Encapsulation of phase change materials with nano carbon spheres and investigation of their potential for battery thermal management systems

Following the increase in the methods of obtaining energy, many problems have come to light. One of these problems is the efficient use of the energy obtained. In this context, battery systems are designed to increase the efficiency of energy and ensure its effective use. With the commercial use of the battery, the efficiency of the energy obtained increases in areas such as portable tools, electric vehicles and industry. In battery systems, the most widely used battery type in commercial areas is Lithium-Ion batteries. The high energy density, long cycle life, low maintenance, low cost, low weight and less self-discharge of LIB batteries pave the way for them to be preferred in battery systems. However, there are factors that may affect the use of battery packs. One of these factors is thermal runaway formation. The use of the battery pack outside the optimum temperature values reduces the life of the battery and causes thermal leakage when it reaches high temperatures. BTYS was developed to provide solutions to the causes of thermal leakage of the battery pack. BTYS includes battery cooling systems that will increase the life and efficiency of the battery. These cooling systems are designed as liquid cooling, air cooling, heat pipe cooling and FDM cooling systems. In recent studies, the FDM cooling system exhibits superior properties compared to conventional cooling systems. In the selection of FDM, paraffin RT35HC with a phase change temperature of 35°C was selected considering its compatibility with the battery pack and its superior properties. In this study, the high thermal conductivity of carbon and its porous volume in sizes suitable for the FDM encapsulation process are the superior reasons for its preference. Carbon nanospheres were synthesized and characterization showed that they were 20 nm in size and had a high surface area. The high surface area increases the efficiency by using low amounts of carbon and high amounts of FDM after the encapsulation process of carbon nanospheres. In this context, encapsulation process was carried out using 30% carbon and 70% FDM ratios. In this thesis, composite FDM was designed by using FDM encapsulation method into hollow carbon nanospheres. Characterization analysis of the designed composite FDM was carried out