What are the advantages of solar street lamp energy storage lithium iron phosphate batteries?

Solar street lamp power generation system has high cost, low conversion efficiency, and strong variability with the environment, so it has high requirements for energy storage. The service life of a solar photovoltaic power generation system is generally 20 years. The lithium iron phosphate battery for energy storage is required to have the characteristics of long service life, stable performance, high energy efficiency, and strong adaptability to the environment. 1.Lightweight and small size The total weight and volume of the energy storage lithium iron phosphate battery are 1/3 of the lead-acid battery of the same specification, and it can be easily carried by the elderly, women, or children. 2.Low-temperature resistance Ordinary lead-acid batteries have less than 50% power when the temperature is below 0°C. Li-ion batteries can still release more than 90% of the power at -20°C, and can still release more than 80% of the power at -40°C. 3.Long lifespan Energy storage lithium iron phosphate batteries have been charged and discharged more than 300 times in practical applications, and their capacity is not less than 80% of the original capacity, while lead-acid batteries have only 60% remaining capacity after being charged and discharged 200 times. 4.Environmental The energy storage lithium iron phosphate battery has no leakage, no pollution, no heavy metals such as cadmium, mercury, lead, etc. It solves the pollution problem in the whole process of production and use and is a globally recognized green energy source. Application of energy storage lithium iron phosphate battery in solar street lights 1）Charging efficiency The charging efficiency of energy storage lithium iron phosphate batteries can reach 100%, while the charging efficiency of lead-acid batteries is only 60%. If a 100W solar panel is present, according to the weather conditions in Shanxi Province, lithium iron phosphate batteries can store approximately 45W-75W per day, while lead-acid batteries can only store 27W-45W. Only 2 lead-acid batteries can achieve the charging effect of 1 lithium iron phosphate battery. In other words, the same capacity battery, lithium iron phosphate battery can supply a 60W lamp, while the lead-acid battery can only supply a 30W lamp. 2）Excellent discharge performance The discharge voltage of the lithium iron phosphate battery is stable, and it can discharge 100% at room temperature. The discharge depth of lead-acid batteries is at most 60-70%. The charging performance of lead-acid batteries is approximately half that of lithium iron phosphate batteries, and discharge can only release half of lithium iron phosphate batteries. In practical applications, the same 12V40AH battery, the lithium iron phosphate battery can discharge 40AH electric energy, if the street lamp works for 10 hours every night, it can work continuously for 2 cloudy and rainy days; if the charging performance is only half of the state, charging for 1 day, lead The acid battery receives 20 AH, but can only release 10 AH of electric energy, which can only supply half a rainy day for continuous operation. If lead-acid batteries are frequently discharged deeply, the cycle life will be greatly shortened. It is often under-charged and cannot be recharged in time. The generated sulfate particles are large, and the active material of the electrode plate cannot be fully utilized. As this goes on, the actual capacity of the battery will gradually decrease. The charging and discharging state of the lithium iron phosphate battery is reversible, there is no memory effect, and it can be discharged with 100% DOD. 3）Small size and lightweight The volume ratio of lithium-ion batteries is as high as 100wh/l, which is smaller than lead-acid batteries. Freer from space constraints in installation. The weight of a lithium iron phosphate battery with the same capacity is only half the weight of a lead-acid battery. For example, the size specification of lithium iron phosphate battery 12V110AH is 260*158*244, weight: 15kg; while the size specification of lead-acid battery 12V100AH: length*width*height*total height: 407*173*210* 236(mm), weight: 32.7kg. It can be clearly seen that the lithium iron phosphate battery is smaller in size and weighs less than half. 4. Long service life and low maintenance cost After 2000 cycles, the lithium iron phosphate battery still maintains its capacity above 80% of the nominal capacity and can be used for 7-8 years under basic conditions, while the lead-acid battery needs to be replaced in half a year to 1 year. During the charging and discharging process of the lithium iron phosphate battery, the positive lithium iron phosphate and the negative electrode graphite undergo opposite volume changes, the total volume of the battery remains unchanged, and the pressure on the diaphragm is less, which has greater protection for battery safety and cycle life. During storage, lead-acid batteries must be recharged for 3 months, otherwise, they will be scrapped; while lithium iron phosphate batteries have good storage performance and can be stored for up to 3 years, without the need for recharge and maintenance. The labor cost is greatly reduced, and there is no pollution. The lithium iron phosphate battery has excellent storage performance, with a monthly self-discharge rate of about 2% and a capacity recovery rate of over 98%. 5）Best match with the charge and discharge state of street lights The charging and discharging currents of street lamps are very small, most of them do not exceed 10A, so for batteries, they are shallow charge and shallow discharge. This way of working limits the matching battery. For example, Ni-MH batteries must be fully discharged and recharged, otherwise, their life will be affected. For lithium iron phosphate batteries, there is no memory effect, but it will extend the service life. The rapid development of solar photovoltaic power generation systems puts forward higher requirements for energy storage systems. The characteristics of energy storage lithium iron phosphate batteries such as high energy storage efficiency, long life, and good charge and discharge performance determine that they are very suitable for new energy storage. With the power supply, the operation is stable and reliable, and the application prospect is good.