While much of the conversation in electric vehicle production still centres on battery technology, metal innovation in mass production casting and bespoke alloy development at the prototyping stage are also vital.

In this article, we take a look at the role of aluminium alloys in electric vehicle manufacturing, why they matter for EV castings and how they can be used for large-scale prototyping.

Electric Vehicle Production Requires Innovation in Metals and Alloys

Battery materials like cobalt, nickel and manganese have long held the spotlight in EV and low-emission vehicle manufacturing, with their influence on range, cost and charging performance. However, when developing EV components, there are other metals that can play equally important roles across the wider range of electric vehicle components.

For example:

• Steel supports increased ductility and high strength, allowing the thickness of parts to be reduced (important for weight reduction).
• Copper appears across motors, batteries and wiring systems, where its conductivity and reliability remain essential.

To complement these materials, there is a need for alloys to also offer low-density, high-strength features. Aluminium provides these benefits, making it central to EV manufacturing.

What Is the Role of Aluminium Alloys for EV Castings?

Aluminium is widely used in EV manufacturing, due to its ability to create almost unlimited alloys, which are optimised for specific properties. Its low density helps reduce weight, while strength and castability make it ideal for high-integrity EV castings.

• Aluminium alloys are currently used in:
• EV battery trays
• Hybrid engine blocks
• Prototyping MLP components
• Lightweighting development
• Large-scale automotive castings that reduce part count.

When refining a design, the ability to create bespoke alloys offers control over strength, elongation, machinability and thermal behaviour. This flexibility is especially important during prototyping.

EV Prototyping with MLP Aluminium Alloys

Prototyping, and the associated alloy innovation, is a vital stage in EV manufacturing; demonstrating technology readiness level (TLR), proof of concept, design optimisation, functionality and validating safety before expensive, high-investment mass production of EV components with other casting methods such as HPDC.

Bespoke aluminium alloys enable properties such as strength, elongation, machinability and yield strength to be maximised at the prototyping stage, creating MLP castings which conform to the same properties as the metals and alloys specified for use in mass production.

Process modelling simulation is also important at this stage, testing and simulating alloy combinations to achieve desired material properties and function.

Aluminium Alloy EV Castings for Lightweighting

Electric vehicle components need to be lightweight. Aluminium alloys enable the creation of strong yet lightweight castings that support the heavy loads associated with battery systems while helping extend vehicle range.

As well as increasing battery range, this ability to lighten the weight can also reduce cost, removing unnecessary material in the casting.

How Aluminium Alloys Enable Large-Scale EV Castings

With the right aluminium alloy, large-scale EV castings that minimise post-processing and maintain ductility and conductivity can be produced. This is especially valuable when reducing part count and simplifying assemblies.

Using MLP prototypes, you can prove concepts for large thin-walled castings (around 2.5 mm) up to 1.5 m in size. These castings help reduce welding, streamline structures and improve weight distribution. Projects like IDRA’s Giga Press castings show how prototype validation supports future high-volume EV manufacturing.

In Conclusion

Battery development will remain a priority, but accelerating electric vehicle production also requires continued innovation in aluminium alloys and EV castings. But innovation in aluminium alloys used in automotive castings is also key, allowing MLP prototypes to be created, as well as achieving large-scale, lightweight aluminium structural castings that are optimised for EV properties such as ductility and strength.

Want to know more? Download our free ebook Making EV Components with Sand Casting.