Exterior material for power storage device, production method therefor, film, and power storage device

Patent metadata

Field	Value
Publication number	US-2024380037-A1
Application number	US-202218691543-A
Country	US
Kind code	A1
Filing date	Sep 15, 2022
Priority date	Sep 15, 2021
Publication date	Nov 14, 2024
Grant date	—

Abstract

An exterior material for a power storage device, said exterior material constituted from a laminate that at least comprises a base material layer, a barrier layer, and a heat-fusible resin layer in the stated order, wherein the heat-fusible resin layer includes a film, and the film has a tensile elongation at break in a 150° C. environment of 750% or more.

First claim

1 . An exterior material for electrical storage devices comprising a laminate including at least a base material layer, a barrier layer and a heat-sealable resin layer in this order,
the heat-sealable resin layer including a film, the film having a tensile rupture elongation of 750% or more in an environment at 150° C.

2 . The exterior material for electrical storage devices according to claim 1 , wherein the film has a tensile rupture elongation of 650% or more in an environment at 120° C.

3 . The exterior material for electrical storage devices according to claim 1 , wherein a resin forming the film includes at least a polyester structure A.

4 . The exterior material for electrical storage devices according to claim 3 , wherein the polyester structure A is a polybutylene terephthalate structure.

5 . The exterior material for electrical storage devices according to claim 3 , wherein the resin forming the film further includes at least one selected from the group consisting of a polyether structure and a polyester structure B.

6 . The exterior material for electrical storage devices according to claim 5 , wherein the polyester structure B is a polyester structure obtained by polycondensation of a polyol forming the polyester structure A and at least one dicarboxylic acid selected from the group consisting of isophthalic acid, sebacic acid and dodecanedionic acid.

7 . The exterior material for electrical storage devices according to claim 5 , wherein the polyether structure is a polyether structure derived from at least one selected from the group consisting of polytetramethylene ether glycol and neopentyl glycol.

8 . The exterior material for electrical storage devices according to claim 1 , wherein an indentation elastic modulus of the laminate from the heat-sealable resin layer side is 0.3 GPa or more.

9 . The exterior material for electrical storage devices according to claim 1 , for an all-solid-state battery, a semi-solid-state battery, a pseudo-solid-state battery, a polymer battery, or an all-polymer battery.

10 . A film having a tensile rupture elongation of 750% or more in an environment of 150° C.

11 . The film according to claim 10 , wherein the film has a tensile rupture elongation of 650% or more in an environment at 120° C.

12 . The film according to claim 10 , wherein a resin forming the film includes at least a polyester structure A.

13 . The film according to claim 12 , wherein the polyester structure A is a polybutylene terephthalate structure.

14 . The film according to claim 12 , wherein the resin forming the film further includes at least one selected from the group consisting of a polyether structure and a polyester structure B.

15 . The film according to claim 14 , wherein the polyester structure B is a polyester structure obtained by polycondensation of a polyol forming the polyester structure A and at least one dicarboxylic acid selected from the group consisting of isophthalic acid, sebacic acid and dodecanedionic acid.

16 . The film according to claim 14 , wherein the polyether structure is a polyether structure derived from at least one selected from the group consisting of polytetramethylene ether glycol and neopentyl glycol.

17 . The film according to claim 10 , wherein an indentation elastic modulus of the film is 0.3 GPa or more.

18 . The film according to claim 10 , wherein the film is used for a heat-sealable resin layer of an exterior material for electrical storage devices.

19 . A method for manufacturing an exterior material for electrical storage devices, comprising the step of preparing a laminate in which at least a base material layer, a barrier layer and a heat-sealable resin layer are laminated in this order,
the heat-sealable resin layer including a film, the film having a tensile rupture elongation of 750% or more in an environment at 150° C.

20 . The method for manufacturing an exterior material for electrical storage devices according to claim 19 , wherein the exterior material for electrical storage devices is to be used for an all-solid-state battery, a semi-solid-state battery, a pseudo-solid-state battery, a polymer battery, or an all-polymer battery.

21 . An electrical storage device in which an electrical storage device element including at least a positive electrode, a negative electrode and an electrolyte is housed in a packaging formed of the exterior material for electrical storage devices according to claim 1 .

Assignees

• Dainippon Printing Co Ltd

Inventors

• Kagata Tsubasa
• Tabuchi Naoto
• Sasaki Miho
• Okano Ai

Classifications

• C08J5/18

  Manufacture of films or sheets · CPC title

• B32B2307/7246

  Water vapor barrier · CPC title

• B32B2307/31

  Heat sealable · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B2457/10

  Batteries · CPC title