Fuel Cell Assembly Device with Locating Strips
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Solution Overview
Problem
Current fuel cell stack assembly processes are inefficient due to long cycle times, instability of highly elastic membrane-electrode units, and the need for complex logistical connections between production stations, which hinder precise positioning and shaping of components during stacking and pressing.
Innovation Solution
An assembly device with vertically oriented locating strips and a drive system for synchronous displacement, allowing for secure positioning and adaptation to different geometries, integrated within the assembly process from stacking to pressing and tension element fitting, enabling efficient handling and alignment of membrane-electrode units and bipolar plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multi-station assembly processes are used, then fuel cell stacks can be assembled, but cycle times are long due to complex logistical connections between production stations
Solution Approach 1:
The patent combines multiple assembly operations (stacking, pressing, and tension element fitting) into a single integrated assembly device. The device includes a stacking area with locating strips for positioning components, a pressing area with pressing elements, and a tension element fitting area, all within one device structure. This eliminates the need for transporting stacks between multiple production stations, significantly reducing cycle times and logistical complexity.
2Adaptability or versatility
If membrane-electrode units with highly elastic sealing material are used, then sealing flexibility is improved, but structural stability deteriorates making it difficult to hold layers in shape and position during stacking
Solution Approach 1:
The patent introduces locating strips as intermediary elements between the membrane-electrode units and the assembly device structure. These locating strips provide lateral support and positioning for the unstable membrane-electrode units during stacking, while not interfering with the sealing function of the elastic material. The pressing elements also act as intermediaries to apply controlled pressure and maintain layer alignment throughout the assembly process.
3Strength
If upper and lower cover plates project laterally beyond the fuel cells, then structural support is improved, but lateral locating surfaces become impeded requiring specific structural precautions
Solution Approach 1:
The patent segments the assembly device into distinct functional areas: a stacking area with locating strips for lateral positioning, and a pressing area with pressing elements. The locating strips are positioned to provide lateral support to the fuel cell layers in the stacking area, while the pressing elements in the pressing area apply vertical pressure. This segmentation allows the cover plates to provide structural support without interfering with lateral locating, as each function is handled by dedicated elements in its own zone.
Data Source
AI summary
An assembly device may be employed to vertically stack a fuel cell stack having alternating membrane-electrode units and bipolar plates. The assembly device may include a base plate, a cover plate, and connecting pieces positioned at each of two end faces of the base plate and cover plate. A substantially cuboidal assembly chamber may be defined inside the assembly device by a plurality of vertically oriented locating strips, in order, via the locating strips, to position the membrane-electrode units and bipolar plates relative to one another during stacking. The assembly device may further include a drive for synchronous displacement of the locating strips.