To solve the problem of high temperatures during the operation of power batteries

a double-layer liquid-cooling plate heat-dissipation system with an I-shaped flow channel is proposed based on structural theory. The heat production model of the battery was established through charging/discharging experiments

and the computational fluid dynamics model of the liquid-cooling plate was established using FLUENT software. The effects of three structural parameters (length ratio

width ratio

and channel thickness) on the temperature and pressure drops were investigated using the orthogonal experimental design. The optimal combination of a length ratio of 0.70

width ratio of 0.85

and channel thickness of 2.5 mm was determined. In addition

the effects of different inlet velocities on the performance of liquid-cooling plates were considered. The comprehensive performances of I-shaped and serpentine channels were compared at the constraint of constant heat transfer area and inlet velocity. The results showed that with an increase in the flow rate

the maximum temperature of the liquid-cooling plate decreased 17.493 2 K

the standard deviation of the surface temperature decreased by 63.4%

and the maximum pressure increased by 726.789 Pa. The maximum temperature of the I-shaped flow channel liquid-cooling plate was 1.3330 K lower than that of the serpentine flow channel; the standard deviation of the surface temperature was 1.3865 K smaller

and the pressure drop was 24.38% lower than that of the serpentine channel.