基于混合动力汽车车载电池SOC算法的研究

Study on an estimation method of SOC of battery in HEV

在混合动力汽车中,电池荷电状态(state of charge,SOC)是发动机和电机动力分配以及电池管理的一个重要依据。以磷酸铁锂电池为研究对象,在进行了电池各种特性实验的基础上提出了一种电池SOC的估算方法,即在安时计量法的基础上,与等效电路模型和开路电压法相结合的估算方法。利用Matlab软件建立了该算法的仿真模型,仿真结果验证了该综合估算方法的可行性和精确性。

In an HEV, SOC is an important parameter of the power distribution among the engine and the electric motor and the dynamic battery management. In this paper, LiFePO4 battery was taken as the studied subject. After some experiment about LiFePO4 battery＇s characters, a new strategy of estimating SOC was put forward with combining the Ah counting strategy, the equivalent circuit model and the open circuit voltage strategy. At last a simulation model in Matlab was created in the paper. The result of simulation indicates that the new strategy of estimating SOC is available and accurate.