A photovoltaic module, comprising: at least one cell string, wherein each of the at least one cell string includes a plurality of solar cell sheets, each of the plurality of solar cell sheets includes a substrate, the substrate has: a front surface, a back surface opposite to the front surface, a first passivation layer disposed on the front surface of the substrate, and a second passivation layer disposed on the back surface of the substrate, a plurality of bus bars disposed on a surface of the second passivation layer, wherein the plurality of bus bars are disposed at intervals along a first direction and extend along a second direction, and each of the plurality of bus bars includes a plurality of bonding pads disposed at intervals along the second direction and a bus connecting line; a plurality of welding strips, wherein two adjacent solar cell sheets in the plurality of solar cell sheets are connected to each other by one of the plurality of welding strips, and each of the plurality of welding strips is in electrical contact with a corresponding bus bar, and each of the plurality of welding strips includes a plurality of bending portions arranged continuously along the second direction, and an orthographic projection of a central line of each of the plurality of welding strips on a back surface of the solar cell sheet coincides with an orthographic projection of a central line of the corresponding bus bar on the back surface of the solar cell sheet and/or an orthographic projection of a central line of each of the plurality of bonding pads on the corresponding bus bar on the back surface of the solar cell sheet along the second direction; and at least one package layer and at least one cover plate, wherein the at least one package layer is disposed on a surface of the at least one cell string, the at least one cover plate is disposed on a surface of the at least one package layer away from the at least one cell string, the at least one package layer and the at least one cover plate are laminated; wherein each of the plurality of bonding pads is in electrical contact with two adjacent bending portions in the plurality of bending portions on each of the plurality of welding strips; characterized in that each of the plurality of bending portions includes a first bending portion in electrical contact with a corresponding bonding pad in the plurality of bonding pads and a second bending portion not in electrical contact with any of the plurality of bonding pads; along a third direction, the first bending portion is bigger than the second bending portion in size, and the third direction is perpendicular to a bending direction of each of the plurality of bending portions. at least one cell string, wherein each of the at least one cell string includes a plurality of solar cell sheets, each of the plurality of solar cell sheets includes a substrate, the substrate has: a front surface, a back surface opposite to the front surface, a first passivation layer disposed on the front surface of the substrate, and a second passivation layer disposed on the back surface of the substrate, a front surface, a back surface opposite to the front surface, a first passivation layer disposed on the front surface of the substrate, and a second passivation layer disposed on the back surface of the substrate, a plurality of bus bars disposed on a surface of the second passivation layer, wherein the plurality of bus bars are disposed at intervals along a first direction and extend along a second direction, and each of the plurality of bus bars includes a plurality of bonding pads disposed at intervals along the second direction and a bus connecting line; a plurality of welding strips, wherein two adjacent solar cell sheets in the plurality of solar cell sheets are connected to each other by one of the plurality of welding strips, and each of the plurality of welding strips is in electrical contact with a corresponding bus bar, and each of the plurality of welding strips includes a plurality of bending portions arranged continuously along the second direction, and an orthographic projection of a central line of each of the plurality of welding strips on a back surface of the solar cell sheet coincides with an orthographic projection of a central line of the corresponding bus bar on the back surface of the solar cell sheet and/or an orthographic projection of a central line of each of the plurality of bonding pads on the corresponding bus bar on the back surface of the solar cell sheet along the second direction; and at least one package layer and at least one cover plate, wherein the at least one package layer is disposed on a surface of the at least one cell string, the at least one cover plate is disposed on a surface of the at least one package layer away from the at least one cell string, the at least one package layer and the at least one cover plate are laminated; wherein each of the plurality of bonding pads is in electrical contact with two adjacent bending portions in the plurality of bending portions on each of the plurality of welding strips; characterized in that each of the plurality of bending portions includes a first bending portion in electrical contact with a corresponding bonding pad in the plurality of bonding pads and a second bending portion not in electrical contact with any of the plurality of bonding pads; along a third direction, the first bending portion is bigger than the second bending portion in size, and the third direction is perpendicular to a bending direction of each of the plurality of bending portions.