A method for screening battery characteristic frequency

By analyzing the frequency range of the electrochemical impedance of lithium-ion batteries, the appropriate sorting frequency range is determined, and the problem of waste of computing resources caused by excessive frequency range in the prior art is solved, and efficient battery inconsistent sorting is achieved.

CN118759376BActive Publication Date: 2025-04-04青岛艾诺仪器有限公司
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Patent Information

Application Number
CN202411137066.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-19
Publication Date
2025-04-04
Estimated Expiration
2044-08-19

AI Technical Summary

Technical Problem

When the existing method of sorting lithium batteries using EIS test, the frequency range is too large and the computing resources are wasted, and the battery inconsistency sorting problem cannot be effectively solved.

Method used

By performing discretial analysis on the electrochemical impedance of the electrochemical impedance curves of multiple lithium-ion batteries of the same model at different frequencies, we find out the frequency range that makes the electrochemical impedance dispersion meet the set standard and serves as the sorting frequency range.

Benefits of technology

Reduces data processing volume, improves processing speed, and achieves efficient battery inconsistency.

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Abstract

The present invention discloses a method for screening characteristic frequencies of batteries, comprising: performing a dispersion analysis on the electrochemical impedance of electrochemical impedance curves of multiple lithium-ion batteries of the same model at different frequencies, and finding a frequency range in which the dispersion of the electrochemical impedance meets a set standard as a sorting frequency range. The method for screening characteristic frequencies of batteries of the present invention sets a sorting frequency range, and only uses the frequency in which the dispersion of the sorting index meets the set range as the sorting frequency, and no longer performs a full frequency sweep, thereby reducing the amount of data processing and improving the processing speed.
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