Integrated Fuel Cell Unit Cell With Adhesive Frame Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing fuel cell unit cells, such as the use of elastomer frames joined by hot pressing, often result in damage to the membrane-electrode-gasket assembly, deformation of the elastomer frame, and inadequate junctions between separators and elastomer frames, leading to alignment issues in fuel cell stacks. Additionally, these methods increase cell assembly tolerances and make it difficult to replace defective cells within the stack.
Innovation Solution
An integrated unit cell design where an insert comprising a membrane electrode assembly and gas diffusion layers is integrated with separators using a three-dimensional frame. The frame is joined to the insert and separators using adhesive members, forming a secure and airtight structure without the need for additional sealing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot pressing is used to join elastomer frame with membrane-electrode-gasket assembly, then joining is achieved, but membrane-electrode-gasket assembly is damaged or elastomer frame is deformed
Solution Approach 1:
The patent replaces the mechanical hot pressing system with a chemical bonding system using adhesives. The adhesive members are applied to join the elastomer frame with the membrane-electrode-gasket assembly and separators without applying heat and pressure, thus avoiding damage and deformation while achieving reliable joining.
2Strength
If hot pressing is used to join separator with elastomer frame, then joining is achieved, but junction quality is insufficient leading to alignment issues
Solution Approach 1:
The patent replaces hot pressing with adhesive bonding for joining separators with the elastomer frame. This chemical bonding method provides better junction quality and maintains alignment precision without the heat and pressure-induced deformation that compromises manufacturing precision.
3Quantity of substance
If membrane-electrode-gasket assembly is used to reduce costs, then material cost is reduced, but cell assembly tolerances increase
Solution Approach 1:
The elastomer frame acts as an intermediary component that provides precise positioning and alignment for the membrane-electrode-gasket assembly and separators. This intermediary structure enables cost-effective assembly while maintaining tight cell assembly tolerances through the frame's geometric precision and adhesive bonding.
4Productivity
If unit cells are stacked to manufacture fuel cell stack, then productivity is increased, but alignment of unit cells deteriorates
Solution Approach 1:
The elastomer frame serves multiple functions simultaneously: it provides structural support, ensures airtight sealing, maintains precise alignment, and facilitates easy replacement of defective cells. This multi-functional design enables high productivity through standardized assembly while maintaining consistent unit cell alignment across the stack.
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 reduces cell assembly tolerance, ensures airtightness without separate sealing members, prevents electrical shorts and corrosion, reduces material costs, and facilitates easier replacement of defective cells, thereby enhancing fuel cell stack productivity.
Implementation Method 1
joined to any one of opposite surfaces of the periphery of the insert by an adhesive member at an interface thereof
Data Source
AI summary
An embodiment integrated unit cell for a fuel cell stack includes an insert constructed with a membrane electrode assembly and a pair of gas diffusion layers disposed on opposite surfaces of the membrane electrode assembly, a frame having a form of a sheet, the frame being disposed to surround a periphery of the insert in an outer boundary region of the insert and joined to any one of opposite surfaces of the periphery of the insert by a first adhesive member at an interface thereof, and a pair of separators disposed on opposite surfaces of the frame, respectively, and joined to the opposite surfaces of the frame by second adhesive members.