18650 is the originator of lithium-ion battery–a standard lithium-ion battery model that Japan SONY Company set in order to save cost, 18 of which means diameter is 18mm, 65 means length is 65mm, 0 means cylindrical battery.
Advantages:1, the capacity of large 18650 lithium battery capacity is generally between 1200mah ~ 3600mah, and the general battery capacity is only about 800mah, if combined into a 18650 lithium battery pack, then 18650 lithium battery pack can easily break through 5000mah.2, 18650 lithium battery has a long service life, the normal life cycle can reach more than 500 times, more than twice the average battery.3, high safety performance 18650 lithium battery safety performance, no explosion, no burning; non-toxic, non-polluting, after RoHS trademark certification; all kinds of safety performance in one go, cycle times greater than 500 times; high temperature performance, 65 degrees The discharge efficiency is up to 100%. In order to prevent battery short circuit, the positive and negative poles of the 18650 lithium battery are separated. So the possibility of its short circuit has been reduced to the extreme. A protective plate can be added to prevent the battery from overcharging and over-discharging, which also extends the battery life.4. The voltage of the 18650 lithium battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of NiCd and NiMH batteries.5, no memory effect does not have to empty the remaining power before charging, easy to use.6. The internal resistance is small: the internal resistance of the polymer battery is smaller than that of the general liquid battery. The internal resistance of the domestic polymer battery can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby of the mobile phone. Time can fully reach the level of international standards. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.7. It can be combined in series or in parallel to form a 18650 lithium battery pack.8, the use of a wide range of notebook computers, walkie-talkies, portable DVD, instrumentation, audio equipment, aircraft models, toys, cameras, digital cameras and other electronic equipment.
Disadvantages:1, the biggest disadvantage of 18650 lithium battery is that his volume has been fixed, it is not very well positioned when installed in some notebooks or some products, of course, this shortcoming can also be said to be an advantage, which is relative to other polymer lithium batteries, etc. This is a disadvantage in terms of the customizable and convertible size of lithium batteries. It is an advantage over some products with specified battery specifications.2, 18650 lithium battery is prone to short circuit or explosion, it is also relative to the polymer lithium battery, if compared with the average battery, this shortcoming is not so obvious.3, 18650 lithium battery production needs to have a protection circuit to prevent the battery from being overcharged and causing discharge. which is also a disadvantage of lithium batteries, because the materials used in lithium batteries are basically lithium cobalt oxide materials, and lithium batteries of lithium cobalt oxide materials can not discharge at high current, safety Poor.4, 18650 lithium battery production requirements are high, compared to the general battery production, 18650 lithium battery requirements for production conditions, which undoubtedly increased production costs.
