On December 18, BYD held a "old news" conference in Beijing, about 800V and charging technology for new energy vehicles. Why is it called "old news"?Because of the technology released, BYD has been mass-produced as early as 8 years ago, but everyone doesn't know. When others use "800V" as a new technology trump card publicity point, BYD's press conference is not only a positive position for China's new energy technology leader, but also a little "Versailles" meaning.
In the early stage of the development of new energy vehicles, the industry is generally faced with three nos: one no charging technology, two no charging infrastructure, and three no charging standards. In order to solve these development problems, BYD took the lead in achieving a breakthrough in charging technology from 0 to 1 through technology self-development. At the vehicle end and pile end, BYD has developed its own AC and DC charging technologies in the household and public sectors, providing a reference model for the national standard AC and DC charging standards, and even becoming the first batch of Chinese electric vehicle charging standard drafting units.
Eight years ago, 800V was the world's first.
As we all know, the higher the voltage, the higher the transmission efficiency of electric energy, such as high-voltage grid transmission, and the principle is the same for new energy vehicles. BYD started the technology research and development and layout of the high-voltage platform for new energy vehicles early, and took the lead in achieving a breakthrough in 2015, the world's first 800V high-voltage platform for passenger cars, which was installed on models such as Qin EV (2015 model) and Tang DM (2015 model).
With this technology, BYD models have achieved a shocking acceleration of 4 seconds, with a pure electric range of 450km and a fast charging power of 60kW. These performance, which was unconventional at the time, were made possible by the 800V high-voltage platform technology. Looking back now, BYD was definitely far ahead in the industry at that time.
Add "plug-in" for the charging infrastructure, boost + double gun.
Although BYD launched high-voltage models, it was difficult for the public charging network to popularize high-voltage piles at that time. At that time, 95% of the domestic low-voltage piles below 500V were incompatible with the charging of high-voltage models, which affected the charging efficiency. In order to solve this problem, BYD decided to develop a charging infrastructure "plug-in".
The first "plug-in" - boost: BYD's world's first booster charging technology completely realizes the compatibility of vehicle piles and fully adapts to all DC charging piles. This is also a major reason for the high DC charging efficiency of BYD models in the early stage of the popularization of new energy vehicles.
With the upgrading and iteration of the charging network, the number of high-voltage piles has gradually increased, and the factor limiting the charging power has become the charging current. At present, only 2% of public overcharging piles with currents exceeding 300A are available, but low-current fast charging piles are very popular.
The second "plug-in" - upflow: BYD launched the world's first dual-gun supercharging technology for passenger cars, so that ordinary public fast charging piles can also achieve the charging power of supercharging piles. Taking the DENZA N7 as an example, the maximum power of dual-gun overcharging can reach 230kW, and the public fast charging pile can be charged for 350 kilometers in 15 minutes.
A "good horse" worthy of a "good saddle" - battery thermal management technology.
The ultra-fast charging experience is not currently a "necessary condition" for new energy vehicles. BYD's ultra-fast charging technology can be regarded as a "good saddle" with great efforts, but if there is no "good horse", it will not win the new energy technology competition in the end, and battery thermal management technology is the key.
Because the uplift technology is more stringent for battery thermal management, BYD pioneered the world's first composite direct cooling technology, through the design of straight cold plates on both sides of the battery, as well as two sets of independent refrigerant control systems, and carried out a compensating runner design, the battery cooling area increased by 100%, and the heat exchange capacity increased by more than 85%. This ensures that the system can control the temperature of the battery during high-power charging, so that it can be charged quickly and safely.
The recent cold wave is estimated to be deeply experienced, the battery of electric vehicles is also afraid of cold, which will reduce battery performance and slow down the charging speed, and battery thermal management should not only dissipate heat but also heat. BYD has launched a full-scene intelligent pulse self-heating technology to achieve fast charging of cold cars at extremely low temperatures. In the extremely cold condition of -30, taking the DENZA N7 as an example, the all-scenario intelligent pulse self-heating technology increases the battery heating rate by 230% compared with the traditional solution, and reduces the battery full charge time by 30%. Not only can it be self-heating when charging, but it can also intelligently start the self-heating technology in the parking and driving states to ensure the performance of the vehicle at extremely low temperatures.
Through 20 years of technical accumulation, BYD has ushered in today's "thick accumulation". Although we are pleased with BYD's achievements in winning the world's new energy "first brother", we should also admire BYD's persistence and persistence in technological innovation when everyone doubted the future prospects of electric vehicles. 8 years ago, BYD's successful mass production of 800V technology is a solid step, and then the boost, double gun, and the recent Yun Yuan, Yi Sifang, etc., will leave their own footprints in the development of new energy vehicle technology. We also hope that more Chinese car companies will be down-to-earth, step by step, and eventually move to a higher stage in the world.