Segmented Fuel Cell Stack with Movable Barriers
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Solution Overview
Problem
Current fuel cell systems operate with suboptimal efficiency due to excess operating media leading to increased losses, and the inability to independently vary stoichiometry across cascade stages, resulting in inefficient utilization of operating media.
Innovation Solution
A fuel cell stack with segmented architecture, where individual fuel cells are arranged in parallel within each segment, allowing for the variation of the number of fuel cells and segments, and movable fluid barriers to optimize operating medium flow and consumption across stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel cell systems operate with excess operating media to ensure stable operation, then reliability is improved, but energy efficiency deteriorates due to increased losses
Solution Approach 1:
The fuel cell stack is divided into multiple segments with movable fluid barriers, allowing independent control of operating media flow in each segment. This enables optimization of media utilization efficiency in later segments while maintaining stable operation in earlier segments, resolving the contradiction between reliability and energy efficiency.
2Device complexity
If a fixed cascade configuration is used, then device complexity is reduced, but adaptability deteriorates due to inability to independently vary stoichiometry across stages
Solution Approach 1:
Movable fluid barriers are introduced into the cascade configuration, transforming the fixed structure into a dynamic one. The barriers can be repositioned to vary the number of fuel cells in each segment, enabling independent stoichiometry adjustment across cascade stages while maintaining manageable device complexity.
3Adaptability or versatility
If the number of fuel cells in each segment is variable, then adaptability is improved for optimizing media utilization, but device complexity increases due to movable fluid barriers
Solution Approach 1:
The fuel cell stack is segmented into multiple independent sections with controllable fluid barriers. This segmentation enables flexible adjustment of the number of active fuel cells in each segment, optimizing media utilization across the cascade while distributing the complexity across modular units rather than requiring a completely reconfigurable system.
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 configuration enhances system efficiency by optimizing the use of operating media, reducing unconsumed media release, and allowing independent adjustment of stoichiometry across stages, thereby improving overall fuel cell system performance.
Implementation Method 1
electrochemical oxidation of H2 to H+ with loss of electrons takes place
Implementation Method 2
Fuel cells use the chemical conversion of a fuel with oxygen into water in order to generate electrical energy
Implementation Method 3
a transport of the H+ protons from the anode chamber into the cathode chamber is effected via the electrolytes or the membrane
Implementation Method 4
ion-conducting (usually proton-conducting) membrane
Implementation Method 5
a reduction of O2 to 2 O2− with uptake of electrons takes place
Implementation Method 6
The latter generally comprise supported precious metals, in particular platinum
Data Source
AI summary
The invention relates to a fuel cell stack having at least two segments of individual fuel cells arranged in parallel in terms of fluid, said segments being arranged in series relative to one another in terms of fluid. It is provided that the fuel cell stack is set up to vary the number of individual fuel cells in at least one segment.