A Better Way to Cool Electric Vehicle Batteries: A Computer Simulation Study

What is it about?

This capstone project explores how to effectively cool lithium-ion batteries used in electric vehicles (EVs) through a specially designed multi-inlet air cooling system. As EV usage increases, managing battery temperature becomes critical for performance, safety, and lifespan. When batteries overheat, they can lose efficiency or even catch fire, making thermal management a top priority. The study focuses on using Computational Fluid Dynamics (CFD) to simulate and analyze the performance of a battery thermal management system (BTMS) that uses multiple air inlets to distribute airflow across the battery pack. The model includes 24 cylindrical 18650-type lithium-ion cells arranged in a grid. Air is introduced through front and side inlets and exits through outlets on the opposite side, ensuring continuous ventilation. Simulations were conducted under different ambient temperatures and airflow speeds using ANSYS Fluent software. Key performance factors like temperature distribution, heat dissipation, and uniformity of cooling across all battery cells were evaluated. Results showed that batteries in the center of the pack tend to get hotter, but the multi-inlet design helped reduce temperature differences across the cells and maintained safer operating conditions. The project concludes that a well-designed multi-inlet airflow system improves heat removal, enhances battery safety, and prolongs battery life. It also provides insights for further design optimization in real-world EV applications. Overall, the project combines thermal engineering principles with advanced simulation tools to address a real and growing challenge in the electric vehicle industry.

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Photo by Michael Fousert on Unsplash

Photo by Michael Fousert on Unsplash

Why is it important?

This study is important because lithium-ion batteries, widely used in electric vehicles (EVs), can overheat during operation, especially when used for long periods or in high-demand situations. Overheating not only reduces battery performance and lifespan but can also lead to dangerous events like fires. Traditional cooling systems often fail to cool all battery cells evenly, especially those in the center of the battery pack. This project addresses that problem by designing a multi-inlet air cooling system and testing it through computer simulations (CFD). The results show that this design improves airflow and helps maintain a more uniform temperature across all battery cells. By reducing heat build-up and balancing temperatures, the system enhances the battery’s safety, efficiency, and durability. This is vital for the growth of safe and reliable electric vehicles. Ultimately, better battery cooling helps build trust in EV technology and supports the global shift toward cleaner, more sustainable transportation.

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