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

Claim 9:
10. A method for producing a battery packaging material,
the battery packaging material being formed of a laminate in which at least a base material layer, a first adhesive layer, a metal layer including an acid resistance film on at least one surface, a second 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:
a first step of applying a solution containing a compound to be used for formation of the acid resistance film to at least one surface of the metal layer and then heating the metal layer to form the metal layer including the acid resistance film on at least one surface;
a second step of performing a dry lamination method including:
applying an adhesive agent for formation of the first adhesive layer to the base material layer or the metal layer and drying the adhesive agent, and
then laminating the base material layer, the adhesive agent, and the metal layer, and curing the adhesive agent to form a first laminate in which the base material layer, the first adhesive layer, and the metal layer are laminated in this order; and

a third step of forming the sealant layer on a side of the metal layer opposite to the first adhesive layer in the first laminate, with the second adhesive layer interposed therebetween, to form a second laminate in which the base material layer, the first adhesive layer, the metal layer, the second adhesive layer, and the sealant layer are laminated in this order.