| 摘要 |
PROBLEM TO BE SOLVED: To estimate SOC of a battery with high accuracy.SOLUTION: A power storage system is mounted on a vehicle with a power storage device that performs charging/discharging. The power storage system includes a controller that calculates an open circuit voltage on the basis of a closed-circuit voltage to be detected by a voltage sensor, a first voltage change value due to internal resistance in accordance with a charging/discharging current value to be detected by a current sensor, and a second voltage change value due to polarization, and calculates a charging state on the basis of OCV-SOC characteristics where correspondence relation between the open circuit voltage and the charging state of the power storage device is defined in advance. The controller calculates internal resistance of the power storage device on the basis of the charging/discharging current value and the closed-circuit voltage, calculates a first correction value corresponding to the first voltage change value in accordance with a change in internal resistance calculated for a reference value of the internal resistance of the power storage device, and a second correction value corresponding to the second voltage change value, and calculates the open circuit voltage by correcting the first voltage change value and the second voltage change value. |
