| 摘要 |
PROBLEM TO BE SOLVED: To prevent short-circuit by enhancing strength of a separator on an outer side of a positive electrode plate of a group of coiled electrodes causing short-circuit without degrading battery characteristics. SOLUTION: A thickness and weight of a first separator 13 arranged on an outer side of a positive electrode plate 11 of a group of electrodes 10A are greater than a thickness and weight of a second separator 14 arranged on an inner side of the positive electrode plate 11. An occupying rate of the separators in a battery is approximately equal to a case that the thickness and weight of the first and second separators are equal. With this structure, short-circuit caused by a chip and a breakage of the positive electrode plate on the outer side of the positive electrode plate 11 is prevented without degrading battery characteristics.
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