Granted Patent B2

US 12,614,795 · App. 17/679,831 · Granted Apr 28, 2026

Inventors: Tadaharu Isaka (Osaka, JP); Hayato Tsuda (Osaka, JP); Yumi Zenke (Osaka, JP); Yukari Yamamoto (Osaka, JP); Takahisa Aoyama (Osaka, JP)

Assignee: DAIKIN INDUSTRIES, LTD.

H01M50/193H01M50/188

Abstract

Claims (20)

1 . A nonaqueous electrolyte battery comprising a gasket containing a copolymer containing a 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 6.0% by mass with respect to the whole of the monomer units, a melt flow rate of 0.5 to 55 g/10 min, and the number of functional groups of 50 or less per 10 6 main-chain carbon atoms.

2 . The nonaqueous electrolyte battery according to claim 1 , wherein the content of the perfluoro(propyl vinyl ether) unit of the copolymer is 2.0 to 5.5% by mass with respect to the whole of the monomer units.

3 . The nonaqueous electrolyte battery according to claim 1 , wherein the gasket has a thickness of 0.5 to 2.5 mm.

4 . The nonaqueous electrolyte battery according to claim 1 , wherein the gasket has a sealing area of 0.5 to 50 cm 2 .

5 . The nonaqueous electrolyte battery according to claim 1 , wherein the gasket is in a state of being compressed at a compression deformation rate of 20 to 60%.

6 . The nonaqueous electrolyte battery according to claim 1 , wherein an amount of an electrolytic solution permeation of the copolymer is 0.0055 g/1,000 h or smaller.

7 . The nonaqueous electrolyte battery according to claim 1 , wherein the gasket is an injection molded article or a transfer molded article.

8 . The nonaqueous electrolyte battery according to claim 1 , the nonaqueous electrolyte battery 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.

9 . The nonaqueous electrolyte battery according to claim 1 , wherein the melt flow rate of the copolymer is 5 to 55 g/10 min.

10 . The nonaqueous electrolyte battery according to claim 1 , wherein the melt flow rate of the copolymer is 10 to 55 g/10 min.

11 . A method for sealing a nonaqueous electrolyte battery, the nonaqueous electrolyte battery 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, the method comprising:

disposing the gasket between the external terminal and the lid to prevent leakage and diffusion of an electrolytic solution to an outside of the nonaqueous electrolyte battery,

wherein the gasket comprises a copolymer containing a 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 6.0% by mass with respect to the whole of the monomer units, a melt flow rate of 0.5 to 55 g/10 min, and the number of functional groups of 50 or less per 10 6 main-chain carbon atoms.

12 . The method according to claim 11 , wherein the melt flow rate of the copolymer is 5 to 55 g/10 min.

13 . The method according to claim 11 , wherein the melt flow rate of the copolymer is 10 to 55 g/10 min.

Assignments (1)

Priority Claims (4)

Continuity (2)

References Cited (400)