Editor's Introduction: At a time when the penetration rate of new energy vehicles is gradually increasing, the safety of new energy vehicles is attracting more and more attention, and the focus is on battery safety. Not long ago, SAIC-GM, which has turned on the acceleration mode on the electrified track, directly faced the public's hot spots and conducted a series of Aoteneng battery safety performance tests.
According to the latest statistics of the China Automobile Association, the market penetration rate of new energy passenger cars reached 19.5% in November. The Association said that the penetration rate of the domestic retail market for new energy passenger vehicles in November was 20.8%. In recent years, the domestic new energy vehicle market has developed rapidly, and new energy vehicles have gradually been accepted by consumers, at the same time, there are still consumers who have concerns about the safety of new energy vehicles, especially the endless battery accidents.
Especially at the beginning of this month, Guoxuan Hi-Tech and its partners fell into a dispute, which once again aroused the market's high concern about the safety of new energy vehicle batteries.
According to incomplete statistics, in the second half of this year, a total of 21 new energy vehicle fire accidents occurred in China. There are mainly spontaneous combustion during normal driving, spontaneous combustion in standing parking, spontaneous combustion during charging process, and spontaneous combustion in accident collisions. Among them, spontaneous combustion in standing parking accounts for the majority, reaching 42.9%; followed by spontaneous combustion in charging, with a proportion of 23.8%.
Fearless Aotene Battery challenges multiple battery safety performance tests
Not long ago, SAIC-GM released a series of videos of Aoteneng battery safety performance tests to dispel consumer concerns and ensure a good safety pass for the electrification transformation of SAIC-GM. This test simulates a variety of extreme use cases such as collision, extrusion, and needle punching of Aoteneng batteries.
In this test, the battery of Aoteneng electric vehicle platform fell from a height of 2m, the result was no trace of abnormality, and the national standard requirements were dropped from a height of 1m, requiring no electrolyte leakage, no fire, no explosion; in the extrusion test, in the full power state, through the 300kN extrusion, simulating about 30 tons of extrusion weight, the result is that the battery pack does not fire, does not explode, only slight deformation occurs, and the national standard requires 100kN pressure, 10 minutes do not fire and do not explode.
In the acupuncture experiment, in the face of more stringent test conditions than the national standard: the temperature > 45 ° C, SOC > 97%, Aoteneng battery pack is heated, and after puncturing 9mm by the steel needle, the battery cell temperature reaches a higher temperature in a short period of time, and then triggers the core thermal runaway, the relevant system begins to work, the temperature drops to room temperature and tends to be stable, and the final test results show that the Aoteneng battery can face extreme acupuncture test without fire, non-explosion, and no thermal diffusion.
A variety of tests are enough to prove that when Aoteneng batteries face extreme situations, users can avoid secondary injuries caused by battery problems. And the excellent results all come from the excellence of the Aoteneng electric vehicle platform itself.
It is understood that the new battery physical protection architecture strengthened by the Aoteneng electric vehicle platform and the use of a new generation of high-strength battery housing, the anti-extrusion performance of the whole package reaches 3 times the requirements of the national standard, which can effectively protect the safety of batteries and modules in collisions. The torsional stiffness of the whole vehicle with the battery pack is 35kNm· degree, which is at the leading level in the industry. In addition to meeting the requirements of national regulations and C-NCAP, the test of complex working conditions such as bottom ball hitting conditions and rail conditions is increased, so that the safety of battery packs can be taken to a higher level. After the collision occurs, the active discharge can be completed within 5 seconds to ensure the safety of rescue after the accident. In terms of sealing performance, it meets the IP67 dustproof and waterproof and IP6K9K high-pressure water spray protection level.
In terms of anti-heat diffusion, Aoteneng platform has a total of 7 firewalls, including real-time intelligent monitoring system, battery cell spacing hot wall, patented setting for suppressing heat diffusion, anti-tension arc design, rear large-area explosion-proof valve, passenger compartment protection, and module integrated liquid cooling system. It can effectively reduce the heat transfer between the cells, quickly discharge high-temperature gases, and suppress the secondary effects of the thermally runaway batteries on the surrounding area.
In addition, the Aoteneng platform also develops an exclusive battery cell formula for the Chinese market, and the positive electrode adopts nanoscale coating + directional doping of transition metal atoms, which is 10% higher than the 811 basic battery formula common in the industry.
Technical support SAIC-GM's new energy test system is complete
In fact, the excellent performance of Aoteneng's electric vehicle platform is closely related to SAIC-GM's new energy test and verification system, and SAIC-GM's complete new energy test and verification system provides a strong technical support for Aoteneng's electric vehicle platform.
In March 2021, SAIC-GM completed the two "three electric" technology test centers of the Pan-Asia Automotive Technical Center New Energy Test Building and the Guangde Battery Safety Laboratory, covering the main test and verification projects of the core three electric components of new energy models, thus building a complete SAIC-GM new energy test system.
Among them, the new energy laboratory of Pan Asia Automotive Technology Center is built according to the highest standards and process system of the General Motors Laboratory, and the laboratory has a battery vibration test system, a battery performance test system, an electric drive transmission test system, and an electronic control development and test system, which can test the three electric systems of new energy vehicles in an all-round way.
Such as the battery vibration test system, can safely simulate the customer in the actual use of various road conditions may encounter, its test standards far exceed the national standard, vibration time is 3 times the national standard, vibration frequency is 5 times the national standard; and the battery performance test system, can be on the battery pack for various types of instantaneous dynamic working conditions test, verify the power, current, internal resistance and other performance of different battery systems, simulate the use of load in the whole life cycle, restore the actual driving conditions of the battery system.
The perfect three-electric test system makes the Aoteneng platform the strongest at birth in relevant aspects.
In addition, The Guangde Battery Safety Laboratory is completely designed for battery safety, with four independent test areas: performance endurance test room, thermal stability test room, needle punch extrusion test room, short circuit & overcharge and over-discharge test room, thus SAIC-GM has also become the only main engine factory with battery safety development capabilities in the domestic joint venture brand.
The thermal stability laboratory in the four laboratories can meet the thermal stability test needs of various types of cells, and the temperature boundary of various types of cells can be determined under safe test conditions, so as to provide a design basis for the thermal diffusion protection of modules and battery packs, which is also one of the keys to the superior performance of Aoteneng battery packs in the test.
Moreover, it is understood that the Guangde Battery Safety Laboratory has adopted higher standards than the mainstream battery safety laboratory in North America and China from equipment technical defense, safety control to test operation management.
summary:
All in all, the all-round thermal diffusion protection design of the Aoteneng electric vehicle platform, the new generation of high-strength battery housing, and the safer battery safety architecture combined with the whole vehicle have achieved industry leadership in battery safety, which will bring users trustworthy peace of mind.
It is understood that SAIC-GM in the domestic based on the Aoteneng electric vehicle platform to build the first model, Cadillac true luxury pure electric medium and large SUV LYRIQ has opened pre-sale on November 17, and will be listed in the first half of 2022, according to SAIC-GM official said, since the opening of pre-sale in mid-November, LYRIQ has received more than 5,000 orders.
Wang Yongqing, general manager of SAIC-GM, said in the first public appearance of LYRIQ, "From the perspective of delivery time, late is not necessarily a disadvantage, and the new models launched later are very high in the energy level of electrification and intelligent networking, and I am very confident in the Cadillac LYRIQ car." ”
LMC Auto Consulting Zeng Zhiling once told CRRC that among the products laid out by mainstream car companies on the new track, there is Cadillac's LYRIQ, which is currently in line with the era of electric vehicles.