St John, R; Liu, Q; Zhang, C; Prentice, G; Gnaniah, S (2024) Effect of Moisture and Temperature on the Insulating Performance of an EV Battery Thermal Fluid. In: 2024 IEEE Transportation Electrification Conference and Expo (ITEC), 19-21 June 2024, Chicago, IL, USA.

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Abstract

As electric vehicles become increasingly popular, there is a growing emphasis on innovating their technology, evidenced by the interest surrounding novel thermal management techniques like immersion cooling. Unlike conventional thermal management methods, immersion cooling involves submerging active components directly into a thermal fluid, necessitating an insulating fluid, but it offers improved thermal management, which can offer faster charging times and longer battery life. The insulating performance of such a fluid depends on various factors, including temperature and moisture content. Therefore, it is crucial to quantify these factors accurately to provide a comprehensive understanding of their impact on fluid properties. While temperature is easily quantifiable, moisture content can be expressed in different ways, namely absolute and relative water content. The relative value is derived from the absolute and the maximum content, proving more useful than just using the absolute value, as the maximum water content can vary significantly among different fluid chemistries. With these parameters defined, a closer examination of insulating performance is possible, in this case focusing specifically on DC resistivity. Following the IEC 60247 standard, the current at different temperatures and moisture levels can be measured, and the resultant effect on the resistivity can be plotted and analysed.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Advanced Materials > Thermal Analysis of Materials
Divisions:	Materials and Mechanical Metrology
Publisher:	IEEE
Identification number/DOI:	10.1109/ITEC60657.2024.10598890
Last Modified:	15 Jun 2026 08:38
URI:	https://eprintspublications.npl.co.uk/id/eprint/10448