According to the nameplate information on the pile, Huawei's model is DT600L 1-CNA 1, with an output voltage range of 200- 1000V, a maximum output current of 600A and a maximum output power of 600KW. Industry experts and major media have commented that Huawei has laid out kilovolt high-voltage ultra-fast charging, and its technical level has been far ahead.
As we all know, the power of overcharging piles on the market is generally around 300KW, and Huawei's overcharging pile power has doubled at once. What does this mean? What do these numbers on the nameplate stand for? Why does Huawei's over-filled pile represent the high-tech level of zui in the industry? What harsh conditions do you need to make such a high-power super-filled pile?
Let's talk about it briefly from the consumer's point of view today, so that even a small white who has never studied physics can fully understand it.
Charging for 5 minutes and battery life of 300KM? !
How fast is the 600kW maximum power charge?
In an ideal state, if the charging time (h)= battery capacity (kWh)/ charging power (kW) is calculated, it means that a new energy vehicle with a battery capacity of 50kWh can charge 600kWh of electricity in one hour, and the power of 600 kW can replenish energy in only 5 minutes. Generally speaking, 14- 18 kWh can last 100KM, which means that it can last 300+KM after 5 minutes of charging.
Of course, the premise is that your electric car is equipped with a kilovolt high-voltage platform.
What is high-power overcharge?
New energy vehicles have core pain points such as battery life and charging anxiety.
In order to extend the cruising range, major manufacturers have expanded the battery capacity, and the battery life anxiety has gradually decreased, but the charging anxiety has begun to surface.
As a result, high-power overcharge came into being.
According to "power = voltage x current" (that is, P=UI), when either voltage P or current I increases, power P will increase, charging speed will be faster, and the time for fully charging will be shorter. So there are two ways to realize high-power ultra-fast charging: high-current fast charging and high-voltage fast charging.
High-current fast charging, mainly by increasing current to improve power. However, under the formulation of national standard 20 15, the maximum output current of third-party charging piles is generally limited to 250A (but self-built super charging piles can successfully break through the current limit of 250A and achieve higher current output). At present, the fast charging piles built by most domestic charging enterprises have reached the upper limit of 250A current recommended by 20 15 national standard, but the maximum charging voltage is different.
When the current passes through the resistor, all the electric energy consumed by the resistor will be converted into heat energy. Generally speaking, when the charging pile charges the car, the charging pile will definitely heat up. According to Joule's law (Q=I? RT) It can be seen that the heat generated by the current passing through the conductor is proportional to the square of the current, to the resistance and to the electrifying time. Under normal circumstances, the maximum input current of the charging pile is 250A, but the current of Huawei super charging pile is 600A A. Under the premise of the same resistance and time, the conventional charging pile generates 62,500 joules of heat, while Huawei super charging pile generates 360,000 joules of heat. If Huawei's technology does not have two brushes, can it develop a charging pile that can withstand such high heat?
In addition to the limitation of the national standard, the high-current fast charging has also brought about a significant increase in thermal effect, which has doubled the threshold of high-current fast charging technology. Therefore, compared with high current fast charging, high voltage fast charging has more advantages and is the mainstream of the market.
High-voltage fast charging means increasing power by increasing voltage. The technical barrier of high-voltage fast charging is relatively high, because increasing the voltage will bring safety problems and increase the requirements for parts. The voltage supported by DC fast-filling piles built in the market is generally 200-750V V. Since 2022, 200- 1000V super-filling piles have been introduced one after another. At present, the application of 200- 1000V over-filled piles is still relatively small.
Liquid cooling technology: the mainstream direction of overcharge in the future
Huawei adopted the most advanced liquid cooling technology in the design of single pile and single gun for over-filled piles.
As mentioned above, the rapid charging with high current brings a significant increase in thermal effect, and the continuous high temperature is very easy to damage the electronic components of the charging device, and even cause a safety accident of burns. In order to avoid safety accidents, it is necessary to reduce the calorific value of the charging gun cable, mainly through air cooling and liquid cooling. The traditional air-cooled fast charging pile uses thick cables to dissipate heat, but this makes the traditional fast charging pile extremely bulky and bulky. For the charging pile with liquid cooling technology, the electronic pump drives the coolant to flow, so that the coolant circulates among the liquid cooling cable, the oil tank for storing the coolant and the radiator, thus achieving the heat dissipation effect. Therefore, the wires and cables of the liquid-cooled charging pile are thin but safe, which is also the reason why the charging cable of Huawei super charging pile is not thick, although it has ultra-high power of 600kW.
In addition, the traditional air-cooled charging pile will also produce huge noise in the working process. The air-cooled cooling module adopts high-speed fan to exhaust air strongly, and cooperates with the pile body cooling fan, so the noise is evenly superimposed >: 70dB. However, the charging module of the liquid-cooled charging pile has no cooling fan, so the noise of the charging module itself is zero, while the main engine uses a high-volume low-frequency fan, so the noise is low.
Generally speaking, the liquid-cooled overcharged charging pile has the characteristics of high charging efficiency, low calorific value, high safety and low noise. In a sense, liquid-cooled overcharge is as important to the new energy automobile industry as 5G network is to the Internet industry, and it must be the mainstream of development in the next few years.
Jingneng New Energy has launched 960kW liquid cooling overcharge in 2022.
At present, the popularity of liquid-cooled overcharge technology is low, because its technical threshold is very high and it needs to invest a lot of R&D talents and funds. There are few domestic enterprises that have mastered the liquid cooling overcharge technology. Therefore, in the impression of many people, it seems that only super giants such as Huawei and Tesla have such strong strength.
What many people don't know, however, is that Jingneng New Energy, as a new brand in the field of new infrastructure of Internet of Things and "Top Ten Influential Brands in China Charging Facilities Industry in 2022", launched a 480/960kW split DC liquid-cooled overcharge terminal independently developed and produced as early as 2022 with professional R&D talents, excellent R&D technology, abundant capital and strong industrial supply chain integration capability. The output voltage is 200- 1000V, the single gun current can reach 600A, and the single gun power can reach 600kW. Ideally, 100 degree power supply 10 minute can be realized.
The threshold for producing charging piles is not low. Charging module is the most critical component of charging pile, and its internal structure is complex. A single charging module contains more than 2500 electronic components, which is an important component that affects the overall performance and safety of charging piles. With the improvement of voltage level and charging level, the charging module is required to have stronger high voltage resistance and power, which further improves the technical threshold of charging module.
Compared with the traditional air-cooled charging module, the liquid-cooled charging module is fully enclosed, which effectively isolates dust, flammable and explosive gases and has higher protection. The cables used in liquid-cooled charging piles also need to be tested for high temperature resistance, corrosion resistance, explosion resistance, cold resistance and low temperature resistance, so the technical barriers and production costs of liquid-cooled overcharging are higher.
Due to the high production cost and high technical barriers, not all charging pile brands have their own R&D teams and workshops, and not all charging pile manufacturers with R&D teams and workshops can produce liquid-cooled overcharge.
Jingneng New Energy, a national high-tech enterprise, a small giant enterprise specializing in cutting-edge technology, the original manufacturer of charging piles, and a professional R&D team of more than 30 people. Jingneng New Energy has been deeply involved in the charging facilities industry 1 1 year, and independently developed and produced charging piles including 600/720kW high-power fast charging piles and 480/960kW high-power liquid-cooled super charging piles. It is the designated supplier of charging equipment products of heavy truck giant Sany Group, the supplier of State Grid in 2023, and the strategic partner of Fortune 500 companies such as Shipeng Automobile, Guangzhou Automobile Group and Xugong Machinery. It is a new energy comprehensive industry overall solution provider integrating R&D, production, sales, construction and operation and maintenance of charging piles.
The appearance of Huawei's 600kW liquid-cooled overcharging pile will undoubtedly set off a research and development boom of high-power liquid-cooled overcharging technology in the charging infrastructure industry. It is believed that with the continuous progress of technology and the continuous expansion of the market, liquid-cooled super charging piles will be more widely used. Jingneng New Energy will, as always, deeply cultivate high-power fast charging technology and liquid-cooled overcharge technology to provide users with a faster, more comfortable and safer charging experience.
This article comes from Che Yi author Jingneng New Energy, and the copyright belongs to the author. Please contact the author for any form of reprint. The content only represents the author's point of view and has nothing to do with the car reform.