| 摘要 |
PURPOSE:To ensure good electrical contact between a positive electrode and a positive electrode case by covering the inner surfaces of a positive electrode ring and the case in contact with the positive electrode as the current collector thereof. CONSTITUTION:The hole of the bottom of a positive electrode ring 7 is made as large as possible, and a positive electrode 4 and a case 1 are thereby kept in direct contact with each other. Also, a conductive film 8 comprising a conductive material such as carbon is formed on the inner surfaces of the positive electrode ring 7 (i.e. bottom portion other than area having holes) and the case 1 in contact with the positive electrode 4. Namely, the positive electrode ring 7 and the case 1 are dried at a high temperature after forming the conductive film 8 and, therefore, no oxide film is formed at a portion in contact with the positive electrode 4. Also, no oxidization at high voltage does not take place. According to the aforesaid construction, electrical contact between the positive electrode 4 and the case 1 can be kept in a good condition. |
