| 摘要 |
PROBLEM TO BE SOLVED: To prevent positive electrode plates from causing a short circuit by contacting with negative electrode plates by installing them on side surfaces close to a focusing place on the other ends of respective positive electrode tabs among side surfaces of the positive electrode plates when one ends of the positive electrode tabs are installed on side surfaces of the positive electrode plates. SOLUTION: Negative electrode plates 32 and positive electrode plates 31 on which one ends 34b of positive electrode tabs 34 are installed, are arranged in large numbers through separators 33, and are integrally formed, and a plate group 3A is formed. At this time, side surfaces of the positive electrode plates 31 on which one ends 34b of the positive electrode tabs 34 are installed, are formed as side surfaces 31a close to a focusing place J of the other ends 34a of the positive electrode tabs 34. Therefore, force running in the arrow P direction is applied to the positive electrode tabs 34, and even if the positive electrode tabs 34 deflect, since the positive electrode tabs 34 only push recessed parts 31c of the positive electrode plates 31 in the arrow Q direction, even if a welded part is separated, a short circuit is not caused by contacting with the negative electrode plates 32. |
