Fuel Cell Stack Load Receiver Protrusion Design
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Solution Overview
Problem
Fuel cell stacks face instability in receiving external loads perpendicular to the stacking direction due to dimensional and production tolerances affecting the contact points of load receivers and contact portions, leading to inconsistent load distribution.
Innovation Solution
A fuel cell stack design featuring a load receiver with a protrusion having a central body and expansions, where only the top portion of the expansion contacts the contact portion, maintaining consistent distances between the fulcrum and force points, ensuring stable load reception perpendicular to the stacking direction, and incorporating a joint portion and ribs for enhanced rigidity and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular protrusion is used in the load receiver, then the structure is simple and easy to manufacture, but the contact position varies due to dimensional tolerance and assembling tolerance, causing unstable load reception
Solution Approach 1:
The invention replaces the rectangular protrusion with a circular protrusion. The circular shape ensures that regardless of rotational position or dimensional variations, the contact always occurs at the topmost point of the circle, maintaining a consistent distance from the fulcrum point. This curvature-based design eliminates the variability inherent in rectangular shapes while remaining simple to manufacture.
Solution Approach 2:
The invention changes the geometric parameter of the protrusion from a rectangular shape with fixed width to a circular shape with fixed radius. This parameter change ensures that the contact point is always at the highest point of the circle, making the distance from the fulcrum point independent of rotational orientation or manufacturing tolerances, thus stabilizing load reception.
2Adaptability or versatility
If the contact portion contacts the protrusion at different positions, then the distance between the fulcrum point and force point changes, but this variability causes unstable load reception perpendicular to the stacking direction
Solution Approach 1:
The circular protrusion ensures that the contact always occurs at the topmost point, maintaining a constant distance from the fulcrum point. This geometric property provides stability in load reception while allowing the system to adapt to manufacturing tolerances and assembly variations through the rotational symmetry of the circle.
Data Source
AI summary
A fuel cell stack includes a load receiver provided in a first separator, and a contact portion. The load receiver includes a protrusion protruding outward from an outer peripheral portion of the first separator. The protrusion includes a protrusion body positioned at the center in a width direction of the protrusion, and a pair of expansions expanded in the width direction from both ends of the protrusion body in the width direction. When the load receiver contacts the contact portion, only a top portion of the expansion contacts the contact portion.