Battery Management System, Battery Pack, Electric Vehicle And Battery Management Method

Abstract: A battery management system, a battery pack, an electric vehicle, and a battery management method are provided. The battery management system comprises: a sensing unit which detects a terminal voltage and a charging/discharging current of a battery having a characteristic in which a voltage inflection section changes according to a current rate; a memory unit which stores a first Kalman filter using an equivalent circuit model and an SOC-OCV curve of the battery and a second Kalman filter using a constant current charging/discharging map of the battery; and a control unit which determines a first SOC estimation value by inputting, to the first Kalman filter, a voltage value of the terminal voltage, a current value of the charging/discharging current, and a previous SOC estimation value and determines a second SOC estimation value by inputting, to the second Kalman filter, the current value and the previous SOC estimation value.

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