At present, the development of new energy vehicle industry is in full swing, but no matter how exquisite and large the interior is, the performance of power battery system is the most fundamental standard to measure a new energy vehicle. In this regard, the two aspects that consumers value most are safety and endurance. Although manufacturers have created many concepts and terms to publicize and bombard consumers, from the most basic core batteries, the current mass-produced automobile power batteries are divided into ternary lithium batteries and lithium iron phosphate batteries.

In contrast, ternary lithium batteries have better comprehensive properties such as energy density and activity, so they can provide vehicles with longer battery life and better low-temperature environmental performance, and the production difficulty and cost are also higher. Although the energy density of lithium iron phosphate battery is not as good as the former, it shows better stability and durability under extreme conditions such as high temperature and severe impact, which is conducive to cost control.

So, can't the "high performance" and "safety" of power batteries really have both? Major car companies have tried their best to seek breakthroughs. Today, Jiangge will take stock of several latest battery technologies on the market and see what these colorful concepts represent.

1. BYD blade battery

Type: lithium iron phosphate battery

BYD's famous blade battery is essentially a lithium iron phosphate battery. However, by redesigning the shape and layout of battery cells and improving the production process, BYD has made the blade battery look very thin, but its capacity has been greatly improved.

Structurally, the square battery of the blade battery is flat and looks like a pile of neatly arranged paper cutters. Each blade is divided into a plurality of accommodating cavities, and a battery is arranged in each accommodating cavity. Under the lamination process, the space utilization rate of the blade battery is improved, the batteries do not interfere with each other, and the safety is also enhanced.

Through the "acupuncture test" and "heavy truck rolling test", BYD leaf battery shows good structural strength and anti-collision performance. It not only improves the energy density, but also continues the safety advantage of lithium iron phosphate battery. When the blade battery was launched, it was once in the limelight, and BYD also advertised that "safety is the biggest luxury of electric vehicles".

However, although the blade battery did not catch fire in the acupuncture test, BYD frequently reported several cases of spontaneous combustion of its models, which inevitably affected its technical image. BYD still needs to investigate the cause of the accident as soon as possible, explain it to consumers and eliminate doubts.

2. Tesla 4680 battery

Type: ternary lithium battery

Tesla's 4680 battery is cylindrical, and the material still uses ternary anode. The battery pack structure adopts CTC scheme, and the cylindrical cells are directly arranged on the car body to form a battery compartment. In short, the increase in the diameter of the 4680 battery reduces the manufacturing and assembly costs. Due to the adoption of electrodeless ear technology, the internal resistance of the battery is reduced, and the safety and fast charging performance are improved.

Recently, the overseas version of Tesla Model Y released a model with a 4680 battery, but surprisingly, the battery capacity of the new car is said to be only 50KWh and the cruising range is only 450 kilometers. When the battery density increases, you can choose to increase the battery life or reduce the weight of the whole vehicle. Tesla chose the latter.

Perhaps the greatest significance of 4680 battery for Tesla lies in saving costs and improving fast charging performance, thus contributing to the "promotion" of automobiles. According to the official explanation of Tesla, Tesla Model Y adopts the combination of parameters, performance and price of the new battery, which has a low threshold and is suitable for most users. For consumers with stronger performance requirements, you can choose Model Y Performance Edition or Long Life Edition.

However, the 4680 battery is not dominant in space occupation. Contrary to the square battery commonly used by domestic battery manufacturers, the future expansion space seems to be limited, relying more on Tesla's advanced battery management algorithm.

3. Contemporary Ampere Technology Co., Ltd. Kirin Battery

Type: ternary lithium/lithium iron phosphate battery

The Kirin battery of contemporary Amperex Technology Co., Ltd. has not changed the battery material, but has further improved the battery pack integration process, which is essentially the application of CTP 3.0 technology.

Compared with the traditional "battery-module-battery pack" three-level structure, CTP technology cancels the module link and directly integrates the battery into the battery pack or a larger module, but retains the battery upper cover plate and tray, and integrates the transverse and longitudinal beams, water cooling plates and heat insulation pads into a multifunctional elastic interlayer, which ultimately achieves the effects of reducing cost, improving energy density and effectively preventing thermal runaway.

According to the official claim of contemporary Amperex Technology Co., Ltd., the volume utilization rate of Kirin battery has exceeded 72%, and the energy density can reach 255Wh/kg. Through the world's first battery cooling technology, it can also realize the functions of fast hot start in 5 minutes and fast charging in 10 minutes. This improved battery grouping technology is suitable for both lithium iron phosphate batteries and ternary lithium batteries, which helps them to improve their shortcomings and further balance their comprehensive performance. Perhaps this is the pattern of contemporary Amp Technology Co., Ltd. as the "boss".

4. GAC Aian magazine battery

Type: ternary lithium/lithium iron phosphate battery

Some time ago, at the second China Automobile Fengyun Festival, CCTV awarded the Power Battery Technology Award to Guangzhou Automobile Aian Power Battery Technology Group, which made more people pay attention to the strength of magazine batteries. Similar to Kirin battery, GAC Aian, a magazine battery system safety technology, is open to both ternary lithium batteries and lithium iron phosphate batteries, and it is also a brand-new power battery system safety technology in essence.

The reason for saying "system safety technology" is that the magazine battery has been optimized from the battery core, to the battery management system, to the rapid cooling system. In the acupuncture test, both the ternary lithium battery and the lithium iron phosphate battery using the safety technology of magazine system realized that the whole package did not catch fire, which refreshed the safety level of ternary lithium battery. Therefore, the arrival of magazine battery is also regarded as a big challenge to BYD blade battery. In any case, it is gratifying to see that car companies are "involved" in power battery technology.

As can be seen from the above battery technologies, the current battery disputes are actually focused on the shape and process innovation of battery packs. It is worth mentioning that before BYD released the Seal model, its battery pack adopted CTB technology, which combined the battery pack with the body chassis and the body bottom plate with the battery cover, further saving space.

summary

Tesla, Zero Run Support CTC, BYD Bet CTB, and Contemporary Ampere Technology Development CTP…… ......................................................................................................................................................

Sometimes science and technology develop with each passing day, but some fundamental technological changes are not achieved overnight. After that, what kind of breakthrough will be made in power battery technology, and where will the development of new energy automobile industry go? It is worth looking forward to! Which of the above four battery technologies do you think is the strongest? Welcome to pay attention to "the automobile territory has no borders", leave a message in the comment area below and share your views.