Vanadium Flow Battery Stack with Optimized Electrodes and Flow Channels
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Solution Overview
Problem
Existing flow batteries face challenges in improving chemical and mechanical stability, power density, and efficiency while maintaining cost-effectiveness and scalability.
Innovation Solution
A vanadium-based flow battery design with specific electrode dimensions, flow channel designs, and non-metallic epoxy resin end plates to enhance battery performance, including a stack of electrochemical cells with optimized flow channels and materials to reduce resistance and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electrode thickness is increased to improve mechanical stability, then structural strength is improved, but power density deteriorates due to increased resistance
Solution Approach 1:
The patent optimizes electrode thickness to a specific range (1-4 mm) to balance mechanical stability and electrical resistance. This parameter optimization resolves the contradiction by finding the optimal thickness that provides sufficient structural strength while minimizing resistance to maintain power density.
2Productivity
If flow channel dimensions are modified to improve electrolyte flow, then mass transport is improved, but manufacturing complexity increases
Solution Approach 1:
The flow channels are segmented into multiple parallel channels within the bipolar plates, allowing electrolyte to flow through multiple pathways. This segmentation improves mass transport efficiency while maintaining manufacturability through standardized plate designs that can be replicated.
3Reliability
If non-metallic end plates are used to reduce corrosion, then chemical stability is improved, but electrical conductivity deteriorates
Solution Approach 1:
The end plates are constructed from composite materials that combine non-metallic corrosion-resistant base materials with conductive additives or coatings. This composite structure provides both the chemical stability of non-metallic materials and the electrical conductivity needed for battery operation.
4Power
If stack size is increased to improve power output, then power capacity is improved, but system complexity increases
Solution Approach 1:
Multiple electrochemical cells are merged into a single integrated stack structure with shared bipolar plates and common flow distribution systems. This merging approach increases power capacity through cell multiplication while reducing overall system complexity by eliminating redundant components and simplifying the interconnection architecture.
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 design achieves improved power density, long-term stability, and efficiency, with reduced production costs and enhanced usability at elevated temperatures, demonstrating high performance in pilot-scale tests.
Implementation Method 1
the electrolytes are circulated through electrochemical cells, where they are separated by an ion exchange membrane
Implementation Method 2
Electricity is converted to chemical energy in the electrochemical cells for storage, and then released during discharge
Implementation Method 3
a first pump configured to flow the anolyte from the first tank into the plurality of first flow channels; a second pump configured to flow the catholyte from the second tank into the plurality of second flow channels
Data Source
AI summary
A flow cell battery that includes at least one electrochemical cell. The electrochemical cell includes: an ion exchange membrane; a 1 mm to 4 mm thick anode; an anode current collector; a first bipolar plate disposed between the anode and the anode current collector; a first flow frame that defines first flow channels; a first tank including an anolyte that includes V4+ and V5+; a first pump to flow the anolyte from the first tank into the first flow channels; a 1 mm to 4 mm thick cathode; a cathode current collector; a second bipolar plate disposed between the cathode and the cathode current collector; a second flow frame that defines second flow channels; a second tank including a catholyte that includes V2+ and V3+; and a second pump to flow the catholyte from the second tank into the second flow channels.