WO2016185867A1 - 角形二次電池 - Google Patents
角形二次電池 Download PDFInfo
- Publication number
- WO2016185867A1 WO2016185867A1 PCT/JP2016/062692 JP2016062692W WO2016185867A1 WO 2016185867 A1 WO2016185867 A1 WO 2016185867A1 JP 2016062692 W JP2016062692 W JP 2016062692W WO 2016185867 A1 WO2016185867 A1 WO 2016185867A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- cleavage valve
- battery lid
- secondary battery
- positive electrode
- Prior art date
Links
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Images
Classifications
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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
- H01M10/049—Processes for forming or storing electrodes in the battery container
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—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
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/157—Inorganic material
- H01M50/159—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/469—Separators, membranes or diaphragms characterised by their shape tubular or cylindrical
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- 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 rectangular secondary battery having a gas discharge valve.
- a wound electrode group as a power generation element is housed in a battery can made of a metal such as aluminum, and an electrolyte is injected.
- the battery can has a peripheral side surface and a bottom surface, and an upper surface is opened.
- the peripheral side surface is usually formed in a rectangular cross section having a pair of wide side surfaces and a pair of narrow side surfaces connected to the wide side surfaces.
- the upper opening of the battery can is sealed by the battery lid provided with the positive and negative external terminals after the wound group is accommodated, and the electrolyte is injected into the battery can from the injection hole of the battery lid.
- the battery lid is insulated from the positive and negative external terminals.
- the battery can and the battery lid are neutral with no potential and different in potential from the positive electrode or the negative electrode.
- the battery lid is provided with a cleavage valve.
- the cleavage valve cleaves when the internal pressure of the battery can increases, thereby discharging gas in the battery can and reducing the internal pressure.
- stabilizing gas discharge by the cleavage valve By stabilizing gas discharge by the cleavage valve, the safety of the battery can be enhanced.
- a technique has been proposed in which an insulator having a plurality of openings serving as gas flow paths is provided between the battery lid and the cleavage valve and the wound group so as to cover the cleavage valve. (Patent Document 1).
- the gas can be stably discharged when gas is generated in a state where the battery lid is not deformed.
- an insulator having a plurality of openings serving as gas flow paths is pressed against the winding group, and most of the plurality of openings serving as gas flow paths Will be blocked by the winding group, so the gas will not flow.
- the battery lid is deformed to the winding group side and the battery lid cleavage valve contacts the winding group Moreover, the cleavage valve is blocked by the wound group, and the gas cannot be discharged.
- Such deformation of the battery lid occurs, for example, when the battery is compressed from the lid side.
- the battery lid is particularly susceptible to deformation around the cleavage valve and the injection port.
- a gas exhaust duct is connected to the cleavage valve provided at the center of the battery lid. Therefore, when the module is deformed due to an accident or the like, there is a high possibility that the battery cover is deformed through the gas discharge duct.
- the present invention has been made in view of the above points.
- the object of the present invention is to provide a prismatic two that can stably discharge gas from the cleavage valve even when the battery cover is deformed to the winding group side.
- the next battery is to provide.
- a curved surface portion of a flat wound group is arranged on the opening side of a battery can, and the opening is sealed with a battery lid having a cleavage valve and a liquid injection port.
- a prismatic secondary battery having a convex portion disposed on the battery lid between at least the liquid injection port and the cleavage valve, and having a facing surface positioned on the curved surface side of the cleavage valve.
- the opposing surface of the convex portion comes into contact with the curved surface portion of the winding group, so that the cleavage valve is blocked by the winding group. Can be prevented. Therefore, a gas flow path from the gas ejection portion of the flat wound group to the cleavage valve is secured, and gas can be discharged stably from the cleavage valve.
- FIG. 3 is a perspective view illustrating the internal structure of the prismatic secondary battery in Example 1.
- FIG. 3 illustrates a structure of an insulating plate in Example 1.
- FIG. 6 illustrates a structure of an insulating plate in Example 2.
- FIG. 6 is a diagram illustrating the structure of an insulating plate in Example 3.
- FIG. 6 is a diagram illustrating a structure of an insulating plate in Example 4.
- 6A and 6B illustrate a structure of a battery lid in Embodiment 5.
- FIG. 1 is an external perspective view of a prismatic secondary battery
- FIG. 2 is an exploded perspective view of the prismatic secondary battery.
- the prismatic secondary battery 100 includes a metal battery can 1 and a battery lid 8.
- the battery can 1 includes a rectangular bottom surface 12 having a pair of long side portions and a pair of short side portions, and a pair of opposed wide side surfaces 13 having a relatively large area continuously from the pair of long side portions of the bottom surface 12. And a pair of opposed narrow side surfaces 14 having a relatively small area continuously with the pair of short sides of the bottom surface 12, and an opening 11 is formed in the upper portion facing the bottom surface 12. Yes.
- a flat wound group 3 is accommodated, and the opening 11 of the battery can 1 is sealed by a battery lid 8.
- the battery lid 8 has a substantially rectangular flat plate shape in a plan view and has a size for closing the opening 11, and the peripheral edge of the battery lid 8 is welded to the opening edge of the opening 11.
- the battery lid 8 is provided with a positive terminal 7A and a negative terminal 7B which are external terminals, and is charged to the flat wound group 3 via the positive terminal 7A and the negative terminal 7B, and power is supplied to the external load. Is done.
- the positive electrode terminal 7 ⁇ / b> A and the negative electrode terminal 7 ⁇ / b> B are arranged separately on one side and the other side in the longitudinal direction of the battery lid 8.
- the battery lid 8 is integrally provided with a cleavage valve 81.
- the cleavage valve 81 is cleaved and the gas in the battery can 1 is discharged, and the pressure in the battery can 1 is reduced. Thereby, the safety of the prismatic secondary battery 100 is ensured.
- the cleavage valve 81 is disposed at the center of the battery lid 8 in the longitudinal direction.
- a flat wound group 3 is accommodated via an insulating protective film 2. Since the flat wound group 3 is wound in a flat shape, the flat wound group 3 has a pair of opposed curved surface portions having a semicircular cross section and a flat surface portion formed continuously between the pair of curved surface portions. is doing.
- the flat wound group 3 is inserted into the battery can 1 from one curved surface portion side so that the winding axis direction is along the lateral width direction of the battery can 1, and the other curved surface portion side is disposed on the opening 11 side.
- the positive electrode metal foil exposed portion 34c of the flat wound group 3 is electrically connected to the positive electrode terminal 7A through the positive electrode current collector plate 4A.
- the negative electrode metal foil exposed portion 32c of the flat wound group 3 is electrically connected to the negative electrode terminal 7B through the negative electrode current collector plate 4B.
- the gasket 6, the positive electrode insulating plate 5A, and the negative electrode insulating plate 5B are batteries.
- the lid 8 is provided.
- the material for forming the positive electrode terminal 7A and the positive electrode current collector plate 4A include an aluminum alloy
- examples of the material for forming the negative electrode terminal 7B and the negative electrode current collector plate 4B include a copper alloy.
- the material for forming the gasket 6 include resin materials having insulating properties such as polybutylene terephthalate, polyphenylene sulfide, and perfluoroalkoxy fluororesin.
- the battery lid 8 is provided with a liquid injection port 82 for injecting an electrolytic solution into the battery can 1.
- the liquid injection port 82 is located between the positive electrode terminal 7 ⁇ / b> A and the cleavage valve 81.
- the injection port 82 is sealed with an injection plug 83 after injecting the electrolyte into the battery can 1.
- a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate-based organic solvent such as ethylene carbonate. can be applied.
- the positive terminal 7A and the negative terminal 7B have rectangular terminal heads 71A and 71B that are exposed to the outside and welded to a bus bar or the like.
- Shaft portions 73A and 73B are provided to protrude from the lower surfaces of the terminal head portions 71A and 71B, respectively.
- the shaft portions 73A and 73B are inserted into the openings 8A and 8B of the battery lid 8 so that the battery can 1 is more than the positive electrode current collector plate base 41A and the negative electrode current collector plate base 41B of the positive electrode current collector plate 4A and the negative electrode current collector plate 4B.
- the positive electrode terminal 7A, the negative electrode terminal 7B, the positive electrode current collector plate 4A, and the negative electrode current collector plate 4B are integrally fixed to the battery lid 8.
- Gaskets 6 are interposed between the positive electrode terminal 7A and the battery cover 8, and between the negative electrode terminal 7B and the battery cover 8, respectively, between the positive electrode current collector plate 4A and the battery cover 8, and the negative electrode current collector.
- a positive electrode insulating plate 5A and a negative electrode insulating plate 5B are interposed between the electric plate 4B and the battery cover 8, respectively.
- the positive electrode current collector plate 4A and the negative electrode current collector plate 4B are a rectangular plate-shaped positive electrode current collector plate base portion 41A, a negative electrode current collector plate base portion 41B, and a positive electrode current collector plate, which are arranged in parallel to face the lower surface of the battery lid 8. Bent at the side end of the base portion 41A and the negative electrode current collector base portion 41B, and extends toward the bottom surface 12 along the wide side surface 13 of the battery can 1 to expose the positive electrode metal foil exposed portion 34c of the wound group 3; It has a positive electrode side connection end portion 42A and a negative electrode side connection end portion 42B connected to the metal foil exposed portion 32c.
- the positive electrode collector plate base 41A and the negative electrode collector plate base 41B are respectively formed with a positive electrode side opening hole 43A and a negative electrode side opening hole 43B through which the shaft portions 73A and 73B are inserted.
- the insulating protective film 2 is wound around the flat wound group 3 with the direction along the flat plane of the flat wound group 3 and the direction perpendicular to the winding axis direction of the flat wound group 3 as the central axis direction.
- the insulating protective film 2 is made of, for example, a single sheet made of synthetic resin such as PP (polypropylene) or a plurality of film members, and is parallel to the flat surface of the flat wound group 3 and orthogonal to the winding axis direction. It has a length that can be wound around the direction as the winding center.
- FIG. 3 is an exploded perspective view showing a state in which a part of the wound group in Example 1 is developed.
- the flat wound group 3 is configured by winding the negative electrode 32 and the positive electrode 34 in a flat shape with separators 33 and 35 interposed therebetween.
- the outermost electrode is the negative electrode 32, and the separators 33 and 35 are wound outside thereof.
- the separators 33 and 35 have a role of insulating between the positive electrode 34 and the negative electrode 32.
- the portion where the negative electrode mixture layer 32b of the negative electrode 32 is applied is larger in the width direction than the portion of the positive electrode 34 where the positive electrode mixture layer 34b is applied, so that the portion where the positive electrode mixture layer 34b is applied is
- the negative electrode mixture layer 32b is always sandwiched between the coated portions.
- the positive electrode metal foil exposed portion 34c and the negative electrode metal foil exposed portion 32c are bundled at a plane portion and connected by welding or the like.
- the separators 33 and 35 are wider than the portion where the negative electrode mixture layer 32b is applied in the width direction, but at positions where the metal foil surface at the end is exposed at the positive metal foil exposed portion 34c and the negative metal foil exposed portion 32c. Because it is wound, it does not hinder bundled welding.
- the positive electrode 34 has a positive electrode mixture layer 34b coated with a positive electrode active material mixture on both sides of the positive electrode metal foil, and the positive electrode active material mixture is applied to one end in the width direction of the positive electrode metal foil.
- a positive electrode metal foil exposed portion 34c that is not processed is provided.
- the negative electrode 32 has a negative electrode mixture layer 32b coated with a negative electrode active material mixture on both sides of the negative electrode metal foil, and a negative electrode active material mixture is applied to the other end in the width direction of the negative electrode metal foil.
- An unexposed negative electrode metal foil exposed portion 32c is provided.
- the positive metal foil exposed portion 34c and the negative metal foil exposed portion 32c are regions where the foil surface of the metal foil is exposed, and are wound so as to be disposed at one side and the other side in the winding axis direction.
- negative electrode 32 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) is added as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and N as a dispersion solvent.
- NMP kneading methylpyrrolidone
- amorphous carbon is used as the negative electrode active material
- the present invention is not limited to this, and natural graphite capable of inserting and removing lithium ions and various artificial graphite materials , Carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or composite materials thereof may be used. It is not limited.
- the positive electrode 34 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder are added to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material.
- a positive electrode mixture was prepared by adding and kneading NMP as a dispersion solvent. The positive electrode mixture was applied to both surfaces of an aluminum foil (positive metal foil) having a thickness of 20 ⁇ m leaving a welded portion (positive electrode uncoated portion). Thereafter, a positive electrode 34 having a thickness of 90 ⁇ m in the thickness of the positive electrode active material coating portion not including an aluminum foil was obtained through drying, pressing, and cutting processes.
- lithium manganate is used as the positive electrode active material
- other lithium manganate having a spinel crystal structure or a lithium manganese composite oxide or layered in which a part is substituted or doped with a metal element A lithium cobalt oxide or lithium titanate having a crystal structure, or a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used.
- PVDF polytetrafluoroethylene
- polyethylene polyethylene
- polystyrene polybutadiene
- butyl rubber nitrile rubber
- styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof.
- a shaft core what was comprised by winding the resin sheet whose bending rigidity is higher than any of positive electrode metal foil, negative electrode metal foil, and separators 33 and 35 can be used, for example.
- FIG. 4 is a perspective view for explaining the internal structure of the prismatic secondary battery in the first embodiment
- FIG. 5 is a view for explaining the structure of the insulating plate in the first embodiment
- 5A is a perspective view of the positive electrode insulating plate and the negative electrode insulating plate
- FIG. 5B is a cross-sectional view taken along the line AA in FIG.
- the positive electrode insulating plate 5A and the negative electrode insulating plate 5B have a shape extended toward the direction of the cleavage valve 81 of the battery lid 8, and have convex portions 54A, 55A facing the curved surface portion 3a of the flat wound group 3. 54B.
- the positive electrode insulating plate 5 ⁇ / b> A has a base end interposed between the battery lid 8 and the positive electrode current collector plate 4 ⁇ / b> A, extends along the battery lid 8 toward the longitudinal center of the battery lid 8, The tip is disposed at a position adjacent to the cleavage valve 10.
- the negative electrode insulating plate 5B has a proximal end interposed between the battery lid 8 and the negative electrode current collector plate 4B, extends along the battery lid 8 toward the longitudinal center of the battery lid 8, and has a distal end at the cleavage valve 81. It is arrange
- the positive electrode insulating plate 5A has a rectangular flat plate portion 51A extending along the battery lid 8, as shown in FIG.
- the flat plate portion 51 ⁇ / b> A is formed with a terminal opening 52 ⁇ / b> A for inserting the shaft portion 73 ⁇ / b> A of the positive electrode terminal 7 ⁇ / b> A and a liquid injection opening 53 ⁇ / b> A communicating with the liquid injection port 82 of the battery lid 8.
- the positive electrode insulating plate 5A is provided with convex portions 54A and 55A which are characteristic structures of the present invention.
- the negative electrode insulating plate 5 ⁇ / b> B has a rectangular flat plate portion 51 ⁇ / b> B extending along the battery lid 8. As shown in FIG. 5A, a terminal opening 52B through which the shaft portion 73B of the negative electrode terminal 7B passes is formed in the flat plate portion 51B.
- the negative electrode insulating plate 5B is provided with a convex portion 54B that is a characteristic configuration of the present invention.
- the convex portions 54A, 55A, 54B are provided between the positive electrode insulating plate 5A, which is an insulating member provided between the positive electrode current collector plate 4A and the battery cover 8, and between the negative electrode current collector plate 4B and the battery cover 8. It is a part of the negative electrode insulating plate 5B, which is an insulating member provided, and is provided integrally with the flat plate portions 51A and 51B.
- the convex portions 54A, 55A, 54B protrude from the flat plate portions 51A, 51B, and the facing surface facing the curved surface portion 3a is located on the curved surface portion 3a side with respect to the cleavage valve 81.
- the convex portions 54A, 55A, 54B are configured to be in contact with the curved surface portion 3a in the normal state before the battery lid 8 is deformed. However, in this normal state, there is a predetermined gap. And it is good also as a structure which opposes.
- the convex portions 54 ⁇ / b> A, 55 ⁇ / b> A, 54 ⁇ / b> B have opposing surfaces that are smaller in width than the flat wound group 3.
- the protrusions have the same height and width.
- the convex portions 54A, 55A, 54B do not only indicate a state in which there is a protruding portion from the surroundings, but there is a difference in height between a high portion and a low portion such as one having a dent, and abuts against the flat wound group 3 It refers to a shape that can sometimes have a space for a gas flow path.
- the convex portion 54A is flatter than the injection opening 53A so as to be positioned adjacent to the side of the cleavage valve 81 at a position between the cleavage valve 81 and the injection port 82. It is provided on the tip side of the part 51A.
- the convex portion 55A is provided at a position between the liquid injection opening 53A and the terminal opening 52A so as to be positioned between the liquid injection port 82 and the positive electrode current collector plate 4A.
- the convex portion 54B is located between the tip of the flat plate portion 51B and the terminal opening 52B so that the convex portion 54B is located adjacent to the side of the cleavage valve 81 at a position between the negative electrode current collector plate 4B and the cleavage valve 81. It is provided over.
- the convex portions 54A, 55A, and 54B are disposed to face the curved surface portion 3a of the flat wound group 3, and in particular, the convex portions 54A of the positive electrode insulating plate 5A and the convex portions of the negative electrode insulating plate 5B.
- 54B is arrange
- the convex portion 55A has a proximal end arranged at a position adjacent to the positive electrode current collector plate base 41A of the positive electrode current collector plate 4A, even if the battery lid 8 is deformed to the flat wound group 3 side, the positive electrode The clearance between the current collector base 41A and the curved surface portion 3a of the flat wound group 3 can be maintained. Therefore, it is possible to suppress the occurrence of a short-circuit event that occurs when the positive electrode current collector plate base 41A of the positive electrode current collector plate 4A hits the flat wound group 3.
- the material of the positive electrode insulating plate 5A and the negative electrode insulating plate 5B is a resin such as polypropylene, polyethylene, polyethylene terephthalate, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyacrylonitrile, and the like. And the flat wound group 3 are preferably stretched.
- the cleavage valve 81 is deformed when the battery lid 8 is deformed. As long as a flow path can be secured, it may be provided only at a position adjacent to one side of the cleavage valve 81. Since the battery lid 8 is easy to deform due to the rigidity of the portion of the liquid injection port 82 being lowered, the liquid injection port 82 is provided when the convex portion is provided on either side of the cleavage valve 81. It is preferable to provide the convex portion 54A at the side adjacent to the positive electrode side of the cleavage valve 81 in this embodiment.
- the convex portions 54A and 55A and the flat plate portion 51A of the positive electrode insulating plate 5A and the negative electrode insulating plate 5B and the convex portion 54B are integral parts, respectively, but the convex portion and the flat plate portion are separate. It may be a part. In the case of a separate part, the degree of freedom of the material can be increased, and the material of the part corresponding to the convex part may be a metal (for example, aluminum), and a highly rigid part can be selected. In the case of a separate part, the part corresponding to the convex part is disposed on the battery lid 8 by, for example, integral molding if the material is resin, or welding if the material is metal.
- FIGS. 6A and 6B are diagrams for explaining an assembled state of the gas discharge duct to the assembled battery in Example 1,
- FIG. 6A is an overall perspective view, and
- FIG. 6B is a diagram of the gas discharge duct. It is a front view which shows an arrangement
- the module of the assembled battery formed by combining a plurality of prismatic secondary batteries 100 to which the present invention is applied is for gas discharge in order to safely discharge the gas discharged from the cleavage valve 81 of the prismatic secondary battery 100 to a designated place. It has a duct 101.
- a metal material such as iron is often used as a material having high heat resistance that can withstand high-temperature gas. Since the metal gas discharge duct 101 has higher rigidity than that made of resin, for example, when a module mounted on a vehicle is deformed due to an accident or the like, the battery lid 8 is inserted through the gas discharge duct 101. When pressed, the battery cover 8 may be deformed to the flat wound group 3 side.
- the convex portions 54A and 54B of the positive electrode insulating plate 5A and the negative electrode insulating plate 5B are arranged at least on the back side of the duct abutting portion with which the gas discharge duct 101 abuts, so that the battery lid 8 It is possible to prevent the cleavage valve 81 from coming into contact with the flat wound group 3 and to be blocked, and to secure a flow path for effectively discharging the gas inside the battery can 1.
- FIG. 7 is a diagram illustrating the structure of the insulating plate in the second embodiment. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. What is characteristic in the present embodiment is that the positive-side insulating plate and the negative-side insulating plate are integrally formed with one component.
- the convex portions 54A and 54B provided on both sides of the cleavage valve 81 are connected to each other via the insulating plate 205 and are continuously provided.
- the insulating plate 205 has a rectangular flat plate portion 251 disposed in parallel to face the lower surface of the battery lid 8. One end of the flat plate portion 251 is interposed between the battery lid 8 and the positive electrode current collector plate 4A, and the other end is interposed between the battery cover 8 and the negative electrode current collector plate 4B.
- a cleavage valve opening 253 ⁇ / b> B that communicates with the cleavage valve 81 of the battery lid 8 is formed at the longitudinal center position of the flat plate portion 251.
- the insulating plate 205 is provided with convex portions 54A, 54B, and 55A.
- the convex portions 54A and the convex portions 54B are provided separately on one side and the other side with a cleavage valve opening 253B interposed therebetween so as to be disposed at adjacent positions on both sides of the cleavage valve 81.
- the insulating plate is not composed of two parts divided into the positive electrode side and the negative electrode side as in the structure of the first embodiment, but is constituted by one integrated part.
- the number of parts can be reduced as compared with the configuration, and the assemblability is excellent.
- the cleavage valve 81 of the battery cover 8 is not flat wound group 3.
- the gas flow from the battery can 1 to the cleavage valve 81 is secured on both sides of the cleavage valve 81 to stabilize the gas from the cleavage valve 81. Can be discharged.
- the material of the insulating plate is a resin such as polypropylene, polyethylene, polyethylene terephthalate, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyacrylonitrile, and the like.
- a high-rigidity material is preferable because it stretches between them.
- the convex portions 54A, 54B, 55A and the flat plate portion 251 of the insulating plate 205 are an integral part, but may be constituted by separate parts. By using separate parts, the degree of freedom of the material can be increased.
- the parts constituting the convex portions 54A, 54B, and 55A may be made of metal (for example, aluminum) and have high rigidity. Can be selected.
- the part constituting the convex part is arranged on the battery lid 8 by integral molding if the material is resin, or by welding if the material is metal.
- FIG. 8 is a diagram illustrating the structure of the insulating plate in the third embodiment. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. What is characteristic in this embodiment is that a plurality of convex portions are provided in parallel.
- the insulating plate is constituted by two components, that is, the positive electrode insulating plate 305A and the negative electrode insulating plate 305B will be described as a representative example.
- the insulating plate is constituted by one component. Can also be applied.
- the positive electrode insulating plate 305 ⁇ / b> A has a base end interposed between the battery lid 8 and the positive electrode current collector plate 4 ⁇ / b> A, extends along the lower surface of the battery lid 8 toward the longitudinal center of the battery lid 8, and has a distal end at the cleavage valve 10. It is arrange
- the base end of the negative electrode insulating plate 305B is interposed between the battery lid 8 and the negative electrode current collector plate 4B, extends toward the longitudinal center of the battery lid 8 along the lower surface of the battery lid 8, and the tip is cleaved. It is arranged at a position adjacent to the valve 81.
- Projections 354A, 355A, and 354B are integrally provided on the positive electrode insulating plate 305A and the negative electrode insulating plate 305B.
- the convex portions 354A, 355A, and 354B are provided so as to protrude from the flat plate portions 51A and 51B toward the curved surface portion 3a of the flat wound group 3, and the facing surface that faces the curved surface portion 3a is curved more than the cleavage valve 81. It is located on the surface portion 3a side.
- the convex portions 354A, 355A, and 354B are configured to be in contact with the curved surface portion 3a in the normal state before the battery lid 8 is deformed, but in such a normal state, there is a predetermined gap. And it is good also as a structure which opposes.
- the convex portion 354A is provided on the distal end side of the flat plate portion 51A with respect to the injection opening 53A so as to be positioned adjacent to the side of the cleavage valve 81 at a position between the cleavage valve 81 and the injection port 82. It has been.
- the convex portion 355A is provided at a position between the liquid injection opening 53A and the terminal opening 52A so as to be positioned between the liquid injection port 82 and the positive electrode current collector plate 4A.
- the convex portion 354B is positioned between the tip of the flat plate portion 51B and the terminal opening 52B so that the convex portion 354B is located adjacent to the side of the cleavage valve 81 at a position between the negative electrode current collector plate 4B and the cleavage valve 81. It is provided over.
- the convex portions 354 A, 355 A, and 354 B have a width of the opposing surface that is smaller than the thickness of the flat wound group 3.
- a plurality of the electrodes are provided at predetermined intervals in the short direction of the positive electrode insulating plate 305A and in the short direction of the negative electrode insulating plate 305B.
- the convex portions 354A, 355A, and 354B have the same protruding height and width in the present embodiment.
- the convex portion bites into the curved surface portion 3a of the flat wound group 3, and the deformed flat wound group 3 is deformed.
- the gas discharge flow path may be narrowed.
- the facing surface is enlarged in order to prevent biting, the cross-sectional area of the space formed between the curved surface portion 3a of the flat wound group 3 and the battery lid 8 becomes narrow, and the gas discharge flow path becomes narrow. End up.
- a plurality of convex portions 354A, 355A, 354B are provided at predetermined intervals in the short direction of the positive electrode insulating plate 305A and the short direction of the negative electrode insulating plate 305B. It can suppress that convex part 354A, 355A, 354B bites into the flat winding group 3, and can prevent that a gas discharge flow path will be narrowed.
- the convex portions 354A, 355A, and 354B secure a gas flow path from the gas extending between the plurality of parallel extending portions to the cleavage valve 81, and stably discharging the gas from the cleavage valve 81. Can do.
- the number and arrangement interval of the convex portions 354A, 355A, and 354B may be any as long as they can suppress the biting into the flat wound group 3 and can secure the gas discharge channel, and are limited to the configuration of the present embodiment. It is not a thing.
- FIG. 9 is a diagram illustrating the structure of the insulating plate in the fourth embodiment. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. What is characteristic in this embodiment is that a space is provided between the opposing surface of the convex portion and the flat plate portion.
- the insulating plate is constituted by two components of the positive electrode insulating plate 405A and the negative electrode insulating plate 405B will be described as a representative.
- the insulating plate is constituted by one component. Can also be applied.
- the positive electrode insulating plate 405A has a proximal end interposed between the battery lid 8 and the positive electrode current collector plate 4A, extends along the lower surface of the battery lid 8 toward the longitudinal center of the battery lid 8, and has a distal end at the cleavage valve 81. It is arrange
- the base end of the negative electrode insulating plate 405B is interposed between the battery lid 8 and the negative electrode current collector plate 4B, extends toward the longitudinal center of the battery lid 8 along the lower surface of the battery lid 8, and the tip is cleaved. It is arranged at a position adjacent to the valve 81.
- the convex portions 454A, 455A, and 454B are integrally provided on the positive electrode insulating plate 405A and the negative electrode insulating plate 405B.
- the convex portions 454A, 455A, and 454B are provided so as to protrude from the flat plate portions 51A and 51B toward the curved surface portion 3a of the flat wound group 3, and the facing surface that faces the curved surface portion 3a is curved more than the cleavage valve 81. It is located on the surface portion 3a side.
- the convex portions 454A, 455A, and 454B are configured to be in contact with the curved surface portion 3a in the normal state before the battery lid 8 is deformed, but in such a normal state, there is a predetermined gap. And it is good also as a structure which opposes.
- the convex portion 454A is provided on the distal end side of the flat plate portion 51A with respect to the injection opening 53A so as to be positioned adjacent to the side of the cleavage valve 81 at a position between the cleavage valve 81 and the injection port 82. It has been.
- the convex portion 455A is provided at a position between the liquid injection opening 53A and the terminal opening 52A so as to be positioned between the liquid injection port 82 and the positive electrode current collector plate 4A.
- the convex portion 454B is positioned between the tip of the flat plate portion 51B and the terminal opening 52B so that the convex portion 454B is located adjacent to the side of the cleavage valve 81 at a position between the negative electrode current collector plate 4B and the cleavage valve 81. It is provided over.
- the convex portions 454A, 455A, and 454B extend along the longitudinal direction of the positive electrode insulating plate 405A and the negative electrode insulating plate 405B and communicate between the end surface on one side in the longitudinal direction and the end surface on the other side in the longitudinal direction.
- 456A, 457A, and 456B are formed.
- the communication paths 456A, 457A, and 456B are formed by a male type that protrudes from the flat plate portions 51A and 51B into the convex portions 454A, 455A, and 454B when the positive electrode insulating plate 405A and the negative electrode insulating plate 405B are molded. It is formed.
- the communication paths 456A, 457A, and 456B have spaces between the opposing surfaces of the convex portions 454A, 455A, and 454B and the flat plate portions 51A and 51B.
- Such space includes the space formed between the cleavage valve 81 of the battery lid 8 and the curved surface portion 3a of the flat wound group 3, the narrow side surface 14 of the battery can 1, and the winding axis direction of the flat wound group 3. It connects with the space formed between the end faces.
- This space is not narrowed by the winding group 3 due to deformation of the battery lid 8, a gas discharge passage can be secured, and gas can be discharged stably from the cleavage valve 81.
- the convex portions 54A, 55A, and 54B bite into the wound group 3, and the gas between the battery lid 8 and the deformed wound group 3 is lost. There is a possibility that the discharge channel is narrowed.
- a space is secured by the communication paths 456A, 457A, 456B of the convex portions 454A, 455A, 454B, and a gas flow path to the cleavage valve 81 in the battery can 1 is secured.
- FIG. 10 is a diagram illustrating the structure of the battery lid in the fifth embodiment. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. What is characteristic in this embodiment is that the convex portion is provided on the battery lid.
- the positive electrode insulating plate (not shown) has a size interposed between the positive electrode current collector plate base 41A and the battery lid 8, and the negative electrode insulating plate is the negative electrode current collector plate base 41B and the battery lid. 8 and a size interposed between the two.
- the battery lid 8 is integrally provided with convex portions 554A, 555A, and 554B.
- the convex portions 554A, 555A, and 554B are provided so as to protrude from the lower surface 551 of the battery lid 8 toward the curved surface portion 3a of the flat wound group 3, and the facing surface facing the curved surface portion 3a is curved more than the cleavage valve 81. It is located on the surface portion 3a side.
- the convex portions 554A, 555A, and 554B are configured to be in contact with the curved surface portion 3a in the normal state before the battery cover 8 is deformed, but in such a normal state, there is a predetermined gap. And it is good also as a structure which opposes.
- the convex portion 554A is provided between the cleavage valve 81 and the liquid injection port 82 so as to be positioned adjacent to the side of the cleavage valve 81.
- the convex portion 555A is provided at a position between the liquid injection port 82 and the opening 8A.
- the convex portion 554B is provided at a position between the cleavage valve 81 and the opening 8B so as to be adjacent to the side of the cleavage valve 81.
- the convex portions 554A, 555A, and 554B are disposed to face the curved surface portion 3a of the flat wound group 3, and in particular, the convex portions 554A of the positive electrode insulating plate 5A and the convex portions of the negative electrode insulating plate 5B.
- 554B is disposed at adjacent positions on both sides of the cleavage valve 81, respectively. Therefore, for example, even if an impact is applied to the rectangular secondary battery 100 and the battery cover 8 is deformed to the flat wound group 3 side, the battery cover 8 contacts the flat wound group 3 and the cleavage valve 81 is flat. It is possible to prevent obstruction by the group 3. Therefore, a gas flow path until the gas in the battery can 1 reaches the cleavage valve 81 can be secured, and the gas can be stably discharged from the cleavage valve 81.
- the battery lid 8 is provided with the convex portions 554A, 555A, and 554B. It is only necessary to mold, and the convex portions can be easily arranged. Moreover, compared with the case where a convex part is provided separately, a number of parts can be reduced and the ease of assembly can be improved.
- the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
- the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
- a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.
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Abstract
Description
本実施例では、本発明を適用した角形二次電池100の例を説明する。
図1は、角形二次電池の外観斜視図、図2は、角形二次電池の分解斜視図である。
角形二次電池100は、金属製の電池缶1と電池蓋8を備える。電池缶1は、一対の長辺部と一対の短辺部とを有する長方形の底面12と、底面12の一対の長辺部に連続して相対的に面積の大きい一対の対向する幅広側面13と、底面12の一対の短辺部に連続して相対的に面積の小さい一対の対向する幅狭側面14とを有しており、底面12に対向する上部には開口部11が形成されている。
扁平捲回群3は、負極電極32と正極電極34を間にセパレータ33、35を介して扁平状に捲回することによって構成されている。捲回群3は、最外周の電極が負極電極32であり、さらにその外側にセパレータ33、35が捲回される。セパレータ33、35は、正極電極34と負極電極32との間を絶縁する役割を有している。
図7は、実施例2における絶縁板の構造を説明する図である。なお、上述の実施例と同様の構成要素には同一の符号を付することでその詳細な説明は省略する。本実施例において特徴的なことは、正極側の絶縁板と負極側の絶縁板を一つの部品で一体に形成したことである。開裂弁81の両側に設けられた凸部54A、54Bは、絶縁板205を介して互いに接続されて連設されている。
図8は、実施例3における絶縁板の構造を説明する図である。なお、上述の実施例と同様の構成要素には同一の符号を付することでその詳細な説明は省略する。本実施例において特徴的なことは、凸部を平行に複数本設けたことである。
図9は、実施例4における絶縁板の構造を説明する図である。なお、上述の実施例と同様の構成要素には同一の符号を付することでその詳細な説明は省略する。本実施例において特徴的なことは、凸部の対向面と平板部との間に空間を設けたことである。
図10は、実施例5における電池蓋の構造を説明する図である。なお、上述の実施例と同様の構成要素には同一の符号を付することでその詳細な説明は省略する。本実施例において特徴的なことは、凸部を電池蓋に設けたことである。
101 ガス排出用ダクト
1 電池缶
3 扁平捲回群
3a 湾曲面部
8 電池蓋
11 開口部
54A、54B、55A 凸部
81 開裂弁
82 注液口
Claims (10)
- 電池缶の開口部側に扁平捲回群の湾曲面部を配置し、前記開口部を開裂弁と注液口とを有する電池蓋で密封する角形二次電池であって、
少なくとも前記注液口と前記開裂弁との間で前記電池蓋に配置され、前記開裂弁よりも前記湾曲面部側に対向面が位置する凸部を有する角形二次電池。 - 前記対向面の幅は、前記扁平捲回群の厚さよりも小さいことを特徴とする請求項1に記載の角形二次電池。
- 前記凸部は、開裂弁の両側に設けられていることを特徴とする請求項2に記載の角形二次電池。
- 前記開裂弁の両側に設けられた凸部は、互いに接続されて連設されることを特徴とする請求項3に記載の角形二次電池。
- 前記凸部は、前記電池蓋の一部であることを特徴とする請求項3に記載の角形二次電池。
- 前記凸部は、前記電池蓋とは別体であることを特徴とする請求項3に記載の角形二次電池。
- 前記凸部は、金属で構成されることを特徴とする請求項6に記載の角形二次電池。
- 前記凸部は、前記扁平捲回群と接続される集電板と前記電池蓋との間に設けられた絶縁部材の一部であることを特徴とする請求項6に記載の角形二次電池。
- 前記凸部の対向面と前記電池蓋との間には空間を有することを特徴とする請求項6乃至8のいずれかに記載の角形二次電池。
- 扁平捲回群の湾曲面部が開口部側に位置するように当該扁平捲回群を収納する電池缶と、前記開口部を塞ぎ開裂弁が設けられた電池蓋を有する角形二次電池であって、
前記電池蓋の前記開裂弁の周囲には、ガス排出用ダクトが当接するダクト当接部を有し、
前記ダクト当接部と前記湾曲面部との間には、前記開裂弁よりも前記湾曲面部側に対向面が位置する凸部が設けられていることを特徴とする角形二次電池。
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WO2021161738A1 (ja) * | 2020-02-13 | 2021-08-19 | 三洋電機株式会社 | 角形二次電池 |
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KR20220061014A (ko) * | 2020-11-05 | 2022-05-12 | 프라임 플래닛 에너지 앤드 솔루션즈 가부시키가이샤 | 전지 및 그 제조 방법 |
JP2022074818A (ja) * | 2020-11-05 | 2022-05-18 | プライムプラネットエナジー&ソリューションズ株式会社 | 電池およびその製造方法 |
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