Fuel Cell Stack End Plate Integration for Compact Multi-Series Compression
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Solution Overview
Problem
Fuel cell stacks face challenges in maintaining consistent compression force due to thermal expansion, reactant pressure, membrane hydration, and aging, which can lead to inefficiencies and uneven media distribution, especially when multiple cell series are used in limited installation spaces.
Innovation Solution
A fuel cell stack design where the first end plate with media connections serves as both a cover and an integral component of the housing, reducing component count and space requirements, and incorporating a tensioning system with side walls or tensioning elements between covers to maintain compression and compensate for tolerances across cell series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple cell series are arranged in limited installation space, then power output is increased, but component count and space requirements increase
Solution Approach 1:
The first end plate is merged with the first cover to form a single integral component. This reduces the total number of separate parts in the fuel cell stack, simplifying the overall structure while maintaining the capability to accommodate multiple cell series for increased power output.
Solution Approach 2:
The first end plate serves multiple functions: it acts as a structural cover for the housing, provides media connections for both cell series, and serves as a mounting surface for distribution structures. This multi-functionality reduces the number of separate components needed while supporting multiple cell series.
2Power
If multiple cell series are arranged in limited installation space, then power output is increased, but space requirements increase
Solution Approach 1:
The first end plate is merged with the first cover to form a single integral component. This reduces the total number of separate parts in the fuel cell stack, simplifying the overall structure while maintaining the capability to accommodate multiple cell series for increased power output.
Solution Approach 2:
The first end plate serves multiple functions: it acts as a structural cover for the housing, provides media connections for both cell series, and serves as a mounting surface for distribution structures. This multi-functionality reduces the number of separate components needed while supporting multiple cell series.
3Ease of manufacture
If conventional separate end plate and cover design is used, then assembly is straightforward, but production cycle time increases
Solution Approach 1:
The first end plate is merged with the first cover to form a single integral component. This reduces the total number of separate parts in the fuel cell stack, simplifying the overall structure while maintaining the capability to accommodate multiple cell series for increased power output.
Solution Approach 2:
The first end plate is designed as an integral component of the housing, prepared in advance during housing manufacturing. This preliminary integration eliminates the need for separate assembly steps during fuel cell stack production, reducing cycle time while maintaining ease of manufacture.
4Stability of the object's composition
If conventional separate end plate and cover design is used, then structural flexibility is maintained, but number of sealing points increases
Solution Approach 1:
The first end plate is merged with the first cover to form a single integral component. This reduces the total number of separate parts in the fuel cell stack, simplifying the overall structure while maintaining the capability to accommodate multiple cell series for increased power output.
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 design simplifies production, reduces cycle time and costs, and optimizes media distribution, allowing better utilization of space in motor vehicles while maintaining efficient compression and tolerance compensation.
Implementation Method 1
This plurality of fuel cells combined in a fuel cell stack is generally compressed with the aid of tension elements with a force in the range of several tons
Implementation Method 2
swelling of the membrane used during its hydration
Implementation Method 3
The increase in the compression force is caused by thermal expansion of the components used
Data Source
AI summary
A fuel cell stack accommodated in a housing including a first cover and a second cover, which comprises a tensioning system and a plurality of fuel cells, which are arranged in at least two cell series between a first end plate and a second end plate, which at least the first end plate has media connections and distribution structures for media distribution, wherein the first end plate forms the first cover of the housing. A fuel cell device and a motor vehicle comprising such a fuel cell stack is also provided.