Battery top cover assembly machining device and method and battery top cover assembly

The invention provides a battery top cover assembly machining device and method and a battery top cover assembly, and relates to the technical field of battery production, the battery top cover assembly comprises a top cover plate and a pole column, the device comprises a rotary workbench, a mold is arranged on the rotary workbench, and a containing cavity for containing the battery top cover assembly is formed in the mold. When the rotary worktable rotates, the mold is driven to pass through the first station, the second station and the third station in sequence; in the first station, the top cover plate and the pole column are placed in the accommodating cavity; in the second station, primary riveting pressing is conducted on the pole through the mold, so that an insulating cavity is formed between the battery top cover assembly and the mold, and an insulating part is obtained in the insulating cavity through injection molding; and in the third station, carrying out secondary riveting on the post terminal t