At present, the development momentum of new energy vehicles is rapid, and at this stage, battery safety technology has become a technical barrier that major car companies cannot bypass. "Thousands of roads, safety first", for family cars, driving safety is related to the happiness of each family, safety is 1, intelligence, power, design, etc. is 0, once 1 is gone, then no matter how much 0 is only "no rice cooking". More and more accident cases prove that the top priority of the safety of new energy vehicles lies in the battery pack, and the car company has made heavy protection for it, but the bottom of the vehicle with the battery pack "separated by a wall" has become a neglected weak link.
Safety is the "bottom line" of geometric cars
In the process of moving towards the era of electrification, we often hear about spontaneous combustion accidents of new energy vehicles, some spontaneous combustion when stopping, some spontaneous combustion after collision, and some spontaneous combustion during driving. According to incomplete statistics, in 2020, there were a total of 72 spontaneous combustion accidents of new energy vehicles reported by the mainland media, most of which were related to short circuits in power batteries, of which "mechanical trigger" was one of the main reasons for internal short circuits.
The term "mechanical trigger" is another word, that is, an external object impact. Although with the development of new energy vehicles, Volkswagen's MEB platform and GM's Ultium platform have all put on layers of "armor" for power battery packs. However, in the conventional crash test, the impact is often carried out from the three links of "frontal collision", "side collision" and "back collision", and ignores the "bottom collision" link, which will obviously become a major safety hazard.
As the saying goes, "often walk by the river, where there are not wet shoes", the probability of these battery packs "lying guns" on the bottom of the car is not small, and there are many cases of accidents at the bottom of the car being scratched and impacted. According to the authoritative research data of China's road traffic accidents, hitting low obstacles, scraping the bottom road surface, and lifting obstacles are the main factors causing damage to the bottom of the car. The mechanical damage to the bottom accumulated in this process has become the "fuse" for the spontaneous combustion of new energy vehicles. So you see, in addition to the front, side, and back, it is also particularly important to do a good job of "bottoming out".
Zhiwei Zhao, Ph.D., University of Science and Technology of China,
Expert of the Standardization Technical Committee of the Heavy Truck Replacement Alliance,
He presided over the drafting of a number of evaluation procedures and standards such as the evaluation of the impact resistance of passenger car bottoms and the "frontrunner" of power batteries
At the end of 2021, the Society of Automotive Engineers of China issued the industry standard T/CSAE 244-2021 "Requirements and Test Methods for The Bottom Of Pure Electric Passenger Cars", which is the world's first standard to measure the bottom protection performance of pure electric passenger cars, and the highest certification level is A level. As a standard drafting unit, China Automobile Research Institute has become the only authoritative institution in China with the certification qualification of "pure electric passenger car bottom collision protection".
As a user-centric car brand, Geometry Auto has taken the lead and become the first car company to officially participate in the "bottom collision protection test". It is not easy to pass this test, in addition to the bottom protection tests in the 30km/h straight and 5km/h reversing scenarios, it is also necessary to conduct a 30-minute battery pack soaking waterproof test after the bottom collision to complete the test of its airtightness and IPx7 waterproof ability. A series of operations basically cover the driving situation of the whole scene of "whole vehicle scraping bottom" and "whole vehicle bottom" under extreme weather.
After undergoing various rigorous tests, Geometric Auto delivered a satisfactory answer. On March 24, the upcoming Geometric E achieved a Class A crash score in the "Bottom Collision Protection Test" of the China Automobile Research Institute, becoming the "No. 001 Player" in the industry who passed the pure electric passenger car bottom protection certification, setting a new benchmark for the safety protection of pure electric passenger cars.
Hardcore technology for safety
Safety is the "bottom line" of geometric cars. Behind such an admirable prevention and control record is the ultimate pursuit of safety in geometric cars. In order to create a "firewall" for the battery pack at the bottom of the vehicle, the geometric car has carried out one-on-one "hard" core blessing in the three links of foundation, structure and materials, and heavy protection to do a good job of "bottoming out" for vehicle safety.
Foundation "hard": Geely 4.0 Super Smart Factory
Geometry E will be born from the Geely 4.0 Smart Factory, and the advanced production process provides Geometry E with a high-quality foundation to create a 'firewall'. At the same time, with the 4.0 intelligent empowerment concept that integrates digitalization, automation, intelligence and flexibility, Geometry E has also realized the "four mores": not only will it have a safer body structure, but also a more powerful and durable power, a more textured design, and a more intelligent human-vehicle interaction. With the blessing of the 4.0 smart factory, Geometry E has become an all-round three-good student who is "not biased".
Structural "hard": four high-intensity lines of defense
After laying a good foundation, Geometry E began to design the structure of the "firewall", generally speaking, the firewall only has two lines of defense, high-strength lower shell and coating, but Geometric E does not think so, security redundancy must be done, so Geometry E has four lines of defense:
1. In order to resist the external impact on the battery pack, the battery pack needs to design a "lower shell";
2, in order to prevent the shell from being corroded, the outside needs to have a thick layer of "spraying";
3. In order to cope with the frequent bottom scraping and impact cushioning, the front half of the entire bottom is designed with a hard but resilient "bottom armor";
4. On the body longitudinal beam, the bottom of the battery pack "protective beam" must be installed, and the ground height of the anti-collision beam should be the lowest, so as to prevent the bottom from hitting the battery pack and slow down the damage to the battery pack.
The four lines of defense, from the inside to the outside, are interlocked, together forming a "firewall" for the vehicle's "bottom", and the last step is to match them with the materials that meet the conditions to maximize the effectiveness of the protection.
Material "hard": maximum protective effect
The structure of the "firewall" is exquisite, the materials must be more exquisite, and how to use various good materials on the "blade" is also a science. In order to gain the upper hand in various collision confrontations, the strength of the material must be improved. Geometry E can be described as "stacking" in the construction of a "firewall":
1. The lower shell of the battery pack adopts "high-strength steel";
2. The surface armor of the lower shell adopts a "special coating";
3. The bottom armor of the front of the bottom of the vehicle is made of "composite material" with a thickness of 2.0mm;
4. The anti-collision beam at the bottom of the battery pack uses a "special steel" with a diameter of 25mm.
A variety of materials perform their duties, so that the "firewall" takes into account the characteristics of light weight, corrosion resistance and high hardness. He not only defends against the impact and scratching of the stones from the bottom, but also effectively slows down the deformation of the bottom impact on the battery pack shell when facing a violent bottom impact, strengthens the bottom of the car, reduces the fire risk caused by the thermal runaway after the bottom, and practices the guardian promise of the geometric car.
Bang reviews
Nowadays, with the increase of second-child families and the diversification of car roles, people are spending more and more time with cars, and vehicles are slowly becoming people's "mobile castles". For users, choosing a new energy vehicle to become a new member of their own family, safety is the first point to be included in the investigation. Relying on the geometric vehicle of Geely's new energy system, safety is always regarded as the "bottom line" to escort people's "mobile castle" travel.
This crash protection test is a deep confirmation of the quality of geometric brands on their own products, which also means that new energy vehicles will bid farewell to the traditional evaluation of "three strong (front, side, back) and one weak (bottom)". It can be seen that the geometric E positioning of "Youth Boutique Pure Electric SUV" has also achieved the top level of the same level in terms of safety, and interpreted the product concept of "safety irrelevant price point" with practical actions. Regarding the performance of this new car in other aspects, we will bring you a review experience as soon as the new car is launched, so stay tuned
Note: The appearance of the vehicle is subject to the actual model on sale