Performance Optimization of Air-cooled Lithium Battery Pack Thermal Management System with Turbulence Structure
The design and simulation of a vehicle-mounted air-cooled lithium battery pack for new energy vehicles were presented. Finite element simulation was employed to analyze the thermal management system of the air-cooled lithium battery pack. The results indicated that with an inlet air velocity of 2 m/s,the maximum temperature differ-ences for the parallel and serpentine structures were 6.96 ℃ and 6.29 ℃,respectively,with a reduction in the maximum temperature difference for the serpentine structure. Introducing flow baffles to create turbulent structures reduced the maximum temperature difference to 5.69 ℃ compared to the serpentine structure,representing a de-crease of 0.60 ℃ in the maximum temperature difference. When the inlet air velocity exceeded 4 m/s,the maxi-mum temperature difference was below 5 ℃,meeting the optimal discharge efficiency of lithium batteries. The bat-tery pack exhibited optimal cooling performance when the flow baffles were arranged in a symmetric structure,with significantly lower maximum temperature and temperature differences compared to other layout arrangements. Fur-thermore,the inlet air velocity was positively correlated with the cooling performance of the battery pack. The opti-mal cooling effect was achieved when the inlet air velocity reached 6 m/s,after which the change in cooling per-formance diminished with further increases in inlet air velocity. In conclusion,the designed 18650 lithium battery pack demonstrated optimal flow disturbance cooling performance with symmetric layout spacing,and controlling the inlet air velocity above 4 m/s enabled the battery to operate at optimal discharge efficiency.
lithium batteryturbulent structurethermal managementinlet air speedtemperature difference
万方数据
维普
