A vent valve, a battery cell, a battery, and an electric device. The vent valve includes: a metal sheet, the metal sheet at least including a first through hole; a connecting member, the connecting member including at least one second through hole, where the connecting member is arranged on the metal sheet, and the first through hole is communicated with the second through hole; and a breathable membrane, the breathable membrane being arranged on the connecting member and covering the second through hole. By providing the connecting member, deformation of the breathable membrane during processing can be reduced, further preventing the deterioration of gas permeability caused by the deformation, thereby enhancing the structural stability of the vent valve, prolonging the service life of the vent valve, while also helping improve the sealing performance of the vent valve and broadening the selection range of the breathable membrane materials.