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3. Principle of overcharging protection control for lithium-ion battery protection board: When the battery is charged normally through the charger, the voltage of the battery cell will increase as the charging time increases. When the voltage of the battery cell rises to 4.4V, DW01 will consider that the voltage of the battery cell is in the overcharging voltage state, and immediately disconnect the output voltage of the third pin, causing the voltage of the third pin to become 0V. The switch tube in 8205A will close due to no voltage on the fourth pin. At this time, the B - of the battery cell and the P - of the protection board are in a disconnected state. If the charging circuit of the battery cell is cut off, the battery cell will stop charging.

The protective board is in an overcharged state and has been maintained continuously. After the discharge load is indirectly applied to the P and P of the protection board, although the overcharge control switch tube is closed, the positive direction of the internal diode is the same as the direction of the discharge circuit, so the discharge circuit can be discharged. When the voltage of the battery cell is placed below 4.3V, DW01 stops the overcharge protection state and outputs a high voltage at pin 3, making the overcharge control tube in 8205A conductive. That is, the B - of the battery cell and the protection board P - are reconnected, The battery cells can also perform normal charging and discharging.

4. Short circuit protection control process: Short circuit protection is a limit form of overcurrent protection, and its control process and principle are the same as overcurrent protection. Short circuit only adds a small resistance (about 0) between PP - to make the load current of the protection board instantly reach 10A or above, and the protection board immediately performs overcurrent protection.

The purpose of the lithium-ion battery protection board is to prevent overcharging or discharging of lithium-ion batteries and provide corresponding protection. Having a protective board can effectively protect the battery itself. Without it, lithium-ion batteries are prone to damage and pose safety risks. This is not a joke. Of course, protective boards are not used because the internal resistance is small, and the usage time may be slightly longer. The price is also cheaper, but personally, safety is still the top priority.

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