What Causes the Charging Battery to Overheat?

[Taylor]

Reasons and solutions for overheating of electric vehicle batteries during charging: 1. Battery issues: Aging of the battery, increased internal resistance, dried-up electrolyte, or internal short circuits can cause overheating. Additionally, the formation of sulfate crystals and sediment sticking to the lead plates during the charge-discharge process can increase battery resistance and lead to overheating. Solution: These issues can be addressed through technical means such as adding water, desulfation, and depolarization. If the battery overheats due to short circuits or broken plates, it is best to replace the battery. 2. Charger issues: Most chargers lack pulse functionality and negative pulse depolarization features. Such chargers often fail to maintain a constant voltage in the later stages of charging, causing the battery voltage to exceed permissible limits, which results in excessive gas generation, water loss, and overheating. Solution: It is essential to choose the correct charger for the electric vehicle. The charging process is an electrochemical reaction, and slight heating during this process is normal. However, if the heating is abnormal and the battery is in good condition, the issue likely lies with the charger.

[VanJuniper]

I just saw many car owners complaining about battery overheating during charging at the repair shop, usually caused by incorrect charger settings leading to overcharging and internal battery overheating. Internal short circuits can also cause temperature rise, such as electrolyte deterioration or poor contact due to aging plates. Poor environmental ventilation can exacerbate heating, especially during hot summer temperatures. Loose or corroded connectors increase resistance heat buildup. Old batteries have high impedance, low charging efficiency, and generate more heat. I recommend immediately stopping charging, checking environmental ventilation, and ensuring safe operation to prevent battery explosions. If you can't resolve it yourself, promptly visit a professional repair shop for inspection to avoid further damage.

[McHarrison]

Last month, my car battery got dangerously hot while charging, mostly due to excessive charging current and improper settings. Small internal short circuits or rusted connection points can also cause overheating. Hot and poorly ventilated weather makes it more prone to heating up, and older batteries tend to get hotter during charging due to reduced performance. When encountering this situation, I immediately disconnected the power and tried cleaning the connectors. Safety is the top priority, so it's best to avoid charging in the garage. Preventive measures include regularly checking the battery condition and charger parameters to extend its lifespan and maintain stable operation.

[LeoFitz]

Battery charging overheating is usually attributed to overcharging operations, such as the charger outputting too high a current. It may also be caused by internal short circuits in the battery, uneven electrolyte distribution leading to high temperatures, poor thermal ventilation, loose connection points generating resistance heat. Old batteries with low efficiency tend to generate more heat. It is directly recommended to check the charging equipment, maintain good ventilation during charging to reduce overheating risks, extend battery life, and ensure worry-free daily vehicle use.