Fault diagnosis method of lithium ion battery sensor of electric vehicle based on observer

A technology for lithium-ion batteries and sensor failures, applied in the measurement of electrical variables, instruments, measurement devices, etc., can solve problems such as limited results, avoid missed diagnosis and misdiagnosis of faults, and shorten the delay of diagnosis.

Active Publication Date: 2018-12-21
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

However, there are relatively few literatures on the fault diagnosis of electric vehicle power battery sensors, and the results are relatively limited.

Method used

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  • Fault diagnosis method of lithium ion battery sensor of electric vehicle based on observer
  • Fault diagnosis method of lithium ion battery sensor of electric vehicle based on observer
  • Fault diagnosis method of lithium ion battery sensor of electric vehicle based on observer

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] refer to figure 1 , the present invention provides a kind of electric vehicle lithium-ion battery sensor fault diagnosis method based on observer, specifically comprises the following steps:

[0040] Step S1: Determine the type and model of the lithium-ion battery of the electric vehicle, obtain the corresponding technical parameters of the battery of this type, and establish an electrothermal coupling dynamic model of the lithium-ion battery of the electric vehicle on this basis;

[0041] Step S2: Under different temperatures, conduct open circuit voltage tests and HPPC experiments on the tested battery to obtain battery characteristic parameters;

[0042] Step S3: Establish the relationship between the battery open circuit voltage OCV and the SoC based on the experimental data, and on this basis, use the recursive least squares me...

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Abstract

The invention relates to a fault diagnosis method of a lithium ion battery sensor of an electric vehicle based on an observer, and belongs to the technical field of battery management. The method comprises the following steps: determining parameters of a lithium ion battery, and establishing an electrothermal coupling dynamic model of the lithium ion battery of the electric vehicle; performing anopen circuit voltage test and an HPPC experiment on the measured battery to obtain characteristic parameters of the battery under different ambient temperatures; establishing a relationship between battery OCV and SoC, and identifying the parameters in the electrothermal coupling dynamic model by using a recursive least square method with a forgetting factor to obtain a quantitative relationship among the battery parameters, the ambient temperatures and the battery SoC; and importing current, a voltage and a temperature sensor measured value into a fault diagnosis and separation algorithm of the lithium ion battery based on the observer, estimating a quantity of state through an extended Kalman filter algorithm to generate a residual, and performing residual evaluation by using a CUSUM test method, and finally achieving fault diagnosis and separation of the lithium ion battery sensor according to combined response conditions of different residuals.

Description

technical field [0001] The invention belongs to the technical field of battery management, and relates to an observer-based fault diagnosis method for lithium-ion battery sensors of electric vehicles. Background technique [0002] In response to the increasingly severe global climate and energy crisis, the automobile industry, which is closely related to human life, is at the forefront of changes. In recent years, electric vehicles have become the focus of pursuit by various countries due to their inherent advantages in emissions and energy consumption. The related research field has become a hot spot in academia and engineering circles. The power battery is the main energy source of electric vehicles and the most important part of electric vehicles. The operating performance of this component is directly related to the driving experience of electric vehicles and the safety of passengers' lives and property. In order to monitor the status of the power battery pack and ensure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01K15/00
CPCG01K15/007G01R35/00
Inventor 胡晓松冯飞许俊雄谢翌唐小林杨亚联
Owner CHONGQING UNIV
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