Explanation of flow battery energy storage technology

Flow battery energy storage technology Flow battery is generally an electrochemical energy storage device, which ends the conversion of electrical energy and chemical energy through the oxidation-reduction reaction of liquid active materials, thereby ending the storage and release of electrical energy. Because of its outstanding advantages such as independent power and capacity, deep charge and discharge, and good safety, it has become one of the best choices in the field of energy storage. Since its invention in the 1970s, flow batteries have gone through more than 100 projects, from laboratories to companies, from prototypes to standard products, from demonstrations to commercial implementation, from small to large, and from single to general-purpose functions. The all-vanadium mobile battery has an installed capacity of 35 MW, which is currently the most widely used mobile battery. Dalian Rongke Energy Storage Technology Co., Ltd. (hereinafter referred to as Rongke Energy Storage) supported by the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences cooperated with the Dalian Institute of Chemical Physics to end the localization and planned processing of key materials for all-vanadium flow batteries. At the same time, electrolyte products are exported to Japan, South Korea, the United States, Germany, Britain and other countries. The high selectivity, high durability, and low cost of non-fluorine ion conductive membrane are better than perfluorosulfonic acid ion exchange membranes. The price of the latter is only 10%, which truly breaks the cost bottleneck of vanadium flow batteries. Through structural optimization and the use of new materials, the additional operating current density of the all-vanadium redox flow battery reactor has been changed from the original 80 mA to the advanced c/c㎡120ma/㎡ while maintaining the same function, the cost of the reactor has been reduced by nearly 30 %, the standard single reactor is 32 kilowatts, which has been exported to the United States and Germany. In May 2013, the world's largest 5MW/10MWh vanadium flow battery energy storage system was successfully connected to the grid at Guodian Longyuan's 50MW wind farm. Subsequently, wind power grid-connected 3MW/6MWh energy storage projects and Guodian, wind power 2MW/4MWh energy storage projects have been implemented in Jinzhou, which is also an important case of my country's exploration of energy storage business models. Another leading company in vanadium flow batteries is Japan's Sumitomo Electric. The company restarted its mobile battery business in 2010 and will build a 15 MW/60 MW/h all-vanadium mobile battery plant in 2015 to cope with the peak load and the integration of large-scale solar power plants in Hokkaido. Power quality pressure. The successful implementation of this project will be another milestone in the field of vanadium flow batteries. In 2014, with the support of the U.S. Department of Energy and the Washington Clean Fund, UniEnergy Technologies, LLC (UET) established a 3 MW/10 MW all-vanadium flow battery energy storage system. UET will use its mixed acid electrolyte technology for the first time to increase the energy density by about 40%, expand the temperature window and voltage range of all vanadium flow batteries, and reduce thermal management energy consumption. At present, the energy power of forward flow batteries and the reliability of the system, reducing its cost is an important issue, and it is planned for the wide application of flow batteries. The development of high-performance battery materials, optimization of battery structure design, and reduction of battery internal resistance are the key technologies. Recently, Zhang Huamin and his research team made the charging and discharging energy power of a single battery all-vanadium flow battery 80 mA operating current density // c㎡, 81% a few years ago, reaching 93%, which fully proves it There are open spaces and prospects. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to increase the capacity of lithium batteries?