Fuel Cell End Plate Insertion Hole for Flow Distribution
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Solution Overview
Problem
Fuel cell stacks face challenges in achieving uniform air or fuel flow distribution across multiple unit cells, leading to operational degradation due to increased flow velocity and potential separation at inlets, which affects the performance of individual cells.
Innovation Solution
The introduction of an insertion structure with a frame, sealing member, and flow distributor, including penetration holes and airfoils, which can be inserted into an end plate's insertion hole to manage flow velocity and distribution within the manifold, ensuring uniform flow and operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If air or fuel is supplied to multiple unit cells through a manifold, then the fuel cell stack can generate electricity, but non-uniform flow distribution occurs with increased velocity and separation at inlets affecting cell performance
Solution Approach 1:
The patent applies local quality by positioning flow distributors at specific locations within the manifold where flow non-uniformity occurs. These flow distributors create localized flow control zones that adjust velocity distribution in specific areas, ensuring uniform flow delivery to each unit cell inlet while maintaining overall system power generation capability
Solution Approach 2:
The flow distributor acts as an intermediary element between the main supply line and individual unit cell inlets. It mediates the flow characteristics by distributing air or fuel uniformly across multiple channels, preventing direct high-velocity injection into cell inlets while maintaining sufficient flow rates for electricity generation
2Speed
If flow velocity is increased to improve response time, then operational speed improves, but flow separation occurs at inlets degrading performance
Solution Approach 1:
The flow distributor design incorporates dynamic flow control capabilities that adapt to varying operational conditions. By adjusting flow distribution characteristics in real-time, the system maintains optimal velocity levels that prevent flow separation while ensuring rapid response to load changes, thereby maintaining both speed and reliability
3Manufacturing precision
If insertion structures are added to manage flow distribution, then flow uniformity improves, but device complexity increases
Solution Approach 1:
The flow distribution system is segmented into modular flow distributors that can be independently positioned within the manifold. Each segment handles flow distribution for specific unit cells, allowing for simplified individual component design while achieving overall uniform flow distribution across the entire stack
Solution Approach 2:
The flow distributors are designed as universal components that can be applied to various manifold configurations and unit cell arrangements. This multi-functionality reduces overall device complexity by using standardized elements rather than custom-designed complex structures, while still achieving the required flow distribution uniformity
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
The solution ensures uniform air or fuel flow velocity across the fuel cell stack, enhancing the performance and operational stability of the fuel cell stack by reducing flow velocity differences and maintaining efficient electrochemical reactions across all unit cells.
Implementation Method 1
a flow distributor configured to allow a flow velocity of air or fuel in the manifold to be substantially uniform
Data Source
AI summary
A fuel cell stack includes a stack including a plurality of unit cells, which is stacked on one another in a predetermined direction, first and second end plates disposed on opposing ends of the stack, and a supply line disposed on a first surface of the first end plate to supply fuel or air to the plurality of unit cells, where an insertion hole is defined in a second surface of the first end plate to be adjacent to the supply line, and the second surface of the first end plate is substantially perpendicular to the first surface of the first end plate.