Porous-Supported Fuel Cell Seal for Stable Automated Positioning
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Solution Overview
Problem
Existing fuel cell seals are difficult to handle and position due to their flexibility and large lateral dimensioning, leading to irregularities and errors in automated installation, and require complex multicomponent injection molding for production.
Innovation Solution
A cell seal design featuring a support portion made of porous material, such as a glass fiber fabric, that provides mechanical stability and connects with a sealing material to form a firm interlock, allowing for automated production and installation without the need for complex molding methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft polymer seal material is used to achieve effective sealing, then sealing performance is improved, but handling and positioning during automated installation becomes difficult
Solution Approach 1:
The seal comprises a composite structure with a soft polymer sealing material bonded to a rigid support structure (metal or plastic frame). This combination allows the soft material to provide effective sealing while the rigid frame provides dimensional stability and ease of handling during automated installation.
Solution Approach 2:
The seal is divided into two functional segments: a sealing material portion and a support structure portion. The sealing material (e.g., elastomer) provides the conforming sealing function, while the support structure (frame or backing plate) provides mechanical stability and positioning features for automated installation.
2Area of stationary object
If the seal lateral dimensions are increased to cover larger areas, then sealing coverage is improved, but irregularities form due to flexibility and production causes
Solution Approach 1:
The rigid support structure provides dimensional stability across large lateral dimensions, preventing irregularities that would otherwise form in a purely flexible seal material. The frame or backing plate maintains planarity and positioning accuracy during manufacturing and installation.
Solution Approach 2:
The support structure is designed with specific local features such as positioning protrusions, mounting holes, or rigidity-enhancing ribs at critical locations to maintain positioning accuracy and prevent irregularities in large-area seals without adding unnecessary weight or complexity throughout the entire seal.
3Ease of operation
If a plastic frame is added to provide mechanical stability, then handling is improved, but production complexity increases due to multicomponent injection molding
Solution Approach 1:
The support structure is designed with a porous or permeable configuration that allows the liquid or semi-liquid sealing material to penetrate and bond directly to the frame during a single injection molding process. This eliminates the need for separate bonding operations and reduces production complexity while maintaining mechanical stability.
Solution Approach 2:
The sealing material and support structure are combined into a single integrated component through direct injection molding, where the sealing material is injected and bonds to the pre-formed frame in one operation. This merging of components simplifies production while maintaining the handling advantages of the rigid frame.
4Strength
If a plastic frame is used to support the seal, then mechanical stability is improved, but attachment of sealing material to the frame becomes difficult and error-prone
Solution Approach 1:
The frame is designed with a porous structure that allows the liquid sealing material to penetrate into the frame during injection molding, creating a strong mechanical interlock and chemical bond. This porous configuration eliminates attachment difficulties and reduces errors by ensuring reliable bonding between the sealing material and support structure.
Solution Approach 2:
The combination of rigid frame material (plastic or metal) with the elastomeric sealing material creates a composite structure where the two materials are intimately bonded through direct injection. This composite approach ensures strong attachment while maintaining the mechanical stability provided by the rigid frame.
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 design enhances mechanical stability, reduces material usage, and simplifies production, enabling precise positioning and reduced costs, while maintaining effective sealing performance.
Implementation Method 1
The support portion comprises a porous material and is configured to impart a mechanical stability to the cell seal
Implementation Method 2
The sealing material of the seal portion penetrates the porous material at least partially and thus connects the seal portion to the support portion
Data Source
AI summary
A cell seal for a fuel cell having a support portion and a seal portion. The seal portion includes a sealing material to prevent passage of a fluid. The support portion includes a porous material, for example a fabric, and is configured to impart a mechanical stability to the cell seal. The sealing material of the seal portion penetrates the porous material at least partially and thus connects the seal portion to the support portion. In one version, the support portion is also used to connect different sealing regions mechanically to one another. A fuel cell having such a cell seal, wherein the cell seal is between two bipolar plates, and a method for producing the cell seal, are disclosed.