Insulating detection system and method of power battery for electric automobile

Abstract

The invention provides an insulating detection system and method of a power battery for an electric automobile, which can be used for detecting insulting resistance values of a high-voltage anode and a high-voltage cathode of a power storage battery to an automobile body ground. The system is applicable to a high-voltage insulating detection device of a new-energy electric automobile and comprises a high-voltage subsystem, an AD (Analog to Digital) sampling subsystem, an isolation subsystem, a communication subsystem and a fault alarming subsystem. According to the insulating detection system provided by the invention, through respectively connecting different resistors with a positive ground and a negative ground of the power battery in parallel, resistance values of insulating resistors can be calculated through collecting the voltages which are not merged into the resistors and the voltages which are merged into the resistors; the resistance values are output to a whole automobile controller through a communication module, and operation states of high-voltage circuits of the electric automobile are controlled, so that the safety of people and the electric automobile is ensured.

Description

technical field [0001] The invention relates to a battery management system in the field of electric vehicles, in particular to a high-voltage direct current insulation detection system and method. Background technique [0002] Electric vehicles are complex electromechanical devices, and the working conditions of electric vehicles are relatively harsh. Rapid changes in vibration, temperature and humidity may cause rapid aging or even insulation damage of power cables and other insulating materials, which will reduce the insulation performance of equipment. This will not only affect the normal control of the vehicle, but also endanger personal safety. Therefore, accurate and real-time measurement of the insulation performance between high-voltage electrical and vehicle body is of great significance to ensure the safety of passengers and vehicles and the normal operation of electrical equipment. [0003] Existing insulation detection technology only qualitatively detects the ...

AI Technical Summary

Problems solved by technology

[0002] The electric vehicle is a complex electromechanical device, and the working conditions of the electric vehicle are relatively harsh. The drastic changes in vibration, temperature and humidity may cause the power cables and other insulating materials to age rapidly or even damage the insulation, which will reduce the insulation performance of the equipment.

This will not only affect the normal control of the vehicle, but also endanger personal safety

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