Battery protection circuit and power tube control method thereof

The invention discloses a battery protection circuit and a power tube control method thereof. The battery protection circuit comprises an overcharge protection circuit, a logic control circuit and a state detection circuit. The state detection circuit comprises a first state transition detection module and a second state transition detection module, a first state transition detection module is used for detecting the working state of a battery during overcharge in real time, and when a state detection circuit detects that the battery is in an overcharge state and the battery is discharged, a logic control circuit is controlled to change an output signal of a control end CO from a low level to a high level, so that a second power tube is switched on; the problem of serious heating of the second power tube is effectively avoided; the second state transition detection module is used for detecting the working state of the battery in the over-discharge process in real time, when it is detected that the battery is i