Details of the new Tesla batteries revealedOctober 19, 2020
At the end of September 2020, Tesla showed a new generation of battery cells for its electric cars. The company plans to independently produce elements 4680, which have a number of advantages over the currently used 2170. Engineers of one of the authoritative editions Insideevs told about the features of such “cans”.
The dimensions of the new elements are 46×80 millimeters, which is why they got their name. In addition to the fact that such batteries have become cheaper to manufacture, they are characterized by two more important properties – faster charging speed and longer service life.
At an ambient temperature of 35 ° C, the charging time for the new 4680 batteries was reduced from 10 to 80% from 25 to only 15 minutes. In addition, in just seven minutes, the new Tesla batteries are able to charge up to 50%, which is enough to cover the 200 kilometers in the case of the Tesla Model 3.
Changes in the design of the batteries have led to the fact that the charging capacity of the 4680 cells has increased from 250 to 275 kW. Moreover, this power is maintained until the charge level reaches 50%. Due to natural heating, when the temperature reaches 45 ° C, a smooth decrease in the charge current begins to prevent overheating and degradation of the elements.
Fast charging of 4680 cells is made possible by reducing the initial internal cell resistance to 3 mΩ. At 80% charge, it is 2 mΩ. Moreover, both indicators are ten times lower than the values of 2170, which are characterized by resistances of 23 mΩ and 30 mΩ, respectively.
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