Domestic Tesla uses domestic batteries. According to the latest ministry of industry and information technology release of new energy vehicle promotion and application recommended model catalog (7th batch 2020), Tesla (Shanghai) Co., Ltd. Tesla Model3 standard life-extended version is listed, the type of energy storage device is iron phosphate lithium battery. It’s a change for Tesla, and it could be a turn for the entire battery industry.
Tesla has previously used panasonic and LG Chemical, but both offer triple lithium batteries. Iron phosphate lithium battery, or the first time.
The Ministry of Industry and Information Technology recently released the new energy vehicle promotion and application recommended model catalog (2020 batch 7), Tesla (Shanghai) Co., Ltd. Tesla Model3 standard life-extended version in the list, the type of energy storage device is lithium iron phosphate battery . . . Ministry
Although the document on the Ministry of Industry and Information Technology’s website does not provide the name of the supplier of the lithium phosphate (LFP) battery that Tesla will use, according to a previous statement from Tesla’s partnership with the Ningde era, the nind-era delivery period is essentially the same as the delivery time for the lithium phosphate Model 3, which is essentially the same as the lead time of July 1, 2020. It is speculated that the supplier of the lithium iron phosphate Model 3 was the Ninder era.
Unusually, BYD launched its “blade battery” in March this year, which is a lithium iron phosphate battery. And after the blade battery was introduced, the industry has caused a series of controversy over the safety of the battery.
Why has lithium iron phosphate battery become the focus of attention again? What’s the secret of the blade battery? And most importantly, as we mentioned in our previous article, how did they solve the problem of hard injuries in lithium iron phosphate batteries at low temperatures?
Blade battery or become the biggest winner
The blade battery factory in Lushan, Chongqing, is real.
Factory officials said that the blade battery has been four production lines into production, and the blade battery in the market response is good, by the end of the year may increase to eight production lines.
BYD has previously said publicly that the blade battery is only planned to be installed on BYD’s new model, the Han, and that, as things stand, one model is not enough to open eight production lines. It is clear that blade batteries are targeting manufacturers other than BYD.
BYD’s new model “Han” rendering map . . . Byd
The debate over lithium iron phosphate and triamcinal batteries has been raging since the blade battery launch on March 28. If anyone else doesn’t know about these two types of batteries, the Geek Park (ID: Geekpark) used to say, “The world is suffering from a long time of battery life, will the blade battery make a difference?” The difference between the two is explained in detail.
In a video released by BYD for the needle-stabbing experiment, the three-way lithium battery was punctured instantly exploded and burned, the temperature rose sharply, the surface temperature exceeded 500 degrees C, while the blade battery encountered a needle, there was no change on the surface of the battery, only side data can see that its temperature is slowly rising.
Video has become at the heart of the controversy, and the central point of the debate is: Is the triple lithium battery unsafe? The Ningde era then released a video of his own battery needle test, in which two three-dollar lithium batteries passed the needle test, no smoke and fire phenomenon.
The international recognition of battery safety has shifted from monomer safety to system safety, according to the Ningde era, “technically, there is a more optimized security solution at the battery pack level, and the actual need for single battery needle testing no longer exists.” “In other words, the safety of a single battery does not tell the whole story.
The Ningde era and BYD, the first and second place in China’s new energy vehicle battery manufacturers, because the three-way lithium battery in the needle test performance is different, triggered a war of words.
But in any case, the final winner in this debate is the blade battery.
There are also netizens have questioned, today’s three-way lithium battery core inside there are coiled and stacked two processes, three-way lithium battery and blade battery in the needle experiment results have a large difference, may be because the number of steel needles punctured, or because the steel needle puncture position is different.
BYD’s in-house technicians told Geek Park that the company had conducted various types of needle tests, including three steel needles that pierced the blade battery at different locations at different locations, with no difference from other tests.
How does the blade solve the battery life and low temperature?
“The innovation of blade batteries lies in many aspects, one of which is the structure. One industry insider commented.
The single battery, which is 96 cm long, 9 cm wide and 1.35 cm high, is arranged together by array, inserted into the battery pack like a “blade”, skips the modules and beams when grouping, reduces redundant components, forms a structure similar to a cellular aluminum plate, etc. – The blade battery achieves battery strength through a series of structural innovations, and the battery pack’s safety performance is greatly improved and the volume utilization is increased by more than 50%.
Chongqing Lushan Blade Battery Factory, the degree of automation has been very high . . . Byd
Not every battery manufacturer can “elongate” the battery. Sun Huajun, deputy general manager of the blade battery manufacturer Freddy Battery, said BYD has been thinking about the problems it encounters when it started making batteries, such as how to solve the problem of resistance, such as how to solve the fast charge. “We often talk to the industry and they think a 1-meter-long battery is basically impossible. “
The reason for the blade shape, BYD’s consideration is mainly related to the characteristics of the lithium iron phosphate battery itself.
Low energy density and poor performance under low temperature conditions is the main reason why electric car manufacturers abandon lithium iron phosphate batteries and choose the three-way lithium battery – chasing higher range is the biggest pain point for consumers, but also the key to manufacturers to make differentiation.
Because the energy density is relatively low, lithium iron phosphate batteries must be replenished by other means if they want to get on the bus.
Adding more batteries to a limited space is one of the best ways. As we all know, the battery pack of electric vehicles consists of multiple modules, in order to keep the cell module stable in the car, it is necessary to use bolts, beams, girders and so on to be fixed. The blade battery is a blade-like cell inserted directly into the battery pack, reducing redundant components, which officially says is the most compact scheme for battery packs, increasing volume utilization by about 50%.
Blade batteries reduce a large number of redundant components in the battery pack, resulting in increased volume utilization. Freddy Battery
At the same time, the energy density has also been increased to 160wh/kg, which is not much different from the energy density of pure electric vehicles with a triple lithium battery, given the 605 km range currently announced by BYD Han. Sun Huajun also mentioned that the energy density limit of the blade battery is 180wh/kg, and the range is expected to reach 700-800km next year.
Another bottleneck that needs to be addressed is low temperature. In the winter in northern China, the number of electric vehicle scars to be discounted, which is currently a problem for all mainstream batteries, lithium phosphate is particularly serious.
On the blade battery, this situation may improve. Sun Huajun told Geek Park, blade battery belongs to the high degree of integration of the battery package, from a spatial point of view, the distance between the cell and the outside world is short, the heat resistance correspondingly smaller, so BYD in the blade battery in the upper and lower parts of the increase dwelling material, the battery itself will heat up during the use of the process. In Sun Huajun’s view, the more central issue than insulation is how to deal with the thermal balance of battery packs.
“We’ve done a lot of work to make sure that the insulation capacity of each battery is balanced, ” Sun Told the Park said.
In the low-temperature charging performance, under minus 10 degrees C, the blade battery and the triple lithium battery charging time is not much difference, but at low temperature and low power charging power, the blade battery is only about half of the three-way lithium battery. Sun Huajun explained that this situation is also much higher than the actual need for use.
Why does lithium phosphate become “scented”?
People’s eyes are back on lithium iron phosphate, whether in the battery industry or the new energy vehicle industry, it is a very interesting thing. Why is lithium phosphate re-appreciated?
First of all, it can be confirmed that the lithium iron phosphate battery itself as the core power output of new energy vehicles, without any problems. In the choice of batteries, cost, battery life, safety and other factors are taken into account, the most outstanding average capacity may be the most appropriate.
Professionals expect that the declared cost of the domestic Model 3 will fall by more than 25% due to the cost advantages of lithium iron phosphate batteries. Low costs are a huge temptation for carmakers.
Of course, in addition to the price, batteries in all aspects of the existence of “hard injury.” As mentioned above, the blade battery has done a lot of work to overcome material defects, so that lithium iron phosphate can reach the same parameters as the teratosis lithium battery. The lithium phosphate version of Model 3 may also surprise the industry.
Sun Huajun mentioned that in the past, the entire industry has been pushing the three-way material, in the process of pushing one material, may be another material not so good. Perhaps this opportunity will really make people realize that there are no absolute “winners” in the battery technology route.