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Design of all vanadium redox flow battery
来源:隆宝山公墓   浏览时间:2014-12-29   浏览次数:3083次

  Design of all vanadium redox flow battery

  1 Preface

  REDOX2015 project has two purposes: the Spanish partner to develop a full vanadium redox flow battery and a new generation of vanadium battery components to increase technical knowledge. Project by the Spanish EDP, Zigor, Isastur, Oviedo, Tecnalia, IREC,, INCAR and Tekniker cooperation completed. The project is completed by the Spanish Ministry of economy and competitiveness, get FEDER funding from the European Commission (IPT-2011-1690-900000). This paper presents the first objective of the project, and the key results achieved in the design, production and development of the battery connected to the power grid.

  2 REDOX2015 battery design

  The most critical issue in the design of REDOX2015 all vanadium redox flow battery is the design of the stack, which is more accurate. Frame design has two main objectives: to avoid the branch current between the battery and the flow rate of all batteries in the battery to achieve uniform distribution.

  A SIMULINK electrical model for calculating the required resistance of electrical apparatus is developed. The calculation by the model results as initial data of the inlet and outlet coil circuit design of battery. In this design, the ratio between resistance and pressure drop is very important. Therefore, using computational fluid dynamics (CFD) simulation, circuit design of snake, to ensure that the pressure drop does not significantly increase.

  In addition, the calculation of fluid dynamics analysis of the other two functions: the first is the graphite felt around the distribution of electrolyte solutions, the second is the flow of electrolyte solution into the battery.

  Fig. 1 shows the flow distribution of the electrolyte solution. It can be seen that there is no dead drop, controlled graphite felt the pressure, did not occur in the serpentine circuit.

  3 production

  Battery production process to solve the two main problems: graphite felt extrusion and sealing, in order to avoid leakage. REDOX2015 project of the diaphragm, graphite felt and double plate selection of industrial materials, as mentioned earlier, the design of the framework of the project is specifically developed.

  Fig. 1 Distribution of electrolyte solutions around graphite felt

  As a part of the battery, the frame is the key part of the battery stack. On the one hand, the frame is responsible for the distribution of the electrolyte through the battery; on the other hand, the accurate space of graphite felt in the battery is decided.

  Therefore, the component is usually produced by the spray casting process, which is one of the key parts in the assembly of the electric reactor. In the production process, the frame measurement must be highly accurate, so as to avoid the leakage of liquid and graphite felt extrusion loss.

  Figure 2 a) battery layout: electrolytic cell and cabinet B with electric reactor

  Compared with the thickness of the frame, the frame area is very large, so it is difficult to achieve the required tolerance. A variety of test frameworks were prepared and tested in all key areas to ensure that the process is appropriate.

  After solving this problem, the three cells are assembled (see Figure 2), and the simulation results are compared with the actual test. The results show that the branch current is small and the electrolyte solution is in a similar way to all cells.

  4 development

  Spain EDP company conducted a study, according to the size of the vanadium battery and other requirements to find the best location for the battery system test of the power grid. Select the location is located in Gijon (northwest Spain) named HV/LV Pumarin power distribution station. The vanadium battery is connected to the LV power grid through a small MV/LV power distribution station, and it will supply power to the EDP office building. Previously used for transformer maintenance, now idle for an old building is now used exclusively for the placement of vanadium battery.

  REDOX2015 battery rated power of 30kW, consisting of two electric cabinets, there are two sets of batteries, two electrolyte solution storage tanks, the capacity of 3000L storage tanks, each tank is equipped with 2000L electrolyte solution. In order to prevent leakage of electrolyte solution, a special reinforced tray was built.

  5 the next step of work

  In order to improve the rated power of vanadium battery, Tekniker has been studied on the improved two generation battery, and the battery power rating can be improved by 15%~20%. In the first half of 2015, the two generation stack was replaced by the first design.

  In the commissioning phase, the electrolyte solution precipitation occurred. This is mainly due to the low temperature during the storage of the electrolyte. After replacing the electrolyte solution and installing the improved stack, the vanadium battery will continue to try to run, and the charging and discharging test will be carried out in the project.

  carbon carbon composite, graphite, graphite felt http://www.cfccarbon.com/

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