How to use lithium battery protection board?

How to use the lithium battery protection board: The circuit and parameters of the lithium battery protection board are different according to the IC, voltage, etc. used. The following is an explanation with DW01 with MOS tube 8205A: 1. The normal working process of the lithium battery protection board is: When the core voltage is between 2.5V and 4.3V, the first pin and the third pin of DW01 both output high level (equal to the supply voltage), and the second pin voltage is 0V. At this time, the voltage of pin 1 and pin 3 of DW01 will be applied to pins 5 and 4 of 8205A respectively. The two electronic switches in 8205A are in the conducting state because their G poles are connected to the voltage from DW01, that is Both electronic switches are in the open state. At this time, the negative pole of the battery is directly connected to the P- terminal of the protection board, and the protection board has a voltage output. 2. Protection board over-discharge protection control principle: When the battery cell is discharged through an external load, the voltage of the battery cell will slowly decrease, and at the same time, the internal DW01 will monitor the cell voltage through the R1 resistance in real time. When the cell voltage drops to about At 2.3V, DW01 will think that the cell voltage is already in the over-discharge voltage state, and immediately disconnect the output voltage of pin 1, so that the voltage of pin 1 becomes 0V, and the switch tube in 8205A is closed because there is no voltage on pin 5. At this time, the B- of the battery cell and the P- of the protection board are in a disconnected state. That is, the discharge circuit of the battery cell is cut off, and the battery cell will stop discharging. The protection board is in an over-discharged state and has been maintained. After the P and P- of the protection board have indirect charging voltages, DW01 will immediately stop the over-discharge state after B- detects the charging voltage, and output a high voltage at pin 1 again to turn on the over-discharge control tube in the 8205A. That is, the B- of the battery cell and the P- of the protection board are reconnected, and the battery is directly charged by the charger. 3. Lithium battery protection board overcharge protection control principle: When the battery is normally charged by the charger, as the charging time increases, the voltage of the battery cell will become higher and higher. When the battery cell voltage rises to 4.4V, DW01 will think that the cell voltage is already in the overcharge voltage state, and immediately disconnect the output voltage of pin 3, so that the voltage of pin 3 becomes 0V, and the switch tube in 8205A is closed because there is no voltage on pin 4. At this time, the B- of the battery cell and the P- of the protection board are in a disconnected state. That is, the charging circuit of the battery cell is cut off, and the battery cell will stop charging. 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 article: How to properly charge the lithium battery?