From the recently released data on the overall sales of China's auto market, new energy vehicles continue to show a rapid growth rate. This also shows that new energy vehicles are becoming more and more popular, but in order to gain more consumer recognition, there is a need to further address the biggest pain point of new energy batteries - battery safety issues.
As we all know, new energy vehicles and traditional fuel cars are not the same, the traditional fuel is from the beginning of the smoke, and finally to the spread of the fire, there will not be an explosion in the middle of the situation occurs, and relatively easy to extinguish the flame. And new energy vehicles, is the lithium battery internal oxidation reaction, encountered the air can be a constant source of combustion, can not be extinguished.
In order to deal with the problem of new energy vehicle batteries, many car companies began to work together with many battery manufacturers, the development of "never fire" power battery.
In the battery research process, BYD can be said to be at the forefront. As we all know, BYD's lithium iron phosphate batteries - blade batteries, in the encounter with the pinprick test chamber, neither fire, nor smoke, thus attracting the attention of the majority of people.
In this experiment, BYD's blade battery was 5 mm steel needle penetration test, blade battery was penetrated, is still not smoke nor fire, the surface temperature of the battery reached 30 ~ 60 degrees, from this aspect, BYD's blade battery is undoubtedly a high degree of security.
At present, the battery safety of lithium iron phosphate has been recognized by the majority of consumers, but in terms of ternary lithium batteries, but there are still many problems exist.
In March of this year, GACEA released a power battery technology - magazine battery. In the experimental process, for the first time with 8 mm steel needle puncture, power battery did not catch fire.
In order to continue to prove the controllability of ternary lithium batteries, GAC EA in May this year, and then re-do a 8 mm steel needle puncture experiment, in the process of this experiment, also in line with the national standard, and did not occur the phenomenon of power battery fire.
Great Wall Motor followed suit by launching the "zero thermal runaway" Dayu battery. This battery is able to prevent automotive power batteries from catching fire through two-way current exchange, automatic fire extinguishing, high-temperature insulation, intelligent cooling and other technologies.
Among all these experiments, the pin prick experiment can be said to be the most difficult, his intention is to mimic the phenomenon of short-circuit in the power battery and appeared.
But in fact, no matter what the situation, we can not fundamentally exclude the danger, but only to extend the safe escape time. In real life, the phenomenon of spontaneous combustion is not due to the battery outer casing damage produced, more is the battery suffered a collision, extrusion shell damage, resulting in thermal runaway.