Every kilogram an electric vehicle carries costs range. And hardly any assembly weighs as much as the battery pack — in many EV models it is 400 to 700 kilograms. The enclosure that surrounds, protects and supports the cells accounts for a considerable share of that weight. This is exactly where a development is emerging that shows where lightweighting in electromobility is heading: the battery enclosure made of carbon-fiber-reinforced plastic (CFRP). At SGS Schach Global Solutions we follow this topic closely — not because we carry battery enclosures in our portfolio, but because it is a clear example of the requirements that will be placed on the sourcing of CFRP and carbon components from China in the years ahead. In this article we put into context what the technology delivers and what matters when choosing a supplier.
The Weight Problem in the Electric Car
Range, driving dynamics and energy consumption of an EV depend directly on total weight. While the body and powertrain have been optimized over decades, the battery enclosure is a comparatively young component — and in most series-production vehicles still made of aluminum or steel. It has to fulfil several tasks at once: mechanically protect the cells, including in a crash, seal against water and gases, provide thermal insulation, and contribute to the stiffness of the vehicle structure. This multifunctionality makes the enclosure an ideal candidate for lightweight construction — because saving weight here gains range without having to touch the expensive cell chemistry.
What CFRP Delivers Compared to Aluminum and Steel
Depending on the design, a CFRP battery enclosure is around 40 percent lighter than a comparable construction in aluminum or steel. But the weight advantage is not the only argument. CFRP has a significantly lower thermal conductivity than metal — the pack is therefore better shielded against cold and heat, which has a positive effect on the service life and fast-charging behaviour of the cells. Added to this are corrosion resistance, high stiffness and considerable design freedom, because complex geometries can be formed directly in the component instead of being assembled from several sheet-metal parts. The fact that the Chinese manufacturer NIO already uses carbon battery enclosures in high-performance vehicles shows that the technology is production-ready. What has so far argued against widespread use are material and process costs — and that is precisely where the sourcing strategy becomes the decisive lever.
Why Sourcing Is the Real Bottleneck
CFRP components are expensive as long as they are sourced like metal parts. The unit price depends heavily on the manufacturing process — prepreg, RTM or wet pressing — as well as on cycle time, tooling design and fiber volume content. Two suppliers can submit quotes for the same component that differ by a factor of two — not because of differing quality, but because of differing process maturity. In recent years China has developed into a serious location for composite manufacturing: raw fiber, tooling and downstream processing are located close together, and there is a growing number of manufacturers with automotive experience. The catch is the spread. Alongside genuine specialists there are many operations that come from bicycle or consumer-goods carbon and underestimate the requirements of a crash-relevant structural component. Without a robust supplier assessment, the cost opportunity quickly becomes a quality risk.
What Matters When Sourcing CFRP from China
Anyone sourcing a CFRP structural component in China — whether an add-on part, a cladding part or a component for a new field of application — should follow the same path as for any safety-relevant automotive part, supplemented by the additional knowledge that composite manufacturing demands. It begins with supplier research focused on operations that demonstrably produce CFRP structural parts and not just visible-surface parts. This is followed by an on-site audit assessing tooling, process monitoring, curing, and destructive as well as non-destructive testing. Before the start of series production, tool release and initial sample inspection are part of the process, and the CATIA V5 data basis must be kept clean so that the component matches the OEM specifications exactly, regardless of where it is manufactured. This sequence is exactly our day-to-day business: we source CFRP and carbon components from China for German OEMs and suppliers and accompany the process from the first inquiry through to series production — in a way that captures the cost advantage from China without giving up control over quality and deadlines.
Conclusion: Lightweighting Is Decided in the Supply Chain
The CFRP battery enclosure is a good example of the fact that lightweight construction in the electric vehicle has long ceased to be a purely design topic and has become a question of the supply chain. The technology is available, the weight advantages are real — what decides profitability is the choice of the right supplier and a sourcing process that catches composite-specific risks early. This is exactly where we come in: with engineering expertise and a robust supplier network in China for the sourcing of CFRP and carbon components.
Are you planning to source a CFRP or carbon component from China? Write to us with a short component description and the planned quantities at m.schach@schach-global-solutions.com — we will get back to you within 24 hours with an initial assessment of feasibility, process and sourcing route.
