WOUND BODY ELECTRODE GROUP FOR ACCUMULATOR AND ALKALI STORAGE BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a wound body electrode group in which an electrode crack is not generated at the time of manufacture as a wound body electrode group for an accumulator and to provide an alkali accumulator suitable for a large current usage using such a wound body electrode group. SOLUTION: In this wound body electrode group into which a pair of positive and negative electrodes is wound through a separator, at least one electrode of the positive electrode or the negative electrode is constituted of the electrode 1 in which an active substance 3 is filled in a metal porous substrate 2. In the electrode 1, the metal porous substrate 2 does not contain the active substance 3 and is exposed at both ends 2a in a width direction (a direction perpendicular to a winding direction). The metal porous substrate 2 is rolled and a plurality of cut portions 2b are provided at the exposed portion (the ends 2a).