Fault detection method, device and management system for power battery connector

Abstract

The invention provides a fault detection method and detection device for power battery connecting pieces and a power battery management system. The method includes the steps of: detecting energy feedback current of a power battery under the condition of braking of an entire vehicle and discharging current under the condition of normal running of the entire vehicle; judging whether the energy feedback current and the discharging current satisfy a first preset condition and a second preset condition respectively; if the energy feedback current and the discharging current satisfy the first preset condition and the second preset condition respectively, obtaining a first group of abnormal single cells under the condition of breaking of the entire vehicle and a second group of abnormal single cells under the condition of normal running of the entire vehicle; and generating a target abnormal single cell group according to the first and second groups of abnormal single cells, and determining the fault level of each single cell in the target abnormal single cell group. The method can judge all single cells in a power battery where connecting pieces are loose, and gives the corresponding fault level, so that corresponding measures are taken to guarantee safe and reliable working of the power battery, and the method is high in reliability and strong in universality.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a fault detection method, device and management system for power battery connectors. Background technique [0002] Usually, the power battery of an electric vehicle is composed of multiple single cells connected in series to provide high-voltage power for the entire vehicle. Because copper bars have the advantages of low resistivity and high flexibility, manufacturers often use copper bars to connect single cells. However, limited by the current assembly process technical conditions and complex and changeable road conditions, copper bars exist risk of loosening. Once the copper bar is loose, the contact resistance between the two single cells will increase, which will directly affect the measurement of the voltage of the single cells by the power battery management system. [0003] For example, when the power battery is charged, if the copper bar is loose, the measure...

AI Technical Summary

Problems solved by technology

[0005] But from the actual effect, when there is a loose copper bar in the power battery, the single cell with loose copper bar can be quickly found through the above method, and when there are two or more copper bars in the power battery When it is loose, the above method will fail, and the reliability is relatively low

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