电动汽车用磷酸铁锂离子电池的PNGV模型分析

PNGV model analysis of LiFePO_4 Li-ion battery for electric vehicle

以国产新型150Ah磷酸铁锂离子电池为研究对象,分别对其在0℃和30℃的PNGV模型参数进行了辨识。将其内阻参数与电池直流内阻进行对比分析,考核了磷酸铁锂离子电池的PNGV模型在FUDS工况循环下的仿真精度。研究表明:由于温度对磷酸铁锂离子电池特性的影响较为显著,PNGV等效电路模型的仿真精度会随着初始温度的变化有所波动,所以为了保证仿真效果,必须在更多的温度点上进行参数辨识并进行优化;PNGV等效电路模型适用于城市工况下的仿真。

The domestically produced new 150 Ah LiFePO4 Li-ion battery was studied, and the identification of PNGV model parameters had carried out separately at 0 ℃ and 30 ℃. The parameters of internal resistance and the battery DC internal resistance were compared and PNGV model＇ s simulation precision at FUDS drive cycle test was inspected. The research results indicate that due to the remarkable influence of temperature on LiFePO4 Li-ion battery characteristics, PNGV equivalent circuit model＇s simulation precision will fluctuate along with the initial temperature change, therefore, in order to guarantee the simulation effect, the parameters should be recognize and optimized at more temperatures. PNGV equivalent circuit model is suitable to the simulation under the urban driving cycle.