Lithium ion power battery echelon utilization auxiliary analysis method and system

By conducting refined feature analysis and dynamic strategy optimization on retired lithium-ion power batteries, the problems of asynchronous capacity attenuation and internal resistance differences caused by changes in battery parameters were solved, and the efficient, safe and economical cascade utilization of lithium-ion power batteries was achieved.

CN120634535APending Publication Date: 2025-09-12XINYANG VOCATIONAL & TECHN COLLEGE +2
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Patent Information

Application Number
CN202510692151.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-27
Publication Date
2025-09-12

AI Technical Summary

Technical Problem

Existing methods for recycling lithium-ion power batteries fail to fully consider the dynamic characteristics of battery parameters changing over time and usage conditions, resulting in asynchronous capacity decay and increased internal resistance differences, affecting battery pack performance and safety. In addition, the lack of real-time monitoring and dynamic optimization capabilities leads to a decline in system efficiency and economic benefits.

Method used

By obtaining the operating parameter data of retired battery packs, voltage calibration, temperature compensation and data normalization are performed, the characteristics of single cells are extracted and the capacity and internal resistance dispersion are analyzed. The mode selection is carried out based on the capacity decay rate and internal resistance growth slope to achieve dynamic capacity reorganization and internal resistance balancing. The internal resistance degradation is predicted using electrochemical impedance spectroscopy and convolutional neural networks, and a comprehensive strategy is constructed and iterative optimization is performed.

Benefits of technology

It achieves dynamic balancing and optimization of battery pack performance, extends the cascade utilization cycle, improves resource utilization and economic benefits, and ensures the stability and safety of the system.

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Abstract

The invention relates to the technical field of lithium ion power battery recycling, and discloses a lithium ion power battery echelon utilization auxiliary analysis method and system, and the method comprises the steps: obtaining the operation parameter data of a decommissioned battery pack, analyzing the characteristics of a single battery, and confirming an echelon utilization mode (capacity recombination or internal resistance equalization); performing initial capacity and internal resistance grouping based on the mode, and generating adjustment data through capacity attenuation trajectory matching and internal resistance drift trend analysis; performing electrochemical state degradation prediction on the internal resistance adjustment data, and constructing an echelon utilization comprehensive strategy in combination with the adjustment data; and collecting strategy execution feedback data, evaluating a performance matching degree and iteratively optimizing the strategy. The system comprises a mode identification module, a capacity recombination module, an internal resistance balancing module, a strategy optimization module and a feedback execution module. According to the method, through multi-dimensional feature analysis, dynamic grouping, accurate prediction and closed-loop optimization, the efficiency and safety of echelon utilization of the retired batteries are improved, and the method is suitable for a recycling scene of the lithium ion power batteries.
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