Power battery system connection abnormity fault safety early warning method

Abstract

The invention relates to the technical field of fault diagnosis, and discloses a power battery system connection abnormity fault safety early warning method comprising the following steps: 1, analyzing to obtain original battery signal data; 2, cleaning the original battery signal data to obtain primary battery signal data; 3, target voltage data are selected and obtained; 4, performing feature extraction on the target voltage data by adopting a difference quadratic sum method to obtain a difference cumulative matrix; step 5, calculating to obtain a mean difference matrix; 6, traversing column vectors of the mean difference matrix to obtain an upper limit of an abnormal threshold value of each battery cell; and 7, traversing the feature vectors of the battery cells in the mean difference matrix, and determining whether a connection abnormal fault exists or not. According to the method, the battery connection abnormal fault can be accurately identified, the fault false alarm rate can be effectively reduced, the fault can be quickly locked at the beginning of the fault, and the fault judgment efficiency is relatively high.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a safety early warning method for a power battery system connection abnormality fault. Background technique [0002] With the continuous reduction of global energy sources, more and more new energy sources have received more and more extensive attention. At present, new energy vehicles can be seen everywhere on the road, and more and more car owners choose to drive new energy vehicles for travel. However, as more and more safety issues of new energy vehicles have been continuously exposed, such as fire, slow charging speed, sudden failure and insufficient power, people have begun to pay more attention to the safety of new energy vehicles. [0003] In new energy vehicles, the power battery system is one of its most important components. As an important energy source or the only energy source for new energy vehicles, the power battery system is closely related to the safet...

AI Technical Summary

Problems solved by technology

Abnormal power battery connection faults are caused by loose high-voltage connections (through bolts, welding, etc.) between cells. It causes abnormal heat generation and bakes the battery cells. In severe cases, it will cause arcing and even fire problems, resulting in fire or explosion.

[0004] However, the existing identification devices or identification methods for abnormal battery connection faults are few and not accurate enough, and most of them are only judged according to the change of battery pressure difference. The judgment basis of this method is not reliable enough. In the actual operation of the battery, the influence of other operating factors will also cause the change of the battery pressure difference. Based on this judgment, there are many false positives and the judgment accuracy is poor.

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