How Electric Vehicles Manage Heat Without Traditional Radiators

The Thermal Challenges of Electric Mobility

Electric vehicles, such as the Nissan Ariya or the Hyundai Ioniq 5 N, have gained immense popularity not only for their innovative features like custom sound profiles or regenerative braking but primarily because they eliminate the need for an internal combustion engine. By moving away from fossil fuels, these vehicles reduce harmful emissions and lower fuel costs. Yet, despite these mechanical differences, EVs still face the fundamental physics of heat generation.

Many people assume that because an electric car lacks a traditional engine, it operates without generating heat. In reality, electric motors and their high-voltage battery systems can reach significant temperatures. Interestingly, these vehicles do not utilize traditional radiators in the way gas-powered cars do. Instead, their cooling systems function much like those found in high-performance computer hardware.

Advanced Cooling Methods

To keep components within safe operating parameters, electric vehicles typically rely on two primary cooling strategies:

• Liquid Cooling: This is the most prevalent and efficient method. Specialized coolant circulates through channels located beneath the battery pack, where the majority of heat is concentrated. The fluid absorbs the thermal energy and transports it to a heat exchanger, where the heat is effectively dissipated.
• Air Cooling: This simpler approach involves channeling external air directly through or around the battery pack. This necessity is the primary reason why many modern electric vehicles still feature front-end grilles, despite the absence of a conventional radiator, as they are required to facilitate airflow.

Why Do EVs Generate Heat?

To understand the necessity of these systems, one must look at how an EV functions compared to a traditional vehicle. A standard car uses a radiator and aluminum fins to shed heat produced by fuel combustion and moving engine parts. An electric vehicle, however, generates heat primarily through the conversion process of high-voltage direct current (DC) into alternating current (AC).

As the report from SlashGear notes, this is comparable to an electrical appliance becoming hot to the touch during heavy use, only on a vastly more complex and powerful scale. Without advanced thermal management, the intense energy transfer within an electric vehicle could lead to significant overheating issues.