The Battery Enclosure located in the chassis part is composed of an upper cover and a lower shell. The Battery Enclosure is the bearing part of the power battery of new energy vehicles, which is mainly used to protect the lithium battery from damage when it is impacted or squeezed by the outside world.
At present, in order to ensure the safety of chassis power battery, most pure electric vehicles will choose steel or aluminum alloy material as the protective shell of Battery Enclosure. Although it can protect the safety of the power battery to a great extent, it also faces the problem that the Battery Enclosure is self important, increasing meaningless servicing mass, increasing power consumption, reducing driving range, and even having different degrees of impact on the control of the vehicle.
Therefore, with the development of automobile energy saving, environmental protection and lightweight, there are many kinds of lightweight materials such as glass fiber reinforced composites, SMC sheet materials, carbon fiber reinforced composites and so on.
Compared with traditional metal materials, SMC materials have the following advantages
- High specific strength, high specific modulus. The specific gravity of SMC is 1.7-1.9g/cm3, which can be used to replace metal materials;
- SMC products have strong designability, and can be formed as a whole by optimizing the structure to reduce secondary assembly;
- Low thermal expansion coefficient and stable size;
- Corrosion resistance, SMC electrolyte resistance, acid resistance, alkali resistance than metal materials such as steel, aluminum is much better, never rust.
- Good shock absorption, shock resistance and low resonance;
- The insulation performance is better than that of metal materials;
- The flame retardancy can reach VO level.
Application of SMC composite material in automobile battery pack shell
SMC is an important and widely used semi-finished product of molded composite products. With its excellent mechanical strength, high rigidity, high flame retardancy, corrosion resistance, dimensional stability, UV resistance, low specific gravity and other superior properties, SMC is widely used in automotive body parts, structural parts and functional parts, such as automotive dashboard, steering gear, radiator system, door, hood, etc Li case cover and so on, the largest application is the body panel, accounting for 70% of SMC consumption, the fastest growth is structural parts and transmission parts.
The power battery pack accounts for a large proportion in the vehicle quality, and the battery pack design should consider not only the sealing, waterproof, dust-proof, anti-corrosion, but also the insulation, but also the heat dissipation and electrostatic shielding of the battery box. Because of the ratio, the choice of shell material and lightweight is particularly important.
SMC has excellent lightweight effect, low price, good corrosion resistance and good insulation. It is a popular lightweight alternative material for battery pack shell. SMC composite materials are used in BAIC C30, C33, GAC a3x, A51, Geely Dihao (parameter | picture) ev450, futuristic K50 (parameter | picture), GAC new energy GAC motor ge3 530, Changan second generation escape (parameter | picture) EV battery pack shell.