PRE-CHARGING CIRCUIT AND CONTROL METHOD THEREFOR, BATTERY MANAGEMENT SYSTEM, AND ELECTRIC VEHICLE

A pre-charging circuit. The circuit comprises: a capacitor Cx; a power battery (100), a positive electrode of the power battery (100) being connected to a first end of the capacitor Cx; a pre-charging inductor L, a first end of the pre-charging inductor L being connected to the first end of the capacitor Cx, and a second end of the pre-charging inductor L being connected to a second end of the capacitor Cx; a pre-charging switch (200), which is connected in series between a negative electrode of the power battery (100) and the first end of the pre-charging inductor L; and a switch control module (300), an input end of the switch control module (300) being connected to a negative electrode of the power battery (100), and an output end of the switch control module (300) being connected to the pre-charging switch (200), the switch control module (300) being used for acquiring a circuit signal within the pre-charging circuit, comparing the circuit signal against a reference signal to obtain a voltage value compar