Membrane Electrode Assembly Frame with Adhesive Layer
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Solution Overview
Problem
In frame-equipped membrane electrode assemblies, the exposure of the electrolyte membrane at joint parts can lead to damage due to expansion or contraction when humidified or dried, as the membrane is not fixedly positioned.
Innovation Solution
A frame-equipped membrane electrode assembly is designed with a resin sheet frame member that encases the electrolyte membrane's outer periphery, using an adhesive layer to join the inner peripheral portion of the resin sheet with the electrolyte membrane, ensuring the membrane is protected from exposure and damage during humidity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrolyte membrane is joined to the resin frame member at the joint part, then the membrane electrode assembly structure is formed, but the electrolyte membrane is exposed at the gap and not fixedly positioned, leading to potential damage during expansion or contraction
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary substance between the electrolyte membrane and the resin frame member. This adhesive layer fills the gap that would otherwise expose the membrane, providing both chemical bonding and physical filling protection. The adhesive mediator ensures the membrane is fully covered and fixedly positioned while accommodating expansion and contraction without exposure.
2Quantity of substance
If the electrolyte membrane is made thinner to reduce cost, then the quantity of expensive solid polymer electrolyte membrane is reduced, but the membrane strength decreases and becomes more vulnerable to damage
Solution Approach 1:
The patent applies beforehand cushioning by providing the adhesive layer in advance before the membrane undergoes expansion or contraction during operation. The adhesive layer is pre-applied to the frame member and membrane, creating a protective bond that cushions the thin membrane against mechanical stress and prevents damage during humidity changes and operational cycles.
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 configuration effectively prevents exposure of the electrolyte membrane, reducing the risk of damage from expansion or contraction, thereby enhancing the durability and reliability of the fuel cell.
Implementation Method 1
an outer peripheral portion of the electrolyte membrane (18) is disposed between the cathode (22) and the resin sheet (24a), stacked on an outer peripheral portion of the cathode (22), and joined to an inner peripheral portion of the resin sheet (24a) through an adhesive layer (24c)
Data Source
AI summary
A frame equipped membrane electrode assembly includes a membrane electrode assembly and a frame member having a first frame shaped sheet provided on an outer peripheral portion of the membrane electrode assembly over the entire periphery. An outer peripheral portion of an electrolyte membrane is provided between a cathode and the first frame shaped sheet, stacked on an outer peripheral portion of the cathode, and joined to an inner peripheral portion of the first frame shaped sheet through an adhesive layer. The adhesive layer is filled in an area surrounded by an inner peripheral end of the first frame shaped sheet, an anode, and the electrolyte membrane.