The advantages and disadvantages of BYD blade battery are introduced, and the authenticity of BYD blade battery is questioned.
; ? BYD's blade battery was first noticed by the public, which originated from a video of acupuncture test. This acupuncture test can be described as Kilimanjaro in the field of batteries. During the test, the steel needle directly passed through the battery cell, causing a large area short circuit or even fire in the internal circuit. Success is Xiao He, failure is me. Some people think that this video highlights the new technology of BYD battery, while others doubt the authenticity of blade battery.
_ What is a blade battery?
First, correct a misunderstanding. Some people think that blade battery is a new type of battery, which is different from ternary lithium battery and lithium iron phosphate battery. In fact, the "blade" is just the shape of a single battery, and its essence is lithium iron phosphate battery. Blade battery flattens a single battery cell, and the thickness becomes thinner after the width is lengthened, and the dimensions of length, width and height are reduced to 960mm * 90mm *13.5mm..
From top to bottom, thermal insulation cotton, thermal management module and thermal insulation materials are distributed inside the battery pack. The battery case is outside. Water-cooled heat dissipation plate and strength mechanism for supporting battery are also entrained inside.
Traditionally, cylindrical single cells will form more gaps after stacking, and then the space utilization rate can only reach more than 40% except for supporting heat dissipation and supporting components. Flat-bladed battery can reduce the invalid gap between single cells, and the increase of area also plays a very important role in heat dissipation. After the overall arrangement, the space utilization rate of the blade battery is as high as 60%.
_ Acupuncture test
BYD selected two most popular batteries for pure electric vehicles as test objects, namely ternary lithium battery and lithium iron phosphate battery.
Of the three, ternary lithium battery is the worst. After the steel needle was pierced, the eggs on the battery were blown up, and the battery itself burned violently, and the surface temperature exceeded 500℃.
Ordinary lithium iron phosphate bulk battery performed slightly better. Although the temperature also rose to 200 ~ 400°C and the eggs were burnt, there was no open flame, only a little smoke.
Blade battery performed best in this experiment. The shape of eggs observed by naked eyes has not changed much. The battery has no open flame explosion and smoking, and the surface temperature is controlled between 30 ~ 60℃.
_ Advantages of blade batteries
1, the energy density per unit volume of the battery is improved, which is more than 1/3 than that of the traditional battery.
2. The cost of materials is reduced by about 1/4, including materials and human resources.
3. The battery is small, which can bring better space performance to the vehicle.
4. The battery is light in weight, so the energy consumed to overcome its own resistance is reduced, and the battery life is further increased.
5. Better safety performance. Under the conditions of high temperature, overcharge, extrusion and acupuncture. The probability of battery fire and explosion is reduced.
_ Disadvantages of blade batteries
1, poor charge-discharge performance at low temperature. This is an "occupational disease" in lithium ferrous phosphate, and the battery capacity will be greatly reduced under cold conditions in winter. The lower limit of low temperature in lithium iron phosphate is -20℃, while that of ternary lithium battery can reach -30℃ ... The low temperature attenuation of lithium ternary is about 10%, and that of lithium iron phosphate reaches 20%.
2. It is difficult to repair the battery after being collided. Because the blade battery saves the structure of supporting the battery cells, each battery cell itself is a bracket. It is difficult to ensure the integrity of the battery under the impact of external force. If one battery is damaged, other batteries in series will also be affected.
_ Blade battery questioned the storm
At that time, the "Korean" model of blade battery had not yet been listed, and everything remained at the point of slogan, which had caused BYD's market value to skyrocket by nearly 14%. There is a particularly prominent article that comprehensively attacks BYD's "liar" behavior, and those who are interested can search for it themselves. These comments are summarized as follows:
1, BYD's battery technology innovation did not involve battery electrodes or other important components.
2. The density of the blade battery is increased, which actually increases the battery volume and puts in more battery packs.
3. The decline characteristic of lithium ferrous phosphate has not been solved, and the annual decline is 100km.
4. BYD's patent on blade technology is very difficult, because it takes a long time to apply for a patent, while BYD only took one year.
......
The article criticized and questioned BYD at length, and dared not say whether there was any point, but at least there were many prejudices in his speech. To this end, BYD also specifically clarified this issue.
Blade battery is BYD's declaration to return to the battlefield. After 20 17, BYD was surpassed by Contemporary Ampere Technology Co., Ltd. and lost the first position of domestic batteries. BYD has always insisted on lithium iron phosphate battery, squeezed by ternary lithium battery with high energy density and low price. The "blade battery" we are hearing now is actually the "super battery" plan proposed by BYD in 20 19. Contemporary Amperex Technology Co., Ltd. has opened an era, but can BYD end it? In a war without smoke, the outcome is quietly carried out under the undercurrent, and the sieve of the market will hand over the final answer.
What are the advantages and disadvantages of the blade battery released by BYD?
BYD's blade battery has the advantages of high safety and light weight, but the disadvantages are poor low-temperature discharge performance and difficult maintenance after battery bumping.
As an important supplier of electric vehicle batteries in the world, BYD has launched a self-developed blade battery in order to seize the new energy battery market. Although BYD's blade battery has been welcomed by many netizens, there are still many people who question the reliability of BYD's blade battery.
First, BYD's blade battery has high safety and light weight.
Many consumers are still worried about new energy vehicles, because they are afraid of the explosion of new energy vehicle batteries, and BYD's blade battery has changed the internal structure of the battery, making the blade battery safer. In addition, the blade battery only occupies a small part of the space of new energy vehicles, which makes it possible for new energy vehicles to expand their internal space.
Second, BYD's blade battery has the disadvantage of poor discharge performance at low temperature.
In fact, many new energy vehicles will have the problem of insufficient power at low temperature, and although the blade battery has been effectively improved in this respect, BYD's blade battery still has the disadvantage of poor low-temperature discharge performance. If BYD's blade battery does not get rid of this big shortcoming, it will lead to BYD's blade battery not being successfully promoted in overseas markets.
Third, besides poor discharge performance, high maintenance cost is the biggest disadvantage of BYD blade battery.
If the owner accidentally damages the blade battery, the owner will not only be unable to drive his car for a long time, but also spend a lot of maintenance fees to repair the battery, because the blade battery is more difficult to repair than other new energy vehicle batteries, so once there is a serious problem, the blade battery will even account for 1/3 of the cost of the whole vehicle. If BYD doesn't work hard to solve the problem of high cost of blade batteries, then the owner will not continue to consider BYD's car next time he replaces a new energy vehicle.
What are the advantages and disadvantages of the blade battery released by BYD?
BYD's blade battery has many advantages and disadvantages, among which the advantage is that the safety factor is relatively high, and the blade released by BYD is relatively light and easy to take. Of course, it also has some shortcomings. Its disadvantage is that its discharge performance is slightly poor at low temperature, which is not fatal, but it still has some influence.
With the development of modern science and technology, the introduction of blade batteries has attracted the attention of many riders. Of course, it is necessary to have a blade battery with good selectivity and high utilization rate. At present, BYD's blade battery.
I. Blade battery
The blade battery released by Lydia was manufactured by lithium ferrous phosphate technology, which was installed in the ocean for the first time. Moreover, the module can be skipped during reorganization, which greatly improves the volume utilization rate and finally achieves the design goal of loading more batteries in the same space. Compared with the traditional battery, the volume utilization rate of the battery is increased by more than 50%, that is to say, the cruising range can be increased by more than 50%, reaching the same level as the high energy density ternary lithium battery.
Second, the advantages of the blade battery
Battery pack has many advantages. First of all, it has the advantages of high safety factor and light weight, which is actually very good. Moreover, this blade battery can reduce the possibility of battery explosion in new energy vehicles. Battery packs only occupy a small part of the space of new energy vehicles, which also gives new energy vehicles more space to do other things. These are some advantages of blade batteries. Bian Xiao thinks it is still very good.
Third, the shortcomings of the blade battery
Of course, blade batteries still have many disadvantages. First of all, if the blade battery is damaged, not only the cost will be lost, but also the vehicle will not run normally, and the maintenance cost will be high, which will greatly increase the cost of repairing the car. Moreover, as a sophisticated technology, it takes a long time to replace the blade battery, which completely affects the normal life of the driver, so this is also some shortcomings of the blade battery.