Abstract: In order to meet the heat dissipation requirements of the electric vehicle battery system, this paper designs a micro-channel cold plate structure.Fluent is used to simulate and analyze the designed cold plate, and the effects of different coolant flow rate, channel width and height on heat dissipation, average temperature and energy consumption of the plate are compared and studied. The results indicate that when the mass flow rate is 4 g/s, the maximum battery pack temperature and maximum temperature difference decrease to 28.6 ℃ and 2.1 ℃ respectively. When the mass flow rate is higher than 4 g/s, heat dissipation performance of the cool plate improves slightly and energy consumption increasese normously. The increase of channel width and height reduces thermal dissipation performance and increases energy consumption of the system, but its temperature uniformity performance improves. The arrangement of the enhanced heat transfer structure further improves the thermal dissipation performance of the liquid cooling plate, which significantly improves the temperature uniformity of the battery pack. The turbulence mechanism 3 reduces the maximum temperature and maximum temperature difference of the battery pack by 0.79 ℃ and 0.19 ℃ respectively.The conclusions provide a theoretical direction for the structural design and optimization of liquid cooling plates.