Brief introduction of cylinder lithium ion battery size and specification

Circular lithium battery refers to the cylindrical lithium-ion batteries. The first cylindrical lithium-ion batteries, 18650 lithium batteries, were invented in 1992 by the Japanese SONY company. Because 18650 cylindrical lithium-ion batteries have a long history, the market penetration rate is very high. Cylindrical lithium-ion batteries use quite mature winding process, and have high degree of automation, stable product quality and relatively low cost. Cylindrical lithium-ion battery has many types, such as 14650, 17490, 18650, 21700, 18650, etc. Cylindrical lithium-ion battery is relatively popular in lithium battery enterprises in Japan and South Korea. China also has a sizable enterprise production of cylindrical lithium battery.

As the further expansion of the electric car market and the continuous increase of requirements for duration, the vehicle enterprises come out with more severe requirements on energy density, manufacturing costs, cycle life and product additional properties. It becomes a direction to explore to gain great breakthrough in the field of raw materials under the premise of appropriate increase of the volume of a cylindrical battery. At present, Tesla has launched the large-scale production of 21700 batteries, and plans to use this on Tesla motors Model3. If the test passes on Tesla other models, it will replace all 18650 battery before. What Tesla's do will lead to a worldwide "21700 agitation".

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