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The development of new energy vehicle market has welcomed the development wind recently. According to the data of the China Automobile Association, in February this year, the production and sales of new energy vehicles were 124000 and 110000, up 7.2 times and 5.8 times respectively year on year. This month, new energy vehicles have continued to refresh the production and sales history of that month for eight months.

Under the high rise, the topic of new energy vehicle safety has not been forgotten.

It is undeniable that, as a new thing, the development of new energy vehicles has room for technology improvement. At the same time, it also bears the pressure of public opinion as an industrial reformer.

In particular, as the heart of electric vehicles, batteries not only bear the heavy responsibility of the endurance of electric vehicles, but also are important variables that affect the safety of electric vehicles.

Since last March, when BYD marketed blade battery technology, battery safety has been under the spotlight. The dispute over the superiority of lithium iron phosphate and ternary lithium battery has also been frequently eaten by the outside world.

In fact, in terms of big data, the probability and number of spontaneous combustion accidents of pure electric new energy vehicles are far less than those of traditional fuel vehicles.

According to the statistics of High Industry Research Institute (GGII), in the first half of 2020, there were about 20 spontaneous combustion incidents of domestic new energy vehicles. However, the number of spontaneous combustion accidents of domestic traditional fuel vehicles during the same period is several times or even dozens of times.

The autoignition rate of pure electric vehicles in China's new energy vehicle industry is 0.0032%, which is close to 0.003% in the United States. The autoignition rate of traditional fuel vehicles in China is 0.015%. In other words, the ratio of autoignition rate of fuel vehicles and pure electric vehicles is very close to 5:1.

There are frequent voices in the industry about the probability difference between electric vehicle spontaneous combustion and traditional fuel vehicle spontaneous combustion.

However, as a new thing, the safety of new energy vehicles is obviously more concerned by the industry, and also more able to provoke consumers' sensitive nerves about product safety.

Recently, following the advent of BYD's blade battery technology, the magazine battery of GAC E'an has also successfully achieved success through the acupuncture experiment, bringing the competition between lithium ternary and lithium iron phosphate battery technology routes to the public's view.

GAC Ai'an magazine battery source: public picture

More importantly, the technology related to the safety of new energy batteries has taken another step forward.

The full name of the so-called acupuncture experiment is acupuncture heat diffusion experiment. As the name implies, it is to stab a needle into the single cell of the battery pack with the help of external force to observe whether there will be spread in the battery pack and whether there will be smoke, spontaneous combustion, fire and other phenomena in the battery pack, so as to test the safety of the entire battery pack.

The whole package puncture test of magazine battery officially released by GAC E'an can also be seen as a counterattack on the safety of ternary lithium battery pack.

Following the launch of the magazine battery, the topic of battery safety has again been concerned by the outside world. The specific technical route and application prospect of ternary lithium battery and lithium iron phosphate battery, and the technical difference between blade and magazine battery have become a problem worth discussing.

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