| 摘要 |
PROBLEM TO BE SOLVED: To accurately calculate measurement, errors of a current sensor and to improve the detection accuracy of currents. SOLUTION: The current sensor 13 measures a charging current and a discharging current of a battery pack 11. A CPU 17 calculates an offset error of the current sensor 13, based on a capacity difference between a battery capacity found from an accumulated value of the current measured by the current sensor 13 and a battery capacity found from an open circuit voltage of the battery pack 11, and also calculates a gain error of the current sensor 13, based on a corrected capacity difference as a difference between a corrected battery capacity, found by correcting the accumulated value of the current measured by the current sensor 13 with accumulation due to the offset errors and the battery capacity found from the open circuit voltage. COPYRIGHT: (C)2005,JPO&NCIPI
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