| 摘要 |
PROBLEM TO BE SOLVED: To provide a charge-rate estimation apparatus for accurately estimating a charge rate of a secondary battery during charging/discharging during which a current is being carried to the secondary battery.SOLUTION: A charge-rate estimation apparatus 39 for estimating a charge rate of a secondary battery 10, comprises: a current sensor 35 that detects a charge/discharge current; a voltage sensor 36 that detects a terminal voltage; a heat flux sensor S that detects a heat flux toward outside of the secondary battery 10; and a charge-rate estimation unit 38 that calculate a heating value of the secondary battery 10 on the basis of a detection value by the heat flux sensor S, calculates an open end voltage of the secondary battery 10 on the basis of the charge/discharge current, the terminal voltage, and the heating value, and estimates the charge rate of the secondary battery 10 on the basis of the open end voltage.SELECTED DRAWING: Figure 4 |
