Study on electrolyte supply strategy for energy storage system of multi zinc nickel single flow battery stack loaded with single pump

摘要

Zinc nickel single flow battery (ZNB) has the advantages of low cost, low toxicity and long life, which is considered as one of the ideal choices for large-scale fixed energy storage. The efficient operation of ZNB is a necessary condition for maximizing system efficiency and safe operation. In this paper, a dynamic model of ZNB of single pump loaded with multi stack considering electrochemical reaction, mass transfer and hydraulic loss is constructed. Based on the principle of minimizing charging energy and maximizing discharge energy, the effects of electrolyte flow rate and current density on potential window and morphology of zinc deposition are considered, an adaptively adjusted electrolyte flow supply scheme is proposed. By considering the effect of flow rate on zinc deposition, the optimized electrolyte supply strategy can not only improve the system efficiency, but also effectively extend the service life of ZNB.