| 摘要 |
PROBLEM TO BE SOLVED: To provide a storage battery having improved efficient discharge characteristic by collecting electricity from plates of all parts of an electrode group even in the case where a positive electrode collector or a negative electrode collector are formed at a degree of dimension capable of avoiding contact with a metal outer can or without using collectors. SOLUTION: This spiral electrode is formed by bending core exposed parts 11a of positive plates 12 projected in an upper part of a spiral electrode group 10 in order from the inner peripheral part toward the peripheral part at a right angle against the direction of the inner peripheral part of the spiral electrode group 10, and overlapping the core exposed parts 11a of the outer peripheral part with the core exposed parts 11a of the inner peripheral part. These overlapped core exposed parts 11a are flattened by pressurization, and the positive collectors are welded to the top surface of each core exposed part 11a, and the negative collectors are welded to a lower surface of each core exposed part 13a of the negative plates 14. |
