In daily use, automobiles release pollutants and require a lot of oil resources. To fulfil the strict emission standards, numerous researchers suggested various pollution management approaches and innovative technologies. Electric cars are considerably more productive, quiet, and have zero pollutants. They also have a lot simpler design. Main thing to be concentrated on the electric vehicle will be its battery performance and its cooling system. The different battery thermal management system is studied to identify suitable model of battery pack, coolants, cold plate design for better charging and discharging. A diverging-type cold plate design has been designed which is used to sandwich a 14AH lithium-ion prismatic battery cell. After the designing of cold plate, meshing is done with the help of a grid independence test in order to find the suitable mesh size for the simulation. A CFD simulation is carried out with the assigned boundary conditions including the flow rate of 1 g/s with the inlet temperature of 298 K, and the system is set to natural convection with a heat transfer coefficient of 5 w/m2K. Comparison of simulation is carried out with two different discharge rates of 4C and 5C with coolant as water and a mixture of water + ethylene glycol. The diverging-type cold plate design with water as coolant shows 0.3% better cooling performance at 4C discharge rate and with water + ethylene glycol mixture as coolant shows 0.4% better cooling performance at 5C discharge rate.