Detailed explanation of the working principle and application scenarios of lithium-ion battery energy storage power stations
The working principle of emergency lithium-ion energy storage vehicle or megawatt-class fixed energy storage power station is to directly convert the high-power lithium-ion battery pack into single-phase or three-phase AC power through the inverter. Normally, you only need to freely choose the charging period to charge the battery pack, and when the lithium-ion battery pack is fully charged, it can be called at any time. Energy storage battery is the indispensable storage energy components of solar photovoltaic power generation system, its important function is to store the electrical energy of photovoltaic power generation system, and in the amount of sunshine is not enough, night and emergency state for load power supply.
Emergency lithium storage vehicles or megawatt-class fixed energy storage power station are set with slow and fast charging jacks. The fast and slow charging method is to control the length of charging time by selecting different charging currents. The whole charging process is monitored by an intelligent management system. When the voltage of any single lithium-ion battery reaches the set value, the charger will automatically terminate the charging of the battery pack.
Emergency energy storage vehicles or megawatt-class fixed energy storage power plants are specially designed with output interfaces, (generally two types of high-power three-phase output interfaces and conventional single-phase output jacks are designed according to user requirements).
Usually just check the indicators of each single battery on the display of the lithium-ion battery management system, no manual maintenance is required. The battery management system has knowable capacity display, voltage display, the temperature of each single battery and its minimum or maximum voltage display.
Lithium-ion battery energy storage power plant application scenario
Energy storage lithium-ion battery as an emerging application scenario is also gradually gaining attention, energy storage is one of the important means to solve the intermittent volatility of new energy wind power, photovoltaic, to achieve the function of “peak shaving”. China’s lithium-ion energy storage in the practical application of power storage, renewable energy to the grid, user side, grid side and auxiliary services are the four most important areas.
1、Energy storage emergency power vehicle
Energy storage emergency power vehicle consists of lithium-ion battery pack, inverter, battery management system, etc. The inverter will directly convert the battery into single-phase and three-phase AC power. Normally, you only need to freely choose the charging time to charge the battery pack. When the battery pack is fully charged, it can be called at any time within one year and never needs to be floating charged. We can supply 100KW, 1000KW, 5000KW, megawatt level mobile emergency energy storage vehicle, this kind of emergency energy storage vehicle can be used in the field of national defense and military, civilian disaster relief and rescue or large public activities to supply power. Usually fully charged with low valley electricity, ready to standby to drive to the destination to deliver power.
2、Energy storage fixed power station
Energy storage fixed power station consists of lithium-ion battery pack and BMS management system, PCS variable current system, EMS energy monitoring system, auxiliary systems (including temperature control, fire control, etc.), and installed in the container power station type energy storage system. Because of the small self-discharge of lithium-ion batteries, they do not need to be kept in floating charge for a long time like traditional lead-acid batteries or NiCd or NiMH batteries. The energy storage power station combined with new energy generation system becomes a distributed power source for independent microgrid. It is suitable for supplying reliable power in areas without electricity and power shortage, and can also supply peak-shifting and peak-frequency regulating services for large power grids.
Battery storage power station can be used in combination with distributed/centralized new energy generation, which is one of the effective ways to solve the problem of grid connection of new energy generation, and will become a major key technology to support China’s clean energy development strategy with the increasing scale of new energy generation and the continuous development of lithium-ion battery storage technology.
3、Communication backup power
Communication backup power market consists of two important parts, part of the new base station energy storage constitutes the annual market increment; part of the stock of base station battery expiration replacement constitutes the annual market base volume. China’s towers announced that from this year no longer purchase lead-acid, considering the scale of ladder battery is not enough to meet, so around 2020 there will be a wave of lithium procurement replacement demand concentration. Together with the new 50,000-100,000 base stations per year, will bring 1.2-2.4GWh of lithium demand, the total will have about 10GWh of battery demand per year, satisfied by lithium iron ion batteries and ladder batteries.
Summary: Lithium-ion battery energy storage technology has the advantages of high efficiency, application flexibility, and fast response time gradually occupy an increasingly important position in the power storage market. Lithium-ion batteries can be applied to power quality, reliability control, backup power, peak shaving, energy management, renewable energy storage, etc.