Lithium battery protection board quality test analysis

Lithium battery protection board quality test 1. Make sure that the sampling line (flat line) is connected correctly. Take the 8pin line of 7 batteries as an example. B- line connects to the total negative pole of the battery, B1 line connects to the first string of battery positive pole, B2 line to the second string of battery positive pole, B3 line to the third string of battery positive pole, B4 line to the fourth string of battery positive pole B5 line Connect the positive pole of the fifth string battery B6 line to the positive pole of the sixth string battery B7 line connect the positive pole of the seventh string battery PS: The positive pole of the seventh string battery is also the total positive pole, and the same can be applied to any string battery pack. 2. Use a multimeter to confirm that the battery cable is connected correctly. 1. Press the B-line terminal with the black meter pen of the multimeter and the B1 line terminal with the red meter pen of the multimeter to get the first battery voltage to be 3.584V. 2. By pressing the B1 line terminal with the black test pen of the multimeter and the B2 line terminal with the red test pen of the multimeter, the voltage of the second battery string is 3.584V. 3. Through this method of measurement, it is obtained: the first string battery voltage: 3.584V the second string battery voltage: 3.584V the third string battery voltage: 3.585V the fourth string battery voltage: 3.585V the fifth string battery voltage: 3.583V The battery voltage of the 6th string: 3.583V The battery voltage of the 7th string: 3.584V The voltage of the 7 strings are all 3.58V, the cable connection is correct, and the battery voltage difference is less than 0.002V, the battery consistency is good. PS: The voltage of each battery string should be: the voltage of ternary lithium is 3.0-4.2V; the voltage of lithium iron phosphate is about 2.0-3.6V; the voltage of lithium titanate is about 1.5-2.75V. If the voltage difference of any string exceeds 2V, it is declared that the cable is connected incorrectly, and the wiring must be re-wired. 3. After the measured voltage is normal, plug the cable into the protection board and measure the resistance between the protection board B- and P-. The resistance is 0, which means that they are unblocked before and the protection board is good. 4. Or you can measure the voltage of B- and the total positive electrode of the battery and the voltage of P- and the total positive electrode of the battery by connecting the B- line. The voltage is consistent, indicating that the protection board is normal (the protection board is equivalent to a switch, the switch has been turned on, and the current can pass through safely). Example detection: B-to the battery total positive voltage is 25.11VP-to the battery total positive voltage is 25.11V. If the two voltages are consistent, the protection board is normal. If P- is discharged through a large current, there will be a slight voltage drop and the protection board will heat up (about 50 degrees), which is a normal phenomenon. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.