Method for calculating SOC (State of Charge) of power battery

The invention discloses a power battery SOC calculation method. The power battery comprises a plurality of single battery cells, and the SOC calculation method of the power battery comprises the steps that characteristic parameters in battery charging and discharging circulation are obtained, and the characteristic parameters comprise the voltage and temperature of the single battery cells and the current of branches where the single battery cells are located; determining a plurality of characteristic single battery cells according to the maximum value and the minimum value of the characteristic parameters; and calculating the SOC of the characteristic single cell, and determining the SOC of the power battery according to the SOC of the characteristic single cell. According to the embodiment of the invention, the characteristic parameters such as the voltage and the temperature of the single battery cells and the current of the branch circuit where the single battery cells are located in the charging and disc