New Energy Vehicle Aluminum Battery Case

70% recycled aluminum is used for molten aluminum mixing. Precise proportioning and control of alloy composition remove impurities and gases, improving the purity of the molten aluminum while balancing environmental requirements and material performance. Subsequent cleaning and drying ensure the material surface is free of oil and oxide layers, laying the foundation for forming and welding processes.

Various processes are employed depending on the Aluminum shell for lithium iron phosphate prismatic cells structure, including stretch forming, extrusion forming, and integrated die casting. Grades such as 3003-H14 can be stretched in one step, eliminating the need for bottom welding. Large outer shells utilize a segmented forming followed by an integrated welding process, with forming accuracy controlled within ±0.3mm.

The core technologies employed are friction stir welding and cold metal transfer (CMT) welding. Friction stir welding uses different needle lengths and precise parameter settings to avoid welding deformation, eliminating the need for subsequent adjustments. CMT welding significantly reduces heat input and welding stress, ensuring weld strength and sealing, and avoiding molten droplet spatter and weld defects common in traditional welding.

After cleaning, pickling, and passivation, surface treatments such as anodizing and PVC spraying are available. Anodizing forms a dense oxide film, improving corrosion resistance and insulation; PVC spraying effectively resists impacts from gravel and mud, extending the lifespan of the lithium power cell aluminum shell.

The entire process is equipped with automated testing equipment, including non-destructive testing of welding quality, airtightness testing, and dimensional accuracy testing. A coordinate measuring machine is used to regularly calibrate the gauges to ensure that products meet drawing requirements, with an airtightness pass rate consistently above 95%.