Introduce cylindrical lithium-ion battery categories

Cylindrical lithium batteries are divided into lithium cobalt oxide, lithium manganese oxide, and ternary materials. The three kinds of data system batteries have different advantages. The batteries are widely used in: notebook computers, digital cameras, lighting fixtures, toy products, power tools, portable mobility, etc.

Structure of cylindrical lithium battery

The circular lithium battery refers to the cylindrical lithium battery. The earliest cylindrical lithium battery was the 18650 lithium battery invented by SONY in 1992. Because the 18650 cylindrical lithium battery has a long history, the popularity of the market is very high. Cylindrical lithium battery adopts proper and mature winding process, high degree of automation, stable product quality, and relatively low cost. There are many types of cylindrical lithium batteries, such as 14650, 17490, 18650, 21700, 26650 and so on. Cylindrical lithium batteries are more popular among lithium battery companies in Japan and South Korea, and there are also companies of appropriate scale in China that produce cylindrical lithium batteries.

Classification of various types of cylindrical lithium batteries

With the further expansion of the electric vehicle market and the continuous improvement of the requirements for battery life, vehicle companies have put forward higher requirements for power batteries in terms of energy density, manufacturing costs, cycle life, and product additional features. Under the premise that a huge breakthrough has not been made in the field of original materials, appropriately increasing the volume of the cylindrical battery to obtain more battery capacity has become a direction that can be explored. Now, Tesla has started the large-scale production of 21700 batteries and plans to use them on Tesla Model 3. If it passes the test on other Tesla models, it will replace all the 18650 batteries previously used. The practice of pulling may lead a “21700 trend” internationally.

Introduce cylindrical lithium-ion battery categories

Classification of various types of cylindrical lithium batteries

1. Cylindrical primary batteries, mainly No. 5 and No. 7 batteries, other types are not introduced one by one, please consult the manufacturer for details;

AA battery, the general dimensions are: diameter 14mm, height 49mm;

The general dimensions of the 7th battery are: diameter 11mm, height 44mm.

2. Cylindrical lithium batteries, the main types are 18650, 16650, 14500, etc.

18650 means 18 mm in diameter and 65 mm in length. The AA battery type is 14,500, 14 mm in diameter and 50 mm in length. Generally, 18650 batteries are used more in industry and few in civilian use. The common ones are also used in notebook batteries and high-end flashlights.

The 18650 is only the standard type of battery. According to the battery type, it can be divided into 18650 for lithium ion, 18650 for lithium iron phosphate, 18650 for nickel metal hydride (rarely), and the common 18650 is for lithium ion.

1. The capacity of a large-capacity 18650 lithium battery is generally between 1200mah and 3400mah.

2. 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.

3. High safety function 18650 lithium battery has high safety function. 18650 was born in 1996. After decades of development, 18650 lithium battery has now completed fully automated production. The battery’s voltage, internal resistance, capacity, and self-discharge are very consistent. It is good, and it is now the priority selection type of various occupations; the high temperature resistance function is good, and the discharge power is 100% under the condition of 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 possibility of short-circuit phenomenon has been reduced to the extreme. A protective board can be installed to avoid overcharge and overdischarge of the battery, which can also extend the service life of the battery.

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

5. There is no memory effect. It is not necessary to empty the remaining power before charging, which is convenient to use.

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

7. Wide range of applications: notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model airplanes, toys, camcorders, digital cameras, new power vehicles, medical professions and other electronic equipment.

8. In the case of the same brand, the price of the battery is more advantageous. The various parts of the battery have been manufactured in mature and large quantities. In the production cost, the production cost is greatly reduced, so the price/performance ratio is the best choice.

Post time: Jan-08-2022