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Optimization of Multi-Layered PCM Arrangement for Battery 18650 Thermal Management

Pakravan, Shayan | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55924 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Aryanpour, Masoud; Shafie, Mohammad Behshad
  7. Abstract:
  8. Lithium-ion batteries have the ability to store a significant amount of energy and work at high power, which has led to the wide spread of their use in various industries. In high-power applications, battery heat management increases lifespan, safety, and reduces battery power loss. In this study, the heat management of a very common and widely used 18650 battery using multi-layered phase change material has been investigated. The reason for using multiple layers is that each phase change material has its own weaknesses in addition to its advantages. It is expected that with the proper use of several phase change materials in the thermal management system, the materials will reduce the effect of each other's weaknesses, and their proper combination will have a better performance than the exclusive use of each one. In this thesis, to identify the cases where a multi-layer composition works better, suitable thermal equivalent circuits have been developed in order to find the temperature in both steady and transient conditions on the surface of the battery and different parts of the phase change material. The accuracy of the equivalent circuit results is validated by comparing them with the finite element simulation results. The results of the thermal equivalent circuit show that in the working time and temperature range of the battery, in some cases, a thermal management system made of two layers of phase change materials performs better than a single layered phase change material. The achievement of this research is that, with the properties of several phase change materials and the working characteristics of the battery and ambient air, it is easy to check which one-layered or multi-layered case of phase change materials can be used to make a suitable thermal management system for the 18650 battery
  9. Keywords:
  10. Heat Management ; Battery Pack Thermal Management ; Heat Transfer ; Lithium Batteries ; Thermal Energy Storage ; Thermal Equivalent Circuit ; 18650 Battery ; Phase Change Material (PCMs) ; Multi-Layered Phase Change Material

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