Musk said at the 2021 Q4 earnings conference that the Model Y equipped with the 4680 battery and CTC integrated chassis may be successfully rolled off the production line in Q1 in 2022, and the superposition of two breakthrough technologies has made many potential consumers start to look forward to it for a long time.
Since the frequent price increases in the price of power battery raw materials in 2021, many car companies have now been unable to hold the pressure and have been forced to raise the terminal price of their new cars. The continuous subsidy deslopement and the rise of raw materials are indeed not a good year for consumers who want to buy new energy models in 2022.
However, when the cost of building a car is forced to rise, and there is not much breakthrough in materials science, optimizing the battery cell and optimizing the power battery structure seems to be the best choice at this stage. Therefore, the CP combination of 4680 battery cell and CTC is indeed optimistic about many people.
Of course, in addition to the price advantage, the combination of the 4680 battery cell and the new combination of CTC will also significantly improve safety, battery life and charging speed, but in addition to many advantages, there is no disadvantage?
advantage
Speaking of batteries, as early as the Tesla Battery Day event in 2020, Musk couldn't wait to show off the 4680 battery. The so-called 4680 battery is a cylinder battery with a diameter of 46 mm and a height of 80 mm.
But it is not just the battery of the big one, according to the book data released by Tesla, the mileage of the 4680 battery has increased by 16%, the power output has increased by 6 times, and the energy has increased by 5 times.
Tesla has explained for the 4680 battery that first of all, for cylindrical batteries, the diameter of 46mm is the best choice that combines high energy density and high power density. That is, the diameter of this battery is the best balance between energy density and power density that Tesla believes.
Secondly, the 4680 battery uses a silicon carbon anode material, which can increase the energy density by more than 8% than the common graphite anode material at this stage, and the physical density can be increased by more than 10%.
In addition to the advantages of energy storage and power density, the new battery has also made significant improvements in safety. At present, the common graphite anode, because its voltage is very close to the deposition potential of lithium ions, in extreme cases, it is easy to let lithium ions accumulate in the outer layer of the negative electrode, which will produce sharp accumulation, reaching a certain level will puncture the diaphragm and cause spontaneous combustion problems.
The anode of the 4680 battery uses a silicon-based anode material, and the new material is not only from a wide range of sources, low cost, but also better safety.
In addition to the growth in structure, materials, etc., Tesla has also created a new technology for the 4680 battery -
Electrodeless ear technology. At present, common batteries mainly use "jelly coil design", which is a positive and negative terminal that rolls the cathode, anode and separator together and connects the cathode ear and the anode ear to the battery container.
The existing design resistance will increase with the increase of the endurance distance, of course, the manufacturing cost will also increase with the increase of the battery cell.
The core of the so-called electrodeless ear technology is to remove the polar ear parts and directly connect the positive and negative collectors with the cover housing, thereby doubling the current conduction area and shortening the current conduction distance. At the same time, the internal resistance of the battery is greatly reduced, the heat generation is reduced, the battery life is extended, and the peak power of charge and discharge is increased.
This is also the core reason for the significant increase in charging speed of models equipped with 4680 batteries.
In addition to the 4680 battery, Tesla has a pioneering technology - the CTC one-piece chassis. Of course, this one-piece chassis structure is well understood, and its core is to place the battery directly inside the body chassis.
Structurally, the connection structure between the traditional power battery and the car body is reduced, and the cost and time are saved from many aspects such as parts, production, and installation.
The data shows that under the use of Tesla body integrated die casting technology and CTC technology, new cars are expected to lose 10% weight, battery life is expected to increase by 14%, and body parts can be reduced by as much as 370.
inferior position
In fact, when it comes to disadvantages, the 4680 battery has not yet been really loaded into mass production. To put it simply, it has not yet been experienced by users, and now the explanation of this battery can only be limited through the data officially released by Tesla, and what is said as for the problem is now in vain.
However, the CTC integrated chassis can still be briefly discussed in advance. The recent hot spot of Tesla is no longer a small and just senior, after all, it has not yet opened, but Tesla's top IP is still relatively easy to climb a hot spot.
Recently, car blogger @De halo love to drive exposed a set of chat records, from the chat content, a Su B license plate Tesla Model Y accidentally hit the wall when reversing, the entire right rear car tail collapsed seriously, tailgate, tail lights, rear wheel arch including triangle windows have been damaged to varying degrees.
Guess what, how much does it cost to repair this Tesla Model Y? Close to 200,000, the owner said, "So expensive, the car is only 28 ah, then this car is not as good as scrapping."
Basically, everyone will feel very shocked, after all, such a maintenance offer has exceeded the scope of ordinary people's cognition. The reason why it is so expensive is mainly because the rear bottom plate of tesla Model Y uses one-piece die-casting technology, and the rear axle structure is damaged and can only be replaced as a whole.
In terms of production, cost, structural safety, control, etc., such an integrated die-casting technology is definitely a lot of advantages, but don't touch the accident, the accident can only be replaced as a whole. It is equivalent to you breaking your foot and changing a leg directly, and the cost will definitely go up at once.
In the same way, the CTC integrated chassis is connected to the battery + chassis, and you must pay attention to all aspects of driving. Otherwise, you may also sigh, can the old owner book a car in advance?