Balancing method for adjusting charging and discharging current between energy storage battery clusters based on voltage extreme value

The invention discloses an equalization method for adjusting charging and discharging current between energy storage battery clusters based on a voltage extreme value, which relates to the field of energy storage batteries, and comprises the following steps: S1, before charging and discharging, extracting a battery cell voltage extreme value in a cluster, and recording a battery cell number corresponding to the battery cell voltage extreme value; s2, comparing the battery cell voltage extreme value with the unit average voltage, screening the difference value between the battery cell voltage extreme value in the whole energy storage unit and the average voltage of the whole energy storage unit, and taking the maximum value of the difference value and the number of the corresponding battery cluster as the basis for subsequently adjusting the charging and discharging current of the corresponding battery cluster; s3, in the charging and discharging process of the energy storage unit, the charging and discharging