Asymmetric Load Receiver for Fuel Cell Separator Alignment
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Solution Overview
Problem
In fuel cell stacks, the formation of burrs during press forming of load receivers can lead to erroneous assembly due to the difficulty in distinguishing between surfaces with and without burrs, causing misalignment during the joining process.
Innovation Solution
The load receiver is formed asymmetrically about its central line, with specific features such as a cutout and projection, and a rib structure to ensure correct alignment and prevent misassembly by providing distinct engagement points and visual cues for correct orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the load receiver is formed symmetrically about the central line, then the manufacturing process is simpler, but it becomes difficult to recognize the correct surface orientation for assembly
Solution Approach 1:
The load receiver is designed with an asymmetric shape about the central line, creating distinct visual differences between the two surfaces. This asymmetry allows assembly workers to easily identify the correct surface orientation (the surface without burrs) by observing the asymmetric features, thereby resolving the contradiction between manufacturing simplicity and assembly recognition.
2Productivity
If the load receiver is formed by press forming, then production efficiency is improved, but burrs are formed on the surface
Solution Approach 1:
The patent applies local quality by creating an asymmetric design where one surface of the load receiver is intentionally made distinct from the other. This allows the burred surface to be localized and identified, while the opposite surface remains clean and suitable for assembly. The asymmetric features (such as different edge configurations or surface textures) enable workers to distinguish which surface has burrs without requiring complete surface refinement.
3Strength
If the load receiver is overlapped with the separator for joining, then the structural integrity is improved, but erroneous assembly may occur
Solution Approach 1:
The asymmetric design of the load receiver prevents erroneous assembly by ensuring that only the correct orientation allows proper overlapping and joining with the separator. The asymmetric features create a geometric constraint where the load receiver can only be correctly positioned in one orientation, thereby maintaining both joint strength and assembly accuracy.
Data Source
AI summary
A separator member of a fuel cell stack includes a load receiver in a form of a plate. The load receiver is joined to a first separator in a manner that the load receiver protrudes outward from an outer peripheral portion of the first separator. The load receiver is formed asymmetrically about a central line passing through the center of the load receiver in the width direction and extending in the protruding direction of the load receiver.