Exterior material for power storage device, manufacturing method therefor, and power storage device

Patent metadata

Field	Value
Publication number	US-2025219203-A1
Application number	US-202318853214-A
Country	US
Kind code	A1
Filing date	Apr 4, 2023
Priority date	Apr 6, 2022
Publication date	Jul 3, 2025
Grant date	—

Abstract

This exterior material for a power storage devices is composed of a laminate including at least a base material layer, a barrier layer, and a heat-fusible resin layer in this order, the base material layer is composed of two or more layers, the base material layer includes one or more polyester films, and the base material layer has a work hardening index of 2.5 or more and 4.5 or less in both the longitudinal direction and the width direction and a difference in the work hardening index in the longitudinal direction and the width direction of 1.4 or less.

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, wherein the base material layer is composed of two or more layers, includes one or more polyester films, and has a work-hardening index of 2.5 or more and 4.5 or less in both a longitudinal direction and a width direction, and a difference in work-hardening index between the longitudinal direction and the width direction is 1.4 or less.

2 . The exterior material for electrical storage devices according to claim 1 , wherein the polyester film has an intrinsic viscosity of 0.66 dl/g or more and 1.00 dl/g or less.

3 . The exterior material for electrical storage devices according to claim 1 , wherein the polyester film has a rigid-amorphous content of 5% or more and 60% or less.

4 . The exterior material for electrical storage devices according to claim 1 , wherein a thickness of the polyester film is 5 μm or more and 40 μm or less.

5 . The exterior material for electrical storage devices according to claim 1 , wherein the polyester film has a melting point of 235° C. or higher.

6 . The exterior material for electrical storage devices according to claim 1 , wherein a crystallinity degree of the polyester film is 15% or more and 40% or less.

7 . The exterior material for electrical storage devices according to claim 1 , wherein a rupture elongation of the base material layer in at least one of the longitudinal direction and the width direction is 80% or more.

8 . 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 .

9 . A method for manufacturing an exterior material for electrical storage devices, comprising the step of laminating at least a base material layer, a barrier layer and a heat-sealable resin layer in this order to obtain a laminate, wherein the base material layer is composed of two or more layers, includes one or more polyester films, and has a work-hardening index of 2.5 or more and 4.5 or less in both a longitudinal direction and a width direction, and a difference in work-hardening index between the longitudinal direction and the width direction is 1.4 or less.

10 . The exterior material for electrical storage devices according to claim 2 , wherein the polyester film has a rigid-amorphous content of 5% or more and 60% or less.

11 . The exterior material for electrical storage devices according to claim 2 , wherein a thickness of the polyester film is 5 μm or more and 40 μm or less.

12 . The exterior material for electrical storage devices according to claim 2 , wherein the polyester film has a melting point of 235° C. or higher.

13 . The exterior material for electrical storage devices according to claim 2 , wherein a crystallinity degree of the polyester film is 15% or more and 40% or less.

14 . The exterior material for electrical storage devices according to claim 2 , wherein a rupture elongation of the base material layer in at least one of the longitudinal direction and the width direction is 80% or more.

15 . 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 2 .

Assignees

• Dainippon Printing Co Ltd

Inventors

• Nakamura Chihiro
• Miyake Kayoko
• Hiraki Kenta
• Takahagi Atsuko

Classifications

• H01G11/78 Primary

  Cases; Housings; Encapsulations; Mountings · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/121

  Organic material · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title