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    There are many kinds of lithium batteries, including batteries composed of round cells like 18650 and lithium batteries composed of polymers. If they are divided into two categories, they are lithium metal batteries and lithium-ion batteries. The charging methods basically include constant current charging, constant voltage charging and pulse charging. Different charging methods are used in different stages. If the battery cannot be charged, there are several situations:

1. The lithium battery is in the over discharge state

    In other words, the lithium battery is discharged very low, in the deep discharge state, and the power is basically used up, so that it is as low as the cut-off voltage of the lithium battery. At this time, the activation method can be adopted, but this is not necessarily effective;

2. There is a problem with the charger or charging line

    First of all, check whether there is a problem with the charger. The method is very simple. Directly measure the output voltage or connect the load with the corresponding voltage and observe it. If there is a problem with the line, it will take some effort. After all, it involves circuit hardware and other problems, which can be directly disassembled and analyzed when necessary;

3. The lithium battery has been used for a long time, and the battery fails

    The possibility of such a situation is relatively small, but it cannot be ruled out. You should be familiar with your own battery and replace it as long as you use it;

4. There is a problem with the battery charging IC or BMS system

    Due to the imbalance of cells and other reasons, the battery management system has problems, which leads to the misjudgment of the management IC and the inability to detect voltage or current.

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