Photovoltaic module

Abstract

This application relates to a photovoltaic module, which includes: a first cell and a second cell arranged along a first direction. Both the first cell and the second cell have a front side and a back side arranged opposite to each other, and both the first cell and the second cell are provided with a first solder strip on the front side and a second solder strip on the back side; and a bus bar. Wherein, the bus bar includes a first part and a second part connected along the first direction. The first part is located on the side of the back side of the first cell away from the front side and is electrically connected to the second solder strip of the first cell; a part of the second part is located on the side of the back side of the second cell away from the front side, and another part of the second part is located on the side of the front side of the second cell away from the back side and is electrically connected to the first solder strip of the second cell. This application can improve the area utilization rate and 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 cell 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, which 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 ribbon 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 chips are placed on the same plane. The bus bar occupies a part of the area in the photovoltaic module, resulting in a reduction in the effective sunlight-receiving area of the photovoltaic module, and 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 address the problem that the bus bar and the cell chips 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 arranged opposite to each other, and both the first cell chip and the second cell chip are provided with a first solder ribbon on the front side and a second solder ribbon on the back side; and

[0007] A bus bar;

[0008] Wherein, the bus bar includes a first part and a second part connected along the first direction, the first part is located on the side of the back side of the first cell chip away from the front side, and is electrically connected to the second solder ribbon of the first cell chip;

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

[0010] In some embodiments, the second portion includes a first segment, a bent segment, and a second segment connected in sequence. The first segment is located on the back side of the second solar cell away from the front side;

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

[0012] One end of the bent segment close to the first segment to one end of the bent segment close to the second segment is bent in an arc shape.

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

[0014] In some embodiments, in a direction perpendicular to the first direction and parallel to the plane where the second solar cell is located, the widths of the first portion and the first segment are both 3 mm to 8 mm; and / or,

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

[0016] In some embodiments, the bus bar further has a hollow hole, and the hollow hole is at least provided in the bent segment.

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

[0018] The bent segment includes a first connecting strip located between two adjacent hollow holes;

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

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

[0021] The hollow hole extends from the bent segment to the first segment;

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

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

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

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

[0026] In some embodiments, the photovoltaic module further includes:

[0027] A first insulating film disposed between the first section and the second battery cell.

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

[0029] In the embodiments of the present application, a first part is located on the side of the back surface of the first battery cell away from the front surface and is electrically connected to the second welding electrode of the first battery cell; a part of a second part is located on the side of the back surface of the second battery cell away from the front surface, and another part of the second part is located on the side of the front surface of the second battery cell away from the back surface and is electrically connected to the first welding electrode of the second battery cell. In a first aspect, 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 first part of the bus bar does not need to separately occupy the area of the photovoltaic module, increasing the area of the photovoltaic module receiving sunlight, thereby increasing the effective power generation area and improving the area utilization rate and the module power of the photovoltaic module. In a second aspect, compared with the second part (or the first section) and the battery cell being on the same plane, the present application can reduce the area of another part (the second section) of the second part located on the side of the front surface of the second battery cell away from the back surface, increasing the area of the photovoltaic module receiving sunlight, thereby increasing the effective power generation area and improving the area utilization rate and the module power of the photovoltaic module. In a third aspect, the first part and the second part (or the first section) cooperate with each other to increase the area of the photovoltaic module receiving sunlight together, thereby increasing the effective power generation area and improving the area utilization rate and the module power of the photovoltaic module. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments or exemplary embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 A perspective view of a photovoltaic module provided in some embodiments of the present application.

[0032] Figure 2 A top view of a photovoltaic module provided in some embodiments of the present application.

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

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

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

[0036] Figure 6 A cross-sectional view of the bus bar of a photovoltaic module provided in some embodiments of the present application.

[0037] Figure 7 A cross-sectional view of the first insulating film of a photovoltaic module provided in some embodiments of the present application. Detailed implementation manners

[0038] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will provide a detailed description of the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description 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. Those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "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, and therefore should not be construed as a limitation on the present application.

[0040] 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 defined.

[0041] 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.

[0042] 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 in indirect 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.

[0043] 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 any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0044] Referring to Figures 1 to 6 。 Figure 1 A three-dimensional schematic diagram of a photovoltaic module provided for some embodiments of the present application. Figure 2 A top view schematic diagram of a photovoltaic module provided for some embodiments of the present application. Figure 3 The first top view schematic diagram of the bus bar of a photovoltaic module provided for some embodiments of the present application. Figure 4 The second top view schematic diagram of the bus bar of a photovoltaic module provided for some embodiments of the present application. Figure 5 The third top view schematic diagram of the bus bar of a photovoltaic module provided for some embodiments of the present application. Figure 6 A cross-sectional schematic diagram of the bus bar of a photovoltaic module provided for some embodiments of the present application. Figure 7 A cross-sectional schematic diagram of the first insulating film of a photovoltaic module provided for some embodiments of the present application. Figure 6 For Figure 2 The cross-sectional schematic diagram in the direction of the dashed line C-C in Figures 3 to 5 A top view schematic diagram showing the bus bar's second part's bending section before bending or when not bent.

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

[0046] 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 sets of photovoltaic cell strings, a second encapsulant film, and a backsheet. The photovoltaic cell string includes multiple serially-connected solar cells (cell string). The cover plate, the first encapsulant film, multiple sets of photovoltaic cell 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.

[0047] Exemplarily, in some embodiments, the first encapsulant film and the second encapsulant film can be ethylene-vinyl acetate copolymer (EVA) encapsulant film, polyethylene octene co-elastic body (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.

[0048] Exemplarily, in some embodiments, the cover plate is disposed on the side of the first encapsulant film away from the solar cells (the side of the front surface 11a away from the back surface 11b). The cover plate can use 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, and play a protective role for the solar cells. The glass used for the cover plate can be ultra-white embossed photovoltaic 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.

[0049] Exemplarily, in some embodiments, the backsheet is disposed on the side of the second encapsulant film away from the solar cells (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 cells, and has good weather resistance, water resistance, corrosion resistance, and insulation properties, etc. It can not only isolate the photovoltaic module from the surrounding photovoltaic environment, but also effectively protect and support the solar cells, thereby increasing the impact resistance of the photovoltaic module. The backsheet can be made of glass material (for example, rolled glass or ultra-white rolled glass), TPT (polyvinyl fluoride composite film), or TPE (thermoplastic elastomer), etc.

[0050] Exemplarily, the photovoltaic module 100 can include multiple cell strings. The first solar cell 10 and the second solar cell 20 can be the end solar cells in two adjacent cell strings respectively, but are not limited thereto.

[0051] 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.

[0052] Exemplarily, the back surfaces 11b of the first solar cell 10 and the second solar cell 20 refer to the sides facing away from sunlight.

[0053] Exemplarily, first electrodes may be disposed on the front surfaces 11a of the first solar cell 10 and the second solar cell 20, and second electrodes may be disposed on the back surfaces 11b of the first solar cell 10 and the second solar cell 20. The first electrode may be one of a positive grid and a negative grid, and the second electrode may be the other of the positive grid and the negative grid.

[0054] Exemplarily, the first solar cell 10 and the second solar cell 20 are each provided with a first solder strip 12a on the front surface 11a and a second solder strip 12b on the back surface 11b. The first solder strip 12a may be connected to the first electrode on the front surface 11a, and the second solder strip 12b may be connected to the second electrode on the back surface 11b.

[0055] 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 strips, but are not limited thereto.

[0056] Exemplarily, the first portion 31 is located on the side of the back surface 11b of the first solar cell 10 away from the front surface 11a. The first portion 31 may be directly in contact with or directly welded to the second solder strip 12b on the back surface 11b of the first solar cell 10.

[0057] 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 includes a first portion 31 and a second portion 32 connected along the first direction X. The first portion 31 is located on the side of the back surface 11b of the first solar cell 10 away from the front surface 11a, such that the first portion 31 of the bus bar 30 does not separately occupy the area of the photovoltaic module 100, 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.

[0058] Exemplarily, a part of the second portion 32 electrically connected to the second solder strip 12b of the first solar cell 10 is located on the side of the back surface 11b of the second solar cell 20 away from the front surface 11a, and another part of the second portion 32 is located on the side of the front surface 11a of the second solar cell 20 away from the back surface 11b and is electrically connected to the first solder strip 12a of the second solar cell 20. At this time, the area of the other part of the second portion 32 located on the side of the front surface 11a of the second solar cell 20 away from the back surface 11b can be reduced. Compared with the prior art where the second portion 32 (or the first section 321) and the solar cell are on the same plane, the present application increases 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.

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

[0060] In some embodiments, the second part 32 includes a first section 321, a bending section 322, and a second section 323 that are connected in sequence. The first section 321 is located on the side of the back surface 11b of the second solar cell 20 away from the front surface 11a; the second section 323 is located on the side of the front surface 11a of the second solar cell 20 away from the back surface 11b and is electrically connected to the first solder strip 12a of the second solar cell 20; the bending section 322 is curved in an arc shape from the end close to the first section 321 to the end close to the second section 323.

[0061] Exemplarily, the bending section 322 is curved in an arc shape from the end close to the first section 321 to the end close to the second section 323, so that the second section 323 of the second part 32 is connected to the first solder strip 12a of the front surface 11a of the second solar cell 20.

[0062] Exemplarily, as Figure 6 shown, the bending section 322 is curved in an arc shape from the end close to the first section 321 to the end close to the second section 323, which can reduce the risk of the bending section 322 breaking.

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

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

[0065] Exemplarily, as Figure 3 and Figure 4 shown, in a direction perpendicular to the first direction X and parallel to the plane of the second solar cell 20, the width of the second segment 323 is smaller than the width of the first segment 321, that is, the second width d2 is smaller than the first width d1. The second segment 323 functions to connect the first solder strip 12a on the front surface 11a of the second solar cell 20. The second segment 323 can have a smaller width, thereby reducing the area of the front surface blocked by the second segment 323, increasing the area of the front surface 11a of the second solar cell 20 receiving sunlight, thereby increasing the effective power generation area and improving the conversion efficiency of the photovoltaic module. The larger first width d1 can reduce the resistance of the bus bar 30 to transmit current along the first direction X.

[0066] In some embodiments, in a direction perpendicular to the first direction X and parallel to the plane of the second solar cell 20, the widths of both the first part 31 and the first segment 321 are from 3 mm to 8 mm.

[0067] Exemplarily, as Figure 4 shown, the widths of the first part 31 and the first segment 321 can be equal. For example, the widths of both the first part 31 and the first segment 321 are the first width d1, and the first width d1 is from 3 mm to 8 mm.

[0068] Exemplarily, as Figure 3 shown, the widths of the first part 31 and the first segment 321 can be unequal. For example, the width of the first segment 321 is greater than the width of the first part 31 to reduce the impedance of the bus bar 30 to transmit current along the first direction X.

[0069] Exemplarily, as Figure 3 and Figure 4 shown, the widths of both the first part 31 and the first segment 321 can be any one of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm to reduce the impedance of the first part 31 and the first segment 321 to transmit current along the first direction X.

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

[0071] Exemplarily, as Figure 3 shown, in a direction perpendicular to the first direction X and parallel to the plane of the second solar cell 20, the width of the second segment 323 is 3 mm to 8 mm, that is, the second width d2 is 3 mm to 8 mm.

[0072] Exemplarily, the second width d2 can be any value among 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm to ensure a firm connection between the second segment 323 and the first solder strip 12a on the front surface 11a of the second solar cell 20.

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

[0074] Exemplarily, as Figure 3 shown, the bus bar 30 further has a hollow hole 324, and the hollow hole 324 is at least provided in the bent segment 322, which can reduce the bending stress of the bent portion and release a certain amount of bending stress at the hollow hole 324, thereby reducing the risk of damage such as fracture after the bent segment 322 is bent or folded, and also reducing the risk of cracking at the edge of the solar cell here.

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

[0076] Exemplarily, as Figure 3 and Figure 4 shown, in a direction parallel to the first direction X and parallel to the plane of the second solar cell 20, the width of the first connecting strip 32t1 is 1 mm to 3 mm, that is, the width of the first connecting strip 32t1 is the third width d3, and the third width d3 is 1 mm to 3 mm.

[0077] Exemplarily, the third width d3 can be any value among 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. A smaller third width d3 is convenient for bending or folding and can reduce the risk of damage such as fracture after the bent segment 322 is bent or folded.

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

[0079] Exemplarily, as Figure 4 shown, the main body portion 32z of the first section 321 extends along the first direction X, and the main body portion 32z is connected to the first portion 31. The hollow hole 324 extends from the bent section 322 to the first section 321. The second connecting bar 32t2 is located between two adjacent hollow holes 324, and the second connecting bar 32t2 is connected between the main body portion 32z and the bent section 322.

[0080] Exemplarily, as Figure 4 shown, the hollow hole 324 extends from the bent section 322 to the first section 321, so that the width of the first section 321 in the direction perpendicular to the first direction X is reduced, reducing the facing area between the first section 321 and the second solder strip 12b on the back surface 11b of the second solar cell 20, and reducing the short - circuit risk between the first section 321 and the second solder strip 12b on the back surface 11b of the second solar cell 20.

[0081] In some embodiments, as Figure 5 shown, the bus bar 30 has a plurality of hollow holes 324; the plurality of hollow holes 324 are arranged in sequence along the first direction X, and the hollow holes 324 penetrate through the bus bar 30 in the thickness direction, and extend from the bent section 322 to the second section 323; the bent section 322 and the second section 323 include a third connecting bar 32t3 located between two adjacent hollow holes 324, and the third connecting bar 32t3 is electrically connected to the corresponding first solder strip 12a on the front surface 11a of the second solar cell respectively.

[0082] Exemplarily, the hollow hole 324 penetrates through the bus bar 30 in the thickness direction and extends from the bent section 322 to the second section 323, so that the second section 323 is composed of a plurality of third connecting bars 32t3, and the third connecting bars 32t3 are electrically connected to the corresponding first solder strips 12a on the front surface 11a of the second solar cell 20 respectively. The area of the second section 323 can be better reduced, so that the area of the second part 32 of the bus bar 30 covering the second solar cell 20 on the front surface is smaller, and the area of the front surface 11a of the second solar cell 20 receiving sunlight is better increased, thereby better increasing the effective power generation area and better improving the conversion efficiency of the photovoltaic module.

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

[0084] Exemplarily, the first insulating film 40 is disposed between the first section 321 and the second solar cell 20, which can prevent short circuit between the first section 321 and the second solder strip 12b on the back surface 11b of the second solar cell 20.

[0085] In some embodiments, as Figure 7 shown, the first insulating film 40 includes a first sub-insulating film 41, a second sub-insulating film 42 and a third sub-insulating film 43 which are stacked, and the first sub-insulating film 41 and the third sub-insulating film 43 are made of elastomeric materials.

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

[0087] Exemplarily, the second sub-insulating film 42 can be made of a non-elastomeric material to play the roles of insulation and support.

[0088] Exemplarily, the first sub-insulating film 41 and the third sub-insulating film 43 are made of elastomeric materials, so as to play a buffering role. For example, when the bus bar 30 is subjected to an external impact force, the first sub-insulating film 41 and the third sub-insulating film 43 can buffer the external stress and prevent damage to the solar cells.

[0089] Exemplarily, an adhesive layer can also be provided between the first insulating film 40 and the bus bar to bond the first insulating film 40 and the bus bar, playing the role of enhancing fixation and preventing the first insulating film 40 or the bus bar from moving.

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

[0091] Exemplarily, the first portion 31 can be directly in contact and connected with the second solder strip 12b on the back surface 11b of the first solar cell 10.

[0092] Exemplarily, a plurality of first grooves are provided on the surface of one side of the first portion 31 close to the adjacent second solder strip 12b, and at least a part of the second solder strip 12b is received in the corresponding first groove, so that the bus bar 30 has the function of fixing the second solder strip 12b, or the second solder strip 12b has the function of fixing the bus bar 30, preventing the solder strip or the bus bar from moving.

[0093] In some embodiments, a plurality of second grooves are provided on one side of the second portion 32 close to the adjacent first solder strip 12a, and at least a part of the first solder strip 12a is received in the corresponding second groove.

[0094] Exemplarily, on one side of the second part 32 adjacent to the first solder tape 12a near the second solar cell 20, a plurality of second grooves are provided. On the surface of the second section 323 near the first solder tape 12a, a plurality of second grooves are provided. At least a part of the first solder tape 12a is received in the corresponding second grooves, so that the bus bar 30 has the function of fixing the first solder tape 12a, or the first solder tape 12a has the function of fixing the bus bar 30, avoiding the movement of the solder tape or the bus bar.

[0095] Exemplarily, in some embodiments, at least part of the bus bar 30 is in a wavy shape, and the thickness of each part of the wavy shape is the same. The first groove and / or the second groove can be the trough of the wavy shape.

[0096] 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-described 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.

[0097] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting 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 shall be subject to the appended claims.

Claims

1. A photovoltaic module, characterized in that: include: A first battery cell and a second battery cell arranged along a first direction, wherein the first battery cell and the second battery cell each have a front side and a back side disposed opposite to each other, and the first battery cell and the second battery cell each are provided with a first welding strip located on the front side and a second welding strip located on the back side; and Busbars; The bus bar includes a first portion and a second portion connected along the first direction, the first portion is located on a side of the back side of the first battery cell away from the front side, and is electrically connected to the second welding strip of the first battery cell; A portion of the second portion is located on a side of the back side of the second battery cell away from the front side, and another portion of the second portion is located on a side of the front side of the second battery cell away from the back side, and is electrically connected to the first welding strip of the second battery cell; The second portion includes a first section, a bent section, and a second section connected in sequence, wherein the first section is located on the back side of the second battery sheet away from the front side; The second section is located on a side of the front side of the second battery cell away from the back side, and is electrically connected to the first welding strip of the second battery cell; The curved section is curved in an arc shape from one end of the curved section close to the first section to one end of the curved section close to the second section; The first portion connects the first segment, the first segment connects the curved segment, and the curved segment connects the second segment.

2. The photovoltaic module according to claim 1, characterized in that: In a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second section is smaller than the width of the first section.

3. The photovoltaic module according to claim 1, characterized in that: In a direction perpendicular to the first direction and parallel to the plane where the second battery sheet is located, the width of the first portion and the first section are both 3 mm to 8 mm; and / or, In a direction perpendicular to the first direction and parallel to the plane where the second battery cell is located, the width of the second segment is 3 mm to 8 mm.

4. The photovoltaic module according to claim 1, characterized in that: The bus bar further has a hollow hole, and the hollow hole is at least arranged in the bending section.

5. The photovoltaic module according to claim 4, characterized in that: The bus bar has a plurality of hollow holes; The curved section comprises a first connecting strip located between two adjacent hollow holes; In a direction parallel to the first direction and parallel to the plane where the second battery cell is located, a width of the first connecting strip is 1 mm to 3 mm.

6. The photovoltaic module according to claim 4, characterized in that: The bus bar has a plurality of hollow holes; The hollow hole extends from the curved section to the first section; The first section includes a main body connected to the first portion along the first direction, and a second connecting strip located between two adjacent hollow holes, wherein the second connecting strip is connected between the main body and the curved section.

7. The photovoltaic module according to claim 4, characterized in that: The bus bar has a plurality of hollow holes; The plurality of hollow holes are sequentially arranged along the first direction, and the hollow holes are arranged through the thickness direction of the bus bar and extend from the bent section to the second section; The curved section and the second section include a third connecting bar located between two adjacent hollow holes, and the third connecting bar is electrically connected to the corresponding first welding strips on the front side of the second battery cell respectively.

8. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises: The first insulating film is disposed between the first segment and the second battery cell.

9. The photovoltaic module according to claim 8, characterized in that: The first insulating film includes a first sub-insulating film, a second sub-insulating film, and a third sub-insulating film which are stacked, and the first sub-insulating film and the third sub-insulating film are made of an elastic material.

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