Lithium iron phosphate battery has a series of unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and green environmental protection, and supports stepless expansion, suitable for large-scale electric energy storage. It has a good application prospect in the fields of safe grid connection of renewable energy power station, peak regulation of power grid, distributed power station, UPS power supply, emergency power system and so on.
According to the latest energy storage report released by GTM Research, the application of grid-side energy storage projects in China in 2018 continued to increase the consumption of lithium iron phosphate batteries.
With the rise of energy storage market, in recent years, some power battery enterprises have laid out energy storage business, to open up new application market for lithium iron phosphate battery. On the one hand, lithium iron phosphate can be transferred to the energy storage field due to its ultra-long life, safe use, large capacity, green and other characteristics, which will extend the value chain and promote the establishment of a new business model. On the other hand, energy storage systems with lithium iron phosphate batteries have become the mainstream choice in the market. According to reports, lithium iron phosphate batteries have been tested for electric buses, electric trucks, user-side and grid-side frequency modulation.
1. Wind power generation, photovoltaic power generation and other renewable energy generation are connected to the grid safely. The inherent randomness, intermittence and volatility of wind power generation determine that its large-scale development will inevitably bring significant impact on the safe operation of power system. With the rapid development of wind power industry, especially most wind farms in our country belong to "large-scale centralized development and long distance transportation", the power connected by large-scale wind farms poses a serious challenge for the operation and control of big power grid.
Photovoltaic power generation is affected by ambient temperature, solar illumination intensity and weather conditions. Photovoltaic power generation is characterized by random fluctuation. Our country presents a development situation of "scattered development, low voltage local access" as well as "large-scale development, medium and high voltage access", which sets higher requirements for peak regulation of power grid and the safe operation of power system.
Therefore, large capacity energy storage products become the key factor to solve the contradiction between power grid and renewable energy generation. The lithium iron phosphate battery energy storage system has the characteristics of fast working condition conversion, flexible operation mode, high efficiency, safety and environmental protection, strong scalability, etc. It has been applied in the national scenic storage and transportation demonstration project, which will effectively improve the efficiency of equipment, solve the problem of local voltage control, improve the reliability of renewable energy power generation and improve the power quality. Make renewable energy a continuous and stable power supply.
With the continuous expansion of capacity and scale and the continuous maturity of integration technology, the cost of energy storage system will be further reduced. After long-term tests of safety and reliability, lithium iron phosphate battery energy storage system is expected to be widely used in the safe grid-connection of renewable energy generation such as wind power generation, photovoltaic power generation and improve power quality.
2. Peak regulation of power grid. The main means of peak regulation in power grid has always been pumped storage power station. Since pumped storage power stations need to build upper and lower reservoirs, they are restricted by geographical conditions, so it is not easy to build in plain areas, and they occupy a large area and have high maintenance costs. The use of lithium iron phosphate battery energy storage system to replace pumped storage power station, cope with the peak load of the power grid, free location, less investment, less land, low maintenance costs, will play an important role in the peak regulation process of the power grid.
3. Distributed power stations. The defects of large-scale power grid make it difficult to guarantee the quality, efficiency, safety and reliability of power supply. For important units and enterprises, two or even multiple power supplies are often needed as backup and protection. Lithium iron phosphate battery energy storage systems can reduce or avoid power outages caused by grid failures and various unexpected events, and play an important role in ensuring safe and reliable power supply in hospitals, banks, command and control centers, data processing centers, chemical materials industries and precision manufacturing industries.
4. UPS power supply. The continuous and rapid development of China's economy brings about the decentralized demand of UPS power users, which makes more industries and more enterprises have a continuous demand for UPS power supplies.
Compared with lead-acid battery, lithium iron phosphate battery has the advantages of long cycle life, safety and stability, green environmental protection, low self-discharge rate and so on. With the continuous maturity of integrated technology and the continuous reduction of cost, lithium iron phosphate battery will be widely used in UPS power storage battery.
