Spiral Structure of Cylindrical Batteries and its Importance in Modeling of Heat Transfer

abstract

en

This study investigates the importance of considering the well-known spiral structure of cylindrical batteries in numerical models of heat transfer within the battery. Such models typically simplify the internal geometry by a concentric layout with electrodes and separators. This results in an effective orthotropic thermal conductivity with radial, tangential and axial components defined in a local cylindrical coordinate system. However, the actual spiral structure suggests radius-dependent thermal conductivity. Herein, several thermal simulations were performed, and thermal fields were compared with the commonly used cylindrical orthotropy and the more realistic spiral. The results show that the spiral does indeed have a negligible effect on the overall temperature distribution when realistically dense spirals are assumed, confirming the common assumption employed in the literature. Interestingly, none of the previous studies provide proof of the above assumption. Therefore, this paper can serve this purpose.

This study investigates the importance of considering the well-known spiral structure of cylindrical batteries in numerical models of heat transfer within the battery. Such models typically simplify the internal geometry by a concentric layout with electrodes and separators. This results in an effective orthotropic thermal conductivity with radial, tangential and axial components defined in a local cylindrical coordinate system. However, the actual spiral structure suggests radius-dependent thermal conductivity. Herein, several thermal simulations were performed, and thermal fields were compared with the commonly used cylindrical orthotropy and the more realistic spiral. The results show that the spiral does indeed have a negligible effect on the overall temperature distribution when realistically dense spirals are assumed, confirming the common assumption employed in the literature. Interestingly, none of the previous studies provide proof of the above assumption. Therefore, this paper can serve this purpose.

battery thermal management systems; Li-Ion cylindrical batteries; orthotropic thermal conductivity; spiral structure

21.11.2024

INTERNATIONAL ASET

978-1-990800-48-1

2563-5301

Proceedings of the 5th International Conference on Fluid Flow and Thermal Science (ICFFTS 2024)

170-1–170-1

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