Soc estimation device

Abstract

In SOC estimation device, the first estimation unit 36 estimates a reference value of SOC of the battery based on the voltage of the chargeable/dischargeable battery (auxiliary battery). The second estimation unit 38 estimates the estimated value of SOC of the battery based on the estimated reference value and the integrated value of the current of the battery. When the first estimation unit is not performing the process of estimating the reference value, the voltage of the battery is controlled within the first range. When the first estimation unit is executing the process of estimating the reference value, the voltage of the battery is controlled within the second range, and the second range includes a specific range outside the first range. The first estimation unit estimates the reference value based on the voltage of the battery when the value falls within the specific range.

Dependencies are inferred from the claim text.