On December 28th, Xiaomi's car manufacturing that has been held back for many years finally ushered in a milestone technology product launch conference, Lei Jun introduced in detail the avant-garde technology of Xiaomi cars in the field of new energy vehicles at the press conference, and showed the innovative design of the first C-class pure electric car - SU7, according to the plan, this car will be sold in 2024.
In this issue, let's talk about what "big moves" does "Rebus" hold back in the field of three major pieces and three electric technologies?
The first sedan with the Moderna architecture developed in-house
It's a world-renowned technology company, and Xiaomi will naturally not use the "oil to electricity" or "procurement platform" scheme to make cars, for this reason, Xiaomi has specially developed the Moderna technical architecture in the full stack, and this Xiaomi Su7 is the first product of the platform.
First of all, in terms of size data, the length, width and height of the car are 4997 1963 1455mm, and the wheelbase is 3000mm, which fully meets the standard of the C-class car, and presents a four-door coupe with a wide-body low-lying shape, and the color scheme provides three kinds of bay blue, elegant gray and olive green. In terms of details, including the teardrop-shaped "rice" headlights, halo-shaped through-type taillights, 175° ripple curved wheel eyebrows, semi-hidden door handles and other designs will become Xiaomi's family language.
At the same time, SU7 has also made great efforts in the aerodynamic optimization of the body, not only has a conventional design such as a push-down front cover, a slip-back roof, and front and rear fender air curtains, but also makes the lidar module on the roof into a "pebble" shape, and the exterior rearview mirror is also a frameless design with low wind resistance (the national standard does not allow electronic exterior mirrors), which makes the wind resistance coefficient of the whole vehicle be reduced to 0195cd。Of course, high-end goods such as frameless doors and electric rear wings are also indispensable.
Interior part, the vehicle cockpit is still the popular intelligent, digital design ideas, the theme color is Milky Way gray, twilight red, obsidian black three, and into the dynamic atmosphere lights, anti-ultraviolet panoramic canopy, Nappa leather seats and other advanced elements, in addition to 25 speakers of Dolby surround sound system (including two headrest audio), a sense of technology, luxury full.
The above are basic operations for expensive luxury cars, and of course, Xiaomi has also added a lot of innovative elements to this SU7. For example, 7The 1-inch instrument panel can be automatically flipped when turned on, and the sense of ceremony is full;The steering wheel not only has an electronic pocket gear, but also adds ejection start and boost mode buttons to the left and right to create a stronger combat atmosphere.
The simple intelligent cockpit will generally do "subtraction" on the physical buttons, and this car is the same, but in order to reflect its convenience and sense of value, the core functions such as air conditioning control, electric rear wing, and air suspension are still designed with physical buttons, and for owners who are more accustomed to operating physical buttons, the car also adopts a magnetic physical keyboard plug-in scheme under the central control, which can be said to be quite intimate.
In terms of intelligent interaction, the SU7 is at 16The 1-inch 3K central control screen has a built-in Qualcomm Snapdragon 8295 chip, using a surging OS car machine system, as well as a 56-inch HUD head-up display, and the backup can also be hung with a tablet, which can be automatically connected without induction, and realize the control of air conditioning, seats, and more.
Large die-cast body intelligent chassis technology
The above are all focused on the product level that can be seen and touched, and whether a car is good or bad, the key is to look at the body chassis and three-electric technology.
First of all, the body part, Xiaomi car manufacturing adopts industry-leading super die-casting equipment, the front cabin triangular beam of the vehicle is "18 in 1" design, and the rear floor of the tail is "72 in 1", all through integrated die-casting to reduce welding and riveting processes, reduce cycles, and improve strength. For reference, the die-casting machine in Tesla's Shanghai factory can provide 6000t of pressure, while the die-casting machine of Xiaomi Auto can achieve up to 9100t.
Of course, the key parts of the crew compartment pillar and the floor battery pack are still made of steel, of which the proportion of steel above high strength is 901%, the strength of hot-stamping steel reaches 2000MPa, which also makes the whole vehicle reach 51000Nm DEG torsional rigidity, even surpassing the Rolls-Royce Phantom of the luxury car ceiling and the Bugatti Veyron of the supercar ceiling.
At the same time, the battery pack located on the floor also adopts a CTB integrated design with the body, which is more common in the current pure electric new cars, but it can do 778% volumetric efficiency and a maximum capacity of 132kWh are rare. In addition, thanks to a die-cast front beam, integrated electric drive, oblique radiator design, etc., this Xiaomi SU7 has the largest 105L front trunk in its class.
As for the chassis part, the double wishbone front overhang + five-link rear overhang is already a basic operation for the forward self-developed Xiaomi new energy platform.
On this basis, Xiaomi Auto has also developed its own intelligent chassis system like AITO Wenjie and NIO, and on this SU7, it will support CDC adaptive electromagnetic damper and active air damping system, with intelligent adaptive dynamic control system, which not only supports soft and hard, height adjustment, but also can be matched with active seat support to achieve a comfortable experience in all scenes.
As for the braking system, the car uses Brembo four-piston calipers on the front wheels, and is equipped with Bosch DPB brakes and ESP100 stability system, including motor reverse drive, with quadruple redundant braking system, 100km h-0 braking distance of only 333m。Steering part, steer-by-wire is still the basic operation, the minimum turning radius of the car is only 57m。
In addition, the new car also supports custom driving modes, including chassis, steering, brakes, power, and energy**, including a total of 10 categories of custom adjustments, truly allowing users and the car to achieve a "human-vehicle" control experience.
800V voltage platform Kirin battery technology
The Xiaomi Su7 has two configurations, the standard version and the MAX version, which use two different three-electric systems.
The standard version uses a lithium iron phosphate material system, which is provided by BYD's subsidiary Fodi Power, and uses a 400V voltage platform with a battery capacity of 736kWh, with a rear-mounted 220kW 400nm permanent magnet synchronous motor, CLTC pure electric range of 628km. This indicator is not outstanding in the industry, but it is estimated that it will be much cheaper.
The powerful thing is the MAX version, the car uses a high-voltage electrical system of up to 871V, equipped with a Kirin battery provided by CATL, using a ternary lithium material system, with a capacity of 101kWh, even if it is a dual-motor four-wheel drive version, its CLTC pure electric range can reach 800km. In addition, when using a fast charging pile that meets the needs of high-power fast charging, this battery pack can obtain an ultra-long range of 220km after charging for 5 minutes.
In terms of battery safety, this battery pack has 78 cubic meters of active liquid cooling area, and support electric heating, heat pump air conditioning, electric drive water cooling using triple heating system, the fastest speed to achieve "warm electricity" and "warm cabin". At the same time, the cell unit (square box) also adopts an innovative inverted design, which can maximize the heat release to the ground in the face of thermal runaway, and minimize the harm to the battery cells next door and the cockpit.
●2.The electric drive performance of the 78S NOA intelligent driving
When it comes to Xiaomi mobile phones, the first thing that comes to our mind is the exaggerated "running score" data, and this Xiaomi Su7 is also full at the performance level, especially the MAX version with dual motor drive.
The version features a highly integrated front and rear electric drive unit with a peak speed of an astonishing 27,200 rpm, which is the basis for even higher top speeds, while the electric motor has 10With a power density of 14kW kg, the powerful performance will surpass that of similar models of Porsche and Tesla.
In terms of book data, the comprehensive power of the MAX version reaches 495kW and the maximum torque is 838Nm, which is 4 in the era of fuel vehiclesThe 0-liter V8 twin-turbo engine is at the level and benefits from the electric drive unit 9811% motor peak efficiency, 9985% electronically controlled peak efficiency, its acceleration performance will be even more outrageous.
Specific to the performance level, the car 0-100km h acceleration time is only 2In 78s, the 0-200km h acceleration time is only 1067s, the top speed is extended to 265km h. Of course, at present, the high-end pure electric cars of independent brands are very volatile in this regard, and although this SU7 is the first echelon, it is far from being the strongest.
As for the intelligent driving solution, Xiaomi Auto adopts full-stack self-developed intelligent driving technology, has two NVDIA Drive Orin chips, and is also equipped with a roof lidar that can irradiate up to 200mm, in addition to visual cameras, millimeter-wave radar, ultrasonic radar and other rich body sensors, and the hardware level is also directly full.
At the software level, adaptive cruise, lane change assistance, traffic sign recognition is already a basic operation, the car also supports automatic valet parking, remote summoning of the owner, and the application of two-in-one end-to-end algorithm logic to achieve dynamic decision-making adjustment of automatic driving, even if it is an ultra-narrow mechanical lifting parking space, it can also be parked. Lei Jun also said that Xiaomi Auto will open a NOA city pilot system in 100 cities in 2024.
Summary:
Judging from the content of the press conference, like Xiaomi mobile phones, Xiaomi's car manufacturing also presents a state of "never lost in data", especially in the three value levels of electric technology, intelligent cockpit, and driving assistance, which have reached the first echelon of the industry. As for the "degree of restoration" at the product experience level, Xiaomi is still optimizing the details of the car, and we can pay attention to the performance of the actual car after it is launched in a few months.