| 摘要 |
PROBLEM TO BE SOLVED: To prevent abnormal heat generation of a battery when the battery is broken by arranging the specified shorting component within the space of a winding core of an electrode group. SOLUTION: A secondary battery is constituted with a power generating element comprising an electrode plate group formed by winding a positive electrode 5 and a negative electrode 6 both formed by applying an active material to a current collector through a separator 7 and an electrolyte, a battery case 3 also serving as the terminal of the negative electrode 6, a sealing plate 1 also serving as the terminal of the positive electrode 5, and a shorting component 9 arranged within the space of a winding core of the electrode group. The current collectors, locating in the innermost circumference of the electrode group, of the positive and negative electrodes 5, 6 are exposed, the shorting component 9 is arranged on the inside of the exposed parts of the current collectors, and the exposed parts of the current collectors of the positive and negative electrodes 5, 6 are faced through the separator 7 in the innermost circumference of the electrode group. When the battery is broken, the exposed parts of the current collectors of the positive and negative electrodes 5, 6 are pressed against each other by the shorting component 9, the separator 7 is broken and the current collectors are short-circuited. |
