First of all, it must be clear that for most pure electric vehicle owners, the noise generated by the fan during charging is not only a normal phenomenon, but also a good thing. If the fan doesn't work, you need to worry As for a small number of car owners other than the "vast majority", I will tell you later.
Knowledge points that must be known
First of all, say a knowledge point. With this knowledge point, it is easy to understand. The battery of pure electric vehicle has a safe working temperature range, and the ideal state of most models is between 20-30 degrees. If you relax a little more, 10 to 40 degrees will be safe. However, if the standard is relaxed again, 0 to 50 degrees is close to the limit; If this limit is broken, it needs to be heated again when the temperature is the lowest and dissipated again when the temperature is the highest. Ok, now that the knowledge points are over, let's begin to explain the case. (Different brands and models have different calibration of battery temperature, but they are generally within the above range, and this data has strong universality, so we take the above temperature value as an example to represent it. )
The batteries of pure electric vehicles have a working temperature range, beyond which an external heating or cooling system is needed to help keep the temperature stable, otherwise it is easy to be dangerous.
I know everything, but why is the fan so noisy?
Many car owners will say, "My car was fine some time ago. Why is the charging so noisy recently? " First of all, I want to tell you that not only you, but almost all pure electric vehicles are like this. Do not believe you go to BYD, Geely, Roewe, Weimar and many other riders to see. Almost everyone will ask the same question. The biggest reason is the recent temperature rise.
As we said just now, the safe temperature range of the battery is 10 to 40 degrees. In this temperature range, the battery does not need external intervention. The ambient temperature was about 25 degrees some time ago. When charging, the temperature rise of the battery is between 35 and 40 degrees, and it is almost unnecessary to start the fan to dissipate heat. Even if the fan is started, it runs at a low speed. At present, the cooling fans used in cars are also classified according to the speed, and they do not reach the highest speed as soon as they are started. Within the safe range, even if the fan is started, it is a preventive measure or a slight heat dissipation.
However, in the last two days, the temperature has risen to about 40 degrees, and the vehicle temperature is even higher (the ambient temperature in the weather forecast is quite different from the measured temperature after the vehicle is exposed to the sun). After charging, the battery temperature rises from around 40 degrees, and soon exceeds the safety upper limit of 50 degrees, and the cooling system will start naturally. When the ambient temperature is close to 40 degrees, the battery temperature reaches 50 degrees or even higher, there is no wind blowing during driving, and the vehicle is stationary to help dissipate heat, then the cooling fans will basically turn on the maximum speed to dissipate heat, so the action must be great.
This is a photo taken by a thermal camera. When the ambient temperature is about 20 degrees, the vehicle is charged by DC fast charging, and the battery will heat up. At this time, the kettle temperature of the liquid cooling system responsible for battery cooling on the left side has reached more than 40 degrees, and the pipeline temperature has also reached about 42 degrees.
When a general vehicle is driving, the fan will turn on the maximum speed. However, due to the mixed environmental noise and sound insulation measures from the front of the car to the cab, it is difficult for you to hear the "roar" of the front fan when sitting in the car. However, once the vehicle stops, there is no mixed ambient noise. If you stand in front of the vehicle without any sound insulation and noise reduction measures, you will naturally hear the most "direct" noise.
Due to the cost of some models, the quality of condenser fans purchased is uneven. In this regard, there is no clear requirement in national standards, and enterprises will only require suppliers according to their own enterprise standards. Therefore, it is not difficult for car companies to save money in this "invisible" place.
In short, if your car has been bought for less than 2 years, and there are no fans running wildly in the cool days before, then you don't have to worry, your car is fine. However, if you have bought a car for more than 2 years and the fan runs wildly when the weather is cold, then your car may have some problems and need some simple treatment. It's Liu's fault that the fan didn't cool well.
Every year from spring to summer, there is a "public hazard" in Beijing, that is, catkins and Mao Mao are flying all over the sky, which is both annoying and dangerous. Many fires, including the famous ramp bus fire, are the result of catkin lighting in Mao Mao.
After the catkin season every year, the fuel owner needs to "report" to the 4S shop or repair shop to clean the catkin and Mao Mao filled in the fins with air guns or water guns, otherwise the water temperature will rise when starting. At the same time, replace the filled empty filter element. Otherwise, not only will the air volume at the air outlet suddenly drop, but the car will also be full of rotten and sour taste.
If you drive in Beijing, the radiator of the water tank has not been cleaned for 2 to 3 years, and the picture is basically like this.
Speaking of our pure electric vehicles, some people said that pure electric vehicles have no engine and do not need heat dissipation, so they adopted a closed grille design. This is misleading. Pure electric vehicles have no fuel engine, but they are not without heat dissipation. At present, most of the liquid-cooled temperature control systems, air-conditioning systems and motor-controlled liquid-cooled systems installed on vehicles need fans and heat sinks to cool down. Therefore, although the heat dissipation demand of pure electric vehicles is not as direct as that of fuel vehicles, it is also indispensable.
As can be seen from this photo, although it is a pure electric vehicle driven by a motor, there is still a large radiator (water tank) at the front of the vehicle to dissipate heat.
Then, during the flight season in Mao Mao, fuel vehicles will encounter the problem of "fin sticking", and pure electric vehicles will also encounter it. Take Beijing, the largest consumer city of pure electric vehicles, as an example. If you buy a car less than two years old, that is, fly to Mao Mao for one or two cycles, basically there will be no big problem, but if your car is more than three years old, then the Mao Mao in your radiator is likely to be as good as that of the fuel car.
If the fins are blocked by catkin Mao Mao, or even completely burned to death, the heat will be trapped in the pipe and cannot be dissipated. If the internal temperature cannot be reduced slowly, the fan will be forced to run at the maximum power and speed all the time, so it shows that the fan continues to run wildly during charging or driving. Even if the ambient temperature drops, because the heat is blocked in the internal pipeline, the cooling system continues to work, and the fan keeps making a "whirring" roar.
Do you know what it's like to be completely burned to death? That is, the place that seems to be ventilated and cooled now is wearing a thick "cotton-padded jacket". Can the water temperature be low?
So if your car encounters the above situation, I suggest you open the hood or check the exhaust hole under the front bumper to see if the shiny fins are filled with all kinds of Mao Mao or foreign objects. The treatment is also very simple. Go to the store or repair shop and wash with air gun and weak water. Never use the strong electricity of the car, or the radiator will fall off and be prepared to spend money to replace the whole radiator water tank.
Million car purchase subsidy