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The circuit and parameters of the lithium-ion battery protection board vary depending on the IC used, voltage, etc. Below, DW01 with MOS transistor 8205A will be explained:

The normal working process of the lithium-ion battery protection board is that when the voltage of the battery cell is between 2.5V and 4.3V, the first and third pins of DW01 both output a high level (equal to the power supply voltage), and the voltage of the second pin is 0V. At this time, the voltage of the first and third pins of DW01 will be applied to the fifth and fourth pins of 8205A, respectively. The two electronic switches inside 8205A are in a conductive state because their G pole is connected to the voltage from DW01, that is, both electronic switches are in an open state. At this point, the negative pole of the battery cell is directly connected to the P-terminal of the protection plate, and the protection plate 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. At the same time, DW01 will monitor the voltage of the battery cell in real time through the R1 resistor. When the voltage of the battery cell drops to about 2.3V, DW01 will consider that the voltage of the battery cell is in the over discharge voltage state, and immediately disconnect the output voltage of the first pin, making the voltage of the first pin 0V. The switch tube in 8205A will close due to no voltage on the fifth pin.

At this time, the B - of the battery cell and the P - of the protection board are in a disconnected state. If the discharge circuit of the battery cell is cut off, the battery cell will stop discharging. The protection board is in an over discharge state and has been maintained continuously. After the P and P - of the protection board are indirectly charged with voltage, DW01 immediately stops the over discharge state after detecting the charging voltage through B -, and outputs a high voltage again on pin 1 to conduct the over discharge control tube in 8205A. That is, the B - of the battery cell is reconnected with the P - of the protection board, and the battery cell is directly charged through the charger.

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