Fuel Cell Separator with Integrated Gasket Injection
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Solution Overview
Problem
Conventional separator manufacturing for fuel cells faces interference issues between conductive surface treatment and gasket cross-linking, leading to defects, increased costs, and physical damage during deburring, which affects the quality and productivity of the separator.
Innovation Solution
A separator design featuring a metal plate with integrated gaskets and a bonding unit, where the metal plate and frames with gaskets are separately produced and assembled, eliminating the need for direct gasket injection and deburring, thus preventing process interference and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator surface is provided with a gasket using a rubber seal to ensure air tightness, then gas tightness is improved, but process interference occurs between conductive surface treatment and gasket cross-linking
Solution Approach 1:
The separator is divided into distinct functional regions: a metal plate body, separate frame structures, and integrated gaskets. This segmentation allows the gasket to be formed separately from the metal plate, eliminating process interference between conductive surface treatment of the metal plate and rubber cross-linking of the gasket.
Solution Approach 2:
The gasket is pre-formed by injection molding before being assembled to the metal plate. This preliminary formation of the gasket separates the rubber processing steps from the metal plate surface treatment steps, allowing each component to be manufactured and treated independently without process interference.
2Strength
If the separator is exposed to high temperature for gasket cross-linking, then gasket bonding is improved, but conductive surface treatment is interfered with
Solution Approach 1:
By segmenting the separator into a metal plate and separate frame/gasket components, the high-temperature cross-linking process is applied only to the gasket and frame assembly, not to the metal plate surface. This protects the conductive surface treatment on the metal plate from thermal damage.
Solution Approach 2:
The frame structure acts as an intermediary component that connects the metal plate to the gasket. This intermediary allows the gasket to be bonded to the frame (which can withstand high temperature), while the metal plate with its sensitive conductive surface treatment remains separate and protected from the high-temperature cross-linking process.
3Manufacturing precision
If deburring is performed to remove escaped gasket material, then injection defects are removed, but physical damage to the separator surface occurs
Solution Approach 1:
The invention converts the potential harm of gasket material escape by designing the frame structure with integrated gaskets that are precisely contained. The frame acts as a built-in constraint that prevents gasket material from escaping during injection, eliminating the need for deburring and the associated surface damage risk.
Solution Approach 2:
The frame structure is designed beforehand to provide containment boundaries for the gasket during injection. This preliminary structural design prevents gasket material from escaping to the separator surface, cushioning against the need for subsequent deburring operations that could cause surface damage.
4Reliability
If multiple processes are performed to manufacture the separator, then functional requirements are met, but productivity decreases
Solution Approach 1:
The frame and gasket are merged into a single integrated component formed by injection molding. This merging eliminates separate manufacturing steps for attaching the gasket to the frame, reducing the total number of processes required and improving manufacturing efficiency while maintaining all necessary functions.
Solution Approach 2:
The frame structure serves multiple functions simultaneously: it provides structural support, contains the gasket during injection, and bonds to both the metal plate and gasket. This multi-functionality reduces the need for separate components and assembly steps, thereby improving productivity.
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 approach enhances the stability and quality of the separator, reduces manufacturing costs, and increases productivity by avoiding defects and pollution, ultimately improving the overall quality of the fuel cell system.
Implementation Method 1
a bonding unit for integratedly bonding the frames to the metal plate
Implementation Method 2
the integrated gasket 502 of the separator 500 is formed by performing integrated gasket injection on the surface of the separator 500 under a condition of an edge of the separator 500 being held by a gasket injection mold under pressure
Implementation Method 3
The separator 500 having the integrated gasket 502 should be exposed to a temperature of 200° C. or higher for a long period of time so as to cross-link a gasket material
Data Source
AI summary
A separator for a fuel cell includes a metal plate which defines a passage and a manifold, frames having gaskets which are integrated therewith using injection, and a bonding unit for bonding the frames to the metal plate. The gaskets may be differently formed. This resolves process interference problems between conductive surface treatment and gasket cross-linking, obviates deburring of the gasket, and preventes poor injection of the gaskets, which ensures stable quality of the separator, increases productivity and decreases the manufacturing cost.