Fuel Cell Flow Path and Seal Layout for Bypass Gas Control
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Solution Overview
Problem
Conventional fuel batteries face issues with reaction gas leakage and surface pressure variance due to deflection of bipolar plates, which affects energy efficiency and reaction gas flow regulation.
Innovation Solution
A power generation cell design featuring a wavy-shaped reaction gas flow path and a sealing part with convex top parts to prevent leakage, where the convex parts of the sealing part and reaction gas flow path form a regulation part to control bypass flow, and the flow paths are arranged to minimize deflection and surface pressure variance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a restriction member is added to block bypass flow, then reaction rate increases, but device complexity increases
Solution Approach 1:
The sealing part is integrated into the separator structure, combining the sealing function and the bypass flow regulation function into a single component. The convex portions of the sealing part directly form restriction regions within the reaction gas flow path, eliminating the need for separate restriction members while achieving both sealing and flow control.
Solution Approach 2:
The sealing part performs multiple functions: it seals the reaction gas flow path to prevent leakage, regulates bypass flow through its convex portions, and maintains structural integrity of the separator. This multi-functional design eliminates the need for additional dedicated restriction members.
2Area of stationary object
If the pitch of reaction gas flow paths is decreased to increase power generation region, then power generation area increases, but deflection of bipolar plate occurs
Solution Approach 1:
The sealing part features convex portions that create curved restriction regions within the flow path. This curved geometry allows for compact design with reduced pitch while maintaining structural stability and preventing deflection, as the convex portions provide structural reinforcement points.
Solution Approach 2:
The flow path is segmented by the convex portions of the sealing part into multiple regions. This segmentation allows for closer spacing of flow paths while maintaining adequate flow control and preventing excessive material accumulation that causes deflection.
3Reliability
If a sealing part is added to prevent leakage, then reliability improves, but device complexity increases
Solution Approach 1:
The sealing function is merged into the separator structure through the sealing part with convex portions. This integration ensures reliable sealing and bypass flow control simultaneously, while eliminating the need for separate sealing components and restriction members.
Solution Approach 2:
The sealing part serves as both the sealing element and the flow regulation element. Its convex portions create restriction regions that control bypass flow while the overall structure provides sealing against leakage, achieving multiple functions in one component.
Data Source
AI summary
A power generation cell of the present invention is provided with a reaction gas flow path that has a wavy shape and through which reaction gas flows along an electrolyte membrane electrode assembly from one end side of a separator toward the other end side, and a sealing part contacting a resin frame part of the electrolyte membrane electrode assembly and surrounding the reaction gas flow path to prevent leakage of the reaction gas. The sealing part includes a plurality of top parts that are convex on the reaction gas flow path side. Each top part of the reaction gas flow path, which is convex on the sealing part side is positioned on a straight line connecting two adjacent top parts of the sealing part or protrudes on the sealing part side beyond the straight line.