Fuel Cell Membrane Electrode Frame Assembly for Roll-to-Roll Sealing
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Solution Overview
Problem
Existing manufacturing processes for membrane electrode and frame assemblies (MEFAs) with integrated sealing functionality face challenges in high-volume production, including reduced manufacturing speed and increased risk of damage or misalignment during roll-to-roll processing.
Innovation Solution
The membrane electrode and frame assembly design incorporates a catalyst coated membrane assembly, gas diffusion layers, and a frame with a sealing section, where two adhesive layers are used to bond the components together, allowing for roll-to-roll processing and integration of sealing functionality without additional post-processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing functionality is added to the frame design, then sealing performance is improved, but manufacturing complexity increases and manufacturing speed decreases
Solution Approach 1:
The patent combines the sealing function with the frame structure by providing a frame that extends between inner and outer perimeters and includes an integrated sealing section. This merging of the sealing function into the frame eliminates the need for separate sealing components and reduces assembly steps, thereby maintaining manufacturing speed while improving sealing performance.
Solution Approach 2:
The frame is designed to perform multiple functions simultaneously: it provides mechanical support, electrical isolation, mechanical alignment, and sealing functions through its integrated sealing section. This multi-functionality reduces the number of separate components needed and simplifies the manufacturing process.
2Reliability
If multiple adhesive layers are used to bond components, then bonding reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the bonding function into two distinct adhesive layers: a first adhesive layer bonding the catalyst coated membrane assembly to the first gas diffusion layer, and a second adhesive layer bonding the catalyst coated membrane assembly to the frame. This segmentation allows each adhesive layer to be optimized for its specific bonding task, improving overall bonding reliability while maintaining clear manufacturing instructions.
3Productivity
If roll-to-roll manufacturing is used, then manufacturing speed is improved, but manufacturing precision decreases due to handling of thin materials
Solution Approach 1:
The patent employs thin film adhesive layers that can be applied continuously in roll-to-roll manufacturing. These flexible adhesive films accommodate the handling requirements of thin materials while enabling high-speed continuous processing, thus maintaining both manufacturing speed and sufficient precision.
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 enables increased manufacturing speed and reduced production costs by allowing high-volume production of MEFAs with integrated sealing functionality, while maintaining the structural integrity of the fuel cell stack.
Implementation Method 1
The membrane electrode and frame assembly comprises a first adhesive layer and a second adhesive layer, each adhesive layer extending between an inner perimeter and an outer perimeter. The first adhesive layer and the second adhesive layer are bonded to opposite sides of the catalyst coated membrane assembly.
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a membrane electrode and frame assembly (10) for a solid polymer electrolyte fuel cell stack, which comprises a catalyst coated membrane assembly (11), an anode gas diffusion layer and a cathode gas diffusion layer located and a frame (13) for carrying the catalyst coated membrane assembly (11), the frame (13) having a sealing section (135) for providing a sealing function. Two adhesive layers (141, 142) are provided that are bonded to opposite sides of the catalyst coated membrane assembly (11). A first adhesive layer (141) bonds one of the gas diffusion layers (121) to the catalyst coated membrane assembly (11). A second adhesive layer (142) bonds the frame (13) and the other of the gas diffusion layers (122) to the catalyst coated membrane assembly (11). For this, the second adhesive layer (142) comprises at least one connection section (1423) at its inner perimeter (1421) that extends beyond the inner perimeter (131) of the frame (13) to bond the other of the gas diffusion layers (122) to the catalyst coated membrane assembly (11). The invention further relates to a solid polymer electrolyte fuel cell stack, which comprises a series stack of a plurality of said membrane electrode and frame assemblies (10), and to a method of manufacturing said membrane electrode and frame assembly (10).