WO2014068945A1 - Gasket and secondary battery - Google Patents
Gasket and secondary battery Download PDFInfo
- Publication number
- WO2014068945A1 WO2014068945A1 PCT/JP2013/006371 JP2013006371W WO2014068945A1 WO 2014068945 A1 WO2014068945 A1 WO 2014068945A1 JP 2013006371 W JP2013006371 W JP 2013006371W WO 2014068945 A1 WO2014068945 A1 WO 2014068945A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gasket
- adsorbent
- battery case
- battery
- layer
- Prior art date
Links
- 239000003463 adsorbent Substances 0.000 claims abstract description 130
- 238000007789 sealing Methods 0.000 claims abstract description 57
- 239000010410 layer Substances 0.000 claims description 87
- 239000011241 protective layer Substances 0.000 claims description 55
- 239000002344 surface layer Substances 0.000 claims description 30
- 239000003792 electrolyte Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 35
- 229910052751 metal Inorganic materials 0.000 description 28
- 239000002184 metal Substances 0.000 description 28
- 239000000463 material Substances 0.000 description 18
- 239000008151 electrolyte solution Substances 0.000 description 17
- 238000001179 sorption measurement Methods 0.000 description 15
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- -1 γ-butyl lactone Chemical class 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011255 nonaqueous electrolyte Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 229910013063 LiBF 4 Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- PPDFQRAASCRJAH-UHFFFAOYSA-N 2-methylthiolane 1,1-dioxide Chemical compound CC1CCCS1(=O)=O PPDFQRAASCRJAH-UHFFFAOYSA-N 0.000 description 1
- XKTYXVDYIKIYJP-UHFFFAOYSA-N 3h-dioxole Chemical compound C1OOC=C1 XKTYXVDYIKIYJP-UHFFFAOYSA-N 0.000 description 1
- SBUOHGKIOVRDKY-UHFFFAOYSA-N 4-methyl-1,3-dioxolane Chemical compound CC1COCO1 SBUOHGKIOVRDKY-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229910010238 LiAlCl 4 Inorganic materials 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910015044 LiB Inorganic materials 0.000 description 1
- 229910013375 LiC Inorganic materials 0.000 description 1
- 229910013372 LiC 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910013528 LiN(SO2 CF3)2 Inorganic materials 0.000 description 1
- 229910013385 LiN(SO2C2F5)2 Inorganic materials 0.000 description 1
- 229910017961 MgNi Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910010340 TiFe Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- 229910052712 strontium Inorganic materials 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
-
- 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
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/191—Inorganic material
-
- 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 gasket and a secondary battery including the gasket.
- secondary batteries (hereinafter sometimes simply referred to as “batteries”) with high energy density have been widely used as electronic devices such as AV devices and personal computers become cordless and portable.
- a secondary battery having a high energy density for example, a lithium ion secondary battery in which a charge / discharge reaction of the battery is performed by moving lithium ions between a positive electrode and a negative electrode is known.
- a secondary battery has the following configuration. That is, the electrode group wound with the positive electrode plate and the negative electrode plate sandwiching the separator is housed in the battery case together with the electrolytic solution.
- the side surface portion of the battery case is formed with a recessed portion that is recessed toward the inside of the battery case.
- the sealing body is arrange
- the open end of the battery case is caulked to the peripheral edge of the sealing body via a gasket.
- the opening of the battery case is sealed by the sealing body with the gasket interposed between the battery case and the sealing body.
- the gasket and the battery case are electrically insulated by the gasket.
- the electrolytic solution is decomposed in the battery case to generate carbon dioxide gas or the like.
- the gas generated in the battery case increases the battery internal pressure. Therefore, this gas can cause deformation and breakage of the battery case. Moreover, the deterioration of battery characteristics can be promoted.
- Patent Document 1 is a nonaqueous electrolyte battery in which a battery element is accommodated in an exterior material and sealed by thermal welding, and a gas-adsorbing substance is provided between the outermost layer of the exterior material and the battery element.
- a non-aqueous electrolyte battery having is disclosed.
- the gas generated in the battery case is adsorbed by the gas adsorbing substance provided between the outermost layer of the exterior material and the battery element, thereby suppressing the swelling of the exterior material. be able to.
- the present inventors have come to recognize that such a conventional secondary battery has room for improvement in improving battery performance.
- the present invention has been made in view of such circumstances, and an object thereof is to provide a technique for improving battery performance.
- a certain aspect of the present invention is a gasket.
- This gasket is a gasket provided between a battery case and a sealing body that seals the opening of the battery case, and contains an adsorbent that adsorbs at least one of moisture and gas generated in the battery case. It is characterized by that.
- the secondary battery includes an electrode group in which a positive electrode plate and a negative electrode plate are wound together with a separator, a battery case that houses the electrode group, a sealing body that seals an opening of the battery case, the battery case, And a gasket having the above-described configuration provided between the sealing member and the sealing member.
- a technique for improving battery performance can be provided.
- FIG. 1 is a cross-sectional view illustrating a schematic structure of a secondary battery according to Embodiment 1.
- FIG. FIG. 2A is a perspective view illustrating a schematic structure of the gasket according to the first embodiment.
- FIG. 2B is a cross-sectional view taken along line AA in FIG. 6 is a cross-sectional view illustrating a schematic structure of a gasket according to Embodiment 2.
- FIG. It is sectional drawing which shows schematic structure of the gasket which concerns on Embodiment 3.
- the conventional secondary battery in which the gas adsorbing substance is accommodated in the battery case has the following problems. That is, in the conventional secondary battery, the gas adsorbing member occupies a part of the space in the battery case. Therefore, the accommodation space for the electrode group is sacrificed by the amount of the gas adsorbing member. As a result, the battery capacity is lowered, and consequently the battery performance is lowered. Therefore, it is desirable to try to adsorb gas generated in the battery case while avoiding sacrificing the space in the battery case.
- FIG. 1 is a cross-sectional view illustrating a schematic structure of the secondary battery according to the first embodiment.
- the adsorbent 30 is schematically shown as a sphere.
- the secondary battery 100 according to this embodiment includes an electrode group 4, a battery case 5, a sealing body 10, and a gasket 17.
- the electrode group 4 is formed by winding the positive electrode plate 1 and the negative electrode plate 2 together with the separator 3.
- the positive electrode plate 1 and the negative electrode plate 2 are wound with the separator 3 interposed therebetween.
- the battery case 5 is a case that accommodates the electrode group 4.
- the electrode group 4 is accommodated in a cylindrical battery case 5 together with an electrolytic solution (not shown).
- the positive electrode plate 1 includes a positive electrode current collector and a positive electrode mixture layer formed on the positive electrode current collector and including a positive electrode active material.
- the negative electrode plate 2 includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector and including a negative electrode active material.
- the electrolytic solution is a conventionally known electrolytic solution, and includes an electrolyte salt and a solvent for dissolving the electrolyte salt.
- the electrolyte salt include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB (C 6 H 5 ) 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiC 4 F 9 SO 3 , and LiN (SO 2 CF 3) 2, LiN ( SO 2 C 2 F 5) 2, LiC (SO 2 CF 3) 3, LiAlCl 4, LiSiF 6, LiCl, LiBr , and the like.
- One of these electrolyte salts may be used alone, or a plurality of them may be used in combination.
- the electrolyte salt it is preferable to use LiPF 6 or LiBF 4 which is excellent in terms of oxidation stability.
- a non-aqueous solvent having a relatively high dielectric constant can be used as a solvent for the electrolytic solution.
- non-aqueous solvents include ethylene carbonate, propylene carbonate, ⁇ -butyl lactone, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, , 3-dioxolane, 4-methyl-1,3-dioxolane, diethyl ether, sulfolane, methyl sulfolane, acetonitrile, propionitrile, acetate ester, butyrate ester, propionate ester, and the like.
- One of these solvents may be used alone, or a plurality of solvents may be mixed and used.
- the positive electrode plate 1 is connected to the metal plate 11 of the sealing body 10 through the positive electrode lead 6.
- the negative electrode plate 2 is connected to the bottom of the battery case 5 via the negative electrode lead 7.
- An insulating plate 8 is disposed at the upper end of the electrode group 4, that is, at the end of the electrode group 4 on the opening end 5 a side of the battery case 5.
- an insulating plate 9 is disposed at the lower end of the electrode group 4, that is, at the end of the electrode group 4 on the bottom side of the battery case 5.
- the side surface of the battery case 5 is provided with a recess 18 that is recessed toward the inside of the battery case 5.
- a sealing body 10 is disposed above the recess 18 via a gasket 17.
- the gasket 17 is a member provided between the battery case 5 and the sealing body 10 and having a function of preventing a short circuit between the battery case 5 and the sealing body 10 in addition to a function of maintaining airtightness between the two.
- the gasket 17 of this embodiment contains the adsorbent 30. Further, the gasket 17 has a first end 17 s located inside the battery case 5 and a second end 17 t located outside the battery case 5. The structure of the gasket 17 will be described in detail later.
- the sealing body 10 is prevented from entering the electrode group 4 by the recess 18.
- the opening end 5 a of the battery case 5 is caulked on the center side of the battery case 5, in other words, on the peripheral edge side of the sealing body 10. That is, a caulking portion 19 is formed at the upper end of the battery case 5.
- the caulking portion 19 presses the peripheral edge portion of the sealing body 10 downward via the gasket 17.
- the opening of the battery case 5 is sealed by a sealing body 10 provided in the opening via a gasket 17.
- the upper part of the battery case 5 has a recessed portion 18 and a caulking portion 19, and thus the cross-sectional shape is substantially C-shaped or substantially U-shaped.
- the sealing body 10 is fixed to the battery case 5 by being sandwiched between the recessed portion 18 and the caulking portion 19 via the gasket 17.
- the “crimping portion 19” refers to a portion bent when the battery case 5 is caulked.
- the battery case 5 before forming the recess 18 and the caulking portion 19 has a bottomed cylindrical shape.
- a sealant layer 20 is formed by applying a sealant such as a bronze agent in a region from the recess 18 to the caulking part 19 on the inner surface of the battery case 5. Is provided.
- the sealing body 10 includes a metal plate 11, a first valve plate 12, an inner gasket 13, a second valve plate 14, a PTC (Positive Temporature Coefficient) element 15, and a cap 16.
- the metal plate 11 is connected to the positive electrode plate 1 through the positive electrode lead 6.
- the first valve plate 12 is disposed above the metal plate 11.
- the second valve plate 14 is disposed above the first valve plate 12.
- the inner gasket 13 is interposed between the first valve plate 12 and the second valve plate 14.
- the PTC element 15 has an annular shape and is disposed above the second valve plate 14.
- the PTC element 15 is an element having a positive temperature coefficient, and is an element whose internal resistance increases as the temperature rises.
- the cap 16 is disposed above the PTC element 15 and also serves as a positive electrode terminal.
- the metal plate 11 includes a disc portion 11a that is in contact with the lower surface of the peripheral portion of the first valve plate 12, and a cylindrical portion 11b that extends upward from the outer peripheral end of the disc portion 11a.
- the disc part 11a has a protruding part 11c that protrudes downward, that is, toward the bottom side of the battery case 5, at the center thereof.
- the peripheral portion of the first valve plate 12 is in contact with the upper surface of the disc portion 11a.
- the positive electrode lead 6 is in contact with the protruding portion 11c.
- the upper end portion of the cylindrical portion 11b is caulked toward the center side of the battery case 5, and thus the metal plate 11 has a caulking portion 11d at the peripheral edge thereof.
- the caulking portion 11 d is caulked to the peripheral edge portion of the cap 16 via the inner gasket 13.
- the cross-sectional shape of the caulking portion 11d is substantially L-shaped.
- the cross-sectional shape of the peripheral part of the metal plate 11, that is, the peripheral part of the disc part 11a, the cylindrical part 11b, and the caulking part 11d is substantially U-shaped.
- the “caulking portion 11d” refers to a portion bent when caulking the cylindrical portion 11b.
- the first valve plate 12 and the second valve plate 14 have thin portions with a small thickness.
- the first valve plate 12 and the second valve plate 14 are in contact with each other on the battery center side with respect to the thin portion.
- An inner gasket 13 is interposed between the peripheral edge of the first valve plate 12 and the peripheral edge of the second valve plate 14.
- the central portion of the first valve plate 12 and the central portion of the second valve plate 14 are in contact with each other.
- the PTC element 15 is in contact with the upper surface of the peripheral edge of the second valve plate 14.
- the cap 16 has a flat plate-like peripheral portion 16 a that contacts the PTC element 15, and a protruding portion 16 b that protrudes upward inside the peripheral portion 16 a, that is, toward the opening side of the battery case 5.
- the inner gasket 13 is in contact with the upper surface of the peripheral edge portion 16a.
- the outer surface of the inner gasket 13 is in contact with the upper surface of the peripheral portion of the first valve plate 12 and the inner surfaces of the cylindrical portion 11b and the caulking portion 11d. Further, the inner side surface of the inner gasket 13 is in contact with the lower surface and side surface of the peripheral portion of the second valve plate 14, the side surface of the PTC element 15, and the side surface and upper surface of the peripheral portion 16a. That is, the peripheral portion of the metal plate 11 sandwiches the first valve plate 12, the inner gasket 13, the second valve plate 14, the PTC element 15, and the cap 16. Thereby, each part is united.
- the sealing body 10 includes the first valve plate 12, the inner gasket 13, and the second valve plate 14 . That is, the secondary battery 100 has a function of cutting off the current flowing between the metal plate 11 and the cap 16 when gas is generated in the battery and the pressure in the battery rises and exceeds a predetermined pressure. Is preferred. Therefore, the sealing body 10 includes a first valve plate 12 and a second valve plate 14 that have thin portions that can be broken when the pressure in the battery exceeds a predetermined pressure, and whose central portions are in contact with each other, An inner gasket 13 is provided between the peripheral edge of the first valve plate 12 and the peripheral edge of the second valve plate 14.
- the first valve plate 12 and the second valve plate 14 are broken, the first valve plate 12 and the second valve plate 14 are separated from each other.
- the current flowing between the metal plate 11 and the cap 16 that are electrically connected via the plate 14 can be cut off.
- the cap 16 has an opening communicating with the outside of the battery.
- openings are formed in the metal plate 11 and the insulating plate 8.
- the sealing body 10 does not necessarily have to have two valve plates and the inner gasket 13.
- the sealing body 10 may include a metal plate 11, a PTC element 15 disposed on the metal plate 11, and a cap 16 disposed on the PTC element 15.
- the sealing body 10 has the PTC element 15 . That is, the secondary battery 100 preferably has a function of interrupting a current flowing between the metal plate 11 and the cap 16 when the temperature inside the battery exceeds a predetermined temperature. Therefore, the sealing body 10 is interposed between the second valve plate 14 electrically connected to the metal plate 11 and the cap 16, and has an internal resistance when the temperature in the battery exceeds a predetermined temperature. With increasing PTC elements 15. As a result, when the internal resistance of the PTC element 15 increases, the current flowing between the second valve plate 14 and the cap 16 is cut off, so that the metal plate 11 electrically connected to the second valve plate 14 and the cap The current flowing between the terminals 16 and 16 can be cut off.
- the sealing body 10 does not necessarily have to have the PTC element 15.
- the sealing body 10 includes a metal plate 11, a first valve plate 12 disposed on the metal plate 11, a second valve plate 14 disposed on the first valve plate 12, and a second You may have the cap 16 arrange
- the secondary battery 100 according to the present embodiment is improved in safety by degassing due to the breakage of the thin portions of the first valve plate 12 and the second valve plate 14 described above and the safety mechanism that cuts off the current by the PTC element 15. It has been.
- the generation of gas in the battery case 5 is suppressed by the gasket 17, or the gas generated in the battery case 5 is adsorbed. Thereby, the safety of the secondary battery 100 is further enhanced.
- the structure of the gasket 17 is demonstrated in detail.
- FIG. 2 (A) is a perspective view showing a schematic structure of the gasket according to the first embodiment.
- FIG. 2B is a cross-sectional view taken along line AA in FIG.
- the adsorbent 30 is schematically shown as a sphere.
- 2A and 2B show a state before the upper end portion of the gasket is bent inward due to the formation of the caulking portion 19.
- the gasket 17 for the secondary battery has a ring shape and is disposed between the upper part of the battery case 5 and the peripheral part of the metal plate 11.
- the outer surface of the gasket 17 is in contact with the upper inner surface of the battery case 5, and the inner surface of the gasket 17 is in contact with the outer surface of the peripheral edge of the metal plate 11.
- the gasket 17 is disposed outside the inner gasket 13 and thus constitutes an outer gasket.
- the upper end portion (second end portion 17t) of the ring-shaped gasket 17 is preferably located closer to the center of the battery than the open end portion 5a of the battery case 5.
- the gasket 17 contains an adsorbent 30.
- the adsorbent 30 is a substance that adsorbs at least one of moisture and gas generated in the battery case 5.
- the gasket 17 can be formed by mixing a powder of the adsorbent 30 with a conventionally known resin material used for forming a gasket and using a desired method such as extrusion molding or injection molding.
- the “moisture” includes liquid water and gaseous water (water vapor).
- the resin material is a material that can permeate gas components such as water vapor and gas derived from the electrolyte generated in the battery case 5 to some extent, but liquid water and electrolyte are less permeable than the gas components. .
- the gasket 17 is a function that the gasket should originally have, a sealing performance that prevents leakage of the electrolyte from the inside of the battery case 5, and an insulating performance that electrically insulates the battery case 5 from the sealing body 10.
- the function of the gasket 17 as a gasket is not impaired by the inclusion of the adsorbent 30.
- the content of the adsorbent 30 is, for example, preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, based on the total mass of the gasket 17; Preferably they are 0.1 mass% or more and 1 mass% or less.
- the content of the adsorbent 30 By setting the content of the adsorbent 30 to 0.1% by mass or more with respect to the total mass of the gasket 17, the effect of improving the performance of the secondary battery due to adsorption of moisture and / or gas generated in the battery case 5 is obtained. It can be demonstrated more reliably. Further, by setting the content of the adsorbent 30 to 10% by mass or less with respect to the total mass of the gasket 17, the gasket 17 is deformed due to moisture and / or gas adsorption, and the sealing performance and insulation performance described above are lowered. It can suppress more reliably. Moreover, it can suppress more reliably that shaping
- a carbon material for example, a carbon material, zeolite, metal, metal oxide, metal nitride, intermetallic compound, or the like can be used.
- carbon material activated carbon, carbon black, carbon molecular sieve, or the like can be used.
- a molecular sieve etc. can be used for a zeolite.
- metal oxide aluminum oxide, silica, titania, zirconia, or the like can be used.
- metals or intermetallic compounds examples include platinum, palladium, nickel, LaNi 5 , MgNi, TiFe, magnesium sulfate, Ca, Sr, Ba, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Calcium chloride, phosphorus pentoxide, etc. can be used.
- adsorbent 30 one of these may be used alone, or a plurality of kinds may be mixed and used.
- Examples of the resin material with which the adsorbent 30 is kneaded include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyimide, polyamideimide, polyamide, polyphenylene sulfide, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polytetrafluoroethylene.
- gas may be generated in the battery case 5 when, for example, overcharge / discharge is performed, or the battery is used in a high temperature environment or stored for a long time.
- a gas examples include CH 4 , C 2 H 4 , C 2 H 6 , CO, CO 2 , H 2 and the like, and among them, the amount of generated CH 4 and CO 2 is large.
- the generation of gas in the battery case 5 occurs, for example, when moisture contained in the atmosphere in the battery case 5 reacts with the electrolytic solution.
- the gasket 17 according to this embodiment contains the adsorbent 30.
- the gas generated in the battery case 5 can be adsorbed by the adsorbent 30, an increase in the battery internal pressure of the secondary battery 100 can be suppressed.
- moisture content in the atmosphere in the battery case 5 can be made to adsorb
- moisture content and electrolyte solution can be suppressed. As a result, an increase in battery internal pressure can be suppressed.
- the gasket 17 can adsorb moisture in the atmosphere of the environment where the secondary battery 100 is placed. Thereby, it can suppress that the water
- the adsorbent 30 is preferably capable of adsorbing moisture and gas generated in the battery case 5, but is not particularly limited thereto, and may adsorb only gas generated in the battery case 5. .
- the adsorbent 30 adsorbs the gas generated in the battery case 5, thereby suppressing an increase in battery internal pressure of the secondary battery 100.
- the adsorbent 30 may adsorb only moisture.
- the adsorbent 30 adsorbs moisture in the battery case 5 to suppress the generation of gas generated by the reaction between the moisture and the electrolytic solution, thereby suppressing the increase in the battery internal pressure of the secondary battery 100. be able to.
- the type and amount of gas generated in the battery case 5 greatly depend on the combination of constituent materials of the secondary battery 100. Therefore, the type of the adsorbent 30 and the content in the gasket 17 also greatly depend on the combination of the constituent materials of the secondary battery 100. Therefore, it is desirable that the type and content of the adsorbent 30 contained in the gasket 17 is appropriately selected in an actual battery system in which the gasket 17 is used, and this selection may be appropriately performed based on experiments and simulations by the designer. Is possible.
- the gasket 17 according to the present embodiment includes the adsorbent 30 that adsorbs at least one of moisture and gas generated in the battery case 5. Therefore, according to the gasket 17 of the present embodiment, the adsorbent 30 adsorbs the gas generated in the battery case 5 or the adsorbent 30 adsorbs moisture in the battery case 5 to generate the gas.
- transformation of the secondary battery 100 by the swelling of the battery case 5 can be suppressed.
- it can suppress that battery capacity and an output fall by what is called gas biting which gas accumulates locally between electrodes. Therefore, the performance of the secondary battery 100 can be improved.
- the gasket 17 has a function of adsorbing gas and / or moisture, it is possible to avoid sacrificing the space in the battery case 5, unlike the case where an adsorbing substance is disposed in the battery case 5. Therefore, the battery capacity of the secondary battery 100 can be increased as compared with the case where the adsorbing substance is disposed in the battery case 5. Therefore, the performance improvement and size reduction of the secondary battery 100 can be achieved.
- the gasket 17 has a function of adsorbing gas and / or moisture, the number of components of the secondary battery 100 can be reduced as compared with the case where the adsorbing substance is disposed in the battery case 5.
- the gasket 17 contains the adsorbent 30, the contact between the adsorbent 30 and the electrolytic solution can be suppressed as compared with the case where the adsorbent is disposed in the battery case 5. Thereby, the fall of the adsorption
- the adsorbent 30 adsorbs moisture, deterioration of the gasket 17 due to hydrolysis can be suppressed. Therefore, a short circuit between the battery case 5 and the sealing body 10 can be prevented more reliably, and thus the performance of the secondary battery 100 can be improved.
- FIG. 3 is a cross-sectional view illustrating a schematic structure of the gasket according to the second embodiment.
- the adsorbent 30 is schematically shown as a sphere.
- the gasket 17 includes an adsorbent-containing layer 17a and a protective layer 17b.
- the adsorbent-containing layer 17a is a layer containing the adsorbent 30.
- the protective layer 17 b is a layer that covers at least a part of the surface of the adsorbent-containing layer 17 a and prevents contact between the adsorbent-containing layer 17 a and the electrolytic solution in the battery case 5.
- the protective layer 17b is an adsorbent-free layer obtained by molding only the above-described resin material, for example.
- the adsorbent-containing layer 17a By covering the surface of the adsorbent-containing layer 17a with the protective layer 17b, contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution can be prevented. Thereby, it can avoid more reliably that the adsorption
- the protective layer 17b covers at least a part of the adsorbent-containing layer 17a, the adsorption performance of the adsorbent 30 described above is maintained at least in the region covered with the protective layer 17b of the adsorbent-containing layer 17a. An effect is obtained.
- the protective layer 17b covers the surface of the adsorbent-containing layer 17a, the adsorption of liquid moisture by the adsorbent 30 is somewhat hindered.
- the adsorbent 30 in the adsorbent-containing layer 17a can sufficiently absorb the gas and water vapor generated in the battery case 5. it can.
- the protective layer 17b constitutes the entire surface layer on the battery case 5 side and the entire surface layer on the sealing body 10 side.
- the gasket 17 has a shape in which a first end 17 s disposed in the battery case 5 is bent toward the central axis side of the gasket 17. That is, the gasket 17 has a disk part having an opening at the center and a cylinder part extending upward from the outer peripheral end of the disk part.
- the adsorbent-containing layer 17 a has a shape similar to that of the gasket 17. That is, the adsorbent-containing layer 17a has a disk part having an opening at the center and a cylinder part extending upward from the outer peripheral end of the disk part.
- the protective layer 17b includes an inner protective layer 17b1 that covers the upper surface of the disc portion of the adsorbent-containing layer 17a and the inner peripheral surface of the cylindrical portion, and the lower surface of the disc portion of the adsorbent-containing layer 17a and the outer periphery of the cylindrical portion. And an outer protective layer 17b2 covering the surface.
- the protective layer 17b constitutes the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side, thereby more reliably avoiding the contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution. Can do.
- the protective layer 17b may constitute only one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side. That is, the protective layer 17b only needs to have at least one of the inner protective layer 17b1 and the outer protective layer 17b2.
- the surface layer on the battery case 5 side is located closer to the electrolyte than the surface layer on the sealing body 10 side (see FIG. 1). Therefore, when the protective layer 17b constitutes only one of the surface layers, the protective layer 17b preferably constitutes a surface layer on the battery case 5 side.
- the gasket 17 can be formed, for example, by adhering an adsorbent-containing layer 17a and a protective layer 17b formed in advance by extrusion molding or the like by thermocompression bonding or the like. Moreover, the gasket 17 can be obtained by apply
- FIG. 4 is a cross-sectional view illustrating a schematic structure of the gasket according to the third embodiment.
- the adsorbent 30 is schematically shown as a sphere.
- the gasket 17 includes an adsorbent-containing layer 17a containing the adsorbent 30 and a protective layer 17b that prevents contact between the adsorbent-containing layer 17a and the electrolytic solution in the battery case 5.
- the protective layer 17b constitutes the entire surface layer on the battery case 5 side and the entire surface layer on the sealing body 10 side. That is, the protective layer 17b includes an inner protective layer 17b1 that covers the upper surface of the disc portion of the adsorbent-containing layer 17a and the inner peripheral surface of the cylindrical portion, and the lower surface of the disc portion of the adsorbent-containing layer 17a and the outer periphery of the cylindrical portion. And an outer protective layer 17b2 covering the surface.
- the protective layer 17 b covers the surface of the adsorbent-containing layer 17 a at the first end 17 s of the gasket 17 disposed in the battery case 5.
- the protective layer 17b in addition to the inner protective layer 17b1 and the outer protective layer 17b2, includes the inner surface of the disc part of the adsorbent-containing layer 17a, in other words, the first end 17s side of the adsorbent-containing layer 17a.
- the first end side protective layer 17b3 covering the end surface of the first end side.
- the upper surface of the disk portion at the first end portion 17s is covered with the inner protective layer 17b1
- the lower surface of the disk portion is covered with the outer protective layer 17b2
- the inner surface of the disk portion is The first end side protective layer 17b3 is covered.
- the first end 17 s of the gasket 17 disposed in the battery case 5 is sandwiched between the second end 17 t of the gasket 17 disposed outside the battery case 5 and the peripheral edge of the metal plate 11 and the battery case 5. Compared to the portion, it is a region that is more likely to come into contact with the electrolyte. Therefore, by covering the surface of the adsorbent-containing layer 17a at the first end portion 17s with the protective layer 17b, the contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution can be more reliably suppressed. . Thereby, the adsorption performance of the adsorbent 30 can be maintained for a longer period, and the high battery performance of the secondary battery 100 can be maintained for a longer period.
- the protective layer 17b may cover only the region on the first end portion 17s side of the adsorbent-containing layer 17a.
- the size of the adsorbent-containing layer 17a can be increased compared to the case where the protective layer 17b also covers other regions of the adsorbent-containing layer 17a. Therefore, the content of the adsorbent 30 in the entire gasket can be increased. Therefore, the moisture and / or gas adsorption capacity of the gasket can be increased.
- the surface of the adsorbent-containing layer 17a at the second end portion 17t of the gasket 17 is exposed.
- the upper end surface of the cylindrical portion of the adsorbent-containing layer 17a is exposed without being covered with the protective layer 17b.
- the gasket 17 can adsorb
- generation of gas inside the battery case 5 can be suppressed, and deterioration of the gasket 17 can be suppressed. Therefore, the battery performance of the secondary battery 100 can be improved.
- the inner protective layer 17b1, the outer protective layer 17b2, and the first end side protective layer 17b3 are integrally formed.
- a gasket 17 can be obtained by applying a resin material not containing the adsorbent 30 to the surface of the adsorbent-containing layer 17a formed in advance to form the protective layer 17b.
- the gasket 17 can also be formed by insert molding, for example. That is, the gasket 17 can be obtained by forming the protective layer 17b by covering the surface of the adsorbent-containing layer 17a with a resin material using the adsorbent-containing layer 17a formed in advance as a core material.
- FIG. 5 is a cross-sectional view illustrating a schematic structure of the gasket according to the fourth embodiment.
- the adsorbent 30 is schematically shown as a sphere.
- the gasket 17 includes an adsorbent-containing layer 17a and an adsorbent-free layer 17c.
- the adsorbent-containing layer 17a is a layer containing the adsorbent 30.
- the adsorbent-free layer 17c is a layer that does not contain the adsorbent 30, for example, obtained by molding only the resin material described above. And at least a part of the surface of the adsorbent-free layer 17c is covered with the adsorbent-containing layer 17a.
- the entire surface layer on the battery case 5 side of the gasket 17 and the entire surface layer on the sealing body 10 side contain the adsorbent 30. That is, the entire surface of the adsorbent-free layer 17c on the battery case 5 side and the entire surface on the sealing body 10 side are covered with the adsorbent-containing layer 17a.
- the adsorbent-containing layer 17a may constitute only one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side. That is, in the gasket 17, at least one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side only needs to contain the adsorbent 30.
- the adsorbent-free layer 17c by covering the surface of the adsorbent-free layer 17c with the adsorbent-containing layer 17a, more moisture and / or gas can be obtained compared to the case where the surface of the adsorbent-containing layer 17a is covered with the protective layer 17b. It can be made easy to adsorb.
- an existing gasket that does not contain the adsorbent 30 can be provided with a moisture and / or gas adsorption function. That is, the gasket 17 of this embodiment can be obtained by using the existing gasket as the adsorbent-free layer 17c and providing the adsorbent-containing layer 17a on the surface.
- the gasket 17 can be formed, for example, by adhering an adsorbent-containing layer 17a and an adsorbent-free layer 17c formed in advance by extrusion molding or the like by thermocompression bonding or the like.
- the gasket 17 can be obtained by applying a resin material containing the adsorbent 30 to the surface of the adsorbent-free layer 17c formed in advance to form the adsorbent-containing layer 17a.
- the gasket 17 can also be formed by insert molding, for example.
- the gasket 17 is formed by forming the adsorbent-containing layer 17a by coating the resin material containing the adsorbent 30 on the surface of the adsorbent-free layer 17c with the adsorbent-free layer 17c formed in advance as a core material. Obtainable.
- the sealing body 10 includes the metal plate 11, the first valve plate 12, the inner gasket 13, the second valve plate 14, the PTC element 15, and the cap 16, and the metal plate 11 has a structure in which the peripheral edge portion is caulked to the peripheral edge portion of the cap 16 via the inner gasket 13, but the structure of the sealing body 10 is not limited thereto.
- the peripheral edge of the metal plate 11 may not be caulked to the peripheral edge of the cap 16 via the inner gasket 13.
- the gasket 17 may have a structure of four or more layers, for example, between the adsorbent-containing layer 17a and the protective layer 17b, or between the adsorbent-containing layer 17a and the non-adsorbent-containing layer 17c. A layer may be provided.
- a gasket provided between a battery case and a sealing body that seals an opening of the battery case, A gasket comprising an adsorbent that adsorbs at least one of moisture and a gas generated in a battery case.
- the gasket according to item 1 comprising: [Item 3] The gasket according to Item 2, wherein the protective layer forms at least one of a surface layer on the battery case side and a surface layer on the sealing body side. [Item 4] The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case; 4. The gasket according to item 2 or 3, wherein the protective layer covers the surface of the adsorbent-containing layer at the first end.
- the gasket has a first end disposed inside the battery case and a second end disposed outside the battery case; The gasket according to any one of Items 2 to 4, wherein the adsorbent-containing layer has a surface exposed at the second end portion.
- the gasket according to item 1 wherein at least a part of a surface layer of the gasket contains the adsorbent.
- Item 7 Item 7. The gasket according to item 6, wherein at least one of the surface layer on the battery case side and the surface layer on the sealing body side contains the adsorbent.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
A gas generated in a battery case (5) increases battery inner pressure. Therefore, the gas may be the cause of deformation and breakage of the battery case (5). Furthermore, since the gas may accelerate deterioration of battery characteristics, a technology of suppressing the gas and improving the battery characteristics is provided. According to one embodiment of the present invention, a gasket (17) is provided between the battery case (5) and a sealing body (10) that seals an opening of the battery case (5), and the gasket contains an adsorbent (30) that adsorbs water and/or the gas generated in the battery case (5).
Description
本発明は、ガスケットと、当該ガスケットを備える二次電池に関する。
The present invention relates to a gasket and a secondary battery including the gasket.
近年、ＡＶ機器やパソコン等、電子機器のコードレス化やポータブル化に伴って、高エネルギー密度の二次電池（以下、単に「電池」ということもある）が多く採用されている。高エネルギー密度を有する二次電池としては、例えば、電池の充放電反応がリチウムイオンを正極と負極との間で移動させることで行われるリチウムイオン二次電池が知られている。
In recent years, secondary batteries (hereinafter sometimes simply referred to as “batteries”) with high energy density have been widely used as electronic devices such as AV devices and personal computers become cordless and portable. As a secondary battery having a high energy density, for example, a lithium ion secondary battery in which a charge / discharge reaction of the battery is performed by moving lithium ions between a positive electrode and a negative electrode is known.
一般に、二次電池は次のような構成を備える。すなわち、正極板及び負極板がセパレータを挟んだ状態で捲回された電極群が、電解液とともに電池ケース内に収容されている。電池ケースの側面部には、電池ケースの内側に向かって凹む、凹み部が形成されている。封口体は、ガスケットを介して凹み部の上に配設されている。電池ケースの開口端部は、ガスケットを介して封口体の周縁部にかしめられている。電池ケースの開口部は、ガスケットが電池ケースと封口体との間に介在した状態で、封口体により封口されている。ガスケットにより、封口体と電池ケースとの間が電気的に絶縁されている。
Generally, a secondary battery has the following configuration. That is, the electrode group wound with the positive electrode plate and the negative electrode plate sandwiching the separator is housed in the battery case together with the electrolytic solution. The side surface portion of the battery case is formed with a recessed portion that is recessed toward the inside of the battery case. The sealing body is arrange | positioned on the recessed part through the gasket. The open end of the battery case is caulked to the peripheral edge of the sealing body via a gasket. The opening of the battery case is sealed by the sealing body with the gasket interposed between the battery case and the sealing body. The gasket and the battery case are electrically insulated by the gasket.
このような二次電池では、例えば過充電や過放電が行われたり、高温環境下で使用あるいは長期間保存されたりした場合に、電池ケース内で電解液が分解されて炭酸ガス等が発生する場合がある。電池ケース内に発生したガスは電池内圧を増加させる。そのため、このガスは、電池ケースの変形や破損の原因となりうる。また、電池特性の低下を促進し得る。
In such a secondary battery, for example, when overcharge or overdischarge is performed, or when used in a high temperature environment or stored for a long time, the electrolytic solution is decomposed in the battery case to generate carbon dioxide gas or the like. There is a case. The gas generated in the battery case increases the battery internal pressure. Therefore, this gas can cause deformation and breakage of the battery case. Moreover, the deterioration of battery characteristics can be promoted.
これに対し、特許文献１には、外装材に電池素子が収容され、熱溶着により封入されてなる非水電解質電池であって、外装材の最外層と電池素子との間にガス吸着性物質を有する非水電解質電池が開示されている。
On the other hand, Patent Document 1 is a nonaqueous electrolyte battery in which a battery element is accommodated in an exterior material and sealed by thermal welding, and a gas-adsorbing substance is provided between the outermost layer of the exterior material and the battery element. A non-aqueous electrolyte battery having is disclosed.
上述した特許文献１の非水電解質電池では、外装材の最外層と電池素子との間に設けたガス吸着性物質によって電池ケース内に発生したガスを吸着することで、外装材の膨らみを抑えることができる。これに対し、本発明者らは鋭意研究を重ねた結果、このような従来の二次電池には、電池性能の向上を図る上で改善の余地があることを認識するに到った。
In the nonaqueous electrolyte battery of Patent Document 1 described above, the gas generated in the battery case is adsorbed by the gas adsorbing substance provided between the outermost layer of the exterior material and the battery element, thereby suppressing the swelling of the exterior material. be able to. On the other hand, as a result of intensive studies, the present inventors have come to recognize that such a conventional secondary battery has room for improvement in improving battery performance.
本発明はこうした状況に鑑みてなされたものであり、その目的は、電池性能の向上を図る技術を提供することにある。
The present invention has been made in view of such circumstances, and an object thereof is to provide a technique for improving battery performance.
本発明のある態様は、ガスケットである。このガスケットは、電池ケースと、当該電池ケースの開口部を封口する封口体との間に設けられるガスケットであって、水分及び電池ケース内で発生するガスの少なくとも一方を吸着する吸着剤を含有することを特徴とする。
A certain aspect of the present invention is a gasket. This gasket is a gasket provided between a battery case and a sealing body that seals the opening of the battery case, and contains an adsorbent that adsorbs at least one of moisture and gas generated in the battery case. It is characterized by that.
本発明の他の態様は二次電池である。この二次電池は、正極板及び負極板がセパレータとともに捲回された電極群と、前記電極群を収容する電池ケースと、前記電池ケースの開口部を封口する封口体と、前記電池ケースと前記封口体との間に設けられる上述した構成のガスケットと、を備えることを特徴とする。
Another aspect of the present invention is a secondary battery. The secondary battery includes an electrode group in which a positive electrode plate and a negative electrode plate are wound together with a separator, a battery case that houses the electrode group, a sealing body that seals an opening of the battery case, the battery case, And a gasket having the above-described configuration provided between the sealing member and the sealing member.
本発明によれば、電池性能の向上を図る技術を提供することができる。
According to the present invention, a technique for improving battery performance can be provided.
以下、本発明の実施の形態を図面を参照して説明する。なお、すべての図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.
まず、実施の形態を説明する前に、本発明者らが見出した知見を説明する。本発明者らは、電池ケース内にガス吸着性物質を収容した従来の二次電池では、以下の課題があることを見出した。すなわち、従来の二次電池では、ガス吸着性部材が電池ケース内の空間の一部を占めていた。そのため、ガス吸着性部材の分だけ電極群の収容スペースが犠牲となる。その結果、電池容量が低下し、ひいては電池性能が低下してしまう。したがって、電池ケース内の空間が犠牲となることを避けながら、電池ケース内に発生するガスの吸着を図ることが望まれる。
First, the knowledge found by the present inventors will be described before the embodiment is described. The present inventors have found that the conventional secondary battery in which the gas adsorbing substance is accommodated in the battery case has the following problems. That is, in the conventional secondary battery, the gas adsorbing member occupies a part of the space in the battery case. Therefore, the accommodation space for the electrode group is sacrificed by the amount of the gas adsorbing member. As a result, the battery capacity is lowered, and consequently the battery performance is lowered. Therefore, it is desirable to try to adsorb gas generated in the battery case while avoiding sacrificing the space in the battery case.
（実施形態１）
図１は、実施形態１に係る二次電池の概略構造を示す断面図である。なお、図１では、吸着剤３０を模式的に球体で示している。本実施形態では、二次電池として、リチウムイオン二次電池を用いた場合を具体例に挙げて説明する。本実施形態に係る二次電池１００は、電極群４と、電池ケース５と、封口体１０と、ガスケット１７と、を備える。 (Embodiment 1)
FIG. 1 is a cross-sectional view illustrating a schematic structure of the secondary battery according to the first embodiment. In FIG. 1, the adsorbent 30 is schematically shown as a sphere. In the present embodiment, a case where a lithium ion secondary battery is used as the secondary battery will be described as a specific example. Thesecondary battery 100 according to this embodiment includes an electrode group 4, a battery case 5, a sealing body 10, and a gasket 17.
図１は、実施形態１に係る二次電池の概略構造を示す断面図である。なお、図１では、吸着剤３０を模式的に球体で示している。本実施形態では、二次電池として、リチウムイオン二次電池を用いた場合を具体例に挙げて説明する。本実施形態に係る二次電池１００は、電極群４と、電池ケース５と、封口体１０と、ガスケット１７と、を備える。 (Embodiment 1)
FIG. 1 is a cross-sectional view illustrating a schematic structure of the secondary battery according to the first embodiment. In FIG. 1, the adsorbent 30 is schematically shown as a sphere. In the present embodiment, a case where a lithium ion secondary battery is used as the secondary battery will be described as a specific example. The
電極群４は、正極板１及び負極板２がセパレータ３とともに捲回されてなる。正極板１及び負極板２は、セパレータ３を挟んだ状態で捲回されている。電池ケース５は、電極群４を収容するケースである。電極群４は、電解液（図示せず）とともに円筒形の電池ケース５内に収容されている。詳細な図示を省略するが、正極板１は、正極集電体と、正極集電体の上に形成され且つ正極活物質を含む正極合剤層とを有する。また、負極板２は、負極集電体と、負極集電体の上に形成され且つ負極活物質を含む負極合剤層とを有する。
The electrode group 4 is formed by winding the positive electrode plate 1 and the negative electrode plate 2 together with the separator 3. The positive electrode plate 1 and the negative electrode plate 2 are wound with the separator 3 interposed therebetween. The battery case 5 is a case that accommodates the electrode group 4. The electrode group 4 is accommodated in a cylindrical battery case 5 together with an electrolytic solution (not shown). Although not shown in detail, the positive electrode plate 1 includes a positive electrode current collector and a positive electrode mixture layer formed on the positive electrode current collector and including a positive electrode active material. The negative electrode plate 2 includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector and including a negative electrode active material.
電解液は、従来公知の電解液であり、電解質塩と、この電解質塩を溶解させる溶媒とを含む。電解質塩としては、例えば、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＡｓＦ６、ＬｉＣｌＯ４、ＬｉＢ（Ｃ６Ｈ５）４、ＣＨ３ＳＯ３Ｌｉ、ＣＦ３ＳＯ３Ｌｉ、ＬｉＣ４Ｆ９ＳＯ３、ＬｉＮ（ＳＯ２ＣＦ３）２、ＬｉＮ（ＳＯ２Ｃ２Ｆ５）２、ＬｉＣ（ＳＯ２ＣＦ３）３、ＬｉＡｌＣｌ４、ＬｉＳｉＦ６、ＬｉＣｌ、ＬｉＢｒ等が挙げられる。電解質塩は、これらのうちの１種類を単独で用いてもよいし、複数種を混合して用いてもよい。電解質塩としては、酸化安定性の点で優れているＬｉＰＦ６、ＬｉＢＦ４を用いることが好ましい。
The electrolytic solution is a conventionally known electrolytic solution, and includes an electrolyte salt and a solvent for dissolving the electrolyte salt. Examples of the electrolyte salt include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB (C 6 H 5 ) 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiC 4 F 9 SO 3 , and LiN (SO 2 CF 3) 2, LiN ( SO 2 C 2 F 5) 2, LiC (SO 2 CF 3) 3, LiAlCl 4, LiSiF 6, LiCl, LiBr , and the like. One of these electrolyte salts may be used alone, or a plurality of them may be used in combination. As the electrolyte salt, it is preferable to use LiPF 6 or LiBF 4 which is excellent in terms of oxidation stability.
電解液の溶媒としては、比較的誘電率が高い非水溶媒を用いることができる。このような非水溶媒としては、例えばエチレンカーボネート、プロピレンカーボネート、γ－ブチルラクトン、ジエチルカーボネート、ジメチルカーボネート、１，２－ジメトキシエタン、１，２－ジエトキシエタン、テトラヒドロフラン、２－メチルテトラヒドロフラン、１，３－ジオキソラン、４－メチル－１，３－ジオキソラン、ジエチルエーテル、スルホラン、メチルスルホラン、アセトニトリル、プロピオニトリル、酢酸エステル、酪酸エステル、プロピオン酸エステル等が挙げられる。溶媒は、これらのうちの１種類を単独で用いてもよいし、複数種を混合して用いてもよい。
As a solvent for the electrolytic solution, a non-aqueous solvent having a relatively high dielectric constant can be used. Examples of such non-aqueous solvents include ethylene carbonate, propylene carbonate, γ-butyl lactone, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, , 3-dioxolane, 4-methyl-1,3-dioxolane, diethyl ether, sulfolane, methyl sulfolane, acetonitrile, propionitrile, acetate ester, butyrate ester, propionate ester, and the like. One of these solvents may be used alone, or a plurality of solvents may be mixed and used.
正極板１は、正極リード６を介して、封口体１０の金属板１１に接続されている。負極板２は、負極リード７を介して、電池ケース５の底部に接続されている。電極群４の上端、すなわち電極群４における電池ケース５の開口端部５ａ側の端部には、絶縁板８が配設されている。一方、電極群４の下端、すなわち電極群４における電池ケース５の底部側の端部には、絶縁板９が配設されている。
The positive electrode plate 1 is connected to the metal plate 11 of the sealing body 10 through the positive electrode lead 6. The negative electrode plate 2 is connected to the bottom of the battery case 5 via the negative electrode lead 7. An insulating plate 8 is disposed at the upper end of the electrode group 4, that is, at the end of the electrode group 4 on the opening end 5 a side of the battery case 5. On the other hand, an insulating plate 9 is disposed at the lower end of the electrode group 4, that is, at the end of the electrode group 4 on the bottom side of the battery case 5.
電池ケース５の側面部には、電池ケース５の内側に向かって凹む、凹み部１８が設けられている。凹み部１８の上方には、ガスケット１７を介して封口体１０が配設されている。ガスケット１７は、電池ケース５と封口体１０との間に設けられ、両者間の気密性を保持する機能のほか、電池ケース５と封口体１０との短絡を防止する機能を備える部材である。本実施形態のガスケット１７は、吸着剤３０を含有する。また、ガスケット１７は、電池ケース５内に位置する第１端部１７ｓと、電池ケース５外に位置する第２端部１７ｔとを有する。ガスケット１７の構造については後に詳細に説明する。
The side surface of the battery case 5 is provided with a recess 18 that is recessed toward the inside of the battery case 5. A sealing body 10 is disposed above the recess 18 via a gasket 17. The gasket 17 is a member provided between the battery case 5 and the sealing body 10 and having a function of preventing a short circuit between the battery case 5 and the sealing body 10 in addition to a function of maintaining airtightness between the two. The gasket 17 of this embodiment contains the adsorbent 30. Further, the gasket 17 has a first end 17 s located inside the battery case 5 and a second end 17 t located outside the battery case 5. The structure of the gasket 17 will be described in detail later.
電池ケース５の収容空間において、封口体１０は、凹み部１８により電極群４側への進入が妨げられている。電池ケース５の開口端部５ａは、電池ケース５の中心側、言い換えれば封口体１０の周縁部側にかしめられている。すなわち、電池ケース５の上端には、かしめ部１９が形成されている。かしめ部１９は、ガスケット１７を介して封口体１０の周縁部を下方に押圧している。電池ケース５の開口部は、ガスケット１７を介して開口部に設けられた封口体１０によって封口されている。
In the housing space of the battery case 5, the sealing body 10 is prevented from entering the electrode group 4 by the recess 18. The opening end 5 a of the battery case 5 is caulked on the center side of the battery case 5, in other words, on the peripheral edge side of the sealing body 10. That is, a caulking portion 19 is formed at the upper end of the battery case 5. The caulking portion 19 presses the peripheral edge portion of the sealing body 10 downward via the gasket 17. The opening of the battery case 5 is sealed by a sealing body 10 provided in the opening via a gasket 17.
電池ケース５の上部は、凹み部１８とかしめ部１９とを有し、したがってその断面形状は略Ｃ字状あるいは略Ｕ字状である。封口体１０は、ガスケット１７を介して凹み部１８とかしめ部１９とで挟持されて、電池ケース５に固定されている。本明細書において、「かしめ部１９」とは、電池ケース５をかしめる際に曲げられた部分をいう。凹み部１８及びかしめ部１９を形成する前の電池ケース５は、有底筒状である。電池ケース５内の気密性を高めるために、電池ケース５の内側面における凹み部１８からかしめ部１９までの領域には、ブロン剤等の封止剤が塗布されてなる、封止剤層２０が設けられている。
The upper part of the battery case 5 has a recessed portion 18 and a caulking portion 19, and thus the cross-sectional shape is substantially C-shaped or substantially U-shaped. The sealing body 10 is fixed to the battery case 5 by being sandwiched between the recessed portion 18 and the caulking portion 19 via the gasket 17. In the present specification, the “crimping portion 19” refers to a portion bent when the battery case 5 is caulked. The battery case 5 before forming the recess 18 and the caulking portion 19 has a bottomed cylindrical shape. In order to improve the airtightness in the battery case 5, a sealant layer 20 is formed by applying a sealant such as a bronze agent in a region from the recess 18 to the caulking part 19 on the inner surface of the battery case 5. Is provided.
封口体１０は、金属板１１と、第１弁板１２と、インナーガスケット１３と、第２弁板１４と、ＰＴＣ（Ｐｏｓｉｔｉｖｅ Ｔｅｍｐｅｒａｔｕｒｅ Ｃｏｅｆｆｉｃｉｅｎｔ）素子１５と、キャップ１６とを有する。金属板１１は、正極リード６を介して正極板１に接続されている。第１弁板１２は、金属板１１の上方に配設されている。第２弁板１４は、第１弁板１２の上方に配設されている。インナーガスケット１３は、第１弁板１２と第２弁板１４との間に介在している。ＰＴＣ素子１５は、環状形状を有し、第２弁板１４の上方に配設されている。ＰＴＣ素子１５は、正の温度係数を持つ素子であり、温度上昇により内部抵抗が増大する素子である。キャップ１６は、ＰＴＣ素子１５の上方に配設され、正極端子を兼ねている。
The sealing body 10 includes a metal plate 11, a first valve plate 12, an inner gasket 13, a second valve plate 14, a PTC (Positive Temporature Coefficient) element 15, and a cap 16. The metal plate 11 is connected to the positive electrode plate 1 through the positive electrode lead 6. The first valve plate 12 is disposed above the metal plate 11. The second valve plate 14 is disposed above the first valve plate 12. The inner gasket 13 is interposed between the first valve plate 12 and the second valve plate 14. The PTC element 15 has an annular shape and is disposed above the second valve plate 14. The PTC element 15 is an element having a positive temperature coefficient, and is an element whose internal resistance increases as the temperature rises. The cap 16 is disposed above the PTC element 15 and also serves as a positive electrode terminal.
より詳細には、金属板１１は、第１弁板１２の周縁部の下面に接する円板部１１ａと、円板部１１ａの外周端から上方に延在する筒部１１ｂとを有する。円板部１１ａは、その中心部に下方、すなわち電池ケース５の底部側に突出する突出部１１ｃを有する。円板部１１ａの上面には、第１弁板１２の周縁部が当接している。突出部１１ｃには、正極リード６が当接している。筒部１１ｂの上端部は、電池ケース５の中心側にかしめられており、したがって金属板１１は、その周縁部にかしめ部１１ｄを有する。かしめ部１１ｄは、インナーガスケット１３を介して、キャップ１６の周縁部にかしめられている。かしめ部１１ｄの断面形状は、略Ｌ字状である。また、金属板１１の周縁部、すなわち円板部１１ａの周縁部、筒部１１ｂ及びかしめ部１１ｄで構成される部分の断面形状は、略Ｕ字状である。なお、本明細書において、「かしめ部１１ｄ」とは、筒部１１ｂをかしめる際に曲げられた部分をいう。
More specifically, the metal plate 11 includes a disc portion 11a that is in contact with the lower surface of the peripheral portion of the first valve plate 12, and a cylindrical portion 11b that extends upward from the outer peripheral end of the disc portion 11a. The disc part 11a has a protruding part 11c that protrudes downward, that is, toward the bottom side of the battery case 5, at the center thereof. The peripheral portion of the first valve plate 12 is in contact with the upper surface of the disc portion 11a. The positive electrode lead 6 is in contact with the protruding portion 11c. The upper end portion of the cylindrical portion 11b is caulked toward the center side of the battery case 5, and thus the metal plate 11 has a caulking portion 11d at the peripheral edge thereof. The caulking portion 11 d is caulked to the peripheral edge portion of the cap 16 via the inner gasket 13. The cross-sectional shape of the caulking portion 11d is substantially L-shaped. Moreover, the cross-sectional shape of the peripheral part of the metal plate 11, that is, the peripheral part of the disc part 11a, the cylindrical part 11b, and the caulking part 11d is substantially U-shaped. In the present specification, the “caulking portion 11d” refers to a portion bent when caulking the cylindrical portion 11b.
第１弁板１２及び第２弁板１４は、厚みの薄い薄肉部を有する。薄肉部よりも電池中心側で、第１弁板１２と第２弁板１４とが当接している。第１弁板１２の周縁部と第２弁板１４の周縁部との間には、インナーガスケット１３が介在している。第１弁板１２の中央部と第２弁板１４の中央部とは、互いに当接している。第２弁板１４の周縁部の上面には、ＰＴＣ素子１５が当接している。
The first valve plate 12 and the second valve plate 14 have thin portions with a small thickness. The first valve plate 12 and the second valve plate 14 are in contact with each other on the battery center side with respect to the thin portion. An inner gasket 13 is interposed between the peripheral edge of the first valve plate 12 and the peripheral edge of the second valve plate 14. The central portion of the first valve plate 12 and the central portion of the second valve plate 14 are in contact with each other. The PTC element 15 is in contact with the upper surface of the peripheral edge of the second valve plate 14.
キャップ１６は、ＰＴＣ素子１５に当接する平板状の周縁部１６ａと、周縁部１６ａの内側で上方、すなわち電池ケース５の開口部側に突出する突出部１６ｂとを有する。周縁部１６ａの上面にはインナーガスケット１３が当接している。
The cap 16 has a flat plate-like peripheral portion 16 a that contacts the PTC element 15, and a protruding portion 16 b that protrudes upward inside the peripheral portion 16 a, that is, toward the opening side of the battery case 5. The inner gasket 13 is in contact with the upper surface of the peripheral edge portion 16a.
インナーガスケット１３の外側面は、第１弁板１２の周縁部の上面と、筒部１１ｂ及びかしめ部１１ｄの内側面とに当接している。また、インナーガスケット１３の内側面は、第２弁板１４の周縁部の下面及び側面と、ＰＴＣ素子１５の側面と、周縁部１６ａの側面及び上面とに当接している。すなわち、金属板１１の周縁部は、第１弁板１２、インナーガスケット１３、第２弁板１４、ＰＴＣ素子１５及びキャップ１６を挟持している。これにより、各部が一体となっている。
The outer surface of the inner gasket 13 is in contact with the upper surface of the peripheral portion of the first valve plate 12 and the inner surfaces of the cylindrical portion 11b and the caulking portion 11d. Further, the inner side surface of the inner gasket 13 is in contact with the lower surface and side surface of the peripheral portion of the second valve plate 14, the side surface of the PTC element 15, and the side surface and upper surface of the peripheral portion 16a. That is, the peripheral portion of the metal plate 11 sandwiches the first valve plate 12, the inner gasket 13, the second valve plate 14, the PTC element 15, and the cap 16. Thereby, each part is united.
封口体１０が第１弁板１２と、インナーガスケット１３と、第２弁板１４とを有する理由は、次の通りである。すなわち、二次電池１００は、電池内にガスが発生し、電池内の圧力が上昇し所定圧力を超えた場合に、金属板１１とキャップ１６との間に流れる電流を遮断する機能を有することが好ましい。そこで、封口体１０は、電池内の圧力が所定圧力を超えた時に破断可能な薄肉部を有し、且つ、中央部同士が互いに当接する第１弁板１２及び第２弁板１４と、第１弁板１２の周縁部と第２弁板１４の周縁部との間に介在するインナーガスケット１３とを有する。これにより、第１弁板１２及び第２弁板１４の薄肉部が破断した場合に、第１弁板１２と第２弁板１４とが互いに離間するため、第１弁板１２及び第２弁板１４を介して電気的に接続する金属板１１とキャップ１６との間に流れる電流を遮断することができる。
The reason why the sealing body 10 includes the first valve plate 12, the inner gasket 13, and the second valve plate 14 is as follows. That is, the secondary battery 100 has a function of cutting off the current flowing between the metal plate 11 and the cap 16 when gas is generated in the battery and the pressure in the battery rises and exceeds a predetermined pressure. Is preferred. Therefore, the sealing body 10 includes a first valve plate 12 and a second valve plate 14 that have thin portions that can be broken when the pressure in the battery exceeds a predetermined pressure, and whose central portions are in contact with each other, An inner gasket 13 is provided between the peripheral edge of the first valve plate 12 and the peripheral edge of the second valve plate 14. Accordingly, when the thin portions of the first valve plate 12 and the second valve plate 14 are broken, the first valve plate 12 and the second valve plate 14 are separated from each other. The current flowing between the metal plate 11 and the cap 16 that are electrically connected via the plate 14 can be cut off.
また、キャップ１６には、電池外と連通する開口部が形成されている。また、金属板１１及び絶縁板８には、開口部が形成されている。電池内にガスが発生し、電池内の圧力が所定圧力を超えると、第１弁板１２及び第２弁板１４の薄肉部が破断する。これにより、電池内に発生したガスは、絶縁板８の開口部、金属板１１の開口部、第１弁板１２の破断部、第２弁板１４の破断部及びキャップ１６の開口部を通って、電池外に排気される。
Also, the cap 16 has an opening communicating with the outside of the battery. In addition, openings are formed in the metal plate 11 and the insulating plate 8. When gas is generated in the battery and the pressure in the battery exceeds a predetermined pressure, the thin portions of the first valve plate 12 and the second valve plate 14 are broken. Thereby, the gas generated in the battery passes through the opening of the insulating plate 8, the opening of the metal plate 11, the broken portion of the first valve plate 12, the broken portion of the second valve plate 14, and the opening of the cap 16. Exhausted outside the battery.
したがって、封口体１０は、必ずしも２つの弁板と、インナーガスケット１３とを有している必要はない。例えば、封口体１０は、金属板１１と、金属板１１の上に配設されたＰＴＣ素子１５と、ＰＴＣ素子１５の上に配設されたキャップ１６とを有していてもよい。
Therefore, the sealing body 10 does not necessarily have to have two valve plates and the inner gasket 13. For example, the sealing body 10 may include a metal plate 11, a PTC element 15 disposed on the metal plate 11, and a cap 16 disposed on the PTC element 15.
封口体１０がＰＴＣ素子１５を有する理由は、次の通りである。すなわち、二次電池１００は、電池内の温度が所定温度を超えた場合に、金属板１１とキャップ１６との間に流れる電流を遮断する機能を有することが好ましい。そこで、封口体１０は、金属板１１と電気的に接続される第２弁板１４と、キャップ１６との間に介在し、且つ、電池内の温度が所定温度を超えたときに内部抵抗が増大するＰＴＣ素子１５を有する。これにより、ＰＴＣ素子１５の内部抵抗が増大すると、第２弁板１４とキャップ１６との間に流れる電流が遮断されるため、第２弁板１４と電気的に接続する金属板１１と、キャップ１６との間に流れる電流を遮断することができる。
The reason why the sealing body 10 has the PTC element 15 is as follows. That is, the secondary battery 100 preferably has a function of interrupting a current flowing between the metal plate 11 and the cap 16 when the temperature inside the battery exceeds a predetermined temperature. Therefore, the sealing body 10 is interposed between the second valve plate 14 electrically connected to the metal plate 11 and the cap 16, and has an internal resistance when the temperature in the battery exceeds a predetermined temperature. With increasing PTC elements 15. As a result, when the internal resistance of the PTC element 15 increases, the current flowing between the second valve plate 14 and the cap 16 is cut off, so that the metal plate 11 electrically connected to the second valve plate 14 and the cap The current flowing between the terminals 16 and 16 can be cut off.
したがって、封口体１０は、必ずしもＰＴＣ素子１５を有している必要はない。例えば、封口体１０は、金属板１１と、金属板１１の上に配設された第１弁板１２と、第１弁板１２の上に配設された第２弁板１４と、第２弁板１４の上に配設されたキャップ１６と、第１弁板１２の周縁部と第２弁板１４の周縁部との間に介在するインナーガスケット１３とを有していてもよい。
Therefore, the sealing body 10 does not necessarily have to have the PTC element 15. For example, the sealing body 10 includes a metal plate 11, a first valve plate 12 disposed on the metal plate 11, a second valve plate 14 disposed on the first valve plate 12, and a second You may have the cap 16 arrange | positioned on the valve plate 14, and the inner gasket 13 interposed between the peripheral part of the 1st valve plate 12, and the peripheral part of the 2nd valve plate 14. FIG.
本実施形態に係る二次電池１００は、上述した第１弁板１２及び第２弁板１４の薄肉部の破断によるガス抜きや、ＰＴＣ素子１５により電流を遮断する安全機構によって、安全性が高められている。また、二次電池１００は、ガスケット１７により電池ケース５内でのガスの発生が抑制され、あるいは電池ケース５内に発生するガスが吸着される。これにより、二次電池１００は安全性がより高められている。以下に、ガスケット１７の構成を詳細に説明する。
The secondary battery 100 according to the present embodiment is improved in safety by degassing due to the breakage of the thin portions of the first valve plate 12 and the second valve plate 14 described above and the safety mechanism that cuts off the current by the PTC element 15. It has been. In the secondary battery 100, the generation of gas in the battery case 5 is suppressed by the gasket 17, or the gas generated in the battery case 5 is adsorbed. Thereby, the safety of the secondary battery 100 is further enhanced. Below, the structure of the gasket 17 is demonstrated in detail.
図２（Ａ）は、実施形態１に係るガスケットの概略構造を示す斜視図である。図２（Ｂ）は、図２（Ａ）におけるＡ－Ａ線に沿った断面図である。なお、図２（Ｂ）では、吸着剤３０を模式的に球体で示している。また、図２（Ａ）及び図２（Ｂ）では、かしめ部１９の形成によりガスケット上端部が内側に折り曲げられる前の状態を示している。
FIG. 2 (A) is a perspective view showing a schematic structure of the gasket according to the first embodiment. FIG. 2B is a cross-sectional view taken along line AA in FIG. In FIG. 2B, the adsorbent 30 is schematically shown as a sphere. 2A and 2B show a state before the upper end portion of the gasket is bent inward due to the formation of the caulking portion 19.
二次電池用のガスケット１７は、リング状であり、電池ケース５の上部と、金属板１１の周縁部との間に配設される。ガスケット１７の外側面は電池ケース５の上部の内側面と当接し、ガスケット１７の内側面は金属板１１の周縁部の外側面と当接する。ガスケット１７は、インナーガスケット１３よりも外側に配置されており、したがって、アウターガスケットを構成している。リング状のガスケット１７の上端部（第２端部１７ｔ）は、電池ケース５の開口端部５ａよりも、電池の中心側に位置することが望ましい。
The gasket 17 for the secondary battery has a ring shape and is disposed between the upper part of the battery case 5 and the peripheral part of the metal plate 11. The outer surface of the gasket 17 is in contact with the upper inner surface of the battery case 5, and the inner surface of the gasket 17 is in contact with the outer surface of the peripheral edge of the metal plate 11. The gasket 17 is disposed outside the inner gasket 13 and thus constitutes an outer gasket. The upper end portion (second end portion 17t) of the ring-shaped gasket 17 is preferably located closer to the center of the battery than the open end portion 5a of the battery case 5.
ガスケット１７は、吸着剤３０を含有する。吸着剤３０は、水分及び電池ケース５内で発生するガスの少なくとも一方を吸着する物質である。ガスケット１７は、例えばガスケットの形成に用いられる従来公知の樹脂材料に吸着剤３０の粉末を混合し、押出成形や射出成形などの所望の方法を用いて形成することができる。ここで、前記「水分」には液体状態の水と、気体状態の水（水蒸気）とが含まれる。また、樹脂材料は、水蒸気や電池ケース５内で発生する電解液由来のガス等のガス成分は多少透過し得るが、液体状の水や電解液はガス成分に比べて透過しにくい材料である。
The gasket 17 contains an adsorbent 30. The adsorbent 30 is a substance that adsorbs at least one of moisture and gas generated in the battery case 5. The gasket 17 can be formed by mixing a powder of the adsorbent 30 with a conventionally known resin material used for forming a gasket and using a desired method such as extrusion molding or injection molding. Here, the “moisture” includes liquid water and gaseous water (water vapor). The resin material is a material that can permeate gas components such as water vapor and gas derived from the electrolyte generated in the battery case 5 to some extent, but liquid water and electrolyte are less permeable than the gas components. .
なお、ガスケット１７は、ガスケットが本来備えるべき機能である、電池ケース５内部からの電解液の漏れを防ぐシール性能と、電池ケース５と封口体１０との間を電気的に絶縁する絶縁性能とを当然に備えている。すなわち、吸着剤３０の含有によって、ガスケット１７のガスケットとしての機能は損なわれていない。吸着剤３０の含有量は、例えば、ガスケット１７の全質量に対して好ましくは０．１質量％以上１０質量％以下であり、より好ましくは０．１質量％以上５質量％以下であり、さらに好ましくは０．１質量％以上１質量％以下である。吸着剤３０の含有量をガスケット１７の全質量に対して０．１質量％以上とすることで、水分及び／又は電池ケース５内で発生するガスの吸着による二次電池の性能向上効果を、より確実に発揮させることができる。また、吸着剤３０の含有量をガスケット１７の全質量に対して１０質量％以下とすることで、水分及び／又はガスの吸着によりガスケット１７が変形して上述したシール性能や絶縁性能が低下してしまうことをより確実に抑制することができる。また、ガスケット１７の成形が困難になることをより確実に抑制することができる。
The gasket 17 is a function that the gasket should originally have, a sealing performance that prevents leakage of the electrolyte from the inside of the battery case 5, and an insulating performance that electrically insulates the battery case 5 from the sealing body 10. Of course. That is, the function of the gasket 17 as a gasket is not impaired by the inclusion of the adsorbent 30. The content of the adsorbent 30 is, for example, preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, based on the total mass of the gasket 17; Preferably they are 0.1 mass% or more and 1 mass% or less. By setting the content of the adsorbent 30 to 0.1% by mass or more with respect to the total mass of the gasket 17, the effect of improving the performance of the secondary battery due to adsorption of moisture and / or gas generated in the battery case 5 is obtained. It can be demonstrated more reliably. Further, by setting the content of the adsorbent 30 to 10% by mass or less with respect to the total mass of the gasket 17, the gasket 17 is deformed due to moisture and / or gas adsorption, and the sealing performance and insulation performance described above are lowered. It can suppress more reliably. Moreover, it can suppress more reliably that shaping | molding of the gasket 17 becomes difficult.
吸着剤３０としては、例えば、炭素材料、ゼオライト、金属、金属酸化物、金属窒化物、金属間化合物等を用いることができる。炭素材料には、活性炭、カーボンブラック、カーボンモレキュラーシーブ等を用いることができる。ゼオライトには、モレキュラーシーブ等を用いることができる。金属酸化物には、酸化アルミニウム、シリカ、チタニア、ジルコニア等を用いることができる。金属又は金属間化合物には、白金、パラジウム、ニッケル、ＬａＮｉ５、ＭｇＮｉ、ＴｉＦｅ、硫酸マグネシウム、Ｃａ、Ｓｒ、Ｂａ、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ｆｅ、塩化カルシウム、五酸化リン等を用いることができる。吸着剤３０は、これらのうちの１種類を単独で用いてもよいし、複数種を混合して用いてもよい。
As the adsorbent 30, for example, a carbon material, zeolite, metal, metal oxide, metal nitride, intermetallic compound, or the like can be used. As the carbon material, activated carbon, carbon black, carbon molecular sieve, or the like can be used. A molecular sieve etc. can be used for a zeolite. As the metal oxide, aluminum oxide, silica, titania, zirconia, or the like can be used. Examples of metals or intermetallic compounds include platinum, palladium, nickel, LaNi 5 , MgNi, TiFe, magnesium sulfate, Ca, Sr, Ba, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Calcium chloride, phosphorus pentoxide, etc. can be used. As the adsorbent 30, one of these may be used alone, or a plurality of kinds may be mixed and used.
吸着剤３０が混練される樹脂材料としては、例えばポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリイミド、ポリアミドイミド、ポリアミド、ポリフェニレンサルファイド、テトラフルオロエチレン－パーフルオロアルキルビニルエーテルコポリマー、ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ化エチレンポリプロピレンコポリマー、エチレンテトラフルオロエチレンコポリマー、ポリフッ化ビニル、エポキシ樹脂、アクリル樹脂、メタクリル樹脂、天然ゴム、合成ゴム、及びこれらの混合系樹脂や架橋型樹脂から選ばれる少なくとも１種類以上のものを用いることができる。
Examples of the resin material with which the adsorbent 30 is kneaded include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyimide, polyamideimide, polyamide, polyphenylene sulfide, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polytetrafluoroethylene. At least one selected from fluoroethylene, fluorinated ethylene polypropylene copolymer, ethylene tetrafluoroethylene copolymer, polyvinyl fluoride, epoxy resin, acrylic resin, methacrylic resin, natural rubber, synthetic rubber, and mixed resins and cross-linked resins thereof The above can be used.
一般に二次電池では、例えば過充放電が行われたり、高温環境下での使用あるいは長期間保存等がなされた場合に、電池ケース５内でガスが発生する場合がある。このようなガスとしては、例えばＣＨ４、Ｃ２Ｈ４、Ｃ２Ｈ６、ＣＯ、ＣＯ２、Ｈ２等が挙げられ、なかでもＣＨ４とＣＯ２の発生量が多い。また、電池ケース５内でのガスの発生は、例えば電池ケース５内の雰囲気中に含まれる水分が電解液と反応して起こる。これに対し、本実施形態に係るガスケット１７は、吸着剤３０を含有している。したがって、電池ケース５内に発生したガスを吸着剤３０に吸着させることができるため、二次電池１００の電池内圧の上昇を抑制することができる。あるいは、電池ケース５内の雰囲気中の水分を吸着剤３０に吸着させることができるため、水分と電解液との反応によるガスの発生を抑制することができる。その結果、電池内圧の上昇を抑制することができる。
In general, in a secondary battery, gas may be generated in the battery case 5 when, for example, overcharge / discharge is performed, or the battery is used in a high temperature environment or stored for a long time. Examples of such a gas include CH 4 , C 2 H 4 , C 2 H 6 , CO, CO 2 , H 2 and the like, and among them, the amount of generated CH 4 and CO 2 is large. Further, the generation of gas in the battery case 5 occurs, for example, when moisture contained in the atmosphere in the battery case 5 reacts with the electrolytic solution. On the other hand, the gasket 17 according to this embodiment contains the adsorbent 30. Therefore, since the gas generated in the battery case 5 can be adsorbed by the adsorbent 30, an increase in the battery internal pressure of the secondary battery 100 can be suppressed. Or since the water | moisture content in the atmosphere in the battery case 5 can be made to adsorb | suck to the adsorption agent 30, generation | occurrence | production of the gas by reaction of a water | moisture content and electrolyte solution can be suppressed. As a result, an increase in battery internal pressure can be suppressed.
また、ガスケット１７は、第２端部１７ｔが電池ケース５の外部に露出している（図１参照）。そのため、ガスケット１７は、二次電池１００が置かれる環境の雰囲気中の水分を吸着することができる。これにより、二次電池１００の外部にある水分が電池ケース５内に進入し、電解液と反応してガスが発生することを抑制することができる。また、例えば隣接する他の二次電池の内部からガスが漏出した場合、二次電池１００が置かれる環境の雰囲気中のガスを吸着することができる。
Further, the second end 17t of the gasket 17 is exposed to the outside of the battery case 5 (see FIG. 1). Therefore, the gasket 17 can adsorb moisture in the atmosphere of the environment where the secondary battery 100 is placed. Thereby, it can suppress that the water | moisture content outside the secondary battery 100 approachs into the battery case 5, reacts with electrolyte solution, and generate | occur | produces gas. For example, when gas leaks from the inside of another adjacent secondary battery, the gas in the atmosphere of the environment where the secondary battery 100 is placed can be adsorbed.
なお、吸着剤３０は、水分及び電池ケース５内で発生するガスを吸着できるものが好ましいが、特にこれに限定されず、電池ケース５内で発生するガスのみを吸着するものであってもよい。この場合、吸着剤３０が電池ケース５内で発生したガスを吸着することで、二次電池１００の電池内圧の上昇を抑制することができる。あるいは、吸着剤３０は、水分のみを吸着するものであってもよい。この場合、吸着剤３０が電池ケース５内の水分を吸着することで、水分と電解液との反応により発生するガスの発生を抑制し、これにより二次電池１００の電池内圧の上昇を抑制することができる。
The adsorbent 30 is preferably capable of adsorbing moisture and gas generated in the battery case 5, but is not particularly limited thereto, and may adsorb only gas generated in the battery case 5. . In this case, the adsorbent 30 adsorbs the gas generated in the battery case 5, thereby suppressing an increase in battery internal pressure of the secondary battery 100. Alternatively, the adsorbent 30 may adsorb only moisture. In this case, the adsorbent 30 adsorbs moisture in the battery case 5 to suppress the generation of gas generated by the reaction between the moisture and the electrolytic solution, thereby suppressing the increase in the battery internal pressure of the secondary battery 100. be able to.
また、電池ケース５で発生するガスの種類及び発生量は、二次電池１００の構成材料の組み合わせに大きく依存する。そのため、吸着剤３０の種類及びガスケット１７中の含有量もまた、二次電池１００の構成材料の組み合わせに大きく依存する。したがって、ガスケット１７に含有させる吸着剤３０の種類及び含有量は、ガスケット１７が用いられる実際の電池系において適宜選択することが望ましく、この選択は設計者による実験やシミュレーションに基づき適宜実施することが可能である。
Further, the type and amount of gas generated in the battery case 5 greatly depend on the combination of constituent materials of the secondary battery 100. Therefore, the type of the adsorbent 30 and the content in the gasket 17 also greatly depend on the combination of the constituent materials of the secondary battery 100. Therefore, it is desirable that the type and content of the adsorbent 30 contained in the gasket 17 is appropriately selected in an actual battery system in which the gasket 17 is used, and this selection may be appropriately performed based on experiments and simulations by the designer. Is possible.
以上説明したように、本実施形態に係るガスケット１７は、水分及び電池ケース５内で発生するガスの少なくとも一方を吸着する吸着剤３０を含有する。したがって、本実施形態のガスケット１７によれば、吸着剤３０が電池ケース５内で発生するガスを吸着することで、あるいは吸着剤３０が電池ケース５内の水分を吸着して前記ガスの発生を抑制することで、電池ケース５の膨らみによる二次電池１００の変形を抑制することができる。また、ガスが電極間で局所的に溜まる、いわゆるガス噛みによって電池容量や出力が低下することを抑制することができる。よって、二次電池１００の性能を向上させることができる。
As described above, the gasket 17 according to the present embodiment includes the adsorbent 30 that adsorbs at least one of moisture and gas generated in the battery case 5. Therefore, according to the gasket 17 of the present embodiment, the adsorbent 30 adsorbs the gas generated in the battery case 5 or the adsorbent 30 adsorbs moisture in the battery case 5 to generate the gas. By suppressing, the deformation | transformation of the secondary battery 100 by the swelling of the battery case 5 can be suppressed. Moreover, it can suppress that battery capacity and an output fall by what is called gas biting which gas accumulates locally between electrodes. Therefore, the performance of the secondary battery 100 can be improved.
また、ガスケット１７にガス及び／又は水分の吸着機能を持たせているため、電池ケース５内に吸着物質を配置する場合とは異なり、電池ケース５内の空間が犠牲になることを回避できる。そのため、電池ケース５内に吸着物質を配置する場合に比べて、二次電池１００の電池容量を増大させることができる。よって、二次電池１００の性能向上や小型化を図ることができる。また、ガスケット１７にガス及び／又は水分の吸着機能を持たせているため、吸着物質を電池ケース５内に配置する場合に比べて、二次電池１００の部品点数を削減することができる。
In addition, since the gasket 17 has a function of adsorbing gas and / or moisture, it is possible to avoid sacrificing the space in the battery case 5, unlike the case where an adsorbing substance is disposed in the battery case 5. Therefore, the battery capacity of the secondary battery 100 can be increased as compared with the case where the adsorbing substance is disposed in the battery case 5. Therefore, the performance improvement and size reduction of the secondary battery 100 can be achieved. In addition, since the gasket 17 has a function of adsorbing gas and / or moisture, the number of components of the secondary battery 100 can be reduced as compared with the case where the adsorbing substance is disposed in the battery case 5.
また、ガスケット１７が吸着剤３０を含有しているため、電池ケース５内に吸着物質を配置する場合に比べて、吸着剤３０と電解液との接触を抑制することができる。これにより、吸着剤３０が電解液と接触することで起こる吸着剤３０の吸着性能の低下を抑制することができる。したがって、二次電池１００は、長期間高い電池性能を維持することができる。さらに、吸着剤３０が電池内で発生するガスを吸着することで、ガスとの接触によるガスケット１７の劣化を抑制することができる。また、吸着剤３０が水分を吸着することで、加水分解によるガスケット１７の劣化を抑制することができる。そのため、電池ケース５と封口体１０との短絡をより確実に防ぐことができ、したがって二次電池１００の性能を向上させることができる。
Further, since the gasket 17 contains the adsorbent 30, the contact between the adsorbent 30 and the electrolytic solution can be suppressed as compared with the case where the adsorbent is disposed in the battery case 5. Thereby, the fall of the adsorption | suction performance of the adsorbent 30 which arises when the adsorbent 30 contacts electrolyte solution can be suppressed. Therefore, the secondary battery 100 can maintain high battery performance for a long time. Furthermore, since the adsorbent 30 adsorbs the gas generated in the battery, deterioration of the gasket 17 due to contact with the gas can be suppressed. Moreover, since the adsorbent 30 adsorbs moisture, deterioration of the gasket 17 due to hydrolysis can be suppressed. Therefore, a short circuit between the battery case 5 and the sealing body 10 can be prevented more reliably, and thus the performance of the secondary battery 100 can be improved.
（実施形態２）
実施形態２に係るガスケットは、吸着剤を含有する吸着剤含有層と、吸着剤含有層を保護する保護層との多層構造を備える点を除き、実施形態１に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態２に係るガスケット及び二次電池について、実施形態１と異なる構成を中心に説明する。図３は、実施形態２に係るガスケットの概略構造を示す断面図である。なお、図３では、吸着剤３０を模式的に球体で示している。 (Embodiment 2)
The gasket according to the second embodiment is common to the configuration of the gasket according to the first embodiment, except that a multilayer structure including an adsorbent-containing layer containing an adsorbent and a protective layer that protects the adsorbent-containing layer is provided. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the second embodiment will be described focusing on the configuration different from the first embodiment. FIG. 3 is a cross-sectional view illustrating a schematic structure of the gasket according to the second embodiment. In FIG. 3, the adsorbent 30 is schematically shown as a sphere.
実施形態２に係るガスケットは、吸着剤を含有する吸着剤含有層と、吸着剤含有層を保護する保護層との多層構造を備える点を除き、実施形態１に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態２に係るガスケット及び二次電池について、実施形態１と異なる構成を中心に説明する。図３は、実施形態２に係るガスケットの概略構造を示す断面図である。なお、図３では、吸着剤３０を模式的に球体で示している。 (Embodiment 2)
The gasket according to the second embodiment is common to the configuration of the gasket according to the first embodiment, except that a multilayer structure including an adsorbent-containing layer containing an adsorbent and a protective layer that protects the adsorbent-containing layer is provided. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the second embodiment will be described focusing on the configuration different from the first embodiment. FIG. 3 is a cross-sectional view illustrating a schematic structure of the gasket according to the second embodiment. In FIG. 3, the adsorbent 30 is schematically shown as a sphere.
本実施形態に係るガスケット１７は、吸着剤含有層１７ａと、保護層１７ｂと、を備える。吸着剤含有層１７ａは、吸着剤３０を含有する層である。保護層１７ｂは、吸着剤含有層１７ａの表面の少なくとも一部を被覆し、吸着剤含有層１７ａと電池ケース５内の電解液との接触を妨げる層である。保護層１７ｂは、例えば上述した樹脂材料のみを成形して得られる吸着剤非含有層である。
The gasket 17 according to the present embodiment includes an adsorbent-containing layer 17a and a protective layer 17b. The adsorbent-containing layer 17a is a layer containing the adsorbent 30. The protective layer 17 b is a layer that covers at least a part of the surface of the adsorbent-containing layer 17 a and prevents contact between the adsorbent-containing layer 17 a and the electrolytic solution in the battery case 5. The protective layer 17b is an adsorbent-free layer obtained by molding only the above-described resin material, for example.
吸着剤含有層１７ａの表面を保護層１７ｂで被覆することで、吸着剤含有層１７ａ中の吸着剤３０と電解液との接触を防ぐことができる。これにより、吸着剤３０の吸着性能が低下することをより確実に回避することができる。その結果、吸着剤３０の吸着性能をより長期間維持することができ、二次電池１００の高い電池性能をより長期間維持することができる。なお、保護層１７ｂが吸着剤含有層１７ａの少なくとも一部を被覆していれば、少なくとも吸着剤含有層１７ａの保護層１７ｂで被覆された領域において、上述した吸着剤３０の吸着性能を維持する効果が得られる。
By covering the surface of the adsorbent-containing layer 17a with the protective layer 17b, contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution can be prevented. Thereby, it can avoid more reliably that the adsorption | suction performance of the adsorption agent 30 falls. As a result, the adsorption performance of the adsorbent 30 can be maintained for a longer period, and the high battery performance of the secondary battery 100 can be maintained for a longer period. If the protective layer 17b covers at least a part of the adsorbent-containing layer 17a, the adsorption performance of the adsorbent 30 described above is maintained at least in the region covered with the protective layer 17b of the adsorbent-containing layer 17a. An effect is obtained.
保護層１７ｂが吸着剤含有層１７ａの表面を被覆しているため、吸着剤３０による液体状の水分の吸着は多少妨げられる。一方、電池ケース５内で発生するガスや水蒸気は保護層１７ｂを透過するため、吸着剤含有層１７ａ中の吸着剤３０は、電池ケース５内で発生するガスや水蒸気を十分に吸収することができる。
Since the protective layer 17b covers the surface of the adsorbent-containing layer 17a, the adsorption of liquid moisture by the adsorbent 30 is somewhat hindered. On the other hand, since gas and water vapor generated in the battery case 5 permeate the protective layer 17b, the adsorbent 30 in the adsorbent-containing layer 17a can sufficiently absorb the gas and water vapor generated in the battery case 5. it can.
本実施形態では、保護層１７ｂは、電池ケース５側の表層全体及び封口体１０側の表層全体を構成している。より詳細には、ガスケット１７は、電池ケース５内に配置される第１端部１７ｓがガスケット１７の中心軸側に向かって折り曲がった形状を有する。すなわち、ガスケット１７は、中心に開口を有する円板部と、円板部の外周端から上方に延在する筒部とを有する。また、吸着剤含有層１７ａは、ガスケット１７と相似する形状を有する。すなわち、吸着剤含有層１７ａは、中心に開口を有する円板部と、円板部の外周端から上方に延在する筒部とを有する。そして、保護層１７ｂは、吸着剤含有層１７ａの円板部の上面と筒部の内周面を被覆する内側保護層１７ｂ１と、吸着剤含有層１７ａの円板部の下面と筒部の外周面を被覆する外側保護層１７ｂ２とを有する。
In the present embodiment, the protective layer 17b constitutes the entire surface layer on the battery case 5 side and the entire surface layer on the sealing body 10 side. More specifically, the gasket 17 has a shape in which a first end 17 s disposed in the battery case 5 is bent toward the central axis side of the gasket 17. That is, the gasket 17 has a disk part having an opening at the center and a cylinder part extending upward from the outer peripheral end of the disk part. The adsorbent-containing layer 17 a has a shape similar to that of the gasket 17. That is, the adsorbent-containing layer 17a has a disk part having an opening at the center and a cylinder part extending upward from the outer peripheral end of the disk part. The protective layer 17b includes an inner protective layer 17b1 that covers the upper surface of the disc portion of the adsorbent-containing layer 17a and the inner peripheral surface of the cylindrical portion, and the lower surface of the disc portion of the adsorbent-containing layer 17a and the outer periphery of the cylindrical portion. And an outer protective layer 17b2 covering the surface.
このように、保護層１７ｂが電池ケース５側の表層及び封口体１０側の表層を構成することにより、吸着剤含有層１７ａ中の吸着剤３０と電解液との接触をより確実に回避することができる。なお、保護層１７ｂは、電池ケース５側の表層と封口体１０側の表層のいずれか一方のみを構成してもよい。すなわち、保護層１７ｂは、内側保護層１７ｂ１及び外側保護層１７ｂ２の少なくとも一方を有していればよい。ガスケット１７は、二次電池１００に嵌め込まれた状態で、封口体１０側の表層よりも電池ケース５側の表層が電解液に近い側に位置する（図１参照）。そのため、保護層１７ｂがいずれか一方のみの表層を構成する場合には、保護層１７ｂは電池ケース５側の表層を構成することが好ましい。
Thus, the protective layer 17b constitutes the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side, thereby more reliably avoiding the contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution. Can do. The protective layer 17b may constitute only one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side. That is, the protective layer 17b only needs to have at least one of the inner protective layer 17b1 and the outer protective layer 17b2. When the gasket 17 is fitted in the secondary battery 100, the surface layer on the battery case 5 side is located closer to the electrolyte than the surface layer on the sealing body 10 side (see FIG. 1). Therefore, when the protective layer 17b constitutes only one of the surface layers, the protective layer 17b preferably constitutes a surface layer on the battery case 5 side.
ガスケット１７は、例えば、押出成形等により予め形成した吸着剤含有層１７ａと保護層１７ｂとを、加熱圧着等により貼り合わせることで形成することができる。また、予め形成した吸着剤含有層１７ａの表面に、吸着剤３０を含有していない樹脂材料を塗布して保護層１７ｂを形成することで、ガスケット１７を得ることができる。また、ガスケット１７は、例えばインサート成形により形成することもできる。すなわち、予め形成した吸着剤含有層１７ａを芯材として、吸着剤含有層１７ａの表面に樹脂材料を被覆して保護層１７ｂを形成することでガスケット１７を得ることができる。
The gasket 17 can be formed, for example, by adhering an adsorbent-containing layer 17a and a protective layer 17b formed in advance by extrusion molding or the like by thermocompression bonding or the like. Moreover, the gasket 17 can be obtained by apply | coating the resin material which does not contain the adsorption agent 30 to the surface of the adsorption agent content layer 17a formed beforehand, and forming the protective layer 17b. Moreover, the gasket 17 can also be formed by insert molding, for example. That is, the gasket 17 can be obtained by forming the protective layer 17b by covering the surface of the adsorbent-containing layer 17a with a resin material using the adsorbent-containing layer 17a formed in advance as a core material.
（実施形態３）
実施形態３に係るガスケットは、第１端部において吸着剤含有層の表面が保護層で被覆されている点を除き、実施形態２に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態３に係るガスケット及び二次電池について、実施形態１及び２と異なる構成を中心に説明する。図４は、実施形態３に係るガスケットの概略構造を示す断面図である。なお、図４では、吸着剤３０を模式的に球体で示している。 (Embodiment 3)
The gasket according to Embodiment 3 has the same configuration as that of the gasket according to Embodiment 2 except that the surface of the adsorbent-containing layer is covered with a protective layer at the first end. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the third embodiment will be described focusing on configurations different from the first and second embodiments. FIG. 4 is a cross-sectional view illustrating a schematic structure of the gasket according to the third embodiment. In FIG. 4, the adsorbent 30 is schematically shown as a sphere.
実施形態３に係るガスケットは、第１端部において吸着剤含有層の表面が保護層で被覆されている点を除き、実施形態２に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態３に係るガスケット及び二次電池について、実施形態１及び２と異なる構成を中心に説明する。図４は、実施形態３に係るガスケットの概略構造を示す断面図である。なお、図４では、吸着剤３０を模式的に球体で示している。 (Embodiment 3)
The gasket according to Embodiment 3 has the same configuration as that of the gasket according to Embodiment 2 except that the surface of the adsorbent-containing layer is covered with a protective layer at the first end. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the third embodiment will be described focusing on configurations different from the first and second embodiments. FIG. 4 is a cross-sectional view illustrating a schematic structure of the gasket according to the third embodiment. In FIG. 4, the adsorbent 30 is schematically shown as a sphere.
本実施形態に係るガスケット１７は、吸着剤３０を含有する吸着剤含有層１７ａと、吸着剤含有層１７ａと電池ケース５内の電解液との接触を妨げる保護層１７ｂと、を備える。本実施形態では、保護層１７ｂは、電池ケース５側の表層全体及び封口体１０側の表層全体を構成している。すなわち、保護層１７ｂは、吸着剤含有層１７ａの円板部の上面と筒部の内周面を被覆する内側保護層１７ｂ１と、吸着剤含有層１７ａの円板部の下面と筒部の外周面を被覆する外側保護層１７ｂ２とを有する。
The gasket 17 according to the present embodiment includes an adsorbent-containing layer 17a containing the adsorbent 30 and a protective layer 17b that prevents contact between the adsorbent-containing layer 17a and the electrolytic solution in the battery case 5. In the present embodiment, the protective layer 17b constitutes the entire surface layer on the battery case 5 side and the entire surface layer on the sealing body 10 side. That is, the protective layer 17b includes an inner protective layer 17b1 that covers the upper surface of the disc portion of the adsorbent-containing layer 17a and the inner peripheral surface of the cylindrical portion, and the lower surface of the disc portion of the adsorbent-containing layer 17a and the outer periphery of the cylindrical portion. And an outer protective layer 17b2 covering the surface.
また、保護層１７ｂは、電池ケース５内に配置されるガスケット１７の第１端部１７ｓにおける吸着剤含有層１７ａの表面を被覆している。本実施形態では、保護層１７ｂは、内側保護層１７ｂ１及び外側保護層１７ｂ２に加えて、吸着剤含有層１７ａの円板部の内側面、言い換えれば吸着剤含有層１７ａの第１端部１７ｓ側の端面を被覆する第１端部側保護層１７ｂ３を有する。そして、吸着剤含有層１７ａは、第１端部１７ｓにおける円板部の上面が内側保護層１７ｂ１で被覆され、円板部の下面が外側保護層１７ｂ２で被覆され、円板部の内側面が第１端部側保護層１７ｂ３で被覆されている。
The protective layer 17 b covers the surface of the adsorbent-containing layer 17 a at the first end 17 s of the gasket 17 disposed in the battery case 5. In this embodiment, in addition to the inner protective layer 17b1 and the outer protective layer 17b2, the protective layer 17b includes the inner surface of the disc part of the adsorbent-containing layer 17a, in other words, the first end 17s side of the adsorbent-containing layer 17a. The first end side protective layer 17b3 covering the end surface of the first end side. In the adsorbent-containing layer 17a, the upper surface of the disk portion at the first end portion 17s is covered with the inner protective layer 17b1, the lower surface of the disk portion is covered with the outer protective layer 17b2, and the inner surface of the disk portion is The first end side protective layer 17b3 is covered.
電池ケース５内に配置されるガスケット１７の第１端部１７ｓは、電池ケース５外に配置されるガスケット１７の第２端部１７ｔや、金属板１１の周縁部と電池ケース５とに挟まれる部分に比べて、電解液に接触しやすい領域である。そのため、第１端部１７ｓにおける吸着剤含有層１７ａの表面を保護層１７ｂで被覆することにより、吸着剤含有層１７ａ中の吸着剤３０と電解液との接触をより確実に抑制することができる。これにより、吸着剤３０の吸着性能をより長期間維持することができ、二次電池１００の高い電池性能をより長期間維持することができる。
The first end 17 s of the gasket 17 disposed in the battery case 5 is sandwiched between the second end 17 t of the gasket 17 disposed outside the battery case 5 and the peripheral edge of the metal plate 11 and the battery case 5. Compared to the portion, it is a region that is more likely to come into contact with the electrolyte. Therefore, by covering the surface of the adsorbent-containing layer 17a at the first end portion 17s with the protective layer 17b, the contact between the adsorbent 30 in the adsorbent-containing layer 17a and the electrolytic solution can be more reliably suppressed. . Thereby, the adsorption performance of the adsorbent 30 can be maintained for a longer period, and the high battery performance of the secondary battery 100 can be maintained for a longer period.
また、保護層１７ｂは、吸着剤含有層１７ａの第１端部１７ｓ側の領域のみを被覆してもよい。この場合、ガスケットの大きさが同じであれば、保護層１７ｂが吸着剤含有層１７ａの他の領域をも被覆する場合に比べて、吸着剤含有層１７ａの大きさを大きくすることができ、したがってガスケット全体における吸着剤３０の含有量を大きくすることができる。そのため、ガスケットの水分及び／又はガスの吸着能を高めることができる。
Further, the protective layer 17b may cover only the region on the first end portion 17s side of the adsorbent-containing layer 17a. In this case, if the size of the gasket is the same, the size of the adsorbent-containing layer 17a can be increased compared to the case where the protective layer 17b also covers other regions of the adsorbent-containing layer 17a. Therefore, the content of the adsorbent 30 in the entire gasket can be increased. Therefore, the moisture and / or gas adsorption capacity of the gasket can be increased.
また、吸着剤含有層１７ａは、ガスケット１７の第２端部１７ｔにおける表面が露出している。本実施形態では、吸着剤含有層１７ａの筒部の上端面が保護層１７ｂに被覆されることなく露出している。これにより、ガスケット１７は、二次電池１００が置かれる環境の雰囲気中の水分及び／又はガスをより確実に吸着することができる。その結果、電池ケース５の内部でのガスの発生を抑制することができ、またガスケット１７の劣化を抑制することができる。したがって、二次電池１００の電池性能を向上させることができる。
Further, the surface of the adsorbent-containing layer 17a at the second end portion 17t of the gasket 17 is exposed. In the present embodiment, the upper end surface of the cylindrical portion of the adsorbent-containing layer 17a is exposed without being covered with the protective layer 17b. Thereby, the gasket 17 can adsorb | suck the water | moisture content and / or gas in the atmosphere of the environment where the secondary battery 100 is put more reliably. As a result, generation of gas inside the battery case 5 can be suppressed, and deterioration of the gasket 17 can be suppressed. Therefore, the battery performance of the secondary battery 100 can be improved.
本実施形態のガスケット１７では、内側保護層１７ｂ１、外側保護層１７ｂ２及び第１端部側保護層１７ｂ３は、一体成形されている。このようなガスケット１７は、予め形成した吸着剤含有層１７ａの表面に、吸着剤３０を含有していない樹脂材料を塗布して保護層１７ｂを形成することで得ることができる。また、ガスケット１７は、例えばインサート成形により形成することもできる。すなわち、予め形成した吸着剤含有層１７ａを芯材として、吸着剤含有層１７ａの表面に樹脂材料を被覆して保護層１７ｂを形成することでガスケット１７を得ることができる。
In the gasket 17 of this embodiment, the inner protective layer 17b1, the outer protective layer 17b2, and the first end side protective layer 17b3 are integrally formed. Such a gasket 17 can be obtained by applying a resin material not containing the adsorbent 30 to the surface of the adsorbent-containing layer 17a formed in advance to form the protective layer 17b. Moreover, the gasket 17 can also be formed by insert molding, for example. That is, the gasket 17 can be obtained by forming the protective layer 17b by covering the surface of the adsorbent-containing layer 17a with a resin material using the adsorbent-containing layer 17a formed in advance as a core material.
（実施形態４）
実施形態４に係るガスケットは、表層の少なくとも一部が吸着剤を含有する点を除き、実施形態１に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態４に係るガスケット及び二次電池について、実施形態１と異なる構成を中心に説明する。図５は、実施形態４に係るガスケットの概略構造を示す断面図である。なお、図５では、吸着剤３０を模式的に球体で示している。 (Embodiment 4)
The gasket according to the fourth embodiment is common to the configuration of the gasket according to the first embodiment except that at least a part of the surface layer contains an adsorbent. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the fourth embodiment will be described focusing on the configuration different from the first embodiment. FIG. 5 is a cross-sectional view illustrating a schematic structure of the gasket according to the fourth embodiment. In FIG. 5, the adsorbent 30 is schematically shown as a sphere.
実施形態４に係るガスケットは、表層の少なくとも一部が吸着剤を含有する点を除き、実施形態１に係るガスケットの構成と共通する。また、ガスケット以外の二次電池の構成は、実施形態１に係る二次電池と同一である。以下、実施形態４に係るガスケット及び二次電池について、実施形態１と異なる構成を中心に説明する。図５は、実施形態４に係るガスケットの概略構造を示す断面図である。なお、図５では、吸着剤３０を模式的に球体で示している。 (Embodiment 4)
The gasket according to the fourth embodiment is common to the configuration of the gasket according to the first embodiment except that at least a part of the surface layer contains an adsorbent. The configuration of the secondary battery other than the gasket is the same as that of the secondary battery according to the first embodiment. Hereinafter, the gasket and the secondary battery according to the fourth embodiment will be described focusing on the configuration different from the first embodiment. FIG. 5 is a cross-sectional view illustrating a schematic structure of the gasket according to the fourth embodiment. In FIG. 5, the adsorbent 30 is schematically shown as a sphere.
本実施形態に係るガスケット１７は、表層の少なくとも一部が吸着剤３０を含有する。より詳細には、ガスケット１７は、吸着剤含有層１７ａと、吸着剤非含有層１７ｃとを備える。吸着剤含有層１７ａは、吸着剤３０を含有する層である。吸着剤非含有層１７ｃは、例えば上述した樹脂材料のみを成形して得られる、吸着剤３０を含有しない層である。そして、吸着剤非含有層１７ｃの表面の少なくとも一部が、吸着剤含有層１７ａにより被覆されている。
In the gasket 17 according to this embodiment, at least a part of the surface layer contains the adsorbent 30. More specifically, the gasket 17 includes an adsorbent-containing layer 17a and an adsorbent-free layer 17c. The adsorbent-containing layer 17a is a layer containing the adsorbent 30. The adsorbent-free layer 17c is a layer that does not contain the adsorbent 30, for example, obtained by molding only the resin material described above. And at least a part of the surface of the adsorbent-free layer 17c is covered with the adsorbent-containing layer 17a.
本実施形態では、ガスケット１７の電池ケース５側の表層全体及び封口体１０側の表層全体が吸着剤３０を含有している。すなわち、吸着剤非含有層１７ｃの電池ケース５側の表面全体と封口体１０側の表面全体が吸着剤含有層１７ａにより被覆されている。なお、吸着剤含有層１７ａは、電池ケース５側の表層と封口体１０側の表層のいずれか一方のみを構成してもよい。すなわちガスケット１７は、電池ケース５側の表層及び封口体１０側の表層の少なくとも一方が吸着剤３０を含有していればよい。
In the present embodiment, the entire surface layer on the battery case 5 side of the gasket 17 and the entire surface layer on the sealing body 10 side contain the adsorbent 30. That is, the entire surface of the adsorbent-free layer 17c on the battery case 5 side and the entire surface on the sealing body 10 side are covered with the adsorbent-containing layer 17a. The adsorbent-containing layer 17a may constitute only one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side. That is, in the gasket 17, at least one of the surface layer on the battery case 5 side and the surface layer on the sealing body 10 side only needs to contain the adsorbent 30.
このように、吸着剤非含有層１７ｃの表面を吸着剤含有層１７ａで被覆することで、吸着剤含有層１７ａの表面を保護層１７ｂで被覆する場合に比べて、水分及び／又はガスをより吸着させやすくすることができる。また、吸着剤３０を含有しない既存のガスケットに、水分及び／又はガスの吸着機能を付与することができる。すなわち、既存のガスケットを吸着剤非含有層１７ｃとして、この表面に吸着剤含有層１７ａを設けることで、本実施形態のガスケット１７を得ることができる。
Thus, by covering the surface of the adsorbent-free layer 17c with the adsorbent-containing layer 17a, more moisture and / or gas can be obtained compared to the case where the surface of the adsorbent-containing layer 17a is covered with the protective layer 17b. It can be made easy to adsorb. In addition, an existing gasket that does not contain the adsorbent 30 can be provided with a moisture and / or gas adsorption function. That is, the gasket 17 of this embodiment can be obtained by using the existing gasket as the adsorbent-free layer 17c and providing the adsorbent-containing layer 17a on the surface.
ガスケット１７は、例えば、押出成形等により予め形成した吸着剤含有層１７ａと吸着剤非含有層１７ｃとを、加熱圧着等により貼り合わせることで形成することができる。また、予め形成した吸着剤非含有層１７ｃの表面に、吸着剤３０を含有する樹脂材料を塗布して吸着剤含有層１７ａを形成することで、ガスケット１７を得ることができる。また、ガスケット１７は、例えばインサート成形により形成することもできる。すなわち、予め形成した吸着剤非含有層１７ｃを芯材として、吸着剤非含有層１７ｃの表面に吸着剤３０を含有する樹脂材料を被覆して吸着剤含有層１７ａを形成することでガスケット１７を得ることができる。
The gasket 17 can be formed, for example, by adhering an adsorbent-containing layer 17a and an adsorbent-free layer 17c formed in advance by extrusion molding or the like by thermocompression bonding or the like. In addition, the gasket 17 can be obtained by applying a resin material containing the adsorbent 30 to the surface of the adsorbent-free layer 17c formed in advance to form the adsorbent-containing layer 17a. Moreover, the gasket 17 can also be formed by insert molding, for example. That is, the gasket 17 is formed by forming the adsorbent-containing layer 17a by coating the resin material containing the adsorbent 30 on the surface of the adsorbent-free layer 17c with the adsorbent-free layer 17c formed in advance as a core material. Obtainable.
本発明は、上述の各実施形態に限定されるものではなく、各実施形態を組み合わせたり、当業者の知識に基づいて各種の設計変更などの変形を加えることも可能であり、そのような組み合わせ、もしくは変形が加えられた実施形態も本発明の範囲に含まれる。上述の各実施形態同士、及び上述の各実施形態と変形との組合せによって生じる新たな実施形態は、組み合わされる実施形態及び変形それぞれの効果をあわせもつ。
The present invention is not limited to the above-described embodiments, and the embodiments can be combined, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. Embodiments to which modifications are made are also included in the scope of the present invention. Each of the above-described embodiments, and a new embodiment generated by the combination of each of the above-described embodiments and modifications has the effects of the combined embodiments and modifications.
実施形態１～４では、封口体１０が、金属板１１と、第１弁板１２と、インナーガスケット１３と、第２弁板１４と、ＰＴＣ素子１５と、キャップ１６とを有し、金属板１１の周縁部が、インナーガスケット１３を介してキャップ１６の周縁部にかしめられた構造を有するが、封口体１０の構造はこれに限定されるものではない。例えば、封口体１０は、金属板１１の周縁部が、インナーガスケット１３を介してキャップ１６の周縁部にかしめられていなくてもよい。
In the first to fourth embodiments, the sealing body 10 includes the metal plate 11, the first valve plate 12, the inner gasket 13, the second valve plate 14, the PTC element 15, and the cap 16, and the metal plate 11 has a structure in which the peripheral edge portion is caulked to the peripheral edge portion of the cap 16 via the inner gasket 13, but the structure of the sealing body 10 is not limited thereto. For example, in the sealing body 10, the peripheral edge of the metal plate 11 may not be caulked to the peripheral edge of the cap 16 via the inner gasket 13.
実施形態１～４では、二次電池１００として、リチウムイオン二次電池を具体例に挙げて説明したが、本発明はこれに限定されるものではない。また、ガスケット１７は、４層以上の構造であってもよく、例えば吸着剤含有層１７ａと保護層１７ｂとの間、あるいは吸着剤含有層１７ａと吸着剤非含有層１７ｃとの間に、さらなる層が設けられてもよい。
In the first to fourth embodiments, a lithium ion secondary battery has been described as a specific example of the secondary battery 100, but the present invention is not limited to this. Further, the gasket 17 may have a structure of four or more layers, for example, between the adsorbent-containing layer 17a and the protective layer 17b, or between the adsorbent-containing layer 17a and the non-adsorbent-containing layer 17c. A layer may be provided.
なお、上述の各実施の形態に係る発明は、以下に記載する項目によって特定されてもよい。
［項目１］
電池ケースと、当該電池ケースの開口部を封口する封口体との間に設けられるガスケットであって、
水分及び電池ケース内で発生するガスの少なくとも一方を吸着する吸着剤を含有することを特徴とするガスケット。
［項目２］
前記吸着剤を含有する吸着剤含有層と、
前記吸着剤含有層の表面の少なくとも一部を被覆し、前記吸着剤含有層と前記電池ケース内の電解液との接触を妨げる保護層と、
を備える項目１に記載のガスケット。
［項目３］
前記保護層は、前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方を構成する項目２に記載のガスケット。
［項目４］
前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記保護層は、前記第１端部において前記吸着剤含有層の表面を被覆する項目２又は３に記載のガスケット。
［項目５］
前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記吸着剤含有層は、前記第２端部において表面が露出する項目２乃至４のいずれか１項に記載のガスケット。
［項目６］
ガスケットの表層の少なくとも一部が前記吸着剤を含有する項目１に記載のガスケット。
［項目７］
前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方が、前記吸着剤を含有する項目６に記載のガスケット。
［項目８］
正極板及び負極板がセパレータとともに捲回された電極群と、
前記電極群を収容する電池ケースと、
前記電池ケースの開口部を封口する封口体と、
前記電池ケースと前記封口体との間に設けられる項目１乃至７のいずれか１項に記載のガスケットと、
を備えることを特徴とする二次電池。 The invention according to each of the above embodiments may be specified by the items described below.
[Item 1]
A gasket provided between a battery case and a sealing body that seals an opening of the battery case,
A gasket comprising an adsorbent that adsorbs at least one of moisture and a gas generated in a battery case.
[Item 2]
An adsorbent-containing layer containing the adsorbent;
A protective layer that covers at least a portion of the surface of the adsorbent-containing layer and prevents contact between the adsorbent-containing layer and the electrolyte in the battery case;
The gasket according to item 1, comprising:
[Item 3]
The gasket according to Item 2, wherein the protective layer forms at least one of a surface layer on the battery case side and a surface layer on the sealing body side.
[Item 4]
The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
4. The gasket according to item 2 or 3, wherein the protective layer covers the surface of the adsorbent-containing layer at the first end.
[Item 5]
The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
The gasket according to any one of Items 2 to 4, wherein the adsorbent-containing layer has a surface exposed at the second end portion.
[Item 6]
The gasket according to item 1, wherein at least a part of a surface layer of the gasket contains the adsorbent.
[Item 7]
Item 7. The gasket according to item 6, wherein at least one of the surface layer on the battery case side and the surface layer on the sealing body side contains the adsorbent.
[Item 8]
An electrode group in which a positive electrode plate and a negative electrode plate are wound together with a separator;
A battery case housing the electrode group;
A sealing body for sealing the opening of the battery case;
The gasket according to any one of items 1 to 7, provided between the battery case and the sealing body,
A secondary battery comprising:
［項目１］
電池ケースと、当該電池ケースの開口部を封口する封口体との間に設けられるガスケットであって、
水分及び電池ケース内で発生するガスの少なくとも一方を吸着する吸着剤を含有することを特徴とするガスケット。
［項目２］
前記吸着剤を含有する吸着剤含有層と、
前記吸着剤含有層の表面の少なくとも一部を被覆し、前記吸着剤含有層と前記電池ケース内の電解液との接触を妨げる保護層と、
を備える項目１に記載のガスケット。
［項目３］
前記保護層は、前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方を構成する項目２に記載のガスケット。
［項目４］
前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記保護層は、前記第１端部において前記吸着剤含有層の表面を被覆する項目２又は３に記載のガスケット。
［項目５］
前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記吸着剤含有層は、前記第２端部において表面が露出する項目２乃至４のいずれか１項に記載のガスケット。
［項目６］
ガスケットの表層の少なくとも一部が前記吸着剤を含有する項目１に記載のガスケット。
［項目７］
前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方が、前記吸着剤を含有する項目６に記載のガスケット。
［項目８］
正極板及び負極板がセパレータとともに捲回された電極群と、
前記電極群を収容する電池ケースと、
前記電池ケースの開口部を封口する封口体と、
前記電池ケースと前記封口体との間に設けられる項目１乃至７のいずれか１項に記載のガスケットと、
を備えることを特徴とする二次電池。 The invention according to each of the above embodiments may be specified by the items described below.
[Item 1]
A gasket provided between a battery case and a sealing body that seals an opening of the battery case,
A gasket comprising an adsorbent that adsorbs at least one of moisture and a gas generated in a battery case.
[Item 2]
An adsorbent-containing layer containing the adsorbent;
A protective layer that covers at least a portion of the surface of the adsorbent-containing layer and prevents contact between the adsorbent-containing layer and the electrolyte in the battery case;
The gasket according to item 1, comprising:
[Item 3]
The gasket according to Item 2, wherein the protective layer forms at least one of a surface layer on the battery case side and a surface layer on the sealing body side.
[Item 4]
The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
4. The gasket according to item 2 or 3, wherein the protective layer covers the surface of the adsorbent-containing layer at the first end.
[Item 5]
The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
The gasket according to any one of Items 2 to 4, wherein the adsorbent-containing layer has a surface exposed at the second end portion.
[Item 6]
The gasket according to item 1, wherein at least a part of a surface layer of the gasket contains the adsorbent.
[Item 7]
Item 7. The gasket according to item 6, wherein at least one of the surface layer on the battery case side and the surface layer on the sealing body side contains the adsorbent.
[Item 8]
An electrode group in which a positive electrode plate and a negative electrode plate are wound together with a separator;
A battery case housing the electrode group;
A sealing body for sealing the opening of the battery case;
The gasket according to any one of items 1 to 7, provided between the battery case and the sealing body,
A secondary battery comprising:
１ 正極板、 ２ 負極板、 ３ セパレータ、 ４ 電極群、 ５ 電池ケース、 １０ 封口体、 １７ ガスケット、 １７ａ 吸着剤含有層、 １７ｂ 保護層、 １７ｓ 第１端部、 １７ｔ 第２端部、 ３０ 吸着剤、 １００ 二次電池。
1 positive electrode plate, 2 negative electrode plate, 3 separator, 4 electrode group, 5 battery case, 10 sealing body, 17 gasket, 17a adsorbent containing layer, 17b protective layer, 17s first end, 17t second end, 30 adsorption Agent, 100 secondary battery.
Claims (8)
- 電池ケースと、当該電池ケースの開口部を封口する封口体との間に設けられるガスケットであって、
水分及び電池ケース内で発生するガスの少なくとも一方を吸着する吸着剤を含有することを特徴とするガスケット。 A gasket provided between a battery case and a sealing body that seals an opening of the battery case,
A gasket comprising an adsorbent that adsorbs at least one of moisture and a gas generated in a battery case. - 前記吸着剤を含有する吸着剤含有層と、
前記吸着剤含有層の表面の少なくとも一部を被覆し、前記吸着剤含有層と前記電池ケース内の電解液との接触を妨げる保護層と、
を備える請求項１に記載のガスケット。 An adsorbent-containing layer containing the adsorbent;
A protective layer that covers at least a portion of the surface of the adsorbent-containing layer and prevents contact between the adsorbent-containing layer and the electrolyte in the battery case;
A gasket according to claim 1. - 前記保護層は、前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方を構成する請求項２に記載のガスケット。 The gasket according to claim 2, wherein the protective layer constitutes at least one of a surface layer on the battery case side and a surface layer on the sealing body side.
- 前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記保護層は、前記第１端部において前記吸着剤含有層の表面を被覆する請求項２又は３に記載のガスケット。 The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
The gasket according to claim 2 or 3, wherein the protective layer covers a surface of the adsorbent-containing layer at the first end portion. - 前記ガスケットは、電池ケース内に配置される第１端部と、電池ケース外に配置される第２端部とを有し、
前記吸着剤含有層は、前記第２端部において表面が露出する請求項２乃至４のいずれか１項に記載のガスケット。 The gasket has a first end disposed inside the battery case and a second end disposed outside the battery case;
The gasket according to any one of claims 2 to 4, wherein a surface of the adsorbent-containing layer is exposed at the second end portion. - ガスケットの表層の少なくとも一部が前記吸着剤を含有する請求項１に記載のガスケット。 The gasket according to claim 1, wherein at least a part of a surface layer of the gasket contains the adsorbent.
- 前記電池ケース側の表層及び前記封口体側の表層の少なくとも一方が、前記吸着剤を含有する請求項６に記載のガスケット。 The gasket according to claim 6, wherein at least one of a surface layer on the battery case side and a surface layer on the sealing body side contains the adsorbent.
- 正極板及び負極板がセパレータとともに捲回された電極群と、
前記電極群を収容する電池ケースと、
前記電池ケースの開口部を封口する封口体と、
前記電池ケースと前記封口体との間に設けられる請求項１乃至７のいずれか１項に記載のガスケットと、
を備えることを特徴とする二次電池。 An electrode group in which a positive electrode plate and a negative electrode plate are wound together with a separator;
A battery case housing the electrode group;
A sealing body for sealing the opening of the battery case;
The gasket according to any one of claims 1 to 7, provided between the battery case and the sealing body,
A secondary battery comprising:
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-239624 | 2012-10-30 | ||
| JP2012239624A JP2016012394A (en) | 2012-10-30 | 2012-10-30 | Gasket and secondary battery |
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| Publication Number | Publication Date |
|---|---|
| WO2014068945A1 true WO2014068945A1 (en) | 2014-05-08 |
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ID=50626894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2013/006371 WO2014068945A1 (en) | 2012-10-30 | 2013-10-29 | Gasket and secondary battery |
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| Country | Link |
|---|---|
| JP (1) | JP2016012394A (en) |
| WO (1) | WO2014068945A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980172A (en) * | 2019-03-28 | 2019-07-05 | 安徽泰能新能源科技有限公司 | A kind of insulation spacer and the cylindrical lithium battery with the gasket |
| CN110061156A (en) * | 2019-05-09 | 2019-07-26 | 江苏恒驰动力科技有限公司 | A kind of pole piece Integral square cover board |
| CN110061156B (en) * | 2019-05-09 | 2024-05-24 | 江苏恒驰动力科技有限公司 | Square apron of pole piece integral type |
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| JPH0644951A (en) * | 1992-07-24 | 1994-02-18 | Toshiba Battery Co Ltd | Square nickel-hydrigen battery |
| JP2000260438A (en) * | 1999-03-04 | 2000-09-22 | Hitachi Maxell Ltd | Alkali manganese battery |
| JP2000353505A (en) * | 1999-06-10 | 2000-12-19 | Matsushita Electric Ind Co Ltd | Flat organic electrolyte battery |
| JP2010040407A (en) * | 2008-08-07 | 2010-02-18 | Sumitomo Electric Fine Polymer Inc | Gasket and sealed type secondary battery |
| WO2011114632A1 (en) * | 2010-03-16 | 2011-09-22 | パナソニック株式会社 | Capacitor |
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- 2012-10-30 JP JP2012239624A patent/JP2016012394A/en active Pending
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| JP2000260438A (en) * | 1999-03-04 | 2000-09-22 | Hitachi Maxell Ltd | Alkali manganese battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109980172A (en) * | 2019-03-28 | 2019-07-05 | 安徽泰能新能源科技有限公司 | A kind of insulation spacer and the cylindrical lithium battery with the gasket |
| CN110061156A (en) * | 2019-05-09 | 2019-07-26 | 江苏恒驰动力科技有限公司 | A kind of pole piece Integral square cover board |
| CN110061156B (en) * | 2019-05-09 | 2024-05-24 | 江苏恒驰动力科技有限公司 | Square apron of pole piece integral type |
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|---|---|
| JP2016012394A (en) | 2016-01-21 |
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