| abstract |
[PROBLEMS] To provide a battery packaging material having high piercing strength, excellent electrolytic solution resistance and moldability even though a laminate is laminated with a stainless steel foil having low formability instead of aluminum foil. Offer. A battery packaging material comprising a laminate having at least a base material layer, a stainless steel foil, and a sealant layer in this order, wherein at least the sealant layer side of the stainless steel foil is fluorinated. A battery packaging material in which a hydrogen-resistant chemical conversion treatment layer 3b is formed. [Selection] Figure 1 |