Fuel Cell Manifold Hole Integration for Miniaturization
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Solution Overview
Problem
Conventional fuel cell designs face challenges in miniaturization due to the requirement of space for projections and step portions that unite the frame-integrated MEA and separators, hindering size reduction and efficiency.
Innovation Solution
A fuel cell design featuring a membrane-electrode-assembly (MEA) with a frame and sandwiching separators, incorporating manifold holes with projections that extend into the separators' holes, eliminating the need for additional space and enabling easy integration, while also serving as an insulator to prevent electrical short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projections and step portions are provided to unite the frame-integrated MEA and separators, then the integration reliability is improved, but the fuel cell size increases
Solution Approach 1:
The patent merges the positioning function into the manifold hole structure itself. The peripheral portion of the manifold hole on the frame body extends to cover the inner periphery surface of the manifold hole on the separator, eliminating the need for separate projections and step portions. This integration maintains reliable positioning while reducing overall fuel cell size.
Solution Approach 2:
The manifold hole peripheral portion serves multiple functions: it acts as both the flow passage structure and the positioning element. By making the manifold hole structure multi-functional, the patent eliminates dedicated positioning components, thereby reducing space requirements while maintaining integration reliability.
2Manufacturing precision
If additional positioning components are provided, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The positioning function is merged into the existing manifold hole structure. The peripheral portion of the manifold hole on the frame body naturally extends to cover the separator's manifold hole, providing accurate positioning without requiring additional components. This simplification reduces device complexity while maintaining positioning accuracy.
Solution Approach 2:
The manifold hole structure itself provides the positioning function through its geometric configuration. The extending peripheral portion automatically guides and positions the separator during assembly, eliminating the need for separate positioning components and reducing overall structural complexity.
Data Source
Figure 1
Figure 2~3
Figure 4~5(B)
AI summary
In conventional fuel cells that have a structure in which an integrated frame type membrane electrode assembly and a pair of separators have been integrated, the provision of a plurality of protrusions and multi-level sections makes it difficult to achieve miniaturization of the fuel cell. A fuel cell (FC) is provided with a membrane electrode assembly (2) provided with a frame (1), both of which are sandwiched between two separators (3), and is configured such that reactive gas is circulated between the frame (1) and the separators (3). By having a structure in which the frame (1) and both separators (3) each have manifold holes (H1 - H6), and the rims of the manifold holes of frame (1) extend into the manifold holes in the separators (3), and protrusions (11) cover the inner peripheral surfaces of the manifold holes in at least one of the separators (3), it is possible to easily and accurately position and integrate the separators (3) and the frame (1), and fuel cell miniaturization can be achieved because space to position the protrusions (11) is not needed.