| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To completely prevent some damage from being done to a battery by an overcurrent. <P>SOLUTION: A thermostat 12 with PTC is inserted into a discharge current path of a battery cell. The thermostat 12 with PTC is formed by connecting a current path going through the thermostat with a current path going through a PTC element in parallel. In an ordinary state, a discharge current runs via the thermostat. An overcurrent I1 heats a bimetal, so that contacts of the thermostat are separated from each other and the overcurrent is bypassed to the PTC element. In addition, the resistance of the PTC element becomes higher, and the current running through the PTC element is limited or shut down. An off state of the thermostat is maintained, provided that the overcurrent runs. When the overcurrent is lost, the resistance of the PTC element becomes smaller, so that the thermostat is turned on to return to the ordinary state. The characteristic of the thermostat 12 with PTC is set so that the overcurrent is limited to prevent some damage from being done to the battery cell. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
