Coated Bipolar Plate With Semi-Circular Channels for Thin SOFC Stacks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solid oxide fuel cells (SOFCs) are heavy, brittle, and have sealing issues, making them unsuitable for applications like drones and electric vehicles, and metal-supported SOFC stacks are too thick and heavy for high volumetric power density requirements.
Innovation Solution
A bipolar plate with semi-circular gas flow channels and a non-metal oxide coating on the surface, combined with an insulating coating on the edges, reduces the thickness of the fuel cell stack while maintaining strength and preventing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thick metal substrates are used to support the anode, then the strength of the SOFC is improved, but the weight and thickness of the fuel cell stack increase
Solution Approach 1:
The patent uses a composite structure combining a thin metal substrate with a ceramic coating layer. The metal substrate provides mechanical strength while the ceramic coating provides chemical stability and protection, allowing the metal substrate to be thinner than conventional designs while maintaining overall structural integrity and strength.
2Reliability
If multiple thick bipolar plates are used to ensure proper isolation between adjacent fuel cells, then the reliability of the fuel cell stack is improved, but the overall thickness increases
Solution Approach 1:
The bipolar plate uses a composite structure with a thin metal substrate combined with ceramic coatings on both surfaces. This composite design provides sufficient electrical isolation and mechanical separation between adjacent fuel cells while keeping the plate thickness minimal, enabling high volumetric power density.
3Ease of manufacture
If conventional square gas flow channels are used, then the manufacturing simplicity is maintained, but the surface area for gas contact with the anode is reduced
Solution Approach 1:
The patent employs semi-circular gas flow channels instead of conventional square channels. The curved semi-circular geometry increases the surface area available for gas contact with the anode, improving reaction efficiency while remaining compatible with standard manufacturing processes like laser drilling or punching.
4Adaptability or versatility
If the bipolar plate thickness is reduced to achieve high volumetric power density, then the suitability for mobile applications is improved, but the structural strength and sealing capability deteriorate
Solution Approach 1:
The thin bipolar plate achieves sufficient strength and sealing capability through a composite structure: a thin metal substrate provides baseline mechanical strength, while ceramic coatings on the surfaces enhance chemical stability, prevent degradation, and improve sealing properties. This composite approach enables ultrathin design suitable for mobile applications without sacrificing structural integrity.
Solution Approach 2:
The ceramic coatings are applied locally on the surfaces of the thin metal substrate, providing enhanced protective properties where needed (chemical stability, sealing) while keeping the overall plate thickness minimal. This localized enhancement allows the bulk of the plate to remain thin for high volumetric power density.
Data Source
AI summary
A bipolar plate is provided that includes a metal plate, at least one channel, a first coating, and a second coating. The metal plate has a first surface, a second surface opposite the first surface, a first edge surface connecting the first surface to the second surface, and a second edge surface opposite the first edge surface and connecting the first surface to the second surface. The at least one channel is formed in at least one of the first surface and the second surface. The first coating is formed on the at least one of the first surface and the second surface such that the first coating covers each of the at least one channel. The second coating is formed on the first edge surface and the second edge surface. Each of the at least one channel has a semi-circular shape and extends along the at least one of the first surface and the second surface.