增程式电动汽车用锂离子动力电池试验研究

Experimental Research on Lithium-ion Power Battery for Extended Range Electric Vehicle

增程式电动汽车车载锂离子动力电池的电性能直接影响整车的使用性能。为研究锂离子电池单体的充放电性能、标定开路电压曲线及不同静置时间对极化消除的影响,以INR18650-33G电芯为例,并以某款车载锂离子电池系统为试验对象,研究了锂离子电池系统的充放电特性。试验结果表明,INR18650-33G电芯具有良好的一致性,但充、放电1 h后极化现象仍不能完全消除,放电极化现象比充电极化严重;单体的一致性和系统的散热性能对整个动力电池系统的电性能有重要影响。

Electrical properties of lithium- ion battery for extended range electric vehicle（EREV） directly affect vehicle performance. In order to study the impact of charge and discharge performance of lithium- ion battery cells,calibration OCV（open circuit voltage） curve and different standing time on the elimination of polarization, we take INR18650-33 G battery cell as the example and an on-board lithium-ion battery system as research object to investigate the charge and discharge characteristic of the lithium-ion battery system. The results show that： INR18650-33 G batteries have good consistency, whereas the polarization phenomenon can not be eliminated completely after 1h of charge and discharge, and the discharge polarization is more serious than the charge polarization; monomer consistency and heat dissipation of the system affect electrical performance of the battery power system significantly.