Experimental study on the bottom liquid cooling thermal management system for lithium-ion battery based on multichannel flat tube

Thermal management system (TMS) plays an important role in reducing the battery module's temperature rise and ensuring temperature uniformity. In this study, a bottom liquid cooling (BLC) TMS based on multichannel flat tube (MCFT) is established. The temperature distribution of the battery module under the BLC method is analyzed through comparative experiments with the passive cooling method. Then, the influence of cold water flow rate and cold water inlet temperature variation on thermal management performance are studied. Results show that the BLC TMS based on MCFT can effectively reduce the temperature rise of the battery module without considerably reducing the temperature uniformity of the module. The increase in the cold water flow rate slightly influences the thermal management performance of the battery module, the change in the module's maximum temperature is only 1.4%. However, the change in the cold water inlet temperature considerably influences the thermal management performance of the battery module. The temperature of the battery module can be maintained below 45 degrees C by decreasing the cold water inlet temperature, but the temperature difference of the battery and module levels are increased by 48.9% and 61.6%, respectively.