Regarding this "Battery Day" activity, Musk has been selling batteries. He once said on Twitter that Tesla is expected to mass-produce batteries with a longer life and an energy density of 400Wh/kg within 3-4 years. Compare the batteries currently on sale (current model? 3 battery is about 260Wh/kg), and the energy density of the new battery can be increased by about 50%.
In addition, it is speculated that four new technologies will be released this time: million-mile battery, cobalt-free battery, dry electrode technology and silicon nanowire technology.
Millions of miles of electricity?
The battery determines the cruising range and cost control of a car. As a leader in the electric vehicle industry, Tesla has also made a lot of efforts in the field of batteries. In 20 15, Jeff Dane's team, focusing on the industrialization of lithium battery technology, entered Tesla to develop lithium-ion batteries with longer life, lower cost and higher energy density. At the end of September last year, Jeff Dane's team published a paper introducing the new generation of lithium-ion batteries they are testing. Using a new generation of single crystal cathode and new electrolyte, the service life of the newly developed power battery will exceed 6.5438+0.6 million kilometers (6.5438+0.6 million miles).
Cobalt-free electricity?
At present, Tesla electric vehicles mainly use NCA ternary lithium batteries, and cobalt metal is needed in the production process. However, as a scarce metal, cobalt has a small output and uneven distribution, which is very difficult for sustainable application in the future, which is not conducive to industrial development. It is necessary to find alternative technologies.
There have been many scandals before, mentioning that Tesla is cooperating with Contemporary Ampere Technology Co., Ltd. to develop cobalt-free batteries, and its research direction tends to be lithium iron phosphate batteries. What is the domestic model of the current version of lithium ferrous phosphate? 3 has also appeared in the new car catalogue of the Ministry of Industry and Information Technology.
Electrode technology
20 19 in may, Tesla spent 2180,000 USD to acquire Maxwell. Maxwell, founded in 1965 and headquartered in San Diego, USA, is the number one supercapacitor manufacturer in the world, with the famous "dry electrode technology patent+supercapacitor" as the core of battery business. Dry electrode technology is also likely to be one of the technological breakthroughs that Musk may announce on this battery day.
Dry electrode can produce thicker electrode, which greatly improves the energy density of the battery. The highest energy density of ternary lithium battery cells made by this process can reach 500Wh/kg, while the energy density of mainstream ternary lithium battery cells is about 300Wh/kg at present. Another advantage is that after the battery is used, it can make up for the capacity attenuation of the battery by constantly supplementing lithium metal, while the electrode prepared by wet electrode method is difficult to supplement metal material.
Silicon nanowire technology
This technology is relatively confidential and has not been disclosed before. Volkswagen just guessed from Tesla's latest battery day poster. There are some abstract lines on the poster of Tesla Battery Day, which is a structural diagram of a new battery material-silicon nanowire, so some overseas media believe that Tesla will release a brand-new battery based on silicon nanowire technology on Battery Day, instead of the dry electrode technology previously rumored.
According to reports, after adopting silicon nanowire technology, the weight of the battery will be reduced by half, and the space occupied will be half that of the current lithium-ion battery, and the energy density of the battery with the same volume will be higher.
Tesla's global delivery in the first half of the year reached 6.5438+0.79 million vehicles. What models? S/X delivered 22,800 vehicles, model? 3/Y delivered 65,438+056,300 vehicles, of which 45,754 vehicles were delivered by the Shanghai factory. In 2020, Tesla plans to sell 500,000 cars. In the future, with the continuous introduction of new models, the rapid increase of production capacity and the acceleration of localization process, industrial chain stocks are expected to continue to benefit.
Less than a week before Tesla's "Battery Day", let's expect what surprises Musk will bring to people.
(photo/text/photo: all-electric? Tang Ke)
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.