Multi-Layer Fuel Cell Seal for Corrosion-Resistant Gas Sealing
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Solution Overview
Problem
Existing fuel cell systems face challenges in achieving effective internal sealing, particularly in severe application conditions such as acidic or corrosive environments, where traditional seals may fail to prevent leakage and intermixing of reactant and coolant gases.
Innovation Solution
A multi-layer seal is introduced, comprising multiple sealing layers with varying materials and bonding strengths, applied using different processes such as formed-in-place gasket, room temperature vulcanizing, or dispensing. This seal is designed to be impermeable to reactant gases and coolants while offering enhanced corrosion resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-layer seals are used in fuel cell systems, then the device complexity is low and manufacturing is simple, but the seals fail to provide adequate corrosion resistance and gas impermeability in severe application conditions
Solution Approach 1:
The patent applies composite materials by combining multiple sealing layers with different material properties. The first layer uses a material that is effectively impermeable to reactant gas and coolant, while the second layer uses a material with superior corrosion resistance. This composite structure allows each layer to contribute its specific advantages, achieving both gas impermeability and corrosion resistance that neither single material could provide alone.
Solution Approach 2:
The seal is segmented into multiple distinct layers, each performing a specific function. The first layer is dedicated to gas and coolant impermeability, while the second layer is dedicated to corrosion resistance. This segmentation allows for optimized material selection and application processes for each layer, rather than requiring a single material to satisfy all requirements simultaneously.
2Reliability
If multiple sealing layers with different materials are used, then corrosion resistance and gas impermeability are improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by using a formed-in-place gasket (FIPG) process for the first layer, which is pre-formed and then cured in place before applying the second layer. This sequencing allows the first layer to be properly established and bonded to the substrate before the second layer is applied, simplifying the overall manufacturing process compared to attempting to apply multiple layers simultaneously or in reverse order.
Solution Approach 2:
The patent employs different application processes suited to each layer's requirements. The first layer can be applied using FIPG, RTV sealant, or dispensing processes, while the second layer uses materials that cure at room temperature or with minimal heating. This flexibility in process parameters allows for optimized manufacturing despite the multi-layer complexity.
3Ease of manufacture
If adjacent sealing layers are made of the same material, then the manufacturing process is simplified, but the overall sealing performance and corrosion resistance are reduced
Solution Approach 1:
The patent applies local quality by assigning different material properties to different layers based on their specific functional requirements. The first layer uses a material optimized for gas and coolant impermeability, while the second layer uses a material specifically selected for superior corrosion resistance. This localized optimization of material properties ensures that each layer performs its designated function effectively, rather than using a compromise material that attempts to satisfy all requirements equally.
Data Source
AI summary
A fuel cell stack includes end plate units each having a metal plate, a dielectric plate, and a perimeter groove defined by the dielectric plate and an edge of the metal plate. The stack also includes a gas inlet and a coolant inlet configured to receive a reactant gas and coolant into the fuel cell stack, respectively, fuel cells having a pair of bipolar plates, and a multi-layer seal disposed within the fuel cell stack on the end plate units or the bipolar plates. The multi-layer seal includes a first layer constructed of a first material that is substantially impermeable to the reactant gas, and a second layer constructed of a second material that is more resistant to corrosion than is the first material.