The circuit is mainly composed of dw01, charge and discharge control mosfet1 (containing two n-channel mosfet). The single lithium battery is connected between b and b -, and the battery pack outputs voltage from p and p -. When charging, the output voltage of the charger is connected between p and p -, the current is from p to the b and b of the single battery, and then mosfet to p is controlled by charging. In the charging process, when the voltage of the single battery exceeds 4.35V, the oc foot output signal of the special integrated circuit dw01 turns off the charging control mosfet, and the lithium battery stops charging immediately, so as to prevent the lithium battery from being damaged by overcharging. In the discharge process, when the voltage of the single battery is reduced to 2.30v, the od foot output signal of dw01 turns off the discharge control mosfet and the lithium battery stops discharge immediately, thus preventing the lithium battery from being damaged by overdischarge. The cs foot of dw01 is the current detection foot, and when the output short circuit is short circuit, the on-voltage drop of mosfet is increased sharply, the voltage of cs foot increases rapidly, and the dw01 output signal makes the charge and discharge control mosfet turn off rapidly. In order to achieve overcurrent or short circuit protection.
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