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
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap