Temperature Change of a Vehicle Battery During the Driving Cycle

Since electric vehicle usage is increased, battery thermal management systems has become a very important topic. In this study, a lithium-ion battery with a capacity of 30.5 Ah is modeled as a lumped system and a cold plate is designed to remove the heat from the battery. %50-50 water-ethylene glycol (WEG) is used as the heat transfer medium. Cold plate inlet temperature is set to 20°C for WEG and a cooling cycle is integrated into the system to provide the set temperature of the WEG. The initial temperature of the battery is set to 30°C. To calculate the heat generation of the battery, İstanbul driving cycle is used to calculate the needed power for the electric motor. The system is modeled in Matlab Simulink and iterative solutions are done in Matlab. Results show that the battery bottom surface temperature is kept at 21.57°C and cold plate outlet temperature for WEG is kept at 21.1°C and the power consumption of the compressor used for the cooling cycle is decreased from 425.82 W to 20.46 W during the process.