March 29, BYD officially announced the launch of the "blade battery", we can understand it as a new generation of "lithium iron phosphate" battery, not before we often hear of three yuan lithium batteries. So, what are the advantages of the blade battery?
In 2015, China's electric vehicle industry suddenly accelerated, when most electric vehicles equipped with batteries are lithium iron phosphate batteries. Due to the state regulations of the battery energy density is getting higher and higher, and at the same time in the limited volume, manufacturers are more willing to maximize the range, and then in order to meet the needs of consumers on the range. Therefore, after 2016, most car companies are gradually switching to lithium ternary batteries, which have higher energy density and can carry more power in the same volume.
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What are the advantages of lithium ternary batteries? For the same volume, lithium ternary batteries can store more power than lithium iron phosphate batteries due to their high energy density. In other words, the same car, respectively, equipped with lithium ternary batteries and lithium iron phosphate batteries, then equipped with lithium ternary batteries range than lithium iron phosphate batteries is certainly higher.
Not only that, the ternary lithium battery can support the output, input power is also stronger. Because, chemically, ternary lithium batteries are more active compared to lithium iron phosphate batteries. How to understand it? In short, we prepare two pockets, one of the pockets of the pocket is bigger (lithium ternary), and the other pocket is small (lithium iron phosphate), then relatively speaking, the pocket with a large mouth can be filled with more rice, at the same time can be poured out of the amount of rice or the speed of the larger and faster.
Put into the electric car, we can understand that the three yuan lithium battery charging efficiency is higher. In addition, the maximum power of the vehicle performance data, can also be higher. Seeing this, we can't help but ask, is there no downside to Li-ion ternary batteries?
It is true that, in general, everything has two sides. China's new energy vehicle subsidies year after year, the subsidized vehicles have more and more stringent regulations on the battery on board. And this more and more stringent regulations, the most important consideration is the battery's "energy density", that is, the energy contained in the unit volume. Therefore, China's major car companies are more willing to use ternary lithium batteries. However, the energy density is getting higher and higher at the same time, the disadvantages of the three yuan lithium battery is more and more exposed.
Diagram from the Internet
The stability and safety of lithium ternary batteries are relatively poor due to their higher activity. With the increasing range, the NEDC range of mainstream electric vehicles at this stage generally exceeds 400 kilometers, and has even reached 500 kilometers, 600 kilometers. However, consumers know that the so-called NEDC range publicized by manufacturers, our daily driving, it is difficult to achieve. Despite the large capacity of the battery pack, the ternary lithium battery is relatively more active and unstable, which leads to a faster output of its power.
Another disadvantage or drawback of the active battery is that it is "unsafe". Previously, the editor had an interview with the then technical engineer of BAIC New Energy. According to him, the batteries of electric vehicles generally do not explode, so although we are often concerned about the safety of electric vehicle batteries because of power battery explosions, but we think about it, we will find that the total number of electric vehicles compared to gasoline vehicles, the number of natural less.
As mentioned earlier, this engineer was preaching that there is generally no spontaneous combustion, and buts. Once an electric car spontaneously combusts, that's likely to cause an explosion. Therefore, the engineer introduced, if you find the electric car smoke, there is a tendency to spontaneous combustion, then we as far as possible do not choose the fire extinguisher to put out the fire, or to ensure their own personal safety is the main focus, as soon as possible away from the vehicle.
In 2019, the video of a Tesla car basement suddenly exploded on the Internet, and it seems to have once again confirmed that the engineer at that time said is not false. So there's no excuse for us consumers to be concerned about the safety of power batteries, as the chemistry produces changes that can explode rather than simply burn.
So lithium iron phosphate batteries don't have these problems? Truth be told, there still are! It's just relatively safe. The network also has more lithium iron phosphate battery and ternary lithium battery comparison. I'll briefly list the advantages and disadvantages of the two sides, as follows:
So, we can see that large electric vehicles on the market, such as buses, freight vehicles, and so on, are still equipped with relatively more stable LiFePO4 batteries.
So, is there a third possibility? So far, the focus of this article came. BYD battery started, its unique battery technology has made it many times among the world's top five power battery production, technology is a unique martial arts. The core of the BYD battery, lithium iron phosphate batteries.
In recent years, as the country's energy density of passenger cars carrying energy batteries is getting higher and higher, BYD had no choice but to replace the ternary lithium batteries. Originally, the brief use of ternary lithium batteries BYD in the "hold big moves". From last year, Wang Chuanfu in China's electric vehicle forum clearly said that the blade battery will be launched, to the recent BYD official release of three kinds of power battery "puncture" experimental video, we finally understand, "technology maniac" Wang Chuanfu is not false, to R & D, technology, BYD is famous. The company is also known for its technology, and BYD has not let consumers down.
The so-called blade battery, in fact, the internal raw materials are still the same as lithium iron phosphate batteries, but whether it's the shape of the power battery, the internal structure or assembly methods, BYD has done a comprehensive update. Of course, BYD has yet to open its patent on the blade battery, and we can only learn about it from some expert analysis and videos and data released by BYD.
What we know so far is that the energy density of the blade battery breaks through the bottleneck of the original lithium iron phosphate, and increases by 50 percent on the basis of BYD's original lithium iron phosphate battery. In addition, due to the internal structure, diaphragm materials and other aspects of multi-dimensional technology updates, blade batteries compared to lithium iron phosphate batteries are more stable?
With the words of BYD Chairman Wang Chuanfu, who has been known as a technology fanatic, BYD wants to use blade batteries to erase the word "spontaneous combustion" from the dictionary of new energy vehicles! With technology confidence and seeing is believing, we have reason to believe that BYD's razor-sharp batteries may make consumers feel more secure when purchasing electric vehicles. Let's talk more about this BYD puncture test.
What is a puncture test? What is the purpose and need for the side-by-side test?
The so-called puncture test is literally a 3-5mm heat-resistant steel needle that is vertically inserted into a power battery. The specific process of the test can still be seen at a glance through the video uploaded by BYD. In fact, in the early days, China's electric vehicle power battery is required to conduct puncture test, but due to the interests of many parties, our country in recent years in the regulations and canceled the puncture test. Just, we should not overly look at the results of the puncture test. Because in the regular state, there is still a protective shell on the outside of the power battery, it is extremely difficult to have a real environment similar to the puncture test. The puncture test is only for the most extreme cases, the safety of the power battery.
But that's OK, it doesn't stop car companies from doing separate tests. At the same time, the puncture test is also a "standard" for almost every manufacturer or battery maker. From the video results on display, the market sale of lithium ternary batteries in a few seconds after the puncture test, smoke, fire and then exploded, a reaction to the common three yuan lithium batteries on the market today, after the puncture test of insecurity, instability.
Lithium iron phosphate batteries in the puncture test, the reaction is obviously not as big as the three yuan lithium batteries, but will still be affected by the puncture, the battery occurred in the short-circuit phenomenon, while the battery temperature is also gradually rising.
Blade batteries, after a long time after the puncture test, the battery temperature is still normal, the battery can still continue to output voltage, highlighting its safety. Having said that, some of you may ask, why can blade batteries be so safe? Truthfully, I don't know. Because this technology is now in the hands of BYD, I'm afraid it's hard for us to fully understand without them revealing it. Still, we can make assumptions.
Because of its battery structure, as shown in the video, the volume of the blade battery is relatively flat, in the needle lab, the steel needle into the battery, its internal structure is relatively "isolated", that is, the pierced cell can not form an effective ski reaction with other cells, and then avoided the internal short circuit. Of course, this possibility is possible, but the final result and the answer, still need to be told by BYD.
With BYD's release, the blade batteries will be used in BYD's new sedan, the BYD Han, and later in more of BYD's models. Relatively speaking, the research and development of new technology is the need to be cautious, so at present I am afraid that BYD side can not large-scale mass production of blade battery. In addition to R&D issues, there is also the issue of cost. As we all know, BYD's technological advantage in the field of new energy is through the real money smashed out of the high R & D costs has been BYD's advantage, but the success of the new technology development, how to recover the cost and improve profits, is the problem faced by every enterprise.
Editorial analysis, blade battery will be the earliest at the end of 2021, large-scale mass production, 2022, or will cooperate with other automakers, it is difficult to start this year, large-scale mass production. Wang Chuanfu has revealed that the birth of the blade battery is actually for the development of China's power battery route "corrective". Through his point of view, we can also believe that Wang Chuanfu is trying to use the blade battery to break the current situation of ternary lithium batteries dominate the market. At the same time, the emergence of blade batteries will gradually affect the consumer thinking about power battery safety.
Safety has never been an issue to be ignored, and it is even more important in the relatively new field of electric vehicles. Whether it's the death of a person caused by autonomous driving, or the death of a person caused by a power battery, all the sophistry in front of life is abhorrent. When it comes to safety, both the authorities and manufacturers should take precautions to ensure that nothing goes wrong. Doing our best to protect the lives and property of consumers is the most normal and important thing.
This article comes from the authors of the automobile home car family number, does not represent the views of the automobile home position.