Power storage device packaging material and power storage device using the packaging material

Patent metadata

Field	Value
Publication number	US-2021057683-A1
Application number	US-202017093514-A
Country	US
Kind code	A1
Filing date	Nov 9, 2020
Priority date	Jun 27, 2018
Publication date	Feb 25, 2021
Grant date	—

Abstract

A packaging material for a power storage device having a laminate structure in the following order including a substrate layer, a first adhesive layer, a metal foil layer, a second adhesive layer, and an inner layer containing a polyester-based resin. The inner layer has a melting peak temperature during melting in a range of 160 to 280° C. which is measured by a differential scanning calorimeter. The substrate layer has a melting peak temperature that is higher than the melting peak temperature of the inner layer.

First claim

What is claimed is:

1 . A packaging material for a power storage device, comprising:
a laminate structure comprising: a substrate layer; a first adhesive layer; a metal foil layer; a second adhesive layer; and an inner layer containing a polyester-based resin, in this order, wherein, the inner layer has a melting peak temperature during melting in a range of 160 to 280° C. which is measured by a differential scanning calorimeter, and the substrate layer has a melting peak temperature that is higher than the melting peak temperature of the inner layer.

2 . The packaging material of claim 1 , wherein the packaging material is for an all-solid-state battery.

3 . The packaging material of claim 1 , wherein the inner layer has a single-layer structure.

4 . The packaging material of claim 1 , wherein the inner layer has a multi-layer structure comprising:
a first layer containing a polyester-based resin and having a melting peak temperature in a range of 170 to 280° C. and a second layer formed on an inner surface of the first layer and containing a thermosetting resin.

5 . The packaging material of claim 1 , wherein the inner layer has a multi-layer structure comprising:
a first layer containing a polyester-based resin and having a melting peak temperature in a range of 170 to 280° C., and a second layer formed on an inner surface of the first layer and containing a polyester-based resin, wherein the second layer has a melting peak temperature in a range of 160 to 270° C., and the melting peak temperature of the second layer is lower than the melting peak temperature of the first layer.

6 . The packaging material of claim 5 , wherein between a melting point T A of the first layer and a melting point T B of the second layer, there is a difference T A −T B which is 10° C. or more.

7 . The packaging material of claim 4 , further comprising
a third layer formed on a surface of the first layer, wherein the second layer and the third layer are on opposite sides of the first layer, wherein the third layer contains a polyester-based resin and has a melting peak temperature in a range of 160 to 270° C. and which is lower than the melting peak temperature of the first layer.

8 . The packaging material of claim 4 , further comprising
a third layer formed on a surface of the first layer, wherein the second layer and the third layer are on opposite sides of the first layer, wherein the third layer contains a thermosetting resin.

9 . The packaging material of claim 1 , wherein
the polyester-based resin is at least one of polyethylene terephthalate and polyethylene terephthalate-based resin.

10 . The packaging material of claim 9 , wherein
the polyethylene terephthalate-based resin includes a structural unit derived from ethylene glycol, a structural unit derived from terephthalic acid, and an other structural unit, and a dihydric alcohol component from which the other structural unit is derived is at least one selected from a group consisting of neopentyl glycol, 1,4-butadiol, and diethylene glycol.

11 . The packaging material of claim 9 , wherein
the polyethylene terephthalate-based resin includes a structural unit derived from ethylene glycol, a structural unit derived from terephthalic acid, and an other structural unit, and an acid component from which the other structural unit is derived is at least one selected from a group consisting of isophthalic acid, adipic acid, and sebacic acid.

12 . The packaging material of claim 1 , wherein
the first adhesive layer and the second adhesive layer are composed of a cured product of a thermosetting adhesive.

13 . A power storage device comprising:
a power storage device body; a current drawing terminal extending from the power storage device body; and the packaging material of claim 1 arranged to clamp the current drawing terminal and house the power storage device body.

14 . The power storage device of claim 13 , wherein the power storage device is an all-solid-state battery.

Assignees

• Toppan Printing Co Ltd

Inventors

• Sasaki Satoshi
• Muraki Takuya
• Oono Naoto

Classifications

• H01M50/116

  characterised by the material · CPC title

• H01M50/10

  Primary casings; Jackets or wrappings · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/55

  on the same side of the cell · CPC title