Abstract

Electric vehicles (EVs) play a crucial role in reducing fuel consumption and emissions, underscoring the importance of lithium-ion batteries (Li-ion) in powering these vehicles. However, Li-ion batteries are susceptible to degradation, capacity loss, and catastrophic failure due to temperature fluctuations, necessitating efficient thermal management. This review explores advancements and challenges in PCM-based battery thermal management systems (BTMS), focusing on internal and external factors influencing performance. It discusses internal factors such as material-level improvements in PCM-based BTMS, including solutions like SiC and EG-based PCM, flexible composite PCM, and serpentine-shaped PCM. External factors, such as fluid flow dynamics, cell spacing, and shape, significantly influence BTMS performance. Critical considerations include evaluating air- and liquid-based approaches and integrating heat pipes with PCM for passive BTMS. Furthermore, understanding the influence of these factors on temperature uniformity and heat dissipation is essential. The paper concludes by outlining future trends in PCM-based battery thermal management, emphasizing the utilization of flexible PCM and copper foam-enhanced PCM alongside hybrid BTMS configurations to optimize performance. By comprehensively addressing internal and external factors, BTMS can enhance Li-ion battery efficiency and lifespan in EVs.

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