Electrolyser MEA Frame Assembly With Adhesive Overlap Bonding
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Solution Overview
Problem
Existing electrolyser designs face challenges with rigid components leading to difficult tight bends, disconnected areas, and complex manufacturing due to the rigidity of porous transport layers (PTLs) and frame members, resulting in poor electrical and thermal conduction, increased local degradation, and high costs.
Innovation Solution
A membrane electrode assembly (MEA) design featuring a catalyst coated membrane (CCM) with a frame member, porous transport layers (PTLs), and an adhesive layer, where the adhesive overlap section extends beyond the frame overlap section to ensure a reliable bond, reducing the need for additional adhesives and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid frame members and PTLs are used to withstand operational loads, then mechanical strength is improved, but the ability to form tight bends and connect components is worsened
Solution Approach 1:
The frame member is segmented into a first frame portion and a second frame portion that can be bent relative to each other at a bend region. This allows the frame to form tight bends while maintaining mechanical strength in the straight portions, resolving the contradiction between rigidity and bendability.
2Strength
If thick frame members are used to withstand operational loads, then mechanical strength is improved, but the distance bridging between PTL and CCM is worsened
Solution Approach 1:
The frame member is divided into bendable portions that can be folded or bent to reduce the effective distance between the PTL and CCM. This segmentation allows thick frame members to maintain strength while reducing the gap through geometric transformation rather than material thinning.
3Reliability
If multiple frame layers and adhesive layers are used to support components and avoid disconnected areas, then reliability is improved, but device complexity and manufacturing cost are worsened
Solution Approach 1:
The frame member integrates both structural support and connection functions into a single component. The bent configuration of the frame member directly bridges the PTL and CCM, eliminating the need for separate adhesive layers and multiple frame layers, thus reducing complexity while maintaining reliability.
Solution Approach 2:
The frame member serves multiple functions simultaneously: it provides mechanical strength, forms tight bends to bridge gaps, and creates direct connections between components. This multi-functionality reduces the number of separate components needed while maintaining connection reliability.
4Strength
If rigid PTLs are used to provide structural support, then mechanical strength is improved, but electrical and thermal conduction are worsened
Solution Approach 1:
The PTL is designed as a flexible, thin film structure that can be bent and folded. This flexibility allows the PTL to maintain intimate contact with the CCM, ensuring good electrical and thermal conduction while providing sufficient mechanical strength through its thin-film architecture rather than rigid bulk structure.
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
The MEA design ensures even electrical and thermal conduction, reduces chemical degradation, and simplifies manufacturing by minimizing disconnected areas and reducing the number of components, thereby improving durability and lowering costs.
Implementation Method 1
an adhesive layer (150), which bonds the frame member (140) and the at least one porous transport layer (121, 122) to the CCM member (110)
Implementation Method 2
two porous transport layers (PTL). Each of the PTLs is arranged on one of the membrane sides, forming a diffusor structure for surface distribution and/or collection of fluid process streams
Implementation Method 3
a catalyst coated membrane (CCM) member (110), which forms an electrochemically active core unit of the membrane electrode assembly. The CCM member comprises a polymer membrane (111), which forms a solid electrolyte for exchange of ions
Implementation Method 4
Hydrogen can be produced in electrolysers through electrolysis of water, a process, where water is split into hydrogen and oxygen by using electricity
Implementation Method 5
The CCM member further comprises one or more catalyst coatings (112, 113), each of which is receptive to electrons
Data Source
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AI summary
The present invention relates to a membrane electrode assembly (100) for a stackable electrolyser cell. The membrane electrode assembly (100) comprises a catalyst coated membrane (CCM) member (110) with a polymer membrane (111) that is at least partially coated with a catalyst coating (112, 113), a frame member (140) for mechanical reinforcement, two porous transport layers (121, 122), and an adhesive layer (150). The adhesive layer (150) forms an adhesive bond between the CCM member (110) and at least the frame member (140) and further, comprises an adhesive overlap section (151) that overlaps with a frame overlap section (141) of the frame member (140). The adhesive overlap section (151) extends inwardly with respect to the peripheral area (115) beyond the frame overlap section (141) to delimit a process area (116) of the CCM member (110). The invention relates further to a solid polymer electrolyte electrolyser cell stack with such membrane electrode assembly (100) and a method of manufacturing said membrane electrode assembly (100).