Packaging material for power storage device, packaging case for power storage device, and power storage device

Patent metadata

Field	Value
Publication number	US-2018123093-A1
Application number	US-201715799437-A
Country	US
Kind code	A1
Filing date	Oct 31, 2017
Priority date	Oct 31, 2016
Publication date	May 3, 2018
Grant date	—

Abstract

A packaging material for a power storage device includes a heat resistant resin layer 2 as an outer layer, a sealant layer 3 as an inner layer, and a metal foil layer 4 arranged between these layers. The sealant layer 3 is composed of one layer or a plurality of layers. The innermost layer 7 of the sealant layer contains a random copolymer containing propylene as a copolymerization component and another copolymerization component other than propylene, a roughening material, and a lubricant. The roughening material is composed of particles containing a thermoplastic resin. The center line average roughness Ra of the surface 7 a of the innermost layer 7 is 0.05 μm to 1 μm. It can provide a packaging material for a power storage device which is excellent in formability and hard to generate white powder on the surface.

First claim

1 . A packaging material for a power storage device, comprising:
a heat resistant resin layer as an outer layer; a sealant layer as an inner layer; and a metal foil layer arranged between the two layers, wherein the sealant layer is composed of one layer or a plurality of layers, and an innermost layer of the sealant layer contains a random copolymer containing propylene as a copolymerization component and another copolymerization component other than propylene, an roughening material, and a lubricant, the roughening material is composed of particles containing a thermoplastic resin, and a center line average roughness Ra of a surface of the innermost layer is 0.05 μm to 1 μm.

2 . The packaging material for a power storage device as recited in claim 1 , wherein
the thermoplastic resin constituting the roughening material is a high-density polyethylene resin.

3 . The packaging material for a power storage device as recited in claim 2 , wherein
a density of the high-density polyethylene resin is 0.935 g/cm 3 to 0.965 g/cm 3 , and a melt flow rate of the high-density polyethylene resin at 190° C. is within a range of 0.01 g/10 min to 2 g/10 min.

4 . The packaging material for a power storage device as recited in claim 1 , wherein
a content rate of the roughening material in the innermost layer of the sealant layer is 1 mass % to 30 mass %, and a content rate of the lubricant in the innermost layer exceeds 0 ppm and is equal to or less than 1,000 ppm.

5 . The packaging material for a power storage device as recited in claim 1 , wherein
the lubricant is one or more lubricants selected from the group consisting of fatty acid amide, wax, silicone, and paraffin.

6 . The packaging material for a power storage device as recited in claim 1 , wherein
the sealant layer is composed of a plurality of layers.

7 . The packaging material for a power storage device as recited in claim 6 , wherein
the sealant layer includes the innermost layer and a first intermediate layer laminated on a surface of the innermost layer on a side of the metal foil layer, the first intermediate layer contains an elastomer-modified olefin-based resin, the elastomer-modified olefin-based resin is composed of elastomer-modified homopolypropylene and/or an elastomer-modified random copolymer, and the elastomer-modified random copolymer is an elastomer modified product of a random copolymer containing propylene as a copolymerization component and another copolymerization component other than propylene.

8 . The packaging material for a power storage device as recited in claim 6 , wherein
the sealant layer includes the innermost layer, a first intermediate layer laminated on a surface of the innermost layer on a side of the metal foil layer, and a second intermediate layer laminated on a surface of the first intermediate layer on a side of the metal foil layer, the first intermediate layer contains an elastomer-modified olefin-based resin, the elastomer-modified olefin-based resin is composed of elastomer-modified homopolypropylene and/or an elastomer-modified random copolymer, the elastomer-modified random copolymer is an elastomer modified product of a random copolymer containing propylene as a copolymerization component and another copolymerization component other than propylene, and the second intermediate layer contains a random copolymer containing propylene as a copolymerization component and another copolymerization component other than propylene.

9 . A packaging case for a power storage device, the packaging case being composed of a shaped body of the packaging material for a power storage device as recited in claim 1 .

10 . A power storage device comprising:
a power storage device main body; and a packaging material composed of the packaging material for a power storage device as recited in claim 1 , wherein the power storage device main body is packaged by the packaging material.

Assignees

• Showa Denko Packaging Co Ltd

Inventors

• Yoshino Kenji
• Karatsu Makoto

Classifications

• H01M10/00 Primary

  Secondary cells; Manufacture thereof · CPC title

• H01M50/131 Primary

  characterised by physical properties, e.g. gas permeability, size or heat resistance · CPC title

• H01M50/197

  having a layered structure · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title