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WO2018100846A1 - Batterie rechargeable et dispositif - Google Patents

Batterie rechargeable et dispositif Download PDF

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Publication number
WO2018100846A1
WO2018100846A1 PCT/JP2017/033556 JP2017033556W WO2018100846A1 WO 2018100846 A1 WO2018100846 A1 WO 2018100846A1 JP 2017033556 W JP2017033556 W JP 2017033556W WO 2018100846 A1 WO2018100846 A1 WO 2018100846A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
substrate
bent
step portion
battery according
Prior art date
Application number
PCT/JP2017/033556
Other languages
English (en)
Japanese (ja)
Inventor
徹 川合
大塚　正博
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 WO2018100846A1 publication Critical patent/WO2018100846A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery and a device.
  • a secondary battery generally has a structure in which an electrode assembly (electrode body) and an electrolyte are accommodated in an exterior body (case), and further includes an external terminal for achieving electrical connection of the secondary battery. ing.
  • Patent Document 1 A secondary battery provided with a stepped portion has been reported as a secondary battery that meets such requirements.
  • the secondary battery is generally used together with a substrate, for example, an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
  • a substrate for example, an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
  • the protection circuit board is often used in lithium ion secondary batteries for the purpose of preventing overcharge, overdischarge and overcurrent.
  • the inventors of the present invention have a new problem that when a step portion is provided in a secondary battery and a substrate is disposed there, a positional shift occurs between the secondary battery and the substrate due to vibration or the like. I found out. Specifically, as shown in FIG. 7, in the secondary battery 500 having the stepped portion 501, if the substrate 600 is disposed on the lower stepped portion 510 having the upper surface 502 having a relatively low height, the mutual displacement due to vibration or the like. Therefore, there is a problem that the electrical connection between the secondary battery 500 and the substrate 600 is lost. There is also a problem that the secondary battery 500 and the substrate 600 damage each other.
  • An object of the present invention is to provide a secondary battery that prevents mutual displacement of the substrate due to vibration or the like.
  • the present invention An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is enclosed in an exterior body,
  • the secondary battery has at least one step portion constituted by two upper surfaces having different heights; A seal portion on at least one side surface of the low step portion having a relatively low height of the upper surface;
  • the seal part can be bent in the thickness direction of the secondary battery,
  • the present invention relates to a secondary battery in which a bent seal portion formed when the seal portion is bent serves as a stopper portion for a substrate disposed on an upper surface of the low step portion.
  • the secondary battery of the present invention prevents mutual displacement of a substrate, particularly a substrate disposed in a lower step portion of the substrate, due to vibration or the like. As a result, the electrical connection between the secondary battery and the substrate can be maintained, and mutual damage between the secondary battery and the substrate can be prevented.
  • the substrate can be disposed on the upper surface while preventing the displacement as described above, space saving of the substrate can be achieved, and the secondary battery and the substrate are disposed. Can increase the degree of freedom.
  • FIG. 1 shows a schematic perspective view of a device including a secondary battery and a substrate according to a first embodiment of the present invention.
  • FIG. 1B shows a schematic plan view of the device of FIG. 1A.
  • FIG. FIG. 1B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 1A.
  • 1C is a schematic enlarged cross-sectional view of the device when the PP section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the lower step portion. It is sectional drawing which shows the state of time.
  • 1C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG.
  • FIG. 1C is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
  • FIG. 1C is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion indirectly becomes a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
  • 1C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion indirectly serves as a stopper portion for the substrate disposed on the low step portion.
  • 1C is a schematic enlarged cross-sectional view of the device when the RR cross section of the device of FIG. 1C is viewed in the direction of the arrow. It is typical sectional drawing for demonstrating the folding shape of a bending seal part, and the height h1 of a bending seal part and the height h2 of a board
  • FIG. 3B shows a schematic plan view of the device of FIG. 3A.
  • FIG. 3B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 3A.
  • FIG. 3C is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 3C is viewed in the direction of the arrow, and the bent seal portion is directly disposed on the low step portion (second step portion). It is sectional drawing which shows a state when it becomes a stopper part with respect to a board
  • 3C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG. 3C is viewed in the direction of the arrow, and the folded seal portion is directly disposed on the low step portion (first step portion).
  • FIG. 5B is a schematic plan view showing a state when the seal portion is bent in the device of FIG.
  • FIG. 5B is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 5B is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
  • FIG. 5B is a schematic enlarged cross-sectional view of the device when the RR cross-section of the device of FIG. 5B is viewed in the arrow direction.
  • the typical perspective view of the device containing the secondary battery and substrate concerning a 4th embodiment of the present invention is shown.
  • FIG. 6B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 6A.
  • substrate which concern on a prior art is shown.
  • the present invention provides a secondary battery.
  • the term “secondary battery” refers to a battery that can be repeatedly charged and discharged.
  • the “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
  • the shape of the secondary battery of the present invention is not particularly limited, and may be a shape having a stepped portion described below on the upper surface or a shape not having the stepped portion. From the viewpoint of practical usability, a shape having the step portion is preferable.
  • the secondary battery of the present invention has a stepped portion
  • the secondary battery of the present invention is not particularly limited in the shape of the secondary battery as long as the bent seal portion directly or indirectly becomes the stopper portion of the substrate, as will be described later. It is clear that is obtained.
  • various elements in the drawings are merely schematically and exemplarily shown for understanding of the present invention, and the appearance and size ratio may be different from the actual ones.
  • the “vertical direction”, “left / right direction”, and “front / back direction” used directly or indirectly in this specification correspond to directions corresponding to the vertical direction, left / right direction, and front / back direction in the drawing, respectively. Unless otherwise specified, the same symbols or symbols indicate the same members or the same meaning.
  • FIGS. 1A and 1B An example of a secondary battery according to the first embodiment and a schematic perspective view and a schematic plan view of a device including a substrate are shown in FIGS. 1A and 1B.
  • an electrode assembly and an electrolyte which will be described later, are enclosed in the exterior body 6, and the peripheral portions 91a to 91d hold the electrolyte and the like inside the exterior body 6 in plan view.
  • the sealing part (sealing part) is formed.
  • the plan view is a state when the secondary battery is placed and viewed from directly above in the thickness (height) direction, and is in agreement with the plan view.
  • the mounting is, for example, mounting with the surface of the maximum area of the secondary battery as the bottom surface.
  • the seal portion is provided at the peripheral portion of the exterior body in a plan view so as to seal the electrode assembly, electrolyte, and the like inside the exterior body from the outside.
  • the seal portion is formed by joining the overlapping portions of the exterior body, and appears from the side surface of the secondary battery.
  • the seal portion is formed by heat sealing.
  • the seal portion does not necessarily have to be formed on all peripheral portions of the exterior body (secondary battery).
  • the seal portion may not be formed at the peripheral portion.
  • the secondary battery 100A of this embodiment has only one step portion 15 and includes a low step portion 10 having a relatively low top surface and a high step portion 20 having a relatively high top surface.
  • the step portion 15 is formed by two upper surfaces 11 and 21 having different heights.
  • the low step portion 10 has three side surfaces 10a, 10b, and 10c.
  • the side surface is a side surface including the exterior body 6 exposed in a state before the seal portion is bent as shown in FIG. 1A.
  • the side surface 10a is a surface facing the side surface 10c.
  • the seal portion provided on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100A, and in detail, is substantially parallel to the thickness direction. It can be bent. Since the exterior body 6 is composed of a soft sheet, the bent seal portion may be joined to a so-called main body portion of the secondary battery, as will be described later. The main body is used in a concept including the low stage 10 and the high stage 20 of the secondary battery. When the exterior body 6 is particularly formed of a plastic sheet, when the seal portion is folded in the thickness direction of the secondary battery 100A, the shape of the folded portion is maintained, so that the connection to the main body portion is not necessarily required.
  • FIG. 1C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 1A.
  • the bent seal portion 50 directly becomes a stopper portion for the substrate 60 ⁇ / b> A disposed on the low step portion 10, and at least the upper end portion (501) of the bent seal portion 50.
  • the protruding portion 501 of the bent seal portion 50 serves as a stopper portion for the substrate 60A.
  • the tip of the bent seal portion 50 protrudes higher than the height of the upper surface 11 of the low step portion.
  • the bent seal portion 50 When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60A arranged on the low step portion 10. As shown in FIGS. 1F and 1G, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60 ⁇ / b> A disposed on the low step portion 10, and the bent seal portion 50 is an extension member as a separate member.
  • the extension member 500 is protruded from the upper surface 11 of the low step portion 10, and the protrusion 502 of the extension member 500 is a stopper portion for the substrate.
  • the extension member 500 is a member that extends the bent seal portion 50 in the thickness direction of the secondary battery, and usually has a plate shape.
  • any material can be used as long as the material has a strength that can prevent the displacement of the substrate, and examples thereof include organic polymers such as polyolefin, polyester, polyamide, polyurethane, and polyimide. It is done.
  • the coupling means is not particularly limited as long as the coupling between the bent seal part 50 and the extending member 500 is achieved, and may be, for example, an adhesive or an adhesive tape.
  • an adhesive 56 is used as a coupling means.
  • 1F and FIG. 1G are schematic enlarged cross-sectional views of the device of FIG. 1C taken along the PP and QQ sections in the direction of the arrows, respectively, and the bent seal portion is indirectly low. It is sectional drawing which shows a state when it becomes a stopper part with respect to the board
  • the bent seal portion 50 supports the extension member 500 as a separate member, so that the extension member 500 of the low step portion 10 is supported. You may make it protrude from the upper surface 11 (not shown).
  • the protruding portions of both the extension member and the bent seal portion serve as stopper portions for the substrate, and the protruding portion of the extending member 500 reinforces the protruding portion of the bent seal portion, thereby improving the reliability of misalignment prevention. .
  • the bending direction is a direction substantially parallel to the thickness direction of the secondary battery 100A, for example, the upward direction when the secondary battery is placed. Specifically, the bending direction is, for example, the right direction in FIGS. 1D and 1F and the upward direction in FIGS. 1E and 1G.
  • the bent seal portion 50a prevents the upward displacement of the substrate 60A at the protruding portion 501 or 502.
  • the bent seal portion 50b prevents the substrate 60A from being displaced in the right direction at the protruding portion 501 or 502.
  • the bent seal portion 50c prevents the positional deviation of the substrate 60A in the downward direction at the protruding portion 501 or 502.
  • the height h1 (mm) of the protrusions 501 and 502 is not particularly limited as long as the protrusion exerts a stopper action against the positional deviation of the substrate.
  • the height h1 only needs to be higher than the height H of the upper surface 11 of the lower step portion on which the substrate is disposed.
  • the height h1 is equal to the height h2 (mm) of the substrate 60A.
  • the upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery 100A.
  • FIG. 1H is a schematic enlarged cross-sectional view of the device when the RR cross-section of the device of FIG. 1C is viewed in the direction of the arrow.
  • the bent seal portion 50 has a single bent shape that is simply bent once, but is not limited thereto. As shown in FIGS. 2A and 2B, it may have a folded shape formed by bending once or more after being bent once.
  • the height h3 (mm) is shown in FIGS. 2A and 2B.
  • FIG. 2A is a schematic cross-sectional view in the vicinity of the bent seal portion 50 when the bent seal portion 50, particularly the protrusions 501 and 502 exert a stopper action on the substrate.
  • FIG. 2B is a schematic cross-sectional view of the vicinity of the bent seal portion when the end portion of the secondary battery has the bent seal portion 50.
  • the seal portions (91a to 91c in FIG. 1B) on all the side surfaces are bent to form stopper portions.
  • the present embodiment is not limited to this, and for example, any one of the side seal portions may be folded into a stopper portion, or any two side seal portions may be folded into the stopper. It may be a part. From the standpoint of further preventing misalignment, it is preferable that all of the seal portions on the three side surfaces are bent to form a stopper portion.
  • the bent seal portion 50 may not be coupled to a so-called main body portion (a low-stage portion and a rear-stage portion) of the secondary battery.
  • main body portion a low-stage portion and a rear-stage portion
  • an adhesive 56 is used as a coupling means.
  • the protrusions 501 and 502 of the bent seal portion 50 may or may not be coupled to the substrate 60A. However, from the viewpoint of further preventing misalignment, at least in part, for example, FIG. As shown in FIGS. 1E, 1F and 1G, it is preferably bonded to the substrate 60A. Also in these drawings, the adhesive 56 is used as a coupling means.
  • the substrate 60A and the so-called main body part (low stage part and rear stage part) of the secondary battery may or may not be coupled to each other in part or all of the contact portions. From the standpoint of further preventing misalignment, it is preferable that at least a portion is coupled, for example, as shown in FIGS. 1E and 1G. Also in these drawings, the adhesive 56 is used as a coupling means.
  • the surplus portions 95a and 95b (corner areas indicated by broken lines) generated when the seal portions 91a to 91c are bent may be cut as long as the sealing inside the exterior body is maintained, Alternatively, it may be folded and bonded (attached) to one of the bent seal portions 50.
  • the secondary battery of this embodiment includes the secondary battery 100A of the first embodiment, and has one or more step portions in the secondary battery 100A of the first embodiment.
  • the secondary battery has n step portions (n is a natural number of 1 or more)
  • the secondary battery has (n + 1) upper surfaces with different heights.
  • the first step portion, the second step portion, the third step portion,..., And the (n + 1) -th step portion are called in order from the lowest top surface.
  • the secondary battery of this embodiment prevents misalignment with the substrate disposed on the upper surface of the first step portion (low step portion). That is, the seal portion on at least one of the three side surfaces of the first step portion can be bent.
  • the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented.
  • the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portion serves as a stopper portion for the substrate.
  • the low step portion is selected from the group consisting of step portions other than the step portion having the highest top surface (that is, the first step portion to the n th step portion).
  • the upper surface of the step portion on which the substrate to be prevented from being displaced is arranged on any of the first step portion to the n-th step portion.
  • the upper surface of a step part may be sufficient.
  • the step portion on which the substrate to be prevented from misalignment is arranged is the upper surface of the first step portion, similarly to the case where n is 1 in the present embodiment.
  • the seal portion on at least one of the three side surfaces of the first step portion can be bent.
  • the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented.
  • the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portions on the three side surfaces serve as stopper portions for the substrate.
  • the seal portion on at least one of the side surfaces (for example, two side surfaces) of the k-th step portion can be bent.
  • the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed directly or indirectly on the upper surface of the k-th step portion. That is, similarly to the mechanism in the first embodiment, the bent seal portion or the protruding portion of the extension member serves as a stopper portion of the substrate, and as a result, misalignment is prevented.
  • the bent seal portion or the extending member is a stopper portion for the substrate. Also works.
  • the height of the substrate disposed on the upper surface of the (k ⁇ 1) -th step portion is higher than the height of the upper surface of the k-th step portion, the displacement of the substrate disposed on the upper surface of the k-th step portion is further prevented.
  • the height h1 (mm) of the protrusion and the height h2 (mm) of the substrate are substantially the same as the height h1 of the protrusion and the height h2 of the substrate in the first embodiment, respectively.
  • the height h1 (mm) of the projecting portion only needs to be higher than the height H of the upper surface of the k-th step portion on which the substrate is arranged. From the viewpoint of further preventing positional displacement, the height h2 (mm) of the substrate is Therefore, it is preferable to satisfy the relational expression (1), and it is more preferable to satisfy the relational expression (2).
  • the upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery.
  • the secondary battery 100B of FIGS. 3A and 3B has the two step portions 15 and 25, and the upper surface of the step portion on which the substrate to be prevented from being displaced is the upper surface of the second step portion. Except this, it is the same as the secondary battery of FIGS. 1A and 1B.
  • the side surfaces 20a and 20c have seal portions 91a and 91c, and these seal portions can be bent.
  • the side surface 20a is a surface facing the side surface 20c.
  • the bent seal portions 50a and 50c formed when these seal portions 91a and 91c are bent are arranged directly or indirectly on the upper surface of the second step portion. This is a stopper for the substrate 60B1.
  • the protruding portions 501 of the bent seal portions 50a and 50c serve as a stopper portion of the substrate 60B1.
  • each of the substrate 60B1 is prevented from being displaced upward and downward.
  • the bent seal portions 50a and 50c (or the extension member (not shown)) are provided.
  • the height of the substrate 60B2 of the first step portion 10 is lower than the height of the upper surface 21 of the second step portion 20, but the height of the substrate 60B2 of the first step portion 10 is higher than the upper surface 21 of the second step portion 20. If it is higher than this, the positional deviation of the substrate 60B1 of the second step portion 20 is further prevented.
  • the height h1 (mm) of the protruding portion 501 and the height h2 (mm) of the substrate 60B1 are substantially the same as the height h1 of the protruding portion and the height h2 of the substrate in the first embodiment, respectively. This is the height from the bottom surface to the tip (upper end) of each member when the battery is placed with the maximum area of the secondary battery as the bottom surface.
  • the height h1 (mm) of the protruding portion 501 may be higher than the height H of the upper surface of the second step portion on which the substrate is disposed. From the standpoint of further preventing positional displacement, the height h2 (mm) of the substrate. Therefore, the relational expression (1) is preferably satisfied, and the relational expression (2) is more preferably satisfied.
  • FIG. 3C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 3A.
  • 3D is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 3C is viewed in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part.
  • 3E is a schematic enlarged cross-sectional view of the device of FIG. 3C viewed from the QQ section in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part.
  • the secondary battery 100C of the present embodiment is the same as the secondary battery 100A of the first embodiment, except that both the upper exterior member 6a and the lower exterior member 6b are cup molded bodies.
  • the secondary battery 100A of the first embodiment is a cup molded body in which only the upper exterior member 6a constituting the exterior body 6 has a thickness, but the secondary battery 100A of the third embodiment.
  • the battery 100C is a cup in which both the upper exterior member 6a and the lower exterior member 6b have a thickness, depending on the thickness (height) of the electrode assembly housed in the secondary battery. It is a molded body.
  • FIG. 5A is a schematic perspective view of a device including a secondary battery and a substrate according to the third embodiment.
  • 5C and 5D are schematic enlarged cross-sectional views of the device when the PP cross-section and the RR cross-section of the device of FIG. 5B are viewed in the direction of the arrows, respectively.
  • FIG. 5B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 5A.
  • the seal portion on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100C, and at least one derived from the seal portion.
  • the bent seal portion 50 (including 50a to 50c) directly or indirectly becomes a stopper portion for the substrate 60C disposed on the upper surface 11 of the low step portion 10.
  • FIG. 5C is a cross-sectional view showing a state where the bent seal portion directly becomes a stopper portion for the substrate disposed on the low step portion.
  • the bent seal portion 50 When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, as in the first embodiment, the bent seal portion 50 supports an extension member (not shown) as a separate member, The extension member may protrude from the upper surface 11 of the low step portion 10. The protruding portion of the extension member serves as a stopper portion for the substrate.
  • the height h1 (mm) of the protruding portion, the height h2 (mm) of the substrate, and the maximum height h3 (mm) of the secondary battery are all the maximum of the secondary battery. This is the height from the bottom surface to the tip (upper end) of each member when placed with the surface of the area as the bottom surface, for example, the heights h1, h2, and h3 shown in FIGS. 5C and 5D.
  • FIGS. 6A and 6B In the secondary battery 100D of this embodiment, as shown in FIGS. 6A and 6B, since the three sides of the low stage portion 10 are surrounded by the high stage portion 20, only one low stage portion 10 is exposed. Only the side surface 10d is provided, and the seal portion included in the one side surface 10d of the low step portion 10 is bent in the thickness direction of the secondary battery 100D, and the substrate 60D disposed on the upper surface 11 of the low step portion 10 The secondary battery is the same as the secondary battery 100A of the first embodiment except that it is a stopper portion.
  • FIG. 6A is a schematic perspective view of a device including a secondary battery and a substrate according to the fourth embodiment.
  • FIG. 6B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 6A.
  • the seal portion 91d on only one side surface 10d of the low step portion 10 can be bent in the thickness direction of the secondary battery 100D, and is derived from the seal portion. Only one bent seal portion 50b that acts as a stopper portion for the substrate 60D disposed on the upper surface 11 of the low step portion 10 is directly or indirectly.
  • the secondary battery of the present invention includes an embodiment in which the above embodiments are combined.
  • all the upper surfaces are usually substantially parallel to the horizontal surface and have a planar shape
  • the present invention is that the upper surface is inclined with respect to the horizontal surface and the upper surface is curved as long as the object of the present invention is achieved. It does not prevent having a shape.
  • the electrode assembly includes a positive electrode 1, a negative electrode 2, and a separator 3, and the positive electrode 1 and the negative electrode 2 are alternately arranged via the separator 3.
  • the two external terminals 5 are usually connected to electrodes (positive electrode or negative electrode) via current collecting leads, and as a result, are led out from the seal portion.
  • the electrode assembly has a planar laminated structure in which a plurality of electrode units (electrode constituent layers) including a positive electrode 1, a negative electrode 2, and a separator 3 arranged between the positive electrode 1 and the negative electrode 2 are laminated in a planar shape. have.
  • the structure of the electrode assembly is not limited to a planar laminated structure.
  • an electrode unit (electrode constituent layer) including a positive electrode 1, a negative electrode 2, and a separator 3 disposed between the positive electrode 1 and the negative electrode 2 is wound in a roll shape.
  • You may have a wound structure (jelly roll type).
  • the electrode assembly may have a so-called stack and folding structure in which a positive electrode, a separator, and a negative electrode are stacked on a long film and then folded.
  • the positive electrode 1 is composed of at least a positive electrode material layer and a positive electrode current collector (foil), and it is sufficient that the positive electrode material layer is provided on at least one surface of the positive electrode current collector.
  • a positive electrode material layer may be provided on both surfaces of the positive electrode current collector, or a positive electrode material layer may be provided on one surface of the positive electrode current collector.
  • the positive electrode 1 preferable from the viewpoint of further increasing the capacity of the secondary battery is provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
  • the positive electrode material layer contains a positive electrode active material.
  • the negative electrode 2 is composed of at least a negative electrode material layer and a negative electrode current collector (foil), and it is sufficient that the negative electrode material layer is provided on at least one surface of the negative electrode current collector.
  • the negative electrode material layer may be provided on both surfaces of the negative electrode current collector, or the negative electrode material layer may be provided on one surface of the negative electrode current collector.
  • the negative electrode 2 is preferably provided with a negative electrode material layer on both surfaces of the negative electrode current collector.
  • the negative electrode material layer contains a negative electrode active material.
  • the positive electrode active material included in the positive electrode material layer and the negative electrode active material included in the negative electrode material layer are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged. As will be described later, the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
  • the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”.
  • the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer for sufficient contact between the particles and shape retention. preferable. Furthermore, it is also preferable that a conductive additive is included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably 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 included as a positive electrode active material.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination.
  • the positive electrode active material contained in the positive electrode material layer is lithium cobalt oxide.
  • the binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive auxiliary agent that can be included in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • the binder of the positive electrode material layer is polyvinylidene fluoride
  • the conductive additive of the positive electrode material layer is carbon black.
  • the binder and conductive additive of the positive electrode material layer are a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like.
  • graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • 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.
  • a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of the negative electrode material layer is artificial graphite.
  • the binder that can be included 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 resin, and polyamideimide resin. Can be mentioned.
  • the binder contained in the negative electrode material layer is styrene butadiene rubber.
  • the conductive aid that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer.
  • the negative electrode active material and the binder in the negative electrode material layer are a combination of artificial graphite and styrene butadiene rubber.
  • 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 in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • 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.
  • the separator 3 is a member provided from the viewpoints of preventing a short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
  • the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member and has a film form due to its small thickness.
  • a polyolefin microporous film may be used as the separator.
  • the microporous membrane used as the separator may include, for example, only polyethylene (PE) or only 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.
  • the surface of the separator may have adhesiveness.
  • Electrolyte helps the movement of metal ions released from the electrodes (positive and negative electrodes).
  • the electrolyte may be a “non-aqueous” electrolyte, such as an organic electrolyte and an organic solvent, or may be a “aqueous” electrolyte containing water.
  • the secondary battery of the present invention is preferably a non-aqueous electrolyte secondary battery in which an electrolyte containing a “non-aqueous” solvent and a solute is used as an electrolyte.
  • the electrolyte may have a form such as liquid or gel (in the present specification, “liquid” non-aqueous electrolyte is also referred to as “non-aqueous electrolyte solution”).
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • examples of 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.
  • examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • non-aqueous electrolyte for example, a mixture of ethylene carbonate and diethyl carbonate.
  • nonaqueous electrolyte solutes for example, Li salts such as LiPF 6 and LiBF 4 are preferably used.
  • any current collecting lead used in the field of secondary batteries can be used.
  • a current collecting lead may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the form of the current collecting lead is not particularly limited, and may be, for example, a linear shape or a plate shape.
  • any external terminal used in the field of secondary batteries can be used.
  • Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the form of the external terminal 5 is not particularly limited, and is usually plate-shaped.
  • the external terminal 5 may be electrically and directly connected to the substrate 60, or may be electrically and indirectly connected to the substrate 60 through another device.
  • the current collecting lead can also be used as an external terminal.
  • the exterior body 6 is a flexible pouch (soft bag) made of a soft sheet.
  • the soft sheet only needs to have a degree of softness that can achieve bending of the seal portion, and is preferably a plastic sheet.
  • the plastic sheet is a sheet having a characteristic that the deformation due to the external force is maintained when the external sheet is applied and then removed.
  • a so-called laminate film can be used.
  • a flexible pouch made of a laminate film can be produced, for example, by laminating two laminate films and heat-sealing the peripheral edge.
  • As the laminate film a film obtained by laminating a metal foil and a polymer film is generally used.
  • a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
  • the outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used.
  • the metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used.
  • the inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
  • the thickness of the laminate film is not particularly limited, and is preferably 1 ⁇ m or more and 1 mm or less, for example.
  • the substrate 60 may be a so-called rigid substrate or a flexible substrate.
  • a rigid substrate is preferred. This is because when a rigid substrate is used, formation of a dead space and damage to the secondary battery due to the substrate are likely to be a problem, and even when a rigid substrate is used in the present invention, such a problem can be sufficiently avoided.
  • the rigid substrate any rigid substrate used in the field of substrates used with secondary batteries can be used, and examples thereof include a glass / epoxy resin substrate.
  • the substrate examples include an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
  • an electronic circuit substrate such as a printed circuit board
  • a semiconductor substrate such as a silicon wafer
  • a glass substrate such as a display panel.
  • a secondary battery pack is constituted by the protection circuit board and the secondary battery.
  • the secondary battery according to the present invention can be used in various fields where power storage is assumed.
  • the secondary battery according to the present invention particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a smart watch, a laptop computer) in which a mobile device is used.
  • mobile devices such as digital cameras
  • home / small industrial applications eg, power tools, golf carts, home / care / industrial robots
  • large industrial applications eg, forklifts, elevators, bay harbor cranes
  • transportation system field for example, fields such as hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles
  • power system applications for example, various power generation, road conditioners, smart grids, general home-installed types
  • Fields such as power storage systems
  • space and deep sea applications for example, space) ⁇ , it can be used in the field
  • diving research vessel such as diving research vessel.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention concerne une batterie rechargeable qui empêche un déplacement de position mutuelle dû à une vibration ou similaire par rapport à un substrat, en particulier, un substrat disposé sur une partie de gradin inférieur pas formée par une partie de gradin. La présente invention concerne une batterie rechargeable 100A obtenue par scellement, dans un corps extérieur 6, d'un électrolyte et d'un ensemble d'électrodes comprenant une électrode positive, une électrode négative, et un séparateur disposé entre l'électrode positive et l'électrode négative, la batterie rechargeable comportant : une ou plusieurs parties de gradin 15 formées chacune par deux surfaces supérieures 11, 21 ayant des hauteurs mutuellement différentes ; et une partie d'étanchéité sur au moins une surface latérale d'une partie de gradin inférieur 10 ayant une hauteur de la surface supérieure qui est relativement faible. La partie d'étanchéité peut être fléchie dans la direction de l'épaisseur de la batterie rechargeable. Une partie d'étanchéité courbée 50b est formée lorsque ladite partie d'étanchéité est fléchie sert de partie de butée par rapport à un substrat 60A disposé sur la surface supérieure 11 de la partie de gradin inférieur 10.
PCT/JP2017/033556 2016-11-29 2017-09-15 Batterie rechargeable et dispositif WO2018100846A1 (fr)

Applications Claiming Priority (2)

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JP2016-231708 2016-11-29
JP2016231708 2016-11-29

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WO2018100846A1 true WO2018100846A1 (fr) 2018-06-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000156208A (ja) * 1998-11-18 2000-06-06 Sony Corp 非水電解質電池
JP2000285881A (ja) * 1999-03-30 2000-10-13 Kyocera Corp 薄型電池およびその製造方法
JP2001167743A (ja) * 1999-12-09 2001-06-22 Sharp Corp 二次電池及びそれを用いた電子機器
JP2002260608A (ja) * 2001-02-27 2002-09-13 Sanyo Electric Co Ltd パック電池
JP2006093101A (ja) * 2004-09-24 2006-04-06 Samsung Sdi Co Ltd 強度強化層が形成されたリチウムポリマー電池及びその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000156208A (ja) * 1998-11-18 2000-06-06 Sony Corp 非水電解質電池
JP2000285881A (ja) * 1999-03-30 2000-10-13 Kyocera Corp 薄型電池およびその製造方法
JP2001167743A (ja) * 1999-12-09 2001-06-22 Sharp Corp 二次電池及びそれを用いた電子機器
JP2002260608A (ja) * 2001-02-27 2002-09-13 Sanyo Electric Co Ltd パック電池
JP2006093101A (ja) * 2004-09-24 2006-04-06 Samsung Sdi Co Ltd 強度強化層が形成されたリチウムポリマー電池及びその製造方法

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