In recent years, battery energy storage has developed rapidly, mainly showing the following three characteristics in China.
Battery energy storage technology is becoming more mature. Battery energy storage technology is the current research hotspot, and a variety of new battery technologies are still being introduced, such as lithium titanate batteries, lead-carbon batteries, and zinc-bromide batteries. The development trend is looking for long life, high safety, low cost and high reliability. Recently, the safety, cycle life, environmental protection and other key technical indicators of battery energy storage power stations have been greatly improved.
The scale of installed capacity has developed rapidly. Until the end of 2019, the cumulative installed power scale of China’s electrochemical energy storage market was 1592.7 MW, an increase of nearly 10 times in just five years from 167.0 MW in 2015. Especially in recent years, a series of battery energy storage power station projects on the grid side, such as the 101 MW/202 MWh energy storage power station in Zhejiang, Jiangsu, and the wind and solar storage demonstration project, have been connected to the grid, which has greatly promoted the energy storage power station. Large-scale development. On the whole, the large-scale operation of battery energy storage power plants reduces power supply and grid investment and improves the utilization efficiency of stock assets; on the other hand, the combined application of battery energy storage, wind power, and photovoltaics improves the grid’s ability to accept clean energy and generate stable power generation. Efforts, slowing down the curtailment of renewable energy, wind and light, have all played an important role.
The unit cost is declining year by year. It is precisely because of the improvement of the technological level and large-scale commercial operation of battery energy storage power stations in my country in recent years that the unit cost of battery energy storage power stations has shown a downward trend year by year. According to relevant data, the comprehensive cost per kilowatt hour of lithium battery energy storage power stations in China was 2.42 yuan/kWh in 2010, and 0.4-0.5 yuan/kWh in 2018. The downward trend in cost follows a perfect learning curve, which in turn promotes Large-scale development and technological improvement of battery energy storage power stations.