电动汽车动力电池主动均衡控制研究

Research on active equalization control of power batteries for electric vehicle

为尽可能避免动力电池在使用过程中出现过度充放电从而缩短使用寿命的问题,提出限流均衡和混合均衡相结合的动力电池主动均衡控制策略,建立主动均衡控制仿真模型,分别进行限流均衡、混合均衡及两种均衡策略对比的仿真分析,结果表明:提出的主动均衡控制方法能有效避免电池组不一致性问题,很好满足均衡控制要求。基于dS P ACE/AutoBox搭建主动均衡控制硬件在环实验系统,分别进行恒流充、放电与变流放电下均衡控制实验,结果表明:主动均衡控制策略在各种工况下都能快速实现电池组的均衡,且有较好的均衡效果。

In order to avoid the over-charging and over-discharging and prolong the life of power batteries as much as possible during application, the active equilibrium control strategy combined with the current limiting equilibrium and hybrid equilibrium was proposed. The active equilibrium control simulation model was established, and the current limiting equilibrium control, hybrid equilibrium control and the two control strategies were simulated and compared. The simulation results show that the proposed active equilibrium control method can effectively avoid the problem of inconsistency of the battery pack and satisfy the requirement of equilibrium control. Based on dSPACE/AutoBox system, the hardware-in-the-loop test system for active equilibrium control was established, and the constant current charging and discharging, the varied current discharging experiment was carried out. The test results show that the active equilibrium control strategy can quickly realize the equilibrium of battery pack under various working conditions, and the equilibrium effect is good.