Solid-State Battery Laminate Assembly for Fire-Safe Electrolytes
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Solution Overview
Problem
Current lithium-ion batteries used in the automotive field pose safety risks due to the use of flammable organic solvents in their electrolytes, which can lead to overheating and fires in case of a short circuit.
Innovation Solution
An all-solid-state rechargeable battery manufacturing method that involves forming a laminate by stacking a solid electrolyte layer on a negative electrode, followed by a positive electrode, a gasket, and a finishing portion between the positive electrode and the gasket, eliminating the need for liquid electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flammable organic solvents are used in the electrolyte, then the battery can achieve practical use in information devices and communication devices, but safety deteriorates due to overheating and fire risks in case of short circuit
Solution Approach 1:
The patent extracts and removes the flammable organic solvent from the battery system by replacing it with a solid electrolyte. This eliminates the harmful fire risk while maintaining the battery's functional performance, directly resolving the safety contradiction.
Solution Approach 2:
The patent changes the physical state parameter of the electrolyte from liquid (organic solvent) to solid state. This parameter change fundamentally alters the safety characteristics by eliminating flammability while preserving ionic conductivity necessary for battery operation.
2Reliability
If a solid electrolyte layer is stacked on the negative electrode and positive electrode, then safety is improved by eliminating flammable solvents, but manufacturing complexity increases due to the stacking process
Solution Approach 1:
The battery is segmented into distinct layers (negative electrode, solid electrolyte layer, positive electrode) that can be manufactured separately and then stacked. This segmentation allows each component to be optimized independently while simplifying the overall assembly process through standardized stacking procedures.
Solution Approach 2:
The solid electrolyte layer is prepared in advance as a separate component before stacking. This preliminary preparation allows for quality control and optimization of the electrolyte layer independently, reducing manufacturing complexity during the final assembly process.
3Ease of manufacture
If gaps are present between the positive electrode and gasket, then assembly is easier, but energy density deteriorates due to wasted space
Solution Approach 1:
The finishing portion is applied locally at specific gaps between the positive electrode and gasket. This local application fills only the necessary spaces to eliminate voids while maintaining ease of assembly, thereby improving energy density without significantly complicating the manufacturing process.
Solution Approach 2:
The finishing portion uses inexpensive materials (such as conductive paste or filler material) to fill gaps. These materials are applied in small amounts only where needed, eliminating wasted space and improving energy density with minimal impact on manufacturing complexity.
Data Source
AI summary
An all-solid-state rechargeable battery manufacturing method includes forming a first laminate by stacking a first solid electrolyte layer on a first negative electrode, stacking a positive electrode on a first solid electrolyte layer of the first laminate, stacking a gasket at a distance from the positive electrode on the first solid electrolyte layer and forming a finishing portion in a gap between the positive electrode and the gasket.