Fuel Cell Plate Member With Corrugated Sheet Alignment
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Solution Overview
Problem
Current fuel cell stack assembly processes face challenges with poor alignment of apertures between the bipolar plate, MEA, corrugated sheet, and separator sheet, leading to flow impediment of hydrogen gas, reduced stack performance, and increased manufacturing complexity.
Innovation Solution
A plate member for a fuel cell stack is designed with a corrugated channel sheet and alignment parts that facilitate horizontal and vertical alignment with other corrugated channel sheets, using alignment rods and sealing parts to ensure proper alignment and sealing of fluid flow channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional graphite bipolar plates are replaced by metallic bipolar plates to reduce weight and dimensions, then power density is improved, but alignment precision of apertures deteriorates
Solution Approach 1:
The bipolar plate is segmented into multiple functional layers: a metallic bipolar plate base layer, a corrugated sheet layer with flow channels, and a separator sheet layer. Each layer is independently manufactured with standardized aperture patterns, and they are assembled together to achieve the final aligned configuration. This segmentation allows each component to be optimized separately while ensuring overall alignment through the standardized interface design.
Solution Approach 2:
The corrugated sheet acts as an intermediary component between the metallic bipolar plate and the separator sheet. It provides a standardized aperture pattern that mediates the alignment between the metallic plate's apertures and the separator sheet's apertures. The corrugated sheet's rigid structure and precise aperture positioning serve as a reference framework that ensures accurate alignment across all layers.
2Reliability
If tight sealing requirements are imposed to prevent hydrogen flow contact with air, then reliability is improved, but device complexity increases
Solution Approach 1:
The sealing function is merged with the structural components themselves. The corrugated sheet and separator sheet are designed with integrated sealing features where their edges and aperture configurations naturally create sealed pathways. The gasket is strategically positioned to seal only the critical peripheral edges, while the internal flow channels are sealed by the precise fit and configuration of the layered components, eliminating the need for separate sealing mechanisms throughout the assembly.
Solution Approach 2:
The corrugated sheet serves multiple functions simultaneously: it provides the flow channel structure, acts as a sealing barrier between hydrogen and air pathways, serves as an alignment reference for aperture positioning, and provides structural support for the assembly. This multi-functionality reduces the number of separate components needed and simplifies the overall assembly process while maintaining reliable sealing.
3Manufacturing precision
If alignment features are added to both ends of the stack to improve aperture alignment, then manufacturing precision is improved, but material waste increases
Solution Approach 1:
The alignment solution moves from a linear extension approach to a vertical stacking approach. Instead of extending the corrugated sheet horizontally beyond the stack ends, alignment features are implemented as vertically stacked components at the ends. The alignment pins or features are positioned at the vertical interfaces between stacked bipolar plate assemblies, allowing alignment to be achieved in the vertical stacking direction rather than requiring horizontal material extension.
4Reliability
If multiple sealing arrangements and bridges are added to enclose MEA in frame, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The complex sealing and bridging functions are extracted from the frame structure and transferred to the bipolar plate assembly itself. The corrugated sheet and separator sheet are designed with integrated sealing features that eliminate the need for separate bead arrangements, elastomeric seals, and bridges. The frame is reduced to a simple positioning and compression structure, while the sealing functionality is embedded in the layered bipolar plate construction, significantly simplifying the manufacturing process.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A plate member for a cell stack, a cell stack assembly, a method of forming a plate member for a cell stack and a method of assembling a cell stack may be provided, and the plate member comprises a channel sheet comprising at least one peak and one trough for forming fluid flow channels; two alignment parts, each alignment part comprising a main body and one or more alignment members, the main body having a through hole 10 provided within the main body; and wherein the alignment part is capable of aligning the channel sheet parallel to a plane of the main body and the alignment member is capable of aligning the alignment member to another corresponding alignment member along an axis passing through the alignment member; and further wherein the channel sheet is disposed between the two alignment parts.