Research on Symmetry Half-Bridge Switched Capacitor Active Equalization Circuit of Vehicle Power Lead-Acid Battery

In view of the complex battery equalization control in the traditional active equalization strategy of lead-acid batteries. In the traditional lead-acid battery active equalization strategy, the isolated drive circuit of the power switch is complicated and its stability is poor. A new equalization strategy based on half-bridge switch structure, moderate cost, easy to control, and high stability is proposed. The proposed scheme is suitable for equalization applications with a small number of battery cells, and the battery capacity is large, similar to lead acid battery. The proposed scheme is simulated and verified by Simetrix-Simplis 8.20, and the working conditions of the power battery in vehicles are analyzed and demonstrated, and the complete control strategies are developed for various working scenarios, and they are verified by experiment. The experimental results demonstrate that the proposed equalization scheme can accomplish the equalization work continuously, stably and efficiently.