What Causes the Abnormal Noise During Electric Vehicle Charging?
2 Answers
Here are the reasons for abnormal noise during electric vehicle charging: 1. The battery charger has a fan for heat dissipation: Over time, dust accumulation on the fan can cause loud noise, which is the sound you hear. In this case, adding lubricating oil to the fan roller can solve the problem. 2. Failure of the front-stage filter capacitor: Increased ripple, which is usually accompanied by a decrease in charging current. 3. Uneven battery voltage: Electric vehicle batteries are composed of multiple battery cells connected in series, but their voltages cannot be exactly the same (ideally, each battery cell should have the same voltage). There is always one or two battery cells with higher voltage than the others.
I've encountered charging noises several times, and as a veteran EV owner, I find it quite normal. The main cause is fan cooling - the whooshing sound is to prevent battery overheating, especially louder during fast charging. You'll hear a click when relays switch, which is a normal current signal. Some noises come from coolant pump operation, like a small motor gurgling. For older vehicles, squeaks may occur from loose or aging parts rubbing - just check plug tightness then. Public charger fans themselves can also be noisy; simply switch stalls. Most cases aren't concerning, but if sounds become shrill or persistent, visit a service center to inspect battery systems for safety. Regular maintenance focusing on plugs and cooling components effectively reduces noise risks.
