Common 18650 lithium battery classification and analysis of advantages and disadvantages

Common 18650 lithium batteries are divided into lithium batteries, lithium iron phosphate and nickel metal hydride batteries. The 18650 numbers in the 18650 lithium battery represent the appearance specifications: 18 refers to the battery diameter of 18.0mm, and 650 refers to the battery height of 65.0mm. Common 18650 batteries are divided into lithium batteries, lithium iron phosphate and nickel metal hydride batteries. The voltage and capacity specification is that the voltage of nickel-hydrogen battery is 1.2V, the common capacity is 2500MAH, the voltage of lithium battery is 3.6V, and the common capacity is 1500MAH-3100MAH. Lithium battery (Li-ion, LithiumIonBattery): Lithium battery has the advantages of light weight, large capacity, no memory effect, etc., so it has been widely used in many digital devices to choose lithium battery as a power source, although its price is relatively precious. The energy density of lithium battery is very high, its capacity is 1.5~2 times of the same weight of nickel-hydrogen battery, and it has a very low self-discharge rate. In addition, lithium batteries have almost no memory effect and do not contain toxic substances and other benefits are also important reasons for their widespread use. In addition, please note that the exterior of lithium batteries is generally marked with English 7.2Vlithiumionbattery (lithium battery) or 7.2Vlithiumsecondarybattery (lithium secondary battery), 7.2Vlithiumionrechargeablebattery (rechargeable lithium battery), so users must read the signs on the exterior of the battery block when buying batteries. , Beware that nickel-cadmium and nickel-hydrogen batteries are mistaken for lithium batteries because they did not see the battery type clearly. 18650 battery life theory is 1000 cycles of charging. Because the unit density has a large capacity, it is often used in notebook batteries. In addition, because the 18650 has a very good stability function in operation, it is widely used in various electronic fields: often used in high-grade glare flashlights, portable power supplies, and wireless data Transmitters, electric thermal clothing, shoes, portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments, etc. Benefits 1. The capacity of 18650 lithium batteries with large capacity is generally between 1200mah and 3100mah, while the general battery capacity is only about 800. If the 18650 lithium battery pack is combined, the 18650 lithium battery pack can break through 5000mah in a so-so. 2. Long life The 18650 lithium battery has a long service life, and the cycle life can reach more than 500 times in normal use, which is more than twice that of ordinary batteries. 3. High safety function 18650 lithium battery has high safety function, no explosion, no incineration; non-toxic, non-polluting, and RoHS trademark certification; various safety functions to strike iron while it is hot, and the number of cycles is more than 500; The electric power reaches 100%. In order to guard against the battery short-circuit phenomenon, the positive and negative electrodes of the 18650 lithium battery are separated. So the short-circuit phenomenon may have been reduced to the extreme. A maintenance board can be installed to guard against overcharge and overdischarge of the battery, which can extend the battery life. 4. High voltage The voltage of 18650 lithium batteries is generally above 3.6 and 3.7, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries. 5. There is no memory effect. It is not necessary to empty the remaining power before charging, which is convenient to use. 6. Small internal resistance: The internal resistance of polymer batteries is smaller than that of ordinary liquid batteries. The internal resistance of domestic polymer batteries can even be less than 35m, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. Time can reach the level of integration with the world. This kind of polymer lithium battery that supports large discharge current is the ideal choice for remote control models, and it has become the most promising product to replace nickel-hydrogen batteries. 7. It can be combined in series or in parallel to form 18650 lithium battery packs. 8. Wide application range: notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model airplanes, toys, camcorders, digital cameras and other electronic equipment. The biggest disadvantage of 18650 lithium batteries That is, its size is now fixed, and it is not well positioned when it is installed in some notebooks or some products. Of course, this shortcoming can also be said to be an advantage. This is a customizable and changeable size compared to other lithium batteries such as polymer lithium batteries. This is a shortcoming. And it has become an advantage location for some products with specified battery specifications. The 18650 lithium battery is prone to short-circuit and explosion, which is also related to the polymer lithium battery. Assuming a relatively ordinary battery, this shortcoming is not so clear. 18650 lithium battery production must have a maintenance circuit to guard against overcharge and overdischarge of the battery. Of course, this is necessary for lithium batteries. This is also a common disadvantage of lithium batteries, because the materials used for lithium batteries are basically lithium cobalt oxide materials, and lithium cobalt oxide materials cannot be discharged with high current and are safe. Poor sex. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.