Power Storage Device End Surface Exposure
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Solution Overview
Problem
Conventional power storage devices lack sufficient heat resistance, which can lead to performance degradation under temperature changes.
Innovation Solution
A power storage device design featuring a device main body with internal electrodes and an electrolyte retaining layer, where the electrolyte retaining layer and active material layers are exposed at the end surfaces, enhancing adhesion and reducing electrical resistance, and the use of adhesive members with controlled adhesion strengths to manage stress and maintain high output characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the internal electrodes are fully enclosed within the device main body, then the structural integrity is improved, but the heat resistance and stress management deteriorate
Solution Approach 1:
The electrolyte retaining layer and active material layers are extracted from the fully enclosed structure and exposed at the end surfaces of the device main body. This extraction allows the internal electrodes to maintain structural integrity while enabling direct thermal pathways and stress relief at the ends, resolving the contradiction between structural integrity and heat resistance.
Solution Approach 2:
The design transitions from a fully three-dimensional enclosed structure to a configuration where the electrolyte retaining layer and active material layers extend to the end surfaces. This dimensional change creates direct thermal and mechanical pathways at the ends, improving heat dissipation and stress management while maintaining overall structural integrity.
2Stability of the object's composition
If the adhesive members have strong adhesion to the internal electrodes, then the structural stability is improved, but the electrical resistance increases
Solution Approach 1:
The adhesive members are designed with differentiated adhesion properties: strong adhesion to the current collectors for structural stability, but controlled adhesion to the active material layers to minimize electrical resistance. This local quality differentiation resolves the contradiction between structural stability and electrical resistance by optimizing adhesion strength at different interfaces.
3Stability of the object's composition
If the active material layers are fully covered by electrolyte retaining layer, then the chemical stability is improved, but the adhesion and electrical performance deteriorate
Solution Approach 1:
The electrolyte retaining layer is extracted from complete coverage and repositioned to be exposed at the end surfaces alongside the active material layers. This extraction improves adhesion and electrical performance by creating direct contact areas while maintaining chemical stability in the covered regions through the retained electrolyte environment.
Data Source
AI summary
A power storage device that includes an electrolyte retaining layer between a first internal electrode and a second internal electrode. The electrolyte retaining layer retains an electrolyte. The first internal electrode has a first current collector and a first active material layer. The first active material layer is on a surface of the first current collector, which is closer to the second internal electrode. The second internal electrode has a second current collector and a second active material layer. The second active material layer is on a surface of the second current collector, which is closer to the first internal electrode. At least one of the electrolyte retaining layer, first active material layer, and second active material layer is exposed at the first and second end surfaces of the power storage device.