Reduction Flow Member for Uniform Water Distribution in Electrolysis Cells
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Solution Overview
Problem
Current electrolysis cells face challenges in reducing size while maintaining efficient water flow and mechanical stability, which is crucial for uniform electrical and fluid distribution and heat evacuation, especially under differential pressure conditions.
Innovation Solution
The introduction of a reduction flow member with channels of varying heights and cross-sections, integrated into the bipolar plate, allows for adjusted pressure drop and uniform water flow in the flow control device, enabling size reduction of the electrolysis cells without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrolysis cell size is reduced, then the device complexity and material usage are decreased, but the water flow distribution uniformity and mechanical stability deteriorate
Solution Approach 1:
The reduction flow member introduces local variations in channel height (first height in inlet region, second height in outlet region) to create different flow resistance characteristics in different zones. This local quality differentiation allows the system to achieve uniform water flow distribution across the active surface despite the overall reduced cell size, resolving the contradiction between compact dimensions and flow uniformity.
Solution Approach 2:
The invention changes the geometric parameter of the channels by varying their height along the flow path. The channel height transitions from a first height in the inlet region to a second height in the outlet region, creating an optimized pressure gradient that maintains uniform flow distribution in the reduced-size cell configuration.
2Volume of moving object
If the electrolysis cell size is reduced, then the device complexity and material usage are decreased, but the mechanical strength under differential pressure deteriorates
Solution Approach 1:
The reduction flow member extends in the vertical dimension (first direction) between the bipolar plate and the frame, creating a three-dimensional flow distribution structure. This vertical dimension allows for optimized pressure drop control and flow uniformity without increasing the horizontal footprint, maintaining mechanical compactness while achieving the desired flow characteristics.
3Reliability
If uniform water flow is achieved, then heat evacuation and operational stability are improved, but the device complexity increases
Solution Approach 1:
The reduction flow member integrates multiple functions into a single component: it serves as both a flow distribution element and a pressure drop control element. By combining these functions in one integrated structure rather than using separate components, the invention achieves uniform water flow and improved operational stability without proportionally increasing device complexity.
Solution Approach 2:
The reduction flow member performs multiple roles simultaneously: distributing water uniformly across the active surface, controlling pressure drop in the inlet region, and maintaining mechanical support. This multi-functionality allows the system to achieve improved operational stability without adding separate dedicated components for each function.
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 solution ensures uniform water flow and mechanical strength, preventing hot spots and enhancing the operational stability and efficiency of the electrolysis cells, even under differential pressure, thus optimizing their performance and lifespan.
Implementation Method 1
the reduction flow member ensuring a pressure drop at entrance of water flow in a flow control device
Implementation Method 2
uniform flow in the flow control device
Implementation Method 3
a proton-exchange membrane separates the anode from the cathode of each cell... by allowing protons to flow from the anode to the cathode
Implementation Method 4
PEM (proton-exchange membrane or polymer electrolyte membrane) technology, a proton-exchange membrane separates the anode from the cathode
Implementation Method 5
The flow of liquid water through the anode compartment of each cell is used both to feed the electrolysis reaction and to cool the anode compartment because the oxygen release reaction is exothermic
Implementation Method 6
a heat exchanger, typically only on an anode side, which allows the extraction of the heat produced in the cells during electrolysis
Implementation Method 7
Electro-catalysts are deposited on both sides of the membrane, each forming a layer of a few micrometers to a few tens of micrometers thick
Implementation Method 8
electrons are released at the anode of the cell within the oxygen evolution reaction (OER)... form together with H+ protons H2 within the hydrogen evolution reaction (HER)
Data Source
Figure 1~3
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Figure 5
AI summary
The invention relates to a reduction flow member for a water electrolysis cell, the reduction flow member comprising a first face lying in a first plane (P1), a second face lying in a second plane (P2) parallel to the first plane (P1), at least one first barrier (64) and a second barrier (64) extending between the first plane (P1) and the second plane (P2), at least one channel being arranged between the first barrier (64) and the second barrier (64), wherein a height (h) of at least a portion (621) of the channel (62), measured orthogonally to the first plane (P1) between a bottom wall (623) of the channel (62) and the first plane (P1), is strictly less than a height (d) of the first or the second barrier (64), measured orthogonally to the first plane (P1).