电动汽车锂电池PNGV等效电路模型与SOC估算方法

基于PNGV(the Partnership for a New Generation of Vehicles)电池等效模型,考虑了温度对模型参数的影响,提出了一种以电池等效模型的开路电压插值估算电池荷电状态(SOC)的方法。通过锂离子电池的充放电试验与HPPC试验,识别模型参数,然后使用Matlab/Simulink进行仿真计算。仿真和实验表明,所选取的PNGV模型精度高,能真实的模拟电池充放电特性,再结合开路电压插值计算电池SOC,可有效解决安时法(AH)估算SOC存在的累计误差和初始值估算不准确的问题,最终使SOC估算值控制在高精度范围内。

PNGV Equivalent Circuit Model and SOC Estimation Algorithm of Lithium Batteries for Electric Vehicle

With the model of PNGV battery,the method of SOC based on open-circuit voltage was brought forward considering the temperature effect on the parameters of the equivalent battery model.Obtained the parameters of the model by the lithium batteries charge-discharge test and HPPC test,a simulation model was set up based on Matlab/Simulink.Simulation and test result show that the PNGV model is very precise and can simulate the battery characterizations of charge and discharge as well.The cumulative error and inaccurate estimation of the initial value by the ampere-hour(AH) approach can be effectively avoided by the estimate method of SOC based on open-circuit voltage.And the estimation value of SOC can be kept highly precise.