What Is 18650 Cell?

1. The number 18650 in the 18650 cell represents the external size: 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical cell. The common 18650 cells are divided into lithium-ion cells, lithium iron phosphate and nickel-metal hydride cells.

 

2. 18650 cell characteristics

1)  large capacity

The capacity of 18650 lithium cell is between 1200mah~3600mah, if the 18650 cell is combined into a lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

 

2)  long life

The service life of the 18650 lithium cell is very long, and the cycle life is more than 500 times in normal use, which is more than twice of the ordinary cell.

 

3) high safety performance

18650 lithium cell has high safety performance, no explosion, no combustion; Non-toxic, pollution-free, with CE and RoHS certification and various safety performance tests, more than 500 cycles; Good high temperature resistance. In order to prevent short circuit of the battery, the positive and negative poles of the 18650 lithium cell are separated. So the possibility of a short circuit has been reduced to the extreme. You can install a protection plate to avoid overcharging and over-discharging the cell, which can also extend the service life of the cell.

 

4) high voltage

The voltage of 18650 lithium cell is generally 3.6V, 3.8V or 4.2V,  which is much higher than the 1.2V voltage of nickel-cadmium or nickel-metal hydride cells.

 

5) No memory effect

No need to empty the remaining power before charging, easy to use.

 

6) 18650 lithium cell can be assembled in series or parallel to battery pack

 

7) Wide range of use

18650 cell with size standard, can be used in different fields, a wide range of applications.

 

8) 18650 lithium battery pack: 

refers to the processing+ assembly + packaging of 18650 battery pack. The process of assembling 18650 cells into a group is called PACK, which can be a single 18650 cell, or a series-parallel 18650 battery pack. The 18650 battery pack is usually composed of plastic battery holder,  protective BMS,  cell, an output electrode port, nickel sheet for connection, and other insulating adhesive paper, double-sided adhesive paper, etc.

 

18650 Cell: The core part of the finished 18650 battery pack.

 

BMS protective board: to overcharge, over discharge, over current, short circuit, NTC temperature control intelligent protection and other functions.

 

Plastic battery holder: the supporting skeleton of the entire battery; Positioning and fixing of the protection plate.

 

Terminal port: can provide a variety of terminal line charge and discharge interface for a variety of electronic products, energy storage products, backup power supply.

 

Nickel sheet/bracket: connecting and securing components of the cell.