Integrated Fuel Cell Endplate with Venturi Gas Ejector
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Solution Overview
Problem
Fuel cell endplates face challenges in maintaining optimal pressure and fluid management within fuel cell stacks, leading to inefficiencies in gas circulation and heat exchange, which can result in fluid leakages and reduced electrical conductivity.
Innovation Solution
The integration of fluid channels and ports within the endplates for anode feed gas, anode exhaust, cathode feed gas, and cathode exhaust conduits, along with a gas ejector system that utilizes a Venturi tube and orifice plate to circulate anode exhaust gas, ensuring proper pressure control and gas mixing, and the use of coolant channels for enhanced heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional endplates with separate components are used, then manufacturing and assembly are simpler, but fluid management efficiency and pressure control are insufficient
Solution Approach 1:
The patent combines multiple endplate functions (fluid distribution, pressure control, electrical connection, thermal management) into a single integrated endplate component. The endplate includes internally formed fluid channels, integrated gas ejectors with Venturi tubes, cooling channels, and electrical contact surfaces, eliminating the need for separate manifolds, valves, and connectors that would otherwise be required.
Solution Approach 2:
The endplate serves multiple functions simultaneously: it distributes reactant gases to fuel cells through internal channels, controls pressure using integrated gas ejectors with Venturi tubes, provides thermal management via cooling channels, and establishes electrical connections. This multi-functionality reduces the number of components while improving system efficiency.
2Productivity
If gas ejector system with Venturi tube is integrated, then gas circulation and pressure control improve, but device complexity increases
Solution Approach 1:
The gas ejector system is integrated directly into the endplate structure, with the Venturi tube, motive gas inlet, and suction gas inlet channels formed as part of the endplate itself. This integration eliminates separate ejector housings and connections, reducing overall system complexity while maintaining the pressure control and gas circulation functions.
Solution Approach 2:
The patent uses pneumatic principles through the Venturi tube design, where motive gas flowing through the constricted section creates a pressure differential that draws in suction gas (anode exhaust). This passive pneumatic mechanism enables automatic pressure control and gas circulation without requiring mechanical moving parts or external control systems.
3Temperature
If integrated fluid channels are used, then heat exchange efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The cooling channels and fluid distribution channels are integrated into the endplate structure, allowing close thermal coupling between the fuel cells and cooling pathways. The channels are positioned to maximize heat transfer efficiency while being formed as integral parts of the endplate, reducing the need for separate heat exchanger components.
Solution Approach 2:
The endplate utilizes composite construction with copper layers embedded in a polymer matrix (such as PTFE), combining the high thermal conductivity of copper for efficient heat exchange with the chemical resistance and machinability of polymer materials. This composite approach enables precise channel formation while maintaining thermal performance.
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 solution enhances gas circulation and pressure management, preventing fluid leakages and improving electrical conductivity while optimizing heat exchange, leading to a more efficient and reliable fuel cell operation.
Implementation Method 1
The gas ejector can have a Venturi tube or an orifice plate, a motive gas inlet, a suction gas inlet, and a gas mixture outlet for venting a mixture of the first motive gas and the suction gas
Implementation Method 2
The spring exerts a first force on one side of the piston, and the mixture of the motive gas and the suction gas exerts a second force on the other side of the piston disk
Data Source
AI summary
This disclosure related to polymer electrolyte member fuel cells and components thereof, including fuel cell endplates.