混合动力汽车电池管理系统SOC的评价

为建立混合动力汽车电池管理系统的需要，探索镍氢电池荷电状态(SOC)的实时测量和估计方法，分析当前一般SOC定义在变电流放电情况下出现不适应的原因，和现有各种荷电状态估计方法存在的问题。为此，根据能量守恒原理，提出了一种新SOC的概念，使之能很好地适应混合动力汽车用电池在变电流状态下的实时荷电状态估计，并且基于新的SOC定义，建立电池荷电状态计算模型，进行仿真分析，简化计算，明确物理意义，提高了SOC的判断精度，减少混合动力汽车的复杂性，减少整车的成本，为混合动力汽车系统优化匹配提供了依据。

SOC Definition of Battery Management System Used in Hybrid Vehicles

For the requirement of building up the battery management system (BMS) of hybrid vehicles(HEVs), the real time measurement and estimation of charge (SOC) of the Ni MH batteries are investigated, because the popular SOC definition is unsuitable under the condition of variable current discharge. The origin of this kind unsuitability are analyzed ,and the characteristics and existing problems of different kinds of SOC measuring methods are compared. On the basis of mentioned above, some corrections are given to the popular SOC definition, and the new conception of SOC is proposed. The corrected definition of SOC is suitable for the real time SOC estimation under the variable current condition of the batteries used in HEVs. Based on the corrected SOC definition, the computational model of the new SOC is built and simulated. Satisfactory result has been obtained from comparisons of the simulating results, which shows that the theoretical model provides a basis for optimizing the adaptation of power system to the hybrid vehicles (HEVs).