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On-line measurement method of lithium ion battery eis low frequency band based on ladder wave

A lithium-ion battery and measurement method technology, which is applied in the field of rapid measurement of battery impedance, can solve problems such as the inability to realize lithium-ion battery EIS low-frequency online high-precision measurement, and achieve high precision and reduce calculation errors.

Active Publication Date: 2022-02-22
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0004] In view of the defects existing in the prior art, the object of the present invention is to provide an online high-precision measurement method for lithium-ion battery EIS in the low-frequency band based on the ladder wave, which can improve the existing technology that cannot realize the low-frequency band of lithium-ion battery EIS in engineering. On-line high-precision measurement and sinusoidal current test EIS and other issues

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  • On-line measurement method of lithium ion battery eis low frequency band based on ladder wave
  • On-line measurement method of lithium ion battery eis low frequency band based on ladder wave
  • On-line measurement method of lithium ion battery eis low frequency band based on ladder wave

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] Such as figure 1 As shown, a kind of lithium-ion battery EIS low-frequency online measurement method based on the step wave of the present invention comprises the following steps:

[0045] S1. According to the formula (1), the sine wave current required for the electrochemical impedance spectroscopy test is equivalent to a step wave current, and the step number N of a cycle sine wave current corresponding to the step wave current is determined,

[0046] the y n =Asin((n-1)H+H / 2) (1)

[0047] Among them, y n Indicates the current amplitude of the nth step, A indicates the current amplitude of the electrochemical impedance spectroscopy test, n=1,2,3,...,N, indicates the number of steps in the step wave current, N indicates the number of steps, H is calculated by formula (2),

[0048] H=2π / N (2)

[0049] S2. According to the sine wave current amplit...

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Abstract

The invention belongs to the technical field of rapid measurement of battery impedance, and relates to an on-line measurement method for lithium-ion battery EIS low-frequency band based on ladder waves, which includes determining the appropriate number of steps and current amplitudes of the ladder waves based on the electrochemical reaction characteristics of the lithium-ion battery and actual needs. ; Apply a ladder wave current in a suitable frequency range to the lithium-ion battery, and perform sinusoidal fitting on the sampled ladder wave current and response voltage to obtain the required low-frequency impedance value, and then form the low-frequency electrochemical impedance spectrum of the lithium-ion battery. , that is, low-band EIS. The low-frequency EIS online measurement method can accurately reflect the low-frequency impedance information of lithium-ion batteries; it has the effects of high accuracy of low-frequency EIS test results of lithium-ion batteries, easy engineering implementation, etc., and provides effective technical support for rapid battery health assessment and safety warning .

Description

technical field [0001] The invention belongs to the technical field of rapid measurement of battery impedance, and relates to a step wave-based lithium-ion battery EIS (electrochemical impedance spectroscopy, Electrochemical Impedance Spectroscopy) low-frequency on-line measurement method, in particular to a step-wave-based lithium-ion battery EIS low Frequency band online high-precision measurement method. Background technique [0002] The performance testing, status evaluation and safety warning of lithium-ion batteries have always been the key issues that need to be solved during the use of lithium-ion batteries. However, in actual use, due to the complex operating conditions and limited test data of lithium-ion batteries, it is difficult to accurately judge The status of lithium-ion batteries, evaluating the performance of lithium-ion batteries. In laboratory research, it is found that by analyzing the low-frequency band data of electrochemical impedance spectroscopy, m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/389G01R31/378G01R27/02
CPCG01R31/389G01R31/378G01R27/02
Inventor 孙丙香王家驹苏晓佳张维戈何锡添吴健张言茹周兴振
Owner BEIJING JIAOTONG UNIV
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