As is well known, the battery pack of electric vehicles accounts for about 30% of the total weight of the vehicle. The heavier the body, the higher the power consumption, and the range is naturally greatly reduced. In the current situation where battery technology is difficult to achieve disruptive breakthroughs in the short term, "lightweighting" has become a consensus among car companies to break through.
The density of aluminum alloy is only about one-third of that of steel, making it a perfect weight reducing material. Taking the current mainstream 5083 aluminum magnesium alloy in the industry as an example, using it to replace traditional Q235 steel plates to make battery module side panels and chassis guards can reduce the weight of a single module by 2-3 kilograms and the entire battery pack by 10-15 kilograms. From the perspective of the entire vehicle, for every 10% reduction in car weight, the power consumption for driving 100 kilometers can be reduced by about 6% -8%. This seemingly insignificant weight loss of over ten kilograms can effectively increase the vehicle's range by 5% -6%.
For new energy vehicle owners, beneath the chassis are battery packs worth tens of thousands of yuan and various high-voltage power lines. Once a bottoming out or foreign object collision occurs in complex road conditions, the consequences are unimaginable. The emergence of aluminum protective panels has perfectly resolved this hidden danger.
Firstly, it has excellent impact resistance. For example, the aviation grade "7 series aluminum" commonly used for the lower shell of battery packs was originally used as a material for manufacturing aircraft landing gear, with excellent hardness and ductility. When a vehicle encounters high-speed collisions with road teeth or flying rocks, the aluminum alloy protective plate can absorb and buffer the huge impact force through its controllable deformation, avoiding rigid damage directly transmitted to the fragile battery cells.
Secondly, the corrosion resistance is unparalleled. The chassis is exposed to rainwater, mud, snow melting agents, and even electrolytes all year round. A dense oxide protective film naturally forms on the surface of aluminum alloys, especially rust resistant aluminum such as 5083, which has much higher corrosion resistance than ordinary steel. Even in harsh marine atmospheres or chemical environments, it can be handled calmly, greatly extending the service life of the chassis.
In addition to being light and hard, aluminum alloy also has a unique physical advantage - excellent thermal conductivity. The thermal conductivity of aluminum is approximately three times that of steel. In the thermal management system of electric vehicles, the aluminum side plate closely attached to the battery cells can quickly transfer the heat generated by battery charging and discharging to the liquid cooling plate or air duct, effectively reducing the temperature difference between the battery cells.
This design not only maintains the optimal operating temperature of the battery and improves charging efficiency, but also delays the spread of "thermal runaway" of the battery at critical moments, providing valuable escape time for passengers. An excellent aluminum protective panel truly achieves both offensive and defensive capabilities.
The evolution of protective plates from traditional heavy steel plates to aviation grade aluminum alloys reflects the relentless pursuit of ultimate efficiency and safety in the new energy vehicle industry. Lightweight aluminum protective panels provide lighter weight, stronger protection, and better thermal conductivity, perfectly meeting the core demand of "weight reduction and efficiency improvement" for new energy vehicles. In the future, 'whoever gains lightweight will gain the world' will undoubtedly become the iron law of the new energy vehicle race, and aluminum alloy protective plates will undoubtedly be the most solid cornerstone on this track.