| 摘要 |
PURPOSE:To prevent the explosion or rupture of a cell when the cell internal pressure is increased by the large-current discharge or charge by storing an electrode plate group having a cutoff type current collecting terminal into a cell can formed with recesses and projections on the periphery and connecting this terminal to a cell cover. CONSTITUTION:An electrode plate group 1 is stored in a cell can 7, then the electrode plate group 1 and a cutoff type current collecting terminal 2 are pressed into the cell can 7 by a cell cover 3. Next, when the large-current discharge or charge is performed, the internal pressure of the cell is increased. The cell is designed so that the recesses and projections 6 of the cell can 7 are made flat and the cell is extended in the longitudinal direction when the internal pressure reaches the safety limit. When the internal pressure reaches the safety limit, the cell can 7 is thereby extended, and the cutoff type current collecting terminal 2 is pulled and cut off. The electric discharge or charge of the cell is stopped by this cutoff, thus the internal pressure is not increased further. The explosion or rupture of the cell can be prevented accordingly. |
