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EIS rapid measuring method of lithium-ion battery

A lithium-ion battery and measurement method technology, applied in the field of rapid measurement of battery impedance, can solve the problems of slow EIS test, difficulty in engineering implementation, long test time, etc., and achieve the effects of accurate measurement, fast test speed and short test time

Inactive Publication Date: 2017-07-21
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a fast EIS measurement method for lithium-ion batteries, which can improve the problems in the prior art, such as slow sinusoidal current test EIS test, long test time, and difficult engineering implementation.

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] Such as figure 1 Shown, the EIS fast measurement method of a kind of lithium-ion battery of the present invention, comprises the steps:

[0035] S1. According to the impedance of the lithium-ion battery tested in the laboratory, determine the range of the response voltage of the lithium-ion battery at different frequencies;

[0036] S2. Determine the frequency and amplitude of the excitation square wave current at different frequencies according to the impedance of the lithium-ion battery tested in the laboratory and the amplitude range of the response voltage, and form an excitation square wave current spectrum of different frequencies and different amplitudes;

[0037] S3, applying a square wave current to the lithium-ion battery, determining the frequency of the square wave current to be applied, determining the sampling frequency according to the ...

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Abstract

The invention relates to an EIS rapid measuring method of a lithium-ion battery, and provides an EIS rapid measuring method based on square wave current excitation and Fourier transform. The method includes: selecting a square wave excitation frequency based on an electrochemical reaction characteristic of the lithium-ion battery, determining that the lithium-ion battery is in an appropriate polarized voltage amplitude range, and selecting a sinusoidal alternating current amplitude according to the range; applying a square wave current of a selected frequency point and with a specific amplitude to the lithium-ion battery, performing Fourier transform on the square wave current and a response voltage obtained by sampling, and obtaining the impedance of a specific frequency point; and screening the impedance with a specific frequency based on a frequency spectrum amplitude of Fourier decomposition of the response voltage and an impedance change rule to form the electrochemical impedance spectroscopy of the lithium-ion battery, namely EIS. According to the EIS rapid measuring method, the electrode reaction characteristic of the lithium-ion battery can be accurately described, the EIS of the lithium-ion battery is accurately obtained, the EIS test speed of the lithium-ion battery is fast, the test time is short, and the project is easy to realize.

Description

technical field [0001] The invention relates to the technical field of quick measurement of battery impedance, in particular to a quick measurement method for EIS of a lithium ion battery, in particular to a method for quick measurement of the EIS of a lithium ion battery by using waveforms such as square waves and triangular waves. Background technique [0002] The dual pressure of energy shortage and environmental pollution has boosted the rapid development of electric vehicles. Lithium-ion batteries have become the preferred battery for electric vehicles due to their advantages of high single voltage, high energy density, long life, no memory effect and no pollution. . [0003] The performance detection, state estimation and safety warning of lithium-ion batteries have always been the key problems to be solved during the use of lithium-ion batteries. However, due to the complex operating conditions and limited test data of lithium-ion batteries during use, it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R31/36
Inventor 沈迪阮海军姜久春李雪飞韩伟王占国张维戈吴健
Owner BEIJING JIAOTONG UNIV
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