| 摘要 |
PROBLEM TO BE SOLVED: To safely and easily perform a sensor mounting work by mounting a temperature sensor for measuring the temperature of a prescribed cell on an installation member of the battery pack and providing a constitution, such that the temperature measurement of a prescribed battery pack becomes possible. SOLUTION: A battery pack 10 is mounted on a battery installation member 11, and 20 pieces of resistance temperature sensors 1 are mounted on the battery installation member 11 so as to correspond to each one of 20 cells and furthermore to be brought in contact with the bottom surfaces of the cells at the center of the bottom surfaces. The temperature sensors 1 are connected serially, and signal lines 2 drawn from both the ends are connected with a charger 12. When the battery pack 10 is installed on the battery installation member 11, the temperature sensors 1 are in contact with the bottom part of each cell and are capable of detecting the temperature. Namely, a resistance value is calculated from a voltage value or a current value outputted from the resistance temperature sensor 1, a resistance value per sensor is determined by dividing the resistance value by the number of the sensors 20, and the temperature is obtained from this resistance value through calculation. According to this temperature, charging is controlled properly.
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