| 摘要 |
PROBLEM TO BE SOLVED: To simply judge battery failure by continuously measuring the voltage of a combined battery, judging whether the voltage is abruptly lowered more than the lowering caused by the discharge, and in the case where it is lowered abruptly, judging the combined battery to have failure. SOLUTION: A power supply circuit 2 inputs commercial alternating current to a combined battery 1 connecting a plurality of battery units in parallel to be charged, and is supplied to an electric instrument such as an air conditioner. In addition, the output of the combined battery 1 is input to be supplied to the electric instrument such as the air conditioner. A judging part 3 inputs the voltage and the discharge current of the combined battery 1, and the failure of the combined battery 1 is judged. The discharge current amount of the combined battery 1 is integrated, the voltage is measured to find the change amount, and it is judged whether the change amount is larger than a prescribed reference value or not. In the case whether the change value is larger than the prescribed reference value, the integrated value of the discharge current amount is stored, and it is judged whether the counted value of a change point generation counter is larger than the prescribed reference time-number. In the case where it is larger than the prescribed reference time-number, an alarm indicating the inferiority of the combined battery 1 is generated to complete processing.
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