Solid-State Battery Package Smoothing for Water Vapor Barrier Integrity
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Solution Overview
Problem
Solid-state batteries face challenges in preventing water vapor transmission due to irregularities at the interface between the covering insulating layer and the covering inorganic layer, which can lead to defects and compromised water vapor barrier functionality.
Innovation Solution
A solid-state battery package is designed with a covering insulating layer having a smoothed surface, ensuring a developed area ratio of 0.15 or less, to minimize surface irregularities and enhance the adhesion between the insulating and inorganic layers, thereby improving water vapor transmission prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a covering inorganic layer is provided to prevent water vapor transmission, then water vapor barrier function is improved, but defects occur in the covering inorganic layer due to irregularities at the interface with the covering insulating layer
Solution Approach 1:
The patent applies preliminary action by forming a smoothed surface layer on the covering insulating layer before depositing the covering inorganic layer. This pre-smoothing step prevents interface irregularities from propagating into the inorganic layer, thereby avoiding defects while maintaining the water vapor barrier function. The smoothed surface layer acts as a preparatory measure that eliminates the root cause of the problem before the critical inorganic layer is formed.
Solution Approach 2:
The patent introduces an intermediary smoothed surface layer between the covering insulating layer and the covering inorganic layer. This intermediary layer serves as a mediator that decouples the irregularities of the insulating layer from the inorganic layer, allowing the inorganic layer to be deposited on a smooth surface without direct contact with the irregular interface, thus preventing defect formation while preserving the barrier function.
2Strength
If the covering insulating layer has a smoothed surface, then adhesion between insulating and inorganic layers is improved, but the structure becomes more complex
Solution Approach 1:
The patent merges the smoothing function with the existing covering insulating layer by forming a smoothed surface layer as an integral part of the covering structure. Rather than adding a completely separate component, the smoothed surface layer is combined with the insulating layer to create a unified structure that provides both insulation and surface smoothing, thereby improving adhesion without significantly increasing overall structural complexity.
Data Source
AI summary
A solid-state battery package that includes: a substrate; a solid-state battery on the substrate; and a covering portion including at least: a covering insulating layer covering the solid-state battery; and a covering inorganic layer outside the covering insulating layer, wherein the covering insulating layer has a smoothed surface.