Tesla: 20700 to replace 18650 battery?

Tesla, Inc. Plans to use 20700 high-performance lithium cobalt-acid batteries to replace the Panasonic 18650 battery cells , which is now widely used on Tesla cars to improve the performance of the model 3 new Cars.

To expand production and sales of products, Tesla activates the development of Model 3, which is expected to cost about half of the current basic model of Tesla, about 200 miles (320 kilometers) at about 35,000 $. Tesla CEO Elon Mask Want the Model 3 will compete with the BMW 3 Series.

The weight influences the car performance?

As for the difference between electric vehicles and conventional diesel locomotives, the industry debate is usually focused on the costs of lithium batteries and internal combustion engines. Looking for Alpha, the financial website of us, recently noted that the weight of the battery system is the key. The BMW 3 Series has a weight of 3,400 pounds (about 1.54 tons), while the Tesla model s up to 4,600 pounds (about 2.08 tons), with a battery weighing 1,600 pounds, which is almost a third of the car’s weight . To do this, Tesla decided to develop a new battery technology, “lose weight” for the battery system, thereby reducing the weight of the new car.

Let’s figure out the cost.

Currently, Tesla mainly uses the Panasonic 18650 lithium-cobalt-acid battery, the entire battery contains thousands of independent cells, the battery costs about 135 $ / kWh, to provide 233 W / kg of energy. The future of Tesla plans to launch a new 20,700 lithium battery pack. According to the definition of a lithium-ion battery, Type 18650 refers to a battery with a diameter of 18 mm, a length of 65 mm and a 0 for a cylindrical body, and for 20,700 a diameter of 20 mm, a length of 70 mm, a cylindrical cell. Although the latter is larger in size, the specific energy increases after improving the chemical composition (electrolyte and electrodes), thereby reducing the number of modules necessary to achieve the same power consumption and the overall weight of the battery are reduced. According to Tesla, once the battery reaches 333 W / kg, the Tesla 3 model will have the same weight as the BMW 3 Series.

Because the battery is much inferior to the gasoline engine and diesel engine in the energy density, large manufacturers are trying to improve the battery power density and light circuit for the car. BMW and 3, for example, can be 80 miles in a full battery, but the car is only about 3,400 pounds in weight , largely due to its lightweight carbon fiber body.