Photovoltaikmodul

Abstract

Photovoltaic module (100) comprising: a first cell section (10) and a second cell section (20) arranged in a first direction (X), wherein the first cell section (10) and the second cell section (20) each have a front (11a) and a back (11b) facing opposite each other, and wherein an electrode is provided on the front (11a) and on the back (11b) of both the first cell section (10) and the second cell section (20); a busbar (30) arranged at least partially on the backs (11b) of the first cell section (10) and the second cell section (20); an insulating layer (40) arranged at least between the back (11b) of the first cell section (10) and the busbar (30); and a first solder strip (51) and a second solder strip (52);wherein the first solder strip (51) is arranged such that it bends from the front (11a) of the first cell piece (10) to the rear (11b) of the first cell piece (10) so that it is electrically connected between the electrode on the front (11a) of the first cell piece (10) and the busbar (30); and the second solder strip (52) is separately electrically connected to the electrode on the rear (11b) of the second cell piece (20) and the busbar (30).

Description

TECHNICAL AREA This application relates to the field of manufacturing technology for solar cells, in particular a photovoltaic module. BACKGROUND As an emerging energy source, solar energy offers several advantages compared to conventional fossil fuels, including being inexhaustible, clean, and environmentally friendly. Currently, one of the most important methods for harnessing solar energy is a solar cell assembly, which converts the received light energy into electrical energy and outputs it. The solar cell assembly can be a large-area cell assembly made up of multiple solar cells (also called photovoltaic cells or photovoltaic modules) connected in series, encapsulated, and arranged in an array. The solar cells absorb light energy, leading to an accumulation of charges of opposite polarity at the two ends of the cell, thereby generating a "photovoltaic voltage," also known as the "photovoltaic effect."Due to the photovoltaic effect, electrodynamic potentials are generated at both ends of the solar cell, converting light energy into electrical energy. In photovoltaic modules, solder strips and busbars are used to conduct the current collected by the cell segments to a junction box. The busbars play a crucial role in current conduction within the solar modules. In current technology, however, the busbar is positioned between two adjacent cell segments, meaning that the busbar and the cell segments are located in the same plane. Since the busbar occupies a portion of the photovoltaic module's surface, the effective area of ​​the module for sunlight absorption is reduced, thereby decreasing the area utilization rate and the module's power output. SUMMARY In light of the above, there is a need to provide a photovoltaic module that solves the problem that placing the busbars and cell pieces in the same plane reduces the area utilization rate and module power of the photovoltaic module. This application provides a photovoltaic module comprising: a first cell piece and a second cell piece arranged in a first direction, wherein the first cell piece and the second cell piece each have a front and a back facing opposite each other, and wherein an electrode is provided on the front and back of both the first cell piece and the second cell piece; a busbar arranged at least partially on the backs of the first cell piece and the second cell piece; an insulating layer arranged at least between the back of the first cell piece and the busbar; and a first solder strip and a second solder strip.wherein the first solder strip is arranged such that it bends from the front of the first cell piece to the back of the first cell piece, so that it is electrically connected between the electrode on the front of the first cell piece and the busbar; and the second solder strip is separately electrically connected to the electrode on the back of the second cell piece and the busbar. In some embodiments, the first solder strip comprises a first connecting segment, a first curved segment, and a second connecting segment, which are sequentially connected; the first connecting segment is arranged on a side of the front of the first cell piece that faces away from the back of the first cell piece; the second connecting segment is arranged on a side of the back of the first cell piece that faces away from the front of the first cell piece, and the first curved segment is arranged to bend in an arc shape. In some embodiments, a surface of the busbar near the second cell piece is connected to the electrode on the back of the second cell piece via the second solder strip. In some embodiments, the insulating layer comprises a first insulating section and a second insulating section; the first insulating section is arranged between the back of the first cell piece and the busbar; and the second insulating section is arranged between the back of the second cell piece and the busbar. The second solder strip is arranged so that it bends from one side of the second insulating section near the second cell piece to one side of the second insulating section furthest from the second cell piece, so that it is electrically connected to each of the electrodes on the back of the second cell piece and the busbar. In some embodiments, the second solder band comprises a third connecting segment, a second curved segment, and a fourth connecting segment, which are sequentially connected; the third connecting segment is arranged between the back of the second cell piece and the second insulating section; the fourth connecting segment is arranged on the side of the second insulating section facing away from the second cell piece; and the second curved segment is arranged to bend in an arc. The first curved segment and the second curved segment are placed on the same side of the busbar in a direction parallel to a plane in which the first cell segment is placed. In some embodiments, the second connecting segment and the fourth connecting segment are arranged on the same side of the busbar in a direction that runs parallel to a thickness direction of the first cell segment. In some embodiments, the second connecting segment is arranged on a side of the busbar facing away from the first insulating section, and the fourth connecting segment is arranged on a side of the busbar facing away from the second insulating section. Alternatively, the second connecting segment is arranged between the busbar and the first insulating section, and the fourth connecting segment is arranged between the busbar and the second insulating section. In some embodiments, the second connecting segment and the fourth connecting segment are arranged on different sides of the busbar in a direction parallel to the thickness direction of the first cell segment. In some embodiments, the second connecting segment is arranged on a side of the busbar facing away from the first insulating section, and the fourth connecting segment is arranged between the busbar and the second insulating section. Alternatively, the second connecting segment is arranged between the busbar and the first insulating section, and the fourth connecting segment is arranged on a side of the busbar facing away from the second insulating section. In some embodiments, the first connecting segment and the second connecting segment are spaced apart from each other in the first direction, with the distance between the first connecting segment and the second connecting segment in the first direction being between 0.5 millimeters and 3 millimeters. Additionally or alternatively, the first curved segment is spaced from a side edge of the first cell piece in a second direction perpendicular to the first direction and parallel to a plane in which the first cell piece is placed, with the distance between the first curved segment and the side edge of the first cell piece in the second direction being in the range of 0.3 millimeters to 2 millimeters. In the embodiments of this application, the busbar is arranged at least partially on the rear faces of the first and second cell segments. The first solder strip is arranged such that it bends from the front face of the first cell segment to the rear face of the first cell segment, thus establishing an electrical connection between the electrode on the front face of the first cell segment and the busbar. Compared to the prior art, where the busbar and the cell segments are placed in the same plane, in this application, by arranging the busbar at least partially on the rear face of the cell string, the area occupied by the busbar within the photovoltaic module is reduced, and the area of ​​the photovoltaic module receiving sunlight is increased, thereby increasing the effective power-generating area and improving both the area utilization rate and the module power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a first schematic perspective view of a photovoltaic module according to some embodiments of this application. Fig. 2 is a first schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 3 is a second schematic perspective view of a photovoltaic module according to some embodiments of this application. Fig. 4 is a second schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 5 is a third schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 6 is a fourth schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 7 is a fifth schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 8 is a schematic top view of a photovoltaic module according to some embodiments of this application.Fig. 9 is a first schematic sectional view of a photovoltaic module according to some embodiments of this application. Fig. 10 is a second schematic sectional view of a photovoltaic module according to some embodiments of this application. Fig. 11 is a third schematic sectional view of a photovoltaic module according to some embodiments of this application. Fig. 12 is a schematic sectional view of an insulating layer of a photovoltaic module according to some embodiments of this application. DETAILED DESCRIPTION When terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "upper", "lower", "inside", "outside", "clockwise", "counterclockwise", "axial direction", "radial direction", and "circumferential direction" appear in the description of this application, the orientation or position relationships indicated by these terms are based on the orientation or position relationships shown in the accompanying drawings. These terms are intended to facilitate and simplify the description of this application and do not indicate or imply that the device or element mentioned must have a particular orientation or be designed and operated in a particular orientation. Therefore, these terms should not be interpreted as limiting this application. When the terms “first” and “second” appear, they serve solely for descriptive purposes and are not to be understood as indicating a relative importance or a specific number of technical elements. Therefore, elements defined by “first” and “second” may explicitly or implicitly include at least one of these elements. When the description of this application refers to “several,” “several” means at least two, such as two or three, unless expressly stated otherwise. Where the terms “assemble”, “connect”, “attach”, and “fasten” appear in this application, these terms are to be understood in their broadest sense, unless expressly stated otherwise and limited. For example, they may refer to a permanent connection, a detachable connection, or an integrated connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interaction between two elements, unless expressly limited. Those skilled in the field should understand the specific meanings of the above terms in this application according to the specific situations. When this application uses descriptions such as "a first element is located on" or "under" a second element, this may mean that the first and second elements are in direct contact or that they are in indirect contact through an intermediary, unless expressly specified and limited otherwise. Furthermore, when the first element is described as "above," "above," or "on" the second element, this may mean that the first element is above or over the second element, or it may simply mean that the first element is on a higher horizontal plane than the second element. When the first element is described as "below," "underneath," or "below" the second element, this may mean that the first element is below or under the second element, or it may simply mean that the plane of the first element is lower than that of the second element. It should be noted that when an element is described as being "attached" or "arranged" to another element, it may be directly attached to that other element, or an intermediate element may be present. When an element is considered to be "connected" to another element, it may be directly connected to that other element, or there may be an intermediate element. Where applicable, the terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the sole implementation. Reference is made to Figs. 1, 2, 3, 4, 5, 6, 7 to 8. Fig. 1 is a first schematic perspective view of a photovoltaic module according to some embodiments of this application. Fig. 2 is a first schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 2 is a schematic side view of the photovoltaic module in Fig. 1. Fig. 3 is a second schematic perspective view of a photovoltaic module according to some embodiments of this application. Fig. 4 is a second schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 4 is a schematic side view of the photovoltaic module from Fig. 3. Fig. 5 is a third schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 6 is a fourth schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 7 is a fifth schematic side view of a photovoltaic module according to some embodiments of this application. Fig. 8 is a schematic top view of a photovoltaic module according to some embodiments of this application. Fig. 8 is a schematic top view of the photovoltaic module in Fig. 3. Fig. 9 is a first schematic sectional view of a photovoltaic module according to some embodiments of this application. Fig. 10 is a second schematic sectional view of a photovoltaic module according to some embodiments of this application. Fig. 11 is a third schematic sectional view of a photovoltaic module according to some embodiments of this application. Figs. 9, 10 to 11 are sectional views of a busbar section in Fig. 8 along a first direction X. Fig. 12 is a schematic sectional view of an insulating layer of a photovoltaic module according to some embodiments of this application. This application provides a photovoltaic module 100. The photovoltaic module 100 comprises a first cell section 10, a second cell section 20, a busbar 30, an insulating layer 40, a first solder strip 51, and a second solder strip 52. The first cell section 10 and the second cell section 20 are arranged in a first direction X. The first cell section 10 and the second cell section 20 each have a front 11a and a back 11b that are opposite to each other. Electrodes are provided on the front 11a and the back 11b of the first cell section 10 and the second cell section 20. The busbar 30 is arranged at least partially on the back 11b of the first cell section 10 and the second cell section 20. The insulating layer 40 is arranged at least between the back 11b of the first cell section 10 and the busbar 30.The first solder strip 51 is arranged such that it bends from the front 11a of the first cell section 10 to the rear 11b of the first cell section 10, thus establishing an electrical connection between the electrode on the front 11a of the first cell section 10 and the busbar 30. The second solder strip 52 is electrically connected to each of the electrodes on the rear 11b of the second cell section 20 and the busbar 30. In some embodiments, the photovoltaic module 100 comprises a laminate and a frame. The laminate includes a cover plate, a first adhesive film, several cell strands, a second adhesive film, and a backplate. Each cell strand comprises several cell segments connected in series. The cover plate, the first adhesive film, the multiple cell strands, the second adhesive film, and the backplate are laminated to form a laminate. The laminate is then assembled with the frame to form the photovoltaic module 100. However, it should be understood that the structure of the photovoltaic module 100 is not limited to this. In some embodiments, for example, the first and second adhesive films can each be selected independently of one another from ethylene-vinyl acetate copolymer adhesive films (EVA adhesive films), polyolefin elastomer adhesive films (POE adhesive films), polyethylene terephthalate adhesive films (PET adhesive films), polyvinyl butyral adhesive films (PVB adhesive films), EPE adhesive films (three-layer co-extruded adhesive films of EVA and POE), EP adhesive films (two-layer co-extruded adhesive films of EVA and POE), or other types of adhesive films, which can be selected as required and are not limited herein. In some embodiments, the cover plate is arranged, for example, on a side of the first adhesive film facing away from the cell pieces (a side of the front surfaces 11a facing away from the rear surfaces 11b). The cover plate can be made of a transparent material such as glass or a polymer. If the cover plate is made of glass, it can also be referred to as "photovoltaic glass," which has excellent light transmission and high hardness, allowing the cover plate, once bonded to the first adhesive film, to withstand significant daily temperature fluctuations and harsh weather conditions to protect the cell pieces. The glass used for the cover plate can be ultra-clear embossed photovoltaic glass, ultra-clear machined float glass, TCO glass, and other types of front-panel glass, which can be selected according to actual needs and are not limited herein. In some embodiments, the backplate is arranged, for example, on a side of the second adhesive film facing away from the cell pieces (a side of the backplate 11b facing away from the front 11a). The backplate also provides protection and support for the cell pieces. The backplate can exhibit excellent weather resistance, water resistance, corrosion resistance, insulating properties, etc. The backplate can not only insulate the photovoltaic module from the surrounding photovoltaic environment but also effectively protect and support the cell pieces, thereby increasing the impact resistance of the photovoltaic module. The backplate can be made of glass (e.g., rolled glass or ultra-clear rolled glass), TPT (polyvinyl fluoride composite film), thermoplastic elastomer (TPE), etc. For example, the photovoltaic module 100 can comprise several cell strings. The first cell segment 10 and the second cell segment 20 can refer to the end cell segments of two adjacent cell strings, but are not limited to this. The front sides 11a of the first cell piece 10 and of the second cell piece 20 refer by way of example to the sides of the first cell piece 10 and of the second cell piece 20 that are exposed to sunlight or are mainly exposed to sunlight. For example, the reverse sides 11b of the first cell piece 10 and of the second cell piece 20 refer to the sides of the first cell piece 10 and of the second cell piece 20 facing away from sunlight. For example, a first electrode 12a can be provided on the front sides 11a of the first cell segment 10 and the second cell segment 20. A second electrode 12b can be provided on the back sides 11b of the first cell segment 10 and the second cell segment 20. The first electrode 12a can be a positive or a negative grid, and the second electrode 12b can be the opposite positive or negative grid. In some embodiments, the first solder strip 51 can be electrically connected directly to the first electrode 12a on the front side 11a of the first cell section 10. In some embodiments, the first solder strip 51 can be electrically connected to the first electrode 12a on the front side 11a of the first cell section 10 by means of a first under-solder strip. In some embodiments, the first solder strip 51 and the first under-solder strip can be separate solder strips. In some embodiments, the first solder strip 51 and the first under-solder strip can be formed from a single piece or be the same solder strip. For example, a photovoltaic module can comprise 100 multiple cell strings. Each of these strings can contain several cell segments connected in series. For instance, the cell segments connected in series within the same cell string can be joined by a solder strip, but this is not the only possible connection method. For example, the busbar 30 is arranged at least partially on the back side 11b of the cell strand. In one thickness direction of the cell segments, the busbar 30 overlaps at least partially with the cell segments. In some embodiments, the busbar 30 is arranged completely on the back side 11b of the cell strand. In contrast to the prior art, in which the busbar and the cell pieces are placed in the same plane, this application exemplarily reduces the area occupied by the busbar 30 within the photovoltaic module and increases the area of ​​the photovoltaic module 100 that receives sunlight by at least partially arranging the busbar 30 on the back 11b of the cell string, thereby increasing the effective power generation area and improving both the area utilization rate and the module power of the photovoltaic module 100. For example, the insulating layer 40 is arranged at least between the back side 11b of the first cell piece 10 and the busbar 30, which can prevent a short circuit between the busbar 30 and the second electrode 12b on the back side 11b of the first cell piece 10. For example, the first solder strip 51 is arranged such that it bends from the front 11a of the first cell piece 10 to the back 11b of the first cell piece 10 in order to electrically connect the busbar 30 on the back 11b of the first cell piece 10 and the first electrode 12a on the front 11a of the first cell piece 10. Fig. 1 illustrates by way of example that the first direction X is perpendicular to a second direction Y and a plane in which the first direction X and the second direction Y lie is parallel to a plane in which the first cell piece 10 is placed. In the embodiments of this application, the busbar 30 is arranged at least partially on the rear side 11b of the cell string. The first solder strip 51 is arranged such that it bends from the front side 11a of the first cell segment 10 to the rear side 11b of the first cell segment 10, so that an electrical connection exists between the electrode on the front side 11a of the first cell segment 10 and the busbar 30.In contrast to the prior art, where the busbar 30 and the cell pieces are placed in the same plane, this application reduces the area occupied by the busbar 30 within the photovoltaic module and increases the area of ​​the photovoltaic module 100 that receives sunlight by at least partially arranging the busbar 30 on the back 11b of the cell string, thereby increasing the effective power generation area and improving both the area utilization rate and the module power of the photovoltaic module 100. In some embodiments, the first solder strip 51 comprises a first connecting segment 511, a first curved segment 512, and a second connecting segment 513, which are sequentially connected. The first connecting segment 511 is arranged on one side of the front face 11a of the first cell piece 10, facing away from the rear face 11b of the first cell piece 10. The second connecting segment 513 is arranged on one side of the rear face 11b of the first cell piece 10, facing away from the front face 11a of the first cell piece 10. The first curved segment 512 is arranged to bend in an arc. For example, the first curved segment 512 is arranged in such a way that it is bent in an arc shape, which not only enables the electrical connection of the first connecting segment 511 with the first electrode 12a on the front 11a of the first cell piece 10 and the electrical connection of the second connecting segment 513 with the busbar 30 on the back 11b of the first cell piece 10, but also reduces the risk of damage, such as a breakage of the first curved segment 512. In some embodiments, a surface of the busbar 30, as shown in Fig. 1 and Fig. 2, is connected near the second cell piece 20 via the second solder strip 52 to the electrode on the back 11b of the second cell piece 20. For example, the area of ​​the busbar 30 near the second cell section 20 is connected by the second solder strip 52 to the electrode on the back side 11b of the second cell section 20, as shown in Fig. 1 and Fig. 2. This means that the area of ​​the busbar 30 near the second cell section 20 is in contact with the second solder strip 52, and the second solder strip 52, in turn, is in contact with the electrode on the back side 11b of the second cell section 20, resulting in a simplified manufacturing process. However, it is understood that there may be a section of the electrode that does not overlap with the second solder strip 52, and in this case, the area of ​​the busbar 30 near the second cell section 20 can be in direct contact with this section of the electrode. It is noted that Fig. 2 illustrates that the second connecting segment 513 is connected to the busbar 30 at a point between the insulating layer 40 and the busbar 30. Alternatively, the second connecting segment 513 can be connected to the busbar 30 on a side of the busbar 30 facing away from the insulating layer 40. In some embodiments, the insulating layer 40, as shown in Figs. 3, 4, 5, 6 to 7, comprises a first insulating section 41 and a second insulating section 42. The first insulating section 41 is arranged between the rear side 11b of the first cell piece 10 and the busbar 30, while the second insulating section 42 is arranged between the rear side 11b of the second cell piece 20 and the busbar 30. The second solder strip 52 is arranged such that it bends from one side of the second insulating section 42 near the second cell piece 20 to one side of the second insulating section 42 furthest from the second cell piece 20, in order to be electrically connected to each of the electrodes on the rear side 11b of the second cell piece 20 and the busbar 30. In contrast to the embodiments shown in Figs. 1 and 2, in the embodiments shown in Figs. 3, 4, 5, 6 to 7, the second solder strip 52 is also arranged to bend. By bending the second solder strip 52 from the side of the second insulating section 42 near the second cell segment 20 to the side of the second insulating section 42 furthest from the second cell segment 20, it can be ensured that the overall thickness of the photovoltaic module 100 at the first cell segment 10 and the overall thickness of the photovoltaic module 100 at the second cell segment 20 can be maintained uniformly in a thickness direction perpendicular to the cell segments.This allows the busbar 30 to make a firmer contact with both the first solder strip 51 and the second solder strip 52, and the photovoltaic module 100 can maintain a uniform voltage when subjected to external forces, thereby reducing the risk of damage, such as breakage of the cell pieces. The insulating layer 40, for example, comprises the first insulating section 41 and the second insulating section 42. The first insulating section 41 is arranged between the back side 11b of the first cell piece 10 and the busbar 30. The first insulating section 41 and the second insulating section 42 can be separate or spaced-apart insulating film layers, or they can consist of an integrally formed or integrated structure. For example, the first insulating section 41 and the second insulating section 42 have the same thickness, so that the total thickness of the photovoltaic module 100 at the first cell piece 10 and the total thickness of the photovoltaic module 100 at the second cell piece 20 can be kept more uniform, which allows the photovoltaic module 100 to maintain a uniform tension when subjected to external forces, thereby reducing the risk of damage such as breakage of the cell pieces. In some embodiments, the second solder strip 52, as shown in Figs. 3, 4, 5, 6 to 7, comprises a third connecting segment 521, a second curved segment 522, and a fourth connecting segment 523, which are sequentially connected. The third connecting segment 521 is arranged between the rear side 11b of the second cell piece 20 and the second insulating section 42. The fourth connecting segment 523 is arranged on a side of the second insulating section 42 facing away from the second cell piece 20. The second curved segment 522 is arranged so that it bends in an arc. In a direction parallel to the plane in which the first cell piece 10 is placed, both the first curved segment 521 and the second curved segment 522 are positioned on the same side of the busbar 30. By way of example, the third connecting segment 521 is arranged between the rear side 11b of the second cell section 20 and the second insulating section 42, and the third connecting segment 521 can be directly electrically connected to the second electrode 12b on the rear side 11b of the second cell section 20. By way of example, in some embodiments, the third connecting segment 521 can be electrically connected to the second electrode 12b on the rear side 11b of the second cell section 20 by means of a second under-soldering strip. In some embodiments, the second soldering strip 52 and the second under-soldering strip can be separate soldering strips. In some embodiments, the second soldering strip 52 and the second under-soldering strip can be integral or formed from the same soldering strip. For example, the fourth connecting segment 523 is arranged on a side of the second insulating section 42 facing away from the second cell piece 20 and is connected to the busbar 30. In a direction parallel to the plane in which the first cell piece 10 is placed, both the first bent segment 512 and the second bent segment 522 are placed on the same side of the busbar 30. That is, orthogonal projections of the first bent segment 512 and the second bent segment 522 onto the plane in which the first cell piece 10 is placed are on the same side of an orthogonal projection of the busbar 30 onto the plane in which the first cell piece 10 is located, which can reduce manufacturing difficulties. For example, the first solder strip 51 and the second solder strip 52 can be bent in the same direction in the same bending process. In some embodiments, the second connecting segment 513 and the fourth connecting segment 523 are arranged in a direction parallel to the thickness direction of the first cell piece 10 on the same side of the busbar 30, as shown in Fig. 3, Fig. 4 and Fig. 5. For example, the second connecting segment 513 and the fourth connecting segment 523 are arranged in the direction parallel to the thickness direction of the first cell piece 10 on the same side of the busbar 30 and are connected or welded to the busbar 30 on the same side of the busbar 30 without requiring connections or welds on two sides of the busbar, thus simplifying the manufacturing process. In some embodiments, the second connecting segment 513, as shown in Fig. 3 and Fig. 4, is arranged on a side of the busbar 30 facing away from the first insulating section 41, while the fourth connecting segment 523 is arranged on a side of the busbar 30 facing away from the second insulating section 42. As shown in Fig. 3 and Fig. 4, both the second connecting segment 513 and the fourth connecting segment 523 are connected to the busbar 30 on the side of the busbar 30 facing away from the insulating layer 40. In some embodiments, the second connecting segment 513, as shown in Fig. 5, is arranged between the busbar 30 and the first insulating section 41, and the fourth connecting segment 523 is arranged between the busbar 30 and the second insulating section 42. For example, both the second connecting segment 513 and the fourth connecting segment 523 are connected to the busbar 30 at points between the busbar 30 and the insulating layer 40, as shown in Fig. 5. In some embodiments, the second connecting segment 513 and the fourth connecting segment 523, as shown in Fig. 6 and Fig. 7 and also with reference to Fig. 3, are arranged in the direction parallel to the thickness direction of the first cell piece 10 on different sides of the busbar 30. In the direction parallel to the thickness direction of the first cell segment 10, the second connecting segment 513 and the fourth connecting segment 523 are arranged, by way of example, on different sides of the busbar 30 and are each connected or welded to the busbar 30 on both sides. The first solder strip 51 and the second solder strip 52 can each fix the busbar 30 on both sides, so that the busbar 30 is less susceptible to detachment, which improves the reliability and mechanical properties of the photovoltaic module 100. In some embodiments, the second connecting segment 513, as shown in Fig. 6, is located on the side of the busbar 30 facing away from the first insulating section 41, and the fourth connecting segment 523 is located between the busbar 30 and the second insulating section 42. For example, the second connecting segment 513, as shown in Fig. 6, is connected to the busbar 30 on the side of the busbar 30 facing away from the first insulating section 41, and the fourth connecting segment 523 is connected to the busbar 30 at a point between the busbar 30 and the second insulating section 42. In some embodiments, the second connecting segment 513, as shown in Fig. 7, is arranged between the busbar 30 and the first insulating section 41, and the fourth connecting segment 523 is arranged on the side of the busbar 30 facing away from the second insulating section 42. For example, the second connecting segment 513, as shown in Fig. 7, is connected to the busbar 30 at a point between the busbar 30 and the first insulating section 41, and the fourth connecting segment 523 is connected to the busbar 30 on the side of the busbar 30 furthest from the second insulating section 42. In some embodiments, the first connecting segment 511 and the second connecting segment 513 are spaced apart from each other in the first direction X, as shown in Fig. 8 and also with reference to Fig. 3, wherein the distance between the first connecting segment 511 and the second connecting segment 513 in the first direction X is between 0.5 millimeters and 3 millimeters. As an example, the first connecting segment 511 and the second connecting segment 513, as shown in Fig. 8, are spaced apart from each other in the first direction X. That is, orthogonal projections of the first connecting segment 511 and the second connecting segment 513 onto the plane on which the first cell piece 10 is located are spaced apart, so that the first curved segment 512 has a certain length in the first direction X, which reduces the thickness of the photovoltaic module 100 in this area, thereby reducing the risk of breakage of the first curved segment 512 and the risk of microcracks in the cell pieces. For example, the distance between the first connecting segment 511 and the second connecting segment 513, as shown in Fig. 8, is between 0.5 millimeters and 3 millimeters in the first direction X. That is, the distance between the orthogonal projections of the first connecting segment 511 and the second connecting segment 513 onto the plane on which the first cell piece 10 is located is in the range of 0.5 millimeters to 3 millimeters, as indicated by a first distance d1 in Fig. 8. The first distance d1 can, for example, be a value selected from 0.5 millimeters, 1 millimeter, 1.5 millimeters, 2 millimeters, 2.5 millimeters and 3 millimeters. In some embodiments, the third connecting segment 521 and the fourth connecting segment 523 are spaced apart from each other in the first direction X, wherein the distance between the third connecting segment 521 and the fourth connecting segment 523 in the first direction X is between 0.5 millimeters and 3 millimeters. In some embodiments, the first curved segment 512, as shown in Fig. 8, is spaced from a side edge of the first cell piece 10 in the second direction Y, wherein the distance between the first curved segment 512 and the side edge of the first cell piece 10 in the second direction Y is between 0.3 millimeters and 2 millimeters. For example, the first curved segment 512, as shown in Fig. 8, is spaced from the side edge of the first cell piece 10 in the second direction Y, wherein the distance between the first curved segment 512 and the side edge of the first cell piece 10 in the second direction Y is between 0.3 millimeters and 2 millimeters. That is, the orthogonal projection of the first curved segment 512 onto the plane on which the first cell piece 10 is located is spaced from the side edge of the first cell piece 10, wherein a distance between the orthogonal projection of the first curved segment 512 onto the plane on which the first cell piece 10 is located and the side edge of the first cell piece 10 is in the range of 0.3 millimeters to 2 millimeters, as defined by a second distance d2 in Fig.8 is specified so that the short circuit between the first solder strip 51 and structures on the first cell piece 10 that do not require a connection can be prevented, and a buffer space for the first bent segment 512 is provided when external forces are applied, thereby reducing the risk, such as a breakage of the first cell piece 10. In some embodiments, as shown in Fig. 8, the second curved segment 522 is spaced from the side edge of the second cell piece 20 in the second direction Y, wherein the distance between the second curved segment 522 and the side edge of the second cell piece 20 in the second direction Y is in the range of 0.3 millimeters to 2 millimeters. That is, the orthogonal projection of the second curved segment 522 onto the plane on which the second cell piece 20 is located is spaced from the side edge of the second cell piece 20, wherein the distance between the orthogonal projection of the second curved segment 522 onto the plane on which the second cell piece 20 is located and the side edge of the second cell piece 20 is in the range of 0.3 millimeters to 2 millimeters, as defined by a second distance d2 in Fig.8 is specified so that the short circuit between the second solder strip 52 and structures on the second cell piece 20 that do not require a connection can be prevented, and a buffer space for the second curved segment 522 is provided when external forces are applied, thereby reducing the risk, such as a breakage of the second cell piece 20. The second distance d2 can, for example, be any value of 0.3 millimeters, 0.5 millimeters, 0.8 millimeters, 1 millimeter, 1.2 millimeters, 1.5 millimeters, 1.8 millimeters or 2 millimeters. In some embodiments, as shown in Figs. 9, 10 to 11, several grooves 31 are provided on a surface of the busbar 30 near the first solder strip 51 and / or the adjacent second solder strip 52. The first solder strip 51 and / or the second solder strip 52 is at least partially received in the corresponding groove 31, whereby the busbar 30 has the function of fixing the first solder strip 51 and / or the second solder strip 52, or the first solder strip 51 and / or the second solder strip 52 has the function of fixing the busbar 30, thus improving the reliability and mechanical properties of the photovoltaic module 100. In some embodiments, the busbar 30, as shown in Fig. 11, can exemplarily have a wave-shaped form, wherein the grooves 31 are defined by wave-shaped troughs. In some embodiments, an adhesive layer 61 can be arranged, for example, between the busbar 30 and the insulating layer 40, as shown in Fig. 10, when no soldered tape connection is provided between the busbar 30 and the insulating layer 40. The adhesive layer 61 connects the busbar 30 to the insulating layer 40, thereby improving reliability and mechanical strength, preventing misalignment or other displacement of the insulating layer 40, and improving the reliability and mechanical properties of the photovoltaic module 100. For example, in the embodiment shown in Fig. 4, the adhesive layer 61 can be arranged between the busbar 30 and the insulating layer 40; in the example shown in Fig. 6, between the busbar 30 and the first insulating section 41; or in the example shown in Fig. 7, between the busbar 30 and the second insulating section 42. It should be noted that the insulating layer 40 can comprise a first under-insulating film 401, a second under-insulating film 402, and a third under-insulating film 403, which are arranged stacked as shown in Fig. 12. The first under-insulating film 401 and the third under-insulating film 403 are made of elastomeric materials. The second under-insulating film 402 is, for example, inserted between the first under-insulating film 401 and the third under-insulating film 403. The second under-insulating film 402 can, for example, be made of a non-elastomeric material to provide insulation and support. The first under-insulating film 401 and the third under-insulating film 403 are, for example, made of elastomeric materials, thereby achieving a buffer function.If, for example, the busbar 30 is exposed to external shocks, the first under-insulating film 401 and the third under-insulating film 403 can buffer the external stresses and thus prevent damage to the cell pieces. It should be noted that in some embodiments, with reference to Fig. 8, the insulating layer 40 can extend on the back side 11b into a gap between the second solder strip 52 and a side edge of the second cell piece 20 away from the first cell piece 10 in the first direction X, and that the insulating layer 40 on the back side 11b can extend into a gap between the first solder strip 51 and a side edge of the first cell piece 10 away from the second cell piece 20 in the first direction X, thereby buffering the external impacts and protecting the edges of the cell pieces. This application provides a photovoltaic module comprising: a first cell and a second cell, each having a front and a back that are opposite to each other and on which an electrode is provided; a busbar that is arranged at least partially on the backs of the first and second cell; an insulating layer that is arranged at least between the back of the first cell and the busbar; and a first solder strip and a second solder strip. The first solder strip is arranged to bend from the front to the back of the first cell to establish an electrical connection between the electrode on the front of the first cell and the busbar. The second solder strip is separately electrically connected to the electrode on the back of the second cell and the busbar.

Claims

Photovoltaic module (100) comprising: a first cell section (10) and a second cell section (20) arranged in a first direction (X), wherein the first cell section (10) and the second cell section (20) each have a front (11a) and a back (11b) facing opposite each other, and wherein an electrode is provided on the front (11a) and on the back (11b) of both the first cell section (10) and the second cell section (20); a busbar (30) arranged at least partially on the backs (11b) of the first cell section (10) and the second cell section (20); an insulating layer (40) arranged at least between the back (11b) of the first cell section (10) and the busbar (30); and a first solder strip (51) and a second solder strip (52);wherein the first solder strip (51) is arranged such that it bends from the front (11a) of the first cell piece (10) to the rear (11b) of the first cell piece (10) so that it is electrically connected between the electrode on the front (11a) of the first cell piece (10) and the busbar (30); and the second solder strip (52) is separately electrically connected to the electrode on the rear (11b) of the second cell piece (20) and the busbar (30). Photovoltaic module (100) according to claim 1, wherein the first solder strip (51) comprises a first connecting segment (511), a first curved segment (512) and a second connecting segment (513) which are sequentially connected; the first connecting segment (511) is arranged on a side of the front (11a) of the first cell piece (10) which is facing away from the rear (11b) of the first cell piece (10); the second connecting segment (513) is arranged on a side of the rear (11b) of the first cell piece (10) which is facing away from the front (11a) of the first cell piece (10), and the first curved segment (512) is arranged such that it bends in an arc shape. Photovoltaic module (100) according to claim 2, wherein a surface of the busbar (30) near the second cell piece (20) is connected to the electrode on the back side (11b) of the second cell piece (20) by the second solder strip (52). Photovoltaic module (100) according to claim 2 or 3, wherein the insulating layer (40) comprises a first insulating section (41) and a second insulating section (42); the first insulating section (41) is arranged between the rear side (11b) of the first cell piece (10) and the busbar (30); and the second insulating section (42) is arranged between the rear side (11b) of the second cell piece (20) and the busbar (30); and the second solder strip (52) is arranged such that it bends from one side of the second insulating section (42) near the second cell piece (20) to one side of the second insulating section (42) away from the second cell piece (20), so that it is electrically connected to each of the electrodes on the rear side (11b) of the second cell piece (20) and the busbar (30). Photovoltaic module (100) according to claim 4, wherein the second solder strip (52) comprises a third connecting segment (521), a second curved segment (522) and a fourth connecting segment (523) which are sequentially connected; the third connecting segment (521) is arranged between the rear side (11b) of the second cell piece (20) and the second insulating section (42); the fourth connecting segment (523) is arranged on the side of the second insulating section (42) facing away from the second cell piece (20); and the second curved segment (522) is arranged such that it bends in an arc shape; and the first curved segment (512) and the second curved segment (522) are arranged on the same side of the busbar (30) in a direction parallel to a plane in which the first cell piece (10) is placed. Photovoltaic module (100) according to claim 5, wherein the second connecting segment (513) and the fourth connecting segment (523) are arranged on the same side of the busbar (30) in a direction parallel to a thickness direction of the first cell piece (10). Photovoltaic module (100) according to claim 6, wherein the second connecting segment (513) is arranged on a side of the busbar (30) facing away from the first insulating section (41), and the fourth connecting segment (523) is arranged on a side of the busbar (30) facing away from the second insulating section (42); or the second connecting segment (513) is arranged between the busbar (30) and the first insulating section (41), and the fourth connecting segment (523) is arranged between the busbar (30) and the second insulating section (42). Photovoltaic module (100) according to claim 5, wherein the second connecting segment (513) and the fourth connecting segment (523) are arranged on different sides of the busbar (30) in a direction parallel to a thickness direction of the first cell piece (10). Photovoltaic module (100) according to claim 8, wherein the second connecting segment (513) is arranged on a side of the busbar (30) facing away from the first insulating section (41), and the fourth connecting segment (523) is arranged between the busbar (30) and the second insulating section (42); or the second connecting segment (513) is arranged between the busbar (30) and the first insulating section (41), and the fourth connecting segment (523) is arranged on a side of the busbar (30) facing away from the second insulating section (42). Photovoltaic module (100) according to one of claims 2 to 9, wherein the first connecting segment (511) and the second connecting segment (513) are spaced apart from each other in the first direction (X), wherein the distance between the first connecting segment (511) and the second connecting segment (513) in the first direction (X) is in the range of 0.5 millimeters to 3 millimeters; and / or the first curved segment (512) is spaced apart from a side edge of the first cell piece (10) in a second direction (Y) perpendicular to the first direction (X) and parallel to a plane in which the first cell piece (10) is placed, wherein a distance between the first curved segment (512) and the side edge of the first cell piece (10) in the second direction (Y) is in the range of 0.3 millimeters to 2 millimeters. Photovoltaic module (100) according to one of claims 5 to 8, wherein the third connecting segment (521) and the fourth connecting segment (523) are spaced apart from each other in the first direction (X), wherein the distance between the third connecting segment (521) and the fourth connecting segment (523) in the first direction (X) is in the range of 0.5 millimeters to 3 millimeters; and / or the second curved segment (522) is spaced apart from a side edge of the second cell piece (20) in a second direction (Y) perpendicular to the first direction (X) and parallel to a plane in which the second cell piece (20) is placed, wherein a distance between the second curved segment (522) and the side edge of the second cell piece (20) in the second direction (Y) is in the range of 0.3 millimeters to 2 millimeters. Photovoltaic module (100) according to one of claims 1 to 11, wherein the photovoltaic module (100) comprises several cell strings, each of the several cell strings comprises several cell pieces and the first cell piece (10) and the second cell piece (20) are each terminal cell pieces of two adjacent of the several cell strings. Photovoltaic module (100) according to one of claims 1 to 12, wherein several grooves (31) are provided on a surface of the busbar (30) in the vicinity of the first solder strip (51) or the second solder strip (52) and the first solder strip (51) or the second solder strip (52) is at least partially received in one of the several grooves (31); Optionally, the busbar (30) has a corrugated shape, wherein the several grooves (31) are defined by several troughs of the corrugated shape. Photovoltaic module (100) according to one of claims 1 to 13, wherein the insulating layer (40) comprises a first sub-insulating film (401), a second sub-insulating film (402) and a third sub-insulating film (403) which are stacked sequentially; and the first sub-insulating film (401) and the third sub-insulating film (403) are made of elastomeric materials; optionally, the second sub-insulating film (402) is made of a non-elastomeric material. Photovoltaic module (100) according to one of claims 1 to 14, wherein the total thickness of the photovoltaic module (100) at the first cell section (10) and the total thickness of the photovoltaic module (100) at the second cell section (20) are kept uniform.

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