| abstract |
Provided is a stainless steel foil for external use of a battery, which is excellent in adhesion to a resin after a cold shock and after immersion in an electrolytic solution. An external battery stainless steel foil (1) has an oxide film containing not less than 40 mol% of Fe, less than Fe and less than 40 mol% of Si and having a thickness of 2 nm or more and has an arithmetic average roughness Ra in a direction orthogonal to the rolling direction, Is not less than 0.02 μm and less than 0.1 μm. |