Battery housing and electronic cigarette, assembly method

A battery housing comprising a first casing and a second casing, wherein:

• a side wall of the first casing is provided with a limiting groove along an axial direction of the first casing, the limiting groove penetrates through inner and outer walls and an end surface of the first casing, a guiding rib is protrudingly provided on the outer wall of the first casing along the axial direction of the first casing;
• and
• an inner wall of the second casing is protrudingly provided with a limiting protrusion corresponding to the limiting groove along an axial direction of the second casing, a side wall of the second casing is provided with a guiding groove corresponding to the guiding rib along the axial direction of the second casing, the guiding groove penetrates through inner and outer side walls of the second casing and an end surface of the second casing;
• when the second casing is sleeved on the outside of the first casing, the limiting protrusion is engaged in the limiting groove, and the guiding rib is engaged in the guiding groove.