Implements strict requirements for the comprehensive material performance of blade battery shells for automotive batteries, adopts cold roll forming + high-frequency welding processes, overcomes ultra-thin aluminum shell welding technologies, and successfully developed ultra-long and ultra-thin battery aluminum shells with a wall thickness of 0.3–0.6mm. This effectively improves the heat dissipation efficiency of blade battery shells for automotive batteries, features lightweight, high precision, and high strength, enhances automotive battery performance and safety, and extends vehicle range, among other benefits.