SELF-ACTIVATION CIRCUIT AND BATTERY PROTECTION SYSTEM

The present disclosure provides a self-activation circuit, where the self-activation circuit comprises an N-type metal oxide semiconductor (MOS) transistor Q, a PNP-type transistor Q, resistors R, R, R, R, and a capacitor C. A first end of the resistor R is connected with a detection pin (CS) of the battery protection chip, and a drain electrode of the N-type MOS transistor Q is connected with a second end of the resistor R. A source electrode of the N-type MOS transistor Q is connected with a ground end of the storage battery, and a gate electrode of the N-type MOS transistor Q is connected with the ground end of the storage battery by the resistor R. A collector electrode of the PNP-type transistor Q is connected with the gate electrode of the N-type MOS transistor Q, and an emitter electrode of the PNP-type transistor Q is connected with an anode (PB+) of the storage battery; a base electrode of the PNP-type transistor Q is connected with the anode (PB+) of the storage battery by the resistor R, and the base electrode of the PNP-type transistor Q is connected with the ground end of the storage battery by the resistor R. The capacitor C is connected with the resistor R in parallel. When the self-activation circuit is connected with the battery protection chip at first time, level of the detection pin (CS) of the battery protection chip automatically reduces, further automatically activating the battery protection system and improving reliability of the battery protection system.