Spiral-Wound Electrode Assembly for Tight-Radius Battery Bending
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Solution Overview
Problem
Conventional electrode assemblies lack flexibility to be easily integrated into devices with curved or bent shapes, limiting their application in diverse device designs while maintaining battery characteristics.
Innovation Solution
A spiral-wound electrode assembly with a separator sheet between positive and negative electrode sheets, where both side end portions are bent in the same direction, forming a naturally curved shape with a curvature radius determined by the ratio of horizontal to vertical length, allowing for increased flexibility and maintaining battery characteristics even with repeated bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode assembly is made with conventional rigid structure, then the battery characteristics are maintained, but the flexibility and adaptability to curved device shapes are poor
Solution Approach 1:
The patent applies parameter changes by modifying the geometric dimensions of the electrode assembly, specifically setting the horizontal length to be 3 times or more the vertical length. This dimensional parameter change enables the assembly to achieve a curvature radius of 5mm or less when bent, providing the flexibility needed for curved device shapes while preserving battery performance characteristics.
2Adaptability or versatility
If the electrode assembly is bent with small curvature radius, then the flexibility is improved, but the battery characteristics deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing the horizontal-to-vertical length ratio to 3:1 or greater, which fundamentally changes the structural parameters. This allows the electrode assembly to bend to a curvature radius of 5mm or less without deteriorating battery characteristics, achieving both high curvature adaptability and maintained capacity retention.
Solution Approach 2:
The patent applies curvature principles by designing the electrode assembly with specific dimensional ratios that enable it to conform to curved surfaces. The horizontal length being 3 times or more the vertical length creates a structure that can achieve small curvature radii (5mm or less) while maintaining structural integrity and battery performance.
3Adaptability or versatility
If the horizontal length is increased relative to vertical length, then the flexibility and curved shape formation are improved, but the device complexity increases
Solution Approach 1:
The patent simplifies the design by applying a clear quantitative parameter rule: horizontal length ≥ 3 times vertical length. This straightforward parameter specification enables naturally curved shape formation without requiring complex structural designs, achieving flexibility through simple dimensional proportions rather than complicated mechanisms.
Data Source
AI summary
The present invention provides an electrode assembly having a one directionally spiral-wound structure with a separator sheet interposed between a positive electrode sheet and a negative electrode sheet, wherein the electrode assembly has a horizontal length (x) equal to or more than three times a vertical length (y), and both side end portions of the electrode assembly are bent together in the same direction by a curvature radius (R) satisfying the following Equation 1:S[{1/ln(x/y)}*t]=R 1wherein t is an average thickness (mm) of the spiral-wound electrode assembly, x is the horizontal length of the electrode assembly, and y is the vertical length of the electrode assembly, and S is a constant of 8 or more, and ln(x/y)≥1.