Hermetic Packaging Member for Flexible Electrochemical Devices
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Solution Overview
Problem
Hermetic packaging members for flexible electrochemical devices face degradation due to repetitive external forces, leading to performance degradation as they fail to effectively prevent moisture and electrolyte volatilization.
Innovation Solution
A hermetic packaging member with a gas barrier layer featuring a slope portion and a plateau portion, including ridges and valleys, is designed to enhance durability by distributing strain and maintaining the shape of ridges without deformation, even under repetitive bending or distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetic packaging member is used to prevent moisture penetration and electrolyte volatilization, then the reliability of the electrochemical device is improved, but the packaging member degrades under repetitive external force
Solution Approach 1:
The gas barrier layer is selectively applied only to the slope portion of the hermetic packaging member where moisture penetration and electrolyte volatilization occur most frequently. This localized quality enhancement provides hermetic sealing precisely where needed without compromising the overall structural integrity under repetitive external forces.
Solution Approach 2:
The hermetic packaging member combines a gas barrier layer with the base packaging material to create a composite structure. The gas barrier layer provides superior moisture and electrolyte resistance, while the composite structure maintains flexibility and durability under repetitive bending and external forces.
2Adaptability or versatility
If the hermetic packaging member is made flexible to accommodate wearable devices, then the adaptability is improved, but the packaging member becomes more susceptible to damage from repetitive bending
Solution Approach 1:
The hermetic packaging member utilizes a thin film structure with integrated gas barrier layer that provides both flexibility for wearable device conformability and sufficient mechanical strength to resist repetitive bending. The thin film design allows the packaging to flex with the wearable device while the gas barrier layer maintains hermetic sealing performance.
Solution Approach 2:
The gas barrier layer acts as a protective cushion that prevents damage propagation during repetitive bending. By providing enhanced barrier properties in advance, the structure anticipates and mitigates the effects of repetitive strain before they can compromise the hermetic sealing.
3Ease of manufacture
If the hermetic packaging member is designed with a simple structure, then the ease of manufacture is improved, but the packaging member lacks the complexity needed to distribute strain effectively
Solution Approach 1:
Rather than complicating the entire packaging member structure, the gas barrier layer is applied locally only to the slope portion where strain concentration and potential failure occur. This targeted approach provides enhanced strain distribution capability precisely where needed while maintaining simple manufacturing processes for the rest of the packaging member.
Data Source
AI summary
A hermetic packaging member for packaging and sealing an electrode assembly of an electrochemical device includes an edge unit and a receiving unit having a predetermined depth in a thickness direction of the hermetic packaging member from the edge unit to receive the electrode assembly therein. The receiving unit includes a slope portion connected to the edge unit and a plateau portion surrounded by the slope portion. The slope portion includes a plurality of ridges and a plurality of valleys defined between the plurality of ridges.