Solid-State Battery Electrode Stack With Elastic Conductive Contact
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving reliable electrical connections between electrodes and current collectors due to the use of elastic bodies like rubber spacers, which compromise sealing properties and require high-temperature thermal expansion, making it difficult to maintain active material and electrolyte integrity.
Innovation Solution
The battery design incorporates a porous metal substrate embedded in the electrode mixture layers and an elastic conductive member that presses the electrode stack against the container, ensuring stable electrical connections through a conductive path, enhancing conductivity and reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic body such as a rubber spacer is used to press the conductive sheet against the electrode, then electrical connection is established, but the sealing property is reduced
Solution Approach 1:
The invention changes the material parameter from elastic rubber to elastic foam material, which provides the necessary elastic force for electrical connection while maintaining sealing properties through the foam's closed-cell structure that prevents fluid penetration
Solution Approach 2:
The invention uses composite material structure where the elastic foam material combines conductive properties with sealing capabilities, integrating both functions into a single component that presses the conductive sheet against the electrode while maintaining battery seal integrity
2Reliability
If thermally expandable butyl rubber is used as a spacer, then sealing and electrical connection are achieved, but high-temperature heating is required which may deteriorate active material and solid electrolyte
Solution Approach 1:
The invention extracts the thermal expansion requirement from the sealing mechanism, using instead an elastic foam material that provides sealing and electrical connection forces at room temperature or low temperature, eliminating the need for high-temperature heating that would deteriorate active material and solid electrolyte
Solution Approach 2:
The invention changes the activation temperature parameter from high-temperature thermal expansion (approximately 200°C) to ambient or low-temperature elastic deformation, making the process compatible with heat-sensitive battery components
3Reliability
If the thickness of the spacer is reduced by pressing with the lid, then electrical connection is improved, but the sealing property is likely to reduce
Solution Approach 1:
The elastic foam material serves as a composite structure that simultaneously provides electrical connection through conductivity and sealing through its foam structure, eliminating the need to reduce thickness at the cost of sealing
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
This configuration provides a highly reliable electrical connection, improves conductivity, and maintains battery integrity by preventing displacement and ensuring consistent contact between electrodes and current collectors, even under varying conditions.
Implementation Method 1
an elastic conductive member is disposed between the electrode stacked body and an inner bottom face of the sealing body, and the elastic conductive member is electrically connected to the conductive path and presses the electrode stacked body toward an inner bottom face of the recessed container
Implementation Method 2
a sheet-like porous metal substrate disposed on a surface of the positive electrode mixture layer... another end of the porous metal substrate of the positive electrode is exposed on a surface of the positive electrode
Data Source
AI summary
The all-solid-state battery includes an electrode stacked body that is accommodated in a battery container having a recessed container and a sealing body and has a positive electrode, a negative electrode, and a solid electrolyte layer. The positive electrode and the negative electrode each have a mixture layer and a sheet-like porous metal substrate disposed on a surface of the mixture layer. At least a portion of the porous metal substrate, including an end on the mixture layer side, is embedded in a surface layer of the mixture layer, and the other end of the porous metal substrate is exposed on a surface of the positive electrode or the negative electrode. An elastic conductive member is disposed between the electrode stacked body and an inner bottom face of the sealing body. The elastic conductive member presses the electrode stacked body toward an inner bottom face of the recessed container.