Electrode Leading Section Inclined Edge Stress Distribution
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Solution Overview
Problem
Electricity storage devices such as electric double-layer capacitors, electrolytic capacitors, lithium-ion capacitors, and lithium-ion rechargeable batteries face issues with electrode body damage due to stress during winding and bending, leading to cracks and deterioration of capacitor characteristics.
Innovation Solution
The formation of electrode leading sections with inclined edges on the element end-face of the electricity storage element, which are cut using parallel and inclining cut sections, helps distribute stress and prevent damage during the winding and shaping processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrode leading sections are formed with orthogonal protrusions, then connection to external terminals is achieved, but stress concentration occurs during winding and bending causing electrode body damage
Solution Approach 1:
The patent applies curvature by forming the electrode leading section with an inclined edge instead of a sharp orthogonal protrusion. The inclined edge creates a gradual transition that distributes stress along a larger area, preventing stress concentration and subsequent damage to the electrode body during winding and bending operations.
2Manufacturing precision
If electrode leading sections have sharp edges, then precise cutting and formation is achieved, but stress concentration leads to cracks and elongation
Solution Approach 1:
The inclined edge replaces sharp orthogonal edges, maintaining manufacturing precision through controlled cutting while eliminating stress concentration points. The curved/angled geometry distributes mechanical stress during winding and bending, preventing crack initiation and propagation.
3Ease of manufacture
If orthogonal electrode leading sections are used, then simple formation process is achieved, but form stability deteriorates under mechanical stress
Solution Approach 1:
The inclined edge geometry maintains ease of manufacture through straightforward cutting processes while dramatically improving form stability. The angled configuration provides a gradual stress transition that prevents deformation and maintains structural integrity during winding and bending operations.
Data Source
AI summary
An electricity storage device includes an electricity storage element formed by winding an electrode body of an anode or cathode side along with a separator, an electrode leading section having an inclined edge is formed on an element end-face of the electricity storage element by a part of the electrode body.