A domestic new energy vehicle caught fire after a collision. Experts: Don’t think everything will be fine if you use lithium iron phosphate.
A few days ago, a domestic automotive media released a video of a collision experiment. It is reported that the two vehicles collided at a speed of 64km/h with a 50% overlap to simulate the safety performance of the entire vehicle under extremely dangerous conditions.
According to the video, the Han EV equipped with BYD's lithium iron phosphate blade battery caught fire after being left standing for 48 hours. The fire department determined that it was caused by a fault in the battery's electrical circuit.
The blade battery caught fire and exploded. This really poked everyone's nerves, because in the past, BYD head Wang Chuanfu once said: "The advent of the blade battery means that the word "combustion" must be completely changed from the word "combustion" in new energy vehicles. Cross out " in the dictionary.
As we all know, the so-called blade battery is essentially a lithium iron phosphate battery. Theoretically, lithium iron phosphate batteries have the inherent advantage of stable chemical properties. They will basically decompose and burn at 700-800 degrees Celsius, while ternary lithium batteries will decompose at less than 300 degrees Celsius.
BYD's innovation is to abandon the traditional battery packaging idea, and through structural innovation, skip "modules" when batteries are grouped, and the battery volume utilization rate is increased by more than 50%.
But this comes at a price. Under severe collision conditions, the battery body cannot be touched, let alone subject to force, based on the original design concept of the module. However, we put more batteries into it. In the battery pack, reducing or eliminating the strength of the beam gives way to the battery, which means that the battery is more susceptible to damage under extreme collisions.
Of course, the Han EV did not catch fire or explode immediately after the accident, which ensured the driver’s escape time. However, a fire broke out after it had been left standing for 48 hours. The cause of the vehicle fire cannot be determined for the time being, nor can it be directly explained. Blade batteries are not safe. But in any case, this can be regarded as one of the situations where a real accident occurred, and the problems behind it need to be paid attention to.
Therefore, Ji Andun reminds that if you encounter a vehicle that will collide in the future, abandon the vehicle as soon as possible and let professional 4S shop personnel conduct inspections to confirm whether there is a change in the insulation resistance of the vehicle and the voltage of the battery. Is there any change?
In fact, new energy vehicle fire protection is ultimately inseparable from the assembly of special fire extinguishing devices to "insure" new energy vehicles. The latest "Safety Requirements for Power Batteries for Electric Vehicles" issued by relevant ministries and commissions requires that after the thermal runaway of a battery cell occurs, the battery system will not catch fire or explode within 5 minutes, allowing safe escape time for the occupants. Therefore, the core pain point of safety not only stimulates many car companies to research safer batteries, but car fire extinguishing devices are also becoming more important to car companies.
Zhang Junfeng, chief engineer of He Andun R&D, said that He Andun, with the corporate philosophy of "living up to every trust", has successfully developed an automatic fire extinguishing device specifically for new energy vehicle lithium battery boxes, solving the problem of relying on Traditional fire extinguishing agents and fire extinguishing principles cannot effectively extinguish the problem of initial explosion of power lithium batteries. Among them, fire prevention and control products such as special automatic fire extinguishing devices for battery boxes and fixed fire extinguishing systems for passenger compartments are used in new energy vehicles.
The basic principle of this safety technology is that when a fire occurs, the Andun Fire Hot Aerosol Automatic Fire Extinguishing Device triggers the action of the fire-extinguishing agent through electric start or temperature start, quickly producing a large amount of sub-nanometer solids. The mixture of phase particles and inert gas acts on every corner of the fire in a three-dimensional and fully submerged manner in the form of high-concentration smoke. Through the multiple functions of chemical suppression, physical cooling, and dilution of oxygen, it extinguishes fires quickly and efficiently, and is non-toxic to the environment and personnel.
According to relevant industry insiders, "He Andun lithium electrosol fire extinguishing device technology is not actually a new fire extinguishing technology, but a safety technology specially designed for new energy vehicles." In his It seems that "this new technology is simple and easy to implement and can effectively prevent fire and explosion accidents caused by battery thermal runaway.
And Andun new energy vehicle aerosol automatic fire extinguishing device has taken the lead in urban bus systems Pilot application, as a new generation of fire extinguishing equipment, it is installed in various new energy bus series models. It is worth noting that He Andun has more than 160 patents in small space gas fire extinguishing research, and is the leading brand in domestic new energy transportation and power grids. One of the major brands and high-quality suppliers of aerosol automatic fire extinguishing systems in the industry. It can be used in special automatic fire extinguishing scenarios such as power replacement cabinets, charging cabinets, distribution cabinets, new energy battery boxes, new energy battery compartments, and new energy engine compartments. products, and provides intelligent fire protection services to government and enterprise units such as Huawei, China Tower, and State Grid.