Net pressing device

Abstract

The utility model relates to a net pressing device. The net pressing device comprises a net pressing base plate. The net pressing base plate is provided with an abutting face used for pressing the welding wire and the skin film. A plurality of grooves are sequentially formed in the abutting face at intervals, each groove extends to the other opposite side from one side of the net pressing base plate, and the grooves can contain welding wires. During use, the abutting surface of the net pressing substrate abuts against a skin film and a welding wire, the welding wire can be correspondingly embedded into the groove and better wrapped by the skin film under the action of the abutting force, and meanwhile, the skin film can be wrapped and fixed outside the welding wire in a thermal shrinkage manner under the heating action of the heating table on a battery piece. Therefore, compared with the mode that no groove is formed, the skin films on the two opposite sides of the welding wire can be more tightly attached to and wrap the outer wall of the welding wire, good physical contact is achieved, then the skin films and the welding wire can be prevented from forming a herringbone hollow area, and the electrical performance of a product can be improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a screen pressing device. Background Art

[0002] In the photovoltaic field, stringing is to connect multiple cells into a string through welding wire using infrared welding. Due to the high welding temperature, infrared welding is not suitable for thin, low-temperature, and low-silver cells. For such cells, a solder-free process is generally used to fix the welding wire and the cell. The solder-free process is mainly divided into two types: adhesive process and laminating process. The adhesive process is subdivided into UV light curing and thermal curing, that is, glue is used to bond the cell and the welding wire, while the laminating process mainly fixes the welding wire by heating the skin film to thermally attach the cell. For the laminating process, the skin film is cut and transported to the heating platform, and the skin film is directly pressed by a pressing device, so that the skin film is heated and attached to the cell, and the skin film shrinks and presses the welding wire, thereby achieving the effect of fixing the welding wire. However, in the process of pressing the skin film by the pressing device, the left and right sides of the welding wire are not well wrapped with the skin film, thereby forming a herringbone hollow area, which leads to reduced product performance. Summary of the invention

[0003] Based on this, it is necessary to overcome the defects of the prior art and provide a mesh pressing device, which can achieve the skin membrane tightly wrapped around the outside of the welding wire, avoid the appearance of a herringbone hollow area, thereby improving product performance.

[0004] A screen pressing device, comprising:

[0005] A pressing mesh substrate is provided with a pressing surface for pressing the welding wire and the skin membrane, and a plurality of grooves arranged in sequence and spaced apart are formed on the pressing surface, each of the grooves extends from one side of the pressing mesh substrate to the other opposite side, and the grooves can accommodate the welding wire.

[0006] In one embodiment, the cross-sectional profile of the groove along its extension direction is semicircular, semi-elliptical or polygonal.

[0007] In one embodiment, all the grooves are arranged on the pressing surface at equal intervals.

[0008] In one embodiment, the pressed mesh substrate includes a main body plate and an abutment plate connected to the main body plate, the abutment plate is configured as a non-metallic material plate, and the abutment surface is configured on a side of the abutment plate facing away from the main body plate.

[0009] In one embodiment, the main body plate is configured as a metal plate.

[0010] In one embodiment, the screen pressing device further comprises a movable frame, and the movable frame is connected to the screen pressing substrate.

[0011] In one of the embodiments, magnetic suction components are respectively provided at two opposite ends of the movable frame, and both of the two magnetic suction components are used for magnetically cooperating with the electromagnet.

[0012] In one embodiment, the movable frame includes a connecting portion connected to the press mesh substrate and two mounting portions respectively disposed at opposite ends of the connecting portion, and the two magnetic suction members are respectively correspondingly mounted on the two mounting portions.

[0013] In one of the embodiments, a plurality of hollow holes are provided on the press-mesh substrate.

[0014] In one of the embodiments, each of the hollow holes is configured as a circular hole, an elliptical hole or a polygonal hole; the hollow holes are arranged in an array; and the hollow holes penetrate two opposite sides of the pressed mesh substrate.

[0015] The above-mentioned pressing device optimizes the shape of the pressing surface of the pressing substrate, and specifically provides a groove that can accommodate the welding wire. When in use, the pressing surface of the pressing substrate presses the skin membrane and the welding wire. Under the action of the pressing force, the welding wire can be embedded in the groove and better wrapped by the skin membrane. At the same time, under the heating action of the heating table on the battery cell, the skin membrane can be heat-shrinked and fixed to the outside of the welding wire. It can be seen that compared with the method without the groove, the skin membranes on the opposite sides of the welding wire can be more closely wrapped on the outer wall of the welding wire to achieve good physical contact, thereby avoiding the formation of a herringbone hollow area between the skin membrane and the welding wire, thereby improving the electrical performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A simplified structural diagram of a mesh pressing device according to an embodiment of the present application preparing to press against a skin membrane.

[0017] Figure 2 This is a structural diagram from one perspective of a screen pressing device according to an embodiment of the present application.

[0018] Figure 3 This is a structural diagram from another perspective of a screen pressing device according to an embodiment of the present application.

[0019] Figure 4 for Figure 3 Enlarged structural diagram at A.

[0020] 10. Pressed mesh substrate; 101. Pressing surface; 102. Groove; 103. Hollow hole; 11. Main body plate; 12. Abutment plate; 20. Welding wire; 30. Skin membrane; 40. Battery cell; 50. Moving frame; 51. Connecting part; 52. Mounting part; 60. Magnetic element. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] As described in the background technology, during the process of pressing the skin membrane, the left and right sides of the welding wire in the pressing device of the related technology are not well wrapped with the skin membrane, thereby forming a herringbone hollow area, which in turn leads to the problem of reduced product performance. The inventors have found that the reason for this problem is that the pressing device of the related technology has no welding wire embedded design, and thus cannot meet the process requirements.

[0023] Based on the above reasons, the present invention provides a mesh pressing device, which can achieve the skin membrane tightly wrapped around the outside of the welding wire, avoiding the appearance of a herringbone hollow area, thereby improving the product performance.

[0024] See also Figure 1 , Figure 1 A simplified structural diagram of a mesh pressing device according to an embodiment of the present application is shown, in which a mesh pressing device is prepared to press against a skin film 30. An embodiment of the present application provides a mesh pressing device, which includes a mesh pressing substrate 10. The mesh pressing substrate 10 is provided with a pressing surface 101 for pressing and holding the welding wire 20 and the skin film 30, and a plurality of grooves 102 arranged sequentially and spaced are formed on the pressing surface 101. Each groove 102 extends from one side of the mesh pressing substrate 10 to the other opposite side, and the groove 102 can accommodate the welding wire 20.

[0025] The skin membrane 30 in this embodiment includes, but is not limited to, a thermosetting film, a thermoplastic film, etc. that is fixed by heat shrinkage, and can be flexibly selected according to actual needs. Specifically, the skin membrane 30 is, for example, an EVA film or a POE film.

[0026] The above-mentioned pressing device optimizes the shape of the pressing surface 101 of the pressing substrate 10, and is specifically provided with a groove 102 capable of accommodating the welding wire 20. When in use, the pressing surface 101 of the pressing substrate 10 presses the skin film 30 and the welding wire 20, and the welding wire 20 can be embedded into the groove 102 and better wrapped by the skin film 30 under the action of the pressing force. At the same time, under the heating action of the heating table on the battery cell 40, the skin film 30 can be heat-shrinked and fixed to the outside of the welding wire 20. It can be seen that compared with the method without the groove 102, the skin films 30 on the opposite sides of the welding wire 20 can be more closely attached to the outer wall of the welding wire 20, achieving good physical contact, thereby avoiding the formation of a herringbone hollow area between the skin film 30 and the welding wire 20, thereby improving the electrical performance of the product.

[0027] In some specific embodiments, the coating process includes the following steps: the battery cell 40 is placed on the table of the heating table, a plurality of welding wires 20 are arranged on the upper surface of the battery cell 40, a skin film 30 is arranged above the welding wires 20, a pressing device in this embodiment is arranged above the skin film 30, and the pressing device is placed on the heating table, specifically, for example, the skin film 30 is pressed by its own gravity, and the welding wire 20 can be embedded in the groove 102 and wrapped by the skin film 30 under the action of the pressing force; in addition, a plurality of welding wires 20 are also arranged on the lower surface of the battery cell 40, and a skin film 30 is arranged below the plurality of welding wires 20. When the heating table is working, the skin film 30 above the battery cell 40 and the skin film 30 below the battery cell 40 are both contracted by heat, so that each welding wire 20 above the battery cell 40 can be connected and fixed to the upper surface of the battery cell 40 with the skin film 30, and each welding wire 20 below the battery cell 40 can be connected and fixed to the lower surface of the battery cell 40 with the skin film 30. Among them, the skin membrane 30 below the battery cell 40 is closer to the heating platform than the skin membrane 30 above the battery cell 40, so the skin membrane 30 below the battery cell 40 will be heated more evenly, and the welding wire 20 below the battery cell 40 can be well wrapped and fixed by the skin membrane 30, so that there is no need to configure a pressing device under the battery cell 40. In addition, a pressing device is provided above the battery cell 40, and the groove 102 design can effectively form a good wrapping effect between the skin membrane 30 and the welding wire 20; the groove 102 design can be compatible with various sizes of welding wires 20 and the skin membrane 30 to form a good wrapping effect, which can well improve the EL (photoelectric power generation) performance in the stringing stage, and at the same time, it can also avoid the film filling and wrapping effect after lamination.

[0028] See also Figure 1 In some embodiments, the cross-sectional profile of the groove 102 along its extension direction includes, but is not limited to, various regular shapes such as semicircle, semi-ellipse, polygon, and other irregular shapes, which can be flexibly adjusted and set according to actual needs. Among them, the polygon includes, but is not limited to, triangle, quadrilateral, pentagon, hexagon, etc.

[0029] See also Figure 1 In some embodiments, the inner wall of the groove 102 is adapted to the outer wall of the welding wire 20, so that the skin film 30 can be more closely attached to the opposite sides of the welding wire 20. In this embodiment, the cross-sectional profile of the welding wire 20 along its extension direction is set to be circular, elliptical or polygonal, and the cross-sectional profile of the groove 102 along its extension direction is correspondingly set to be semicircular, semi-elliptical or polygonal.

[0030] In one embodiment, all grooves 102 are arranged at equal intervals on the pressing surface 101. In this way, the grooves 102 are arranged corresponding to the welding wires 20 arranged at equal intervals, so that the welding wires 20 can be pressed synchronously.

[0031] See also Figures 2 to 4 , Figure 2 A structural diagram of a screen pressing device according to an embodiment of the present application is shown from one perspective. Figure 3 Another perspective structural diagram of the screen pressing device according to an embodiment of the present application is shown. Figure 4 Shows Figure 3 Enlarged structural diagram at A. In one embodiment, the pressed mesh substrate 10 includes a main body plate 11 and an abutting plate 12 connected to the main body plate 11. The abutting plate 12 is set as a non-metallic material plate, and the pressing surface 101 is set on the side of the abutting plate 12 facing away from the main body plate 11. In this way, the pressed mesh substrate 10 is pressed against the skin membrane 30 by the non-metallic material plate. Compared with the metal plate, the non-rigid material has a smaller degree of hidden cracks or destructive damage to the skin membrane 30, and the integrity of the skin membrane 30 is better, thereby improving the product quality.

[0032] In one embodiment, the main body plate 11 includes but is not limited to being set as a metal plate. In this way, the main body plate 11 has a large structural rigidity, which can improve the overall rigidity of the pressed mesh substrate 10.

[0033] The connection methods between the main plate 11 and the abutment plate 12 include but are not limited to bonding, clamping, welding or connecting with fasteners such as pins, rivets, screws, etc.

[0034] Of course, in some optional solutions, the main body plate 11 may also be made of non-metallic material.

[0035] See also Figures 2 to 4 In one embodiment, the pressing device further includes a moving frame 50. The moving frame 50 is connected to the pressing substrate 10. In this way, by driving the moving frame 50 to move, the pressing substrate 10 can be driven to move to a working position or a non-working position. Specifically, when the battery cell 40, the welding wire 20, and the skin membrane 30 are pulled to the preset position on the heating table, the moving frame 50 drives the pressing substrate 10 to move from the non-working position to the working position. At this time, the pressing substrate 10 is located directly above the skin membrane 30. The pressing substrate 10 presses against the skin membrane 30 under the action of its own gravity. When the heating table is heated, the skin membrane 30 and the welding wire 20 are connected and fixed to the battery cell 40; when the skin membrane 30 and the welding wire 20 are fixed to the battery cell 40, the moving frame 50 drives the pressing substrate 10 to move to the non-working position.

[0036] See also Figures 2 to 4In one embodiment, magnetic suction members 60 are respectively provided at opposite ends of the movable frame 50. Both magnetic suction members 60 are used to cooperate with the electromagnets by magnetic attraction. In this way, by energizing and de-energizing the electromagnets, when energized, for example, the magnetic suction member 60 is attracted and pulled, the movable frame 50 can be driven to move, so that the pressing net substrate 10 can be switched and adjusted between the working position and the non-working position. Specifically, the two magnetic suction members 60 are respectively configured as the first magnetic suction member and the second magnetic suction member, and the two electromagnets corresponding to the two magnetic suction members 60 are respectively configured as the first electromagnet and the second electromagnet. When the first electromagnet is energized and the second electromagnet is de-energized, the first electromagnet attracts and pulls the first magnetic suction member to drive the pressing net substrate 10 to move, and switches from the non-working position to the working position; when the first electromagnet is de-energized and the second electromagnet is energized, the second electromagnet attracts and pulls the second magnetic suction member to drive the pressing net substrate 10 to move, and switches from the working position to the non-working position.

[0037] In some embodiments, the magnetic attraction member 60 includes but is not limited to a magnet, an iron material or other magnetic material that can be attracted by an electromagnet.

[0038] See also Figures 2 to 4 In one embodiment, the movable frame 50 includes a connecting portion 51 connected to the press-mesh substrate 10 and two mounting portions 52 respectively disposed at opposite ends of the connecting portion 51 , and two magnetic suction members 60 are respectively mounted on the two mounting portions 52 .

[0039] Specifically, the mounting portion 52 is provided with a mounting opening, and the magnetic attraction member 60 is embedded in the mounting opening.

[0040] It should be noted that the "installing portion 52" can be "a part of the connecting portion 51", that is, the "installing portion 52" and the "other portions of the connecting portion 51" are manufactured as one piece; it can also be an independent component separable from the "other portions of the connecting portion 51", that is, the "installing portion 52" can be manufactured independently and then combined with the "other portions of the connecting portion 51" into a whole.

[0041] In some embodiments, the movable frame 50 includes but is not limited to a metal frame or a non-metal frame, and can be flexibly adjusted and configured according to actual needs.

[0042] In some embodiments, the connection portion 51 includes but is not limited to being set as a hollow structure, which can save materials and reduce material costs.

[0043] See also Figures 2 to 4In one embodiment, a plurality of hollow holes 103 are provided on the press-fit substrate 10. Thus, on the one hand, the more the number of hollow holes 103, the smaller the contact area between the press-fit substrate 10 and the skin film 30, and after the skin film 30 is pressed against the welding wire 20, the press-fit substrate 10 will not lift up the skin film 30; on the other hand, the more the number of hollow holes 103, the more material can be saved.

[0044] See also Figures 2 to 4 In one embodiment, each hollow hole 103 includes but is not limited to a circular hole, an elliptical hole or a polygonal hole.

[0045] In one embodiment, the hollow holes 103 are arranged in an array, for example.

[0046] In one embodiment, the hollow hole 103 may be a hole that penetrates two opposite side surfaces of the pressed mesh substrate 10 , or may be a blind hole that is disposed on the pressed mesh substrate 10 .

[0047] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, if the terms "first" or "second" appear, these terms 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A screen pressing device, characterized in that: The screen pressing device comprises: A pressing mesh substrate (10), wherein the pressing mesh substrate (10) is provided with a pressing surface (101) for pressing a welding wire (20) and a skin membrane (30), wherein the pressing surface (101) is provided with a plurality of grooves (102) arranged in sequence and spaced apart from each other, wherein each of the grooves (102) extends from one side of the pressing mesh substrate (10) to the other opposite side, and wherein the grooves (102) are capable of accommodating the welding wire (20).

2. The screen pressing device according to claim 1, characterized in that: The cross-sectional profile of the groove (102) along its extension direction is semicircular, semi-elliptical or polygonal.

3. The screen pressing device according to claim 1, characterized in that: All the grooves (102) are arranged at equal intervals on the pressing surface (101).

4. The screen pressing device according to claim 1, characterized in that: The pressed mesh substrate (10) comprises a main body plate (11) and an abutment plate (12) connected to the main body plate (11); the abutment plate (12) is configured as a non-metallic material plate; and the abutment surface (101) is configured on a side of the abutment plate (12) facing away from the main body plate (11).

5. The screen pressing device according to claim 4, characterized in that: The main body plate (11) is configured as a metal plate.

6. The screen pressing device according to claim 1, characterized in that: The mesh pressing device further comprises a movable frame (50), wherein the movable frame (50) is connected to the mesh pressing substrate (10).

7. The screen pressing device according to claim 6, characterized in that: Magnetic attracting members (60) are respectively provided at opposite ends of the movable frame (50), and the two magnetic attracting members (60) are both used for magnetically cooperating with the electromagnet.

8. The screen pressing device according to claim 7, characterized in that: The movable frame (50) comprises a connecting portion (51) connected to the press mesh substrate (10) and two mounting portions (52) respectively arranged at opposite ends of the connecting portion (51), and the two magnetic suction members (60) are respectively correspondingly mounted on the two mounting portions (52).

9. The screen pressing device according to claim 1, characterized in that: The pressed mesh substrate (10) is provided with a plurality of hollow holes (103).

10. The screen pressing device according to claim 9, characterized in that: Each of the hollow holes (103) is configured as a circular hole, an elliptical hole or a polygonal hole; the hollow holes (103) are arranged in an array; and the hollow holes (103) penetrate two opposite side surfaces of the pressed mesh substrate (10).

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