Lithium-ion batteries generate a lot of heat during discharge, which can cause the risk of excessive temperature and accelerate the capacity fading rate. Cooling the battery through the latent heat storage of hydrated salt is a good choice. In this study, hydrated salts mixed with sodium acetate trihydrate and disodium hydrogen phosphate dodecahydrate were modified to change the phase change temperature and enthalpy, and then the battery cooling modules were prepared by using modified composite phase change material as a filler and copper foam as a support matrix. The thermal performance of the modified composite phase change material was tested and analyzed by differential scanning calorimetry (DSC) test. The DSC analysis showed that the composite phase change material with 5wt% sodium acetate trihydrate had the best performance, the enthalpy was 278.9 kJ/kg and its phase change temperature was 46.9 ℃. The results of the surface temperature measurement experiments of the cooling module on the battery showed that the cooling module can effectively reduce the temperature in the discharge process and the maximum temperature reduction can be up to 9 ℃. The lowest temperature was 55 ℃ with the battery cooling module on the discharge at 1.5C.
Keywords hydrated salts, phase change material, battery cooling modules, Lithium-ion battery