What are the maintenance methods for the lithium battery pack protection board?

Repair method of lithium battery pack protection board 1. No voltage or abnormal voltage. If there is no voltage or abnormal voltage, 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 electrode of the battery cell, if the multimeter shows that there is no voltage or the voltage is very low, it means that the battery cell 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 pack. 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. Fourth, there is no internal resistance or the internal resistance is too large. If there is no internal resistance, check whether the pins of the MOS tube are damaged. If so, just replace the MOS tube. If the internal resistance is too large, it is necessary to use a probe to go to the protection board of the lithium battery pack to detect whether there are reasons such as poor contact or excessive oxidation. Also check whether there are more nickel chips on the battery core. If the number of nickel chips on the battery core is too much, it will cause excessive internal resistance. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to activate a lithium battery that has not been used for a long time?