Low-pressure casting process of high-strength battery pack for new energy vehicle

The invention belongs to the technical field of metal alloys, and relates to a low-pressure casting process of a high-strength battery pack for a new energy vehicle, a strengthened aluminum alloy is subjected to smelting, casting, shaping, trimming removal, inspection, surface preprocessing and product testing, and the strengthened aluminum alloy comprises the following elements in percentage by mass: 6.5-7.5% of Si, 0.35-0.45% of Mg, 0.1-0.2% of Ti, less than or equal to 0.12% of Fe, 0.3-0.6% of Mn, 0.2-0.5% of Cu, less than or equal to 0.05% of Zn and the balance of Al; in the smelting process, aluminum ingots and waste materials are smelted according to the feeding ratio being larger than or equal to 8: 2, the temperature in a furnace ranges from 710 DEG C to 755 DEG C, and after refining, standing and heating, molten aluminum is discharged when the temperature of the molten aluminum reaches 740 DEG C to 755 DEG C; in the casting process, the temperature of molten aluminum is 705 +/-10 DEG C, the pressure