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selectrify® – steel solutions for electric mobility

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thyssenkrupp Steel Europe AG

Kaiser-Wilhelm-Strasse 100

47166 Duisburg, Germany

+49 (0)203 52-0

With cost-efficient lightweighting solutions for the vehicle structure, robust and safe battery housings and electrical steel for efficient electric motors, thyssenkrupp Steel is demonstrating the enormous potential of innovative steel solutions for electric vehicles. The way we build cars is changing. The electric car 2.0 doesn’t simply replace a conventional engine with a battery and electric motor. It calls for a design that meets new requirements and at the same time offers new possibilities.

Electric car 2.0: almost everything changes

Engineers, designers, technicians and material suppliers are having to rethink. The packaging, body construction and chassis of battery-electric vehicles are fundamentally different from conventional designs. The elimination of internal combustion engine, transmission, tank and exhaust system allows greater design freedom and requires changes, for example, to the energy-absorbing zones in the front end. At the same time, the high weight of the battery generates additional loads in all crash load cases.

Cost-efficient lightweighting solutions are needed to drive forward the mobility revolution. Robust and safe battery housings must ensure that electric cars at least match the safety standards of conventional vehicles. And with more efficient electric motors, the stored energy must be converted into greater range

Steel: “The Material of Mobility”

thyssenkrupp Steel has a high level of expertise in all aspects of electric mobility. Steel is crucial to the mobility revolution. It’s indispensable in generators and electric motors. And it’s the number one choice for body construction, battery housings and chassis solutions.

“selectrify®” is the name under which thyssenkrupp Steel has combined its e-mobility activities and a synonym for the enormous potential of innovative steel solutions for electric vehicles.

Aluminum can pack its bags: the selectrify® steel battery housing

Battery housing made of steel

Until now, the main function of a car’s safety design has been to provide the best possible occupant protection. This function now also includes protection of the battery. Battery housings have the task of protecting the most sensitive and expensive component of an electric vehicle – the battery system with battery cells, battery management system and thermal management. This is not just a matter of crash or intrusion protection: fire safety, electromagnetic shielding and corrosion protection are also key criteria.

The selectrify®-battery housing is a newly developed steel design offering excellent performance. It consists of an enclosure with a frame, connection profile, upper and lower support arms, underride guard and cover. It is available in a wide range of patented designs and is almost weight-neutral compared with aluminum. The selectrify®-battery housing proves that lightweighting, safety and fire protection can be combined – and at the same time allow high cost savings.

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Advantages of selectrify® battery housings

How steel gets EVs into shape: the selectrify® reference structure

Reference structure

The selectrify® reference structure represents the virtual body of an electric vehicle. It demonstrates the radical changes in the body-in-white of innovative electric cars.

The selectrify® reference structure for safe, weight-optimized electric vehicles illustrates the enormous potential of high-strength steels and new steel technologies. Its new ideas for materials and applications have been verified using the same tools and methods used by leading automotive developers. The longitudinally scalable reference structure takes the new requirements into account.

For example, a large underfloor battery means longer wheelbases, while compact electric motors allow shorter overhangs. In addition to new latitude for vehicle design, complex geometries will give way to simpler structural components and profiles. At the same time, rockers and B-pillars will have to meet stiffer structural requirements

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How steel powers electric motors: the selectrify® powertrain

How steel powers electric motors: the selectrify® powertrain

Another product from the selectrify® portfolio is used in the powertrain: powercore® electrical steel. thyssenkrupp Steel is European market leader in grain-oriented and non-oriented electrical steel. The high-purity soft magnetic iron-silicon alloy powercore® is found in virtually every electric motor. Use in the automobile places particularly high demands on electric motors. While speeds of around 4,000 rpm are usual in classic applications such as drills, electric vehicle motors reach speeds up to 20,000 rpm.

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Steel: at the heart of the mobility revolution

Steel: at the heart of the mobility revolution

Steel is at the heart of generators, transformers and electric motors. The powercore® product range includes both grain-oriented electrical steel for use in energy distribution (transformers) and non-oriented grades for use in energy generation (generators) and utilization (motors). With intelligent powercore® solutions, thyssenkrupp Steel is making a valuable contribution to the energy revolution.

Also under development: functional coatings for cost-efficient stack construction by motor manufacturers and for lower noise levels. For example, the use of bondal® E in the stator of an asynchronous machine reduces electromagnetically induced noise levels by up to 10 dB(A). Further cost-intensive materials for noise reduction can thus be dispensed with.

Energy revolution – with solutions from thyssenkrupp Steel

Energy revolution – with solutions from thyssenkrupp Steel

To ensure that the climate targets set by the German government and the European Union can actually be achieved, the electricity for EVs must come from renewable energies.

Smart electricity distribution is needed, and storage capacities must be created. Also required is a major expansion of charging stations and the entire charging infrastructure.

The Electrical Steel business unit of thyssenkrupp Steel has the high-tech materials and smart solutions for this in its powercore® portfolio.

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No electromobility without steel

Andre Matusczyk

Steel is the most successful lightweight material today in the automotive industry. Nine out of ten vehicles in Europe are currently manufactured using a lightweight construction method in which steel is the dominant material. Steel also has ideal characteristics for electric vehicles and is used in drive motors as well as structural assemblies of contemporary EVs and plug-in hybrids. André Matusczyk, CEO of thyssenkrupp Steel’s Automotive business unit, talks about the challenges surrounding e-mobility and the role of steel in the automotive future.

Mr. Matusczyk, is it possible to build cars without using any steel at all?

No, impossible. Steel was, is and will always remain the ‘material of mobility’ and as such the core material in the automotive industry – even in the era of electromobility. That’s because steel combines great potential for lightweight design with excellent cost effectiveness. Let me back this up with a few figures: The structure of a present-day electric car, such as VW’s ID.4, weighs around 440 kilograms including the battery enclosure. The doors, hood and tailgate weigh another 120 kilos or so. Since aluminum offers no or only a minimal weight advantage in respect of the vehicle’s body structure, steel is generally the material of choice. In many cases, this also applies to the add-on parts, i.e., doors, hood, and tailgate. In addition, all EV drive motors require a large amount of electrical steel. Depending on the model and whether it’s a battery electric (BEV) or a plug-in hybrid vehicle (PHEV), between 20 and 90 kilos of electrical steel go into in each motor. There is no alternative to electrical steel for this specific purpose.

But when it comes to the battery housing in electric cars – which is so important from the point of view of safety – manufacturers don’t yet appear to be 100 percent convinced that steel is the right material for the job, do they?

There are, so to speak, historical reasons for this. The first electric vehicles built were actually standard conventional vehicles into which a heavy battery housing was retrofitted. It’s due to this approach and the need to keep the extra weight as low as possible that aluminum is still the go-to material for the battery housing, at least in Europe. That’s a pity, because our research has shown that steel is only minimally heavier and clearly a much cheaper and more sustainable alternative. I’m sure we’ll see more and more vehicles with battery housings made of steel or at least a blend of materials in upcoming generations. Because now it’s all about properly integrating the function of the battery housing into the vehicle body. This means designing the battery housing as part of the side-impact protection structure from the word go.

One aspect of electric cars hotly discussed is that of fire safety. How do you rate steel in this context?

High-performance batteries in cars demand extremely high standards in terms of safety. The individual battery cells must be protected against collision damage at all costs. Today’s ultramodern steels offer unbelievably high degrees of strength and can take on an important protective role for the battery in locations such as the side sills, the B-pillars and in other crash-relevant positions. However, if a car does actually catch fire, steel has a real trump up its sleeve: Steel only melts at temperatures above 1,425°C. Aluminum alloys on the other hand liquefy at temperatures as low as 500°C. An appropriately dimensioned steel cover for the battery is therefore capable of withstanding those decisive few minutes longer to give the rescue services the time they need to get people out and save their lives.

A general question: What makes steel so special for the construction of both electric and conventional vehicles?

Steel is available the whole world over and the manufacturing processes are not only safe, but have been tried and tested over decades. What’s more, steel can be recycled without impacting its quality and cars made of steel can be easily repaired anywhere in the world – unlike car bodies made of fiber-reinforced plastics, for example. But most importantly, today’s steels are extremely strong and offer great potential for lightweight design at an unrivalled cost/performance ratio. We call this “cost-effective lightweight design” – and steel is the absolute world-leader in this respect.

Which means lightweight design, safety, fire protection and cost-effectiveness can all be combined well with steel?

Yes, and more than that. Electric cars are not an end in themselves – we want to prevent emissions and protect the environment. While they have no tailpipe or pump out toxic exhausts, their production, of course, still results in environment-polluting emissions. So it’s important to take the environmental impact of production also into account when selecting materials. And this is where new steel concepts for battery housings come off very well. Compared to the aluminum-based solutions deployed today, they produce up to 50 percent less climate-killing CO2, at significantly lower cost, with only a slight increase in weight.

That sounds good, but you still face a number of challenges in development moving forward. What will be the main focal points in the next few years?

Even though we already have a wide range of highly suitable products, it’s still possible we’ll develop more new lightweight steels that will meet the needs of electromobility even better. This is what we’re working on together with our customers. With electrical steel, too, there’s still scope for further development and optimization. But the key thing is if we really want to realize clean mobility, at some point steel production will also have to be carbon-neutral. We have developed our own in-house technology to achieve this and have set ourselves very ambitious goals. By as early as 2030, we want to be able to supply the marketplace with a large share of carbon-optimized products and reduce our CO2 emissions by 30 percent. And we want to be carbon-free by 2045. This is not something that can be done just like that – the technology is extremely expensive and we’re Germany and Europe and not an island. We can only survive long term in the global market if the same rules apply to all steel producers. And this level playing field can only be brought about by politicians. At the same time, it must be clear to everyone that environmental protection and zero emissions do not come free of charge. However, we are certain that there is a greater willingness to pay for vehicles that are completely carbon-free in respect of both production and use.

Mr. Matusczyk, many thanks for this interview!

Contact Automotive – Body

ThyssenKrupp Contact

Dr. Jürgen J. Schramm


thyssenkrupp Steel Europe AG
Kaiser-Wilhelm-Strasse 100
47166 Duisburg, Germany

Telephone: +49 203 52-40221

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Contact Automotive – Powertrain

ThyssenKrupp Contact

Marco Tietz

Head of Technical Customer Service

thyssenkrupp Steel Europe AG
Kaiser-Wilhelm-Str. 100
47166 Duisburg

Telephone: +49 203 52-43853

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