Fuel Cell Stack Gasket and Rib Layout for Coolant Flow Guidance
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Solution Overview
Problem
Existing fuel cell stacks face inefficiencies in cooling the power generation portion, which hampers the overall power generation efficiency.
Innovation Solution
A fuel cell stack design featuring a gasket with guide projections and intersecting ribs in the separators to guide coolant flow efficiently, enhancing cooling efficiency and maintaining gas supply to the power generation portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flow is allowed through the entire flow passage including near the seal member, then coolant circulation is maintained, but cooling efficiency of the power generation portion decreases due to sideward flow
Solution Approach 1:
The guide projection acts as an intermediary element that redirects coolant flow from the seal member area toward the power generation portion. It mediates between the coolant supply and the target cooling area, preventing sideward flow while maintaining circulation through the flow passage.
Solution Approach 2:
The flow passage is effectively segmented into different functional zones by the guide projection - one zone for coolant entry and seal member cooling, another for directed flow toward the power generation portion. This segmentation allows optimized cooling in each zone without compromising overall circulation.
2Temperature
If ribs are added to guide coolant flow and prevent sideward flow, then cooling efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The cooling guide function is merged with the separator structure by integrating ribs directly into the separator body. This combination eliminates the need for separate cooling guide components, reducing assembly steps and manufacturing complexity while achieving effective coolant flow guidance and cooling enhancement.
Solution Approach 2:
The separator performs multiple functions: it separates reactant gases, provides structural support, and guides coolant flow through integrated ribs. This multi-functionality reduces the total number of components needed in the fuel cell stack, simplifying manufacturing and assembly processes.
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
The design improves cooling efficiency of the power generation portion, ensuring effective supply of reaction gases and enhancing overall power generation efficiency.
Implementation Method 1
The guide projection is configured to guide flow of the coolant toward an inner side of the body
Implementation Method 2
a flow passage configured to allow a coolant for cooling the power generation portion to flow through
Implementation Method 3
a coolant inlet manifold configured to draw in a coolant, a flow passage through which the coolant flows, and a coolant outlet manifold configured to discharge the coolant
Implementation Method 4
The first separator includes a surface located at the power generation portion and including a first gas passage configured to supply a first reaction gas to the power generation portion
Data Source
AI summary
A fuel cell stack includes multiple stacked unit cells. Each unit cell includes a first separator, a second separator, and a power generation portion sandwiched by the first separator and the second separator. A flow passage and a gasket are arranged between the first separator of a first unit cell and the second separator of a second unit cell. The gasket surrounds a supply manifold, the flow passage, and a discharge manifold. The gasket includes an annular body and a guide projection. The first separator of the first unit cell includes at least one first rib located adjacent to an inner peripheral side of the body. The second separator of the second unit cell includes at least one second rib located adjacent to the inner peripheral side of the body. The first rib and the second rib project so as to contact each other and extend to intersect each other.