In March, 22,
BYD blade battery with safety as its biggest selling point went on the market, and at the press conference, the pictures of the comparison between blade battery and its competitors' acupuncture experiments were released. The experimental results showed that BYD blade battery completely beat the ternary lithium battery and lithium ferric sulfate block battery compared with it.
On May 21st, 22,
The fuse appeared, and a blogger named @ Xiaoyu Lithium Battery in Weibo released his video of acupuncture experiment on Contemporary Amperex Technology Co., Limited 811 ternary battery. From the experimental video, it was found that the battery was obviously on fire after being punctured by steel needle.
On May 22, 22,
Contemporary Amperex Technology Co., Limited official Weibo published a Weibo, which read: "What prevented Contemporary Amperex Technology Co., Limited from doing acupuncture experiments? Is it technology? Is it a system? Is it the face of a giant? No, it is a steel needle! " At the same time, a video of Contemporary Amperex Technology Co., Limited ternary battery pack acupuncture experiment was attached. From the video, the steel needle used in the experiment was broken because it could not pierce the battery pack.
On May 23rd, 22,
Contemporary Amperex Technology Co., Limited official Weibo released the Weibo, which read: "Contemporary Amperex Technology Co., Limited had mastered the hormone of ternary battery through acupuncture experiment as early as 217, but why didn't it be popularized? Pass the acupuncture test = battery safety? "
On May 24th, 22,
Li Yunfei, BYD's vice president of sales, released Weibo. His Weibo core view is that the experiment of short-circuit caused by the needle not piercing the battery pack has failed, and the purpose of acupuncture experiment is to short-circuit the battery to observe the thermal runaway of the battery.
On May 25th, 22,
A Contemporary Amperex Technology Co., Limited engineer named David engineering male in Weibo released Weibo, saying that there were technical loopholes in Li Yunfei's views and mocking a wave of Li Yunfei.
After the incident, some investors asked Chairman Contemporary Amperex Technology Co., Limited questions, including the question of battery safety testing. Chairman Contemporary Amperex Technology Co., Limited said: "The safety of batteries and the abuse testing of batteries are two different things, and some people equate the passing of abuse testing with the safety of batteries." It was this screenshot that triggered the craze on the Internet.
I'm sure everyone has got the message here. Generally speaking, people on the Internet think that BYD thinks Contemporary Amperex Technology Co., Limited's acupuncture experiment is a failure, and Contemporary Amperex Technology Co., Limited thinks that BYD's abuse experiment proves its battery safety. Not only that, but also several questions can be drawn from the above timeline:
1. Can the experiment in Contemporary Amperex Technology Co., Limited's video successfully prove that its battery pack passed the acupuncture experiment?
2. Does passing the acupuncture test mean that the battery is safe?
3. What are the safety standards for power batteries besides acupuncture?
4. Did Chairman Contemporary Amperex Technology Co., Limited really say that BYD abused the experiment?
I'm sure you've read too many articles criticizing one side of this incident, so Xiao Bai will take you to understand this incident from three aspects around these four issues.
what is acupuncture experiment?
From the paper "Research Progress of Safety Solutions for Power Batteries" by Liu Guandong, we can see that the acupuncture experiment belongs to mechanical abuse of power batteries from the place marked by the red line, so what Chairman Contemporary Amperex Technology Co., Limited said is not the "BYD abuse experiment" as everyone understands, but refers to the mechanical abuse experiment of batteries, which is somewhat misinterpreted.
what is the acupuncture experiment? Looking at the places marked in pink, the same characteristics of mechanical abuse, electrical abuse and thermal abuse are that the thermal runaway of the battery is caused first, and thermal runaway means that the battery temperature rises sharply, which eventually leads to overheating, fire and explosion of the battery.
Therefore, Vice President BYD's view is not completely wrong. Did Contemporary Amperex Technology Co., Limited's acupuncture experiment fail?
It is also from the same paper. Judging from the passage marked with chalk lines, the safety test of power battery requires that the structural design from monomer to battery system is safe and stable, so Contemporary Amperex Technology Co., Limited's acupuncture experiment cannot be said to be a failure.
Although the experiment can't be defined as a failure, Contemporary Amperex Technology Co., Limited didn't try to puncture the battery pack again with a steel needle. Is this behavior a little evasive and distracting?
what are the safety standards for power batteries?
is acupuncture the only safety standard for battery packs? This problem can be seen in the GB3381-22 "Safety Requirements for Power Batteries for Electric Vehicles" published by the state. Now Xiaobai will sort out the safety requirements for everyone.
from the safety requirements of xiaobai finishing, we can see that there is no acupuncture experiment, so we can understand acupuncture experiment as an additional question in the exam, and we can't take "passing acupuncture experiment = battery safety" as a true proposition.
what should we do about this incident?
In fact, this question is the reason why Xiao Bai wants to write this article.
From the ranking of global power battery shipments in 219, we can see that Contemporary Amperex Technology Co., Limited and BYD are not only the first and second brothers in China, but also among the best in the world. The original intention of this experiment made by @ Xiaoyu Lithium Battery should be to sound an alarm for domestic manufacturers. It is time to pay attention to whether your battery is safe.
But in fact, when this incident was put on the Internet, it became like a stalking fan fight. It is not difficult to see these remarks under the above-mentioned Weibo articles.
Xiao Bai doesn't know whether it's the water army brushing public opinion or whether there really is brain powder. What we should do now is not to urge Contemporary Amperex Technology Co., Limited to do another experiment to prove his innocence? Can you still feel superior with power batteries? Should I despise using 555 if I use Nanfu?
With the coming of summer, the spontaneous combustion of electric vehicles has begun to appear gradually, not only because of the high temperature, but also because of the rain and water accumulation in the southern region, which is also a big test for the safety of electric vehicle batteries.
the spontaneous combustion of electric vehicles is not only the owner's business, but also affects everyone's life safety every minute. No one can be immune to it.
The internal combustion engine has been developed for hundreds of years, and the electric vehicle is a new variety, so the technology of power battery and its safety standard are certainly not as mature as the gasoline version.
Xiao Bai thinks this is an opportunity for everyone to focus on the safety of the power battery, not the humble sense of superiority.
going back to the topic of this article, who did this steel needle really hurt? It may only hurt consumers.
This article comes from the author of Chejia, car home, and does not represent car home's standpoint.