The more terrible thing than encountering a grumpy road rage driver is that the battery of the electric vehicle you are driving suddenly "fires", which is light property damage, affecting travel, and igniting fire and life-threatening.
Although every battery research and development company is trying to solve the problem of spontaneous combustion of batteries due to overheating of batteries, due to the limitations of cost and technology, when different battery packs are subjected to the same "abuse", they can always show different results.
Recently, the car dismantling laboratory disassembled the Aoteneng battery from General Motors, and used a series of experimental means such as impact and fire to verify the stability of the battery, and deeply understood the multiple guarantees made by the Aoteneng battery in thermal management. Experimental results show that under the support of a variety of technologies, the battery safety of Aoteneng can be called a new benchmark in the industry.
Only with strength can it be willful, and high temperature spontaneous combustion does not occur when it is impacted by external forces
In order to confirm whether the Aoteneng battery can maintain a stable working state after being hit by an external force, the dismantling laboratory uses a crane to raise the battery to a height of 5m from the ground, and places a metal cylinder on the ground (the cylinder is a device that simulates the side column impact test of the car), which is to test the collision resistance of the power battery pack itself after the first protection without the sill beam of the car, as well as the stability after the impact.
With a loud bang, the battery pack that fell from a height of 5m collided head-on with a cylinder with a diameter of 25.4cm...
The result of the crash test is that the power battery pack only protects the deformation of the anti-collision beam, and the disassembly shows that the battery pack has not been damaged, and there is no smoke and fire.
This result has a lot to do with the new physical protection architecture used by Aoteneng batteries. Aoteneng battery adopts a shell with high-strength tic-tac-toe structure, using multiple 1500MPA ultra-high-strength steel beams, high-strength steel accounts for about 61%, anti-extrusion performance is 3 times the current national standard requirements, and the reliability is very strong. In the actual use of the car process, in addition to the reliable battery physical protection architecture can bring more powerful security, Aoteneng also has a lot of black technology blessing, today we will focus on a pickpocket of the Aoteneng battery 7 thermal management technology, to see how these technologies show their magic so that the battery does not "fire".
"Real gold is not afraid of fire refining", safety can withstand the test
In addition to the dismantling and collision experiments of the Aoteneng battery in the car dismantling laboratory, previously, the China Automotive Technology and Research Center, a cutting-edge authoritative testing institution in China, also conducted acupuncture experiments on Aoteneng batteries.
In the experiment, the Aoteneng battery was placed in a warm box above 48 °C, far exceeding the test requirements of the national standard greater than 0 °C, simulating the extreme high temperature condition, and then piercing the steel needle into the battery pack for 9 mm, and the penetration of the steel needle caused the temperature of the single battery to rise sharply, triggering the thermal runaway of the battery cell.
During the process, thermal runaway cells occur, and after the temperature reaches a peak for a short period of time, it begins to drop gently until the temperature gradually tends to room temperature. The whole process of acupuncture experiment, starting from the thermal runaway of the battery cell, to the temperature return to the room temperature state, the battery pack state is stable throughout the whole process. After the battery pack was left to stand for 50 minutes, through infrared scanning, it was not found that the battery pack heated up again, and through monitoring, no heat diffusion was found in the battery pack. The excellent thermal diffusion protection ability displayed by Aoteneng batteries has a lot to do with the core technology of 7 heavy thermal management of Aoteneng batteries.
First of all, the cell room and the battery pack cover are used in the aerospace-grade nano material aerogel material, one is used in the battery cell and the cell for heat insulation, when there is a thermal runaway in the cell, can maintain the stability of the surrounding cell temperature, the second is used in the battery cover to further prevent heat diffusion, in order to ensure the safety of the battery pack and the vehicle.
In order to further verify the thermal insulation effect brought by the nano-scale aerospace material aerogel used in the Aoteneng battery, the dismantling laboratory also used a high-temperature spray gun to burn the fireproof insulation material after disassembling the battery, on the one hand, the high-temperature flame of more than 600 ° C, on the other hand, the palm of the experimenter (professional experiment, do not imitate), not only did not catch fire, the high temperature was not transmitted to the other side, which once again confirmed the excellent thermal insulation effect of the aerogel of the nanoscale aerospace material of the Aoteneng battery.
"Take the initiative", black technology brings more powerful battery security
The insulation wall between the batteries and the aerogel fire blanket covered by the whole package can prevent the spread of heat well, but the Aoteneng battery not only uses these 2 "anti-" methods, but also 5 "active" thermal management technologies to monitor, control and solve the thermal runaway problem to further protect the safety of the vehicle and occupants in the event of a risk of loss of control.
In the disassembly experiment of the Aoteneng battery pack, the module of the Aoteneng battery adopts an integrated liquid cooling system with a patented design, compared with the traditional whole package liquid cold plate design, the design of the independent liquid cold plate at the bottom of the module of the Aoteneng battery can increase the heat exchange effect by about 10%, so that the overall temperature of the battery pack will be more stable. Moreover, the integrated liquid cooling system can also control the temperature difference between the cells at about 1 ° C through flow control, which actually has a great advantage, that is, the similar temperature can keep the aging degree of the battery consistent, which can extend the life of the battery.
In the case of thermal runaway battery, Aoteneng battery will take the initiative to carry out rapid exhaust to prevent arc pulling. Taking the acupuncture experiment mentioned above as an example, when the battery is pricked by needle prick and thermal runaway, the temperature will rise rapidly and high temperature gas will be generated inside the battery. At this time, the aerogel insulation wall in blocking the heat diffusion at the same time, the patented design of the fast exhaust channel of the Aoteneng battery pack will cooperate with the liquid cold plate system to quickly discharge high-temperature gas, except, the rear large-area explosion-proof valve of the Aoteneng battery will also be automatically opened, and the rapid exhaust channel will be cooperated to quickly release heat and minimize the impact on other modules and cells.
The rapid discharge of high-temperature gas is the main reason why the battery cell can quickly stabilize after the thermal runaway and ensure the safety of the whole package. In addition to the rapid discharge of high-temperature gases, the internal high-voltage components of the Aoteneng battery pack are also equipped with a design to prevent arcing, avoiding the occurrence of battery arcing at the moment of high temperature. It should be known that the arc is a gas discharge phenomenon, when the current passes through the insulating medium such as air, it will instantly produce sparks, and when the situation is serious, it may lead to a fire explosion, which will pose a threat to the life of the occupants of the vehicle. Therefore, the square arc design of the Aoteneng battery is particularly necessary.
In the case of accidental thermal runaway of the battery cell, these thermal management technologies will help the battery maintain stability and safety, and in the daily normal working state, Aoteneng battery also has a real-time battery health monitoring system, which can achieve high frequency monitoring of 7 (days) * 24 (hours). The monitoring system is a triple sensor of air pressure, temperature and voltage to ensure the correctness of the monitoring information. In addition, once the risk of loss of control is found, the system will take the initiative to take measures to exhaust heat and inhibit the spread of heat at the first time to prevent danger.
With the blessing of these 7 thermal management technologies, the Aoteneng battery can be in a stable working state, even in the event of thermal runaway of the battery, it can also quickly exhaust heat to ensure the stability of the battery package, providing the greatest degree of protection for the whole vehicle and occupants.
Guiyan Hall
For the safety of electric vehicles, in addition to the need for a strong vehicle architecture and rich and practical safe driving technology, the safety of power batteries is also particularly important, after all, in recent years, because of the battery problem accidents have occurred from time to time, to solve this car pain point in order to let consumers rest assured, peace of mind to pay. Through the dismantling, impact and fire experiments carried out by the car dismantling laboratory on Aoteneng, as well as the needle puncture experiments conducted by the China Automotive Technology and Research Center, the practicality and reliability of the seven thermal management technologies of Aoteneng batteries were deeply demonstrated, and the safety of Aoteneng batteries was verified. This also gives consumers more confidence and trust in the Cadillac LYRIQ, the first pure electric SUV born on the Aoteneng platform.
Finally, shout a slogan: there are thousands of roads, and battery safety is the first.