Precautions for Casting Aluminum Shell of New Energy Vehicle Power Battery
At present, new energy electric vehicles have become a key development direction for the automotive industry. The power battery shell is one of the core components of the new energy electric vehicle.
Its packaging process is very important in the production process of the power battery. Good packaging determines the safety and life of the battery. Therefore, selecting an optimal aluminum shell
material for the power battery and selecting the optimal packaging process according to the material characteristics are particularly important for the safety and life of the battery.
The shell materials of power batteries are generally divided into aluminum shell and steel shell. Currently, 3003 aluminum alloy is commonly used for battery car power battery shells because this material
has easy processing and molding, high temperature corrosion resistance, good heat transfer and conductivity. The aluminum shell of the 3003 aluminum alloy power battery can be stretched and formed
in one go, which eliminates the welding process at the bottom of the box compared to the stainless steel shell. Good plasticity, therefore it can be made into various shapes of shell products. Since
aluminum shells need to be extruded and stretched to produce various shapes of products, what should be paid attention to during the extrusion and stretching process when processing power battery
shells?
The stretching operation must be carried out when the power battery shell profile is cooled to below 50 degrees before it can be moved to the stretching frame. If the temperature is too high, stretching
will not only burn the human body and wool, but also present absolute waste products such as twists, twists, and poor functionality before and after aging because it cannot completely eliminate the
internal stress of the power battery shell profile. The stretching amount shall be controlled at 1%, and it shall be noted that if the stretching amount is too high, the head, middle and tail scale errors will
occur, the appearance of water ripple Fried Dough Twists marks, low elongation, high hardness and brittleness (low plasticity) will occur. Low tensile strength and hardness of the aluminum shell of the
power battery will result in low compressive strength and hardness, and even aging (quenching) cannot improve hardness, making the profile prone to arc-shaped twists and turns.
In order to control the stretching deformation and the scale change of the aluminum shell of the power battery very well, it is necessary to choose suitable specialized clamping pads and appropriate
methods. Especially for open ended materials, curved materials, cantilever materials, and zigzag shaped profiles, it is important to pay attention to the reasonable use of stretching clamps and pads.
Pay attention to the stress conditions of small feet, thin teeth, long legs, arc surfaces, inclined surfaces, openings, viewpoints, etc. of profiles with high aspect ratios, long cantilevers, large arcs, large wall
thicknesses, and strange shapes, to avoid defects such as partial or point scale deformation, twisting, and spiraling of profiles.
Due to the heat blocking effect of wool strips, those with high decorative surface requirements must flip up, down, back and forth more to facilitate uniform heat dissipation and reduce the transverse
bright spots caused by uneven heat dissipation and varying crystallinity. Especially for large wide surfaces and thick wall aluminum profiles, attention should be paid to extrusion.
During the process of picking, moving, and stretching, it is not allowed to collide, pull, stack, congest, or entangle with each other. A certain interval should be reserved between each other, and aluminum
alloy profiles that are prone to twists and turns and discharge lengths should be disposed of in a timely manner. If necessary, maintenance and disposal should be carried out between each other.
The battery packaging shell of electric vehicles is mainly used for packaging and protecting batteries. They come in different shapes and sizes, and like other automotive components, there are multiple choices in terms of materials, and competition among different materials is also fierce.
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