What Materials Are Used for Cylindrical Battery Can Manufacturing?

Battery cell housings might not grab headlines the way battery chemistry does, but the material chosen for a cylindrical battery can has a direct and measurable impact on performance, manufacturing efficiency, and long-term reliability. As demand for rechargeable batteries accelerates across electric vehicles, consumer electronics, and grid-scale energy storage, the question of what goes into cylindrical battery can manufacturing has become a genuinely strategic one for engineers and procurement teams alike.

Understanding the materials behind battery cans means understanding a complex interplay of mechanical properties, electrochemical compatibility, formability, and cost. This article breaks down the key materials in use today, explains what drives selection decisions, and looks at where material trends are heading as the industry scales.

Steel vs. aluminum: the two dominant battery can materials

The two primary materials used in cylindrical battery can manufacturing are nickel-plated steel and aluminum, and each brings a fundamentally different set of trade-offs to the table.

Nickel-plated steel has been the workhorse material for cylindrical battery cans for decades, particularly in alkaline and nickel-based rechargeable chemistries. Steel offers high tensile strength, excellent dimensional stability under pressure, and strong resistance to deformation during the deep drawing process. Its mechanical robustness makes it well-suited to the multi-stage forming sequences used in high-volume production. The nickel plating adds a critical layer of corrosion resistance and electrochemical compatibility, preventing unwanted reactions between the steel substrate and the cell’s internal chemistry.

Aluminum has gained significant ground in lithium-ion battery applications, especially in larger-format cylindrical cells such as the 4680 format now central to EV battery packs. Aluminum is substantially lighter than steel, offers good thermal conductivity, and is highly recyclable, making it attractive from both a performance and a sustainability standpoint. However, it requires different forming parameters and tooling strategies due to its lower yield strength and different work-hardening behavior compared to steel.

The choice between these two materials is rarely arbitrary. It flows directly from the battery chemistry, the intended application, the production volume, and the mechanical demands placed on the finished cell.

How material properties shape battery can performance

Material selection for battery cell housing goes well beyond what can be formed into a cylinder. The physical and chemical properties of the can material actively influence how the battery performs throughout its service life.

Mechanical strength and dimensional precision

A battery can must maintain its geometry under internal pressure generated during charge and discharge cycles. Steel’s higher tensile strength provides a natural advantage here, particularly for cells operating under demanding thermal and electrochemical conditions. Tight wall tolerances are essential: even small deviations in can geometry can affect electrode alignment, electrolyte distribution, and ultimately cycle life.

Thermal management

Heat dissipation is a critical factor in battery performance and safety. Aluminum’s superior thermal conductivity compared to steel helps move heat away from the cell core more efficiently, which is one reason it is favored in high-power applications where thermal management is a design priority. Steel cans, while less conductive, can be engineered with tighter wall thicknesses to partially compensate, and their strength allows for more aggressive internal cell designs.

Electrochemical compatibility

The can material must not react with the electrolyte or the electrode materials inside the cell. This is why bare steel is almost never used without surface treatment. Aluminum is naturally compatible with many lithium-ion electrolyte systems, while steel requires the nickel plating layer to achieve the same electrochemical inertness. Any compromise in surface quality or coating integrity can accelerate internal corrosion and reduce cell longevity.

Nickel plating and surface treatment considerations

For steel battery cans, the nickel plating is not a cosmetic feature. It is a functional engineering requirement that directly determines the can’s suitability for use in a live electrochemical cell.

Nickel-plated steel strip, typically supplied as a coil, forms the starting material for the deep drawing process used in battery can deep drawing. The plating must be uniform in thickness, free of pinholes, and capable of surviving the mechanical stresses of multi-stage forming without delaminating or cracking. Any surface defect that exposes the underlying steel substrate creates a potential site for corrosion or unwanted electrochemical activity inside the finished cell.

The nickel layer also plays a role in weldability. Battery can lids and terminals are typically laser-welded to the can body, and the nickel surface facilitates consistent, high-quality weld joints. Surface cleanliness and coating consistency are therefore quality-critical parameters that must be controlled from incoming material inspection through every stage of the forming process.

For aluminum cans, surface treatment requirements differ. Aluminum naturally forms a thin oxide layer that provides some protection, but additional treatments such as anodizing or specific cleaning protocols may be applied depending on the cell chemistry and the manufacturer’s specifications. Lubrication management during forming is also more involved with aluminum, as the material’s tendency to gall or pick up on tooling surfaces requires careful process control.

How metal forming technology affects material selection

The forming process and the material are deeply interdependent. Choosing a battery can material without considering the manufacturing process, and vice versa, leads to suboptimal outcomes in quality, yield, and production cost.

The deep drawing process for cylindrical battery cans typically begins with a coil of material fed into a press system. A cup is formed in the first stage, and the part then progresses through multiple drawing steps, each reducing the diameter and increasing the wall height, until the target geometry is achieved. For standard cylindrical cells, this typically involves around four drawing steps, followed by calibration, and potentially additional operations such as beading or embossing to add functional features to the can body.

Steel and aluminum respond differently to this sequence. Steel’s higher work-hardening rate means that intermediate annealing steps are sometimes required in long draw sequences to restore ductility and prevent cracking. Aluminum, while more ductile in many respects, requires tighter control of blank-holder forces and lubrication to prevent wrinkling or tearing, particularly as wall thicknesses decrease in pursuit of higher energy density.

The precision of the press system directly affects how tightly the tolerances on the finished can can be held. Servo-driven press technology, which allows programmable control of ram velocity and force throughout the stroke, offers significant advantages here. The ability to optimize the forming curve for a specific material and geometry reduces springback, minimizes scrap, and extends tooling life. This matters especially when working with the thinner-walled cans increasingly demanded by the servo press technology for EV battery formats.

Material trends driven by EV and energy storage demand

The rapid scaling of electric vehicle production and stationary energy storage is reshaping material requirements for cylindrical battery cans in ways that will define the industry through the rest of this decade and beyond.

The shift toward larger-format cylindrical cells, most visibly the 4680 format, has accelerated interest in aluminum as a can material. The larger diameter and higher energy content of these cells place greater demands on thermal management, making aluminum’s conductivity advantage more significant. At the same time, the thinner walls enabled by advanced forming processes push material quality requirements higher, as there is less margin to accommodate surface defects or dimensional variation.

Steel remains strongly competitive, particularly for smaller cylindrical formats and for alkaline battery production where the material’s properties are well-matched to the application. Advances in high-strength steel grades and improved nickel plating processes continue to extend the performance envelope of steel cans, keeping them relevant even as the industry evolves.

Sustainability considerations are also becoming a genuine driver of material selection. Aluminum’s high recyclability aligns well with the circular economy goals that battery manufacturers and their automotive customers are increasingly committing to. The energy intensity of primary aluminum production is a counterbalancing factor, but as recycled aluminum content in supply chains grows, this concern diminishes.

What is clear is that material selection for battery cans will continue to be a dynamic decision, shaped by cell chemistry, format, production scale, and the capabilities of the forming technology available to manufacturers.

How H&T ProduktionsTechnologie supports cylindrical battery can manufacturing

We bring deep expertise in metal forming technology specifically suited to the demands of battery can production. Whether working with nickel-plated steel for rechargeable or alkaline cells, or aluminum for next-generation lithium-ion formats, our press systems are engineered to deliver the precision, process stability, and throughput that battery manufacturers require.

Our solutions for battery can manufacturing include:

Strip-fed transfer presses and multi-stage presses (MSP) that take a coil of material through the full deep drawing sequence, from first cup to finished can, in a single, continuous process
Cupping presses, specialized machines that convert wide metal strip directly into cups in one stroke, eliminating intermediate material handling and simplifying the production flow
Servo spindle press technology that provides programmable control over ram velocity and force throughout the stroke, enabling optimized forming curves for both steel and aluminum can materials
Integrated diagnostics and intelligent drive systems that support process monitoring, reduce scrap rates, and lower lifecycle costs across high-volume production runs
Tailored solutions and individual consulting, backed by comprehensive after-sales service to keep production running at peak performance

Our mechanical press solutions and servo-driven systems are designed for manufacturers who cannot afford to compromise on dimensional accuracy or production uptime. If you are evaluating forming technology for a battery can production line, or looking to optimize an existing process, we would welcome the conversation. Contact our team to discuss your specific application and find out how we can support your production goals.

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