Why is the 21700 battery on fire?
As Tesla Model 3 began to use 21700 lithium batteries to replace the previous 18650 batteries, there must have been many small partners who have discovered that the application of 21700 batteries has become more and more extensive. Everyone has more and more 21700 batteries on hand. Recall that it seems that it is not far away from when everyone was using 18650 batteries. Although 18650 batteries are still in use, the mass production of 21700 batteries cannot be ignored. What is the reason why the 21700 battery has gradually become popular? Today, let's analyze it with you.
What is 21700 battery
What is a 21700 battery? The definition of 21700 battery specifically refers to a cylindrical battery with an outer diameter of 21mm and a height of 70.0mm. Now companies in South Korea, China, the United States and many other countries are using this model. Currently, XTAR has two 21700 batteries on sale, namely 21700 4200mAh and 21700 3750mAh. The larger capacity 21700 5000mAh will be launched soon.
The origin of 21700 battery
When it comes to the emergence of 21700 batteries, Tesla has to be mentioned. The 21700 battery was first developed by Panasonic for Tesla. At the investor meeting on January 4, 2017, Tesla announced the start of mass production of the new 21700 battery jointly developed by Tesla and Panasonic. This battery will be produced at the Gigafactory super battery factory. Tesla CEO Musk said that the power density of the 21700 battery is currently the world's highest energy density and lowest cost battery, and the price will be more approachable.
On July 28, 2017, the first Tesla Model 3 equipped with 21700 batteries was delivered, becoming the first 21700 pure electric passenger car in the world, with a minimum price of 35,000 US dollars. The emergence of 21700 batteries made Model 3 a Tesla so far The most affordable model.
It can be said that the Tesla Model 3 fully uses the 21700 battery, opening a new stage of increasing the capacity of the cylindrical battery.
Advantages of 21700 battery
Industry analysts analyze: The energy density of the 21700 type battery is higher than that of the well-known 18650 type battery. The number of single cells in use can be greatly reduced, and the cost will be reduced after grouping.
Model 3's 21700 battery system has an energy density of about 300Wh/kg, which is more than 20% higher than the original 18650 battery used in Model S, with a 35% increase in cell capacity and a 9% reduction in system cost. From the very beginning, the huge advantages of 21700 have aroused widespread concern and research in the industry.
It is conceivable that a 18650 battery has a capacity of about 2600-3600 mAh, and a 21700 battery supports more than 4000 mAh. At present, 21700 5000mAh has appeared on the market. The larger capacity is more conducive to extending the battery life of modern equipment.
21700 battery application
With its advantages in energy density, the 21700 battery will have a very broad market application in the future. On August 4, 2017, the GB/T34013-2017 "Specifications and Dimensions of Power Batteries for Electric Vehicles" published by the National Standards Committee clearly included 21700 specifications. This means that the application of 21700 batteries in domestic new energy vehicles has received policy support.
In addition, it is more convenient for battery manufacturers to transition from the original mainstream 18650 to 21700, and will not invest too high equipment technical transformation costs and new equipment investment. Some professionals predict that 21700 batteries will usher in a growth period in the future. So far, domestic Yiwei Lithium Energy, Smart Energy and Suzhou Lishen have deployed 21700 battery products. In addition to new energy vehicles, 21700 has also begun to be used on chargers, e-cigarettes, flashlights, handheld PTZ and other devices
