Photovoltaic module

Abstract

The invention relates to a photovoltaic module, and the photovoltaic module comprises a first battery piece and a second battery piece which are arranged along a first direction, the first battery piece and the second battery piece are respectively provided with a front surface and a back surface which are arranged in a back-to-back manner, and the first battery piece and the second battery piece are respectively provided with electrodes located on the front surfaces and the back surfaces; the bus bar is at least partially arranged on the back surface of the battery string; the insulating layer is at least arranged between the back surface of the first battery piece and the bus bar; a first solder strip and a second solder strip; wherein the first welding strip is bent from the front surface of the first battery piece to the back surface of the first battery piece so as to be electrically connected between the electrode on the front surface of the first battery piece and the bus bar; and the second welding strip is electrically connected with the electrode on the back surface of the second battery piece and the bus bar respectively. The photovoltaic module can solve the problems of low area utilization rate and low module power of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the technical field of solar cell manufacturing, and particularly to a photovoltaic module. Background Art

[0002] As a new type of energy, solar energy has various advantages such as being inexhaustible, clean and environmentally friendly compared with traditional fossil fuels. Currently, one of the main ways to utilize solar energy is to convert the received light energy into electrical energy output through a solar cell module, which can be a large-area battery module formed by encapsulating a number of solar cells (or photovoltaic cells, or photovoltaic modules) in series and arranging them in a square array. Among them, the solar cell absorbs light energy, and the accumulation of opposite-sign charges appears at both ends of the cell, that is, "photogenerated voltage" is generated. This is the "photovoltaic effect". Under the action of the photovoltaic effect, an electromotive force is generated at both ends of the solar cell, thereby converting light energy into electrical energy. In a photovoltaic module, the function of the solder tape and the bus bar is to conduct the current collected by the solar cell chips into the junction box. The bus bar, as the current lead-out wire in the solar module, plays an important role.

[0003] However, in the prior art, the bus bar is arranged between two adjacent cell chips, that is, the bus bar and the cell chip are placed on the same plane. The bus bar occupies a part of the area in the photovoltaic module, reducing the effective sunlight-receiving area of the photovoltaic module and lowering 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 address the problem that the bus bar and the cell chip are placed on the same plane, reducing the area utilization rate and module power of the photovoltaic module.

[0005] This application provides a photovoltaic module, including:

[0006] A first cell chip and a second cell chip arranged along a first direction. Both the first cell chip and the second cell chip have a front side and a back side that are opposite to each other, and electrodes located on the front side and the back side are provided on both the first cell chip and the second cell chip;

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

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

[0009] A first solder tape and a second solder tape;

[0010] Wherein, the first solder tape is bent from the front side of the first cell chip to the back side of the first cell chip to be electrically connected between the electrode on the front side of the first cell chip and the bus bar;

[0011] The second solder tape is electrically connected to the electrode on the back surface and the bus bar of the second solar cell respectively.

[0012] In some embodiments, the first solder tape includes a first connection segment, a first bending segment, and a second connection segment connected in sequence. The first connection segment is disposed on a side of the front surface of the first solar cell facing away from the back surface, the second connection segment is disposed on a side of the back surface of the second solar cell facing away from the front surface, and the first bending segment is bent in an arc shape.

[0013] In some embodiments, the surface of the bus bar near the second solar cell is directly connected to the electrode on the back surface of the second solar cell through the second solder tape.

[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 surface of the first solar cell and the bus bar, and the second insulating portion is disposed between the back surface of the second solar cell and the bus bar;

[0015] The second solder tape is bent from a side of the second insulating portion close to the second solar cell to a side of the second insulating portion away from the second solar cell, so as to be electrically connected to the electrode on the back surface and the bus bar of the second solar cell respectively.

[0016] In some embodiments, the second solder tape includes a third connection segment, a second bending segment, and a fourth connection segment connected in sequence. The third connection segment is disposed between the back surface of the second solar cell and the second insulating portion, the fourth connection segment is disposed on a side of the second insulating portion away from the second solar cell, and the second bending segment is bent in an arc shape;

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

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

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

[0020] The second connection segment is disposed between the bus bar and the first insulating portion, and the fourth connection segment 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 3The second three - dimensional schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0031] Figure 4 The second side - view schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0032] Figure 5 The third side - view schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0033] Figure 6 The fourth side - view schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0034] Figure 7 The fifth side - view schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0035] Figure 8 The top - view schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0036] Figure 9 The first cross - sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0037] Figure 10 The second cross - sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0038] Figure 11 The third cross - sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application.

[0039] Figure 12 The cross - sectional schematic diagram of the insulating layer of a photovoltaic module provided by some embodiments of the present application. Detailed implementation manners

[0040] To make the above - mentioned objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 departing from the connotation of the present application. Therefore, 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 there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0042] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0043] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "connected to", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0046] Refer to Figures 1 to 8 。 Figure 1 The first three-dimensional schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 2 The first side view schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 2 For Figure 1 The side view schematic diagram of the photovoltaic module in

[0047] Figure 3 The second three-dimensional schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 4 The second side view schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 4 For Figure 3 The side view schematic diagram of the photovoltaic module in

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

[0049] Figure 8 The top view schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 8 For Figure 3 The top view schematic diagram of

[0050] Figure 9 The first cross-sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 10 The second cross-sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figure 11 The third cross-sectional schematic diagram of a photovoltaic module provided by some embodiments of the present application. Figures 9 to 11 For Figure 8 The cross-sectional structure of the busbar part in the first direction X in

[0051] Figure 12 The cross-sectional schematic diagram of an insulating layer of a photovoltaic module provided by some embodiments of the present application.

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

[0053] Exemplarily, in some embodiments, the photovoltaic module 100 includes a laminate and a frame. The laminate includes a cover plate, a first encapsulant film, multiple groups of photovoltaic module strings, a second encapsulant film, and a backsheet. The photovoltaic module string includes multiple cells (battery string) connected in series. The cover plate, the first encapsulant film, multiple groups of photovoltaic module strings, the second encapsulant film, and the backsheet are laminated to obtain the laminate, and the laminate is assembled with the frame to form the photovoltaic module 100, but the structure of the photovoltaic module 100 is not limited thereto.

[0054] Exemplarily, in some embodiments, the first encapsulant film and the second encapsulant film can be ethylene-vinyl acetate copolymer (EVA) encapsulant film, polyethylene octene copolymer elastomer (POE) encapsulant film, or polyethylene terephthalate (PET) encapsulant film, and can also be PVB encapsulant film, EPE encapsulant film (EVA and POE three-layer co-extruded encapsulant film), EP encapsulant film (EVA and POE two-layer co-extruded encapsulant film), or other types of encapsulant films, which can be selected according to actual needs and are not limited herein.

[0055] Exemplarily, in some embodiments, the cover plate is disposed on one side of the first encapsulant film away from the cell (the side where the front surface 11a is away from the back surface 11b). The cover plate can be made of transparent materials such as glass or polymer materials. When the cover plate uses glass, it is also called "photoelectric glass", which has good light transmittance and high hardness. After covering the first encapsulant film, it can adapt to a large day-night temperature difference and harsh weather environment, playing a protective role for the cells. 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 panel glass, which can be selected according to actual needs and are not limited herein.

[0056] Exemplarily, in some embodiments, the backsheet is disposed on the side of the second encapsulant film away from the solar cell (the side of the back surface 11b away from the front surface 11a). The backsheet also plays a role in protecting and supporting the solar cell, and has good weather resistance, water resistance, corrosion resistance, insulation properties, etc. It can both isolate the photovoltaic module from the surrounding photovoltaic environment and effectively protect and support the solar cell, thereby increasing the impact resistance of the photovoltaic module. The backsheet can be made of glass material (e.g., rolled glass or ultra-white rolled glass), TPT (polyvinyl fluoride composite film), TPE (thermoplastic elastomer), etc.

[0057] Exemplarily, the photovoltaic module 100 may include a plurality of cell strings. The first solar cell 10 and the second solar cell 20 may be the end solar cells in two adjacent cell strings respectively, but are not limited thereto.

[0058] Exemplarily, the front surface 11a 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 receives sunlight irradiation, or the side that mainly receives sunlight irradiation.

[0059] Exemplarily, the back surface 11b of the first solar cell 10 and the second solar cell 20 refers to the side away from sunlight.

[0060] Exemplarily, a first electrode 12a may be disposed on the front surface 11a of both the first solar cell 10 and the second solar cell 20, and a second electrode 12b may be disposed on the back surface 11b of both the first solar cell 10 and the second solar 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] Exemplarily, in some embodiments, the first solder ribbon 51 may be directly electrically connected to the first electrode 12a on the front surface 11a of the first solar cell 10. Exemplarily, in some embodiments, the first solder ribbon 51 may also be electrically connected to the first electrode 12a on the front surface 11a of the first solar cell 10 through a first sub-solder ribbon. Exemplarily, in some embodiments, the first solder ribbon 51 and the first sub-solder ribbon may be different solder ribbons. Exemplarily, in some embodiments, the first solder ribbon 51 and the first sub-solder ribbon may be an integrally formed structure or the same solder ribbon.

[0062] Exemplarily, the photovoltaic module 100 may include a plurality of cell strings. A plurality of serially connected solar cells may be included in the same cell string. For example, the serially connected solar cells in the same cell string may be connected by solder ribbons, but are not limited thereto.

[0063] Exemplarily, the bus bar 30 is at least partially disposed on the back surface 11b of the cell string, and in the thickness direction of the solar cell, the bus bar 30 and the solar cell are at least partially overlapped. In some embodiments, the bus bar 30 is entirely disposed on the back surface 11b of the cell string.

[0064] Exemplarily, compared with the prior art where the bus bar and the solar cell are placed on the same plane, in the present application, the bus bar 30 is at least partially disposed on the back surface 11b of the battery string, reducing the area occupied by the bus bar 30 in the photovoltaic module and increasing the area of the photovoltaic module 100 receiving sunlight, thereby increasing the effective power generation area and improving the area utilization rate and the module power of the photovoltaic module 100.

[0065] Exemplarily, the insulating layer 40 is at least disposed between the back surface 11b of the first solar cell 10 and the bus bar 30, which can prevent the bus bar 30 from short - circuiting with the second electrode 12b on the back surface 11b of the first solar cell 10.

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

[0067] Exemplarily, Figure 1 It is shown 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 solar cell 10 is located.

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

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

[0070] Exemplarily, the first bending segment 512 is bent in an arc shape, which not only enables the first connection segment 511 to electrically connect the first electrode 12a on the front surface 11a of the first solar cell 10 and the second connection segment 513 to electrically connect the bus bar 30 on the back surface 11b of the first solar cell 10, but also makes it less likely for the first bending segment 512 to break or be damaged.

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

[0072] Exemplarily, as Figure 1 and Figure 2 shown, the surface of the bus bar 30 close to the second cell 20 is directly connected to the electrode on the back surface 11b of the second cell 20 through the second solder tape 52, that is, the surface of the bus bar 30 close to the second cell 20 is in direct contact connection with the second electrode 12b or the second solder tape 52, having the effect of simple manufacturing process.

[0073] It should be noted that Figure 2 schematically shows that the second connecting section 513 is connected to the bus bar 30 between the insulating layer 40 and the bus bar 30, and the second connecting section 513 can also be connected to the bus bar 30 on the side of the bus bar 30 away from the insulating layer 40.

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

[0075] Exemplarily, different from Figures 1 - 2 the embodiment, in Figures 3 to 7 the embodiment, the second solder tape 52 is also bent. The second solder tape 52 is bent from the side of the second insulating part 42 close to the second cell 20 to the side of the second insulating part 42 away from the second cell 20, which can ensure that in the photovoltaic module 100, in the direction perpendicular to the thickness of the cell, the total thickness at the first cell 10 and the total thickness at the second cell 20 can be kept consistent, so that the bus bar 30 is in more firm contact with both the first solder tape 51 and the second solder tape 52, and the photovoltaic module 100 can maintain uniform stress when subjected to external forces, reducing the risk of damage such as fragmentation.

[0076] Exemplarily, the insulating layer 40 includes a first insulating portion 41 and a second insulating portion 42. The first insulating portion 41 is disposed between the back surface 11b of the first solar cell 10 and the bus bar 30. The first insulating portion 41 and the second insulating portion 42 may be independent or spaced insulating film layers, or may be an integrally formed structure or a single integral structure.

[0077] Exemplarily, the first insulating portion 41 and the second insulating portion 42 have the same thickness, which can better make the total thickness at the first solar cell 10 and the total thickness at the second solar cell 20 consistent, so that when the photovoltaic module 100 is subjected to an external force, the force can be evenly distributed, reducing the risk of damage such as fragmentation.

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

[0079] Exemplarily, the third connecting section 521 is disposed between the back surface 11b of the second solar cell 20 and the second insulating portion 42, and the third connecting section 521 can be directly electrically connected to the second electrode 12b on the back surface 11b of the second solar cell 20. Exemplarily, in some embodiments, the third connecting section 521 can also be electrically connected to the second electrode 12b on the back surface 11b of the second solar cell 20 through a second sub-solder strip. Exemplarily, in some embodiments, the second solder strip 52 and the second sub-solder strip can be different solder strips. Exemplarily, in some embodiments, the second solder strip 52 and the second sub-solder strip can be an integrally formed structure or the same solder strip.

[0080] Exemplarily, the fourth connecting section 523 is disposed on a side of the second insulating portion 42 away from the second solar cell 20, and the fourth connecting section 523 is connected to the bus bar 30.

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

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

[0083] Exemplarily, along the thickness direction parallel to the first cell 10, the second connecting section 513 and the fourth connecting section 523 are arranged on the same side of the bus bar 30, and the second connecting section 513 and the fourth connecting section 523 are connected or welded to the bus bar 30 on the same side of the bus bar 30, without the need to connect or weld on both sides of the bus bar, which can make the manufacturing process simpler.

[0084] In some embodiments, such as Figure 3 、 Figure 4 shown, the second connecting section 513 is arranged on the side of the bus bar 30 away from the first insulating part 41, and the fourth connecting section 523 is arranged on the side of the bus bar 30 away from the second insulating part 42.

[0085] Exemplarily, as Figure 3 、 Figure 4 shown, both the second connecting section 513 and the fourth connecting section 523 are connected to the bus bar 30 on the side of the bus bar 30 away from the insulating layer 40.

[0086] In some embodiments, such as Figure 5 shown, the second connecting section 513 is arranged between the bus bar 30 and the first insulating part 41, and the fourth connecting section 523 is arranged between the bus bar 30 and the second insulating part 42.

[0087] Exemplarily, as Figure 5 shown, both the second connecting section 513 and the fourth connecting section 523 are connected to the bus bar 30 between the bus bar 30 and the insulating layer 40.

[0088] In some embodiments, such as Figure 6 and Figure 7 shown, and please also refer to Figure 3 simultaneously, along the thickness direction parallel to the first cell 10, the second connecting section 513 and the fourth connecting section 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 section 511 and the second connecting section 513 in the first direction X is from 0.5 mm to 3 mm, that is, the distance between the orthographic projection of the first connecting section 511 on the plane where the first solar cell 10 is located and the orthographic projection of the second connecting section 513 on the plane where the first solar cell 10 is located is from 0.5 mm to 3 mm, as Figure 8 the first distance d1 in

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

[0098] Exemplarily, in some embodiments, the third connecting section 521 and the fourth connecting section 523 are spaced apart in the first direction X, and the distance between the third connecting section 521 and the fourth connecting section 523 in the first direction X is from 0.5 mm to 3 mm.

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

[0100] Exemplarily, as Figure 8 shown, the first bending section 512 is spaced apart from one side edge of the first solar cell 10 along the first direction X, and the distance between the first bending section 512 and one side edge of the first solar cell 10 along the first direction X is from 0.3 to 2 mm, that is, the orthographic projection of the first bending section 512 on the plane where the first solar cell 10 is located is spaced apart from the side edge of the first solar cell 10, and the distance between the orthographic projection of the first bending section 512 on the plane where the first solar cell 10 is located and the side edge of the first solar cell 10 is from 0.3 to 2 mm, as Figure 8 the second distance d2 in can avoid short - circuiting of the first solder tape 51 with structures on the first solar cell 10 that do not need to be connected. When subjected to external forces, the first bending section 512 has a space for buffering, which can reduce the risk of the first solar cell 10 being broken into pieces, etc.

[0101] Exemplarily, as Figure 8 shown, in some embodiments, the second bending section 522 is spaced apart from one side edge of the second solar cell 20 along the first direction X, and the distance between the second bending section 522 and one side edge of the second solar cell 20 along the first direction X is from 0.3 to 2 mm, that is, the orthographic projection of the second bending section 522 on the plane where the second solar cell 20 is located is spaced apart from the side edge of the second solar cell 20, and the distance between the orthographic projection of the second bending section 522 on the plane where the second solar cell 20 is located and the side edge of the second solar cell 20 is from 0.3 to 2 mm, as Figure 8The second distance d2 can prevent the second welding strip 52 from short - circuiting with the structures on the second solar cell 20 that do not need to be connected. When subjected to external forces, the second bending section 522 has a space for buffering, which can reduce the risk of the second solar cell 20 being broken into pieces and so on.

[0102] Exemplarily, the second distance d2 can be any value among 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 2 mm.

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

[0104] Exemplarily, in some embodiments, such as Figure 11 As shown, the bus bar 30 can be wavy, and the groove 31 is the trough of the wave shape.

[0105] Exemplarily, in some embodiments, such as Figure 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 also 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 enhance the reliability and mechanical strength, prevent the insulating layer 40 from being displaced such as misaligned, and improve the reliability and mechanical properties of the photovoltaic module 100. Exemplarily, an adhesive layer 61 can be provided between Figure 4 the bus bar 30 and the insulating layer 40 in the embodiment, an adhesive layer 61 can be provided between Figure 6 the exemplary bus bar 30 and the first insulating part 41, an adhesive layer 61 can be provided between Figure 7 the exemplary bus bar 30 and the second insulating part 42.

[0106] It should be noted that, such as Figure 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 that are stacked. The first sub-insulating film 401 and the third sub-insulating film 403 are made of an elastomeric material. Exemplarily, the second sub-insulating film 402 is sandwiched between the first sub-insulating film 401 and the third sub-insulating film 403. Exemplarily, the second sub-insulating film 402 may be made of a non-elastomeric material to play an insulating and supporting role. Exemplarily, the first sub-insulating film 401 and the third sub-insulating film 403 are made of an elastomeric material, so that they can play a buffering role. For example, when the bus bar 30 is subjected to an external impact force, the first sub-insulating film 401 and the third sub-insulating film 403 can buffer the external stress and prevent the solar cell from being damaged.

[0107] It should be noted that in some embodiments, please refer to Figure 8 As shown, the insulating layer 40 may extend from the back surface 11b to the space between the second bending section 522 and one side edge of the second solar cell 20 along the first direction X. The insulating layer 40 may extend from the back surface 11b to the space between the first bending section 512 and one side edge of the first solar cell 10 along the first direction X, so as to buffer the external impact force and protect the edges of the solar cells.

[0108] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0109] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A photovoltaic module, characterized in that, Comprising: A first solar cell and a second solar cell arranged in a first direction, both the first solar cell and the second solar cell having a front side and a back side disposed opposite to each other, and electrodes located on the front side and the back side are provided on both the first solar cell and the second solar cell; A bus bar, at least partially disposed on the back sides of the first solar cell and the second solar cell; An insulating layer, at least disposed between the back side of the first solar cell and the bus bar; A first solder tape and a second solder tape; Wherein, the first solder tape is bent from the front side of the first solar cell to the back side of the first solar cell to be electrically connected between the electrode on the front side of the first solar cell and the bus bar; The second solder tape is electrically connected to the electrode on the back side of the second solar cell and the bus bar respectively; A plurality of grooves are provided on at least one side surface of the bus bar close to at least one of the adjacent first solder tape and the second solder tape, and at least a part of at least one of the first solder tape and the second solder tape is received in the corresponding groove.

2. The photovoltaic module according to claim 1, characterized in that, The bus bar is wavy, and the groove is the trough of the wave shape.

3. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module further includes an adhesive layer, and the adhesive layer is disposed between the bus bar and the insulating layer; 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 solar cell and the bus bar, and the second insulating portion is disposed between the back side of the second solar cell and the bus bar; The adhesive layer is disposed between at least one of the first insulating portion and the second insulating portion and the bus bar.

4. The photovoltaic module according to claim 1, characterized in that, The first solder tape includes a first connecting section, a first bending section and a second connecting section connected in sequence, the first connecting section is disposed on the side of the front side of the first solar cell away from the back side, the second connecting section is disposed on the side of the back side of the second solar cell away from the front side, and the first bending section is bent in an arc shape.

5. The photovoltaic module according to claim 4, characterized in that, The surface of the bus bar close to the second solar cell is directly connected to the electrode on the back side of the second solar cell through the second solder tape.

6. The photovoltaic module according to claim 4, characterized in that, 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 solar cell and the bus bar, and the second insulating portion is disposed between the back side of the second solar cell and the bus bar; The second solder tape is bent from the side of the second insulating portion close to the second solar cell to the side of the second insulating portion away from the second solar cell to be electrically connected to the electrode on the back side of the second solar cell and the bus bar respectively.

7. The photovoltaic module according to claim 6, wherein The second solder tape includes a third connecting section, a second bending section and a fourth connecting section connected in sequence, the third connecting section is disposed between the back side of the second solar cell and the second insulating portion, the fourth connecting section is disposed on the side of the second insulating portion away from the second solar cell, and the second bending section is bent in an arc shape; In the direction parallel to the plane where the first solar cell is located, both the first bending section and the second bending section are located on the same side of the bus bar.

8. The photovoltaic module according to claim 7, wherein In a direction parallel to the thickness direction of the first solar cell, the second connecting section and the fourth connecting section are arranged on the same side of the bus bar.

9. The photovoltaic module according to claim 8, wherein, The second connecting section is arranged on the side of the bus bar away from the first insulating part, and the fourth connecting section is arranged on the side of the bus bar away from the second insulating part; or, The second connecting section is arranged between the bus bar and the first insulating part, and the fourth connecting section is arranged between the bus bar and the second insulating part.

10. The photovoltaic module according to claim 7, wherein In a direction parallel to the thickness direction of the first solar cell, the second connecting section and the fourth connecting section are arranged on different sides of the bus bar.

11. The photovoltaic module according to claim 10, wherein, The second connecting section is arranged on the side of the bus bar away from the first insulating part, and the fourth connecting section is arranged between the bus bar and the second insulating part; or, The second connecting section is arranged between the bus bar and the first insulating part, and the fourth connecting section is arranged on the side of the bus bar away from the second insulating part.

12. The photovoltaic module according to claim 4, wherein, The first connecting section and the second connecting section are arranged at intervals in the first direction, and the distance between the first connecting section and the second connecting section in the first direction is 0.5 mm to 3 mm; and / or, The first bending section and one side edge of the first solar cell in the first direction are arranged at intervals, and the distance between the first bending section and one side edge of the first solar cell in the first direction is 0.3 to 2 mm.

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