Fuel Cell Separator With Conductive Microporous Body
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Solution Overview
Problem
Fuel cell separators with microporous structures face challenges in uniformly distributing reaction gas flow and maintaining stability under external interferences, such as water overflow, due to random bubble connections in metal foams, leading to increased parasitic power, volume, and risk of clogging, which affects performance and safety.
Innovation Solution
A separator design featuring a conductive microporous body with a channel unit and separation walls that divide the reaction surface into areas, allowing for uniform gas distribution and guiding reaction gases through channels and ribs, while also using grooves as cooling passages to manage coolant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If metal foam with random bubble connections is used as separator, then high aperture ratio and surface area per volume are achieved, but uniform gas flow distribution cannot be controlled and parasitic power increases
Solution Approach 1:
The separator is divided into multiple flow channels with separation walls that segment the random bubble structure into controlled flow paths. This segmentation allows uniform gas distribution while maintaining the high surface area of metal foam, resolving the contradiction between aperture ratio and parasitic power loss.
2Reliability
If microporous structure is used to uniformly distribute surface pressure, then gas diffusion layer compression is improved, but pressure difference in separator increases and micropores may clog
Solution Approach 1:
The separator design applies microporous structure selectively in specific regions (reaction surface areas) while incorporating macro-scale flow channels for bulk gas flow. This local quality approach allows uniform pressure distribution where needed while preventing clogging in flow paths.
3Manufacturing precision
If gap between reaction channels is reduced to improve uniformity, then surface pressure uniformity improves, but manufacturing defects increase and performance decreases
Solution Approach 1:
The separator transitions from a two-dimensional flat structure with narrow gaps to a three-dimensional structure with vertical flow channels and separation walls. This dimensional change achieves uniform pressure distribution through structural design rather than gap reduction, avoiding manufacturing defects.
4Productivity
If channel unit with separation walls is added to control gas flow, then gas distribution uniformity improves, but device complexity increases
Solution Approach 1:
The separation walls serve multiple functions: they divide flow channels for uniform gas distribution, provide structural support for the microporous body, and act as cooling passages. This multi-functionality reduces overall device complexity while achieving improved gas distribution.
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 enhances gas distribution and stability in fuel cells, preventing flow stagnation and increasing performance by 15-20% and improving cooling efficiency, maintaining stable operation even under external interferences like water overflow.
Implementation Method 1
a conductive microporous body formed on a reaction surface that corresponds to the membrane-electrode assembly
Implementation Method 2
grooves as cooling passages to manage coolant flow
Data Source
AI summary
A separator for a fuel cell is provided. The separator is disposed at both sides of a membrane-electrode assembly and is configured to supply a reaction gas to the membrane-electrode assembly. In addition, the separator includes a conductive microporous body that is formed on a reaction surface corresponding to the membrane-electrode assembly and a channel unit that is connected to an inlet manifold and an outlet manifold through which the reaction gas flows and is configured to guide the reaction gas to the reaction surface.