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Li-ion Battery Thermal Management System Utilizing Phase Change Material and Intermediate Boiling Fluid

Rahimpour, Alireza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58275 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad; Ghahremani, Amir Reza
  7. Abstract:
  8. Recent advancements in technology and the growing human demand for energy have driven researchers towards developing new methods for energy storage and transfer. Lithium-ion batteries are among the most crucial technologies used in this field, requiring heat dissipation for proper operation. When using these batteries, in addition to keeping the maximum temperature within an acceptable range, the maximum temperature difference is also important and must be considered. Given the suitable ability of phase change materials (PCMs) in controlling temperature uniformity, many researchers have explored hybrid battery cooling systems that combine PCMs with other cooling methods. In the current study, a lithium-ion battery cooling system based on paraffin as the phase change material and dichloromethane as an intermediate boiling fluid has been investigated. The proposed system includes seven 21700 lithium-ion battery cell simulators, and heat dissipation from the intermediate boiling fluid is achieved by using ambient temperature water flow. In this research, the proposed system was evaluated in both transient and steady-state conditions, and its performance was compared with two other systems. The results of this study showed that the proposed system performs better than the other two systems and is capable of satisfying the criteria of a maximum temperature of 45°C in transient state, 60°C in steady state, and a maximum temperature difference of 5°C in both states for multiple cycles with a charging current density of 2C and a discharging current density of 5C
  9. Keywords:
  10. Lithium Ion Batteries ; Phase Change Material (PCMs) ; Intermediate Boiling Fluid ; Paraffins ; Battery Thermal Management System ; Direct Contact ; Dicholoromethane

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