| Cooling Performance Analysis of Battery Modules Considering the Viscoelastic Behavior of Thermal Interface Materials |
| Dongwoo Kim1, Jeong-Yoon Koh1, Eongyu Choi1, Heung-Kyu Kim2, Siyoul Jang2 |
1Graduate School of Automobile and Mobility, Kookmin University, Seoul 02707, Korea
2Department of Automotive Engineering, Kookmin University, Seoul 02707, Korea |
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Received: February 21, 2025; Revised: May 6, 2025 Accepted: May 30, 2025. Published online: July 23, 2025. |
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| ABSTRACT |
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Lithium-ion batteries used in electric vehicles generate heat due to various factors, potentially leading to fire or explosion incidents. To mitigate these risks, extensive research has focused on enhancing battery module cooling performance through thermal interface materials (TIMs). These materials, however, exhibit viscoelastic mechanical properties that change over time, affecting their thermal transfer characteristics and making it challenging to accurately predict long-term cooling performance. This study aims to quantify both the viscoelastic behavior and the thermal transfer characteristics of TIMs. By employing finite-element analysis to predict the time-dependent contact pressure of TIMs within a battery module and by calculating the corresponding thermal conductance, the cooling performance of the module can be accurately assessed. The proposed method for modeling the mechanical and thermal behavior of TIMs, while accounting for their viscoelastic nature, is expected to significantly aid in the precise design of cooling systems for lithium-ion battery modules. |
| Key Words:
Thermal interface material (TIM) · Viscoelastic · Contact pressure · Thermal conductance · Battery module · Finite-element analysis (FEA) |
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Corresponding Author.
Heung-Kyu Kim , Email. 
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