# US 2023/0411751 A1 · Electricity Storage Body

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- Number: US 2023/0411751 A1
- Document ID: US20230411751A1
- Status: Published application
- Kind: A1
- Application number: 18/191,996
- Filed: 2023-03-29
- Published: 2023-12-21
- Earliest claimed: 2020-09-30
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Hayato TSUDA; Tadaharu ISAKA; Yumi ZENKE; Yukari YAMAMOTO; Takahisa AOYAMA
- Web page: https://patentgrep.com/patent/US20230411751A1

## CPC

- H01M 50/193: Organic material
- B29C 45/0001: {characterised by the choice of material}
- C08F 8/22: by reaction with free halogens
- C08F 114/26: Tetrafluoroethene
- C08F 214/262: {with fluorinated vinyl ethers}
- C08L 27/18: Homopolymers or copolymers or tetrafluoroethene
- C09D 127/18: Homopolymers or copolymers of tetrafluoroethene
- C09D 127/20: Homopolymers or copolymers of hexafluoropropene
- C09K 3/1009: {Fluorinated polymers, e.g. PTFE}
- H01B 3/445: {from vinylfluorides or other fluoroethylenic compounds}
- H01G 9/10: Sealing, e.g. of lead-in wires
- H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
- H01G 11/74: Terminals, e.g. extensions of current collectors
- H01G 11/78: Cases; Housings; Encapsulations; Mountings
- H01G 11/80: Gaskets; Sealings
- H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence)
- H01M 50/184: characterised by their shape or structure
- H01M 50/188: the sealing members being arranged between the lid and terminal
- H01M 50/198: characterised by physical properties, e.g. adhesiveness or hardness
- B29K 2027/18: PTFE, i.e. polytetrafluoroethylene {, e.g. ePTFE, i.e. expanded polytetrafluoroethylene}
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A power storage assembly having a gasket containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.0 to 4.5% by mass with respect to the whole of the monomer units, a melt flow rate of 5 to 36 g/10 min, and the number of functional groups of —CF═CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms, wherein the gasket has a thickness of 0.5 to 2.5 mm.

## Claims

### Claim 1

A power storage assembly comprising a gasket containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.0 to 4.5% by mass with respect to the whole of the monomer units, a melt flow rate of 5 to 36 g/10 min, and the number of functional groups of —CF═CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of more than 50 per 106 main-chain carbon atoms, wherein the gasket has a thickness of 0.5 to 2.5 mm.

### Claim 2 (depends on 1)

The power storage assembly according to claim 1, wherein the gasket has a sealing area of 0.5 to 50 cm2.

### Claim 3 (depends on 1)

The power storage assembly according to claim 1, wherein the gasket is in a state of being compressed at a compression deformation rate of 20 to 60%.

### Claim 4 (depends on 1)

The power storage assembly according to claim 1, wherein the copolymer has a melting point of 301 to 317° C.

### Claim 5 (depends on 1)

The power storage assembly according to claim 1, wherein the copolymer has a quantity of heat of melting of 24.0 mJ/mg or higher.

### Claim 6 (depends on 1)

The power storage assembly according to claim 1, wherein the copolymer has a fluorine content of lower than 70% by mol.

### Claim 7 (depends on 1)

The power storage assembly according to claim 1, wherein the gasket is an injection molded article or a transfer molded article.

### Claim 8 (depends on 1)

The power storage assembly according to claim 1, the power storage assembly comprising:
an exterior can;
an electric element housed in the exterior can;
a lid to close an opening of the exterior can; and
an external terminal installed on the lid,
wherein the gasket is held between the lid and the external terminal.