单体参数差异对串联电池组性能影响研究  

Influence of cell parameter differences upon series battery packs

作　　者：陈强[1] 李香龙[2] 李雪[3] 张彩萍[3] 

机构地区：[1]国网北京市电力公司,北京100031 [2]国网北京市电力公司电力科学研究院,北京100075 [3]北京交通大学,北京100044

出　　处：《电源技术》2013年第11期1947-1950,共4页Chinese Journal of Power Sources

基　　金：北京市科委项目(Z111100056011014)

摘　　要：纯电动车车载锂离子动力电池均是成组应用,放电过程中,电池单体之间存在的欧姆电阻差异、容量差异、极化差异,使电池单体表现为不同时到达电池端电压下限,导致电池单体容量不能全部放出,不能发挥电池最大储能效果。以北京奥运会纯电动公交车淘汰的额定容量90 Ah锰酸锂电池为研究对象,在MATLAB/SIMULINK里对电池单体串联成组的放电过程建模,通过不同倍率和DST工况下实验数据与仿真数据的对比分析,验证了模型的准确性。分别对欧姆内阻差异、容量差异、极化差异下的串联电池组的实际容量利用效率和能量利用效率进行了理论推导,并在不同电流倍率和DST工况下,对电池串联成组后从SOC为100%放电到SOC为0进行仿真验证。仿真结果表明,容量差异对串联电池组性能影响最大。Lithium ion power batteries for pure electric vehicles are used in group mode. In the discharge process, the difference of ohmic resistance, capacity and polarization between battery cells makes the battery cells arrive to the lower limit of battery terminal voltage in different time. So, the whole capacity of battery cells can not be released, which influences the battery energy storage. 90 Ah LiMn204 was taken as the study object, which was eliminated from the Beijing Olympic Games pure electric bus. A model was established by MATLAB/SIMULINK to simulate the discharge progress of series battery packs. By comparing with the experimental data and simulation data of different current magnifications and DST conditions, the accuracy of the model was verified. Under different conditions, for examples, the difference of ohmic resistance, capacity, and polarization, the utilization efficiency of capacity and energy of series battery packs was deduced. And under the different current magnifications and DST conditions, the discharge progress from SOC=I to SOC--O was simulated. Simulation results show that the difference of capacity of sedes battery packs performance accounts for the largest proportion.

关 键 词：锂离子电池 参数辨识 串联 容量利用率 能量利用率 

分 类 号：TM912[电气工程—电力电子与电力传动]