Electrolytic Cell Fixture for Uniform SEI Formation Pressure
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Solution Overview
Problem
Conventional methods for applying pressure to electrolytic cells during solid-electrolyte-interface (SEI) layer formation are complex and non-uniform, leading to variations in cell performance and life span due to mechanical presses that do not apply pressure uniformly across cell surfaces.
Innovation Solution
A fixture that sealingly holds cells in a pressurizable volume, allowing a fluid to apply uniform pressure without mechanical contact, while keeping terminals exposed to ambient atmosphere, enabling uniform pressure application to all cell surfaces except terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical presses are used to apply pressure to cells during SEI layer formation, then pressure can be applied to improve SEI layer structure and cell performance, but the pressure is not applied uniformly to cell surfaces, leading to variations in cell performance
Solution Approach 1:
The patent replaces the mechanical press system with a fluid pressure system. Instead of using mechanical presses with platens and guiding pillars, the invention uses a sealed chamber that introduces pressurized gas or liquid to apply uniform pressure to all cell surfaces simultaneously. This substitution eliminates the mechanical contact points that caused non-uniform pressure distribution, achieving consistent pressure application across all cells without the complexity of mechanical pressing mechanisms.
Solution Approach 2:
The patent employs pneumatic or hydraulic pressure to achieve uniform compression of cells during SEI layer formation. A sealed chamber contains the cells and introduces pressurized fluid (gas or liquid) that distributes pressure uniformly across all cell surfaces. This approach leverages the inherent ability of fluids to transmit pressure evenly in all directions, eliminating the non-uniform pressure distribution problems associated with mechanical presses while maintaining the necessary compression force for improved cell performance.
2Force
If mechanical presses with guiding pillars and drives are used, then pressure can be applied to cells, but the device complexity increases due to multiple components required
Solution Approach 1:
The patent replaces the complex mechanical press system comprising guiding pillars, drives, and multiple mechanical components with a simple sealed chamber and fluid pressure source. This substitution maintains the essential force application capability while dramatically reducing structural complexity. The fluid pressure system requires only a sealable chamber and pressure introduction mechanism, eliminating the need for complex mechanical guiding and actuation systems.
Solution Approach 2:
The patent extracts and removes the unnecessary mechanical components (guiding pillars, complex drives, multiple mechanical linkages) from the pressure application system. By retaining only the essential function of applying pressure through a sealed chamber with fluid introduction, the invention simplifies the overall device structure while maintaining effective pressure application capability for cell formation.
3Manufacturing precision
If cells are held in a sealable volume for fluid pressure application, then uniform pressure can be applied to cell surfaces, but the terminals must be exposed to ambient atmosphere, requiring selective sealing
Solution Approach 1:
The patent segments the sealing requirement into two distinct zones: a sealed chamber volume for applying uniform pressure to cell surfaces, and an unsealed terminal area for electrical contact and ventilation. The sealing structure is designed to enclose only the portion of cells requiring pressure application while leaving terminal ends exposed. This segmentation allows simultaneous achievement of uniform pressure distribution across cell bodies and accessible terminal connections without requiring complete enclosure of the cell assembly.
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 solution ensures consistent and enhanced SEI layer formation, improving cell performance and life span by applying uniform pressure to electrolytic cells during the formation process.
Implementation Method 1
a fixture that sealingly holds a plurality of cells in spaced relationship to define a pressurizable volume or chamber into which a fluid can be introduced under pressure. The pressurized fluid applies a uniform pressure to surfaces of the cells without mechanical contact with the cells
Data Source
AI summary
Apparatus and method for forming solid-electrolyte-interface layers on electrodes of a plurality of electrolytic cells involves use of a cell formation fixture configured to define a scalable and pressurizable volume containing the electrolytic cells, while exposing terminals of the cells to ambient atmospheric pressure.