First, the battery discharge heating cause: discharge too fast, may be small battery capacity, discharge current for a long time more than 0.5C. It is emphasized here that after a short drive, although the battery consumes a certain amount of electricity, after it is stationary, the battery has a recovery process, and the electrochemical process of the plate still continues, so the voltage will rebound, but it does not mean that the capacity will rebound; On the contrary, when the road does not stop during long-distance driving, the electrochemical effect of the plate and the consumption of electric energy are carried out at the same time, which will have three situations:
When the rated voltage of the motor is low, the battery capacity is small, the working current is large, the voltage will be sharply reduced, and the capacity will soon be consumed, which is the most unfavorable to the battery.
② The electrochemical reaction speed of the battery can only maintain the driving, the battery has no chance to recover and breathe, often do the whole cycle charge and discharge, and a little attention will be consumed. When facing the wind uphill, the power consumption is very large, forcing the battery plate to react sharply, the heat of the battery shell is high, which will cause the battery to be damaged and shorten the life, indicating that the capacity is not surplus.
③ It is more ideal that the electrochemical reaction speed of the battery can calmly supply enough electric energy. There is no abnormal heat in the battery shell, indicating that the battery capacity is surplus.
Second, the reason for the heat of battery charging: during the charging process of the battery, a part of the electrical energy is converted into chemical energy, and a part is converted into heat and other energy. It is normal for the rechargeable battery to heat up, but when the temperature is high, it should be checked in time whether the charging current is too large or whether there is a short circuit inside the battery. The relationship between the amount of heat and the amount of electrolyte is small, such as the internal resistance of the sealed battery is increased when the amount of electrolyte is small, it will also cause the battery to heat up and the terminal voltage is high when charging. Battery aging, electrolyte drying, internal short circuit, etc., will also cause heat. The charger can not be constant voltage in the late charging period, so that the battery voltage exceeds the allowable value, the temperature will rise, and the serious will bulge and the end of life.
solution
Now the only way is to add distilled water, but it will have two consequences, one is the battery gets better, the other is the battery is scrapped, because as early as a year of use when the distilled water should be added, the battery life is generally about two years, if the use is more frequent.
Check whether the charger is normal, use a multimeter to measure whether the output voltage of the charger is normal, if it is not too hot, it is normal.
In use, try not to put horizontally or upside down, to prevent a large amount of gas production inside the battery from being discharged smoothly from the air release valve, especially when charging, otherwise it may cause the shell to burst.