48 V轻混系统动力电池热管理试验方法研究

Research on Thermal Management Test Method of Power Battery in 48 V Mild Hybrid System

为探究48 V动力电池热管理性能的有效试验方法,针对某款搭载P0级轻混系统的车型,在不同工况、环境温度、空调模式下,开展48 V电池的热管理性能影响研究试验,结果表明:采用全球轻型汽车测试循环(WLTC)工况验证48 V电池热管理性能最合适;30~50℃高温环境下连续进行5个WLTC工况循环即可有效验证48 V电池高温性能,低温-25℃环境温度下连续进行8个WLTC工况循环能够有效验证48 V电池低温性能;空调的内、外循环模式对48 V电池热平衡温度影响很大。

In order to explore an effective test method for the thermal management performance of 48 V power battery,the thermal management performance of 48 V battery was studied and tested on a vehicle equipped with P0 mild hybrid system under different test conditions,ambient temperature and air conditioning mode.The results show that the World Light Vehicle Test Cycle(WLTC)is the most suitable to verify the thermal management performance of the 48 V battery.The high tempera⁃ture performance of 48 V battery can be effectively verified by continuously performing 5 WLTC test cycles at a high tempera⁃ture of 30~50℃,the low temperature performance of 48 V battery can be effectively verified by continuously performing 8 WLTC test cycles at low temperature of-25℃.The internal and external circulation mode of the air conditioner impacts the thermal balance temperature of the 48 V battery remarkably.