External Guide Assembly for SOEC/SOFC Stacks to Prevent Jamming
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Solution Overview
Problem
Current guidance systems for high-temperature solid oxide electrolyzers and fuel cells face challenges in maintaining accurate guidance during the manufacturing phases, particularly with tall stacks, due to risks of rotational jamming and significant height changes during the glass-ceramic sealing cycle, which are exacerbated by the use of internal guide columns with tight clearances.
Innovation Solution
An external guidance system using guide elements that extend vertically and bear against the external lateral surfaces of the stack plates, secured by a fastening device with elastic compression return members, allowing for precise alignment and reduced friction, and incorporating notches or alternative shapes to facilitate stacking and thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If internal guide columns with tight clearances are used for guidance, then manufacturing precision is improved, but reliability deteriorates due to rotational jamming risks during glass-ceramic sealing
Solution Approach 1:
The patent extracts the guide columns from the internal structure and relocates them to external positions. The guide columns are now positioned outside the stack assembly, eliminating the risk of rotational jamming during glass-ceramic sealing while maintaining their alignment function. This external positioning resolves the contradiction by removing the harmful interaction between internal guides and the sealing process.
Solution Approach 2:
The patent introduces an intermediary mechanical connection system between the guide columns and the stack plates. This intermediary mechanism allows for controlled movement and adjustment during the sealing process, preventing direct contact that would cause jamming while maintaining guidance precision. The intermediary element acts as a buffer between the guidance function and the sealing process.
2Device complexity
If guide columns are positioned internally within the stack, then structural compactness is improved, but ease of manufacture deteriorates due to difficulty in integration of cooling circuits
Solution Approach 1:
The guide columns are extracted from the internal structure and positioned externally. This relocation creates internal space within the stack that can be utilized for integrating cooling circuits and other fluid pathways without interfering with the guidance function. The external positioning of guides simplifies the manufacturing process by providing clear access to internal channels.
3Strength
If internal guide columns are used, then structural integrity is improved, but ease of repair deteriorates due to difficulty in dismantling and reassembly
Solution Approach 1:
The guide columns are positioned externally rather than being embedded within the stack structure. This external positioning allows for easy removal and installation during maintenance operations, while the mechanical connections maintain structural integrity during operation. The guides can be independently accessed and replaced without disassembling the entire stack.
4Productivity
If multiple sub-stacks are stacked vertically, then productivity is improved, but manufacturing precision deteriorates due to cumulative alignment errors
Solution Approach 1:
The patent segments the guidance function into independent guide columns that can be individually positioned and adjusted for each sub-stack level. This segmentation allows for local alignment corrections at each stacking level, preventing cumulative errors from propagating through the entire vertical assembly. Each guide column operates independently to maintain precision across multiple stacked units.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The external guidance system ensures accurate alignment and reduces the risk of jamming, simplifies integration of cooling circuits, allows for easier dismantling, and enables the stacking of multiple sub-stacks, while maintaining mechanical integrity and thermal stability during the manufacturing process.
Implementation Method 1
a fastening device with elastic compression return members
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~5
AI summary
The main subject matter of the invention is an assembly (80) comprising: a stack (20) of SOEC/SOFC solid oxide cells, said stack consisting of a plurality of plates (P) stacked one on top of the other, each plate (P) having an outer lateral surface (Sl), said plurality of plates (P) comprising at least a plurality of electrochemical cells, a plurality of interconnectors, and upper (42) and lower (41) end plates; at least two guiding elements (11, 12, 13, 14) ensuring that the vertical stacking of at least some of the plates (P) of the stack (20) is guided, characterized in that said at least two guiding elements (11, 12, 13, 14) extend vertically in a vertical direction (Z) and bear against the outer lateral surface (Sl) of each (P) of said at least some plates (P).