A lithium iron phosphate battery batch safety state judgment method based on misplacement defects and related devices

By quantitatively characterizing multi-scale misalignment defects in lithium iron phosphate batteries and calculating the comprehensive defect index, the problem of the inability to quantify the degree of misalignment defects in lithium iron phosphate batteries in the existing technology has been solved, and scientific assessment and risk prediction of the safety status of batch batteries have been achieved.

CN122449366APending Publication Date: 2026-07-24CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
Filing Date
2026-04-28
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies cannot quantify the degree of misalignment defects in lithium iron phosphate batteries from the perspective of microscopic defects, which makes it impossible to accurately assess the safety status and batch risk of batteries in the same batch.

Method used

By obtaining test samples of lithium iron phosphate batteries from the same batch, the positive electrode sheets were disassembled and quantitatively characterized at multiple scales, including direct observation at the atomic scale, crystal structure refinement, and correlation analysis of electrochemical performance degradation. The comprehensive defect index was calculated, and statistical methods were used to determine the safety status and assess the batch risk.

Benefits of technology

This method enables quantitative analysis of the safety status of lithium iron phosphate batteries in batches, improving the scientific rigor and relevance of safety status assessment, providing a quantitative basis for batch risk evaluation, reducing the impact of randomness in individual samples, and enhancing the reliability and operability of the assessment.

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Abstract

The present application belongs to the technical field of lithium ion battery safety evaluation, and discloses a lithium iron phosphate battery batch safety state judgment method based on misplacement defects and related devices; the method comprises the following steps: selecting a plurality of battery monomers as test samples from the same batch of lithium iron phosphate batteries to be evaluated and disassembling to obtain positive electrode sheets; performing multi-scale misplacement defect quantitative characterization on the positive electrode sheets to obtain multi-dimensional defect characterization results; obtaining a comprehensive defect index based on the multi-dimensional defect characterization results; performing safety state judgment of the lithium iron phosphate battery based on the comprehensive defect index to obtain safety state judgment results of the test samples; and performing batch safety state evaluation according to the safety state judgment results of the test samples. The present application can quantitatively analyze the safety state of the battery and the batch to which the battery belongs from the perspective of micro misplacement defects of the positive electrode material, which is beneficial to overcome the problem that it is difficult to reveal the essence of material structure damage only by relying on macro performance testing.
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