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Mentioned electric cars, people always use the same criteria to judge the performance of an electric vehicle: endurance. At present, due to battery constraints, most of the electric car mileage is very limited, which also hindered the development of electric vehicles . many electric car companies focus on research and development of better battery life, in order to occupy the industry high ground. The United States Tesla announced the independent design of a new type of lithium batteries - 21-70 type battery, performance than the previous lithium battery.
Since its inception, Tesla has been committed to the development of "sustainable transport". The new research and development of 21-70 lithium battery cell diameter of 21 mm, height of 70 mm, cylindrical, slightly larger than Panasonic 18650, and more energy storage. Tesla said its energy plant will begin production of this specification from 2017 lithium battery, once the 21-70 battery put into use, Tesla cars used in the main technology, will be in their own hands.
At present, electric cars generally use lithium-ion secondary battery (lithium battery), and Tesla electric vehicles using ternary metal (nickel, manganese and cobalt) oxide mixture of cathode materials for lithium batteries, some of our advanced electric vehicles Producers use lithium iron phosphate as the cathode material lithium iron phosphate battery. It can be seen, the current international choice for the electric car battery does not have a certain standard in the industry has been there ternary metal oxide lithium battery and lithium iron phosphate battery line of the dispute.
Ternary metal oxide lithium battery with high energy density, good cycle, but mainly for portable computers and other portable electronic products for electric vehicles there is a certain risk: low risk, including leakage, deformation, high-risk, including combustion, explosion and so on. Tesla an electric Tesla car on the need for nearly ten thousand such a lithium battery, battery management system is not only complex and large, high cost, security has also been affected. In recent years, the online public reports of the Tesla electric car burning event is not uncommon. Lithium iron phosphate battery is relatively safe, but the energy density is low, the discharge platform is too flat, easy to do battery control, mileage also need to be improved. Therefore, whether it is safe as a standard or mileage as a standard is the industry's general debate.
Tesla to abandon the Panasonic 18650 battery and the introduction of 21-70 battery, not only an increase in the level of battery storage, but also shows Tesla in the electric car industry standard-setting ambitions. At present, the electric vehicle lithium battery standard has become a lot of technology developed countries and large enterprises of great concern to a problem. Technically speaking, a country or an enterprise is difficult in a short period of time to develop relevant industry standards, but in a few years, by a real leading technology companies to develop some standards, and gradually regulate the direction of technological development, it is possible.
Of course, the choice of electric vehicle batteries is not only the two roads can go. With the development of science and technology, such as graphene and nano-lithium batteries such as the performance of new batteries amazing, most likely in the near future out of the laboratory, mass production. With the increasingly serious air pollution, fossil resources on the verge of exhaustion, to electric cars as the representative of the new energy vehicles will be the general trend, including innovation and leap must also be just around the corner. By then, the electric car market development and standard-setting will be a new scene.