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Not long ago, BYD officially released the blade battery (blade lithium iron phosphate battery). In addition to better space utilization, BYD also focused on promoting to the outside world that the battery can solve the problem of thermal runaway through the acupuncture test of simulating the short circuit of the cell. This move has also triggered online controversy over the technological routes of the two major domestic new energy power battery giants, namely BYD, which is mainly based on lithium iron phosphate battery technology, and Ningde era, which is mainly based on ternary lithium-ion battery technology.

Li Yunfei, deputy general manager of BYD Automobile sales Company, also said, "not convinced?!" Let's prick it, too! Acupuncture is the most difficult, comparable to climbing Mount Everest! " To this end, recently, Ningde Times officially released a video of "battery package acupuncture test". Ningde Times did not explain whether Ningde era battery could pass the acupuncture test of simulating cell short circuit, but explained to netizens that the battery bag shell of Ningde era was so hard that the steel needle was broken.

By directly piercing the battery pack with a steel needle to solve the "battery safety problem", many netizens said that the practice of the Ningde era was difficult to understand. Some netizens think that, as a big battery company, this test is an insult to the intelligence of the public?

On the evening of May 22, the official Weibo of the Ningde era of CATL posted a video saying, "what hinders the needling test in the Ningde era?" Is it technology? Is it physique? Is it the face of a giant? No, it's a steel needle! " Officials say the three-yuan battery pack of the Ningde era cannot be pierced by a steel needle at all.

From the video, Ningde era technicians conducted a needle test on the ternary battery pack in the laboratory, and finally the steel needle was' broken'in the process of piercing the battery pack shell, which also shows that the battery pack shell is very hard.

The shell of the battery pack is very hard, what does it have to do with the safety of the cell? As a contrast, BYD's key promotion of the "acupuncture test" requires the power battery cell to be pierced with a steel needle, causing a large area of short circuit inside the cell, and the energy will be quickly released in a short time through the internal short circuit, causing the temperature to rise sharply in a short period of time and trigger a chain reaction, resulting in heat out of control.

Through BYD's official acupuncture test, the ternary lithium battery burns violently, the surface temperature exceeds 500℃, and the thermal runaway phenomenon is obvious, while the blade battery has no open fire and smoke, and the performance temperature is 30 ℃ ~ 60 ℃.

The object of the real acupuncture test is the "cell", which essentially simulates the short circuit of the battery, not the problem of piercing or not piercing. On the other hand, in the Ningde era, by changing the concept, ignoring the problem of the battery cell, and directly doing the acupuncture test on the battery pack, the safety problem was publicized by piercing the battery package shell.

Netizens joked that Ningde era's move is to promote their own mastery of battery package shell core technology ah. Many netizens also said that in the Ningde era, did you look down on everyone's IQ?

Some netizens said that the release of the video in Ningde era was "self-hacking". After all, the hard shell of the battery pack is not the exclusive technology of the Ningde era, and other brands can do it relatively easily.

In response to this problem, Ningde era insiders explained to the media that passing acupuncture does not mean battery safety, not doing acupuncture testing does not mean battery safety, and the safety of power batteries is mainly manifested in system thermal safety, mechanical safety, electrical safety and functional safety, not just the safety of batteries. He believes that in reality, the acupuncture of the cell will not happen, and the blunt piercing and squeezing at the bottom of the battery pack are more in line with the real scene.

He also admitted, "Lithium iron phosphate batteries are easier to pass through acupuncture not because of advanced technology, but because of the good thermal stability of the material itself, but acupuncture is a challenge for ternary batteries with higher energy density, but it is not impossible. In order to achieve real market security, it needs to be guaranteed by all levels of security system, not through a single test. "

Which is more convincing, the acupuncture test of the battery cell or the "battery package acupuncture test" of the Ningde era? in fact, consumers have their own conclusions.

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