- Title:
- Performance Optimization of Air-Cooled Lithium Battery Pack Thermal Management Systerm with Turbulence Structure
- Keywords:
- Lithium battery; turbulent structure; thermal management; inlet wind speed; temperature difference
- CLC:
- TK124 U463.1
- DOI:
- 10. 13705 / j. issn. 1671-6833. 2025. 01. 002
- Abstract:
-
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 under an inlet air velocity of 2 m / s, the maximum temperature differences 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 decrease of 0. 60 ℃ in the maximum temperature difference. When the inlet air velocity exceeded 4 m / s, the maximum temperature difference was below 5 ℃ , meeting the optimal discharge efficiency of lithium batteries. The battery 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. Furthermore, the inlet air velocity was positively correlated with the cooling performance of the battery pack. The optimal cooling effect was achieved when the inlet air velocity reached 6 m / s, after which the change in cooling performance diminished with further increases in inlet air velocity. In conclusion, the designed 18650 lithium battery pack demonstrated optimal flow disturbance cooling performance under symmetric layout spacing, and controlling the inlet air velocity above 4 m / s enabled the battery to operate at optimal discharge efficiency.
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