Production process of power battery lower box body and power battery lower box body

The invention relates to the technical field of battery box body production processes, and discloses a power battery lower box body production process and a power battery lower box body, the production process comprises the following steps: aluminum ingot smelting, blank preparation through die casting, first machining, second friction welding, third machining, fourth machining, water nozzle and explosion-proof valve installation, and support assembly; through first machining, second friction welding, third machining and fourth machining, machining such as surface treatment, drilling and tapping of the battery lower box body is achieved, and a cooling cavity is formed in the battery lower box body; the water nozzle and the explosion-proof valve can be assembled on the lower box body of the battery at the same time through the water nozzle and explosion-proof valve assembling equipment, so that the process of preparing the lower box body of the battery can be shortened; by means of the support assembling equip