The thermal conductivity adhesive, a key component of thermal management of power battery, was taken as the research object, and the simulation model of power battery was established by using simulation software Fluent. The coating area (85%~95%) of the thermal conductivity adhesive was simulated and calculated, and the influence of the use of thermal conductivity adhesive on the temperature field distribution and temperature consistency of power battery under typical working conditions was studied by bench test. It provides the basis for the selection and dosage of thermal conductivity adhesive in the design stage of thermal management scheme. The results show that as the coating area of the thermal conductivity adhesive decreases from 95% to 85%, the maximum temperature of the battery increases from 47.87 ℃ to 50.84 ℃, and the maximum temperature difference of the upper surface increases from 2.40 ℃ to 5.87 ℃. Considering the design criterion of power battery, it is determined that the use of 90% of the coating area of thermal conductivity adhesive can meet the design requirements of the highest temperature and temperature difference under three harsh working conditions of the power battery, avoiding the waste of raw materials caused by excessive heat conductivity adhesive in actual production, and achieving cost savings.

In order to solve the existing problems of too many processes in the In-Mold Graining Lamination (IMGL) process, the IMGL process based on Thermoplastic Olefin (TPO) skin was optimized and applied in practice. Compared with the existing problem of too long processes, this paper proposed the reduction of some processes and optimization of the forming equipment and mold, which were put in production. Compared with the existing IMGL process flow chart, the new flow reduced 6 processes, saved 35 m² production site, shortened the IMGL forming cycle by 15 s, reduced glue usage, and improved the utilization rate of glue by 90%.

In the existing automobile manufacturing process, multi-model and multi-platform co-line production has gradually become a trend. In order to improve the flexibility of the assembly line of automobile chassis system, combined with the characteristics of product structure and the actual situation of production site, the characteristics and requirements of the co-line production of automobile multi-link and torsion beam rear suspension structure were expounded from the aspects of assembly process, equipment form and quality assurance, for the co-line production of the two rear suspension structures were summarized, so as to better adapt to the flexible production needs of automobiles.

The life cycle assessment method was briefly introduced and applied to automotive painting process, the important environmental footprints including carbon footprint during painting production process were tracked, the impact of the use of materials, resources and energy as well as generated emissions on the ecological environment during the whole life cycle production activities of automotive painting process were quantitatively evaluated. The results show that energy consumption and generated emissions, utility power, topcoat and pretreatment electrophoresis processes, and grid power supply have more significant impacts on climate change and fossil resource depletion; material consumption and generated emissions, topcoat, sealant and pretreatment electrophoresis processes, and photovoltaic power supply have more significant impact on ecological toxicity and human toxicity.

In view of the characteristics of randomness, diversity and complexity of discrete manufacturing systems, efficiently and accurately identifying system quality risk factors and conducting quantitative assessment of quality risks are crucial to developing corresponding quality control activities and improving product quality. In this research, firstly a product quality risk assessment model for Fuzzy Colored Petri Nets was constructed. Then the fuzzy inference rules were determined, and the confidence of the intermediate library and the terminating library was calculated by fuzzy reasoning through the confidence empirical value obtained at the scene. Finally, the automotive top cover stamping process was analyzed as an example to verify the rationality of the model proposed in this paper, which can be applied to other similar discrete process manufacturing.

Due to the variety of automotive interior materials, complex composition, and up to hundreds of kinds of odor substances inside each car, odor pollution easily occurs inside the car. In order to improve interior air quality, this study referred to the existing domestic and foreign research on the application of colorimetric technology, proposed an interior odor detection method based on colorimetric sensor array technology, and made colorimetric analysis on the interior materials widely used in the vehicle, accurately identified the odor intensity, odor type and odor pleasure of interior materials samples. In this study, colorimetric sensor array was applied for the first time in the objective characterization of vehicle odor, which can provide data support for odor control in the automobile industry.

To address the issue of full lifecycle management of power battery, this article analyzed the different application scenarios and key functional requirements in the full life cycle management process of power batteries, designed an intelligent battery management system based on the Internet of Things for full life cycle management, and analyzed the operating mechanism of the model. The architecture and functions of the intelligent battery management system were designed, including the system architecture of the terminal battery management system, the selection of key sensors and the functions of cloud based battery management systems. Finally, the characteristics of intelligent battery management systems including compatibility, extendibility and intelligence, as well as the problems they face in application including data security, development and building of cloud based server, were summarized.

In order to address the issue of corrosion in the manufacturing and storage process of die cast aluminum alloy parts without coating on the surface, this article analyzed the corrosion mechanism and cause of die cast aluminum alloy parts, and elaborated on an anti-rust scheme suitable for die cast aluminum alloy, test and application research on anti-rust materials and processes were also carried out. Corresponding rust prevention measures were adopted for each link in the plan, including the use of water-based rust prevention materials and vapor phase rust prevention materials. After laboratory and vehicle verification, this anti-rust technology can effectively prevent corrosion in the manufacturing, storage, transportation, assembly and other processes of die cast aluminum alloy parts, and systematically solve the corrosion problem of die cast aluminum alloy parts.

With the stress value, the maximum contact pressure and the compression force as evaluation basis, the influence of the straight line length of the return pipe joint and the return pipe on the assembly of the structure was studied by using the finite element simulation analysis method. With the increase of the length of the straight line, the stress value of the joint and the return pipe decreases gradually, and the maximum stress value of the joint and the return pipe is 650% and 295.2% larger than the minimum stress value, respectively. The maximum contact pressure of the inner liner and the outer liner also decreases gradually, and the maximum contact pressure of the inner liner and the outer liner is 384.9% and 290.2% greater than the minimum value. The pressing force gradually decreases, and the maximum value is 678.8% greater than the minimum value. The research results show that change of the length of the straight line has a significant impact on the assembly performance of the structure.

This paper introduced the process and performance of reaction injection molding polyurethane car trunk cover plate, and compared it with traditional car trunk cover plate. The results show that reaction injection molding polyurethane car trunk cover plate is easy to clean and daily maintain, it reduces the risk of sliding of items in the luggage compartment when the car is turning, improves the driving experience. At the same time, acetaldehyde is significantly reduced, and other properties also meet the requirements for trunk cover plate.