Sino-Singapore Jingwei Client, January 20th (Song Yafen) In recent days, GAC Ian's "1000 kilometers of graphene-based super fast charging battery" can be said to have made a lot of limelight and controversy.
The share price of GAC Group AH shares rose sharply on the day the news was released (January 15).
However, afterwards, experts represented by Ouyang Minggao, academician of the Chinese Academy of Sciences and vice chairman of the China Electric Vehicles Association, questioned the long-lasting electric vehicles, which caused them to be involved in the whirlpool of public opinion and even criticized as "gimmicks."
Is the application of graphene in lithium-ion batteries a major technological breakthrough or a gimmick?
Is the higher the cruising range of electric vehicles, the better?
Why are car companies obsessed with extending the mileage?
Sino-Singapore Jingwei Client conducted an exclusive interview with Fu Yuwu, Honorary Chairman of China Society of Automotive Engineers.
Public information shows that graphene has excellent optical, electrical, and mechanical properties, and is therefore known as the "king of new materials."
In the field of new energy batteries, it may help solve the problems of insufficient battery capacity and long charging time for new energy vehicles.
The graphene-based super fast charging battery copy written by GAC Aeon shows that the battery has 6C fast charging capability, combined with high-power super charging equipment, it can be charged to 80% in 8 minutes at the fastest.
Combined with silicon anode material, the capacity density can be increased to about 280wh/kg of cell density, the cruising range can reach 1000km, and the life span is more than 1600 cycles.
However, because the copy does not clearly indicate how many batteries have a battery capacity of 80%, and how large a battery is for a mileage of 1,000km, it has also been questioned by some industry analysts as a "gimmick."
Fu Yuwu believes that such a statement cannot be simply said to be a gimmick.
"Although the cruising range of graphene-based batteries and the feasibility of industrialization remain to be seen, whether it can be industrialized on the real road, the future results are visible. I think this is a useful attempt. Many experts have also raised some objections. I think this is also normal. We always hope that different companies and different technical routes will make greater technological breakthroughs."
In fact, in addition to the Guangzhou Automobile Group, many car companies and new energy battery companies are committed to the research and development of long-life products.
NIO recently released a 150kWh solid-state battery pack product with a single energy density of 360Wh/kg. The application of this product will increase the range of electric vehicles to 1,000 kilometers.
CATL also recently announced that it is developing a BEV battery pack, which can achieve a battery life of more than 1,000 kilometers and fast charge in 10 minutes.
Why are car companies keen on long battery life?
Does the mileage have anything to do with battery life?
Fu Yuwu said: "This is related to competition. The electrification of automobiles is to replace or partially replace fuel vehicles, and there is a huge contradiction and contrast between the two. Fuel vehicles do not have mileage anxiety, there is no The problem of refueling is difficult. You can refuel wherever you go. On the contrary, no matter how much the cruising range of electric vehicles increases, even if it reaches 1,000 kilometers, there are still charging problems and convenience problems."
Fu Yuwu emphasized, “What I want to express in particular is that 1,000 kilometers of cruising range is not our goal. The vast majority of new energy vehicle companies are not pursuing higher and higher cruising ranges. Under the current circumstances, electric vehicles The specific energy of the battery, whether it is a ternary power battery or a lithium battery, is limited. That is to say, more cruising range, if there is no breakthrough technology, it still needs to increase the weight of the battery to solve the problem. Long mileage. The body carries so many batteries, whether it is a passenger car or a commercial vehicle, it will definitely cause some problems."
According to Fu Yuwu, it was generally believed that a range of 200 kilometers would be sufficient for daily travel.
The Chinese Society of Automotive Engineers has done a lot of statistics, and the actual daily mileage for commuting to and from get off work in the city is actually 50 or 60 kilometers, even within 30 kilometers.
To alleviate the mileage anxiety of car companies and consumers, Fu Yuwu believes that first, we must improve the battery level and look forward to greater breakthroughs in the future.
Second, the public supporting facilities are more complete, which can meet consumers' requirements for the convenience of using electric vehicles.
Thirdly, the cost will drop.
The price of batteries has now doubled compared with 10 years ago, and the number of charging piles has also increased geometrically. It is more convenient for consumers to use, but there is still a gap compared with fuel vehicles.
Every winter, it should be the most anxious time for electric car owners, because the battery shrinks seriously.
So, is there a technically good solution to the reduction in the cruising range of electric vehicles in winter?
"This is a big challenge. It is a natural defect of the battery." Fu Yuwu explained, because its power and functionality will decay under low temperature conditions.
Especially when the air conditioner is used, whether it is used in summer or in winter, it will cause a large loss of battery energy.
Fu Yuwu believes that this is a big proposition for automotive technology, especially for expert scientists engaged in electrochemistry.
"As far as I know, some scientific and technological teams led by academicians are solving this problem, enabling electric vehicles to start at a low temperature of minus 40 to 50 degrees, and a system of thermal management has also made certain breakthroughs, so that batteries can Meet the needs of consumers under low temperature conditions." (Zhongxin Jingwei APP)
Fu Yuwu
Fu Yuwu, Honorary Chairman of China Society of Automotive Engineers, Honorary Chairman of China Automotive Talent Research Association.
He served as chief engineer of China FAW Harbin Automobile Transmission Plant, general manager and party secretary of Harbin Automobile Industry Corporation, and chairman of China Society of Automotive Engineers.
During his tenure at the Chinese Society of Automotive Engineers, he led the establishment of industry alliances such as the "Automobile Lightweight Technology Innovation Alliance" and "Electric Vehicle Technology Innovation Alliance", and presided over the formulation of multiple automotive technical specifications.
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