关键词: 电池 SOC；多模块变压器；主动均衡；电池模组；MATLAB/Simulink

Abstract: 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.

Key words: Battery SOC; Multi-module transformers; Active balancing; Battery modules; MATLAB/ Simulink