Screen printing plate and manufacturing method thereof

Abstract

The invention relates to the technical field of printing screens, in particular to a printing screen and a manufacturing method thereof. The printing screen comprises a screen body and a reinforcing structure. The screen printing plate body is provided with a first printing groove and a plurality of second printing grooves formed in the first direction at intervals, the second printing grooves extend in the second direction, and the first direction intersects with the second direction. At least part of the second printing grooves intersect with the first printing grooves. The reinforcing structure is at least partially arranged at the position, provided with the first printing groove, of the screen printing plate body, the reinforcing structure is partially hollowed out, and the hollowed-out position communicates with the first printing groove. According to the printing screen, the bus electrodes and the collector grid lines can be printed at the same time, so that the cost of the solar cell in the printing process is reduced, the printing process is simplified, and the production efficiency of the solar cell is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing screen, in particular to a printing screen and a manufacturing method thereof. BACKGROUND

[0002] Solar cells need to use two kinds of printing screens to print the intersecting bus electrodes and current collecting grid lines respectively, and the purchase of two kinds of printing screens results in high production cost. Moreover, the two kinds of printing screens print the bus electrodes and current collecting grid lines respectively to form two printing processes, which results in more printing processes and low production efficiency. SUMMARY

[0003] The embodiments of the present application disclose a printing screen and a manufacturing method thereof, which can print the bus electrodes and current collecting grid lines simultaneously, thereby reducing the cost of solar cells in the printing process, simplifying the printing process and improving the production efficiency of solar cells.

[0004] To achieve the above object, in a first aspect, the embodiments of the present application disclose a printing screen, comprising:

[0005] a screen body, wherein the screen body is provided with a first printing groove and a plurality of second printing grooves which are arranged at intervals along a first direction, each of the second printing grooves extends along a second direction, and the first direction intersects the second direction; at least part of the second printing grooves intersects the first printing groove; and

[0006] a reinforcing structure, wherein the reinforcing structure is arranged at least partially at a position where the screen body is provided with the first printing groove, and the reinforcing structure is partially hollowed out and the hollowed-out part is in communication with the first printing groove.

[0007] In a possible implementation manner of the first aspect, the width of the first printing groove along the second direction is greater than the width W1 of the narrowest part of the second printing groove.

[0008] In a possible implementation manner of the first aspect, the first printing groove comprises a fish-tail printing part, and at least part of the second printing grooves intersects the fish-tail printing part.

[0009] The reinforcing structure is arranged at least partially corresponding to the fish-tail printing part, and the hollowed-out part of the reinforcing structure is in communication with the fish-tail printing part.

[0010] In a possible implementation manner of the first aspect, the reinforcing structure comprises a plurality of first filaments, and the plurality of first filaments are arranged at intervals in a setting area of the fish-tail printing part, and a hollowed-out part is formed between two adjacent first filaments.

[0011] In a possible implementation manner of the first aspect, the fish-tail printed part includes two split printed segments spaced apart in the second direction, the first filament extends along a width direction of the split printed segments and is connected between opposite side walls of the split printed segments; and / or,

[0012] At least one side edge of the first filament is an arc-shaped edge along a width direction of the first filament; and / or,

[0013] A width of the first filament narrows from a middle part to both ends along a width direction of the split printed segment.

[0014] In a possible implementation manner of the first aspect, an intersection area of the second printed slot and the fish-tail printed part is arranged away from the reinforcing structure.

[0015] In a possible implementation manner of the first aspect, the first printed slot includes a pad printed part, a size D1 of the pad printed part in the second direction is greater than a width W1 of the second printed slot at a narrowest part;

[0016] The reinforcing structure is arranged at least partially corresponding to the pad printed part, and a hollow part of the reinforcing structure is in communication with the pad printed part.

[0017] In a possible implementation manner of the first aspect, a part of the reinforcing structure arranged corresponding to the pad printed part is selected from at least one of a honeycomb substructure and a mesh substructure.

[0018] In a possible implementation manner of the first aspect, the first printed slot includes a bus bar printed part, the bus bar printed part extends along the first direction and intersects with at least part of the second printed slots, a width W2 of the bus bar printed part in the second direction is greater than the width W1 of the second printed slot at the narrowest part;

[0019] The reinforcing structure is arranged at least partially corresponding to the bus bar printed part, and a hollow part of the reinforcing structure is in communication with the bus bar printed part.

[0020] A part of the reinforcing structure arranged corresponding to the bus bar printed part is selected from at least one of a honeycomb substructure and a mesh substructure.

[0021] In a possible implementation manner of the first aspect, the first printed slot includes:

[0022] a bus bar printed part extending along the first direction, and part of the second printed slots intersects with the bus bar printed part;

[0023] A fishhook printing part is arranged at at least one end of the bus bar printing part along the first direction, the opening rate of the fishhook printing part is greater than the opening rate of the bus bar printing part, and a partial number of the second printing grooves intersect with the fishhook printing part; and

[0024] A pad printing part is connected to the bus bar printing part;

[0025] The reinforcing structure at least partially corresponds to the bus bar printing part, the fishhook printing part, and the pad printing part, and the hollow part of the reinforcing structure is in communication with the bus bar printing part, the fishhook printing part, and the pad printing part.

[0026] In a possible implementation manner of the first aspect, along the second direction, a local part of the second printing groove is a structure reinforcing segment, the width of the widest part of the structure reinforcing segment is W3, and a remaining part of the second printing groove except the structure reinforcing segment is a main body printing segment, the width of the narrowest part of the main body printing segment is W1; wherein W3> W1.

[0027] The reinforcing structure is also arranged at the position where the screen printing plate main body is provided with the structure reinforcing segment, the reinforcing structure is partially hollow, and the hollow parts are in communication with the respective structure reinforcing segments.

[0028] In a possible implementation manner of the first aspect, the reinforcing structure comprises a plurality of second filaments arranged at intervals along the second direction, each of the second filaments is connected between opposite sides of the structure reinforcing segment along the first direction, and a hollow part is formed between two adjacent second filaments.

[0029] In a possible implementation manner of the first aspect, along the second direction, at least one side edge of the second filament is an arc-shaped edge; and / or,

[0030] Along the first direction, the width of the second filament narrows from the middle part to the two ends.

[0031] In a possible implementation manner of the first aspect, the first printing groove comprises a bus bar printing part extending along the first direction, a partial number of the second printing grooves intersect with the bus bar printing part or an extension line of the bus bar printing part, and the intersection is provided with the structure reinforcing segment; and / or,

[0032] The opening rate of the structure reinforcing segment is greater than or equal to 30% and less than or equal to 70%; and / or,

[0033] The opening rate of the main body printing segment is greater than or equal to 80% and less than or equal to 100%.

[0034] In a second aspect, the embodiments of the present application disclose a method for manufacturing a printing screen plate, comprising the following steps:

[0035] manufacturing a reinforcing structure: manufacturing the reinforcing structure on a substrate;

[0036] manufacturing a screen plate body: manufacturing the screen plate body with first printing grooves and second printing grooves on the substrate with the reinforcing structure; wherein the first printing grooves extend along a first direction, the second printing grooves extend along a second direction, the first direction intersects the second direction; at least part of the second printing grooves intersect the first printing grooves; the reinforcing structure is at least partially arranged at a position where the screen plate body is provided with the first printing grooves, the reinforcing structure is partially hollowed out, and the hollowed-out part communicates with the first printing grooves.

[0037] In a possible implementation manner of the second aspect, the step of manufacturing the reinforcing structure comprises:

[0038] manufacturing a first glue layer: manufacturing the first glue layer on a local area of the substrate which is not conductive;

[0039] depositing a first conductive layer: depositing the first conductive layer on a side of the first glue layer away from the substrate;

[0040] manufacturing a patterned second glue layer: manufacturing the patterned second glue layer on a side of the first conductive layer away from the first glue layer, so that a local area of the first conductive layer is exposed to the second glue layer, and the exposed area of the first conductive layer corresponds to the pattern of the reinforcing structure;

[0041] electrodepositing the reinforcing structure: electrodepositing the reinforcing structure on the exposed area of the first conductive layer;

[0042] and / or,

[0043] the step of manufacturing the screen plate body comprises:

[0044] manufacturing a third glue layer: manufacturing the third glue layer on a local area of the substrate; wherein the pattern of the third glue layer corresponds to the pattern of the first printing grooves and the second printing grooves connected with each other, and part of the third glue layer covers a side of the reinforcing structure away from the substrate;

[0045] depositing a second conductive layer: depositing the second conductive layer on an area of the substrate except the third glue layer;

[0046] electrodepositing the screen plate body: electrodepositing the screen plate body on the second conductive layer.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] The printing screen plate of the present application can print the bus electrode and the current collecting grid line simultaneously, thereby reducing the cost of the solar cell in the printing process, simplifying the printing process, and improving the production efficiency of the solar cell.

[0049] The first printing groove is configured to print the bus electrode, and the second printing groove is configured to print the current collecting grid line, thereby realizing the simultaneous printing of the bus electrode and the current collecting grid line.

[0050] On this basis, the printing screen plate of the present application further comprises a reinforcing structure, which is at least partially arranged at the position where the main body of the screen plate is provided with the first printing groove, so as to enhance the structural strength of the printing screen plate, thereby improving the service life of the printing screen plate. Since the reinforcing structure is partially hollow, the paste can enter the first printing groove for printing through the hollow part of the reinforcing structure.

[0051] In summary, the printing screen plate of the present application prints the bus electrode and the current collecting grid line simultaneously through the first printing groove and the second printing groove. On this basis, the reinforcing structure is arranged at the position of the first printing groove to enhance the structure, so as to avoid the short service life of the printing screen plate, effectively reduce the cost of the solar cell in the printing process, simplify the printing process, and improve the production efficiency of the solar cell. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0053] Figure 1 An exploded view of the printing screen plate disclosed in the embodiments of the present application;

[0054] Figure 2 A structural schematic view of the printing screen plate disclosed in the embodiments of the present application;

[0055] Figure 3 A partial enlarged view of the A area shown in FIG. 1; Figure 2 A partial enlarged view of the B area shown in FIG. 1;

[0056] Figure 4 A partial enlarged view of the B area shown in FIG. 1; Figure 2 A partial enlarged view of the B area shown in FIG. 1;

[0057] Figure 5 A schematic view of the substrate for making the first adhesive layer disclosed in the embodiments of the present application;

[0058] Figure 6 A schematic view of the substrate for depositing the first conductive layer disclosed in the embodiments of the present application;

[0059] Figure 7 A schematic view of making a patterned second glue layer on a substrate according to an embodiment of the present application;

[0060] Figure 8 A schematic view of making an electro-deposition reinforced structure on a substrate according to an embodiment of the present application;

[0061] Figure 9 A schematic view of making a screen body on a substrate according to an embodiment of the present application.

[0062] Explanation of reference signs:

[0063] 1, printing screen; 10, screen body; 11, reinforcing structure; 111, first filament; 112, honeycomb substructure; 113, second filament; 12, first printing groove; 121, fish-tailed printing part; 1211, bifurcated printing section; 122, pad printing part; 123, busbar printing part; 13, second printing groove; 131, structure reinforcing section; 132, main body printing section; E, arc-shaped edge; G, hollowed-out part; L, extension line of busbar printing part; Y, first direction; X, second direction;

[0064] 2, substrate; 21, first glue layer; 22, first conductive layer; 23, second glue layer; 24, third glue layer; 25, second conductive layer. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0066] In the present application, the terms "upper", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0067] In addition, in addition to indicating the orientation or positional relationship, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific circumstances.

[0068] In addition, the terms "set", "provided with", "connected", "linked" should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly linked, or indirectly linked through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0069] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0070] The reason why the printing screen of the solar cell is difficult to print the bus electrode and the current collecting grid line at the same time is that the bus electrode and the current collecting grid line intersect, and generally intersect vertically. If the printing screen needs to print the bus electrode and the current collecting grid line at the same time, two intersecting printing grooves need to be provided on the printing screen, and the intersection of the printing grooves will cause the structural strength of the printing screen to be weak, the service life of the printing screen to be short, and the economic benefits of application in industrialization to be lost.

[0071] Based on the above analysis, the printing screen provided by the embodiments of the present application prints the bus electrode and the current collecting grid line through the first printing groove and the second printing groove. On this basis, the setting position of the first printing groove is structurally reinforced by the reinforcing structure to avoid the service life of the printing screen being too short, effectively reduce the cost of the solar cell in the printing process, simplify the printing process, and improve the production efficiency of the solar cell.

[0072] The technical solutions of the present application will be described below in conjunction with the embodiments and the drawings.

[0073] Please refer to Figure 1 and Figure 2 The embodiments of the present application disclose a printing screen 1, which comprises a screen body 10 and a reinforcing structure 11.

[0074] The screen body 10 is provided with a first printing groove 12 and a plurality of second printing grooves 13 arranged at intervals along a first direction Y, each second printing groove 13 extending along a second direction X, and the first direction Y intersecting the second direction X. At least part of the number of second printing grooves 13 intersect the first printing groove 12.

[0075] The reinforcing structure 11 is at least partially arranged at the position of the screen body 10 provided with the first printing groove 12, the reinforcing structure 11 is partially hollow, and the hollow part G is in communication with the first printing groove 12.

[0076] In more detail, in the present application, the partially hollowed reinforcing structure 11 is selected from at least one of a honeycomb structure, a mesh structure, a filament structure or a ring structure, wherein the filament structure comprises a plurality of spaced filaments, such as steel wires. The reinforcing structure 11 can be integrally formed, welded or riveted on the screen body 10. Integrally formed means that the reinforcing structure 11 is formed as a whole with the screen body 10, such as electroforming or laser engraving process.

[0077] The beneficial effects of the printing screen 1 disclosed in the embodiments of the present application are described below.

[0078] The printing screen 1 of the present application can simultaneously print the busbar and the collector grid line, thereby reducing the cost of the solar cell in the printing process, simplifying the printing process and improving the production efficiency of the solar cell.

[0079] The first printing groove 12 is configured to print the busbar, and in the present application, the busbar is selected from at least one of a busbar grid line, a solder pad and a fish-tail grid line. The second printing groove 13 is configured to print the collector grid line, thereby achieving simultaneous printing of the busbar and the collector grid line. A plurality of second printing grooves 13 spaced along the first direction Y are used to print a plurality of spaced collector grid lines. At least part of the number of second printing grooves 13 intersect with the first printing groove 12, so that at least part of the number of collector grid lines printed intersect with the busbar.

[0080] On this basis, the printing screen 1 of the present application further comprises a reinforcing structure 11, which is at least partially arranged at the position of the screen body 10 provided with the first printing groove 12 to enhance the structural strength of the printing screen 1. The reinforcing structure 11 can effectively improve the overall carrying capacity and stability of the printing screen 1, thereby improving the service life of the printing screen 1. Moreover, since the reinforcing structure 11 is partially hollowed, the paste can enter the first printing groove 12 for printing through the hollow part G of the reinforcing structure 11. In the present application, the term "paste" is a carrier for transferring active materials to the surface of a silicon wafer, which is a key material for grid line formation. For example, the paste is silver paste, silver-aluminum paste, aluminum paste or silver-coated copper paste.

[0081] In summary, the printing screen 1 of the present application simultaneously prints the busbar and the collector grid line through the first printing groove 12 and the second printing groove 13. On this basis, the reinforcing structure 11 is arranged at the position of the first printing groove 12 to enhance the structure, thereby avoiding the short service life of the printing screen 1, effectively reducing the cost of the solar cell in the printing process, simplifying the printing process and improving the production efficiency of the solar cell.

[0082] Further, the width of the first printing slot 12 in the second direction X is greater than the width W1 of the narrowest part of the second printing slot 13. That is, the first printing slot 12 is wider at least in part, and the wider first printing slot 12 has better paste passing property and thus better printing effect even if the first printing slot 12 is provided with the reinforcing structure 11 for structural reinforcement. Moreover, the reinforcing structure 11 is correspondingly arranged on the first printing slot 12 with a wider opening, which is beneficial to reinforcing the weak area of the printing screen 1 in a targeted manner.

[0083] The first printing slot 12 and the reinforcing structure 11 of the embodiment of the present application will be described below.

[0084] In some embodiments, referring to Figure 2 and Figure 3 , the first printing slot 12 includes a fish-tail printing part 121, and at least part of the second printing slots 13 intersect the fish-tail printing part 121.

[0085] The reinforcing structure 11 is arranged at least in part corresponding to the fish-tail printing part 121, and the hollow part G of the reinforcing structure 11 communicates with the fish-tail printing part 121.

[0086] In the present application, the fish-tail printing part 121 is configured to print the fish-tail grid line of the solar cell. The hollow part G of the reinforcing structure 11 communicates with the fish-tail printing part 121 to reinforce the structure of the fish-tail printing part 121. Moreover, the paste can pass through the hollow part G of the reinforcing structure 11 to enter the fish-tail printing part 121, so that the fish-tail printing part 121 can be printed.

[0087] Furthermore, the fish-tail grid line and the collector grid line can be printed on the same printing screen 1 using a burn-through paste, and the printed fish-tail grid line can also burn through the passivation film to form an ohmic contact with the doped layer to collect current, thereby effectively avoiding the blackening phenomenon in the area where the fish-tail grid line is arranged.

[0088] Further, the reinforcing structure 11 includes a plurality of first filaments 111, and the plurality of first filaments 111 are arranged at intervals in the arrangement area of the fish-tail printing part 121, and the hollow part G is formed between the two adjacent first filaments 111.

[0089] Considering that the opening width of the fish-tail printing part 121 is generally narrow, the present application uses a plurality of first filaments 111 to reinforce the fish-tail printing part 121. The first filaments 111 are, for example, steel wires, and the plurality of first filaments 111 arranged at intervals form the hollow part G to avoid forming a knot. Since the knot will cause poor paste passing property, when there is no knot between the plurality of first filaments 111, the fish-tail printing part 121 with a narrow opening width still has good paste passing property, which is beneficial to the shaping of the paste and thus beneficial to improving the printing appearance of the fish-tail grid line.

[0090] In the present embodiment, the fish-tail printing portion 121 comprises two bifurcated printing segments 1211 arranged in the second direction X, and the first filament 111 extends along the width direction of the bifurcated printing segment 1211 and is connected between the opposite side walls of the bifurcated printing segment 1211. In this way, the first filament 111 plays a pulling role on the bifurcated printing segment 1211, so as to effectively enhance the structural strength of the bifurcated printing segment 1211 arrangement area, reduce the risk of deformation of the bifurcated printing segment 1211 under stress, and be conducive to reducing the problem of thickening of the fish-tail grid line printing.

[0091] It should be noted that the bifurcated printing segment 1211 of the present application can be in a bent shape. In Figure 2 and Figure 3 , the bifurcated printing segment 1211 is in a bent shape, specifically in an L shape, and the bifurcated printing segment 1211 partially extends along the second direction X and partially extends along the first direction Y.

[0092] Of course, the bifurcated printing segment can also be in a straight line shape, and two straight line bifurcated printing segments are connected to form a fish-tail printing portion in a V shape.

[0093] Optionally, along the width direction of the first filament 111, at least one side edge of the first filament 111 is an arc-shaped edge E.

[0094] In the present embodiment, the arc-shaped edge E enables the screen body 10 to disperse stress through the first filament 111 during printing, thus enabling the screen body 10 to have higher structural strength and longer service life. When the first filament 111 is subjected to multiple deformations due to printing, the arc-shaped edge E can reduce the damaging stress on the first filament 111, thereby avoiding the expansion of micro-cracks inside the screen body 10, enhancing the fatigue resistance of the screen body 10, and prolonging the service life of the printing screen 1. Moreover, the arc-shaped edge E is also conducive to improving the shearing force of the paste and improving the ink transfer effect of the paste.

[0095] Further, along the width direction of the bifurcated printing segment 1211, the width of the first filament 111 narrows from the middle to the two ends. In this way, the narrower middle part of the first filament 111 has less shielding effect on the paste, which is conducive to improving the passability of the paste at this position. Moreover, the first filament 111 is connected to the screen body 10 by using the two wider ends to enhance the connection strength between the two, thereby enhancing the structural strength and service life of the printing screen 1.

[0096] In order to improve the printing effect of the intersection area of the second printing groove 13 and the fish-tail printing portion 121, the intersection area of the second printing groove 13 and the fish-tail printing portion 121 is arranged to be staggered with the reinforcing structure 11. In Figure 3In the embodiment, the intersection area of the second printing groove 13 and the fish-tail printing part 121 is arranged away from the first filament 111.

[0097] In this way, the intersection area of the second printing groove 13 and the fish-tail printing part 121 is not blocked by the reinforcing structure 11, and the ink of the paste can be applied well, which is beneficial to improve the printing effect of the intersection area of the second printing groove 13 and the fish-tail printing part 121, and the morphology of the intersection area of the printed current collecting grid line and the fish-tail grid line is good, which reduces the risk of the above-mentioned intersection area appearing broken grid, ghosting and other adverse printing phenomena, and is beneficial to form a good connection at the intersection of the current collecting grid line and the fish-tail grid line.

[0098] In some embodiments, the first printing groove 12 includes a pad printing part 122, and the size D1 of the pad printing part 122 in the second direction X is greater than the width W1 of the narrowest part of the second printing groove 13. The reinforcing structure 11 is arranged at least partially corresponding to the pad printing part 122.

[0099] In the embodiment, the pad printing part 122 is used for printing a pad, which is also called as a Pad point or a soldering point. The hollow part of the reinforcing structure 11 is in communication with the pad printing part 122 to structurally reinforce the pad printing part 122. In addition, the paste can pass through the hollow part of the reinforcing structure 11 to enter the pad printing part 122, so that the pad printing part 122 can be printed.

[0100] Optionally, the part of the reinforcing structure 11 arranged corresponding to the pad printing part 122 is selected from at least one of the honeycomb substructure 112 and the reticular substructure.

[0101] It can be understood that the pad printing part 122 is a large-size opening, that is, the size D1 of the pad printing part 122 in the second direction X is greater than the width W1 of the narrowest part of the second printing groove 13, and the geometric shapes of the honeycomb substructure 112 and the reticular substructure are beneficial to disperse stress, thereby having a good structural reinforcement effect, being suitable for structural reinforcement of a large-size opening, and being capable of effectively enhancing the pressure resistance and deformation resistance of the printing screen 1. In addition, a plurality of hollow parts are distributed on the honeycomb substructure 112 and the reticular substructure, which can be passed through by the paste. The paste passes through the plurality of hollow parts to enter the pad printing part 122, which is beneficial to uniform filling and shaping of the paste in the pad printing part 122, thereby making the pad printing part 122 have a good printing effect.

[0102] In some embodiments, please refer to Figure 2 and Figure 4 The first printing groove 12 includes a busbar grid line printing part 123, which extends along the first direction Y and intersects with at least a part of the number of second printing grooves 13. The width W2 of the busbar grid line printing part 123 in the second direction X is greater than the width W1 of the narrowest part of the second printing groove 13.

[0103] The reinforcing structure 11 is arranged at least partially corresponding to the busbar printing part 123, and the hollow part G of the reinforcing structure 11 is in communication with the busbar printing part 123.

[0104] In the embodiment, the busbar printing part 123 is used for printing busbars, which are also called main bars. The hollow part of the reinforcing structure 11 is in communication with the busbar printing part 123 to reinforce the structure of the busbar printing part 123. In addition, the paste can pass through the hollow part of the reinforcing structure 11 to enter the busbar printing part 123 to realize printing of the busbar printing part 123.

[0105] Optionally, the part of the reinforcing structure 11 arranged corresponding to the busbar printing part 123 is selected from at least one of the honeycomb substructure 112 and the reticular substructure.

[0106] It can be understood that the busbar printing part 123 is a large-size opening, that is, the width W2 of the busbar printing part 123 along the second direction X is greater than the width W1 of the narrowest part of the second printing groove 13, and the geometric shapes of the honeycomb substructure 112 and the reticular substructure are beneficial to dispersing stress, thereby having a good structure reinforcing effect, being suitable for structure reinforcing of a large-size opening, and being capable of effectively enhancing the compression resistance and deformation resistance of the printing screen 1. In addition, a plurality of hollow parts G are distributed on the honeycomb substructure 112 and the reticular substructure, and the plurality of hollow parts G are capable of allowing the paste to pass through. The paste passes through the plurality of hollow parts G to enter the busbar printing part 123, which is beneficial to uniform filling and shaping of the paste in the busbar printing part 123, thereby making the busbar printing part 123 have a good printing effect.

[0107] It should be noted that in the embodiment of the present application, the first printing groove 12 includes at least one of the busbar printing part 123, the fish-tail printing part 121, and the pad printing part 122. That is, the first printing groove 12 of the present application can have a plurality of variant structures, which will be described below in conjunction with examples.

[0108] In one of the examples, the first printing groove 12 includes the busbar printing part 123, the fish-tail printing part 121, and the pad printing part 122. The busbar printing part 123 extends along the first direction Y, and a part of the plurality of second printing grooves 13 intersects the busbar printing part 123. The fish-tail printing part 121 is arranged at at least one end of the busbar printing part 123 along the first direction Y, and a part of the plurality of second printing grooves 13 intersects the fish-tail printing part 121. The pad printing part 122 is connected to the busbar printing part 123.

[0109] The reinforcing structure 11 is at least partially corresponding to the busbar printing part 123, the fish printing part 121 and the pad printing part 122, and the hollow part G of the reinforcing structure 11 is in communication with the busbar printing part 123, the fish printing part 121 and the pad printing part 122.

[0110] In this example, the first printing groove 12 is used for printing busbar, fish and pad. Since the busbar printing part 123, the fish printing part 121 and the pad printing part 122 are connected, a longitudinal opening is formed on the printing screen 1, and the second printing groove 13 corresponds to a transverse opening, and the reinforcing structure 11 corresponds to the longitudinal opening and is arranged to effectively enhance the structural strength of the printing screen 1 at the longitudinal opening, and the paste passes through the hollow reinforcing structure 11 to realize printing in the longitudinal opening.

[0111] Considering that the opening width of the fish printing part 121 is generally narrow, in this application, the opening rate of the fish printing part 121 is greater than that of the busbar printing part 123, which is conducive to improving the paste passing property of the fish printing part 121 and further improving the printing effect of the fish printing part 121.

[0112] In another example, the first printing groove includes a pad printing part, but does not include a busbar printing part and a fish printing part. At this time, the printing screen is suitable for grid line printing of a busbar-free solar cell.

[0113] In yet another example, the first printing groove includes a busbar printing part and a fish printing part, but does not include a pad printing part. At this time, the printing screen is suitable for grid line printing of a solar cell with low welding requirements.

[0114] The second printing groove and the reinforcing structure of the embodiment of the application will be described in detail below.

[0115] In some embodiments, referring to Figure 2 and Figure 4 , along the second direction X, part of the second printing groove 13 is a structure reinforcing section 131, the width of the widest part of the structure reinforcing section 131 is W3, and the rest of the second printing groove 13 except the structure reinforcing section 131 is a main body printing section 132, the width of the narrowest part of the main body printing section 132 is W1; wherein W3> W1.

[0116] The reinforcing structure 11 is also arranged at the position where the main body 10 of the screen is provided with the structure reinforcing section 131, and the reinforcing structure 11 is partially hollow, and the hollow part G is in communication with each structure reinforcing section 131 respectively.

[0117] In view of the fact that the length of the second printing slot 13 also affects the structural strength of the printing screen 1, the reinforcing structure 11 locally reinforces the printing screen 1 through the structural reinforcing section 131 to enhance the structural strength of the printing screen 1 and prolong the service life of the printing screen 1.

[0118] In addition, in view of the fact that the reinforcing structure 11 blocks the paste to a certain extent, the second printing slot 13 is provided with the structural reinforcing section 131 which is widened at the position of the reinforcing structure 11, and the width W3 of the widest part of the structural reinforcing section 131 is greater than the width W1 of the narrowest part of the main printing section 132. In this way, the paste still has a good inking effect in the wider structural reinforcing section 131.

[0119] It can be understood that the narrowest part of the second printing slot 13 is the narrowest part of the main printing section 132, and the width W1 of the narrowest part of the main printing section 132 can be 3-15 μm. The width W3 of the widest part of the structural reinforcing section 131 can be 50-200 μm.

[0120] Further, the reinforcing structure 11 includes a plurality of second filaments 113 which are spaced apart along the second direction X, each second filament 113 being connected between opposite sides of the structural reinforcing section 131 along the first direction Y, and a hollow part G being formed between adjacent two second filaments 113. The second filament 113 is, for example, a steel wire. The hollow part G is formed by the spaced-apart second filaments 113 to avoid the formation of knots, and since the knots are the main cause of poor paste passing, the paste passing property of the structural reinforcing section 131 is better when there are no knots between the plurality of second filaments 113, thereby facilitating the improvement of the printing appearance of the current collector grid lines.

[0121] Among them, along the second direction X, at least one side edge of the second filament 113 is an arc-shaped edge E. The arc-shaped edge E allows the screen body 10 to disperse stress through the second filament 113 during printing, thereby allowing the screen body 10 to have higher structural strength and longer service life. When the second filament 113 is subjected to multiple deformations due to printing, the arc-shaped edge E can reduce the damage stress suffered by the second filament 113, thereby avoiding the expansion of micro-cracks in the screen body 10, thereby enhancing the fatigue resistance of the screen body 10 and prolonging the service life of the printing screen 1. In addition, the arc-shaped edge E is also conducive to improving the shear force of the paste and improving the inking effect of the paste.

[0122] And, along the first direction Y, the width of the second filament 113 narrows from the middle to the two ends. In this way, the narrower middle of the second filament 113 is less obstructive to the paste, which is conducive to improving the paste passability at this position. And, the second filament 113 is connected to the screen body 10 using the two wider ends to enhance the connection strength between the two, thereby improving the structural strength and service life of the printing screen 1.

[0123] Optionally, please refer to Figure 3 and Figure 4 , at least part of the number of second printing grooves 13 intersect with the bus bar printing part 123, or the extension line L of the bus bar printing part, and the intersection is provided with a structure reinforcing section 131.

[0124] That is, in this application, the structure reinforcing section 131 is used for the lap section of the printed bus bar, which intersects with the bus bar or the extension line of the bus bar. When the bus bar is welded, the solder strip is placed along the bus bar and welded with multiple lap sections. Due to the wider width of the lap section, it contains more silver, which is conducive to blocking the silver etching reaction of the solder strip, thereby reducing the risk of broken grid after welding.

[0125] Optionally, the opening rate of the structure reinforcing section 131 is greater than or equal to 30% and less than or equal to 70%, for example, 30%, 40%, 50%, 60% or 70%. When the structure reinforcing section 131 satisfies the above opening rate range, it indicates that there are enough reinforcing structures 11 provided on the structure reinforcing section 131, thereby effectively enhancing the printing screen 1 at the structure reinforcing section 131, which is conducive to prolonging the service life of the printing screen 1. And, the opening rate of the structure reinforcing section 131 is also high enough to make the paste pass through the structure reinforcing section 131 better, and the printing appearance is better.

[0126] Optionally, the opening rate of the main body printing section 132 is greater than or equal to 80% and less than or equal to 100%, for example, 80%, 90% or 100%. When the main body printing section 132 satisfies the above opening rate range, it indicates that the main body printing section 132 has less obstruction, better paste passability, and better paste shaping effect, which can print a bus bar main section with narrower line width and better appearance. Specifically, when the opening rate of the main body printing section 132 is 100%, the main body printing section 132 is a full opening printing groove in the art.

[0127] It should be noted that in this application, the opening rate can be tested by a screen detector.

[0128] The embodiment of the application discloses a method for manufacturing a printing screen, comprising the following steps:

[0129] Manufacturing reinforcing structure: manufacturing reinforcing structures on the substrate;

[0130] manufacturing the screen body: manufacturing the screen body with the first printing groove and the second printing groove on the substrate with the reinforcing structure; wherein the first printing groove extends along the first direction, the second printing groove extends along the second direction, the first direction intersects with the second direction; at least part of the second printing groove intersects with the first printing groove; the reinforcing structure is at least partially arranged at the position where the screen body is provided with the first printing groove, and the reinforcing structure is partially hollowed out and the hollowed-out part is in communication with the first printing groove.

[0131] The beneficial effects of the manufacturing method of the present application are described below.

[0132] The manufacturing method uses a step-by-step manufacturing method to manufacture the printing screen, specifically, the reinforcing structure is manufactured first, and then the screen body is manufactured. The reinforcing structure is manufactured separately, so that the characteristics of the reinforcing structure can be customized and adjusted, such as the material strength, size, etc. of the reinforcing structure. For example, the reinforcing structure can be made of high-strength metal, and the screen body can be made of low-cost metal. In this way, the printing screen manufactured by the manufacturing method can have high strength and low cost.

[0133] Moreover, the screen body manufactured by the manufacturing method is structurally reinforced at the position where the first printing groove is arranged by the reinforcing structure, so as to avoid the short service life of the printing screen, effectively reduce the cost of the solar cell in the printing process, simplify the printing process, and improve the production efficiency of the solar cell.

[0134] In some embodiments, please refer to Figures 5 to 8 wherein, Figures 5 to 8 (A) is a top view, and (B) is a side view. The step of manufacturing the reinforcing structure 11 includes:

[0135] manufacturing the first adhesive layer 21: manufacturing the first adhesive layer 21 on the local area of the non-conductive substrate 2;

[0136] depositing the first conductive layer 22: depositing the first conductive layer 22 on the side of the first adhesive layer 21 away from the substrate 2;

[0137] manufacturing the patterned second adhesive layer 23: manufacturing the patterned second adhesive layer 23 on the side of the first conductive layer 22 away from the first adhesive layer 21, so that the local area of the first conductive layer 22 is exposed to the second adhesive layer 23, and the exposed area of the first conductive layer 22 corresponds to the pattern of the reinforcing structure;

[0138] electrodepositing the reinforcing structure 11: electrodepositing the reinforcing structure 11 on the exposed area of the first conductive layer 22;

[0139] wherein the material of the non-conductive substrate 2 is, for example, glass, non-conductive resin or high polymer material.

[0140] The first adhesive layer 21 is, for example, ultraviolet light-cured adhesive (UV adhesive) or other types of non-conductive glue. The thickness of the first adhesive layer 21 is, for example, 2-15 μm. The first adhesive layer 21 can be made by coating or printing. The first adhesive layer 21 serves as a spacer, so that the subsequently made reinforcing structure 11 is at a distance from the substrate 2, so that the reinforcing structure 11 can be combined with the subsequently made screen body 10. The pattern of the first adhesive layer 21 should correspond to the pattern of the reinforcing structure setting area.

[0141] The material of the first conductive layer 22 is, for example, nickel-based alloy or copper alloy. The thickness of the first conductive layer 22 is, for example, 10-15 nm. The first conductive layer 22 can be deposited by, for example, PVD (Physical Vapor Deposition). The first conductive layer 22 serves as a conductive base for electrodepositing the reinforcing structure 11.

[0142] The second adhesive layer 23 can be ultraviolet light-cured adhesive (UV adhesive) or other types of non-conductive glue. The second adhesive layer 23 can be made by coating or printing. After the second adhesive layer 23 is set on the first conductive layer 22, the pattern of the exposed area of the first conductive layer 22 is the same as that of the reinforcing structure 11. In this way, the exposed area of the first conductive layer 22 can be provided with the reinforcing structure 11 by electrodepositing, for example, electroforming.

[0143] Since the reinforcing structure 11 is made separately, the characteristics of the reinforcing structure 11 can be customized, such as the material strength and size of the reinforcing structure 11.

[0144] In some embodiments, referring to Figure 9 , the step of making the screen body 10 comprises:

[0145] Making the third adhesive layer 24: referring to Figure 9 (A), the third adhesive layer 24 is made on a partial area of the substrate 2. The pattern of the third adhesive layer 24 corresponds to the pattern of the first printing slot and the second printing slot. Part of the third adhesive layer 24 covers the side of the reinforcing structure 11 away from the substrate 2.

[0146] Depositing the second conductive layer 25: referring to Figure 9 (A) and (B), the second conductive layer 25 is deposited on the area of the substrate 2 except the third adhesive layer 24.

[0147] Electrodepositing the screen body 10: referring to Figure 9 (B), (C) and (D), the screen body 10 is electrodeposited on the second conductive layer 25.

[0148] The third adhesive layer 24 can be ultraviolet curing adhesive (UV adhesive) or other types of non-conductive glue. The third adhesive layer 24 can be made by coating or printing. One of the functions of the third adhesive layer 24 is to shield the reinforcing structure 11. In addition, the pattern of the third adhesive layer 24 corresponds to the patterns of the first and second printing grooves, so that no metal is deposited on the surface of the third adhesive layer 24 when metal is deposited subsequently, thereby forming the first and second printing grooves 12 and 13.

[0149] The second conductive layer 25 is made of, for example, nickel-based alloy or copper alloy, and has a thickness of 10-15 nm. The second conductive layer 25 is deposited by, for example, PVD (Physical Vapor Deposition). The second conductive layer 25 is used to provide a conductive base for the electro-deposited screen body 10. One or more layers of alloy are electro-deposited on the second conductive layer 25 to form the screen body 10, for example, nickel alloy, i.e., the screen body 10 is made of alloy material as a whole. In addition, since the reinforcing structure 11 is not covered by the third adhesive layer 24 on both sides in the horizontal direction, when the alloy material of the screen body 10 is deposited to the height of the reinforcing structure 11, the alloy material of the screen body 10 is combined with the alloy material of the reinforcing structure 11 to connect the screen body 10 and the reinforcing structure 11 to form the printing screen.

[0150] In more detail, after the screen body is completed, the first, second and third adhesive layers and the first conductive layer need to be removed. The adhesive layers can be removed by, for example, heating or using adhesive remover. The first conductive layer can be removed by, for example, heat treatment and ultrasonic cleaning.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements to some or all of the technical features. Such modifications or replacements do not change the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A printing screen, characterized in that, include: The screen printing body is provided with a first printing groove and a plurality of second printing grooves spaced apart along a first direction, each of the second printing grooves extending along a second direction, the first direction intersecting the second direction; At least a portion of the second printing grooves intersect with the first printing grooves; as well as The reinforcing structure is at least partially disposed at the position where the first printing groove is located on the screen body, and the reinforcing structure is partially hollowed out, with the hollowed-out part communicating with the first printing groove.

2. The printing screen according to claim 1, characterized in that, At least partially, the width of the first printing groove along the second direction is greater than the width W1 at the narrowest point of the second printing groove.

3. The printing screen according to claim 1, characterized in that, The first printing groove includes a harpoon printing section, and at least a portion of the second printing groove intersects with the harpoon printing section; The reinforcing structure is at least partially corresponding to the harpoon printing section, and the hollowed-out portion of the reinforcing structure is connected to the harpoon printing section.

4. The printing screen according to claim 3, characterized in that, The reinforcing structure includes multiple first filaments, which are spaced apart in the area of ​​the harpoon printing section, with a cutout formed between two adjacent first filaments.

5. The printing screen according to claim 4, characterized in that, The harpoon printing section includes two bifurcated printing segments spaced apart in the second direction, wherein the first filament extends along the width direction of the bifurcated printing segments and connects between the opposite sidewalls of the bifurcated printing segments; and / or, Along the width direction of the first filament, at least one edge of the first filament is an arc-shaped edge; and / or, Along the width direction of the bifurcated printing segment, the width of the first filament narrows from the middle to both ends.

6. The printing screen according to claim 3, characterized in that, The intersection area of ​​the second printing groove and the harpoon printing section is offset from the reinforcing structure.

7. The printing screen according to claim 1, characterized in that, The first printing groove includes a pad printing section, wherein the dimension D1 of the pad printing section along the second direction is greater than the width W1 at the narrowest point of the second printing groove; The reinforcing structure is at least partially corresponding to the solder pad printing portion, and the hollow portion of the reinforcing structure is connected to the solder pad printing portion.

8. The printing screen according to claim 7, characterized in that, The portion of the reinforcing structure corresponding to the printed pad is selected from at least one of honeycomb substructure and mesh substructure.

9. The printing screen according to claim 1, characterized in that, The first printing groove includes a busbar printing section, which extends along the first direction and intersects with at least a portion of the second printing grooves. The width W2 of the busbar printing section along the second direction is greater than the width W1 at the narrowest point of the second printing groove. The reinforcing structure is at least partially corresponding to the busbar printing section, and the hollowed-out portion of the reinforcing structure is connected to the busbar printing section. The portion of the reinforcing structure corresponding to the printed portion of the busbar is selected from at least one of a honeycomb substructure and a mesh substructure.

10. The printing screen according to claim 1, characterized in that, The first printing tank includes: The busbar printing section extends along the first direction, and a portion of the second printing grooves intersect with the busbar printing section; A harpoon printing section is disposed at at least one end of the busbar printing section along the first direction, the aperture ratio of the harpoon printing section is greater than the aperture ratio of the busbar printing section, and a portion of the second printing grooves intersect with the harpoon printing section; and The pad printing section is connected to the busbar printing section; The reinforcing structure is at least partially corresponding to the busbar printing section, the harpoon printing section, and the pad printing section, and the hollowed-out portion of the reinforcing structure is connected to the busbar printing section, the harpoon printing section, and the pad printing section.

11. The printing screen according to claim 1, characterized in that, Along the second direction, a portion of the second printing groove is a structural reinforcement section, the widest part of which is W3; the remaining portion of the second printing groove, excluding the structural reinforcement section, is the main printing section, the narrowest part of which is W1; wherein, W3 > W1; The reinforcing structure is also provided at the position where the reinforcing section is provided on the main body of the screen, and the reinforcing structure is partially hollowed out, with the hollowed-out parts respectively connected to each of the reinforcing sections.

12. The printing screen according to claim 11, characterized in that, The reinforcing structure includes multiple second filaments spaced apart along the second direction, each second filament being connected between opposite sides of the reinforcing section of the structure along the first direction, and a hollow space being formed between two adjacent second filaments.

13. The printing screen according to claim 12, characterized in that, Along the second direction, at least one edge of the second filament is an arc-shaped edge; and / or, Along the first direction, the width of the second filament narrows from the middle to both ends.

14. The printing screen according to claim 11, characterized in that, The first printing groove includes a busbar printing section extending along the first direction, and at least a portion of the second printing grooves intersect with the busbar printing section or the extension line of the busbar printing section, and the structural reinforcement section is provided at the intersection. And / or, The opening ratio of the structural reinforcement section is greater than or equal to 30% and less than or equal to 70%; and / or, The aperture ratio of the main printed section is greater than or equal to 80% and less than or equal to 100%.

15. A method for manufacturing a printing screen, characterized in that, Includes the following steps: Fabrication of the reinforcing structure: Fabrication of the reinforcing structure on the substrate; Fabrication of the screen printing plate body: The screen printing plate body having a first printing groove and a second printing groove is fabricated on the substrate having the reinforcing structure; wherein, the first printing groove extends along a first direction, the second printing groove extends along a second direction, and the first direction and the second direction intersect; at least a portion of the second printing grooves intersect with the first printing grooves; the reinforcing structure is at least partially disposed at the position where the first printing groove is located on the screen printing plate body, and the reinforcing structure is partially hollowed out, and the hollowed-out part is connected to the first printing groove.

16. The manufacturing method according to claim 15, characterized in that, The steps for fabricating the reinforcing structure include: Fabrication of the first adhesive layer: The first adhesive layer is fabricated on a localized area of ​​the non-conductive substrate; Depositing the first conductive layer: Depositing the first conductive layer on the side of the first adhesive layer opposite to the substrate; Fabricating a patterned second adhesive layer: A patterned second adhesive layer is fabricated on the side of the first conductive layer opposite to the first adhesive layer, so that a local area of ​​the first conductive layer is exposed in the second adhesive layer, and the exposed area of ​​the first conductive layer corresponds to the pattern of the reinforcing structure. Electrodeposition of the reinforcing structure: The reinforcing structure is electrodeposited on the exposed area of ​​the first conductive layer; And / or, The steps for creating the main screen layout include: Fabricating a third adhesive layer: The third adhesive layer is fabricated on a local area of ​​the substrate; wherein the pattern of the third adhesive layer corresponds to the pattern of the first printing groove and the second printing groove connected together, and a portion of the third adhesive layer covers the side of the reinforcing structure opposite to the substrate; Deposit a second conductive layer: Deposit a second conductive layer on the substrate in the region excluding the third adhesive layer; Electrodeposition of the screen substrate: The screen substrate is electrodeposited on the second conductive layer.

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