18650 battery flat top

　　Advantages of 18650 battery and 21700 battery

　　With the development trend of new energy vehicles in recent years, lithium batteries have also become popular.

　　Now widely used cylindrical lithium-ion batteries include 18650 batteries and 21700 batteries

　　18650 lithium battery:

　　18650 lithium batteries originally referred to nickel-metal hydride batteries and lithium-ion batteries. Because nickel-metal hydride batteries are used less now, they often refer to lithium-ion batteries. 18650 is the ancestor of Kaishan lithium-ion battery - the standard lithium-ion battery model originally established by Japan's Sony Corporation to reduce costs. Among them, 18 have a specification of 20mm, 65 have a length of 65mm, and 0 are cylindrical rechargeable batteries. Ordinary 18650 rechargeable batteries are lithium-ion batteries and lithium iron phosphate batteries.

　　In terms of 18650 rechargeable batteries, it is necessary to mention Tesla Motors. It detected many types of rechargeable batteries in the development and design of pure electric vehicles, but finally locked the overall goal of 18650 rechargeable batteries and used 18650 Lithium ion is a key technology for new energy electric vehicles. It can be said that aside from the technical nature of the electric motor, Tesla electric motors can generally have no less batteries than traditional gasoline cars, and Tesla's excellent new batteries. So why did Tesla choose 18650 rechargeable battery as the driving force?

　　Advantage

　　High consistency of processing technology

　　Before entering the new energy vehicle industry, 18650 rechargeable batteries have been widely used in electronic equipment. They are the first, most perfect and most stable lithium batteries. After years of accumulated experience, Japanese manufacturers have accumulated 18650 rechargeable batteries in consumer products in the automotive battery industry Excellent technical application. Konka is one of the new battery and large enterprises in the world. Compared with other manufacturers, the disadvantage of commodity is at least large-scale operation, which is also conducive to screening out consistent batteries.

　　In contrast, other rechargeable batteries such as lithium-ion batteries are far from perfect, and many products cannot be unified in terms of specifications and sizes. In general, the battery is not as consistent as the 18650 battery. If the consistency of the rechargeable battery is not enough, many management methods of series and serial lithium-ion batteries will not be able to fully develop the characteristics of each rechargeable battery as soon as possible, and the 18650 lithium-ion battery can effectively solve this problem.

　　High safety factor

　　The 18650 lithium battery has a high safety factor, no explosion, no ignition; non-toxic, non-polluting, and has passed Rohs brand certification; heat-resistant, 65-degree standard charging and discharging high efficiency of 100%. And choose aluminum alloy casing, under the influence of extreme conditions, can avoid production safety accidents, and the safety factor is high. In addition, each rechargeable battery module of the 18650 is small in size, and each module has a certain kinetic energy operating range. Compared with large rechargeable battery modules, it can reasonably reduce the harm caused by common failures.

　　high energy density

　　The capacity of 18650 lithium-ion batteries is generally between 1200mah-3600mah, and the average battery capacity is only 800mah. Its capacity is 1.5-2 times of the net weight of the Ni-MH rechargeable battery, and the life-span of the lithium-ion battery is very low. At present, considering Tesla's high mileage requirements, the specific energy of the 18650 lithium-ion core can reach the level of 250wh/kg.

　　Low cost and high cost performance

　　The 18650 lithium-ion battery has a long service life, more than 500 times longer than all normal applications. The 18650 product has a high level of technical perfection, the overall design and production technology also includes production and manufacturing machinery and equipment, and its derivative 18650 touch group has perfect technology, which reduces its operating and maintenance costs.

　　At present, 18650 rechargeable batteries have been widely used in the development trend for many years. Compared with other types of new batteries, although relatively perfect, they still face problems such as high production heat, complex combination, and inability to complete fast charging. In this case, the 21700 cylindrical three-dimensional battery should be born.

　　On January 4th, Tesla announced that the new 21700 rechargeable battery developed in cooperation with Kangjia has just started mass production, and is currently striving to become the largest and cheapest rechargeable battery.

　　21700 battery:

　　The rechargeable battery 21700 is a type of cylindrical battery, which actually means: 21-means the diameter of the cylindrical rechargeable battery is 21mm; 700-means the aspect ratio of the cylindrical rechargeable battery is 70.0mm.

　　Combining the regulation of the long mileage of electric vehicles, a new rechargeable battery model is developed to improve the reasonable utilization of rechargeable batteries. With the same raw material, the volume of 21700 can be higher than 35% compared with ordinary 18650 cylindrical lithium ions. The contact parts of the ames21700 lithium power plug are designed with copper-copper rods, which have strong anti-instantaneous working ability and large current-carrying capacity.