u003cpu003eAbstract: High-performance energy storage batteries are vital to the development of the photovoltaic industry. 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 of use. Using this type of lithium battery pack
as an energy storage device can increase the energy efficiency to about 90%, so it is very suitable for use as a new energy storage device. The lead-acid battery and the lithium iron phosphate battery were compared in terms of conventional performance and energy storage characteristics. Based on the analysis of the feasibility of using lithium iron phosphate batteries as energy storage devices for photovoltaic systems, a corresponding photovoltaic power storage system was designed. u003c/pu003eu003cpu003eKeywords: lithium iron phosphate battery; photovoltaic power generation; storage efficiencyu003c/pu003eu003cpu003eChinese Library Classification Number: TM 615 Document Identification Code: A Article Number: 1002-087 X(2014)08 -1487-02u003c/pu003eu003cpu003eu003c/pu003eu003cpu003eu003cpu003e Among many renewable energy sources, solar energy has become the most environmentally friendly, environmentally friendly, inexhaustible, and inexhaustible. Energy forms with development potential have huge market prospects. my country has very rich solar energy resources, and the development of the photovoltaic industry is of great significance to the improvement of electricity consumption in my country's underdeveloped and remote areas. However, photovoltaic power generation has discontinuity and instability, and the power generation performance changes with changes in the external environment. Therefore, high-performance power storage links are vital to the development of the photovoltaic industry. u003c/pu003eu003cpu003e Currently, most photovoltaic systems use lead-acid batteries as energy storage devices. 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 of use. This article compares lead-acid batteries with lithium iron phosphate batteries in terms of conventional performance and energy storage characteristics. Based on the analysis of the feasibility of using lithium iron phosphate batteries as energy storage devices for photovoltaic systems, a corresponding photovoltaic power storage system was designed. u003c/pu003e1 The basic requirements of solar photovoltaic power generation systems for energy storage linksu003cpu003e Solar power generation systems have high cost, low conversion efficiency, and strong variability with the environment, so the requirements for energy storage links are higher. The service life of a solar photovoltaic power generation system is generally 20 years, and the energy storage link required with it has the characteristics of long service life, stable performance, high energy efficiency, and strong adaptability to the environment. u003c/pu003eu003cpu003eCurrently, energy storage technologies used in photovoltaic power generation systems are mainly divided into electrochemical cells, flywheels, and superconducting coils. In comparison, flywheel energy storage and superconducting energy storage have incomparable advantages in performance of chemical batteries, and will definitely become an inevitable trend in the development of energy storage devices. However, at this stage, due to technology and price reasons, chemical batteries It is still the main method of solar photovoltaic power generation and energy storage. u003c/pu003eu003cpu003e Using chemical cells as the energy storage link of photovoltaic power sources is to directly convert the energy released by redox in chemical reactions into direct current electrical energy for load use. Currently, there are mainly six electrochemical media that can be used as solar energy storage units, as shown in Table 1 . u003c/pu003eu003cpu003eTable 1 Comparison of various battery performancesu003c/pu003eu003cpu003eEvaluation of electrochemical medium cell voltage/V Lead acid 2.0 Lowest cost Nickel cadmium 1.2 Has memory effect Metallic nickel cyanide 1.2 is temperature-sensitive lithium ion 3.6 Safe and non-metallic lithium-lithium polymer 3.0 Metallic lithium-zinc-air 1.2 requires good air management to limit the self-discharge rateu003c/pu003eu003cpu003e Among the above 6 types of batteries, the energy density of lead-acid batteries Low, but its technological maturity and cost-effectiveness are the highest. Therefore, the current energy storage unit of photovoltaic power generation systems mainly uses valve-regulated sealed lead-acid battery packs. However, with the further development of photovoltaic power generation, higher requirements are put forward on the performance and safety of the battery, and the disadvantages of the weakness of the lead-acid battery's own performance on photovoltaic power generation have become increasingly prominent. Therefore, there is an urgent need for a high-efficiency chemical battery to act as the corresponding energy storage link. u003c/pu003eu003cpu003e2 Performance analysis of lithium iron phosphate batteryu003cpu003e Lithium iron phosphate battery is a new type of secondary power supply developed in recent years, with large input and output power, wide operating temperature range, no memory effect, and maintenance-free , With 2000 cycles of charging and discharging service life, safety, and environmental protection, it is becoming the protagonist of chemical batteries . u003c/pu003eu003cpu003eThe main material of lithium iron phosphate battery is carbon, the main material of the positive electrode is lithium iron phosphate LiFePO4, the electrolyte uses LiPF6 organic solvent, the basic principle of charge and discharge is the insertion of lithium ions between the positive and negative electrodes And prolapse. u003c/pu003eu003cpu003eThe voltage platform of lithium iron phosphate battery is 3.2V, the specific energy is more than twice that of lead-acid batteries, and the volume specific energy is 4 to 5 times that of lead-acid batteries. If you use lithium iron phosphate batteries instead Lead-acid batteries are used in photovoltaic power generation systems, which can greatly reduce the space occupied by the battery and reduce the maintenance workload. The conventional performance of the two batteries is shown in Table 2. u003c/pu003eu003cpu003eFigure 2 Lithium iron phosphate battery and lead-acid battery conventional performance tableu003c/pu003eu003cpu003eProject Lithium iron phosphate battery lead-acid battery nominal voltage/V3.22.0 mass specific energy/(Wh·kg -1) 9040 volume ratio energy/(Wh·L-1) 19070 self-discharge (28 days)/%≤10≤10 working temperature range/℃-20～55-10～45 best working temperature range/℃5～ 50～25u003c/pu003eu003cpu003eu003cpu003e Lithium iron phosphate battery can choose power type or energy type. It has a wide range of applications and its safety is greatly improved compared with lead-acid batteries. At the same time, the rate characteristics of lithium iron phosphate batteries are 5 C to 15 C, and the conversion efficiency is greater than 95%, while the rate characteristics of lead-acid batteries are 0.1 C to 1 C, and the conversion efficiency is greater than 80%. Therefore, in terms of energy storage efficiency, lithium iron phosphate batteries have obvious advantages. u003c/pu003eu003cpu003e3 Development and design of lithium iron phosphate battery energy storage systemu003cpu003e
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