With the development of new energy vehicles, the demand for large-size power battery cases has increased significantly. 3003 aluminium alloy strip is widely used for its ease of forming, excellent overall mechanical processing properties, good corrosion resistance, moderate strength with light specific gravity and strong resistance to bursting.
3003 aluminum strip
Raw material for power battery case--3003 aluminium alloy strip performance requirements
Power battery shells require a high level of overall material performance:
(1) The power battery case is formed by stamping, which has a large deformation, many stamping processes, complex stamping technology, precise mould design and is an asymmetric box stamping. The performance of the material is one of the most important basic conditions for the success of the stamping process and must have good deep-drawing properties and the mechanical properties must be stable within a strict range.
(2) In order to provide effective protection for the internal battery structure, the power cell shell must have sufficient strength and hardness, while ensuring the necessary plasticity.
3003 aluminum alloy power battery shell strip
(3) In order to adapt to different environments and to ensure the service life of the battery, the material used for the power cell shell must have good corrosion resistance and chemical stability.
Main technical quality indicators for 3003 aluminium alloy strips for power battery shells
The mechanical properties of 3003 aluminium alloy strips for power battery shells are shown in Table 1, and the strip thickness tolerances are shown in Table 2.
| Alloy | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Ear-making rate (%) |
| 3003-H14 | 135~175 | ≥135 | ≥4 | ≤4 |
Table 1: mechanical properties of 3003 aluminum alloy power battery case
| thickness (mm) | Thickness tolerance (mm) |
| >0.80~1.50 | ±0.015 |
| >1.50~3.00 | ±0.02 |
Table 2: 3003 Aluminum Alloy Power Battery Shell Strip Thickness Tolerance
The surface roughness of the 3003 aluminium strip is controlled at 0.20~0.35μm, and the surface is required to be bright and clean, without defects such as periodic sticky wounds and marks, no obvious bright or dark bands, no corrosion, penetrating porosity, pressure scratches, metal and non-metal indentations.