| 摘要 |
A battery manufacturing method including a step of accommodating elements for electromotive force (3) in a battery case (2) having an oval cross section, a step of placing a sealing member (5) on an open end of the battery case (2) with a gasket interposed therebetween, and a step of sealing the battery by inwardly crimping the open end of the battery case (2). In the sealing step, long side edges (2a) of the battery case (2) are crimped by a forming surface (17) having a rounded cross section, and arc-shaped edges (2b) connecting both long side edges are crimped by a flat forming surface (18). A battery having excellent safety properties with no risk of liquid leakage due to its uniform, airtight, and highly reliable seal around the entire circumference of the open end of the battery case (2) is thus provided. |
