Why is the front of the car grille blocked?

Most electric vehicles have a closed front grille and have a smooth shape. Why? Why is it possible the front grille of electric vehicles blocks? Or what are the advantages of blocking the front grill?

The reason why is the front grille of engine cars open?
The engine ignites fuel and oxygen and uses explosive power to move the vehicle. At this time, there will be a lot of heat. So the front grill is open to cool the heat. Also, if the vehicle is traveling at high speed, it will face a headwind called the driving wind. The front part is open because the driving wind is also used to cool the engine.

What about electric car
The battery, motor, inverter, and reducer that can be said to be the driving system of an electric vehicle are called PE parts. PE parts do not generate much heat compared to engines. Therefore, there is no need for much cooling using the driving wind. Therefore, it is enough to make a small hole in the lower part to introduce only the necessary amount of wind.

Reducing air resistance in automobiles has a significant impact on fuel efficiency. Therefore, in order to reduce the air resistance of the vehicle, it is important to design the vehicle to cut through the air well.

Therefore, the reason why the front grille of electric vehicles is blocked is to increase driving efficiency.