Abstract: As the capacity and voltage requirements of chemical battery energy storage continue to increase, the number of series-connected battery cells continues to increase, and the problem of battery consistency is particularly prominent. In this paper, for the distributed battery equalization system, the droop control was used as the primary control of the equalization converter according to its high reliability and good redundancy. However, there is a contradiction between the output voltage deviation and the current distribution accuracy. A coordinated control strategy based on multi-agent system was used as the secondary control of the equalization converter. Each battery module only exchanges information with its neighbors through a sparse communication network, and estimates the global module voltage through voltage regulators and current regulators, effectively eliminates noise, and coordinates the equalization current commands of each module, thereby optimizing the limitations of traditional droop control. The simulation and experimental analysis of the example demonstrate the practicability and effectiveness of the cooperative control strategy proposed in this paper in battery balancing applications.