Can 800V really solve battery life anxiety?Netizen There is no charging pile, and 800V is just a PPT

Mondo Cars Updated on 2024-01-19

The development of new energy vehicles has brought revolutionary changes to the automotive industry. Electric vehicles not only reduce carbon emissions and protect the environment, but also provide higher power performance and driving pleasure. However, new energy vehicles also face some challenges, the biggest of which is range and charging speed. Many consumers have concerns about the range of new energy vehicles, worrying that they will not be able to move forward due to insufficient power during long-distance driving.

At the same time, charging speed is also an important factor affecting consumers' choice of new energy vehicles. Compared with the energy replenishment efficiency of fuel vehicles in a few minutes to fill up with fuel, the charging time of new energy vehicles usually takes dozens of minutes or even several hours, which undoubtedly dissuades many consumers. Therefore, in order to solve this problem, more and more new energy vehicles have begun to support 800V high-voltage fast charging technology.

What is an 800V High Voltage Platform?

800V high-voltage fast charging technology refers to the system with a voltage range of 550-930V for the high-voltage electrical system of the whole vehicle, collectively referred to as the 800V system. According to the charging power p = i (current) v (voltage), in order to increase the charging power, it is necessary to start from both current and voltage. If you want to increase the charging power by increasing the current, then if the resistance is calculated according to the formula of calorific value = i (current) r (resistance), the calorific power will increase by 4 times for every 1 times increase in current. Therefore, high-current overcharging has high requirements for heat dissipation, and more effective heat dissipation methods and thermal management mechanisms are required.

Therefore, the advantage of the 800V system is that it can increase the charging power without increasing the current, thus shortening the charging time. The first model of the 800V high-voltage system is the Porsche Taycan, which can charge up to 80% in 15 minutes and has a range of up to 400 km. Domestic independent brands such as Li Auto, Xiaopeng Motors, and Zeekr have also launched 800V high-voltage fast charging models, and it seems that 800V fast charging has really become the mainstream way to solve range anxiety

It is undeniable that the emergence of 800V high-voltage fast charging technology has undoubtedly brought a qualitative leap to the charging experience of new energy vehicles. It makes the charging speed of new energy vehicles close to the refueling speed of fuel vehicles, so that consumers can enjoy the convenience of refueling. Moreover, the 800V high-voltage fast charging technology is also highly compatible, allowing it to charge faster than a 400V system, even on charging piles that do not support 800V.

This is because the 800V system can reduce the voltage from 800V to 400V or lower through a DC converter, so as to adapt to different charging stations. Most of the models with the 400V platform cannot increase the voltage, and they can only "sigh" in the face of the high power of the 800V supercharging pile. Of course, since 800V models can buck and be compatible with 400V electric piles, it is also one of the feasible solutions for 400V platform models to provide boost voltage to improve charging efficiency during charging.

Disadvantages of 800V high voltage

First of all, the cost of 800V systems is higher, requiring a higher level of technology and more expensive materials. For example, 800V high-voltage systems require the use of high-performance semiconductor materials such as silicon carbide or gallium nitride to improve resistance to high pressures and heat. The ** of these materials is much higher than that of traditional silicon materials, so they will increase the manufacturing cost of 800V systems.

Secondly, the popularization of 800V systems also requires more supporting facilities and services, and more 800V charging piles and charging networks. The charging power of the 800V system is relatively high, up to 480kW, which puts forward certain requirements for the distribution of the local power grid. In fact, the strong national grid is not unable to afford the demand for overcharging, but the peak charging period of charging stations often coincides with the daily load curve of residents.

To put it simply, the increasing demand for electricity during the peak period of residents, the grid capacity is a little unbearable, how can there be too much margin for the 800V supercharging pile with more charging power. For the power grid, three 120kw DC fast charging piles are obviously more efficient than a 360kw supercharging pile, after all, the power can be shunted to meet more groups waiting for charging at the same time, and overcharging is no different from ordinary charging piles after losing the support of high power. Therefore, some netizens said: There is no charging pile, and 800V is just a PPT

In order to maintain the speed advantage of supercharging during peak periods, it is necessary to build self-built high-cost energy storage stations to meet greater demand during peak periods by "shaving valleys and peaks". However, in this way, the operating cost of the supercharging pile will increase a lot and the wool is out of the sheep, so the electricity cost of the supercharge will generally come to 2 yuan, and the electricity will be more expensive during the peak period.

However, many times, the propaganda of car companies deviates from the meaning of the 800V platform, and it seems that the high-power supercharge can quickly fill the charge and solve the slow charging, which is the value of the existence of the 800V platform. Obviously, this understanding is incomplete. The greatest significance of the 800V platform for new energy trams is to further improve system efficiency and reduce energy consumption. Just like with the same motor and battery size, a 72V electric motorcycle will generally have stronger performance and longer range than a 36V electric bike.

In short, 800V high-voltage fast charging technology is an important innovation in the new energy vehicle industry, which can greatly improve the range and charging speed of new energy vehicles, allowing consumers to get rid of range anxiety and enjoy a better charging experience. However, there are still many problems and challenges in 800V high-voltage fast charging technology, and more technological breakthroughs and supporting construction are needed to truly achieve popularization and application. Chinese automobiles have made significant progress in the field of 800V, not only have several brands launched 800V high-voltage fast charging models, but also a number of companies are involved in the construction of 800V charging piles and charging networks. The leading position of Chinese automobiles in the field of 800V demonstrates the innovation ability and development potential of Chinese automobiles, and also opens up a new path for the future development of new energy vehicles.

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