磷酸铁锂电池老化分析及模型搭建

Analysis and simulation of LiFePO_4 battery considering deterioration

为了对电动汽车动力电池进行精确建模,对磷酸铁锂电池进行了循环寿命测试及混合脉冲功率特性测试。通过循环寿命测试的结果分析,研究了电池老化对电池开路电压、电池内阻等参数的影响。结合混合脉冲功率特性测试的结果,在Simulink上搭建了电池的仿真模型。仿真结果表明,该模型精度较高,能够很好体现电池特性。

The parameters of battery system for electric vehicles are deteriorating with multiple charging and discharging behavior. An improved PNGV model which could reflect battery deterioration was proposed. In order to accurately model electric vehicle batteries, cycle life test and hybrid pulse power characteristic test had to be performed. Based on the experimental data of the cycle life test, battery deterioration effects on open circuit voltage, internal resistance and other parameters were analyzed. The proposed model was validated using Matlab/Simulink. Simulation results compared to the experimental data show the efficiency and accuracy of the proposed model.