In the initial stage of the development of new energy vehicles, the entire industry is facing unprecedented challenges. First of all, the lack of charging technology is a major problem;Secondly, the lack of charging infrastructure has also brought difficulties to the development of the industryIn addition, the formulation of charging standards still needs to be further improved. Although we now enjoy the convenience and advantages brought by new energy vehicles, we must not forget the hardships and difficulties experienced by those R&D personnel in the initial stage. BYD not only explores in-depth in the field of products, but also actively seeks solutions for scientific research and technology.
At BYD's all-scenario high-efficiency charging technology communication meeting, we witnessed many eye-catching innovations. The 800V high-voltage platform technology has been 2-3 times ahead of the industry, and the dual-gun supercharging technology has made the public charging pile instantly upgraded to a super charging pile. The composite direct cooling technology ensures fast and stable charging, while the pulsed self-heating technology eliminates the concerns of charging users in the low temperature environment in the north. Despite the company's low profile, the rapid development of its charging technology is evident.
In 2022, the 800V high-voltage platform technology was hailed as a major breakthrough in charging technology, and many automakers began to launch and actively promote this technology, which is regarded as an important starting point for this technology. It is worth noting that although the Porsche Taycan was the first model to unveil this technology back in 2019, its advantages have now been forgotten. In 2015, BYD achieved the world's first breakthrough in the 800V high-voltage platform for passenger cars, and installed this technology on models such as Qin EV (2015 model) and Tang DM (2015 model).
During that period, many automakers were still using low-voltage charging systems, and this inconsistent approach not only affected the speed of charging, but also increased operating costs. In order to change this situation, BYD began to research step-up charging technology, and paid special attention to the compatibility of vehicles with charging piles. With this technology, they have successfully solved the problem of efficient charging and compatibility, and achieved full adaptation to all DC charging piles. At that time, the technology could already accelerate to 100 kilometers in just 4 seconds, the pure electric range reached 450 kilometers, and the fast charging power was increased to 60kw. However, at that time, there were no 800V supercharging piles.
With the popularization of 800V charging technology, car companies have begun to adopt this voltage to improve the charging efficiency and performance of vehicles. With the rapid development of this technology, charging piles are also constantly being updated, and more and more 800V super charging piles have begun to enter the market. Not to be outdone, BYD launched a super charging pile using the latest boost technology in 2022, achieving faster charging efficiency and higher compatibility, providing consumers with a more convenient and fast charging experience.
With the rapid development of new energy vehicles, especially the significant improvement of battery technology and vehicle energy consumption management, the endurance of electric vehicles is constantly increasing. However, existing public charging facilities are limited to a maximum charging current of 250 amps, which limits the charging power of electric vehicles. Currently, only 2% of public chargers have a charging capacity of more than 300 amps. In order to solve this problem, new energy vehicle companies have proposed two types of mainstream charging solutions: self-built supercharging piles and public fast charging piles. However, both options have certain limitations. The coverage of self-built supercharging piles is limited, and the construction period is longHowever, the current of public fast charging piles is limited by national standards, and the scope of improvement is limited. Therefore, a new charging scheme needs to be found to solve this problem.
In order to solve this problem, BYD innovatively proposed the "double gun supercharge" technology. This technology leverages an extensive network of public fast charging piles and uses a "upstream" scheme to improve charging efficiency. Moreover, this technology does not require any changes to the vehicle's hardware, and only two charging cables need to be plugged into the vehicle at the same time to significantly increase the charging current. This breaks through the national standard current limit for public fast charging piles, and can double the charging current up to 500 amps. Combined with the domestic mainstream 80-120 kW public fast charging pile network, the charging power can be greatly improved through the dual-gun overcharging technology.
The technology uses two separate charging circuits, A and B, which can work both independently and in tandem. Charging ports A and B are located on the left and right sides of the rear of the vehicle, respectively, showing a symmetrical layout. The intelligent vehicle can call the charging capacity of the second charging gun and flexibly adjust the charging current according to the actual demand, so as to double the charging capacity of the whole vehicle to obtain the best charging effect.
In the northern charging scenario, the biggest problem faced by the intelligent pulse self-heating technology is the temperature problem. Due to the slow temperature rise rate of the battery, the charging time at low temperature is increased by 1 to 2 times compared with normal temperature. This not only affects the dynamic performance of the vehicle, but also increases the cost of energy replenishment, including the time and economic cost of the user. In the low-SoC state of cold cars, the comprehensive cost of energy replenishment increases significantly. These factors have led to the penetration rate of new energy vehicles in South China exceeding 30%, while in Northeast China it is less than 10%.
In order to achieve better vehicle thermal management, the industry is exploring innovative ways to go beyond traditional external heating methods. Current research focuses on the development of more advanced battery heating technologies, especially internal heating methods. Among them, the most eye-catching technology is the battery pulse self-heating technology. This technology uses the high-voltage topology of the vehicle to generate a high-frequency pulse current between the battery and the electric drive. When the current flows in the battery at high frequency and alternating, the heat generated by the internal resistance causes the battery to heat up on its own. Compared with the external heating method, this method has a faster heating rate, a more uniform heating effect, and a higher heating efficiency. Compared with traditional solutions, the battery heating rate is increased by more than 230%.
Although BYD's charging system is relatively low-key, in stark contrast to its passenger car products, at this exchange meeting, we deeply experienced BYD's 20 years of technology accumulation and strong technical strength. BYD has been committed to innovation and invested a lot of R&D resources to build a charging technology system that is more in line with China's national conditions. The company's philosophy is not only to pursue fast charging, but also to improve the quality and user experience of the entire charging process. In the field of electric vehicles, we expect BYD to start a comprehensive innovation in charging technology with its technological innovation, convenient, efficient and reliable charging services in all scenarios.