Fuel Cell Flow Field Plate Transition Region Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fuel cell stacks, achieving uniform distribution of reactants and coolant in the transition regions of flow field plates is challenging, especially as stack dimensions decrease, leading to non-uniform fluid distribution and pressure differences.
Innovation Solution
Increasing the height and depth of support features in the transition regions of flow field plates, making them taller and deeper than the landings in the flow fields, to enhance the hydraulic diameter and improve fluid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the stack dimensions are decreased to improve power density, then the compactness and power density are improved, but the uniform distribution of reactants and coolant in the transition regions deteriorates, leading to non-uniform fluid distribution and pressure differences
Solution Approach 1:
The patent applies local quality by providing taller support features specifically in the transition regions compared to other areas. The support features have varying heights where the transition regions have taller support features than the landings in the flow fields, while other regions maintain standard heights. This localized modification improves reactant distribution in the critical transition zones without unnecessarily increasing complexity elsewhere in the system.
Solution Approach 2:
The patent addresses the distribution problem by extending the support features in the vertical dimension (height) rather than modifying the horizontal layout. By making support features taller in transition regions, the patent creates additional vertical space for improved fluid distribution pathways, effectively using the vertical dimension to solve a horizontal distribution problem caused by reduced stack dimensions.
2Device complexity
If conventional support feature heights are used in transition regions, then the device complexity is reduced, but the fluid distribution uniformity and pressure balance deteriorate
Solution Approach 1:
The patent differentiates between transition regions and other flow field regions by providing taller support features only in transition regions. This localized differentiation improves fluid distribution where it is most needed while maintaining simpler configurations elsewhere, balancing complexity and performance.
Solution Approach 2:
The patent changes the height parameter of support features specifically in transition regions, making them taller than the landings in the flow fields. This parameter modification in critical areas improves the hydraulic diameter and fluid distribution without requiring a complete redesign of the entire flow field plate structure.
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 approach ensures more even flow distribution among channels, reducing pressure differences and enhancing uniformity of reactant distribution in fuel cell stacks, particularly suitable for metal flow field plates without adhesives.
Implementation Method 1
Increasing the height and depth of support features in the transition regions of flow field plates, making them taller and deeper than the landings in the flow fields, to enhance the hydraulic diameter and improve fluid distribution
Data Source
AI summary
In solid polymer electrolyte fuel cell stacks, increasing the height of support features in the transition regions and/or increasing the depth of the transition regions improves the flow of reactants therein and thus improves the sharing of flow in the channels in the reactant flow fields. The support feature height and transition region depth are increased so as to be out of plane with respect to the landings and channels in the reactant flow fields. The invention is suitable for cells employing metal flow field plates or plates in which no adhesives are employed in the transition regions.