News (reporter Cui Xiaosu) on March 10, GAC AIAN released a new generation of power battery safety technology — magazine battery system safety technology (referred to as “magazine battery”), the industry for the first time to achieve three lithium battery pack without fire needling. The test results show that the whole pack of GAC E ‘an ternary lithium (magazine battery) in the test process of 5 minutes after the thermal accident signal sent out, only a brief smoke, no fire and explosion phenomenon. After standing for 48 hours, the voltage drops to 0V and the temperature returns to room temperature. After acupuncture, only the pierced cell module was out of control of heat and did not spread to other cells. Open the whole battery pack and observe that the internal structure is intact. This is the first time that the whole pack of ternary lithium battery has been needled without fire test in the industry, and the safety of ternary lithium battery has made a historic breakthrough.
Gac said Mr Abe, the gac Mr Abe’s battery magazine is a special boost power battery safety systemic technology, it is not a pure structure optimization, increase heat insulation is not simple, but from batteries intrinsic safety promotion, to passive safety reinforcement, active prevention and control of a set of security technology, software and a hardware and software integration, ultra defensive ability of intelligent security technology.
Based on “prevent short circuit batteries, after a short circuit, to prevent thermal runaway and prevent heat spreading after thermal runaway” design concept, magazine battery USES the design of similar security module, which can effectively block the spread of the thermal runaway batteries, when batteries are detected voltage or temperature anomalies, such as automatic start battery rapid cooling cooling system to cool the battery.
The magazine battery has four core technologies, one is the ultra-high heat resistant and stable cell. The nanoscale coating of cathode materials and the application of doping technology can effectively improve thermal stability and prevent thermal runaway; The application of new electrolyte additives realizes the self-repair of SEI film, thus improving the life of the cell and reducing the risk of short circuit. High safety electrolyte, through special electrolyte additives, when heated to more than 120℃, spontaneously polymerize on the surface of the active material to form a polymer film with high impedance characteristics, greatly reducing the heat generation of thermal runaway reaction. The application of these key technologies makes the heat resistant temperature of the cell increased by 30%.
The second is a battery safety cabin with super heat insulation. Through the mesh nano-hole insulation material and the high-temperature resistant upper shell, the magazine battery builds a super-strong insulation safety cabin, and finally realizes the thermal runaway of ternary lithium cell without spreading to neighboring cells. At the same time, the battery package housing can withstand temperature above 1400℃, so as to effectively protect the whole battery package.
The third is the rapid cooling system of extreme speed cooling. Through the design of fully fitting liquid cooling system, high-speed heat dissipation channel and high-precision heat conduction path, the magazine battery achieves a 40% increase in heat dissipation area and 30% increase in heat dissipation efficiency, effectively preventing heat spread.
The fourth is the fifth generation battery management system with full time control. By adopting the latest generation of battery management system chip of car standard, it can realize all-weather data acquisition 10 times per second, which is 100 times higher than the previous generation system. It can monitor the battery state with 24-hour full-coverage and full-time patrol mode. When abnormal, immediately start the battery cooling system to cool the battery. Full-time patrol mode and the application of abnormal self-rescue redefine the active safety standard of ternary lithium battery.
It is understood that the magazine battery has been comprehensively optimized in terms of cooling system, battery cell design and whole package layout. Compared with similar common battery packs, the battery pack equipped with magazine battery system safety technology increases the energy density by 9.4% by volume, 5.7% by weight and 10% by cost. Therefore, the magazine battery achieves high safety, long endurance and low cost without sacrificing range and increasing cost.