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Do new energy vehicles need "hot cars"?

December 23, 2024

Cold air coming

The "hot car" phenomenon may be common in gasoline vehicles

But it is a little strange for new energy owners

Fuel car before starting hot car

It's to keep the engine cold

Optimum operating temperature is achieved

For new energy vehicles

Again, things are different

Let's take a look


Ⅰ The concept of "hot car" for new energy vehicles

New energy vehicles, especially electric vehicles, are powered by battery packs rather than engines. Therefore, the traditional "hot car" is not applicable to new energy vehicles. However, when the new energy vehicle starts in cold weather, it does need to preheat the battery to ensure battery performance and extend battery life.


The "hot car" of pure electric vehicles is mainly to achieve better working conditions for key components such as batteries and motors. For example, in a low temperature environment, the performance of the battery will be affected, and the "hot car" can make the battery temperature increase properly, so as to restore or close to the normal charge and discharge performance. For hybrid vehicles, in addition to considering the battery and motor, it may also be necessary to take into account the preheating of the engine part (if the engine is involved in driving).


How to preheat

Automatic hot vehicles: Many new energy vehicles are equipped with intelligent thermal management systems. When the vehicle detects that the battery temperature is too low or the ambient temperature is low, it will automatically start the hot car program. For example, some high-end pure electric vehicles will automatically use the battery's own heat or heat the battery and motor through heating devices after the vehicle is unlocked or started. This process generally does not require too much intervention by the owner, and the control system of the vehicle will operate according to the preset procedure and the temperature information fed back by the sensor. Of course, many models now also support the mobile phone APP remote start vehicle preheating function.


Manual hot car (some vehicle support) : Some new energy vehicles also provide manual hot car options. The owner can start the hot car program through the vehicle's center control screen or specific buttons. For example, for some domestic new energy models, the owner can select the function of "preheating battery and motor" on the center control screen before the vehicle starts, and the system will begin to heat key components until the appropriate temperature range is reached.


The difference between "hot car" and fuel vehicle

Purpose difference: the traditional fuel vehicle hot owners in order to make the engine reach the normal operating temperature, so that the oil is fully lubricated, reduce engine wear; The owners of new energy vehicles should improve the performance of the battery and motor and extend the service life of the components.

Time difference: The traditional fuel vehicle hot car time may be relatively long, it is generally recommended to idle the hot car for a few minutes, so that the engine water temperature rises to a certain extent. The hot car time of new energy vehicles is usually short, especially vehicles with automatic hot car function, may be able to complete the preheating of key components in a few minutes or even tens of seconds, because it is mainly for the battery and motor components such as rapid heating, there is no need to wait for the engine as a whole to reach a stable working temperature like fuel vehicles.

Energy consumption difference: The traditional fuel vehicle will consume fuel during the hot car process, and the fuel combustion efficiency is not high at idle, which will produce certain exhaust emissions. New energy vehicles mainly consume electric energy, and if the battery's own heat is used to preheat, the energy consumption is relatively small.









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