The Integration of Chassis Pressing in New - Energy Vehicles: A Leap Forward in Automotive Manufacturing​

In the dynamic realm of new - energy vehicle (NEV) manufacturing, a revolutionary trend is taking center stage - the integration of chassis pressing. This innovative approach is not only transforming the production process but also redefining the performance, safety, and design possibilities of NEVs.​

The Traditional Chassis Manufacturing Paradigm​

Historically, chassis manufacturing in the automotive industry has been a complex and labor - intensive process. For new - energy vehicles, which often have unique requirements due to their electric drivetrains and battery systems, the situation was no different. Traditional methods involved fabricating multiple individual components through various processes such as stamping, forging, and machining. These components were then painstakingly assembled together using welding, riveting, or bolting techniques.​

For example, in the past, the chassis of an electric car might consist of dozens of separate parts, each with its own manufacturing steps. The frame, suspension components, and battery mounts were all produced separately and then joined. This traditional approach had several drawbacks. Firstly, it was time - consuming, with each manufacturing and assembly step adding to the overall production cycle. Secondly, the large number of joints and connections in the assembled chassis could potentially be weak points, affecting the structural integrity and safety of the vehicle. Additionally, the complexity of the process led to higher production costs, as more labor, equipment, and quality - control measures were required.​

The Advent of Integrated Chassis Pressing​

Integrated chassis pressing represents a radical departure from the traditional model. This technology allows for the creation of large - scale, one - piece or highly - integrated chassis components in a single manufacturing operation. The process typically involves using high - pressure hydraulic presses, often referred to as giga presses, to mold molten metal, usually aluminum alloys, into the desired chassis shape.​

One of the pioneers in this field is Tesla. In 2019, Tesla introduced the concept of 一体化压铸 (integrated die - casting) and applied it to the production of the Model Y's 后地板 (rear floor). Since then, the technology has been continuously refined and expanded. Other automakers, both new entrants in the NEV space and established traditional manufacturers, have been quick to follow suit. For instance, L.K. Technology and Nezha Motors joined forces to develop a 20,000 - ton giga press in 2023. This colossal press has the potential to achieve integrated molding of the chassis for B - segment cars, opening up new possibilities for larger and more complex automotive structural components.​

Advantages of Integrated Chassis Pressing in NEVs​

Cost - Efficiency​

The most immediate advantage of integrated chassis pressing is cost - savings. By reducing the number of individual parts and eliminating multiple assembly steps, automakers can significantly cut down on production time and labor costs. Take Tesla's Model Y as an example. The traditional method of manufacturing the rear floor of a Model 3 required stamping over 70 parts and then spending 1 - 2 hours assembling them through welding, painting, and final assembly processes. In contrast, with integrated die - casting for the Model Y, this part is now a single piece, and the production time has been slashed to just 45 seconds. This not only reduces the time spent on production but also eliminates the need for subsequent complex assembly processes, resulting in a 40% cost reduction in the rear - floor assembly system alone.​

Weight Reduction​

Weight reduction is crucial for new - energy vehicles as it directly impacts the vehicle's range and energy efficiency. Integrated chassis pressing, often using lightweight aluminum alloys, can lead to substantial weight savings. For example, when NIO adopted an integrated die - casting process for the rear floor of the ET5, the weight of this component was reduced by 30%, which translated to a reduction of approximately 13 kilograms. Considering that for every 10 - kilogram reduction in vehicle weight, the driving range of an electric vehicle can be increased by about 2.5 kilometers, such weight savings are highly beneficial for NEV performance.​

Structural Integrity and Safety​

Integrated chassis pressing can enhance the structural integrity of new - energy vehicles. Since there are fewer joints and connections in a one - piece or highly - integrated chassis component, the risk of weak points due to imperfect assembly is minimized. Additionally, the use of advanced alloys and the precision of the pressing process can result in a chassis with higher strength and better impact resistance. For example, the "磐石底盘 (Bedrock Chassis)" developed by CATL, based on cell - to - chassis technology, can absorb 85% of the vehicle's collision energy, compared to around 60% absorbed by conventional chassis. The chassis is designed to withstand a 120 - kph impact without catching fire or exploding, highlighting the safety improvements enabled by such advanced manufacturing techniques.​

Design Flexibility​

This technology also offers greater design flexibility. With traditional manufacturing methods, the design of the chassis was often constrained by the need to assemble multiple parts. Integrated chassis pressing allows designers to create more complex and aerodynamic shapes that can optimize the vehicle's performance, both in terms of energy efficiency and handling. For example, the skateboard - style chassis, made possible by integrated manufacturing techniques, can integrate the battery, electric drive, and control systems in a more compact and efficient manner. This not only provides a flat floor for the vehicle, which can be used to create more interior space or better accommodate the battery pack but also allows for easier adaptation to different vehicle body styles, from sedans to SUVs.​

Challenges and Considerations​

Despite its numerous advantages, integrated chassis pressing is not without challenges. One of the main concerns is the high upfront investment required. The purchase and installation of large - scale giga presses, along with the development of specialized molds, can be extremely costly. This high investment may be a barrier for smaller automakers or those with limited resources.​

Another challenge is the issue of repair and maintenance. In the event of damage to an integrated chassis component, repairs can be more difficult and expensive compared to traditional chassis designs. Since the component is a single, large - scale piece, replacing a damaged part may involve replacing the entire integrated component rather than just a small, individual part. However, some manufacturers are already working on solutions to this problem. For example, Xiaomi's 72 - in - 1 die - cast rear floor features a three - stage anti - collision design. The rear - most part is a low - strength, low - speed crumple zone, connected to the integrated die - cast rear floor by a medium - and high - speed crumple zone. This design aims to keep the repair costs for low - speed collisions at the same level as traditional designs.​

The Future Outlook​

The future of integrated chassis pressing in new - energy vehicles looks promising. As technology continues to advance, the cost of manufacturing equipment may decrease, making this technology more accessible to a wider range of automakers. Moreover, ongoing research and development efforts are likely to lead to further improvements in material science, allowing for the use of even stronger and lighter materials in the pressing process.​

The trend towards greater electrification and the increasing demand for high - performance, efficient new - energy vehicles will also drive the adoption of integrated chassis pressing. With major players in the industry already investing heavily in this technology, it is expected that more and more new - energy vehicle models will feature integrated chassis components in the coming years. This will not only transform the manufacturing process but also lead to the development of safer, more efficient, and more innovative new - energy vehicles, further accelerating the transition to a sustainable transportation future.​

In conclusion, the integration of chassis pressing in new - energy vehicles is a game - changing development that has the potential to reshape the automotive industry. By offering significant advantages in terms of cost, performance, safety, and design, it is set to become a standard manufacturing method for the next generation of electric vehicles.