Fuel Cell Separator Channel Web Undercut for Water Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell flow fields struggle to efficiently convey product water, leading to potential water accumulation and damage, as conventional channel structures do not effectively redistribute water away from the gas diffusion layer.
Innovation Solution
The channel web design in the separator plate features a face side that deflects liquid flow, forming an acute internal angle with the top side, creating an undercut configuration to redirect water away from the gas diffusion layer, and optionally using hydrophilic components or coatings to facilitate water migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional straight channel structures are used, then the flow field is simple to manufacture, but product water cannot be efficiently conveyed leading to local accumulations
Solution Approach 1:
The channel web is divided into multiple faces (first face, second face, third face) that segment the water flow path. Each face handles water redistribution in a specific direction, breaking down the complex task of water removal into manageable segments that work together systematically.
Solution Approach 2:
The channel web extends in multiple spatial dimensions with faces oriented at different angles (first face at first angle, second face at second angle, third face at third angle). This multi-dimensional configuration creates comprehensive water redistribution coverage that prevents local accumulations while maintaining manufacturing feasibility.
2Device complexity
If water is allowed to accumulate near the gas diffusion layer, then the channel structure remains simple, but fuel cell damage occurs
Solution Approach 1:
The channel web is positioned and configured in advance to intercept and redirect water before it can accumulate harmfully near the gas diffusion layer. The multiple faces create preliminary redistribution action that prevents water from reaching critical accumulation zones.
Solution Approach 2:
The channel web acts as an intermediary structure between the gas diffusion layer and the water flow. It mediates water redistribution by capturing water and redirecting it through its multiple faces, preventing direct harmful contact and accumulation at the gas diffusion layer interface.
3Reliability
If the channel web uses multiple angled faces, then water redistribution is improved, but manufacturing complexity increases
Solution Approach 1:
Different faces of the channel web have different local geometries and orientations optimized for specific redistribution functions. The first face has a first angle, the second face has a second angle, and the third face has a third angle, creating local quality variations that collectively achieve comprehensive water redistribution.
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 water redistribution and removal as a film flow, preventing local accumulations and improving fuel cell service life by directing water to distal regions where it can be more effectively transported.
Implementation Method 1
hydrophilic components or coatings to facilitate water migration
Implementation Method 2
hydrophilic components or coatings to facilitate water migration
Data Source
AI summary
A fuel cell has a gas diffusion layer and a separator plate. The separator plate forms, together with the gas diffusion layer, at least one gas-conducting flow field. At least one channel web of the separator plate has an end with an upper face and an end face. The end face is designed to divide a flow impinging on the end face of the channel web in a first direction into two partial flows. The end face is designed to deflect a liquid of the flow impinging on the end face adjacently to the upper face in such a manner that the liquid is spaced further from the upper face after deflection than before deflection.