After the rise of the concept of new energy, many traditional car companies have introduced hybrid or pure electric vehicles, but most of them are concept cars or a small number of cars, such as GM’s car-sized and planned mass production. There are very few companies in the car, especially the star models like Bolt and the hybrid models of the new Mai Rui Bao, making GM a star of new energy.
In the impression of the average person, it seems that pure electric seems to be Tesla. It is said that the hybrid seems to be Toyota. In fact, from the perspective of R&D strength, GM is even more at the expense of blood, and many technologies are unique. When I came to the north of Detroit, USA. After the battery lab of the General Motors Technology Center in Lun, it was discovered that GM had great ideas in the field of new energy, and there are many hybrid/pure electric models that can be expected next year.
There will be several new energy models listed next year.
GM's iconic model for new energy is the pure electric car Bolt unveiled at the North American Auto Show at the beginning of the year. In addition to it, several new cars will be launched next year, forming the vanguard of the GM's new energy.
Among them, Volt Reveal is also a GM star model. The next generation will have the endurance of 80KM in pure power and the total endurance of 675KM. The integrated fuel consumption of the extended program is 5.7L and the acceleration of 0-95KM/H is 8.4 seconds.
Volt's technology is also applied to the next generation of Mai Rui Bao. The hybrid version of Mai Rui Bao is equipped with a 1.8L engine, and the fuel consumption per 100 kilometers can be reduced to 5L.
What's more interesting is the hybrid Cadillac CT6, which is designed for the Chinese market. It has a pure electric life of 60 kilometers and a fuel consumption of 100 kilometers as low as 2L. However, the CT6 is more attractive. Exterior.
The last thing to mention is the Bolt, a pure electric vehicle that was unveiled at the North American Auto Show and the Shanghai Auto Show this year. Its main specifications have been disclosed. The 321-kilometer cruising range and the price of 30,000 US dollars have become the popular two for electric vehicles. The big selling point makes people think that the new energy car is not so far away, and it has become a representative of the universal family in the field of pure electric.
Although the positioning, performance and driving styles of these new energy vehicles are different, one thing is the same, that is, all of their battery parts are produced in this technical laboratory in Warren, North Detroit. The future "Drive Center" of General Motors.
What is the safety and efficiency of the battery?
Although many people have not driven new energy vehicles, they have many concerns about their safety, and most of the fears of the legend can be eliminated in this laboratory.
The first is the charge and discharge life problem that most people are worried about. The laboratory has a special link to simulate different climatic conditions, repeatedly charging and discharging between -68 and 85 °C. According to the engineer, this charging and discharging process simulates the user. The daily car use situation is not simply full and light, but takes into account the real car data. Although the battery life is not disclosed, the official official data shows that 80% of the users have not experienced any degradation in the battery within three years, in contrast, the life of the ordinary digital lithium battery is only about 300 times. The number of charge and discharge cycles.
Secondly, the durability and safety of the battery. In the laboratory, GM also simulates the vibrations and collisions that the battery needs to withstand in daily driving. Even in the three parts of the battery, the battery pack and the whole vehicle, the battery is tested. Damage, even the stability of the shooting through the circumstances to ensure the safety of the vehicle and the human body in this extreme environment.
In terms of battery density, lithium batteries are currently recognized as a better solution. Compared with nickel-metal hydride batteries, lithium batteries are only half the weight of nickel-hydrogen batteries in the same 340WH. The lead battery used is only one-fifth of its weight, so although the lithium battery density is definitely not as good as the traditional fuel, it is also a better solution.
Exclusively decrypt the battery system of Bolt EV
Contrary to the popularity of the Panasonic 18650 battery used by the Tesla Model S, the battery system of the Chevrolet Bolt EV, which is also a pure electric star model, is unknown, although the media has already learned the origin of this pure electric car, but it is fresh. A reporter can walk in here, and this time we visited the Universal Battery Lab and we decrypted the difference at the first time.
First of all, the shape is completely different. It is well known that the Panasonic 18650 is a cylindrical can, which is slightly larger than the ordinary 5th battery, but the shape is exactly the same. The disassembly shows that the Model S uses a "scarely" 7000-plus 18650 battery, while the Bolt EV is How to do it?
Obviously the world is not only Panasonic, the 18650 is not all good.
The Bolt EV is very similar to the first and second generation Volt, using the LG "pocket battery", which is the size and shape of a food vacuum bag, and only used 288 and 196 on the two generations of Volt models, obviously efficiency A lot higher.
Engineers at the General Battery Lab explained to me that this bag-shaped battery has several advantages over the 18650. First, the cooling effect is better, the temperature control is more uniform, and the temperature at each point is easily reached. Then I I saw its cooling system in the lab, like the printed circuit of the motherboard, in every part of the bag-shaped battery, the general engineer used the water cooling method, because the flat bag battery has a larger area, Therefore, the printed circuit generally has a water-cooled pipeline, which is easier to temperature control. Secondly, it has a longer life and is more reliable, and is relatively stable under extreme conditions.
When it comes to stability, Tesla fans may like to tell a story, that is, the stability of the Panasonic 18650, even better than the instrument used to detect it, but I learned that the LG battery used by GM, every 100 Only two of them are not up to standard, and they are equally important in this respect.
In the dismantling of the laboratory, I also saw the temperature control system of the whole battery pack. In addition to water cooling, the thermal management in winter is also a big challenge. For this reason, the general use of 1.6KW charging heating method makes the whole vehicle in winter. The charging is faster and the loss is small, and the temperature difference of each battery is controlled within the range of 2 °C.
Although some key details such as charging time and charging method have not been disclosed, the unsold Bolt EV is behind the 321KM cruising range and the 3W USD price. It is a mature battery solution, solid workmanship and rigorous attitude. These are especially important for a new energy car, because for new things, people always use a magnifying glass to see every advantage and disadvantage of you.
Ningbo Autrends International Trade Co.,Ltd. , https://www.mosvape.com