Fuel Cell Buffer for Uniform Reactant Gas Distribution
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Solution Overview
Problem
Conventional fuel cell designs face challenges in uniformly supplying reactant gases to the entire reactant gas flow field due to small opening dimensions of reactant gas passages and discharge passages, leading to suboptimal power generation performance.
Innovation Solution
A fuel cell design featuring a buffer system with larger opening dimensions adjacent to reactant gas passages and flow fields, including a first buffer area deeper than a second buffer area, ensures uniform distribution of reactant gases across the flow field, connecting reactant gas passages and flow fields through guides for efficient gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If small opening dimensions are used for reactant gas passages and discharge passages, then the structure is compact, but uniform supply of reactant gases to the entire flow field cannot be achieved
Solution Approach 1:
A buffer is introduced as an intermediary component between the reactant gas passage and the reactant gas flow field. The buffer has a first buffer area with a larger opening dimension adjacent to the passage and a second buffer area with a smaller opening dimension adjacent to the flow field, acting as a mediator to redistribute the gas flow and achieve uniform supply across the entire flow field.
2Manufacturing precision
If buffers are provided adjacent to reactant gas supply passages and discharge passages, then uniform gas distribution is achieved, but device complexity increases
Solution Approach 1:
The buffer is merged with the reactant gas passage to form an integrated structure. The buffer includes a first buffer area and a second buffer area that are continuous with the passage, eliminating the need for separate buffer components and reducing overall device complexity while maintaining uniform gas distribution.
3Ease of operation
If the opening dimension of buffer area adjacent to passage is larger than that adjacent to flow field, then gas is dispersed effectively, but manufacturing precision requirements increase
Solution Approach 1:
The buffer is designed with different opening dimensions at different locations: the first buffer area adjacent to the reactant gas passage has a larger opening dimension for effective gas dispersion, while the second buffer area adjacent to the flow field has a smaller opening dimension for precise flow control. This local differentiation of geometric properties optimizes both gas dispersion and flow uniformity.
Data Source
AI summary
A fuel cell includes a membrane electrode assembly, and a first separator and a second separator sandwiching the membrane electrode assembly. The membrane electrode assembly has a resin frame member, and an inlet buffer is provided on the resin frame member adjacent to the fuel gas supply passage. The inlet buffer includes a first buffer area adjacent to the fuel gas supply passage and a second buffer area adjacent to a fuel gas flow field. The opening dimension of the first buffer area in a stacking direction is larger than the opening dimension of the second buffer area in the stacking direction.