Then, in February, it was reported that Tesla would carry a cobalt-free lithium iron phosphate battery on the model3 model.
Unexpectedly! At the beginning of 2020, the two largest vehicle manufacturers in the field of new energy vehicles made efforts to lithium iron phosphate, which indicated that lithium iron phosphate batteries broke out again and had great prospects.
Different: different brands and directions.
In recent years, influenced by relevant national policies, ternary lithium batteries with high energy density advantages have been used more and more.
Tesla pays attention to improving the energy density of ternary lithium batteries. Excessive energy density has gradually exposed some unstable factors, and there have been many fires around the world, which has caused consumers to worry about the reliability of new energy vehicles.
BYD always insists on walking on two legs, taking lithium ferrous phosphate and lithium ternary as the main direction of power battery. In BYD, safety is defined as the highest level. In the technical route of ternary lithium battery, a relatively conservative energy density scheme is also adopted, and there is no safety accident of power battery. In the field of lithium ferrous phosphate technology, BYD has been in a leading position and accumulated rich experience in technology research and development and application.
Ternary lithium battery has become a new favorite because of its high energy density, but the instability caused by high energy density is also worrying. Lithium iron phosphate battery technology has attracted more and more attention for its higher stability.
Strategy: Start the change of battery technology route.
At the moment when safety and life have replaced energy density and become the general evaluation standard of new energy automobile industry, lithium iron phosphate power battery, which was once "out of favor" for a short time due to insufficient energy density, is safer and more reliable, so there are more possibilities. Top brands began to rethink how to balance the relationship among energy density, charging efficiency and safety factor of power batteries.
When we return to the strategic choice behind the technical route, we have to feel BYD's strategic vision.
With the strategic vision of deep understanding of the industry, BYD took the lead in handing over the answer sheet of "Blade Battery" with the world-leading lithium iron phosphate battery technology.
First place: always battery safe.
No matter when new energy vehicles just emerged ten years ago, or now when the annual sales volume has exceeded 654.38+0.2 million, when consumers face the question of "which part is the most important to buy electric vehicles", the answer given is always batteries. And the safety of the battery is the most important.
According to the Report on Big Data Safety Supervision Results of National Supervision Platform for New Energy Vehicles, From May to July, 2065438+09, 79 safety accidents involving 96 vehicles were found on the national supervision platform of new energy vehicles.
Looking back on the development of lithium batteries, mobile phone batteries and computer batteries have also gone through this stage. Later, with the establishment of industry safety standards, the battery safety problems were alleviated and the quality was controlled.
Within BYD, battery safety is defined as the highest level. Even for ternary lithium batteries, BYD chose a relatively conservative energy density scheme, which also made BYD's power battery safety accident record.
Start-up: the core advantage of high security and long life.
According to BYD's official data and related patents, the so-called "blade battery" is actually BYD's new generation lithium iron phosphate battery, also known as super lithium iron phosphate battery. The reason why it is named "blade battery" is mainly because the arrangement of cells is inserted into the battery pack like a "blade", which is different from the traditional power battery cells.
The safety of blade battery based on lithium ferrous phosphate technology is greatly improved, and its runaway temperature is much higher than that of ternary lithium battery. At the same time, the overall rigidity of the battery pack is higher, and the deformation resistance, extrusion resistance and puncture resistance are stronger, and the probability of short circuit inside the battery pack is close to zero.
BYD's original seven-dimensional four-layer battery safety system has corresponding protection measures in every dimension and level. Among them, the fourth level refers to monomer, module, battery pack and system, and the seven dimensions include reliable connection, high voltage protection, collision, overcharge, short circuit and thermal runaway, which effectively protects the battery safety in all directions.
With technology and system, BYD blade battery will definitely define the new global safety standard of power battery again.
In addition, compared with ternary lithium batteries, blade batteries also have incomparable advantages in the service life of batteries. The number of battery cycles has been greatly improved, and the service life of blade battery has exceeded 6.5438+0 million kilometers, and the practicability of the whole vehicle has been improved by several orders of magnitude.
First place: Blade battery will be mounted on BYD Korean model.
Recently, Wang Chuanfu, chairman of BYD, announced that BYD's "Blade Battery" will start mass production in Chongqing factory in March this year, and it will be carried for the first time in BYD Korean EV listed in June.
According to the catalogue, Korean EV models are available in single-motor and dual-motor versions. The dual-motor version has a maximum battery life of 605 kilometers under NEDC condition, and its applicable battery system energy density is 140Wh/kg. This value is slightly lower than the NCM8 1 1 (high nickel battery) released and put into production by Contemporary Amp Technology Co., Ltd. last year, and the highest energy density of inclusions reaches 180Wh/kg, which is also lower than the highest system energy density150 ~/kloc-0 of products mainly promoted by overseas mainstream battery manufacturers such as LG Chemical and Panasonic.
Wang said: Compared with ternary lithium batteries, lithium iron phosphate batteries have inherent disadvantages in energy density, which is also a major reason why ternary lithium batteries are becoming more and more popular. But compared with ternary lithium battery, lithium iron phosphate battery has the advantages of high safety and long service life. Nowadays, "blade battery" effectively weakens the shortcoming of low energy density of lithium iron phosphate battery, and its application prospect will be broader in the future. For BYD, lithium iron phosphate battery is its strength, and "blade battery" is bound to make it even more powerful.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.