| 摘要 |
PROBLEM TO BE SOLVED: To provide a composition, which is compatible with a voltage charac teristic (output characteristic) and a capacity characteristic at the time of elec tric discharge, with sufficient productivity in a collector for batteries of a thin shape, having a thickness of about 1.0 mm or less. SOLUTION: A 1st opening 2a is formed to a 1st collector part 2, which adjoins a collector ear 4 of the collector by punching, and a 2nd opening 3b is formed at an operature rate higher than that of the 1st collector part 2 by expansion processing to a 2nd collector part 3, which is by a side of opposite to the collector ear 4 of this 1st opening 2a.
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