With the rising penetration rate of new energy vehicles in China, users have put forward higher requirements for efficient energy replenishment scenarios
On December 26, BYD introduced at a technical communication meeting that it has built an all-round charging system ahead of time through five technologies: 800V high-voltage platform, booster fast charging, dual-gun supercharging, composite direct cooling, and pulse self-heating. BYD has been solving the energy replenishment problems encountered by users in real use through technological innovation for many years, and also elaborated on how to create faster, safer and more convenient full-scene efficient energy replenishment technology for users.
At present, charging piles are mainly divided into two categories: self-built pile overcharging scheme and public pile fast charging scheme. Due to the limited coverage of supercharging piles and the long construction period, it is difficult for the former to be truly scaled up, and the maximum number of self-built piles of car companies is still at the scale of 10,000. However, the million-level network of public charging piles is limited by the national standard, and the scope of power improvement is very limited. Based on this background, BYD pioneered the "Passenger Car Dual-Gun Overcharging" technology: the passenger car dual-gun overcharging technology makes full use of the huge public fast charging pile ecology to improve the high-power fast charging efficiency of public piles with the "upflow" scheme.
The dual-gun overcharging technology for passenger cars does not rely on self-built supercharging piles, and adapts to domestic public fast charging piles, without changing the hardware, the vehicle can plug in two charging guns at the same time, greatly increasing the charging current, making the vehicle break through the current limit of the national standard of 250A for public fast charging piles, and the maximum charging current can be doubled to 500A;Combined with the domestic mainstream 80-120kW public fast charging pile ecology, the charging power can be doubled through dual-gun overcharging technology.
It is reported that the passenger car dual-gun overcharging technology has A + B two charging circuits, the two circuits can run independently, can also work at the same time, A and B fast charging ports are symmetrically arranged on the left and right sides of the rear of the body. In single-gun charging mode, vehicles with dual-gun overcharging technology are no different from ordinary single-gun vehiclesIn the dual-gun overcharging mode, the dual-gun vehicle can intelligently call the output capacity of the second charging gun according to the vehicle's own needs, so that the charging current of the vehicle is doubled and the maximum charging capacity of the vehicle is reached.
The core advantage of dual-gun supercharging technology is that on the basis of not changing the original hardware of public fast charging piles, two charging guns can be charged at the same time, and the ordinary fast charging piles will be upgraded to "super fast charging piles" to double the charging power. The dual-gun supercharging technology not only makes full use of the huge resources of domestic public fast charging piles, conveniently improves the charging rate, greatly enriches the user's overcharging scenarios, improves the availability of supercharging, and brings users a comprehensive evolution of the supercharging experience. The first dual-gun overcharging technology applied on the DENZA N7 achieves a charging power of up to 150kW through boost charging in a single modeThe maximum charging power can reach 230kW in the dual-gun state, and the maximum energy replenishment is 350km in 15 minutes, and it is also suitable for the proportion of public fast charging piles in the country to exceed 95%, greatly expanding the use scenarios of supercharging and easily obtaining an efficient charging experience.
In response to the dilemma of "warm" color change of power batteries, BYD adopts the "internal heating method" to reuse the high-voltage topology of the whole vehicle, generate high-frequency pulse current between the drive battery and the electric drive, and generate heat from the internal resistance to heat the battery. After 5 years of research and development, BYD has realized the integration control of the topology layer, the cell layer, the drive layer and the control layer by virtue of the profound technical background accumulated in the years of deep cultivation of electric vehicles, which has the advantages of faster heating rate, more uniform heating and higher heating efficiency.
Southern + reporter Shao Yumei.
Author] Shao Yumei.
*] Southern Press Media Group Nanfang + client.