| 摘要 |
PURPOSE:To prevent deterioration caused by storage, reduce a danger of internal shortcircuit and improve reliability by sequentially reducing the adhesive pressure of positive and negative electrodes from the winding central section to the winding outer peripheral section and mounting a collection piece on the end of the outer periphery of the winding of the negative electrode. CONSTITUTION:The adhesive pressure of positive and negative electrodes 7 and 8 is sequentially reduced from the winding central section to the winding outer peripheral section and a collection body 16 is mounted on the end of the winding outer peripheral section of the negative electrode section 8. As a result, the reaction between the positive electrodes 7 and 8 is easy to occur at the winding central section and the negative electrode is sequentially consumed from the winding central section to the winding outer peripheral section. Thus the collection body 16 can be mounted only on the winding outer peripheral section without intermediately dividing the negative electrode 8. In this way, the cross sectional area of the collection body 16 is reduced and shortcircuit can be prevented. Besides, since the negative electrode capacity need not be increased, the positive electrode capacity can easily exceed the negative electrode capacity and the capacity deterioration during storage resulting from the unstable positive electrode can be prevented. |
