ELECTRIC VEHICLE BATTERY CASE MANUFACTURING METHOD

An electric vehicle battery case manufacturing method including a first cycle performing operation of sequentially performing a unit assembly preparing step (S), a first welding step (S), a first machining step (S), and a first inspection step (S), wherein the step (S) performs a process of preparing unit parts through aluminum extrusion and machining and then welding each sub-assembly, the step (S) performs a process of assembling the sub-assemblies produced through the step (S) and then performing metal inert gas (MIG) welding or friction stir welding (FSW), the step (S) performs a process of performing machining or hole machining on a welding bead part and a distorted surface of a product assembled through the step (S), and the step (S) performs a process of conducting a leak test on the product corrected through the step (S).