基于电化学阻抗谱的锂电池SOH的故障监测方法
By obtaining reference parameters from the SOH monitoring of lithium batteries, removing parasitic impedance and filtering out noise, and extracting the constant phase angle frequency band slope of the electrochemical impedance spectrum, the problem of misjudgment caused by lithium plating phenomenon and positive electrode coupling in existing methods is solved, and high-precision monitoring of lithium battery faults is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING ZHONGHAIJICHUANG SCI TECH DEV
- Filing Date
- 2026-02-27
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for monitoring the state of charge (SOH) of lithium batteries based on electrochemical impedance spectroscopy suffer from severe coupling between local lithium plating phenomena and the positive electrode's state of charge in in-situ non-destructive testing scenarios for full-cell batteries. This leads to the easy confusion of traditional impedance spectral parameters with other interfacial side reactions, making it difficult to accurately identify lithium plating faults on the negative electrode and reducing the reliability and accuracy of fault monitoring.
By obtaining the reference interface roughness parameters and area magnification factor under set state of charge, temperature and resting time, parasitic impedance is removed, noise is filtered out, the constant phase angle frequency band slope of the denoised interface impedance spectrum is extracted, the current interface roughness parameters are calculated and compared with the reference value, and the fault monitoring results are output.
Bypassing the attribution ambiguity caused by full-cell polarization coupling and internal resistance drift, it significantly improves the accuracy and reliability of early internal abnormal state monitoring of lithium batteries, avoids confusion of traditional judgment parameters, and can map the drastic changes in surface morphology caused by lithium plating on the negative electrode.
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Figure CN122043293B_ABST