The 18650 is the originator of lithium-ion battery, a standard lithium ion battery type set by Japan SONY company to save cost, of which 18 is 18mm, 65 is 65mm, and 0 is cylindrical battery.
The common 18650 batteries are divided into lithium ion batteries and lithium iron phosphate batteries. The lithium ion battery voltage is nominal voltage 3.7V, the charging cut-off voltage is 4.2V, the nominal voltage of lithium iron phosphate battery is 3.2V, the charging cut-off voltage is 3.6V, the capacity is usually 1200mAh-3350mAh, and the common capacity is 2200mAh-2600mAh.
Advantage：
Large capacity, long life, high voltage, no memory effect, small internal resistance, wide range of use
Shortcomings:
The bare core 18650 lithium battery is prone to short circuit or explosion, which is also relative to the polymer lithium battery. If the battery is relatively ordinary, this shortcoming is not so obvious.
18650 lithium battery production requires a protective line to prevent the battery from being overcharged and lead to discharge. 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, while lithium cobalt oxide lithium batteries cannot be discharged at high current, and the safety is poor.
18650, the production condition of lithium battery is very high. Compared with the general battery production, 18650 lithium battery has high requirement for production conditions, which undoubtedly increases the production cost.
18650, the advantages and disadvantages of lithium-ion battery are also exposed. How can we retain the advantages of Li ion battery and feel relieved and anxious to use it?
Don't worry, we're here!
This is the most common 18650 core, commonly known as "bare core" unfolding is a single core, without any protection measures. If the user overcharge or excessively discharges in the battery, the expensive electric core is completely discarded, and the possibility of repairing is not. It's 0. It's true that the trash can be lost directly. (use the bare core battery to be careful.)
The following is our battery - note battery part, we in the protection circuit system of each cell are fitted with a built-in part of serious. The steel shell riveting technology is used to integrate the single core into the protection circuit. It is equal to the protection program for each single core, and it is worth mentioning that in physical aspect, it effectively eliminates the risk of short circuit due to collision and impact. Is it very good? Baa heh heh heh.
This little steel hat how complicated??
Main chip
Each part photo