How to test the quality of UPS lithium battery protection board?

How to test the quality of UPS lithium battery protection board? 1. Make sure that the sampling line (flat line) is connected correctly. Take 7 battery 8pin wires as an example. B-wire connects to the total negative pole of the battery. B1 connects to the first string of battery positive poles. B2 connects to the second string of battery positive poles. Battery positive B4 line connected to the fourth string battery positive B5 line connected to the fifth string battery positive B6 line connected to the sixth string battery positive B7 line to the seventh string battery positive PS: 7 string battery The seventh string battery positive pole is also the total positive, the same The theory can be analogized to any string battery pack. The working principle of UPS lithium battery protection board 1. Overcharge protection and overcharge protection recovery When the lithium battery UPS protection board is charged and the voltage exceeds the set value VC (4.25-4.35V, the specific overcharge protection voltage depends on the IC), VD1 flips to make Cout turn to low level, T1 ends, and charging stops. When the battery voltage drops to VCR (3.8-4.1V, the specific overcharge protection recovery voltage depends on the IC), Cout becomes high, T1 is turned on and charging continues, VCR must be less than a fixed value of VC to prevent frequent jumps . 2. Over-discharge protection and over-discharge protection recovery. When the battery voltage drops to the set value VD (2.3-2.5V, the specific overcharge protection voltage depends on the IC) due to discharge, VD2 reverses, and after a short time delay, Dout changes to low level, T2 ends, and the discharge stops. When the battery is charged, the internal OR gate is flipped and T2 is turned on again to prepare for the next discharge. 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 the purpose of the lithium battery ceramic separator?