In the traditional fuel vehicle volume and weight of relatively large parts, so in the body structure and materials, it is different from the fuel vehicle. Today, we will take a look at the Model 3 body-in-white exhibited by Tesla for the first time in China to see what different designs electric cars have in terms of passive safety, that is, collision safety.
First of all, let's talk about the results. Tesla Model 3 achieved excellent results in the China Baoyan crash test, with excellent scores in the "25% offset collision", "side collision" and "roof strength test".
From the test pictures released by Zhongbao Research, we can see that in various collision tests, the body frame of Tesla Model 3 plays a good role in energy absorption and protection, leaving enough living space for the occupants in the car. At the same time, the design of the battery pack underneath the electric vehicle also reduces the risk of vehicle rollover.
When you open the Model 3 page of Tesla's official website, you can see that the first page shows the safety design, which shows Tesla's attention to the passive safety of vehicles, and then let's take a look at how it is done.
In terms of body materials, Tesla Model 3 is mainly made of steel and aluminum mixed metal. First of all, we have to say a concept that the harder the car body as a whole, the better. The excellent material will lead to excessive deceleration and acceleration at the moment of the collision, thus causing harm to the passengers in the car. At the same time, harder materials tend to be heavier and have a negative effect on vehicle mileage, which is understood to reduce mileage by 5% for every 10% increase in vehicle weight.
As can be seen from the picture of the body-in-white, the gray part is aluminum, which is mainly responsible for collapsing energy absorption and weight loss; the white part is ordinary steel, the strength is generally less than 500MPa; the blue is high-strength steel, the strength is between 500-800MPa; the red is ultra-high-strength steel, the strength can reach more than 1300MPa, and the consumption of high-strength and ultra-high-strength steel in the whole body-in-white is more than 50%.
The front of the vehicle can have more collapse energy absorption structure because Tesla Model 3 has no parts such as engine and gearbox. Tesla Model 3 in front of the car used a relatively large size of field-shaped aluminum, as much as possible to absorb the forward impact force, but also can play a guiding role in the transmission of force, the rear blue high-strength steel is responsible for dispersing the impact force to the entire body, reducing the local damage caused by the impact force, and then the backward red ultra-high strength steel in addition to continuing to be responsible for energy absorption, but also to ensure the integrity of the crew cabin.
If you think this is a bit abstract, take a look at a very hot topic in collision testing in recent years-positive 25% offset collisions. Take the collision test of Tesla Model 3 in China Insurance Research as an example, in the 25% offset collision in the front, there is less overlap between the vehicle and the obstacle, and the field-shaped energy-absorbing structure in front of the longitudinal beam can not play a good role, so it is necessary to rely on the high-strength steel in the front of the body and the front wing to absorb and differentiate the impact force.
If we say that in the frontal collision, the electric vehicle benefits from its own characteristics and has a relatively abundant energy absorption area, the side collision will undoubtedly be a nightmare for the electric vehicle, in addition to ensuring the safety of the passengers in the car, at present, the weakest battery pack of the electric vehicle will also encounter the most direct impact in the side collision, once it is damaged in the collision, the secondary injury may be more serious.
Tesla Model 3 uses high-strength steel around the chassis frame, and eye-shaped aluminum is used inside the high-strength steel to absorb energy.