Fuel Cell Separator Rib Cushioning for Sealing Pressure
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Solution Overview
Problem
Conventional fuel cells face issues with sealing performance degradation due to changes in seal height over time, leading to potential foreign material entry and reduced power generation efficiency, as the compression load on sealing members decreases and elastic deformation varies, affecting the sealing line pressure.
Innovation Solution
The fuel cell design incorporates a metal plate with a rib frame around passages, where the rib surface contacts adjacent separators, maintaining a small compression ratio and preventing increased line pressure, thus maintaining sealing performance even with seal height reduction over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If seal height is reduced over time due to deterioration, then compression load on sealing members decreases, but this leads to reduced sealing line pressure and degraded sealing performance
Solution Approach 1:
The rib portion is designed with sufficient height (H1) to act as a cushion that prevents excessive compression of the sealing portion. This beforehand cushioning ensures that even as the seal height reduces over time, the rib portion maintains the compression load on the sealing portion, preventing sealing line pressure from dropping below effective levels.
Solution Approach 2:
The separator design changes the parameter of height distribution: by setting H1 ≥ H2, the design ensures that the rib portion maintains a minimum height that prevents over-compression. This parameter control allows the sealing portion to maintain effective sealing pressure throughout the service life, compensating for natural compression over time.
2Reliability
If elastic deformation varies between different portions of the insulating member, then sealing performance becomes inconsistent, but increasing uniformity requires more complex structure
Solution Approach 1:
The separator is segmented into a rib portion and a sealing portion with distinct functions. The rib portion provides uniform compression resistance, while the sealing portion maintains consistent sealing pressure. This segmentation simplifies the structure by using a single integrated piece rather than multiple components, while achieving uniform sealing performance through functional differentiation.
3Length of stationary object
If the inner edge of the separator is positioned where insulating members contact each other, then spacing is maintained, but compression load increases on the insulating members
Solution Approach 1:
The separator structure segments the compression function (rib portion) from the sealing function (sealing portion). The rib portion absorbs the compression load through its greater height, preventing excessive force from being applied to the sealing portion. This segmentation allows the separator to maintain proper spacing while distributing compression load appropriately.
Solution Approach 2:
The design changes the height parameter of the separator: by setting H1 ≥ H2, the rib portion is given sufficient height to resist compression without transmitting excessive force to the sealing portion. This parameter adjustment ensures that the sealing portion maintains effective sealing pressure while the rib portion absorbs the bulk of the compression load.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures consistent sealing performance around passages, preventing pressure reduction and foreign material entry, allowing the fuel cell to be used for a longer period without degradation in sealing efficiency.
Implementation Method 1
an elastic deformation amount varies between a portion of the insulating member 4 where the inner edge la is present and the other portion of the insulating member 4
Implementation Method 2
the compression load on sealing members decreases and elastic deformation varies, affecting the sealing line pressure
Data Source
AI summary
A first metal separator of a fuel cell comprises a metal plate, and a first seal member is formed integrally on both surfaces of an outer edge of the metal plate. A first rib having a frame shape is provided around an oxygen-containing gas supply passage or the like of the metal plate. The first rib has a rib surface spaced away from an inner end surface of the metal plate around the oxygen-containing gas supply passage or the like, toward the oxygen-containing gas supply passage or the like.