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动力电池组作为电动汽车的关键部件,对整车动力性、经济性和安全性都有重大影响。为了更合理地使用动力电池,一般需要配备电池管理系统。作为电池管理系统的关键功能之一,电池均衡可有效地改善电池系统内的单体一致性,从而提高动力蓄电池性能和寿命。通过原理分析、理论计算、仿真及实验,基于反激变压器设计了电池单体的主动均衡方案,同时基于最优线性规划设计了电池均衡策略来优化均衡效率。仿真及实验结果均表明,所设计的系统能有效地均衡电池模块内的单体,均衡效率达到72.3%,满足车载电池管理系统使用需求。
Power battery pack as a key component of electric vehicles, vehicle power, economy and safety have a significant impact. In order to use the battery more reasonably, a battery management system is generally required. As one of the key functions of a battery management system, battery balancing can effectively improve cell uniformity within a battery system, thereby improving battery performance and lifetime. Through the principle analysis, theoretical calculation, simulation and experiment, the active cell balancing scheme is designed based on the flyback transformer. Meanwhile, the cell balancing strategy is designed based on the optimal linear programming to optimize the equalization efficiency. Simulation and experimental results show that the designed system can effectively balance the cells in the battery module, and the equilibrium efficiency reaches 72.3%, which meets the requirements of the vehicle battery management system.