Screen, jig and photovoltaic module

Abstract

The embodiment of the application provides a screen, a jig and a photovoltaic module, and belongs to the technical field of photovoltaic cells. The screen is used for printing target paste on a welding strip. The screen comprises at least one strip-shaped aperture arranged along a first direction, and the length of the strip-shaped aperture is matched with the length of a cell piece. The technical scheme of the embodiment of the application forms a section of paste on the welding strip for welding with the back surface of the cell piece by printing the target paste with the length matched with the length of the cell piece on the welding strip, so that the welding strip can be conveniently welded and fixed with the front surface and the back surface of the cell piece respectively.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and more particularly to a screen, fixture and photovoltaic module. Background Technology

[0002] In photovoltaic modules, to increase reflectivity, irregularly shaped solder ribbons, such as triangular solder ribbons, are used to string together solar cells. The two sides of the triangular solder ribbon are coated with silver to increase light reflection. However, when this triangular solder ribbon is welded to the front of the solar cell, the uncoated side can be firmly welded to the cell surface. But when it is then routed around to the back of the cell, the top edge of the triangular solder ribbon contacts the cell surface, and the area around the edge is coated with silver, making welding more difficult. Summary of the Invention

[0003] This application provides a screen printing plate, a fixture, and a photovoltaic module to solve or alleviate one or more technical problems in the prior art.

[0004] As a first aspect of the present application, the present application provides a screen printing plate for printing target paste on solder strips. The screen printing plate includes at least one strip-shaped perforation arranged along a first direction, the length of which is adapted to the length of the solar cell.

[0005] In one embodiment, the screen is provided with a plurality of strip-shaped perforations arranged in sequence in a second direction, which is perpendicular to the first direction.

[0006] In one embodiment, the first direction is the same as the length direction of the strip-shaped perforations; the screen is provided with a plurality of strip-shaped perforations along the first direction, and a white plate area is formed between adjacent strip-shaped perforations, the length of the white plate area being adapted to the length of the battery cell.

[0007] In one embodiment, the screen further includes at least one limiting protrusion disposed on the side of the screen away from the target slurry inlet, the at least one limiting protrusion being fixed to the white board area or the strip-shaped perforation, the limiting protrusion having a recess facing inwards towards the screen, the recess being used to define the position of the solder strip.

[0008] In one embodiment, the shape of the notch is adapted to the shape of the solder strip.

[0009] In one embodiment, a whiteboard area or strip-shaped perforation is provided with 1-9 limiting protrusions.

[0010] In one embodiment, the limiting protrusions on the multiple whiteboard areas or multiple strip-shaped perforations arranged sequentially along the second direction are integrated as a single unit.

[0011] In one embodiment, the limiting protrusion is integrally formed with the screen printing plate.

[0012] In one embodiment, it further includes at least two height limiting blocks, which are disposed at both ends of the strip-shaped perforation; the difference between the height of the height limiting blocks and the height of the limiting protrusion is 1 / 10 to 3 / 5 of the thickness of the whiteboard area.

[0013] As a second aspect of the present application, the present application provides a fixture, including a fixture body, the surface of which is provided with a plurality of strip grooves for accommodating solder strips, the depth of which is less than the thickness of the solder strips.

[0014] In one embodiment, the width of the strip groove gradually increases along the direction of the opening.

[0015] In one embodiment, the depth of the strip groove is 1 / 4 to 2 / 3 of the thickness of the solder strip.

[0016] In one embodiment, the length of the strip groove is greater than the length of the welding strip, or the strip groove extends through the length direction of the fixture body.

[0017] In one embodiment, a plurality of strip grooves are arranged sequentially along a third direction, and the spacing between adjacent strip grooves is adapted to the spacing between adjacent strip holes in a second direction in the screen.

[0018] In one embodiment, fasteners are also included for securing the welding strip to the strip groove.

[0019] As a third aspect of the embodiments of this application, this application provides a photovoltaic module, including a plurality of solar cells and a solder ribbon, wherein the solder ribbon connects the plurality of solar cells in series, and the solder ribbon includes a solder ribbon body and a paste layer obtained by printing a target paste on the solder ribbon body using a screen printing plate of any of the above embodiments.

[0020] In one embodiment, the target paste includes tin paste or nickel paste.

[0021] The technical solution of this application embodiment prints a target paste of a length adapted to the length of the battery cell on the solder strip, so that a section of paste for welding to the back of the battery cell is formed on the solder strip, so that the solder strip can be easily welded and fixed to the front and back of the battery cell respectively.

[0022] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0024] Figure 1 This is a top view schematic diagram of a screen printing plate according to an embodiment of the present application for printing target paste on solder ribbon.

[0025] Figure 2 A side view of the screen printing according to an embodiment of this application is shown.

[0026] Figure 3 Show Figure 2 A magnified schematic diagram of the structure at position A in the middle.

[0027] Figure 4 This diagram shows another side view of the screen layout according to an embodiment of the present application.

[0028] Figure 5 Show Figure 4 A magnified schematic diagram of the structure at position B in the middle.

[0029] Figure 6 A top view of the fixture according to an embodiment of this application is shown.

[0030] Figure 7 A side view of the fixture according to an embodiment of this application is shown.

[0031] Figure 8 Show Figure 7 A magnified schematic diagram of the structure at position C. Detailed Implementation

[0032] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0033] This application provides a screen printing version, such as... Figures 1 to 5 As shown. The screen 10 is used to print the target paste on the solder ribbon 30. The screen 10 includes at least one strip-shaped perforation 20 arranged along a first direction, the length of which is adapted to the length of the solar cell.

[0034] This application embodiment is used to print a target paste adapted to the length of the solar cell onto a solder ribbon 30. The solder ribbon 30 can be, for example, a triangular solder ribbon 30, a trapezoidal solder ribbon 30, or an irregularly shaped solder ribbon 30 including inclined sides. The inclined sides are coated with silver to increase light reflection and improve power generation efficiency. However, when the solder ribbon 30 is soldered to the back of the solar cell, the top and sides of the solder ribbon 30 are coated with silver, making soldering inconvenient. By printing the target paste onto a pre-defined section of the solder ribbon 30 to be soldered to the back of the solar cell, the resulting paste layer can be well soldered and fixed to the back of the solar cell. In addition, the printed paste layer can also flatten the top of the solder ribbon 30 at this location, improving the efficiency of solder ribbon 30 soldering.

[0035] The technical solution of this application embodiment prints a target paste of a length adapted to the length of the battery cell on the solder ribbon 30, so that a section of paste for welding to the back of the battery cell is formed on the solder ribbon 30, so that the solder ribbon 30 can be easily welded and fixed to the front and back of the battery cell respectively.

[0036] In one embodiment, the screen 10 has a plurality of strip-shaped perforations 20 arranged in sequence in a second direction, the second direction being perpendicular to the first direction.

[0037] The screen 10 may have multiple strip-shaped perforations 20 in the first direction, so that multiple sections of paste layer with target paste can be printed in multiple areas of a solder strip 30; or a section of paste layer with target paste can be printed on multiple solder strips 30.

[0038] In addition, multiple strip-shaped perforations 20 are provided in the second direction, so that multiple segments of paste layers with the target paste can be printed in multiple areas of multiple solder strips 30.

[0039] The first and second directions are perpendicular, thereby enabling simultaneous printing at multiple positions in the longitudinal and transverse directions of multiple solder strips 30, improving printing efficiency.

[0040] In one embodiment, the first direction is the same as the length direction of the strip-shaped perforations 20; the screen 10 is provided with a plurality of strip-shaped perforations 20 along the first direction, and a white board area is formed between adjacent strip-shaped perforations 20, the length of the white board area being adapted to the length of the battery cell.

[0041] Along the length of the strip-shaped perforation 20, a strip of paste is printed on the solder ribbon 30. This section of solder ribbon 30 is used to weld and fix it to the back of the battery cell. After the solder ribbon 30 is welded to the back of the battery cell, it needs to be welded to the front of the battery cell to achieve series welding of the battery cells. Therefore, the solder ribbon 30 corresponding to the white area indicates that no paste has been printed on the solder ribbon 30. This section of solder ribbon 30 is used to weld and fix it to the front of the battery cell. Therefore, the length of the white area is adapted to the length of the battery cell, so that after printing multiple sections of paste on a solder ribbon 30, the resulting solder ribbon 30 can be used for continuous series welding of multiple battery cells.

[0042] In one embodiment, the screen 10 further includes at least one limiting protrusion 50 disposed on the side of the screen 10 away from the target slurry inlet. The at least one limiting protrusion 50 is fixed to the white board area or the strip-shaped perforation 20. The limiting protrusion has a recess 51 that is recessed toward the screen 10. The recess 51 is used to define the position of the solder strip 30.

[0043] Since the solder ribbon 30 is a thinner and narrower strip, it is difficult to fix it compared to the screen 10 printed on the battery cell. In this embodiment, the position of the solder ribbon 30 is defined by the notch 51 in the limiting protrusion 50, so that the paste flowing out from the hole can be accurately printed on the target position on the solder ribbon 30.

[0044] In this embodiment, the position of the solder strip 30 can be aligned by the recess 51 in the limiting protrusion 50, ensuring that the paste is printed on the solder strip 30 and improving printing efficiency.

[0045] In one embodiment, the shape of the notch 51 is adapted to the shape of the solder strip 30.

[0046] In one example, such as Figures 2 to 3 As shown, the solder strip 30 is a triangular structure with a pointed top. Therefore, the notch 51 can be shaped with a sharp angle, making the positioning of the solder strip 30 more precise. In practical applications, even with a triangular solder strip 30, it can be positioned as follows: Figures 4 to 5 The bottom of the notch 51 shown is flat.

[0047] In one example, notch 51 is as follows: Figures 4 to 5 When the bottom of the notch 51 shown is flat, the limiting protrusion 50 is more conveniently positioned at the strip-shaped perforation 20. The notch 51 is as follows... Figures 2 to 3 When the bottom of the notch 51 shown is a pointed structure, the limiting protrusion 50 is more convenient to be set in the whiteboard area.

[0048] In one example, if the solder strip 30 is a trapezoidal structure, then it can be used as follows: Figures 4 to 5 The bottom of the notch 51 shown is flat.

[0049] In one example, the sidewall of the recess 51 in the limiting protrusion 50 is as thin as possible, so that the limiting protrusion 50 forms a claw shape, which makes it easy to move the solder strip 30 into the recess 51.

[0050] In one embodiment, a whiteboard area or strip-shaped perforation 20 is provided with 1-9 limiting protrusions 50.

[0051] The solder strip 30 is long and narrow. In order to stably move the solder strip 30 into the notch 51, it is necessary to perform a turning operation at multiple positions of the solder strip 30. This ensures that the turning operation can be performed stably and efficiently, and also ensures that multiple positions of the solder strip 30 are within the notch 51, thus preventing the solder strip 30 from tilting and affecting printing.

[0052] In one example, a whiteboard area or strip cutout 20 is provided with 1-9 limiting protrusions 50. For example, there can be 1. In the case of a whiteboard area or strip cutout 20, there is usually at least one strip cutout 20 in the first direction of the screen 10. Then the screen 10 has at least two limiting protrusions 50, which can respectively move the solder strip 30 from the head and tail of the solder strip 30 into the notch 51.

[0053] For example, a whiteboard area or strip-shaped perforation 20 may also be provided with 2, 3, 5, 6, 8 or 9 limiting protrusions 50 to coordinate the operation and move the solder strip 30 into the recess 51.

[0054] In one embodiment, the limiting protrusions 50 on the plurality of whiteboard areas or the plurality of strip-shaped perforations 20 arranged sequentially along the second direction are integrated as a single unit.

[0055] The integrated limiting protrusion 50 facilitates the processing of the screen printing plate 10 and reduces the production cost of the screen printing plate 10.

[0056] In addition, the integrated limiting protrusion 50 can enhance the stability of the limiting protrusion 50, prevent the limiting protrusion 50 from deforming, and affect the pushing effect of the welding strip 30, thereby improving the service life of the screen 10.

[0057] In one embodiment, the limiting protrusion 50 is integrally formed with the screen 10. The material of the limiting protrusion 50 and the screen 10 can be the same. For example, if the screen 10 is made of a film, then the limiting protrusion 50 is made of film; if the screen 10 is a wire mesh screen, then the limiting protrusion 50 is made of metal. The fact that the two materials are the same or similar, and can be integrally formed, can further strengthen the rigidity of the limiting protrusion 50 and further extend the service life of the screen 10.

[0058] In one embodiment, it further includes at least two height limiting blocks 40, which are disposed at both ends of the strip-shaped perforation 20; the difference between the height of the height limiting block 40 and the height of the limiting protrusion 50 is 1 / 10 to 3 / 5 of the thickness of the whiteboard area.

[0059] Height limiting blocks 40 can be installed at both ends of the screen 10, i.e., the beginning and the end, to support the screen 10. Height limiting blocks 40 can be made of elastic or rigid material. Height limiting blocks 40 can be rotatably installed on the screen 10 or fixedly installed on the screen 10.

[0060] The height of the height-limiting block 40 is higher than that of the limiting protrusion 50, so that when the screen 10 contacts the platform, the limiting protrusion 50 remains suspended.

[0061] The height of the height limiting block 40 can also be adjustable, for example, it can be adjusted according to the height of the solder strip 30, thereby adjusting the area of ​​the paste printed on the solder strip 30.

[0062] Other configurations of the screen version 10 in the above embodiments can be adopted from various technical solutions that are now and will be known to those skilled in the art, and will not be described in detail here.

[0063] This application also provides a fixture, such as... Figures 6 to 8 The fixture includes a jig body 60, the surface of which is provided with a plurality of strip grooves 61 for accommodating the welding strip 30, the depth of which is less than the thickness of the welding strip 30.

[0064] This application provides a fixture for loading a solder ribbon 30 into which the target paste to be printed is to be loaded. The solder ribbon 30 is confined within the strip groove 61 by the setting of the strip groove 61. Furthermore, the depth of the strip groove 61 is less than the thickness of the solder ribbon 30, so that the solder ribbon 30 protrudes from the strip groove 61, which facilitates the printing of paste on the upper surface or upper side of the solder ribbon 30.

[0065] This application embodiment improves the printing efficiency of solder ribbons 30 by providing a fixture for printing paste on the solder ribbons 30, thereby stabilizing the solder ribbons 30. Furthermore, the fixture body 60 is provided with multiple strip-shaped grooves 61, allowing simultaneous printing on multiple solder ribbons 30.

[0066] It is understandable that the spacing between adjacent strip grooves 61 is adapted to the spacing between adjacent strip holes 20 in the screen 10.

[0067] In one embodiment, the width of the strip groove 61 gradually increases along the direction of the opening.

[0068] This allows the upper side of the solder strip 30 to easily contact the target paste, improving the printing effect.

[0069] In one embodiment, the depth of the strip groove 61 is 1 / 4 to 2 / 3 of the thickness of the solder strip 30.

[0070] In one example, the depth of the groove 61 is 1 / 4, 1 / 2, or 2 / 3 of the thickness of the solder strip 30, causing the solder strip 30 to protrude from the groove 61.

[0071] In one embodiment, the length of the strip groove 61 is greater than the length of the welding strip 30, or the strip groove 61 extends through the length direction of the fixture body 60.

[0072] The strip groove 61 needs to be long enough to accommodate the length of the welding strip 30. Therefore, when the welding strip 30 is in segments, the length of the strip groove 61 can be greater than the length of the welding strip 30.

[0073] When the length of the welding strip 30 is infinite, at least one end of the strip groove 61 extends to the side of the fixture body 60, so that an opening is formed on the side of the fixture body 60 to facilitate the insertion of the welding strip 30.

[0074] In one embodiment, a plurality of strip grooves 61 are arranged sequentially along a third direction, and the spacing between adjacent strip grooves 61 is adapted to the spacing between adjacent strip holes 20 in the second direction of the screen 10.

[0075] The multiple strip grooves 61 allow for simultaneous printing on multiple solder strips 30, improving printing efficiency.

[0076] In one embodiment, a fastener is also included for securing the welding strip 30 to the strip groove 61. The fastener may be a fastening strip that presses against the strip groove 61, and the fastener may simultaneously secure multiple strip grooves 61. The fastener may be a rubber band or the like, or a limiting strip that is rotatably connected to the fixture body 60 and presses against multiple strip grooves 61 after rotation.

[0077] In this embodiment, the fasteners are used to further secure the multiple solder strips 30, making it easier for the screen printing plate 10 to print on the multiple solder strips 30.

[0078] This application also provides a photovoltaic module, including a plurality of solar cells and a solder ribbon 30, wherein the solder ribbon 30 connects the plurality of solar cells in series, and the solder ribbon 30 includes a solder ribbon 30 body and a paste layer obtained by printing a target paste on the solder ribbon 30 body using a screen 10 of any of the above embodiments.

[0079] In one embodiment, the target paste includes tin paste or nickel paste. The target paste can be any conductive paste.

[0080] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0081] Furthermore, 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0084] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A screen printing plate, characterized in that, For printing target paste on solder strips, the screen includes at least one strip-shaped perforation arranged along a first direction, the length of which is adapted to the length of the solar cell.

2. The screen printing plate according to claim 1, characterized in that, The screen is provided with a plurality of strip-shaped perforations arranged in sequence in a second direction, which is perpendicular to the first direction.

3. The screen printing plate according to claim 2, characterized in that, The first direction is the same as the length direction of the strip-shaped perforation; the screen is provided with a plurality of strip-shaped perforations along the first direction, and a white board area is formed between adjacent strip-shaped perforations, the length of the white board area being adapted to the length of the battery cell.

4. The screen printing plate according to claim 3, characterized in that, The screen also includes at least one limiting protrusion disposed on the side of the screen away from the target slurry inlet. At least one of the limiting protrusions is fixed to the white board area or the strip-shaped perforation. The limiting protrusion has a recess facing inward toward the screen, and the recess is used to define the position of the solder strip.

5. The screen printing plate according to claim 4, characterized in that, The shape of the notch is adapted to the shape of the welding strip.

6. The screen printing plate according to claim 4 or 5, characterized in that, One of the whiteboard areas or the strip-shaped perforation is provided with 1 to 9 of the limiting protrusions.

7. The screen printing plate according to claim 4 or 5, characterized in that, The limiting protrusions on the multiple whiteboard areas or multiple strip-shaped perforations arranged sequentially along the second direction are integrated as a single unit.

8. The screen printing plate according to claim 4 or 5, characterized in that, The limiting protrusion is integrally formed with the screen.

9. The screen printing plate according to claim 4 or 5, characterized in that, It also includes at least two height limiting blocks, which are disposed at both ends of the strip-shaped perforation; the difference between the height of the height limiting block and the height of the limiting protrusion is 1 / 10 to 3 / 5 of the thickness of the whiteboard area.

10. A jig, characterized in that, The fixture includes a jig body, the surface of which is provided with a plurality of strip-shaped grooves for accommodating the welding strip, the depth of which is less than the thickness of the welding strip.

11. The fixture according to claim 10, characterized in that, The width of the strip groove gradually increases along the direction of the opening.

12. The fixture according to claim 10, characterized in that, The depth of the groove is 1 / 4 to 2 / 3 of the thickness of the welding strip.

13. The fixture according to claim 10, characterized in that, The length of the strip groove is greater than the length of the welding strip, or the strip groove extends through the length of the fixture body.

14. The jig according to any one of claims 10 to 13, characterized in that, The plurality of the strip grooves are arranged sequentially along a third direction, and the spacing between adjacent strip grooves is adapted to the spacing between adjacent strip holes in the second direction of the screen.

15. The fixture according to claim 14, characterized in that, It also includes fasteners for securing the weld strip to the strip groove.

16. A photovoltaic module, characterized in that, It includes multiple battery cells and a solder ribbon, wherein the solder ribbon strings together the multiple battery cells, and the solder ribbon includes a solder ribbon body and a paste layer obtained by printing a target paste on the solder ribbon body using a screen as described in any one of claims 1 to 9.

17. The photovoltaic module according to claim 16, characterized in that, The target paste includes tin paste or nickel paste.

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