Battery Jelly Roll Electrode Alignment Inspection Using Vision and X-Ray
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for inspecting the alignment of battery cell electrodes in a jelly roll are inefficient, often resulting in false determinations due to inadequate dimensional data and increased inspection time, which can reduce production efficiency and product stability.
Innovation Solution
A battery cell electrode alignment inspection method that combines electrode vision image data and X-ray image data to accurately measure the gap between negative and positive electrode plates, allowing for pass/fail inspections based on precise alignment information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gap measurement is performed at two points in edge area of jelly roll, then inspection time is reduced and productivity is improved, but measurement precision deteriorates due to diagonal direction measurement error
Solution Approach 1:
The patent transitions from conventional 2D planar measurement to 3D spatial measurement by obtaining three-dimensional coordinate information of electrode plates through X-ray imaging. This enables accurate gap measurement between closest adjacent electrode plates even when measuring at only two points, as the 3D coordinates allow calculation of true spatial distances rather than diagonal projections.
Solution Approach 2:
The patent introduces vision camera data as an intermediary to obtain dimensional information of electrode plates, which is then combined with X-ray image data. This intermediary measurement data enables accurate identification of electrode plate positions and dimensions, allowing precise gap calculation between closest adjacent plates without requiring multiple measurement points.
2Measurement precision
If inspection points are increased to at least three points for accurate alignment measurement, then measurement precision is improved, but inspection time increases and productivity decreases
Solution Approach 1:
The patent replaces conventional mechanical/optical gap measurement methods with X-ray imaging technology. The X-ray system captures images of the entire jelly roll interior, enabling simultaneous acquisition of positional information for all electrode plates throughout the structure. This substitution allows accurate measurement of gaps between closest adjacent electrode plates using only two inspection points, eliminating the need for multiple measurement points required by traditional methods.
Solution Approach 2:
By utilizing three-dimensional coordinate data from X-ray imaging, the patent can accurately determine the spatial positions of all electrode plates within the jelly roll. This 3D information enables precise calculation of gaps between closest adjacent plates regardless of their spatial arrangement, achieving high measurement precision with minimal inspection points.
3Productivity
If conventional gap measurement method is used at two points, then productivity is maintained, but reliability deteriorates due to false determination from inadequate dimensional data
Solution Approach 1:
The patent merges vision camera data with X-ray image data to create a comprehensive dataset. The vision camera provides dimensional information about electrode plates, while the X-ray imaging provides spatial position information of all electrode plates within the jelly roll. By combining these two data sources, the system achieves both high productivity (maintaining two-point inspection) and high reliability (accurate gap measurement between closest adjacent plates).
Solution Approach 2:
The patent uses vision camera dimensional data as an intermediary to enhance the interpretation of X-ray images. This intermediary information allows accurate identification of which electrode plates are closest adjacent to each other, enabling reliable gap measurement without false determinations, while maintaining the efficiency of two-point inspection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces the likelihood of false determinations by providing accurate alignment data, decreases inspection time per jelly roll, thereby increasing production efficiency, and enhances product stability.
Implementation Method 1
obtaining electrode vision image data by capturing vision images of individual negative and positive electrode plates configuring the jelly roll by a vision camera
Implementation Method 2
X-ray-capturing, by an X-ray projector, the jelly roll to obtain X-ray image data of the individual negative and positive electrode plates
Data Source
AI summary
A battery cell electrode alignment inspection method for inspecting an alignment state of a jelly roll configured of negative and positive electrode plates and a separator of a battery cell includes: obtaining electrode vision image data by capturing vision images of individual negative and positive electrode plates configuring the jelly roll by a vision camera; obtaining dimensional data of the individual negative and positive electrode plates; storing the obtained dimensional data of the individual negative and positive electrode plates; marking a cell barcode for identification of the jelly roll; scanning the cell barcode to receive dimensional data of individual negative and positive electrode plates; X-ray-capturing the jelly roll to obtain X-ray image data of the individual negative and positive electrode plates; and substituting the dimensional data of the individual negative and positive electrode plates to the obtained X-ray images of the individual negative and positive electrode plates.