Method and system for detecting connection integrity of high-voltage electrical system of electric vehicle

The invention discloses a method and a system for detecting connection integrity of a high-voltage electrical system of an electric vehicle. The method comprises the steps: firstly, detecting the voltage change between two ends of a high-voltage pre-charging loop and a high-voltage DC negative end through a voltage detection module of a battery management system, and calculating the pre-charging time after the pre-charging of the high-voltage electrical system of the electric vehicle is completed; and the battery management system judges the connection integrity of the high-voltage electrical system of the electric vehicle by comparing the actual pre-charging time with the theoretical pre-charging time when the connection of the high-voltage electrical system is complete. According to the method, the connection integrity of the high-voltage electrical system of the electric vehicle can be detected on the basis of low cost and no additional high-precision parts, and the safety of the high-voltage electrical sy