Battery management circuit, electric device and monitoring system

The utility model discloses a battery management circuit, an electric device and a monitoring system. The battery management circuit comprises a main control module, a detection module, an operationalamplifier comparison module, a load power supply switch module and a voltage-stabilizing power supply module, the detection module detects whether a detection object exists or not and transmits a correspondingly generated first detection signal to the operational amplifier comparison module; the operational amplifier module amplifies the first detection signal, compares the amplified first detection signal with a reference signal and outputs a second detection signal to the main control module; the main control module outputs a control signal to the load power switch module according to the second detection signal; the load power supply switch module controls the on-off of a load power supply; the equipment can be powered on and started to work only when needing to work; when not in use,the load is in a power-dow