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Moving EV Manufacturing Into the Fast Lane

By Shashi Rajagopalan Director Manufacturing Business Group - Americas, Siemens Digital Industries Software
By Greg Roth Director of Automotive and Transportation Solutions , Siemens Digital Industries Software

Major automotive OEMs and new startups alike are well entrenched in the pursuit of autonomous, connected, electrified, and shared mobility (ACES). Dozens of companies have established programs for designing and testing autonomous and connected vehicles, either for personal use or as part of a shared mobility system.

Progress is being made, but large-scale, real-world applications of these technologies are still years in the making. Electrified mobility, on the other hand, has the potential to create significant short-term disruption in the automotive industry and is already on the way to mainstream adoption.

The recent and rapid growth of electric vehicles (EVs) is driven by several factors:

  • Key EV technologies, such as batteries, are improving faster than expected.
  • Greater regulatory pressure at national, regional, and city levels is driving early adoption of what is perceived to be a new norm.
  • Intense investment into EV programs and startup companies from a variety of sources, both traditional automotive companies and new entrants to the market.
  • A growing network of EV charging stations is making it easier and more convenient to use an EV every day

Challenges of EV Manufacturing

EVs present new challenges that major automotive brands and startup companies have yet to face. These challenges fall into four areas: lightweighting, the transition to EV platforms, battery production, and supplier evolution.

Drive range and vehicle cost continue to be central concerns of consumers. Automotive manufacturers must maximize the drive range of their vehicles while continuing to reduce costs through more efficient production.

Vehicle weight is a major determiner of drive range; a 10% weight reduction can improve fuel economy up to 8% (Shea, 2012). Unfortunately, electric drivetrains and batteries are significantly heavier than ICE powertrains.

To counteract the increased weight of electric powertrains, vehicle manufacturers are incorporating advanced lightweight materials into the vehicle body. Replacing conventional materials with lightweight magnesium and aluminum alloys or carbon fiber can reduce the weight of a vehicle body and chassis by up to 50 percent.

Vehicle manufacturers must incorporate these materials intelligently and ensure that weight reductions do not compromise vehicle safety.

Drive range is also impacted by the size and chemistry of the vehicle batteries. Many EVs currently on the market are adapted from pre-existing ICE vehicles. Due to differences in the packaging of ICE and electric powertrains, these non-native EVs compromise battery size to fit into the existing architecture.

Manufacturers are shifting to modular native EV platforms, both to better accommodate electric powertrains and to support high-volume production. Native EV platforms can accommodate battery packs that are up to 25 percent larger, providing greater drive range, and support flexible powertrain configurations. Advances in battery chemistry will continue to improve the energy density of these batteries, further improving range.

The cost to manufacture and purchase EVs will decline as production increases, but reaching price parity with ICE vehicles will require additional advancements in battery production methods. Batteries are the main contributor to the cost of EVs.

The production of battery cells is the primary challenge, accounting for 70% of the total cost of the battery pack. Improving cell chemistry that increases energy density will help, but battery manufacturers will need additional means of reducing cell production and battery pack assembly costs to deliver cost-effective vehicle batteries.

Finally, automotive OEM and supplier relationships will become more important and more complex. For automotive OEMs, this transition will present new challenges in managing their supply chains including lead-time, quality assurance, and traceability of the product lifecycle across organizations.

Suppliers will see a great opportunity for growth and evolution into providers of more complete vehicle sub-systems. With growth, however, comes additional risk. OEMs will set aggressive time-to-market goals for increasingly complex systems. In addition, suppliers will need to ensure robust collaboration and traceability procedures are in place as they work with OEMs and other suppliers.

Major automotive manufacturers have already embarked on the transition to EV manufacturing, triggering the largest automotive transformation in decades. Automakers will need to adapt or replace the processes, technologies, and tools used throughout the enterprise to overcome the challenges of EV manufacturing.

Digital Twin

Creating a digital twin of the product and the production can solve the challenges of EV manufacturing by blurring the boundaries between design and manufacturing, merging the physical and digital worlds. Digital twins of the production process and production system are key to driving operational efficiency improvements through factory of the future concepts.

These digital twins capture physical asset performance data from products and factories in operation. The data from smart connected products in the field and factory equipment is aggregated, analyzed, and integrated into product design as actionable information, creating a completely closed-loop decision environment for continuous optimization.

This comprehensive digital twin is comprised of the many digital threads that weave together cross-domain engineering between mechanical, electrical, and software domains along the product and production lifecycle.

Data analytics, cloud, and IoT enable closed-loop performance engineering that spurs continuous improvement of design, manufacturing, and performance. Such a comprehensive digital twin enables manufacturers to plan and implement manufacturing processes for new lightweight designs and modular vehicle platforms while reducing the costs of battery production and coordinating across deep supplier ecosystems.

This approach will not be optional but required for automotive companies as they transition into the dynamic and fast-paced future of their industry. Let’s examine how the digital twin helps solve each challenge.

Lightweight Designs

The integration of new materials into vehicle architectures is key to many manufacturers’ strategies for reducing the weight of vehicles while maintaining vehicle safety.

These new materials, however, introduce new manufacturing constraints. For example, the increasing use of aluminum and carbon fiber to create vehicle bodies has caused an adoption of new joining technologies.

A digital twin of the production process enables engineers to evaluate multiple methods of joining vehicle components, including joining technology and tool orientation, to identify the most accurate and efficient process. For instance, laser welding requires high accuracy, especially when dealing with complex component geometry.

Using a digital simulation of the product components and robotic welding, a programmer can quickly define a welding seam on the product geometry that accounts for robot collision constraints and configuration to produce a single welding seam.

New materials are not the only change agent related to lightweight vehicle design and manufacturing. Advanced technologies like additive manufacturing (AM) can also contribute to the reduction of vehicle weight by enabling the production of more sophisticated component geometries.

AM allows engineers to reimagine product design to expand their capabilities, improve performance, and reduce material usage and weight. The intelligent use of AM can produce astounding results. AM has become a major piece of Ford’s manufacturing eco-system. One of their AM applications, according to Ford, has the potential to save the company more than $2 million.

EV Platforms

As manufacturers shift towards native EV platforms, their assembly processes will need to shift towards a more modular build environment. In addition, strategic alliances between global automakers will be important methods of gaining access to foreign markets, diluting the cost of platform development, and accelerating supply chain optimization through scale.

Assembly methodologies, processes, and tooling will evolve to support these modular build scenarios that can quickly adapt to market conditions. As a result, manufacturing planning must be digitalized to become more agile and integrated. Leveraging a digital twin of the product, engineers can evaluate manufacturing methods virtually, analyzing multiple tools, assembly sequences, and production line configurations while identifying and resolving issues

For example, vehicles contain hundreds of parts that need to be assembled. The planning team can define assembly processes that identify the tools and equipment needed to assemble each product, and the sequence in which this assembly should occur, digitally.

Advanced process planning solutions help planners allocate vehicle parts to new assembly processes and can identify parts that have yet to be processed. Each of these processes can then be allocated within the manufacturing facility to define and validate the assembly sequence.

Battery Production

Reducing the cost of battery production is a critical step to the success of EVs. Integrated digital solutions can help battery producers achieve cost-effective batteries by connecting battery design with manufacturing and establishing a digital thread throughout the flow.

Advanced battery design and simulation solutions enable engineers to optimize cell design and performance at early stages of development. Cell geometry can be defined and optimized in the context of the battery modules and final package.

Then, battery cells, modules, and packs can be evaluated in a virtual production process, enabling engineers to design flexible, efficient processes across all fields of cell, module, and pack assembly. This caters to the market demands for improvements in efficiency and cost along the entire value chain in battery manufacturing.

Supplier Evolution

Leveraging a comprehensive digital twin will enable OEMs and suppliers to collaborate effectively and efficiently under tight delivery timelines. Such a digital twin facilitates model-based definition and engineering that can help improve designs for manufacturing processes.

Assembly variation analysis and automated feature-based CMM programming ensures first-pass manufacturing quality and can identify the root causes of product defects. The digital twin can also be used to plan quality inspections and tie these to change management processes. With these capabilities, OEMs and suppliers can achieve faster quality ramp-up with root-cause analysis that feeds back into product design change processes.

Suppliers will also need to remain flexible to short lead times and accelerated evolution of assembly methods to meet variable demands. Digital twins of the production facilities will allow these companies to make the best use of existing capabilities while quickly identifying and designing new production lines or assembly processes.

If additional production lines or new assembly processes are necessary, manufacturing engineers can design these additions in the context of the current factory, verifying floor space, and layout.

Conclusion

EV manufacturing presents new and novel challenges to automotive OEMs and startups seeking to become major electric mobility players. These companies will need to adopt advanced manufacturing technologies, such as additive manufacturing, and develop modular production facilities to produce the lightweight and flexible platforms needed for next-generation EVs.

Cost reduction and coordination across the manufacturer and supplier ecosystem will also be critical to fostering the growth of EVs in the market.

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