In this study

a 294 L high-low temperature test chamber with two power batteries in the test area is investigated. The temperature rise and heat dissipation of the batteries in the chamber at a constant temperature of 45 ℃ are simulated through CFD

and the flow field of the high-low temperature test chamber is analyzed and optimized. The results show that for the air distribution pattern on the same side as the upper air supply and lower air return

the perforated plate in the upper part of the test area is helpful in improving the uniformity of the flow field. A vortex phenomenon occurs between the two power batteries. Increasing the distance between the shelf and bottom of the test chamber and appropriately increasing the return air grille area can reduce or even eliminate this phenomenon and thereby improve the flow field uniformity. When the distance between the shelf and bottom of the inner chamber increases to 0.2 m and the height of the return air grille increases to 0.15 m

the overall inhomogeneity of the flow field in the test chamber decreases from 1.73 to 0.4

and the vortex phenomenon between the batteries disappears.