GAC Ion released the magazine battery system safety technology, redefining the safety standard of ternary lithium battery
At present, the trend of electrification in the global automobile industry is irreversible. Battery safety is not only an important factor that consumers consider when purchasing electric vehicles, but also a core cornerstone of the healthy and sustainable development of the new energy automobile industry. Since its establishment, GAC Aian has always put the quality of its products in the first place, with a sense of reverence for safety, and is committed to becoming a company trusted by the society.
On March 10th, GAC Ion released a new generation of power battery safety technology-magazine battery system safety technology (referred to as "mag battery"). For the first time in the industry, the whole package of ternary lithium battery can not be fired by acupuncture, which has overcome the recognition. Industry problems, redefine the safety standards for ternary lithium batteries.
(Safety technology of magazine battery system)
Overcome the safety problems of ternary lithium battery and create a "non-fire" battery system safety technology
At present, lithium iron phosphate batteries and ternary lithium batteries are the two mainstream battery technology routes in the global electric vehicle industry. Lithium iron phosphate batteries are widely used in low-to-medium endurance vehicles because of their longer lifespan and lower cost; while ternary lithium batteries are mainly used in mid-to-high endurance vehicles because of their high energy density and low vehicle power consumption. According to the actual use of the current market, the two technical routes of lithium iron phosphate battery and ternary lithium battery will continue to develop in parallel for a long time in the future.
The safety of lithium iron phosphate batteries has been relatively recognized by everyone, but the safety of ternary lithium batteries is still a pain point and difficulty recognized by the industry. Companies related to the new energy vehicle industry chain are also engaged in research on battery safety technology, and "non-fire" battery technology is the most important and most difficult fortress for battery safety.
In order to verify the safety of the magazine battery, Dr. Liu Shiqiang, the chief expert of the China Automotive Technology Research Center and one of the drafters of the national battery safety standard, led the team to acupuncture the whole package of the ternary lithium battery equipped with the magazine battery system safety technology. Thermal diffusion test. The test results showed that the whole package of GAC Aeon’s ternary lithium (magazine battery) only briefly smoked five minutes after the thermal accident signal was issued during the test, and there was no fire or explosion. After standing for 48 hours, the voltage dropped to 0V and the temperature returned to room temperature. After acupuncture, only the thermal runaway of the punctured cell module did not spread to other cells. Open the entire battery pack and observe that the internal structure is intact. This is the first time in the industry to pass the ternary lithium battery acupuncture no-fire test, and the safety of ternary lithium batteries has made a historic breakthrough.
Safety is more than "core", and set a new standard for battery system safety
Nowadays, the consensus of the electric vehicle industry on vehicle safety has shifted from single safety to system safety, and improving the safety performance of the entire battery pack has become the mainstream trend of the industry.
The spontaneous combustion of the current battery is mostly caused by the internal short circuit of the battery cell, which causes the temperature to rise, the heat generated by the internal reaction of the battery cell, and finally thermal runaway, which then spreads to the entire battery pack. Battery safety solves the intrinsic safety of the battery, and the whole package of safety is based on a systematic thinking to solve all-round safety from the battery, the module to the system, which is more important than the safety of the battery, and it is more difficult to achieve.
GAC Aeon’s magazine battery is a systematic technology that specifically improves the safety of power batteries. It is not a pure structural optimization, nor a simple increase in heat insulation, but an improvement from the intrinsic safety of the battery to the enhancement of passive safety. , And then to a complete set of security technologies for software active prevention and control, and it is also an intelligent security technology that integrates software and hardware and has ultra-high defense capabilities.
Based on the design idea of "preventing short circuits in the cells, preventing thermal runaway after short circuits, and preventing heat spread after thermal runaway", the magazine battery adopts a design similar to a safety compartment, which can effectively prevent the spread of out-of-control cells, and when detected When the battery cell voltage or temperature is abnormal, the battery quick cooling system will automatically start to cool the battery.
The magazine battery has four core technologies:
1. Ultra-high heat-resistant and stable batteries. The battery cell can effectively improve thermal stability and prevent thermal runaway through the application of nano-scale coating of cathode material and doping technology; the application of new electrolyte additives realizes the self-repair of SEI film, thereby improving the battery life and reducing the battery life. Risk of core short circuit; high-safety electrolyte, through special electrolyte additives, spontaneously polymerize on the surface of the active material to form a polymer film with high impedance characteristics when heated to above 120°C, which greatly reduces the heat generation of thermal runaway reactions. The application of these key technologies has increased the heat-resistant temperature of the cell by 30%.
2. Super insulated battery safety compartment. Through the meshed nanoporous heat insulation material and the high temperature resistant upper shell, the magazine battery constructs a super heat-insulated safety cabin, and finally realizes that the thermal runaway of the ternary lithium battery does not spread to the adjacent batteries. At the same time, the upper shell of the battery pack can withstand a temperature of more than 1400°C, thereby effectively protecting the entire battery pack.
3. The rapid cooling system for extremely rapid cooling. Through the design of a fully-fitted liquid cooling system, high-speed heat dissipation channels, and high-precision heat conduction paths, the magazine battery has achieved a 40% increase in heat dissipation area and a 30% increase in heat dissipation efficiency, effectively preventing heat spread.
4. The fifth-generation battery management system for full-time control. By adopting the latest generation of vehicle-grade battery management system chip, it can achieve 10 times of all-weather data collection per second, which is 100 times higher than the previous generation system, and monitor the battery status in a 24-hour full-coverage full-time patrol mode. When an abnormality is found, immediately start the battery quick cooling system to cool the battery. The application of full-time patrol mode and abnormal self-rescue redefines the standard of active safety of ternary lithium battery.
Although a large number of safety designs have been added to the magazine battery, it has also been fully optimized in terms of cooling system, battery cell design, and package layout. The battery pack equipped with the safety technology of the magazine battery system has a volume energy density increase of 9.4%, a weight energy density increase of 5.7%, and a cost reduction of 10% compared to similar ordinary battery packs. Therefore, the magazine battery achieves high safety, long battery life, and low cost without sacrificing battery life and increasing costs.
Long-term R&D investment and technology accumulation have created more than 80 invention patents
The reason why GAC Aeon has achieved a major breakthrough in the field of battery safety is mainly due to GAC's long-term resource investment and technology accumulation in electrification technology. As early as 2011, GAC started the research and application of electrification technology, and launched the first domestic medium-to-heavy hybrid model. In terms of electrification technology research, GAC has been researching and developing for more than 10 years, and has formed a large number of technical achievements and talent reserves.
The magazine battery is developed by the GAC Research Institute, GAC Silicon Valley R&D Center, and the world's top battery experts. It is built by an international top R&D team composed of more than 600 people, including more than 60 doctors, which reflects the highest technology of GAC Ian battery safety. Level. GAC conducts research and development in power battery overcurrent protection, battery thermal suppression methods, battery thermal runaway monitoring and early warning, etc., forming an internationally leading patent group, including more than 80 patents, and inventions account for more than 70%. It provides GAC Aian's solutions for the healthy and sustainable development of the new energy automobile industry.
At present, GAC has an industry-leading battery laboratory, professional test field and battery pack production workshop, and has independent battery pack design and manufacturing capabilities. GAC’s self-developed BMS battery management system has undergone continuous iterative optimization and has been upgraded to the fifth generation and applied to the magazine battery technology. At the same time, the AION series of products have more than 100,000 users, generate more than 15 million kilometers of driving mileage every day, bring massive battery operation data, and provide solid data support for the research and development of magazine batteries. System-level battery safety technology has become the unique advantage and strength of GAC Aian.
"Magazine battery" will be installed on all AION models from this year to practice the brand's original intention of mobile travel accompanied by AI.
The release of GAC Ion’s magazine battery system safety technology is a milestone, marking the rise of battery safety to a new level, especially the historic breakthrough in the safety of ternary lithium batteries, which redefines the ternary lithium battery. The new safety standards are of great significance to the development of the global new energy automobile industry. GAC Aian once again brought the "first-in-class enjoyment of science and technology" to customers with world-class innovative technology.