Develop electric vehicles with the power of batteries

At present, mainstream domestic passenger cars all use ternary lithium batteries, and the specific energy of the battery cell is about 200Wh/kg. According to this specific energy calculation, if you want to support a compact car to travel more than 500 kilometers, the battery weight needs to be about 800 kg. At the same time, the increase in battery weight brings another problem, that is, the increase in charging time and the difficulty of battery thermal control. Based on the current level of battery technology, the academic community generally believes that small and micro cars use battery drive, and mid-to-high-end passenger cars use hybrid technology.

Yang Yusheng said that new energy vehicles should be developed with the power of batteries. Lithium batteries are expensive now. If you install more batteries in order to pursue driving range, it will not only consume electricity itself, but also increase costs. If consumers do not buy it, the new energy vehicle industry will also be adversely affected. Yang Yusheng also suggested that in the period when the battery specific energy cannot be effectively broken through, battery fast charging cannot be achieved, and infrastructure cannot be popularized, various car companies may choose extended-range technology as an alternative. At the same time, he emphasized that my country should be committed to conducting original research, comprehensively improving the research and development capabilities of power batteries, and providing core technologies with independent intellectual property rights for pure electric vehicle power batteries in 5 to 10 years.

Chen Quanshi told reporters that extended-range technology is more suitable for domestic car companies and is a feasible technical route. At the same time, he said that the companies that are currently developing extended-range technology in my country need to strengthen the research and development of range extenders, that is, small engines. The range extender should be small in size, light in weight and high in power. At present, there are still few engines in China that meet this requirement. Because the range extender operates under special working conditions, there is no need to use a Carnot cycle engine. Like Toyota, it should develop an Atkinson engine to further improve efficiency.