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18650 battery
Time:2022-04-09 10:56:58        Hits:【 】second


What is the 18650 cell? What are the characteristics of 18650 cells? What are the production processes of 18650 cells? The numbers 18650 in the 18650 cell represent the appearance size: 18 means the diameter is 18mm, 65 means the length is 65mm, and 0 means the cylindrical cell.

1. What is the 18650 cell?

18650 refers to the external specification of the cell, which is a standard cell model set by Japan's SONY company in order to save costs. The numbers 18650 in the 18650 cell represent the appearance size: 18 means the diameter is 18mm, 65 means the length is 65mm, and 0 means the cylindrical cell. Common 18650 batteries are divided into lithium-ion batteries, lithium iron phosphate and nickel-hydrogen batteries.

2.the characteristics of 18650 cells

1) Large capacity

The capacity of 18650 lithium battery is generally between 1200mah and 3600mah, and the general battery capacity is only about 800mah. If combined into a 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

2) Long life

The 18650 lithium battery has a long service life, and the cycle life can reach more than 500 times during normal use, which is more than twice that of ordinary batteries.

3) High safety performance

18650 lithium battery has high safety performance, no explosion, no combustion; non-toxic, non-polluting, RoHS trademark certification; various safety performances in one go, the number of cycles is more than 500 times; good high temperature resistance, discharge efficiency of 100% under the condition of 65 degrees . In order to prevent the short circuit of the cell, the positive and negative poles of the 18650 lithium battery are separated. Therefore, the possibility of short-circuiting has been reduced to the extreme. A protection board can be installed to avoid overcharging and overdischarging of the battery, which can also prolong the service life of the battery.

4) High voltage

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

5) No memory effect

It is not necessary to empty the remaining power before charging, which is convenient to use.

6) Small internal resistance

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 below 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. level with international standards. This 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 nickel-metal hydride batteries.

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

8) Wide range of use

The 18650 cell size standard can be used in different fields and has a wide range of applications.

3. 18650 lithium battery pack PACK

The 18650 lithium battery pack refers to the processing, assembly and packaging of the 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 casing, protective plate, battery core, output electrode, contact piece for connection, and other insulating tapes, double-sided tapes, etc.

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

Protection board: Plays the functions of overcharge, overdischarge, overcurrent, short circuit, and NTC temperature control intelligent protection.

Plastic shell: the supporting skeleton of the entire battery; the positioning and fixing of the protection plate; carrying and limiting all other non-shell parts.

Terminal lead: Various terminal wire charging and discharging interfaces can be provided for various electronic products, energy storage products, and backup power supplies.

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

4. Application fields of 18650 battery pack

The application of lithium secondary batteries in the energy battery industry benefits from its superior performance. With the continuous development of lithium secondary battery technology, it has been widely used in our daily life; rechargeable batteries that are used many times are more and more favored by consumers. Pay attention to the energy battery industry, fully understand the battery and let us "use it for me". At present, 18650 lithium battery has certain applications in the following fields.

1) Energy storage: Mainly used in base station power supply, clean energy storage, grid power storage, home solar storage system, etc.

2) Power category: mainly refers to electric vehicles, electric bicycles, new energy vehicles, etc.

3) Digital categories: mobile phones, tablets, laptops, electric toys, MP3/MP4, headphones, power banks, mobile power supplies, etc.

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