The application is suitable for the photovoltaic technical field, and provides a battery
assembly and a
photovoltaic system, which comprises a first battery unit and a second battery unit arranged in sequence along a first direction, the first battery unit comprises a plurality of first battery pieces and a plurality of first
welding strips arranged on each first battery piece, and the second battery unit comprises a plurality of second battery pieces and a plurality of second
welding strips arranged on each second battery piece; the plurality of first
welding strips of the first battery unit and the plurality of second welding strips of the second battery unit are arranged in first axis symmetry, so that the welding strips of the battery
assembly can be quickly arranged; in the application, the first welding strip adjacent to the edge of the first battery unit is insulated from the first output
bus bar, and the first welding strip adjacent to the edge of the first battery unit does not need to be welded with the first output
bus bar, thereby avoiding the problem that the first welding strip adjacent to the edge of the first battery unit and the first output
bus bar are false-welded due to the limited space after the first output bus bar is bent.