Are they pursuing better cruising range, is it the optimal value?

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Recently, Beiqi New Energy launched the EU400 with a driving range of 460km. It became the electric car with a driving range of more than 400km after the BYD e6 400 launched last year and the Tengshi 400 listed in February this year. According to the latest news, the Chery Arrizo 5e, which will be launched in September, will also have a driving range of more than 400km. Let's take a look at the related content with the car electronics editor.

Are they pursuing better cruising range, is it the optimal value?

The driving range of more than 400km is undoubtedly a great boon for the electric vehicle market, which will greatly alleviate the "difficult problem" of electric vehicle mileage anxiety. But at the same time, the new problem is also highlighted: Is there an optimal value for the driving range of the electric car? What is the limit of the driving range?

Increasing demand for driving range

"The driving mileage is of course as long as possible. I am driving an electric car. I usually only dare to drive in the urban area. If the driving distance is longer, I can safely drive to the suburbs to play." Interview with the reporter In the process, a consumer said his voice. Similar to this consumer's opinion, some friends who opened a pure electric car around the reporter also expressed dissatisfaction with the short driving range of electric vehicles. According to the survey data released by the National Information Center, 80.2% of consumers hope that the driving range of pure electric vehicles can reach more than 400km, and 24.2% of consumers will give up buying pure electric vehicles because their driving range is too short.

Not only consumers, but some experts in the automotive industry also pointed out that the current short driving range is one of the bottlenecks restricting the development of new energy vehicles. Cai Hai, deputy general manager of Beijing Beichen Asian Games Village Auto Trading Market Center, said that based on the continuity of policy guidance, the current consumer awareness of new energy vehicles is getting higher and higher, and the market is showing a good trend, but there are still some problems. One must face it, one of which is how manufacturers can upgrade the mileage of new energy vehicles.

In order to meet the market demand for increased driving mileage, more and more electric vehicle companies have begun to focus on the improvement of driving mileage. Recently, the EU400 launched by Beiqi New Energy has pulled the electric car to the price of the people with a driving distance of more than 400km and a price of less than 160,000 yuan after subsidies, but this does not seem to fully meet the needs of consumers.

There is no limit to electricity, and there is limit to space and energy density.

“Although the calibrated driving range is more than 400km, the actual driving is less than 400km.” A media person who measured the EU400 told the reporter that in fact, the EU400 announced the driving range under the NEDC condition is only 360km. "This kind of driving mileage, an ordinary outing is enough, two days do not even have to worry about the problem of not charging the pile." The media added, but if you want to travel across provinces and cities, you have to consider the charging problem. In order to reach the level of full-charge follow-up driving mileage and the same driving range of the same class of fuel vehicles, China's pure electric vehicles still have a long way to go.

Can the electric vehicle's driving range be increased indefinitely, can it reach a level similar to that of a fuel vehicle? "Now almost all new energy products are fighting for mileage, but in fact, when only measuring the battery power, There is no limit or optimal value for the driving range. It depends more on the space that the vehicle can provide for the battery and the energy density of the battery.” Xu Liang (a pseudonym), an engineer engaged in battery system research at a new energy vehicle company Tell the reporter.

"Although ternary lithium batteries are used at home and abroad, in terms of technology, there is still much room for improvement in the domestic battery technology level." Xu Liang said. At present, most of the domestic battery cells are cuboids, and the battery stability is relatively poor. In the battery string and parallel connection, it is necessary to install a copper plate, and also to install a cooling and heating system, etc., which occupy a certain space, and thus limit the The capacity of the battery pack.

According to the reporter, at present, foreign new energy vehicle manufacturers use cylindrical ternary lithium batteries, such as 18650 ternary lithium batteries. These batteries are more stable and have high energy density. Under the same space conditions, the battery pack releases more battery power than domestically produced batteries, so the driving range is relatively high. "But even so, due to the limitation of battery materials, the energy density of any battery has its limit. Under the fixed volume space, if the battery material is not changed, the driving range of the electric vehicle will not increase without limit." Xu Liang said .

Diversified development may become a future trend

What is the driving range of pure electric vehicles? For this problem, the benevolent sees benevolence, the wise sees wisdom, even the ordinary consumers around the reporter have different views on this. Some people think that 200-300km is enough in the state that the charging pile can be charged every day; but some people think that it is better to achieve the driving range of 500-600km, reach the level of the fuel vehicle, do not need to charge every day, travel at a long distance. Don't worry about charging.

"Because of space and material constraints, the driving range of pure electric vehicles in the future will not be much improved. Under the comprehensive working conditions, 300 to 400km will become the norm, otherwise the price/performance ratio of electric vehicles will be reduced." Xu Liang told Reporter, the increase in driving range will inevitably mean the increase of battery cells and the increase of weight, which not only increases the price of the vehicle, but also increases the weight of the vehicle and reduces the economy of the vehicle.

As far as the driving range of electric vehicles is concerned, as early as 2015, some experts put forward similar views with Xu Liang. Ouyang Minggao, executive vice president of China Electric Vehicles 100, said that he does not support the development of pure electric passenger cars with a driving range of more than 500km. The reason is not that the technology cannot be met, but the price is not high. At the recent lithium industry international summit forum, Ouyang Minggao proposed that with the increase of battery capacity and electric vehicle driving range, the safety challenge of electric vehicles will also be multiplied in all directions, giving complete vehicle electrical safety and battery safety. Charging safety and grid security pose major technical challenges.

"For some time in the future, electric vehicle manufacturers will focus their research and development on car safety and smart interconnection." Xu Liang said that especially smart interconnection will become the focus of more and more consumers. In addition, in addition to the improvement of electric vehicle technology, non-lithium battery new energy vehicles will also be developed to varying degrees, such as hydrogen fuel cell vehicles, graphene battery vehicles. According to the reporter's understanding, some auto brands have begun to develop hybrid electric power technology. Industry insiders said that the diversification of new energy vehicle technology and hybrid power technology in the future will become the main technical route for major auto companies to meet the standards under the double-point new deal.

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