CN218867128U - Photovoltaic module - Google Patents

Abstract

The utility model relates to a photovoltaic module, photovoltaic module includes first battery cluster, the second battery cluster, first busbar and second busbar, first battery cluster and second battery cluster are connected, first busbar setting between first battery cluster and second battery cluster and with first battery cluster and second battery cluster electric connection, first busbar has the first surface and the second surface of carrying on the back mutually and setting up, first surface is towards photovoltaic module's front, the second surface is towards photovoltaic module's the back, first surface covers there is the black layer. One end of the second bus bar is connected with the second surface, and the other end of the second bus bar extends along a direction forming an included angle with the second surface. Above-mentioned photovoltaic module has avoided need buckling to first busbar, and then has avoided first busbar bending department to appear white spot bad problem, has realized that photovoltaic module's positive outward appearance is totally black.

Description

Photovoltaic module

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a photovoltaic module.

Background

With the increasing shortage of social energy, solar energy as a novel energy source is paid more and more attention, and a photovoltaic module plays an important role in the photovoltaic industry as an important constituent unit of a solar power generation system.

As the application range of the photovoltaic module is wider and wider, more and more customers put higher demands on the appearance of the photovoltaic module. Among them, the all-black photovoltaic module is more and more popular in the market due to its higher aesthetic property and photoelectric conversion efficiency. In order to achieve the effect of completely black appearance of the photovoltaic module, the cell, the frame and the back plate of the photovoltaic module are made of black materials. However, due to the limitations of conventional processes, conventional photovoltaic modules still use silver-colored, tin-coated bus bars, strictly speaking not "all-black photovoltaic modules". Some photovoltaic modules achieve the purpose of completely blackish appearance by coating a black coating or sticking a black adhesive film on the front surface of a silver-colored tin-coated bus bar, but the bus bar needs to be bent at a lead position to be connected with a back junction box. In the laminating process, white spots of the bus bars at the bent positions are poor, so that the appearance of the photovoltaic module cannot achieve a full black effect.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a photovoltaic module aiming at the problem of how to achieve the complete black appearance of the front surface of the photovoltaic module.

The technical scheme is as follows:

in one aspect, the present application provides a photovoltaic module comprising:

the first battery string and the second battery string are connected;

a first bus bar disposed between and electrically connected to the first cell string and the second cell string, the first bus bar having a first surface and a second surface disposed opposite to each other, the first surface facing a front side of a photovoltaic module, the second surface facing a back side of the photovoltaic module, the first surface being covered with a black layer; and (c) a second step of,

and one end of the second bus bar is connected with the second surface, and the other end of the second bus bar extends along the direction forming an included angle with the second surface.

The technical scheme of the application is further explained as follows:

in one embodiment, the second bus bar includes a connection portion and a lead-out portion, the connection portion is connected to the second surface, and an extending direction of the lead-out portion is disposed at an angle to the second surface.

In one embodiment, the projection of the first bus bar onto the back side perpendicular to the photovoltaic module covers the second bus bar.

In one embodiment, the width of the first bus bar is greater than or equal to the width of the second bus bar.

In one embodiment, the second surface is covered with a first conductive layer.

In one embodiment, at least one side surface of the second bus bar is covered with a second conductive layer.

In one embodiment, the photovoltaic module further includes a front plate and a first adhesive film layer, the front plate is disposed opposite to the first surface and covers the first cell string and the second cell string, and the front plate is bonded to the first cell string and the second cell string through the first adhesive film layer.

In one embodiment, the photovoltaic module further includes a back sheet and a second adhesive film layer, the back sheet is disposed opposite to the second surface and covers the first cell string and the second cell string, and the back sheet is bonded to the first cell string and the second cell string through the second adhesive film layer.

In one embodiment, the back plate is provided with a lead hole, and one end of the second bus bar, which is far away from the first bus bar, penetrates through the lead hole.

In one embodiment, the photovoltaic module further includes a conductive member, the first cell string and the second cell string are electrically connected by the conductive member, and the conductive member is connected to the first bus bar.

The photovoltaic module is characterized in that the first bus bar is electrically connected with the first battery string and the second battery string, so that the first bus bar can collect the currents of the first battery string and the second battery string. Meanwhile, the second bus bar is connected to the second surface of the first bus bar and extends along the direction forming an included angle with the second surface, so that the second bus bar can be used as a leading-out wire of the photovoltaic module to lead the current collected by the first bus bar out of the photovoltaic module, the first bus bar is prevented from being bent, the first bus bar is ensured to be uniformly stressed in the lamination process of the photovoltaic module, the problem that a black layer on the first surface falls off at the bent part due to bending of the first bus bar is avoided, the phenomenon that the photovoltaic module lacks glue at the bent part of the first bus bar is also avoided, white spot defect in the front appearance of the photovoltaic module is avoided, and the front appearance of the photovoltaic module is completely black.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a photovoltaic module according to an embodiment;

FIG. 2 is a cross-sectional view of a photovoltaic module according to an embodiment;

fig. 3 is a schematic diagram illustrating the first bus bar and the second bus bar according to an embodiment.

Description of reference numerals:

11. a first battery string; 12. a second battery string; 13. a conductive member; 20. a first bus bar; 21. a first surface; 22. a second surface; 23. an end face; 30. a second bus bar; 31. a connecting portion; 32. a lead-out section; 321. a side surface; 41. a front plate; 42. a first adhesive film layer; 51. a back plate; 52. a second adhesive film layer; 53. and a lead hole.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As described above, the conventional photovoltaic module usually achieves the effect of completely black appearance of the front surface by coating a black coating or attaching a black adhesive film on the front surface of the silver bus bar. However, in order to lead out the current generated by the cell string in the photovoltaic module to the outside of the photovoltaic module, a portion of the bus bar needs to be bent to form a lead-out wire perpendicular to the plane of the photovoltaic module, and the lead-out wire is used for being connected to a junction box on the back of the photovoltaic module to lead out the current generated by the cell string in the photovoltaic module to the outside of the photovoltaic module. However, in the lamination process of the photovoltaic module, white spots of the bus bars are prone to be poor at the bending positions, so that the photovoltaic module cannot achieve a completely black appearance. The reason for this is that: on one hand, in the process of laminating the photovoltaic module, the bus bar is subjected to a large pressure at the bending position, so that the black coating or the black adhesive film of the bus bar at the bending position is easy to fall off, and the silver tin layer of the bus bar at the bending position is exposed to form a poor white spot. On the other hand, in the process of laminating the photovoltaic module, the bending part of the bus bar can extrude away part of the adhesive film between the bus bar and the front glass, so that the phenomenon of adhesive shortage is caused, and further, the appearance of the front side of the photovoltaic module is poor in white spots.

Based on this, this application provides one kind can realize the photovoltaic module of positive outward appearance complete black. Specifically, referring to fig. 1 to 3, the photovoltaic module of an embodiment includes a first cell string 11, a second cell string 12, a first bus bar 20 and a second bus bar 30, wherein the first cell string 11 and the second cell string 12 are connected in series, the first bus bar 20 is disposed between the first cell string 11 and the second cell string 12 and is electrically connected to the first cell string 11 and the second cell string 12, the first bus bar 20 has a first surface 21 and a second surface 22 opposite to each other, preferably, the first bus bar 20 extends in a direction perpendicular to the direction in which the first cell string 11 and the second cell string 12 are connected in series, the first surface 21 of the first bus bar 20 faces the front side of the photovoltaic module and is parallel to the front side of the photovoltaic module, and the second surface 22 faces the back side of the photovoltaic module and is parallel to the back side of the photovoltaic module. The first surface 21 is covered with a black layer. One end of the second bus bar 30 is connected to the second surface 22, and the other end of the second bus bar 30 extends in a direction forming an angle with the second surface 22, and preferably, the other end of the second bus bar 30 extends in a direction perpendicular to the second surface 22.

The photovoltaic module is electrically connected to the first cell string 11 and the second cell string 12 through the first bus bar 20, so that the first bus bar 20 can collect the current of the first cell string 11 and the current of the second cell string 12. Meanwhile, the second bus bar 30 is connected to the second surface 22 of the first bus bar 20, and the second bus bar 30 extends along the direction forming an included angle with the second surface 22, so that the second bus bar 30 can be used as an outgoing line of the photovoltaic module to lead the current converged by the first bus bar 20 out of the photovoltaic module, the first bus bar 20 is prevented from being bent, the first bus bar 20 is ensured to be stressed uniformly in the lamination process of the photovoltaic module, the problem that a black layer on the first surface 21 falls off at the bent part due to bending of the first bus bar 20 is avoided, the phenomenon that the photovoltaic module lacks glue at the bent part of the first bus bar 20 is also avoided, the defect that white spots are poor in the front appearance of the photovoltaic module is further avoided, and the full black effect of the front appearance of the photovoltaic module is realized.

Further, the projection of the first bus bar 20 in the direction perpendicular to the back surface of the photovoltaic module covers the second bus bar 30, so as to ensure that the first bus bar 20 can completely cover the second bus bar 30 when viewed from the front surface of the photovoltaic module, and further ensure that the black layer covered on the first surface 21 can completely cover the first bus bar 20 and the second bus bar 30, and ensure that the front surface of the photovoltaic module is completely black in appearance.

Referring to fig. 3, the second bus bar 30 includes a connection portion 31 and a lead portion 32 disposed at an angle, the connection portion 31 is connected to the second surface 22, and the lead portion 32 extends in a direction at an angle to the second surface 22. Preferably, the connection portion 31 and the lead portion 32 are disposed vertically, that is, the second bus bar 30 has an "L" shape. The lead out portion 32 extends in a direction perpendicular to the second surface 22, i.e. the direction of extension of the lead out portion 32 is perpendicular to the back side of the photovoltaic module. Further, in the present embodiment, the connection portion 31 is weld-connected to the first bus bar 20. In other embodiments, the connection portion 31 and the first bus bar 20 may be adhesively connected by using a conductive adhesive.

Further, the connection portion 31 and the lead portion 32 are integrally formed by bending, and specifically, the second bus bar 30 may be connected to the second surface 22 of the first bus bar 20 first, and then bent to form the connection portion 31 and the lead portion 32. The second bus bar 30 may be bent into the connection portion 31 and the lead portion 32, and then the connection portion 31 is connected to the second surface 22 of the first bus bar 20, which is not limited herein. Preferably, the thickness of the first bus bar 20 is greater than or equal to the thickness of the second bus bar 30, so that the second bus bar 30 is more easily bent.

With continued reference to fig. 3, after the connection portion 31 is connected to the second surface 22, the side 321 of the lead-out portion 32 does not exceed the end surface 23 of the first bus bar 20 in the length direction of the first bus bar 20. Preferably, the distance from the side 321 of the lead-out portion 32 to the end surface 23 of the first bus bar 20 is 0-5mm, so as to ensure that the front appearance of the photovoltaic module is completely black.

Further, the width of the first bus bar 20 is greater than or equal to the width of the second bus bar 30, so as to ensure that after the second bus bar 30 is connected to the first bus bar 20, two sides of the second bus bar 30 in the width direction do not exceed two sides of the first bus bar 20 in the width direction, and further ensure that the front appearance of the photovoltaic module is completely black.

Specifically, in the present embodiment, the first bus bar 20 and the second bus bar 30 are made of a conductive material, for example, the first bus bar 20 and the second bus bar 30 are both copper bars, so as to ensure that the first bus bar 20 and the second bus bar 30 have good conductive performance. Further, the second surface 22 is covered with a first conductive layer. Preferably, the first conductive layer is a tin layer, and the tin layer covers the second surface 22 of the first bus bar 20, so that the corrosion resistance of the first bus bar 20 is improved while the conductive performance of the first bus bar 20 is ensured.

Further, at least one side surface of the second bus bar 30 is covered with a second conductive layer. Preferably, the entire surface of the second bus bar 30 is covered with the second conductive layer. Preferably, the second conductive layer is a tin layer, that is, the second bus bar 30 may be directly a conventional silver-colored tin-coated bus bar, so as to improve the corrosion resistance of the second bus bar 30 while ensuring the conductive performance of the second bus bar 30. Further, in the conventional solution of forming the lead-out wire by bending the bus bar, the black coating on the surface of the bus bar is not conductive, so that an operation of erasing the black coating at the lead-out wire is required before testing or connecting to the junction box, which affects the production efficiency. And the second busbar 30 of this application can directly adopt conventional silver to scribble the tin busbar, has saved the operation of erasing the black coating on the lead wire before the test or be connected to the terminal box, has saved the time cost, has improved production efficiency.

Referring to fig. 2, the photovoltaic module further includes a front plate 41 and a first adhesive film layer 42, the front plate 41 is disposed opposite to the first surface 21 and covers the first cell string 11 and the second cell string 12, and the front plate 41 is adhered to one side of the first cell string 11 and one side of the second cell string 12 through the first adhesive film layer 42. Further, the photovoltaic module further includes a back sheet 51 and a second adhesive film layer 52, the back sheet 51 is disposed opposite to the second surface 22 and covers the first cell string 11 and the second cell string 12, and the back sheet 51 is adhered to the other side of the first cell string 11 and the other side of the second cell string 12 through the second adhesive film layer 52.

One side of the first battery string 11 and one side of the second battery string 12 are covered by the front plate 41, and the other side of the first battery string 11 and the other side of the second battery string 12 are covered by the back plate 51, so that the internal parts of the photovoltaic module can be effectively protected from water and dust. Preferably, the material of the front plate 41 is a light-transmitting material, such as glass. The material of the back plate 51 may be glass or polymer, and is not limited herein.

Further, the back plate 51 is provided with a lead hole 53, and one end of the second bus bar 30 away from the first bus bar 20 penetrates through the lead hole 53, so that the second bus bar 30 can be connected to the junction box on the back of the photovoltaic module.

Referring to fig. 1 and 2, the photovoltaic module further includes a conductive member 13, the first cell string 11 and the second cell string 12 are connected in series through the conductive member 13, and the conductive member 13 is connected to the first bus bar 20. Preferably, each of the first battery string 11 and the second battery string 12 includes a plurality of battery cells, each of the battery cells is connected in series by a conductive member 13, and the second surface 22 of the first bus bar 20 is electrically connected to the conductive member 13 between the first battery string 11 and the second battery string 12. Preferably, the conductive member 13 is a welding wire, so as to facilitate welding to the battery cells and the first bus bar 20.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A photovoltaic module, comprising:

a first battery string (11) and a second battery string (12) which are connected;

a first bus bar (20), the first bus bar (20) being disposed between the first cell string (11) and the second cell string (12) and being electrically connected to the first cell string (11) and the second cell string (12), the first bus bar (20) having a first surface (21) and a second surface (22) disposed opposite to each other, the first surface (21) facing a front side of the photovoltaic module, the second surface (22) facing a back side of the photovoltaic module, the first surface (21) being covered with a black layer; and (c) a second step of,

a second bus bar (30), one end of the second bus bar (30) being connected to the second surface (22), the other end of the second bus bar (30) extending in a direction making an angle with the second surface (22).

2. Photovoltaic module according to claim 1, characterized in that the second busbar (30) comprises a connection portion (31) arranged at an angle and a lead-out portion (32), the connection portion (31) being connected to the second surface (22), the lead-out portion (32) extending in a direction arranged at an angle to the second surface (22).

3. The photovoltaic module according to claim 1, characterized in that the projection of the first busbar (20) on the back perpendicular to the photovoltaic module covers the second busbar (30).

4. Photovoltaic module according to claim 1, characterized in that the width of the first busbar (20) is greater than or equal to the width of the second busbar (30).

5. Photovoltaic module according to claim 1, characterized in that said second surface (22) is covered with a first conductive layer.

6. Photovoltaic module according to claim 1, characterized in that at least one side surface of the second busbar (30) is covered with a second conductive layer.

7. The photovoltaic module according to claim 1, further comprising a front sheet (41) and a first adhesive film layer (42), the front sheet (41) being arranged opposite to the first surface (21) and covering the first and second cell strings (11, 12), the front sheet (41) being bonded to the first and second cell strings (11, 12) by the first adhesive film layer (42).

8. The photovoltaic module according to claim 1, further comprising a back sheet (51) and a second adhesive film layer (52), wherein the back sheet (51) is disposed opposite to the second surface (22) and covers the first cell string (11) and the second cell string (12), and the back sheet (51) is adhered to the first cell string (11) and the second cell string (12) through the second adhesive film layer (52).

9. The photovoltaic module according to claim 8, wherein the back sheet (51) is provided with a lead hole (53), and an end of the second bus bar (30) far away from the first bus bar (20) penetrates through the lead hole (53).

10. The photovoltaic module according to claim 1, further comprising a conductive member (13), wherein the first cell string (11) and the second cell string (12) are electrically connected by the conductive member (13), and wherein the conductive member (13) is connected to the first bus bar (20).

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