基于双向半桥CLLLC谐振变换器的锂电池均衡电路  

Lithium-Ion Battery Equalization Circuit Based on Bidirectional Half-Bridge CLLLC Resonant Converter

作　　者：蔡瑞佳 马运东[1] 王鹏飞 王鹏[1] Cai Ruijia;Ma Yundong;Wang Pengfei;Wang Peng(College of Automation Nanjing University of Aeronautics and Astronautics,Nanjing 211106 China)

机构地区：[1]南京航空航天大学自动化学院,南京211106

出　　处：《电工技术学报》2024年第15期4868-4882,共15页Transactions of China Electrotechnical Society

摘　　要：锂电池因其能量密度高、自放电率低等优点被广泛应用于新能源领域。由于每个电池单体容量不尽相同,在使用时往往伴随着电池过充、过放等问题,电池使用寿命将受到极大影响,严重时甚至会出现自燃、爆炸等安全问题。该文提出基于双向半桥CLLLC谐振变换器的锂电池均衡电路,通过其在不同工作状态下的四种工作路径,可实现任意电池单体间的容量均衡。搭建一套6个电池单体的均衡电路,根据实验结果验证了所提基于双向半桥CLLLC谐振变换器的锂电池均衡电路具有均衡路径灵活、均衡速度快、均衡效率高和绕组数量减半等优点。Lithium batteries are widely used in the new energy sector due to their high energy density and low self-discharge rate.As the capacity of each battery unit is different,overcharging and over-discharging greatly affect the battery life.This paper focuses on the safety of series lithium batteries.Firstly,the existing series of lithium battery equalization circuits are summarized,and the advantages and disadvantages of different circuits are analyzed.Regarding the disadvantages of multi-winding transformer-type equalization circuits,this paper proposes a Lithium-ion battery equalization circuit based on a bidirectional half-bridge CLLLC resonant converter.Secondly,the working principle and mode of the bidirectional half-bridge CLLLC resonant converter are explained,and its resonance and gain characteristics are analyzed using fundamental analysis.In addition,a control method for synchronous rectification of the secondary side of the half-bridge CLLLC resonant converter is proposed.Then,for the proposed Lithium-ion battery equalization circuit,the operating principles of its four equalization paths are analyzed,and the equalization current expressions for each path are derived.The parameter design method of the equalization circuit is given according to the analysis of the bidirectional half-bridge CLLLC resonant converter.Based on the four equalization paths of the equalization circuit and the different purposes of dynamic and static equalization,two equalization strategies are proposed.Finally,the relevant hardware parameters of the equalization circuit are designed,and the device selection is carried out.The fabrication method of the magnetic components is also given.A set of equalization circuits for six battery cells is built.The equalization path and the soft circuit switching are verified by simulation and experiment.According to the proposed control strategy,static equalization and dynamic equalization are carried out for six battery cells.The experimental results show that the proposed equalization circuit

关 键 词：电池均衡 双向半桥 CLLLC谐振变换器 模糊控制 多绕组变压器 

分 类 号：TM912[电气工程—电力电子与电力传动]