Dielectric Fuel Cell Manifold Plate for Uniform Fuel Distribution
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Solution Overview
Problem
Fuel cell stacks face challenges in achieving uniform fuel distribution and maximizing fuel utilization due to complex fuel manifold designs, which can lead to fuel starvation and reduced stack performance, while also requiring complex manufacturing processes and large footprints.
Innovation Solution
A manifold plate design for fuel cell stacks incorporating a dielectric layer sandwiched between upper and lower manifold portions, with inlet and outlet channels for uniform fuel distribution, eliminating the need for conventional fuel manifolds and reducing the stack's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fuel manifolds are used, then fuel distribution can be achieved, but the design becomes complex and fuel utilization becomes non-uniform
Solution Approach 1:
The patent removes the conventional fuel manifold component entirely from the system. Instead of using a separate manifold structure to distribute fuel, the design integrates fuel distribution functionality directly into the interconnect plates through precisely positioned flow fields and channels, eliminating the need for complex manifold assemblies while achieving uniform fuel distribution across all fuel cells in the stack
Solution Approach 2:
The patent combines the functions of the interconnect plate and the fuel manifold into a single integrated component. The interconnect plate simultaneously performs electrical connection between cells and fuel distribution to the fuel cells, merging two previously separate functions into one unified structure that simplifies the overall system design while improving fuel distribution uniformity
2Quantity of substance
If complex fuel manifold designs are used, then fuel can be supplied to all cells, but the stack footprint increases
Solution Approach 1:
The patent transitions from a three-dimensional manifold structure that extends laterally to a two-dimensional planar distribution system integrated into the interconnect plates. By distributing fuel through channels and flow fields within the plane of the interconnect plates rather than using external manifold piping, the design achieves comprehensive fuel supply to all cells while minimizing the stack's vertical and lateral footprint
3Ease of manufacture
If conventional manifolds are used, then fuel distribution is possible, but manufacturing processes become complex
Solution Approach 1:
The patent optimizes the geometric parameters of the flow fields and channels in the interconnect plates to achieve uniform fuel distribution. By carefully designing channel dimensions, spacing, and orientations, the system achieves precise fuel distribution control through simpler manufacturing processes that do not require complex manifold assemblies with multiple fabrication steps and assembly operations
Data Source
AI summary
A manifold plate for a fuel cell stack includes a lower manifold portion, an upper manifold portion, a dielectric layer sandwiched between the lower manifold portion and the upper manifold portion, a bottom inlet hole and a bottom outlet hole formed in a bottom surface of the lower manifold portion, where the bottom inlet hole and the bottom outlet hole extend through the dielectric layer, top outlet holes and top inlet holes formed in opposing sides of a top surface of the upper manifold portion, outlet channels fluidly connecting the top outlet holes to the bottom inlet hole, and inlet channels fluidly connecting the top inlet holes to the bottom outlet hole.