Case Study #19: Vanadium Redox Flow Batteries
Initial situation
In vanadium redox flow batteries, vanadium dissolved in sulfuric acid cycles through four distinct oxidation states. Positive and negative electrolytes are stored separately and pumped into a galvanic cell divided by a membrane. During charging and discharging, chemical redox reactions occur in the cell, where one side reduces the vanadium ions while the other side oxidizes them. Operating at approximately 1.4 V at 86°F (30°C), these reactions generate heat, which must be managed effectively.
Challenge
The vanadium redox flow electrolyte system is highly sensitive to temperature fluctuations and oxidation. Ensuring electrolyte longevity and optimal system efficiency is critical. Additionally, metallic contamination from foreign ions must be completely avoided to maintain electrolyte purity and performance.
Solution
Calorplast offers versatile plastic heat exchangers specifically designed for effective temperature management of the electrolyte, including:
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Immersion-type exchangers installed directly in electrolyte storage tanks to maintain stable temperatures.
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Liquid-to-liquid exchangers (tube plate or tube bundle exchangers) integrated into pipelines between tanks and galvanic cells.
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Liquid-to-air exchangers (gas/water exchangers) housed within complete system enclosures for efficient environmental heat management.
Customized solutions are selected based on customer requirements, environmental factors, and applicable regulations.
Result
With Calorplast plastic heat exchangers, vanadium redox flow batteries achieve reliable, corrosion-free temperature control even under extreme conditions. The use of corrosion-resistant plastics eliminates the risk of metallic ion contamination, ensuring electrolyte purity, reduced maintenance, and long-term stable performance.
