High-voltage power-off method and system for electric automobile in limping mode

The invention relates to the technical field of electric automobiles, and provides a high-voltage power-off method and system for an electric automobile in a limping mode, a special limping mode circuit is used for controlling a power-off function which is crucial to safe operation of the electric automobile, an MCU (Microprogrammed Control Unit) with high cost is prevented from being used, and the difficulty of software design is simplified; the circuit is high in adaptability, and can be used for limp mode turn-off control of other key relays or contactors; an analog circuit and a delay control mode are adopted, enough time is reserved for a user to confirm power-off operation, and the potential safety hazard of power loss caused by false triggering of power-off is avoided. 本公开涉及电动汽车技术领域，提出了一种跛行模式下电动汽车高压下电方法及系统，通过专用跛行模式电路控制对电动汽车安全运行至关重要的下电功能，避免了使用成本昂贵的MCU，简化了软件设计的难度；电路适应性强，可以用于对其它关键继电器或接触器的跛行模式关断控制；采用模拟电路和延时控制的形式，给用户确认下电操作留出了足够的时间，避免了误触发下电导致动力丧失的安全隐患。