Combinable metal piece capable of being used for metal shell of lithium battery

The utility model discloses a combinable metal piece for a lithium battery metal shell, which comprises a shell base, combined side plates, side plate clamping rails, movable side plates, a combined component and a fixed component, the combined side plates are symmetrically arranged above the two ends of the shell base, the side plate clamping rails are symmetrically arranged at the two ends of one side of each combined side plate, and the movable side plates are arranged on the fixed component. The movable side plates are symmetrically arranged above the two ends of the shell base and arranged between the combined side plates, one ends of the movable side plates are clamped in the side plate clamping rails, the combined assemblies are arranged at the two ends of the lower portions of the combined side plates, and the fixed assemblies are arranged on one sides of the combined side plates and arranged between the side plate clamping rails. The utility model belongs to the technical field of lithium battery she