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Investigating the performance improvement of lithium-ion battery cooling process using copper fins and phase change materials (PCMs)
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2024-04-30 , DOI: 10.1016/j.csite.2024.104473
Mohammed A. Alghassab

This study investigates utilizing phase change materials (PCMs) along with metallic fins for passive cooling of lithium-ion batteries. PCMs have low thermal conductivity, which is enhanced by incorporating copper or aluminum fins. Numerical simulations using ANSYS FLUENT's Solidification & Melting solver in an axisymmetric configuration are performed. PCM cooling outperforms air cooling, providing up to 15 °C lower maximum battery temperatures as long as PCM remains solid. The findings from the analysis of air cooling versus cooling with PCM demonstrate that the use of phase-change materials enhances battery cooling performance for a specific duration, provided that these materials do not fully liquefy. Adding fins further improves cooling for 0.2 mm thickness, 6 copper fins of 11.67 mm height give optimal performance with 8 °C lower peak temperatures than without fins. Copper fins outperform aluminum due to 60 % higher thermal conductivity but have 3X higher density. For longitudinal fins, 4 fins of 10 mm height perform better than 10 fins of 3 mm height. With high conductivity PCMs like paraffin wax (0.242 W/m.K), varying fin count has minimal impact as heat distributes rapidly. This study establishes guidelines for optimizing PCM-fin geometries and materials to maximize passive lithium-ion battery cooling performance.

中文翻译:

研究使用铜翅片和相变材料 (PCM) 的锂离子电池冷却过程的性能改进

本研究研究了利用相变材料 (PCM) 和金属翅片对锂离子电池进行被动冷却。 PCM 具有较低的导热性,通过加入铜或铝翅片可以增强导热性。使用 ANSYS FLUENT 的凝固和熔化解算器在轴对称配置中进行数值模拟。 PCM 冷却优于空气冷却,只要 PCM 保持固态,最高电池温度可降低 15 °C。对空气冷却与 PCM 冷却的分析结果表明,使用相变材料可以增强特定持续时间内的电池冷却性能,前提是这些材料不会完全液化。添加散热片可进一步改善 0.2 毫米厚度的冷却效果,6 个高度为 11.67 毫米的铜散热片可提供最佳性能,峰值温度比无散热片低 8 °C。铜翅片的导热率比铝翅片高 60%,但密度却高出 3 倍。对于纵向翅片,4 个 10 毫米高的翅片比 10 个 3 毫米高的翅片性能更好。对于石蜡 (0.242 W/mK) 等高电导率 PCM,由于热量快速分布,改变翅片数量的影响最小。这项研究为优化 PCM 翅片几何形状和材料制定了指导方针,以最大限度地提高被动锂离子电池的冷却性能。
更新日期:2024-04-30
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