Electric vehicle power battery management system with complete fault self-diagnosis function

Abstract

The invention discloses an electronic automobile power battery management system with a complete fault self-diagnosis function. The system is characterized in that a single unit information collection and fault diagnosis module is arranged in the battery management system; the single unit information collection and fault diagnosis module is used for acquiring single battery voltage and battery pack temperature data in a battery pack and diagnosing fault points with generation probability of faults, and fault self-diagnosis information is acquired; the single battery voltage, battery pack temperature data and the fault self-diagnosis information are taken as output signals to be sent to a master controller MCU (microprogrammed control unit) in the battery management system through an isolation and interface conversion module, and the master controller MCU in the battery management system receives output signals and transmits the signals to a vehicle control unit. With the adoption of the electronic automobile power battery management system with the complete fault self-diagnosis function, ASIL (automotive safety integrity level) of the electronic automobile power battery management system can be improved effectively.

Description

technical field [0001] The invention relates to a power battery management system of an electric vehicle, in particular to a battery management system with a complete fault self-diagnosis function. Background technique [0002] At present, although the electric vehicle power battery management system can realize various functions such as single voltage acquisition, temperature acquisition and equalization, there is a lack of research on fault diagnosis and improvement of functional safety level. In the existing research on the fault diagnosis of lithium-ion batteries and their management systems, the research is basically on the diagnosis of the battery system, including over-current, over-temperature, over-voltage, under-voltage and insulation detection, etc., but the battery management system itself is not A full diagnosis was not made. [0003] During the operation of electric vehicles, the battery management system may have various failures, including: ADC failure, refe...

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Problems solved by technology

In order to achieve the highest safety level ASIL-D, the battery management system must have a complete fault self-diagnosis function, but so far there is no public report on the relevant technology

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