Fuel Cell Stack Alignment Assembly for Faster Precise Stacking
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Solution Overview
Problem
Existing fuel cell stack manufacturing methods require costly alignment features on both MEA and bipolar plates, leading to narrow manufacturing tolerances and a time-consuming stacking process, with risks of misalignment and performance deterioration.
Innovation Solution
A manufacturing arrangement with separate alignment stations for bipolar plates and MEAs, allowing pre-assembled units to be aligned and fastened, ensuring precise spatial orientation, and a handling device for automated stacking, enabling faster and more reliable assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment features are provided on both MEA and bipolar plates to ensure proper alignment, then alignment precision is improved, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The patent extracts the alignment function from the MEA and isolates it to the bipolar plate only. The bipolar plate is provided with alignment features (protrusions or recesses) while the MEA is kept simple without additional alignment features. This extraction principle reduces the complexity of the MEA manufacturing while maintaining alignment precision through the bipolar plate's alignment features.
Solution Approach 2:
The patent introduces an alignment tool as an intermediary component during the stacking process. This alignment tool engages with the alignment features on the bipolar plate to guide and position the MEA correctly. The intermediary alignment tool mediates between the bipolar plate's alignment features and the MEA, ensuring precise alignment without requiring complex features on the MEA itself.
2Manufacturing precision
If narrow tolerances are enforced in the manufacture of MEAs and bipolar plates to ensure proper alignment, then alignment precision is improved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent segments the alignment function into two independent parts: alignment features on the bipolar plate and a corresponding alignment tool. This segmentation allows the MEA manufacturing to proceed with standard tolerances while the bipolar plate incorporates the alignment features. The separation of alignment functionality enables parallel processing and reduces the need for rework, thereby improving productivity.
Solution Approach 2:
The bipolar plate with integrated alignment features performs the alignment function automatically during the stacking process. The alignment features (protrusions or recesses) self-align with the alignment tool, providing self-guiding functionality that ensures precise positioning without requiring manual adjustment or enforcement of narrow tolerances on the MEA, thus improving manufacturing efficiency.
3Reliability
If a single bipolar plate or MEA is not properly aligned, then the complete stack must be dismissed to ensure integrity, but this increases loss of time and reduces productivity
Solution Approach 1:
The patent incorporates alignment features on the bipolar plate and uses an alignment tool during the stacking process to prevent misalignment before it occurs. This beforehand cushioning approach ensures that each component is correctly positioned during assembly, preventing the need to discard the entire stack due to a single misaligned component. The preventive alignment mechanism protects stack integrity while maintaining productivity.
4Manufacturing precision
If alignment features are provided on both MEA and bipolar plates, then alignment precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the alignment function from the MEA and places it solely on the bipolar plate. The bipolar plate is provided with alignment features (protrusions or recesses) while the MEA is kept simple without additional alignment features. This extraction principle reduces the manufacturing cost of the MEA while maintaining alignment precision through the bipolar plate's alignment features.
Solution Approach 2:
The alignment features on the bipolar plate serve as a reusable template or copy for alignment purposes. Instead of incorporating expensive alignment features into each MEA, the bipolar plate's alignment features are used repeatedly with the alignment tool during stacking. This copying approach reduces manufacturing costs while maintaining consistent alignment precision across multiple assemblies.
Data Source
Figure 1
Figure 2~3
AI summary
The invention discloses a manufacturing arrangement (1) for a fuel cell stack (2) comprising at least a first alignment station (6) having a first alignment structure (24) for receiving a bipolar plate (22) and a second alignment structure (24) for arranging a membrane electrode assembly (26) at one side of the bipolar plate (22), preferably on top of the bipolar plate (22), in a predefined orientation for aligning the bipolar plate (22) and the membrane electrode assembly (26), whereby a pre-assembled fuel cell unit (28) is provided; a fastening station (14) for fastening the membrane electrode assembly (26) to the bipolar plate (22), whereby an assembled fuel cell unit (4) is provided; and a second alignment station (8) having at least one third alignment structure (30) for aligning the assembled fuel cell units (4) for providing a fuel cell stack (2), as well as a method for manufacturing a fuel cell stack (2), and a fuel cell stack (2) having been manufactured by means of such an arrangement and/or method.