| 摘要 |
PURPOSE:To enhance battery capacity and reduce deterioration of the battery capacity that accompanies a charging-and-discharging cycle by eliminating an ineffective space in a battery case, accurately opposing as many positive electrodes and negative electrodes as possible so that no current deviation is caused, and accomodating them closely in the battery case without breaking a separator in a square-shaped nonaqueous electrolyte secondary battery. CONSTITUTION:When being wrapped in a separator 3, a strip-like positive electrode 1 is folded back at one of edges along the longitudinal direction of the positive electrode 1, and is fused at the other end to form a fused part 3a. Accordingly, the positive electrode 1 can be enlarged while no ineffective space is generated in a battery case 5. This bag-like separator 3 is pinched in a valley fold of a negative electrode 4 formed in such a way that it is bent like a folding screen so that the fused part 3a is contacted therewith. Accordingly, rupture of the separator 3 is prevented while the current deviation at the fold of the negative electrode is suppressed by utilizing the nature that the fused part 3a of the separator 3 has no function as a separator. |
