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What is a 21700 battery

What is a 21700 battery? The meaning of 21700 battery specifically refers to a cylindrical battery with an outer diameter of 21mm and a height of 70.0mm. Currently, companies from multiple countries such as South Korea, China, and the United States are using this model. At present, XTAR has two 21700 batteries on sale, namely 217004200mAh and 217003750mAh. There is a larger capacity 217005000mAh that will be launched soon.

The Origin of 21700 Batteries

When it comes to the emergence of 21700 batteries, it is inevitable to mention Tesla. The 21700 battery was first developed by Panasonic for Tesla in the United States. At the investor meeting on January 4, 2017, Tesla announced the start of mass production of a new 21700 battery jointly developed with Panasonic, which will be produced at Gigafactory Super Battery Factory. Tesla CEO Musk stated that the 21700 battery has the highest energy density and lowest cost in the world, and its price will be more affordable.

On July 28, 2017, the first Tesla Model 3 equipped with 21700 batteries was delivered, becoming the world's first 21700 pure electric passenger car with a minimum price of $35000. The emergence of 21700 batteries has made the Model 3 Tesla's most affordable model to date.

It can be said that the Tesla Model 3 is fully equipped with 21700 batteries, ushering in a new stage of increasing capacity with cylindrical batteries.

The advantages of 21700 batteries

Industry analysts analyze that the energy density of the 21700 battery is higher than that of the well-known 18650 battery. The number of individual batteries can be significantly reduced during use, and the cost will actually decrease after grouping.

The 21700 battery system of Model 3 has an energy density of around 300Wh/kg, which is more than 20% higher than the 18650 battery used in the original Model S. The individual capacity is increased by 35%, and the system cost is reduced by about 9%. From the beginning, the huge advantage of 21700 has attracted widespread attention and research in the industry.

It can be imagined that a 18650 battery has a capacity of around 2600-3600 milliamperes, while a 21700 battery supports over 4000 milliamperes. Currently, 217005000mAh is available on the market. And larger capacity is more conducive to extending the range of modern equipment.

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