A separator assembly, comprising: a separator body, having a first surface and a second surface opposite to each other in a thickness direction of the separator body; electrical connecting plates, connected to the second surface of the separator body, wherein two or more electrical connecting plates are spaced apart from each other in a length direction of the separator body, and a through slot is provided on the separator body between two adjacent electrical connecting plates, extending from the first surface to the second surface in the thickness direction; and an output electrode plate mount, having a first end and a second end opposite to each other, the first end being connected to the second surface of the separator body, and the second end being positioned away from the second surface of the separator body in the thickness direction such that the output electrode plate mount is arranged as a cantilever, characterized in that, the output electrode plate mount comprises a connecting plate being configured to extend in the thickness direction, and an end of the connecting plate facing the separator body is connected to the separator body, the output electrode plate mount further comprises two side plates, and the two side plates are spaced apart from each other in the length direction of the separator body and respectively connected to the connecting plate, wherein the two side plates and the connecting plate enclose a mounting groove, the separator assembly further comprises an output electrode plate connected to the output electrode plate mount, and the separator assembly further comprises a fixing member for connecting the output electrode plate mount with the output electrode plate and being disposed on the mounting groove, wherein the output electrode plate comprises a first connecting plate and a second connecting plate connected to each other, the first connecting plate being disposed in the mounting groove and having a mounting opening through which the fixing member is configured to pass, and the second connecting plate being connected to the separator body and being connectable to an electrode lead of a unit cell. a separator body, having a first surface and a second surface opposite to each other in a thickness direction of the separator body; electrical connecting plates, connected to the second surface of the separator body, wherein two or more electrical connecting plates are spaced apart from each other in a length direction of the separator body, and a through slot is provided on the separator body between two adjacent electrical connecting plates, extending from the first surface to the second surface in the thickness direction; and an output electrode plate mount, having a first end and a second end opposite to each other, the first end being connected to the second surface of the separator body, and the second end being positioned away from the second surface of the separator body in the thickness direction such that the output electrode plate mount is arranged as a cantilever, characterized in that, the output electrode plate mount comprises a connecting plate being configured to extend in the thickness direction, and an end of the connecting plate facing the separator body is connected to the separator body, the output electrode plate mount further comprises two side plates, and the two side plates are spaced apart from each other in the length direction of the separator body and respectively connected to the connecting plate, wherein the two side plates and the connecting plate enclose a mounting groove, the separator assembly further comprises an output electrode plate connected to the output electrode plate mount, and the separator assembly further comprises a fixing member for connecting the output electrode plate mount with the output electrode plate and being disposed on the mounting groove, wherein the output electrode plate comprises a first connecting plate and a second connecting plate connected to each other, the first connecting plate being disposed in the mounting groove and having a mounting opening through which the fixing member is configured to pass, and the second connecting plate being connected to the separator body and being connectable to an electrode lead of a unit cell.