1, Solar street lights commonly used lithium iron phosphate batteries:
What is lithium iron phosphate ion battery?
Lithium iron phosphate battery, is a lithium-ion battery using lithium iron phosphate (LiFePO4) as the battery cathode material, carbon as the negative electrode material, monomer rated voltage of 3.2V, charging cut-off voltage of 3.6V ~ 3.65V. charging link, part of the lithium ions in lithium iron phosphate off, passed through the electrolyte to the negative electrode, embedded in the negative electrode carbon material; while the release of electrons from the positive electrode, since The external circuit reaches the negative electrode to maintain the balance of the chemical reaction. Discharge link, lithium ions from the negative electrode off, through the electrolyte to the positive electrode, while the negative electrode to release electrons, from the external circuit to the positive electrode, to provide energy to the outside world.
Lithium iron phosphate ion battery it combines many advantages into one battery, it is higher than the energy, small size, fast charging, rugged, good stability, but the price is also the highest of all batteries. It deep cycle charging times are generally in the 1500-2000 times, a set of lithium iron phosphate batteries in normal use, generally can be used for 8-10 years, can be used in the -40 ℃ -70 ℃ environment, the use of the temperature range is still relatively wide.
2, Colloidal cells commonly used in solar street lights:
What is a colloidal battery?
Colloidal battery is a development classification belonging to the lead-acid battery, the method is to add gelling agent in sulfuric acid, so that the sulfuric acid electrolyte is converted into a colloidal state. The battery whose electrolyte is in colloidal state is generally called colloidal battery. The difference between colloidal battery and conventional lead-acid battery is that from the initial understanding of electrolyte gelling, it is further developed to the study of electrochemical properties of electrolyte base structure.
It is a maintenance-free battery, which overcomes the criticism of frequent maintenance of lead-acid batteries. The internal structure replaces the sulfuric acid electrolyte with colloidal electrolyte, and significantly improves the power storage, discharge capacity, safety performance and life time, but sometimes even surpasses the ternary lithium-ion battery in terms of price. The colloidal battery can be used in the temperature range of -40℃65℃, and the low temperature performance is better, so it can be used in the northern alpine region. Good shock resistance, can be used safely under various harsh conditions. The service life is double or even more than that of ordinary lead-acid batteries.
3, NMC lithium-ion batteries commonly used in solar street lights:
NMC lithium-ion battery has many advantages, it has high specific energy, small size and fast charging. Its deep cycle times are about 500-800 times, and the life span is about the same as that of colloidal batteries, and the temperature range is -15℃-45℃. But the ternary lithium-ion battery also has disadvantages, it is less stable inside the battery, if the ternary lithium-ion battery produced by unqualified manufacturers, it is possible that in the process of overcharging or higher temperature environment, there is a possibility of explosion.
4, The lead-acid battery commonly used in solar street lights:
The pole plate of lead-acid battery is composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. The important advantage of lead-acid batteries is that the voltage is relatively stable and relatively cheap; the disadvantage is that the specific energy is relatively low, so the volume is much larger than ordinary batteries, the service life of lead-acid batteries is relatively short, generally 300-500 deep cycle, maintenance is more frequent, but because of the price advantage, in the solar street light industry is still used in large numbers.