Research on a power battery thermal management system using direct refrigerant cooling with parallel serpentine flow paths
For the thermal management system of a power battery using direct refrigerant cooling,the refrigerant flows and boils in the pipeline,and the pipeline is too long,resulting in superheated segments in the flow paths of the cold plate.These superheated segments cause the temperature difference between the battery packs and the poor temperature uniformity on the vertical side of the battery.In this paper,two cold plates with parallel serpentine flow path structures placed at the bottom of the battery pack were designed for a battery pack containing 48 square cells to improve the poor temperature uniformity caused by the single serpentine flow path.This paper compares the average temperature and temperature uniformity within the flow paths of three direct-cooled plates at the end of the discharge rate of 1C of a battery pack at an initial temperature of 30℃.The maximum temperature and the temperature difference of the battery packs under these three flow path structures are compared.The temperature uniformity of the battery packs with the three flow path structures is analyzed horizontally and vertically.Adding a small surrounded cold plate in the upper layer of the battery pack should optimize the temperature difference vertically.The results show that the bottom cold plate can control the maximum temperature of the battery pack below 40℃and ensure horizontal temperature uniformity.However,the temperature difference in the vertical direction of the battery pack is too large.By adding a small cold plate on the top layer,the temperature difference in the vertical direction of the battery pack can be maintained below 5℃throughout the entire charging and discharging process,thereby fulfilling the temperature control requirements.
power batterythermal managementrefrigerant direct coolingparallel serpentine flow pathshomogeneity
万方数据
维普
