What are the types of cylindrical lithium batteries?

  What are the model and specifications of the cylindrical lithium battery? Mainstream lithium battery packages have three forms, namely cylindrical, square and soft bag. Cylindrical lithium batteries have many models, such as the commonly available 18650, 14650, 17490, 18650, 21700, 26650, and the like. Cylindrical lithium batteries are more popular in Japan, and Korean lithium batteries, and there are also quite large enterprises in China to produce cylindrical lithium batteries.   What are the model specifications of the cylindrical lithium battery? The cylindrical lithium battery is divided into lithium cobaltate, lithium manganese acid, and a ternary material. The three material systems have different advantages, and the battery is widely used in: laptops, digital cameras, lighting fixtures, toys products, electric tools, portable transfer energy, etc.   1,10440 batteries The 10440 battery is a lithium battery having a diameter of 10 mm and a height of 44 mm. Like us, it is often called "No. 7 battery", which is generally small, only a few hundred mAh, mainly applied in mini electronic products. For example, flashlights, mini audio, loudspeakers, etc.   2,14500 battery The 14500 battery is a lithium battery having a diameter of 14mm and a height of 50 mm. This is also a specific size we have been called "No. 5 battery". This battery is generally 3.7V or 3.2V, the nominal capacity is relatively small, than 10440 The battery is large, generally 1600mAh, superior discharge performance, the most important application field is the consumer electronic class, such as wireless audio, electric toys, digital cameras, etc.   3,16340 battery The 16340 battery is a lithium battery having a diameter of 16mm and a height of 34mm. This battery is shorter than the ruler, and the capacity is not very small, so the light flashlight, LED flashlight, headlight, laser lamp, lighting fixture, etc. It often appears.   4,18650 battery The 18650 battery is a lithium battery having a diameter of 18mm and a height of 65mm. Its biggest feature is to have very high energy density, almost 170 watt / kg, so this battery is a good battery, we usually often Most of these batteries are this battery, because it is a more mature lithium battery, and the system quality stability is better, widely applied to battery capacity at 10 kWh, for example, on mobile phone, laptop, etc. Small electrical appliances .   5,21700 battery 21700 The battery is a lithium battery having a diameter of 21mm and a height of 70 mm. Because its volume increases, the spatial utilization is large, the cell monomer and the system energy density can be improved, and its volume energy is much higher than 18650. Battery, widely used in digital, electric vehicles, balance cars, solar energy lithium battery lights, LED lights, electric tools, etc.   Structural characteristics of the cylindrical lithium battery (1) Generally, a cylindrical lithium battery is composed of housing, cap, positive electrode, negative electrode, diaphragm, and electrolyte. Generally, the battery housing is the negative electrode of the battery, the cap is the positive electrode of the battery, and the battery housing is a nickel plated steel sheet. (2) The power-type cylindrical lithium battery is mainly distinguished by the electrically conductive connection structure of the battery, as the power battery is generally widely applied, requiring a special large current structure design. In order to combine the connection, the special connection combination device is designed, such as the positive and negative poles of the battery, and the conductive capability is also enhanced. Cylindrical lithium batteries use considerable mature winding processes, high automation, stable product transmission, and relatively low cost.   Advantages of cylindrical lithium battery 1 The cylindrical lithium battery has formed a series of international unified standard specifications and models, and the process is mature, suitable for large quantities of continuous production. 2 Cylindrical specific surface area is large, and the heat dissipation is good. 3 Cylindrical lithium batteries are generally sealed battery, and there is no maintenance problem during use. 4 Lithium battery housing is high, and there will be a square, soft package battery expansion during use.   Soft bag lithium battery Soft boiler lithium batteries are pursuing more slim volumes because of the superposed manufacturing methods, the weight is also lighter in the same capacity density. Similarly, the soft bag battery can also be customized according to the application needs, small to our mobile phone battery size, large to the application in new energy cars.   The soft bag battery has also been taken as the first choice on the mobile device, but in the automotive application, because of the controllability of its volume, it is also valid by the car brand, especially for plug-in hybrid vehicles, taking into account the full car layout and When weighing, the soft package battery is more obvious.   Square lithium battery The plasticity of square lithium batteries will be stronger, which can be customized according to the specific needs of the product. Therefore, the size is different, and there is no standard division as the cylindrical battery is not clear regardless of the manufacturing process or application standard. However, it is also because of its high flexibility.   For a long time, in the early new energy vehicles, the vehicle enterprises can customize the design of the square battery according to the model requirements, without being limited by the cylindrical battery standard. Square batteries have also been considered to be the battery design for new energy automobile applications.   Under the premise of domestic policy, the high-energy density, low weight of the soft bag battery is its greatest advantage, enough to make the manufacturer and supplier tend to choose it.   However, its monomer battery consistency needs to be improved, and it is also necessary to continuously improve the industry standards of cylindrical lithium batteries, and the improvement of core technology is also the key to the future soft bag battery to become mainstream. 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