Abstract：In order to meet the heat dissipation requirements of the battery pack at 3 C discharge rate, a PCM foam aluminum/liquid cooling composite cooling scheme was proposed. The heat dissipation model was numerically simulated by the finite element method. The influence of porosity of PCM foam aluminum, the distance between the flow channels and the liquid flow rate on the temperature of the battery pack was analyzed by response surface methodology. The research results indicate that the porosity and liquid flow rate have significant effects on the maximum temperature of battery pack. The maximum temperature of the battery pack can be reduced by increasing the porosity and liquid flow rate, but the maximum temperature tends to be stable when the porosity and liquid flow rate are greater than 84% and 0.06 M/s respectively. Meanwhile, the flow rate also has a significant influence on the temperature difference of the battery, and the average temperature performance of the battery pack can be improved by increasing the liquid flow rate. Furthermore, when the flow rate is only 0.04 m/s, the maximum temperature of the composite cooling system is 319.0 K, which is 4 K and 4.9 K lower than that of the pure passive cooling system and pure liquid cooling system, and the temperature difference of the battery pack is only 1.8 K.
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