Fuel Cell Stack Case Pressure Plate Uniform Compression
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Solution Overview
Problem
Existing methods for adjusting compressive load in fuel cell stacks, such as using screws or shim plates, face issues with non-uniform stress distribution and increased weight, making it difficult to finely control the compressive load.
Innovation Solution
A fuel cell design that includes a pressure plate between the cell stack and the case, with strategically positioned openings for pressing and fixing the pressure plate, allowing for external compression and fixation of the cell stack, thereby ensuring uniform compression and adjustable load without increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screws are used to adjust compressive load by rotating from outside the case, then the compressive load can be adjusted, but the stress is not uniformly applied to the entire surface of the cell stack and chips may be formed
Solution Approach 1:
A pressure plate is introduced as an intermediary component between the external pressing member and the cell stack. The pressure plate receives the pressing force from the pressing member through the opening and distributes it uniformly across the entire surface of the cell stack, eliminating the non-uniform stress distribution and chip formation issues caused by direct screw application.
2Ease of operation
If shim plates are interposed between the case and the cell stack to adjust compressive load, then the compressive load can be adjusted, but the weight of the fuel cell increases
Solution Approach 1:
The invention extracts the weight-increasing shim plates from the system and replaces them with a lightweight pressing member that applies compressive load from outside the case through an opening. The pressure plate maintains the necessary compression function while the external pressing mechanism eliminates the need for heavy internal adjustment components.
3Ease of operation
If shim plates are used to adjust compressive load, then the load can be adjusted, but it is difficult to adjust the compressive load finely by changing the thickness or number of the shim plates
Solution Approach 1:
The invention transitions from static adjustment using fixed-thickness shim plates to dynamic adjustment using a rotatable pressing member. The pressing member can be rotated to precisely control the applied compressive load, enabling fine adjustments that are not possible with discrete shim plate thickness changes.
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 allows for easy production of a fuel cell with uniform compression of the cell stack, preventing chip formation and weight increase, while enabling precise control of compressive load using external devices, thus improving the efficiency and cost-effectiveness of the fuel cell production process.
Implementation Method 1
a pressing member that presses the pressure plate in the stacking direction from outside the case
Data Source
AI summary
A fuel cell that includes a cell stack in which a plurality of unit cells are stacked, a case that houses the cell stack, and a pressure plate that is placed in the case at a position between an end of the cell stack in the stacking direction and the case. The case has a first opening through which a pressing member that presses the pressure plate in the stacking direction from outside the case is brought into contact with the pressure plate, and a fixing portion that fixes the pressure plate in place with the cell stack compressed in the stacking direction.