Abstract:

As two important factors of battery thermal management, temperature and pressure drop are of great significance to improve battery thermal performance. In order to further improve the thermal performance of the battery and to reduce the pressure drop and make the temperature distribution more uniform, a bionic four-leaf clover fin model was proposed, and the basic model was optimized based on computational fluid dynamics (CFD). The design structure of the inlet and outlet of the cold plate and the role of the size of the circular fin in the basic model were analyzed, and then the model of a four-leaf clover fin was proposed, and the influence of the optimized model's curvature and the number of fin rows was discussed. Finally, the variation trend of Nusselt number, pressure drop and comprehensive evaluation index of hydrothermal performance factor (HTPF) with Reynolds number of the 3 models was analyzed. The results show that when the radian of the four-leaf clover fin is 37.5° and the number of rows and column of the fin are 5 rows and 11 columns, the overall performance of the four-leaf clover fin is the highest, which is increased by 1.54% compared with that of the circular fin with a diameter of 4 mm; The angle of the 4 four-leaf clover fins and the optimal radius of the inner circle of the four-leaf clover are obtained by orthogonal experiment, and the overall performance of the optimization model is improved by 4.56%. With the increase of Reynolds number, the Nusselt, the pressure drop and the HTPF of liquid cooled plate are optimized by orthogonal experiment.

Key words: battery thermal management, bionic fin, heat transfer characteristics, orthogonal experiment