Patent ID: 7339351
Filing Date: 2008-03-04
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. A method for estimating a remaining capacity of a secondary battery, comprising the steps of: measuring data sets of a current flowing through a secondary battery and a terminal voltage of the secondary battery corresponding to the current, and obtaining a plurality of the data sets; calculating an electromotive force of the secondary battery based on the obtained plurality of data sets; determining a correction amount with respect to a current accumulation coefficient in accordance with the calculated electromotive force; calculating the current accumulation coefficient from the correction amount and a charging efficiency; multiplying the calculated current accumulation coefficient by the measured current, and estimating a remaining capacity of the secondary battery by current accumulation; and controlling the remaining capacity by charging or discharging the secondary battery using the estimated remaining capacity of the secondary battery.