What is the reason for charging electric vehicle lithium battery charger?

Date:Jul 31, 2019

Sometimes the electric vehicle lithium battery charger may have abnormal heat during charging or use, which may reduce the battery capacity and shorten the battery life. The reason why the electric vehicle lithium battery is charged and heated is that the charger is not good, the quality problem, and the like. If this happens, we must be cautious.

Under normal circumstances, the electric car lithium battery charger charging heat is similar, not very high, but it is not low temperature, within the normal range, will not hurt the battery, but if you encounter excessive battery heating and charger If you don't turn the lights, you need to be cautious.

Professionals pointed out that the reason why the electric vehicle lithium battery charger will be excessively hot and hot during charging is mainly due to the following four reasons:

1. Lithium battery and charger do not match

This is the most common. Most households have one or more electric vehicles, and many families have different brands of electric vehicles. The chargers for lithium batteries are naturally different, but they are often mixed during use. The use of such a mismatched charger will cause the battery to move when the battery is charging, so there is a hot and hot situation. For this reason, it is recommended not to use other brands of chargers, just use your own.

2. The fever caused by the charger problem

The general charger has no pulse function, and there is no negative pulse to eliminate the polarization function. Such a charger usually cannot be at a constant voltage in the later stage of charging, and the voltage of the lithium battery exceeds the allowable value, thereby causing a large amount of gas outgassing, water loss and heat generation. When the battery has a slight heat generation, it is normal heat. If the heat is abnormal, it is the cause of the charger when the battery performance is good.

3. One of the batteries has a short circuit

You can use a multimeter to measure the voltage of each lithium battery. If you find that the voltage is very low, it is short circuited. I have to change the battery. In fact, there are signs that the battery was scrapped before. For example, when the battery was charged, the battery was not hot. After using it for a year or so (some even shorter), the battery was found to be hot when charging. I can feel it.) However, most users are surprised but not too concerned, because the feeling does not hinder the ride, and most of the time in the summer, the situation suddenly occurred.

4. The problem of the battery itself

Lithium battery aging, internal resistance becomes large, electrolyte is dry, internal short circuit and other problems caused by the battery itself. As the number of batteries increases, including discharge and charging, the water molecules in the battery are gradually lost, which causes the battery to heat up in the electrochemical reaction. In addition, the battery solution forms sulfuric acid crystals during charging and discharging, and the precipitate sticks to the plate. On the other hand, it will cause the battery resistance to increase and heat; if the battery is caused by a short circuit, the best way is to replace the battery.

Therefore, when choosing an electric vehicle lithium battery, try to choose a brand battery with high quality and good reputation. In addition, always pay attention to the manufacturer's instructions during the charging process, and strictly observe, especially in the charging time, do not think that the longer the time, the larger the capacity, the long time will damage the battery, and even lead to fire. Too little, frequent charge and discharge, will cause no small damage to the lithium battery.

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