电动汽车锂电池组双层环形均衡器研究

doi:10.16180/j.cnki.issn1007-7820.2024.04.003

Abstract

Abstract:

The traditional Buck-Boost equalization circuit has long transmission path and low equalization efficiency, and the existing ring equalizer cannot fundamentally solve this problem. In view of this problem, a double-layer ring equalizer for lithium battery based on Buck-Boost and switched capacitor is proposed in this study. The equalization circuit adopts modular balancing method, and adopts Buck-Boost and switching capacitor hybrid circuit to achieve equalization in the bottom module and top module. The circuit structure is analyzed from two aspects of equalization speed and efficiency by graph theory analysis. The results show that the equalization circuit has the advantages of less energy transmission paths and high energy transmission efficiency. The simulation model of the equalization circuit is built on the MATLAB/Simulink power simulation platform. The simulation results show that the equalization speed of the double-layer ring equalizer based on Buck-Boost and switched capacitor is 46% higher than that of the single-layer ring equalizer. Additionally, an experimental prototype of four batteries is established to verify the working principle and system equalization efficiency of the ring equalization circuit. The experimental results show that the equalization efficiency of the double-layer ring equalizer is 26.78% higher than that of single-layer ring equalizer. The simulation and experimental results are consistent with the theoretical analysis, which indicates that the circuit structure is reasonable and effective.

Key words: lithium battery, ring structure, equalizer, graph theory, probability theory, two way ring type, hybrid topology, double layer structure, series battery pack

CLC Number:

TN86

HAN Xinsheng, KAN Jiarong, LING Huiying, WANG Peng, CHENG Qian. Research on Double Layer Ring Equalizer for Lithium Battery Pack of Electric Vehicle[J].Electronic Science and Technology, 2024, 37(4): 16-24.

Figures/Tables 10

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Research on Double Layer Ring Equalizer for Lithium Battery Pack of Electric Vehicle

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