Solar cell and photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, and provides a solar cell and a photovoltaic assembly, the solar cell comprises a cell substrate, the surface of the cell substrate is divided into a first area and second areas located at two sides of the first area; the first welding strip is arranged on the first area; the second welding strip is arranged on the second area; the number of the glue points is multiple, the first welding strip and the second welding strip are adhered to the battery substrate through the glue points, and the number of the glue points adhered to the single second welding strip is larger than that of the glue points adhered to the single first welding strip. By increasing the number of the glue points of the second welding strip on the second area, lamination deviation of the edge welding strip is effectively avoided, and the yield and the photoelectric conversion efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and particularly to a solar cell and a photovoltaic module. Background Art

[0002] A solar cell is a device that converts solar energy into electrical energy. Multiple electrode grid lines are printed on the solar cell to collect the current generated after the cell is irradiated by sunlight. Usually, multiple solar cells are electrically connected by solder tapes to improve the output power. In some traditional technologies, the solder tape and the solar cell are adhesively fixed through glue dots, and then an encapsulation glue film is set and laminated to form a photovoltaic module. However, during the lamination process, the encapsulation glue film is heated and has fluidity, and the solder tape located at the edge of the solar cell is easily affected by the flow of the encapsulation glue film and shifted, resulting in a white exposed phenomenon on the appearance of the solar cell, and further causing virtual soldering between the solder tape and the solar cell and power reduction. Summary of the Utility Model

[0003] Based on this, an embodiment of the present application provides a solar cell and a photovoltaic module with no offset of the edge solder tape.

[0004] In a first aspect, the present application provides a solar cell, comprising:

[0005] A cell substrate, the surface of the cell substrate is divided into a first region and second regions located on both sides of the first region;

[0006] A first solder tape, the first solder tape is disposed on the first region;

[0007] A second solder tape, the second solder tape is disposed on the second region;

[0008] Glue dots, there are multiple glue dots, both the first solder tape and the second solder tape are adhered to the cell substrate through the glue dots, and the number of the glue dots attached to a single second solder tape is more than the number of the glue dots attached to a single first solder tape.

[0009] In some embodiments, the number of the second solder tapes disposed on each second region is 1 to 4.

[0010] In some embodiments, the ratio of the number of the glue dots attached to a single second solder tape to the number of the glue dots attached to a single first solder tape is 1 to 16.

[0011] In some embodiments, the number of the glue dots attached to a single first solder tape is 1 to 15.

[0012] In some embodiments, the number of the glue dots attached to a single second solder strip is from 1 to 16.

[0013] In some embodiments, the number of the second solder strips on each of the second regions is ≥ 2. For two adjacent second solder strips on the second region, the number of the glue dots attached to the second solder strip farther from the first region is greater than the number of the glue dots attached to the second solder strip closer to the first region.

[0014] In some embodiments, a plurality of the glue dots are attached to each of the first solder strips, and the plurality of the glue dots attached to two adjacent first solder strips are arranged in a staggered manner in a direction perpendicular to the first solder strip; and / or,

[0015] A plurality of the glue dots are attached to each of the second solder strips, and the plurality of the glue dots attached to two adjacent second solder strips are arranged in a staggered manner in a direction perpendicular to the second solder strip.

[0016] In some embodiments, the height of the glue dot is 100 μm to 200 μm; and / or,

[0017] The width of the glue dot is 1.0 mm to 2.0 mm.

[0018] In a second aspect, the present application provides a photovoltaic module, and the photovoltaic module includes a plurality of solar cells as described in the first aspect.

[0019] In some embodiments, the photovoltaic module further includes a panel layer, a first encapsulation layer, a second encapsulation layer, and a backplane layer. The first encapsulation layer and the panel layer are sequentially stacked on one side surface of the solar cell in a direction away from the solar cell; the second encapsulation layer and the backplane layer are sequentially stacked on the other side surface of the solar cell facing away from the panel layer in a direction away from the solar cell.

[0020] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0021] By increasing the number of the glue dots on the second solder strips of the solar cell in the second region, the present application improves the stability of the second solder strips located on the outside, can effectively avoid the solder strip offset caused by the flow of the glue film during the lamination process, further avoid the phenomenon of the solar cell showing white, and reduce the virtual connection problem of the photovoltaic module, improve the product yield and the photoelectric conversion efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a solar cell provided in an embodiment of the present utility model;

[0023] Figure 2This is a schematic structural diagram of a photovoltaic module provided in an embodiment of the present invention.

[0024] Among them, 100 - solar cell; 110 - cell substrate; 111 - first region; 112 - second region; 120 - first solder strip; 130 - second solder strip; 140 - adhesive point; 200 - panel layer; 300 - first encapsulation layer; 400 - second encapsulation layer; 500 - backplane layer. Detailed implementation manners

[0025] The following will further describe the present invention in detail with reference to the drawings, implementation manners and embodiments. These implementation manners and embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The purpose of providing these implementation manners and embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. It should also be understood that the present invention can be implemented in many different forms and is not limited to the implementation manners and embodiments described herein. Those skilled in the art can make various changes or modifications without departing from the connotation of the present invention, and the equivalent forms obtained also fall within the protection scope of the present invention. In addition, in the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. It should be understood that the present invention can be implemented without one or more of these details.

[0026] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 to the present invention.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected to", "fixed" and "arranged" 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. For those of ordinary skill in the art, the meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, "optionally", "optional", "option" mean having or not having, that is, any one selected from two parallel options of "having" or "not having". If "optional" appears in a technical solution in multiple places, unless otherwise specified and without contradiction or mutual restriction relationship, each "optional" is independent of each other.

[0029] In the present utility model, among the technical features described in an open-ended manner, it includes a closed technical solution composed of the listed features, and also includes an open-ended technical solution containing the listed features.

[0030] In the present utility model, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or quantity, nor can it be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive listing and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0031] All documents mentioned in the present utility model are cited as references in the present utility model, just as if each document is cited separately as a reference. Unless it conflicts with the utility model purpose and / or technical solution of the present utility model, otherwise, the cited documents involved in the present utility model are cited in their entirety and for all purposes. When the present utility model involves cited documents, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited together. When the present utility model involves cited documents, the examples and preferred methods of the relevant technical features cited can also be incorporated as references into the present utility model, but only to the extent that the present utility model can be implemented. It should be understood that when the cited content conflicts with the description in the present utility model, the present utility model shall prevail or be modified adaptively according to the description of the present utility model.

[0032] In the traditional technology, the welding tape is fixed on the battery cell by using glue dots, and then encapsulating glue is set for lamination. However, during the lamination process, due to the large fluidity of the glue liquid at the edge, the welding tape located at the edge is likely to shift, resulting in the appearance of the battery cell showing white and the welding tape having a poor connection.

[0033] Based on this, in the first aspect of the present application, a solar cell is provided, as Figure 1 shown, the solar cell 100 includes:

[0034] A battery substrate 110, the surface of the battery substrate 110 is divided into a first region 111 and second regions 112 located on both sides of the first region 111.

[0035] A first welding tape 120, the first welding tape 120 is disposed on the first region 111.

[0036] A second welding tape 130, the second welding tape 130 is disposed on the second region 112.

[0037] Glue dots (140), there are multiple glue dots (140), both the first welding tape 120 and the second welding tape 130 are adhered to the battery substrate 110 through the glue dots 140, and the number of glue dots 140 attached to a single second welding tape 130 is more than the number of glue dots 140 attached to a single first welding tape 120.

[0038] By increasing the number of glue dots 140 of the second solder tape 130 in the second region 112 of the solar cell 100, the stability of the second solder tape 130 located on the outside is improved, which can effectively avoid the deviation of the second solder tape 130 caused by the flow of the glue film during the lamination process, thereby avoiding the phenomenon of white exposure of the solar cell 100, reducing the virtual connection problem of the photovoltaic module, improving the product yield and the photoelectric conversion efficiency of the photovoltaic module.

[0039] It can be understood that the number of glue dots 140 attached to each first solder tape 120 can be the same or different. The number of glue dots 140 attached to each second solder tape 130 can be the same or different.

[0040] In some embodiments, the battery substrate 110 can be a silicon battery substrate. For example, it can be an HJT battery substrate, a TOPcon battery substrate or a PERC battery substrate.

[0041] In some embodiments, the structures of the first solder tape 120 and the second solder tape 130 can respectively include a metal substrate and a solder layer coated on the surface of the metal substrate. It can be understood that the present utility model does not make specific requirements and special limitations on the materials of the metal substrate and the solder layer, and conventional materials in the art can be selected. For example, the material of the metal substrate can be copper, which can meet the requirements of precise dimensions, good electrical conductivity and certain strength. For example, the material of the solder layer can be a tin-lead alloy, such as the mass composition of the tin-lead alloy is 63% Sn and 37% Pb, or 60% Sn and 40% Pb.

[0042] In some embodiments, the material of the glue dot 140 can be an ultraviolet curable glue.

[0043] In some embodiments, the number of second solder tapes 130 provided on each second region 112 is 1 to 4. By selecting the number of second solder tapes 130 on the second region 112 as above, it is effectively ensured that the second solder tape 130 does not deviate during the lamination process.

[0044] In some embodiments, the ratio of the number of glue dots 140 attached to a single second solder tape 130 to the number of glue dots 140 attached to a single first solder tape 120 is 1 to 16, including but not limited to: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16.

[0045] In some embodiments, the number of glue dots 140 attached to a single first solder strip 120 is from 1 to 15, including but not limited to: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15. It can be understood that the number of glue dots 140 attached to each first solder strip 120 can be the same or different.

[0046] In some embodiments, the number of glue dots 140 attached to a single second solder strip 130 is from 1 to 16, including but not limited to: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16. It can be understood that the number of glue dots 140 attached to each second solder strip 130 can be the same or different.

[0047] By selecting the number of glue dots 140 attached to the first solder strip 120 and the number of glue dots 140 attached to the second solder strip 130 as above in this application, the stability of the second solder strip 130 during the lamination process is effectively ensured, and the offset of the outer solder strip during the lamination process is avoided.

[0048] In some embodiments, the glue dots 140 can be arranged at equal intervals or at any intervals along the length direction of the first solder strip 120.

[0049] In some embodiments, the glue dots 140 can be arranged at equal intervals or at any intervals along the length direction of the second solder strip 130.

[0050] Optionally, on a single first solder strip 120 or a single second solder strip 130, the number of glue dots 140 per unit length is greater in the edge portion closer to the battery substrate 110.

[0051] In some embodiments, the number of second solder strips 130 on each second region 112 is ≥ 2. For two adjacent second solder strips 130 on the second region 112, the number of glue dots 140 attached to the second solder strip 130 farther from the first region 111 is greater than the number of glue dots 140 attached to the second solder strip 130 closer to the first region 111. That is, on the second region 112, the number of glue dots 140 attached to the second solder strip 130 farther from the first region 111 is greater.

[0052] In some embodiments, multiple glue dots 140 are attached to each first solder strip 120, and the multiple glue dots 140 attached to two adjacent first solder strips 120 are arranged in a staggered manner in the direction perpendicular to the first solder strip 120.

[0053] In some embodiments, a plurality of glue dots 140 are attached to each second solder strip 130, and the plurality of glue dots 140 attached to two adjacent second solder strips 130 are arranged in a staggered manner in a direction perpendicular to the second solder strip 130.

[0054] In some embodiments, the height of the glue dot 140 is 100 μm to 200 μm, including but not limited to: 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm.

[0055] In some embodiments, the width of the glue dot 140 is 1.0 mm to 2.0 mm, including but not limited to: 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm.

[0056] It can be understood that the lengths, widths and spacing distances of the first solder strip 120 and the second solder strip 130 in the present application can be adjusted according to the actual size of the solar cell.

[0057] The second aspect of the present application provides a photovoltaic module, as Figure 2 shown, the photovoltaic module includes a plurality of solar cells 100 as in the first aspect.

[0058] In some embodiments, the photovoltaic module further includes a panel layer 200, a first encapsulation layer 300, a second encapsulation layer 400 and a backplane layer 500. The first encapsulation layer 300 and the panel layer 200 are stacked in sequence on one side surface of the solar cell 100 in a direction away from the solar cell 100; the second encapsulation layer 400 and the backplane layer 500 are stacked in sequence on the side surface of the solar cell 100 facing away from the panel layer 200 in a direction away from the solar cell 100.

[0059] In some embodiments, the panel layer 200 is located on the front side of the solar cell 100, and the backplane layer 500 is located on the back side of the solar cell 100. It should be noted that the front side refers to the side directly irradiated by sunlight; correspondingly, the back side refers to the side facing away from the sunlight irradiation.

[0060] In some embodiments, the photovoltaic module further includes a frame (not shown in the figure). The laminate formed by the panel layer 200, the first encapsulation layer 300, the solar cell 100, the second encapsulation layer 400 and the backplane layer 500 is disposed within the frame. The frame is used to improve the mechanical strength of the laminate.

[0061] The implementation scheme of the present application will be described in detail below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specific conditions in the following embodiments, the guidance given in the present application is preferably referred to, and it can also be carried out according to the experimental manuals or conventional conditions in the art, or according to the conditions recommended by the manufacturer, or referring to the experimental methods known in the art.

[0062] Example 1

[0063] This embodiment provides a solar cell 100, including a cell substrate 110 and solder tapes disposed on its surface. The cell substrate 110 is a TOPCon cell substrate, and its surface is divided into a first region 111 and second regions 112 located on both sides of the first region 111. The solder tapes include first solder tapes 120 and second solder tapes 130 arranged at equal intervals. Among them, the first solder tapes 120 are disposed on the first region 111, the number of the first solder tapes 120 is 2, the length of the first solder tapes 120 is 104 mm, and 8 glue dots 140 are attached at equal intervals on the first solder tapes 120. The height of the glue dots 140 is 140 μm, and the width is 1.45 mm; the second solder tapes 130 are disposed on the second regions 112, and the number of the second solder tapes 130 on each second region 112 is 2. 16 glue dots 140 are attached at equal intervals on the second solder tapes 130. The height of the glue dots 140 is 140 μm, and the width is 1.45 mm.

[0064] This embodiment also provides a photovoltaic module, including a panel layer 200, a first encapsulation layer 300, the above-mentioned solar cell 100, a second encapsulation layer 400, and a backplane layer 500 which are stacked in sequence.

[0065] Comparative Example 1

[0066] This comparative example provides a solar cell 100. Compared with Example 1, the difference is that the number of glue dots 140 attached to the second solder tapes 130 is the same as the number of glue dots 140 attached to the first solder tapes 120.

[0067] 100 solar cells with the structure of Example 1 and 100 solar cells with the structure of Comparative Example 1 are provided respectively, and their yield rates are detected. The unqualified products include: the edges of the solar cells showing white. The test results are shown in Table 1.

[0068] Table 1

[0069]

[0070] In summary, by increasing the number of adhesive dots 140 of the second solder tape 130 on the second region 112 of the solar cell 100, the present application improves the stability of the second solder tape 130 located on the outside, can effectively avoid the solder tape offset caused by the flow of the adhesive film during the lamination process, thereby avoiding the white exposure phenomenon of the solar cell 100, reducing the problem of virtual connection of the photovoltaic module, improving the product yield and the photoelectric conversion efficiency of the photovoltaic module.

[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0072] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A solar cell, characterized in that, The solar cell (100) includes: a cell substrate (110), the surface of the cell substrate (110) being divided into a first region (111) and second regions (112) on both sides of the first region (111); a first welding strip (120), the first welding strip (120) being disposed on the first region (111); a second welding strip (130), the second welding strip (130) being disposed on the second regions (112); adhesive dots (140), there being a plurality of the adhesive dots (140), both the first welding strip (120) and the second welding strip (130) being adhered to the cell substrate (110) through the adhesive dots (140), and the number of the adhesive dots (140) attached to a single second welding strip (130) being greater than the number of the adhesive dots (140) attached to a single first welding strip (120).

2. The solar cell according to claim 1, wherein The number of the second welding strips (130) disposed on each of the second regions (112) is 1 to 4.

3. The solar cell according to claim 1, wherein The ratio of the number of the adhesive dots (140) attached to a single second welding strip (130) to the number of the adhesive dots (140) attached to a single first welding strip (120) is 1 to 16.

4. The solar cell according to claim 1, wherein The number of the adhesive dots (140) attached to a single first welding strip (120) is 1 to 15.

5. The solar cell according to claim 1, wherein The number of the adhesive dots (140) attached to a single second welding strip (130) is 1 to 16.

6. The solar cell according to claim 1, wherein The number of the second welding strips (130) on each of the second regions (112) ≥ 2, and for two adjacent second welding strips (130) on the second region (112), the number of the adhesive dots (140) attached to the second welding strip (130) farther from the first region (111) is greater than the number of the adhesive dots (140) attached to the second welding strip (130) closer to the first region (111).

7. The solar cell according to claim 1, characterized in that, A plurality of the adhesive dots (140) are attached to each of the first welding strips (120), and the plurality of the adhesive dots (140) attached to two adjacent first welding strips (120) are arranged in a staggered manner in a direction perpendicular to the first welding strip (120); and / or, A plurality of the adhesive dots (140) are attached to each of the second welding strips (130), and the plurality of the adhesive dots (140) attached to two adjacent second welding strips (130) are arranged in a staggered manner in a direction perpendicular to the second welding strip (130).

8. The solar cell according to any one of claims 1-7, characterized in that, The height of the adhesive dot (140) is 100 μm to 200 μm; and / or, The width of the adhesive dot (140) is 1.0 mm to 2.0 mm.

9. A photovoltaic module, characterized in that, The photovoltaic module includes a plurality of the solar cells (100) as described in any one of claims 1 - 8.

10. The photovoltaic module according to claim 9, characterized in that, The photovoltaic module further includes a panel layer (200), a first encapsulation layer (300), a second encapsulation layer (400), and a backplane layer (500). The first encapsulation layer (300) and the panel layer (200) are sequentially stacked on one side surface of the solar cell (100) in a direction away from the solar cell (100); the second encapsulation layer (400) and the backplane layer (500) are sequentially stacked on the other side surface of the solar cell (100) that faces away from the panel layer (200) in a direction away from the solar cell (100).

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