Diagnosis method and device for low-voltage power supply failure of power battery system and electric vehicle

Abstract

The invention provides a method and device for diagnosing a low-voltage power supply fault of a power battery system and an electric automobile, and relates to the technical field of low-voltage systems. The method comprises the following steps of: periodically obtaining a voltage on a low-voltage power supply wire of the power battery system, determining whether the low-voltage power supply of the power battery system has a fault or not according to the voltage; when the low-voltage power supply of the power battery system is determined to have a fault, warning information is sent to an instrument controller, and the high-voltage power off of the whole automobile is controlled according to the current working mode of the whole automobile of the electric automobile; and after the whole vehicle is powered off at the high voltage, if a whole vehicle high-voltage power-on request signal is received, the whole vehicle high-voltage power-on request signal is not responded before the low-voltage power supply of the power battery system is determined to be fault-free. According to the scheme, the real-time detection of the stability and reliability of the low-voltage power supply of the whole vehicle power battery system is achieved, and fault prevention, monitoring and diagnosis are facilitated.

Description

technical field [0001] The invention belongs to the technical field of low-voltage systems, and in particular relates to a diagnostic method and device for low-voltage power supply faults of a power battery system and an electric vehicle. Background technique [0002] The vehicle's low-voltage power supply is the source of power for low-voltage electrical components such as battery management systems and relays. If the low-voltage power supply of the whole vehicle is interrupted or the power supply voltage is unstable, it will affect the normal use of the battery management system, relays and other electrical components and the service life of the electrical components, affect the high-voltage power-on or power-off operation of the whole vehicle, and even cause sudden power failure during driving. Severe interruptions that threaten the personal safety of users. [0003] The vehicle has experienced long-term operation or high-temperature and high-humidity environments. There...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a diagnostic method and device for low-voltage power supply faults of a power battery system, and an electric vehicle, so as to solve the problem in the prior art that it is impossible to ensure whether the low-voltage power supply at the input end of the power battery system is normal

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