Why does the electric vehicle battery get hot during charging, and is it normal?
2 Answers
Slight heating is normal as the battery generates heat during the charging process, but excessive heat is abnormal. Here is relevant information: Causes of thermal runaway: The charger's output voltage is too high. The battery is low on water. The battery is damaged. The charging environment temperature is too high. Batteries that have been used for more than a year without water maintenance often exhibit this phenomenon. Improper charging habits: In real life, many electric vehicle users have improper charging habits. For example: charging immediately after riding, charging in high-temperature environments, frequent charging, overcharging, etc. The result of these practices is that the battery is prone to water loss, leading to deformation.
My electric car occasionally gets warm during charging, and as a daily user, I find this quite common. When current flows through the battery, it generates some heat because electrons inevitably produce friction while moving, which is a normal phenomenon. Especially during summer charging, a slightly warm feeling actually indicates the current is working. However, if the battery becomes too hot to touch or emits strange odors, that's a bad sign—it could be due to battery aging, charger malfunction, or excessive environmental heat. I recommend checking the battery temperature while charging; warm is fine, but high temperature means you should stop charging immediately and inspect it. It's best to use the original charger to avoid overload—my neighbor once experienced severe overheating followed by battery swelling. Regular maintenance can save a lot of hassle.
