Battery remaining capacity estimation method, battery remaining capacity estimation apparatus, and battery power supply system

摘要

In the method for estimating battery residual capacity of the present invention, the voltage measurement values are obtained (step S 2 ). And once it is finished, using the initial values of the coefficients set at the step S 3 as starting, the optimization is progressed with renewing each value of the coefficients on the following iterating calculations (step S 4 ). Once the optimum value of each coefficient in the approximation is determined at the step S 4 , the stable open circuit voltage is calculated by the optimized reciprocal function using thereof at the step S 5 . And then based thereon, the battery residual capacity is calculated by the predetermined conversion method (step S 6 ).