Structural Design And Test Of Zinc-bromine Flow Cell System

Zinc-Bromine Flow Battery(ZBFB)has the characteristics of long service life,low cost,and high safety performance.Its energy storage advantages are being increasingly valued by people.Occupy a place.However,with the continuous research,some problems have been exposed.Due to the need for liquid flow as the battery's driving force for ion exchange,the volume of the zincbromine flow battery system is inevitably large.In practical applications,the membrane material and the frame Traditional processing methods also often cause a large number of reactive active materials to pass through,causing the battery to fall into self-discharge.In addition,there is still a lot of controversy over the setting of the electrodes.The research goal of this article is to design and develop an open zinc-bromine flow single cell system as an experimental platform for performance testing of electrode materials,separators and electrolytes of flow batteries.The specific research content is as follows:(1)According to the reaction principle and characteristics,combined with the existing flow battery structure,design and build a brand-new zinc-bromine flow single cell battery structure.The structure adopts a symmetrical shell structure and is connected in series through a membrane frame and a carbon felt-foam titanium composite electrode to form a new type of single-cell battery core structure.The overall structure is simple and easy to disassemble;(2)Design and manufacture a new type of flow channel diaphragm frame structure.Different from the traditional flow channel structure,the membrane frame with the new flow channel design not only has lower cost,but also enables the electrolyte to generate a large amount of turbulence on both sides of the electrode frame at the same time,greatly increasing the reaction point;(3)Flow channel simulation experiments on the new diaphragm frame structure using Ansys simulation software.Use Solidworks to complete the modeling of the two flow channel diaphragm frames,and use Ansys to simulate the flow field inside the zinc-rbromine flow battery,including different internal pressures and internal velocities caused by different design structures,and finally generate a velocity cloud map;(4)According to the design and simulation results,a complete set of zinc-bromine flow battery system is independently built,and various performance parameters of the battery are tested.The test results show that compared with the traditional zinc-bromine flow single cell system,the new designed zinc-bromine flow single cell system is smaller in size,lower in resistance and more than 70% in energy efficiency.In addition,the newly designed structure has higher energy density and better sealing performance.