混合动力汽车电池管理系统的均衡策略研究

Research on Equilibrium Strategy of Hybrid Electric Vehicle Battery Management System

电池组的均衡技术是电池管理系统(BMS)的最关键技术之一。均衡技术可以大大减小电池组中各单体电池之间的差异,有效防止过充电和过放电,维持电池组的平衡,从而延长电池组的使用寿命,也极大地提高电池的使用效率。首先选择了电池均衡的判断标准,列举了无损和有损均衡的利弊,并着重分析了基于电感、电容、变压器等无损均衡方案,选择基于变压器的无损均衡,设计均衡电路与均衡控制策略,通过试验论证方案可行性,极大改善电池组各单体电池的不一致性。

Battery pack equalization technology is management system （BMS）. Equalization technique one of the most critical technologies in battery can greatly reduce the difference between each single battery in the battery, effectively prevent overcharge and overdischarge, maintain battery balance, thereby prolonging the service life of the battery, and also greatly improve the use efficiency of the battery. This paper first selects the standard for battery equalization, enumerates the advantages and disadvantages of lossless balance and loss balance, and emphatically analyzes the inductance and capacitance, transformer and other lossless equalization scheme based on lossless transformer. Based on equi- librium selection, equalization circuit and balanced control strategy is designed, which is proved feasible, greatly improved the inconsistency between single cells of the battery group.