18650 battery

18650 refers to the shape specification of the battery. It is a standard battery model set by Sony Corporation of Japan in order to save cost in that year, in which 18 indicates that the diameter is 18mm, 65 indicates that the length is 65mm, and 0 indicates that it is a cylindrical battery.

18650 battery originally refers to Ni MH battery and lithium-ion battery. Because NIMH is not commonly used at present, it refers to lithium-ion batteries. Because its positive electrode is a battery using lithium cobalt oxide or lithium manganate or ternary material lithium nickel cobalt manganate as the positive electrode.

The nominal voltage of a single 18650 lithium-ion battery is usually 3.6V or 3.7V, the minimum discharge termination voltage is usually 2.75V, and the ordinary capacity is 1200 ~ 3100mah.


Advantages of 18650 lithium battery:

1. Wide application range

It is widely used in all kinds of electronic equipment, such as notebook computers, walkie-talkies, portable DVDs, instruments, audio equipment, aviation models, toys, cameras, digital cameras, etc.

2. Tandem

It can be combined in series or in parallel to form a 18650 lithium battery pack.

3. Low internal resistance

The internal resistance of polymer batteries is less than that of ordinary liquid batteries. The internal resistance of household polymer batteries can even be less than 35m Ω, which greatly reduces the self-consumption of the battery. This polymer lithium battery supporting a large discharge current is an ideal choice for a remote control model. It has become the most promising product to replace Ni MH batteries.

4. No memory effect

There is no need to empty the remaining power before charging, which is convenient to use.

5. High voltage

The voltage of the 18650 lithium battery is usually 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries.

6. High safety performance

18650 lithium battery has high safety performance, no explosion and no combustion; Nontoxic, pollution-free, ROHS trademark certification; The number of cycles is greater than 500; Good high-temperature resistance, discharge efficiency up to 100% at 65 degrees. In order to prevent battery short circuits, the positive and negative poles of the 18650 lithium battery are separated.

Therefore, the possibility of short circuit has been minimized. Protective plates can be added to avoid overcharge and over-discharge of the battery, which can also prolong the battery life.

7. 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.

8. Large capacity

The capacity of 18650 lithium battery is usually between 1200mAh and 3600mAh. If 18650 lithium batteries are combined to form 18650 lithium battery packs, 18650 lithium battery packs can easily exceed 5000mAh.