Patent ID: 11923500
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC H

Claim 14:
15. A method for producing a battery packaging material, the battery packaging material being formed of a laminate in which at least polyethylene terephthalate, a first adhesive layer, nylon, a second adhesive layer, a metal layer including an acid resistance film on at least one surface, a third adhesive layer, and a sealant layer are laminated in this order, the laminate satisfying the relationship of A+B≥2.50, where A+B is a sum of a value A of a ratio of a stress in elongation by 40% to a stress in elongation by 10% in the MD direction and a value B of a ratio of a stress in elongation by 40% to a stress in elongation by 10% in the TD direction,
the method comprising:
preparing a laminate A comprising the polyethylene terephthalate, the first adhesive layer, the nylon, the second adhesive layer, and the metal layer including the acid resistance film on at least one surface; and
pouring a melted resin for formation of the third adhesive layer between the metal layer including the acid resistance film on at least one surface in the laminate A and the sealant layer formed in a sheet shape beforehand, and bonding the laminate A and the sealant layer together with the third adhesive layer interposed therebetween, by a sandwich lamination method.