New energy vehicle battery advantages and breakthroughs

New energy vehicle battery breakthrough

"In the past year, the electric vehicle industry is transforming to high-quality development, and the situation is encouraging." Chen qingtai, chairman of the all-china electric vehicle association, speaks to 21st century business herald on the eve of the meeting of the all-china electric vehicle association in diaoyutai on jan 7.

The main manifestations of high-quality development transformation are: positive development has almost completely replaced reverse development, innovation capability has been continuously improved, and the overall technical level has been improved to a great extent; The acceptance of electric vehicles among users and the market is rapidly increasing. The main products from the low-end to high-end, some have proposed to target high-end cars, luxury brands.

At the same time, when the world's major automobile enterprises are scrambling to announce the transformation to electric vehicles, China's electric vehicle industry system is gradually improving, the main parts, especially the power battery, always maintain the international first-class level, the level of main parts, supporting capacity is rapidly improving.

The cost performance will exceed the fuel car

In 2017, 60 new energy vehicles were sold in China from January to November. 90,000 vehicles, up 51 percent year-on-year. 4%, just one step away from reaching the annual target of 700,000 vehicles. Some experts predict that December sales figures are yet to be released, but the total number of new energy vehicles sold in 2017 May exceed 800,000.

"The development of electric vehicles will cross a critical point, that is, the cost performance of electric vehicles can reach and exceed that of fuel vehicles. If we cross this threshold, electric vehicles can rely on market forces to develop independently, and now we have to rely on policies and government subsidies." Chen qingtai told reporters that when the financial subsidies are completely eliminated, double points policy as an alternative policy, the new energy vehicle points ratio will continue to increase in 2020 on the basis of 12%.

When does this criticality occur? Chen's judgment is around 2025.

To this end, Chen qingtai suggested that car companies should make preparations in the following aspects: first, after the decline of financial subsidies, do a good job in the guarantee of sustainable development; in addition, electric cars themselves should improve the cost performance through lightweight and energy-saving; Secondly, the product technology to two-linespecial, one front is to improve the driving function of the car, the other front is to apply the intelligent network and sharing to the new energy vehicles; Third, autonomous driving is a commanding high point for the future. Fourth, in the limited time to do brand building.

At the same time, with the in-depth integration of the automobile industry with new technologies such as electrification, intelligence and informatization, a large number of new power car manufacturing companies have emerged in China. From following to influencing the whole world, China's automobile industry is walking out of a road from a big country of automobiles to a powerful country of automobiles.

"To really take a global stand in electric vehicles, or to make our own, it's impossible to rely entirely on electric vehicles, and it's hard to do better than conventional cars." However, if we can make efforts in such aspects as network connection, intelligence and Shared travel, we will be able to overcome it, because this is our strength. "I really hope that Internet companies will enter the electric vehicle industry in a large scale and share the cake to change the gene of traditional cars. Chen qingtai said.

However, ouyang minggao, executive vice chairman of the all-china electric vehicle association, stressed that although the core technologies of electric vehicles are generally battery, motor and electric control, for oems, they are more about the integration of brand, technology and marketing services.

Compared with traditional cars, this is particularly obvious in electric cars, and the gap between Chinese car companies and foreign car companies is more in the comprehensive power consumption. "Nissan's new leaf can run more than 300 kilometers at 40 KWH in Europe, and even 400 kilometers in Japan. Ouyang minggao told reporters.

Power batteries are big breakthroughs in specific energy

Ouyang also said that in 2017, China's power battery technology has made substantial progress, the energy density of power battery system has reached 150 watt-hours/kg or more, and the specific energy of lithium ion power battery is expected to achieve the target of 300 watt-hours/kg by 2020.

On March 1, 2017, the ministry, the national development and reform commission, ministry of science and technology, ministry of finance issued by four ministries and commissions of the action plan for promoting auto power battery industry development (hereinafter referred to as the "action plan") in the development the main goal of the power battery, and by 2020, the new lithium ion power battery monomer ratio above 300 watts power/kg; System than energy aim for 260 w/kg, costs have fallen to below 1 yuan/watt hour, using the environment - 30 ℃ to 55 ℃, can have 3 c charging capacity. By 2025, breakthroughs will be made in the new system's power battery technology, with a specific energy of 500 watt-hours per kilogram per unit.

"At present, domestic and foreign technology research and development are basically at the same level, but the core of lithium-ion batteries is safety." Ouyang minggao said that in terms of special research on new energy vehicles, ningde new energy, tianjin lishen and hefei guoxuan have made great technological breakthroughs.

It is understood that the energy density of single battery in ningde times has reached 304 watt-hours/kg, the cycle life is basically about 1000 times, and all the safety tests have passed. In addition, the cycle life and energy density of lishen and guoxuan team are almost the same as the target requirements.

But the development of power battery technology in China is not balanced. Ouyang minggao told reporters, the current China's power battery research can be summarized into four specific aspects: one is 2020 300 watt-hour/kg monomer specific energy can be industrialized, but the security should be strengthened; Second, as two new systems to achieve long-term goals, lithium sulfur and lithium air batteries are making relatively slow progress at home and abroad, and no breakthrough progress has been seen in 2017. Third, the research and development and industrialization of solid state battery continue to heat up, but due to the solid/solid interface stability and lithium metal negative charge of two major problems, the real all solid state lithium metal negative battery is not mature, but the inorganic sulfide as a solid electrolyte lithium ion battery breakthrough; Fourth, China has made some breakthroughs in high-capacity lithium-rich anode materials in 2017. Innovative lithium-ion batteries based on high-capacity lithium-rich anode and high-capacity silicon-carbon anode are more feasible than lithium-sulfur and lithium-empty batteries.

According to this judgment, in 2020, China's power battery unit energy density will achieve 300 watt-hours/kg, specific power up to 1000 watt-hours/kg, cycle more than 1000 times, cost 0. Within 8 yuan/watt-hour; From 2020 to 2025, the energy density of a single power battery can be increased from 300 watt-hours/kg to 400 watt-hours/kg, and the cost per watt-hour can be increased from 0. Eight dollars goes down to zero. Within 6 yuan.

"In 2025, the reasonable range of a pure electric car with general cost performance is 300-400 km. But by 2030, the biggest technological breakthroughs will be in electrolytes, solid-state batteries will be industrialised and the specific energy of a single battery is expected to hit 500 watt-hours per kilogram. "In 2030, the range of conventional cost-effective models should reach more than 500km. "Ouyang minggao said.

The latest breakthrough in automotive battery technology

Shortly before a patent published in the American fisker automotive news caused the attention all over the world, it has developed a kind of solid-state batteries, can only use 1 minute charging time, will increase the range of electric vehicles to 804 km, and in 2020 through the material and manufacturing technology progress will be cost down to a third of the conventional lithium-ion batteries.

Solid state battery has also entered the vision of most people. In fact, it is the same as the current liquid lithium battery in principle. The biggest difference is that the electrolyte becomes solid.

The two most notable characteristics of solid-state batteries are the high energy density. Many laboratories have achieved 300-400wh/kg, which is 2 times higher than traditional lithium batteries. 5 to 3 times, the other is safer, greater degree of elimination of battery rupture or high temperature and other unexpected combustion hazards.

Of course, solid-state batteries also have disadvantages, such as low overall conductivity, high internal resistance and slow charging speed. As for how the American fisker can charge for 1 minute and achieve a range of 800 kilometers, that is its core secret.

In general, if the solid-state battery can be truly low-cost industrialization oriented to the market, it will completely solve the core problem of the current popularization of electric vehicles, and new energy vehicles will truly kill gasoline vehicles.

The page contains the contents of the machine translation.