A battery charging and discharging current limiting and SOC correction combined control method and device

Abstract

The application discloses a battery charging and discharging current limiting and SOC correction combined control method and device, determines an SOC confidence degree, the SOC confidence degree is used for representing the degree of deviation of a current SOC estimated value from an SOC true value; determines an actual working condition of a real vehicle; matches the actual working condition of the real vehicle with a preset working condition interval, the preset working condition interval is obtained through battery calibration test; when the SOC confidence degree is lower than a confidence degree threshold value and the actual working condition of the real vehicle is within the preset working condition interval, the charging and discharging current of the battery is regulated and controlled based on a closed-loop PI regulator, and the current SOC estimated value is corrected based on an SOC correction target value corresponding to the actual working condition of the real vehicle. The application improves the SOC correction accuracy at the end of battery discharging under the working condition of the real vehicle and the probability of successful correction, and simultaneously reduces the risk of SOC false correction.

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