Battery Electrode Straight-Edge Layout for Precise Assembly Alignment
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Solution Overview
Problem
The existing methods for manufacturing lithium secondary battery electrode assemblies, either by winding or stacking, face challenges in achieving accurate alignment of cathode and anode active materials, leading to defects and reduced battery performance due to tension differences and non-uniform boundary regions between coated and uncoated portions.
Innovation Solution
The proposed solution involves creating electrodes with specific straight sections cut out from the boundary regions or edges of coated and uncoated portions, allowing for precise alignment during the stacking process, which improves the accuracy of electrode assembly alignment and reduces defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a winding method is used to manufacture an electrode assembly, then the manufacturing process can be completed, but alignment accuracy of cathode and anode is decreased and materials are exfoliated
Solution Approach 1:
The patent extracts and removes the problematic boundary region between coated and uncoated portions from the electrode structure. By cutting out this boundary region to form a straight section, the patent eliminates the source of alignment errors and material exfoliation while maintaining the overall manufacturing efficiency of the winding method.
Solution Approach 2:
The patent applies preliminary action by pre-forming straight sections on the electrodes before assembly. These straight sections are created by cutting out boundary regions in advance, providing predetermined alignment references that ensure accurate positioning during the winding process, thereby preventing misalignment and material exfoliation.
2Manufacturing precision
If a stacking method is used to manufacture an electrode assembly, then alignment accuracy can be improved, but the boundary surface wrinkles making accurate alignment difficult
Solution Approach 1:
The patent extracts and removes the problematic boundary region between coated and uncoated portions from the electrode structure. By cutting out this boundary region to form a straight section, the patent eliminates the wrinkling issue at the boundary surface while maintaining the stacking method's alignment advantages.
Solution Approach 2:
The patent applies local quality by creating a specific straight section structure at the boundary region of the electrode, while leaving the rest of the electrode structure unchanged. This localized modification provides a uniform, wrinkle-free surface for accurate alignment during stacking without affecting the overall electrode performance.
3Manufacturing precision
If the boundary region between coated and uncoated portions is used for alignment, then alignment can be performed, but the non-uniform boundary region causes misalignment and defects
Solution Approach 1:
The patent extracts and removes the non-uniform boundary region between coated and uncoated portions from the electrode structure. By cutting out this problematic boundary region to form a straight section, the patent eliminates the source of misalignment while maintaining the ability to perform accurate alignment during assembly.
Data Source
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AI summary
Provided are an electrode comprising a coated portion that is coated with an active material; an uncoated portion that is not coated with the active material; and at least one selected from the group consisting of a first straight section formed by cutting out a part of the boundary region between the coated portion and the uncoated portion and a second straight section formed by cutting out an edge of the coated portion; an electrode assembly comprising the same; and a manufacturing method of the electrode assembly.