With the increasing maturity of new energy technologies, the country vigorously pursues energy conservation and emission reduction, the application of solar street light system is becoming more and more widespread, then as the core of its system of an accessory, there are 4 types of solar street light batteries on the market include: lead-acid batteries, colloidal batteries, ternary lithium-ion batteries and lithium iron phosphate batteries.
1. Solar street light lead-acid battery
Lead-acid batteries are composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. The important advantages of lead-acid batteries are relatively stable voltage, cheaper price and high security; the disadvantage is that the service life of lead-acid batteries is relatively short, the volume is much larger than ordinary batteries, but because of its price advantage, it is still dominant in the use of solar street lamp industry.
2. solar street light colloidal battery
It is equivalent to an upgraded version of lead-acid batteries, maintenance-free and less maintenance, and importantly, it replaces the sulfuric acid electrolyte with a colloidal electrolyte internally, which improves the storage capacity, discharge capacity, safety performance and life expectancy.
Gel batteries can be used within the temperature range of -40℃~60℃, with better low temperature performance, and are the best choice in the northern alpine region or tropical areas where the temperature is higher; their anti-vibration performance is also very good, and can be used safely under a variety of harsh conditions, and their service life is double or even more than that of ordinary lead-acid batteries.
3. Solar street light ternary lithium ion battery
High specific energy, small size, fast charging, high price, its deep cycle times of 500 to 800 times, life and gel batteries are almost the same, the temperature range of use is -15 ℃ ~ 45 ℃. But ternary lithium-ion batteries also have disadvantages, poor safety, if the battery is not very stable inside, or unqualified manufacturers of ternary lithium, it is very likely to explode in the process of overcharging or higher temperatures.
4. solar street light lithium iron phosphate ion battery
High specific energy, small size, fast charging, good stability, temperature range is also wide, but the price is the highest of all the batteries, due to cost issues have not been large-scale implementation of the use.
Most solar street light systems currently use lead-acid batteries and colloidal batteries, some use lithium batteries, then how to maintain it in the course of use?
①Prevention of overfilling
Solar street lamp battery life depends on external maintenance, but also with the internal heat accumulation is closely related to the solar battery if overcharged, it will make the battery internal temperature rise step by step, the phenomenon of thermal runaway.
Prevention of insufficient voltage
In addition to preventing over-charging, solar cells should also prevent under-charging, always under-charging then may also be a problem with the racking system, or the voltage is too low to cause, often under-charging will lead to a reduction in the number of cycles, which will also shorten the life of the battery.
(3) Prevent over discharge
The discharge depth of the battery is closely related to the designed charge/discharge cycles (service life) of the battery.
④ Control the ambient temperature
Especially high temperature environment will shorten the life of solar battery by half, the life of the battery is longer in normal weather, but in high temperature, the battery will suffer; if it is used in extreme low temperature or high temperature environment, it is recommended to use the gel battery with a wide range of temperature application.
The lithium solar street light battery includes lithium solar battery cells, battery special material, the ease of design, time consuming costs, assembly costs, solar street lamp battery pack transportation costs for the overall tax quotes, with special requirements of the lithium solar street light prices are higher.