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Power battery pack fault diagnosis method based on improved Grubbs criterion and battery electro-thermal coupling model

A power battery pack, electro-thermal coupling technology, applied in the direction of measuring electricity, measuring electrical variables, testing electrical devices in transportation, etc., can solve the problems of a large number of sample data, difficult to adapt to the vehicle environment, data volume and computing power requirements

Inactive Publication Date: 2020-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The data-driven battery fault diagnosis method does not need to consider the complex battery mechanism to build a battery model, but requires a large amount of sample data, which requires high data volume and computing power, and is difficult to adapt to the vehicle environment.

Method used

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  • Power battery pack fault diagnosis method based on improved Grubbs criterion and battery electro-thermal coupling model
  • Power battery pack fault diagnosis method based on improved Grubbs criterion and battery electro-thermal coupling model
  • Power battery pack fault diagnosis method based on improved Grubbs criterion and battery electro-thermal coupling model

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Embodiment

[0074] Take a power battery pack with 10 single cells connected in series as an example, such as figure 1 , figure 2 As shown, the present invention is based on the improved Grubbs criterion and the battery electric-thermal coupled model of the power battery pack fault diagnosis method, including the following steps:

[0075] S1. Collect the voltage and surface temperature of each single cell in the power battery pack, specifically:

[0076] Collect the voltage signals V of each of the 10 single cells in the power battery pack n (n=1,2,3...) and the surface temperature T of each unit cell n (n=1,2,3...).

[0077] S2. Use the improved Grubbs criterion to screen out abnormal battery voltage and surface temperature values, specifically:

[0078] Using the sample median to replace the sample mean, the improved Grubbs criterion, for a certain sample data {x 1 ,x 2 ,x 3 ...}, data x i After the following transformation, the statistic S is obtained new :

[0079]

[008...

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Abstract

The invention discloses a power battery pack fault diagnosis method based on an improved Grubbs criterion and a battery electrothermal coupling model. The power battery pack fault diagnosis method comprises the following steps: collecting voltage signals and surface temperature signals of each single battery in a power battery pack; screening out abnormal data by utilizing an improved Grubbs criterion; determining the type and model of a single battery in the power battery pack, and building a battery electro-thermal coupling model; performing battery fault simulation based on the battery electro-thermal coupling model, and collecting output of the battery electro-thermal coupling model under the simulated fault condition; and comparing the screened abnormal data with the data acquired under the simulation condition, and determining the fault type of the battery pack. According to the method, the dynamic characteristics of the power battery are described by adopting the electro-thermalcoupling model of the battery, the electrical characteristics and the thermal characteristics of the battery are comprehensively considered, the battery fault situation simulated on the basis of themodel better conforms to the actual situation of battery faults, and the accuracy of a fault diagnosis conclusion made by combining the model is higher.

Description

technical field [0001] The invention belongs to the technical field of battery fault diagnosis, and relates to a power battery pack fault diagnosis method based on an improved Grubbs criterion and a battery electrothermal coupling model. Background technique [0002] Lithium-ion power batteries are widely used in new energy vehicles represented by pure electric vehicles due to their high energy density, low self-discharge effect and long cycle life. The individual cells in the battery pack can fail throughout the life of the vehicle. Among them, if the battery pack is overcharged, overdischarged, overheated and other faults, it is very easy to cause irreversible damage to the entire battery pack, thereby endangering the safety of the entire vehicle. Therefore, early diagnosis of the charging, over-discharging and overheating faults of the power battery pack is essential to ensure the safe operation of the vehicle. [0003] At present, the fault diagnosis and diagnosis meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396G01R31/367G01R31/392G01R31/388G01R31/385G01R31/36G01R31/00
CPCG01R31/006G01R31/3648G01R31/367G01R31/385G01R31/388G01R31/392G01R31/396
Inventor 田晟吕清
Owner SOUTH CHINA UNIV OF TECH
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