Will the cooling fan of a new energy vehicle keep making noise during charging?
2 Answers
New energy vehicle cooling fans will continuously make noise during charging. Detailed explanation is as follows: It is normal for the cooling fan to operate and produce noise when a new energy vehicle is charging. During charging, high voltage is supplied to the battery, and the use of high voltage and current can easily cause the battery pack to overheat. When temperature sensors inside the battery detect this, they send an alert to the BMS (Battery Management System). As the core component of the battery, the BMS then sends a signal to the fan. Upon receiving this signal, the fan activates and starts rotating. This is a normal occurrence and a necessary function during the charging process of electric vehicles. Simply put, when the vehicle is not under heavy load, the fan noise is hardly noticeable. However, once the vehicle is overloaded, the fan noise becomes relatively louder.
I've noticed this issue while driving. The noise level of the charging fan in new energy vehicles is related to the charging status. During fast charging, the current is high and the battery heats up quickly, so the fan usually kicks in for cooling, making continuous noise—this is normal. Slow charging is different; with lower temperatures, the fan tends to stay idle. It also depends on the temperature: in summer, the fan often runs continuously during charging, while in winter, it might be quieter. I remember charging at a service station on a hot day—the fan ran loudly for two full hours—but at home with a slow charger, it was silent. If you park in a garage and turn on the AC, you might even hear the fan's pitch change as the system balances the battery temperature. Don’t worry, this is a normal protection mechanism. However, if the fan keeps roaring excessively beyond the charging duration, it's best to check the cooling system.
