| 摘要 |
PROBLEM TO BE SOLVED: To further increase the battery capacity by making surplus spaces inside a battery can minimum. SOLUTION: A diameter D of a winding core part 40 of a winding group formed by winding a band positive electrode plate 20 and a band negative electrode plate 22 through an outside separator 24 and an inside separator 26 is set at 2 mm or less. In this case, a positive electrode lead 52 is led out of a position, corresponding to a position outside at 2 mm of radius or more from the center of a winding group 16, and a negative electrode collector provided outermost of the winding group and the inner wall surface of the battery can 12 are made to electrically contact with each other through a conductive elastic member 62.
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