Wound Cell Corner X-Ray Inspection for Electrode Misalignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring misalignment between cathode and anode electrode plates in lithium battery wound cells, such as using CCD cameras, are inaccurate near the winding starting and terminating positions, affecting the safety and quality of lithium battery products.
Innovation Solution
An inspection method and apparatus using a micro-focus X-ray source to obtain images of the corner region of the wound cell, with image enhancement and endpoint determination by a neural network model, allowing for accurate measurement of misalignment between the cathode and anode electrode plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CCD camera is used to measure misalignment layer by layer during the winding process, then the inspection coverage is comprehensive, but the measurement accuracy is poor near the winding starting and terminating positions due to focus loss
Solution Approach 1:
The patent extracts and inspects only the corner regions of the wound cell rather than the entire cell. By selecting specific corner regions that contain representative electrode plate layers, the method avoids the focus issues present in other areas while still obtaining reliable misalignment measurement data. This extraction approach allows accurate measurement without being constrained by the optical limitations of inspecting the full cell structure.
Solution Approach 2:
The patent uses X-ray imaging to create a copy of the internal electrode plate structure in the corner region. This imaging copy allows for precise measurement of misalignment between electrode plates without physically accessing or disturbing the actual wound cell structure, thereby maintaining measurement accuracy while avoiding the focus problems that would occur with direct optical inspection at certain positions.
2Measurement precision
If traditional optical inspection methods are used, then the device complexity is low, but the measurement capability is insufficient for accurate misalignment detection in wound cells
Solution Approach 1:
The patent replaces the traditional optical inspection system with an X-ray imaging system. This substitution enables penetration through the wound cell structure to directly image the internal electrode plates, achieving accurate misalignment measurement that is impossible with surface-level optical methods. The X-ray based imaging system overcomes the limitations of optical focus and provides clear visualization of the electrode plate boundaries for precise measurement.
Solution Approach 2:
The patent changes the inspection parameter from optical wavelength to X-ray wavelength. This parameter change allows the inspection system to penetrate the cell housing and electrode materials, providing direct imaging capability for internal structure measurement. The use of X-rays instead of visible light fundamentally enables the measurement of misalignment in the wound cell interior without requiring physical disassembly or complex optical arrangements.
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
Ensures accurate measurement of misalignment, preventing nonconforming products from entering the market and improving the quality and safety of lithium battery products by clearly differentiating and identifying electrode plates in the images.
Implementation Method 1
obtained by using a micro-focus X-ray source to emit X-rays that penetrate the corner region of the wound cell for imaging
Data Source
AI summary
An inspection method includes obtaining an image of a corner region of the wound cell that includes an image of a cathode electrode plate at N layers of the corner region of the wound cell and an anode electrode plate at the N layers, and determining, based on the image of the corner region, amounts of misalignment between the cathode electrode plate and the anode electrode plate that are adjacent in the wound cell. N is a positive integer.