某锂电池模组不同工况放电性能研究

Research on Discharge Performance of a Lithium Battery Module under Several Working Conditions

某锂电池模组以不同工况进行放电测试,通过测量放电过程中温度变化及放电容量,对该锂电池模组不同倍率、不同功率下的放电性能进行研究。结果发现:该锂电池模组3 C放电最高温度达到63.1℃,0.2C放电最高温度31.7℃,3 C放电容量为0.2 C放电容量的97.3%,表明随着放电倍率的增大,电池模组的温度上升,放电容量下降;该锂电池模组5000 W放电最高温度达到56.3℃,500 W放电最高温度30℃,5000 W放电容量为500 W放电容量98.4%,表明随着放电功率的增大电池模组的放电容量下降。说明,锂电池以不同倍率、不同功率放电会产生不同温度,不同的温度对锂电池放电性能有重要影响。因此维持在合理的工作温度对锂电池放电性能很关键,本文通过锂电池模组不同工况放电性能研究,为该电池模组后期装备热管理设计提供试验支撑。

Discharge tests of a lithium battery module are carried under several working conditions.By measuring the temperature and discharge capacity during the discharge process,the discharge performances of the module at different rates and different powers are studied.The results show that the highest discharge temperatures discharge can reach 63.1℃under 3C or 31.7℃under 0.2 C and the discharge capacity under 3 C is 97.3%of that under 0.2 C.The temperature of the battery module should increase and the discharge capacity decrease with the increase of discharge rate.The highest temperatures reach 56.3℃or 30℃respectively under constant power discharge at 5000 W or 500 W,and the discharge capacity under 5000 W is 98.4%of that under 500 W.The discharge capacity of the battery module decreases with the increase of the discharge power.Meacwhile,the tests show that the lithium battery module discharges at different rates and powers will result in different temperatures,and in turn,the different temperatures have significant effects on the discharge performance of the module.Therefore,it is concluded that maintaining a reasonable working temperature is very important for the discharge performance of lithium battery molule.Finally,the above results could be an experimental support for the following thermal management design of the battery module.