BATTERY RESIDUAL CAPACITANCE CALCULATION DEVICE AND BATTERY RESIDUAL CAPACITANCE CALCULATION METHOD

摘要

Provided is a residual capacity calculation apparatus for a battery, including: current detection means for detecting a charge/discharge current of the battery; voltage detection means for detecting a terminal voltage of the battery; first residual capacity calculation means for calculating a first residual capacity based on an integrated value of the charge/discharge current of the battery; second residual capacity calculation means for calculating a second residual capacity based on an open circuit voltage of the battery; blend rate setting means for determining a blend rate of the second residual capacity based on a deviation between the first residual capacity and the second residual capacity; and third residual capacity calculation means for calculating a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate, in which the blend rate setting means is configured to increase the blend rate as the deviation between the first residual capacity and the second residual capacity increases.