18650 battery and 21700 battery concept

Before entering the field of new energy vehicles, 18650 batteries have been widely used in electronic products. It is the earliest, most mature and most stable lithium battery. After years of accumulation of relevant experience, Japanese manufacturers have applied the advanced technology accumulated in consumer products in 18650 batteries to the field of automotive batteries. Panasonic is one of the largest battery technology and scale companies in the world. Compared with other manufacturers, its products have fewer defects, large size, and easy selection of batteries with good consistency. With the vigorous development of new energy vehicles in recent years, lithium batteries have also become popular. Power lithium-ion batteries have always been an important field of new energy vehicles. Whoever masters power lithium-ion batteries will master new energy vehicles. Among the power lithium-ion batteries, the most concerned is the lithium battery. Lithium batteries have a high energy density, their capacity is 1.5 to 2 times that of a nickel-hydrogen battery of the same weight, and the self-discharge rate is very low. In addition, lithium batteries have almost no memory effect and no toxic substances. These advantages of lithium batteries make them widely used in the field of new energy vehicles. Currently, there are 18,650 and 21,700 cylindrical lithium batteries that are most widely used. 18650 battery: 18650 battery originally referred to nickel-metal hydride batteries and lithium batteries, because nickel-metal hydride batteries are now less used, so they now refer to lithium batteries. 18650 is the originator of the lithium battery, which is the standard lithium battery adopted by Sony in Japan in order to save costs. 18 is a diameter of 18mm, 65 is a length of 65mm, and 0 is a cylindrical battery. Common 18650 batteries include ternary lithium batteries and lithium iron phosphate batteries. The 18650 battery, which is widely used at present, has a history of development for many years. Although it is more mature than other types of battery technology, it still faces problems such as high heat production, complex grouping, and inability to achieve fast charging. In this context, 21,700 cylindrical ternary batteries were formed. On January 4, 2017, Tesla announced the start of mass production of the new 21700 battery jointly developed with Panasonic, and emphasized that this battery has the highest energy density and the lowest cost among mass-produced batteries. 21700 battery: The battery 21700 is a type of cylindrical battery, specifically: 21 refers to the cylindrical battery with an outer diameter of 21mm; 700- refers to the cylindrical battery with a height of 70.0mm. This is to meet the requirements of electric vehicles for longer driving range, improve the effective use of car battery space, and develop a new model. With the same material, the capacity of 21700 compared with ordinary 18650 cylindrical lithium batteries can be more than 35% higher. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to take the technical route of electric vehicle batteries in my country?