NIO Automobile, dual motor application of silicon carbide controller

     The 18th Shanghai International Automobile Industry Exhibition (abbreviation: 2019 Shanghai Auto Show) will be unveiled at the National Convention and Exhibition Center (Shanghai) from April 18th to 25th.

      The domestic pure electric vehicle manufacturer Weilai Automobile participated in the Shanghai Auto Show for the second time. Different from the previous one, Wei Lai not only released the latest car product preview version of ET Preview, but also showed the NIO Power service system on site, and for the first time disclosed Weilai in the three electric (motor, battery, electricity) Prospective technology in the field of control - 220kW permanent magnet synchronous dual electric drive system and carbon fiber housing battery pack.

      On April 16th, Huang Chendong, vice president of Weixin Power Engineering, accepted an interview with the reporter (www.thepaper.cn). Huang Chendong said that in the research and development of the three power companies, the cost of the battery is the bottleneck of the entire industry, which actually restricts the development of the electric vehicle industry. How to reduce the cost of the battery and improve the safety of the battery is also a topic that the research and development department of Weilai is investing heavily.

     Huang Chendong said that the advanced nature of the 220kW permanent magnet synchronous dual-electric drive system is reflected in two aspects: First, the power density of the electric vehicle can be made higher and the size is smaller, thereby improving the overall efficiency layout of the electric vehicle. On the other hand, torque vector control can be achieved. In general, each wheel can be independently controlled, so that the flexibility of the car is very high and the turning radius is smaller. In addition, the dual motor also uses a silicon carbide controller that can increase battery life by 6%.

      Huang Chendong said that in the battery pack, the biggest role of the carbon fiber shell is to reduce the weight, which can reduce the weight of about 50 kg, so that the power density of the battery pack is increased. As the weight of the battery pack is reduced, the speed can be increased by about 7%. .

      When the 220kW permanent magnet synchronous dual electric drive system and carbon fiber housing battery pack can be commercialized, Huang Chendong pointed out that this technology belongs to technology reserve and forward-looking technology, and aims to serve the next generation products in the next two to three years. "The commercialization of new technologies requires not only the advancement of technology, but also the reality. Premature use of new technologies will increase costs, and we hope to improve system efficiency as a whole," he said.

     He said that Weilai has accumulated more than 200 patents in motors, batteries and electronic control. “For example, our motors start from scratch, from design to manufacturing. In terms of batteries, in addition to the battery from external procurement, other technologies come from Weilai's independent research and development, such as battery management system, which determines the battery. Safety, such as the structure of the battery pack, the cooling of the battery pack, the vibration of the battery pack, etc. Four independent control of the motor, torque distribution, power distribution, etc., these are the main source of patents.

      At this year's auto show, Wei Lai also demonstrated a high-performance intelligent electric power platform in the core technology of Sanpower. It combines the high-efficiency NCM811 nickel-cobalt-manganese battery pack technology with the high-energy density NCM811 nickel-cobalt-manganese battery pack technology to help the NE6 production range of the 510km NEDC cruising range.

      (Article source: Sohu)