Solar cell module

Abstract

The utility model relates to a solar cell module, which comprises a plurality of solar cells and a welding strip, and the plurality of solar cells are connected through the welding strip. A plurality of first grid lines distributed at intervals and a plurality of insulating protrusions are arranged on the surface of the solar cell piece. The insulating protrusions protrude out of the surface of the solar cell piece and are distributed at intervals in the first direction. The solder strip passes through the plurality of insulating protrusions along a first direction. In each solar cell piece, the number of the first grid lines distributed at intervals in the first direction is N1, the number of the first grid lines making contact with the insulating protrusions is N2, and N2 / N1 is smaller than or equal to 60%. And the first grid lines which are not in contact with the insulating bulges are electrically connected with the welding strip. According to the solar cell module provided by the invention, the effectiveness of electrical connection between the welding strip and the first grid line can be ensured while a good fixing effect of the insulating bulge on the welding strip can be realized.

Description

Technical Field

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

[0002] In traditional photovoltaic modules, since a large surface area of the cell is occupied by the main grid, the light-receiving area of the cell is significantly reduced, ultimately resulting in limited photoelectric conversion efficiency of the cell. Therefore, the industry has proposed a main-gridless cell, in which only sub-grid lines are provided on the front and back surfaces of the main-gridless cell. Compared with traditional cells, the main-gridless cell has a larger light-receiving area and a significantly improved photoelectric conversion efficiency.

[0003] In the main-gridless cell, one of the processes is to use glue to fix the solder ribbon on the surface of the cell, and then weld the solder ribbon to electrically connect the solder ribbon and the cell. When the solder ribbon is fixed by the glue, since the insulation of the glue will isolate the electrical connection between the solder ribbon and the grid line, it is necessary to balance the positional relationship between the glue dots and the grid line to simultaneously achieve a good fixing effect of the glue on the solder ribbon and the effectiveness of the electrical connection between the solder ribbon and the grid line during the welding process. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a solar cell module. The solar cell module of this application can achieve a good fixing effect of the glue on the solder ribbon and the effectiveness of the electrical connection between the solder ribbon and the grid line during the welding process.

[0005] This application provides a solar cell module, including a plurality of solar cells and solder ribbons, and the plurality of solar cells are connected by the solder ribbons;

[0006] A plurality of first grid lines and a plurality of insulating protrusions are provided on the surface of the solar cell; the insulating protrusions protrude from the surface of the solar cell, and the plurality of insulating protrusions are spaced apart along a first direction; the solder ribbon penetrates through the plurality of insulating protrusions along the first direction;

[0007] In each of the solar cells, the number of the first grid lines spaced apart in the first direction is N1, where the number of the first grid lines in contact with the insulating protrusions is N2, and N2 / N1≤60%; an electrical connection is formed between the first grid lines not in contact with the insulating protrusions and the solder ribbon.

[0008] In some embodiments, the length of the insulating protrusion in the first direction is less than the spacing between adjacent first grid lines.

[0009] In some embodiments, at least a part of the insulating protrusions is in contact with the first grid lines.

[0010] In some of these embodiments, each of the insulating protrusions is spaced apart from the first gate line.

[0011] In some of these embodiments, the width of the insulating protrusion in the first direction is greater than or equal to the spacing between two adjacent first gate lines.

[0012] In some of these embodiments, at least a portion of the insulating protrusions are in contact with multiple first gate lines.

[0013] In some of these embodiments, each of the insulating protrusions is in contact with only one first gate line.

[0014] In some of these embodiments, each of the first gate lines extends in a second direction, and the second direction intersects the first direction.

[0015] In some of these embodiments, multiple solder ribbons extending in the first direction are provided on each of the solar cell wafers; each of the solder ribbons is fixed to the solar cell wafer by a plurality of insulating protrusions spaced apart in the first direction.

[0016] In some of these embodiments, the solder ribbon includes a core layer, a coating layer, and a connection layer;

[0017] The coating layer covers the surface of the core layer, the connection layer is provided on the surface of the coating layer facing the solar cell wafer, and the connection layer forms an electrical connection with the first gate line that is not in contact with the insulating protrusion.

[0018] In some of these embodiments, a second gate line is further provided on the surface of the solar cell wafer, and each of the first gate lines is connected to the second gate line.

[0019] In some of these embodiments, the second gate line extends in the first direction, and the second gate line is provided between the solar cell wafer and the solder ribbon.

[0020] In the above-mentioned solar cell module, a first grid line, an insulating protrusion, and a solder ribbon are provided on the surface of the solar cell. The solder ribbon penetrates through a plurality of insulating protrusions in a first direction, that is, the insulating protrusions are wrapped around the periphery of the solder ribbon, and the solder ribbon can be fixed on the surface of the solar cell through the insulating protrusions. The insulation of the insulating protrusions will isolate the electrical connection between the solder ribbon and the first grid line, that is, the first grid line in contact with the insulating protrusion cannot achieve an electrical connection with the solder ribbon. Therefore, in the first direction, the number of the first grid lines is N1, and the number of the first grid lines in contact with the insulating protrusion is N2. It is controlled that N2 / N1≤60%, that is, it is controlled that the number of the first grid lines in contact with the insulating protrusion in the first direction ≤ 60% of the total number of the first grid lines in the first direction, and an electrical connection is formed through the solder ribbon and the first grid line not in contact with the insulating protrusion, which can ensure the effectiveness of the electrical connection between the solder ribbon and the first grid line. The solar cell module of the present application can achieve a good fixing effect of the insulating protrusion on the solder ribbon while ensuring the effectiveness of the electrical connection between the solder ribbon and the first grid line. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural view of a solar cell in a solar cell module provided by an embodiment of the present application;

[0022] Figure 2 It is a side view of a solar cell in a solar cell module provided by an embodiment of the present application;

[0023] Figure 3 It is a schematic structural view of a solar cell in a solar cell module provided by another embodiment of the present application;

[0024] Figure 4 It is a schematic structural view of a solar cell in a solar cell module provided by another embodiment of the present application;

[0025] Figure 5 It is a schematic structural view of a solar cell in a solar cell module provided by another embodiment of the present application;

[0026] Figure 6 It is a schematic partial structural view of a solar cell in a solar cell module provided by an embodiment of the present application.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS

[0028] 10. Solar cell; 20. First grid line; 30. Insulating protrusion; 40. Solder ribbon; 41. Core layer; 42. Coating layer; 43. Connecting layer; 50. Second grid line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0031] In the description of this application, it should be understood that the orientation or positional relationships indicated by 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. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this 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 thus should not be construed as a limitation of this application.

[0032] In addition, the terms "first" and "second" are used only 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 this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0033] In this application, unless otherwise clearly specified and limited, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of 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 this application can be understood according to specific circumstances.

[0034] Refer to Figures 1 to 2The present application provides a solar cell module, including a plurality of solar cell sheets 10 and a welding ribbon 40, wherein the plurality of solar cell sheets 10 are connected by the welding ribbon 40. A plurality of first grid lines 20 and a plurality of insulating protrusions 30 are arranged on the surface of the solar cell sheet 10. The insulating protrusions 30 protrude from the surface of the solar cell sheet 10, and the plurality of insulating protrusions 30 are spaced apart along a first direction. The welding ribbon 40 penetrates the plurality of insulating protrusions 30 along the first direction. In each solar cell sheet 10, the number of first grid lines 20 spaced apart in the first direction is N1, wherein the number of first grid lines 20 in contact with the insulating protrusions 30 is N2, and N2 / N1≤60%. An electrical connection is formed between the first grid lines 20 that are not in contact with the insulating protrusions 30 and the welding ribbon 40.

[0035] In the above solar cell assembly, the surface of the solar cell sheet 10 is provided with the first grid line 20, the insulating protrusion 30 and the welding strip 40. The welding strip 40 passes through the plurality of insulating protrusions 30 along the first direction, that is, the insulating protrusion 30 is wrapped around the outer periphery of the welding strip 40, and the welding strip 40 can be fixed on the surface of the solar cell sheet 10 through the insulating protrusion 30. Figure 1 As shown, exemplary, Figure 1 The X direction is the first direction. The insulation of the insulating protrusion 30 will isolate the electrical connection between the welding strip 40 and the first grid line 20, that is, the first grid line 20 in contact with the insulating protrusion 30 cannot achieve electrical connection with the welding strip 40. Therefore, in each solar cell sheet 10, in the first direction, the number of first grid lines 20 is N1, and the number of first grid lines 20 in contact with the insulating protrusion 30 is N2. N2 / N1 is controlled to be ≤60%, that is, the number of first grid lines 20 in contact with the insulating protrusion 30 in the first direction is controlled to be ≤60% of the total number of first grid lines 20 in the first direction, and an electrical connection is formed between the welding strip 40 and the first grid lines 20 that are not in contact with the insulating protrusion 30, so as to ensure the effectiveness of the electrical connection between the welding strip 40 and the first grid lines 20. It can be understood that the total number of the first grid lines 20 in contact with the insulating protrusion 30 plus the first grid lines 20 that form an electrical connection with the welding strip 40 is equal to N1. The solar cell module of the present application can achieve a good fixing effect of the insulating protrusion 30 on the welding ribbon 40 while ensuring the effectiveness of the electrical connection between the welding ribbon 40 and the first grid line 20 .

[0036] Optionally, N2 / N1 is 0-60%. Further optionally, N2 / N1 is 0, 2%, 4%, 5%, 6%, 8%, 10%, 12%, 15%, 18%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60%. Alternatively, N2 / N1 may also be within the range of any two of the above point values ​​as the end value process. Preferably, N2 / N1 is 0-30%. Further preferably, N2 / N1 is 0-10%.

[0037] In some of these embodiments, the length of the insulating protrusion 30 in the first direction is less than the spacing between two adjacent first grid lines 20.

[0038] The length of the insulating protrusion 30 in the first direction is less than the spacing between two adjacent first grid lines 20, that is, there is a relatively large spacing between two adjacent first grid lines 20. In this case, it is convenient to set the position of the insulating protrusion 30, and at the same time, it is convenient to achieve less coverage of the first grid lines 20 by the insulating protrusion 30.

[0039] Referring to Figure 3 As shown, in some of these embodiments, at least a part of the insulating protrusion 30 is in contact with the first grid line 20.

[0040] On the premise that the length of the insulating protrusion 30 in the first direction is less than the spacing between two adjacent first grid lines 20, controlling the number of first grid lines 20 in contact with the insulating protrusion 30 in the first direction ≤ 60% of the total number of first grid lines 20 in the first direction can also achieve a good fixing effect of the insulating protrusion 30 on the solder strip 40 while ensuring the effectiveness of the electrical connection between the solder strip 40 and the first grid line 20.

[0041] In some of these embodiments, each insulating protrusion 30 is arranged at an interval from the first grid line 20.

[0042] Referring again to Figure 1 As shown, on the premise that the width of the insulating protrusion 30 in the first direction is less than the spacing between two adjacent first grid lines 20, each insulating protrusion 30 can be arranged at an interval from the first grid line 20, that is, the number of first grid lines 20 in contact with the insulating protrusion 30 in the first direction can be controlled to be zero, thereby ensuring the effectiveness of the electrical connection between the solder strip 40 and the first grid line 20.

[0043] Referring to Figure 4 、 Figure 5 As shown, in some of these embodiments, the width of the insulating protrusion 30 in the first direction is greater than or equal to the spacing between adjacent first grid lines 20.

[0044] The width of the insulating protrusion 30 in the first direction is greater than or equal to the spacing between two adjacent first grid lines 20, that is, there is a relatively small spacing between adjacent first grid lines 20, that is, the arrangement of the first grid lines 20 is relatively dense. The relatively dense arrangement of the first grid lines 20 above can be used for arrangement on the back surface of the solar cell 10. In this case, controlling the number of first grid lines 20 in contact with the insulating protrusion 30 in the first direction ≤ 60% of the total number of first grid lines 20 in the first direction can also achieve ensuring a good fixing effect of the insulating protrusion 30 on the solder strip 40 and the effectiveness of the electrical connection between the solder strip 40 and the first grid line 20 at the same time.

[0045] In some of these embodiments, at least a portion of the insulating protrusions 30 are in contact with a plurality of first gate lines 20.

[0046] Referring again to Figure 4 as shown, it can be understood that at least a portion of the insulating protrusions 30 being in contact with a plurality of first gate lines 20 means that some of the insulating protrusions 30 are in contact with two or more first gate lines 20 simultaneously.

[0047] In some of these embodiments, each insulating protrusion 30 is in contact with only one first gate line 20.

[0048] Referring again to Figure 5 as shown, it can be understood that each insulating protrusion 30 being in contact with only one first gate line 20 means that each insulating protrusion 30 is in contact with only one of the first gate lines 20.

[0049] In some of these embodiments, each first gate line 20 extends along a second direction, and the second direction intersects the first direction.

[0050] Referring again to Figure 1 as shown, by way of example, Figure 1 Y in [the figure] is the second direction.

[0051] In some of these embodiments, the second direction is perpendicular to the first direction.

[0052] In some of these embodiments, along the first direction, the insulating protrusions 30 are equally spaced.

[0053] In some of these embodiments, a plurality of welding tapes 40 extending along the first direction are provided on each solar cell 10. Each welding tape 40 is fixed to the solar cell 10 by a plurality of insulating protrusions 30 spaced apart along the first direction.

[0054] In some of these embodiments, the welding tape 40 includes a core layer 41, a coating layer 42, and a connecting layer 43. The coating layer 42 covers the surface of the core layer 41, and the connecting layer 43 is provided on the surface of the coating layer 42 facing the solar cell 10. The connecting layer 43 forms an electrical connection with the first gate line 20 that is not in contact with the insulating protrusion 30.

[0055] In some of these embodiments, the core layer 41 is a copper core layer 41.

[0056] In some of these embodiments, the coating layer 42 is a tin coating layer 42.

[0057] In some of these embodiments, the connecting layer 43 is a tin connecting layer 43.

[0058] Referring to Figure 6As shown, in some of these embodiments, a second grid line 50 is further provided on the surface of the solar cell 10, and each first grid line 20 is connected to the second grid line 50.

[0059] It can be understood that the arrangement scheme among the above-mentioned solar cell module, the solder strip 40, the solar cell 10, the first grid line 20, and the insulating protrusion 30 can be applied not only to the main-gridless solar cell, but also to the traditional main-grid solar cell.

[0060] In some of these embodiments, the second grid line 50 extends in a first direction, and the second grid line 50 is provided between the solar cell 10 and the solder strip 40.

[0061] It should be noted that the second grid line 50 extending in the first direction may be that the second grid line 50 continuously penetrates the solar cell 10, or the second grid line 50 does not continuously penetrate the solar cell 10, or in the first direction, there are local dot-like or line-like second grid lines 50.

[0062] In some of these embodiments, the solar cell 10 and the solder strip 40 form a solar cell string, and the solar cell module further includes a front adhesive film and a front photovoltaic glass stacked on the front of the solar cell string, and a back adhesive film and a back photovoltaic glass stacked on the back of the solar cell string.

[0063] 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.

[0064] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be understood as a limitation of the patent scope. 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 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, and the description and the drawings can be used to explain the content of the claims.

Claims

1. A solar cell assembly, characterized in that: Comprising a plurality of solar cell sheets (10) and a welding strip (40), wherein the plurality of solar cell sheets (10) are connected via the welding strip (40); A plurality of first grid lines (20) and a plurality of insulating protrusions (30) are arranged on the surface of the solar cell sheet (10); the insulating protrusions (30) protrude from the surface of the solar cell sheet (10), and the plurality of insulating protrusions (30) are distributed at intervals along a first direction; the welding strip (40) passes through the plurality of insulating protrusions (30) along the first direction; In each of the solar cell sheets (10), the number of the first grid lines (20) spaced apart in the first direction is N1, wherein the number of the first grid lines (20) in contact with the insulating protrusions (30) is N2, and N2 / N1≤60%; an electrical connection is formed between the first grid lines (20) not in contact with the insulating protrusions (30) and the welding strips (40).

2. The solar cell assembly according to claim 1, characterized in that: The length of the insulating protrusion (30) in the first direction is smaller than the distance between two adjacent first gate lines (20).

3. The solar cell assembly according to claim 2, characterized in that: At least part of the insulating protrusion (30) is in contact with the first gate line (20); or, Each of the insulating protrusions (30) is arranged at a distance from the first gate line (20).

4. The solar cell assembly according to claim 1, characterized in that: The width of the insulating protrusion (30) in the first direction is greater than or equal to the interval between two adjacent first gate lines (20).

5. The solar cell assembly according to claim 4, characterized in that: At least part of the insulating protrusions (30) are in contact with a plurality of the first gate lines (20); or, Each of the insulating protrusions (30) is in contact with only one of the first gate lines (20).

6. The solar cell assembly according to any one of claims 1 to 5, characterized in that: Each of the first grid lines (20) extends along a second direction, and the second direction intersects with the first direction.

7. The solar cell assembly according to any one of claims 1 to 5, characterized in that: Each of the solar cell sheets (10) is provided with a plurality of welding strips (40) extending along the first direction; each of the welding strips (40) is fixed to the solar cell sheet (10) via a plurality of insulating protrusions (30) spaced apart along the first direction.

8. The solar cell assembly according to any one of claims 1 to 5, characterized in that: The welding strip (40) comprises a core layer (41), a cladding layer (42) and a connecting layer (43); The coating layer (42) is coated on the surface of the core layer (41), the connection layer (43) is arranged on the surface of the coating layer (42) on a side facing the solar cell sheet (10), and the connection layer (43) forms an electrical connection with the first grid line (20) that is not in contact with the insulating protrusion (30).

9. The solar cell assembly according to any one of claims 1 to 5, characterized in that: A second grid line (50) is also provided on the surface of the solar cell sheet (10), and each of the first grid lines (20) is connected to the second grid line (50).

10. The solar cell assembly according to claim 9, characterized in that: The second grid line (50) extends along the first direction, and the second grid line (50) is arranged between the solar cell sheet (10) and the welding strip (40).

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