What happens if charge the lithium battery after fully charged?

In the current battery market, lithium batteries have quickly occupied the market through safety, light weight, low maintenance cost, complete charge and discharge, and long service life. In addition to the service life, the advantages of lithium batteries are energy saving, environmental protection and pollution-free. This is also in line with the environmental situation. Yesterday, some users asked me, after the lithium battery is full, will it continue to be useful? I tell you, it can't be overcharged, but do nothing.

The green light is only an indication, and whether the real charge is full or not depends on the handling and discrimination of the charging process of the battery. Comment on this question with a 4.2V lithium-ion battery as an example.

The first is the control. The output of the battery is constant current first, then the constant voltage (the current gradually decreases, then the discrimination, when the current is less than a certain current value, the green light appears, due to the accuracy of the analog-to-digital conversion and its own voltage accuracy. It is limited. The charger usually sets this current value to 50mA. At this moment, the green light is on, so the battery is still less than 10% of its true fullness. (According to my measurement, today's lithium-ion battery is charged at 50mA. If it is, its capacity can now reach 95%, and the charging can be greatly improved. Today's question is what is being done:

If it continues, the charger completely shuts off the charging circuit, and does not continue to carry out constant voltage charging. Then placing 10 hours on the charger is also a drop in the bucket. A lot of the charging plan is like this, compared to Fang Xin Power's BQ2057 series charging chip.

The charger continues to be charged with constant voltage, and the voltage is strictly controlled to not exceed 4.2V. Undoubtedly, it can be charged for another hour, and it is indeed possible to add the capacity of the battery. ?

The charger continues to charge, but its current handling is very poor, accidentally causing the battery to exceed 4.2V and continue to run. Because lithium-ion batteries can't absorb any overcharge. Continue to apply current to the battery, this result will be formed, then overcharge will occur. This is of course a poorly planned seat charge. For example, the more common can be charged lithium ion batteries and nickel metal hydride batteries can be charged more than ten Yuan "egg charge".

There is also a charging processing chip, such as the 1679 chip, which is the same as many mobile phone charging procedures. It uses the pulse method to charge. When it shows the green light, the lithium-ion battery is now 100% full, and of course, it is placed for another hour. It will not overcharge, obviously it is doing nothing.

The user does not know in practice that the green light is on, what is going on in the future, A or B or D, maybe, the operating instruction does not write these things.

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