With energy saving and emission reduction, the environmental protection concept of green travel is deeply rooted in the hearts of the people. In recent years, more and more new energy vehicles have entered the public family. The core energy that provides power for new energy vehicles is the power battery system, which is also one of the most important components of new energy vehicles.
The material requirements for power battery system shell
As the carrier of the battery module, the power battery system shell plays an important role in the stable operation and safety protection of the battery module. Therefore, there are three extremely high requirements on which material is selected as the power battery casing.
1) The power battery shell is formed by stamping, the deformation is large, the stamping process is complex, the mold design is precise, and the performance of the material is one of the most important basic conditions for the success of stamping. It must have good deep drawing performance, and the mechanical properties must be stable. within the requirements.
2) In order to effectively protect the internal battery structure, under the premise of ensuring the necessary plasticity, the power battery shell must also have sufficient strength and hardness.
3) In order to adapt to different use environments and ensure the service life of the battery, the power battery shell material must have good corrosion resistance and chemical stability.
Why is aluminium used in battery casing?
At present, most of the power battery shell materials on the market are made of 3003 aluminum alloy, which can not only ensure the strength, stiffness and collision safety requirements, but also ensure the cruising range of new energy vehicles.
3003 aluminum alloy is a typical alloy of Al-Mn rust-proof aluminum. Its outstanding feature is good corrosion resistance, similar to pure aluminum. Its strength is higher than that of pure aluminum, with high plasticity and good deep-drawing performance. It is widely used in chemical equipment, civil hardware and other places that need to be processed and formed. It is also suitable for places with good corrosion resistance and medium strength.
At the same time, the density of aluminum is only 1/3 of that of steel, so the weight of the aluminum shell is lighter than that of the steel shell, which is more conducive to reducing the weight of the vehicle itself, reducing the energy consumption of the vehicle, and improving the cruising range of the new energy vehicle.
At present, the global penetration rate of new energy vehicles is increasing year by year, but the overall penetration rate is not high, and there is still a very high room for growth. With the rapid development of new energy vehicles such as Tesla and BYD, electrification has become the main trend of global automobile development. Looking forward to the next few decades, the sales of new energy vehicles, mainly pure electric vehicles and hybrid vehicles, will continue to maintain a high growth rate, thus promoting the development of the battery industry.