| 摘要 |
A battery manufacturing method including accommodating elements for electromotive force in a battery case having an oval cross section, placing a sealing member on an open end of the battery case with a gasket interposed therebetween, and sealing the battery by inwardly crimping the open end of the battery case. In the sealing step, long side edges of the battery case are crimped by a forming surface having a rounded cross section, and arc-shaped edges connecting both long side edges are crimped by a flat forming surface. 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 is thus provided.
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