| abstract |
(57) [Summary] PROBLEM TO BE SOLVED: To enable perfect thermal fusion without wrinkles and to reduce the external dimensions to the minimum necessary. SOLUTION: In a non-aqueous electrolyte battery in which a battery element is housed in a packaging material made of a laminate film, a rectangular deep drawing is performed on the packaging material so that a deep drawing amount T is 2 to 5 mm. As a result, a space for accommodating the battery element is formed. On the inner surface of the deep-drawing-molded exterior material, the radius of curvature of the ridge corresponding to one of the two parallel sides of the two parallel sides is set. T / 2 ± 0.5mm, The rising angle θ of each side portion is set to 85 ° to 90 °. The deep drawing is performed by applying a punch and a die to an exterior material made of a laminate film, and the radius of curvature of the corner of the punch is set to 2 mm or less. |