Currently, most series battery pack balancing control strategies achieve equilibrium between individual batteries in the battery pack based on the average charge of the battery pack or on the extreme value of the charge of the battery pack. Among them, based on the equilibrium control strategy of the average charge amount, the average of the charge charge of each unit battery charge in the battery pack is calculated first, and then the unit charge charge value is compared with the calculated load charge average, and the control strategy is also to a certain extent. It is possible to achieve the equilibrium of the charge value of the battery pack, and the equilibrium control strategy based on the extreme value of the charge of the battery pack can calculate the difference between the maximum charge of the unit battery charge in the battery pack and the minimum amount of the charge, and finally realize that the difference is within the set threshold.
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