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Passive Battery Thermal Management via Complex Fluids and Air in The Presence of Gravitational Vibration

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Title: Passive Battery Thermal Management via Complex Fluids and Air in The Presence of Gravitational Vibration
Author: Hajiyan, Mohammadhossein
Department: School of Engineering
Program: Engineering
Advisor: Abdullah, HusseinMahmud, ShohelMohammad, Biglar Begian
Abstract: The effective supply of energy, both at the local and global levels, is vital to 21st-century life. However, despite recent improvements in energy technologies, many energy supply challenges remain; for example, energy shortages and the environmental pollution associated with some energy generation. Increasingly, though, chemical and electrochemical batteries are replacing gas- and oil-based energy sources in a number of applications. In order to increase the cycle life and power performance of the battery, it is important to have an efficient cooling system for almost all types of batteries during their operation. In this study, recent research on cooling systems for batteries are reviewed and passive cooling methods of the LIBs are examined. Foremost, a characterization along with the thermophysical properties measurement of MNF were implemented followed by detailed investigation on natural convection of MNF at different applied magnetic fields (B), temperature (T) and volume fraction of nanoparticles (φ). Subsequently, an analytical model is developed from the obtained experimental data to accurately predict thermal conductivity of the working fluid (glycerol+Fe3O4) as a function of applied magnetic field, temperature and volume fraction of nanoparticles. Additionally, the application of magnetic nanofluid (MNF) in the passive thermal management of LI-18650 batteries was studied and is found to be beneficial for heat transfer enhancement. In particular, the experimental and numerical results for MNF application in passive BTM showed that the application of a magnetic field perpendicular to the temperature gradient successfully improves the heat transfer rate within the MNF. Moreover, the influence of gravitational vibrations, at different amplitudes and frequencies, on the passive air cooling of the LI-18650 cell under constant discharge rate was studied numerically. These numerical results showed that an increase in the Strouhal number (Sr) increases the magnitude of velocity and disrupts symmetrical flow structures of velocity. Also, it was seen that the Nusselt number (Nu) was not significantly affected by changes in the frequency of vibration at lower amplitudes. Finally, this study finds that the dimensionless heat transfer rate, Nu, was affected significantly when vibration is within the resonant vibration range (110 < ω <900).
Date: 2020-05-20
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Embargoed Until: 2021-05-12

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