Battery system high-voltage relay adhesion fault detection circuit

The utility model relates to the technical field of new energy electric automobile power batteries, and discloses a battery system high-voltage relay adhesion fault detection circuit, which outputs detection current through a DC/DC power supply module U1, determines the output level state of a phototriode in an optocoupler U2 according to the on-off state of a high-voltage relay KM1, and detects the adhesion fault of a battery system high-voltage relay. The on-off state of the high-voltage relay KM1 is fed back to a controller (BMS or VCU or MCU) in real time, the controller can judge whether the high-voltage relay KM1 has an adhesion fault or not through comparison, and the detection circuit has the advantages that the detection circuit can independently work in a high-voltage part of a battery system, is electrically isolated from the controller (BMS or VCU or MCU) part, and is not interfered; the high-voltage relay adhesion detection circuit can detect adhesion conditions of contacts of corresponding high-