چكيده به لاتين
With the advent of the hybrid and electric car industry, as well as the growing use of these types of vehicles in the world, many factories and companies compete to improve the performance of their components. One of the most important components of these cars is the battery that plays the main role in electric vehicles and plays a complementary role in hybrid vehicles. Lithium-ion batteries, among other options with lower price, have a longer lifetime and better energy density, more attention has been paid. But the thermal problems associated with these batteries have been limited by their use for high energy consumption. Therefore, cooling and maintenance of this main component is of particular importance. It always tries to control this increase in temperature using different thermal management systems. In terms of life, one of the important factors in batteries is the working temperature. It is obvious that the longer the battery operates at a favorable temperature, the longer it will last, so cooling is very important. In this thesis, a hybrid car model was used during driving cycles to examine the status of the voltage and current of charging and discharging the battery and the amount of heat generated on the cell surface of the battery. Paraffin wax has also been chosen as a thermal management system of the hybrid car battery. In order to investigate the thermal behavior of the phase change material during the full melting process, the values of the thermal conductivity coefficient and thermal convection coefficient are obtained by numerical modeling. By comparing cooling with free convection and cooling with a phase change material, it was determined by thermal resistance variation that after applying the cooling, due to the reduction in the working temperature, the increase in free-convection increases.
