Fuel Cell Stack Alignment Using Internal Features for Assembly Access
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Solution Overview
Problem
Existing fuel cell stack assembly methods rely on external elements for alignment, which limit access and do not provide high enough tolerance levels, and lack internal rigidity.
Innovation Solution
An alignment system using internal alignment features and a selectively operable alignment member that engages and disengages with these features to align fuel cell components within a fuel cell stack, allowing for precise orientation and improved access during assembly, while also providing additional rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external elements are used to surround or cage the components for alignment, then alignment can be achieved, but access to various components during assembly is limited
Solution Approach 1:
Instead of using external alignment elements that surround the components, the patent inverts the approach by using internal alignment features integrated into the components themselves. The alignment pins are built into the end plates and bipolar plates, allowing alignment without external cages or fixtures that would block access.
Solution Approach 2:
The components perform their own alignment function through integrated alignment pins and corresponding alignment holes. Each plate contains its own alignment features that automatically guide proper positioning during assembly, eliminating the need for external alignment devices that would restrict access.
2Manufacturing precision
If external elements are used for alignment, then alignment can be achieved, but higher tolerance levels cannot be provided
Solution Approach 1:
The alignment function is built into the components themselves through integrated alignment pins and holes. This self-aligning mechanism achieves high tolerance levels without requiring complex external alignment systems, fixtures, or multiple adjustment steps.
Solution Approach 2:
The alignment function is extracted from external alignment devices and integrated directly into the fuel cell components. The alignment pins are formed as part of the end plates and bipolar plates, eliminating the need for separate external alignment systems and achieving tighter tolerances through direct component integration.
3Manufacturing precision
If internal alignment features are used, then access to components is improved and high tolerance levels are achieved, but additional rigidity must be provided to maintain alignment
Solution Approach 1:
The alignment function is merged with the structural components themselves. The alignment pins are integrated into the end plates and bipolar plates, combining the alignment function with the load-bearing structure. This integration ensures that the components providing alignment also provide the structural rigidity needed to maintain alignment under operating conditions.
Data Source
AI summary
An alignment system and method for assembling a fuel cell stack. Components of the fuel cell stack have internal alignment features and are aligned to a predetermined orientation during assembly. The system and method allow fuel cell stacks to be assembled within high tolerance levels while improving access to each component during assembly. Additionally, the system and method can provide additional rigidity to a fuel cell stack.