Can lithium iron phosphate batteries be used for photovoltaic energy storage
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2022/05/28 15:38:56
Langkelway Electronic Technology
Langkelway Electronic Technology
Lv.2
Can lithium iron phosphate batteries be used for photovoltaic energy storage? Photovoltaic power generation has discontinuity and instability, and the power generation performance changes with the change of the external environment. Therefore, the high performance energy storage lithium iron phosphate battery is crucial to the development of photovoltaic industry. At present, most photovoltaic systems use lead-acid batteries as energy storage devices, lithium batteries can improve energy efficiency to about 90%, so it is very suitable for new energy storage devices.
Can lithium iron phosphate batteries be used for photovoltaic energy storage?
Lithium iron phosphate batteries can be used for photovoltaic energy storage power generation. Solar power generation system has high cost, low conversion efficiency and strong change with the environment, so it has high requirements for energy storage link. The service life of solar photovoltaic power generation system is generally 20 years, which requires the supporting energy storage battery link with long service life, stable performance, high energy efficiency, strong ability to adapt to the environment and other characteristics.
Compared with lead-acid batteries, lithium iron phosphate batteries have the advantages of high specific energy, high energy storage efficiency, long cycle life and low cost. Lithium iron phosphate battery is a new type of secondary power supply developed in recent years. It has the characteristics of large input and output power, wide operating temperature range, no memory effect, maintenance-free, 2000 charge and discharge life, safety and environmental protection, and is becoming the protagonist of chemical batteries.
The voltage platform of lithium iron phosphate battery is 3.2V, and the specific energy is more than 2 times that of lead acid battery, and the volume specific energy is 4 to 5 times that of lead acid battery. If lithium iron phosphate battery is used in photovoltaic power generation system instead of lead acid battery, it can greatly reduce the space occupied by the battery and reduce the maintenance workload.
Lithium iron phosphate battery can choose power type or energy type, applicable to a wide range of safety than lead-acid battery has a great improvement. At the same time, the rate characteristic of lithium iron phosphate battery is 5C ~ 15C, and the conversion efficiency is greater than 95%, while the rate characteristic of lead acid battery is 0.1c, and the conversion efficiency is greater than 80%. Therefore, lithium iron phosphate batteries have obvious advantages in energy storage efficiency.
Lithium battery pack plays two roles in the system, one is energy storage and regulation, the other is load balance, it will photovoltaic power generation system output into chemical energy storage, in case of insufficient power supply for use.
The rapid development of solar photovoltaic power generation system has put forward higher requirements for energy storage system. The characteristics of lithium iron phosphate battery, such as high energy storage efficiency, long life, good charge-discharge performance, determine that it is very suitable for new energy storage power supply, stable and reliable operation, and good application prospect.
What is photovoltaic energy storage technology?
The application purpose of energy storage power station (system) in power grid mainly considers several functional applications such as "load regulation, new energy access, line loss compensation, power compensation, power quality improvement, isolated network operation, peak load cutting and valley filling". For example, peak cutting and valley filling can improve the operation curve of the power grid. In a simple way, the energy storage station is like a reservoir, which can store the surplus water in the off-peak period of power consumption and use it again in the peak period of power consumption, thus reducing the waste of electric energy. In addition, the energy storage power station can reduce line loss and increase the service life of lines and equipment.
What are the requirements for photovoltaic energy storage lithium battery selection?
As an energy storage power station with photovoltaic power generation access to achieve peak load filling, load compensation and improve power quality, energy storage lithium is a very important component, which must meet the following requirements:
Easy to realize multi-way combination, meet the higher working voltage and large working current;
(2) The capacity and performance of lithium iron phosphate battery can be detected and diagnosed, so that the control system can realize the scheduling control of power station load in the case of the battery capacity and performance can be predicted;
(3) High safety and reliability: in normal use, the normal service life of the battery is not less than 15 years; In the extreme case, even if the fault occurs, it is in the controlled scope, and there should be no explosion, combustion and other faults that threaten the safe operation of the power station.
(4) with good rapid response and large rate of charge and discharge capacity, generally requires 5-10 times of charge and discharge capacity;
⑤ Higher charge-discharge conversion efficiency, easy to install and maintain, with better environmental adaptability, a wide range of operating temperature.
Lithium iron phosphate battery is used in photovoltaic power generation system for energy storage, the effect is good, as a large capacity battery energy storage system technical analysis, lithium iron phosphate battery is the first choice.
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