Patent ID: 8965722
Filing Date: 2015-02-24
Classification: G01R

Abstract:
1. An apparatus for calculating a residual capacity of a secondary battery, the apparatus calculating the residual capacity of energy in the secondary battery which is charged/discharged, comprising: an arithmetic unit which estimates and calculates a first residual capacity based on a charge/discharge voltage corresponding to a residual capacity of the secondary battery, calculates a second residual capacity based on an integrated value of a charge/discharge current of the secondary battery, weights the charge/discharge voltage of the secondary battery with the first residual capacity or the second residual capacity according to the voltage changing rate, and combines the results of the weighting to obtain the residual capacity of the secondary battery; wherein in calculating the second residual capacity, the arithmetic unit integrates the charge/discharge current in terms of time, and divides the resultant value of the integration by an actual battery capacity of the secondary battery to add the resultant value of the division to the previously calculated second residual capacity.