On July 29th, 20021year, Contemporary Ampere Technology Co., Ltd. released its first generation of sodium ion batteries, and the energy density of the batteries reached 160Wh/kg. Charging at room temperature 15 minutes, the power can reach more than 80%; At the low temperature of -20℃, the discharge retention rate is above 90%. The system integration efficiency can reach more than 80%. But the price of sodium ion battery is much lower than that of potassium ion battery. At present, the cost will be 30-40% lower than that of carp battery. In this study, the high torque density hub motor is designed and verified, the configuration of bending-torsion decoupled electric wheel is innovatively put forward, and the drive axle scheme of two parallel wheels driving electric wheel is developed. The structural design, optimization and safety scheme design of liquid hydrogen storage tank have been completed, and the mass density of on-board hydrogen storage has increased to more than 10%. The test results of the two models have exceeded the established goals and have great commercial value.
2. Solid-state battery technology published by Nature, a paper received 35 million yuan in financing.
The paper "Dynamic Stability Design Strategy of Lithium Metal Solid-State Battery" published in Nature has caused a sensation, which is a rare breakthrough in credible solid-state batteries in recent years. Compared with the traditional carp ion battery, the solid lithium metal battery has the advantages of large capacity, high energy density and high safety, and can hold more energy in the same volume, and the charging time only takes a small part. However, due to the formation and infiltration of lithium dendrites at high current density, the stability of solid lithium metal batteries has been very poor.
In order to overcome this challenge, under the guidance of Professor Xin Li of Harvard University, Dr. Ye Luhan and his team innovatively designed a solid lithium metal battery with hierarchical interface stability (response to lithium metal) to achieve ultra-high current density and prevent the penetration of lithium dendrites.
In this paper, a mechanism similar to the expansion screw effect is proposed, that is, any crack is produced by dynamic decomposition with good constraints, and constraints are produced by the "anchoring" effect produced by decomposition.
3. The new distributed driving liquid hydrogen fuel cell has made a breakthrough in the verification of heavy commercial vehicles, accelerating the application of hydrogen fuel cell commercial vehicles.
The research achievement of the new energy power system team of Tsinghua University Transportation Research Institute: the design, analysis and verification of a new distributed driving liquid hydrogen fuel cell heavy commercial vehicle was selected as the "Global New Energy Vehicle Frontier and Innovative Technology" in 2022.
Aiming at the electrification demand of urban heavy-duty and long-distance freight heavy-duty commercial vehicles, this paper puts forward the technical scheme of distributed driving liquid hydrogen fuel cell heavy-duty commercial vehicles, explores the design and development of cutting-edge technologies such as high-power fuel cell system, large-capacity liquid hydrogen system and high-power hub motor, and completes the design, integration, manufacture and test of 35t-class liquid hydrogen fuel cell truck and 49t-class liquid hydrogen fuel cell tractor. In this study, the high torque density hub motor is designed and verified, the configuration of bending-torsion decoupled electric wheel is innovatively put forward, and the drive axle scheme of two parallel wheels driving electric wheel is developed. The structural design, optimization and safety scheme design of liquid hydrogen storage tank have been completed, and the mass density of on-board hydrogen storage has increased to more than 10%. The test results of the two models have exceeded the established goals and have great commercial value.