ESTIMATING METHOD OF POLARIZED VOLTAGE OF SECONDARY BATTERY, ESTIMATING METHOD AND DEVICE OF RESIDUAL CAPACITY OF SECONDARY BATTERY, AS WELL AS BATTERY PACK SYSTEM

摘要

PPROBLEM TO BE SOLVED: To improve estimating accuracy of polarized voltage of a secondary battery and improve estimation accuracy of its residual capacity. PSOLUTION: The polarized voltage Vpol is obtained based on a reference table (LUT) 1081 from the amount of changes LPF (Q) of integrated capacity in which a filtering treatment has been carried out by a polarized voltage calculation part 108, a battery electromotive force Veq is obtained by subtracting the polarized voltage Vpol from an effective non-load voltage V0OK by an electromotive force calculation part 113, and the residual capacity SOC is estimated based on the reference table (LUT) 1141 from the battery electromotive force Veq by a residual capacity estimating part 114. PCOPYRIGHT: (C)2003,JPO