Pouch Battery Electrode Plate Geometry for Foldable Hermetic Sealing
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Solution Overview
Problem
Conventional pouch-type lithium-ion batteries face challenges in achieving high energy density due to the inability to perform sealing and edge-folding operations at the top without compromising the hermetic sealing effect, often resulting in wrinkles and damage to the packaging film.
Innovation Solution
The electrode plate design includes a blank foil region at one end corner and a notched region at another end corner, with specific angles between 30° to 60°, allowing for seamless sealing and edge-folding operations on both sides and the top, reducing gaps and preventing wrinkles during packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top seal edge length is set to a relatively large value to ensure hermetic sealing, then the sealing effect is improved, but the energy density is reduced due to increased material usage and inability to perform edge folding
Solution Approach 1:
The patent changes the geometric parameters of the electrode plate by introducing a notched region with specific angle ranges (30°-60°) at the end corners. This parameter modification allows the packaging film to form proper pockets during sealing without requiring excessive seal edge length, thereby reducing material usage while maintaining sealing quality and enabling edge folding operations.
Solution Approach 2:
The electrode plate is segmented into distinct functional regions: a coated region containing active material and a blank foil region providing structural support and forming tabs. The notched region further segments the end corner area to create appropriate geometry for sealing. This segmentation allows each region to optimize its function, enabling the top seal to be both hermetic and foldable.
2Ease of operation
If a special-shaped electrode plate structure with complex notched region is adopted to enable top sealing and edge folding, then the sealing and folding operations are enabled, but wrinkles are prone to form and the pocket may be damaged during stamping
Solution Approach 1:
The patent optimizes the geometric parameters of the notched region by specifying angle ranges (30°-60°) between the right-angled edges and boundary lines. These parameter optimizations ensure that the packaging film can be stamped to form proper pockets without excessive material stretching or pulling, preventing wrinkle formation and pocket damage while enabling necessary sealing and folding operations.
Solution Approach 2:
The notched region design creates a simplified geometric pattern that can be consistently reproduced during die-cutting of the electrode plate. This standardized copying of the notched geometry ensures uniform sealing performance across production batches while maintaining pocket integrity during the stamping process.
3Loss of energy
If the blank foil region is positioned to allow edge folding at the top, then the energy density is improved, but the hermetic sealing effect is compromised without proper notched region design
Solution Approach 1:
The patent modifies the geometric parameters by introducing a notched region with controlled angles (30°-60°) at the end corners where the blank foil region is located. This parameter change allows the blank foil region to extend to the edges for potential folding while the notched geometry ensures that the packaging film forms proper sealing pockets, maintaining hermetic sealing effectiveness.
Solution Approach 2:
The electrode plate design incorporates asymmetric features with the notched region positioned at specific end corners rather than uniform distribution. This asymmetric design allows the blank foil region to be strategically positioned for edge folding at the top while the notched geometry provides localized structural support to maintain sealing integrity at critical locations.
Data Source
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AI summary
An electrode plate body (1) includes a coated region (13) and a blank foil region (11) located at one end corner of the electrode plate body (1). A notched region (12) is provided at another end corner of the electrode plate body (1). A first boundary line (14) is between the blank foil region (11) and the coated region (13). An angle between a right-angled edge of the blank foil region in the short-side direction of the electrode plate body (1) and the first boundary line (14) ranges from 30° to 60°. A second boundary line (15) is between a notched region (12) and the coated region (13). An angle between the right-angled edge of the notched region (12) in the short-side direction of the electrode plate body (1) and the second boundary line (15) ranges from 30° to 60°.