21700 compared to 18650 battery.
People may not be familiar with the 21700 battery, which is actually a battery specially produced by Tesla. This was a particularly popular battery at the time, and under the trend of new energy Tesla batteries, this battery also became very popular. Now let's take a detailed look with everyone: "What is the 21700 battery? Is the 21700 lithium battery powerful.
What is a 21700 battery?
Everyone knows that more batteries can help optimize battery capacity and energy density, while smaller batteries are difficult to directly improve energy density through process control and raw material angles, effectively reducing battery costs.
As cylindrical lithium batteries, the 21700 model has a diameter of 21 millimeters and a length of 70 millimeters. In terms of theoretical maximum value, it is definitely more advantageous than the 18650 model (diameter of 18 millimeters and length of 65 millimeters). Therefore, the 2170 lithium battery is being used in the Model 3 for a new round. 21700 lithium batteries mainly refer to: 21- mainly including cylindrical batteries with an outer diameter of 21mm; The height of a cylindrical battery is 700 millimeters (mm). Using similar materials, the 21700 battery has a capacity ratio 35% higher than the classic 18650 cylindrical lithium battery.
Compared to the traditional definition of
18650 battery, 21700 lithium battery has stronger individual specific energy, lower cost of new battery system projects, lighter weight of vehicle battery packs, and is easier to produce intelligently. The latest news about 21700 lithium batteries is that the polymer chemical structure of the battery cover ensures consistency in power off and voltage release, and eliminates three advanced core design concepts for battery safety accidents; The battery shell is made of pre electroplated nickel plated steel plate to avoid the generation of metal material powder and greatly reduce the self discharge of the battery; The quadrupole ear structure achieves ultra-high power discharge and explores higher performance.
Is 21700 lithium battery powerful？
There is no doubt that the market share of new energy vehicles in our country is relatively low, and using sales revenue to alleviate embarrassment is something that everyone can see without saying. In addition, BYD's investment of 245 million yuan to develop salt lake lithium resources last year has already caused quite a stir. Compared to Tesla, the investment is still not large enough.
However, this does not mean that this battery has reached a perfect level, especially in terms of weight reduction, which still needs to be strengthened. Model 3 is divided into four vehicle configurations, namely: 50, 65, 80, and P80D, with the numbers corresponding to the total capacity of the loaded battery. The battery capacity corresponds to different driving ranges (EPA test): 357km, 454km, 550km, and 539km.
In terms of curb weight, they are 1650kg, 1725kg, 1800kg, and 1925kg respectively. As a vehicle with an overall size (4694/1849/1443mm) comparable to the BMW 3 Series (1540~1650kg), it still needs to be quite heavy.
