Abstract
The vanadium redox flow battery is a power storage technology suitable for large-scale energy storage. The stack is the core component of the vanadium redox flow battery, and its performance directly determines the battery performance. The paper explored the engineering application route of the vanadium redox flow battery and the way to improve its energy efficiency, and studied high-power vanadium redox flow battery stack. 10 single cells, half-stack and full stack were assembled and tested for constant current and constant power charge and discharge respectively. The results showed that bipolar plate’s conductive filler was increased, besides, reasonable control of the thickness of the graphite felt could reduce the contact resistance between the materials inside the stack. The internal seal was added in the liquid flow frame to reduce the electrolyte permeability and improve the coulombic efficiency; Increasing the exchange capacity of the ion exchange membrane enhanced the choice of permeability and conductivity. All of the above factors could improve the energy efficiency of the battery. The energy efficiency of the 25kW stack could reach 78.6%, and the 31.5kW stack could reach 76.7%.
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