Analysis of maintenance methods for lithium battery 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 use the red meter pen to touch the positive pole of the lithium battery cell, and the black meter pen touch the negative pole of the cell. If it is a multimeter If it shows that there is no voltage or the voltage is very low, it proves that the battery 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 or other phenomena, first check whether the circuit of the over-current test pin is defective, and replace the protection IC if there is any. 3. No resistance or excessive resistance should be identified from the resistance pad The circuit will look for the reason, check whether the identification resistance is disconnected, whether it is the wrong resistance, whether there is a short circuit or an open circuit, etc. 4. If the battery cannot be charged, use the multimeter switch to select the 20v position, and then use the red meter pen to touch the positive electrode of the battery cell or the protection board. If the multimeter shows a voltage, we must decompose it according to the following conditions: Is there an output voltage? Is the cell voltage 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. 5. There is no internal resistance or the internal resistance is too large 1. If there is no internal resistance, check whether the pins of the MOS tube are damaged, and if so, just replace the MOS tube. 2. If the internal resistance is too large, then use a probe to contact the electric fish lithium battery protection board to test whether there is a bad 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 large, it will cause excessive internal resistance. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Do you know how to use lithium batteries for electric vehicles correctly?