Lithium battery is a kind of chemical battery with high energy, high temperature and low adaptability. It basically has two types of lithium metal battery and lithium ion. Its main features are high energy density, high working voltage and low self-discharge rate. No memory effect. Among them, the low self-discharge rate is a more prominent advantage of the lithium battery . Cylindrical lithium-ion battery cells are usually represented by five digits. From the left, the first and second digits refer to the diameter of the cell, the third and fourth digits refer to the height of the battery, and the fifth digit represents the circle, then What are the cylindrical lithium-ion batteries of our common 18650 cylindrical lithium-ion battery? The following describes lithium batteries of several specifications.
1, 10440 battery
The 10440 battery is a lithium battery with a diameter of 10mm and a height of 44mm. It is the same size as what we often call "7th battery". This battery is usually small, only a few hundred mAh, and is mainly used in mini electronic products. For example, flashlights, mini stereos, loudspeakers, etc.
2, 14500 battery
The 14500 battery is a lithium battery with a diameter of 14mm and a height of 50mm. This is what we have always called the "5th battery". This battery is generally 3.7V or 3.2V, and the nominal capacity is relatively small, compared to 10440. The battery is larger, generally 1600mAh, and the discharge performance is superior. The application fields are mainly consumer electronics, such as wireless audio, electric toys, digital cameras and so on.
3, 16340 battery
The 16340 battery is a lithium battery with a diameter of 16mm and a height of 34mm. This battery has a short height and a small capacity, so it is used in strong light flashlights, LED flashlights, headlights, laser lights, lighting fixtures, etc. Often appear.
4, 18650 battery
The 18650 battery is a lithium battery with a diameter of 18mm and a height of 65mm. Its larger feature is its very high energy density, which is almost 170 watt-hours/kg. Therefore, this battery is a cost-effective battery. Most of the batteries that are often seen are because they are relatively mature lithium batteries. The quality of the system is stable in all aspects. It is widely used in battery capacity of about 10 kWh, for example, in small mobile phones, laptops, etc. on.
5, 21700 battery
The 21700 battery is a lithium battery with a diameter of 21mm and a height of 70mm. Because of its increased volume and space utilization, the cell core and system energy density can be improved. Its volumetric energy density is much higher than 18650. Type battery, widely used in digital, electric vehicles, balance cars, solar energy lithium battery street lights, LED lights, power tools, etc. The manufacturers of such batteries mainly include Tesla, Samsung, Panasonic, BAK, and lion new energy.
The 26650 battery is a lithium battery with a diameter of 26mm and a height of 65mm. The nominal voltage is 3.2V and the nominal capacity is 3200mAh. This battery has a good capacity and high consistency and has gradually become a replacement for the 18650 battery. In the power battery, many products will gradually favor this.
7, 32650 battery
The 32650 battery is a lithium battery with a diameter of 32mm and a height of 65mm. This battery has a strong discharge capacity, so it is suitable for electric toys, backup power supplies, ups batteries, wind power generation systems, and wind-solar hybrid power generation systems.
In addition to these, there are 18350, 26700, 32700, etc.