Hierarchical Battery Equalizer based on Flyback Transformer Multiplexing

An effective battery equalizer is important to eliminate the inconsistency of the battery pack and improve its performance of the battery pack. As the battery equalizers generally have the problems of low equalization efficiency, slow equalization speed, and poor control of equalization energy. In this paper, a hierarchical battery equalizer based on flyback transformer multiplexing is proposed and analyzed. Flyback transformers can be used as energy storage elements for both the first and second equalization stage. The equalizer uses the multiplexing of flyback transformers to effectively reduce the size and cost of the equalizer, and the hierarchical equalization improves equalization speed and equalization efficiency. In addition, the working principle of the equalizer and the equalization control strategy are introduced in detail. Finally, the equalization of the simulation model with six single cells connected in series is verified by using MATLAB/Simulink, which proves that the equalizer has good performance.