Upgrade strategy of commercial liquid-cooled battery thermal management system using electric insulating flexible composite phase change materials. (25th November 2021)

• Record Type: Journal Article
• Authors: Cao, Jiahao; Wu, Yi; Ling, Ziye; Fang, Xiaoming; Zhang, Zhengguo
• Is Part Of: Applied thermal engineering. Volume 199(2021)
• Publication Date: 2021-11-25
• Subjects: Lithium-ion battery -- Hybrid battery thermal management -- Flexible composite phase change material -- Mini-channel cold plate; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2021.117562
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Commercial cooling system is upgraded using a dielectric flexible PCM. Flexible PCM effectively improves temperature uniformity. Tests under high-rate discharge and high ambient temperature are conducted. Battery Tmax and ΔT are below 46 °C and 4 °C under charge–discharge cycles. 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.