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WO2018159180A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018159180A1
WO2018159180A1 PCT/JP2018/002630 JP2018002630W WO2018159180A1 WO 2018159180 A1 WO2018159180 A1 WO 2018159180A1 JP 2018002630 W JP2018002630 W JP 2018002630W WO 2018159180 A1 WO2018159180 A1 WO 2018159180A1
Authority
WO
WIPO (PCT)
Prior art keywords
secondary battery
current collector
negative electrode
gasket
lid
Prior art date
Application number
PCT/JP2018/002630
Other languages
French (fr)
Japanese (ja)
Inventor
伸芳 田中
池田　幸太郎
佐藤　豊
和昭 浦野
博昭 江川
佳佑 澤田
Original Assignee
日立オートモティブシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to JP2019502513A priority Critical patent/JP6892495B2/en
Publication of WO2018159180A1 publication Critical patent/WO2018159180A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • a prismatic secondary battery houses a power storage element, a current collector connected to the power storage element, the power storage element and the current collector, and is provided with an opening.
  • a battery container, a lid that closes the opening of the battery container, the external terminal is disposed, and a connection terminal that connects the external terminal and the current collector plate, and has a gasket around the axis of the connection terminal
  • the gasket is provided with a pair of narrow portions
  • the lid or the current collector plate is provided with a tapered portion disposed between the pair of narrow portions.
  • the present application in addition to the prior art sealing technique in which the gasket is pressed in the caulking direction by the unevenness provided on the lid or flange portion, the present application further applies a pressing force due to the flaking of the gasket to the shaft portion of the connection terminal.
  • the function of the shaft seal can be obtained.
  • longer-term sealing performance can be ensured than before.
  • the wound electrode group 3 (see FIG. 2) is built in the battery can 1, and the opening 1 a of the battery can 1 is sealed by the lid 6.
  • the lid 6 has a substantially rectangular flat plate shape, and is welded so as to close the opening 1 a of the battery can 1 to seal the battery can 1.
  • the lid 6 is provided with a positive electrode output portion 14 fixed to the lid 6 by an insulating member 5 by insert molding and a negative electrode output portion 12.
  • the wound electrode group 3 is charged via the positive electrode output unit 14 and the negative electrode output unit 12, and power is supplied to the external load.
  • the lid 6 is integrally provided with a gas discharge valve 10, and when the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. Thereby, the safety of the prismatic secondary battery 100 is ensured.
  • the battery can 1 of the rectangular secondary battery 100 includes a rectangular bottom surface 1d, a wide surface 1b rising from a pair of long sides of the bottom surface 1d, a narrow surface 1c rising from a pair of short sides of the bottom surface 1d, and the wide surface 1b. And an opening 1a opened upward at the upper end of the narrow surface 1c.
  • a wound electrode group 3 is accommodated in the battery can 1 via an insulating protective film 2.
  • the wound electrode group 3 is formed by winding a strip-like electrode into a flat shape, and is formed continuously between a pair of curved portions facing each other and having a semicircular cross section, and the pair of curved portions. And a flat portion.
  • the wound electrode group 3 is inserted into the battery can 1 from one curved portion side so that the winding axis direction is along the lateral width direction of the battery can 1 and faces the bottom surface 1d, and the other curved portion side is an opening. It is arranged on the 1a side.
  • a gasket 5 and an insulating plate 7 are provided on the battery lid 6. It has been. Moreover, after injecting electrolyte solution into the battery can 1 from the injection hole 9, the injection stopper 11 is joined to the battery cover 6 by laser welding to seal the injection hole 9, and the flat wound secondary battery 100 is sealed.
  • the battery lid 6 is provided with a liquid injection hole 9 for injecting an electrolytic solution into the battery container.
  • the liquid injection hole 9 is an injection stopper after the electrolytic solution is injected into the battery container. 11 is sealed.
  • a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate is used. Can be applied.
  • the positive external terminal 14 and the negative external terminal 12 have a weld joint that is welded to a bus bar or the like.
  • the welded joint has a flat surface disposed above the gasket 5 and parallel to the outer surface of the battery lid 6, and a bus bar or the like is brought into contact with the flat surface to be welded. .
  • the insulating protective film 2 is made of, for example, a single sheet made of synthetic resin such as PP (polypropylene) or a plurality of film members, and is parallel to the flat surface of the wound electrode group 3 and orthogonal to the winding axis direction. It has a length that can be wound around the direction as the winding center.
  • FIG. 2 is an exploded perspective view showing a state in which a part of the wound electrode group is developed.
  • the wound electrode group 3 is configured by winding a negative electrode 32 and a positive electrode 34 in a flat shape with separators 33 and 35 interposed therebetween.
  • the outermost electrode is the negative electrode 32, and separators 33 and 35 are wound further outside.
  • the separators 33 and 35 have a role of insulating between the positive electrode 34 and the negative electrode 32.
  • the portion where the negative electrode mixture layer 32b of the negative electrode 32 is applied is larger in the width direction than the portion of the positive electrode 34 where the positive electrode mixture layer 34b is applied, so that the portion where the positive electrode mixture layer 34b is applied is
  • the negative electrode mixture layer 32b is always sandwiched between the coated portions.
  • the positive foil exposed portion 34c and the negative foil exposed portion 32c are bundled at a plane portion and connected by welding or the like.
  • the separators 33 and 35 are wider than the portion where the negative electrode mixture layer 32b is applied in the width direction, but are wound at positions where the metal foil surface at the end is exposed at the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c. Therefore, it does not hinder bundle welding.
  • the positive electrode 34 has a positive electrode active material mixture on both sides of a positive electrode foil that is a positive electrode current collector, and a positive electrode foil exposed portion where no positive electrode active material mixture is applied to one end in the width direction of the positive electrode foil 34c is provided.
  • the negative electrode 32 has a negative electrode active material mixture on both sides of a negative electrode foil that is a negative electrode current collector, and a negative electrode foil exposed portion where no negative electrode active material mixture is applied to the other end in the width direction of the negative electrode foil 32c is provided.
  • the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are regions where the metal surface of the electrode foil is exposed, and are wound so as to be disposed on one side and the other side in the winding axis direction.
  • negative electrode 32 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) is added as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and N as a dispersion solvent.
  • NMP kneading methylpyrrolidone
  • amorphous carbon is used as the negative electrode active material, but the present invention is not limited to this.
  • Natural graphite capable of inserting and removing lithium ions and various artificial graphite materials Carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or composite materials thereof may be used. It is not limited.
  • the positive electrode 34 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder are added to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material.
  • a positive electrode mixture was prepared by adding and kneading NMP as a dispersion solvent. This positive electrode mixture was applied to both surfaces of an aluminum foil (positive electrode foil) having a thickness of 20 ⁇ m leaving a welded portion (positive electrode uncoated portion). Thereafter, a positive electrode 31 having a thickness of 90 ⁇ m in the thickness of the positive electrode active material coating portion not including an aluminum foil was obtained through drying, pressing, and cutting processes.
  • lithium manganate is used as the positive electrode active material
  • other lithium manganate having a spinel crystal structure or a lithium manganese composite oxide or layered in which a part is substituted or doped with a metal element A lithium cobalt oxide or lithium titanate having a crystal structure, or a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used.
  • PVDF polytetrafluoroethylene
  • polyethylene polyethylene
  • polystyrene polybutadiene
  • butyl rubber nitrile rubber
  • styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof.
  • PTFE polytetrafluoroethylene
  • polystyrene polystyrene
  • polybutadiene butyl rubber
  • nitrile rubber styrene
  • styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chlor
  • the shaft core for example, a structure obtained by winding a resin sheet having higher bending rigidity than any of the positive electrode foil, the negative electrode foil, and the separators 33 and 35 can be used.
  • FIG. 3 shows a schematic cross-sectional view during caulking in the first embodiment.
  • this embodiment demonstrates the negative electrode side as a representative, naturally this embodiment can be applied even if it is a positive electrode side.
  • FIG. 3 shows a state in which the parts before caulking are overlapped with each other in FIG. 3A, a state in which the gasket 5 is pressed with the compression load 110 in the overlapped state in FIG.
  • FIG. 3C shows a state in which the end of the connection terminal 12a is expanded in a taper shape while being pressed in the state shown in FIG. 3C. It is FIG.3 (d) of the state crimped.
  • the gasket 5 is provided with a narrow portion 55a formed by the battery cover protrusion 6a, and a narrow portion 55b formed by the insulating plate protrusion 7aa, the connection terminal 12a, and the battery cover 6. It is done.
  • connection terminal 12a In the state where the compressive load 110 shown in FIG. 3 (b) is applied, as shown in FIG. 3 (c), the end of the connection terminal 12a is pushed into a tapered shape by, for example, a 90 ° tapered punch not shown. By spreading, a negative electrode connecting portion temporary caulking 12aa is formed at the end of the connecting terminal 12a, and the gasket 5a is held in a compressed state.
  • the negative electrode connection terminal temporary caulking 12aa shown in FIG. 3C is caulked to the negative electrode connecting portion 12aaa which is the target shape by using, for example, a dome-shaped punch (not shown).
  • Gasket pool a part 5a generates surface pressure on the contact surface with connection terminal 12a and the contact surface with battery cover protrusion 6a in a compressed state, but battery cover taper part 6b is the axis of negative electrode connection part 12a.
  • the battery lid taper portion compressive load 110d is formed in a taper angle that enables the load to be generated.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
  • the protrusion part 6a may be arrange
  • the electricity storage element (3), the current collector plate (24, 44) connected to the electricity storage element (3), the electricity storage element (3) and the current collector plate (24, 44) are accommodated,
  • the lid (6) is provided with a tapered portion (6b) disposed between the pair of narrow portions.
  • the gasket can be gathered in a pair of narrow portions and the meat can be pressed against the connection terminals (12a, 14a), so that the seal at the shaft portion can be realized for a long time. be able to. Therefore, leakage from the connection terminals 12a and 14a due to a decrease in sealing performance can be eliminated.
  • the tapered portion (6b) is provided on the lid (6) side, and at a position corresponding to the narrow portion (55a) on one side of the pair of narrow portions (55a, 55b). A projection (6a) protruding from the lid (6) is formed. In the present embodiment, the protrusion (6a) is provided apart from the tapered portion (6b).
  • Example 2 differs from Example 1 in that the end on the external terminal side of the taper portion 6b of the battery lid 6 forms the end of an opening through which the connection terminal 12a of the battery lid 6 is inserted ( In Example 1, there was a flat portion connected from the tapered portion 6b.)
  • FIG. 4 shows a schematic cross-sectional view after caulking in the second embodiment. Similarly to Example 1, a caulking process is performed in which the negative electrode connection portion temporary caulking 12aa is formed and the negative electrode connection portion caulking 12aa is finally formed in a state where the gasket 5 is pressed with the compression load 110 from the state where the components are overlapped.
  • the gasket pool a portion 5a generates a surface pressure on the contact surface with the connection terminal 12a and the contact surface with the battery lid protrusion 6a in a compressed state.
  • the battery lid taper portion 6b The battery cover taper portion compressive load 110d is formed at a taper angle that enables the negative electrode connection portion 12a to be axially oriented.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
  • the end of the tapered portion (6b) is formed at a position corresponding to the narrow portion (55b) on the other side of the pair of narrow portions (55a, 55b). To do. By adopting such a configuration, the gasket puddle a portion 5a can be pushed in a wider area, so that the reliability becomes higher.
  • Example 3 Next, Example 3 will be described.
  • the third embodiment is different from the first embodiment in that the tapered portion 6b of the battery lid 6 and the protruding portion 6a of the battery lid 6 are provided continuously.
  • FIG. 5 shows a schematic cross-sectional view after caulking in the third embodiment.
  • the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
  • the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
  • the protruding portion (6a) is provided continuously from the tapered portion (6b).
  • the gasket 5 can easily flow to the gasket puddle a portion 5a facing the taper portion, and the gasket 5 can be prevented from escaping into the gasket puddle b portion 5b.
  • Example 4 Next, Example 4 will be described.
  • the fourth embodiment differs from the first embodiment in that a protrusion 24a is provided on the current collector plate 24 side.
  • FIG. 7 shows a schematic cross-sectional view after caulking in the fourth embodiment.
  • the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
  • the gasket 5 can flow in the axial direction by pressing the gasket 5 by caulking, and the gasket 5 can be prevented from escaping into the gasket pool b portion 5b. .
  • the effect is acquired similarly to the structure which has the separation
  • the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
  • protrusions protruding from the current collector plates (24, 44) are located at positions corresponding to the narrow portions (55a, 55b) on one side. It is formed. Even if it is a case where it is such a structure, the effect similar to Example 1 can be achieved.
  • Example 5 Next, Example 5 will be described.
  • the fifth embodiment is different from the first embodiment in that the tapered portion 6b is opposed to the protruding plate 24a on the current collecting plate 24 side.
  • FIG. 8 shows a schematic cross-sectional view after caulking in the fifth embodiment.
  • the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
  • the gasket pool portion a 5a Due to the increase in the compression amount by the negative electrode current collector taper portion opposing projection 24b, the gasket pool portion a 5a has a higher contact state with the connection terminal 12a and the battery lid projection 6a than in the first and second embodiments.
  • the contact pressure is generated on the contact surface with the negative electrode current collector plate taper portion protrusion 24b.
  • the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
  • the present embodiment is characterized in that a protrusion is provided on the current collecting plate portion facing the tapered portion.
  • a protrusion is provided on the current collecting plate portion facing the tapered portion.
  • Example 6 differs from the first embodiment in that the shafts of the connection terminals 12a and 14a are thickened on the side of the current collector plate 24 and aim for the same effect as the fifth embodiment.
  • FIG. 9 shows a schematic cross-sectional view after caulking in the sixth embodiment.
  • the negative electrode connecting portion temporary caulking 12aa is formed in a state in which the gasket 5 is pressed with the compressive load 110 from the overlapped parts, and finally the negative electrode connecting portion caulking 12aaa is formed. Perform the process.
  • the battery lid taper portion 6b faces the outer diameter B portion 12ac of the negative electrode connection portion 12a, and the increase in the compression amount due to the fact that the outer diameter A portion 12ab is larger than the other outer diameter A portion 12ab.
  • a compressed state higher than 2 surface pressure is generated on the contact surface with the connection terminal 12a, the contact surface with the battery lid protrusion 6a, and the contact surface with the negative electrode current collector plate protrusion 24a.
  • the battery lid taper portion 6b is formed at a taper angle that allows the battery lid taper portion compression surface pressure 110d to be generated in the direction of the axis of the negative electrode connection portion 12a.
  • the battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression surface pressure 110d for a long time.
  • the examples are briefly summarized above.
  • the present embodiment is characterized in that the diameter (12ac) of the connection terminal facing the tapered portion (6b) is larger than the other diameter (12ab).
  • Examples 1, 2, 3, 4, 5, and 6, only the configuration on the negative electrode side was shown.
  • the present embodiment is not limited to the negative electrode side, and the configuration on which at least one of the positive electrode side and the negative electrode side is applied.
  • the positive electrode side has the same configuration as the negative electrode side.
  • the taper shape was demonstrated to the example in the Example, R shape may be sufficient and it can solve similarly the subject which this application tends to solve.
  • the shaft portions of the connection terminals 12a and 14a opposed to the tapered portion 6b may be provided with irregularities by rolling or cutting. With such a configuration, longer-term sealing performance can be improved.
  • the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

It is possible to obtain a shaft sealing function by causing a pressing force from the thick part of a gasket to be act on a shaft part of a connection terminal, and due to this configuration, provided is a rectangular secondary battery capable of maintaining secure sealing for a longer period of time than conventional batteries. A rectangular secondary battery according to one embodiment of the present invention includes: an electricity storage element; a current collector connected to the electricity storage element; a battery casing that stores the electricity storage element and the current collector and that is provided with an opening; a lid that closes the opening in the battery casing and includes an external terminal disposed thereon; and a connection terminal that connects the external terminal and the current collector. A gasket is provided around the axis of the connection terminal, the gasket is provided with a pair of width-narrowing sections, and the lid or the current collector is provided with a tapered section disposed between the pair of width-narrowing sections.

Description

二次電池Secondary battery
　本発明は、電池蓋の突起部と絶縁板によって肉だまりを形成したガスケットの圧縮によって発生した押圧力を、電池蓋のテーパー部によって接続端子の軸方向に安定して作用させることで軸シールの機能を得る角形二次電池に関する。 According to the present invention, the pressing force generated by the compression of the gasket formed by the protrusions of the battery cover and the insulating plate is stably acted in the axial direction of the connection terminal by the taper part of the battery cover. The present invention relates to a prismatic secondary battery that obtains a function.
　従来例として、接続端子の軸部を垂直方向にかしめることで軸部を拡径し、他部材の軸部貫通孔との間でガスケットを押圧することで軸方向のシールを実現する特許が特許文献１に開示されている。 As a conventional example, there is a patent that realizes a seal in the axial direction by expanding the diameter of the shaft portion by caulking the shaft portion of the connection terminal in the vertical direction and pressing the gasket between the shaft portion through-holes of other members. It is disclosed in Patent Document 1.
特開２００９-７６３９４号公報JP 2009-76394 A
　先行技術では、軸部の拡径によって押圧（圧縮）されたガスケットの流動（肉逃げ）を堰き止める為の構造（部位）が無いことから、ガスケットの肉逃げが生じ、振動やクリープなどで経時的なシール性の低下が懸念される。また、特に集電板、外部端子、接続端子を３つの部品で作った場合には、接続端子を経由して電解液が染み出す恐れがある。 In the prior art, there is no structure (part) for blocking the flow (thickness escape) of the gasket pressed (compressed) by expanding the diameter of the shaft. There is a concern that the sealing performance will be lowered. In particular, when the current collector plate, the external terminal, and the connection terminal are made of three parts, there is a risk that the electrolyte may ooze out through the connection terminal.
　本発明は、上記の点に鑑みてなされたものであり、その目的とするところは、従来技術の、蓋やフランジ部分に設けた凹凸によってかしめ方向にガスケットを押圧するシール技術に加え、本願は更に接続端子の軸部へガスケットの肉だまりによる押圧力を作用させることで軸シールの機能を得ることが可能である。これにより、従来よりも長期的なシール性の担保が可能となる角形二次電池を提供することである。 The present invention has been made in view of the above points, and the object of the present invention is in addition to the conventional sealing technology in which a gasket is pressed in the caulking direction by unevenness provided on a lid or a flange portion. Furthermore, it is possible to obtain the function of the shaft seal by applying a pressing force due to the accumulation of the gasket to the shaft portion of the connection terminal. Accordingly, it is an object of the present invention to provide a prismatic secondary battery that can ensure longer-term sealing performance than before.
　上記課題を解決するために本発明の一態様に係る角形二次電池は、蓄電要素と、蓄電要素と接続される集電板と、蓄電要素および集電板とを収納し、開口が設けられた電池容器と、電池容器の開口を塞ぎ、外部端子が配置された蓋と、外部端子と前記集電板とを接続する接続端子と、を備え接続端子の軸の周りにはガスケットを有し、ガスケットには一対の幅狭部が設けられ、蓋又は集電板には、前記一対の幅狭部間に配置されたテーパー部が設けられることを特徴とする。 In order to solve the above problems, a prismatic secondary battery according to one embodiment of the present invention houses a power storage element, a current collector connected to the power storage element, the power storage element and the current collector, and is provided with an opening. A battery container, a lid that closes the opening of the battery container, the external terminal is disposed, and a connection terminal that connects the external terminal and the current collector plate, and has a gasket around the axis of the connection terminal The gasket is provided with a pair of narrow portions, and the lid or the current collector plate is provided with a tapered portion disposed between the pair of narrow portions.
　本発明によれば、従来技術の、蓋やフランジ部分に設けた凹凸によってかしめ方向にガスケットを押圧するシール技術に加え、本願は更に接続端子の軸部へガスケットの肉ダマリによる押圧力を作用させることで軸シールの機能を得ることが可能である。これにより、従来よりも長期的なシール性の担保が可能となる。なお、上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 According to the present invention, in addition to the prior art sealing technique in which the gasket is pressed in the caulking direction by the unevenness provided on the lid or flange portion, the present application further applies a pressing force due to the flaking of the gasket to the shaft portion of the connection terminal. Thus, the function of the shaft seal can be obtained. As a result, longer-term sealing performance can be ensured than before. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
角形二次電池の分解斜視図Exploded perspective view of prismatic secondary battery 捲回電極群の分解斜視図Exploded perspective view of wound electrode group 実施例１の押圧前の模式断面図Schematic sectional view of Example 1 before pressing 実施例１の押圧中の模式断面図Schematic sectional view during pressing in Example 1 実施例１のかしめ中の模式断面図Schematic sectional view during caulking of Example 1 実施例１のかしめ後の模式断面図Schematic sectional view after caulking of Example 1 実施例２の模式断面図Schematic sectional view of Example 2 実施例３の模式断面図Schematic sectional view of Example 3 実施例１の変形例の模式断面図Schematic sectional view of a modification of the first embodiment 実施例４の模式断面図Schematic sectional view of Example 4 実施例５の模式断面図Schematic sectional view of Example 5 実施例６の模式断面図Schematic sectional view of Example 6
　以下、本発明の実施例について図面を用いて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
≪実施例１≫
　図１は、角形二次電池の分解斜視図である。
　角形二次電池１００は、電池缶１および蓋６を備える。電池缶１と蓋６は、例えばアルミニウム合金などの金属材料からなり、深絞り加工及びプレス加工を施すことによって形成される。 Example 1
FIG. 1 is an exploded perspective view of a prismatic secondary battery.
The prismatic secondary battery 100 includes a battery can 1 and a lid 6. The battery can 1 and the lid 6 are made of a metal material such as an aluminum alloy, for example, and are formed by deep drawing and pressing.
　電池缶１内には、捲回電極群３（図２を参照）が内蔵され、電池缶１の開口部１ａが蓋６によって封口されている。蓋６は略矩形平板状であって、電池缶１の開口部１ａを塞ぐように溶接されて電池缶１が封止されている。蓋６には、インサート成形により絶縁部材５によって蓋６に固定された正極出力部１４と、負極出力部１２が設けられている。正極出力部１４と負極出力部１２を介して捲回電極群３に充電され、また外部負荷に電力が供給される。蓋６には、ガス排出弁１０が一体的に設けられ、電池容器内の圧力が上昇すると、ガス排出弁１０が開いて内部からガスが排出され、電池容器内の圧力が低減される。これによって、角形二次電池１００の安全性が確保される。 The wound electrode group 3 (see FIG. 2) is built in the battery can 1, and the opening 1 a of the battery can 1 is sealed by the lid 6. The lid 6 has a substantially rectangular flat plate shape, and is welded so as to close the opening 1 a of the battery can 1 to seal the battery can 1. The lid 6 is provided with a positive electrode output portion 14 fixed to the lid 6 by an insulating member 5 by insert molding and a negative electrode output portion 12. The wound electrode group 3 is charged via the positive electrode output unit 14 and the negative electrode output unit 12, and power is supplied to the external load. The lid 6 is integrally provided with a gas discharge valve 10, and when the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. Thereby, the safety of the prismatic secondary battery 100 is ensured.
　角形二次電池１００の電池缶１は、長方形の底面１ｄと、底面１ｄの一対の長辺から立ち上がる幅広面１ｂと、底面１ｄの一対の短辺から立ち上がる幅狭面１ｃと、これら幅広面１ｂ及び幅狭面１ｃの上端で上方に向かって開放された開口部１ａとを有している。電池缶１内には、絶縁保護フィルム２を介して捲回電極群３が収容されている。 The battery can 1 of the rectangular secondary battery 100 includes a rectangular bottom surface 1d, a wide surface 1b rising from a pair of long sides of the bottom surface 1d, a narrow surface 1c rising from a pair of short sides of the bottom surface 1d, and the wide surface 1b. And an opening 1a opened upward at the upper end of the narrow surface 1c. A wound electrode group 3 is accommodated in the battery can 1 via an insulating protective film 2.
　捲回電極群３は、帯状の電極が扁平形状に捲回されて構成されており、断面半円形状の互いに対向する一対の湾曲部と、これら一対の湾曲部の間に連続して形成される平面部とを有している。捲回電極群３は、捲回軸方向が電池缶１の横幅方向に沿うように、一方の湾曲部側から電池缶１内に挿入されて底面１ｄと対向し、他方の湾曲部側が開口部１ａ側に配置される。 The wound electrode group 3 is formed by winding a strip-like electrode into a flat shape, and is formed continuously between a pair of curved portions facing each other and having a semicircular cross section, and the pair of curved portions. And a flat portion. The wound electrode group 3 is inserted into the battery can 1 from one curved portion side so that the winding axis direction is along the lateral width direction of the battery can 1 and faces the bottom surface 1d, and the other curved portion side is an opening. It is arranged on the 1a side.
　捲回電極群３の正極箔露出部３４ｃは、正極集電板４４を介して蓋６に設けられた正極出力部１４と電気的に接続されている。また、捲回電極群３の負極箔露出部３２ｃは、負極集電板２４を介して蓋６に設けられた負極出力部１２と電気的に接続されている。これにより、正極集電板４４および負極集電板２４を介して捲回電極群３から外部負荷へ電力が供給され、正極集電板４４および負極集電板２４を介して捲回電極群３へ外部発電電力が供給され充電される。 The positive electrode foil exposed portion 34 c of the wound electrode group 3 is electrically connected to the positive electrode output portion 14 provided on the lid 6 via the positive electrode current collector plate 44. Further, the negative electrode foil exposed portion 32 c of the wound electrode group 3 is electrically connected to the negative electrode output portion 12 provided on the lid 6 via the negative electrode current collector plate 24. As a result, power is supplied from the wound electrode group 3 to the external load via the positive current collector plate 44 and the negative current collector plate 24, and the wound electrode group 3 is provided via the positive current collector plate 44 and the negative current collector plate 24. Externally generated power is supplied to and charged.
　正極集電板４４と負極集電板２４、及び、正極外部端子１４と負極外部端子１２を、それぞれ電池蓋６から電気的に絶縁するために、ガスケット５および絶縁板７が電池蓋６に設けられている。また、注液口９から電池缶１内に電解液を注入した後、電池蓋６に注液栓１１をレーザ溶接により接合して注液口９を封止し、扁平捲回形二次電池１００を密閉する。 In order to electrically insulate the positive electrode current collector plate 44 and the negative electrode current collector plate 24, and the positive electrode external terminal 14 and the negative electrode external terminal 12 from the battery lid 6, a gasket 5 and an insulating plate 7 are provided on the battery lid 6. It has been. Moreover, after injecting electrolyte solution into the battery can 1 from the injection hole 9, the injection stopper 11 is joined to the battery cover 6 by laser welding to seal the injection hole 9, and the flat wound secondary battery 100 is sealed.
　ここで、正極集電板４４の形成素材としては、例えばアルミニウム合金が挙げられ、負極集電板２４の形成素材としては、例えば銅合金が挙げられる。また、絶縁部材５の形成素材としては、例えばポリブチレンテレフタレートやポリフェニレンサルファイド、ペルフルオロアルコキシフッ素樹脂等の絶縁性を有する樹脂材が挙げられる。 Here, examples of the material for forming the positive electrode current collector plate 44 include an aluminum alloy, and examples of the material for forming the negative electrode current collector plate 24 include a copper alloy. Examples of the material for forming the insulating member 5 include resin materials having insulation properties such as polybutylene terephthalate, polyphenylene sulfide, and perfluoroalkoxy fluororesin.
　また、電池蓋６には、電池容器内に電解液を注入するための注液孔９が穿設されており、この注液孔９は、電解液を電池容器内に注入した後に注液栓１１によって封止される。ここで、電池容器内に注入される電解液としては、例えばエチレンカーボネート等の炭酸エステル系の有機溶媒に６フッ化リン酸リチウム（ＬｉＰＦ６）等のリチウム塩が溶解された非水電解液を適用することができる。 Further, the battery lid 6 is provided with a liquid injection hole 9 for injecting an electrolytic solution into the battery container. The liquid injection hole 9 is an injection stopper after the electrolytic solution is injected into the battery container. 11 is sealed. Here, as the electrolytic solution injected into the battery container, for example, a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate is used. Can be applied.
　正極外部端子１４、負極外部端子１２は、バスバー等に溶接接合される溶接接合部を有している。溶接接合部は、ガスケット５よりも上方で電池蓋６の外面と平行に配置される平坦面を有しており、かかる平坦面にバスバー等が接面されて溶接接合されるようになっている。 The positive external terminal 14 and the negative external terminal 12 have a weld joint that is welded to a bus bar or the like. The welded joint has a flat surface disposed above the gasket 5 and parallel to the outer surface of the battery lid 6, and a bus bar or the like is brought into contact with the flat surface to be welded. .
　正極集電板４４、負極集電板２４は、電池缶１の幅広面に沿って底面側に向かって延出し、捲回電極群３の正極箔露出部３４ｃ、負極箔露出部３２ｃに対向して重ね合わされた状態で接続される正極側接続端部４２、負極側接続端部２２を有している。
　捲回電極群３の扁平面に沿う方向でかつ捲回電極群３の捲回軸方向に直交する方向を中心軸方向として捲回電極群３の周囲には絶縁保護フィルム２が巻き付けられている。絶縁保護フィルム２は、例えばＰＰ（ポリプロピレン）などの合成樹脂製の一枚のシートまたは複数のフィルム部材からなり、捲回電極群３の扁平面と平行な方向でかつ捲回軸方向に直交する方向を巻き付け中心として巻き付けることができる長さを有している。 The positive electrode current collector plate 44 and the negative electrode current collector plate 24 extend toward the bottom surface along the wide surface of the battery can 1, and face the positive electrode foil exposed portion 34 c and the negative electrode foil exposed portion 32 c of the wound electrode group 3. The positive electrode side connection end portion 42 and the negative electrode side connection end portion 22 which are connected in a state of being overlapped with each other.
The insulating protective film 2 is wound around the wound electrode group 3 with the direction along the flat plane of the wound electrode group 3 and the direction orthogonal to the wound axis direction of the wound electrode group 3 as the central axis direction. . The insulating protective film 2 is made of, for example, a single sheet made of synthetic resin such as PP (polypropylene) or a plurality of film members, and is parallel to the flat surface of the wound electrode group 3 and orthogonal to the winding axis direction. It has a length that can be wound around the direction as the winding center.
　図２は、捲回電極群の一部を展開した状態を示す分解斜視図である。
　捲回電極群３は、負極電極３２と正極電極３４を間にセパレータ３３、３５を介して扁平状に捲回することによって構成されている。捲回電極群３は、最外周の電極が負極電極３２であり、さらにその外側にセパレータ３３、３５が捲回される。セパレータ３３、３５は、正極電極３４と負極電極３２との間を絶縁する役割を有している。 FIG. 2 is an exploded perspective view showing a state in which a part of the wound electrode group is developed.
The wound electrode group 3 is configured by winding a negative electrode 32 and a positive electrode 34 in a flat shape with separators 33 and 35 interposed therebetween. In the wound electrode group 3, the outermost electrode is the negative electrode 32, and separators 33 and 35 are wound further outside. The separators 33 and 35 have a role of insulating between the positive electrode 34 and the negative electrode 32.
　負極電極３２の負極合剤層３２ｂが塗布された部分は、正極電極３４の正極合剤層３４ｂが塗布された部分よりも幅方向に大きく、これにより正極合剤層３４ｂが塗布された部分は、必ず負極合剤層３２ｂが塗布された部分に挟まれるように構成されている。正極箔露出部３４ｃ、負極箔露出部３２ｃは、平面部分で束ねられて溶接等により接続される。尚、セパレータ３３、３５は幅方向で負極合剤層３２ｂが塗布された部分よりも広いが、正極箔露出部３４ｃ、負極箔露出部３２ｃで端部の金属箔面が露出する位置に捲回されるため、束ねて溶接する場合の支障にはならない。 The portion where the negative electrode mixture layer 32b of the negative electrode 32 is applied is larger in the width direction than the portion of the positive electrode 34 where the positive electrode mixture layer 34b is applied, so that the portion where the positive electrode mixture layer 34b is applied is The negative electrode mixture layer 32b is always sandwiched between the coated portions. The positive foil exposed portion 34c and the negative foil exposed portion 32c are bundled at a plane portion and connected by welding or the like. The separators 33 and 35 are wider than the portion where the negative electrode mixture layer 32b is applied in the width direction, but are wound at positions where the metal foil surface at the end is exposed at the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c. Therefore, it does not hinder bundle welding.
　正極電極３４は、正極集電体である正極箔の両面に正極活物質合剤を有し、正極箔の幅方向一方側の端部には、正極活物質合剤を塗布しない正極箔露出部３４ｃが設けられている。負極電極３２は、負極集電体である負極箔の両面に負極活物質合剤を有し、負極箔の幅方向他方側の端部には、負極活物質合剤を塗布しない負極箔露出部３２ｃが設けられている。正極箔露出部３４ｃと負極箔露出部３２ｃは、電極箔の金属面が露出した領域であり、捲回軸方向の一方側と他方側の位置に配置されるように捲回される。 The positive electrode 34 has a positive electrode active material mixture on both sides of a positive electrode foil that is a positive electrode current collector, and a positive electrode foil exposed portion where no positive electrode active material mixture is applied to one end in the width direction of the positive electrode foil 34c is provided. The negative electrode 32 has a negative electrode active material mixture on both sides of a negative electrode foil that is a negative electrode current collector, and a negative electrode foil exposed portion where no negative electrode active material mixture is applied to the other end in the width direction of the negative electrode foil 32c is provided. The positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are regions where the metal surface of the electrode foil is exposed, and are wound so as to be disposed on one side and the other side in the winding axis direction.
　負極電極３２に関しては、負極活物質として非晶質炭素粉末１００重量部に対して、結着剤として１０重量部のポリフッ化ビニリデン（以下、ＰＶＤＦという。）を添加し、これに分散溶媒としてＮ－メチルピロリドン（以下、ＮＭＰという。）を添加、混練した負極合剤を作製した。この負極合剤を厚さ１０μｍの銅箔（負極箔）の両面に溶接部（負極未塗工部）を残して塗布した。その後、乾燥、プレス、裁断工程を経て、銅箔を含まない負極活物質塗布部厚さ７０μｍの負極電極３２を得た。 Regarding the negative electrode 32, 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) is added as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and N as a dispersion solvent. Negative electrode mixture prepared by adding and kneading methylpyrrolidone (hereinafter referred to as NMP) was prepared. This negative electrode mixture was applied to both surfaces of a 10 μm thick copper foil (negative electrode foil) leaving a welded portion (negative electrode uncoated portion). Then, the negative electrode 32 with a negative electrode active material application part thickness of 70 micrometers which does not contain copper foil was obtained through drying, a press, and a cutting process.
　尚、本実施形態では、負極活物質に非晶質炭素を用いる場合について例示したが、これに限定されるものではなく、リチウムイオンを挿入、脱離可能な天然黒鉛や、人造の各種黒鉛材、コークスなどの炭素質材料やＳｉやＳｎなどの化合物（例えば、ＳｉＯ、ＴｉＳｉ２等）、またはそれの複合材料でもよく、その粒子形状においても、鱗片状、球状、繊維状、塊状等、特に制限されるものではない。 In this embodiment, the case where amorphous carbon is used as the negative electrode active material is exemplified, but the present invention is not limited to this. Natural graphite capable of inserting and removing lithium ions and various artificial graphite materials , Carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or composite materials thereof may be used. It is not limited.
　正極電極３４に関しては、正極活物質としてマンガン酸リチウム（化学式ＬｉＭｎ２Ｏ４）１００重量部に対し、導電材として１０重量部の鱗片状黒鉛と結着剤として１０重量部のＰＶＤＦとを添加し、これに分散溶媒としてＮＭＰを添加、混練した正極合剤を作製した。この正極合剤を厚さ２０μｍのアルミニウム箔（正極箔）の両面に溶接部（正極未塗工部）を残して塗布した。その後、乾燥、プレス、裁断工程を経て、アルミニウム箔を含まない正極活物質塗布部厚さ９０μｍの正極電極３１を得た。 Regarding the positive electrode 34, 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder are added to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. A positive electrode mixture was prepared by adding and kneading NMP as a dispersion solvent. This positive electrode mixture was applied to both surfaces of an aluminum foil (positive electrode foil) having a thickness of 20 μm leaving a welded portion (positive electrode uncoated portion). Thereafter, a positive electrode 31 having a thickness of 90 μm in the thickness of the positive electrode active material coating portion not including an aluminum foil was obtained through drying, pressing, and cutting processes.
　また、本実施形態では、正極活物質にマンガン酸リチウムを用いる場合について例示したが、スピネル結晶構造を有する他のマンガン酸リチウムや一部を金属元素で置換又はドープしたリチウムマンガン複合酸化物や層状結晶構造を有すコバルト酸リチウムやチタン酸リチウムやこれらの一部を金属元素で置換またはドープしたリチウム-金属複合酸化物を用いるようにしてもよい。 Further, in the present embodiment, the case where lithium manganate is used as the positive electrode active material is exemplified, but other lithium manganate having a spinel crystal structure or a lithium manganese composite oxide or layered in which a part is substituted or doped with a metal element A lithium cobalt oxide or lithium titanate having a crystal structure, or a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used.
　また、本実施形態では、正極電極、負極電極における塗工部の結着剤としてＰＶＤＦを用いる場合について例示したが、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエチレン、ポリスチレン、ポリブタジエン、ブチルゴム、ニトリルゴム、スチレンブタジエンゴム、多硫化ゴム、ニトロセルロース、シアノエチルセルロース、各種ラテックス、アクリロニトリル、フッ化ビニル、フッ化ビニリデン、フッ化プロピレン、フッ化クロロプレン、アクリル系樹脂などの重合体およびこれらの混合体などを用いることができる。 Moreover, in this embodiment, although the case where PVDF was used as a binder of the coating part in a positive electrode and a negative electrode was illustrated, polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof. Can do.
　また、軸芯としては例えば、正極箔、負極箔、セパレータ３３、３５のいずれよりも曲げ剛性の高い樹脂シートを捲回して構成したものを用いることができる。 Further, as the shaft core, for example, a structure obtained by winding a resin sheet having higher bending rigidity than any of the positive electrode foil, the negative electrode foil, and the separators 33 and 35 can be used.
　図３は、実施例１におけるかしめ時の模式断面図を示している。なお、本実施形態では代表として負極側について説明するが、当然正極側であったとしても本実施形態を適用することは可能である。 FIG. 3 shows a schematic cross-sectional view during caulking in the first embodiment. In addition, although this embodiment demonstrates the negative electrode side as a representative, naturally this embodiment can be applied even if it is a positive electrode side.
　図３に示す模式断面図は、かしめ前の部品を重ね合わせた状態を図３（ａ）、重ね合わせた状態でガスケット５を圧縮荷重１１０で押圧した状態を図３（ｂ）、圧縮荷重１１０で押圧した状態で接続端子１２ａの端部をテーパー状に押し広げた状態の図３（ｃ）、テーパー状に押し広げた負極接続部仮かしめ１２ａａを目的の形状である負極接続部かしめ１２ａａａにかしめ成形した状態の図３（ｄ）である。このような構造にすることによって、ガスケット５には電池蓋突起部６ａによって作られる幅狭部５５ａと、絶縁板突起部７ａａと接続端子１２ａと電池蓋６とで作られる幅狭部５５ｂが設けられる。 The schematic cross-sectional view shown in FIG. 3 shows a state in which the parts before caulking are overlapped with each other in FIG. 3A, a state in which the gasket 5 is pressed with the compression load 110 in the overlapped state in FIG. FIG. 3C shows a state in which the end of the connection terminal 12a is expanded in a taper shape while being pressed in the state shown in FIG. 3C. It is FIG.3 (d) of the state crimped. By adopting such a structure, the gasket 5 is provided with a narrow portion 55a formed by the battery cover protrusion 6a, and a narrow portion 55b formed by the insulating plate protrusion 7aa, the connection terminal 12a, and the battery cover 6. It is done.
　図３（ａ）に示す電池蓋突起部６ａと絶縁板突起部７ａａが、図３（ｂ）に示す状態で、ガスケット５の対向する位置において、それぞれ、電池蓋突起部圧縮荷重１１０ｂと絶縁板突起部圧縮荷重１１０ａを発生させる。 When the battery cover protrusion 6a and the insulating plate protrusion 7aa shown in FIG. 3 (a) are in the state shown in FIG. The protrusion compressive load 110a is generated.
　図３（ｂ）に示す圧縮荷重１１０が加わっている状態で、図３（ｃ）に表すように、接続端子１２ａの端部を例えば図示しない９０°のテーパー形状のポンチによって、テーパー状に押し広げることで、接続端子１２ａの端部に負極接続部仮かしめ１２ａａを形成しガスケット５ａを圧縮状態で保持させる。 In the state where the compressive load 110 shown in FIG. 3 (b) is applied, as shown in FIG. 3 (c), the end of the connection terminal 12a is pushed into a tapered shape by, for example, a 90 ° tapered punch not shown. By spreading, a negative electrode connecting portion temporary caulking 12aa is formed at the end of the connecting terminal 12a, and the gasket 5a is held in a compressed state.
　図３（ｃ）に示す負極接続端子仮かしめ１２ａａを、図３（ｄ）に示すように、例えば図示しないドーム形状のポンチによって、目的の形状である負極接続部１２ａａａにかしめ成形する。ガスケット肉だまりａ部５ａは圧縮状態で接続端子１２ａとの接触面及び電池蓋突起部６ａとの接触面にて面圧を発生させるが、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパー部圧縮荷重１１０ｄを発生させることを可能とするテーパー角度に成形されている。電池蓋テーパー部６ｂは、該圧縮荷重１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　なお、図６に示すように突起部６ａは、テーパー部６ｂから離間された位置に配置されていてもよい。
　以上、本実施例について簡単にまとめる。本実施例では、蓄電要素（３）と、蓄電要素（３）と接続される集電板（２４、４４）と、蓄電要素（３）および集電板（２４、４４）とを収納し、開口（１ａ）が設けられた電池容器（１）と、電池容器（１）の開口（１ａ）を塞ぎ、外部端子（１２、１４）が配置された蓋と、外部端子（１２、１４）と集電板（２４、４４）とを接続する接続端子（１２ａ、１４ａ）と、を備え、接続端子（１２ａ、１４ａ）の軸の周りにはガスケット（５）を有し、ガスケット（５）には一対の幅狭部（５５ａ、５５ｂ）が設けられ、蓋（６）には、一対の幅狭部間に配置されたテーパー部（６ｂ）が設けられる。このような構造にすることによって、一対の幅狭部にガスケットの肉を集めたうえで、その肉を接続端子（１２ａ、１４ａ）に押圧できるため、軸部でのシールを長期的に実現することができる。したがって、シール性の低下による接続端子１２ａ、１４ａからのリークがなくすことができる。
　また、本実施例では、テーパー部（６ｂ）は蓋（６）側に設けられ、一対の幅狭部（５５ａ、５５ｂ）のうち、一方側の幅狭部（５５ａ）に対応する位置には、蓋（６）から突出した突起部（６ａ）が形成される。
　また、本実施例では、突起部（６ａ）はテーパー部（６ｂ）から離間して設けられる。 As shown in FIG. 3D, the negative electrode connection terminal temporary caulking 12aa shown in FIG. 3C is caulked to the negative electrode connecting portion 12aaa which is the target shape by using, for example, a dome-shaped punch (not shown). Gasket pool a part 5a generates surface pressure on the contact surface with connection terminal 12a and the contact surface with battery cover protrusion 6a in a compressed state, but battery cover taper part 6b is the axis of negative electrode connection part 12a. The battery lid taper portion compressive load 110d is formed in a taper angle that enables the load to be generated. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
In addition, as shown in FIG. 6, the protrusion part 6a may be arrange | positioned in the position spaced apart from the taper part 6b.
The present embodiment will be briefly described above. In the present embodiment, the electricity storage element (3), the current collector plate (24, 44) connected to the electricity storage element (3), the electricity storage element (3) and the current collector plate (24, 44) are accommodated, A battery case (1) provided with an opening (1a), a lid for closing the opening (1a) of the battery case (1) and provided with external terminals (12, 14); and external terminals (12, 14); Connecting terminals (12a, 14a) for connecting the current collector plates (24, 44), and having gaskets (5) around the axes of the connecting terminals (12a, 14a). Is provided with a pair of narrow portions (55a, 55b), and the lid (6) is provided with a tapered portion (6b) disposed between the pair of narrow portions. With such a structure, the gasket can be gathered in a pair of narrow portions and the meat can be pressed against the connection terminals (12a, 14a), so that the seal at the shaft portion can be realized for a long time. be able to. Therefore, leakage from the connection terminals 12a and 14a due to a decrease in sealing performance can be eliminated.
Further, in this embodiment, the tapered portion (6b) is provided on the lid (6) side, and at a position corresponding to the narrow portion (55a) on one side of the pair of narrow portions (55a, 55b). A projection (6a) protruding from the lid (6) is formed.
In the present embodiment, the protrusion (6a) is provided apart from the tapered portion (6b).
　≪実施例２≫
　続いて実施例２について説明する。実施例２が実施例１と異なる点は、電池蓋６のテーパー部６ｂの外部端子側端部が、電池蓋６の接続端子１２ａを挿通する開口部の端部をなしている点である（実施例１ではテーパー部６ｂからつながる平坦部があった。）。
　図４は、実施例２におけるかしめ後の模式断面図を示している。実施例１と同様に、部品を重ね合わせた状態からガスケット５を圧縮荷重１１０で押圧した状態で負極接続部仮かしめ１２ａａを成形、最終的に負極接続部かしめ１２ａａａを成形するかしめ工程を行う。 << Example 2 >>
Next, Example 2 will be described. Example 2 differs from Example 1 in that the end on the external terminal side of the taper portion 6b of the battery lid 6 forms the end of an opening through which the connection terminal 12a of the battery lid 6 is inserted ( In Example 1, there was a flat portion connected from the tapered portion 6b.)
FIG. 4 shows a schematic cross-sectional view after caulking in the second embodiment. Similarly to Example 1, a caulking process is performed in which the negative electrode connection portion temporary caulking 12aa is formed and the negative electrode connection portion caulking 12aa is finally formed in a state where the gasket 5 is pressed with the compression load 110 from the state where the components are overlapped.
　ガスケット肉だまりａ部５ａは圧縮状態で接続端子１２ａとの接触面及び電池蓋突起部６ａとの接触面にて面圧を発生させるが、実施例１と同様に、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパー部圧縮荷重１１０ｄを発生させることを可能とするテーパ角度に成形されている。電池蓋テーパー部６ｂは、該圧縮荷重１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　以上、本実施例についてまとめる。本実施例では、一対の幅狭部（５５ａ、５５ｂ）のうち、他方側の幅狭部（５５ｂ）に対応する位置には、テーパー部（６ｂ）の端部が形成されることを特徴とする。このような構成にすることによって、より広い領域でガスケット肉だまりａ部５ａを押すことができるため、より信頼性が高くなる。 The gasket pool a portion 5a generates a surface pressure on the contact surface with the connection terminal 12a and the contact surface with the battery lid protrusion 6a in a compressed state. As in the first embodiment, the battery lid taper portion 6b The battery cover taper portion compressive load 110d is formed at a taper angle that enables the negative electrode connection portion 12a to be axially oriented. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
The present embodiment is summarized above. In this embodiment, the end of the tapered portion (6b) is formed at a position corresponding to the narrow portion (55b) on the other side of the pair of narrow portions (55a, 55b). To do. By adopting such a configuration, the gasket puddle a portion 5a can be pushed in a wider area, so that the reliability becomes higher.
　≪実施例３≫
　続いて実施例３について説明する。実施例３が実施例１と異なる点は、電池蓋６のテーパー部６ｂと電池蓋６の突起部６ａが連続して設けられている点である。
　図５は、実施例３におけるかしめ後の模式断面図を示している。実施例１及び２と同様に、部品を重ね合わせた状態からガスケット５を圧縮荷重１１０で押圧した状態で負極接続部仮かしめ１２ａａを成形、最終的に負極接続部かしめ１２ａａａを成形するかしめ工程を行う。 Example 3
Next, Example 3 will be described. The third embodiment is different from the first embodiment in that the tapered portion 6b of the battery lid 6 and the protruding portion 6a of the battery lid 6 are provided continuously.
FIG. 5 shows a schematic cross-sectional view after caulking in the third embodiment. In the same manner as in Examples 1 and 2, the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
　本実施例では蓋に設けたテーパー部から連続して突起６ａを設けることで、かしめによるガスケット５の押圧によるガスケット５がテーパー部に面するガスケット肉だまりａ部５ａへ流動し易くなり、且つガスケット肉だまりｂ部５ｂへのガスケット５の肉逃げを防止することが可能となる。実施例１及び２と同様、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパ部圧縮荷重１１０ｄを発生させることを可能とするテーパー角度に成形されている。電池蓋テーパー部６ｂは、該圧縮荷重１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　以上、本実施例についてまとめる。本実施例では、突起部（６ａ）はテーパー部（６ｂ）から連続して設けられることを特徴とする。このような構成にすることによって、ガスケット５がテーパー部に面するガスケット肉だまりａ部５ａへ流動し易くなり、且つガスケット肉だまりｂ部５ｂへのガスケット５の肉逃げを防止することが可能となる。 In this embodiment, by providing the protrusion 6a continuously from the tapered portion provided on the lid, the gasket 5 due to pressing of the gasket 5 by caulking becomes easy to flow to the gasket puddle a portion 5a facing the tapered portion, and the gasket. It becomes possible to prevent the gasket 5 from escaping into the meat b portion 5b. As in the first and second embodiments, the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
The present embodiment is summarized above. In the present embodiment, the protruding portion (6a) is provided continuously from the tapered portion (6b). With such a configuration, the gasket 5 can easily flow to the gasket puddle a portion 5a facing the taper portion, and the gasket 5 can be prevented from escaping into the gasket puddle b portion 5b. Become.
　≪実施例４≫
　続いて実施例４について説明する。実施例４が実施例１と異なる点は、集電板２４側に突起部２４ａを設けた点である。
　図７は、実施例４におけるかしめ後の模式断面図を示している。実施例１及び２と同様に、部品を重ね合わせた状態からガスケット５を圧縮荷重１１０で押圧した状態で負極接続部仮かしめ１２ａａを成形、最終的に負極接続部かしめ１２ａａａを成形するかしめ工程を行う。 Example 4
Next, Example 4 will be described. The fourth embodiment differs from the first embodiment in that a protrusion 24a is provided on the current collector plate 24 side.
FIG. 7 shows a schematic cross-sectional view after caulking in the fourth embodiment. In the same manner as in Examples 1 and 2, the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
　集電板２４に突起２４ａを設けることで、かしめによるガスケット５の押圧によってガスケット５が軸方向へ流動し、且つガスケット肉だまりｂ部５ｂへのガスケット５の肉逃げを防止することが可能となる。また、その効果は図６に示す離間部６ｃを蓋に有した構造と同様に得られる。実施例１及び２と同様、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパ部圧縮荷重１１０ｄを発生させることを可能とするテーパー角度に成形されている。電池蓋テーパー部６ｂは、該圧縮荷重１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　以上、本実施例について簡単にまとめる。本実施例では、一対の幅狭部（５５ａ、５５ｂ）のうち、一方側の幅狭部（５５ａ、５５ｂ）に対応する位置には、集電板（２４、４４）から突出した突起部が形成されることを特徴とする。このような構成とした場合であっても、実施例１と同様の効果を達成することができる。 By providing the current collecting plate 24 with the protrusions 24a, the gasket 5 can flow in the axial direction by pressing the gasket 5 by caulking, and the gasket 5 can be prevented from escaping into the gasket pool b portion 5b. . Moreover, the effect is acquired similarly to the structure which has the separation | spacing part 6c shown in FIG. As in the first and second embodiments, the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
The present embodiment will be briefly described above. In the present embodiment, of the pair of narrow portions (55a, 55b), protrusions protruding from the current collector plates (24, 44) are located at positions corresponding to the narrow portions (55a, 55b) on one side. It is formed. Even if it is a case where it is such a structure, the effect similar to Example 1 can be achieved.
　≪実施例５≫
　続いて実施例５について説明する。実施例５が実施例１と異なる点は、テーパー部６ｂが対向する位置であって、集電板２４側に突起部２４ａを設けた点である。
　図８は、実施例５におけるかしめ後の模式断面図を示している。実施例１及び２と同様に、部品を重ね合わせた状態からガスケット５を圧縮荷重１１０で押圧した状態で負極接続部仮かしめ１２ａａを成形、最終的に負極接続部かしめ１２ａａａを成形するかしめ工程を行う。 Example 5
Next, Example 5 will be described. The fifth embodiment is different from the first embodiment in that the tapered portion 6b is opposed to the protruding plate 24a on the current collecting plate 24 side.
FIG. 8 shows a schematic cross-sectional view after caulking in the fifth embodiment. In the same manner as in Examples 1 and 2, the caulking process of forming the negative electrode connection portion temporary caulking 12aa and finally forming the negative electrode connection portion caulking 12aaa from the state where the components are overlapped with the gasket 5 being pressed with the compression load 110 is performed. Do.
　ガスケット肉だまりａ部５ａは、負極集電板テーパー部対向突起部２４ｂによる圧縮量の増加分によって、実施例１及び２よりも高い圧縮状態で接続端子１２ａとの接触面及び電池蓋突起部６ａとの接触面及び負極集電板テーパー部突起部２４ｂとの接触面で面圧を発生させている。実施例１及び２と同様、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパ部圧縮荷重１１０ｄを発生させることを可能とするテーパー角度に成形されている。電池蓋テーパー部６ｂは、該圧縮荷重１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　以上、本実施例について簡単にまとめる。本実施例では、テーパー部が対向する前記集電板部に突起部が設けられていることを特徴とする。このような構造にすることによって、集電板テーパー部対向突起部による圧縮量の増加分によって、実施例１及び２よりも高い圧縮状態で接続端子の接触面及び電池蓋突起部との接触面及び集電板テーパー部突起部との接触面で面圧を発生させることができ、さらなる長期的なシール性の担保が可能となる。 Due to the increase in the compression amount by the negative electrode current collector taper portion opposing projection 24b, the gasket pool portion a 5a has a higher contact state with the connection terminal 12a and the battery lid projection 6a than in the first and second embodiments. The contact pressure is generated on the contact surface with the negative electrode current collector plate taper portion protrusion 24b. As in the first and second embodiments, the battery lid taper portion 6b is formed at a taper angle that enables the battery lid taper portion compression load 110d to be generated in the direction of the axis of the negative electrode connection portion 12a. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression load 110d for a long time.
The present embodiment will be briefly described above. The present embodiment is characterized in that a protrusion is provided on the current collecting plate portion facing the tapered portion. By adopting such a structure, the contact surface of the connection terminal and the contact surface with the battery lid protrusion in a compressed state higher than those of the first and second embodiments due to the increase in the compression amount by the current collector plate taper portion opposing protrusion. In addition, a surface pressure can be generated at the contact surface with the protruding portion of the current collector plate taper portion, and further long-term sealing can be ensured.
　≪実施例６≫
　続いて実施例６について説明する。実施例６が実施例１と異なる点は、接続端子１２ａ、１４ａの軸部の集電板２４側の部分を太くして実施例５と同様の効果を狙った点である。
　図９は、実施例６におけるかしめ後の模式断面図を示している。実施例１、２及び３と同様に、部品を重ね合わせた状態からガスケット５を圧縮荷重１１０で押圧した状態で負極接続部仮かしめ１２ａａを成形、最終的に負極接続部かしめ１２ａａａを成形するかしめ工程を行う。 Example 6
Next, Example 6 will be described. The sixth embodiment differs from the first embodiment in that the shafts of the connection terminals 12a and 14a are thickened on the side of the current collector plate 24 and aim for the same effect as the fifth embodiment.
FIG. 9 shows a schematic cross-sectional view after caulking in the sixth embodiment. In the same manner as in Examples 1, 2, and 3, the negative electrode connecting portion temporary caulking 12aa is formed in a state in which the gasket 5 is pressed with the compressive load 110 from the overlapped parts, and finally the negative electrode connecting portion caulking 12aaa is formed. Perform the process.
　ガスケット肉だまりａ５ａは、電池蓋テーパー部６ｂが対向するに負極接続部１２ａの外径Ｂ部１２ａｃが、その他の外径Ａ部１２ａｂよりも大きいことによる圧縮量の増加分によって、実施例１及び２よりも高い圧縮状態で接続端子１２ａとの接触面及び電池蓋突起部６ａとの接触面及び負極集電板突起部２４ａとの接触面で面圧を発生させている。実施例１及び２と同様、電池蓋テーパー部６ｂは、負極接続部１２ａの軸の向きに電池蓋テーパ部圧縮面圧１１０ｄを発生させることを可能とするテーパー角度に成形されている。電池蓋テーパー部６ｂは、該圧縮面圧１１０ｄを長期的に安定して発生させることで、長期的なシール性の担保が可能となる。
　以上、実施例について簡単にまとめる。本実施例では、テーパー部（６ｂ）が対向する接続端子の径（１２ａｃ）が他の径（１２ａｂ）よりも大きいことを特徴とする。接続端子１２ａ、１４ａの一部の軸部を大きくすることによって、実施例５と同様の効果（ガスケット５の圧縮量の増加分による長期的なシール性能向上）を得ることができる。 In the gasket pool a5a, the battery lid taper portion 6b faces the outer diameter B portion 12ac of the negative electrode connection portion 12a, and the increase in the compression amount due to the fact that the outer diameter A portion 12ab is larger than the other outer diameter A portion 12ab. In a compressed state higher than 2, surface pressure is generated on the contact surface with the connection terminal 12a, the contact surface with the battery lid protrusion 6a, and the contact surface with the negative electrode current collector plate protrusion 24a. As in the first and second embodiments, the battery lid taper portion 6b is formed at a taper angle that allows the battery lid taper portion compression surface pressure 110d to be generated in the direction of the axis of the negative electrode connection portion 12a. The battery lid taper portion 6b can ensure long-term sealing performance by stably generating the compression surface pressure 110d for a long time.
The examples are briefly summarized above. The present embodiment is characterized in that the diameter (12ac) of the connection terminal facing the tapered portion (6b) is larger than the other diameter (12ab). By enlarging some shaft portions of the connection terminals 12a and 14a, it is possible to obtain the same effect as in the fifth embodiment (long-term sealing performance improvement due to an increase in the compression amount of the gasket 5).
　実施例１、２、３、４、５、６では、負極側の構成のみを示したが、本実施形態は、負極側に限定するものではなく、正極側と負極側の少なくとも一方がかかる構成を有していればよく、本実施例では正極側も負極側と同様の構成を有している。
　また、実施例ではテーパー形状を例にして説明したが、Ｒ形状でも良く、本願が解決しようとする課題に対しては同様に解決することが可能である。
　また、いずれの実施例の場合であってもテーパー部６ｂが対向する接続端子１２ａ、１４ａの軸部に転造や切削により凹凸を設けてもよい。このような構成にすることによって、より長期的なシール性能を向上させることができる。
　以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。 In Examples 1, 2, 3, 4, 5, and 6, only the configuration on the negative electrode side was shown. However, the present embodiment is not limited to the negative electrode side, and the configuration on which at least one of the positive electrode side and the negative electrode side is applied. In this embodiment, the positive electrode side has the same configuration as the negative electrode side.
Moreover, although the taper shape was demonstrated to the example in the Example, R shape may be sufficient and it can solve similarly the subject which this application tends to solve.
In any of the embodiments, the shaft portions of the connection terminals 12a and 14a opposed to the tapered portion 6b may be provided with irregularities by rolling or cutting. With such a configuration, longer-term sealing performance can be improved.
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
１　　　 電池缶
１a　　  開口部
１b 　 　幅広側面
１c  　　幅狭側面
１d  　　底面
２　　　 絶縁保護フィルム
３　　 　捲回群
５　 　　ガスケット
５ａ　　 ガスケット肉だまりａ部
５ｂ　　 ガスケット肉だまりｂ部
６ 　　　電池蓋
６ａ　　 電池蓋突起部
６ｂ　　 電池蓋テーパー部
６ｃ　　 電池蓋離間部
７ａ　　 絶縁板ａ
７ａａ　 絶縁板突起部
７ｂ　　 絶縁板ｂ
９　　 　注液口
１０ 　　ガス排出弁
１１　　 注液栓
１２　 　負極外部端子
１２ａ　 負極接続部
１２ａａ 負極接続部仮かしめ
１２ａａａ 負極接続部かしめ
１２ａｂ 外径Ａ部
１２ａｃ 外径Ｂ部
１４　　 正極外部端子
１４ａ　 正極接続部
２１　　 負極集電板基部
２２　　 負極接続端部
２３　　 負極側開口穴
２４　　 負極集電板
２４ａ　 負極集電板突起部
２４ｂ　 負極集電板テーパー部対向突起部
２６　　 負極側貫通孔
３２　　 負極電極
３２a　　負極箔
３２b 　 負極合剤層
３２c 　 負極箔露出部
３３　　 セパレータ
３４　　 正極電極
３４ａ　 正極箔
３４b 　 正極合剤層
３４c  　正極箔露出部
３５　　 セパレータ
４１　　 正極集電板基部
４２　　 正極接続端部
４４　　 正極集電板
４６　　 正極側貫通孔
１００　 二次電池
１１０　 圧縮荷重
１１０ａ 絶縁板突起部圧縮荷重　 
１１０ｂ 電池蓋突起部圧縮荷重
１１０ｃ 絶縁板挟搾部圧縮荷重
１１０ｄ 電池蓋テーパー部圧縮荷重 DESCRIPTION OF SYMBOLS 1 Battery can 1a Opening part 1b Wide side surface 1c Narrow side surface 1d Bottom surface 2 Insulating protective film 3 Winding group 5 Gasket 5a Gasket pool part a 5b Gasket pool part b 6 Battery cover 6a Battery cover projection part 6b Battery cover taper part 6c Battery lid separating part 7a Insulating plate a
7aa Insulating plate protrusion 7b Insulating plate b
9 Injection port 10 Gas discharge valve 11 Injection plug 12 Negative electrode external terminal 12a Negative electrode connection part 12aa Negative electrode connection part temporary caulking 12aaa Negative electrode connection part caulking 12ab Outer diameter A part 12ac Outer diameter B part 14 Positive electrode external terminal 14a Positive electrode connection part 21 Negative electrode collector plate base portion 22 Negative electrode connection end portion 23 Negative electrode side opening hole 24 Negative electrode current collector plate 24a Negative electrode current collector plate protrusion portion 24b Negative electrode current collector taper portion opposed protrusion portion 26 Negative electrode side through hole 32 Negative electrode electrode 32a Negative electrode foil 32b Negative electrode Mixture layer 32c Negative electrode foil exposed portion 33 Separator 34 Positive electrode 34a Positive electrode foil 34b Positive electrode mixture layer 34c Positive electrode foil exposed portion 35 Separator 41 Positive current collector plate base 42 Positive electrode connection end 44 Positive current collector plate 46 Positive electrode side through hole 100 Secondary battery 110 Compressive load 110a Insulating plate protrusion compressive load
110b Battery cover protrusion compressive load 110c Insulating plate pinching part compressive load 110d Battery cover taper compressive load

Claims (8)

  1. 　蓄電要素と、
    　前記蓄電要素と接続される集電板と、
    　前記蓄電要素および集電板とを収納し、開口が設けられた電池容器と、
    　前記電池容器の開口を塞ぎ、外部端子が配置された蓋と、
    　前記外部端子と前記集電板とを接続する接続端子と、を備えた二次電池において、
    　前記接続端子の軸の周りにはガスケットを有し、
    　前記ガスケットには一対の幅狭部が設けられ、
    　前記蓋又は集電板には、前記一対の幅狭部間配置されたテーパー部が設けられることを特徴とする二次電池。     A storage element;
    A current collector connected to the power storage element;
    A battery container that houses the power storage element and the current collector plate and is provided with an opening;
    A lid on which an opening of the battery container is closed and an external terminal is disposed;
    In a secondary battery comprising a connection terminal for connecting the external terminal and the current collector plate,
    There is a gasket around the axis of the connection terminal,
    The gasket is provided with a pair of narrow portions,
    The secondary battery according to claim 1, wherein the lid or the current collector plate is provided with a tapered portion disposed between the pair of narrow portions.
  2. 　請求項１に記載の二次電池において、
    　前記テーパー部は蓋側に設けられ、
    　前記一対の幅狭部のうち、一方側の幅狭部に対応する位置には、前記蓋から突出した突起部が形成されることを特徴とする二次電池。     The secondary battery according to claim 1,
    The tapered portion is provided on the lid side,
    A protrusion that protrudes from the lid is formed at a position corresponding to the narrow portion on one side of the pair of narrow portions.
  3. 　請求項２に記載の二次電池において、
    　前記一対の幅狭部のうち、他方側の幅狭部に対応する位置には、前記テーパー部の端部が形成されることを特徴とする二次電池。     The secondary battery according to claim 2,
    An end of the tapered portion is formed at a position corresponding to the narrow portion on the other side of the pair of narrow portions.
  4. 　請求項３に記載の二次電池において、
    　前記突起部は前記テーパー部から連続して設けられることを特徴とする二次電池。     The secondary battery according to claim 3,
    The secondary battery is characterized in that the protrusion is provided continuously from the tapered portion.
  5. 　請求項３に記載の二次電池において、
    　前記突起部は前記テーパー部から離間して設けられることを特徴とする二次電池。     The secondary battery according to claim 3,
    The secondary battery according to claim 1, wherein the protrusion is provided apart from the tapered portion.
  6. 　請求項１に記載の二次電池において、
    　前記テーパー部は蓋側に設けられ、
    　前記一対の幅狭部のうち、一方側の幅狭部に対応する位置には、前記集電板から突出した突起部が形成されることを特徴とする二次電池。     The secondary battery according to claim 1,
    The tapered portion is provided on the lid side,
    The secondary battery is characterized in that a protrusion protruding from the current collector plate is formed at a position corresponding to the narrow portion on one side of the pair of narrow portions.
  7. 　請求項２及び６に記載の二次電池において、
    　前記テーパー部が対向する前記集電板部に突起部が設けられていることを特徴とする二次電池。     The secondary battery according to claim 2 or 6,
    A secondary battery, wherein a protrusion is provided on the current collecting plate portion opposed to the tapered portion.
  8. 　請求項２及び６に記載の二次電池において、
    　前記テーパー部が対向する接続端子の径が他の径よりも大きいことを特徴とする二次電池。     The secondary battery according to claim 2 or 6,
    A secondary battery, wherein a diameter of a connection terminal facing the tapered portion is larger than another diameter.
PCT/JP2018/002630 2017-02-28 2018-01-29 Secondary battery WO2018159180A1 (en)

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