Corrugated Metal Separator Flow Field Design for Fuel Cell Water Management
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Solution Overview
Problem
In fuel cells using metal separators, water produced during power generation is retained and not discharged smoothly, leading to inhibited reactant gas flow and poor power generation performance, as well as inefficient coolant distribution.
Innovation Solution
A metal separator in the form of a corrugated plate with first and second buffers, where the first buffer forms a continuous guide flow field to facilitate the discharge of reactant gases and the second buffer forms an embossed flow field for efficient coolant distribution, ensuring smooth water discharge and improved power generation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a large number of projections are formed on the separator plate to create fuel gas and oxygen-containing gas flow fields, then the flow fields are formed, but water produced in power generation is retained between the projections and cannot be discharged smoothly, inhibiting gas flow and degrading power generation performance
Solution Approach 1:
The separator plate is divided into multiple functional regions: projections for gas distribution, grooves for water discharge, and ridges for structural support. This segmentation allows each element to perform its specific function without interfering with others, enabling smooth water discharge while maintaining effective gas flow fields
Solution Approach 2:
Grooves are introduced as intermediary channels between the projections and the external environment. These grooves serve as dedicated water discharge pathways that mediate between the water accumulation problem and the gas flow requirement, allowing water to be removed without blocking the gas flow fields formed by the projections
2Temperature
If water is retained in the fuel cell stack, then it cannot be discharged smoothly, but introducing water from outside for cooling purposes is needed, creating a conflict between cooling requirements and water discharge efficiency
Solution Approach 1:
Different regions of the separator plate are given different properties: some areas (projections) are optimized for gas distribution, while other areas (grooves) are optimized for water discharge. This local differentiation allows the separator to simultaneously handle cooling water introduction and water discharge without conflict, maintaining both cooling function and power generation performance
3Ease of manufacture
If the separator plate uses a simple flat structure with projections, then manufacturing is simple, but coolant distribution is inefficient and water discharge is blocked
Solution Approach 1:
The separator plate design transitions from a two-dimensional flat surface to a three-dimensional structure with projections, grooves, and ridges. This dimensional enhancement creates additional flow pathways for coolant and water discharge while maintaining manufacturing simplicity through standard forming processes
Data Source
AI summary
An oxygen-containing gas flow field is formed on a surface of a cathode side metal separator of a fuel cell. The oxygen-containing gas flow field is connected between an oxygen-containing gas supply passage and an oxygen-containing gas discharge passage. A coolant flow field is formed on the other surface of the cathode side metal separator, on the back of the oxygen-containing gas flow field. The cathode side metal separator has linear guide ridges protruding from an intermediate height area toward the oxygen-containing gas flow field to form a continuous guide flow field, and bosses protruding from the intermediate height area toward the coolant flow field to form an embossed flow field.