| 摘要 |
PURPOSE:To improve safety at the time of internal short circuit by electrically connecting, only via resistors having PTC effects respectively, respective electrodes wherein any of positive and negative electrodes composing a battery element is electrically divided into plural. CONSTITUTION:Respective electrodes, wherein any of the positive and negative electrodes of an electrode is electrically divided into (n) (n>2), are connected only via resistors 10 having PTC effects. Consequently, when a battery is internally shortcircuited at a point A, surely resistors 10 exist in a flow path wherein current generated by negative electrodes 12-1n and positive electrodes 22--2n, that is, a path via negative electrode leads 52-5n and a negative electrode lead 51. Consequently, in current (n-1) (i) generated in the negative electrodes 12-1n and the positive electrodes 22-2n, excessive current is cut-by the PTC effect of the resistor 10 to reduce inflow into the point A. As a result, the current (i) generated in the negative and positive electrodes 11 and 21 becomes most of short circuit current in the point A. Accordingly, high temperature in the point A can be eliminated even in a battery having large (n), that is, large capacity to improve safety. |
