Heat Dissipation Effects of Cavity Cooling Plate with Directly Opposite Inlet and Outlet on Lithium‐Ion Battery

Abstract

Due to its high thermal sensitivity, a power lithium‐ion battery for vehicles requires an efficient cooling system to ensure safety and good performance. Excellent heat dissipation capacity enables the liquid cold plate cooling system to have better application prospects. However, all existing cold plates improve their cooling capacity by increasing the complexity of their structure. Therefore, directly opposite inlet and outlet cavity cold plate cooling systems with simple structures are established. Two kinds of cavity cold plates (Model I and Model L) with different inlet and outlet positions are analyzed using the numerical simulation method. The effects of inlet and outlet sizes, coolant mass flow rate (qm), and inlet and outlet positions on the temperature field as well as the cold plate pressure drop are studied. According to the results, maximum temperatures of batteries appear at four corners of cavity cold plates, which are lower than 35 °C. The cooling capacity and temperature uniformity of Model I cooling systems are better than those of Model L. However, the heat dissipation capacity of Model L is more sensitive to qm than that of Model I. Pressure drop of Model L is smaller. This method meets the heat dissipation of vehicle pouch lithium‐ion batteries.