| 摘要 |
PROBLEM TO BE SOLVED: To enhance precision for measuring an internal resistance, taking the fluctuation of a release voltage of a battery into consideration, to accurately grasp a degree of deterioration in the battery. SOLUTION: The internal resistance is calculated by linear recursion, based on data of a current I, a terminal voltage V and a temperature T of the battery 2 under charging or discharging state, in an internal resistance computing part 3b, and an increase rate of the internal resistance with respect to an initial value stored preliminarily is found to estimate the degree of deterioration in the battery, by processing statistically the increase rate of the internal resistance. When measuring the internal resistance, the precision is secured by eliminating a data impairing a linearity of a current-voltage data, using at least one out of a deviation between residual capacities SOC, SOCv calculated in a residual capacity computing part 3a and a hysteresis function Qh, as a trigger for acquiring the data, and the precision is enhanced thereby taking fluctuation of the release voltage of the battery into consideration to accurately grasp the degree of deterioration in the battery. COPYRIGHT: (C)2006,JPO&NCIPI
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