ELECTRIC-POWERED VEHICLE, METHOD FOR ESTIMATING STATE OF CHARGE, AND COMPUTER-READABLE STORAGE MEDIUM HAVING PROGRAM STORED THEREIN FOR CAUSING COMPUTER TO EXECUTE METHOD FOR ESTIMATING STATE OF CHARGE

摘要

When charging each electric power storage device from a power supply external to a vehicle is requested, then before each electric power storage device is charged the electric power storage devices charge/discharge therebetween. A battery ECU calculates a voltage-current characteristic of each electric power storage device, as based on each electric power storage device's voltage and current collected when the electric power storage devices charge/discharge therebetween. Each electric power storage device's OCV is calculated as based on the calculated voltage-current characteristic, and each electric power storage device's SOC is estimated from the calculated OCV.