Four commonly used batteries for solar street lights
Solar battery is an important component of solar street lamp. At present, Lead–acid battery, gel battery, ternary lithium ion battery and Lithium iron phosphate ion battery are used. Which is the best of several common solar street lamp batteries? Shinetoo will introduce in detail the four commonly used batteries for solar street lights.
Lithium iron phosphate ion batteries commonly used in solar street lights:
The Lithium iron phosphate battery is a kind of lithium ion battery that uses Lithium iron phosphate as the cathode material and carbon as the cathode material. The rated voltage of the single battery is 3.2V, and the charging cut-off voltage is 3.6V~3.65V. In the charging process, some lithium ions in Lithium iron phosphate are removed, transferred to the negative electrode through the electrolyte, and embedded in the carbon material of the negative electrode; At the same time, electrons are released from the positive electrode and reach the negative electrode from the external circuit, maintaining the balance of chemical reactions. During the discharge process, lithium ions detach from the negative electrode and reach the positive electrode through the electrolyte. At the same time, the negative electrode releases electrons, which reach the positive electrode from the external circuit and provide energy to the outside world.
Lithium iron phosphate ion battery is a battery that combines many advantages. It has high specific capacity, small size, fast charging, durability and good stability, but its price is also the highest among all batteries. Its deep cycle charging times are generally 1500-2000. A group of Lithium iron phosphate ion batteries can be used for 8-10 years under normal use, and can be used at -40 ℃ -70 ℃. The temperature range of use is relatively wide.
Colloidal batteries commonly used in solar street lights:
Colloid battery is a kind of development classification of Lead–acid battery. The method is to add gelling agent in sulfuric acid to change the sulfuric acid electrolyte into colloidal state. Batteries with colloidal electrolyte are generally referred to as colloidal batteries. The difference between colloidal batteries and conventional lead-acid batteries has evolved from the initial understanding of electrolyte gelation to the study of electrochemical characteristics of electrolyte basic structures.
This is equivalent to the upgraded version of Lead–acid battery, which is maintenance free, overcoming the frequent criticism of Lead–acid battery maintenance. The internal structure replaces sulfuric acid electrolyte with colloidal electrolyte, and it also significantly improves the storage capacity, discharge capacity, safety performance and life, but sometimes exceeds the price of ternary lithium-ion battery. Colloidal batteries can be used in the temperature range of -40 ℃ to -65 ℃, with good low-temperature performance, and can be used in high and cold areas in the north. Good seismic resistance and safe use under various harsh conditions. Its service life is twice or even more than that of ordinary Lead–acid battery.
Commonly used ternary lithium-ion batteries for solar street lights:
A ternary polymer lithium battery refers to a lithium battery that uses lithium nickel cobalt manganese oxide (Li (NiCoMn) O2) or lithium nickel cobalt aluminate as the positive electrode material. The positive electrode material of a ternary composite battery is mainly composed of nickel salts, cobalt salts, and manganese salts, and the ratio of nickel cobalt manganese can be adjusted according to actual needs. Batteries with ternary materials as the positive electrode have higher safety compared to lithium cobalt oxide batteries.
There are many advantages of ternary lithium-ion batteries, such as high specific energy, small size, fast charging, and high price. It has a deep cycle count of about 500 to 800 times, and its lifespan is similar to that of a colloidal battery. The temperature range used is between -15 ℃ and 45 ℃. But ternary lithium-ion batteries also have drawbacks, as their internal stability is not very stable. If they are produced by unqualified manufacturers, they may explode during overcharging or in high temperature environments.
Lead–acid battery commonly used for solar street lights:
The electrode plate of Lead–acid battery is composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. The important advantages of Lead–acid battery are relatively stable voltage and low price; The disadvantage is that the specific energy is relatively low, so the volume is much larger than that of ordinary batteries. The service life of Lead–acid battery is relatively short, generally 300-500 deep cycles, and maintenance is relatively frequent. However, due to the price advantage, they are still widely used in the solar street lamp industry.
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