| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating battery residual capacity, reducing a calculation load, and extremely highly accurately estimating residual capacity of a battery based on stable open circuit voltage, by highly accurately estimating the stable open circuit voltage. SOLUTION: When finishing acquisition of a voltage measurement value (Step S2), optimization is progressed renewing each value of coefficients in the following iterating calculations (Step S4) with an initial value of the coefficients set at Step S3 as a start point. Once an optimum value of each coefficient in the approximation is determined at the Step S4, the stable open circuit voltage is calculated by the optimized reciprocal function using the optimal value at the Step S5. And then based thereon, the battery residual capacity is calculated by the predetermined conversion method (Step S6). COPYRIGHT: (C)2009,JPO&INPIT
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