EXTERIOR MATERIAL FOR ELECTRICITY STORAGE DEVICE EXTERIOR CASE FOR ELECTRICITY STORAGE DEVICE AND ELECTRICITY STORAGE DEVICE

摘要

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 (7a) of the innermost layer (7) is 0.05 um to 1 um. The present invention can provide the packaging material for a power storage device which is excellent in formability and hard to generate white powder on a surface thereof.