Design And Thermal Performance Analysis For Liquid Cooling Structure Of Lithium-ion Battery

With the increasingly serious energy and environmental issues, electric vehicles have been developed rapidly in recent years. Battery is the power source of electric vehicles, which performance is closely related to temperature. The operation temperature of battery should be controlled strictly. Abnormal Temperature will have a huge impact on the performance and life of battery, even thermal runaway may be occurred. So the cooling performance analyze of battery pack has high research value.The paper studies on the battery pack liquid cooling structure. Battery type is selected by analyzing the characteristics of each cathode material of lithium battery and advantages and disadvantage of different structure of the battery. Heat characteristics and heat formula of lithium batteries is analyzed on the base of operation principle of the LFP battery.Secondly, according to the three-dimensional rectangular battery cooling model, the thermal parameters of lithium monomer is confirmed by calculation and experiment. Then the temperature characteristics of power battery cell is analyzed by CFD at different discharge rates to verify the accuracy of the three-dimensional model of the battery cell comparing to experiment. The battery pack is designed on structure and cooling method. The design goals of battery thermal management is came up with after the impact analyze of temperature and battery’s inconsistencies on battery life.Finally, the battery cooling structure is designed according to the advantages and disadvantages of different cooling structures and different battery cooling methods. Next, the thermal performance structure of the liquid cooling structure is analyzed by CFD and modified structure is put forward according to the result. The cooling performance of the liquid cooling structure is improved obviously after the structure changes. Then, the influence to the thermal performance of the liquid cooling structure by coolant temperature and coolant flow rate is obtained after the temperature distribution analyze on battery at different coolant flow and cooling temperature.