High-voltage safety monitoring device for electric automobile

Abstract

The invention relates to a monitoring device of a high voltage system which is used for an electric automobile or a hybrid electric vehicle, comprising a battery management module which supplies a weak signal at one end of the high voltage system, and receives a return signal passing the voltage system at the other end, and judges whether the high voltage system occurs short circuit or open circuit failures according to amplitude of the return signal. One end of a positive end relay is connected to a positive end of the high voltage system, the other end is connected to a positive end of an inverter; one end of a negative end relay is connected to a negative end of the high voltage system, and the other end is connected to a negative end of the inverter. A precharge circuit formed by connecting a precharge relay and a precharge resistor in series is parallely connected with the positive end relay. The high voltage security monitoring device provided by the invention can avoid the circuit failure happened in a switching on process of the high voltage system and electrical impact of electrical equipments, and realize the safe switching on of the high voltage system through comparing the relation between the voltages of two ends of the high voltage system and the voltages of two ends of a battery.

Description

technical field [0001] The present invention relates to the high-voltage safety of pure electric vehicles or hybrid vehicles using high-voltage battery packs as energy sources, in particular to the safe connection of high-voltage systems of electric vehicles or hybrid vehicles, high-voltage insulation fault monitoring, high-voltage loop interlocking, etc. security monitoring. Background technique [0002] Electric vehicles or hybrid vehicles include a high-voltage system composed of a high-voltage battery pack, motor, etc. The voltage at both ends of the battery pack is usually greater than 144V. At the same time, in order to obtain higher energy efficiency, it is necessary to increase the voltage of the high-voltage system. In the case of power, reduce the current. Continuous improvement requires high-voltage systems to withstand higher voltages. Therefore, high-voltage system safety technology has become a key technology for the industrialization of pure electric vehicles...

AI Technical Summary

Problems solved by technology

[0004] As a safety issue of the high-voltage system, it has not yet attracted enough attention. For example, the safety of the high-voltage system includes the safety of drivers and passengers, the safety of electrical equipment in the car, and the safety of the battery itself. Therefore, high-voltage safety monitoring devices are required to monitor the insulation status of the high-voltage system, Functions such as high-voltage grounding status, high-voltage system connection status, high-voltage circuit connection control, vehicle collision disconnection control, etc., and no specific solutions have been proposed

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