There are some questions about BYD's patent. Wang Chuanfu, chairman of BYD, announced mass production through forums rather than company announcements. Under the circumstances that the new Securities Law is about to be implemented and the supervision of information disclosure is becoming more and more strict, this practice is not appropriate.
In fact, in June 2065438+2009, BYD revealed at the interim results exchange meeting that the company will launch a new generation of lithium iron phosphate batteries in May-June 2020. This time I called a very loud name, but it caused a lawsuit, which BYD did not expect.
However, in response to external doubts, BYD changed the "core patent" to "invention patent". After all, the core patents in the battery field, like those professionals who question BYD, are not in our hands, but in the hands of "crooked nuts". The core patent must be an invention patent, but the invention patent is not necessarily a core patent.
After all, this is the "super lithium iron phosphate battery" developed by BYD for many years. Blade battery is not a breakthrough in material, because the material is still lithium ferrous phosphate, but an innovation in battery structure design, which is unacceptable to many people. Because the monomer energy density has not improved, it is just "changed into a big bag". So, let's see how the blade battery can improve the volume energy density.
BYD introduced itself, the battery has been brewing for a long time, and currently has more than 300 core patents. The main feature of blade battery is to flatten the battery core, and the length can reach 2500mm, so the volume energy density can be increased by 50%. Moreover, the vehicle's eight-year battery life can reach more than 654.38+0.2 million kilometers (this conversion is very simple, and the battery life of 600 kilometers is multiplied by the life of 2000 cycles). Most importantly, the cost of new products may be reduced by 20 ~ 30%.
The specific energy density of BYD lithium iron phosphate battery can reach 180Wh/kg, which is about 9% higher than before. This data is not weaker than "8 1 1" ternary lithium battery, which means that "blade battery" has reached the energy density of high-level ternary lithium battery while retaining high safety, high stability and low cost.
One thing we need to pay attention to is that the battery energy density is defined by two dimensions. One is the specific energy density by weight (that is, the dimension adopted by the Ministry of Industry and Information Technology) and the other is the specific energy density by volume. Although BYD's blade battery has only increased its weight specific energy density by 9%, its volume specific energy density can be increased by 50%. This is the greatest progress.
However, even if the technical bottleneck of low energy density is broken, the low temperature limit of lithium iron phosphate battery is only MINUS 20 degrees, which limits its application scope. Like winter in the north, it is not as good as ternary lithium battery. Therefore, BYD also needs to constantly overcome these problems.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.