Fuel Cell Stack Pressing Member Stabilizes Gas Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell stacks experience dimensional variations in gas flow paths due to differences in rigidity and strength among current collectors, leading to unstable gas distribution and adverse effects on battery performance and reliability.
Innovation Solution
A fuel cell stack design that includes a pressing member in one gas flow path and a cell supporting member in the other, fixing the fuel cell in a specific direction to stabilize its position and suppress dimensional variations in both gas flow paths, with the pressing member optionally serving as a current collector and the supporting member providing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fuel cell is merely sandwiched between current collectors, then the structure is simple, but the fixing position of the fuel cell is not fixed due to differences in rigidity and strength among current collectors
Solution Approach 1:
The patent introduces a pressing member as an intermediary component between the current collectors and the fuel cell. This pressing member applies uniform pressure to the fuel cell, compensating for the rigidity and strength differences among current collectors, thereby ensuring consistent fixing position without significantly increasing structural complexity
Solution Approach 2:
The patent modifies the physical parameters of the current collectors by adding reinforcing ribs to specific regions. This changes the local rigidity and strength parameters of the current collectors, enabling them to maintain consistent fixing positions for the fuel cell while keeping the overall structure relatively simple
2Adaptability or versatility
If current collectors have different rigidity and strength, then manufacturing flexibility is improved, but dimensional variations in gas flow paths occur
Solution Approach 1:
The pressing member serves as a mediator that transmits uniform pressure across the fuel cell assembly, compensating for dimensional variations caused by different current collector properties. This ensures consistent gas flow path dimensions despite flexibility in current collector selection
Solution Approach 2:
The patent adds reinforcing ribs to specific local regions of the current collectors where needed. This creates local quality differences - high rigidity in critical areas and flexibility in other areas - allowing the current collectors to maintain gas flow path dimension consistency while retaining manufacturing flexibility
3Ease of operation
If the fuel cell is not firmly pressed against the cell supporting member, then assembly ease is improved, but gas flow distribution becomes unstable
Solution Approach 1:
The pressing member acts as an intermediary that provides controlled, uniform pressure to firmly press the fuel cell against the cell supporting member. This ensures stable gas flow distribution while maintaining relatively simple assembly procedures through the self-aligning nature of the pressing mechanism
Data Source
AI summary
A fuel cell stack includes a fuel cell, a first gas flow path, a second gas flow path, a pressing member, and a cell supporting member. The first gas flow path is provided on a first cell surface side of the fuel cell. The second gas flow path is provided on a second cell surface side of the fuel cell. The pressing member is disposed in the first gas flow path, and presses the first cell surface of the fuel cell. The cell supporting member is disposed in the second gas flow path, and supports the second cell surface of the fuel cell that is pressed by the pressing member.