Fuel Cell Stack Housing with Adjustable Cover for Height Tolerance
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Solution Overview
Problem
Fuel cell stacks experience significant height variations due to component tolerances, requiring individually adapted housings, which is costly and time-consuming.
Innovation Solution
A frame element with seals is used on the stack end element and housing to ensure seal-tightness, allowing for standardized housing heights and efficient installation, with the frame element being positively fitted and secured using adhesive bonding and screw connections, and seals made of materials like rubber or thermoplastic polyurethane for optimal sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If housings are individually adapted to each fuel cell stack height, then seal-tightness is ensured, but manufacturing cost and installation time increase significantly
Solution Approach 1:
The housing is divided into a base portion and a cover element that can be assembled in different configurations. The cover element can be positioned at different heights relative to the base portion, allowing the same housing components to accommodate fuel cell stacks of different heights while maintaining seal-tightness through the standardized sealing surfaces at the junction between base and cover.
Solution Approach 2:
A single standardized housing design with adjustable cover element positioning serves multiple height requirements. The housing base and cover element are designed as universal components that can be combined in different ways to match various fuel cell stack heights, eliminating the need to manufacture entirely different housing sets for each height specification.
2Adaptability or versatility
If numerous housings with different heights are produced in advance, then height variations are accommodated, but inventory complexity and production costs increase
Solution Approach 1:
The housing is segmented into standardized base and cover elements that can be independently manufactured and then assembled in different configurations. This segmentation allows a limited set of standardized components to create multiple height variations through simple assembly adjustments rather than producing entirely different housing units.
Solution Approach 2:
The housing system incorporates adjustable and reconfigurable elements that allow dynamic adaptation to different fuel cell stack heights. The cover element can be positioned at various heights and securely fastened, providing a dynamic solution that replaces the static approach of producing multiple fixed-height housing variants.
3Productivity
If standardized housings are used, then manufacturing efficiency increases, but accommodation of height tolerances becomes difficult
Solution Approach 1:
The standardized housing incorporates a dynamic adjustment mechanism where the cover element can be positioned at different heights relative to the base. This allows the standardized housing to adapt to fuel cell stacks with height variations within a specified range, maintaining both manufacturing efficiency and tolerance accommodation.
Solution Approach 2:
The housing design allows for parameter changes in the vertical dimension through adjustable cover element positioning. The standardized base and cover elements are designed with dimensional ranges that accommodate height tolerances, allowing the same standardized housing to fit stacks of varying heights by adjusting the cover position and securing it at the appropriate height.
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
This solution allows for cost- and time-efficient installation of fuel cell stacks with standardized housings, accommodating large height tolerances and reducing weight, while maintaining mechanical stability and preventing moisture penetration.
Implementation Method 1
at least one seal being situated at least between the stack end element and the housing in the area of the frame element
Implementation Method 2
The frame element is preferably mounted in a positive-fit manner on the end-face side of the stack end element and of the housing, the positive fit being assisted by appropriate adhesive bonding
Implementation Method 3
the positive fit being assisted by appropriate adhesive bonding and/or screw connections, thus ensuring a mechanically stable connection
Data Source
AI summary
A fuel cell stack is formed from a plurality of stacked fuel cell units and at least one stack end element. The stacked fuel cell units being surrounded by a housing. A frame element is situated on the at least one stack end element and the housing on the end-face side. At least one seal is situated at least between the stack end element and the housing in the area of the frame element.