Electrode Sheet Coating Boundary Detection for Accurate Thinning Regions
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Solution Overview
Problem
The accuracy of determining the boundary of the electrode sheet coating and thinning region in battery production is unreliable, leading to irregularities that affect lithium precipitation and electrical and safety performance.
Innovation Solution
A method and apparatus that quantitatively determine the boundary of the electrode sheet coating and thinning region by obtaining an initial contour curve from a contour curve set, calculating the ratio of negative to positive electrode capacity, and verifying it against a preset ratio to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the boundary of the electrode sheet coating and thinning region is directly set by means of experience, then the determination process is simple, but the accuracy of the boundary cannot be ensured
Solution Approach 1:
The patent replaces the mechanical/experiential method of boundary determination with an optical measurement system. A laser profiler scans the electrode sheet to obtain topographic data, which is then processed to generate contour curves. This substitution of mechanical judgment with optical measurement and computational analysis resolves the contradiction by providing high-precision boundary determination without relying on operator experience.
Solution Approach 2:
The patent introduces contour curves as an intermediary between the raw topographic data and the final boundary determination. The contour curves represent specific height levels (including the zero level) and provide a clear, objective criterion for defining the boundary. This intermediary transformation of data into visualizable contour representations enables precise boundary identification while maintaining a systematic and repeatable process.
2Manufacturing precision
If the boundary of the electrode sheet coating and thinning region is directly set by means of experience, then the process is quick, but the quality of the dried sheet and subsequent processing is affected
Solution Approach 1:
The patent performs boundary determination and contour curve generation before the drying and subsequent processing steps. By establishing the accurate boundary and thinning region definition in advance, the process ensures that all subsequent operations (drying, coating, processing) are based on precise geometric information. This preliminary action prevents quality issues in later stages while maintaining efficient production flow.
Solution Approach 2:
The patent replaces time-consuming trial-and-error adjustments and manual boundary setting with automated optical scanning and computational contour analysis. The laser profiler quickly captures topographic data, and the system automatically generates contour curves and determines boundaries, significantly reducing the time required while improving manufacturing precision of the dried sheet.
3Reliability
If the boundary is designed unreasonably, then the design process is simple, but lithium precipitation or insufficient lithium embedding occurs at edges
Solution Approach 1:
The patent implements a feedback mechanism where the determined boundary and contour curves are used to verify the合理性 (rationality) of the thinning region design. The system checks whether the boundary design achieves the desired thinning effect and prevents edge abnormalities. This feedback loop ensures that boundary designs are optimized to prevent lithium precipitation or insufficient embedding, thereby improving electrical and safety performance while maintaining a manageable design process.
Data Source
AI summary
The present disclosure provides a method and apparatus for determining a boundary of an electrode sheet coating and thinning region, an electronic device, and a medium, including: obtaining an initial contour curve from a contour curve set of an initial coating and thinning region of a target electrode sheet; determining an initial ratio of negative electrode capacity to positive electrode capacity according to a material region surface density corresponding to a material region in the target electrode sheet and the initial contour curve; and determining the initial contour curve as a boundary of the initial coating and thinning region if the initial ratio of negative electrode capacity to positive electrode capacity satisfies a preset ratio of negative electrode capacity to positive electrode capacity.