| 摘要 |
PROBLEM TO BE SOLVED: To provide an ON-OFF switch which is easily miniaturized and allows easy setting of its operation temperature. SOLUTION: A contact device 15 comprising fixed conductors 11 and 12 and a movable conductor 13 and a diode 31 connected to the contact device 15 in parallel are connected to each of a plurality of cells of a battery no shown in parallel. When the cell is damaged, thereby becoming into an open state, a current flows through the diode 31 and the Joule heat is transmitted to a shaft 2 made of thermoplastic resin. The shaft 2 melts when its temperature increases to a predetermined temperature, and the movable conductor 13 is pushed by a spring 41 so that it moves downward to contact with the fixed conductors 11 and 12 to close the contact device 15. Thus, the current to flow the damaged cell is bypassed by the contact device 15. Since the simple structure in which the movable conductor 13 moves by melting the shaft 2 is used, the ON-OFF switch can be miniaturized and its operation temperature is easily set by selecting thermal thermoplastic resin. COPYRIGHT: (C)2007,JPO&INPIT
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