After the release of "Blade Battery": Do you believe that I said that electric vehicles will never spontaneously ignite again?

We've been trying to make a big news all day, and finally there's a big news. BYD officially released the blade battery on March 29th, and successfully mass-produced it at the Chongqing factory of Foday Battery Company.

There are several important points about BYD blade battery, which I try to understand in the simplest words. This battery is made of lithium ferrous phosphate, and the raw material is different from our common ternary lithium battery. The energy density per unit volume of lithium ferrous phosphate is only about 80% of ternary lithium, but its advantages are safety, long service life and low cost. The protagonist of this paper, the blade battery, is named after the shape of the lithium iron phosphate battery core is made into a flat blade shape. Lithium iron phosphate battery is not a new material, and the blade shape is not strange. Why can this make BYD's market value soar by 60 billion in the industry?

With it, there may be no spontaneous combustion of electric vehicles in the world.

You have seen the news of spontaneous combustion of electric vehicles, I have seen it, and everyone has seen it. In fact, the cause of spontaneous combustion of electric vehicles is very single, almost all of which are caused by short circuit of ternary lithium power battery. In short-circuit state (similar to battery acupuncture experiment), ternary lithium battery will rapidly produce surface high temperature above 500 degrees Celsius, accompanied by open flame and deflagration. Under the same shape, the short-circuit consequences of lithium iron phosphate battery are much less, the surface temperature reaches 200~400 degrees Celsius, and there is no open flame.

The blade battery, on the basis of the safety of lithium iron phosphate battery itself, increases the surface area of each cell through the blade shape, thus greatly improving the heat dissipation effect. Therefore, in the acupuncture short-circuit experiment, after a period of time, the surface of the blade battery is only 30~60 degrees Celsius, and even eggs can't be cooked at this temperature, let alone let the car spontaneously ignite.

The purpose of blade battery is to change the life of lithium ternary.

As mentioned above, neither lithium ternary nor lithium ferrous phosphate is a new battery material. Then why do 90% of electric vehicles on the market use ternary lithium, which is obviously more hidden, instead of lithium ferrous phosphate? The reason is simple: sometimes capital really has more say than human life. Almost everyone who cares about pure electric vehicles will ask this question: How long will this car last?

We always require the battery life of pure electric vehicles to be longer and longer. For longer car life and larger battery capacity, manufacturers will certainly choose lithium ternary with higher unit energy density instead of safer lithium ferrous phosphate.

▲ Blade battery and its battery pack

However, in today's successful mass production of blade batteries, we may no longer need to rely on ternary lithium to create long battery life. Although we can't change the slightly lower energy density of lithium ferrous phosphate, the shape of the blades makes these batteries more closely arranged in the battery pack with the same volume, so that batteries with larger mass can be put into the whole battery pack, which makes up for the shortcoming of low energy density of lithium ferrous phosphate and ensures the total capacity of the whole battery pack. At present, it is determined that BYD Han equipped with blade batteries has a nominal cruising range of 605km, which is quite good.

▲ Determine who BYD Han will match the blade battery.

Another killer of blade batteries is cost. With the continuous progress of production technology and technology, the decisive factor of battery production cost has tilted towards raw materials. Lithium iron phosphate battery does not contain precious metals such as nickel and cobalt, so the cost is naturally cheaper than ternary lithium containing precious metals, and the price difference is still expanding. In addition, BYD's upstream and downstream supply chains are almost all arranged by one hand, and the manufacturing cost of blade batteries can be further reduced. The energy density of blade battery is equivalent, and the cost and safety can crush ternary lithium. How can it smell bad?

Do you still dare to laugh at "overtaking in a corner"?

▲ Tucki P7

BYD's mass production of blade batteries has undeniably led China's battery manufacturing to the forefront of the world. From this point, we can see the development status of new energy vehicles in China. New brands, such as Tucki, Weilai and Ideality, have produced mass-produced products and had a good experience. The mileage of Tucki P7 Ministry of Industry and Information Technology has exceeded 700km, becoming the pure tram with the longest cruising range in China NEDC. Many traditional independent brands also tilt their R&D resources to the energy direction, firmly monopolizing the domestic new energy vehicle market within 200,000.

As one of the core components of pure electric vehicles, batteries account for nearly 40% of the manufacturing cost of electric vehicles. In China, there are at least two battery manufacturers with world-class technology level, namely Contemporary Ampere Technology Co., Ltd. and BYD, which indicates that China has mastered the core technology of power batteries.

Let's take a look at the electric vehicle layout of foreign first-class car companies. For example, Tesla, people have the impression of fast speed, long battery life and advanced autonomous driving technology. However, as time goes by, Tesla's advantages are obviously not as good as before. For example, the domestic model we borrowed before? 3 low battery life version, fully charged battery life is only 380km, and the battery pack consisting of 2 1700 ternary lithium columnar batteries is lacking in technical highlights.

However, traditional manufacturers, such as Volkswagen's ID.3 and BMW's i4 in the concept car stage, have no bright spots in their published battery life, power and other parameters, and their technology is no longer advanced. From this point of view, I think it is inappropriate to say jokes like "overtaking in a corner is a joke" and "turning over in a corner".

The country is vigorously developing new energy vehicles such as pure electric vehicles, so we don't need to look at them too narrowly. Of course, friends who don't have charging conditions still have pain points in using electric vehicles, but it is a bit deceptive to completely deny electric vehicles. There are also many living examples around. All owners of electric vehicles with fixed charging conditions will constantly praise the good daily traffic of electric vehicles. Today's electric vehicle technology is progressing at a speed visible to the naked eye. Even compared with two years ago, the cruising range, charging speed and charging method have undergone earth-shaking changes.

Buying an electric car definitely doesn't mean living a life of waiting in line for charging piles and worrying about mileage every day. On the contrary, more people with the right conditions can experience a better car life. From a higher level, the electrification of automobiles can also improve China's dependence on foreign crude oil and oil, which is beneficial to the country's development. The mass production of blade batteries in China this time is a milestone in the development of new energy vehicles in China.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.