Multi-Layer Electrode Casing with Integrated Current Collector
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Solution Overview
Problem
The manufacture of electrochemical cells, such as batteries, is complex and capital-intensive, often requiring binding agents that occupy space, impede conductivity, and increase processing complexity, while existing packaging methods do not effectively utilize materials as both casing and current collectors.
Innovation Solution
A multi-layer sheet is used as both the casing and current collector for electrochemical cells, comprising an outer layer, an intermediate conductive layer, and an inner layer with openings to expose the conductive region, allowing for direct electrical connection of the electrode material and simplifying the manufacturing process by eliminating the need for separate tabbing and sealing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binding agents are used to compress components into a cohesive assembly, then structural integrity is improved, but device complexity and processing complexity increase
Solution Approach 1:
The patent removes the binding agent from the electrode structure, extracting the problematic component that caused complexity. The electrode is formed as a self-supporting mesh structure without requiring additional binding materials to hold components together.
Solution Approach 2:
The conductive substrate and current collector functions are merged into a single integrated component. The mesh structure serves both as the structural framework and as the conductive pathway, eliminating the need for separate binding agents and current collector layers.
2Reliability
If binding agents are used to ensure conductive networks are in place, then electrical connection is improved, but ionic and electronic conductivity are impeded
Solution Approach 1:
The binding agent is completely removed from the electrode construction. Instead of using binding materials to ensure conductive networks, the patent relies on the inherent conductivity of the mesh structure and direct contact between active material particles and the conductive substrate.
Solution Approach 2:
The electrode uses a porous mesh structure that allows efficient ion transport while maintaining electrical conductivity. The open framework provides pathways for both ionic and electronic movement without the blocking effect of binding agents.
3Stability of the object's composition
If binding agents are used to compress components, then structural cohesion is improved, but space utilization is reduced
Solution Approach 1:
The binding agent volume is eliminated entirely. The electrode achieves structural cohesion through the mechanical integrity of the mesh framework and the adhesion of active material to the substrate, requiring no additional space-consuming binding materials.
4Reliability
If separate tabbing and sealing operations are performed, then electrical connection and packaging are achieved, but manufacturing complexity increases
Solution Approach 1:
The current collector, tab, and sealing structures are merged into the multi-layer sheet assembly. The conductive substrate extends to form integrated tabs that protrude from the electrode, eliminating the need for separate tabbing operations. The same multi-layer structure provides both electrical connection and packaging functions.
Solution Approach 2:
The multi-layer sheet serves multiple functions simultaneously: it acts as the current collector, provides structural support, forms the electrode housing, and creates sealing barriers. This multi-functionality reduces the number of discrete manufacturing steps required.
Data Source
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Figure 3
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AI summary
Electrochemical cells and methods of making electrochemical cells are described herein. In some embodiments, an apparatus includes a multi-layer sheet for encasing an electrode material for an electrochemical cell. The multi-layer sheet including an outer layer, an intermediate layer that includes a conductive substrate, and an inner layer disposed on a portion of the conductive substrate. The intermediate layer is disposed between the outer layer and the inner layer. The inner layer defines an opening through which a conductive region of the intermediate layer is exposed such that the electrode material can be electrically connected to the conductive region. Thus, the intermediate layer can serve as a current collector for the electrochemical cell.