磷酸铁锂锂离子电池用可变参数PNGV模型

PNGV model based on variable parameter for lithium iron phosphate Li-ion battery

提出一种可变参数新一代汽车合作伙伴计划(PNGV)等效电路模型,结合锂离子电池的荷电状态(SOC),将欧姆电阻、极化电阻和极化电容等设置为随SOC变化的动态参数。采用混合动力脉冲功率特性(HPPC)测试分析磷酸铁锂锂离子电池,利用最小二乘法进行参数辨识。通过MATLAB/SIMULINK搭建仿真模型,发现基于可变参数的PNGV模型,平均误差为8.68 m V,相对于传统PNGV模型的17.76 m V更能体现锂离子电池的使用特性。

A partnership for a new generation of vehicles(PNGV)equivalent circuit model based on variable parameter was proposed.Combining with the state of charge(SOC)in the Li-ion battery,the Ohmic resistance,polarization resistance and polarization capacitance were set as dynamic parameters changed with SOC.The lithium iron phosphate Li-ion battery was analyzed by hybrid pulse power characteristic(HPPC)test.The least square method was used for parameter identification.The simulation model was built by MATLAB/SIMULINK.It was found that the average error of the PNGV model based on the variable parameter was 8.68 mV,compared with the 17.76 mV of the traditional PNGV model,it could reflect the characteristics of Li-ion battery better.