سهيل سعيدي پور

Transportation systems are among the largest sources of environmental pollution. Electric vehicles have been developed as alternatives to fossil fuel-powered cars and can help reduce pollution by using clean energy sources. The main challenge in developing electric vehicles is the energy storage system. Lithium-ion batteries have gained the most attention among the various options due to their high energy density, longer lifespan, and better safety. However, these batteries require optimal thermal conditions for efficient performance; their operating temperature must be between 15℃ and 35℃, and the temperature difference should not exceed 5℃. By adopting appropriate cooling methods, the battery thermal management system in electric vehicles can provide the desired working conditions, enhance the performance and lifespan of the batteries, and reduce the environmental risks associated with climate change. This study proposes a battery thermal management system composed of phase change material (PCM) and mini-channels, focusing on safety and economic considerations, to improve thermal performance under various operating conditions, safety scenarios, and real driving cycles while minimizing energy consumption. A thermal model of the battery and PCM has been validated using experimental data. Hybrid and liquid-based systems were numerically compared under different charge/discharge rates and real driving cycles to determine their safety features, power consumption, and thermal efficiency. The results showed that the hybrid cooling method can effectively maintain temperature and temperature uniformity within the desired range, with mini-channels contributing 24% less than the liquid-based system. Additionally, hybrid cooling provides better operating conditions for the battery pack and requires 76% less pumping power than the liquid-based system. Furthermore, the performance of the proposed cooling system was studied in the event of liquid channel failure, and the results indicated that hybrid cooling could successfully keep the maximum battery temperature below 50℃ during fast charge/discharge processes. Finally, thermal performance eva‎luation under real driving conditions demonstrated the superiority of hybrid cooling in reducing peak temperature and minimizing battery temperature variations.

سيستم مديريت حرارتي باتري , مدل‌سازي عددي , مواد تغييرفازدهنده , سيستم مايع خنك , باتري ليتيوم يون

Battery thermal management system , numerical modeling , phase change materials , Liquid cooling system , lithium ion battery

Soheil Saeedipoor

Ayat Gharaghani