Why is the car battery heated when charging? Will it explode if it is hot?

It is normal for car batteries to charge and generate heat. Because the battery charging current is generally relatively large, the electrolyte inside will be in a heating and boiling state, and the temperature is normal. Coupled with the internal resistance of the battery itself, the passing current will naturally generate heat. However, if the heat is severe (hot hands), it may be due to improper charging operation, or there may be a problem with the battery, which will cause the battery to lose water and shorten the battery's life.

Charging the car battery will not explode if it is hot, but it will damage the battery. This may be caused by severe vulcanization or overcharging of the car battery, and the charging should be stopped immediately and the vulcanization should be repaired in time. Generally, charging takes about 8-10 hours. If you use low current charging, you need to charge about 12 hours to fully charge. However, it should be noted that it is best not to charge the battery when it is dead. It is recommended to charge it when the battery is about 70%. At this time, it only takes 6-8 hours to fully charge. Do not overcharge.

If the battery has been used for more than two years, if the battery is not charged according to the correct method, overcharging will easily cause the battery to lose water and cause the battery to become hot and hot. If the electrolyte in the battery is insufficient, you can fill it with an appropriate amount of distilled water or purified water, the purpose of which is to dilute the concentration, thereby increasing the solubility of lead sulfate and allowing it to proceed normally with electrolysis. In addition, if the battery is heated due to aging and short-circuit break, it indicates that the battery has been scrapped, and it is recommended to directly replace the battery with a new one.