Flow Battery Electrode Assembly for Uniform Electrolyte Distribution
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Solution Overview
Problem
Flow batteries face challenges in achieving uniform electrolyte distribution within electrodes and preventing shunt currents due to ionically conductive electrolytes, which lead to inefficiencies and increased pressure drops, requiring a more efficient and simple construction for electrode assemblies and cell stacks.
Innovation Solution
The electrode assembly features a porous electrode material surrounded by a frame with embedded distributor tubes for electrolyte supply and discharge, made of non-conductive plastic, allowing for improved electrolyte distribution and reduced shunt currents through controlled flow paths within the electrode material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte flows entirely through porous electrode from inlet to outlet, then electrolyte exposure to electrode is enhanced, but pressure drop increases due to flow resistance through porous material
Solution Approach 1:
The electrode assembly is segmented into multiple flow channels separated by non-conductive ribs. This segmentation creates parallel flow paths that reduce the resistance in each individual channel while maintaining good electrolyte contact with the electrode surface, thereby reducing overall pressure drop while preserving electrolyte exposure effectiveness.
Solution Approach 2:
Non-conductive ribs act as intermediaries that guide electrolyte flow through the porous electrode material. These ribs create controlled flow paths that distribute electrolyte uniformly across the electrode surface, enhancing exposure while managing flow resistance to reduce pressure drop.
2Manufacturing precision
If flow field channels are designed to achieve uniform electrolyte distribution, then electrolyte concentration gradients are prevented, but device complexity increases
Solution Approach 1:
The flow field is segmented into multiple channels separated by non-conductive ribs, creating a modular structure that naturally promotes uniform electrolyte distribution. This segmentation approach achieves distribution uniformity through simple geometric division rather than complex flow control mechanisms.
Solution Approach 2:
The porous electrode material itself is utilized to distribute electrolyte uniformly across the flow channels. The porous structure naturally wicks and distributes electrolyte throughout the electrode, eliminating the need for complex flow field designs while achieving uniform distribution and preventing concentration gradients.
3Object-generated harmful factors
If electrolyte flow path is extended to reduce shunt currents, then current leakage is reduced, but pressure drop increases
Solution Approach 1:
The flow path is segmented into multiple parallel channels by non-conductive ribs, extending the effective flow path length for reducing shunt currents while distributing the pressure drop across multiple channels. This maintains lower pressure drop in each channel while achieving the goal of reduced current leakage.
Solution Approach 2:
The flow path extension is achieved in the planar dimension through multiple channels rather than increasing path length in a single direction. This dimensional approach extends the effective path for reducing shunt currents while maintaining manageable pressure drops through parallel flow distribution.
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 electrolyte distribution with reduced pressure drops and minimizes shunt currents, improving energy efficiency and current density while simplifying manufacturing and assembly processes.
Implementation Method 1
the porous electrodes are composed of a material that is electrically conductive and catalytically active with regard to the liquid electrolytes
Implementation Method 2
The separator can be a micro-porous separator or an ion exchange membrane and it separates the electrodes and prevents the electrolytes from mixing, but allows selected ions to pass through
Implementation Method 3
liquid electrolytes that participate in a reversible electro-chemical reaction
Data Source
AI summary
An electrode assembly for a flow battery is disclosed comprising a porous electrode material, a frame surrounding the porous electrode material, at least a distributor tube embedded in the porous electrode material having an inlet for supplying electrolyte to the porous electrode material and at least another distributor tube embedded in the porous electrode material having an outlet for discharging electrolyte out of the porous material. The walls of the distributor tubes are preferably provided with holes or pores for allowing a uniform distribution of the electrolyte within the electrode material. The distributor tubes provide the required electrolyte flow path length within the electrode material to minimize shunt current flowing between the flow cells in the battery stack.