China regards the development of new energy vehicles (NEVs) as an important breakthrough to achieve the periodic goals of carbon peaking and carbon neutrality. After decades of development, China’s NEVs industry has made significant progress, especially in the past 20 years, where the industry has transformed from a follower to a leader. This article reviews the development background of NEVs in China and reflects the development status of NEVs in different periods of China. The development of NEVs in China was analyzed through data, reflecting the current development status and trends. Combined with the policy background of carbon peaking and carbon neutrality, the position of NEV industry in China’s automobile submarket, domestic market, and international market is analyzed. Based on the analysis and discussion, the main issues faced by the development of NEVs in China were proposed, including the impact of subsidy policy withdrawal on car companies and consumers, the construction and development of infrastructure, the research and development of core technologies and components, and the construction of a clean energy system based on sustainable development. It is proposed that the future development direction of China’s NEV industry can follow the directions of electrification, intelligence, lightweight, and sustainable development.
Aiming at the enhancement of the lightweight formability potential of aluminum alloy, the bulging and tensile properties of a 5052 Aluminum alloy sheet were tested on a microcomputer controlled sheet metal forming tester and tensile testing machine. The effects of different blank holder force, punch velocity and lubrication conditions were investigated on bulging properties by the experimental analysis. The cupping values (Erichsen Cupping Index: IE) of sheets with a thickness of 1.2 mm at room temperature were obtained under different process parameters. Meanwhile, the anisotropic property of the material was analyzed in different rolling directions. The results show that the sheet cupping values increase with the increase of blank holder force and punch velocity, and the stress state was changed due to the changing of the blank holder force and strain rate. Moreover, the use of lubricating conditions with a lower coefficient of friction allows the sheet to exhibit a larger cupping value. The effect of rolling direction on the anisotropy of 5052 aluminum alloy sheet is distinct, which means in the aluminum alloy sheet forming process the anisotropy factor should be carefully considered.
With the growing demand for insulation parts in extreme service environments, such as nuclear power, aviation, and other related fields, fiberglass-reinforced silicone resin (FRSR) has become a popular choice due to its exceptional physical and chemical properties in high-temperature and electromagnetic working environments. To enhance the performance of FRSR molded parts that can adapt to more demanding extreme environments, the oven postcuring process parameters on thermal stability and mechanical properties of the bobbin were investigated. The curing behavior of FRSR was analyzed by using thermogravimetric analysis (TGA) and the differential scanning calorimetry (DSC) method, and the bobbins were manufactured based on the testing results. Subsequently, the bobbins were oven postcured at different conditions, and the heat resistance and mechanical properties were analyzed by TGA and tensile tests. The results revealed that the tensile strength of the bobbin increased by 122%, and the weight loss decreased by 0.79% at 350 °C after baking at 175 °C for 24 h. The optimal process parameters for producing bobbins to meet the criteria of nuclear installations were determined to be a molding temperature of 120 °C, molding pressure of 50 MPa, pressure holding time of 3 min, oven postcuring temperature of 175 °C, and postcuring time of 24 h. The molded products have passed the thermal aging performance test of nuclear power units.
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