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 according to the present invention comprises: a sensing unit that detects the voltage, current, and pressure of a battery cell; a memory that stores first relationship data representing a relationship between an open circuit voltage and SOC and second relationship data representing a relationship between pressure and the SOC; and a control unit that determines a voltage value representing the detected voltage, a current value representing the detected current, and a pressure value representing the detected pressure, and determines an SOC estimate of the battery cell at each set time. The control unit compares a previous SOC estimate with a flat section, executes at least one of (i) a first SOC estimation logic based on the voltage value, the current value, and the first relationship data, and (ii) a second SOC estimation logic based on the pressure value and the second relationship data, so as to determine a current SOC estimate.

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