in the nearly ten years since the development of new energy vehicles, ternary lithium batteries have gradually occupied the new energy vehicle market by virtue of their advantages in energy density. However, its poor stability and safety have caused many accidents of spontaneous combustion of new energy vehicles. According to incomplete statistics,, there were as many as 61 spontaneous combustion accidents of new energy vehicles reported in China in 2020 alone.worth mentioning that the reason for the spontaneous combustion of most models is because of the safety problems of the ternary lithium batteries they carry.

from the first half of this year, "no fire, no explosion" has become a hot topic for many new energy vehicle manufacturers to promote the safety of power batteries. These include GAC Aian's "magazine" battery, Dongfeng Lantu's power battery, and Great Wall Motor's latest "Dayu battery".

, in theory,, whether it is traditional fuel vehicles or new energy vehicles, they carry a series of fresh lives, and ensuring the quality and safety of vehicles should be the obligation and responsibility of car companies., the most basic "no fire, no explosion" of the power battery is used as a publicity point to show off. It feels like a car company declaring: "The most powerful thing about our car is that it will neither catch fire nor explode". The feeling that this brings to people is a bit funny.

■mandatory standards are only pass lines

's so-called "no fire, no explosion" actually originated from the mandatory national standards implemented by the Ministry of Industry and Information Technology this year.on January 1, 2021, there is a mandatory express provision that requires the battery system not to catch fire or explode within five minutes after the battery cell is thermally out of control, so as to reserve time for the occupants to escape safely.

need to be explained is that Xiao Lei very much agrees with the "Safety Requirements for Power Batteries for Electric Vehicles" issued by the Ministry of Industry and Information Technology, becauseAt present, most of the accidents caused by spontaneous combustion are caused by the rapid spread of the fire and the failure of the battery system to leave the occupants with escape time in time.

Take the spontaneous combustion accident of new energy vehicles in Jiangsu Province as an example. In 2016, an old man in Jiangsu drove an old-age electric vehicle to pick up his grandson from school. As a result, the vehicle suddenly smoked on the way. The old man wanted to pull his grandson out of the car at the first time, but he couldn't open the door because of a malfunction. However, the fire spread rapidly at this time, and the child never got out of the car again.

if the old scooter at that time could also be equipped with an advanced power battery system, it could prompt the occupants at the first time when the single battery was thermally out of control, and win the precious five-minute escape time for the occupants, then I believe that many casualties caused by the spontaneous combustion of the power battery could be avoided, and the child in Jiangsu could grow up happily a few years ago. Because in ordinary car spontaneous combustion accidents, 5 minutes of escape time is enough.

Xiaolei agrees with the mandatory standard of "no fire and no explosion in five minutes" proposed in the "Safety Requirements for Power Batteries for Electric Vehicles", he does not agree with car companies over touting that their power batteries meet this mandatory standard, because"no fire, no explosion" is a mandatory standard, then it can only be regarded as the passing line of power battery safety at most.

should know that ensuring the safety of products is the basic requirement of every manufacturer, so "no fire, no explosion" should not become the capital for car companies and power battery manufacturers to show off.compared to breaking through this passing line, car companies should have higher requirements for products, such as how to eradicate the thermal runaway of the single battery that caused the power battery to catch fire and explode.

■can't cure spontaneous combustion

There are currently two mainstream automotive power batteries on the market, one is lithium iron phosphate batteries, and the other is ternary lithium batteries. Since lithium iron phosphate batteries have inherent advantages in battery safety, in fact, cars caused by thermal runaway of lithium iron phosphate batteries are indeed quite rare. Therefore, Xiao Lei believes that the mandatory standard of "no fire and no explosion within 5 minutes" issued by the Ministry of Industry and Information Technology is more It is formulated for ternary lithium batteries with larger market holdings and relatively low safety.

From now on,the so-called "no fire or explosion within 5 minutes" is only an expedient measure before the safety problem of ternary lithium batteries is solved.when can the 5-minute precondition be removed, the battery safety problem of new energy vehicles can be cured.

However, in Xiao Lei's view, although the major battery manufacturers that currently use ternary lithium batteries and can achieve "no fire, no explosion" are full of propaganda skills,in fact, they still do not solve the problem fundamentally, because most of them adopt the passive strategy of "mending the situation after losing the sheep.

, whether it is the "magazine" battery of GAC Eian, the power battery of Dongfeng Lantu or the "Dayu battery" of the Great Wall, they are all "sentinels" who choose to install inside the power battery to monitor the internal conditions of the power battery, and "firefighters" who are used to extinguish the fire after the sentinels find an emergency. They have not eradicated the root cause of spontaneous combustion of the power battery-single battery.

■summary

it is undeniable that as the core component of pure electric vehicles, the safety of ternary lithium batteries has made great progress after more than ten years of development,the car carries people's lives, safety is not a joke, so Xiao Lei believes that safety is only better, not the best.