As China's new energy vehicle industry enters a period of comprehensive market expansion, the main contradiction in the promotion and application of new energy vehicles has also shifted from "range anxiety" to "energy supplement anxiety". On December 18, BYD held a full-scene high-efficiency charging technology communication meeting in Beijing to introduce the innovation process of charging technology. The picture shows BYD's dual-gun overcharging technology.
Since the popularization of new energy vehicles in China, "difficult charging" and "slow charging" have always been the most concerned problems from all walks of life. As China's new energy vehicle industry enters a period of comprehensive market expansion, the main contradiction in the promotion and application of new energy vehicles has also shifted from "range anxiety" to "energy supplement anxiety". How to further improve the charging efficiency, especially in the northern region with cold winter, has become a must-answer question for major new energy vehicle brands.
On December 18, BYD held a full-scene efficient charging technology communication meeting in Beijing, showing a lot of "black technology".
Charging has always been the pain point that new energy users are most concerned about, and it is also a key area of BYD's technological innovation and R&D investment. The relevant person in charge of BYD said that in the early stage of the popularization of new energy vehicles, in order to break through the technical ceilings of power, battery life, charging and other aspects, and create a more extreme electric vehicle experience for users, it is imperative to make technological breakthroughs in the high-voltage of electric vehicles.
According to him, in the early stage of the development of new energy vehicles, the industry is generally facing the "three no dilemma": first, no charging technology;Second, there is no charging infrastructure;Third, there is no charging standard. In order to solve these development problems, BYD took the lead in achieving a breakthrough in charging technology from 0 to 1, opening a comprehensive innovation road of charging technology, and self-developed AC and DC charging technology in the household and public fields at the vehicle end and pile end, providing a reference model for the national standard AC and DC charging standards, and also becoming the first batch of Chinese electric vehicle charging standard drafting units.
According to reports, BYD took the lead in achieving a breakthrough in 2015 with 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). This technology can accelerate to 100 kilometers in 4 seconds, the pure electric range can reach 450 km, and the fast charging power can be increased to 60 kW, improving the user experience in all aspects.
It is worth mentioning that although the charging power of electric vehicles has been greatly improved by high-voltage models, 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 pioneered the world's first step-up charging technology, which completely realizes the compatibility of vehicle piles, so that the vehicle can be fully adapted to all DC charging piles.
The person in charge said that with 20 years of technical accumulation and deep skills, BYD continues to innovate and invest in R&D to build a charging technology system that is more in line with the current national conditions. ”
For example, he said that at present, domestic supercharging piles are still relatively scarce, but the popularity of fast charging piles is relatively large, "Therefore, instead of letting users compete for a very small number of supercharging piles, it is better to make full use of the existing public fast charging pile resources of more than 1 million."
According to reports, BYD has launched the world's first dual-gun supercharging technology for passenger cars, so that the public fast charging pile can be used to the fullest, so that the charging efficiency is comparable to that of the supercharging pile. Taking the DENZA N7 as an example, the maximum power of dual-gun overcharging can reach 230kW. Even on public fast charging piles, when using the dual-gun overcharging function, the car can be charged for 350 kilometers in 15 minutes.
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, the compensating runner design has been carried out, the cooling area of the battery has been increased by 100%, and the heat exchange capacity has been increased by more than 85%, escorting the safety of users with supercharging.
In response to the problems of cold winter and low charging efficiency in northern China, BYD has developed a full-scene intelligent pulse self-heating technology, which has realized "cold car fast charging" in an extremely low temperature environment for the first time.
Taking the DENZA N7 as an example, under extremely cold conditions of minus 30 degrees Celsius, the all-scenario intelligent pulse self-heating technology can increase the heating rate of the battery by 230% and shorten the charging time by 30%. At the same time, in the state of vehicle parking and driving, the intelligent start self-heating technology can be started at any time to ensure the performance of the vehicle in a low temperature environment, so that new energy vehicle users in the north can also avoid the pain points of the past in winter.
According to data released by the China Electric Vehicle Charging Infrastructure Promotion Alliance, as of November 2023, the number of charging infrastructure in China has reached 82640,000 units, an increase of 670%。Among them, the number of public charging infrastructure reached 26260,000 units, an increase of 517%。
Some analysts believe that the new energy vehicle industry is ushering in a critical stage from quantitative change to qualitative change, and technical details including charging efficiency need to continue to improve. As a leader in new energy vehicles, BYD has seized the huge opportunities released by the new development concept in the past ten years, embraced electrification with the upstream and downstream industry chains, and embarked on a path of green innovation and development step by step.
As Wang Chuanfu, chairman and president of BYD Co., Ltd., said, the larger the scale of the enterprise, the heavier the responsibility on its shoulders. He said that BYD will work together with the whole industry, shoulder the responsibility and mission entrusted by the times, unswervingly embrace the wave of electrification, accelerate the modernization of China's auto industry, provide a Chinese model for the transformation of the global auto industry, and contribute China's strength to the green recovery of the global economy.
China Youth Daily, China Youth Network Intern Reporter Wang Zhiyuan Reporter Xu Yajie **China Youth Daily.
*: China Youth Daily Travel Weekly.