In this article the use of PCS (phase change slurry) as a thermal battery management option in electric vehicles was considered. Therefore, PCS investigations in terms of thermo- and fluid dynamic properties were performed. A droplet size distribution between 1 and 10 µm and a constant viscosity of about 25 mPas above share rates of 200 s-1 at 22 °C were observed. In addition, investigated PCS exhibited a three times higher heat storing capacity as water in the temperature range between 24 and 30 °C. Accordingly, a subcooling degree of only 3 K was reached due to added nucleating agents. Additionally, a thermal battery model was developed in order to estimate the battery temperature increase without thermal management. As a result, within one hour driving the determined temperature increase differed between 11 and 30 K according to the applied driving cycle. Subsequently, an application example is presented, where the PCS battery thermal management approach is implemented into the entire thermal management system of an electric vehicle. In conclusion, the requirement of a battery thermal management is demonstrated due to critical temperature increases even inside one hour of driving; moreover, PCS as a novel heat transfer medium with advantageous properties in terms of heat storing capacity is presented and an application approach is given. However, further investigation will be performed according to unknown PCS properties, such as thermal conductivity over a large temperature range and heat transfer properties. These properties are required, in order to compute battery temperature profiles during the PCS thermal management as well as passive cooling potentials through a radiator.
Battery thermal management using phase change slurries
IIR Conference on Phase Change Materials and Slurries for Refrigeration and Air Conditioning, 10 ; 1-8
2012
8 Seiten, 6 Bilder, 1 Tabelle, 10 Quellen
Conference paper
Storage medium
English
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