A Novel Active Equalization Topology for Series-Connected Lithium-ion Battery Packs

A novel non-dissipative two-stage equalization circuit topology based on the traditional buck-boost circuit is proposed to achieve balancing of series-connected lithium-ion battery packs with higher efficiency and less cost, considering the background on international energy issues and the development trend of battery balancing. Detailed illustration of the presented topology is covered and the operation principles and control approaches are described with visualized figures. Then, under the condition of accurate modeling of the lithiumion battery, relying on the experimental data, the simulation block is built based on MATLAB and the effectiveness of the proposed topology is verified preliminarily. What's more, the results of the simulation are indicated and the comparison between the novel topology and the traditional one is analyzed at the end.