Patent ID: 8994334
Filing Date: 2015-03-31
Classification: G01R,H01M,Y02E

Abstract:
1. A battery state-of-charge calculation device, comprising: a first state-of-charge calculation unit which outputs a first state of charge calculated on the basis of voltage data; a second state-of-charge calculation unit which outputs a second state of charge calculated on the basis of current data; an impedance voltage calculation unit which calculates an impedance voltage value on the basis of an effective state of charge and the current data; a static determination unit which obtains the impedance voltage value at a predetermined cycle, thereby measuring a period of time during which the impedance voltage value is within a range identified by a predetermined threshold value, and determines that the impedance voltage value is static where a static time is equal to or longer than a predetermined time in the range identified by the predetermined threshold value and outputs the determination result; and a state-of-charge decision unit which, on the basis of the determination result, outputs the first state of charge as the effective state of charge where the impedance voltage value is static and outputs the second state of charge as the effective state of charge where the impedance voltage value is not static.