Fuel Cell Humidifier Membrane Stack With Spacer-Bonded Protective Layers
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Solution Overview
Problem
The challenge in existing membrane stacks for fuel cell humidifiers is the instability and delamination of membrane materials from protective layers due to poor bonding, leading to leakage and inefficiency in humidity exchange.
Innovation Solution
The solution involves attaching a protective layer to the spacers instead of the membrane, ensuring a stable connection by bonding the spacers and protective layers directly at specific edges, using materials like PET or PPS for the protective layer and plastic for the spacers, with different structures for the spacers to adapt to air flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective layer is bonded to the membrane material, then the membrane material is protected from tearing and abrasion, but delamination occurs due to bonding difficulty and insufficient material thickness
Solution Approach 1:
The patent inverts the conventional bonding arrangement by bonding the protective layer to the spacer instead of to the membrane material. The spacer acts as an intermediate carrier that is easily bondable to the protective layer, while the membrane material remains in direct contact with the flow channels. This inversion eliminates the bonding difficulty between dissimilar materials (protective layer and membrane) while maintaining protection functionality.
Solution Approach 2:
The spacer serves as an intermediary element between the protective layer and the membrane material. The protective layer is bonded to the spacer, which then provides structural support and positioning for the membrane material. This intermediary approach allows each component to be optimized for its specific function without the complications of direct bonding between incompatible materials.
2Loss of substance
If the protective layer is made thin to reduce material usage, then manufacturing cost decreases, but the connection becomes unstable and delamination occurs
Solution Approach 1:
By inverting the bonding arrangement and attaching the protective layer to the spacer rather than the membrane, the system can use thinner protective layers without compromising connection stability. The spacer provides a robust bonding substrate that compensates for the reduced thickness of the protective layer, maintaining reliability while reducing material consumption.
3Device complexity
If the membrane material and protective layer are bonded directly, then the structure is simplified, but delamination leads to leakage of the membrane stack
Solution Approach 1:
The spacer acts as a mediator that prevents direct bonding between the protective layer and membrane material, eliminating the delamination risk. The three-component structure (protective layer-bonded-to-spacer-membrane assembly) provides reliable connections while maintaining functional simplicity in the overall device operation.
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 design prevents delamination and leakage, ensuring a secure and permanent connection, enhancing the efficiency and durability of the membrane stack.
Implementation Method 1
The membranes of the membrane stack are made of a material which is permeable to water vapor and airtight
Implementation Method 2
the respective protective layer and the respective first spacer adjacent to the respective protective layer are connected to each other in sections at the edges and are directly bonded to each other. Preferably, the respective protective layer and the respective first spacer adjacent to the respective protective layer are welded or bonded to one another
Data Source
AI summary
A membrane stack for a fuel cell humidifier includes water vapor-permeable, airtight membranes spaced apart in a stack with alternating first and second spacers. The stack enables cross-flow of humid exhaust and dry supply air. Each first spacer is separated from the adjacent membrane by a protective layer, with both connected in a direct, material-locking manner.