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The thermal behavior of lithium-ion batteries influences their safety, performance, and lifetime. This study simulates the heat generation of an 18,650 cell under natural convection, using a User-Defined Function (UDF) in ANSYS Fluent to accurately model joule losses and reaction heat. The results reveal significant thermal gradients, identifying critical areas of dissipation. The aim is to validate the UDF heat source on a single cell, before applying it to a 16-cell pack for an electric vehicle, in order to optimize the thermal management of the system, enabling more in-depth analysis of overall thermal behavior and thermal management strategies suitable for large-scale storage systems.

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Numerical Simulation of Heat Generation in an 18,650 Lithium-Ion Battery Cell

  • 会议论文

  • 发表日期：

    2026年

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  • Hajar El Yassini,
  • Kenza Oufaska,
  • Khalid El Yassini,
  • Rachid Bannari

摘要

The thermal behavior of lithium-ion batteries influences their safety, performance, and lifetime. This study simulates the heat generation of an 18,650 cell under natural convection, using a User-Defined Function (UDF) in ANSYS Fluent to accurately model joule losses and reaction heat. The results reveal significant thermal gradients, identifying critical areas of dissipation. The aim is to validate the UDF heat source on a single cell, before applying it to a 16-cell pack for an electric vehicle, in order to optimize the thermal management of the system, enabling more in-depth analysis of overall thermal behavior and thermal management strategies suitable for large-scale storage systems.