Inflatable Electrode Assembly for Low-Tolerance Flow Batteries
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Solution Overview
Problem
Large format iron redox flow batteries face challenges with tolerance stacking issues due to complex and expensive molding tools and handling equipment, leading to difficulties in fine-tuning and modifying assembly components, which results in inefficient manufacturing and operation.
Innovation Solution
An electrode assembly with an inflatable housing that encloses negative and positive electrode compartments, allowing for expansion during operation, and is manufactured via roll-to-roll processing using extruded thermoplastic sheets, reducing tolerance stacking and enabling flexible assembly and component replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large format molding tools are used to manufacture assembly components, then the battery can achieve large scale capacity, but the manufacturing cost increases and tolerance stacking issues occur
Solution Approach 1:
The battery system is divided into multiple modular electrode assemblies that can be independently manufactured using standard-sized molding tools. Each assembly contains a complete set of components (electrodes, spacers, seals) that can be produced with conventional equipment, avoiding the need for expensive large-format tools while achieving large-scale capacity through parallel assembly of multiple modules.
Solution Approach 2:
Multiple electrode assemblies are stacked and nested together to form the complete battery system. The modular design allows standard-sized components to be arranged in series configurations, achieving large capacity through cumulative effect of multiple smaller units rather than requiring single large components.
2Power
If complex fluid distribution systems are used to pump electrolyte through series-connected flow cells, then the battery can achieve desired performance, but the system complexity and floor space requirements increase
Solution Approach 1:
The fluid distribution system is integrated directly into the electrode assembly structure. Manifolds and flow channels are built-in to the housing and electrode components themselves, eliminating the need for separate external piping and distribution systems. This merging of functions reduces overall system complexity while maintaining the required electrolyte circulation for series-connected cells.
3Quantity of substance
If hundreds of components are stacked to form large format batteries, then the battery capacity increases, but tolerance stacking issues become unavoidable
Solution Approach 1:
The electrode assemblies incorporate flexible components including elastomeric seals and compressible spacers that can dynamically adjust to accommodate dimensional variations. This flexibility compensates for tolerance accumulation in stacked assemblies, maintaining proper sealing and electrical contact even when manufacturing variations occur across multiple components.
Solution Approach 2:
The design allows for adjustment of assembly parameters such as compression force and spacing to compensate for tolerance variations. By making certain dimensions adjustable rather than fixed, the system can adapt to manufacturing variations and maintain performance across large numbers of stacked components.
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
The inflatable electrode assembly reduces tolerance stacking issues, facilitates flexible and efficient manufacturing, and allows for easier diagnosis and replacement of components, improving the operational efficiency and scalability of redox flow battery systems.
Implementation Method 1
the inflatable housing may inflate responsive to applied internal pressure to increase the internal volume of the electrode assembly during operation of the redox flow battery
Data Source
AI summary
Systems and methods are provided for assembling and operating an electrode assembly for a redox flow battery system. In one example, the electrode assembly may include an inflatable housing in which a negative electrode spacer and a positive electrode may be positioned, wherein the inflatable housing may inflate responsive to applied internal pressure during operation of the redox flow battery system. In some examples, the electrode assembly may be assembled via roll-to-roll processing and may be mechanically and fluidically coupled to electrode assemblies of like configuration. In this way, tolerance stacking may be decreased, processing may be simplified, and costs may be reduced relative to molding-based processes for electrode assembly manufacturing.