| abstract |
At least a base material layer, a metal layer, and a laminate including a laminate in which a sealant layer is sequentially laminated, wherein the laminate has a value A of stress at 40% elongation in the MD direction and a stress value A at 10% elongation in the TD direction. A battery packaging material, wherein the sum (A+B) of the value B of the stress at 40% elongation/10% elongation in the present invention satisfies the relationship of A+B≥2.50. |