WO2023007756A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
- Publication number
- WO2023007756A1 WO2023007756A1 PCT/JP2021/035490 JP2021035490W WO2023007756A1 WO 2023007756 A1 WO2023007756 A1 WO 2023007756A1 JP 2021035490 W JP2021035490 W JP 2021035490W WO 2023007756 A1 WO2023007756 A1 WO 2023007756A1
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- WO
- WIPO (PCT)
- Prior art keywords
- base
- current collector
- positive electrode
- external terminal
- secondary battery
- Prior art date
Links
- 239000000470 constituent Substances 0.000 claims abstract description 52
- 238000003860 storage Methods 0.000 claims abstract description 45
- 230000005611 electricity Effects 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 description 31
- 239000011888 foil Substances 0.000 description 26
- 229910052751 metal Inorganic materials 0.000 description 15
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- 238000005520 cutting process Methods 0.000 description 9
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 6
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
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- 229910052744 lithium Inorganic materials 0.000 description 2
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- 238000003466 welding Methods 0.000 description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- OFHQVNFSKOBBGG-UHFFFAOYSA-N 1,2-difluoropropane Chemical compound CC(F)CF OFHQVNFSKOBBGG-UHFFFAOYSA-N 0.000 description 1
- KXJGSNRAQWDDJT-UHFFFAOYSA-N 1-acetyl-5-bromo-2h-indol-3-one Chemical compound BrC1=CC=C2N(C(=O)C)CC(=O)C2=C1 KXJGSNRAQWDDJT-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
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- 229910008484 TiSi Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000004651 carbonic acid esters Chemical class 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
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Images
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
- H01M50/102—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
- 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
- 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
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape 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
- H01M50/172—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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
-
- 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 secondary batteries, and is suitable for application to lithium ion secondary batteries, for example.
- lithium-ion secondary batteries with high energy density have been attracting attention.
- lithium-ion secondary batteries for automobiles are required to have higher energy density and higher safety.
- a lithium-ion secondary battery generally comprises a positive electrode, a negative electrode, and a separator for electrically insulating them, and has a basic configuration in which the positive electrode and the negative electrode are laminated with the separator interposed therebetween.
- Active material layers are usually formed on the positive and negative electrodes by applying a slurry containing an active material capable of intercalating and deintercalating lithium ions onto the surface of a strip-shaped metal foil.
- These positive electrode, negative electrode, and separator are formed, for example, as a wound electrode group in a state of being superimposed on each other, put into a can or a laminated outer package, and sealed in a state impregnated with an electrolytic solution.
- Patent Document 1 As background technology in this technical field.
- the present invention has been made in consideration of the above points, and intends to propose a secondary battery that can be reduced in size and weight while also suppressing heat generation.
- the present invention provides a secondary battery in which a power storage element for charging and discharging electricity is housed in an exterior body, comprising a box body having one open side that constitutes the exterior body, and the box body. an external terminal attached to the lid so that at least a portion of the external terminal is exposed from the lid; and a current collector that electrically connects the power storage element and the external terminal. and the current collector includes a first extending portion electrically connected to the power storage element, and a plate-like plate disposed along the lid and electrically connected to the external terminal.
- the base includes a first base-constituting portion that is a portion continuous from the first extending portion; and a second base-constituting portion that is connected to the external terminal. and a plate thickness of the second base portion forming portion is formed to be thinner than that of the first base portion forming portion.
- the secondary battery of the present invention it is possible to suppress an increase in the electrical resistance of the current path from the current collector to the external terminal, and to suppress heat generation of the current collector. Moreover, since the plate thickness of the second base portion forming portion of the current collector is formed to be thinner than the plate thickness of the first base portion forming portion, the weight of the current collector can be reduced.
- FIG. 1 is a perspective view showing the structure of a secondary battery according to first to fourth embodiments
- FIG. 2 is an exploded perspective view showing the internal configuration of the secondary battery of FIG. 1
- FIG. FIG. 3 is an exploded perspective view showing the configuration of an electricity storage element
- FIG. 2 is a cross-sectional view showing the configuration of a positive current collector plate according to the first embodiment
- FIG. 2 is a cross-sectional view showing the configuration of a positive current collector plate according to the first embodiment
- FIG. 4 is a schematic diagram showing how current flows in the positive current collector plate according to the first embodiment
- FIG. 5 is a cross-sectional view showing the configuration of a positive current collector plate according to a second embodiment
- FIG. 5 is a cross-sectional view showing the configuration of a positive current collector plate according to a second embodiment
- FIG. 11 is a cross-sectional view schematically showing the configuration of a positive current collector plate according to a third embodiment
- FIG. 11 is a cross-sectional view schematically showing the configuration of a positive current collector plate according to a fourth embodiment
- FIGS. 1 and 2 1 indicates a secondary battery according to the present embodiment as a whole.
- This secondary battery is, for example, a flat prismatic lithium-ion secondary battery that is mounted as a power source in an electric vehicle or a hybrid vehicle.
- each part of the secondary battery 1 is described using an xyz orthogonal coordinate system in which the x direction is the width direction of the secondary battery, the y direction is the thickness direction, and the z direction is the height direction.
- the directions of up, down, left and right in the following description are directions for convenience in describing the configuration of each part of the secondary battery 1 based on the drawings, and are not limited to vertical or horizontal directions.
- the secondary battery 1 is configured with a battery container 2 that forms a sealed container and houses a power storage element 5 described later.
- the battery container 2 is, for example, a metal container having a flat rectangular box shape.
- the battery container 2 has a pair of wide side surfaces 3A along the width direction (x direction), a pair of narrow side surfaces 3B along the thickness direction (y direction), and an elongated rectangular top surface 3C and bottom surface 3D. Of these wide side surface 3A, narrow side surface 3B, top surface 3C and bottom surface 3D, wide side surface 3A has the largest area.
- the battery container 2 includes, for example, a battery can 3 that is a flat rectangular box with one side open in the height direction (z direction), and a rectangular plate-shaped battery lid 4 that closes the opening 3E of the battery can 3.
- a battery can 3 that is a flat rectangular box with one side open in the height direction (z direction)
- a rectangular plate-shaped battery lid 4 that closes the opening 3E of the battery can 3.
- the battery can 3 and the battery lid 4 are made of a metal material such as an aluminum alloy, and are formed by deep drawing or press working.
- the circumference of the battery lid 4 is joined around the entire circumference of the opening 3E by laser welding or the like.
- the opening 3E is sealed by the battery cover 4.
- the battery cover 4 has through holes 4A formed at both ends in the longitudinal direction, which is the width direction (x direction) of the secondary battery 1, through which parts of a positive electrode external terminal 7 and a negative electrode external terminal 8, which will be described later, are inserted.
- a gas discharge valve 4B is formed in the central portion in the longitudinal direction.
- the gas discharge valve 4 ⁇ /b>B is formed integrally with the battery lid 4 , for example, by pressing a part of the battery lid 4 to make the thickness thinner and form a slit.
- the battery cover 4 is provided with an injection hole 4C, for example, between the through hole and the gas discharge valve.
- the injection hole 4C is a hole for injecting the electrolyte into the battery lid 4, and is sealed by joining the injection plug 6 by laser welding or the like after the injection of the electrolyte.
- a non-aqueous electrolyte 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. be able to.
- a positive external terminal 7 and a negative external terminal 8 are fixed to the battery lid 4 .
- the positive electrode external terminal 7 and the negative electrode external terminal 8 are spaced apart in the longitudinal direction of the outer surface of the battery lid 4 (upper surface 3C of the battery container 2) and correspond to each other inside the battery container 2 via the battery lid 4. It is electrically and physically connected to the positive electrode collector plate 11 or the negative electrode collector plate 12 .
- the positive electrode external terminal 7 is made of, for example, aluminum or an aluminum alloy
- the negative electrode external terminal 8 is made of, for example, copper or a copper alloy.
- the positive electrode external terminal 7 and the negative electrode external terminal 8 have joint portions 7A and 8A connected to, for example, bus bars, respectively, and connection portions 7B and 8B connected to the positive electrode current collector plate 11 and the negative electrode current collector plate 12, respectively.
- the joint portions 7A and 8A are formed in a substantially rectangular parallelepiped shape and are fixed to the outer surface of the battery cover 4 via gaskets 9 and 10 made of an insulating member.
- the connecting portions 7B and 8B are columnar or cylindrical portions extending in a direction penetrating the battery lid 4 from the bottom surface side of the connecting portions 7A and 8A facing the battery lid 4, and are integrally formed with the connecting portions 7A and 8A. be done.
- the positive collector plate 11 and the negative collector plate 12 are, as shown in FIG.
- the positive current collector plate 11 connects between the positive external terminal 7 and a positive electrode laminate portion 5A described later, which is the positive electrode of the entire storage element 5.
- the negative electrode current collector plate 12 connects the negative external terminal 8 and the storage element 5. It is connected to a negative electrode laminate portion 5B, which is the overall negative electrode and will be described later.
- the positive collector plate 11 is made of, for example, aluminum or an aluminum alloy
- the negative collector plate 12 is made of, for example, copper or a copper alloy.
- the positive electrode current collector plate 11 and the negative electrode current collector plate 12 are bent so as to be positioned along the battery lid 4, respectively, and are connected to the corresponding positive electrode external terminal 7 or negative electrode external terminal 8, respectively.
- Extending portions 11B and 12B extend along the wide side surface 3A of the can 3 toward the bottom surface 3D.
- the joint portions 11BA and 12BA of the extension portions 11B and 12B are connected to the positive electrode laminate portion 5A in which the positive electrode foil exposed portion 23B (FIG. 3) of the storage element 5 is wound and laminated flat, and the negative electrode of the storage element 5. It is bonded to the electrode by ultrasonic bonding or the like.
- FIG. 3 shows a state in which part of the storage element 5 is deployed.
- the electricity storage element 5 is formed by stacking a first separator 20, a negative electrode 21, a second separator 22, and a positive electrode 23, which are formed in strips, in this order, and winding them with the positive electrode 23 on the inside. It is formed in a flat shape by In this case, the first and second separators 20 and 22 are made of an insulating material, so that the negative electrode 21 and the positive electrode 23 are wound in an insulated state.
- the negative electrode 21 includes a negative electrode mixture layer 21A formed by applying a negative electrode active material (negative electrode mixture) to both surfaces of a negative electrode metal foil, which is a negative electrode current collector, and a width direction (x direction) of the negative electrode metal foil. ) and a negative electrode foil exposed portion 21B on which the negative electrode mixture is not applied.
- a negative electrode active material negative electrode mixture
- the negative electrode metal foil is composed of, for example, a copper foil with a thickness of about 10 ⁇ m.
- the negative electrode mixture layer 21A is formed with a thickness of about 70 ⁇ m by applying a negative electrode mixture slurry to a negative electrode metal foil, drying the applied negative electrode mixture, and pressing the applied negative electrode mixture.
- the negative electrode 21 is manufactured by appropriately cutting the negative electrode metal foil on which the negative electrode mixture layer 21A is formed.
- PVDF polyvinylidene fluoride
- NMP N-methylpyrrolidone
- the negative electrode active material contained in the negative electrode mixture layer 21A is not limited to the amorphous carbon described above.
- the negative electrode active material natural graphite capable of intercalating and deintercalating lithium ions, various artificial graphite materials, carbonaceous materials such as coke, compounds such as Si or Sn (e.g., SiO, TiSi 2 , etc.), Alternatively, composite materials of these can be used.
- the particle shape of the negative electrode active material is not particularly limited, and may be, for example, scaly, spherical, fibrous, or lumpy.
- the positive electrode 23 includes a positive electrode mixture layer 23A formed by applying a positive electrode active material (positive electrode mixture) to both surfaces of a positive electrode metal foil, which is a positive electrode current collector, and a width direction of the positive electrode metal foil ( and a positive electrode foil exposed portion 23B on which the positive electrode mixture is not applied and which is provided on the other end side in the x direction).
- a positive electrode active material positive electrode mixture
- the positive electrode metal foil is composed of, for example, an aluminum foil with a thickness of about 20 ⁇ m.
- the positive electrode mixture layer 23A is formed with a thickness of about 90 ⁇ m by applying a slurry positive electrode mixture, drying the applied positive electrode mixture, and pressing the applied positive electrode mixture.
- the positive electrode 23 is manufactured by appropriately cutting the positive electrode metal foil on which the positive electrode mixture layer 23A is formed.
- the positive electrode mixture slurry for example, 10 parts by weight of flake graphite as a conductive material and 10 parts by weight of flaky graphite as a binder are added to 100 parts by weight of lithium manganate (LiMn 2 O 4 ) as the positive electrode mixture. It is possible to use a mixture obtained by adding parts by weight of PVDF, further adding NMP as a dispersing solvent, and kneading them.
- the positive electrode active material contained in the positive electrode mixture layer 23A is not limited to lithium manganate described above.
- the positive electrode active material other lithium manganate having a spinel crystal structure, or a lithium-manganese composite oxide partially substituted or doped with a metal element can be used.
- the positive electrode active material lithium cobalt oxide or lithium titanate having a layered crystal structure, or lithium-metal composite oxide partially substituted or doped with a metal element may be used.
- the binder used for the negative electrode mixture and the positive electrode mixture is not limited to PVDF.
- binders include polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene-butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, Vinylidene fluoride, propylene fluoride, chloroprene fluoride, polymers such as acrylic resins, or mixtures thereof can be used.
- PTFE polytetrafluoroethylene
- polyethylene polystyrene
- polybutadiene butyl rubber
- nitrile rubber styrene-butadiene rubber
- polysulfide rubber nitrocellulose
- cyanoethyl cellulose various latexes
- acrylonitrile vinyl fluoride
- the electricity storage element 5 may have an axial core for laminating and winding the first separator 20, the negative electrode 21, the second separator 22, and the positive electrode 23.
- the shaft core for example, a wound resin sheet having bending rigidity higher than that of the positive electrode metal foil, the negative electrode metal foil, and the first and second separators 20 and 22 can be used.
- the dimension of the negative electrode mixture layer 21A is larger than the dimension of the positive electrode mixture layer 23A in the winding axis 24 direction (x direction), and the positive electrode mixture layer 23A is always between the negative electrode mixture layers 21A. configured to be sandwiched between
- the positive electrode foil exposed portion 23B of the positive electrode 23 and the negative electrode foil exposed portion 21B of the negative electrode 21 are, as shown in FIG. and laminated.
- the exposed positive electrode foil portion 23B and the exposed negative electrode foil portion 21B are flatly bundled, and the corresponding positive electrode current collector plate 11 or negative electrode current collector plate 12 is extended by, for example, ultrasonic bonding or resistance bonding. It is joined to the joining portions 11BA and 12BA of the existing portions 11B and 12B.
- the dimensions of the first and second separators 20 and 22 are larger than the dimensions of the negative electrode mixture layer 21A of the negative electrode 21 in the winding axis 24 direction (x direction). However, the ends of the first and second separators 20 and 22 are positioned in the direction of the winding axis 24 (x direction) more than the ends of the positive electrode foil exposed portion 23B of the positive electrode 23 and the negative electrode foil exposed portion 21B of the negative electrode 21. ) inside the storage element 5 . For this reason, the positive electrode foil exposed portion 23B of the positive electrode 23 and the negative electrode foil exposed portion 21B of the negative electrode 21 are respectively bundled, and the joint portion 11BA of the extension portion 11B of the positive electrode current collector plate 11 and the extension of the negative electrode current collector plate 12 are respectively bundled. The first and second separators 20 and 22 do not interfere with joining to the joining portion 12BA of the existing portion 12B.
- the base portion 11A of the positive electrode current collector plate 11 and the base portion 12A of the negative electrode current collector plate 12 are fixed to the battery lid 4 via plate-like insulating members 13 and 14, respectively, and the corresponding positive electrode external terminal 7 or negative electrode external terminal 8 is connected. It is connected to the. More specifically, the connection portion 7B of the positive electrode external terminal 7 and the connection portion 8B of the negative electrode external terminal 8 are formed by, for example, the through holes 9A and 10A of the gaskets 9 and 10, the through hole 4A of the battery lid 4, the insulating member 13, 14 through-holes 13A and 14A and through-holes 11AA and 12AA of the corresponding base portions 11A and 12A of the positive electrode current collector plate 11 and the negative electrode current collector plate 12, respectively.
- the lower surfaces of the base portions 11A and 12A are crimped so as to be plastically deformed so as to expand the diameter of the tip.
- the positive electrode external terminal 7 and the positive current collector plate 11 are electrically connected to each other
- the negative electrode external terminal 8 and the negative electrode current collector plate 12 are electrically connected to each other.
- the negative electrode external terminal 8 and the negative electrode collector plate 12 are fixed to the battery cover 4 in a state of being electrically insulated via gaskets 9 and 10 and insulating members 13 and 14, respectively.
- joint portion 11BA of the extension portion 11B of the positive electrode current collector plate 11 and the joint portion 12BA of the extension portion 12B of the negative electrode current collector plate 12 are each a positive electrode formed by laminating the positive electrode foil exposed portion 23B of the storage element 5.
- the positive electrode 23 and the negative electrode 21 constituting the electricity storage element 5 are connected to the corresponding positive electrode current collector plate 11.
- it is electrically connected to the corresponding positive electrode external terminal 7 or negative electrode external terminal 8 via the negative electrode current collector plate 12 .
- Gaskets 9 and 10 and insulating members 13 and 14 are made of an electrically insulating resin such as polybutylene terephthalate, polyphenylene sulfide, perfluoroalkoxy fluorine resin, or the like.
- the storage element 5 is joined to the positive electrode current collector plate 11 and the negative electrode current collector plate 12, respectively, and is electrically insulated while being fixed to the battery lid 4 via the corresponding positive electrode current collector plate 11 or negative electrode current collector plate 12. It is covered with an insulating resin cover 15 (FIG. 2) provided therein, and loaded into the battery can 3 through the opening 3E of the battery can 3 .
- the insulating cover 15 is made by assembling a single sheet or a plurality of film members made of synthetic resin such as polypropylene.
- the insulating cover 15 has dimensions and dimensions that allow it to integrally cover substantially the entire power storage element 5 to which the positive electrode current collector plate 11 and the negative electrode current collector plate 12 are joined together with the positive electrode current collector plate 11 and the negative electrode current collector plate 12 . have a shape.
- the electricity storage element 5 is flatly wound, and has semi-cylindrical curved portions 5C provided at both ends in the height direction (z direction) of the battery container 2. It has a flat flat portion 5D between the curved portions 5C.
- the power storage element 5 is loaded into the battery can 3 from one curved portion 5C so that the direction of the winding axis 24 is along the width direction (x direction) of the secondary battery 1, and the other curved portion 5C is the battery lid. It is accommodated in the battery can 3 so as to face 4 .
- the battery container 2 is configured by bonding the battery cover 4 along the entire circumference of the opening 3E of the battery can 3 as described above, and the electrolyte is injected into the battery container 2 through the injection hole 4C.
- the battery container 2 is sealed by injecting the liquid and joining the liquid injection plug 6 to the liquid injection hole 4C.
- the secondary battery 1 is connected to the positive electrode 23 and the negative electrode 21 of the storage element 5 via the positive external terminal 7 and the positive collector plate 11, and the negative external terminal 8 and the negative collector plate 12, respectively. Electric power is supplied to charge the electricity storage element 5, and the positive electrode current collector plate 11 and the positive electrode external terminal 7 and the negative electrode current collector plate 12 and the negative electrode external terminal 8 are transferred from the positive electrode 23 and the negative electrode 21 of the electricity storage element 5. Power can be output to the outside through the
- the negative electrode current collector plate 12 also has the same configuration as the positive electrode current collector plate 11, and the relationship between the positive electrode current collector plate 11 and the positive electrode external terminal 7 and the relationship between the negative electrode current collector plate 12 and the negative electrode external terminal 8 are the same, the description of the negative electrode current collector plate 12 is omitted.
- FIG. 4 and 5 show the state in which the positive current collecting plate 11 and the positive external terminal 7 of the secondary battery 1 are connected.
- FIG. 4 shows a cross section of the positive electrode current collector plate 11 and the positive electrode external terminal 7 in a plane parallel to the xz plane when the positive electrode external terminal 7 is connected to the positive electrode current collector plate 11.
- FIG. 5 shows a cross section of the positive electrode current collector plate 11 and the positive electrode external terminal 7 in this state on a plane parallel to the yz plane.
- the positive electrode current collector plate 11 extends toward the bottom surface 3D along the wide side surface 3A of the battery can 3 and the base portion 11A that is bent so as to face the battery lid 4 in parallel. Extending portion 11B.
- the base portion 11A of the positive electrode current collector plate 11 includes a first base-constituting portion C1, which constitutes one longitudinal end side of the base portion 11A and is continuous with the extension portion 11B, and the other longitudinal end side of the base portion 11A.
- a third base configuration that is a configuration part of the second base configuration portion C2 to which the positive electrode external terminal 7 is connected and the base portion 11A between the first base configuration portion C1 and the second base configuration portion C2 and C3.
- the thickness of the first base constituent portion C1 is the same as the thickness of the extension portion 11B.
- the second base constituent portion C2 is formed by pressing, cutting, or the like in a direction from the first base constituent portion C1 to the second base constituent portion C2 (that is, the base portion 11A of the positive electrode current collector plate 11 It is characterized in that it is formed (thinned) thinner than the first base constituent portion C1 over the entire length (longitudinal direction).
- the surface (lower surface) facing the electricity storage element 5 of the second base constituent portion C2 is farther away from the electricity storage element 5 than the surface (lower surface) facing the electricity storage element 5 in the first base constituent portion C1. It is thinned so that it is positioned in the direction of For this reason, the lower surface side of the third base portion C3 is tapered from the first base portion C1 toward the second base portion C2.
- the thickness of the entire second base portion forming portion C2 of the positive electrode current collector plate 11 is made thinner than that of the first base portion forming portion C2. internal capacitance can be reduced, thereby making it possible to make the device more compact than before.
- the second base component C2 when the thickness of the second base component C2 is reduced by pressing, the second base component C2 extends in a direction perpendicular to the pressing direction, so it is necessary to cut off the excess. By cutting the surplus portion in this manner, the weight of the positive electrode current collector plate 11 and, in turn, the secondary battery 1 as a whole can be reduced. Further, even when the second base portion forming portion C2 is formed by cutting, the weight of the positive electrode current collector plate 11 and thus the entire secondary battery 1 can naturally be reduced.
- FIG. 6 schematically shows the state of current flowing between the positive collector plate 11 and the positive external terminal 7 with arrows.
- the direction of the current flowing between the negative electrode collector plate 12 and the negative electrode external terminal 8 is opposite to that in FIG. 6, but the current path is the same.
- the second base constituent portion C2 is thinner than the first base constituent portion C1 in the base portion 11A of the positive electrode current collector plate 11, the thickness of the second base constituent portion C2 is reduced accordingly. is the same thickness as the first base portion forming portion C1, the current path flowing from the crimped portion 7BA of the positive electrode external terminal 7 to the positive electrode external terminal 7 is shortened. As a result, it is possible to suppress an increase in the electrical resistance of the current path from the positive current collector plate 11 to the positive electrode external terminal 7, and it is possible to suppress the heat generation of the positive current collector plate 11 as well.
- the thickness of the second base constituent portion C2 is set at a ratio of the thickness of the first base constituent portion C1 to the thickness of the second base constituent portion C2 of 5:2 or more. It was confirmed that the heat generation suppressing effect was enhanced by setting the ratio to 5:3 or less.
- the volume and weight of the positive electrode current collecting plate 11 and the negative electrode current collecting plate 12 of the secondary battery 1 can be effectively reduced, so that the size and weight can be reduced more than before.
- the second base constituent portion C2 of the base portion 11A of the positive electrode current collector 11 is formed thicker than the second base constituent portion C2 of the base portion 12A of the negative electrode current collector plate 12.
- the resistivity of aluminum or an aluminum alloy, which is the material of the positive electrode current collector plate 11 is higher than the resistivity of copper or a copper alloy, which is the material of the negative electrode current collector plate 12, so that the base portion 11A of the positive electrode current collector plate 11
- FIGS. 7 and 8 in which parts corresponding to those in FIG. 2 shows a positive current collector plate 30 according to a second embodiment applied to the secondary battery 1 described above with reference to FIGS. 1 to 3.
- FIG. FIG. 7 shows a cross section of the positive electrode current collector plate 30 and the positive electrode external terminal 7 in a plane parallel to the xz plane when the positive electrode external terminal 7 is connected to the positive electrode current collector plate 30 of the present embodiment.
- 8 shows the cross section of the positive electrode current collector plate 30 and the positive electrode external terminal 7 in this state on a plane parallel to the yz plane.
- the positive electrode current collector plate 30 of the present embodiment includes a base portion 30A that is bent so as to face the battery lid 4 in parallel, and a base portion 30A that extends in the direction of the bottom surface 3D along the wide side surface 3A of the battery can 3 described above with reference to FIG. It has the same configuration as the positive electrode current collector plate 11 of the first embodiment in that it is composed of an extension portion 30B that extends in a downward direction.
- the base portion 30A of the positive electrode current collector plate 30 constitutes one end side in the longitudinal direction of the base portion 30A and is a portion that is continuous with the extension portion 30B.
- It is composed of a third base component portion C12 which is a component portion of the base portion 30A between the component portions C11.
- the first base constituent portion C10 is formed to have the same thickness as the extension portion 30B, whereas the second base constituent portion C11 is formed by pressing or cutting. It is formed thinner than the first base constituent portion C10 by processing or the like. For this reason, the lower surface side of the third base component C12 is tapered from the first base component C10 toward the second base component C11.
- a rib 30AA projecting in a direction away from the battery lid 4 is provided on the lower surface side of the second base constituent portion C11 of the positive current collector plate 30, along each end side in the width direction (y direction) of the second base constituent portion C11.
- the height of the rib 30AA is selected to be the same height as the difference between the thickness of the first base component C10 and the thickness of the second base component C11. Any height can be applied as the height of .
- the second base constituent portion C11 of the base portion 30A is thinner than the first base constituent portion C10. Deformation can be suppressed by the ribs 30AA, so that the connecting portion 7B of the positive electrode external terminal 7 is plastically deformed on the lower surface of the base portion 30A so as to expand the diameter of the tip of the second base portion C11. deformation can be effectively prevented.
- FIG. 9 is an enlarged cross-sectional view of the positive electrode current collector plate 40 and the positive electrode external terminal 7 on a plane parallel to the xz plane in a state in which the positive electrode external terminal 7 is connected to the positive electrode current collector plate 40 of the present embodiment. It is a diagram of
- the positive electrode current collector plate 40 of the present embodiment includes a base portion 40A that is bent so as to face the battery lid 4 in parallel, and an extension that extends along the wide side surface 3A of the battery can 3 toward the bottom surface 3D. It has the same configuration as the positive electrode current collector plate 11 of the first embodiment in that it is composed of the existing portion 40B.
- the base portion 40A of the present positive electrode current collector plate 40 includes a first base portion forming portion C20 which constitutes one end side in the longitudinal direction of the base portion 40A and which is continuous with the extension portion 40B, and the other portion in the longitudinal direction of the base portion 40A. It is composed only of the second base portion forming portion C21 that constitutes the end side and to which the positive electrode external terminal 7 is connected. That is, the boundary between the first base constituent portion C20 and the second base constituent portion C21 has an inclination angle of 90 degrees connecting the lower surface of the first base constituent portion C20 and the lower surface of the second base constituent portion C21. The slope is 40C.
- the base portion 40A of the positive electrode current collector plate 40 is configured in this way, it is difficult to form the slope 40C when thinning the second base portion forming portion C21 by press working.
- the second base portion forming portion C21 is formed, and the slope 40C is formed at this time.
- FIG. 10 shows a partial configuration of a positive electrode current collector plate 50 according to a fourth embodiment applied to the secondary battery 1 described above with reference to FIGS.
- FIG. 10 is an enlarged cross-sectional view of the positive electrode current collector plate 50 and the positive electrode external terminal 7 on a plane parallel to the xz plane in the state where the positive electrode external terminal 7 is connected to the positive electrode current collector plate 50 of the present embodiment. It is a diagram of
- the positive electrode current collector plate 50 of the present embodiment includes a base portion 50A that is bent so as to face the battery lid 4 in parallel, and an extension that extends along the wide side surface 3A of the battery can 3 toward the bottom surface 3D. It has the same configuration as that of the positive electrode current collector plate 11 of the first embodiment in that it is composed of the existing portion 50B.
- the base portion 50A of the positive electrode current collector plate 50 includes a first base portion forming portion C30, which constitutes one end side in the longitudinal direction of the base portion 50A and is continuous with the extension portion 50B, and the other end side in the longitudinal direction of the base portion 50A.
- the positive electrode current collector plate 11 of the first embodiment is also configured from the component C32.
- the third base-constituting portion C32 is not an inclined surface, but the lower surface of the first base-constituting portion C30 and the lower surface of the second base-constituting portion C31. It is characterized in that it is formed into a connecting curved surface.
- the present invention is applied to a prismatic secondary battery configured as shown in FIGS. 1 to 3.
- the present invention is not limited to this, and can be widely applied to secondary batteries having various configurations.
- the current collector (positive electrode current collector plate 11) electrically connecting between the positive electrode laminate portion 5A of the storage element 5 and the positive electrode external terminal 7, and the storage element 5 and the current collector (negative electrode current collector plate 12) electrically connecting between the negative electrode laminate portion 5B and the negative electrode external terminal 8 are formed by bending a plate-like member.
- the present invention is not limited to this, and it is possible to electrically connect between the positive electrode laminate portion 5A of the storage element 5 and the positive electrode external terminal 7, and between the negative electrode laminate portion 5B of the storage element 5 and the negative electrode external terminal 8. , various other configurations can be widely applied as the configuration of the current collector.
- the rib 30AA is provided on the lower surface side of the second base portion forming portion C11 of the base portion 30A of the positive electrode current collector plate 30 has been described.
- the rib 30AA may be provided on the upper surface side of the second base portion C11 so as to protrude in the direction of approaching the battery lid 4 .
- rib 30AA is provided only on the lower surface side of the second base portion forming portion C11 of the base portion 30A of the positive electrode current collector plate 30 has been described.
- ribs integrated with the ribs 30AA may also be formed on the lower surfaces of the third base constituent portion C12 and/or the first base constituent portion C10.
- the ribs 30AA are provided at both ends in the width direction of the lower surface of the second base portion forming portion C11 of the base portion 30A of the positive electrode current collector plate 30 .
- the present invention is not limited to this, and the rib 30AA may be provided only on one end side in the width direction of the lower surface of the second base component portion C11. Further, the rib 30AA may be provided at a location other than the end in the width direction on the lower surface of the second base portion C11 and at a location that does not interfere with the connection of the positive electrode external terminal 7.
- the present invention can be widely applied to prismatic secondary batteries and other forms of secondary batteries.
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Abstract
Description
(1-1)本実施の形態による二次電池の構成
図1及び図2において、1は全体として本実施の形態による二次電池を示す。この二次電池は、例えば、電気自動車やハイブリッド自動車に電力源として搭載される扁平角形のリチウムイオン二次電池である。
次に、本二次電池1における正極集電板11の詳細構成について説明する。なお、負極集電板12も正極集電板11と同様の構成を有し、正極集電板11及び正極外部端子7間の関係と、負極集電板12及び負極外部端子8間の関係とは同じであるため、負極集電板12の説明については省略する。
図4との対応部分に同一符号を付した図7及び図8は、図4及び図5について上述した第1の実施の形態の正極集電板11に代えて図1~図3について上述した二次電池1に適用される第2の実施の形態による正極集電板30を示す。図7は、本実施の形態の正極集電板30に正極外部端子7が接続された状態での正極集電板30及び正極外部端子7のxz平面と平行な平面での断面を示し、図8は、かかる状態での正極集電板30及び正極外部端子7のyz平面と平行な平面での断面を示す。
図4との対応部分に同一符号を付した図9は、図4及び図5について上述した第1の実施の形態の正極集電板11に代えて図1~図3について上述した二次電池1に適用される第3の実施の形態による正極集電板40の一部の構成を示す。図9は、本実施の形態の正極集電板40に正極外部端子7が接続された状態での正極集電板40及び正極外部端子7のxz平面と平行な平面での断面部分を拡大表示した図である。
図4との対応部分に同一符号を付した図10は、図4及び図5について上述した第1の実施の形態の正極集電板11に代えて図1~図3について上述した二次電池1に適用される第4の実施の形態による正極集電板50の一部の構成を示す。図10は、本実施の形態の正極集電板50に正極外部端子7が接続された状態での正極集電板50及び正極外部端子7のxz平面と平行な平面での断面部分を拡大表示した図である。
なお上述の第1~第4の実施の形態においては、本発明を図1~図3のように構成された角形二次電池に適用するようにした場合について述べたが、本発明はこれに限らず、この他種々の構成の二次電池に広く適用することができる。
Claims (9)
- 電気を充放電する蓄電要素が外装体に収容された二次電池において、
前記外装体を構成し、一面側が開放された箱体、及び、当該箱体の前記一面側を閉塞する蓋と、
少なくとも一部が前記蓋から外部に露出するように前記蓋に取り付けられた外部端子と、
前記蓄電要素及び前記外部端子間を電気的に接続する集電体と
を有し、
前記集電体は、
前記蓄電要素と電気的に接続された第1の延在部と、
前記蓋に沿って配置され、前記外部端子と電気的に接続された板状の第2の基部と
を有し、
前記基部は、
前記基部の長手方向の一端側を形成し、前記第1の延在部から連続する部位である第1の基部構成部と、
前記基部の前記長手方向の他端側を形成し、前記外部端子と接続される第2の基部構成部と
を備え、
前記第2の基部構成部が前記第1の基部構成部よりも板厚が薄く形成された
ことを特徴とする二次電池。 - 前記第2の基部構成部は、
前記基部の前記長手方向の全域において、前記第1の基部構成部よりも薄く形成された
ことを特徴とする請求項1に記載の二次電池。 - 前記第2の基部構成部は、
前記蓄電要素との対向面が、前記第1の基部構成部における前記蓄電要素との対向面よりも前記蓄電池要素から離反する方向に位置するように薄肉化された
ことを特徴とする請求項1に記載の二次電池。 - 前記第2の基部構成部における前記蓋と対向する第1の面又は当該第1の面と反対側の第2の面の幅方向の少なくとも一端側に、前記蓋に近接し又は前記蓋から離反する方向に突出するリブが設けられた
ことを特徴とする請求項1に記載の二次電池。 - 前記第1の基部構成部の板厚と、前記第2の基部構成部の板厚との比が5:2以上で5:3以下である
ことを特徴とする請求項4に記載の二次電池。 - 前記基部の前記第1の基部構成部及び前記第2の基部構成部間に設けられ、少なくとも一面側が、前記第1の基部構成部から前記第2の基部構成部に向けて傾斜するテーパ状に形成された第3の基部構成部を備える
ことを特徴とする請求項1に記載の二次電池。 - 前記第1の基部構成部の一面側及び前記第2の基部構成部の一面側が傾斜角90度の傾斜面により接続された
ことを特徴とする請求項1に記載の二次電池。 - 前記基部の前記第1の基部構成部及び前記第2の基部構成部間に設けられ、少なくとも一面側が前記第1の基部構成部の一面と、前記第2の基部構成部の一面とを接続する曲面状に形成された第3の基部構成部を備える
ことを特徴とする請求項1に記載の二次電池。 - 前記集電体は、
前記蓄電要素の正極電極に接続された正極集電体と、前記蓄電要素の負極電極に接続された負極集電体とを有し、
前記外部端子は、
前記正極集電体に接続された正極外部端子及び前記負極集電体に接続された負極外部端子を有し、
前記正極集電体における前記基部の前記第2の基部構成部の板厚は、前記負極集電体における前記基部の前記第2の基部構成部の板厚よりも厚い
ことを特徴とする請求項1乃至6に記載の二次電池。
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JP2019061892A (ja) * | 2017-09-27 | 2019-04-18 | 株式会社Gsユアサ | 蓄電素子 |
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2021
- 2021-09-28 EP EP21951129.2A patent/EP4379878A1/en active Pending
- 2021-09-28 JP JP2023538209A patent/JPWO2023007756A1/ja active Pending
- 2021-09-28 WO PCT/JP2021/035490 patent/WO2023007756A1/ja active Application Filing
- 2021-09-28 CN CN202180097122.5A patent/CN117157822A/zh active Pending
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JP2013137991A (ja) * | 2011-11-29 | 2013-07-11 | Gs Yuasa Corp | 蓄電素子および蓄電素子の製造方法 |
JP2016189246A (ja) | 2015-03-30 | 2016-11-04 | 三洋電機株式会社 | 角形二次電池 |
JP2019061892A (ja) * | 2017-09-27 | 2019-04-18 | 株式会社Gsユアサ | 蓄電素子 |
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CN117157822A (zh) | 2023-12-01 |
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