Electrolysis Stack Separator Layout to Cut Contact Resistance
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Solution Overview
Problem
The complexity of the structure and manufacturing process of water electrolysis stacks, which require different anode and cathode separators with specific channel configurations, leads to increased contact resistance, reduced mobility of electrons, and decreased efficiency, while also complicating the simplification of the device's structure and weight reduction.
Innovation Solution
The use of a single type of separator with first and second channels on opposite surfaces, allowing them to face each other with the reaction layer in between, eliminates the need for stacking different separators and reduces contact resistance, thereby simplifying the structure and manufacturing process while maintaining structural rigidity and improving electron mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two different separators (anode separator and cathode separator) are stacked between membrane electrode assemblies, then the device can perform water electrolysis functions, but the structure becomes complicated and the manufacturing process becomes complex
Solution Approach 1:
The patent applies universality by designing a single separator that performs both anode and cathode separator functions. The separator includes first channels for water flow and second channels for hydrogen flow, allowing one component to replace two different components while maintaining all necessary electrolysis functions.
Solution Approach 2:
The patent merges the functions of the anode separator and cathode separator into a single integrated separator structure. By combining water flow channels and hydrogen flow channels in one separator, the device simplifies its structure while maintaining the ability to perform both water electrolysis and hydrogen collection functions.
2Weight of moving object
If two different separators are stacked between membrane electrode assemblies, then the device can define separate channels for water and hydrogen flow, but the weight of the device increases
Solution Approach 1:
The single separator is designed to universally handle both water flow and hydrogen flow functions that previously required two separate separators. This multi-functional design reduces the total number of components and consequently reduces the overall device weight while maintaining proper channel definition for both fluids.
Solution Approach 2:
By merging the anode and cathode separator functions into one component, the patent eliminates the weight contribution of the second separator and its associated mounting structures, thereby reducing overall device weight while still providing separate defined channels for water and hydrogen flow.
3Reliability
If two separators are stacked in close contact with each other, then the device can maintain structural integrity, but contact resistance increases and electron mobility decreases
Solution Approach 1:
The patent extracts one separator from the stacked configuration, eliminating the contact resistance interface between two separators. By using a single separator design, the harmful contact resistance that degraded electron mobility is removed while structural integrity is maintained through the unified separator structure.
4Productivity
If two different separators with different structures are used, then the device can optimize channels for water flow and hydrogen flow separately, but the manufacturing process becomes complex and productivity decreases
Solution Approach 1:
The single separator is manufactured as a universal component that incorporates both water flow channels and hydrogen flow channels. This eliminates the need to manufacture and assemble two different separator types, thereby improving manufacturing efficiency and productivity while still providing optimized separate channels for each fluid flow.
Solution Approach 2:
By combining the manufacturing process into a single separator production line rather than two separate separator manufacturing processes, the patent improves productivity. The merged structure allows for simplified manufacturing steps, reduced assembly operations, and higher production efficiency while maintaining optimized channel configurations for both water and hydrogen flow.
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 simplifies the electrochemical device's structure and manufacturing process, reduces weight, enhances electron mobility, and improves efficiency by preventing contact resistance and deformation, while ensuring structural integrity and sealability.
Implementation Method 1
A water electrolysis stack, which is one of electrochemical devices, refers to a device that produces hydrogen and oxygen by electrochemically decomposing water
Implementation Method 2
the separator (the anode separator) for defining a channel through which water flows, and the separator (the cathode separator) for defining a channel through which hydrogen flows
Data Source
AI summary
An electrochemical apparatus includes a reaction layer including a membrane electrode assembly (MEA); and separators respectively stacked on two opposite surfaces of the reaction layer, wherein each separator includes first channels disposed on a first surface thereof and second channels disposed on a second surface thereof, in which the separators are disposed such that the first channels or the second channels thereof face each other with the reaction layer interposed therebetween, simplifying a structure and a manufacturing process.