Technical application and processing technology integration for automobile lightweighting

 

With the rapid development of new energy vehicles and energy storage industries, the application ratio of aluminum alloy materials in key components such as body structure, energy storage battery shell (Aluminum Battery Cases, Pack Aluminum Housing, Lithium Cell Aluminum Shell) has been increasing. Aluminum alloy has become an important material for automobile lightweighting and power system structural parts due to its low density, high strength, recyclability, and excellent processing performance.

 

(1) Application of cast aluminum alloys

In automobile manufacturing, cast aluminum alloys are widely used in engine cylinder blocks, transmission housings, intake manifolds, suspension brackets, wheels, and brake system components. Commonly used alloying elements include Si, Cu, Mg, Mn, Zn, Li, etc., and a scientific multi-element ratio is used to form an alloy system with excellent comprehensive performance.

 

In the future, with the popularization of integrated design of chassis and energy storage systems of new energy vehicles, the casting accuracy and sealing performance of the Aluminum Prismatic Casing (square aluminum shell) and LFP Battery Aluminum Case (lithium iron phosphate battery aluminum shell) will become important indicators.

The new generation of casting processes, such as casting forging composite method and semi-solid forming method, are improving the application performance of aluminum alloys in high-strength and thin-walled structural parts.

(2) The role of deformed aluminum alloys in lightweight car bodies
Deformed aluminum alloys (including sheet and strip, extruded profiles, and forging materials) are widely used in car body panels, frames, cooling systems, and suspension parts. Its lightweight effect is significant: for example, an all-aluminum load-bearing body can reduce weight by more than 200kg compared to a traditional steel body.

In the field of new energy vehicle manufacturing, the body outer panels often use 6000 series alloys, the inner panels use 5052-O alloys, and the frame materials are mostly 5182-O alloys. These alloys also have high ductility, excellent weldability, and corrosion resistance.

Custom alloys, such as 6N01, 2036, and 2008 series, are also used in some structures to reinforce door frames and impact energy absorption structures.

 

Similar material systems are also widely used in the manufacture of high-strength battery casings, such as the Prismatic Cell Case and LiFePo4 Prismatic Battery Aluminum Cells, to ensure energy density and structural stability.

 

 

 

The three core elements of lightweight design include:

 

The use of lightweight materials (such as aluminum, magnesium, CFRP, and engineering plastics);

Structural design optimization;

Integration of advanced forming and joining technologies.

 

Aluminum alloy, with a density approximately one-third that of steel and superior energy absorption properties, has become the preferred lightweight metal material. Compared to traditional steel, aluminum can reduce weight by approximately 60% while maintaining comparable performance and absorbing approximately 50% more impact energy.

 

In the new energy vehicle manufacturing system, this type of high-strength aluminum material is also used in battery module housings, Pack Aluminum Housings (battery pack aluminum shells), and related energy compartment structures, along with precision shell materials such as 3003-H14 Aluminum Case (3003-H14 aluminum shell).

 

 

 

The widespread application of aluminum alloys in lightweight body and energy storage module shells also puts higher demands on connection processes.

 

(1) Self-piercing riveting (SPR)

The SPR process is a cold connection technology that can connect multiple metal plates without damaging the coating.

 

Advantages include:

Applicable to combinations of different materials and thicknesses;

Riveting strength is higher than spot welding.

No heat impact, environmentally friendly;

It can be used in combination with adhesive processes.

Currently, SPR has been widely used in the assembly of aluminum bodies and lithium cell aluminum shells (lithium battery cell aluminum shells) of new energy vehicles.

 

(2) Cold Metal Transfer Welding (CMT)

CMT is a low heat input MIG/MAG welding method that can weld aluminum plates with a thickness of only 0.3mm and can achieve steel-aluminum dissimilar metal welding.

 

This technology enables an Aluminum Case for a Lithium-ion Battery Pack to achieve a high-strength connection with different brackets and frames, while effectively controlling the generation of brittle phases and improving the life of welded joints.

 

(3) Laser Welding and Vacuum Die Casting Technology

Laser welding achieves high-precision weld seam control with high energy density and is widely used in the packaging process of Aluminum Prismatic Casing.

 

Vacuum die casting technology has been verified in the manufacturing of large aluminum structural parts and battery compartment shells for new energy vehicles. It can effectively eliminate pore defects and improve structural density and thermal conductivity.

 

 

 

Anti-collision beams: 6063 and 7029 alloys achieve high energy absorption and controlled deformation.

Large components: A combination of vacuum die-casting and liquid forging improves structural density and fatigue resistance.

Battery module structural components: LFP Battery Aluminum Case and Prismatic Cell Aluminum Shell are used to optimize heat dissipation, impact resistance, and module assembly compatibility.

 

 

Aluminum alloy composites (composite sheets, composite strips, and composite foils) are widely used in automotive heat exchange systems and energy storage system cooling components.

 

Their multi-layer composite structures (2–5 layers) offer excellent thermal conductivity, corrosion resistance, and weldability, making them suitable for the manufacture of battery cooling housings, BMS support structures, and thermal management modules.

 

Going forward, products like the 3003-H14 Aluminum Case and Aluminum Prismatic Casing will continue to optimize surface corrosion protection and molding precision, contributing to the long-term and stable operation of new energy vehicle structural components and energy storage systems.

 

 

The lightweighting trend in the automotive and energy storage industries is driving the use of aluminum alloys from traditional body parts to core components such as new energy battery casings, aluminum housings for packs, and LiFePo4 prismatic battery aluminum cells.

 

By integrating high-strength alloy systems, advanced welding connection technologies, and intelligent die-casting processes, aluminum cases for lithium-ion battery packs and prismatic cell cases are becoming key structural foundations for new energy equipment manufacturing, providing solid support for vehicle performance improvements and the transition to green manufacturing.