At 1 o'clock in the morning on November 4, a Tesla Model S traveled to a corner in Indianapolis, USA, and lost control to crash into a big tree, causing the driver and passengers to die. . According to eyewitnesses, the vehicle was very fast before it hit the obstacle and the vehicle fired. The speed is too fast should be the cause of the accident. Tesla denied that the accident was related to the Autopilot. The road conditions were limited, and the speed would be limited. It would not be so fast and a car accident would occur.
According to Indianapolis local media "Indianapolis Star", the accident Model S violently hit the roadside trees, the body debris splashed 150 yards (about 137 meters), while the vehicle began to catch fire and quickly spread to the entire body .
As of now, this is the fourth fire accident that Tesla has had this year. In September this year, in Gratkorn, Austria, a Tesla Model S owner rushed into a construction section on a freeway section, and the vehicle caught fire, but fortunately the owner was not injured. In the other two Tesla fire accidents, the vehicles were not bumped. One accident occurred in Norway, the accident vehicle spontaneously ignited when charging with a super-charged pile, and the other occurred in Biarritz, France. The Model S 90D caught fire unexpectedly during the test drive.
Among them, in response to this "fire" accident in France, Tesla announced the results of the accident investigation, which indicated that the fire was caused by the manual installation of the connecting device of the electric system. Usually, the assembly work of this part should be The machine is done.
Tesla's internal battery adopts a single stand-up solution, and in order to enhance the safety of the model, Tesla added the design of the underbody titanium alloy cover for the Model S in 2014 to protect the bottom panel. .
It is understood that Tesla's internal battery pack consists of nearly 7,000 18650 lithium batteries. Under normal circumstances, the electrolyte contained in the lithium battery is sealed and will not react. However, when the outer casing of the lithium battery is broken and the electrolyte inside is exposed to air or water, it is dangerous.
Tesla's battery uses 18650 battery, a rechargeable battery that is slightly larger than the commonly used No. 5 dry battery. The battery core of the notebook is mostly used, but Tesla uses the 18650 produced by Panasonic. The battery is also the only 18650 battery in the world that can be used in electric vehicles.
I want to use a battery with a size of 18650 on an electric car, and I have to run a long distance. Needless to say, I need a lot of 18650 batteries. According to online information, the Tesla Model S 85 seems to use 7104. How to integrate so many batteries together? It is necessary to stand up one by one. If it is bundled and installed, the heat generated by the battery in the middle part cannot be dissipated during charging and discharging. This will affect the performance of the battery unit, the most important one. When it becomes a bomb, the heat of the battery will not explode and it will explode. Therefore, Tesla adopted the current battery cell stand-up solution, so it is necessary to add a cooling system inside the battery module to prevent the middle part of the battery from being too hot. This dense battery is a very good thing to integrate together, and the positive and negative poles of each battery are soldered with fuses, in order to prevent abnormal battery discharge, plus battery management system, cooling system, and try to Keep the temperature of each battery unit as consistent as possible, try to keep the loop resistance of each battery close, ensure the discharge degree of each battery unit is synchronized, and so on. It is also very powerful to think about this Tesla.
The advantage of this kind of scheme is that the car has a low center of gravity, and the car should be relatively stable when it is opened. This kind of scheme also has risks. The car is afraid of bottoming out and is afraid of a collision with a relatively low position. Tesla's official data shows that the Model S's ground clearance is 152mm, and the thickness of the battery module is about sixty millimeters. That is to say, as long as Tesla's collision position is 220mm above the ground, it will not hurt the battery module. At present, most of the car's anti-collision beams should be more than 220mm away from the ground. This is the reason for the layout of the Tesla. This layout certainly does not hurt the battery module during the crash test, which is why the score obtained for the crash test of the Tesla is not low.
Since there is no big problem with this battery layout, why do you often see reports that Tesla has a car accident and then caught fire?
The analysis believes that the impact of the chassis from the bottom and the uncontrollable sweep of the vehicle hitting a large tree or pole should be the main reason. In both cases, the battery module will be damaged, and if more than 7,000 batteries are damaged, Shifted, the short circuit is affirmative, the battery short circuit will be on fire in nine out of ten, this is not what Tesla is willing to see, and they can't prevent it. If such an accident occurs, a fuel car or other electric vehicle in which the battery is arranged may also be ignited. (Comprehensive finishing)
At present, the new energy vehicles in China are also exploding. Recently, the China Automotive Engineering Society released the "Technology Roadmap for Energy Saving and New Energy Vehicles": In 2020, the sales volume of new energy vehicles in China needs to exceed 7% of total vehicle sales. More than 15% in 2025 and more than 40% in 2030. Faced with such a large market opportunity, some people believe that a large part of the technical bottleneck in the development of new energy vehicles exists in the battery. The problem of battery technology can be solved any day, and not only the electric car market, but the whole world will be completely new.
If you want to know more about the opportunities and technical challenges facing the new energy vehicle market, you are welcome to pay attention to the Smart Car Sub-Forum of the 2016 China IoT Conference hosted by Huaqiang Jufeng's Electronic Enthusiasts Network ( free registration ). At that time, Tian Feng, vice president of ZTE New Energy Vehicles, and other industry experts will bring you a wonderful speech on the future development of new energy vehicles.
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