A portable electrochemical impedance spectroscopy online measurement system and method for lithium ion batteries

By utilizing a portable online electrochemical impedance spectroscopy system, and employing step function current excitation and wavelet transform techniques, the problem of real-time monitoring of lithium-ion battery safety using traditional electrochemical workstations has been solved. This system enables low-cost, portable online measurement and real-time safety monitoring, improving the accuracy and reliability of the measurements.

CN122362162APending Publication Date: 2026-07-10INNER MONGOLIA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF TECH
Filing Date
2026-05-12
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Traditional electrochemical workstations are complex to operate, time-consuming, difficult to move, and expensive, making it difficult to achieve real-time online safety monitoring of lithium-ion batteries and unable to provide early warnings of safety risks to batteries in use.

Method used

Design a portable online electrochemical impedance spectroscopy measurement system, including a power supply system, a power transmission system, a control system, a measurement circuit module, and a data analysis module. The system achieves online measurement of electrochemical impedance spectroscopy through step function current excitation and wavelet transform technology.

Benefits of technology

This technology enables low-cost, portable online electrochemical impedance spectroscopy measurements, improving measurement accuracy and reliability. It allows for real-time monitoring of the safety status of lithium-ion batteries during charging, reducing measurement errors and time costs.

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Abstract

This application discloses a portable online electrochemical impedance spectroscopy measurement system and method for lithium-ion batteries, relating to the field of lithium-ion battery technology. The system includes: a power supply system for powering a power transmission system and an online measurement system, connected in parallel with a charger connected to the battery pack to achieve synchronous charging and impedance measurement; a power transmission system for converting direct current into a step function current, which is superimposed on the DC charging current and injected into the battery pack as an excitation signal; a control system for adjusting the frequency of the step function current using pulse width modulation technology; a measurement circuit module for acquiring the current and voltage signals of the battery pack; and a data analysis module for processing the time-domain signal using wavelet transform to calculate the electrochemical impedance spectrum. This application achieves low-cost, portable online measurement, enabling monitoring of the battery impedance spectrum during charging and providing support for safety early warning.
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