What are the maintenance methods for lithium battery protection board?

Repair method of lithium battery protection board 1. In the case of poor voltage or abnormal no voltage or low voltage, first we should adjust the multimeter to the DC 20V position, and then touch the positive electrode of the lithium battery cell with the red meter pen, and the black meter pen If you touch the negative pole of the battery cell, if the multimeter shows that there is no voltage or the voltage is very low, then the battery core is damaged. Pay attention to check whether the positive and negative poles of the protection board are reversed. If they are reversed, the charger is equivalent to forced over-discharge when charging the lithium battery. 2. There is no over-current protection. If there is no over-current protection and other phenomena, first check whether the circuit of the over-current detection pin is defective, and replace the protection IC if there is any. 3. If there is no resistance or the resistance is too large, it is necessary to find the reason from the identification circuit of the resistance pad to check whether the identification resistance is disconnected, whether the resistance is incorrectly attached, whether there is a short circuit or an open circuit, etc. 4. No charging. First of all, we still need to use the switch of the multimeter to select the DC 20v gear, and then touch the positive electrode of the battery or the protection board with the red test pen. If the multimeter displays the output voltage, we will analyze it according to the following conditions : Is there an output voltage? Whether the cell voltage is normal. If the above voltage is not normal, we can basically judge that the protection IC or MOS tube has been damaged. At this time, it is enough to replace these two components. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the structural characteristics of soft-pack lithium batteries and cylindrical lithium batteries?