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Numerical Analysis of Hybrid Thermal Management System for Lithium-Ion Batteries using Liquid Cooling Method and Phase Change Materials

Mohammadi, Mohammad Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57479 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad; Arianpour, Masoud
  7. Abstract:
  8. Lithium-ion battery is a type of rechargeable batteries that operates based on the movement of lithium ions within the battery, generating an electric current in the circuit. During charging and discharging, these batteries generate heat; therefore, it is crucial to employ an efficient battery thermal management system to maintain the temperature within a safe range. In this research, we analyze the temperature control of a battery pack comprising 168 largescale lithium-ion cells, configured as a rectangular cube with a capacity of 53 Ah, under a high discharge rate (5C). The analysis utilizes a hybrid battery thermal management system based on phase change materials (PCMs) and liquid cooling, conducted using ANSYS Fluent software. This study builds upon the work of Wang et al.. We investigated the effect of thermal buoyancy flows formed in the liquid part of the PCMs on heat transfer during battery discharge. It was demonstrated that higher temperature gradients and liquid fractions in these materials, enhance the effectiveness of these flows. For instance, in the case of a paraffin wax called RT31, the presence of buoyancy flows reduces the cell temperature by 1.4 degrees Celsius. However, in another type of paraffin wax, RT35HC, this effect is negligible. Additionally, we examined the impact of different coolants, including water, ethylene glycol, and engine oil. The results showed that water can reduce the average cell temperature by 4.5 and 7.5 degrees Celsius compared to ethylene glycol and engine oil, respectively, indicating a significant effect. However, the use of nanofluids did not show a substantial impact on temperature reduction compared to the base fluids. Furthermore, we explored the effects of the flow rate and flow direction of the cooling fluid. It was found that at low flow rates, the flow direction and increased flow rate significantly influence heat transfer. However, as the flow rate increases, the impact of these factors diminishes
  9. Keywords:
  10. Phase Change Material (PCMs) ; Lithium Ion Batteries ; Battery Pack Thermal Management ; Numerical Simulation ; Natural Convection ; ANSYS Software

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