Fuel Cell Flow Channels with Scale Depositories
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Solution Overview
Problem
Liquid electrolyte fuel cells face issues with electrolyte evaporation leading to inadequate electrolyte levels and scale buildup, which interferes with reactant flow within the cell stack assembly, potentially reducing operational efficiency and longevity.
Innovation Solution
The fuel cell component features flow channels with specific dimensions near the inlet and outlet to create depositories for scale buildup, maintaining reactant flow and electrolyte balance by increasing the cross-sectional area in these areas, thereby accommodating scale without hindering flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If liquid electrolyte is used in fuel cells, then electrochemical reaction between hydrogen and oxygen can generate electricity, but electrolyte evaporates over time leading to inadequate electrolyte levels and scale buildup
Solution Approach 1:
The patent converts the harmful effect of electrolyte evaporation and scale buildup into a beneficial feature by designing depository zones within flow channels. These zones are specifically configured to collect and contain scale deposits, preventing them from interfering with reactant flow while maintaining the electrochemical reaction functionality.
2Duration of action of stationary object
If liquid electrolyte evaporates, then operational time increases, but scale of salt and mineral deposits builds up and interferes with proper flow of reactants
Solution Approach 1:
The patent applies local quality by creating depository zones with specific geometric characteristics (greater width or depth) at particular locations within the flow channels. These localized zones have different properties than the main flow channels, allowing them to selectively capture scale deposits while the rest of the channel maintains optimal dimensions for reactant flow.
3Loss of substance
If scale deposits build up in flow channels, then electrolyte evaporation is managed, but proper flow of reactants is interfered with
Solution Approach 1:
The patent converts the harmful accumulation of scale deposits into a beneficial function by designing dedicated depository zones. These zones are strategically positioned and dimensioned to capture scale deposits that form during electrolyte evaporation, preventing the deposits from obstructing the main reactant flow paths while still accommodating the inevitable scale buildup over time.
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 fuel cell performance and longevity by ensuring consistent reactant flow and preventing scale interference, thus maintaining the operational efficiency of the fuel cell stack assembly over time.
Implementation Method 1
The liquid electrolyte tends to evaporate over time. One issue associated with such evaporation is that there eventually may not be adequate electrolyte throughout the stack to keep the cell stack assembly operational. Another issue associated with liquid electrolyte evaporation is a scale of salt and mineral deposits may build up
Data Source
AI summary
An illustrative example fuel cell component includes a plate with a plurality of flow channels in at least one side of the plate. Each of the flow channels has a length between an inlet and an outlet. Each of the flow channels has a width and a depth, which are transverse to the length. At least some of the flow channels include a portion near the inlet and the width or the depth of the portion is greater than the width or depth along a majority of the length of those flow channels.