Photovoltaic solder strip, photovoltaic module and photovoltaic system

Abstract

The utility model is suitable for the field of photovoltaic technology, and provides a photovoltaic solder strip, a photovoltaic assembly and a photovoltaic system. The photovoltaic welding strip comprises a welding strip body, a protruding structure and a groove structure. The convex structure is arranged on one side of the welding strip body and is arranged in a gap between two adjacent battery pieces of the photovoltaic module; the groove structure is formed on one side of the solder strip body and deviates from the convex structure, and the groove structure comprises a plurality of micro grooves. Thus, in the interconnection welding process of the photovoltaic welding strip and the battery piece, the protruding structure and the groove structure of the photovoltaic welding strip can release welding stress and relieve warping generated after the battery piece is welded, so that the subfissure rate and the fragment rate during lamination of the battery piece are reduced, and the reliability and attractiveness of a photovoltaic module product are improved. Meanwhile, the protruding structures and the groove structures can relieve the lamination stress of the photovoltaic welding strip, and the photovoltaic welding strip is prevented from arching.

Description

[0001] This application is a divisional application. The application number of the original application is 202223605061X, and the filing date of the original application is December 30, 2022. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The utility model belongs to the technical field of photovoltaics, and in particular relates to a photovoltaic welding strip, a photovoltaic component and a photovoltaic system. Background Art

[0003] Full back electrode contact crystalline silicon cells usually use solder ribbon interconnection welding. The battery cells are all single-sided welded, and the stress is concentrated on one side of the battery cell, which will cause the battery cell to bend. During lamination, the battery cell is prone to hidden cracks and breakage. At the same time, the solder ribbons between the battery cells will arch toward the backplane side due to the lamination force, causing a convex structure on the backplane, affecting the reliability and appearance of the component, thereby reducing the production yield. Utility Model Content

[0004] The embodiments of the utility model provide a photovoltaic welding strip, a photovoltaic module and a photovoltaic system, which are intended to solve the damage problems of full back electrode contact crystalline silicon cells such as bending, hidden cracks or breakage during the welding process.

[0005] The embodiment of the utility model is implemented as follows: the photovoltaic welding strip provided by the utility model includes a welding strip body, a protrusion structure and a groove structure. The protrusion structure is arranged on one side of the welding strip body, and the protrusion structure is arranged in the gap between two adjacent solar cells of the photovoltaic module; the groove structure is formed on the welding strip body and on one side away from the protrusion structure, and the groove structure includes a plurality of micro grooves.

[0006] Furthermore, there are multiple protruding structures, and along the length direction of the photovoltaic welding strip, the multiple protruding structures are arranged on the welding strip body at intervals.

[0007] Furthermore, there are multiple groove structures, and along the length direction of the photovoltaic welding strip, one groove structure is formed between two adjacent protrusion structures.

[0008] Furthermore, the groove structure includes a plurality of micro grooves, and the plurality of micro grooves are formed on the welding strip body at equal intervals.

[0009] Furthermore, a coating is formed on the protruding structure, and the coating is black or white.

[0010] Furthermore, the width of the welding strip body is 0.1 mm to 4 mm.

[0011] Furthermore, the height of the protruding structure is 0.1 mm to 0.5 mm.

[0012] The utility model also provides a photovoltaic assembly, which includes a first cover plate, a battery cell, the above-mentioned photovoltaic welding strip and a second cover plate which are stacked in sequence, the number of the battery cells is multiple, and the protruding structure is located between two of the battery cells.

[0013] Furthermore, the photovoltaic assembly also includes a bus bar, and the bus bar is used to connect the multiple battery cells.

[0014] The utility model also provides a photovoltaic system, which includes any one of the photovoltaic components described above.

[0015] The beneficial effect achieved by the utility model is that during the interconnection welding process between the photovoltaic welding ribbon and the battery cell, the convex structure and the groove structure of the photovoltaic welding ribbon can release the welding stress and alleviate the warping of the battery cell after welding, thereby reducing the rate of hidden cracks and fragments during the lamination of the battery cell, and improving the reliability and aesthetics of the photovoltaic module product. At the same time, the convex structure and the groove structure can also alleviate the lamination stress of the photovoltaic welding ribbon and prevent the photovoltaic welding ribbon from arching.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a module schematic diagram of the photovoltaic system provided by the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of the photovoltaic module provided by the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the photovoltaic welding strip provided by the utility model;

[0020] Figure 4 It is an enlarged schematic diagram of the photovoltaic welding strip provided by the utility model;

[0021] Figure 5 It is a schematic diagram of the planar structure of the photovoltaic module provided by the utility model;

[0022] Figure 6 It is a schematic diagram of the planar structure of the photovoltaic welding strip provided by the utility model.

[0023] Description of main component symbols:

[0024] Photovoltaic system 1000 , photovoltaic module 100 , first cover plate 20 , battery cell 30 , second cover plate 40 , adhesive film 50 , bus bar 60 , photovoltaic welding ribbon 10 , welding ribbon body 11 , protrusion structure 12 , coating 121 , groove structure 13 , micro groove 131 . DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0031] Embodiment 1

[0032] See also Figure 1 and Figure 2 The photovoltaic system 1000 in the embodiment of the present invention includes the photovoltaic module 100 in the embodiment of the present invention. The photovoltaic module 100 in the embodiment of the present invention includes a first cover plate 20, a battery cell 30, a photovoltaic welding strip 10 in the embodiment of the present invention, and a second cover plate 40 which are stacked in sequence. There are multiple battery cells 30, and the protruding structure 12 is located between two of the battery cells 30.

[0033] See also Figure 3 and Figure 4 The photovoltaic welding strip 10 of the embodiment of the utility model includes a welding strip body 11, a protrusion structure 12 and a groove structure 13. The protrusion structure 12 is arranged on one side of the welding strip body 11. The protrusion structure 12 is arranged in the gap between two adjacent battery cells 30 of the photovoltaic module 100. The groove structure 13 is formed on the welding strip body 11 and away from the protrusion structure 12. The groove structure 13 includes a plurality of micro grooves 131.

[0034] In this way, during the interconnection welding process between the photovoltaic welding ribbon 10 and the battery cell 30, the protruding structure 12 and the groove structure 13 of the photovoltaic welding ribbon 10 can release the welding stress and alleviate the warping of the battery cell 30 after welding, thereby reducing the hidden cracks and fragmentation rate of the battery cell 30 during lamination, and improving the product reliability and aesthetics of the photovoltaic module 100. At the same time, the protruding structure 12 and the groove structure 13 can also alleviate the lamination stress of the photovoltaic welding ribbon 10 and prevent the photovoltaic welding ribbon 10 from arching.

[0035] Specifically, when manufacturing the photovoltaic module 100, a number of battery cells 30 can be arranged crosswise in sequence, and the battery cells 30 can be interconnected and welded on the back side of the battery cells 30 through the photovoltaic welding ribbon 10, and the positive (negative) electrode on the back side of the previous battery cell 30 is connected to the negative (positive) electrode on the back side of the next battery cell 30 and heated and welded together.

[0036] During welding, the welding strip body 11 is located below the battery cell 30, wherein the protruding direction of the protruding structure 12 is the welding direction of the photovoltaic welding strip 10 and the battery cell 30, and the groove structure 13 is located on the lower surface of the welding strip body 11, and the lower surface is arranged opposite to the welding surface. Among them, the protruding structure 12 is just located in the gap between the two battery cells 30, so the protruding structure 12 can release part of the welding stress and alleviate the warping of the battery cell 30 after welding.

[0037] Among them, along the length direction A of the photovoltaic welding strip 10, the cross section of the protruding structure 12 can be arc-shaped or triangular, etc. Preferably, the protruding structure 12 with an arc-shaped cross section can not only release and relieve stress, but also reduce the wear of the protruding structure 12 on the inside of the photovoltaic module 100 during welding.

[0038] It should be noted that the cell 30 in the embodiment of the utility model is a full back electrode contact crystalline silicon photovoltaic cell (IBC cell). The PN junction and metal contact of the IBC cell are both on the back of the cell, and the positive and negative metal electrodes are arranged in a forked finger manner on the back of the cell. The front of the cell is not blocked by metal grid lines, which can bring more effective power generation area, which is beneficial to improving the power generation efficiency of the photovoltaic module 100.

[0039] In the photovoltaic module 100 of the embodiment of the utility model, the first cover plate 20 and the second cover plate 40 serve as the outer shell of the photovoltaic module 100, and play the role of protecting the array of battery cells 30 and the photovoltaic welding strip 10. The first cover plate 20 can be made of an organic polymer material with good light transmittance. The material of the second cover plate 40 can be KPF, KPK, TPT, KPC, etc., which is not limited here.

[0040] The photovoltaic module 100 may further include an adhesive film 50, which may be used to bond the first cover plate 20 and the cell sheet 30, and may also be used to bond the second cover plate 40 and the optical welding tape. EVA, POE, PVB, or a composite material of EVA and POE. Under high temperature and high pressure lamination conditions, the adhesive film 50 will melt to bond the inside of the photovoltaic module 100 together to form a whole.

[0041] Furthermore, in an embodiment of the utility model, the photovoltaic system 1000 can be used in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be used in equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc.

[0042] Of course, it is understandable that the application scenarios of the photovoltaic system 1000 are not limited to this, that is, the photovoltaic system 1000 can be used in all fields where solar energy is required for power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a junction box and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules 100. For example, multiple photovoltaic modules 100 may form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box, which can converge the current generated by the photovoltaic array. The converged current flows through the inverter and is converted into the alternating current required by the mains power grid, and then connected to the mains network to realize solar power supply.

[0043] See also Figure 5 In some embodiments, the photovoltaic module 100 may further include a bus bar 60, which is used to connect the plurality of cells 30. Thus, the bus bar 60 may be used to achieve internal conduction of the plurality of cells 30.

[0044] More specifically, after welding a plurality of cells 30 to the photovoltaic ribbon 10, the welded cells 30 are arranged, and then the bus bar 60 is welded to the cells 30. The lead-out end of the bus bar 60 can be used to connect to a junction box, which can connect the power generated by the cells 30 to an external circuit to conduct the current generated by the photovoltaic module 100.

[0045] In some embodiments, there are multiple bus bars 60, and the multiple bus bars 60 are arranged at intervals along the length direction B of the photovoltaic module 100, wherein the length direction B of the photovoltaic module 100 is perpendicular to the length direction A of the photovoltaic ribbon 10. In one embodiment, three bus bars 60 are arranged at intervals on the battery cell 30 along the length direction B of the photovoltaic module 100.

[0046] In order to make the busbar 60 similar or the same color as other components of the photovoltaic module 100 to ensure the beauty of the photovoltaic module 100, it is necessary to color process the busbar 60. For example, if the photovoltaic module 100 is black as a whole, a black busbar 60 is selected; if the photovoltaic module 100 is white as a whole, a white busbar 60 is selected. In some embodiments, the photovoltaic module 100 may also include a cushion bar (not shown), which may be arranged at the busbar 60 to shield the photovoltaic welding ribbon 10 and the busbar 60, so as to achieve a pure black or pure white effect of the photovoltaic module 100.

[0047] Embodiment 2

[0048] See also Figure 3 In some embodiments, the number of the protruding structures 12 is multiple, and along the length direction A of the photovoltaic welding strip 10, the multiple protruding structures 12 are arranged on the welding strip body 11 at intervals.

[0049] In this way, the arrangement of the plurality of protruding structures 12 can prevent the plurality of battery cells 30 from warping after welding, and from cracking or breaking during lamination.

[0050] More specifically, the photovoltaic module 100 may include a plurality of cells 30, and the plurality of cells 30 can ensure that the generated voltage can reach the desired value, and avoid the voltage failing to reach the standard due to too few cells 30. Therefore, a plurality of protruding structures 12 are provided on the welding strip body 11, so as to ensure that a protruding structure 12 is provided between two adjacent cells 30. During the welding process, the protruding structure 12 is used to absorb the welding stress, and avoid the stress being concentrated on one side of the cell 30, causing the cell 30 to bend; at the same time, when laminating the photovoltaic module 100, the protruding structure 12 can relieve the lamination stress of the photovoltaic welding strip 10, and avoid the photovoltaic welding strip 10 arching toward one side of the second cover plate 40, causing the protruding structure of the photovoltaic module 100.

[0051] When there are multiple cells 30 in the photovoltaic module 100, each protruding structure 12 can be located in the gap between two adjacent cells 30, so as to absorb welding stress and alleviate the warping generated after welding of each cell 30, while reducing the fragmentation rate of each cell 30 during lamination, thereby improving the aesthetics of the photovoltaic module 100.

[0052] Embodiment 3

[0053] See also Figure 3 In some embodiments, there are multiple groove structures 13 , and along the length direction A of the photovoltaic welding strip 10 , a groove structure 13 is formed between two adjacent protrusion structures 12 .

[0054] In this way, along the length direction A of the photovoltaic welding strip 10, the protrusion structure 12 and the groove structure 13 are cross-arranged to ensure that the protrusion structure 12 is located exactly in the gap between two adjacent battery cells 30 during welding, and the groove structure 13 is located below the battery cell 30. The cooperation between the protrusion structure 12 and the groove structure 13 can effectively release welding stress, avoid warping of the battery cell 30 or arching of the welding strip body 11, and reduce hidden cracks during lamination of the battery cell 30, thereby improving the appearance of the photovoltaic module 100 and improving the production yield.

[0055] Embodiment 4

[0056] See also Figure 3 and Figure 4 In some embodiments, a plurality of micro grooves 131 are formed on the welding strip body 11 at equal intervals.

[0057] In this way, the multiple micro grooves 131 can greatly enhance the release of welding stress by the groove structure 13 , thereby more effectively preventing the battery cell 30 from warping, etc., and ensuring the aesthetics and production yield of the photovoltaic module 100 .

[0058] Among them, a groove structure 13 may include 3, 5, 6 or 8 micro grooves 131. Along the length direction A of the photovoltaic welding strip 10, the cross section of the micro groove 131 may be rectangular or semicircular, etc. Specifically, the number, depth and spacing of the micro grooves 131 can be adjusted and designed according to actual conditions.

[0059] Embodiment 5

[0060] See also Figure 4 and Figure 6 In some embodiments, a coating 121 is formed on the protruding structure 12, and the coating 121 is black or white. Thus, since the black or white coating 121 is already formed on the protruding structure 12, it is not necessary to add a spacer between the cells 30, and the production of a fully black or white photovoltaic module 100 can be achieved, which reduces the process difficulty.

[0061] Specifically, the coating 121 has good weather resistance and can withstand the test of climate, such as the combined damage caused by light, heat, cold, wind, rain, bacteria, etc., thereby ensuring the service life of the photovoltaic welding strip 10.

[0062] In order to make the photovoltaic module 100 uniform in color and thus ensure the beauty of the photovoltaic module 100, the photovoltaic module 100 is black as a whole, and the coating 121 on the protruding structure 12 is black; if the photovoltaic module 100 is white as a whole, the coating 121 on the protruding structure 12 is white. In this way, the production of the all-black or all-white photovoltaic module 100 is realized, the process difficulty is reduced, the equipment automation rate is improved, and the product yield and production efficiency are improved.

[0063] Embodiment 6

[0064] See also Figure 6 In some embodiments, the width W of the welding ribbon body 11 is 0.1 mm to 4 mm. In this way, the photovoltaic welding ribbon 10 and the solar cell 30 can be effectively welded to avoid the welding ribbon body 11 being too narrow to be convenient for welding.

[0065] Specifically, in such an embodiment, the width W of the welding ribbon body 11 can be 0.1 mm, 0.5 mm, 1 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.9 mm, 3 mm, 3.2 mm, 3.3 mm, 3.5 mm, 3.8 mm or 4 mm, etc. The width of the welding ribbon body 11 is slightly smaller than the spacing between two adjacent battery cells 30.

[0066] Embodiment 7

[0067] In some embodiments, the height of the protruding structure 12 is 0.1 mm to 0.5 mm. Thus, setting the height of the protruding structure 12 within a reasonable range can release the welding stress during the welding process of the battery cell 30 and ensure the miniaturization of the photovoltaic welding ribbon 10.

[0068] Specifically, in such an embodiment, the height of the protruding structure 12 can be 0.1 mm, 0.13 mm, 0.15 mm, 0.19 mm, 0.2 mm, 0.24 mm, 0.26 mm, 0.29 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm, 0.41 mm, 0.43 mm, 0.46 mm or 0.5 mm, etc. It should be noted that the height of the protruding structure 12 can be designed according to the height of the warping of the battery cell 30 after welding.

[0069] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic welding ribbon, characterized in that: include Welding strip body; A protruding structure, wherein the protruding structure is arranged on one side of the welding strip body, the protruding structure is arranged in the gap between two adjacent solar cells of the photovoltaic module, and the photovoltaic welding strip connects the opposite-sex electrodes on the back sides of the two adjacent solar cells; and A groove structure is formed on the welding strip body and on a side away from the protruding structure, and the groove structure includes a plurality of micro grooves.

2. The photovoltaic welding strip according to claim 1, characterized in that: There are multiple protruding structures, and along the length direction of the photovoltaic welding strip, the multiple protruding structures are arranged on the welding strip body at intervals.

3. The photovoltaic welding strip according to claim 2, characterized in that: There are multiple groove structures, and along the length direction of the photovoltaic welding strip, one groove structure is formed between two adjacent protrusion structures.

4. The photovoltaic welding strip according to claim 1, characterized in that: A plurality of micro grooves are formed on the welding strip body at equal intervals.

5. The photovoltaic welding ribbon according to claim 1, characterized in that: A coating is formed on the protruding structure, and the coating is black or white.

6. The photovoltaic welding ribbon according to claim 1, characterized in that: The width of the welding strip body is 0.1 mm to 4 mm.

7. The photovoltaic welding ribbon according to claim 1, characterized in that: The height of the protruding structure is 0.1 mm to 0.5 mm.

8. A photovoltaic module, characterized in that: include: A first cover plate, a battery cell, the photovoltaic welding strip according to any one of claims 1 to 7, and a second cover plate are stacked in sequence, wherein the number of the battery cells is multiple, and the protruding structure is located between two of the battery cells.

9. The photovoltaic module according to claim 8, characterized in that: The photovoltaic assembly further includes a bus bar, which is used to connect the plurality of battery cells.

10. A photovoltaic system, characterized in that: A photovoltaic module comprising any one of claims 8 to 9.

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