Two-Part Sealant Bonding for Fuel Cell Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for bonding and sealing fuel cell components are inefficient, as they often involve time-consuming processes, material degradation, contamination, and misalignment issues, leading to performance losses and reduced operating lifetimes.
Innovation Solution
A two-part sealant system is introduced, where one part contains an initiator and the other a polymerizable material, which are applied to fuel cell components and cured using actinic radiation, such as UV light, to form a bonded assembly, allowing for efficient and precise sealing of fuel cell components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid silicone rubber is molded onto fuel cell components, then sealing is achieved, but the material degrades before the desired operating lifetime and releases contaminating materials
Solution Approach 1:
The patent changes the chemical composition parameters of the sealant from traditional silicone rubber to a fluorinated polymer composition containing perfluorinated chains and crosslinking agents. This parameter change provides both the required sealing durability and resistance to degradation throughout the fuel cell's operating lifetime, while eliminating contaminant release.
Solution Approach 2:
The patent employs a composite sealant formulation combining perfluorinated polymer chains with crosslinking agents and initiators. This composite structure provides enhanced chemical stability, thermal resistance, and mechanical durability, resolving the contradiction between achieving reliable sealing and preventing material degradation over time.
2Duration of action of stationary object
If durable elastomers such as fluoroelastomers are used to bond fuel cell components, then operating lifetime is increased, but the bonding process becomes time-consuming as each element must be individually bonded
Solution Approach 1:
The patent segments the sealant application into two separate components: a Part A containing the fluorinated polymer and crosslinking agents, and a Part B containing the initiator. This segmentation allows each part to be applied independently to different components, which are then assembled and bonded simultaneously through a single curing process, dramatically increasing productivity while maintaining durability.
Solution Approach 2:
The patent applies Part A of the sealant to one component and Part B to another component before assembly. This preliminary action allows the sealant components to be pre-positioned on separate parts, enabling rapid bonding upon assembly without requiring time-consuming individual bonding operations, thus resolving the contradiction between durability and productivity.
3Reliability
If adhesive and gasket placement methods are used to seal fuel cell components, then sealing is achieved, but misalignment may cause leakage and the process is time-consuming
Solution Approach 1:
The patent merges the sealing function and bonding function into a single integrated sealant composition. The same fluorinated polymer-based sealant that provides durable sealing also acts as the bonding adhesive between components. This eliminates the need for separate gasket placement and adhesive application steps, reducing alignment time and preventing leakage through a unified sealing-bonding system.
Solution Approach 2:
The patent changes the functional parameters of the sealant from a single-function material to a multi-functional composition that simultaneously provides sealing, bonding, and alignment tolerance. The fluorinated polymer formulation maintains viscosity and curing characteristics that allow for self-alignment and compensation, reducing placement time while ensuring reliable sealing without leakage.
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 method enables rapid, precise, and durable bonding and sealing of fuel cell components, reducing the risk of leakage and performance losses, while improving the operational lifetime of fuel cell assemblies.
Implementation Method 1
A two-part sealant system is introduced, where one part contains an initiator and the other a polymerizable material, which are applied to fuel cell components and cured using actinic radiation, such as UV light, to form a bonded assembly
Data Source
Figure 1~2
Figure 3~4
AI summary
A method for forming a fuel cell component includes the steps of providing a two-part sealant having a first part comprising an initiator and a second part comprising a polymerizable material; applying the first part of the sealant to a substrate of a first fuel cell component; applying the second part of the sealant to a substrate of a second fuel cell component; juxtaposingly aligning the substrates of the first and second fuel cell components; and curing the sealant to bond the first and second fuel components to one and the other. The initiator may be an actinic radiation initiator, whereby the sealant is cured by actinic radiation. The polymerizable material may be a polymerizable monomer, oligomer, telechelic polymer, functional polymer and combinations thereof. Desirably, the functional group is epoxy, allyl, vinyl, acrylate, methacrylate, imide, amide, urethane and combinations thereof. Useful fuel cell components to be bonded include a cathode flow field plate, an anode flow field plate, a resin frame, a gas diffusion layer, an anode catalyst layer, a cathode catalyst layer, a membrane electrolyte, a membrane-electrode-assembly frame, and combinations thereof.