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Numerical Analysis of Innovative Systems for Thermal Management of Li-Ion Batteries Using Phase Change Materials

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Abstract:

This work numerically studies the thermal management of a Li-ion battery pack using Phase Change Materials (PCMs) with two different modelling approaches. Specifically, the results obtained with the Enthalpy-Porosity method, implemented in the tool STAR-CCM+, are compared with those yielded by the Apparent Heat Capacity formulation, employed by COMSOL Multiphysics. Both models are first validated against benchmark cases found in the literature. The study then focuses on the thermal behaviour of a battery pack composed of four 21700 Li-ion battery cells, cooled using the paraffinic PCM RT35. The numerical results show that, while natural convection in the liquid PCM accelerates the melting process, it leads to a non-uniform temperature distribution, particularly disadvantageous for cells located in the upper part of the battery pack. In addition, although both numerical approaches show good agreement between their results, especially in capturing the overall thermal behaviour, some minor differences in the temperature profiles during the PCM phase change still emerge.

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Periodical:

Defect and Diffusion Forum (Volume 445)

Pages:

267-278

DOI:

https://doi.org/10.4028/p-F9gewr

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Online since:

December 2025

Authors:

Filippo Azzini, Giulia Martino*, Claudia Naldi, Beatrice Pulvirenti

Keywords:

Conduction, Convection, Cooling, Li-Ion Batteries, Melting, Numerical Simulations, PCM

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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