| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable residual amount calculation method by eliminating maintenance and scattering of the residual amount caused by an error between a method based on a circuit voltage near a charging/discharging tail end and a method based on a current integrated value.SOLUTION: A system includes a current detection part for detecting the charging/discharging current of a secondary battery, a battery voltage detection part for detecting the battery voltage of the secondary battery, and a residual amount calculation device for calculating the residual amount of the secondary battery. The residual amount calculation device includes a first residual part calculation part for calculating the residual amount of the secondary battery from a closed circuit voltage CCV by using a relationship between an open circuit voltage OCV of the secondary battery and a charging depth SOC, and a second residual amount calculation part for calculating the residual amount of the secondary battery by integrating the charging/discharging current of the secondary battery. By eliminating an error between the residual amount calculated by the first residual amount calculation part and the residual amount calculated by the second residual amount calculation part by feedback control, maintenance and scattering of the residual amount near the end of charging or discharging is eliminated. |
