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WO2022009997A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2022009997A1
WO2022009997A1 PCT/JP2021/026538 JP2021026538W WO2022009997A1 WO 2022009997 A1 WO2022009997 A1 WO 2022009997A1 JP 2021026538 W JP2021026538 W JP 2021026538W WO 2022009997 A1 WO2022009997 A1 WO 2022009997A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
battery
groove
negative electrode
positive electrode
Prior art date
Application number
PCT/JP2021/026538
Other languages
English (en)
Japanese (ja)
Inventor
昌義 谷田
弘隆 前吉
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2022009997A1 publication Critical patent/WO2022009997A1/fr

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    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • 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

  • the present invention relates to a secondary battery, and more particularly to a secondary battery using a square battery can in the outer case.
  • the secondary battery is a so-called storage battery, it can be repeatedly charged and discharged, and is used for various purposes.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones and notebook computers.
  • an electrode assembly in which an electrode constituent layer including a positive electrode, a negative electrode and a separator is wound or laminated is impregnated in an electrolytic solution and enclosed in an outer case made of a battery can.
  • Patent Document 1 proposes a secondary battery in which a cleavage groove is provided on a side surface of a square battery can.
  • a cleavage groove is provided on the side surface of the square battery can so as to intersect diagonally.
  • a large stress is applied to the diagonal portion of the side surface of the square battery can, so that the opening formed by the cleavage of the cleavage groove can be increased.
  • a square battery can is referred to as a battery can.
  • the thickness of the battery can When the thickness of the battery can is large, the strength of the battery can is large, so that the stress when the internal pressure rises tends to be concentrated in the cleavage groove, and the cleavage groove can be opened.
  • the thickness of the battery can becomes thin for example, according to the findings of the present inventors, when the thickness of the battery can becomes 0.1 mm or less, the deformation of the entire battery can becomes large, so that the cleavage groove is cleaved. There is a problem that a place other than the cleavage groove is cleaved before the opening, or a larger stress is required to cleave the cleavage groove. In such a case, it becomes difficult to ensure the safety of the secondary battery.
  • the thickness of the cleavage groove portion of the battery can becomes thin, and the strength required for normal use cannot be secured, or the battery There is a problem that the processing cost of the can increases.
  • an object of the present invention is to provide a secondary battery capable of ensuring the safety of the secondary battery even if the thickness of the battery can is reduced.
  • the secondary battery of the present invention is a secondary battery using a square battery can for the outer case, and the square battery can has a pair of facing main surfaces and the pair of main surfaces. It has a peripheral surface located between the surfaces, and has a groove located on at least one diagonal of the at least one main surface on at least one main surface of the pair of main surfaces. It is characterized by.
  • the present invention it is possible to provide a secondary battery capable of ensuring the safety of the secondary battery even if the thickness of the battery can is reduced.
  • it is a simulation result showing the relationship between the internal pressure and the strain when the L / D is set to 0.1, the length of the groove is fixed, and the position of the start point of the groove is changed.
  • it is a simulation result showing the relationship between the internal pressure and the strain when the position of the starting point of the groove is fixed and the length of the groove is changed with d / D set to 0.15.
  • cross-sectional view described directly or indirectly herein is based on a hypothetical cross section of a secondary battery cut along the stacking direction of the electrode assembly or electrode constituent layers that make up the secondary battery. ing. Further, the "planar view” used in the present specification is based on a sketch when the object is viewed from above or below along the direction of the thickness.
  • the "secondary battery” referred to in the present specification refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery according to the present invention is not excessively bound by its name, and may include, for example, a power storage device.
  • FIG. 1 is a schematic perspective view showing an example of the external shape of the secondary battery according to the present embodiment.
  • the secondary battery A uses a square battery can 1 as an outer case, and an electrode assembly in which one or a plurality of electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated in the square battery can 1 (not). (Illustrated) is housed.
  • the square battery can 1 has a pair of main surfaces 11 and 12 facing each other and a peripheral surface 13 located between the pair of main surfaces 11 and 12.
  • the main surface 11 has corners 111, 112, 113, 114 at the four corners.
  • the main surface 11 has virtual diagonal lines 115 and 116, and in plan view, the diagonal line 115 extends from one corner 111 through the center 117 of the main surface 11 to the other corner 112. Another diagonal 116 extends from one corner 113 through the center 117 of the main surface 11 to the other corner 114. Further, a groove 118 is formed on the diagonal line 115.
  • the main surface means the surface having the maximum area in the surface of the battery can.
  • the center of the main surface is said to be the point where two diagonal lines intersect.
  • the fact that the groove is located diagonally means that the groove overlaps the diagonal line in the length direction of the groove in a plan view.
  • the battery When the internal pressure of the battery can rises, the battery can is deformed so that the diagonal becomes a ridge and swells. By providing the grooves on the diagonal line, the deformation becomes larger and the battery can is easily cleaved. Therefore, even when the thickness of the battery can is reduced, it can be easily cleaved at the groove portion.
  • FIG. 2 is a simulation result showing the distribution of strain generated on the main surface of the battery can of the secondary battery according to the embodiment of the present invention
  • FIG. 3 is the main surface of the battery can of the secondary battery according to the comparative example. It is a simulation result showing the distribution of the strain generated in.
  • a battery can described in Patent Document 1 in which a cleavage groove is provided so as to intersect diagonally is used.
  • the thickness of the battery cans used in Examples and Comparative Examples was 0.0075 mm, and the internal pressure was 1 MPa. The lighter the color, the greater the strain, and the darker the color, the smaller the strain.
  • the stress is concentrated in the groove portion and the strain is large, whereas in the comparative example, the strain is generated in the portion other than the groove, specifically, the diagonal portion, and the stress is dispersed. You can see that.
  • the present invention by providing the grooves diagonally, it is possible to easily cleave the grooves by concentrating the stress on the grooves.
  • FIG. 4 is a simulation result showing the relationship between the internal pressure and the strain generated in the groove in the secondary battery according to the comparative example, and shows the case where the thickness of the battery can is 0.2 mm and 0.075 mm. ing.
  • the strain tends to increase as the internal pressure increases.
  • the thickness of the battery can is 0.075 mm, the strain increases at first and the groove is deformed as the internal pressure increases, but when the internal pressure exceeds a certain level, the strain tends not to increase. It is considered that this is because the stress concentration on the groove portion is relaxed by the start of deformation of the portion other than the groove portion, and the strain of the groove portion is less likely to increase.
  • the thickness of the battery can when the thickness of the battery can is reduced, for example, when the thickness is 0.1 mm or less, a place other than the groove may be cleaved or the groove may be cleaved before the groove is cleaved. There is a problem that a large stress is required.
  • FIG. 5 is a simulation result showing the relationship between the internal pressure and the strain generated in the groove when a battery can having a thickness of 0.075 mm is used in the secondary batteries of the example and the comparative example. ..
  • the example it can be seen that as the internal pressure increases, a larger strain is generated in the groove as compared with the comparative example. From this, it can be seen that in the examples, the grooves are more easily cleaved than in the comparative examples.
  • FIG. 1 shows an example in which the groove is located on one diagonal line of one main surface, but the present invention is not limited thereto.
  • grooves may be located on each of the two diagonal lines on one main surface.
  • the number of grooves may be one or a plurality, and the plurality of grooves may be located on the same diagonal line, but the predetermined strength required for the battery can can be secured and the processing cost of the battery can can be reduced. From the viewpoint of suppressing the increase, it is preferable that one groove is located diagonally between the center of the main surface and one corner.
  • FIG. 6 is a top view of the battery can for explaining the position and length of the groove.
  • the groove 118 has a start point 118a on one corner 111 side and an end point 118b on the center 117 side.
  • the d / D is preferably 0 or more and 0.2 or less. .. More preferably, the d / D is 0.05 or more and 0.2 or less.
  • the groove has a length L defined by the distance between the start point 118a and the end point 118b, and the L / D is preferably 0.05 or more and 1 or less. More preferably, the L / D is 0.1 or more and 1 or less.
  • FIG. 7 is a simulation result showing the relationship between the internal pressure and the strain when the L / D is set to 0.1, the length of the groove is fixed, and the position of the start point of the groove is changed in the embodiment.
  • (1) is when d / D is in the range of 0.1 or more and 0.2 or less
  • (2) is when d / D is in the range of 0.15 or more and 0.25 or less (3).
  • FIG. 8 is an example of a simulation result showing the relationship between the internal pressure and the strain when the position of the starting point of the groove is fixed and the length of the groove is changed by setting the d / D to 0.15 in the embodiment. ..
  • (4) is when the L / D is 0.2
  • (5) is when the L / D is 0.1
  • (6) is when the L / D is 0.05.
  • the results are shown. From FIG. 7, it can be seen that the closer the position of the starting point of the groove is to the corner, the greater the strain. Further, from FIG. 8, it can be seen that the longer the groove length, the greater the strain.
  • the groove depth t is t from the viewpoint of securing the residual wall thickness for ensuring the strength required for the battery can and from the viewpoint of reducing the processing cost when the thickness of the battery can is T.
  • / T is 0.2 or more and 0.4 or less, preferably 0.3 or more and 0.4 or less.
  • the cross-sectional shape of the groove in the width direction is not particularly limited, but may be, for example, a V-shape in which the groove width narrows along the depth direction or a U-shape in which the groove width does not change in the depth direction. can.
  • the groove can be formed by processing the battery can by drawing or the like and then processing by an etching method or a press process or the like.
  • the battery can used in the present invention is a square battery can.
  • the square battery can is not particularly limited as long as its cross-sectional shape is rectangular, and its appearance includes not only a rectangular parallelepiped shape or a cubic shape but also a flat shape.
  • the battery can may be any as long as it has a can portion having an opening and a sealing portion for sealing the opening.
  • a known battery can made of aluminum alloy or the like can be used as the battery can.
  • the thickness of the battery can is not particularly limited, but when a battery can having a thickness of 0.1 mm or less is used, a particularly excellent effect can be obtained in that the groove is easily cleaved.
  • the secondary battery according to the present invention includes an electrode assembly in which one or more electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated.
  • an electrode assembly is enclosed in a battery can together with an electrolyte (for example, a non-aqueous electrolyte).
  • the structure of the electrode assembly is not necessarily limited to the planar laminated structure, and for example, an electrode unit (electrode constituent layer) including a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode is wound in a roll shape. It may have a winding structure.
  • the electrode assembly may have a so-called stack-and-folding structure in which a positive electrode, a separator and a negative electrode are laminated on a long film and then folded.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector.
  • a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may be provided with positive electrode material layers on both sides of the positive electrode current collector, or the positive electrode material layer may be provided on only one side of the positive electrode current collector. It may be the one that exists.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector.
  • a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • each of the plurality of negative electrodes in the electrode assembly may be provided with a negative electrode material layer on both sides of the negative electrode current collector, or a negative electrode material layer may be provided on only one side of the negative electrode current collector. It may be the one that exists.
  • the electrode active materials contained in the positive and negative electrodes are substances that are directly involved in the transfer of electrons in the secondary battery, and are the main substances of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. be. More specifically, ions are brought to the electrolyte due to the "positive electrode active material contained in the positive electrode material layer" and the "negative electrode active material contained in the negative electrode material layer", and such ions are transferred between the positive electrode and the negative electrode. The electrons are transferred and charged and discharged.
  • the positive electrode material layer and the negative electrode material layer are particularly preferably layers that can occlude and release lithium ions.
  • the secondary battery according to the present invention is a non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode and the negative electrode via the non-aqueous electrolyte to charge and discharge the battery. ..
  • the secondary battery according to the present invention corresponds to a so-called "lithium ion battery", and the positive electrode and the negative electrode have a layer capable of occluding and discharging lithium ions.
  • the positive electrode active material of the positive electrode material layer is composed of, for example, granules
  • a binder may be contained in the positive electrode material layer for more sufficient contact between particles and shape retention.
  • a conductive auxiliary agent may be contained in the positive electrode material layer in order to facilitate the transfer of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is composed of, for example, granules, it may contain a binder for better contact between the particles and shape retention, and transfer of electrons to promote the battery reaction.
  • a conductive auxiliary agent may be contained in the negative electrode material layer in order to facilitate the above.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as a “positive electrode mixture layer” and a “negative electrode mixture layer”, respectively, because of the form in which a plurality of components are contained.
  • the positive electrode active material may be a substance that contributes to the occlusion and release of lithium ions.
  • the positive electrode active material may be, for example, a lithium-containing composite oxide.
  • the positive electrode active material may be a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably contained as the positive electrode active material.
  • the positive electrode active material may be lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, or a part of the transition metal thereof replaced with another metal.
  • Such a positive electrode active material may be contained as a single species, but may be contained in combination of two or more species.
  • the binder that can be contained in the positive electrode material layer is not particularly limited, but is not particularly limited, but is limited to polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer and polytetrafluoroethylene. At least one species selected from the group consisting of the above can be mentioned.
  • the conductive auxiliary agent that can be contained in the positive electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes and vapor phase growth. At least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the thickness dimension of the positive electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the positive electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the negative electrode active material may be a substance that contributes to the occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, and / or lithium alloys.
  • Examples of various carbon materials for the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, and diamond-like carbon.
  • graphite has high electron conductivity and excellent adhesion to a negative electrode current collector.
  • the oxide of the negative electrode active material at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide and the like can be mentioned.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium, for example, Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn, It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide may be amorphous as its structural form. This is because deterioration due to non-uniformity such as grain boundaries or defects is less likely to occur.
  • the binder that can be contained in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene-butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide-based resin, and polyamide-imide-based resin. Can be mentioned.
  • the binder contained in the negative electrode material layer may be styrene-butadiene rubber.
  • the conductive auxiliary agent that can be contained in the negative electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes and vapor phase growth.
  • the negative electrode material layer may contain a component derived from the thickener component (for example, carboxylmethyl cellulose) used at the time of manufacturing the battery.
  • the thickness dimension of the negative electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the negative electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated by the electrode active material due to the battery reaction.
  • Such an electrode current collector may be a sheet-shaped metal member. Further, such an electrode current collector may have a porous or perforated form.
  • the current collector may be a metal leaf, a punching metal, a net, an expanded metal, or the like.
  • the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • stainless steel in this specification refers to stainless steel specified in, for example, “JIS G 0203 steel term", and may be chromium or an alloy steel containing chromium and nickel.
  • the thickness dimensions of the positive electrode current collector and the negative electrode current collector are not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 10 ⁇ m or more and 70 ⁇ m or less.
  • the thickness dimension of the positive electrode current collector and the negative electrode current collector is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the separator used for the positive electrode and the negative electrode is a member provided from the viewpoint of preventing a short circuit due to contact between the positive and negative electrodes and retaining the electrolyte.
  • the separator is a member through which ions pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member, which has a film morphology due to its small thickness.
  • a microporous film made of polyolefin may be used as a separator.
  • the microporous membrane used as the separator may contain, for example, only polyethylene (PE) or polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of a "microporous membrane made of PE" and a "microporous membrane made of PP".
  • the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer or the like.
  • the surface of the separator may have adhesiveness.
  • the separator should not be particularly bound by its name, and may be a solid electrolyte, a gel-like electrolyte, and / or an insulating inorganic particle having the same function.
  • the thickness dimension of the separator is not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 2 ⁇ m or more and 20 ⁇ m or less.
  • the thickness dimension of the separator is the thickness inside the secondary battery (particularly the thickness between the positive electrode and the negative electrode), and the average value of the measured values at any 10 points may be adopted.
  • an electrode assembly composed of an electrode constituent layer including a positive electrode, a negative electrode and a separator is enclosed in a battery can together with an electrolyte.
  • the electrolyte can assist in the movement of metal ions emitted from the electrodes (positive electrode and / or negative electrode).
  • the electrolyte may be a "non-aqueous" electrolyte such as an organic electrolyte and an organic solvent, or it may be a "water-based" electrolyte containing water.
  • the electrolyte is preferably an "non-aqueous" electrolyte containing an organic electrolyte and / or an organic solvent and the like. That is, it is preferable that the electrolyte is a non-aqueous electrolyte.
  • the electrolyte there will be metal ions emitted from the electrodes (positive electrode and / or negative electrode), and therefore the electrolyte will assist in the movement of the metal ions in the battery reaction.
  • the electrolyte may be in the form of a liquid or a gel.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • the specific solvent for the non-aqueous electrolyte may be one containing at least carbonate.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC) and vinylene carbonate (VC). be able to.
  • the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC) and dipropyl carbonate (DPC).
  • non-aqueous electrolyte a combination of cyclic carbonates and chain carbonates may be used as the non-aqueous electrolyte, and for example, a mixture of ethylene carbonate and diethyl carbonate may be used.
  • a specific non-aqueous electrolyte solute for example, a Li salt such as LiPF 6 and / or LiBF 4 may be used.
  • the secondary battery according to the present invention can be used in various fields where storage is expected.
  • the secondary battery according to the present invention is merely an example, but the secondary battery according to the present invention is used in the fields of electricity, information, and communication (for example, mobile phones, smartphones, laptop computers and digital cameras, activity meters, arm computers, etc.) in which mobile devices and the like are used.
  • household / small industrial applications for example, electric tools
  • Golf cart, home / nursing / industrial robot field large industrial use (eg forklift, elevator, bay port crane field)
  • transportation system field eg hybrid car, electric car, bus, train, Electric assisted bicycles, electric motorcycles and other electric vehicles
  • power system applications for example, various power generation, road conditioners, smart grids, general household-installed power storage systems, etc.
  • medical applications earphone hearing aids and other medical equipment fields
  • Pharmaceutical applications fields such as dose management systems
  • IoT fields for example, fields such as space explorers and submersible research vessels.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne une batterie secondaire qui peut assurer la sécurité de la batterie secondaire même lorsque l'épaisseur d'un boîtier de batterie est mince. La batterie secondaire de la présente invention est une batterie secondaire qui utilise une batterie carrée pour le boîtier extérieur. La batterie carrée peut comporter une paire de surfaces principales opposées, et une surface périphérique positionnée entre la paire de surfaces principales, et au moins une surface principale de la paire de surfaces principales comporte une rainure positionnée sur au moins une ligne diagonale d'au moins une surface principale.
PCT/JP2021/026538 2020-07-10 2021-07-08 Batterie secondaire WO2022009997A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-119107 2020-07-10
JP2020119107 2020-07-10

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WO2022009997A1 true WO2022009997A1 (fr) 2022-01-13

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PCT/JP2021/026538 WO2022009997A1 (fr) 2020-07-10 2021-07-08 Batterie secondaire

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6159631A (en) * 1998-08-27 2000-12-12 Polystor Corporation Overcharge safety vents on prismatic cells
US20050106451A1 (en) * 2003-10-20 2005-05-19 Samsung Sdi Co., Ltd. Secondary battery with safety vents
JP2008519406A (ja) * 2004-11-16 2008-06-05 ビーワイディー カンパニー リミテッド 爆発防止電池のタイプ
JP2013098173A (ja) * 2011-11-01 2013-05-20 Hitachi Maxell Ltd 密閉型電池
JP2014086162A (ja) * 2012-10-19 2014-05-12 Hitachi Maxell Ltd 密閉型電池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6159631A (en) * 1998-08-27 2000-12-12 Polystor Corporation Overcharge safety vents on prismatic cells
US20050106451A1 (en) * 2003-10-20 2005-05-19 Samsung Sdi Co., Ltd. Secondary battery with safety vents
JP2008519406A (ja) * 2004-11-16 2008-06-05 ビーワイディー カンパニー リミテッド 爆発防止電池のタイプ
JP2013098173A (ja) * 2011-11-01 2013-05-20 Hitachi Maxell Ltd 密閉型電池
JP2014086162A (ja) * 2012-10-19 2014-05-12 Hitachi Maxell Ltd 密閉型電池

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