In the past two days, the whole country has entered a high temperature mode, and the temperature can even reach 39℃. It’s so hot! If you are charging at an open-air charging station, and there is no rest area or leisure place around, can you stay in the car while charging and blowing the air conditioner? Some people on the Internet say that this will cause the battery to charge and discharge at the same time, which is easy to cause battery degradation and even cause spontaneous combustion and explosion, and there is always some worry in my heart.
So can you turn on the air conditioner while charging? This is a problem that many new energy vehicle owners will encounter. Today, I will give you a detailed analysis of the charging principle of new energy vehicles. I hope this article can help more new energy vehicle owners. If you find it useful, you can collect it and share it with friends in need around you!
Lithium battery charging principle
From the working principle of lithium batteries, it relies on chemical reactions (discharge) or external electric fields (charging) to promote the flow of electrons and lithium ions to achieve charge storage or release.
During the charging process, the electric field generated by the charger will guide electrons and lithium ions to the negative electrode, thereby establishing chemical energy inside the battery.
During discharge, electrons and lithium ions flow to the positive electrode under the impetus of chemical energy to release energy.
New energy vehicle charging design
Will charging while turning on the air conditioner cause battery damage?
Based on the above principle, new energy vehicles have considered this issue at the beginning of their design. When the new energy vehicle turns on the air conditioner while charging, the vehicle VCU (vehicle controller) will automatically allocate it according to the charging power.
If the charging power is large enough, the air conditioner will be driven directly by the charger, and the remaining energy will be used to charge the battery. If the charging power is not enough to drive the air conditioner, the insufficient part will be provided by the battery, but the battery is still in a discharge state at this time, but the discharge speed is slower. Therefore, when the new energy vehicle turns on the air conditioner while charging, the battery will not be in a state of simultaneous charging and discharging, so there is no need to worry about battery damage, let alone explosion.
Just like when using a mobile phone and charging it, if the charger power is sufficient, the power consumption of the mobile phone will be provided by the charger, and the remaining power will be used to charge the battery. If the charging power is insufficient, the power of the mobile phone will be provided by both the battery and the charger, but the battery power may gradually decrease.
In summary: If the car owners are charging and there is no lounge nearby, they can temporarily sit in the car and turn on the air conditioner.
Professional organization test proves:
When charging and using air conditioning, the battery temperature is only 2-3℃ higher than charging alone
This temperature difference has almost no effect on battery life (less than 0.5%)
Moderately using air conditioning can help cool the battery
Why does the official recommendation avoid using air conditioning while charging
Since new energy vehicles can use air conditioning while charging, why does the user manual recommend avoiding using air conditioning while charging?
Two factors are mainly considered: safety and charging efficiency. The first is safety. When the vehicle is in fast charging, the internal temperature of the power battery pack is high, which poses certain safety hazards, so people should try not to stay in the car. The second is charging efficiency. When we charge with air conditioning, part of the current output by the charging pile will be used by the air conditioning compressor, which will reduce the charging power and extend the charging time. Therefore, for safety reasons, car owners should still follow the relevant recommendations if there are other rest environment options.
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