Classification, advantages and application fields of 18650 lithium battery packs. The 18650 lithium battery pack is the longest used lithium battery and still exists at present. The shadow of the 18650 lithium battery pack can be seen in many areas because this battery has obvious advantages compared with other batteries. And the security is relatively good, and has been used in large equipment.

18650 lithium battery pack classification

1. Classified by battery practical performance

Power battery and energy battery. Energy batteries are characterized by high energy density and are mainly used for high energy output; power batteries are characterized by high power density and are mainly used for batteries with instantaneous high power output and output.

2. According to electrolyte material

Lithium ion batteries are divided into liquid lithium ion batteries (LIB) and polymer lithium ion batteries (PLB). Liquid lithium ion batteries use liquid electrolytes (currently power batteries are mostly of this type). Polymer lithium-ion batteries are replaced by solid polymer electrolytes. This polymer can be in a "dry state" or a "colloidal state". At present, most of the polymer gel electrolytes are used. Regarding solid-state batteries, in a strict sense it means that the electrodes and electrolyte are both solid.

3. Classified by product appearance

The 18650 lithium battery components are: cylindrical, soft, and square. Cylindrical and square outer packagings are mostly steel shells or aluminum shells. The outer packaging of the soft pack is aluminum-plastic film. In fact, the soft pack is also a square shape. In the market, it is customary to call the aluminum-plastic film packaging as a soft pack. Some people call the soft pack battery a polymer battery.

18650 lithium battery has the following advantages

1. Wide range of use

Notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model airplanes, toys, camcorders, digital cameras and other electronic equipment.

2. Series

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

3. 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 below 35mΩ, which greatly reduces the self-consumption of the battery and extends the standby time of the mobile phone. The level of international integration. This kind of polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and has become the most promising product to replace Ni-MH batteries.

4. No memory effect

The 18650 lithium battery does not need to be empty before charging, so it is easy to use.

5. High voltage

The voltages of 18650 lithium batteries are generally 3.6V, 3.8V and 4.2V, which are much higher than the 1.2V voltages of nickel-cadmium and nickel-hydrogen batteries.

6. High safety performance

18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, and has passed RoHS trademark certification; various safety performances can be achieved in one go, and the number of cycles is greater than 500; high temperature resistance performance, discharge efficiency of 100% at 65 degrees . In order to prevent the battery from short-circuiting, the positive and negative electrodes of the 18650 lithium battery are separated. Therefore, the short-circuit phenomenon may have been reduced to the extreme. A protection board can be installed to avoid overcharge and overdischarge of the battery, which can also extend the service life of the battery.

7. Long service life

The 18650 lithium battery has a long service life. 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 the 18650 lithium battery is generally between 1200mah~3600mah, and the general battery capacity is only about 800. If the 18650 lithium battery is combined to form an 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

18650 lithium battery application field

Energy storage: 18650 lithium batteries are mainly used in base station power supplies, clean energy storage, grid power storage, household solar storage systems, etc.

Power category: 18650 lithium battery mainly refers to electric vehicles, electric bicycles, new energy vehicles, etc.

Digital: 18650 lithium batteries are mainly used in mobile phones, tablets, notebook computers, electric toys, MP3/MP4, earphones, power banks, model aircraft, mobile power supplies, etc.

The above is an introduction to the classification, advantages and application fields of 18650 lithium battery packs. After 30 years of development, the 18650 lithium battery pack preparation process has been very mature, in addition to greatly improved performance, its safety is also very complete. In order to avoid explosion of the sealed metal casing, 18650 batteries are now equipped with a safety valve on the top. The safety valve is the standard configuration of every 18650 battery and the most important explosion-proof barrier.

Self-produced 18650 cylindrical ion battery

Foreign Brand 18650 series battery cell