Lithium-ion battery energy storage application scenarios
Application scenario and working principle of lithium ion battery energy storage power station. Energy storage, especially lithium ion battery energy storage market, is considered to have broad market space and a variety of application scenarios. The energy storage field has been boosted by many grid side projects, and both the newly installed capacity and the operation scale have been greatly improved. Many lithium ion battery companies at home and abroad also take the energy storage system (ESS) as another blue ocean besides the power lithium battery and actively layout it.
Lithium-ion battery energy storage application scenarios
As a new application scenario, energy storage lithium ion battery has also been paid more attention. Energy storage is one of the important means to solve the intermittent fluctuation of new energy wind power and photovoltaic and realize the function of "peak cutting and valley leveling". In the practical application of lithium energy storage in power energy storage in China, renewable energy grid connection, user side, grid side and auxiliary services are the four most important fields.
With the development of battery technology and the rapid decline in cost, LiFePO4 lithium battery pack has now become the mainstream choice in household energy storage projects, and the market share of new chemical batteries reaching over 95%. The application value of energy storage in the fields of renewable energy consumption, distributed power generation and micro-grid is receiving more and more attention.Industrial and commercial energy storage systems are different from large-scale energy storage peak-shaving and frequency-regulating power stations. Its main purpose is to use the peak-valley price difference of the power grid to achieve return on investment. The main load is to meet the internal power demand of industry and commerce, to maximize photovoltaic power generation for self-use, or to arbitrage peak-to-valley price differences.
1. Household energy storage
Household energy storage refers to the energy storage system installed in residential houses. Its operation mode includes independent operation, supporting operation with small wind turbines, rooftop photovoltaic and other renewable energy power generation equipment, and domestic heat storage equipment. The applications of household energy storage systems include: electricity bill management, control of electricity costs (low charge and high discharge); power supply reliability and distributed renewable energy access; electric vehicle energy storage battery applications, etc.
Due to the relatively large electricity consumption and the large price difference between peak and valley electricity charges, energy storage systems are usually used by American households to store electrical energy during periods of low electricity prices and use them during periods of high electricity prices in order to achieve the purpose of saving electricity bills.
In addition, in remote areas, and areas with a high incidence of natural disasters such as earthquakes and hurricanes, household lithium-ion battery energy storage systems are used as emergency power sources to avoid the inconvenience caused by frequent power outages due to disasters or other reasons.
2. Photovoltaic energy storage
Photovoltaic energy storage is of great significance, smoothing the power curve, improving the accuracy of power prediction, enhancing the over-distribution capacity of the photovoltaic power generation system, and improving the friendliness of the grid. Applied to photovoltaic and solar energy storage lithium-ion battery management system, the product performance is stable and the safety is high.
As an energy storage device for photovoltaic systems, lithium battery energy storage efficiency can be increased to 95%, which can greatly reduce the cost of solar power generation. Lithium-ion battery packs serve both energy regulation and load balancing purposes in the system. It converts the electrical energy output by the photovoltaic power generation system into chemical energy and stores it for use when the power supply is insufficient.
3. Distributed energy storage system
The distributed lithium-ion battery energy storage system can optimize the demand-side power distribution and adjust the load regulation of the microgrid, improve the economic benefits of the microgrid system, solve the mismatch between the peak power consumption and the peak power generation, and give full play to the flexibility and rapid response capabilities to achieve power optimal allocation of resources.
4. Microgrid energy storage system
A microgrid is a collection of a set of loads and micro energy. It operates in a networked mode under normal conditions and can operate independently under emergency conditions. Lithium-ion battery pack energy storage is an important part of the microgrid energy storage power station.
The high-performance lithium iron phosphate lithium-ion battery pack energy storage system can store the excess energy and send it to the load when needed to make full use of various energy sources. , Has played a vital role in the entire microgrid. The lithium iron phosphate battery pack is applied to the microgrid with its superior performance, which can significantly improve the overall performance of the microgrid system and the utilization of various energy sources.
5.Energy storage emergency power supply vehicle
The energy storage emergency power supply vehicle is composed of lithium ion battery pack, inverter and battery management system. The inverter directly converts the battery into single-phase and three-phase AC. At ordinary times, you only need to freely select the charging period to charge the battery pack. When the battery pack is fully charged, it can be transferred temporarily for a specific task at any time within a year, and there is no floating charge forever. We can supply 100KM, 1000 KM, 5000 KM and megawatt mobile emergency energy storage vehicles, which can be used for power supply in national defense and military fields, civil disaster relief and rescue or large-scale public activities. At ordinary times, it shall be fully charged with low power, and be on standby to send power to the destination at any time.
6.Energy storage fixed power station
The energy storage fixed power station is a power station type energy storage system composed of lithium ion battery pack and BMS management system, PCS converter system, EMS energy monitoring system and auxiliary system (including temperature control, fire control, etc.) and installed in the container. Because the self-discharge of lithium ion battery is small, it does not need to operate in the floating charge state for a long time like the traditional lead-acid battery or nickel cadmium and nickel hydrogen battery. Combined with the new energy power generation system, the energy storage power station becomes a distributed power generation of independent microgrid. It is suitable for supplying reliable power supply in areas without power and power shortage. It can also supply peak shifting, valley filling, peak shaving and frequency modulation services for large power grid.
Battery energy storage power station can be combined with distributed / centralized new energy power generation, which is one of the effective ways to solve the problem of grid connection of new energy power generation. With the increasing scale of new energy power generation and the continuous development of lithium ion battery energy storage technology, it will become a major key technology to support China's clean energy development strategy.
Technical Advantages
The energy storage lithium battery pack is designed with modularity and scalability to meet different users’ power and energy requirements. The cycle life of the single battery used in the unit is up to 6000 times.
The whole energy storage system adopts perfect software protection and hardware protection function design, with high system safety and reliability, while configuring high-speed real-time upper computer control and communication network to ensure the timeliness, reliability, and stability of data transmission.
Lithium iron phosphate group battery has a long life. The cycle life is more than 2000 times, and the 3C cycle life reaches more than 800 times. Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.
1. Safe to use. Lithium iron phosphate batteries have undergone rigorous safety tests and will not explode even in violent collisions.
2. Fast charging. Using the special charger, 1.5C charging for 40 minutes can make the battery full, starting current up to 2C.
3. Lithium iron phosphate battery is resistant to high temperatures. Lithium iron phosphate battery thermal peak can reach 350 to 500 degrees Celsius, wide operating temperature range (-20 ~ +75 ℃) and high temperature (60 ℃).
4. The capacity of lithium iron phosphate batteries is large. The energy density is 3 to 4 times that of lead-acid batteries, 2.5 times that of nickel-cadmium batteries, and 1.8 times that of nickel-metal hydride batteries.
5. Lithium iron phosphate battery pack has no memory effect. No matter the battery’s state, it can be used as you go—no need to put it completely before charging.
At present, the development of the domestic lithium battery group energy storage industry is formed a good and stable expectation. In the near future, China’s lithium battery industry will develop to a higher level.
Lithium batteries are environmentally friendly because they have a high energy density, wide operating temperature range, no memory effect, fast charging and discharging, and other advantages. As the production cost decreases year by year, the technology level will continue to improve. And the share of lithium batteries in the energy storage market will increase.