Numerical simulation of hybrid battery thermal management system combining of thermoelectric cooler and phase change material

In this study, a hybrid BTMS (battery thermal management system) that combines TEC (thermoelectric cooler) and PCM (phase change material) is shown. The PCM absorbs heat and occurs in phase change, which stores the heat from batteries. The TECs act as a heat pump, takes away the excess heat in the PCM through the fins, and control the temperature of the PCM below the phase transition temperature as much as possible, which can prevent it from melting completely and losing the ability to keep the battery temperature stable. By comparative analysis, the addition of PCM can obtain better temperature uniformity, the temperature difference was controlled below 6 °C, and CPCM with higher thermal conductivity was more suitable for the hybrid BTMS, at 1200 s, the maximum temperature of the model with 30% EG/RT44HC was 10.3 °C lower than that with pure RT44HC. When the fill thickness of CPCM increases, the temperature control time can be extended, but the performance of TEC will decrease. For this model, the arrangement direction of the fins should be perpendicular to the direction of the battery which has higher thermal conductivity, heat from batteries can be effectively transferred to the fins more and faster.