Patent ID: 9257682
Filing Date: 2016-02-09
CPC Classification: B21D,H01M,Y02E,Y10T

Claim Text:
1. A method for manufacturing an external cladding for a laminate battery wherein; an external cladding for a laminate battery, in which a projecting portion for housing a battery element is formed is manufactured by using as a material austenitic stainless steel foil having a thermoplastic resin layer on one of a front surface and a rear surface and a lubricating film on the other of the front surface and the rear surface; disposing the stainless steel foil such that the surface provided with the thermoplastic resin layer is opposite a punch; and implementing drawing on the stainless steel foil without using lubricating oil in a condition where an annular region of the stainless steel foil, which is contacted by a shoulder portion of the punch, is set at a temperature between 0° C. and 20° C., and an exterior region on an exterior of annular annular region is set at a temperature between 40° C. and 100° C. while softening the lubricating film by the heat of the exterior region, wherein the lubricant film is a resin film formed from one or more types of resins selected from a polyvinyl alcohol resin, urethane resin, and acrylic resin, wherein the ratio between a weight of OH groups and a total weight of the resin is no less than 0.2.