A method for calculating the state of charge of a power battery

Abstract

The application discloses a power battery SOC calculation method. The power battery comprises a plurality of single cells, and the power battery SOC calculation method comprises the following steps: acquiring characteristic parameters in a battery charging and discharging cycle, wherein the characteristic parameters comprise the voltage and temperature of the single cells and the current of the branch where the single cells are located; determining a plurality of characteristic single cells according to the maximum value and the minimum value of the characteristic parameters; calculating the SOC of the characteristic single cells, and determining the SOC of the power battery according to the SOC of the characteristic single cells. According to the application, the voltage, temperature and current of the single cells in the battery charging and discharging cycle are acquired, the maximum value and the minimum value of the characteristic parameters are determined to determine a plurality of characteristic single cells, the SOC of the characteristic single cells is calculated, and the SOC of the power battery is determined according to the SOC of the characteristic single cells, so that the calculation amount of the power battery SOC can be reduced, the calculation power can be saved, and the problem of a large amount of calculation caused by a large number of single cells contained in the power battery can be avoided.

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