Which battery cell is better for lithium-ion battery packs?

The batteries for assembling lithium-ion battery packs are mainly 18650 batteries and lithium-ion polymer batteries, and lithium iron phosphate square batteries. These three are also common materials for lithium-ion battery packs. 2500mAH 18650 power 3C battery 18650 battery 18650 battery cathode material in the market is generally lithium iron phosphate ion and lithium manganate ion and ternary. Lithium manganate ion Lithium manganate ion is a battery cell material with a long history of use in lithium-ion battery cells. Its safety is relatively high, especially its ability to resist overcharge. In addition, its material prices are relatively cheap, and the processing technology requirements are relatively low. But it also has obvious shortcomings, the high temperature performance of lithium manganate ion is not good. The advantages of lithium iron phosphate lithium iron phosphate are its safety and service life. The disadvantages are also obvious. The life of a single battery of lithium iron phosphate battery is long, about 2000 times, but the life of the battery pack is short, generally Around 500 times, and the low temperature performance is not good. Ternary Lithium Ion Ternary Lithium Ion Cathode Material has the advantage of forming a synergistic effect inside the same cell, and it has the three requirements of stability, activity and low cost of the material structure. The disadvantage of ternary materials mentioned more is safety. In the process of thermal runaway, the things that appear in it contain a lot of toxic gases, which is more dangerous. The 18650 battery is cylindrical and generally packaged in a steel shell. Because the lithium of 18650 is in a liquid state, just like a cup is filled with water, 18650 can only be cylindrical. The danger of 18650 is still high, because the packaging of 18650 is generally made of steel shell with PVC film on the shell. The entire outer body of the steel shell is the negative electrode. If the outer film is damaged, it is easy to cause a short circuit. Now 18650 batteries have safety valves (for example, 18650 batteries do not even have safety valves, you must not choose this kind of batteries without safety valves) when the temperature rises, the safety valve will open to discharge the heat in the battery. Discharge of heat is very easy to cause fire, so when choosing a battery cell, you must be optimistic about whether the outer membrane is intact. In addition, the processing technology of some battery cell manufacturers is not up to standard, and the battery life and safety are greatly reduced. Therefore, when choosing a battery cell, you must see whether the manufacturer has specifications, safety certification certificates and various test reports. Lithium-ion polymer batteries Lithium-ion polymer batteries are generally made from a mixture of lithium cobaltate, lithium manganate, and ternary lithium ions. Through a certain proportion of the mixture of the three, it is produced by a certain process. The outer packaging is mainly made of aluminum-plastic film, and the lithium ion substance in the middle is paste. The shape can be customized arbitrarily. The biggest safety problem of lithium-ion polymer batteries is leakage and short-circuit causing bulging problems. In severe cases, it will cause burning and flames. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Why can't the telecommunication lithium iron phosphate battery be used on a large scale