SOC correction method and device for power battery, medium and equipment

Abstract

The invention relates to an SOC correction method and device for a power battery, a medium and equipment, and aims to correct the SOC before the charging and discharging of the power battery are cut off and ensure the smoothness of SOC change. The method comprises the steps that under the condition that a power battery contactor is closed, the SOC actual value of a power battery is obtained; an SOC display value corresponding to the SOC actual value is determined; a correction factor is determined according to the state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determiningthe SOC correction rate; and SOC correction is performed on the power battery according to the correction factor.

Description

technical field [0001] The present disclosure relates to the field of power batteries, in particular, to a SOC correction method, device, medium and equipment for a power battery. Background technique [0002] At present, the SOC (State of Charge, power battery remaining energy / state of charge) estimation of new energy vehicles is generally combined with the OCV (Open Circuit Voltage, open circuit voltage) look-up table method and the ampere-hour integration method. However, after the vehicle is left for a long time, the value obtained by the OCV look-up method will be different from the value before the vehicle sleep in the previous cycle. Therefore, after the vehicle wakes up, due to the OCV correction, the SOC will jump. . At the same time, considering the life of the battery, the display power of the power battery needs to be corrected before the end of charge or discharge to avoid overcharge or overdischarge. Therefore, SOC is generally divided into display SOC and act...

AI Technical Summary

Problems solved by technology

In related technologies, the correction strategy is generally based on the idea of ​​stage correction. For example, defining the SOC of different stages or the voltage correction rate of different single batteries is complicated, and the correction rate is not smooth enough, and it still cannot be used in vehicles or power batteries. , Realize smooth correction before discharge cut-off

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