Membrane-Electrode Assembly Coated Sub-Gaskets for Gas Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for preventing hydrogen and oxygen penetration in polymer electrolyte membrane fuel cells using film-type sub-gaskets cause damage to electrodes, require multiple thicknesses of sub-gaskets, form steps that hinder workability, and create air gaps, reducing gas leakage prevention efficiency.
Innovation Solution
A membrane-electrode assembly with sub-gaskets having no or minimal steps, formed by direct coating of elastic materials, ensuring tight contact with electrodes and adjustable thicknesses, eliminating the need for heating and pressing, and allowing for mass production without damaging electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If film type sub-gaskets are laminated by heating and pressing, then gas leakage prevention function is improved, but electrodes are damaged
Solution Approach 1:
The patent replaces the mechanical heating and pressing method with a chemical bonding method. The sub-gasket includes a bonding layer that chemically bonds to the electrolyte membrane without requiring high temperature and pressure, thus preventing electrode damage while maintaining gas leakage prevention function.
Solution Approach 2:
The patent changes the bonding parameters from high temperature and pressure (conventional lamination) to low temperature and pressure (bonding layer method). The bonding layer enables effective bonding at conditions that do not damage the electrode, fundamentally altering the process parameters.
2Manufacturing precision
If multiple film thicknesses of sub-gaskets are prepared, then thickness adjustment is achieved, but device complexity increases
Solution Approach 1:
The patent segments the sub-gasket into two functional layers: a base layer providing structural support and gas leakage prevention, and a bonding layer providing adhesion to the electrolyte membrane. This segmentation allows thickness adjustment by varying the bonding layer thickness without changing the base layer, reducing the number of specifications needed.
Solution Approach 2:
The bonding layer serves multiple functions: providing adhesion to the electrolyte membrane, enabling thickness adjustment, and eliminating the need for heating and pressing. This multi-functionality simplifies the overall system by consolidating multiple requirements into a single component.
3Strength
If sub-gaskets are laminated by heating and pressing, then bonding strength is improved, but workability in subsequent processes deteriorates
Solution Approach 1:
The patent replaces mechanical heating and pressing with chemical bonding through the bonding layer. This substitution eliminates the formation of steps and air gaps, providing smooth surfaces that improve workability in subsequent processes while maintaining strong bonding through chemical adhesion.
4Reliability
If film type sub-gaskets are used, then gas leakage prevention is achieved, but air gaps are formed reducing effectiveness
Solution Approach 1:
The patent changes the bonding mechanism from mechanical pressing to chemical bonding. The bonding layer chemically adheres to the electrolyte membrane, ensuring uniform contact and eliminating air gaps that would reduce gas leakage prevention effectiveness.
Data Source
AI summary
A membrane-electrode assembly, a manufacturing method therefor, and a fuel cell comprising same are disclosed. The method for preparing a membrane-electrode assembly, of the present invention, comprises the steps of: forming a first electrode on a first surface of an electrolyte membrane; forming a first sub-gasket on the first surface of the electrolyte membrane by applying a first liquid material; forming a second electrode on a second surface of the electrolyte membrane; and forming a second sub-gasket on the second surface of the electrolyte membrane.