A method and system for non-destructive evaluation of the state of cure of a cell based on ultrasonic signals

By employing a non-destructive evaluation method for the solidification state of battery cells based on ultrasonic signals, and utilizing ultrasonic waves and machine learning algorithms to monitor the solidification state of battery cells in real time, the method solves the problems of lag and inconsistency in solidification state monitoring during lithium-ion battery manufacturing, and achieves efficient and precise battery production control.

CN122330291APending Publication Date: 2026-07-03TSINGHUA UNIVERSITY +1
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIVERSITY
Filing Date
2026-03-17
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the current lithium-ion battery manufacturing process, there is a lack of non-destructive, in-situ, and precise means for real-time monitoring of the cell curing state, which leads to problems of under-curing or over-curing in mass production. Furthermore, traditional testing methods are costly and have a time lag.

Method used

A non-destructive evaluation method for the curing state of battery cells based on ultrasonic signals is adopted. Ultrasonic signals are collected and processed by acoustic coupling on the surface of the battery cell through an ultrasonic transmitting and receiving device. Multidimensional features and machine learning algorithms are used to monitor the curing state of the battery cell in real time, and the state evaluation model is used for classification and closed-loop control of process parameters.

Benefits of technology

It enables in-situ, non-destructive, and real-time monitoring of the cell curing process, improving the consistency and efficiency of battery manufacturing. It can accurately identify the curing stage and optimize process parameters, reduce energy consumption, and achieve personalized quality grading for each cell.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122330291A_ABST
    Figure CN122330291A_ABST
Patent Text Reader

Abstract

This invention discloses a non-destructive evaluation method and system for the curing state of battery cells based on ultrasonic signals, belonging to the field of lithium-ion battery manufacturing technology. The method includes: emitting ultrasonic signals to the battery cell through an ultrasonic probe and receiving the penetrating signals; continuously acquiring ultrasonic signals during the cell curing process; extracting multiple time-domain and frequency-domain features from the signals; inputting the multi-dimensional features into a pre-trained state evaluation model, and outputting a classification result or curing degree value of the cell curing state corresponding to the current time point, where the state includes a rapid curing stage, a slow curing stage, and a degradation stage; determining the curing endpoint or performing quality grading based on the classification result or curing degree value. This invention not only achieves in-situ, non-destructive, and real-time monitoring of the battery curing process, solving the problems of lag, destructive sampling, and reliance on fixed process curves in traditional methods, significantly improving the consistency and efficiency of battery manufacturing, but also enables closed-loop control of process parameters.
Need to check novelty before this filing date? Find Prior Art