Open-circuit fault detection method and detection device for charging circuit of vehicle, and vehicle

The invention relates to the technical field of circuit detection, and provides an open-circuit fault detection method and an open-circuit fault detection device for a charging circuit of a vehicle. The open-circuit fault detection method comprises the steps of: acquiring an electromotive force of the output end of a generator of the vehicle and an electromotive force of a positive electrode of astorage battery of the vehicle; and according to relationships between a electromotive force difference value of the output end of the generator and the positive electrode of the storage battery and apreset upper limit threshold value as well as a preset lower limit threshold value, judging whether an open-circuit fault occurs in the charging circuit, wherein the upper limit threshold value is greater than the lower limit threshold value. According to the open-circuit fault detection method for the charging circuit of the vehicle, the open-circuit fault of the charging circuit can be found intime, a user can maintain