| 摘要 |
PROBLEM TO BE SOLVED: To equalize a current flowing in a region surrounded by a frame member during charge and discharge.SOLUTION: Lateral grids 13, 23 of each cast grid body 11, 21 of a positive electrode plate and a negative electrode plate are configured so that the distance of adjoining lateral grids 13, 23 is shorter as separating from ear parts 16, 26. When configuring each lateral grid 13, 23 in such a manner, the total cross-sectional area in each divided region, obtained by dividing a region surrounded by frame members 12, 22 at regular intervals in the extension direction of longitudinal grids 14, 24, becomes larger as separating from the ear part 26. |
