Glue printing screen, glue printing mechanism and battery string glue printing equipment

Abstract

The utility model discloses a glue printing screen, a glue printing mechanism and battery string glue printing equipment, the glue printing screen comprises an outer frame and a glue printing plate, and the glue printing plate is mounted on the outer frame; a glue printing area and a protruding area are arranged on the bottom face of the glue printing plate at intervals in the first direction, a plurality of rows of meshes penetrating through the glue printing plate are formed in the glue printing area, and each row of meshes are arranged in the first direction. A plurality of first protruding parts protruding out of the bottom face of the glue printing plate are arranged in the protruding area, and all the first protruding parts and the extension lines where all the rows of meshes are located are arranged in a staggered mode. According to the glue printing screen printing plate, when glue printing is carried out on the second battery piece of the battery string through the glue printing plate, the first protruding part can abut against the first battery piece, and the first battery piece is the battery piece which is adjacent to the second battery piece and is subjected to glue printing on the battery string, so that a gap is formed between the bottom face of the glue printing plate and the first battery piece; and therefore, the bottom surface of the glue printing plate is prevented from rubbing the uncured glue on the first battery piece, and the glue printing quality of the battery pieces is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cell assembly production, and in particular to a printing glue screen, a printing glue mechanism, and a cell string printing glue device. Background Art

[0002] After multiple battery cells are serially soldered to the solder ribbons, in order to ensure a reliable connection between the solder ribbons and the battery cells, it is usually necessary to print glue on the solder ribbons using a glue printing device. After the glue cures, the solder ribbons are bonded and fixed to the surface of the battery cells.

[0003] In the existing glue printing device, when printing glue, the first battery cell is moved forward after the glue printing is completed, and the second battery cell is moved to the glue printing station for glue printing. When the glue printing screen is printing glue on the second battery cell, the glue printing screen will be squeezed and deformed by the scraper, and the glue printing screen will come into contact with the glue on the first battery cell for the second time. At this time, the glue on the first battery cell has not yet solidified, causing the glue on the first battery cell to be rubbed to the bottom of the glue printing screen, affecting the glue printing quality of the battery cell; and after the glue rubbed on the bottom surface of the glue printing screen is cured by heat or light, there is also a risk of cracking the battery cell in the subsequent glue printing process. Utility Model Content

[0004] The purpose of the present application is to provide a printing screen to solve the problem that the printing screen of the existing glue application device will rub the glue during printing; in addition, another purpose of the present application is to provide a printing mechanism including the printing screen and a battery string printing device including the printing mechanism.

[0005] To achieve this goal, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a printing offset screen, which includes a printing offset plate, wherein:

[0007] The bottom surface of the printing plate is provided with a printing area and a raised area spaced apart along a first direction. The printing area is provided with a plurality of rows of mesh holes penetrating the printing plate, and each row of mesh holes is arranged along the first direction.

[0008] A plurality of first protrusions protruding from the bottom surface of the printing plate are arranged in the protrusion area, and each first protrusion is staggered with the extension line of each row of mesh holes.

[0009] The printing screen proposed in the present application is provided with a plurality of first protrusions on the printing plate. When the printing plate is printing glue on the second cell of the battery string, the first protrusions will abut against the first cell of the battery string. The first cell is the cell adjacent to the second cell in the battery string and has been printed with glue. Since the first protrusions are staggered with the extension lines of the rows of mesh holes, the first protrusions will avoid the glue points on the first cell, so that a gap is formed between the bottom surface of the printing plate and the first cell, thereby preventing the bottom surface of the printing plate from rubbing against the uncured glue on the first cell, thereby ensuring the quality of the glue printing on the cell and greatly improving the yield rate of photovoltaic cell modules.

[0010] Optionally, the plurality of first protrusions are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

[0011] By arranging the plurality of first protrusions at intervals along the second direction, a gap is formed between the bottom surface of the printed rubber plate and the first battery cell in the second direction. The layout is reasonable, and the risk of the bottom surface of the printed rubber plate rubbing against the glue on the first battery cell is further reduced.

[0012] Optionally, the first protrusion is a continuous long rib extending along the first direction;

[0013] Alternatively, the first protrusion is a plurality of short ribs spaced apart along the first direction;

[0014] Alternatively, the first protrusion is a plurality of first protrusions spaced apart along the first direction.

[0015] By configuring the first protrusion as a continuous long rib extending along the first direction, or a plurality of short ribs spaced apart along the first direction, or a plurality of first bumps spaced apart along the first direction, three first protrusions with different structures are provided.

[0016] Optionally, the printing screen further includes an outer frame, a gauze and a bonding portion, wherein:

[0017] The bonding portion is configured to bond the edge of the gauze to the bottom surface of the outer frame and to bond the edge of the printing plate to the bottom surface of the gauze;

[0018] The printing plate is provided with a plurality of glue filling holes at least on one side of the raised area away from the printing area, and the glue of the adhesive portion is filled in the glue filling holes to increase the contact area between the adhesive portion and the printing plate.

[0019] The printing rubber plate is connected to the outer frame through the gauze, and the gauze is bonded to the printing rubber plate and the outer frame respectively through the bonding part, i.e., glue; by providing a plurality of glue filling holes on the side of the raised area away from the printing rubber area on the printing rubber plate, the contact area between the glue, the gauze and the printing rubber plate is increased, thereby improving the bonding strength between the gauze and the printing rubber plate.

[0020] Optionally, at least one circle of glue filling holes is provided at the edge of the printing rubber plate, and the printing rubber area and the raised area are located within the area surrounded by the glue filling holes.

[0021] By arranging at least one circle of glue filling holes at the edge of the printing plate, the contact area between the glue, the gauze and the printing plate is further increased, and the bonding strength between the gauze and the printing plate is further improved.

[0022] Optionally, the bonding portion includes an outer bonding portion and an inner bonding portion, wherein:

[0023] The outer bonding part is located at the junction of the edge of the printing plate and the gauze. The bottom surface of the printing plate is lower than the outer bonding part. The glue of the outer bonding part flows to the edge of the printing plate and penetrates the gauze and flows to the bottom surface of the outer frame, so as to bond the printing plate, the gauze and the outer frame into one.

[0024] The inner bonding part is located at the junction of the inner side wall of the outer frame and the gauze, and the inner bonding part covers the glue filling hole. The glue of the inner bonding part flows to the inner side wall of the outer frame and penetrates the gauze to flow to the top surface of the printing plate and the glue filling hole, so as to bond the printing plate, the gauze and the outer frame into one.

[0025] By setting the external bonding part and the internal bonding part, the bottom surface of the outer frame, the gauze and the edge of the printing plate are bonded and fixed, as well as the inner side wall of the outer frame, the gauze and the top surface of the printing plate are bonded and fixed, ensuring the reliability of the bonding and fixation of the printing plate, the gauze and the outer frame.

[0026] Optionally, a second raised portion located in the rubber printing area is provided on the bottom surface of the rubber printing plate, and each mesh hole passes through the rubber printing plate and the second raised portion.

[0027] By providing a second protrusion on the bottom surface of the printing plate, when the printing plate abuts against the second battery cell of the battery string to print glue on the second battery cell, a certain gap exists between the printing plate and the first battery cell, thereby preventing the printing plate from abutting against the first battery cell, thereby preventing uncured glue on the first battery cell from adhering to the printing plate, and ensuring the printing quality of the printing screen.

[0028] Optionally, the second raised portion includes a plurality of second protrusions arranged in an array, and each second protrusion is provided with at least one mesh hole.

[0029] By configuring the second raised portion to include a plurality of second protrusions arranged in an array, and providing at least one mesh hole on each second protrusion, a gap is formed between the bottom surface of the printing plate and the first cell when printing glue on the second cell panel, while reducing the contact area between the second raised portion and the second cell panel, thereby reducing the risk of the second raised portion crushing the second cell panel; and the second protrusions can also play a reinforcing role, which can reduce to a certain extent the deformation of the scraper assembly when pressing the screen, which is conducive to ensuring the overall uniformity of the printing glue on the printing screen.

[0030] Optionally, the plurality of second bumps may be divided into a first end bump region, an intermediate bump region, and a second end bump region along the second direction, the first end bump region including a column of second bumps, the intermediate bump region including a plurality of columns of second bumps, and the second end bump region including a column of second bumps, each column of second bumps being arranged along the first direction;

[0031] The second bumps in two adjacent columns in the middle bump area are arranged alternately.

[0032] By staggering the second bumps in two adjacent columns in the middle bump area, the number of glue points can be reduced while taking into account the reliability of the connection between the battery cell and the soldering ribbon, thereby reducing the amount of glue used.

[0033] Optionally, two mesh holes are arranged on each second bump in the second end bump area at intervals along the second direction, and the spacing between the two mesh holes on each second bump in the second end bump area is smaller than the column spacing between the second bumps in each column in the middle bump area.

[0034] By setting the spacing between the two mesh holes on each second bump in the second end bump area to be smaller than the column spacing between the second bumps in each column of the middle bump area, two columns of glue points with smaller spacing are formed at the corresponding positions of the second battery cell, thereby improving the connection strength between the welding strip on the second battery cell corresponding to the second end bump area and the battery cell.

[0035] Optionally, the length of the first protrusion is not less than 15 mm.

[0036] By providing the first raised portion, a gap of not less than 15 mm in length is formed along the first direction between the printing plate and the first cell when the printing plate prints glue on the second cell of the battery string, further ensuring that the bottom surface of the printing plate does not rub against uncured glue on the first cell.

[0037] In a second aspect, the present application further proposes a rubber printing mechanism, which includes a scraper assembly and the above-mentioned rubber printing screen, wherein:

[0038] The scraper assembly is arranged above the printing screen, and the scraper assembly includes a drive assembly and a scraper. The drive end of the drive assembly is connected to the scraper, and the drive assembly is configured to drive the scraper to rise and fall and move laterally;

[0039] The drive assembly drives the scraper to descend and press against the printing board and then move horizontally to scrape the glue on the printing board into the mesh. The glue flows through the mesh to the solder strip to be printed and the surface of the battery cell.

[0040] Through the cooperation of the scraper assembly and the printing screen, automatic printing of glue on the battery cell is realized; at the same time, when the printing screen is printing glue, the bottom surface of the printing plate will not rub against the uncured glue on the first battery cell, ensuring the printing quality of the glue printing mechanism.

[0041] In a third aspect, the present application further proposes a battery string glue printing device, which includes a battery string conveying mechanism, a first glue printing mechanism, a first curing mechanism, a flipping mechanism, a second glue printing mechanism, and a second curing mechanism, wherein the first glue printing mechanism and the second glue printing mechanism are both the above-mentioned glue printing mechanisms, wherein:

[0042] A first glue printing station, a first curing station, a flipping station, a second glue printing station, and a second curing station are sequentially arranged on a conveying path of the battery string conveying mechanism. The battery string conveying mechanism is configured to convey the battery string in a stepwise manner along the second direction.

[0043] The first glue printing mechanism is arranged above the first glue printing station, and is configured to print glue on the front surface of the battery cell passing through the first glue printing station;

[0044] The first curing mechanism is disposed at the first curing station, and is configured to cure the glue points on the front surface of the battery cell passing through the first curing station;

[0045] The flipping mechanism is provided at the flipping station, and is configured to flip the battery string cured by the first curing mechanism at the flipping station so that the back sides of all battery cells in the battery string face upwards;

[0046] The second glue printing mechanism is arranged above the second glue printing station, and is configured to print glue on the back side of the battery cell passing through the second glue printing station;

[0047] The second curing mechanism is disposed at the second curing station, and the second curing station is configured to cure the glue spots on the back side of the battery cell passing through the second curing station.

[0048] Through the cooperation of the battery string conveying mechanism, the first glue printing mechanism, the first curing mechanism, the flipping mechanism, the second glue printing mechanism and the second curing mechanism, automatic double-sided glue printing and curing of the battery string is achieved; at the same time, when the glue printing screens of the first glue printing mechanism and the second glue printing mechanism are printing glue, the bottom surface of the glue printing plate will not rub against the uncured glue on the first battery cell, thereby ensuring the glue printing quality of the battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the three-dimensional structure of the printing offset screen provided in the embodiment of the present application;

[0050] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0051] Figure 3 This is a schematic diagram of the structure of the gauze bonding and fixing of the printing offset screen provided in an embodiment of the present application;

[0052] Figure 4This is a partially enlarged schematic diagram of the glue filling holes of the glue printing screen provided in an embodiment of the present application;

[0053] Figure 5 It is a structural schematic diagram of the printing area and the raised area of ​​the printing screen provided in an embodiment of the present application.

[0054] Figures 1 to 5 The following reference numerals are included:

[0055] Outer frame 10;

[0056] Printing board 20: printing area 21, raised area 22, mesh 23, first raised portion 24, long rib 240, glue filling hole 25, second raised portion 26, second bump 260, first end bump area 27, middle bump area 28, second end bump area 29;

[0057] Gauze 30;

[0058] Adhesive portion 40 : outer adhesive portion 41 and inner adhesive portion 42 . DETAILED DESCRIPTION

[0059] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0060] After multiple battery cells are serially soldered to the solder ribbons, in order to ensure a reliable connection between the solder ribbons and the battery cells, it is usually necessary to print glue on the solder ribbons using a glue printing device. After the glue cures, the solder ribbons are bonded and fixed to the surface of the battery cells.

[0061] In the existing glue printing device, when printing glue, the first battery cell is moved forward after the glue printing is completed, and the second battery cell is moved to the glue printing station for glue printing. When the glue printing screen is printing glue on the second battery cell, the glue printing screen will be squeezed and deformed by the scraper, and the glue printing screen will come into contact with the glue on the first battery cell for the second time. At this time, the glue on the first battery cell has not yet solidified, causing the glue on the first battery cell to be rubbed to the bottom of the glue printing screen, affecting the glue printing quality of the battery cell; and after the glue rubbed on the bottom surface of the glue printing screen is cured by heat or light, there is also a risk of cracking the battery cell in the subsequent glue printing process.

[0062] Therefore, in the first aspect, the present application proposes a printing glue screen for printing glue on the battery cells of the battery string, see Figure 1 and Figure 2 As shown, the printing screen provided in the embodiment of the present application includes a printing plate 20; the bottom surface of the printing plate 20 is provided with a first direction ( Figure 1In the embodiment, the printing plate 20 includes a plurality of first protrusions 24 protruding from the bottom surface of the printing plate 20, and each first protrusion 24 is staggered with an extension line of each row of mesh holes 23.

[0063] For the convenience of description, the battery cell currently to be printed with glue corresponding to the printing plate 20 is marked as the second battery cell, and the battery cell adjacent to the second battery cell and already printed with glue is marked as the first battery cell. The second battery cell is converted into the first battery cell after being printed with glue on the printing plate 20. The size of the glue printing area 21 matches the size of each battery cell in the battery string.

[0064] Specifically, the glue on the printing plate 20 flows through the mesh 23 to the soldering ribbon and the surface of the second cell to form multiple rows of glue spots on the surface of the second cell. The first direction is the extension direction of the soldering ribbon on the second cell.

[0065] Specifically, while the printing plate 20 is printing glue on the second battery cell of the battery string, the first protrusions 24 will abut against the first battery cell of the battery string. Each first protrusion 24 is staggered with the extension line of each row of mesh holes 23, so that each first protrusion 24 is staggered with each row of glue points formed on the first battery cell to avoid contact between the first protrusion 24 and the glue points on the first battery cell.

[0066] The printing plate 20 of the printing screen proposed in this application is provided with a plurality of first protrusions 24. When the printing plate 20 prints glue on the second cell of the battery string, the first protrusions 24 will abut against the first cell of the battery string, so that a gap is formed between the bottom surface of the printing plate 20 and the first cell, thereby preventing the bottom surface of the printing plate 20 from rubbing against the uncured glue on the first cell, thereby ensuring the quality of the glue printing on the cell and greatly improving the yield rate of the photovoltaic cell module.

[0067] As an embodiment, the plurality of first protrusions 24 are arranged along the second direction ( Figure 1 The second direction is perpendicular to the first direction.

[0068] By arranging the plurality of first protrusions 24 at intervals along the second direction, a gap is formed between the bottom surface of the printing plate 20 and the first battery cell in the second direction. This reasonable layout further reduces the risk of the bottom surface of the printing plate 20 rubbing against the glue on the first battery cell.

[0069] As an embodiment, the first protrusion 24 is a continuous long rib 240 extending along the first direction.

[0070] By configuring the first raised portion 24 as a continuous long rib 240 extending along the first direction, a gap is formed between the bottom surface of the printing plate 20 and the first battery cell when printing the glue, and a first raised portion 24 with a simple structure and easy processing is provided; the long rib 240 also plays a reinforcing role, which can reduce the deformation of the scraper assembly when pressing the screen to a certain extent, which helps to reduce the risk of the bottom surface of the printing plate 20 rubbing against the glue on the first battery cell.

[0071] As an embodiment, the first protrusions 24 are a plurality of short ribs spaced apart along the first direction.

[0072] By configuring the first raised portion 24 as a plurality of short ribs spaced apart along the first direction, a gap is formed between the bottom surface of the printing plate 20 and the first battery cell during printing, while reducing the contact area between the first raised portion 24 and the first battery cell, thereby reducing the risk of the first raised portion 24 crushing the first battery cell. Furthermore, the short ribs can also play a reinforcing role, which can reduce, to a certain extent, the deformation of the scraper assembly when pressing the screen, thereby reducing the risk of the bottom surface of the printing plate 20 rubbing against the glue on the first battery cell.

[0073] As an embodiment, the first protrusions 24 are a plurality of first protrusions spaced apart along the first direction.

[0074] By configuring the first raised portion 24 as a plurality of first protrusions spaced apart along the first direction, a gap is formed between the bottom surface of the printing plate 20 and the first battery cell during printing, while reducing the contact area between the first raised portion 24 and the first battery cell, thereby reducing the risk of the first raised portion 24 crushing the first battery cell. Furthermore, the first protrusions can also play a reinforcing role, which can reduce, to a certain extent, the deformation of the scraper assembly when pressing the screen, thereby reducing the risk of the bottom surface of the printing plate 20 rubbing against the glue on the first battery cell.

[0075] See also Figure 1 、 Figure 3 and Figure 4 As shown, as an embodiment, the printing screen further includes an outer frame 10, a gauze 30 and a bonding portion 40. The bonding portion 40 is configured to bond the edge of the gauze 30 to the bottom surface of the outer frame 10 and to bond the edge of the printing plate 20 to the bottom surface of the gauze 30. The printing plate 20 is provided with a plurality of glue filling holes 25 on at least one side of the raised area 22 away from the printing area 21. The glue of the bonding portion 40 is filled in the glue filling holes 25 to increase the contact area between the bonding portion 40 and the printing plate 20.

[0076] The rubber sheet 20 is connected to the outer frame 10 via a gauze 30. The gauze 30 is bonded to the rubber sheet 20 and outer frame 10 respectively via adhesive portions 40, i.e., glue. The provision of adhesive portions 40 allows the edges of the gauze 30 to be bonded and fixed to the bottom surface of the outer frame 10 and the edges of the rubber sheet 20. The provision of multiple glue-filling holes 25 on the rubber sheet 20, at least on the side of the raised region 22 facing away from the rubber-printed region 21, increases the contact area between the glue, the gauze 30, and the rubber sheet 20, thereby improving the bonding strength between the gauze 30 and the rubber sheet 20.

[0077] The existing printing screen does not have glue filling holes. To ensure the strength of the gauze and the printing plate, glue is applied to one side and the bottom edge of the printing plate. After the glue at the bottom edge of the printing plate solidifies, there is a risk that the glue at the bottom edge of the printing plate will rub against the glue on the first battery cell during the gluing process. Therefore, the present application makes an improvement by adding glue filling holes 25 to the printing plate 20 at least on the side of the raised area 22 away from the printing area 21. This can ensure the bonding strength between the gauze 30 and the printing plate 20 at this location, and no glue is required at least on the bottom edge of the printing plate on the side away from the printing area 21. The reason why the printing plate 20 is limited to having multiple glue filling holes 25 on at least the side of the raised area 22 away from the printing area 21 is because when gluing, the printing plate area on the side of the raised area 22 away from the printing area 21 is located above the first battery cell, which poses a risk of glue rubbing.

[0078] As an embodiment, at least one circle of glue filling holes 25 is provided at the edge of the printing rubber plate 20 , and the printing rubber area 21 and the raised area 22 are located within the area surrounded by the glue filling holes 25 .

[0079] Specifically, two circles of glue filling holes 25 are arranged at intervals on the edge of the printing plate 20 .

[0080] By providing at least one circle of glue filling holes 25 at the edge of the printing plate 20 , the contact area between the glue, the gauze 30 and the printing plate 20 is further increased, thereby further improving the bonding strength between the gauze 30 and the printing plate 20 .

[0081] As an embodiment, the bonding portion 40 includes an external bonding portion 41 and an internal bonding portion 42. The external bonding portion 41 is located at the junction of the edge of the printing plate 20 and the gauze 30. The bottom surface of the printing plate 20 is lower than the external bonding portion 41. The glue of the external bonding portion 41 flows to the edge of the printing plate 20 and penetrates the gauze 30 and flows to the bottom surface of the outer frame 10, so as to bond the printing plate 20, the gauze 30 and the outer frame 10 as one. The internal bonding portion 42 is located at the junction of the inner side wall of the outer frame 10 and the gauze 30. The internal bonding portion 42 covers the glue filling hole 25. The glue of the internal bonding portion 42 flows to the inner side wall of the outer frame 10 and penetrates the gauze 30 and flows to the top surface of the printing plate 20 and the glue filling hole 25, so as to bond the printing plate 20, the gauze 30 and the outer frame 10 as one.

[0082] By providing the outer bonding portion 41 and the inner bonding portion 42, the bottom surface of the outer frame 10, the gauze 30 and the edge of the printing plate 20 are bonded and fixed, as well as the inner side wall of the outer frame 10, the gauze 30 and the top surface of the printing plate 20 are bonded and fixed, thereby ensuring the reliability of the bonding and fixing of the printing plate 20, the gauze 30 and the outer frame 10.

[0083] See also Figure 1 and Figure 5 As shown, as an embodiment, a second raised portion 26 located in the rubber printing area 21 is provided on the bottom surface of the rubber printing plate 20 , and each mesh hole 23 passes through the rubber printing plate 20 and the second raised portion 26 .

[0084] By providing the second raised portion 26 on the bottom surface of the printing plate 20, when the printing plate 20 prints glue on the second battery cell, a gap approximately equal to the second raised portion 26 exists between the printing plate 20 and the first battery cell. This prevents the printing plate 20 from abutting the first battery cell, thereby preventing uncured glue on the first battery cell from adhering to the printing plate 20, thereby ensuring the printing quality of the printing screen.

[0085] As an embodiment, the second protruding portion 26 includes a plurality of second protrusions 260 arranged in an array, and each second protrusion 260 is provided with at least one mesh 23 .

[0086] By configuring the second raised portion 26 to include a plurality of second protrusions 260 arranged in an array, with at least one mesh hole 23 provided on each second protrusion 260, a gap is formed between the bottom surface of the printing plate 20 and the first cell when printing glue on the second cell panel, while reducing the contact area between the second raised portion 26 and the second cell panel, thereby reducing the risk of the second raised portion 26 crushing the second cell panel; and the second protrusion 25 can also play a reinforcing role, which can reduce, to a certain extent, the deformation of the scraper assembly when pressing the screen, which is conducive to ensuring the overall uniformity of the printing glue on the printing screen.

[0087] As an embodiment, multiple second bumps 260 can be divided into a first end bump area 27, an intermediate bump area 28 and a second end bump area 29 along the second direction, the first end bump area 27 includes a column of second bumps 260, the intermediate bump area 28 includes multiple columns of second bumps 260, the second end bump area 29 includes a column of second bumps 260, and each column of second bumps 260 is arranged along the first direction; the adjacent two columns of second bumps 260 in the intermediate bump area 28 are staggered.

[0088] By staggering the second bumps 260 in two adjacent columns in the middle bump area 28 , the number of glue points can be reduced while ensuring the reliability of the connection between the battery cell and the soldering ribbon, thereby reducing the amount of glue used.

[0089] As an embodiment, two mesh holes 23 are arranged on each second bump 260 in the second end bump area 29 at intervals along the second direction, and the spacing between the two mesh holes 23 on each second bump 260 in the second end bump area 29 is smaller than the column spacing between the second bumps 260 in each column of the middle bump area 28.

[0090] By setting the spacing between the two mesh holes 23 on each second bump 260 in the second end bump area 29 to be smaller than the column spacing between the second bumps 260 in each column of the middle bump area 28, two columns of glue points with smaller spacing are formed at the corresponding positions of the second battery cell, thereby improving the connection strength between the welding strip on the second battery cell corresponding to the second end bump area 29 and the battery cell.

[0091] The following example describes the specific adhesive application locations for the second-end bump region 115. The first and second cells in a cell string are connected via multiple, side-by-side solder ribbons, with the first half of the solder ribbon welded to the top surface of the first cell, and the second half welded to the bottom surface of the second cell. Because the first and second cells are prone to misalignment during transfer, the first end of the first half of the solder ribbon should be reinforced when applying glue to the front of the cell string. Since the first end of the first half of the solder ribbon is adjacent to the end of the second cell, the second-end bump region 115 can be used to apply two tight adhesive points to the first end of the first half of the solder ribbon for reinforcement, ensuring a secure connection between the first end of the first half of the solder ribbon and the first cell after curing.

[0092] As an embodiment, the length of the first protrusion 24 is not less than 15 mm.

[0093] The upper limit of the length of the first protrusion 24 is the point where the first protrusion 24 extends to the bottom edge of the printing plate 20. By limiting the lower limit of the length of the first protrusion 24, it is ensured that the first protrusion 24 provides sufficient support for the printing plate 20, thereby further preventing the bottom surface of the printing plate 20 from rubbing against the uncured glue on the first battery cell.

[0094] As an embodiment, the mesh 23 is any one of a long hole, a round hole, a square hole or a special-shaped hole.

[0095] Specifically, the mesh 23 is a rectangular hole or a waist-shaped hole.

[0096] By setting the mesh 23 to be any of long holes, round holes, square holes or special-shaped holes, a variety of mesh 23 structures that are easy to process are provided.

[0097] Please refer to Figure 1 As shown, as an embodiment, the height of the second protrusion 26 is 0.1 mm to 0.5 mm.

[0098] Specifically, the height of the second protrusion 26 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0099] The offset printing screen proposed in this embodiment has the following advantages compared with the prior art:

[0100] 1) The printing plate is provided with a plurality of first protrusions. When the printing plate is printing glue on the second cell of the battery string, the first protrusions will abut against the first cell of the battery string, so that a certain gap is formed between the printing plate and the first cell. This prevents the uncured glue on the first cell from adhering to the printing plate, thereby ensuring the printing quality of the printing screen and greatly improving the yield rate of photovoltaic cell modules.

[0101] 2) The first raised portion is a continuous long rib, a plurality of short ribs or a plurality of first bumps extending along the first direction, which has a simple structure and is easy to process; it also plays a reinforcing role, and can to a certain extent reduce the deformation when the scraper assembly presses the screen, which is beneficial to reduce the risk of the bottom surface of the printing plate rubbing against the uncured glue on the first battery cell.

[0102] 3) The printing plate is provided with glue filling holes to improve the bonding strength between the gauze and the printing plate.

[0103] 4) The bonding part includes an outer bonding part and an inner bonding part, which ensures the reliability of bonding and fixing of the printing plate, the gauze and the outer frame.

[0104] 5) The second raised portion includes a plurality of second protrusions arranged in an array, each second protrusion being provided with at least one mesh hole. When the printing plate is printing glue on the second battery cell of the battery string, a gap is formed between the bottom surface of the printing plate and the first battery cell, thereby reducing the contact area between the second protrusion and the second battery cell and reducing the risk of the second protrusion crushing the second battery cell. In addition, the second protrusions can also play a reinforcing role, which can reduce the deformation of the scraper assembly when pressing the screen to a certain extent, which is conducive to ensuring the overall uniformity of the printing glue on the printing screen.

[0105] 6) The second bumps in two adjacent columns in the middle bump area are staggered, which can reduce the number of glue points and thus reduce the amount of glue used while taking into account the reliability of the connection between the battery cell and the solder ribbon.

[0106] 7) The second end bump area includes two rows of second bumps, which can apply two rows of glue dots with a smaller row spacing on the second battery cell corresponding to the second end bump area, thereby improving the connection strength between the welding strip on the second battery cell corresponding to the second end bump area and the battery cell.

[0107] Second, see Figure 1As shown, the embodiment of the present application also proposes a glue printing mechanism, which includes a scraper assembly and the above-mentioned glue printing screen, the scraper assembly is arranged above the glue printing screen, the scraper assembly includes a drive assembly and a scraper, the drive end of the drive assembly is connected to the scraper, and the drive assembly is configured to drive the scraper to rise and fall and move laterally; the drive assembly drives the scraper to descend and press against the glue printing plate and then move laterally to scrape the glue on the glue printing plate into the mesh, and the glue flows through the mesh to the solder strip to be printed and the surface of the battery cell.

[0108] The collaboration between the scraper assembly and the printing screen allows for automatic glue application to the cell. Furthermore, when the printing screen applies glue to the second cell, the bottom surface of the printing plate 20 of the printing screen prevents it from rubbing against any uncured glue on the first cell, ensuring high-quality glue application. The scraper assembly is an existing device, so its detailed structure is not described here.

[0109] Thirdly, please refer to Figure 1 As shown, the embodiment of the present application further proposes a battery string glue printing device, which includes a battery string conveying mechanism, a first glue printing mechanism, a first curing mechanism, a flipping mechanism, a second glue printing mechanism and a second curing mechanism, the first glue printing mechanism and the second glue printing mechanism are both the above-mentioned glue printing mechanisms, wherein: the conveying path of the battery string conveying mechanism is sequentially provided with a first glue printing station, a first curing station, a flipping station, a second glue printing station and a second curing station, the battery string conveying mechanism is configured to convey the battery string in a stepwise manner along the second direction; the first glue printing mechanism is arranged above the first glue printing station, and the first glue printing mechanism is configured to perform glue printing on the front side of the battery cell passing through the first glue printing station ; The first curing mechanism is arranged at the first curing station, and the first curing mechanism is configured to cure the glue spots on the front side of the battery cell that has passed the first curing station; the flipping mechanism is arranged at the flipping station, and the flipping mechanism is configured to flip the battery string that has been cured by the first curing mechanism at the flipping station, so that the back sides of all battery cells in the battery string face upward; the second glue printing mechanism is arranged above the second glue printing station, and the second glue printing mechanism is configured to print glue on the back side of the battery cell that has passed the second glue printing station; the second curing mechanism is arranged at the second curing station, and the second curing station is configured to cure the glue spots on the back side of the battery cell that has passed the second curing station.

[0110] Through the cooperation of the battery string conveying mechanism, the first glue printing mechanism, the first curing mechanism, the flipping mechanism, the second glue printing mechanism and the second curing mechanism, automatic double-sided glue printing and curing of the battery string is achieved; at the same time, when the glue printing screens of the first glue printing mechanism and the second glue printing mechanism are printing glue, the bottom surface of the glue printing plate 20 will not rub against the uncured glue on the first battery cell, thereby ensuring the glue printing quality of the battery string.

[0111] In this application, the battery string conveying mechanism is the conveying line, and the first curing mechanism, the flipping mechanism and the second curing mechanism are all existing equipment, so the specific structure will not be described in detail here.

[0112] The above embodiments merely illustrate the basic principles and features of the present application. The present application is not limited by the above examples. Various changes and modifications may be made to the present application without departing from the spirit and scope of the present application. Such changes and modifications are intended to fall within the scope of the present application. The scope of protection claimed in the present application is defined by the appended claims and their equivalents.

Claims

1. A printing offset screen, characterized in that: The printing offset screen comprises a printing offset plate, wherein: The bottom surface of the printing plate is provided with a printing area and a raised area spaced apart along a first direction, the printing area is provided with a plurality of rows of mesh holes penetrating the printing plate, and each row of mesh holes is arranged along the first direction; A plurality of first protrusions protruding from the bottom surface of the printing plate are provided in the protrusion area, and each of the first protrusions is staggered with respect to an extension line of each row of mesh holes.

2. The printing offset screen according to claim 1, characterized in that: The plurality of first protrusions are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

3. The printing screen according to claim 2, characterized in that: The first protrusion is a continuous long rib extending along the first direction; Alternatively, the first protrusion is a plurality of short ribs spaced apart along the first direction; Alternatively, the first protrusions are a plurality of first protrusions spaced apart along the first direction.

4. The printing offset screen according to claim 1, characterized in that: The printing screen also includes an outer frame, a gauze and a bonding part, wherein: The bonding portion is configured to bond the edge of the gauze to the bottom surface of the outer frame and to bond the edge of the printing plate to the bottom surface of the gauze; The printing plate is provided with a plurality of glue filling holes at least on a side of the raised area away from the printing area, and the glue of the adhesive portion is filled in the glue filling holes to increase the contact area between the adhesive portion and the printing plate.

5. The printing offset screen according to claim 4, characterized in that: At least one circle of the glue filling holes is provided at the edge of the printing rubber plate, and the printing rubber area and the raised area are located within the area surrounded by the glue filling holes.

6. The printing offset screen according to claim 4, characterized in that: The bonding portion includes an outer bonding portion and an inner bonding portion, wherein: The external bonding portion is located at the junction of the edge of the printing plate and the gauze, and the bottom surface of the printing plate is arranged lower than the external bonding portion. The glue of the external bonding portion flows to the edge of the printing plate and penetrates the gauze and flows to the bottom surface of the outer frame, so as to bond the printing plate, the gauze and the outer frame into one body. The inner bonding portion is located at the junction of the inner side wall of the outer frame and the gauze, and the inner bonding portion covers the glue filling hole. The glue of the inner bonding portion flows to the inner side wall of the outer frame and penetrates the gauze to flow to the top surface of the printing plate and the glue filling hole, so as to bond the printing plate, the gauze and the outer frame into one.

7. The offset printing screen according to claim 1, characterized in that: A second raised portion located in the rubber printing area is provided on the bottom surface of the rubber printing plate, and each of the mesh holes passes through the rubber printing plate and the second raised portion.

8. The offset printing screen according to claim 7, characterized in that: The second raised portion includes a plurality of second protrusions arranged in an array, and each of the second protrusions is provided with at least one mesh hole.

9. The offset printing screen according to claim 8, characterized in that: The plurality of second bumps can be divided into a first end bump region, a middle bump region, and a second end bump region along the second direction, wherein the first end bump region includes a column of the second bumps, the middle bump region includes a plurality of columns of the second bumps, and the second end bump region includes a column of the second bumps, and each column of the second bumps is arranged along the first direction; The second bumps in two adjacent columns in the middle bump area are arranged alternately.

10. The offset printing screen according to claim 9, characterized in that: Two mesh holes are arranged on each second bump in the second end bump area at intervals along the second direction, and the distance between the two mesh holes on each second bump in the second end bump area is smaller than the column distance between the second bumps in each column in the middle bump area.

11. The offset printing screen according to claim 3, characterized in that: The length of the first protrusion is not less than 15 mm.

12. A rubber printing mechanism, characterized in that: The rubber printing mechanism comprises a scraper assembly and the rubber printing screen according to any one of claims 1 to 11, wherein: The scraper assembly is arranged above the printing screen, and the scraper assembly includes a driving assembly and a scraper. The driving end of the driving assembly is connected to the scraper, and the driving assembly is configured to drive the scraper to rise and fall and move laterally; The drive assembly drives the scraper to descend and press against the printing plate and then move horizontally to scrape the glue on the printing plate into the mesh. The glue flows through the mesh to the surface of the solder strip and the battery cell to be printed.

13. A battery glue printing device, characterized in that: The battery string glue printing device includes a battery string conveying mechanism, a first glue printing mechanism, a first curing mechanism, a flipping mechanism, a second glue printing mechanism, and a second curing mechanism. The first glue printing mechanism and the second glue printing mechanism are both the glue printing mechanisms according to claim 12, wherein: The conveying path of the battery string conveying mechanism is sequentially provided with a first glue printing station, a first curing station, a flipping station, a second glue printing station, and a second curing station. The battery string conveying mechanism is configured to convey the battery string in a stepwise manner along the second direction. The first glue printing mechanism is arranged above the first glue printing station, and is configured to print glue on the front surface of the battery cell passing through the first glue printing station; The first curing mechanism is disposed at the first curing station, and is configured to cure the glue points on the front surface of the battery cell passing through the first curing station; The flipping mechanism is disposed at the flipping station, and is configured to flip the battery string cured by the first curing mechanism at the flipping station so that the back surfaces of all battery cells in the battery string face upwards; The second glue printing mechanism is arranged above the second glue printing station, and the second glue printing mechanism is configured to print glue on the back side of the battery cell passing through the second glue printing station; The second curing mechanism is disposed at the second curing station, and the second curing station is configured to cure the glue spots on the back side of the battery cell passing through the second curing station.

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