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The demonstration project has a total investment of about 3.3 billion yuan, and it will build 100MW of wind power, 50MW of photovoltaic power and 20MW of energy storage. Its energy storage system consists of 5 sets, of which 1 set is a flow battery system and the specification is 2MW×4h. provide. The other four sets were lithium iron phosphate battery systems, which were provided by BYD, ATL, CNAC Lithium Battery and Wanxiang. This indicates that the domestic energy storage system has emerged mainstream solutions for lithium-ion batteries and sodium-sulfur batteries and flow batteries.
It is understood that the current domestic wind energy, solar energy and other new energy power generation instability and intermittent bottlenecks lie in the energy storage system. Xia Lei, an expert of Asian Chemicals Consulting Company, believes that there is a huge business opportunity in China's energy storage application market, and the size of the energy storage market depends to a large extent on whether the benefits brought by the introduction of energy storage systems can offset or exceed costs. The State Grid's expectation on the performance and price of the next generation of energy storage batteries is that the cycle life is more than 5,000 times, the price is lower than 1,500 yuan/kWh, and the efficiency is more than 80%. This is difficult to achieve with traditional high-level water storage technology.
If the energy storage system is commercially profitable, it will quickly usher in a huge market space. Xia Lei analyzed that Guodian Power once set up a special agency to study how to achieve smooth access to wind power. The research result is that the energy storage capacity should be allocated to 20%~30% of the installed capacity of wind power. If we calculate the cumulative installed capacity of domestic wind turbines at 41827 MW at the end of 2010, only one wind power sector in China's energy storage industry will have a potential market of 8365MW~12548MW.
From a technical point of view, lithium batteries have the advantages of high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. As new materials for positive electrodes, negative electrodes, and separators continue to be introduced, lithium batteries for energy storage systems are beginning to become a new direction and have been used in many applications abroad. In October 2011, the world's largest 32MW battery energy storage system developed by AES Energy Storage Corporation was put into operation in West Virginia, USA, and matched with a 98MW wind power project. The company currently has 72MW of energy storage projects already under construction and under construction worldwide, and plans to develop energy storage projects totaling 500MW.
According to reports, sodium-sulfur batteries and flow batteries for energy storage systems have been widely used. Japan's NGK began commercial production and supply of sodium-sulfur batteries in 2002. It is used in 215 projects worldwide and totals 302 MW. The main developer of domestic sodium-sulfur batteries is the Shanghai Institute of Ceramics, Chinese Academy of Sciences. Recently, the Institute and Shanghai Electric Group and Shanghai Electric Power Company jointly invested in the establishment of a sodium-sulfur battery industrialization company and settled in Shanghai Jiading Industrial Park. Its industrialization goal is divided into three phases: In the first phase, the original sodium sulfur pilot test base has been strengthened to carry out various scientific research efforts to improve the performance of the single cell battery; the second phase plans to pass through products with production capacity of 5MW~10MW. The pilot line cooperated with the national and Shanghai demonstration projects to establish a megawatt-scale demonstration power station for energy storage. The third phase was to connect the 50MW production line and achieve industrialization goals. At present, the main supplier of liquid flow batteries in China is PuEnergy, and VRB, the leading global liquid battery manufacturer, has been acquired by it. Domestic Dalian Dalian Branch and Shanghai Shenli Company are currently also developing and manufacturing liquid flow energy storage system products.
Industry experts said that after the official results of the first national wind and solar storage demonstration project in Zhangbei, Hebei province, China are formally released, data and experience in the large-scale energy storage applications of lithium-ion batteries and flow batteries can be obtained. This will be a new energy source for China. The leap-forward development of the industry and the promotion of the emerging chemical energy storage industry are of great significance.
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China's energy storage application technology brewing breakthrough
The energy storage system technology, an important component of wind power and photovoltaic power generation and smart grids, is brewing breakthroughs. On December 25, the first phase of the National Wind Energy Storage and Demonstration Project jointly launched by the Ministry of Finance, the Ministry of Science and Technology and the State Grid Corporation of China was put into operation in Zhangbei County, Hebei Province.