Fuel Cell End Plate Manifold Strength via Lateral Flow Channels
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Solution Overview
Problem
The existing fuel cell stack designs face challenges with the strength and layout flexibility of end plates due to the large-sized holes for manifold connections, which compromise the structural integrity and freedom of layout around the manifolds.
Innovation Solution
The design incorporates penetrating holes in the end plates connected to fluid passages and a flow channel system with channel ports on a different surface, allowing for independent flow of gases and coolant, and increasing the strength around manifold connections while simplifying the layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If large-sized holes are formed in the end plate for manifold connections, then the manifolds can be attached to the end plate, but the strength of the end plate is decreased in the portion near the manifold connection positions
Solution Approach 1:
The invention moves the coolant flow channel opening from the same surface as the manifold connection holes to a different surface of the end plate. This dimensional relocation allows the coolant channel to access the third fluid passage without requiring a large opening near the manifold attachment points, thereby preserving the end plate's structural strength while maintaining coolant flow functionality.
2Volume of stationary object
If a plurality of devices and manifolds are provided closely to one another at positions outside and adjacent to the end plate, then the system can be compact, but the freedom of layout is constrained significantly
Solution Approach 1:
By opening the coolant flow channel to a different surface of the end plate rather than the same surface where manifolds are connected, the invention creates additional spatial freedom for arranging devices and manifolds. This dimensional separation allows more flexible layout configurations without increasing the overall system volume, as components can be positioned with greater freedom on the exterior surfaces.
3Device complexity
If holes for manifold connections and coolant flow channels are positioned close to one another on the same surface of the end plate, then the structure is simple, but the strength near manifold connections is compromised
Solution Approach 1:
The invention resolves the conflict between structural simplicity and strength by relocating the coolant flow channel opening to a different surface of the end plate. This maintains the simplicity of the overall structure while physically separating the coolant channel access from the manifold connection areas, thereby preserving the end plate's strength in the manifold connection zones without adding complex structural elements.
Data Source
AI summary
A fuel cell stack includes a plurality of power generation cells and an end plate. A plurality of fluid passages for allowing a fuel gas, an oxygen-containing gas, and a coolant to flow independently in a stacking direction are provided in the plurality of power generation cells. The end plate includes: holes which penetrate through the end plate in a thickness direction and are connected to the fluid passages, and to which manifolds are connected; and flow channels formed in the end plate, and connected to the fluid passages. The flow channels include first and second lateral openings opened to a surface which is different from a surface where the holes are opened.