Battery micro-fault diagnosis method based on battery charging voltage ranking change

A battery charging and fault diagnosis technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as unstable voltage fluctuations

Pending Publication Date: 2021-09-14
HUBEI UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing technical problems, aiming at the long-term scale characteristics of battery micro-faults and the problem of unstable voltage fluctuations in micro-fault situations, and then propose a battery micro-fault diagnosis based on changes in battery charging voltage rankings The method is characterized in that it specifically includes:

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  • Battery micro-fault diagnosis method based on battery charging voltage ranking change
  • Battery micro-fault diagnosis method based on battery charging voltage ranking change
  • Battery micro-fault diagnosis method based on battery charging voltage ranking change

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Embodiment Construction

[0022] Below, the present invention will be further described in detail by taking the data of the faulty actual vehicle battery whose faulty label battery is the No. 12 battery as a sample.

[0023] A battery micro-fault diagnosis method based on battery pack consistency evolution, the steps are as follows:

[0024] Step 1: Screen the charging voltage data and denoise the voltage data

[0025] Use a first-order low-pass filter to denoise the voltage data, and the filtering formula is:

[0026] Y(n)=αX(n)+(1-α)Y(n-1) (6)

[0027] Among them, α is the filter coefficient, X(n) is the sampling value of this time, Y(n-1) is the output value of the last filter, Y(n) is the output value of this filter, and the voltage data of the charging section after denoising is as follows: figure 1 shown.

[0028] Step 2: Rank the voltage data of each single battery i obtained after denoising from large to small, and the voltage ranking of the faulty battery, that is, battery No.

[0029] Ste...

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Abstract

The invention discloses a battery micro-fault diagnosis method based on battery charging voltage ranking change and belongs to the technical field of batteries. The method comprises steps of long-time scale charging voltage data being used for analysis, and the charging voltage data of each single battery in the battery pack being denoised; performing ranking calculation on the denoised voltage data to obtain the ranking of each battery voltage in each sampling point in each charging section in the battery pack; and calculating an average value of the obtained voltage rankings of the batteries in the charging sections, carrying out fluctuation detection by using standardization processing, and detecting average voltage ranking change stability of the batteries in the continuous charging sections through an abnormal value detection algorithm based on a 3 sigma criterion to realize battery micro-fault diagnosis; and finding out a fault battery with abnormal voltage ranking change. The method is advantaged in that effectiveness of the fault diagnosis method is proved by using partial charging section data of a fault real vehicle battery data set to perform an experiment.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery fault diagnosis method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high specific energy, long cycle life, low self-discharge, and environmental protection. Due to these properties, they have become a popular rechargeable battery chemistry for a wide range of applications in portable electronics, electric vehicles, grid energy storage, and renewable energy. In order to meet the dynamic requirements of vehicle driving, hundreds of lithium-ion power batteries need to be assembled in series and parallel. Due to the aging process (SEI growth, lithium precipitation, active material loss, etc.) Various malfunctions can occur with accessories. Unchecked faults will adversely affect battery safety, and even lead to catastrophic accidents such as thermal runaway of the battery system and fire under certain extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/396
CPCG01R31/367G01R31/396
Inventor 常春周霞平姜久春高洋田爱娜
Owner HUBEI UNIV OF TECH
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