What Type of Battery Does Tesla Use?
1 Answers
Tesla utilizes 18650 batteries produced by Panasonic. After the official production of the Model 3, the new 21700 battery will replace the 18650, becoming the new cell. More details about Tesla's batteries are as follows: 1. Tesla's earliest Roadster used Panasonic's NCR18650A battery, with a rated voltage of 3.6V and a capacity of 3.1Ah. The previous 85kWh battery pack used the NCR18650B battery, with a rated voltage of 3.6V and a capacity of 3.1Ah. 2. The 21700 battery is a ternary lithium battery, with the cathode material being lithium nickel cobalt aluminum oxide (NCA). This cylindrical ternary battery currently offers the highest energy density among power battery solutions. Compared to prismatic batteries, although this type of battery has higher energy density, its stability is poorer, requiring excellent BMS (Battery Management System) support. 3. Under current conditions, the energy density of the 21700 battery system is around 300Wh/kg, approximately 20% higher than the original 18650 battery system's 250Wh/kg. Additionally, according to Panasonic's test data on power lithium battery cells, the volumetric energy density of its 21700 battery is significantly higher than that of the 18650 battery cell. The improvement in single-cell energy density far exceeds the 20% increase observed after grouping.