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- In relation to this article, we declare that there is no conflict of interest.
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Received September 29, 2023
Accepted March 14, 2024
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effect of Flow Rate Control Modes on a Vanadium Redox Flow Battery Based on a Numerical Model
Abstract
This paper studies the eff ect of fl ow rate control modes on VRB performance based on a validated numerical model. Four
modes were put forward, i.e., constant fl ow rate, variable fl ow rate with equal anolyte and catholyte (Variable modes I and
III) and variable fl ow rate with unequal anolyte and catholyte (Variable mode II). Under the optimal condition (80 mA/cm 2
current and 85% state of charge, SOC), the charging effi ciency under the Variable mode II is 0.59% higher than that under the
constant fl ow, while 0.45% and 0.85% higher than those under Variable modes I and III, respectively. The charging effi ciency
improvement could be largely ascribed to anolyte and catholyte fl ow adjustment independently, which balances the pump
power needed and concentration overpotential loss, benefi tting the reduction of total power loss. Moreover, when the charging
current is 120 mA/cm 2 , the maximum SOC of tank under Variable modes I, II, and III increase by 7.63%, 6.41%, and
13%, respectively, in comparison with that under the constant fl ow rate. The signifi cant increase under Variable mode III is
due to an introduction of new objective function (pseudo power loss function), which limits the concentration overpotential
diff erence between anolyte and catholyte, extending time to reach cut-off voltage.
