串联锂电池分层式主动均衡研究

Research on hierarchical active equalization of series lithium batteries

针对传统Cuk斩波电路只能对相邻电池进行均衡的缺点,设计了基于Cuk电路的分层式均衡拓扑。底层均衡电路和顶层均衡电路分别采用Cuk电路和基于电感的均衡电路,该拓扑可以减少均衡过程中能量传递的路径,减少能量损耗,加快均衡速度。顶层均衡策略采用基于电池荷电状态(SOC)以及电压的K-means聚类分析将电池分为两类,进行相应的均衡操作。Matlab/Simulink仿真结果证明,所设计的均衡拓扑和均衡策略有效提高了均衡效率和均衡速度。

Aiming at the disadvantage that the traditional Cuk chopper circuit can only equalize adjacent batteries,a hierarchical equalization topology based on the Cuk circuit is designed.The bottom-level equalization circuit and the top-level equalization circuit respectively use a Cuk circuit and an inductance-based equalization circuit.This topology can reduce the energy transfer path during the equalization process,reduce energy loss,and accelerate the equalization speed.The top-level balancing strategy uses K-means cluster analysis based on battery state of charge(SOC)and voltage to divide the batteries into two categories,and perform corresponding balancing operations.The Matlab/Simulink simulation results prove that the designed equilibrium topology and equilibrium strategy effectively improve the equilibrium efficiency and speed.