CN113994520A - Stacked battery and method for manufacturing stacked battery - Google Patents
Stacked battery and method for manufacturing stacked battery Download PDFInfo
- Publication number
- CN113994520A CN113994520A CN202080043216.XA CN202080043216A CN113994520A CN 113994520 A CN113994520 A CN 113994520A CN 202080043216 A CN202080043216 A CN 202080043216A CN 113994520 A CN113994520 A CN 113994520A
- Authority
- CN
- China
- Prior art keywords
- layer
- electrode assembly
- membrane electrode
- stacked
- insulating sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 30
- 239000012528 membrane Substances 0.000 claims abstract description 220
- 239000010410 layer Substances 0.000 claims abstract description 180
- 239000000463 material Substances 0.000 claims abstract description 144
- 239000012790 adhesive layer Substances 0.000 claims abstract description 60
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims description 60
- 238000004804 winding Methods 0.000 claims description 38
- 238000002360 preparation method Methods 0.000 claims description 24
- 239000007772 electrode material Substances 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 description 29
- 230000004048 modification Effects 0.000 description 28
- 238000012986 modification Methods 0.000 description 28
- 239000011230 binding agent Substances 0.000 description 27
- 239000002346 layers by function Substances 0.000 description 23
- 239000006183 anode active material Substances 0.000 description 20
- 239000007774 positive electrode material Substances 0.000 description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 16
- 229910001416 lithium ion Inorganic materials 0.000 description 16
- -1 polypropylene Polymers 0.000 description 13
- 239000000203 mixture Substances 0.000 description 9
- 239000000565 sealant Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 229920003048 styrene butadiene rubber Polymers 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011888 foil Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 229910010272 inorganic material Inorganic materials 0.000 description 5
- 239000011147 inorganic material Substances 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000011368 organic material Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 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
- 229920002396 Polyurea Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- SBWRUMICILYTAT-UHFFFAOYSA-K lithium;cobalt(2+);phosphate Chemical compound [Li+].[Co+2].[O-]P([O-])([O-])=O SBWRUMICILYTAT-UHFFFAOYSA-K 0.000 description 1
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 1
- LRVBJNJRKRPPCI-UHFFFAOYSA-K lithium;nickel(2+);phosphate Chemical compound [Li+].[Ni+2].[O-]P([O-])([O-])=O LRVBJNJRKRPPCI-UHFFFAOYSA-K 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Cell Separators (AREA)
Abstract
The stacked battery includes: the exterior package comprises a1 st base material and a2 nd base material each comprising a metal layer and a resin adhesive layer provided on the inner surface of the metal layer, and a sealing portion for welding the resin adhesive layer of the 1 st base material and the resin adhesive layer of the 2 nd base material and forming a sealed space between the 1 st base material and the 2 nd base material. The stacked battery further includes: a membrane electrode assembly provided in the sealed space and having a plurality of 1 st electrode plates and a plurality of 2 nd electrode plates alternately stacked in a stacking direction; a pair of lugs provided at both ends of the membrane electrode assembly in the 1 st direction; and an insulating sheet wound around the membrane electrode assembly when viewed in the 1 st direction.
Description
[ technical field ]
The present invention relates to a stacked battery and a method for manufacturing the stacked battery.
[ background art ]
For example, as proposed in patent document 1, a laminate-type battery in which positive electrode plates and negative electrode plates are alternately laminated is widely used. As an example of the stacked battery, a lithium ion secondary battery is cited. One of the characteristics of the lithium ion secondary battery is that: has larger capacity compared with other laminated batteries. Lithium ion secondary batteries having such characteristics are now expected to be further popularized in various applications such as vehicle-mounted applications and residential applications.
The stacked battery includes: a membrane electrode assembly comprising a plurality of positive electrode plates (1 st electrode plates) and a plurality of negative electrode plates (2 nd electrode plates) which are alternately stacked. The membrane electrode assembly is disposed in an exterior package (laminate film type exterior package) having a metal layer and a resin adhesive layer, and heat-sealed so as to be sealed simultaneously with the electrolyte solution.
[ Prior art documents ]
[ patent document ]
[ patent document 1] International publication No. 2017/098995
[ summary of the invention ]
[ problem to be solved by the invention ]
However, when the stacked battery is used, a force due to vibration, impact, or the like may be applied from the outside. Since the laminated film type exterior packaging body is thin, a force from the outside is easily transmitted to the inside of the exterior packaging body, and there is a risk that the 1 st electrode plate and the 2 nd electrode plate are positionally displaced from each other by such a force.
The present invention has been made in view of such circumstances, and an object thereof is to: provided are a laminate type battery and a method for manufacturing the laminate type battery, wherein the occurrence of positional deviation of electrode plates can be prevented even when external force is applied.
[ means for solving problems ]
The present invention provides a stacked battery including:
an exterior package having: a1 st base material and a2 nd base material each including a metal layer and a resin adhesive layer provided on an inner surface of the metal layer, and a sealing portion that welds the resin adhesive layer of the 1 st base material and the resin adhesive layer of the 2 nd base material and forms a sealed space between the 1 st base material and the 2 nd base material;
a membrane electrode assembly that is disposed in the sealed space and has a plurality of 1 st electrode plates and a plurality of 2 nd electrode plates alternately stacked in a stacking direction;
a pair of tabs provided at both end portions of the membrane electrode assembly in the 1 st direction; and
an insulating sheet wound around the membrane electrode assembly when viewed in the 1 st direction.
In the stacked type battery according to the present invention,
the insulating sheet has: a1 st end portion provided at one end side in an outer peripheral direction of the membrane electrode assembly and a2 nd end portion provided at the other end side as viewed in the 1 st direction,
the insulating sheet is wound around the membrane electrode assembly from the 1 st end portion and extends beyond the 1 st end portion to form an overlapping portion in which the insulating sheets are overlapped with each other,
the insulating sheets are joined to each other at the overlapping portion.
In the stacked type battery according to the present invention,
the 1 st end portion and the 2 nd end portion are arranged on one side of the membrane electrode assembly in a2 nd direction perpendicular to the stacking direction when viewed in the 1 st direction.
In the stacked type battery according to the present invention,
the insulating sheet has an adhesive layer provided on the membrane electrode assembly side.
In the stacked type battery according to the present invention,
the insulating sheet is welded to the membrane electrode assembly.
In the stacked type battery according to the present invention,
the outermost surface in the stacking direction of the membrane electrode assembly is composed of a layer to be joined containing an adhesive,
the insulating sheet has a bonding layer provided on the membrane electrode bonding body side,
the bonding layer and the bonded layer are bonded to each other.
In the stacked type battery according to the present invention,
the bonding layer is formed of a bonding material,
the bonding material contains the same material as the material constituting the adhesive.
In the stacked type battery according to the present invention,
the 2 nd electrode plate includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is formed of the electrode active material layer.
In the stacked type battery according to the present invention,
the 2 nd electrode plate includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is composed of the electrode active material layer,
the bonding layer is formed of a bonding material,
the bonding material includes a resin material having a polar group.
The method for manufacturing a stacked battery according to the present invention includes:
a1 st preparation step of preparing a membrane electrode assembly having a plurality of 1 st electrode plates and a plurality of 2 nd electrode plates alternately stacked in a stacking direction;
a2 nd preparation step of preparing a1 st base material and a2 nd base material each including a metal layer and a resin adhesion layer provided on one side of the metal layer;
a tab mounting step of mounting a pair of tabs at both end portions of the membrane electrode assembly in a1 st direction;
a winding step of winding an insulating sheet around the membrane electrode assembly when viewed in the 1 st direction; and
and a sealing step of, after the winding step, disposing the membrane electrode assembly between the 1 st base material and the 2 nd base material, welding the resin adhesive layer of the 1 st base material and the resin adhesive layer of the 2 nd base material, and sealing the membrane electrode assembly between the 1 st base material and the 2 nd base material.
In the method for manufacturing a stacked battery according to the present invention,
the insulating sheet has: a1 st end portion provided at one end side in an outer peripheral direction of the membrane electrode assembly and a2 nd end portion provided at the other end side as viewed in the 1 st direction,
in the winding step, the insulating sheets are wound around the membrane electrode assembly from the 1 st end portion and extended beyond the 1 st end portion, and an overlapping portion is formed by overlapping the insulating sheets, and the insulating sheets are joined to each other at the overlapping portion.
In the method for manufacturing a stacked battery according to the present invention,
in the winding step, the 1 st end portion and the 2 nd end portion are arranged on one side of the membrane electrode assembly in a2 nd direction perpendicular to the stacking direction when viewed in the 1 st direction.
In the method for manufacturing a stacked battery according to the present invention,
the winding process is performed after the tab mounting process.
In the method for manufacturing a stacked battery according to the present invention,
the winding process is performed before the tab mounting process.
In the method for manufacturing a stacked battery according to the present invention,
the insulating sheet has an adhesive layer provided on the membrane electrode assembly side,
in the rolling step, the outermost surface of the membrane electrode assembly in the stacking direction is bonded to the adhesive layer.
In the method for manufacturing a stacked battery according to the present invention,
the method further comprises, after the winding step: and a welding step of welding the insulating sheet to the membrane electrode assembly.
In the method for manufacturing a stacked battery according to the present invention,
the outermost surface of the membrane electrode assembly prepared in the 1 st preparation step in the stacking direction is formed of a layer to be joined including an adhesive,
the insulating sheet has a bonding layer provided on the membrane electrode bonding body side,
in the winding step, the joining layer and the joined layer are joined to each other.
In the method for manufacturing a stacked battery according to the present invention,
the bonding layer is formed of a bonding material,
the bonding material contains the same material as the material constituting the adhesive.
In the method for manufacturing a stacked battery according to the present invention,
the 2 nd electrode plate prepared in the 1 st preparation step includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is formed of the electrode active material layer.
In the method for manufacturing a stacked battery according to the present invention,
the 2 nd electrode plate prepared in the 1 st preparation step includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is composed of the electrode active material layer,
the bonding layer is formed of a bonding material,
the bonding material includes a resin material having a polar group.
[ Effect of the invention ]
According to the present invention, even when an external force is applied, the electrode plate can be prevented from being displaced.
[ description of the drawings ]
Fig. 1 is a perspective view showing a stacked battery according to an embodiment.
Fig. 2 is a perspective view showing a membrane electrode assembly and an insulating sheet included in the stacked cell of fig. 1.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a partial cross-sectional view of the membrane electrode assembly of fig. 2, as viewed in the 2 nd direction d 2.
Fig. 5 is a sectional view of the stacked battery of fig. 1 as viewed in the 1 st direction d 1.
Fig. 6 is a view showing the stacked battery of fig. 5 except for an exterior package.
Fig. 7 is a perspective view showing a modification (1 st modification) of fig. 2.
Fig. 8 is a partial cross-sectional view of the membrane electrode assembly of fig. 2, as viewed in the 2 nd direction d2, according to one modification (5 th modification, 6 th modification, and 8 th modification).
Fig. 9 is a partial cross-sectional view of the membrane electrode assembly of fig. 2, as viewed in the 2 nd direction d2, according to a modification (7 th modification).
Fig. 10 is a partial cross-sectional view showing a modification (9 th modification) of fig. 4.
[ detailed description of the invention ]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the specification, the scale, the vertical and horizontal size ratios, and the like are appropriately changed and exaggerated from the actual ones for the convenience of understanding.
[ stacked type Battery ]
Fig. 1 to 6 are views for explaining a stacked battery according to an embodiment of the present invention.
As shown in fig. 1 and 2, the stacked battery 1 according to the present embodiment includes: an outer package 40; a membrane electrode assembly 5 housed in the exterior package 40; a pair of tabs 16, 26 connected to the membrane electrode assembly 5; an insulating sheet 50 wound around the membrane electrode assembly 5. The exterior package 40 accommodates the membrane electrode assembly 5 therein. The lugs 16 and 26 extend from the inside to the outside of the outer package 40. In the field of stationary installations such as houses and power grid feeding and in the field of vehicles such as electric vehicles, a module configured by combining a plurality of stacked batteries 1 is used. The plurality of stacked batteries 1 are electrically connected to each other through the tabs 16 and 26. The membrane electrode assembly 5 is held around the insulating sheet 50 in order to prevent positional displacement of electrode plates 10X and 20Y described later.
Hereinafter, each constituent element of the stacked battery 1 will be described.
(exterior packaging body)
The exterior package 40 is a packaging material for sealing the film electrode assembly 5. The exterior package 40 includes: a1 st base material 41 (upper outer package), and a2 nd base material 42 (lower outer package) facing the 1 st base material 41 (see fig. 5). The 1 st base material 41 and the 2 nd base material 42 according to the present embodiment are configured as separate bodies. The 2 nd base material 42 is formed into a sheet shape. On the other hand, the 1 st substrate 41 is formed in a convex shape. That is, the 1 st substrate 41 has: a peripheral portion 43, and a bulging portion 44 bulging outward (opposite to the 2 nd base material 42 side) with respect to the peripheral portion 43. The bulging portion 44 defines a sealed space 45 between the 1 st base material 41 and the 2 nd base material 42. The membrane electrode assembly 5 is accommodated in the sealed space 45. Such a bulging portion 44 is formed by, for example, pressing (spinning) a desired region of the sheet-like 1 st base material 41. In this case, the peripheral portion 43 and the expanded portion 44 are integrally formed.
The outer package 40 may have flexibility. The 1 st substrate 41 and the 2 nd substrate 42 of the exterior package 40 are respectively constituted by a laminated film having a metal layer 40a and a resin adhesive layer 40b provided on one side of the metal layer 40 a. The metal layer 40a may have high gas barrier property and formability. Such a metal layer 40a may be formed of a metal material such as aluminum foil or stainless steel foil. The resin adhesive layer 40b is located on the inner surface of the metal layer 40a, and functions as a sealing layer for bonding the metal layer 40 a. The resin adhesive layer 40b may have, in addition to adhesiveness, insulation properties, chemical resistance, thermoplasticity, and the like. Such a resin adhesive layer 40b can be formed of a resin material such as polypropylene, modified polypropylene, low-density polypropylene, ionomer, ethylene vinyl acetate, or the like.
The stacked-type battery 1 according to the present embodiment can be produced by: the membrane electrode assembly 5 is disposed between the 1 st substrate 41 and the 2 nd substrate 42, and then subjected to lamination processing. That is, in the outer peripheral edge portion of the outer package 40, the resin adhesive layers 40b formed on the inner surfaces of the 1 st base material 41 and the 2 nd base material 42 are heat-sealed (heat-welded) to form the seal portion 46. Thereby, the 1 st substrate 41 and the 2 nd substrate 42 are joined, and the membrane electrode assembly 5 is accommodated in the sealed space 45 in which the inside of the exterior package 40 is sealed.
(Membrane electrode Assembly)
The membrane electrode assembly 5 includes: the electrode plates 10X and 20Y include positive electrode plates 10X (1 st electrode plate) and negative electrode plates 20Y (2 nd electrode plate) alternately stacked in the stacking direction dL.
In the present embodiment, an example in which the membrane electrode assembly 5 constitutes a lithium ion secondary battery will be described. In this example, the 1 st electrode plate constitutes the positive electrode plate 10X, and the 2 nd electrode plate constitutes the negative electrode plate 20Y. However, as will be understood from the description of the operational effects described below, the 1 st electrode plate may constitute the negative electrode plate 20Y, and the 2 nd electrode plate may constitute the positive electrode plate 10X. The present invention is not limited to lithium ion secondary batteries, and can be widely applied to a membrane electrode assembly 5 in which a1 st electrode plate and a2 nd electrode plate are alternately stacked.
As shown in fig. 1 to 6, the membrane electrode assembly 5 includes a plurality of positive electrode plates 10X and a plurality of negative electrode plates 20Y. The positive electrode plates 10X and the negative electrode plates 20Y are alternately laminated in this order in the lamination direction dL. In the present embodiment, the negative electrode plates 20Y are disposed on the lowermost part and the uppermost part of the membrane electrode assembly 5 in the stacking direction dL. The membrane electrode assembly 5 and the stacked cell 1 have a flat shape as a whole, have a small thickness in the stacking direction dL, and extend in the directions d1 and d2 perpendicular to the stacking direction dL.
In the illustrated example, positive electrode plate 10X and negative electrode plate 20Y integrally have rectangular outer peripheral outlines when viewed in the lamination direction dL. The stacked battery 1 includes: a1 st direction d1 which is a direction in which the pair of tabs 16, 26 are arranged; a2 nd direction d2 perpendicular to the 1 st direction d 1. In the illustrated example, the 1 st direction d1 corresponds to the longitudinal direction (longitudinal direction) of the stacked cell 1, and the 2 nd direction d2 corresponds to the lateral direction (width direction) of the stacked cell 1. However, the 1 st direction d1 may correspond to the short side direction of the stacked cell 1, and the 2 nd direction d2 may correspond to the long side direction of the stacked cell 1. The lamination direction dL is perpendicular to both the 1 st direction d1 and the 2 nd direction d 2. The positive electrode plates 10X and the negative electrode plates 20Y are arranged alternately in the 1 st direction d 1. More specifically, the plurality of positive electrode plates 10X are disposed closer to one side (the right side in fig. 3) in the 1 st direction d1, and the plurality of negative electrode plates 20Y are disposed closer to the other side (the left side in fig. 3) in the 1 st direction d 1. The positive electrode plate 10X and the negative electrode plate 20Y overlap each other in the stacking direction dL at the center portion (a positive electrode effective region b1 and a negative electrode effective region b2 described later) in the 1 st direction d 1.
As shown, the positive electrode plate 10X has a sheet-like outer shape. The positive electrode plate 10X has: positive electrode collector 11X (1 st electrode collector); and a positive electrode active material layer 12X (1 st electrode active material layer) provided on the positive electrode current collector 11X. The positive electrode active material layer 12X has a rectangular outer peripheral contour. In the lithium ion secondary battery, the positive electrode plate 10X stores lithium ions during discharge and releases lithium ions during charge.
The positive electrode current collector 11X has, as main surfaces, a1 st surface 11a and a2 nd surface 11b located on opposite sides to each other. The positive electrode active material layer 12X is formed on at least one of the 1 st surface 11a and the 2 nd surface 11b of the positive electrode collector 11X. In the present embodiment, the positive electrode active material layers 12X are provided on both sides of the positive electrode current collector 11X of each positive electrode plate 10X, and each positive electrode plate 10X may be configured in the same manner.
The positive electrode collector 11X and the positive electrode active material layer 12X can be prepared by various methods using various materials that can be suitably used for the stacked battery 1 (lithium ion secondary battery). As an example, the positive electrode setThe electric body 11X may be formed of aluminum foil. The positive electrode active material layer 12X may include, for example: a positive electrode active material, a conductive auxiliary agent, and a binder serving as a binder. The positive electrode active material layer 12X can be prepared by: a slurry for a positive electrode obtained by dispersing a positive electrode active material, a conductive auxiliary agent, and a binder in a solvent is applied to a material to be the positive electrode current collector 11X and cured. As the positive electrode active material, for example, a compound represented by the general formula LiM is usedxOy(wherein M represents 1 or 2 or more metals, and x and y represent the composition ratio of the metal M to the oxygen O). Specific examples of the lithium metal compound include lithium cobaltate, lithium nickelate, lithium manganate, lithium nickel cobalt aluminate, lithium nickel manganate, and the like. As another example of the positive electrode active material, for example, a compound represented by the general formula LiM is usedxPyOz(wherein M represents 1 or 2 or more metals, and x, y and z represent the composition ratio of the metal M, phosphorus P and oxygen O). Specific examples of the lithium metal phosphate include lithium iron phosphate, lithium cobalt phosphate, lithium nickel phosphate, and lithium manganese phosphate. As the conductive assistant, graphite powder, acetylene black, or the like can be used. As the binder, polyvinylidene fluoride or the like can be used.
As shown in fig. 3, positive electrode current collector 11X has: a positive electrode connection region a1 (1 st connection region) and a positive electrode effective region b1 (1 st effective region) adjacent to each other. The positive electrode active material layer 12X is disposed only in the positive electrode effective region b1 of the positive electrode current collector 11X. The positive electrode effective region b1 has a rectangular outer peripheral contour, and is a region where the positive electrode active material layer 12X is provided as a whole. The positive electrode connection region a1 and the positive electrode effective region b1 are arranged in the 1 st direction d1 of the positive electrode plate 10X. The positive electrode connection region a1 is located further to the outside (the right side in fig. 3) of the positive electrode plate 10X in the 1 st direction d1 than the positive electrode effective region b 1.
The plurality of positive electrode collectors 11X are joined to each other in the positive electrode connecting region a1 by resistance welding, ultrasonic welding, tape bonding, welding, or the like, and are electrically connected to each other. In this way, the positive electrode connection region a1 of each positive electrode current collector 11X constitutes the positive electrode connection portion 13 (the 1 st connection portion). The positive electrode connecting portion 13 includes: the 1 st surface 13a as the 1 st substrate 41 side surface; the 2 nd surface 13b as the 2 nd substrate 42 side surface. The 1 st surface 13a corresponds to the 1 st surface 11a in the positive electrode connection region a1 of the positive electrode current collector 11X disposed closest to the 1 st substrate 41 among the plurality of positive electrode current collectors 11X. The 2 nd surface 13b corresponds to the 2 nd surface 11b in the positive electrode connection region a1 of the positive electrode current collector 11X disposed closest to the 2 nd substrate 42 among the plurality of positive electrode current collectors 11X. In the present embodiment, the positive electrode tab 16 (1 st tab) is electrically connected to the 2 nd surface 13 b.
On the other hand, as shown in fig. 3, when viewed in the stacking direction dL, the positive electrode effective region b1 is provided in a region of the negative electrode plate 20Y facing the negative electrode active material layer 22Y described later. Therefore, the size of the positive electrode effective region b1 of the positive electrode plate 10X in the 1 st direction d1 is smaller than the size of the negative electrode effective region b2 of the negative electrode plate 20Y in the 1 st direction d 1. In addition, the size of the positive electrode plate 10X in the 2 nd direction d2 is smaller than the size of the negative electrode plate 20Y in the 2 nd direction d 2. With such a configuration of the positive electrode effective region b1, lithium can be prevented from being deposited from the negative electrode active material layer 22Y.
Next, negative electrode plate 20Y will be explained. Like the positive electrode plate 10X, the negative electrode plate 20Y also has a sheet-like outer shape. The negative electrode plate 20Y has: the negative electrode current collector 21Y (the 2 nd electrode current collector); and an anode active material layer 22Y (2 nd electrode active material layer) provided on the anode current collector 21Y. The anode active material layer 22Y has a rectangular outer peripheral contour. In the lithium ion secondary battery, the negative electrode plate 20Y emits lithium ions at the time of discharge and stores lithium ions at the time of charge.
The negative electrode current collector 21Y has a1 st surface 21a and a2 nd surface 21b located on opposite sides from each other as main surfaces. The anode active material layer 22Y is formed on at least one of the 1 st surface 21a and the 2 nd surface 21b of the anode current collector 21Y. In the present embodiment, the negative electrode active material layers 22Y are provided on both sides of the negative electrode current collector 21Y of each negative electrode plate 20Y, and the negative electrode plates 20Y may be configured in the same manner. The negative electrode active material layer 22Y may not be provided on the 1 st surface 21a of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 1 st substrate 41 side. In addition, the negative electrode active material layer 22Y may not be provided on the 2 nd surface 21b of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 2 nd substrate 42 side. In the present embodiment, from the viewpoint of improving the insulation properties, the negative electrode active material layer 22Y is also provided on the 1 st surface 21a of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 1 st substrate 41 and the 2 nd surface 21b of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 2 nd substrate 42, respectively. That is, the outermost surfaces 5a, 5b (the outermost surface 5a on the 1 st substrate 41 side and the outermost surface 5b on the 2 nd substrate 42 side) of the membrane electrode assembly 5 in the stacking direction dL are respectively constituted by the anode active material layer 22Y.
The anode current collector 21Y and the anode active material layer 22Y may be prepared by various methods using various materials that can be suitably used for the stacked-type battery 1 (lithium-ion secondary battery). As one example, the negative electrode collector 21Y is formed of, for example, a copper foil. The anode active material layer 22Y may include, for example: a negative electrode active material, a binder serving as a binder, and a thickener. The anode active material layer 22Y may be prepared by: a slurry for a negative electrode obtained by dispersing a negative electrode active material, a binder, and a thickener in a solvent is applied to a material to be the negative electrode current collector 21Y and cured. As the negative electrode active material, for example, carbon powder, graphite powder, or the like is used. As the binder, styrene butadiene rubber or the like can be used. As the thickener, carboxymethyl cellulose or the like can be used.
As shown in fig. 3, the negative electrode current collector 21Y includes: a negative electrode connection region a2 (2 nd connection region) and a negative electrode effective region b2 (2 nd effective region) adjacent to each other. The anode active material layer 22Y is disposed only in the anode effective region b2 of the anode current collector 21Y. The negative electrode effective region b2 has a rectangular outer peripheral contour, and is a region where the negative electrode active material layer 22Y is provided as a whole. The negative electrode connection region a2 and the negative electrode effective region b2 are arranged in the 1 st direction d1 of the negative electrode plate 20Y. The negative electrode connection region a2 is closer to the outer side (the left side in fig. 3) of the negative electrode plate 20Y in the 1 st direction d1 than the negative electrode effective region b 2.
The plurality of negative electrode current collectors 21Y are joined to the negative electrode connecting region a2 by resistance welding, ultrasonic welding, tape bonding, welding, or the like, and are electrically connected. In this way, the negative electrode connecting region a2 of each negative electrode current collector 21Y constitutes the negative electrode connecting portion 23 (2 nd connecting portion). The negative electrode connection portion 23 includes: the 1 st surface 23a as the 1 st substrate 41 side surface; the 2 nd surface 23b as the 2 nd substrate 42 side surface. The 1 st surface 23a corresponds to the 1 st surface 21a in the negative electrode connection region a2 of the negative electrode current collector 21Y disposed closest to the 1 st substrate 41 side among the plurality of negative electrode current collectors 21Y. The 2 nd surface 13b corresponds to the 2 nd surface 21b in the negative electrode connecting region a2 of the negative electrode current collector 21Y disposed closest to the 2 nd substrate 42 side among the plurality of negative electrode current collectors 21Y. In the present embodiment, the negative electrode tab 26 (No. 2 tab) is electrically connected to the No. 2 surface 13 b.
On the other hand, as shown in fig. 3, when viewed in the stacking direction dL, negative electrode effective region b2 extends to include a region facing positive electrode active material layer 12X of positive electrode plate 10X. That is, when viewed in the stacking direction dL, the negative electrode effective region b2 covers the entire outer periphery and extends outward of the positive electrode active material layer 12X. Therefore, as described above, the size of the negative electrode effective area b2 of the negative electrode plate 20Y in the 1 st direction d1 is larger than the size of the positive electrode effective area b1 of the positive electrode plate 10X in the 1 st direction d 1. In addition, the size of the negative electrode plate 20Y in the 2 nd direction d2 is larger than the size of the positive electrode plate 10X in the 2 nd direction d 2.
As shown in fig. 4, at least one of positive electrode plate 10X and negative electrode plate 20Y may have functional layer 30A on a surface facing the other. Functional layer 30A has an insulating property and prevents short circuit between positive electrode plate 10X and negative electrode plate 20Y. In the illustrated example, the negative electrode plate 20Y has a functional layer 30A. The functional layer 30A is provided on the surface of the negative electrode active material layer 22Y on the positive electrode plate 10X side (the surface facing the positive electrode plate 10X). That is, the functional layer 30A is provided on the side of the positive electrode plate 10X facing the negative electrode active material layers 22Y. The surface of each anode active material layer 22Y is covered with the functional layer 30A. The surface of the negative electrode plate 20Y facing the positive electrode active material layer 12X of the positive electrode plate 10X in the stacking direction dL is formed of a functional layer 30A. The functional layer 30A may not be provided on the negative electrode active material layer 22Y constituting the outermost surfaces 5a, 5b of the membrane electrode assembly 5. Further, the positive electrode plate 10X may have the functional layer 30A covering each positive electrode active material layer 12X instead of or in addition to the functional layer 30A shown in fig. 4.
The functional layer 30A may have a higher porosity than the anode active material layer 22Y. In addition, the functional layer 30A may have excellent heat resistance. As a material of such a functional layer 30A, for example, an inorganic material can be used. The inorganic material can impart high porosity to the functional layer 30A and also impart excellent heat resistance, for example, heat resistance of 150 ℃. Examples of the inorganic material include: particulate materials such as alumina, silica, and titania. As a material of the functional layer 30A, for example, an organic material can be used. The organic material can impart high porosity to the functional layer 30A and also impart excellent adhesion, liquid retention, and impact resistance to the functional layer 30A. Examples of the organic material include: cellulose and its modified form, polyolefin, polyethylene terephthalate, polybutylene terephthalate, polypropylene, polyester, polyacrylonitrile, aromatic polyamide, polyamide imide, polyimide, polyurethane, polyurea, polyvinyl chloride, polyvinylidene fluoride, etc., in the form of fibers or particles. The functional layer 30A can be produced, for example, by: a composition obtained by dispersing and dissolving the particulate inorganic material and the resinous organic material in a solvent is applied to the negative electrode active material layer 22Y, dried, and cured.
(lug)
As shown in fig. 1 to 3, the positive electrode tab 16 is electrically connected to the positive electrode connection portion 13 of the membrane electrode assembly 5, and the negative electrode tab 26 is electrically connected to the negative electrode connection portion 23 of the membrane electrode assembly 5. In the illustrated example, the positive electrode tab 16 is attached to the 2 nd surface 13b of the positive electrode connection portion 13 of the membrane electrode assembly 5, and the negative electrode tab 26 is attached to the 2 nd surface 23b of the negative electrode connection portion 23 of the membrane electrode assembly 5. The tabs 16 and 26 are mounted by welding or the like. Thereby, positive electrode tab 16 is electrically connected to positive electrode collector 11X, and negative electrode tab 26 is electrically connected to negative electrode collector 21Y.
As shown in fig. 1 and 2, the tabs 16 and 26 extend from the inside of the exterior package 40 to the outside of the exterior package 40 through the sealing portion 46 in the 1 st direction d 1. The tabs 16 and 26 function as terminals in the stacked battery 1. The 1 st base material 41 and the respective tabs 16, 26 of the exterior package 40 are heat-sealed by the sealants 18, 28. Similarly, the No. 2 base material 42 of the exterior package 40 and the respective tabs 16, 26 are heat-sealed by the sealants 18, 28. This prevents a gap from being formed around each of the tabs 16 and 26 to allow the sealed space 45 to communicate with the outside of the exterior package 40.
The positive electrode tab 16 may be formed using aluminum or the like. The negative electrode tab 26 may be formed using nickel, nickel-plated copper, or the like. The sealants 18 and 28 are made of a material capable of welding the resin adhesive layer 40b of the exterior package 40 and the tabs 16 and 26. Examples of the material of the sealants 18 and 28 include polypropylene, modified polypropylene, low-density polyethylene, ionomer, ethylene-vinyl acetate copolymer, and the like.
(insulating sheet)
As shown in fig. 2, 3, 5, and 6, the insulating sheet 50 is wound around the membrane electrode assembly 5 when viewed in the 1 st direction d 1. In the present embodiment, one insulating sheet 50 is wound around the periphery of the membrane electrode assembly 5 by one turn. The insulating sheet 50 may be formed in a sheet shape, or may be formed in an elongated shape so as to have a longitudinal direction in the outer circumferential direction of the membrane electrode assembly 5 when viewed in the 1 st direction d 1. The dimension of the insulating sheet 50 in the short side direction (the 1 st direction d1) may be shorter than the dimension of the 1 st direction d1 of the anode active material layer 22Y provided on the anode current collector 21Y.
As shown in fig. 6, the insulating sheet 50 includes: the 1 st end 51 provided on one end side and the 2 nd end 52 provided on the other end side in the outer peripheral direction of the membrane electrode assembly 5 as viewed in the 1 st direction d 1. In the illustrated example, the 1 st end portion 51 and the 2 nd end portion 52 are located on one side (the left side in fig. 6) of the membrane electrode assembly 5 in the 2 nd direction d 2. The insulating sheet 50 extends counterclockwise in fig. 6 from the 1 st end portion 51 around the membrane electrode assembly 5, and extends to one side (the left side in fig. 6) of the membrane electrode assembly 5 in the 2 nd direction d 2.
The insulating sheet 50 is wound so as to press the membrane electrode assembly 5 in the stacking direction dL, and is in contact with the outermost surfaces 5a, 5b of the membrane electrode assembly 5 in the stacking direction dL. The insulating sheet 50 forms an overlapping portion 53 where the insulating sheets 5 overlap each other on one side (the left side in fig. 6) of the membrane electrode assembly 5 in the 2 nd direction d 2. In the overlapping portion 53, the insulating sheets 50 are joined to each other as described below.
The membrane electrode assembly 5 is firmly held around the insulating sheet 50 by the insulating sheet 50. Therefore, the insulating sheet 50 can prevent the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 from being positionally displaced from each other. In addition, in the use of the stacked cell 1, the membrane electrode assembly 5 may swell and increase in thickness due to an increase in internal temperature. The insulating sheet 50 may have elasticity in order to prevent the insulating sheet 50 from being broken due to an increase in thickness of the membrane electrode assembly 5. For example, the insulating sheet 50 may have an elongation of 2% or more and 200% or less. The elongation of the insulating sheet 50 can be measured by the method defined in JIS K7127.
In the present embodiment, as shown in fig. 6, the insulating sheet 50 includes: a base material layer 50a, and an adhesive layer 50b laminated on the base material layer 50a and provided on the membrane electrode assembly 5 side. The adhesive layer 50b has adhesive properties and is configured to be capable of adhering to the membrane electrode assembly 5 and the base material layer 50 a. Thus, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 in contact with the insulating sheet 50 are adhered to the adhesive layer 50b, and the insulating sheet 50 and the membrane electrode assembly 5 are joined. This enables the membrane electrode assembly 5 to be more firmly held. In the overlapping portion 53, the adhesive layer 50b on the 2 nd end portion 52 side is bonded to the base material layer 50a on the 1 st end portion 51 side, and the insulating sheets 50 are bonded to each other. This can prevent the insulating sheet 50 from being detached from the membrane electrode assembly 5.
The substrate layer 50a may have insulation properties, chemical resistance, heat resistance, and the like. As the material constituting the base layer 50a, for example, there can be used: polyethylene terephthalate, polyethylene, polypropylene, nylon, aromatic polyamide. The adhesive layer 50b may have, in addition to adhesiveness, insulation properties, chemical resistance, heat resistance, and the like. As a material constituting the adhesive layer 50b, for example, acrylic resin, rubber, or silicone resin can be used.
The thickness of the insulating sheet 50 is 50 μm or less, preferably 30 μm or less, and more preferably 20 μm or less. This can suppress an increase in thickness of the stacked battery 1 and a decrease in energy density. In addition, the insulating sheet 50 may have a thickness of 8 μm or more in order to have a strength capable of preventing breakage during mounting operation while ensuring insulation properties. In order to form the insulating sheet 50 having such a thickness, the thickness of the base layer 50a is, for example, 5 to 30 μm. The thickness of the adhesive layer 50b is, for example, 3 μm to 20 μm.
[ method for producing laminated Battery ]
Next, a method for manufacturing the stacked-layer battery 1 according to the present embodiment, which is configured as a lithium-ion secondary battery, will be described. A method for manufacturing a stacked battery described below includes: a membrane electrode assembly preparation step (1 st preparation step) of preparing the membrane electrode assembly 5; an outer package preparation step (2 nd preparation step) of preparing a1 st base material 41 and a2 nd base material 42; a tab mounting step of mounting tabs 16 and 26 on both end portions of the membrane electrode assembly 5; a winding step of winding the insulating sheet 50 around the membrane electrode assembly 5; and a sealing step of sealing the membrane electrode assembly 5 between the 1 st substrate 41 and the 2 nd substrate 42. Hereinafter, each step will be described.
(preparation of Membrane electrode Assembly)
In the membrane electrode assembly preparation step, the membrane electrode assembly 5 is prepared. The membrane electrode assembly preparation step includes: a step of preparing a positive electrode plate 10X and a negative electrode plate 20Y; a step of alternately laminating positive electrode plates 10X and negative electrode plates 20Y; and a step of joining the positive electrode current collector 11X and the negative electrode current collector 21Y, respectively.
First, a process of preparing each of positive electrode plate 10X and negative electrode plate 20Y will be described. First, a composition (slurry) for forming the positive electrode active material layer 12X is applied to a long aluminum foil for forming the positive electrode current collector 11X and cured. Next, cut to a desired size, a single sheet-shaped positive electrode plate 10X may be prepared. Similarly, a composition (slurry) for forming the negative electrode active material layer 22Y is applied to a long copper foil for forming the negative electrode current collector 21Y and cured. Next, cut to a desired size, negative electrode plate 20Y in a single sheet shape can be produced. When the functional layer 30A is provided on at least one of the positive electrode plate 10X and the negative electrode plate 20Y, the functional layer 30A can be prepared by, for example, applying a composition in which a particulate inorganic material and a resinous organic material are dispersed and dissolved in a solvent to a long material before cutting or a single material after cutting to form the electrode plates 10X and 20Y, drying and curing the composition.
Next, a step of alternately stacking positive electrode plates 10X and negative electrode plates 20Y is performed. In this step, positive electrode plate 10X and negative electrode plate 20Y are stacked such that positive electrode active material layer 12X of positive electrode plate 10X and negative electrode active material layer 22Y of negative electrode plate 20Y face each other. Negative electrode plate 20Y is disposed at the lowermost portion and the uppermost portion in the stacking direction dL.
Next, a step of joining the positive electrode current collector 11X and the negative electrode current collector 21Y is performed. In this step, the positive electrode current collectors 11X of the stacked positive electrode plates 10X are collected in the positive electrode connection region a1, and joined by ultrasonic welding or the like. Thereby, the plurality of positive electrode connection regions a1 form the positive electrode connection parts 13 which are stacked in the stacking direction d L and electrically connected to each other. Similarly, the negative electrode current collector 21Y of the stacked negative electrode plate 20Y is collected in the negative electrode connecting region a2, and joined by ultrasonic welding or the like. Thereby, the plurality of negative electrode connection regions a2 form the negative electrode connection portion 23 that are stacked in the stacking direction dL and electrically connected to each other.
This makes it possible to obtain a membrane electrode assembly 5 in which positive electrode plates 10X and negative electrode plates 20Y are alternately stacked.
(exterior package preparation Process)
In the outer package preparation step, the 1 st substrate 41 and the 2 nd substrate 42 are prepared. The exterior package preparation step includes: a step of preparing a1 st substrate 41; and a step of preparing the 2 nd substrate 42.
In the step of preparing the 1 st substrate 41, first, a composition of a resin material for forming the resin adhesive layer 40b is applied to one side of the aluminum foil forming the metal layer 40a and cured. Next, the first substrate 41 is cut into a desired size to obtain a flat plate-like 1 st substrate. Then, the flat-plate-like 1 st base material 41 is subjected to spinning to form the bulging portion 44. Thus, the 1 st base material 41 having the swelling portion 44 swelling from the peripheral portion 43 can be prepared (see fig. 5).
In the step of preparing the 2 nd substrate 42, first, a composition of a resin material for forming the resin adhesive layer 40b is applied to one side of the aluminum foil forming the metal layer 40a and cured. Next, the substrate is cut into a desired size to obtain a2 nd base material 42 in a flat plate shape (see fig. 5).
This makes it possible to obtain the 1 st substrate 41 and the 2 nd substrate 42 constituting the exterior package 40 of the sealing film electrode assembly 5.
(working procedure for mounting lug)
After the membrane electrode assembly preparation step and the exterior package preparation step, a tab mounting step is performed. In the tab mounting step, the pair of tabs 16 and 26 are mounted on both end portions of the membrane electrode assembly 5. The lug plate mounting process comprises the following steps: preparing the lugs 16 and 26; and a step of mounting the tabs 16 and 26 on the membrane electrode assembly 5.
First, a step of preparing the tabs 16 and 26 is performed. In this step, a positive electrode tab 16 made of aluminum metal is prepared, and a positive electrode sealing agent 18 is attached to the positive electrode tab 16. The positive electrode sealant 18 is attached so as to cover a part of the positive electrode tab 16 in the 1 st direction d1, and is attached so as to extend out of both sides of the positive electrode tab 16 in the 2 nd direction d 2. Further, a negative electrode tab 26 formed of copper metal is prepared, and a negative electrode sealing agent 28 is attached to the negative electrode tab 26. The negative electrode sealant 28 is attached so as to cover a part of the negative electrode tab 26 in the 1 st direction d1, and is attached so as to extend out of both sides of the negative electrode tab 26 in the 2 nd direction d 2.
Next, a step of mounting the tabs 16 and 26 on the membrane electrode assembly 5 is performed. In this step, the prepared tabs 16 and 26 are attached to the connecting portions 13 and 23 provided at both ends of the membrane electrode assembly 5 in the 1 st direction d1, respectively. More specifically, first, the positive electrode tab 16 is placed on the step. Next, the membrane electrode assembly 5 is placed so that the upper surface of the positive electrode tab 16 and the 2 nd surface 13b of the positive electrode connecting portion 13 of the membrane electrode assembly 5 partially overlap. At this time, the alignment of the membrane electrode assembly 5 with respect to the positive electrode tab 16 is performed so that the center position of the positive electrode connection region a1 in the 2 nd direction d2 coincides with the center position of the positive electrode tab 16. Then, the positive electrode tab 16 is welded to the positive electrode connection portion 13 of the membrane electrode assembly 5 by resistance welding, ultrasonic welding, or the like. This allows the positive electrode tab 16 to be electrically connected to the positive electrode connecting portion 13 of the membrane electrode assembly 5. Similarly, the prepared negative electrode tab 26 can be electrically connected to the negative electrode connecting portion 23 of the membrane electrode assembly 5.
This makes it possible to obtain the membrane electrode assembly 5 with the tabs 16 and 26 mounted thereon.
(winding step)
After the tab mounting step, a winding step is performed. In the winding step, the insulating sheet 50 is wound around the membrane electrode assembly 5. The winding step includes: preparing an insulating sheet 50; and a step of winding the insulating sheet 50 around the membrane electrode assembly 5.
In the step of preparing the insulating sheet 50, the insulating sheet 50 is prepared by laminating the adhesive layer 50b on the base material layer 50 a. The insulating sheet 50 may be prepared so that the dimension in the short side direction is shorter than the dimension of the negative electrode active material layer 22Y in the 1 st direction d1, and the dimension in the long side direction is longer than the circumference of the membrane electrode assembly 5 when viewed in the 1 st direction d 1.
Next, a step of winding the insulating sheet 50 around the membrane electrode assembly 5 is performed. In this step, the prepared insulating sheet 50 is wound around the membrane electrode assembly 5 when viewed in the 1 st direction d 1. More specifically, first, the 1 st end portion 51 of the insulating sheet 50 provided on one end side is disposed on one side (the left side in fig. 6) in the 2 nd direction d2 of the membrane electrode assembly 5. At this time, the adhesive layer 50b of the insulating sheet 50 is disposed on the membrane electrode assembly 5 side. Next, the insulating sheet 50 is wound around the membrane electrode assembly 5 so that the 2 nd end portion 52 and the 1 st end portion 51 of the insulating sheet 50, which are provided on the other end side, overlap each other. Thus, the overlapping portion 53 in which the insulating sheets 5 overlap each other is formed on one side (the left side in fig. 6) of the membrane electrode assembly 5 in the 2 nd direction d 2. In the overlapping portion 53, the base material layer 50a on the 1 st end portion 51 side and the adhesive layer 50b on the 2 nd end portion 52 side are bonded. When the insulating sheet 50 is wound, the adhesive layer 50b of the insulating sheet 50 comes into contact with the outermost surfaces 5a and 5b of the membrane electrode assembly 5, and the outermost surfaces 5a and 5b of the membrane electrode assembly 5 adhere to the adhesive layer 50b of the insulating sheet 50. Further, when the insulating sheet 50 is wound, tension is applied to the insulating sheet 50. Thereby, the insulating sheet 50 is wound around the membrane electrode assembly 5 so as to press the membrane electrode assembly 5 in the stacking direction dL.
This makes it possible to obtain the membrane electrode assembly 5 in which the insulating sheet 50 is wound as shown in fig. 6.
(sealing Process)
After the winding process, a sealing process is performed. In the sealing step, the membrane electrode assembly 5 is sealed in the outer package 40.
In this sealing step, first, the 2 nd base material 42 is placed on the step so that the resin adhesive layer 40b faces upward. Next, the membrane electrode assembly 5 is placed on the 2 nd substrate 42. Next, the 1 st substrate 41 is covered from above the membrane electrode assembly 5 so that the membrane electrode assembly 5 is accommodated in the bulging portion 44. The 1 st base 41 is covered so that the resin adhesive layer 40b of the 1 st base 41 faces the resin adhesive layer 40b of the 2 nd base 42. At this time, the membrane electrode assembly 5 is disposed between the bulging portion 44 of the 1 st substrate 41 and the 2 nd substrate 42 in a state where the tabs 16, 26 are extended to the outside. Next, the 1 st substrate 41 and the 2 nd substrate 42 are pressed against the periphery of the membrane electrode assembly 5 by, for example, a metal heating rod having a temperature of 150 to 200 ℃. In the vicinity of the region pressed by the heating bar, the resin adhesive layers 40b formed on the inner surfaces of the 1 st base material 41 and the 2 nd base material 42 are thereby dissolved, and they are heat-sealed (heat-welded) to form the seal portion 46. The 1 st substrate 41 and the 2 nd substrate 42 may be integrally formed as a continuous body. In this case, the 1 st substrate 41 can be covered on the membrane electrode assembly 5 mounted on the 2 nd substrate 42 by bending the portion between the 1 st substrate 41 and the 2 nd substrate 42. The seal portion 46 may not be formed at the bent portion, and the portion may be disposed on one side in the 2 nd direction d 2.
In the sealing portion 46, the sealants 18 and 28 are interposed between the exterior package 40 and the tabs 16 and 26. During heat sealing, the resin adhesive layer 40b of the 1 st substrate 41, the resin adhesive layer 40b of the 2 nd substrate 42, and the sealants 18 and 28 are dissolved, respectively. Therefore, the 1 st substrate 41 and the tabs 16, 26 are heat sealed while the 2 nd substrate 42 and the tabs 16, 26 are heat sealed. This prevents a gap from being formed around the tabs 16 and 26 to allow the sealed space 45 to communicate with the outside of the exterior package 40. The heat-sealing step is performed in a decompression chamber, and the sealed space 45 after heat-sealing is decompressed.
As shown in fig. 1, a stacked cell 1 in which the membrane electrode assembly 5 is sealed in the exterior package 40 can be obtained.
In the present embodiment, the insulating sheet 50 is wound around the membrane electrode assembly 5 when viewed in the 1 st direction d 1. This enables the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 to be firmly held. Therefore, even when the stacked battery 1 receives an external force, the internal positive electrode plate 10X and the internal negative electrode plate 20Y can be prevented from being displaced from each other.
Further, since the laminated film type exterior package having the metal layer 40a and the resin adhesive layer 40b is used as the exterior package 40, the exterior package 40 is deformed by a force from the outside. For example, when the outer package 40 is deformed into a concave shape by an external force, the gap between the positive electrode plate 10X and the negative electrode plate 20Y may be widened in the peripheral region of the concave deformed portion. Since the electrode plates 10X and 20Y are sheet-shaped, such an increase in the interval between the electrode plates 10X and 20Y may occur more significantly. When the distance between the electrode plates 10X and 20Y is increased, air bubbles are present between the electrode plates 10X and 20Y, and the air bubbles may partially block the movement of lithium ions. As a result, the output current of the stacked cell 1 may not be uniform, and the performance of the stacked cell 1 may be degraded. In contrast, according to the present embodiment, the insulating sheet 50 is wound around the membrane electrode assembly 5 when viewed in the 1 st direction d 1. This prevents the gap between positive electrode plate 10X and negative electrode plate 20Y from being widened even when external force is applied to outer package 40, and thus, battery performance of stacked battery 1 can be prevented from being degraded.
In addition, according to the present embodiment, the overlapping portion 53 is formed by overlapping the insulating sheets 50, and the insulating sheets 50 are joined to each other at the overlapping portion 53. This can prevent the insulating sheet 50 from being detached from the membrane electrode assembly 5. Therefore, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be more firmly held. As a result, the internal positive electrode plate 10X and negative electrode plate 20Y can be effectively prevented from being positionally displaced from each other.
In addition, according to the present embodiment, the 1 st end portion 51 and the 2 nd end portion 52 of the insulating sheet 50 are arranged on the membrane electrode assembly 5 side in the 2 nd direction d 2. This prevents the occurrence of a step difference between the 1 st end portion 51 and the 2 nd end portion 52 on one side or the other side of the membrane electrode assembly 5 in the stacking direction dL. Therefore, an increase in the height of the sealed space 45 in the stacking direction dL in the exterior package 40 can be suppressed. As a result, an increase in the volume of the sealed space 45 can be suppressed, and a decrease in the energy density of the stacked battery 1 can be suppressed.
In addition, according to the present embodiment, the insulating sheet 50 has the adhesive layer 50b provided on the membrane electrode assembly 5 side. Thereby, the insulating sheet 50 can be bonded to the outermost surfaces 5a, 5b of the membrane electrode assembly 5 in the stacking direction dL. This enables the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 to be more firmly held. As a result, the internal positive electrode plate 10X and negative electrode plate 20Y can be effectively prevented from being positionally displaced from each other.
In addition, according to the present embodiment, the winding step of winding the insulating sheet 50 around the membrane electrode assembly 5 is performed after the tab mounting step of mounting the tabs 16 and 26 on the membrane electrode assembly 5. This enables the preparation of the membrane electrode assembly 5 and the mounting of the tabs 16, 26 to the membrane electrode assembly 5 to be performed through a continuous series of steps. For example, in the case where the tabs 16 and 26 are mounted without moving the membrane electrode assembly 5 after the membrane electrode assembly 5 is prepared, the continuity of the process can be maintained, and the decrease in the operation efficiency can be suppressed.
In the foregoing, one embodiment is described while referring to specific examples, but the specific examples are not intended to be limited to one embodiment. The above-described embodiment can be implemented by other various specific examples, and various omissions, substitutions, and changes can be made without departing from the spirit thereof.
Hereinafter, an example of the modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for corresponding portions in the above-described specific example are used for portions that can be configured in the same manner as in the above-described specific example, and the repetitive description thereof is omitted.
(modification 1)
In the embodiment, there is shown: an example in which one insulating sheet 50 is wound around the membrane electrode assembly 5. However, the present invention is not limited to this, and two or more insulating sheets 50 may be wound around the membrane electrode assembly 5.
In the example shown in fig. 7, two insulating sheets 50 are wound around the membrane electrode assembly 5 when viewed in the 1 st direction d 1. The two insulation sheets 50 are arranged to be aligned and separated in the 1 st direction d 1.
Even in such a case, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be firmly held.
(modification 2)
In the embodiment, there is shown: an example in which the insulating sheet 50 is wound around the periphery of the membrane electrode assembly 5 by one turn. However, the insulating sheet 50 may be wound around the membrane electrode assembly 5 for two or more weeks without being limited thereto. That is, the insulating sheet 50 having a longitudinal dimension 2 times or more the circumferential length of the membrane electrode assembly 5 as viewed in the 1 st direction d1 may be prepared, and the insulating sheet 50 may be wound around the membrane electrode assembly 5 for two or more weeks.
By winding the insulating sheet 50 around the membrane electrode assembly 5 for two or more weeks in this manner, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be further firmly held.
(modification 3)
In the embodiment, there is shown: the winding step of winding the insulating sheet 50 around the membrane electrode assembly 5 is performed after the tab mounting step of mounting the tabs 16 and 26 on the membrane electrode assembly 5. However, without being limited thereto, the winding process may be performed before the tab mounting process.
When the tabs 16 and 26 are attached to the membrane electrode assembly 5, the membrane electrode assembly 5 may be moved in order to attach the tabs 16 and 26. It is considered that the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 are displaced from each other by this movement. According to this modification, before the tabs 16 and 26 are attached to the membrane electrode assembly 5, the insulating sheet 50 is wound around the membrane electrode assembly 5. Thus, even when the tabs 16 and 26 are attached, the insulating sheet 50 can prevent the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly from being positionally displaced from each other.
(modification 4)
In the embodiment, there is shown: the insulating sheet 50 has an example of an adhesive layer 50b provided on the membrane electrode assembly 5 side. However, without being limited thereto, the insulating sheet 50 may not have the adhesive layer 50 b. In this case, the outermost surfaces 5a, 5b of the membrane electrode assembly may not be bonded by the insulating sheet 50.
Even in such a case, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be firmly held by winding the insulating sheet 50 around the membrane electrode assembly 5.
(modification 5)
In the embodiment, there is shown: the insulating sheet 50 has an example of an adhesive layer 50b provided on the membrane electrode assembly 5 side. However, not limited to this, as shown in fig. 8, the insulating sheet 50 may have a fusion-bonding layer 50c that can be welded to the outermost surfaces 5a, 5b of the membrane electrode assembly 5, instead of the adhesive layer 50 b.
For example, in the production of the stacked cell 1, a thermal welding step (welding step) of thermally welding (welding) the insulating sheet 50 to the membrane electrode assembly 5 may be provided after the winding step of winding the insulating sheet 50 around the membrane electrode assembly 5. In this thermal fusion bonding step, the upper surface (outermost surface 5a) and the lower surface (outermost surface 5b) of the membrane electrode assembly 5 around which the insulating sheet 50 is wound are sandwiched between the insulating sheet 50 and a metal heating rod having a temperature of, for example, 80 to 120 ℃, and pressed at a pressure of, for example, 0.1 to 50 MPa. Thereby, in the region pressed by the heating rod and the vicinity thereof, the fusion-bonded layer 50c of the insulating sheet 50 is dissolved and fused to the outermost surfaces 5a, 5b of the membrane electrode assembly 5. Thereby, the insulating sheet 50 can be bonded to the membrane electrode assembly 5. By setting the temperature at the time of welding to 120 ℃ or lower, the negative electrode active material layer 22Y can be prevented from deteriorating, and the reliability of the stacked battery 1 can be ensured. As a material constituting the fusion-coating layer 50c, for example, olefin resin, ethylene-vinyl acetate copolymer (EVA), polyethylene oxide (PEO) can be used. The base layer 50a may be made of a material that does not dissolve when the fusion-bonding layer 50c is fused. As such a material, for example, polyethylene terephthalate can be used.
By welding the insulating sheet 50 to the membrane electrode assembly 5 in this manner, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be more firmly held.
(modification 6)
In the embodiment, there is shown: the insulating sheet 50 has an example of an adhesive layer 50b provided on the membrane electrode assembly 5 side. However, without being limited thereto, as shown in fig. 8, the insulating sheet 50 may have, instead of the adhesive layer 50 b: the bonding layer 50d provided on the membrane electrode assembly 5 side is a bonding layer 50d formed of a bonding material containing the same material as the material constituting the binder contained in the anode active material layer 22Y. That is, in the case where styrene butadiene rubber is used as the binder of the anode active material layer 22Y, the insulating sheet 50 may have the bonding layer 50d formed of styrene butadiene rubber.
As described above, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 are each composed of the anode active material layer 22Y. The negative electrode active material layer 22Y constituting the outermost surfaces 5a and 5b of the membrane electrode assembly 5 functions as a layer to be bonded to the bonding layer 50d of the insulating sheet 50. As described above, in the winding step, the insulating sheet 50 is in contact with the outermost surfaces 5a and 5b of the membrane electrode assembly 5. When the bonding layer 50d of the insulating sheet 50 is in contact with the outermost surfaces 5a, 5b of the membrane electrode assembly 5, the bonding material of the bonding layer 50d enters the irregularities of the negative electrode active material layer 22Y constituting the outermost surfaces 5a, 5b of the membrane electrode assembly 5 and wets and diffuses, and intermolecular forces such as hydrogen bond-dipole interaction-van der waals force are generated between the bonding material of the bonding layer 50d and the material constituting the binder contained in the negative electrode active material layer 22Y. In particular, in the case where the material of the binder of the anode active material layer 22Y contains the same material as the bonding material of the bonding layer 50d, the intermolecular force acting between the two may be further enhanced. As such a material, a material having adhesiveness can be used. In the present embodiment, styrene butadiene rubber is used as the material of the bonding layer 50d and the material of the binder of the negative electrode active material layer 22Y. The styrene butadiene rubber has adhesiveness and, at the same time, the styrene butadiene rubbers are liable to wet and spread each other when they are brought into contact with each other. Therefore, when the insulating sheet 50 is wound around the membrane electrode assembly 5, the bonding material of the bonding layer 50d and the binder of the anode active material layer 22Y are wetted and diffused with each other, van der waals force is generated between the two, and the insulating sheet 50 and the membrane electrode assembly 5 are bonded and bonded to each other.
As described above, according to this modification, the insulating sheet 50 has the bonding layer 50d provided on the membrane electrode assembly 5 side, and the bonding material constituting the bonding layer 50d includes the same material as the material constituting the binder included in the negative electrode active material layer 22Y of the negative electrode plate 20Y. This enables the insulating sheet 50 and the membrane electrode assembly 5 to be firmly bonded to each other. Therefore, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be more firmly held.
(modification 7)
The 6 th modification example shows: examples of the outermost surfaces 5a, 5b of the membrane electrode assembly 5 include the anode active material layer 22Y. However, without being limited thereto, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 may not be constituted by the anode active material layer 22Y. That is, the negative electrode active material layer 22Y may not be provided on the 1 st surface 21a of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 1 st substrate 41 side and the 2 nd surface 21b of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 2 nd substrate 42 side.
In this case, as shown in fig. 9, a binder layer 31 made of a binder may be provided on the 1 st surface 21a of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 1 st substrate 41 side and the 2 nd surface 21b of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 2 nd substrate 42 side. That is, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 may be constituted by the adhesive layer 31. Further, instead of the bonding layer 50d, the insulating sheet 50 may have: the bonding layer 50e provided on the membrane electrode assembly 5 side is a bonding layer 50e formed of a bonding material containing the same material as the material constituting the adhesive contained in the adhesive layer 31.
The adhesive layer 31 may be formed by: in the membrane electrode assembly preparation step, a binder dispersed and dissolved in a solvent is applied to the 1 st surface 21a of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 1 st substrate 41 and the 2 nd surface 21b of the negative electrode collector 21Y of the negative electrode plate 20Y disposed closest to the 2 nd substrate 42, and the binder is dried and cured. The adhesive layer 31 functions as a layer to be bonded to the bonding layer 50e of the insulating sheet 50. As the binder included in the binder layer 31, the same materials as those included in the positive electrode active material layer 12X and the negative electrode active material layer 22Y and constituting the binder, such as polyvinylidene fluoride and styrene butadiene rubber, can be used. As the bonding material included in the bonding layer 50e, the same material as the material constituting the adhesive can be used.
As described above, according to the present modification, in the case where the outermost surfaces 5a, 5b of the membrane electrode assembly 5 are not constituted by the negative electrode active material layer 22Y, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 are constituted by the binder layer 31 constituted by the binder, and the bonding layer 50e of the insulating sheet 50 is formed by the bonding material containing the same material as the material constituting the binder contained in the binder layer 31. Thereby, even when the outermost surfaces 5a, 5b of the membrane electrode assembly 5 are not constituted by the anode active material layer 22Y, the insulating sheet 50 and the membrane electrode assembly 5 can be firmly bonded to each other. Therefore, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be more firmly held.
(modification 8)
In the embodiment, there is shown: the insulating sheet 50 has an example of an adhesive layer 50b provided on the membrane electrode assembly 5 side. However, without being limited thereto, as shown in fig. 8, the insulating sheet 50 may have, instead of the adhesive layer 50 b: the bonding layer 50f provided on the membrane electrode assembly 5 side is a bonding layer 50f formed of a bonding material containing a resin material having a polar group. Examples of the polar group include: a material containing a C ═ O bond such as a carbonyl group, a carboxyl group, an ester group, a carbonate bond, a urethane bond, or a urea bond, a material containing an O — H bond such as a carboxyl group, a phenolic hydroxyl group, an alcoholic hydroxyl group, or a silanol group, a material containing a C — F bond, a material containing a C — O bond, or a material containing a C — N bond. As such a resin material having a polar group, for example, there can be used: polyvinyl alcohol, polyvinyl alcohol-polyvinyl acetate copolymer, and the like.
As described above, the outermost surfaces 5a, 5b of the membrane electrode assembly 5 are each composed of the anode active material layer 22Y. The negative electrode active material layer 22Y constituting the outermost surfaces 5a and 5b of the membrane electrode assembly 5 functions as a layer to be bonded to the bonding layer 50f of the insulating sheet 50. As described above, in the winding step, the insulating sheet 50 is brought into contact with the outermost surfaces 5a and 5b of the membrane electrode assembly 5. The insulating sheet 50 is in contact with the outermost surfaces 5a and 5b of the membrane electrode assembly 5, and when heated as necessary, ionic bonds, coulomb forces, covalent bonds, hydrogen bonds, and the like are generated between the bonding layer 50f containing a resin material having a polar group and the negative electrode active material layer 22Y containing a binder. Therefore, when the insulating sheet 50 is wound around the membrane electrode assembly 5, the insulating sheet 50 and the membrane electrode assembly 5 are bonded to each other.
As described above, according to this modification, the insulating sheet 50 has the bonding layer 50f provided on the membrane electrode assembly 5 side, and the bonding material constituting the bonding layer 50f contains a resin material having a polar group. This enables the insulating sheet 50 and the membrane electrode assembly 5 to be firmly bonded to each other. Therefore, the positive electrode plate 10X and the negative electrode plate 20Y of the membrane electrode assembly 5 can be more firmly held.
(modification 9)
In the embodiment, there is shown: at least one of the positive electrode plate 10X and the negative electrode plate 20Y has an example of the functional layer 30A. However, as shown in fig. 10, in addition to or instead of the point that at least one of positive electrode plate 10X and negative electrode plate 20Y includes functional layer 30A, insulating sheet 60 configured as a member separate from positive electrode plate 10X and negative electrode plate 20Y may be disposed between positive electrode plate 10X and negative electrode plate 20Y. In this case, the insulating sheet 60 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y, and functions as a separator. In the example shown in fig. 10, the insulating sheet 60 is disposed between the functional layer 30A of the positive electrode plate 10X and the negative electrode active material layer 22Y of the negative electrode plate 20Y. The insulating sheet 60 may be formed of, for example, a nonwoven fabric or a porous material. In this example, the electrolyte or the gel-like electrolyte contained in the external packaging body 40 is impregnated into and held by the insulating sheet 60. The insulating sheet 60 used in this example is not particularly limited, and various insulators applicable to the stacked battery 1, particularly a lithium ion secondary battery, can be used.
In the present modification, the insulating sheet 60 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y, whereby the short circuit between the positive electrode plate 10X and the negative electrode plate 20Y can be further prevented.
Although several modifications of the above embodiment have been described, it is needless to say that a plurality of modifications may be appropriately combined at least partially and applied.
Claims (20)
1. A stacked battery includes:
an exterior package having:
a1 st substrate and a2 nd substrate each comprising a metal layer and a resin adhesive layer provided on an inner surface of the metal layer, and
a sealing portion that welds the resin adhesive layer of the 1 st base material and the resin adhesive layer of the 2 nd base material and forms a sealed space between the 1 st base material and the 2 nd base material;
a membrane electrode assembly that is disposed in the sealed space and has a plurality of 1 st electrode plates and a plurality of 2 nd electrode plates alternately stacked in a stacking direction;
a pair of tabs provided at both end portions of the membrane electrode assembly in the 1 st direction; and
an insulating sheet wound around the membrane electrode assembly when viewed in the 1 st direction.
2. The stacked type battery according to claim 1,
the insulating sheet has: a1 st end portion provided at one end side in an outer peripheral direction of the membrane electrode assembly and a2 nd end portion provided at the other end side as viewed in the 1 st direction,
the insulating sheet is wound around the membrane electrode assembly from the 1 st end portion and extends beyond the 1 st end portion to form an overlapping portion in which the insulating sheets are overlapped with each other,
the insulating sheets are joined to each other at the overlapping portion.
3. The stacked type battery according to claim 2,
the 1 st end portion and the 2 nd end portion are arranged on one side of the membrane electrode assembly in a2 nd direction perpendicular to the stacking direction when viewed in the 1 st direction.
4. A stacked-type battery according to any one of claims 1 to 3,
the insulating sheet has an adhesive layer provided on the membrane electrode assembly side.
5. A stacked-type battery according to any one of claims 1 to 3,
the insulating sheet is welded to the membrane electrode assembly.
6. A stacked-type battery according to any one of claims 1 to 3,
the outermost surface in the stacking direction of the membrane electrode assembly is composed of a layer to be joined containing an adhesive,
the insulating sheet has a bonding layer provided on the membrane electrode bonding body side,
the bonding layer and the bonded layer are bonded to each other.
7. A stacked-type battery according to claim 6,
the bonding layer is formed of a bonding material,
the bonding material contains the same material as the material constituting the adhesive.
8. A stacked-type battery according to claim 7,
the 2 nd electrode plate includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is formed of the electrode active material layer.
9. A stacked-type battery according to claim 6,
the 2 nd electrode plate includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is composed of the electrode active material layer,
the bonding layer is formed of a bonding material,
the bonding material includes a resin material having a polar group.
10. A method for manufacturing a stacked battery, comprising:
a1 st preparation step of preparing a membrane electrode assembly having a plurality of 1 st electrode plates and a plurality of 2 nd electrode plates alternately stacked in a stacking direction;
a2 nd preparation step of preparing a1 st base material and a2 nd base material each including a metal layer and a resin adhesion layer provided on one side of the metal layer;
a tab mounting step of mounting a pair of tabs at both end portions of the membrane electrode assembly in a1 st direction;
a winding step of winding an insulating sheet around the membrane electrode assembly when viewed in the 1 st direction; and
and a sealing step of, after the winding step, disposing the membrane electrode assembly between the 1 st base material and the 2 nd base material, welding the resin adhesive layer of the 1 st base material and the resin adhesive layer of the 2 nd base material, and sealing the membrane electrode assembly between the 1 st base material and the 2 nd base material.
11. The manufacturing method of a stacked type battery according to claim 10,
the insulating sheet has: a1 st end portion provided at one end side in an outer peripheral direction of the membrane electrode assembly and a2 nd end portion provided at the other end side as viewed in the 1 st direction,
in the winding step, the insulating sheets are wound around the membrane electrode assembly from the 1 st end portion and extended beyond the 1 st end portion, and an overlapping portion is formed by overlapping the insulating sheets, and the insulating sheets are joined to each other at the overlapping portion.
12. The manufacturing method of a stacked type battery according to claim 11,
in the winding step, the 1 st end portion and the 2 nd end portion are arranged on one side of the membrane electrode assembly in a2 nd direction perpendicular to the stacking direction when viewed in the 1 st direction.
13. The method for manufacturing a stacked-type battery according to any one of claims 10 to 12,
the winding process is performed after the tab mounting process.
14. The method for manufacturing a stacked-type battery according to any one of claims 10 to 12,
the winding process is performed before the tab mounting process.
15. The method for manufacturing a stacked-type battery according to any one of claims 10 to 14, wherein,
the insulating sheet has an adhesive layer provided on the membrane electrode assembly side,
in the rolling step, the outermost surface of the membrane electrode assembly in the stacking direction is bonded to the adhesive layer.
16. The method for manufacturing a stacked-type battery according to any one of claims 10 to 14, further comprising, after the winding step:
and a welding step of welding the insulating sheet to the membrane electrode assembly.
17. The method for manufacturing a stacked-type battery according to any one of claims 10 to 14, wherein,
the outermost surface of the membrane electrode assembly prepared in the 1 st preparation step in the stacking direction is formed of a layer to be joined including an adhesive,
the insulating sheet has a bonding layer provided on the membrane electrode bonding body side,
in the winding step, the joining layer and the joined layer are joined to each other.
18. The manufacturing method of a stacked-type battery according to claim 17, wherein,
the bonding layer is formed of a bonding material,
the bonding material contains the same material as the material constituting the adhesive.
19. The manufacturing method of a stacked-type battery according to claim 18,
the 2 nd electrode plate prepared in the 1 st preparation step includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is formed of the electrode active material layer.
20. The manufacturing method of a stacked-type battery according to claim 17, wherein,
the 2 nd electrode plate prepared in the 1 st preparation step includes an electrode collector and an electrode active material layer provided on the electrode collector,
the joined layer is composed of the electrode active material layer,
the bonding layer is formed of a bonding material,
the bonding material includes a resin material having a polar group.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019177293A JP6889222B2 (en) | 2019-09-27 | 2019-09-27 | Laminated battery and manufacturing method of laminated battery |
| JP2019-177293 | 2019-09-27 | ||
| PCT/JP2020/036113 WO2021060401A1 (en) | 2019-09-27 | 2020-09-24 | Stacked battery and method for producing stacked battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113994520A true CN113994520A (en) | 2022-01-28 |
Family
ID=75166188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080043216.XA Pending CN113994520A (en) | 2019-09-27 | 2020-09-24 | Stacked battery and method for manufacturing stacked battery |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6889222B2 (en) |
| CN (1) | CN113994520A (en) |
| WO (1) | WO2021060401A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000311717A (en) * | 1999-02-25 | 2000-11-07 | Mitsubishi Chemicals Corp | Battery element and battery |
| JP4951168B2 (en) * | 2000-12-25 | 2012-06-13 | トータル ワイヤレス ソリューショオンズ リミテッド | Sheet-like lithium secondary battery |
| JP2014071985A (en) * | 2012-09-28 | 2014-04-21 | Shin Kobe Electric Mach Co Ltd | Lithium ion battery |
| EP3018750B1 (en) * | 2013-07-05 | 2018-12-19 | NEC Energy Devices, Ltd. | Battery cell |
| JP6245142B2 (en) * | 2014-10-30 | 2017-12-13 | トヨタ自動車株式会社 | Secondary battery manufacturing method and secondary battery |
-
2019
- 2019-09-27 JP JP2019177293A patent/JP6889222B2/en active Active
-
2020
- 2020-09-24 WO PCT/JP2020/036113 patent/WO2021060401A1/en active Application Filing
- 2020-09-24 CN CN202080043216.XA patent/CN113994520A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021060401A1 (en) | 2021-04-01 |
| JP2021057140A (en) | 2021-04-08 |
| JP6889222B2 (en) | 2021-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2500972B1 (en) | Lithium secondary battery having multi-directional lead-tab structure | |
| JP5017843B2 (en) | Battery module and battery pack | |
| JP5028812B2 (en) | Battery module | |
| JP5070703B2 (en) | Bipolar battery | |
| KR102401809B1 (en) | Method for manufacturing an electrode unit for a battery cell, and an electrode unit | |
| KR20080094821A (en) | Cell module, battery pack and vehicle with such batteries mounted thereon | |
| KR20130131247A (en) | Fabricating method of electrode assembly and electrochemical cell containing the electrode assembly | |
| JP2017069207A (en) | Lithium ion secondary battery and manufacturing method for the same | |
| KR101108447B1 (en) | Process for Preparation of Pouch-typed Secondary Battery Having Excellent Sealing Property | |
| KR100910624B1 (en) | Double-Typed Secondary Battery | |
| KR101387137B1 (en) | Electrode assembly and rechargeable battery with the same | |
| JP2020030899A (en) | Secondary battery | |
| CN113966559A (en) | Stacked battery and method for transporting stacked battery | |
| CN113994520A (en) | Stacked battery and method for manufacturing stacked battery | |
| JP4078489B2 (en) | Battery manufacturing method | |
| JP7201482B2 (en) | Storage element and method for manufacturing storage element | |
| CN113950766A (en) | Laminated battery | |
| CN114391193A (en) | Laminated battery and method for manufacturing laminated battery | |
| JP2020170636A (en) | Laminated battery | |
| JP6846490B1 (en) | Power storage element and manufacturing method of power storage element | |
| JP2019220333A (en) | Stacked battery and method for manufacturing stacked battery | |
| JP2020144998A (en) | Power storage element | |
| JP7193363B2 (en) | Storage element, method for manufacturing storage element | |
| JP7172904B2 (en) | Storage module and method for manufacturing storage module | |
| JP2020140833A (en) | Lamination type battery and method of manufacturing lamination type battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |