Chapter 982 What are you afraid of?

CC's new product launch conference just ended one hour ago, and a video about a lithium battery that exploded when punctured and could not be extinguished by a fire extinguisher directly became a hot search on Liumeng's Weibo.

But the strange thing is that two news about Zhonghuajia, the target of CC's covert attack, also became a hot search, and they were right below the video of CC's product launch conference.

"Is the electric car that Zhonghuajia is about to launch a mobile bomb?"

"Visiting the current situation of Zhonghuajia's pure electric taxis, whether there is spontaneous combustion!"

Many curious people clicked in and found that the first one was text data, which was counted by a certain car blogger through various channels. So far, there have been no cases of spontaneous combustion in the thousands of pure electric taxis and electric buses that have been launched.

For the data of this car blogger, most people are just watching the fun, because it is related to life safety, and it is impossible to believe it so lightly.

However, when clicking on a hot search below, it was found that it was a video, and it was a spliced ​​video released on Weibo and Toutiao at the same time.

A tourist who was traveling to Jingjiang took a taxi and got a pure electric taxi from Zhonghuajia, and then had a conversation with the driver.

Tourist: "Master, what kind of car is this? Why haven't we seen such a beautiful taxi over there?"

Driver: "This is Zhonghuajia's electric taxi, which is produced in Jingjiang. It should not be popularized outside the province, right?"

Tourist: "Master, I just watched CC's product launch conference. They said that the power lithium battery of pure electric taxis is prone to spontaneous combustion. Aren't you afraid?"

The video clearly shows the confusion and puzzlement on the taxi driver's face, and then he understood what was going on after the tourist's explanation.

The driver said: "It's so powerful that even a fire extinguisher can't put it out? I hope I can't touch it."

Tourist: "Master, now that you know, aren't you afraid?"

The driver laughed and said:

"What's there to be afraid of? Compared to these, I am more afraid of being poor.

At least after I started a pure electric taxi, the fuel cost has been reduced several times, I earn more, and I can give my family a better life.

Besides, look at my odometer, I have driven more than 70,000 kilometers in half a year, and I have saved more than 25,000 yuan in fuel costs.

None of the taxis of Zhonghua in Jingjiang City has spontaneously caught fire, and mine has run more than 70,000 kilometers without any problems.

We ordinary people don't know about the technical things, but this car of Zhonghua has indeed made me earn more money.

Besides, Zhonghua is such a big company, there must be an avoidance plan..."

The video also randomly interviewed several passengers, and they all said that they had nothing to worry about, and they were proud that Jingjiang City had a car factory of Zhonghua.

This video, combined with the previous data copy, directly turned the one-sided discussion at the beginning into a controversial discussion.

However, one side was still half-believing and half-doubting, and was still unwilling to put their lives in such an unknown danger.

The other side felt that spontaneous combustion was a matter of probability. After all, as one of the top high-tech companies in China, the flower-growing family, which has always had a good reputation, must have known this shortcoming, but still launched it, which means that they have the technology to avoid risks.

Less than 3 hours before the CC product launch conference, when netizens were still insisting on their own opinions, Chen Changliu, the soul of the flower-growing family and an idol regarded by many young people in China, uploaded a 10-minute video on the official website, Toutiao and Liumeng Weibo.

In the video, Chen Changliu did not respond in the office, but in a laboratory.

Chen Changliu, wearing a white coat, smiled at the camera and said:

"Hello everyone, I am Chen Changliu, I am now in the company's power lithium battery research center. I just received a report that a fuel vehicle company actually played a power lithium battery needle puncture experiment video that has nothing to do with fuel vehicles at the product launch conference.

How should I put it? I just felt that this is a kind of sadness after watching it just now. I want to ask: What are you afraid of?"

When he said this, Chen Changliu's face did not have that kind of aggressive expression, but a half-smile expression, which looked like a joke.

"However, seeing so many people worry about the safety of power lithium batteries, I need to do some popular science here.

Power lithium batteries do have the risk of spontaneous combustion. Anyone with a little knowledge of physics knows the reason why lithium batteries spontaneously combust.

That is, the more active the element of the material, the more likely it is to have thermal runaway, because if the temperature is slightly higher, leakage and short circuit of the positive and negative electrodes will occur, leading to fire and combustion.

But some car companies did not tell you that the current power lithium batteries should be strictly divided into two types, one is lithium iron phosphate battery, and the other is ternary lithium battery.

The biggest problem of power lithium batteries is the spontaneous combustion and deflagration after thermal runaway. The different spontaneous combustion points lead to different safety properties, and ternary lithium batteries are more prone to deflagration than lithium iron phosphate batteries.

Because the positive electrode materials of ternary lithium batteries contain active elements nickel and cobalt, their chemical properties are more active, high temperature performance is unstable, and the internal limit temperature is generally around 200 degrees Celsius.

Lithium iron phosphate batteries do not have this. The elements iron and manganese in lithium iron phosphate batteries make them more stable, and the internal limit temperature can reach around 800 degrees Celsius.

So the battery in the whole video is a ternary lithium battery, because it exploded within just one minute, and our flower grower uses a lithium iron phosphate battery. "

In the video, Chen Changliu explained while pointing to two semi-finished power lithium battery packs to explain the difference.

At this time, everyone watching the video became very interested. It should be said that not only him, but many people who are interested in the upstream and downstream industrial chains of new energy are watching closely.

At this time, Chen Changliu pointed to several simple pictures on the wall and said:

"There are several major reasons for the spontaneous combustion and explosion of power lithium batteries.

First: external short circuit.

Whether it is a lithium battery pack or a lithium battery cell, when short-circuited, the positive and negative electrodes are short-circuited instantly, the energy is released instantly, and the temperature rises very quickly.

If the thermistor PTC and the explosion-proof valve CID inside the lithium battery cell fail, the temperature will continue to rise, the diaphragm will be burned, the positive and negative electrode materials will be in direct contact, and the internal explosion will easily occur.

Second: The ambient temperature is too high.

The charging temperature range of conventional lithium-ion batteries is 0~45℃; the discharge temperature range is -20~65℃.

If the battery cell works beyond the temperature range, it is easy to cause the internal diaphragm of the lithium battery cell to shrink, the positive and negative electrodes to short-circuit, and thus catch fire and explode.

Third: Affected by external forces, such as collision, extrusion, acupuncture, etc.

When a lithium-ion battery is affected by external forces, the structure will deform, the internal materials will be damaged, and the positive and negative electrode materials will short-circuit directly inside the battery cell, causing the lithium battery to explode.

So for so many behaviors that are prone to spontaneous combustion and explosion, does the flower grower have a solution to deal with it?

I am proud to say that yes, of course.

With huge capital investment and the efforts of a large number of technical engineers, we have not only made breakthroughs in basic materials, but also the packaging process and electronic control system are absolutely the best in the world, without a doubt. "

PS: The typo will be updated first and then corrected.