Solid-State Battery Package Coating for Water Vapor Barrier Stability
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Solution Overview
Problem
Solid-state batteries face challenges in preventing water vapor transmission due to cracking and alteration of covering materials, which can compromise their functionality and safety.
Innovation Solution
A solid-state battery package is designed with a substrate, a solid-state battery, a covering insulating layer, and an inorganic cover film featuring a wet-plating composite layer with a ductile first layer and an alteration-resistant second layer, providing enhanced water vapor barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer covering material is used, then the device complexity is reduced, but the water vapor transmission prevention performance deteriorates due to cracking and alteration
Solution Approach 1:
The patent applies composite materials by using a multilayer covering structure consisting of a resin layer and an inorganic cover film with wet-plating layers. This composite structure combines the flexibility and adhesion of resin with the barrier and durability of inorganic plating layers, preventing both cracking and alteration while maintaining low device complexity
Solution Approach 2:
The patent segments the covering material into multiple functional layers: a resin layer for adhesion and flexibility, and multiple wet-plating layers (first and second layers) with different compositions and functions. This segmentation allows each layer to address specific issues - the resin layer prevents cracking while the inorganic layers prevent alteration and provide water vapor barrier
2Strength
If a ductile covering material is used to prevent cracking, then the alteration resistance deteriorates
Solution Approach 1:
The patent divides the protective covering into functionally segmented layers: a resin layer and first wet-plating layer provide ductility and crack resistance, while the second wet-plating layer with different composition provides alteration resistance. This segmentation allows each layer to optimize for its specific function without compromising the other
Solution Approach 2:
The patent uses composite materials with different properties in each layer - the resin and first plating layer are chosen for ductility to prevent cracking, while the second plating layer is chosen for composition stability to resist alteration. The composite structure achieves both crack resistance and alteration resistance simultaneously
3Reliability
If the covering material is made thicker to improve barrier performance, then the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of using a single thick layer, the patent employs composite materials in a multilayer structure where each thin layer contributes to the overall barrier performance. The resin layer and multiple wet-plating layers work together to provide superior water vapor transmission prevention compared to a single thick layer, while maintaining manageable device complexity
Solution Approach 2:
The patent transitions from a single-dimension (thickness) approach to a multidimensional approach by using multiple thin layers with different compositions and functions. This dimensional change in the covering structure provides enhanced barrier performance through the combined effect of multiple interfaces and material properties, rather than relying solely on increased thickness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses cracking and alteration of the covering material, thereby improving water vapor transmission prevention and extending the lifespan of the solid-state battery package.
Implementation Method 1
the first wet-plating layer has ductility
Implementation Method 2
the second wet-plating layer has alteration resistance
Implementation Method 3
improving water vapor transmission prevention
Data Source
AI summary
A solid-state battery package that includes: a substrate; a solid-state battery on the substrate; a covering insulating layer covering a main surface and a side surface of the solid-state battery; and an inorganic cover film on the covering insulating layer, the inorganic cover film including a wet-plating composite layer having at least a first wet-plating layer and a second wet-plating layer on the first wet-plating layer, wherein the first wet-plating layer has ductility and the second wet-plating layer has alteration resistance.