Photovoltaic module

Abstract

The photovoltaic module comprises a first battery piece and a second battery piece which are arranged in the first direction, the first battery piece and the second battery piece are each provided with a front face and a back face which are arranged in a back-to-back mode, and the first battery piece and the second battery piece are each provided with a first welding strip located on the front face and a second welding strip located on the back face; and a bus bar; wherein the bus bar comprises a first part and a second part which are connected along a first direction, and the first part is positioned on one side, far away from the front surface, of the back surface of the first battery piece and is electrically connected with the second welding strip of the first battery piece; one part of the second part is positioned on one side of the back of the second battery piece far away from the front, and the other part of the second part is positioned on one side of the front of the second battery piece far away from the back and electrically connected with the first welding strip of the second battery piece. The area utilization rate and the module power of the photovoltaic module can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell manufacturing, and in particular to a photovoltaic module. Background Art

[0002] As an emerging energy source, solar energy has advantages over traditional fossil fuels in that it is inexhaustible, clean and environmentally friendly. At present, one of the main ways to utilize solar energy is to convert the received light energy into electrical energy output through solar cell modules, which can be a large-area battery module formed by several solar cells (or photovoltaic cells, or photovoltaic modules) connected in series, packaged and arranged in a square array. Among them, solar cells absorb light energy, and opposite charges accumulate at both ends of the battery, which generates "photovoltaic voltage", which is the "photovoltaic effect". Under the action of the photovoltaic effect, electromotive force is generated at both ends of the solar cell, thereby converting light energy into electrical energy. In photovoltaic modules, the role of welding ribbons and bus bars is to guide the current collected by the energy cell into the junction box. The bus bar plays an important role as the current lead in the solar module.

[0003] However, in the prior art, the bus bar is arranged between two adjacent battery cells, that is, the bus bar and the battery cell are placed on the same plane, and the bus bar occupies a part of the area of ​​the photovoltaic module, which reduces the effective area of ​​the photovoltaic module for receiving sunlight, thereby reducing the area utilization rate and module power of the photovoltaic module. Summary of the invention

[0004] Based on this, it is necessary to provide a photovoltaic module to solve the problem that the busbar and the battery cell are placed on the same plane, thereby reducing the area utilization rate and module power of the photovoltaic module.

[0005] The present application provides a photovoltaic module, comprising:

[0006] A first battery cell and a second battery cell arranged along a first direction, wherein the first battery cell and the second battery cell each have a front side and a back side disposed opposite to each other, and the first battery cell and the second battery cell each are provided with a first welding strip located on the front side and a second welding strip located on the back side; and

[0007] Busbars;

[0008] The bus bar includes a first portion and a second portion connected along the first direction, the first portion is located on a side of the back side of the first battery cell away from the front side, and is electrically connected to the second welding strip of the first battery cell;

[0009] A portion of the second part is located on the back side of the second battery cell away from the front side, and another portion of the second part is located on the front side of the second battery cell away from the back side and is electrically connected to the first welding strip of the second battery cell.

[0010] In some embodiments, the second portion includes a first segment, a curved segment, and a second segment connected in sequence, and the first segment is located on the back side of the second battery sheet away from the front side;

[0011] The second section is located on a side of the front side of the second battery cell away from the back side, and is electrically connected to the first welding strip of the second battery cell;

[0012] The curved section is curved in an arc shape from one end of the curved section close to the first section to one end of the curved section close to the second section.

[0013] In some embodiments, in a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second segment is smaller than the width of the first segment.

[0014] In some embodiments, in a direction perpendicular to the first direction and parallel to the plane where the second battery sheet is located, the width of the first portion and the first section are both 3 mm to 8 mm; and / or,

[0015] In a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second segment is 3 mm to 8 mm.

[0016] In some embodiments, the busbar further has a hollow hole, and the hollow hole is at least arranged in the bent section.

[0017] In some embodiments, the bus bar has a plurality of the hollow holes;

[0018] The curved section comprises a first connecting strip located between two adjacent hollow holes;

[0019] In a direction parallel to the first direction and parallel to the plane where the second battery cell is located, a width of the first connecting strip is 1 mm to 3 mm.

[0020] In some embodiments, the bus bar has a plurality of the hollow holes;

[0021] The hollow hole extends from the curved section to the first section;

[0022] The first section includes a main body connected to the first portion along the first direction, and a second connecting strip located between two adjacent hollow holes, wherein the second connecting strip is connected between the main body and the curved section.

[0023] In some embodiments, the bus bar has a plurality of the hollow holes;

[0024] The plurality of hollow holes are sequentially arranged along the first direction, and the hollow holes are arranged through the thickness direction of the bus bar and extend from the bent section to the second section;

[0025] The curved section and the second section include a third connecting strip located between two adjacent hollow holes, and the third connecting strip is electrically connected to the corresponding first welding strips on the front side of the second battery respectively.

[0026] In some embodiments, the photovoltaic assembly further comprises:

[0027] The first insulating film is disposed between the first segment and the second battery cell.

[0028] In some embodiments, the first insulating film includes a first sub-insulating film, a second sub-insulating film, and a third sub-insulating film that are stacked, and the first sub-insulating film and the third sub-insulating film are made of an elastomeric material.

[0029] In the embodiment of the present application, the first part is located on the back side of the first cell away from the front side, and is electrically connected to the second welding strip of the first cell; a part of the second part is located on the back side of the second cell away from the front side, and another part of the second part is located on the front side of the second cell away from the back side, and is electrically connected to the first welding strip of the second cell. In the first aspect, compared with the prior art in which the busbar and the cell are placed on the same plane, in the present application, the first part of the busbar does not need to occupy the area of ​​the photovoltaic module alone, and the area of ​​the photovoltaic module receiving sunlight is increased, thereby increasing the effective power generation area and improving the area utilization and module power of the photovoltaic module. In the second aspect, compared with the second part (or the first section) being located on the same plane as the cell, the present application can reduce the area of ​​the other part (the second section) of the second part located on the side of the front side of the second cell away from the back side, and increase the area of ​​the photovoltaic module receiving sunlight, thereby increasing the effective power generation area and improving the area utilization and module power of the photovoltaic module. Thirdly, the first part and the second part (or the first section) work together to increase the area of ​​the photovoltaic module that receives sunlight, thereby increasing the effective power generation area and improving the area utilization and module power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] FIG. 1 is a three-dimensional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0032] FIG. 2 is a schematic top view of a photovoltaic assembly provided in some embodiments of the present application.

[0033] FIG. 3 is a first schematic top view of a bus bar of a photovoltaic module provided in some embodiments of the present application.

[0034] FIG. 4 is a second schematic top view of a bus bar of a photovoltaic module provided in some embodiments of the present application.

[0035] FIG. 5 is a third schematic top view of a bus bar of a photovoltaic module provided in some embodiments of the present application.

[0036] FIG6 is a cross-sectional schematic diagram of a bus bar of a photovoltaic module provided in some embodiments of the present application.

[0037] FIG. 7 is a cross-sectional schematic diagram of a first insulating film of a photovoltaic module provided in some embodiments of the present application. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] Refer to Figures 1 to 6. Figure 1 is a three-dimensional schematic diagram of a photovoltaic module provided in some embodiments of the present application. Figure 2 is a top view schematic diagram of a photovoltaic module provided in some embodiments of the present application. Figure 3 is a first top view schematic diagram of a bus bar of a photovoltaic module provided in some embodiments of the present application. Figure 4 is a second top view schematic diagram of a bus bar of a photovoltaic module provided in some embodiments of the present application. Figure 5 is a third top view schematic diagram of a bus bar of a photovoltaic module provided in some embodiments of the present application. Figure 6 is a cross-sectional schematic diagram of a bus bar of a photovoltaic module provided in some embodiments of the present application. Figure 7 is a cross-sectional schematic diagram of a first insulating film of a photovoltaic module provided in some embodiments of the present application. Figure 6 is a cross-sectional schematic diagram in the direction of the dotted line CC in Figure 2. Figures 3 to 5 illustrate top view schematic diagrams of the bent section of the second part of the bus bar before or after bending.

[0045] The present application provides a photovoltaic module 100, which includes a first cell 10, a second cell 20, and a bus bar 30. The first cell 10 and the second cell 20 are arranged along a first direction X, and both the first cell 10 and the second cell 20 have a front side 11a and a back side 11b arranged opposite to each other, and both the first cell 10 and the second cell 20 are provided with a first welding strip 12a located on the front side 11a, and a second welding strip 12b located on the back side 11b; the bus bar 30 includes a first portion 31 and a second portion 32 connected along the first direction X, the first portion 31 is located on the side of the back side 11b of the first cell 10 away from the front side 11a, and is electrically connected to the second welding strip 12b of the first cell 10; a portion of the second portion 32 is located on the side of the back side 11b of the second cell 20 away from the front side 11a, and another portion of the second portion 32 is located on the side of the front side 11a of the second cell 20 away from the back side 11b, and is electrically connected to the first welding strip 12a of the second cell 20.

[0046] For example, in some embodiments, the composition of the photovoltaic module 100 includes a laminate and a frame, the laminate includes a cover plate, a first adhesive film, multiple groups of photovoltaic module strings, a second adhesive film and a back plate, the photovoltaic module string includes a plurality of battery cells (battery strings) arranged in series, the cover plate, the first adhesive film, multiple groups of photovoltaic module strings, the second adhesive film and the back plate are subjected to a lamination process to obtain a laminate, and the laminate and the frame are assembled to form the photovoltaic module 100, but the structure of the photovoltaic module 100 is not limited thereto.

[0047] For example, in some embodiments, the first film and the second film can be ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film or polyethylene terephthalate (PET) film, and can also be PVB film, EPE film (EVA and POE three-layer co-extruded film), EP film (EVA and POE two-layer co-extruded film), or other types of films, which can be selected according to actual needs and are not limited here.

[0048] For example, in some embodiments, the cover plate is disposed on the side of the first adhesive film away from the cell (the side of the front 11a away from the back 11b), and the cover plate can be made of transparent materials such as glass or polymer materials. When the cover plate is made of glass, it is also called "photovoltaic glass", which has good light transmittance and high hardness. After being covered on the first adhesive film, it can adapt to the large temperature difference between day and night and the bad weather environment, and play a protective role for the cell. The glass used for the cover plate can be ultra-white photovoltaic embossed glass, ultra-white processed float glass or TCO glass, etc., and can also be other types of front plate glass, which can be selected according to actual needs and is not limited here.

[0049] For example, in some embodiments, the backplane is disposed on the side of the second adhesive film away from the cell (the side of the back side 11b away from the front side 11a), and the backplane also protects and supports the cell, has good weather resistance, water resistance, corrosion resistance and insulation, etc., can not only isolate the photovoltaic module from the surrounding photovoltaic environment, but also effectively protect and support the cell, thereby increasing the impact strength of the photovoltaic module. The backplane can be made of glass (for example, rolled glass or ultra-white rolled glass), TPT (polyvinyl fluoride composite film) or TPE (thermoplastic elastomer), etc.

[0050] For example, the photovoltaic module 100 may include a plurality of battery strings, and the first battery cell 10 and the second battery cell 20 may be battery cells at the ends of two adjacent battery strings, but the invention is not limited thereto.

[0051] For example, the front side 11 a of the first solar cell 10 and the second solar cell 20 refers to the side of the first solar cell 10 and the second solar cell 20 that is exposed to sunlight, or the side that is mainly exposed to sunlight.

[0052] For example, the back side 11 b of the first solar cell 10 and the second solar cell 20 refers to the side facing away from sunlight.

[0053] For example, a first electrode may be provided on the front side 11a of the first battery cell 10 and the second battery cell 20, and a second electrode may be provided on the back side 11b of the first battery cell 10 and the second battery cell 20. The first electrode may be one of a positive grid and a negative grid, and the second electrode may be the other of the positive grid and the negative grid.

[0054] For example, the first battery cell 10 and the second battery cell 20 are both provided with a first welding strip 12a located on the front side 11a, and a second welding strip 12b located on the back side 11b. The first welding strip 12a can be connected to the first electrode on the front side 11a, and the second welding strip 12b can be connected to the second electrode on the back side 11b.

[0055] For example, the photovoltaic module 100 may include a plurality of battery strings, and the same battery string may include a plurality of battery cells connected in series. For example, the battery cells connected in series in the same battery string may be connected by welding ribbons, but is not limited thereto.

[0056] For example, the first portion 31 is located on the side of the back side 11b of the first battery cell 10 away from the front side 11a , and the first portion 31 may be directly contacted or directly welded to the second welding strip 12b of the back side 11b of the first battery cell 10 .

[0057] For example, compared to the prior art in which the busbar and the cell are placed on the same plane, in the present application, the busbar 30 includes a first part 31 and a second part 32 connected along a first direction X, and the first part 31 is located on the back side 11b of the first cell 10 away from the front side 11a, so that the first part 31 of the busbar 30 does not need to occupy the area of ​​the photovoltaic module 100 alone, thereby increasing the area of ​​the photovoltaic module 100 receiving sunlight, thereby increasing the effective power generation area, and improving the area utilization and module power of the photovoltaic module 100.

[0058] For example, a portion of the second part 32 electrically connected to the second welding strip 12b of the first battery cell 10 is located on the side of the back side 11b of the second battery cell 20 away from the front side 11a, and another portion of the second portion 32 is located on the side of the front side 11a of the second battery cell 20 away from the back side 11b, and is electrically connected to the first welding strip 12a of the second battery cell 20. At this time, the area of ​​the other portion of the second portion 32 located on the side of the front side 11a of the second battery cell 20 away from the back side 11b can be reduced. Compared with (the prior art) the second portion 32 (or the first section 321) is located in the same plane as the battery cell, the present application increases the area of ​​the photovoltaic module 100 that receives sunlight, thereby increasing the effective power generation area, and improving the area utilization and module power of the photovoltaic module 100.

[0059] In the embodiment of the present application, the first portion 31 is located on the side of the back side 11b of the first cell 10 away from the front side 11a, and is electrically connected to the second welding strip 12b of the first cell 10; a portion of the second portion 32 is located on the side of the back side 11b of the second cell 20 away from the front side 11a, and another portion of the second portion 32 is located on the side of the front side 11a of the second cell 20 away from the back side 11b, and is electrically connected to the first welding strip 12a of the second cell 20. In the first aspect, compared to the prior art in which the bus bar and the cell are placed on the same plane, in the present application, the first portion 31 of the bus bar 30 does not need to occupy the area of ​​the photovoltaic module 100 alone, which increases the area of ​​the photovoltaic module 100 that receives sunlight, thereby increasing the effective power generation area, and improving the area utilization rate and module power of the photovoltaic module 100. On the second hand, compared to the second part 32 (or the first section 321) being located in the same plane as the cell, the present application can reduce the area of ​​the other part (the second section 323) of the second part 32 located on the side of the front face 11a of the second cell 20 away from the back face 11b, thereby increasing the area of ​​the photovoltaic module 100 receiving sunlight, thereby increasing the effective power generation area, and improving the area utilization and module power of the photovoltaic module 100. On the third hand, the first part 31 and the second part 32 (or the first section 321) work together to increase the area of ​​the photovoltaic module 100 receiving sunlight, thereby increasing the effective power generation area, and improving the area utilization and module power of the photovoltaic module 100.

[0060] In some embodiments, the second portion 32 includes a first section 321, a bent section 322, and a second section 323 connected in sequence, the first section 321 is located on the back side 11b of the second battery cell 20 away from the front side 11a; the second section 323 is located on the front side 11a of the second battery cell 20 away from the back side 11b, and is electrically connected to the first welding strip 12a of the second battery cell 20; the bent section 322 is bent in an arc shape from one end of the bent section 322 close to the first section 321 to one end of the bent section 322 close to the second section 323.

[0061] For example, the curved section 322 is curved in an arc shape from one end of the curved section 322 close to the first section 321 to one end of the curved section 322 close to the second section 323 , so that the second section 323 of the second part 32 is connected to the first welding strip 12a of the front side 11a of the second battery cell 20 .

[0062] For example, as shown in FIG. 6 , the bending section 322 is bent in an arc shape from one end of the bending section 322 close to the first section 321 to one end of the bending section 322 close to the second section 323 , which can reduce the risk of the bending section 322 breaking.

[0063] In some embodiments, in a direction perpendicular to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the second segment 323 is smaller than the width of the first segment 321 .

[0064] For example, as shown in Figures 3 and 4, in some embodiments, the first segment 321 extends along the first direction X, the second segment 323 extends along the first direction X, the second direction Y is perpendicular to the first direction X, the width of the first segment 321 in the second direction Y is the first width d1, and the width of the second segment 323 in the second direction Y is the second width d2.

[0065] For example, as shown in FIG3 and FIG4, in the direction perpendicular to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the second section 323 is smaller than the width of the first section 321, that is, the second width d2 is smaller than the first width d1, and the second section 323 plays the role of the first welding strip 12a connecting the front side 11a of the second battery cell 20. The second section 323 can have a smaller width, thereby reducing the shielding area of ​​the second section 323 on the front side, increasing the area of ​​the front side 11a of the second battery cell 20 receiving sunlight, thereby increasing the effective power generation area and improving the conversion efficiency of the photovoltaic module. The first width d1 is larger, which can reduce the resistance of the busbar 30 transmitting current along the first direction X.

[0066] In some embodiments, in a direction perpendicular to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the first portion 31 and the first segment 321 are both 3 mm to 8 mm.

[0067] For example, as shown in FIG. 4 , the widths of the first portion 31 and the first section 321 may be equal, for example, the widths of the first portion 31 and the first section 321 are both the first width d1 , and the first width d1 is 3 mm to 8 mm.

[0068] For example, as shown in FIG. 3 , the widths of the first portion 31 and the first segment 321 may be unequal, for example, the width of the first segment 321 is greater than the width of the first portion 31 , so as to reduce the impedance of the busbar 30 transmitting current along the first direction X.

[0069] For example, as shown in Figures 3 and 4, the width of the first part 31 and the first segment 321 can be any value among 3 mm, 4 mm, 5 mm, 6 mm, 7 mm and 8 mm to reduce the impedance of the first part 31 and the first segment 321 transmitting current along the first direction X.

[0070] In some embodiments, in a direction perpendicular to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the second segment 323 is 3 mm to 8 mm.

[0071] For example, as shown in FIG. 3 , in a direction perpendicular to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the second segment 323 is 3 mm to 8 mm, that is, the second width d2 is 3 mm to 8 mm.

[0072] For example, the second width d2 may be any value among 3 mm, 4 mm, 5 mm, 6 mm, 7 mm and 8 mm to ensure that the second section 323 is firmly connected to the first welding strip 12 a of the front side 11 a of the second battery cell 20 .

[0073] In some embodiments, the bus bar 30 further has a hollow hole 324 , and the hollow hole 324 is at least disposed in the bent section 322 .

[0074] For example, as shown in FIG3 , the busbar 30 also has a hollow hole 324 , which is at least arranged in the bending section 322 , so as to reduce the bending stress of the bending portion and release a certain bending stress at the hollow hole 324 , thereby reducing the risk of damage such as bending or breakage of the bending section 322 after bending, and also reducing the risk of cracks at the edge of the battery cell here.

[0075] In some embodiments, the bus bar 30 has a plurality of hollow holes 324; the curved section 322 includes a first connecting bar 32t1 located between two adjacent hollow holes 324; and the width of the first connecting bar 32t1 is 1 mm to 3 mm in a direction parallel to the first direction X and parallel to the plane where the second battery cell 20 is located.

[0076] For example, as shown in Figures 3 and 4, in a direction parallel to the first direction X and parallel to the plane where the second battery cell 20 is located, the width of the first connecting bar 32t1 is 1 mm to 3 mm, that is, the width of the first connecting bar 32t1 is the third width d3, and the third width d3 is 1 mm to 3 mm.

[0077] For example, the third width d3 can be any value among 1 mm, 1.5 mm, 2 mm, 2.5 mm and 3 mm. A smaller third width d3 is easier to bend or fold, and the risk of damage such as breakage of the bending section 322 after bending or folding can be reduced.

[0078] In some embodiments, as shown in FIG. 4 , the busbar 30 has a plurality of hollow holes 324 ; the hollow holes 324 extend from the curved section 322 to the first section 321 ; the first section 321 includes a main body 32z connected to the first portion 31 along a first direction X, and a second connecting bar 32t2 located between two adjacent hollow holes 324 , and the second connecting bar 32t2 is connected between the main body 32z and the curved section 322 .

[0079] For example, as shown in Figure 4, the main body 32z of the first section 321 extends along the first direction X, and the main body 32z is connected to the first part 31, the hollow hole 324 extends from the curved section 322 to the first section 321, the second connecting strip 32t2 is located between two adjacent hollow holes 324, and the second connecting strip 32t2 is connected between the main body 32z and the curved section 322.

[0080] For example, as shown in Figure 4, the hollow hole 324 extends from the curved section 322 to the first section 321, so that the width of the first section 321 in the direction perpendicular to the first direction X is reduced, thereby reducing the facing area of ​​the first section 321 and the second welding strip 12b on the back side 11b of the second battery cell 20, thereby reducing the short circuit risk between the first section 321 and the second welding strip 12b on the back side 11b of the second battery cell 20.

[0081] In some embodiments, as shown in FIG. 5 , the busbar 30 has a plurality of hollow holes 324; the plurality of hollow holes 324 are arranged in sequence along the first direction X, and the hollow holes 324 are arranged through the thickness direction of the busbar 30, and extend from the curved section 322 to the second section 323; the curved section 322 and the second section 323 include a third connecting bar 32t3 located between two adjacent hollow holes 324, and the third connecting bar 32t3 is electrically connected to the corresponding first welding strip 12a of the second battery front side 11a, respectively.

[0082] For example, the hollow hole 324 is arranged along the thickness direction of the bus bar 30, and extends from the bent section 322 to the second section 323, so that the second section 323 is composed of a plurality of third connecting strips 32t3, and the third connecting strips 32t3 are respectively electrically connected to the corresponding first welding strips 12a of the front side 11a of the second battery cell 20, which can better reduce the area of ​​the second section 323, so that the second part 32 of the bus bar 30 blocks a smaller area of ​​the second battery cell 20 on the front side, and better increases the area of ​​the front side 11a of the second battery cell 20 that receives sunlight, thereby better increasing the effective power generation area and better improving the conversion efficiency of the photovoltaic module.

[0083] In some embodiments, as shown in FIG. 1 , FIG. 2 , and FIG. 6 , the photovoltaic module 100 further includes a first insulating film 40 , and the first insulating film 40 is disposed between the first segment 321 and the second solar cell 20 .

[0084] For example, the first insulating film 40 is disposed between the first section 321 and the second battery cell 20 , so as to avoid a short circuit between the first section 321 and the second soldering ribbon 12 b on the back side 11 b of the second battery cell 20 .

[0085] In some embodiments, as shown in FIG. 7 , the first insulating film 40 includes a first sub-insulating film 41 , a second sub-insulating film 42 , and a third sub-insulating film 43 that are stacked, and the first sub-insulating film 41 and the third sub-insulating film 43 are made of an elastomeric material.

[0086] Illustratively, the second sub-insulating film 42 is interposed between the first sub-insulating film 41 and the third sub-insulating film 43 .

[0087] For example, the second sub-insulating film 42 may be made of a non-elastic material to play the role of insulation and support.

[0088] For example, the first sub-insulating film 41 and the third sub-insulating film 43 are made of elastomeric materials, so that they can play a buffering role. For example, when the bus bar 30 is subjected to external impact force, the first sub-insulating film 41 and the third sub-insulating film 43 can buffer the external stress and avoid damage to the battery cell.

[0089] For example, a glue layer may be provided between the first insulating film 40 and the bus bar to bond the first insulating film 40 and the bus bar, thereby enhancing fixation and preventing the first insulating film 40 or the bus bar from moving.

[0090] In some embodiments, a plurality of first grooves are provided on a side of the first portion 31 close to the adjacent second welding strip 12 b , and at least a portion of the second welding strip 12 b is accommodated in the corresponding first grooves.

[0091] For example, the first portion 31 may be directly connected to the second welding ribbon 12 b of the back side 11 b of the first battery cell 10 .

[0092] For example, a plurality of first grooves are provided on a surface of one side of the first portion 31 close to the adjacent second welding strip 12b, and at least a portion of the second welding strip 12b is accommodated in the corresponding first groove, so that the bus bar 30 has the function of fixing the second welding strip 12b, or the second welding strip 12b has the function of fixing the bus bar 30, thereby avoiding the movement of the welding strip or the bus bar.

[0093] In some embodiments, a plurality of second grooves are disposed on a side of the second portion 32 close to the adjacent first welding strip 12 a , and at least a portion of the first welding strip 12 a is accommodated in the corresponding second grooves.

[0094] For example, the second portion 32 is provided with a plurality of second grooves on a side of the first welding strip 12a adjacent to the second battery cell 20, and the second section 323 is provided with a plurality of second grooves on a surface of a side adjacent to the first welding strip 12a, and at least a portion of the first welding strip 12a is accommodated in the corresponding second grooves, so that the bus bar 30 has the function of fixing the first welding strip 12a, or the first welding strip 12a has the function of fixing the bus bar 30, thereby avoiding the movement of the welding strip or the bus bar.

[0095] For example, in some embodiments, at least a portion of the busbar 30 is in a wavy shape, the thickness of each portion of the wave is the same, and the first groove and / or the second groove may be a trough of the wave.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic module, characterized in that: include: A first battery cell and a second battery cell arranged along a first direction, wherein the first battery cell and the second battery cell each have a front side and a back side disposed opposite to each other, and the first battery cell and the second battery cell each are provided with a first welding strip located on the front side and a second welding strip located on the back side; and Busbars; The bus bar includes a first portion and a second portion connected along the first direction, the first portion is located on a side of the back side of the first battery cell away from the front side, and is electrically connected to the second welding strip of the first battery cell; A portion of the second part is located on the back side of the second battery cell away from the front side, and another portion of the second part is located on the front side of the second battery cell away from the back side and is electrically connected to the first welding strip of the second battery cell.

2. The photovoltaic module according to claim 1, characterized in that: The second portion includes a first section, a bent section, and a second section connected in sequence, wherein the first section is located on the back side of the second battery sheet away from the front side; The second section is located on a side of the front side of the second battery cell away from the back side, and is electrically connected to the first welding strip of the second battery cell; The curved section is curved in an arc shape from one end of the curved section close to the first section to one end of the curved section close to the second section.

3. The photovoltaic module according to claim 2, characterized in that: In a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second section is smaller than the width of the first section.

4. The photovoltaic module according to claim 2, characterized in that: In a direction perpendicular to the first direction and parallel to the plane where the second battery sheet is located, the width of the first portion and the first section are both 3 mm to 8 mm; and / or, In a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second segment is 3 mm to 8 mm.

5. The photovoltaic module according to claim 2, characterized in that: The bus bar further has a hollow hole, and the hollow hole is at least arranged in the bending section.

6. The photovoltaic module according to claim 5, characterized in that: The bus bar has a plurality of hollow holes; The curved section comprises a first connecting strip located between two adjacent hollow holes; In a direction parallel to the first direction and parallel to the plane where the second battery cell is located, a width of the first connecting strip is 1 mm to 3 mm.

7. The photovoltaic module according to claim 5, characterized in that: The bus bar has a plurality of hollow holes; The hollow hole extends from the curved section to the first section; The first section includes a main body connected to the first portion along the first direction, and a second connecting strip located between two adjacent hollow holes, wherein the second connecting strip is connected between the main body and the curved section.

8. The photovoltaic module according to claim 5, characterized in that: The bus bar has a plurality of hollow holes; The plurality of hollow holes are sequentially arranged along the first direction, and the hollow holes are arranged through the thickness direction of the bus bar and extend from the bent section to the second section; The curved section and the second section include a third connecting strip located between two adjacent hollow holes, and the third connecting strip is electrically connected to the corresponding first welding strips on the front side of the second battery respectively.

9. The photovoltaic module according to claim 2, characterized in that: The photovoltaic module further comprises: The first insulating film is disposed between the first segment and the second battery cell.

10. The photovoltaic module according to claim 9, characterized in that: The first insulating film includes a first sub-insulating film, a second sub-insulating film, and a third sub-insulating film which are stacked, and the first sub-insulating film and the third sub-insulating film are made of an elastic material.

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