| 摘要 |
Electric power elements (positive and negative electrode mixtures 2 and 3) are included in a cylindrical battery case 1 with a base also serving as one electrode terminal (positive electrode terminal), an opening portion of the battery case 1 is sealed with an external terminal plate 7 serving as the other electrode terminal (negative electrode terminal) with an insulating sealing body 5 interposed therebetween. An outer surface of the battery case 1 is coated with an insulating exterior label 8. The opening portion of the battery case 1 is sealed with the external terminal plate 7 by inwardly bending an opening edge portion of the battery case 1 into an arc shape to crimp the battery. An arc radius of the crimped portion 1a is in a range from 0.5 mm to 1.5 mm. An outer diameter of the battery is in a range from 14.20 mm to 14.35 mm.
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