Abstract
This paper proposes a hybrid cooling system which combines a commercial bottom liquid cooling system and a novel dielectric flexible composite phase change material (FCPCM). This hybrid cooling system ensures the safety and high performance of Lithium-ion battery under abuse conditions, such as a high-rate discharge of 6C and a high ambient temperature of 40 ℃. The cooling performances of different thermal management modes are compared to demonstrate the superiority of the hybrid cooling system. The results indicated that the single bottom liquid cooling system induced a large temperature difference over 7 °C, while the temperature difference decreased to 3.2 °C with the addition of FCPCM. Then, operating conditions such as inlet temperature, inlet flow rate, discharge rate, and ambient temperature on the cooling performance are investigated. Under a high ambient temperature of 38 °C, a charge–discharge cycle test is conducted to rank the effectiveness of the hybrid cooling system during long-term operation. The temperature and temperature difference of the battery pack were below 45 °C and 4 °C, respectively, in four charge–discharge cycles.
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