Solar cell module
By adopting the design of main gateless cell cells and optimized welding connection layers in solar cell modules, the problems of reduced light receiving area and low photoelectric conversion efficiency of traditional photovoltaic modules are solved, and higher photoelectric conversion efficiency is achieved.
Patent Information
- Application Number
- CN202421805381.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In traditional photovoltaic modules, since the surface area of the cell is occupied by the main gate, the light-receiving area is reduced and the photoelectric conversion efficiency is limited.
A solar cell module is designed to adopt a main gateless cell, and an electrical connection is formed with the secondary gate line through the connecting layer of the welding tape, ensuring that the welding-formed connecting layer has less obstruction on the surface of the cell.
The large light receiving area of the battery is achieved, thereby improving the photoelectric conversion efficiency.
Smart Images
Figure CN222996963U_ABST
Abstract
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, and only auxiliary 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 the photoelectric conversion efficiency has been significantly improved.
[0003] During the welding process of traditional cells, the solder tape forms an electrical connection with the PAD points on the main grid. In the main-gridless cell, during the welding process of the solder tape, the tin layer melts to form a connection layer, and the solder tape directly forms an electrical connection with the auxiliary grid line through the connection layer. However, in traditional cells, due to the wettability of the tin layer, the connection layer formed by welding still blocks a large area of the cell surface, thereby affecting the photoelectric conversion efficiency of the cell. Summary of the Utility Model
[0004] Based on this, it is necessary to provide a solar cell module. In the solar cell module of this application, the solder tape has a small blockage of the surface of the solar cell, can achieve a large light-receiving area of the cell, and thus achieve a high photoelectric conversion efficiency.
[0005] This application provides a solar cell module, including a plurality of solar cells and solder tapes, and the plurality of solar cells are connected by the solder tapes; a plurality of first grid lines are arranged on the surface of the solar cell;
[0006] The solder tape extends along a first direction, and the solder tape includes a core layer, a coating layer, and a connection layer; the coating layer is coated on the surface of the core layer, the connection layer is arranged on the surface of the coating layer facing the solar cell, and the connection layer forms an electrical connection with the first grid line;
[0007] The maximum width of the connection layer is less than or equal to the maximum width of the coating layer.
[0008] In some embodiments, the core layer is cylindrical, and the axis of the core layer extends along the first direction.
[0009] In some embodiments, the connection layer includes a first connection portion and a second connection portion, and the first connection portion and the second connection portion are respectively located on both sides of the projection of the axis of the core layer on the surface of the solar cell;
[0010] The maximum width of the first connection portion is less than or equal to half of the maximum width of the coating layer;
[0011] The maximum width of the second connection portion is less than or equal to half of the maximum width of the coating layer.
[0012] In some embodiments, the projection of the coating layer on the surface of the solar cell covers the projection of the connection layer on the surface of the solar cell.
[0013] In some embodiments, the first grid line includes a grid line body portion and a widened portion. The widened portion connects the connection layer and the grid line body portion, and an electrical connection is formed between the connection layer and the widened portion;
[0014] The maximum width of the widened portion in the first direction is greater than the maximum width of the grid line body portion in the first direction.
[0015] In some embodiments, the maximum width of the widened portion in the first direction is less than or equal to three times the maximum width of the grid line body portion in the first direction.
[0016] In some embodiments, the first grid line further includes a transition portion. The transition portion connects the grid line body portion and the widened portion, and the width of the transition portion in the first direction gradually increases from the grid line body portion to the widened portion.
[0017] In some embodiments, each of the first grid lines extends along a second direction, and the second direction intersects the first direction.
[0018] In some embodiments, a second grid line is further provided on the surface of the solar cell, and each of the first grid lines is connected to the second grid line.
[0019] In some embodiments, the second grid line extends along the first direction, and the second grid line is provided between the solar cell and the solder strip.
[0020] In the above solar cell module, a first grid line is provided on the surface of the solar cell. The solder strip includes a core layer, a coating layer, and a connection layer; the coating layer covers the surface of the core layer, and the connection layer is provided on the surface of the coating layer facing the solar cell. An electrical connection is formed between the connection layer and the first grid line. The maximum width of the connection layer being less than or equal to the maximum width of the coating layer can result in less shielding of the surface of the solar cell by the connection layer formed during welding, enabling a larger light-receiving area of the cell and thus achieving a higher photoelectric conversion efficiency. Description of the Drawings
[0021] Figure 1 Side view of a solar cell in a solar cell module provided by an embodiment of the present application;
[0022] Figure 2 Schematic structural diagram of a solar cell in a solar cell module provided by an embodiment of the present application;
[0023] Figure 3 Schematic structural diagram of a partially enlarged solar cell in a solar cell module provided by another embodiment of the present application.
[0024] Description of reference numerals
[0025] 10. Solar cell; 20. First grid line; 21. Grid line body part; 22. Widened part; 23. Transition part; 30. Welding strip; 31. Core layer; 32. Cladding layer; 33. Connection layer; 331. First connection part; 332. Second connection part; 40. Second grid line. Detailed implementation manners
[0026] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0028] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 therefore should not be construed as a limitation of this application.
[0029] In addition, the terms "first" and "second" are used for descriptive purposes only 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 such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0030] In this application, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed 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 this application can be understood according to specific circumstances.
[0031] Referring to Figure 1 and Figure 2 As shown, an embodiment of this application provides a solar cell module, which includes a plurality of solar cells 10 and welding tapes 30. The plurality of solar cells 10 are connected by the welding tapes 30. A plurality of first grid lines 20 are arranged on the surface of the solar cell 10 at intervals. The welding tape 30 extends in a first direction. The welding tape 30 includes a core layer 31, a coating layer 32, and a connection layer 33. The coating layer 32 covers the surface of the core layer 31. The connection layer 33 is arranged on the surface of the coating layer 32 facing the solar cell 10. The connection layer 33 and the first grid line 20 form an electrical connection. The maximum width of the connection layer 33 is less than or equal to the maximum width of the coating layer 32.
[0032] In the above solar cell module, the first grid lines 20 are arranged on the surface of the solar cell 10, and the welding tape 30 includes a core layer 31, a coating layer 32, and a connection layer 33. The coating layer 32 covers the surface of the core layer 31. The connection layer 33 is arranged on the surface of the coating layer 32 facing the solar cell 10. The connection layer 33 and the first grid line 20 form an electrical connection. The maximum width of the connection layer 33 being less than or equal to the maximum width of the coating layer 32 can make the connection layer 33 formed by welding have less shielding of the surface of the solar cell 10, can achieve a larger light-receiving area of the cell, and thus achieve a higher photoelectric conversion efficiency.
[0033] Exemplarily, referring to Figure 2 as shown, Figure 2The X direction therein is the first direction. It can be understood that the maximum width of the connection layer 33 refers to the maximum width of the connection layer 33 in the direction perpendicular to the first direction, and the maximum width of the coating layer 32 refers to the maximum width of the coating layer 32 in the direction perpendicular to the first direction. Exemplarily, referring to Figure 1 as shown, Figure 1 in which S1 is the maximum width of the connection layer 33, Figure 1 and in which S2 is the maximum width of the coating layer 32.
[0034] It should be noted that by selecting a suitable solder strip 40, it is convenient to make the maximum width of the connection layer 33 after welding less than or equal to the maximum width of the coating layer 32. Optionally, in the solder strip 40 before welding, the difference between the maximum width of the coating layer 32 and the maximum width of the core layer 31 is less than or equal to 15 μm. Further optionally, in the solder strip 40 before welding, the difference between the maximum width of the coating layer 32 and the maximum width of the core layer 31 is 2 μm to 15 μm. Within the range of the difference between the maximum width of the coating layer 32 and the maximum width of the core layer 31 in the solder strip 40 before welding, it is convenient to make the maximum width of the connection layer 33 after welding less than or equal to the maximum width of the coating layer 32, and at the same time, a good welding effect can be achieved to ensure the reliability of the electrical connection. Further optionally, in the solder strip 40 before welding, the difference between the maximum width of the coating layer 32 and the maximum width of the core layer 31 is 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm or 15 μm. Alternatively, in the solder strip 40 before welding, the difference between the maximum width of the coating layer 32 and the maximum width of the core layer 31 can also be within the range between any two of the above differences.
[0035] In some embodiments, the core layer 31 is cylindrical, and the axis of the core layer 31 extends along the first direction.
[0036] In some embodiments, the connection layer 33 includes a first connection portion 331 and a second connection portion 332, and the first connection portion 331 and the second connection portion 332 are respectively located on both sides of the projection of the axis of the core layer 31 on the surface of the solar cell 10. The maximum width of the first connection portion 331 is less than or equal to half of the maximum width of the coating layer 32. The maximum width of the second connection portion 332 is less than or equal to half of the maximum width of the coating layer 32.
[0037] Referring again to Figure 1 as shown, it can be understood that the projection of the axis of the core layer 31 on the surface of the solar cell 10 is the core layer 31 along Figure 1The projection of the dotted line direction passing through the core layer 31 on the surface of the solar cell 10. The first connecting portion 331 and the second connecting portion 332 are two parts of the connecting layer 33 located on both sides of the above-mentioned dotted line respectively. It can be understood that the maximum width of the first connecting portion 331 refers to the maximum width of the first connecting portion 331 in the direction perpendicular to the first direction, and the maximum width of the second connecting portion 332 refers to the maximum width of the second connecting portion 332 in the direction perpendicular to the first direction. Exemplarily, Figure 1 where S3 in it is the maximum width of the first connecting portion 331, Figure 1 where S4 in it is the maximum width of the second connecting portion 332. The maximum width of the first connecting portion 331 is less than or equal to half of the maximum width of the coating layer 32, that is, S3 is less than or equal to half of S2, which can make the connecting layer 33 have less blockage of the surface of the solar cell 10, can achieve a larger light-receiving area of the cell, and thus achieve a higher photoelectric conversion efficiency. The maximum width of the second connecting portion 332 is less than or equal to half of the maximum width of the coating layer 32, that is, S4 is less than or equal to half of S2, which can make the connecting layer 33 have less blockage of the surface of the solar cell 10, can achieve a larger light-receiving area of the cell, and thus achieve a higher photoelectric conversion efficiency.
[0038] In some embodiments, the projection of the coating layer 32 on the surface of the solar cell 10 covers the projection of the connecting layer 33 on the surface of the solar cell 10.
[0039] The projection of the coating layer 32 on the surface of the solar cell 10 covering the projection of the connecting layer 33 on the surface of the solar cell 10 means that the width of the connecting layer 33 at any position is less than or equal to the width of the coating layer 32, so that the connecting layer 33 can have less blockage of the surface of the solar cell 10, can achieve a larger light-receiving area of the photovoltaic module, and thus achieve a higher photoelectric conversion efficiency.
[0040] In some embodiments, the core layer 31 is a copper core layer 31.
[0041] In some embodiments, the coating layer 32 is a tin coating layer 32.
[0042] In some embodiments, the connecting layer 33 is a tin connecting layer 33.
[0043] Referring to Figure 3 as shown, in some embodiments, the first grid line 20 includes a grid line body portion 21 and a widened portion 22. The widened portion 22 connects the connecting layer 33 and the grid line body portion 21, and the connecting layer 33 and the widened portion 22 form an electrical connection. The maximum width of the widened portion 22 in the first direction is greater than the maximum width of the grid line body portion 21 in the first direction.
[0044] Exemplarily, Figure 3S5 is the maximum width of the widened portion 22 in the first direction. Figure 3 S6 is the maximum width of the gate line body 21 in the first direction. It is understandable that, since the first gate line 20 usually has a relatively thin width, the widening portion 22 is provided on the side where the first gate line 20 is connected to the connection layer 33, so that the first gate line 20 can be in contact with the welding strip 30 through a relatively wide width, i.e., a relatively large contact area, and the risk of the welding strip 30 breaking the first gate line 20 during welding can be reduced.
[0045] In some embodiments, the maximum width of the widened portion 22 in the first direction is less than or equal to three times the maximum width of the gate line body portion 21 in the first direction.
[0046] It can be understood that the widened portion 22 has a larger shielding area than the gate line main body 21. At the same time, due to the wettability of the molten tin during the welding process, the widened portion 22 with a larger area is also likely to cause the maximum width of the formed connecting layer 33 to be larger. Therefore, within the range of the maximum width of the widened portion 22, it is possible to simultaneously achieve the risk of reducing the risk of the welding ribbon 30 breaking the first gate line 20 during the welding process, and the effect of reducing the shielding area of the widened portion 22 and the connecting layer 33 on the battery cell.
[0047] Optionally, the maximum width of the widened portion 22 in the first direction is 101% to 300% of the maximum width of the grid line body portion 21 in the first direction. Further optionally, the maximum width of the widened portion 22 in the first direction is 101%, 102%, 105%, 110%, 120%, 130%, 150%, 180%, 200%, 210%, 220%, 230%, 250%, 260%, 280% or 300% of the maximum width of the grid line body portion 21 in the first direction. Alternatively, the maximum width of the widened portion 22 in the first direction accounts for a percentage of the maximum width of the grid line body portion 21 in the first direction, which can also be within the range between any two of the above-mentioned point values.
[0048] In some embodiments, the first gate line 20 further includes a transition portion 23 , which connects the gate line body 21 and the widened portion 22 , and the width of the transition portion 23 in the first direction gradually increases from the gate line body 21 to the widened portion 22 .
[0049] In some embodiments, each first gate line 20 extends along the second direction, and the second direction intersects the first direction.
[0050] Refer again Figure 2 As shown, exemplary, Figure 2Among them, Y is the second direction. The maximum width of the widened portion 22 is the maximum width of the widened portion 22 in the second direction, and the maximum width of the portion of the first grid line 20 without the widened portion 22 is the maximum width of the portion of the first grid line 20 without the widened portion 22 in the second direction.
[0051] In some embodiments, the second direction is perpendicular to the first direction.
[0052] In some embodiments, a plurality of solder tapes 40 extending along the first direction are provided on each solar cell 10.
[0053] In some embodiments, a second grid line 40 is further provided on the surface of the solar cell 10, and each first grid line 20 is connected to the second grid line 40.
[0054] It can be understood that in the above-mentioned solar cell module, the setting scheme among the solder tape 30, the solar cell 10 and the first grid line 20 can not only be applied to the main-gridless solar cell, but also be applied to the traditional main-grid solar cell.
[0055] In some embodiments, the second grid line 40 extends along the first direction, and the second grid line 40 is provided between the solar cell 10 and the solder tape 30.
[0056] It should be noted that the second grid line 40 extending along the first direction may be that the second grid line 40 continuously penetrates the solar cell 10, or the second grid line 40 does not continuously penetrate the solar cell 10, or in the first direction, there are local dot-shaped or linear second grid lines 40.
[0057] In some embodiments, the solar cell 10 and the solder tape 30 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.
[0058] 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.
[0059] 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. 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, 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 welding strips (30), wherein the plurality of solar cell sheets (10) are connected via the welding strips (30); a plurality of first grid lines (20) distributed at intervals are arranged on the surface of the solar cell sheet (10); The welding ribbon (30) extends along a first direction, and the welding ribbon (30) comprises a core layer (31), a cladding layer (32), and a connecting layer (33); the cladding layer (32) is coated on a surface of the core layer (31), the connecting layer (33) is arranged on a surface of the cladding layer (32) facing the solar cell sheet (10), and the connecting layer (33) and the first grid line (20) are electrically connected; The maximum width of the connecting layer (33) is less than or equal to the maximum width of the covering layer (32).
2. The solar cell assembly according to claim 1, characterized in that: The core layer (31) is cylindrical, and the axis of the core layer (31) extends along the first direction.
3. The solar cell assembly according to claim 2, characterized in that: The connection layer (33) comprises a first connection portion (331) and a second connection portion (332), wherein the first connection portion (331) and the second connection portion (332) are respectively located on two sides of a projection of an axis of the core layer (31) on the surface of the solar cell sheet (10); The maximum width of the first connecting portion (331) is less than or equal to half the maximum width of the coating layer (32); The maximum width of the second connecting portion (332) is less than or equal to half the maximum width of the coating layer (32).
4. The solar cell assembly according to claim 1, characterized in that: The projection of the coating layer (32) on the surface of the solar cell sheet (10) covers the projection of the connecting layer (33) on the surface of the solar cell sheet (10).
5. The solar cell assembly according to claim 1, characterized in that: The first gate line (20) comprises a gate line body portion (21) and a widened portion (22), the widened portion (22) connecting the connection layer (33) and the gate line body portion (21), and the connection layer (33) and the widened portion (22) forming an electrical connection; The maximum width of the widened portion (22) in the first direction is greater than the maximum width of the gate line body portion (21) in the first direction.
6. The solar cell assembly according to claim 5, characterized in that: The maximum width of the widened portion (22) in the first direction is less than or equal to three times the maximum width of the gate line body portion (21) in the first direction.
7. The solar cell assembly according to claim 5, characterized in that: The first gate line (20) further comprises a transition portion (23), wherein the transition portion (23) connects the gate line main portion (21) and the widened portion (22), and the width of the transition portion (23) in the first direction gradually increases from the gate line main portion (21) to the widened portion (22).
8. The solar cell assembly according to any one of claims 1 to 7, characterized in that: Each of the first grid lines (20) extends along a second direction, and the second direction intersects with the first direction.
9. The solar cell assembly according to any one of claims 1 to 7, characterized in that: A second grid line (40) 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 (40).
10. The solar cell assembly according to claim 9, characterized in that: The second grid line (40) extends along the first direction, and the second grid line (40) is arranged between the solar cell sheet (10) and the welding strip (30).