|Cheung, Yau Kuen
|Numerical investigation on the effect of cell spacing on phase change material based battery thermal management system
|Huang, Xinyan (BEEE)
|Lithium ion batteries
Electric batteries -- Design and construction
Storage batteries -- Design and construction
Hong Kong Polytechnic University -- Dissertations
|Department of Building Environment and Energy Engineering
|vi, 71 pages : color illustrations
|Lithium-ion batteries have gained popularity in recent years due to their excellent performance. However, many cases of Li-ion battery have been reported in the past years that reflect the poor thermal stability of the Li-ion battery. Fire safety of Li-ion batteries has been a major concern upon further development and broader application. Even though there was existing research about improvements on different battery thermal management systems (BTMS), little research was found investigating the effect of cell spacing on phase change material (PCM) based BTMS. In this thesis, effect on cell spacing is studied through model simulation. Results suggested that cell spacing of 4 mm with minimal convective heat exchange coefficient of 5 W/m2-K could provide the lowest temperature difference at 2°C while maintaining the maximum temperature at about 41°C under 3C fast discharging, which is satisfactory. Such spacing arrangement also provided a buffer for any unusual heat release rate from the battery in case of any unexpected fault of the battery pack. This cell spacing can also handle any charge rate at or below 3C. This research investigated the effect of different cell spacing in the uniform arrangement in PCM-based BTMS and helped understand the impact on different convective heat exchange coefficients.
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