When purchasing solar street lights, manufacturers ofte […]
When purchasing solar street lights, manufacturers often ask customers to provide some information to determine the rationality of the components of solar street lights, such as the number of rainy days common in the installation area, which is generally used to determine the capacity of the battery. In terms of choice, the lead-acid batteries in the past have gradually been replaced by lithium iron phosphate batteries. It is said that lithium iron phosphate batteries are better. So what are the advantages of this battery and where are the advantages?
1. Improved safety performance
Batteries often fail due to overcharge and overdischarge. It is still a small matter to affect its performance. With these failures, there is often a potential explosion hazard. For example, the structure of lithium cobalt oxide batteries is not stable enough, at high temperatures or overcharge. It is easy to collapse and generate heat, or form strong oxidizing substances, which affects its safety.
In the crystal structure of lithium iron phosphate batteries, the PO bond is very stable and difficult to decompose. Of course, it cannot be said that there is no danger at all. If it is used improperly, it may still be dangerous, but compared with other batteries, its safety is already much greater. Improved, with some safety protection devices, it will be more assured to use.
2. Life extension
During the discharge process, the discharge voltage of the lithium iron phosphate battery is stable and basically remains unchanged. Only when the discharge voltage is almost reached, it will change a little, showing good discharge characteristics, and the cycle life can reach more than 2000 times. It can be used 7 to 8 years, and the cycle life of lead-acid batteries is often 300 to 500 times, and it will lose its characteristics after a short period of time, and it will take about one and a half years at most.
3. Stable capacity
If the battery is left in an environment that is fully charged and not discharged for a long time, it will have a great impact on the capacity, because there is a memory effect. For batteries such as Ni-MH and Ni-Cr, this situation is irreversible. The battery capacity is small, it is really small. The lithium iron phosphate battery is over-discharged and stored at zero voltage, and there will be no leakage or damage, and the capacity does not change much. When you want to use it, do a few charge-discharge cycles and the capacity can be restored. This is other Some lithium-ion batteries do not have characteristics.
4. Light weight
This involves a specific energy issue. Compared with lead-acid batteries, under the same conditions, the volume of lithium iron phosphate batteries is only about 60%~70%, while the weight of lead-acid batteries only has 30%~40% of its effect. , It can save space better, and it also proves to a certain extent from another level that under the same conditions, the capacity of lithium iron phosphate batteries is a little larger.
5. Environmental protection
This is mainly related to the disposal of batteries after they are discarded. Lead-acid batteries contain a large amount of heavy metals such as lead. If they are not handled properly, they will easily pollute the environment. However, lithium iron phosphate batteries do not contain harmful substances and have good performance. It is relatively stable, no matter it is in use or in the post-disposal process, it will not cause any environmental pollution.