Lithium-ion batteries’ safe and effective functioning depends on reliable and precise heat control. In this study, we explore the thermal behaviour of a 48-V, 30-Ah LiCoO2 battery pack utilising an unconventional transient thermal analysis technique with a simplified constant heat-generating formula based on the Bernardi equation. This work assessed the effect of several discharge rates and heat transfer coefficients on thermal performance by modelling temperature distribution and heat dissipation inside the battery pack. Heat transfer coefficients 5 W/(m2·K) for natural air convection, 10 W/(m2·K) for forced convection of air and discharge rates 0.5C, 1C, 1.5C and 2C on thermal performance were investigated using a sensitivity analysis. The results show that forced convection improves temperature distribution and considerably enhances heat dissipation at a discharge rate of 0.5C. However, the study reveals that advanced thermal management techniques are especially vital. Even forced air convection finds it difficult to maintain temperatures within the optimal range at higher discharge rates, thus emphasizing the need to optimise cooling conditions to guarantee thermal stability and prevent hotspots. The findings underline and offer insightful analysis of the relative impact of discharge rates and cooling conditions on lithium-ion battery pack thermal behaviour.
Joseph BENNY KUDIYIRICAN
,
Raja KANNAN
. Exploring the Thermal Dynamics of a 48-V 30-Ah Lithium-ion Battery Pack Through Transient Thermal Analysis[J]. Journal of Thermal Science, 2025
, 34(6)
: 2087
-2103
.
DOI: 10.1007/s11630-025-2089-2
[1] Larminie J., Lowry J., Electric vehicle technology explained. John Wiley & Sons, 2012.
[2] Enge P., Enge N., Zoepf S., Electric vehicle engineering. 1st ed. New York, McGraw Hill, 2021.
[3] Hayes J.G., Goodarzi G.A., Electric powertrain: Energy systems, power electronics and drives for hybrid, electric, and fuel cell vehicles. Wiley, 2018.
[4] Petrovic S., Battery technology crash course. Springer, 2021.
[5] Ehsani M., Gao Y., Longo S., et al., Modern electric, hybrid electric, and fuel cell vehicles. CRC Press, 2018.
[6] Miao Y., Hynan P., von Jouanne A., et al., Current Li-ion battery technologies in electric vehicles and opportunities for advancements. Energies, 2019, 12(6): 1074.
[7] Aswatdha S., Raj D.A., Rani K.U., Design of battery pack for electric vehicles. International Research Journal of Engineering and Technology (IRJET), 2019, 06(05): 7501–7504.
Available at: https://www.irjet.net/archives/V6/i5/IRJET-V6I51084.pdf.
[8] Wei L., Lu Z., Cao F., et al., A comprehensive study on thermal conductivity of the lithium-ion battery. International Journal of Energy Research, 2020, 44(12): 9466–9478.
[9] Montanari P., Hummes D., Hunt J., et al., A comparative study of different battery geometries used in electric vehicles. SSRN Electronic Journal, 2022. DOI: 10.2139/ssrn.4084408.
[10] Lin J., Liu X., Li S., et al., A review of recent progress, challenges, and perspective of battery thermal management systems. International Journal of Heat and Mass Transfer, 2021, 167: 120834.
[11] Wang X., Liu S., Zhang Y., et al., A review of the power battery thermal management system with different cooling, heating, and coupling systems. Energies, 2022, 15(6): 1963.
[12] Tete P.R., Gupta M.M., Joshi S.S., Developments in battery thermal management systems for electric vehicles: A technical review. Journal of Energy Storage, 2021, 35: 102255.
[13] Aditya M., Sikarwar B.S., Gautam S.S., Thermal management of various battery array arrangements at various environmental conditions for hybrid and electric vehicles. Journal of Physics: Conference Series, 2022, 2178(1): 012020.
[14] Hwang F.S., Confrey T., Reidy C., et al., Review of battery thermal management systems in electric vehicles. Renewable and Sustainable Energy Reviews, 2024, 192: 114171.
[15] Patil R., Punekar P., Patil R., Design, optimization, and analysis of electric vehicle battery pack. International Research Journal of Engineering and Technology (IRJET), 2022, 09(06): 525–529.
Available at: https://www.irjet.net/archives/V9/i6/IRJET-V9I687.pdf.
[16] Huang Y., Lu Y., Huang R., et al., Study on the thermal interaction and heat dissipation of cylindrical Lithium-ion battery cells. Energy Procedia, 2017, 142: 4029–4036.
[17] Spinner N.S., Mazurick R., Brandon A., et al., Analytical, numerical, and experimental determination of thermophysical properties of commercial 18650 LiCoO2 lithium-ion battery. Journal of the Electrochemical Society, 2015, 162(14): A2789.
[18] Ossila, Lithium cobalt oxide (LiCoO2) powder. Available at:
https://www.ossila.com/products/lithium-cobalt-oxide-powder. Accessed: March 21, 2024.
[19] Engineers Edge, Convective heat transfer coefficients table chart. Available at: https://www.engineersedge.com/heat_transfer/convective_heat_transfer_coefficients__13378.htm. Accessed: March 21, 2024.
