Tesla uses 18650 batteries produced by Panasonic, and these batteries will be replaced by new 21700 batteries when Model 3 is officially mass-produced, becoming the new cells.
Tesla chooses to use ternary lithium batteries because the positive electrode of these batteries uses nickel, cobalt, and manganese materials, which is currently a popular type of battery. Many pure electric vehicles use ternary lithium batteries. The advantage of ternary lithium batteries lies in their lightweight and high energy density, making them very suitable for pure electric vehicles.
However, some pure electric vehicles choose to use lithium iron phosphate batteries, which have better safety but lower energy density and weight compared to ternary lithium batteries. Tesla uses 18650 batteries from Sony, which are similar in size to AA batteries, and there are 8000 batteries in a Tesla car.
Tesla's battery pack is usually installed on the chassis, which is also the design of most pure electric vehicles. This effectively lowers the center of gravity of the whole vehicle and improves stability.
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