RESIDUAL CAPACITY CORRECTION METHOD OF SECONDARY BATTERY, RESIDUAL CAPACITY CALCULATION METHOD OF SECONDARY BATTERY AND PACK BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery residual capacity correction method for correcting residual capacity without showing as if a secondary battery is charged even when charge/discharge of the secondary battery is stopped, and to provide a secondary battery residual capacity calculation method and a pack battery.SOLUTION: When battery voltage of a secondary battery is reduced as shown by a thick solid line in Fig.6A by self-discharge or the like during discharge stop from time T20 to time T21, release voltage of the secondary battery detected during the discharge stop is applied to discharge characteristics indicting relation between the release voltage of the secondary battery and relative residual capacity to calculate the relative residual capacity indicated by a thin solid line in the Fig.6A and calculate second residual capacity by multiplying the calculated relative residual capacity by full charge capacity. When the second residual capacity is smaller than the residual capacity of the secondary battery calculated without considering the self-discharge or the like, the residual capacity is substituted by the second residual capacity to set the second residual capacity as residual capacity after correcting the secondary battery.