Power lithium battery deterioration degree diagnosis method based on AC impedance

A technology of AC impedance and diagnostic method, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of lack of AC impedance, evaluating the state of charge of the battery, etc., to achieve the effect of improving the utilization rate and prolonging the service life

Inactive Publication Date: 2015-04-08
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, at present, the industry still lacks methods for evaluating battery state of charge and deterioration by using AC impedance.

Method used

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  • Power lithium battery deterioration degree diagnosis method based on AC impedance
  • Power lithium battery deterioration degree diagnosis method based on AC impedance
  • Power lithium battery deterioration degree diagnosis method based on AC impedance

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] refer to figure 1 , a method for diagnosing the degradation degree of power lithium-ion batteries based on AC impedance, including establishing the basic curve library of AC impedance of power lithium-ion batteries, collecting the AC impedance curves of power lithium-ion batteries to be tested, and analyzing the charge transfer of power lithium-ion batteries to be tested Impedance; the establishment of the power lithium-ion battery AC impedance basic curve library is to put the AC impedance curves of power lithium-ion batteries with different degrees of deterioration into the curve library as a basic curve; The AC impedance curve is obtained. The method provided by the invention includes a curve intelligent matching model, a charge transfer impedance model and a comprehensive evaluation model. The method is to intelligently match the A...

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Abstract

The invention relates to a power lithium battery deterioration degree diagnosis method based on AC impedance. The method comprises steps that, a power lithium ion battery AC impedance base curve database is established, and an AC impedance curve of a to-be-detected power lithium ion battery is acquired and is analyzed to acquire charge transmission impedance of the to-be-detected power lithium ion battery. According to the method, the AC impedance curve of the to-be-detected power lithium ion battery is acquired, combining an intelligent curve matching model, intelligent matching of the power lithium ion battery AC impedance base curve database is carried out to acquire a corresponding battery deterioration degree, further combining a charge transmission impedance model, the battery deterioration degree is acquired, and the battery deterioration degree is finally outputted through an integrated evaluation model. Through the power lithium battery deterioration degree diagnosis method, the battery deterioration degree can be acquired, optimization use of the power lithium battery can be guided, the utilization rate of the power lithium battery can be improved, and service life of the power lithium battery is prolonged.

Description

technical field [0001] The invention relates to a method for diagnosing the deterioration degree of a power lithium battery, in particular to a method for diagnosing the deterioration degree of a power lithium battery based on AC impedance, which belongs to the technical field of lithium battery testing. Background technique [0002] Lithium-ion batteries are widely used in large-scale energy storage systems such as electric vehicles and energy storage power stations due to their significant advantages such as high specific energy, high specific power, long cycle life, and high charge-discharge efficiency. The state of charge of the battery and the degree of deterioration of the battery are important performance parameters during the use of the battery, which respectively represent the remaining capacity and remaining life of the battery. Reasonably and accurately estimating the degree of battery deterioration is conducive to grasping the degree of battery aging, providing r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 张文华刘平王浩吴三毛刘爱华伍发元曹余良
Owner STATE GRID CORP OF CHINA
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