Tweeler AB is a precision aluminium die casting company based in Stockholm, Sweden, specialising in custom mould design, HPDC, re-engineering, and global logistics.
The electric vehicle revolution is reshaping demand for aluminium die castings. EVs use significantly more cast aluminium than combustion vehicles — for lightweighting, thermal management, and structural integration.
Why Aluminium for EVs?
Weight is the central challenge in EV design. Every kilogram saved extends range or allows a smaller, cheaper battery. Aluminium offers roughly one-third the density of steel while providing good strength and excellent thermal conductivity — critical for managing heat from batteries and power electronics. Die casting allows complex, thin-walled aluminium parts to be produced at the volumes the automotive industry requires.
Battery Housings and Enclosures
The battery pack enclosure is one of the largest and most critical aluminium components in an EV. It must be lightweight, structurally rigid to protect the cells in a crash, sealed against water and dust (typically IP67 or higher), and thermally managed. Corrosion resistance is important here, making lower-copper alloys like A360 attractive.
Electric Motor Components
EV motors generate significant heat that must be dissipated efficiently. Die cast aluminium motor housings with integrated cooling channels and fins manage this heat while keeping weight low. The tight tolerances achievable with HPDC are valuable here, as motor housings must maintain precise bearing alignment.
Power Electronics and Inverter Housings
Inverters, converters, and onboard chargers contain sensitive electronics that generate heat and require EMI shielding. Die cast aluminium housings provide both — excellent thermal conductivity to act as a heat sink, and inherent electromagnetic shielding from the conductive metal.
Charging Connectors and Infrastructure
Beyond the vehicle itself, the charging infrastructure relies heavily on die cast aluminium — charging gun housings, connector bodies, and charging station enclosures. These parts require durability, weather resistance, and good aesthetics, often combining die casting with anodizing or powder coating.
Thermal Management Components
EVs depend on sophisticated thermal management to keep batteries and electronics within their optimal temperature range. Die cast aluminium cold plates, cooling manifolds, and heat exchanger components are central to these systems.
The Rise of Megacasting
A major trend in EV manufacturing is megacasting (or gigacasting) — using enormous die casting machines (6,000–9,000+ tonnes of clamping force) to cast large structural sections of the vehicle body as a single part, replacing dozens of stamped and welded components. For most suppliers, the opportunity lies in the many smaller and medium-sized die cast components every EV requires.
Quality Requirements in the EV Supply Chain
- Tight dimensional tolerances for sealing and assembly
- Low porosity for pressure-tight and structural parts
- Corrosion resistance for parts exposed to road conditions
- Full material traceability and documented inspection
- Consistent quality across high production volumes
Working on an EV component? Tweeler AB produces aluminium die cast parts for battery housings, motor and inverter enclosures, charging hardware, and thermal management — with the tolerances, corrosion resistance, and traceability the EV supply chain demands.
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