Electrode Plate Adhesive Layout for Flat Tab Welding Regions
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Solution Overview
Problem
Poor battery flatness near the tab leads to issues of poor interface and lithium deposition in lithium-ion batteries, especially in narrow batteries where the tab welding region is close to the winding arc region.
Innovation Solution
The electrode plate design includes a current collector with a tab welding region and a paste coating region, where the adhesive paper covers the tab welding region, partially covers adjacent planar regions, and crosses over adjacent curved surface regions, ensuring improved flatness and preventing lithium deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery width is made narrow to reduce device size, then the battery dimensions are improved, but the tab welding region becomes close to the winding arc region causing adhesive paper folding and poor flatness
Solution Approach 1:
The adhesive paper is pre-applied to cover the tab welding region before the winding process. This preliminary action ensures that the tab welding region is protected in advance, preventing adhesive paper folding and maintaining flatness during the subsequent winding operation, even in narrow battery configurations.
Solution Approach 2:
The adhesive paper acts as an intermediary element between the tab welding region and the winding process. By positioning the adhesive paper to cover the tab welding region that is close to the winding arc region, it mediates the interaction between these components, preventing direct contact and potential folding while maintaining the narrow battery width.
2Reliability
If adhesive paper is applied to cover the tab welding region for protection, then safety is improved by preventing tab burrs from piercing the separator, but the adhesive paper may fold in narrow batteries causing poor flatness and lithium deposition
Solution Approach 1:
The adhesive paper is applied with specific local coverage, extending beyond the immediate tab welding region to include adjacent areas. This localized quality enhancement ensures that the adhesive paper maintains its protective function while also preventing folding in critical areas, thereby maintaining both safety and flatness.
3Reliability
If the adhesive paper size is increased to ensure complete coverage of the tab welding region, then safety is improved, but the adhesive paper is more likely to fold and cause poor flatness
Solution Approach 1:
The adhesive paper is applied with partial extension beyond the minimum required coverage area. It covers the tab welding region completely and extends to adjacent areas, providing excessive coverage in non-critical zones. This allows the adhesive paper to maintain complete protection of the tab welding region while the extended portions are positioned to prevent folding without causing harmful effects.
Data Source
AI summary
Disclosed are an electrode plate and a battery. The electrode plate includes a current collector, a tab, and an adhesive paper; the tab is disposed in the tab welding region the electrode plate is divided into a plurality of planar regions and curved surface regions that are alternately disposed; the adhesive paper covers the tab welding region, partially covers a planar region, crosses over an adjacent curved surface region on one side, and partially covers an adjacent planar region; and a projection of the adhesive paper on the adjacent planar region has a dimension L1, and 0<L1≤10 mm. The electrode plate in the present disclosure can solve a problem of poor flatness near a tab, and can solve a lithium deposition problem caused by the poor flatness near the tab.