Redox Flow Battery Separator Calendaring With Integrated Spacer
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Solution Overview
Problem
The high cost of ionomer-coated separators in redox flow battery systems makes them economically unviable for commercial applications, contributing significantly to the overall cost of the power module and requiring a more cost-effective alternative.
Innovation Solution
A roll-to-roll calendaring process is used to manufacture a membrane separator with a cross-linked polymer network and molded ribs, integrating a negative electrode spacer, which reduces production costs and time while maintaining or exceeding the performance of ionomer-coated separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ionomer-coated separator is used to maintain battery efficiency, then the separator performance is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive ionomer-coated separators with a cost-effective alternative using a microporous membrane coated with a cross-linked polymer network. This substitution maintains the necessary ion-exchange functionality while dramatically reducing material costs, directly addressing the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The invention uses a composite structure consisting of a microporous membrane base material combined with a cross-linked polymer network coating. This composite approach achieves the desired ion-exchange performance and battery efficiency without relying on expensive ionomer coatings, thereby resolving the cost-performance contradiction.
2Manufacturing precision
If a traditional manufacturing process is used for the separator, then the production quality is maintained, but the production time and throughput are reduced
Solution Approach 1:
The patent combines multiple manufacturing steps into a single integrated roll-to-roll process. The separator manufacturing is merged with the negative electrode spacer formation, allowing both components to be produced simultaneously in one continuous operation. This integration maintains quality standards while dramatically increasing throughput and productivity.
Solution Approach 2:
The roll-to-roll manufacturing process enables continuous production of separators without interruption. The process maintains constant quality control while operating continuously, eliminating the batch processing bottlenecks that limit throughput in traditional methods. This continuous action resolves the contradiction between maintaining precision and increasing productivity.
3Adaptability or versatility
If the separator and negative electrode spacer are manufactured separately, then each component can be optimized independently, but the overall manufacturing complexity and time increase
Solution Approach 1:
The patent merges the separator and negative electrode spacer into a single integrated component manufactured through one unified roll-to-roll process. This consolidation eliminates the need for separate manufacturing, assembly, and alignment operations, thereby reducing overall manufacturing complexity while maintaining the ability to optimize the integrated structure for dual functionality.
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 method allows for the production of a cost-efficient redox flow battery system with high throughput, reducing the cost of raw materials and processing time, and integrating the negative electrode spacer directly into the separator, thus simplifying the manufacturing process and enhancing battery performance.
Implementation Method 1
combining and treating chemical ingredients of a membrane separator, forming a sheet from the combined chemical ingredients, and infiltrating the sheet with a cross-linked polymer network
Implementation Method 2
molding ribs onto a surface of the sheet, and infiltrating the sheet with a cross-linked polymer network. The separator may perform as well or better than a separator comprising an ionomer coating and, as a result of the calendaring R2R method of production, may additionally be integrated with a negative electrode spacer for controlling electrolyte flow channels
Implementation Method 3
The separator may be a permeable membrane that allows ions to be exchanged across the membrane from the positive side of the electrode compartment to the negative side, or vice versa. A flow of ionic charge carriers across the separator may provide charge balance between electrolyte on the positive and negative sides of the battery cell
Implementation Method 4
combining and treating chemical ingredients of a membrane separator, forming a sheet from the combined chemical ingredients, molding ribs onto a surface of the sheet, and infiltrating the sheet with a cross-linked polymer network
Data Source
AI summary
Methods and systems are provided for manufacturing a membrane separator for a redox flow battery. In one example, the membrane separator is fabricate by a calendering process. The membrane separator may be configured with a polymer network to provide selectivity for ion transport across the membrane separator. The membrane separator may be further adapted with an integrated spacer in contact with a negative electrolyte.