Fuel Cell Stack Flexible Closure for Rapid Cell Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell stacks require significant technical effort and time to replace a defective cell, leading to high repair costs due to the need to disassemble the entire stack and risk of damaging undamaged cells.
Innovation Solution
A fuel cell apparatus with a housing and pressure chamber featuring a flexible closure with pockets that exert pressure on the cells, allowing for easy removal and replacement of cells by reducing pressure in the chamber, eliminating the need to discharge fluids and minimizing disassembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cells are solidly connected in a conventional fuel cell stack, then structural stability and electrical connection are improved, but ease of repair deteriorates due to the need to disassemble the entire stack to replace a defective cell
Solution Approach 1:
The fuel cell stack is segmented into modular units where each cell can be independently removed and replaced. The housing is divided into separate compartments or slots that accommodate individual cells, allowing defective cells to be extracted without disassembling the entire stack structure.
Solution Approach 2:
Defective cells can be extracted from the stack independently. The design allows for the removal of individual cells from the housing structure without requiring the removal or disassembly of surrounding cells, enabling selective replacement of only the faulty component.
2Reliability
If cells are solidly connected in a conventional fuel cell stack, then electrical connection and structural integrity are improved, but time required for cell replacement increases due to complete disassembly requirement
Solution Approach 1:
The stack structure is segmented to allow independent access to each cell. Electrical connections are designed as modular interfaces that can be quickly disconnected and reconnected, reducing the time required for cell replacement while maintaining reliable electrical contact during operation.
Solution Approach 2:
The housing and electrical connection structures are pre-configured with accessible interfaces and connection points that facilitate rapid cell replacement. Connection terminals and mounting structures are positioned for easy access, and connection mechanisms are designed to be quickly engaged and disengaged without complex disassembly procedures.
3Ease of repair
If conventional fuel cell stacks are disassembled for cell replacement, then defective cells can be removed, but undamaged membranes are often destroyed during the process
Solution Approach 1:
Each cell is segmented as an independent removable unit with protected membrane structures. The housing design includes individual access paths and removal mechanisms for each cell that do not require contact with or displacement of adjacent cells, preventing mechanical damage to undamaged membranes during replacement operations.
Solution Approach 2:
Defective cells are extracted through dedicated removal pathways that isolate the extraction process to only the faulty cell. The design ensures that removal tools and operations are confined to the specific cell being replaced, preventing accidental contact with or damage to membranes of surrounding healthy cells.
4Stress or pressure
If a pressure chamber with liquid pressurization system is used, then contact pressure on cells is improved, but complexity of the system increases due to hydraulic components
Solution Approach 1:
The system uses the inherent pressure differential created during fuel cell operation (where reactants are supplied at elevated pressure) to automatically pressurize the liquid in the pressure chamber. This self-pressurization eliminates the need for external hydraulic pumps, valves, and control systems, reducing overall system complexity while maintaining effective contact pressure on the cells.
Solution Approach 2:
The liquid in the pressure chamber serves multiple functions: it provides contact pressure to ensure proper cell-to-cell and cell-to-housing contact, it acts as a thermal management medium, and it enables easy cell removal when depressurized. This multi-functionality reduces the need for separate systems for each function, simplifying the overall design.
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
Enables rapid and cost-effective replacement of defective cells with minimal effort, reducing downtime and maintenance costs while maintaining a compact and efficient energy conversion system.
Implementation Method 1
a closure (8) between the housing (2, 3) and the plate (31) closing the open side of the housing (2, 3) in a fluid-tight manner, forming the pressure chamber (4) and at least partially made of an elastic material
Implementation Method 2
whose pocket wall is flexible due to the elastic material so that the pocket wall rests against the cell in the case of overpressure in the pressure chamber (4)
Data Source
AI summary
The invention relates to an apparatus (1) for converting chemical energy into electrical energy and/or electrical energy into chemical energy with a housing (2, 3, 3a), which is open towards at least one side (6) and in which a pressure chamber (4) is formed, and with at least one electrochemically active cell (5) for energy conversion, which extends from the open side (6) of the housing (2, 3, 3a) into the housing (2, 3, 3a), wherein the open side (6) is closed by a plate (7, 31), which holds and/or supplies power to the cell (5). A sealing element (8, 9) is arranged between the housing (2, 3, 3a) and the plate (7, 31), closes the open side (6) of the housing (2, 3, 3a) in a fluid-tight and/or gas-tight manner so as to form the pressure chamber (4) and is formed at least partially from an elastic material. At least one pocket (10) extending into the pressure chamber (4) is formed in the sealing element (8, 9), wherein the cell (5) is positioned in said pocket and the pocket wall (28) of said pocket is flexible as a result of the elastic material, with the result that the pocket wall (28) bears against the cell (5) in the event of an excess pressure in the pressure chamber (4).