METHOD AND DEVICE FOR ESTIMATING CHARGE/DISCHARGE ELECTRICITY AMOUNT OF SECONDARY CELL

摘要

When a particular selection condition is satisfied, a no-load voltage calculation section (105) calculates a no-load voltage Vsep which is a voltage piece when the current in the approximate straight line obtained by statistical processing is zero for a plurality of set data consisting of current data I(n) and voltage data V(n). Moreover, when a particular current condition is satisfied continuously for a certain time, a release voltage calculation section (106) calculates the terminal voltage of the secondary cell as a release voltage Voc. By using a preset voltage change amount adjustment constant DeltaVbc, an adjustment coefficient Kb, an electromotive force change constant Keq, and a polarization voltage generation constant Kpol, an estimated charge/discharge electricity amount calculation section (114) calculates an estimated charge/discharge electricity amount DeltaQe as a function of a no-load voltage in a predetermined period or a release voltage change amount DeltaVb.