基于SOC多模块变压器电池组主动均衡技术研究

Research on Active Balancing Technology of SOC Multi-module Transformer Battery Pack

针对纯电动汽车动力电池单体间以及电池模组间的均衡速率和均衡效率问题,设计电池单体串联和电池模组串联电路来研究电池单体间和电池模组间充放电时的均衡速率和均衡效率,电池单体间采用电感式和多模块变压器式的主动均衡方式,电池模组间采用多模块变压器主动均衡方式。在MATLAB/Simulink软件环境下分别搭建相应的仿真模型,以电池荷电状态(SOC)为均衡控制变量,采用“均值-差值”控制策略进行仿真实验。仿真结果表明,串联电池单体采用多模块变压器均衡时间是电感式均衡时间的3倍;电池组间均衡时底层单体电池SOC通过电感式均衡快速保持一致,顶层电池模组通过变压器同时充放电,使得电池组SOC保持一致。将单体均衡采用电感式,模组采用多模块变压器式均衡应用于车载多电池箱均衡中有助于提升均衡速率和均衡效率。

Aiming at the equilibrium rate and equilibrium efficiency between battery cells and battery modules of pure electric vehicles,the series connection circuit of battery cells and battery modules is designed to study the equilibrium rate and equilibrium efficiency of charging and discharging between battery cells and battery modules,and the active balancing mode of inductive and multi-module transformer between battery cells and multi-module transformer between battery modules is adopted.In the MATLAB/Simulink software environment,the corresponding simulation models are built,and the battery state of charge(SOC)is used as the equilibrium control variable,and the"mean-difference"control strategy is used to carry out simulation experiments.The simulation results show that the equilibrium time of the series battery unit using a multi-module transformer is three times that of the inductive equalization time.When the battery pack is balanced,the underlying cell SOC is quickly consistent through inductive balancing,and the top battery module is charged and discharged simultaneously through the transformer,so that the battery pack SOC is consistent.The monomer equalization adopts inductive type and the module adopts multi-module transformer type balancing,which is applied to the balancing of vehicle multi-battery boxes,which helps to improve the equalization rate and equalization efficiency.