Fuel Cell Casing Rib Asymmetry and Hole Segmentation
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Solution Overview
Problem
Fuel cell systems face issues with liquid leakage and reduced rigidity due to external pressure when submerged, and confusion between fixation and positioning holes, leading to potential misalignment and seal degradation.
Innovation Solution
A fuel cell system design featuring a fuel cell casing with ribs extending only in the front-back direction for improved rigidity and water pressure resistance, and distinct holes for fixation and positioning to prevent misalignment and ensure proper sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs are extended in both longitudinal and lateral directions (grid-like shape), then rigidity of the fuel cell casing is improved, but the casing is more affected by water pressure when the vehicle runs on immersed paths
Solution Approach 1:
The patent applies asymmetry by extending ribs only in the front-back direction rather than in both longitudinal and lateral directions. This asymmetric rib configuration reduces the casing's exposure to water pressure from lateral directions while maintaining structural rigidity through strategically positioned longitudinal ribs, thereby resolving the contradiction between rigidity and water pressure resistance
2Device complexity
If the same hole is used for both fixation and positioning, then the number of holes is reduced, but confusion may occur leading to misalignment and seal degradation
Solution Approach 1:
The patent applies segmentation by dividing the hole function into two distinct holes: one dedicated to positioning and another to fixation. This functional segmentation eliminates confusion during assembly, ensures proper alignment through dedicated positioning holes, and maintains sealing integrity, resolving the contradiction between device simplicity and manufacturing precision
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
Enhances the fuel cell system's resistance to external pressures and improves rigidity, reducing the risk of liquid leakage and ensuring effective sealing by using separate holes for fixation and positioning, and employing a conical spring washer to minimize surface scraping during assembly.
Implementation Method 1
a bolt with a plain washer or a bolt with a conical spring washer... an extent to which at least one of the member having the bottom face and the another member of the fuel cell casing is scraped off during the tightening of the holt can be reduced
Data Source
AI summary
A fuel cell system mounted on a vehicle, includes: a fuel cell configured to cause electrochemical reaction between an anode gas and a cathode gas to proceed; and a fuel cell casing that is configured to place the fuel cell therein, wherein the fuel cell casing has a bottom face that is formed in an approximately rectangular shape, the fuel cell casing is positioned such that longitudinal sides of the approximately rectangular shape are parallel to a left-right direction of the vehicle, and the bottom face has a rib that is extended only in a front-back direction of the vehicle is provided on the bottom face.