Photovoltaic panels

Abstract

The present application relates to a photovoltaic module, which includes: a first cell and a second cell arranged along a first direction, the first cell and the second cell both having a front side and a back side arranged opposite to each other, and the first cell and the second cell both having electrodes located on the front side and the back side; a bus bar, at least partially arranged on the back side of the battery string; an insulating layer, at least arranged between the back side of the first cell and the bus bar; a first welding strip and a second welding strip; wherein the first welding strip is bent from the front side of the first cell to the back side of the first cell to electrically connect between the electrode on the front side of the first cell and the bus bar; and the second welding strip is electrically connected to the electrode on the back side of the second cell and the bus bar respectively. The present application can solve the problems of low area utilization and low module power of photovoltaic modules.

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 both have a front side and a back side disposed opposite to each other, and the first battery cell and the second battery cell both have electrodes located on the front side and the back side;

[0007] A bus bar, at least partially disposed on the back side of the battery string;

[0008] An insulating layer, at least disposed between the back surface of the first battery cell and the bus bar;

[0009] a first welding strip and a second welding strip;

[0010] The first welding strip is bent from the front side of the first battery cell to the back side of the first battery cell to electrically connect the electrode on the front side of the first battery cell and the bus bar;

[0011] The second welding ribbon is electrically connected to the electrode on the back side of the second battery cell and the bus bar respectively.

[0012] In some embodiments, the first welding strip includes a first connecting segment, a first bending segment, and a second connecting segment connected in sequence, the first connecting segment is arranged on the side of the front side of the first battery cell facing away from the back side, the second connecting segment is arranged on the side of the back side of the second battery cell facing away from the front side, and the first bending segment is bent in an arc shape.

[0013] In some embodiments, a surface of the bus bar close to the second battery cell is directly connected to an electrode on a back side of the second battery cell through the second welding ribbon.

[0014] In some embodiments, the insulating layer includes a first insulating portion and a second insulating portion, the first insulating portion is disposed between the back side of the first battery cell and the bus bar, and the second insulating portion is disposed between the back side of the second battery cell and the bus bar;

[0015] The second welding strip is bent from a side of the second insulating portion close to the second battery cell to a side of the second insulating portion away from the second battery cell to be electrically connected to the electrode on the back side of the second battery cell and the bus bar respectively.

[0016] In some embodiments, the second welding strip includes a third connecting section, a second bending section, and a fourth connecting section connected in sequence, the third connecting section is arranged between the back surface of the second battery cell and the second insulating portion, the fourth connecting section is arranged on a side of the second insulating portion away from the second battery cell, and the second bending section is arranged to be bent in an arc shape;

[0017] In a direction parallel to the plane where the first battery cell is located, the first curved section and the second curved section are both located on the same side of the bus bar.

[0018] In some embodiments, along a thickness direction parallel to the first battery cell, the second connecting segment and the fourth connecting segment are disposed on a same side of the bus bar.

[0019] In some embodiments, the second connecting section is disposed on a side of the bus bar away from the first insulating portion, and the fourth connecting section is disposed on a side of the bus bar away from the second insulating portion; or,

[0020] The second connecting section is disposed between the bus bar and the first insulating portion, and the fourth connecting section is disposed between the bus bar and the second insulating portion.

[0021] In some embodiments, along a thickness direction parallel to the first battery cell, the second connecting segment and the fourth connecting segment are disposed on different sides of the bus bar.

[0022] In some embodiments, the second connecting section is disposed on a side of the bus bar away from the first insulating portion, and the fourth connecting section is disposed between the bus bar and the second insulating portion; or,

[0023] The second connecting section is disposed between the bus bar and the first insulating portion, and the fourth connecting section is disposed on a side of the bus bar away from the second insulating portion.

[0024] In some embodiments, the first connecting segment and the second connecting segment are spaced apart in the first direction, and the spacing between the first connecting segment and the second connecting segment in the first direction is 0.5 mm to 3 mm; and / or,

[0025] The first curved section is spaced apart from a side edge of the first battery cell along the first direction, and a distance between the first curved section and a side edge of the first battery cell along the first direction is 0.3 to 2 mm.

[0026] In the embodiment of the present application, the bus bar is at least partially disposed on the back of the battery string, and the first welding strip is bent from the front of the first battery cell to the back of the first battery cell to electrically connect the electrode on the front of the first battery cell and the bus bar. Compared with the prior art in which the bus bar and the battery cell are placed on the same plane, in the present application, the bus bar is at least partially disposed on the back of the battery string, which reduces the area of ​​the photovoltaic module occupied by the bus bar and increases the area of ​​the photovoltaic module exposed to sunlight, thereby increasing the effective power generation area and improving the area utilization rate and module power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A first stereoscopic schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0029] Figure 2 A first side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0030] Figure 3A second stereoscopic schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0031] Figure 4 A second side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0032] Figure 5 A third side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0033] Figure 6 A fourth side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0034] Figure 7 A fifth side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0035] Figure 8 A schematic top view of a photovoltaic assembly provided in some embodiments of the present application.

[0036] Fig. 9 A first cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0037] Fig.10 A second cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0038] Fig.11 A third cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0039] Fig.12 A schematic cross-sectional view of an insulating layer of a photovoltaic module provided in some embodiments of the present application. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] See also Figures 1 to 8 . Figure 1 A first stereoscopic schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 2 A first side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 2 for Figure 1 Schematic side view of the photovoltaic module.

[0047] Figure 3 A second stereoscopic schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 4 A second side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 4 for Figure 3 Schematic side view of the photovoltaic module.

[0048] Figure 5 A third side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 6 A fourth side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figure 7 A fifth side view schematic diagram of a photovoltaic assembly provided in some embodiments of the present application.

[0049] Figure 8 A schematic top view of a photovoltaic assembly provided in some embodiments of the present application. Figure 8 for Figure 3 Schematic top view of .

[0050] Fig. 9 A first cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Fig.10 A second cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Fig.11 A third cross-sectional schematic diagram of a photovoltaic assembly provided in some embodiments of the present application. Figures 9 to 11 for Figure 8 The cross-sectional structure of the middle bus bar portion along the first direction X.

[0051] Fig.12 A schematic cross-sectional view of an insulating layer of a photovoltaic module provided in some embodiments of the present application.

[0052] The present application provides a photovoltaic module 100, which includes a first battery cell 10 and a second battery cell 20, a bus bar 30, an insulating layer 40, a first welding strip 51 and a second welding strip 52. The first battery cell 10 and the second battery cell 20 are arranged along a first direction X, and the first battery cell 10 and the second battery cell 20 both have a front side 11a and a back side 11b disposed opposite to each other, and electrodes are disposed on the front side 11a and the back side 11b on the first battery cell 10 and the second battery cell 20; the bus bar 30 is at least partially disposed on the back side 11b of the battery string; the insulating layer 40 is at least disposed between the back side 11b of the first battery cell 10 and the bus bar 30; wherein the first welding strip 51 is bent from the front side 11a of the first battery cell 10 to the back side 11b of the first battery cell 10 to electrically connect between the electrode on the front side 11a of the first battery cell 10 and the bus bar 30; the second welding strip 52 is electrically connected to the electrode on the back side 11b of the second battery cell 20 and the bus bar 30 respectively.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] For example, a first electrode 12a may be provided on the front side 11a of the first battery cell 10 and the second battery cell 20, and a second electrode 12b may be provided on the back side 11b of the first battery cell 10 and the second battery cell 20. The first electrode 12a may be one of a positive grid and a negative grid, and the second electrode 12b may be the other of the positive grid and the negative grid.

[0061] By way of example, in some embodiments, the first welding ribbon 51 may be directly electrically connected to the first electrode 12a of the front side 11a of the first battery cell 10. By way of example, in some embodiments, the first welding ribbon 51 may also be electrically connected to the first electrode 12a of the front side 11a of the first battery cell 10 through a first sub-welding ribbon. By way of example, in some embodiments, the first welding ribbon 51 and the first sub-welding ribbon may be different welding ribbons. By way of example, in some embodiments, the first welding ribbon 51 and the first sub-welding ribbon may be an integrated structure or the same welding ribbon.

[0062] 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.

[0063] For example, the busbar 30 is at least partially disposed on the back side 11b of the battery string, and in the thickness direction of the battery cell, the busbar 30 and the battery cell are at least partially overlapped. In some embodiments, the busbar 30 is entirely disposed on the back side 11b of the battery string.

[0064] 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 is at least partially arranged on the back side 11b of the cell string, which reduces the area of ​​the photovoltaic module occupied by the busbar 30 and increases 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.

[0065] For example, the insulating layer 40 is disposed at least between the back surface 11 b of the first cell 10 and the bus bar 30 , so as to prevent the bus bar 30 from being short-circuited with the second electrode 12 b of the back surface 11 b of the first cell 10 .

[0066] For example, the first welding strip 51 is bent from the front side 11a of the first battery cell 10 to the back side 11b of the first battery cell 10 so that the bus bar 30 on the back side 11b of the first battery cell 10 is electrically connected to the first electrode 12a on the front side 11a of the first battery cell 10.

[0067] For example, Figure 1 It is illustrated that the first direction X is perpendicular to the second direction Y, and the plane where the first direction X and the second direction Y are located is parallel to the plane where the first battery cell 10 is located.

[0068] In the embodiment of the present application, the bus bar 30 is at least partially disposed on the back side 11b of the battery string, and the first welding strip 51 is bent from the front side 11a of the first battery cell 10 to the back side 11b of the first battery cell 10 to electrically connect the electrode on the front side 11a of the first battery cell 10 and the bus bar 30. Compared with the prior art in which the bus bar 30 and the battery cell are placed on the same plane, in the present application, the bus bar 30 is at least partially disposed on the back side 11b of the battery string, which reduces the area of ​​the photovoltaic module occupied by the bus bar 30 and increases the area of ​​the photovoltaic module 100 receiving sunlight, thereby increasing the effective power generation area and improving the area utilization rate and module power of the photovoltaic module 100.

[0069] In some embodiments, the first welding strip 51 includes a first connecting segment 511, a first bending segment 512, and a second connecting segment 513 connected in sequence, the first connecting segment 511 is arranged on the side of the front side 11a of the first battery cell 10 away from the back side 11b, the second connecting segment 513 is arranged on the side of the back side 11b of the second battery cell 20 away from the front side 11a, and the first bending segment 512 is bent in an arc shape.

[0070] For example, the first curved section 512 is curved in an arc shape, which not only makes the first connecting section 511 electrically connected to the first electrode 12a on the front side 11a of the first battery cell 10, and the second connecting section 513 electrically connected to the bus bar 30 on the back side 11b of the first battery cell 10, but also makes the first curved section 512 less prone to damage risks such as breakage.

[0071] In some embodiments, Figure 1 and Figure 2 As shown, the surface of the bus bar 30 close to the second battery cell 20 is directly connected to the electrode on the back side 11 b of the second battery cell 20 through the second welding ribbon 52 .

[0072] For example, Figure 1 and Figure 2 As shown, the surface of the bus bar 30 close to the second battery cell 20 is directly connected to the electrode on the back side 11b of the second battery cell 20 through the second welding strip 52, that is, the surface of the bus bar 30 close to the second battery cell 20 is directly contacted and connected with the second electrode 12b or the second welding strip 52, which has the effect of simple manufacturing process.

[0073] It should be noted that Figure 2 , it is illustrated that the second connection section 513 is connected to the busbar 30 between the insulating layer 40 and the busbar 30 . The second connection section 513 may also be connected to the busbar 30 on a side of the busbar 30 away from the insulating layer 40 .

[0074] In some embodiments, Figures 3 to 7 As shown, the insulating layer 40 includes a first insulating portion 41 and a second insulating portion 42. The first insulating portion 41 is arranged between the back side 11b of the first battery cell 10 and the bus bar 30, and the second insulating portion 42 is arranged between the back side 11b of the second battery cell 20 and the bus bar 30; the second welding strip 52 is bent from the side of the second insulating portion 42 close to the second battery cell 20 to the side of the second insulating portion 42 away from the second battery cell 20, so as to be electrically connected to the electrode on the back side 11b of the second battery cell 20 and the bus bar 30 respectively.

[0075] For example, with Figure 1-2 The difference in the embodiment is that in Figures 3 to 7 In the embodiment, the second welding strip 52 is also bent, and the second welding strip 52 is bent from the side of the second insulating portion 42 close to the second battery cell 20 to the side of the second insulating portion 42 away from the second battery cell 20, which can ensure that in the photovoltaic module 100, in the direction perpendicular to the thickness of the battery cell, the total thickness at the first battery cell 10 and the total thickness at the second battery cell 20 can be kept consistent, so that the bus bar 30 is in more firm contact with the first welding strip 51 and the second welding strip 52, so that the photovoltaic module 100 can maintain uniform force when subjected to external force, thereby reducing the risk of damage such as breakage.

[0076] For example, the insulating layer 40 includes a first insulating part 41 and a second insulating part 42. The first insulating part 41 is arranged between the back side 11b of the first battery cell 10 and the bus bar 30. The first insulating part 41 and the second insulating part 42 can be insulating film layers that are independent of each other or are arranged at intervals. The first insulating part 41 and the second insulating part 42 can also be an integrally molded structure or an integral structure.

[0077] For example, the first insulating part 41 and the second insulating part 42 have the same thickness, which can better ensure that the total thickness at the first battery cell 10 and the total thickness at the second battery cell 20 remain consistent, so that the photovoltaic module 100 can maintain uniform force when subjected to external force, reducing the risk of damage such as breakage.

[0078] In some embodiments, Figures 3 to 7 As shown, the second welding strip 52 includes a third connecting segment 521, a second bending segment 522 and a fourth connecting segment 523 which are connected in sequence. The third connecting segment 521 is arranged between the back side 11b of the second battery cell 20 and the second insulating portion 42, the fourth connecting segment 523 is arranged on the side of the second insulating portion 42 away from the second battery cell 20, and the second bending segment 522 is bent in an arc shape; in a direction parallel to the plane where the first battery cell 10 is located, the first bending segment 512 and the second bending segment 522 are both located on the same side of the bus bar 30.

[0079] For example, the third connecting section 521 is disposed between the back side 11b of the second battery cell 20 and the second insulating portion 42, and the third connecting section 521 can be directly electrically connected to the second electrode 12b of the back side 11b of the second battery cell 20. For example, in some embodiments, the third connecting section 521 can also be electrically connected to the second electrode 12b of the back side 11b of the second battery cell 20 through the second sub-welding strip. For example, in some embodiments, the second welding strip 52 and the second sub-welding strip can be different welding strips. For example, in some embodiments, the second welding strip 52 and the second sub-welding strip can be an integrated structure or the same welding strip.

[0080] For example, the fourth connection segment 523 is disposed on a side of the second insulating portion 42 away from the second battery cell 20 , and the fourth connection segment 523 is connected to the bus bar 30 .

[0081] For example, in a direction parallel to the plane where the first battery cell 10 is located, the first bent segment 512 and the second bent segment 522 are both located on the same side of the bus bar 30, that is, the orthographic projection of the first bent segment 512 on the plane where the first battery cell 10 is located, and the orthographic projection of the second bent segment 522 on the plane where the first battery cell 10 is located are both located on the same side of the orthographic projection of the bus bar 30 on the plane where the first battery cell 10 is located, which can reduce the difficulty of the manufacturing process. For example, the first welding strip 51 and the second welding strip 52 can be bent in the same direction in the same bending process.

[0082] In some embodiments, Figure 3 , Figure 4 and Figure 5 As shown, along the thickness direction parallel to the first battery cell 10 , the second connecting segment 513 and the fourth connecting segment 523 are arranged on the same side of the bus bar 30 .

[0083] For example, along the thickness direction parallel to the first battery cell 10, the second connecting segment 513 and the fourth connecting segment 523 are arranged on the same side of the bus bar 30. The second connecting segment 513 and the fourth connecting segment 523 are connected or welded to the bus bar 30 on the same side of the bus bar 30. There is no need to connect or weld on both sides of the bus bar, which can make the manufacturing process simpler.

[0084] In some embodiments, Figure 3 , Figure 4 As shown, the second connection segment 513 is disposed on a side of the bus bar 30 away from the first insulating portion 41 , and the fourth connection segment 523 is disposed on a side of the bus bar 30 away from the second insulating portion 42 .

[0085] For example, Figure 3 , Figure 4 As shown, the second connecting segment 513 and the fourth connecting segment 523 are both connected to the bus bar 30 at a side of the bus bar 30 away from the insulating layer 40 .

[0086] In some embodiments, Figure 5 As shown, the second connection segment 513 is disposed between the bus bar 30 and the first insulating portion 41 , and the fourth connection segment 523 is disposed between the bus bar 30 and the second insulating portion 42 .

[0087] For example, Figure 5 As shown, the second connecting segment 513 and the fourth connecting segment 523 are both connected to the bus bar 30 between the bus bar 30 and the insulating layer 40 .

[0088] In some embodiments, Figure 6 and Figure 7 Please refer to Figure 3 , along a thickness direction parallel to the first battery cell 10 , the second connecting segment 513 and the fourth connecting segment 523 are arranged on different sides of the bus bar 30 .

[0089] For example, along the thickness direction parallel to the first battery cell 10, the second connecting segment 513 and the fourth connecting segment 523 are arranged on different sides of the bus bar 30, and the second connecting segment 513 and the fourth connecting segment 523 are respectively connected or welded to the bus bar 30 on both sides of the bus bar 30. The first welding strip 51 and the second welding strip 52 can fix the bus bar 30 on both sides of the bus bar 30, and the bus bar 30 is not easy to fall off, thereby improving the reliability and mechanical properties of the photovoltaic module 100.

[0090] In some embodiments, Figure 6 As shown, the second connection segment 513 is disposed on a side of the bus bar 30 away from the first insulating portion 41 , and the fourth connection segment 523 is disposed between the bus bar 30 and the second insulating portion 42 .

[0091] For example, Figure 6 As shown, the second connecting section 513 is connected to the busbar 30 at a side of the busbar 30 facing away from the first insulating portion 41 , and the fourth connecting section 523 is connected to the busbar 30 between the busbar 30 and the second insulating portion 42 .

[0092] In some embodiments, Figure 7 As shown, the second connection segment 513 is disposed between the bus bar 30 and the first insulating portion 41 , and the fourth connection segment 523 is disposed on a side of the bus bar 30 away from the second insulating portion 42 .

[0093] For example, Figure 7 As shown, the second connecting section 513 is connected to the busbar 30 between the busbar 30 and the first insulating portion 41 , and the fourth connecting section 523 is connected to the busbar 30 at a side of the busbar 30 facing away from the second insulating portion 42 .

[0094] In some embodiments, Figure 8 Please combine Figure 3 The first connecting segment 511 and the second connecting segment 513 are spaced apart in the first direction X, and the spacing between the first connecting segment 511 and the second connecting segment 513 in the first direction X is 0.5 mm to 3 mm.

[0095] For example, Figure 8 As shown, the first connecting segment 511 and the second connecting segment 513 are spaced apart in the first direction X, that is, the orthographic projection of the first connecting segment 511 on the plane where the first battery cell 10 is located is spaced apart from the orthographic projection of the second connecting segment 513 on the plane where the first battery cell 10 is located, so that the first curved segment 512 has a certain length in the first direction X, which can reduce the thickness of the photovoltaic module 100 at this location, reduce the risk of breakage of the first curved segment 512, and reduce the risk of hidden cracks in the battery cell.

[0096] For example, Figure 8As shown, the distance between the first connecting segment 511 and the second connecting segment 513 in the first direction X is 0.5 mm to 3 mm, that is, the distance between the orthographic projection of the first connecting segment 511 on the plane where the first battery cell 10 is located and the orthographic projection of the second connecting segment 513 on the plane where the first battery cell 10 is located is 0.5 mm to 3 mm. Figure 8 The first distance d1.

[0097] For example, the first distance d1 may be any value among 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm and 3 mm.

[0098] For example, in some embodiments, the third connecting segment 521 and the fourth connecting segment 523 are spaced apart in the first direction X, and the spacing between the third connecting segment 521 and the fourth connecting segment 523 in the first direction X is 0.5 mm to 3 mm.

[0099] In some embodiments, Figure 8 As shown, the first curved section 512 is spaced apart from a side edge of the first battery cell 10 along the first direction X, and the distance between the first curved section 512 and a side edge of the first battery cell 10 along the first direction X is 0.3 to 2 mm.

[0100] For example, Figure 8 As shown, the first curved section 512 is spaced apart from a side edge of the first battery cell 10 along the first direction X, and the spacing between the first curved section 512 and a side edge of the first battery cell 10 along the first direction X is 0.3 to 2 mm, that is, the orthographic projection of the first curved section 512 on the plane where the first battery cell 10 is located is spaced apart from the side edge of the first battery cell 10, and the spacing between the orthographic projection of the first curved section 512 on the plane where the first battery cell 10 is located and the side edge of the first battery cell 10 is 0.3 to 2 mm, as shown in FIG. Figure 8 The second distance d2 can avoid short circuit between the first welding strip 51 and the unnecessary connected structure on the first battery cell 10. When subjected to external force, the first curved section 512 has a buffering space, which can reduce the risk of the first battery cell 10 being broken.

[0101] For example, Figure 8 As shown, in some embodiments, the second curved segment 522 is spaced apart from one side edge of the second battery cell 20 along the first direction X, and the spacing between the second curved segment 522 and one side edge of the second battery cell 20 along the first direction X is 0.3 to 2 mm, that is, the orthographic projection of the second curved segment 522 on the plane where the second battery cell 20 is located is spaced apart from the side edge of the second battery cell 20, and the spacing between the orthographic projection of the second curved segment 522 on the plane where the second battery cell 20 is located and the side edge of the second battery cell 20 is 0.3 to 2 mm, as shown in FIG. Figure 8The second distance d2 can avoid short circuit between the second welding strip 52 and unnecessary connected structures on the second battery cell 20. When subjected to external force, the second curved section 522 has a buffering space, which can reduce the risk of the second battery cell 20 being broken.

[0102] For example, the second distance d2 may be any value of 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 2 mm.

[0103] For example, in some embodiments, Figures 9 to 11 A plurality of grooves 31 are provided on the surface of one side of the bus bar 30 close to the adjacent first welding strip 51 and / or the second welding strip 52, and at least part of the first welding strip 51 and / or the second welding strip 52 is accommodated in the corresponding grooves 31, so that the bus bar 30 has the function of fixing the first welding strip 51 and / or the second welding strip 52, or the first welding strip 51 and / or the second welding strip 52 has the function of fixing the bus bar 30, thereby improving the reliability and mechanical properties of the photovoltaic module 100.

[0104] For example, in some embodiments, Fig.11 As shown, the bus bar 30 may be wavy in shape, and the groove 31 may be a trough of the wavy shape.

[0105] For example, in some embodiments, Fig.10 As shown, when there is no welding strip connection between the bus bar 30 and the insulating layer 40, an adhesive layer 61 can be provided between the bus bar 30 and the insulating layer 40. The adhesive layer 61 is bonded between the bus bar 30 and the insulating layer 40, which can improve reliability and mechanical strength, avoid displacement such as dislocation of the insulating layer 40, and improve the reliability and mechanical performance of the photovoltaic module 100. For example, Figure 4 An adhesive layer 61 is provided between the bus bar 30 and the insulating layer 40 of the embodiment. Figure 6 An adhesive layer 61 is provided between the bus bar 30 and the first insulating portion 41. Figure 7 In the exemplary embodiment, an adhesive layer 61 is disposed between the bus bar 30 and the second insulating portion 42 .

[0106] It should be noted that if Fig.12As shown, the insulating layer 40 may include a first sub-insulating film 401, a second sub-insulating film 402 and a third sub-insulating film 403 which are stacked, and the first sub-insulating film 401 and the third sub-insulating film 403 are elastomeric materials. By way of example, the second sub-insulating film 402 is sandwiched between the first sub-insulating film 401 and the third sub-insulating film 403. By way of example, the second sub-insulating film 402 may be a non-elastic material to play an insulating and supporting role. By way of example, the first sub-insulating film 401 and the third sub-insulating film 403 are 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 401 and the third sub-insulating film 403 can buffer the external stress and avoid damage to the battery cell.

[0107] It should be noted that in some implementation situations, please combine Figure 8 As shown, the insulating layer 40 can extend from the back side 11b to the gap between the second curved section 522 and the side edge of the second battery cell 20 along the first direction X, and the insulating layer 40 can extend from the back side 11b to the gap between the first curved section 512 and the side edge of the first battery cell 10 along the first direction X, thereby buffering external impact force and protecting the edges of the battery cells.

[0108] 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.

[0109] 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 both have a front side and a back side disposed opposite to each other, and the first battery cell and the second battery cell both have electrodes located on the front side and the back side; A bus bar, at least partially disposed on the back side of the first battery cell and the second battery cell; An insulating layer, at least disposed between the back surface of the first battery cell and the bus bar; a first welding strip and a second welding strip; The first welding strip is bent from the front side of the first battery cell to the back side of the first battery cell to electrically connect the electrode on the front side of the first battery cell and the bus bar; The second welding ribbon is electrically connected to the electrode on the back side of the second battery cell and the bus bar respectively; The first welding strip comprises a first connecting section, a first bending section and a second connecting section which are connected in sequence, the first connecting section is arranged on a side of the front side of the first battery cell which is away from the back side, the second connecting section is arranged on a side of the back side of the second battery cell which is away from the front side, and the first bending section is arranged to be bent in an arc shape; The insulating layer includes a first insulating portion and a second insulating portion, wherein the first insulating portion is disposed between the back surface of the first battery cell and the bus bar, and the second insulating portion is disposed between the back surface of the second battery cell and the bus bar; The second welding strip is bent from a side of the second insulating portion close to the second battery cell to a side of the second insulating portion away from the second battery cell, so as to be electrically connected to the electrode on the back side of the second battery cell and the bus bar respectively; The second welding strip includes a third connecting section, a second bending section and a fourth connecting section connected in sequence, the third connecting section is arranged between the back side of the second battery cell and the second insulating portion, the fourth connecting section is arranged on a side of the second insulating portion away from the second battery cell, and the second bending section is bent in an arc shape.

2. The photovoltaic module according to claim 1, characterized in that: In a direction parallel to the plane where the first battery cell is located, the first curved section and the second curved section are both located on the same side of the bus bar.

3. The photovoltaic module according to claim 2, characterized in that: Along a thickness direction parallel to the first battery sheet, the second connecting section and the fourth connecting section are arranged on the same side of the bus bar.

4. The photovoltaic module according to claim 3, characterized in that: The second connecting section is arranged on a side of the bus bar away from the first insulating portion, and the fourth connecting section is arranged on a side of the bus bar away from the second insulating portion; or, The second connecting section is disposed between the bus bar and the first insulating portion, and the fourth connecting section is disposed between the bus bar and the second insulating portion.

5. The photovoltaic module according to claim 2, characterized in that: Along a thickness direction parallel to the first battery sheet, the second connecting section and the fourth connecting section are arranged on different sides of the bus bar.

6. The photovoltaic module according to claim 5, characterized in that: The second connecting section is arranged on a side of the bus bar away from the first insulating portion, and the fourth connecting section is arranged between the bus bar and the second insulating portion; or, The second connecting section is disposed between the bus bar and the first insulating portion, and the fourth connecting section is disposed on a side of the bus bar away from the second insulating portion.

7. The photovoltaic module according to claim 1, characterized in that: The first connecting segment and the second connecting segment are spaced apart in the first direction, and the spacing between the first connecting segment and the second connecting segment in the first direction is 0.5 mm to 3 mm; and / or, The first curved section is spaced apart from a side edge of the first battery cell along the first direction, and a distance between the first curved section and a side edge of the first battery cell along the first direction is 0.3 to 2 mm.

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