Printing screen assembly, main-grid-free back contact battery and photovoltaic assembly

Abstract

The utility model discloses a printing screen assembly, a main-grid-free back contact cell and a photovoltaic assembly, the printing screen assembly comprises a first screen and a second screen, the bottom surface of the first screen is provided with a plurality of first insulating slurry preformed holes, and the first screen is provided with a plurality of conductive slurry printing holes in a penetrating manner; a plurality of second insulating slurry preformed holes and a plurality of conductive slurry preformed holes are formed in the bottom surface of the second screen plate; the position of the first screen plate where the first insulating slurry preformed hole is located corresponds to the position of the second screen plate where the second insulating slurry preformed hole is located, and the position of the second screen plate where the conductive slurry printing hole is located corresponds to the position of the second screen plate where the conductive slurry preformed hole is located. And a plurality of bonding slurry printing holes are formed in the second screen plate in a penetrating manner. According to the utility model, the manufacturing quality of the main-grid-free back contact battery is improved through the printing screen assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of busbar-free back-contact batteries, and in particular relates to a printed screen assembly, a busbar-free back-contact battery and a photovoltaic assembly. Background Art

[0002] Busbarless back-contact cells utilize low-temperature solder ribbons to secure the busbarless cells, achieving low-temperature soldering between the ribbons and the cells during the PV module lamination process. Back-contact cells have no busbars on the front, with both the P and N regions located on the back. By printing insulating paste or adhesive on the alternate busbars, the positive and negative electrodes are arranged alternately, providing cross-region insulation protection for the same-polarity busbars. However, due to the high level of printed insulating paste, there is a certain height difference between the cell's fine busbars and the insulating paste, preventing the solder ribbon from directly contacting the fine busbars. Therefore, solder paste, conductive adhesive, or silver paste must be printed to raise the fine busbars for adequate contact with the solder ribbon.

[0003] During the lamination process of photovoltaic modules, since there is a certain height difference between the low-temperature soldering ribbon and the fine grid lines on the solar cells, when the low-temperature soldering ribbon and the fine grid lines are welded with solder paste, conductive glue or silver paste, the packaging film of the photovoltaic module melts, causing the soldering ribbon to shift and twist, affecting the welding accuracy of the soldering ribbon and causing quality problems of the photovoltaic module.

[0004] The following problems exist in the process flow of photovoltaic modules: First, the insulating paste printed on the cell needs to undergo a first heat curing operation before the solder paste can be printed again. Since the insulating paste is printed on the back of the cell, if the first heat curing operation is not performed, the stencil for printing the solder paste will come into contact with the insulating paste and cause contamination. The solder paste printed on the cell needs to undergo a second heat curing operation, resulting in high energy consumption and high production costs. Second, in order to solve the problem that the solder ribbon will be offset and twisted due to the melting of the above-mentioned encapsulation film, the solder ribbon needs to be fixed before the photovoltaic module is laminarized. Conventional methods of fixing the solder ribbon include a dispensing process, in which the needle of the dispensing device is used to apply glue to each point on the cell one by one. However, the glue shape of the needle dispensing glue is burred, and the molding effect is uneven. After the glue is connected to the cell and cured, the cell is subjected to force during the lamination process, and the connection between the cell and the glue may cause hidden cracks in the cell lamination. In addition, the efficiency of the needle dispensing glue is low. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned technical problems and provide a printed screen assembly, a busbar-less back-contact cell, and a photovoltaic module, thereby enabling the printing of insulating paste on the cell through the printed screen assembly without curing, and then printing conductive paste on the cell, and heat-curing the insulating paste and conductive paste together, thereby reducing manufacturing energy consumption and costs. The printed screen assembly avoids the heat-cured insulating paste and conductive paste, and prints adhesive paste on the cell, thereby reducing the risk of cell cracking and improving the manufacturing quality of the busbar-less back-contact cell. In order to achieve the above-mentioned purpose, the technical solution of this utility model is as follows:

[0006] A printed screen assembly includes a first screen and a second screen, wherein the bottom surface of the first screen is provided with a plurality of first insulating paste reserved holes, and the first screen is penetrated by a plurality of conductive paste printing holes, and the first insulating paste reserved holes and the conductive paste printing holes arranged in the horizontal and / or vertical directions are alternately arranged; the bottom surface of the second screen is provided with a plurality of second insulating paste reserved holes and a plurality of conductive paste reserved holes, and the second insulating paste reserved holes and the conductive paste reserved holes arranged in the horizontal and / or vertical directions are alternately arranged; the position of the first insulating paste reserved holes in the first screen corresponds to the position of the second insulating paste reserved holes in the second screen, the position of the conductive paste printing holes in the second screen corresponds to the position of the conductive paste reserved holes in the second screen, and the second screen is penetrated by a plurality of adhesive paste printing holes, and the adhesive paste printing holes, the second insulating paste reserved holes and the conductive paste reserved holes are located in the same straight line.

[0007] Specifically, the distances between adjacent first insulating paste reserved holes and the conductive paste printed holes arranged in the transverse direction are equal; the distances between adjacent first insulating paste reserved holes and the conductive paste printed holes arranged in the longitudinal direction are equal.

[0008] Specifically, the first mesh plate and the second mesh plate have the same structural dimensions, and the first insulating slurry reserved hole and the second insulating slurry reserved hole have the same structure.

[0009] Specifically, the first insulating slurry reserved hole, the second insulating slurry reserved hole and the conductive slurry reserved hole are single arch structures, and the ratio of the arch height to the span of the single arch structure is 1:3-1:6.

[0010] Specifically, the arch height of the first insulating paste reserved hole is not greater than 1 / 2 of the thickness of the first mesh plate, the arch height of the second insulating paste reserved hole is not greater than 1 / 2 of the thickness of the second mesh plate, and the arch height of the conductive paste reserved hole is not greater than 1 / 3 of the thickness of the second mesh plate.

[0011] Specifically, the first screen plate avoids the insulating paste on the battery cell through the first insulating paste reserved hole, and the first screen plate prints the conductive paste on the battery cell through the conductive paste printing hole.

[0012] Specifically, the second screen avoids the insulating paste on the battery cell through the second insulating paste reserved hole, the second screen avoids the conductive paste on the battery cell through the conductive paste reserved hole, and the second screen prints the adhesive paste on the battery cell through the adhesive paste printing hole.

[0013] A main grid-less back contact battery is manufactured using the printed screen assembly, comprising a battery cell, a first grid line, a second grid line, an insulating paste, a conductive paste and an adhesive paste; a plurality of the first grid lines and the second grid lines are arranged alternately at intervals along the longitudinal direction on the battery cell, the first grid lines and the second grid lines both extend in the transverse direction, the first grid lines and the second grid lines are both provided with a plurality of the insulating pastes and the conductive pastes arranged alternately at intervals, the insulating pastes and the conductive pastes arranged longitudinally on the same straight line are alternately arranged to form a soldering track, a plurality of the adhesive pastes are arranged at intervals on the battery cell along the soldering track, the adhesive pastes avoid the first grid lines and the second grid lines.

[0014] Specifically, adjacent first gate lines and second gate lines form a gate line gap, and a plurality of gate line gaps are provided between adjacent bonding pastes arranged along the soldering track. The soldering tape connects several bonding pastes and several conductive pastes along the soldering track.

[0015] A photovoltaic module includes the above-mentioned busbar-free back contact cell.

[0016] Compared with the prior art, the printed screen assembly, busbar-free back contact cell and photovoltaic assembly of the present invention have the following beneficial effects:

[0017] The printing screen assembly includes a first screen and a second screen. The first screen is provided with a first insulating paste reserved hole for avoiding the insulating paste and a conductive paste printing hole for printing the conductive paste, so that the conductive paste is printed smoothly, and the insulating paste and the conductive paste can be thermally cured and formed together, which has the effect of saving energy and reducing costs; the second screen is provided with a second insulating paste reserved hole for avoiding the insulating paste, a conductive paste reserved hole for avoiding the conductive paste and an adhesive paste printing hole for printing the adhesive paste, so that the adhesive paste is printed smoothly and formed without a burr tip structure, the second screen effectively avoids the cured insulating paste and the conductive paste, the second screen is fitted to the battery cell for printing smoothly, avoiding the battery cell from cracking in the subsequent lamination process, and improving the quality of the battery cell; the first screen and the second screen can be used to quickly realize the printing operation, avoiding the traditional dispensing needle and tube operation method, effectively improving the efficiency of forming the conductive paste and the adhesive paste on the battery cell, and thereby improving the manufacturing efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the manufacturing process of a busbar-free back contact battery provided in an embodiment of the present application;

[0019] Figure 2 A schematic side view of the insulating paste and the conductive paste printed on the cell according to the embodiment of the present application;

[0020] Figure 3 A side cross-sectional schematic diagram of a first screen provided in an embodiment of the present application;

[0021] Figure 4 A side cross-sectional schematic diagram of a second screen provided in an embodiment of the present application;

[0022] Figure 5 A schematic cross-sectional view of a first insulating paste reserved hole and a conductive paste reserved hole provided in an embodiment of the present application;

[0023] Figure 6 A schematic top view of a busbar-less back contact battery provided in an embodiment of the present application.

[0024] Reference numerals:

[0025] First stencil 1, first insulating paste reserved holes 11, conductive paste printing holes 12;

[0026] Second stencil 2, second insulating paste reserved holes 21, conductive paste reserved holes 22, adhesive paste printing holes 23;

[0027] Solar cell 3, first grid line 31, second grid line 32, insulating paste 33, conductive paste 34, adhesive paste 35. DETAILED DESCRIPTION

[0028] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0029] Example 1

[0030] The existing manufacturing process of the main grid-free back contact battery generally includes the following steps: providing a battery cell 3, printing an insulating paste 33 on the back of the battery cell 3, undergoing a first heat curing treatment, printing solder paste on the back of the battery cell 3, undergoing a second heat curing treatment, dicing the battery cell 3, laying out the battery cell 3, dispensing adhesive on the back of the battery cell 3 through a needle, placing the solder strip on the arrangement track of the insulating paste 33, printed solder paste and adhesive, waiting for the adhesive to solidify and take shape, and stacking the various components of the photovoltaic module with the main grid-free back contact battery, and finally laminating and welding to form the photovoltaic module.

[0031] In order to solve the following problems existing in the manufacturing process of the main grid-free back contact battery, including: first, the insulating paste 33 printed on the battery cell 3 needs to undergo a first heat curing operation before the solder paste can be printed again. Since the insulating paste 33 is printed on the back of the battery cell 3, if the first heat curing operation is not performed, the stencil for printing the solder paste is in direct contact with the insulating paste 33, causing contamination. The solder paste printed on the battery cell 3 needs to undergo a second heat curing operation, resulting in high energy consumption and high production costs; second, the needle of the dispensing device is used to dispense glue to each point on the battery cell 3 one by one, but the glue shape of the needle dispensing glue has a rough tip shape, the molding effect is uneven, and serious cracks in the lamination of the battery cell 3 may be caused, and the needle dispensing efficiency is low.

[0032] This embodiment provides a printed screen assembly, which is applied to the manufacturing process of a busbar-less back-contact battery. The above-mentioned problems can be well solved by improving the printed screen assembly, which is described in detail below.

[0033] like Figures 1-6 As shown, this embodiment provides a printing screen assembly, including a first screen 1 and a second screen 2,

[0034] The bottom surface of the first screen 1 is provided with a plurality of first insulating paste reserved holes 11, and the first screen 1 is penetrated by a plurality of conductive paste printed holes 12. The first insulating paste reserved holes 11 and the conductive paste printed holes 12 arranged in the horizontal direction and / or in the vertical direction are arranged alternately; the distance between adjacent first insulating paste reserved holes 11 and conductive paste printed holes 12 arranged in the horizontal direction is equal; the distance between adjacent first insulating paste reserved holes 11 and conductive paste printed holes 12 arranged in the vertical direction is equal.

[0035] The first screen 1 prints the conductive paste 34 on the back of the battery cell 3. The insulating paste 33 has been printed on the battery cell 3. The first insulating paste reserved hole 11 is used to avoid the insulating paste 33. The conductive paste printing hole 12 is the hole position for printing the conductive paste 34. The first screen 1 avoids the insulating paste 33 through the first insulating paste reserved hole 11. When the first screen 1 and the battery cell 3 are printed and bonded, the insulating paste 33 in the first insulating paste reserved hole 11 will not overflow and pollute the first screen 1. The first screen 1 can print the conductive paste 34 on the battery cell 3 through the conductive paste reserved hole 22 when the insulating paste 33 has not been cured. After the first screen 1 is printed, the insulating paste 33 and the conductive paste 34 on the battery cell 3 can be simultaneously heat-cured at one time, avoiding the high energy consumption and high cost problems caused by the traditional process of heat-curing the insulating paste 33 and the conductive paste 34 separately.

[0036] The bottom surface of the second stencil 2 is provided with a plurality of second insulating paste reserved holes 21 and a plurality of conductive paste reserved holes 22. The second insulating paste reserved holes 21 and the conductive paste reserved holes 22 are arranged alternately in the horizontal and / or vertical directions. The first stencil 1 and the second stencil 2 have the same area. The first insulating paste reserved holes 11 on the first stencil 1 correspond to the second insulating paste reserved holes 21 on the second stencil 2. The conductive paste printed holes 12 on the second stencil 2 correspond to the conductive paste reserved holes 22 on the second stencil 2. The distance between the second insulating paste reserved holes 21 and the conductive paste reserved holes 22 arranged in the horizontal direction is equal, and the distance between the second insulating paste reserved holes 21 and the conductive paste reserved holes 22 arranged in the vertical direction is equal. Among them, the conductive paste printed holes 12 are through holes for printing the conductive paste 34, and the conductive paste reserved holes 22 are blind holes for avoiding the conductive paste 34.

[0037] The first insulating slurry reserved hole 11 and the second insulating slurry reserved hole 21 have the same structure. The thickness of the first mesh plate 1 and the second mesh plate 2 are equal, and the thickness of the first mesh plate 1 and the second mesh plate 2 are both along the Z direction. The first insulating slurry reserved hole 11, the second insulating slurry reserved hole 21 and the conductive slurry reserved hole 22 can adopt a single arch structure, and the ratio of arch height to span is 1:3-1:6. The arch height of the first insulating slurry reserved hole 11 is not greater than 1 / 2 of the thickness of the first mesh plate 1, and the arch height of the second insulating slurry reserved hole 21 is not greater than 1 / 2 of the thickness of the second mesh plate 2. The span range X of the first insulating slurry reserved hole 11 and the second insulating slurry reserved hole 21 is ≥100μm, and the arch height range Y of the first insulating slurry reserved hole 11 and the second insulating slurry reserved hole 21 is ≥50μm; the arch height of the conductive slurry reserved hole 22 is not greater than 1 / 3 of the thickness of the second mesh plate 2; the span range A of the conductive slurry reserved hole 22 is ≥100μm, and the arch height range B of the conductive slurry reserved hole 22 is ≥30μm. The circumferential connection between the single arch structure and the plate surface of the first mesh plate 1 or the plate surface of the second mesh plate 2 is chamfered. The single arch structure can effectively reduce the prestress of the first mesh plate 1 and the second mesh plate 2, has good anti-deformation effect, and improves the service life of the first mesh plate 1 and the second mesh plate 2; the single arch structure can be formed by machining and has good machinability.

[0038] The second stencil 2 is provided with a plurality of adhesive paste printing holes 23. The adhesive paste printing holes 23 are arranged at equal intervals in the horizontal and / or vertical directions. The adhesive paste printing holes 23 are located longitudinally between the second insulating paste reserved holes 21 and the conductive paste reserved holes 22. The adhesive paste printing holes 23 are located in a straight line with the second insulating paste reserved holes 21 and the conductive paste reserved holes 22. The adhesive paste printing holes 23 are through-holes for printing adhesive paste 35.

[0039] The second screen plate 2 prints the adhesive paste printing hole 23 on the back of the battery cell 3, and the insulating paste 33 and the conductive paste 34 have been printed on the battery cell 3, and the insulating paste 33 and the conductive paste 34 are in a solidified state; wherein, the second screen plate 2 avoids the insulating paste 33 through the second insulating paste reserved hole 21, and avoids the conductive paste 34 through the conductive paste reserved hole 22, so that the second screen plate 2 and the battery cell 3 are printed in a laminated manner, and the second screen plate 2 prints the adhesive paste 35 on the battery cell 3 through the adhesive paste printing hole 23. The molding effect of the adhesive paste 35 printed on the battery cell 3 is smooth. After printing, the adhesive paste 35 has no burr tip structure. The adhesive paste 35 is connected to the soldering tape. After the adhesive paste 35 is solidified, the soldering tape is welded to the conductive paste 34 through a subsequent lamination welding process. The position where the soldering tape is connected to the adhesive paste 35 is evenly stressed, avoiding the problem of battery cell 3 cracking and improving the printing effect of the adhesive paste 35.

[0040] In this embodiment, the conductive paste 34 may be solder paste, conductive glue, or silver paste; the insulating paste 33 may be insulating glue; and the bonding paste 35 may be ultraviolet curing glue or thermal curing glue.

[0041] In this embodiment, the printing screen assembly includes a first screen 1 and a second screen 2. The first screen 1 and the second screen 2 print the conductive paste 34 and the bonding paste 35 on the battery cell 3 respectively. The first screen 1 is provided with a first insulating paste reserved hole 11 for avoiding the insulating paste 33 and a conductive paste printing hole 12 for printing the conductive paste 34, so that the conductive paste 34 is printed evenly, and the insulating paste 33 and the conductive paste 34 can be thermally cured and formed at the same time, which has the effect of energy saving and cost reduction; the second screen 2 is provided with a second insulating paste reserved hole 21 for avoiding the insulating paste 33 and a conductive paste printing hole 12 for avoiding the conductive paste 34. The conductive paste reserved holes 22 and the adhesive paste printing holes 23 for printing the adhesive paste 35 allow the adhesive paste 35 to be printed smoothly and formed without a burr-tip structure. The second screen 2 effectively avoids the insulating paste 33 and the conductive paste 34. The second screen 2 fits the battery cell 3 smoothly and prints stably, avoiding the battery cell 3 from cracking and improving the printing quality of the battery cell 3. The first screen 1 and the second screen 2 can quickly realize the printing operation, avoiding the traditional dispensing needle operation method, and effectively improving the efficiency of forming the conductive paste 34 and the adhesive paste 35 on the battery cell 3, thereby improving the manufacturing efficiency of the photovoltaic module.

[0042] Example 2

[0043] This embodiment provides a busbar-less back-contact battery, which is manufactured using the printed screen assembly in the above embodiment.

[0044] like Figure 6 As shown, the main grid-free back contact battery includes a battery cell 3, a first grid line 31, a second grid line 32, an insulating paste 33, a conductive paste 34 and an adhesive paste 35; a plurality of first grid lines 31 and a second grid line 32 are arranged alternately at intervals along the longitudinal direction on the battery cell 3, and the first grid lines 31 and the second grid lines 32 are both extended in the transverse direction. The first grid lines 31 and the second grid lines 32 are both provided with a plurality of insulating pastes 33 and conductive pastes 34 arranged alternately at intervals. The insulating pastes 33 and the conductive pastes 34 arranged longitudinally on the same straight line are alternately arranged to form a welding track. The adhesive paste 3 is arranged at intervals on the battery cell 3 along the welding track, and the adhesive paste 35 avoids the first grid lines 31 and the second grid lines 32.

[0045] Several adhesive pastes 35 are spaced equidistantly in the horizontal and / or vertical directions. Adjacent first and second gate lines 31 and 32 form a gate line gap. At least two gate line gaps are provided between adjacent adhesive pastes 35 arranged along the solder ribbon track. Several adhesive pastes 35 are used to connect the solder ribbons, which are arranged along the solder ribbon track and are welded to the conductive paste 34. The first and second gate lines 31, 32, insulating paste 33, conductive paste 34, adhesive paste 35, and solder ribbons are all located on the back side of the cell 3.

[0046] This embodiment is described using the X direction of the cell 3 as the horizontal direction, the Y direction of the cell 3 as the vertical direction, and the Z direction of the cell 3 as the thickness direction as an example. The main body of the cell 3 has a square structure. For example, a second grid line 32 is provided at the front end of the cell 3, and a first grid line 31 is provided at the end of the cell 3. The second grid lines 32 and the first grid lines 31 are arranged alternately between the front and rear ends of the cell 3, and the first grid lines 31 and the second grid lines 32 are parallel. An insulating paste 33 is provided on the left side of the upper edge of the first grid line 31, and an insulating paste 33 is provided on the right side of the upper edge of the first grid line 31. The insulating paste 33 and the conductive paste 34 are arranged alternately between the left and right sides of the first grid line 31. A conductive paste 34 is provided on the left side of the upper edge of the second grid line 32, and a conductive paste 34 is provided on the right side of the upper edge of the second grid line 32. The conductive paste 34 and the insulating paste 33 are arranged alternately between the left and right sides of the second grid line 32. An adhesive paste 35 is provided between the first gate line 31 and the second gate line 32 at the front end of the battery cell 3, and an adhesive paste 35 is provided between the first gate line 31 and the second gate line 32 at the rear end of the battery cell 3. The adhesive paste 35 between the front end and the rear end of the battery cell 3 is arranged at equal intervals along the welding track.

[0047] In this embodiment, five columns of longitudinal soldering tracks are formed on the battery cell 3. The soldering track located near the left side of the battery cell 3 is the first column, and the soldering track located near the right side of the battery cell 3 is the fifth column. The arrangement of the conductive paste 34, adhesive paste 35 and insulating paste 33 on the first, third and fifth columns is the same; the arrangement of the conductive paste 34, adhesive paste 35 and insulating paste 33 on the second and fourth columns is the same.

[0048] Example 3

[0049] This embodiment provides a photovoltaic module, including the busbar-less back-contact cell in the above embodiment.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0051] 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 quantity of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0054] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A printing screen assembly, characterized in that: It includes a first screen plate and a second screen plate, the bottom surface of the first screen plate is provided with a plurality of first insulating paste reserved holes, the first screen plate is penetrated by a plurality of conductive paste printing holes, the first insulating paste reserved holes and the conductive paste printing holes arranged in the horizontal and / or vertical direction are alternately arranged; the bottom surface of the second screen plate is provided with a plurality of second insulating paste reserved holes and a plurality of conductive paste reserved holes, the second insulating paste reserved holes and the conductive paste reserved holes arranged in the horizontal and / or vertical direction are alternately arranged; the position of the first insulating paste reserved holes in the first screen plate corresponds to the position of the second insulating paste reserved holes in the second screen plate, the position of the conductive paste printing holes in the second screen plate corresponds to the position of the conductive paste reserved holes in the second screen plate, the second screen plate is penetrated by a plurality of adhesive paste printing holes, the adhesive paste printing holes and the second insulating paste reserved holes and the conductive paste reserved holes are located in the same straight line.

2. The printing screen assembly according to claim 1, wherein: The distances between adjacent first insulating paste reserved holes and the conductive paste printed holes arranged in the transverse direction are equal; the distances between adjacent first insulating paste reserved holes and the conductive paste printed holes arranged in the longitudinal direction are equal.

3. The printing screen assembly according to claim 1, wherein: The first mesh plate and the second mesh plate have the same structural dimensions, and the first insulating slurry reserved hole and the second insulating slurry reserved hole have the same structure.

4. The printing screen assembly according to claim 1, wherein: The first insulating paste reserved hole, the second insulating paste reserved hole and the conductive paste reserved hole are all single arch structures, and the circumference of the single arch structure is chamfered at the connection with the plate surface of the first mesh plate or the plate surface of the second mesh plate.

5. The printing screen assembly according to claim 4, wherein: The arch height of the first insulating paste reserved hole is not greater than 1 / 2 of the thickness of the first mesh plate, the arch height of the second insulating paste reserved hole is not greater than 1 / 2 of the thickness of the second mesh plate, and the arch height of the conductive paste reserved hole is not greater than 1 / 3 of the thickness of the second mesh plate.

6. The printing screen assembly according to claim 1, wherein: The first screen plate avoids the insulating paste on the battery cell through the first insulating paste reserved hole, and the first screen plate prints the conductive paste on the battery cell through the conductive paste printing hole.

7. The printing screen assembly according to claim 1, wherein: The second screen avoids the insulating paste on the battery cell through the second insulating paste reserved hole, the second screen avoids the conductive paste on the battery cell through the conductive paste reserved hole, and the second screen prints the adhesive paste on the battery cell through the adhesive paste printing hole.

8. A busbar-less back contact cell manufactured using the printed screen assembly according to any one of claims 1 to 7, characterized in that: It includes a battery cell, a first gate line, a second gate line, an insulating paste, a conductive paste and an adhesive paste; the battery cell is provided with a plurality of the first gate lines and the second gate lines arranged alternately at intervals along the longitudinal direction, the first gate lines and the second gate lines are both extended in the transverse direction, the first gate lines and the second gate lines are both provided with a plurality of the insulating pastes and the conductive pastes arranged alternately at intervals, the insulating pastes and the conductive pastes arranged longitudinally on the same straight line are alternately arranged to form a welding track, a plurality of the adhesive pastes are arranged at intervals on the battery cell along the welding track, and the adhesive pastes avoid the first gate lines and the second gate lines.

9. The busbar-less back contact cell according to claim 8, characterized in that: Adjacent first gate lines and second gate lines form a gate line gap, and a plurality of gate line gaps are provided between adjacent bonding pastes arranged along the welding tape track. The welding tape connects several bonding pastes and several conductive pastes along the welding tape track.

10. A photovoltaic module, characterized in that: Comprising the busbar-less back contact cell as claimed in claim 8.

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