Double-sided laser transfer film, grooving mold and laser transfer system

Abstract

The utility model relates to a double-sided laser transfer printing film, a grooving mold and a laser transfer printing system, the transfer printing film is provided with a first surface and a second surface which are opposite in position, the first surface is provided with a plurality of first grooves, the second surface is provided with a plurality of second grooves, and the first grooves and the second grooves are respectively used for filling slurry. The first surface is provided with a plurality of first grooves, the second surface is provided with a plurality of second grooves, in actual use, the first grooves are firstly filled with slurry, and then the slurry in the first grooves is subjected to laser transfer printing to a battery piece to form a grid line; and filling the second groove with slurry, and then carrying out laser transfer printing on the slurry in the second groove to the battery piece to form a grid line. The use frequency of the transfer printing film can be increased through the arrangement of the first groove and the second groove, and therefore the cost of the transfer printing film is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cell production and manufacturing, and in particular to a double-sided laser transfer film, a slotting mold, and a laser transfer system. Background Art

[0002] Surface metallization is one of the key steps in the preparation of photovoltaic cells. It is a major difficulty that affects the efficiency, cost and performance of photovoltaic cells. It plays a vital role in reducing the cost and improving the efficiency of photovoltaic cells. The metallization process is divided into contact and non-contact. The contact type is different types of screen printing, and the non-contact type includes laser transfer, electroplating, inkjet printing technology, etc. that are being explored. Combining several technologies, laser transfer has more advantages in saving silver paste, improving efficiency, and reducing fragmentation rate.

[0003] However, the cost of transfer film has always been the reason why laser transfer cannot be mass-produced. Reducing the cost of transfer film can make this metallization method more quickly mass-produced. Utility Model Content

[0004] Based on this, it is necessary to provide a double-sided laser transfer film, a slotting mold and a laser transfer system to address the problem that the transfer film is high in cost and cannot be mass-produced.

[0005] A double-sided laser transfer film comprises a transfer film, wherein the transfer film has a first surface and a second surface that are opposite to each other, the first surface has a plurality of first grooves, the second surface has a plurality of second grooves, and the first grooves and the second grooves are respectively used for filling slurry.

[0006] In one embodiment, a first interval is formed between two adjacent first grooves, a second interval is formed between two adjacent second grooves, the first groove is arranged opposite to the second interval, and the second groove is arranged opposite to the first interval.

[0007] In one embodiment, the bottom size of the first groove and the second groove are both larger than the groove opening size, and the shapes of the first groove and the second groove include at least one of an arc, a trapezoid, a triangle, and a rectangle.

[0008] In one embodiment, the thickness of the transfer film is 200±100 μm, the depth of the first groove and the second groove ranges from 5 μm to 40 μm, the width of the first groove and the second groove ranges from 5 μm to 40 μm, and the length of the first interval or the second interval is 100 μm to 300 μm.

[0009] A slotting mold comprises a first mold and a second mold, wherein the first mold is provided with a first protrusion, and the second mold is provided with a second protrusion, and the first mold and the second mold are used to clamp a transfer film in the middle, so that a first groove is formed on the first surface of the transfer film through the first protrusion, and a second groove is formed on the second surface of the transfer film through the second protrusion.

[0010] In one embodiment, when the first mold and the second mold clamp the transfer film in between, the first protrusion and the second protrusion are offset from each other.

[0011] A laser transfer system, comprising a winding drum, an unwinding drum, a first roller unit and a second roller unit, wherein a transfer film is wound on the unwinding drum, one end of the transfer film is wound on the winding drum after being guided by the first roller unit and the second roller unit in sequence, the first roller unit and the second roller unit are used to be arranged on a battery cell, the first roller unit is used to make the first surface of the transfer film face the first battery cell, and the first roller unit is used to make the second surface of the transfer film face the second battery cell.

[0012] In one embodiment, the first roller unit includes at least a first roller and a second roller, the transfer film includes a first transfer film segment, the first transfer film segment is wound around the first roller and the second roller, and the first surface of the first transfer film segment is used to face the first battery sheet;

[0013] The laser transfer system includes a first laser generator, and the first laser generator is arranged on one side of the second surface of the first transfer film segment.

[0014] In one embodiment, the second roller unit at least includes a third roller, a fourth roller and a fifth roller, the transfer film is sequentially wound around the second roller, the third roller, the fourth roller and the fifth roller, the transfer film includes a second transfer film segment, the second transfer film segment is wound around the fourth roller and the fifth roller, the third roller is located on one side of the first surface of the second transfer film segment, and the second surface of the second transfer film segment faces the second battery sheet;

[0015] The laser transfer system comprises a second laser generator, which is arranged on one side of the first surface of the second transfer film segment and located between the third roller and the second transfer film segment.

[0016] In one embodiment, the first roller unit includes a first scraper, and the first scraper is used to fill the slurry onto the first surface. The second roller unit includes a second scraper, and the second scraper is used to fill the slurry onto the second surface.

[0017] The above-mentioned double-sided laser transfer film, slotted mold and laser transfer system have a plurality of first grooves on the first side and a plurality of second grooves on the second side. In actual use, the first grooves are first filled with slurry, and then the slurry in the first grooves is laser transferred to the battery cell to form grid lines; then the second grooves are filled with slurry, and then the slurry in the second grooves is laser transferred to the battery cell to form grid lines. That is, the provision of the first grooves and the second grooves can increase the number of times the transfer film can be used, thereby reducing the cost of the transfer film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic diagram of the structure of a transfer film and a slotting mold in one embodiment.

[0019] FIG. 2 is a system diagram of a laser transfer system in one embodiment.

[0020] Reference numerals: 100, transfer film; 110, first surface; 111, first groove; 112, first interval; 120, second surface; 121, second groove; 122, second interval; 130, first transfer film segment; 140, second transfer film segment;

[0021] 210, first mold; 211, first protrusion; 220, second mold; 221, second protrusion;

[0022] 310, winding drum; 320, unwinding drum; 330, first roller unit; 331, first roller; 332, second roller; 340, second roller unit; 341, third roller; 342, fourth roller; 343, fifth roller; 344, sixth roller; 350, first laser generator; 360, second laser generator; 370, first scraper; 380, second scraper;

[0023] 410, a first battery cell; 420, a second battery cell. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0030] Referring to FIG. 1 , a double-sided laser transfer film provided in one embodiment of the present application includes a transfer film 100, wherein the transfer film 100 has a first surface 110 and a second surface 120 which are opposite to each other, wherein the first surface 110 has a plurality of first grooves 111, and the second surface 120 has a plurality of second grooves 121, wherein the first grooves 111 and the second grooves 121 are respectively used for filling slurry.

[0031] In the present embodiment, the transfer film 100 is a thin film structure, so the transfer film 100 has a front side and a back side that are relatively located, wherein the first side 110 can refer to the front side, and the second side 120 can refer to the back side. The first side 110 has a plurality of first grooves 111, and the second side 120 has a plurality of second grooves 121. In actual use, the first grooves 111 are first filled with slurry, and then the slurry in the first grooves 111 is laser transferred to the battery cell to form a grid line; the second grooves 121 are then filled with slurry, and then the slurry in the second grooves 121 is laser transferred to the battery cell to form a grid line. That is, the provision of the first grooves 111 and the second grooves 121 can increase the number of times the transfer film 100 is used, thereby reducing the cost of the transfer film 100.

[0032] In some embodiments, a first interval 112 is formed between two adjacent first grooves 111 , a second interval 122 is formed between two adjacent second grooves 121 , the first groove 111 and the second interval 122 are arranged opposite to each other, and the second groove 121 and the first interval 112 are arranged opposite to each other.

[0033] That is, the first groove 111 and the second groove 121 are staggered, which can further reduce the thickness of the transfer film 100 ; and can also prevent the laser from irradiating the second groove 121 when the slurry in the first groove 111 is transferred.

[0034] In some other embodiments, when the total thickness of the transfer film 100 is greater than the depth of the first groove 111 and the depth of the second groove 121 , the first groove 111 and the second groove 121 may be arranged opposite to each other.

[0035] In some embodiments, the bottom size of the first groove 111 and the second groove 121 are both larger than the groove opening size, and the shapes of the first groove 111 and the second groove 121 include at least one of an arc, a trapezoid, a triangle, and a rectangle.

[0036] The bottom size of the first groove 111 and the second groove 121 are both larger than the groove opening size, which is convenient for slurry filling and laser transfer.

[0037] Specifically, the thickness of the transfer film 100 is 200±100 μm, the depth of the first groove 111 and the second groove 121 is 5 μm-40 μm, the width of the first groove 111 and the second groove 121 is 5 μm-40 μm, and the length of the first interval 112 or the second interval 122 is 100 μm-300 μm.

[0038] An embodiment of the present application discloses a slotting mold, which includes a first mold 210 and a second mold 220. The first mold 210 is provided with a first protrusion 211, and the second mold 220 is provided with a second protrusion 221. The first mold 210 and the second mold 220 are used to clamp the transfer film 100 in the middle, so as to form a first groove 111 on the first side 110 of the transfer film 100 through the first protrusion 211, and to form a second groove 121 on the second side 120 of the transfer film 100 through the second protrusion 221.

[0039] During the actual grooving, the transfer film 100 is clamped in the middle by the first mold 210 and the second mold 220 respectively to squeeze the transfer film 100. At the same time, since the first mold 210 is provided with a first protrusion 211 and the second mold 220 is provided with a second protrusion 221, the first groove 111 and the second groove 121 can be respectively opened on the front and back sides of the transfer film 100 at the same time. The process is simple and the grooving efficiency is high.

[0040] Specifically, the transfer film 100 is generally made of plastic, and the mold is made of metal. When the grooves are cut, the first protrusion 211 and the second protrusion 221 can be heated to heat and squeeze the transfer film 100 to cut the grooves.

[0041] In some embodiments, when the first mold 210 and the second mold 220 clamp the transfer film 100 therebetween, the first protrusion 211 and the second protrusion 221 are offset from each other.

[0042] When the first mold 210 and the second mold 220 are used to make grooves, the first groove 111 and the second groove 121 can be staggered at the same time.

[0043] Referring to FIG. 2 , an embodiment of the present application discloses a laser transfer system, which includes a winding reel 310, an unwinding reel 320, a first roller unit 330 and a second roller unit 340. A transfer film 100 is wound on the unwinding reel 320, and one end of the transfer film 100 is guided by the first roller unit 330 and the second roller unit 340 in sequence and then wound on the winding reel 310. The first roller unit 330 and the second roller unit 340 are used to be arranged above the battery cell. The first roller unit 330 is used to make the first surface 110 of the transfer film 100 face the first battery cell 410, and the first roller unit 330 is used to make the second surface 120 of the transfer film 100 face the second battery cell 420.

[0044] In actual use, the winding reel 310 and the unwinding reel 320 rotate simultaneously, the unwinding reel 320 rotates to provide the transfer film 100, and the winding reel 310 rotates to recycle the used transfer film 100. A plurality of rollers are arranged between the winding reel 310 and the unwinding reel 320 to change the direction of the transfer film 100.

[0045] In this embodiment, the battery cell is placed on a conveyor belt, and the laser transfer system is arranged above the battery cell. Through the guiding action of the first roller unit 330 and the second roller unit 340, the first surface 110 and the second surface 120 of the transfer film 100 can both face the battery cell, so that the battery cell can be laser transferred through the slurry in the first groove 111 and the slurry in the second groove 121 respectively.

[0046] In some embodiments, the first roller unit 330 includes at least a first roller 331 and a second roller 332, and the transfer film 100 includes a first transfer film segment 130, which is arranged around the first roller 331 and the second roller 332, and the first surface 110 of the first transfer film segment 130 is used to face the first battery sheet 410. The laser transfer system includes a first laser generator 350, which is arranged on one side of the two surfaces of the first transfer film segment 130.

[0047] In some embodiments, the second roller unit 340 includes at least a third roller 341, a fourth roller 342, and a fifth roller 343. The transfer film 100 is sequentially wound around the second roller 332, the third roller 341, the fourth roller 342, and the fifth roller 343. The transfer film 100 includes a second transfer film segment 140, which is wound around the fourth roller 342 and the fifth roller 343. The third roller 341 is located on one side of the first surface 110 of the second transfer film segment 140, and the second surface 120 of the second transfer film segment 140 faces the second battery cell 420. The laser transfer system includes a second laser generator 360, which is disposed on one side of the first surface 110 of the second transfer film segment 140 and between the third roller 341 and the second transfer film segment 140.

[0048] The second roller unit 340 further includes a sixth roller 344, wherein the unwinding drum 320, the first roller 331, the second roller 332 and the sixth roller 344 are sequentially connected end to end to form a trapezoidal structure, and the sixth roller 344, the third roller 341, the fourth roller 342 and the fifth roller 343 are sequentially connected end to end to form a parallelogram structure, that is, the first roller unit 330 is arranged so that the side of the transfer film 100 outside the trapezoidal structure is the first side 110, and the second roller unit 340 is arranged so that the side of the transfer film 100 outside the parallelogram structure is the second side 120. The bottom sides of the trapezoidal structure and the parallelogram structure are flush, the first battery cell 410 is located outside the trapezoidal structure, and the second battery cell 420 is located outside the parallelogram structure.

[0049] The first laser generator 350 is located in the trapezoidal structure. When the first laser generator 350 emits laser toward the first transfer film segment 130, the slurry located in the first surface 110 can be transferred to the first battery cell 410. The second laser generator 360 is located in the parallelogram structure. When the second laser generator 360 emits laser toward the second transfer film segment 140, the slurry located in the second surface 120 can be transferred to the second battery cell 420.

[0050] It should be noted that the first battery cell 410 and the second battery cell 420 are the same battery cells, but are placed in different positions.

[0051] The trapezoidal structure here can be other quadrilateral structures, such as parallelograms and rectangles, and the parallelogram structure can be triangles or other quadrilateral structures, such as triangles, trapezoids, and rectangles. Of course, when the number of rollers in the first roller unit 330 increases, the trapezoidal structure here can also be other polygonal structures; of course, when the number of rollers in the second roller unit 340 increases, the parallelogram structure here can also be other polygonal structures.

[0052] In some embodiments, the first roller unit 330 includes a first scraper 370 for filling the slurry onto the first surface 110 , and the second roller unit 340 includes a second scraper 380 for filling the slurry onto the second surface 120 .

[0053] Specifically, the first scraper 370 is located outside the trapezoidal structure and between the unwinding drum 320 and the first roller 331. The first scraper 370 is used to fill the slurry into the first surface 110. After the slurry is filled, the transfer film 100 moves between the first roller 331 and the second roller 332. At this time, the first laser generator 350 can transfer the slurry in the first groove 111 to the first battery cell 410.

[0054] The second scraper 380 is located outside the parallelogram structure and between the third roller 341 and the fourth roller 342. The second scraper 380 is used to fill the slurry into the second surface 120. After the slurry is filled, the transfer film 100 moves to between the fourth roller 342 and the fifth roller 343. At this time, the second laser generator 360 can transfer the slurry in the second groove 121 to the second battery cell 420.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A double-sided laser transfer film, characterized in that: The double-sided laser transfer film comprises a transfer film having a first surface and a second surface opposite to each other, the first surface having a plurality of first grooves, the second surface having a plurality of second grooves, the first grooves and the second grooves being respectively used for filling slurry.

2. The double-sided laser transfer film according to claim 1, characterized in that: A first interval is formed between two adjacent first grooves, and a second interval is formed between two adjacent second grooves. The first groove is arranged opposite to the second interval, and the second groove is arranged opposite to the first interval.

3. The double-sided laser transfer film according to claim 1, characterized in that: The bottom size of the first groove and the second groove is larger than the groove opening size, and the shapes of the first groove and the second groove include at least one of an arc, a trapezoid, a triangle, and a rectangle.

4. The double-sided laser transfer film according to claim 2, characterized in that: The thickness of the transfer film is 200±100 μm, the depth of the first groove and the second groove ranges from 5 μm to 40 μm, the width of the first groove and the second groove ranges from 5 μm to 40 μm, and the length of the first interval or the second interval is from 100 μm to 300 μm.

5. A slotting die, characterized in that: The slotting mold includes a first mold and a second mold, the first mold is provided with a first protrusion, the second mold is provided with a second protrusion, the first mold and the second mold are used to clamp the transfer film in the middle, so that the first protrusion forms a first groove on the first side of the transfer film, and the second protrusion forms a second groove on the second side of the transfer film.

6. The slotting die according to claim 5, characterized in that: When the first mold and the second mold clamp the transfer film in between, the first protrusion and the second protrusion are offset from each other.

7. A laser transfer system, characterized in that: The laser transfer system includes a winding drum, an unwinding drum, a first roller unit and a second roller unit. A transfer film is wound on the unwinding drum. One end of the transfer film is wound on the winding drum after being guided by the first roller unit and the second roller unit in sequence. The first roller unit and the second roller unit are used to be arranged on the battery cell. The first roller unit is used to make the first surface of the transfer film face the first battery cell, and the first roller unit is used to make the second surface of the transfer film face the second battery cell.

8. The laser transfer system according to claim 7, characterized in that: The first roller unit at least includes a first roller and a second roller, the transfer film includes a first transfer film segment, the first transfer film segment is wound around the first roller and the second roller, and the first surface of the first transfer film segment is used to face the first battery sheet; The laser transfer system includes a first laser generator, and the first laser generator is arranged on one side of the second surface of the first transfer film segment.

9. The laser transfer system according to claim 7, characterized in that: The second roller unit at least includes a third roller, a fourth roller and a fifth roller, the transfer film is sequentially wound around the second roller, the third roller, the fourth roller and the fifth roller, the transfer film includes a second transfer film segment, the second transfer film segment is wound around the fourth roller and the fifth roller, the third roller is located on one side of the first surface of the second transfer film segment, and the second surface of the second transfer film segment faces the second battery sheet; The laser transfer system comprises a second laser generator, which is arranged on one side of the first surface of the second transfer film segment and located between the third roller and the second transfer film segment.

10. The laser transfer system according to claim 7, characterized in that: The first roller unit includes a first scraper, and the first scraper is used to fill the slurry onto the first surface. The second roller unit includes a second scraper, and the second scraper is used to fill the slurry onto the second surface.

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