Radial Electrolyte Distribution in Flow Battery Cells
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Solution Overview
Problem
Existing electrochemical systems for off-peak energy storage require low capital costs, long cycle life, high efficiency, and low maintenance, which are not adequately met by conventional batteries, particularly in flow batteries using halogen components and metal halides, due to complexities in halogen reactant management and electrolyte circulation.
Innovation Solution
The development of an electrochemical flow cell system with a permeable and impermeable electrode configuration, utilizing a metal-halide electrolyte and liquefied halogen reactant, such as molecular chlorine, within a sealed pressure vessel, which eliminates the need for compressors and separate storage, and features a radial flow design to enhance efficiency and maintain uninterrupted power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional flow battery designs are used with separate halogen storage and compression systems, then the system can maintain adequate energy storage capacity, but the device complexity and capital cost increase significantly
Solution Approach 1:
The patent combines the halogen storage function directly within the electrode structure by impregnating the porous electrode material with halogen component. This eliminates the need for separate external storage vessels and compression systems, reducing device complexity while maintaining energy storage capacity. The electrode serves dual purposes: electrochemical reaction and halogen storage.
Solution Approach 2:
The porous electrode is designed to perform multiple functions simultaneously: it conducts electrochemical reactions, stores halogen component through impregnation, and provides structural support. This multi-functionality reduces the number of separate components needed in the system, thereby reducing overall device complexity and capital cost.
2Reliability
If conventional flow battery designs are used with external halogen storage, then the system can maintain adequate operational reliability, but the device complexity and maintenance requirements increase
Solution Approach 1:
By integrating halogen storage within the electrode structure itself, the patent eliminates external storage systems and associated transfer mechanisms. This reduces the number of potential failure points and simplifies the system architecture, maintaining reliability while reducing complexity and maintenance needs.
Solution Approach 2:
The electrode's porous structure naturally retains the halogen component through capillary forces and adsorption, eliminating the need for external containment systems. The system essentially stores and manages its own reactant within the functional component, reducing complexity and potential failure modes.
3Productivity
If radial flow design is implemented with central conduit and peripheral inlets, then the electrolyte distribution efficiency improves, but the manufacturing complexity increases
Solution Approach 1:
The flow distribution system is segmented into a central conduit and multiple peripheral inlet ports, allowing electrolyte to enter at multiple locations and distribute radially through the electrode. This segmentation improves distribution efficiency by reducing flow path lengths and ensuring more uniform electrolyte contact across the electrode surface.
Solution Approach 2:
The radial flow pattern creates curved flow paths from the central conduit outward to the periphery, optimizing the distribution of electrolyte across the electrode surface. This curved flow pattern improves mixing and contact efficiency compared to linear flow paths, while the geometric design can be manufactured using standard radial machining techniques.
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 system achieves efficient energy storage and retrieval with reduced capital costs and increased reliability, as it maintains electrical continuity and prevents chlorine bubble formation, ensuring long cycle life and low maintenance, while eliminating the need for external halogen storage and compression.
Implementation Method 1
a permeable electrode, an impermeable electrode located adjacent to and spaced apart from the permeable electrode
Implementation Method 2
electrochemical flow cell system with a permeable and impermeable electrode configuration, utilizing a metal-halide electrolyte and liquefied halogen reactant
Data Source
AI summary
An electrochemical flow cell includes a permeable electrode, an impermeable electrode located adjacent to and spaced apart from the permeable electrode and a reaction zone electrolyte flow channel located between a first side of the permeable electrode and a first side of the impermeable electrode. The electrochemical flow cell also includes at least one electrolyte flow channel located adjacent to a second side of the permeable electrode, at least one central electrolyte flow conduit extending through a central portion of the permeable electrode and through a central portion of the impermeable electrode and at least one peripheral electrolyte flow inlet/outlet located in a peripheral portion of the electrochemical cell above or below the permeable electrode.