| 摘要 |
PROBLEM TO BE SOLVED: To reduce the used amount of an electrode by using no member such as a filler or reducing the used amount of the member as much as possible, while suppressing looseness of an electrode body in a case.SOLUTION: An electrode body 23 is spirally wound to be housed in a housing space S, so that, in a longitudinal direction of the electrode body 23, a length P of the electrode body 23 after a positive electrode plate 24, a negative electrode plate 26 and a separator 25 are wound is longer than a width H of the positive electrode plate 24, the negative electrode plate 26 and the separator 25 before being wound. Accordingly, as compared with a configuration where the electrode body 23 is not spirally wound to be housed in the housing space S, looseness of the electrode body 23 in a battery case 11 can be suppressed while reducing the used amount of an electrode. |
