| 摘要 |
PURPOSE:To prevent deterioration, etc., of battery performance that could be caused by damage to an electrode and a short circuit caused in a non-circular spiral electrode body or by unevenness of the tension of the electrode by providing a hollow, metallic pipe in the center through hole portion of the spiral electrode body. CONSTITUTION:A hollow, metallic pipe 1 is provided in the center through hole portion of a spiral electrode body 2. When the roundness of the circular electrode body 2 is decreased by pressing, curvature of less than a certain amount, formed by the outer periphery of the pipe 1, is secured even at the innermost peripheral portion of the electrode body 2, so an internal short circuit that could be caused by damage to the electrode or by the absence of the electrode can be prevented. Also the tension of the inner peripheral portion of the electrode is prevented from becoming uneven and even tension is maintained so that battery reaction is accelerated, and that discharge characteristics, and cycle characteristics in the case of a secondary battery, can be enhanced. Further, a pipe 1 at the center portion of a non-circular spiral electrode body can be used directly as a current collector core, so manufacturing processes can be simplified. |
