Laminar Electrical Contacts for Fuel Cell Bipolar Plates
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Solution Overview
Problem
Traditional fuel cell stacks experience incomplete electrical contact between bipolar separator plates (BSPs) and membrane electrode assemblies (MEAs), leading to poor electrical conduction and leakage issues due to the 'filter-press' structure, which fails to effectively seal hydrogen, oxidants, and coolant, and maintain electrical contact.
Innovation Solution
The implementation of laminar electrical contacts, which are compliant and can be connected to a conducting base plate or BSP, providing a uniform and robust contact between the BSP and MEA, eliminating the need for heavy end plates and tie rods, and ensuring continuous electrical contact through an array of independently acting contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional filter-press structure with heavy end plates and tie-rods is used, then structural strength and sealing are improved, but electrical contact between BSP and MEA deteriorates
Solution Approach 1:
The patent divides the electrical contact function into multiple independent spring-loaded contacts distributed across the bipolar separator plate. Each spring contact independently maintains pressure on the MEA, ensuring reliable electrical connection without requiring heavy end plates and tie-rods for compression.
Solution Approach 2:
The patent changes the mechanical parameter from static compression (filter-press structure) to dynamic spring-loaded contact. The springs automatically adjust to maintain optimal contact pressure, improving electrical connection while reducing the need for heavy structural components.
2Reliability
If uniform electrical contact is achieved through laminar contacts, then electrical conduction is improved, but device complexity increases
Solution Approach 1:
The spring-loaded laminar contacts serve multiple functions: they provide electrical conduction, maintain sealing pressure, and accommodate manufacturing tolerances. This multi-functionality improves electrical conduction without proportionally increasing device complexity.
Solution Approach 2:
The spring-loaded contacts are self-adjusting and self-regulating. They automatically maintain optimal contact pressure and electrical connection without requiring external control mechanisms, reducing the overall system complexity while ensuring reliable electrical conduction.
3Reliability
If heavy end plates and tie-rods are used for compression, then sealing is improved, but weight and device complexity increase
Solution Approach 1:
The patent distributes the sealing and compression function across multiple spring-loaded contacts integrated into the bipolar separator plates, eliminating the need for heavy end plates and tie-rods. This segmentation maintains sealing reliability while dramatically reducing weight.
Solution Approach 2:
The patent replaces the heavy mechanical compression system (end plates and tie-rods) with a lightweight spring-loaded contact system. The springs provide sufficient compression force for sealing and electrical contact without the weight and complexity of traditional mechanical fastening systems.
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 fuel cell performance by achieving uniform internal load distribution and improved electrical contact, reducing gas and liquid leakage, and increasing efficiency, while allowing for more efficient gas flow and turbulence, applicable to various fuel cell types including PEMFC, AFC, and PAFC.
Implementation Method 1
compliant electrical contacts
Data Source
AI summary
A laminar electrical contact for fuel cells is disclosed. By optimizing the contact area and pressure between a separator plate and a membrane electrode assembly, the lamina of the present invention improves fuel cell efficiency and performance. The lamina may rest upon compliant members or springs that push the lamina into the adjoining membrane electrode assembly, thereby assuring continuous and robust electrical contact between the separator plate and the membrane electrode assembly.