Water Electrolysis Cell Separator Pressure Equalization
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Solution Overview
Problem
Conventional water electrolysis cells face deformation issues with separators due to load application mechanisms, leading to increased weight and potential leakage when trying to increase hydrogen pressure.
Innovation Solution
The water electrolysis cell design incorporates grooves on the separator for channels and omits sealing members around hydrogen and inter-cell channels, equalizing pressure and reducing deformation by connecting fluid and cooling medium spaces, thereby minimizing leakage and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the thickness of the separator is increased to reduce deformation, then the separator deformation is reduced, but the weight of the cell increases
Solution Approach 1:
The patent applies different sealing strategies to different regions of the separator. Sealing members are strategically placed only at the oxygen electrode-side supply hole and discharge hole, while the hydrogen electrode-side and inter-cell channel holes are left unsealed. This localized sealing approach allows the separator to maintain structural integrity where needed while remaining flexible in other areas, reducing overall deformation without requiring increased thickness throughout the entire separator.
Solution Approach 2:
The separator is functionally segmented into different regions with different sealing requirements. By dividing the separator into sealed regions (oxygen side) and unsealed regions (hydrogen side and inter-cell channels), the patent allows each region to respond differently to pressure loads, reducing overall separator deformation while maintaining the necessary weight efficiency.
2Reliability
If sealing members are added around all holes to prevent leakage, then leakage is prevented, but separator deformation increases
Solution Approach 1:
The patent implements selective sealing where sealing members are installed only at specific locations (oxygen electrode-side supply hole and discharge hole) rather than uniformly around all holes. This localized approach prevents leakage at critical oxygen-side interfaces while allowing the hydrogen-side and inter-cell channel regions to remain flexible, thereby preventing leakage without causing excessive separator deformation.
Solution Approach 2:
Instead of sealing all holes to prevent leakage (conventional approach), the patent inverts the strategy by deliberately leaving certain holes unsealed (hydrogen electrode-side and inter-cell channel holes). This inverted approach allows these regions to act as pressure equalization zones, reducing overall separator deformation while maintaining sufficient sealing at the oxygen-side holes where leakage prevention is most critical.
3Stress or pressure
If pressure inside the cell is increased to increase hydrogen pressure, then hydrogen pressure is increased, but separator deformation increases
Solution Approach 1:
The patent inverts the conventional sealing approach by leaving the hydrogen electrode-side and inter-cell channel holes unsealed. This creates pressure equalization pathways that allow the interior cell pressure to be balanced with the exterior or adjacent cell pressures, thereby enabling high hydrogen pressure operation without causing excessive separator deformation from pressure differential loads.
Solution Approach 2:
The pressure management strategy is segmented by applying different sealing configurations to different hole types. The oxygen-side holes are sealed to maintain pressure differentials where needed, while the hydrogen-side and inter-cell holes are unsealed to create pressure equalization zones, allowing the system to operate at high pressures without overwhelming the separator 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 configuration reduces separator deformation, enhances durability, and allows for cost-effective operation by maintaining equal pressure within the cell, reducing the risk of seal separation and leakage.
Implementation Method 1
no sealing members are located around the hydrogen electrode-side supply hole, the hydrogen electrode-side discharge hole, the inter-cell channel supply hole, and the inter-cell channel discharge hole... equalizing pressure and reducing deformation
Implementation Method 2
water electrolysis cell... increase the pressure of hydrogen generated by water electrolysis
Data Source
AI summary
A water electrolysis cell includes a separator having, on its front and back, grooves serving as channels. The separator has, in its ends in a planar direction, an oxygen electrode- side supply hole, an oxygen electrode-side discharge hole, a hydrogen electrode-side supply hole, a hydrogen electrode-side discharge hole, an inter-cell channel supply hole, and an inter-cell channel discharge hole, as viewed in plan. A sealing member surrounding the oxygen electrode-side supply hole and a sealing member surrounding the oxygen electrode- side discharge hole, as viewed in plan, are located in the separator, but no sealing members are located around the hydrogen electrode-side supply hole, the hydrogen electrode-side discharge hole, the inter-cell channel supply hole, and the inter-cell channel discharge hole.