Fuel Cell Stack Separator Plates for Low Pressure Loss Cooling
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Solution Overview
Problem
Conventional fuel cell stacks face issues with water transfer imbalance and high mass transfer resistance in reactive gases, leading to pressure loss in gas and cooling water flow paths, as well as inadequate structural reinforcement for compression during stacking.
Innovation Solution
The fuel cell stack incorporates a first and second separating plate with protrusions on their surfaces, which contact the gas diffusion layers, creating optimized flow paths for reactive gases and cooling water, reducing fluid resistance and enhancing cooling performance and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional separating plates with flat surfaces are used, then the structure is simple, but pressure loss increases due to high fluid resistance in cooling water and reactive gas flow paths
Solution Approach 1:
The patent applies curvature by forming protrusions on the separating plate surfaces that come into contact with gas diffusion layers. These curved protrusions optimize the flow paths of both cooling water and reactive gases, reducing fluid resistance and pressure loss while maintaining a relatively simple overall plate structure.
Solution Approach 2:
The patent introduces a new dimensional feature by adding protrusions that extend from the separating plate surface toward the gas diffusion layer. This dimensional change creates optimized flow channels without requiring complete redesign of the entire separating plate structure, thus reducing pressure loss while limiting complexity increase.
2Ease of manufacture
If conventional separating plates without protrusions are used, then manufacturing is simple, but cooling performance is inadequate due to poor cooling water flow paths
Solution Approach 1:
The curved protrusions on the separating plate create optimized cooling water flow paths that improve heat dissipation efficiency. The curvature design enhances fluid dynamics without significantly complicating the manufacturing process, as the protrusions can be formed through standard molding or machining techniques.
3Device complexity
If conventional separating plates are used, then the structure is simple, but structural reinforcement for compression fastening is insufficient
Solution Approach 1:
The protrusions on the separating plate not only optimize fluid flow but also serve as structural reinforcement elements. These curved features increase the contact area and mechanical interlocking with adjacent components, enhancing compression fastening capability while adding minimal structural complexity.
Solution Approach 2:
The protrusions serve multiple functions simultaneously: they optimize cooling water and reactive gas flow paths, provide structural reinforcement for compression fastening, and improve overall mechanical stability. This multi-functionality reduces the need for additional separate components, thereby limiting complexity increase.
4Reliability
If porous bodies are applied to separating plates, then mass transfer resistance is reduced, but cooling water flow path characteristics become complex and pressure loss increases
Solution Approach 1:
Instead of applying porous bodies throughout the entire separating plate, the patent uses localized protrusions only at critical positions where flow optimization is needed. This local quality approach reduces mass transfer resistance at key interfaces while maintaining smooth flow paths elsewhere, thereby limiting pressure loss increase.
Data Source
AI summary
Fuel cell stacks may include a plurality of fuel cells including a membrane-electrode assembly that includes an anode electrode and a cathode electrode, gas diffusion layers respectively on opposing sides of the membrane-electrode assembly, a first separating plate having a first surface facing the anode electrode so as to be in contact with the gas diffusion layer and a second surface opposite to the first surface, and a second separating plate having a first surface facing the cathode electrode so as to be in contact with the gas diffusion layer and a second surface opposite to the first surface. At least one of the second surface of the first separating plate and the second surface of the second separating plate may include one or more protrusions protruding therefrom outwardly.