BYD Hiace 07EV was launched, Denza Z9 GT plug-in hybrid version completed the declaration of the Ministry of Industry and Information Technology, and BYD, which brushed down 3 million units last year, is still accelerating the "explosion". In addition to the continuous enrichment of new car categories, its electrification technology is also accelerating iteration. With the launch of the Hiace 07EV, the BYD e platform 3.0 EVO has also officially landed. In addition to the technical support for the new cars on the market, the significance of the platform lies in the impact on the product strength of BYD's future models.
Fast charging does not pick the charging pile, charging to 100% in 30 minutes?
Since the application of dual-gun charging technology, BYD has actually conveyed technical ideas that are closer to the actual car use scene. However, in the environment where many car companies roll up 800V high-voltage fast charging, it is obviously impractical not to follow up. The 3.0 Evo of the BYD e-platform achieves a fast charging speed of 800V high-voltage level through boosting. Taking the BYD Hiace 07EV as an example, it can achieve a charging speed of 240kW when running at full fast charging power. However, the speed at which the battery can be charged from 10% to 80% in about 25 minutes seems to be only decent in horizontal comparison.
Of course, BYD still has dual-gun charging technology. On this basis, if the full charging power is achieved, it can reach the level of 500 kW, which means that the charging speed of 10-80% can be shortened to about 12 minutes. In addition, the e-platform 3.0 EVO offers the option to boost the current in addition to boost technology. Since power is positively correlated with both voltage and current. Then, in the charging condition with limited voltage, increasing the current becomes another option to maintain the charging voltage.
In addition to the charging speed of the battery health zone (charging up to 80%), the ePlatform 3.0 Evo also involves a speed increase beyond 80% of the battery. It is well known that the charging speed of the battery is greatly reduced after it has been charged to about 80%. This is not only true for electric vehicles with large batteries, but also for smartphones. Because when the battery is charged to the later stage, most of the charged power is consumed on side reactions such as heating. The way to overcome this phenomenon is to add negative pulses to the charging process.
That is, the method of intermittent stop charge or even reverse discharge is adopted to make the chemical reaction generated by the high-speed charging of the battery have time to be resynthesized and absorbed, reduce the polarization phenomenon, and release the internal pressure of the battery, so that it can effectively absorb more power in the next round of charging. According to BYD's official data, the Hiace 07EV with e-platform 3.0 Evo technology will have its end charging time shortened from 30 minutes to 18 minutes.
To sum up, on the charging side, the e-platform 3.0 EVO technology not only adheres to the technical route of dual-gun fast charging, but also follows the technical trend of 800V fast charging. Moreover, in order to meet the charging needs of 800V, in addition to the step-up route, the step-up operation is also added. In summary, BYD models have further strengthened their adaptability to charging piles and different charging environments while realizing fast charging. In addition, the enhancement of the charging speed at the end can mainly eliminate the range anxiety of the vehicle when driving long distances. After all, even if the vehicle only has 10% battery left, it only takes 30 minutes for the Shanghai Lion 07EV to fully recover 100% of its battery life (in the case of two guns).
004.2 seconds is just a giveaway, how many motors do you want to match in the future?
Charging is faster, and naturally the motor speed of the new platform will be higher, and thus the performance potential will be higher. The logic of this set of technology is that fast charging itself must rely on the iteration of semiconductor materials. Under the development trend of high integration, the charging unit and the drive unit can be regarded as unified. To take the simplest example, where the charging port is, it basically means whether the vehicle is using a rear-wheel drive or front-wheel drive platform. This allows for maximum savings in high-voltage wiring harnesses and at the same time increases space efficiency.
Returning to the BYD Hiace 07 EV, it is equipped with a drive motor with a maximum speed of 23,000 rpm, which is partly due to this. Of course, the use of high-voltage SiC materials is only necessary to meet the requirements of high-speed motors, but it is not the only condition. After all, Huawei and Xiaomi have previously come up with their own mass-produced motors with a speed of more than 20,000 rpm. The full groove rate of the winding, the structural strength of the rotor, the limit of the motor material, etc., can all affect the result of the final limit speed. In this regard, the operation of mainstream car companies is basically the same. For example, the optimized design, the use of silicon steel materials and so on. Tesla's carbon fiber technology solution is destined to fail to become mainstream. After all, there is too much pressure on cost control. In the end, after more than 20,000 revolutions, I am afraid that the performance is still the ability to control the details of technical processing.
Of course, the pursuit of extreme speed is an important way to show technical prowess. But for ordinary consumers, perhaps what they need to understand is what the new technology can bring. Performance is of course the most intuitive, and in the absence of a gearbox, the motor speed can be equated with extreme performance under certain conditions. For example, the BYD Hiace 07EV has a fastest 000 acceleration time of 4.2 seconds, and even the single-motor version can reach 6.7 seconds. You know, this is a mid-size SUV with a curb weight of about 2.2 tons (single-motor version). Behind the performance, the trend of miniaturization of motors may be the more important part.
This can be illustrated with the help of the newly declared Denza Z9 GT plug-in hybrid version, which can meet the layout of three motors under the PHEV structure. The length of the car itself, which is close to 5.2 meters, and the width of the car is nearly 2 meters, of course, the basis for such a layout. However, the engine of the new car adopts a 2.0T displacement, and it is not a series structure of extended range, but a plug-in hybrid that can be connected in series and parallel. In this way, the layout of the front 200kW single motor and the rear dual 220kW drive motor can also be realized, and the size of the motor itself and the heat dissipation efficiency of the electric drive system will inevitably reach a high level. Obviously, the above technical points are consistent with the e-platform 3.0 Evo.
Therefore, we can find that the high speed and high power of a single motor are only the most basic appearance. The high integration, high efficiency and miniaturization of the motor are the essence. On this basis, the motor layout of new energy vehicles can be more flexible, so as to achieve more precise control of individual wheels. Combined with various chassis technologies, including Yunyuan technology, as well as the accumulation of intelligent driving hardware and algorithms. A set of product ideas that combine intelligence, active chassis, high performance, and low energy consumption has surfaced. In fact, this may be the technical direction that mainstream new energy vehicle companies, including BYD, want to achieve.