Wound All-Solid-State Battery Layout Without Via Holes
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Solution Overview
Problem
All-solid-state batteries face challenges in maximizing space utilization, capacitance, and reducing resistance losses due to the limitations of traditional liquid electrolyte-based lithium secondary batteries, particularly in the manufacturing of circular batteries where via holes reduce capacitance and require high-temperature sintering processes.
Innovation Solution
The design involves a laminate structure with a solid electrolyte layer, negative, and positive electrode layers stacked around an insulating member, eliminating the need for via electrodes, allowing the electrodes to be wound in a cylindrical shape with terminals connected directly, thereby increasing capacitance and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a via electrode is used to connect positive and negative electrodes in a circular battery, then electrical connection is achieved, but space utilization decreases due to wasted space from via holes
Solution Approach 1:
The invention extracts and eliminates the via electrode component from the battery structure. By removing the via hole and via electrode, the patent achieves direct electrical connection between positive and negative electrodes through the wound laminate configuration, thereby eliminating wasted space while maintaining reliable electrical connection.
Solution Approach 2:
Instead of creating holes through the electrodes to establish connections (conventional approach), the patent inverts the approach by winding the laminate around a cylindrical mandrel, allowing electrode ends to naturally align and connect at the outer circumference, thus eliminating via holes and improving space utilization.
2Stability of the object's composition
If high-temperature sintering is performed for ceramic-based solid electrolyte manufacturing, then electrolyte stability is improved, but manufacturing complexity increases due to shrinkage control requirements
Solution Approach 1:
The patent applies preliminary action by forming a porous green body structure before sintering, with pre-designed margins and spacing that account for expected shrinkage during high-temperature sintering. This preliminary configuration allows the final sintered product to achieve the desired dimensions and stability without requiring complex real-time shrinkage control during manufacturing.
3Reliability
If via holes are created for electrode connection, then electrical connectivity is established, but capacitance decreases due to reduced active material area
Solution Approach 1:
The invention extracts and eliminates the via hole structure that was removing active material area. By eliminating via holes and using the wound laminate configuration with direct electrode contact at the outer circumference, the patent maximizes the area of active material that can contribute to capacitance while maintaining electrical connectivity.
Data Source
AI summary
An all-solid-state battery includes a electrode assembly including a laminate comprising a solid electrolyte layer, and a negative electrode layer and a positive electrode layer stacked with the solid electrolyte layer interposed therebetween, and an insulating member, the laminate being wound around the insulating member in such a manner that one surface of the negative electrode layer and/or the positive electrode layer is parallel to a central axis of the insulating member in a stacking direction thereof, a negative terminal connected to the negative electrode layer, and a positive terminal connected to the positive electrode layer. When a direction of the central axis of the insulating member is a third direction, the negative terminal is disposed on one surface of the electrode assembly in the third direction, and the positive terminal is disposed on the other surface of the electrode assembly in the third direction.