Akademik Veri Yönetim Sistemi
5. INTERNATIONAL 19 MAY INNOVATIVE SCIENTIFIC APPROACHES CONGRESS, Samsun, Türkiye, 19 Mayıs 2021
The economic and environmental disadvantages of fossil fuels increase the interest in electric
vehicles day by day. The most important problem encountered during the use of more
economical and environmental friendly electric vehicles is the overheating of the battery cells
used as a power source during operation. This causes some negativities such as loss of
capacity of the battery cells, decrease in their efficiency and risk of explosion. Ideally, it is
desired to keep the maximum cell temperature below 50oC and the temperature difference
across the battery cells below 5oC. This requires using of the effective thermal protection
methods during the operation of battery packs. In recent years, studies on passive thermal
protection systems based on the use of phase change material (PCM) as an alternative to
liquid and air-cooled active cooling systems have started to be the focus of attention.
Especially, it is important to enhance the inherent low thermal conductivity of PCMs and
using them for thermal protection of battery packs in terms of increasing system efficiency. In this study, firstly, thermally enhanced PCM/GNP composites were synthesized by adding
7% Graphene nanoparticles (GNPs) into PCM. The thermal protection performances of
natural convection, FDM and 7% GNP / FDM in a representative cylinder package (using
resistance instead of battery cell) have been experimentally compared. Thermal performance
comparisons were made in terms of the effective protection time, maximum temperature and
the maximum temperature difference criteria. In general, it has been determined that 7% GNP
/ RT-44 thermal protection is more successful at low discharge rates (2.2W and 4.4W), and
RT-44 thermal protection is more successful at higher discharge rates (6.6W and 8.8W).