基于阻抗特性的动力电池系统电磁干扰仿真与测试

Electromagnetic Interference Simulation and Test of Power Battery System Based on Impedance Characteristics

摘要:

以锂离子动力电池单体为研究对象，测量不同频段下电池单体的阻抗特性以表征电池特性，并采用电气模型进行全频段阻抗特性拟合，结合电池单体及BUSBAR阻抗特性，建立整个动力电池包的电气特性模型。电驱系统是汽车上主要的电磁干扰源，在研究分析电机特性及控制策略的基础上，建立包括电驱系统在内的动力电池系统电磁干扰模型。通过仿真获取动力电池系统直流母线上的总电流变化，并与实车测试结果进行对比验证。对研究动力电池系统自身的电磁干扰及其影响机理，正确及时地发现潜在电磁干扰问题并加以解决，提高电池包系统、整车性能及增强系统运行可靠性有着重要意义。

Abstract:

By taking the lithium-ion power battery cell as the research object， the impedance characteristics of the battery cell in different frequency bands are measured to characterize the battery characteristics， and the electrical model is used to fit the impedance characteristics of the entire frequency band， and the impedance characteristics of the battery cell and BUSBAR are combined to establish the entire power. The electrical characteristics model of the battery pack. The electric drive system is the main source of electromagnetic interference in automobiles. On the basis of research and analysis of motor characteristics and control strategies， the electromagnetic interference model of the power battery system including the electric drive system is established. The total current change on the DC bus of the power battery system is obtained through simulation and compared with the actual vehicle test results. This paper is of great significance to study the electromagnetic interference and its influence mechanism of the power battery system itself， to find and solve potential electromagnetic interference problems in a timely and correct manner， and to improve the performance of the battery pack system， the vehicle and the reliability of the system.