A flexible mask and cell piece alignment method and system

Abstract

The application discloses a flexible mask and cell piece alignment method and an alignment system, relates to the technical field of solar cells, and is used for solving the problem of poor alignment accuracy of the flexible mask and the cell piece. The alignment method comprises the following steps: providing a cell piece, which is provided with at least two alignment marks; placing a flexible mask on a laser scribing platform; based on a first coordinate system in which the flexible mask is located, using a laser to scribe at least two reference marks and a mask pattern on the flexible mask, wherein the reference marks are used for alignment with the alignment marks; based on a corresponding relationship between the first coordinate system and a second coordinate system, moving the laser scribing platform under the first coordinate system, so that the reference marks are moved to a first target position, and moving the cell piece under the second coordinate system generated by an image recognition device, the image recognition device recognizes the positions of the alignment marks, so that the alignment marks are moved to a second target position, and the coordinates of the two target positions in the two coordinate systems are consistent; and attaching the cell piece to the flexible mask.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and in particular to a method and system for aligning a flexible mask with a solar cell. Background Technology

[0002] In the fabrication of solar cells, patterned flexible masks are used to create patterned films, such as metal electrodes. Specifically, after the flexible mask is patterned, the solar cell is aligned with the mask pattern, and the mask is attached to the cell surface. Next, a metal layer is deposited on the patterned mask. Finally, the mask is removed to form the metal electrodes. The location of the patterned films on the solar cell is crucial. However, current technology uses image recognition devices to identify contrast marks on both the solar cell and the flexible mask, then uses these marks to align the cell with the mask. This current alignment method requires the combined error of the two image recognition steps to achieve the correct positioning accuracy. If the accuracy of the two steps is ±50μm and ±30μm respectively, the final alignment deviation is ±80μm, which fails to meet the accuracy requirements for the alignment of the flexible mask and the solar cell. Summary of the Invention

[0003] The purpose of this invention is to provide a method and system for aligning a flexible mask and a battery cell to improve alignment accuracy.

[0004] In a first aspect, the present invention provides a method for aligning a flexible mask with a battery cell, comprising:

[0005] A solar cell is provided, having at least two alignment marks on it;

[0006] Then, the flexible mask is placed on the laser scribing platform. Based on the first coordinate system where the laser scribing platform is located, at least two reference marks are scribed on the flexible mask using a laser, and the flexible mask is patterned to form a mask pattern. The reference marks are used to align with the alignment marks.

[0007] Then, based on the correspondence between the first coordinate system and the second coordinate system, the laser scribing platform carrying the flexible mask is moved in the first coordinate system to move the reference mark to the first target position, and the battery cell is moved in the second coordinate system generated by the image recognition device. During the movement of the battery cell, the image recognition device identifies the position of the alignment mark and moves the alignment mark to the second target position. The coordinates of the first target position and the second target position are consistent in the first coordinate system and the second coordinate system, thus completing the alignment of the reference mark and the alignment mark.

[0008] Then, the battery cell is moved along the direction from the second target position to the first target position so that it adheres to the flexible mask.

[0009] Using the above technical solution, a laser scribing platform is used to scribble reference marks and pattern the flexible mask to form a mask pattern. Because the laser scribing platform has higher positioning accuracy, the positional accuracy of the obtained reference marks and mask pattern can reach approximately 1 μm. Furthermore, by moving the laser scribing platform carrying the flexible mask within the first coordinate system, the reference marks are moved to the first target position for alignment. Due to the higher positioning accuracy of the laser scribing platform itself and the first coordinate system, the positional accuracy of the moved first target position is even higher, improving the positional accuracy of the flexible mask moving to the alignment position, achieving a positional accuracy of approximately 1 μm. Since the image recognition device only performs one-step recognition of the alignment marks on the solar cell and moves the alignment marks to the second target position in the second coordinate system generated by the image recognition device, the positioning accuracy of the image recognition device itself and the positioning accuracy of the second coordinate are within ±50μm. Combining the positioning accuracy of the laser scribing platform and the image recognition device, the final alignment accuracy between the flexible mask and the solar cell can reach ±51μm. Compared with the existing alignment method that performs two-step image recognition on the mask and the solar cell, this application utilizes the high precision of the laser scribing platform itself, eliminates the image recognition positioning of the flexible mask, and only performs one recognition positioning through the image recognition device, thereby improving the final alignment accuracy between the flexible mask and the solar cell.

[0010] In some possible implementations, the process of establishing the correspondence between the first coordinate system and the second coordinate system includes: first, placing the replacement sheet on the laser scribing platform; then, based on the first coordinate system where the laser scribing platform is located, using a laser to scribing at least two first reference marks on the replacement sheet, the positions of the first reference marks being able to correspond one-to-one with the positions of the reference marks, the first reference marks being used to align with the second reference marks on the battery cell; then, moving the laser scribing platform carrying the replacement sheet to the alignment position, so that the first reference marks move to the first reference coordinates in the first coordinate system; then, recognizing the first reference marks through an image recognition device and obtaining the second reference coordinates of the first reference marks in the second coordinate system, using the second reference coordinates as the coordinates of the second reference marks when they are in the alignment position in the second coordinate system, thus completing the establishment of the correspondence between the first coordinate system and the second coordinate system.

[0011] By employing the above technical solution, leveraging the high positioning accuracy of the laser marking platform and the high accuracy of the first coordinate system, the first reference coordinates of the first reference mark at its alignment position in the first coordinate system are first determined. Based on the high positioning accuracy at the alignment position of the first reference mark, the second reference coordinates of the first reference mark in the second coordinate system generated by the image recognition device are obtained. A correspondence between the first and second coordinate systems is established using the same first reference mark. Subsequently, the second reference coordinates in the second coordinate system can be used as a reference for the coordinates of the alignment mark in the second coordinate system. It is evident that establishing the correspondence between the first and second coordinate systems is based on the high positioning accuracy of the laser marking platform, making the correspondence between the first and second coordinate systems more precise, thereby improving alignment accuracy.

[0012] In some possible implementations, identifying the first reference mark located at the first reference coordinate by an image recognition device includes: first, translating the substitute sheet away from the laser scribe platform in a direction perpendicular to the bearing surface of the laser scribe platform; then, moving the laser scribe platform away in a direction parallel to the bearing surface of the laser scribe platform; and then, identifying the first reference mark from below the substitute sheet by an image recognition device located below the laser scribe platform.

[0013] In the above technical solution, to facilitate the arrangement of the image recognition device, the laser marking platform, and the mechanism for moving the battery cell, and to facilitate the image recognition device's identification of the battery cell, the image recognition device is positioned below the laser marking platform, and the mechanism for moving the battery cell is positioned above the laser marking platform. This allows the image recognition device to identify the alignment marks on the battery cell from below, and the position of the image recognition device does not interfere with the movement of the battery cell. Therefore, based on this arrangement, when establishing the alignment reference using a replacement sheet, since the replacement sheet is placed on the laser marking platform, the laser marking platform will obstruct the image recognition device when it identifies the first reference mark on the replacement sheet. Therefore, without changing the horizontal position of the replacement sheet, it is necessary to move the replacement sheet upwards away from the laser marking platform, and then move the laser marking platform horizontally away, so that there is no obstruction between the image recognition device and the replacement sheet, facilitating identification.

[0014] In some possible implementations, the shape of the first reference mark is the same as that of both the reference mark and the alignment mark. This arrangement allows for more accurate identification and alignment of marks with the same shape.

[0015] In some possible implementations, the replacement sheet is a transparent sheet, and the first reference mark is disposed through the thickness direction of the replacement sheet or on the surface of the replacement sheet away from the laser scribing platform; or, the replacement sheet is a non-transparent sheet, and the first reference mark is disposed through the thickness direction of the replacement sheet. With this configuration, the image recognition device can identify the first reference mark from below the replacement sheet.

[0016] In some possible implementations, based on the correspondence between the first coordinate system and the second coordinate system, the specific steps include: First, obtaining the first relative positional relationship between the coordinates of the reference mark and the mark position corresponding to the first reference mark on the flexible mask in the first coordinate system, and the second relative positional relationship between the coordinates of the alignment mark and the second reference mark in the second coordinate system; wherein the first relative positional relationship and the second relative positional relationship are the same; then, based on the first reference coordinates, the second reference coordinates, the first relative positional relationship and the second relative positional relationship, obtaining the first target coordinates of the first target position in the first coordinate system and the second target coordinates of the second target position in the second coordinate system.

[0017] When using the above technical solution, the reference mark on the flexible mask may not be the same mark as the corresponding first reference mark. Similarly, the alignment mark on the solar cell may not be the same mark as the second reference mark. Therefore, it is necessary to first obtain the first relative positional relationship between the coordinates of the reference mark and the first reference mark in the first coordinate system, and the second relative positional relationship between the coordinates of the alignment mark and the second reference mark in the second coordinate system. The first and second relative positional relationships are identical. Then, based on the determined first and second reference coordinates, the first target coordinates of the reference mark in the first coordinate system when performing alignment at the first target position can be obtained according to the first reference coordinates and the first relative positional relationship. Similarly, the second target coordinates of the alignment mark in the second coordinate system when performing alignment at the second target position can be obtained according to the second reference coordinates and the second relative positional relationship.

[0018] In some possible implementations, based on the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates in the first coordinate system and the second target coordinates in the second coordinate system are obtained, satisfying the following relationship:

[0019] The first target's location in the first coordinate system is (X...). A Y A );

[0020] The first reference coordinate is (X) A1 Y A1 );

[0021] The second target's location, in the second coordinate system, has coordinates (X...). B Y B );

[0022] The second reference coordinate is (X) B1 Y B1 );

[0023] When the laser scribing platform moves to any position, the coordinates of one of the reference marks in the first coordinate system are (X... A2 Y A2 ), where the coordinates of one of the first reference marks in the first coordinate system are (X A3 Y A3 );

[0024] Both the first and second relative positional relationships are (△X, △Y);

[0025] (△X, △Y)=(X A2 -X A3 Y A2 -Y A3 );

[0026] (X A Y A )=(X A1 -△X, Y A1 -△Y);

[0027] (X B Y B )=(X B1 -△X, Y B1 -△Y).

[0028] Using the above calculation formula, given the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates and the second target coordinates of the reference mark and the alignment mark when they are aligned can be calculated.

[0029] In some possible implementations, the coordinates of the first datum mark and the reference mark are the same in the first coordinate system, and the coordinates of the second datum mark and the alignment mark are the same in the second coordinate system;

[0030] The first target position and the first target coordinates in the first coordinate system are the first reference coordinates.

[0031] The second target's position and its coordinates in the second coordinate system are the second reference coordinates.

[0032] When employing the above technical solution, that is, when establishing the correspondence between the first coordinate system and the second coordinate system, the positions of the first reference mark used on the replacement sheet and the reference mark used for alignment on the flexible mask are consistent. Specifically, the first reference coordinate of the first reference mark on the replacement sheet at the alignment position is the same as the first target coordinate of the reference mark on the flexible mask at the first target position for alignment. Similarly, the alignment mark on the solar cell is consistent with the position of the second reference mark, and the second reference coordinate of the second reference mark on the solar cell at the alignment position is the same as the second target position of the alignment mark at the second target position for alignment. Thus, the calculation process for the reference mark and alignment mark during actual alignment can be eliminated, and alignment can be performed directly based on the first and second reference coordinates.

[0033] In some possible implementations, the laser scribing platform carrying the flexible mask is moved in a first coordinate system to move the reference mark to a first target position, and the battery cell is moved in a second coordinate system generated by an image recognition device. During the movement of the battery cell, the image recognition device identifies the position of the alignment mark and moves the alignment mark to a second target position. This includes: first, moving the battery cell in the second coordinate system generated by the image recognition device, during which the position of the alignment mark is identified by the image recognition device located below the battery cell and the alignment mark is moved to the second target position; then, moving the laser scribing platform carrying the flexible mask in the first coordinate system to move the reference mark to the first target position.

[0034] When employing the above technical solution, if the image recognition device is located below the laser scribing platform, to facilitate the image recognition device's identification of the alignment marks on the battery cell and to avoid the laser scribing platform obstructing the image recognition device, the battery cell is first moved so that the alignment marks are moved to the second target position. During this movement, the alignment marks are identified by the image recognition device. Then, the laser scribing platform is moved so that the reference mark is moved to the first target position for alignment with the second target position.

[0035] In some possible implementations, a laser scribing platform carrying a flexible mask is moved in a first coordinate system to move a reference mark to a first target position, and the battery cell is moved in a second coordinate system generated by an image recognition device. During the movement of the battery cell, the image recognition device identifies the position of a alignment mark and moves the alignment mark to a second target position. This includes: first, moving the laser scribing platform carrying the flexible mask in the first coordinate system to move the reference mark to the first target position; then, moving the battery cell in the second coordinate system generated by the image recognition device. During this process, the position of the alignment mark is identified by an image recognition device located below the battery cell, and the alignment mark is moved to the second target position.

[0036] When the above technical solution is adopted, if the image recognition device is located above the laser marking platform and is not obstructed by the laser marking platform, the laser marking platform can be moved first to move the reference mark to the first target position, and then the battery cell can be moved. The image recognition device can identify the alignment mark and move the alignment mark to the second target position.

[0037] In some possible implementations, the first target position and the second target position are the positions where the laser scribing platform is located when performing flexible mask laser scribing;

[0038] Alternatively, the first target location and the second target location can be the positions where the battery cell was picked up.

[0039] Alternatively, the first target position and the second target position can be any position between the position where the laser scribing platform is performing flexible mask laser scribing and the position where the battery cell is picked up.

[0040] With the above technical solution, the alignment position of the flexible mask and the solar cell can be located at the initial marking position of the laser marking platform. During alignment, the laser marking platform does not move horizontally, only the solar cell needs to move horizontally; or the alignment position can be located at the pick-up position of the solar cell. During alignment, the solar cell does not move horizontally, only the laser marking platform needs to move horizontally; or the alignment position can be located at any position between the laser marking position and the solar cell pick-up position. During alignment, both the laser marking platform and the solar cell need to move horizontally. The alignment position should be selected according to the actual situation.

[0041] In some possible implementations, moving the battery cell in the second coordinate system generated by the image recognition device includes moving the battery cell along the X-axis, Y-axis, and / or rotating it within the second coordinate system. Thus, based on the second target coordinates of at least two alignment marks at their alignment positions, the battery cell is moved by moving it along the X-axis, Y-axis, and / or rotating it within the second coordinate system, thereby aligning the multiple alignment marks with their corresponding second target coordinates.

[0042] In some possible implementations, the battery cells are moved by a robotic arm or guide rail.

[0043] In some possible implementations, the sheet is moved by a robotic arm or guide rail instead of a robotic arm.

[0044] In some possible implementations, the mask pattern is enclosed by laser scribing lines, and a reference mark is located within the boundary of the laser scribing lines that enclose the mask pattern.

[0045] Secondly, the present invention also provides an alignment system for a flexible mask and a solar cell, comprising:

[0046] A laser scribing platform is used to support a flexible mask, and the laser scribing platform can move in the first coordinate system where the supporting surface of the laser scribing platform is located;

[0047] The moving mechanism, located above the laser scribing platform, is used to move the battery cells and replacement sheets.

[0048] An image recognition device is located below the laser scribing platform. The image recognition device is used to generate a second coordinate system and identify the position of the alignment mark of the battery cell and the first reference mark of the replacement sheet in the second coordinate system.

[0049] A control device is used to control a laser scribing platform carrying a flexible mask to move in the first coordinate system based on the correspondence between the first and second coordinate systems, so that the reference mark moves to the first target position, and to control a moving mechanism to move the battery cell in the second coordinate system. During the movement of the battery cell, an image recognition device is controlled to identify the position of the alignment mark, so that the alignment mark moves to the second target position. The coordinates of the first target position and the second target position are consistent in the first and second coordinate systems, thus completing the alignment of the reference mark and the alignment mark. Afterwards, the moving mechanism is controlled to move the battery cell along the direction from the second target position to the first target position, so that the battery cell is attached to the flexible mask.

[0050] The alignment system for the flexible mask and the solar cell employs any of the alignment methods described above, and has the same beneficial effects as the alignment method, which will not be elaborated further here.

[0051] In some possible implementations, the moving mechanism includes a robotic arm or a guide rail, on which are provided picking components for picking up battery cells and replacement sheets.

[0052] In some possible implementations, the picking-up component is an adsorption mechanism or a clamping mechanism. Attached Figure Description

[0053] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0054] Figure 1 A schematic diagram of a flexible mask and battery cell alignment system provided in an embodiment of the present invention;

[0055] Figure 2 This is a schematic diagram of a reference mark on a flexible mask provided in an embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of a alignment mark on a battery cell provided in an embodiment of the present invention.

[0057] Reference numerals in the attached figures: 1 is the laser scribing platform, 2 is the flexible mask, 21 is the reference mark, 3 is the moving mechanism, 31 is the guide rail, 32 is the pickup component, 4 is the battery cell, 41 is the alignment mark, and 5 is the image recognition device. Detailed Implementation

[0058] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0059] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0061] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] In the fabrication of solar cells, patterned flexible masks are used to create patterned films, such as metal electrodes. Specifically, after the flexible mask is patterned, the solar cell is aligned with the mask pattern, and the mask is attached to the cell surface. Next, a metal layer is deposited on the patterned mask. Finally, the mask is removed to form the metal electrodes. The location of the patterned films on the solar cell is crucial. However, current technology uses image recognition devices to identify contrast marks on both the solar cell and the flexible mask, then uses these marks to align the cell with the mask. This current alignment method requires the combined error of the two image recognition steps to achieve the correct positioning accuracy. If the accuracy of the two steps is ±50μm and ±30μm respectively, the final alignment deviation is ±80μm, which fails to meet the accuracy requirements for the alignment of the flexible mask and the solar cell.

[0064] It should be noted that the solar cell can be a semiconductor substrate, which refers to a semiconductor substrate, or a structure having a semiconductor substrate and other functional layers. Flexible masks can be applied to the deposition of various functional layers and / or metal electrodes on the solar cell.

[0065] In view of this, such as Figures 1-3 As shown, this embodiment of the invention provides a method for aligning a flexible mask with a solar cell, comprising the following steps:

[0066] Step S100: A battery cell 4 is provided, having at least two alignment marks 41. For example, there may be two, three, four, or more alignment marks 41; typically, two are sufficient to satisfy the alignment coordinates and orientation requirements of the battery cell 4. The shape of the alignment marks 41 may be dot-shaped, cross-shaped, etc., as long as the coordinates and orientation of the alignment marks 41 can be accurately determined and identified, and is not limited to the shapes listed in this embodiment.

[0067] In step S200, the flexible mask 2 is placed on the laser scribing platform 1. Based on the first coordinate system where the laser scribing platform 1 is located, at least two reference marks 21 are scribed on the flexible mask 2 using a laser, and the flexible mask 2 is patterned to form a mask pattern. The reference marks 21 are used to align with the alignment marks 41.

[0068] It should be noted that the marking accuracy and the movement and positioning accuracy of the laser marking platform 1 can reach 1 to 2 μm. The first coordinate system, which is the coordinate system used by the laser marking platform 1 when moving and laser marking, is the coordinate system built into the laser marking platform 1.

[0069] In this design, the number of reference marks 21 on the flexible mask 2 is equal to and corresponds one-to-one with the number of alignment marks 41 on the battery cell 4. The relative positions between each reference mark 21 are the same as the relative positions between each alignment mark 41. The shape of the reference mark 41 is the same as the shape of the alignment mark 21, which can improve the recognition and alignment accuracy. Of course, the shapes can also be different, as long as they can be recognized and aligned. The mask pattern can be a pattern formed by laser scribing lines on the flexible mask 2, where the laser scribing lines are the boundary lines of the mask pattern. Alternatively, the mask pattern can be the laser scribing lines themselves on the flexible mask 2, in which case the line width of the laser scribing lines is the cutout width of the mask pattern.

[0070] In step S300, based on the correspondence between the first coordinate system and the second coordinate system, the laser scribing platform 1 carrying the flexible mask 2 is moved in the first coordinate system, so that the reference mark 21 is moved to the first target position. The battery cell 4 is moved in the second coordinate system generated by the image recognition device 5. During the movement of the battery cell 4, the image recognition device 5 identifies the position of the alignment mark 41 and moves the alignment mark 41 to the second target position. The coordinates of the first target position and the second target position are consistent in the first coordinate system and the second coordinate system, thus completing the alignment of the reference mark 21 and the alignment mark 41.

[0071] It should be noted that the positioning accuracy of the image recognition device 5 is ±50μm. The reference mark 21 moves to the first target position for alignment, and the alignment mark 41 moves to the second target position for alignment. The coordinates of the first target position and the second target position are the same in the first coordinate system, or the coordinates of the first target position and the second target position are the same in the second coordinate system. For example, if both the first coordinate system and the second coordinate system are two-dimensional coordinate systems parallel to the horizontal plane, then the first target position and the second target position are at the same coordinate position in the horizontal direction, only their positions in the height direction are different.

[0072] In step S400, the battery cell 4 is moved along the direction from the second target position to the first target position, so that it adheres to the flexible mask 2. Because the flexible mask 2 has a polymer film layer, it has good flexibility and cannot be easily removed. To reduce the stretching and deformation of the flexible mask 2, which would affect the accuracy of the reference mark 21 and the mask pattern, the flexible mask 2 needs to be placed on the laser scribing platform 1. The scribing of the flexible mask 2 and the adhesion of the battery cell 4 to the flexible mask 2 are both performed on the laser scribing platform 1. Only after the alignment and adhesion of the flexible mask 2 and the battery cell 4 are completed can the flexible mask 2 and the battery cell 4 be removed together from the laser scribing platform 1. The adhesion of the battery cell 4 to the flexible mask 2 can be achieved by bonding the battery cell 4 to the polymer film layer of the flexible mask 2, or by applying adhesive to the polymer film layer and then adhering the battery cell 4 to the adhesive-coated flexible mask 2.

[0073] Using the above technical solution, the flexible mask 2 is marked with reference marks 21 and patterned using a laser marking platform 1 to form a mask pattern. Because the laser marking platform 1 has higher positioning accuracy, the positional accuracy of the reference marks 21 and the mask pattern can reach approximately 1 μm. Furthermore, the laser marking platform 1, which carries the flexible mask 2, is moved within the first coordinate system, causing the reference marks 21 to move to the first target position for alignment. Due to the higher positioning accuracy of the laser marking platform 1 itself and the higher accuracy of the first coordinate system, the positional accuracy of the first target position is further improved, enhancing the positional accuracy of the flexible mask 2 at the alignment position. The positional accuracy can reach approximately 1 μm. This is because the image recognition device 5 aligns the battery cell 4... Mark 41 is identified, and the alignment mark 41 is moved to the second target position in the second coordinate system generated by the image recognition device 5. The positioning accuracy of the image recognition device 5 itself and the positioning accuracy of the second coordinate system are within ±50μm. Combining the positioning accuracy of the laser scribing platform 1 and the image recognition device 5, the final alignment accuracy between the flexible mask 2 and the solar cell 4 can be improved to 51μm. Compared with the existing two-step image recognition and alignment after marking the mask and the solar cell, this application utilizes the high precision of the laser scribing platform 1 itself, eliminating the need for image recognition and positioning of the flexible mask 2. The solar cell 4 is identified and positioned only once by the image recognition device 5, which improves the final alignment accuracy between the flexible mask 2 and the solar cell 4 and meets the alignment and bonding accuracy requirements of the solar cell and the flexible mask 2.

[0074] The alignment method is applicable to solar cells such as back-contact solar cells, PERC (Passivated Emitter Rear Cell), TOPCon (Tunnel Oxide Passivated Contact Solar) cells, or heterojunction solar cells. Specifically, back-contact cells can be IBC (Interdigitated Back Contact) cells, TBC cells (TOPCon-based back-contact cells), HBC cells (heterojunction back-contact cells), etc. Since back-contact solar cells have pn regions, the electrodes on the cell need to be aligned with the pn region pattern. This requires higher alignment and bonding precision between the flexible mask 2 and the solar cell 4. The alignment method in this invention can meet the alignment and bonding precision requirements of this type of solar cell and the flexible mask 2.

[0075] In some embodiments, the correspondence between the first coordinate system and the second coordinate system mentioned in step S300 can be established only once after the laser marking platform 1 and the image recognition device 5 are in place. Subsequently, each alignment of the flexible mask 2 and the battery cell 4 can be performed using the correspondence between the first and second coordinate systems established initially. Alternatively, the first and second coordinate systems can be established once before each alignment of the flexible mask 2 and the battery cell 4. The process of establishing the correspondence between the first and second coordinate systems includes the following steps:

[0076] Step S311: First, place the replacement sheet on the laser scribing platform 1. The replacement sheet can be a sheet with a certain supporting strength, with a size similar to that of the battery cell 4, and the material is not limited. Alternatively, a flexible mask can be used as the replacement sheet.

[0077] Step S312: Based on the first coordinate system where the laser scribing platform 1 is located, at least two first reference marks are scribed on the alternative sheet using a laser. The positions of the first reference marks can correspond one-to-one with the positions of the reference marks 21. The first reference marks are used to align with the second reference marks on the battery cell 4.

[0078] For example, the number of first reference marks can be two, three, four, or more. The scribing and positional accuracy of the first reference marks is based on the accuracy of the laser scribing platform 1, and can reach approximately 1 μm. The relative positions between each first reference mark are the same as the relative positions of each reference mark 21 on the flexible mask 2 that is subsequently aligned, and the first reference marks and reference marks 21 can correspond one-to-one. Second reference marks can be set on the solar cell 4, and the second reference marks correspond one-to-one with the alignment marks 41 on the solar cell 4. Accordingly, the first reference marks are used for alignment with the second reference marks.

[0079] Step S313: Move the laser scribing platform 1 carrying the replacement sheet to the alignment position, so that the first reference mark moves to the first reference coordinate in the first coordinate system. That is, when the replacement sheet moves to a certain alignment position, the coordinates of the first reference mark on the replacement sheet in the first coordinate system are the first reference coordinates.

[0080] Step S314: The image recognition device 5 identifies the first reference mark and obtains the second reference coordinates of the first reference mark in the second coordinate system. The second reference coordinates are used as the coordinates of the second reference mark when it is in the alignment position in the second coordinate system. That is, the coordinates of the second reference mark when it is in the alignment position in the second coordinate system are determined. By replacing the same first reference mark on the thin sheet, the coordinates of the first reference mark in the first coordinate system and the coordinates in the second coordinate system when it is in the alignment position are determined at the same time, and the correspondence between the first coordinate system and the second coordinate system is established.

[0081] Using the above technical solution, leveraging the high positioning accuracy of the laser marking platform 1 and the high accuracy of the first coordinate system, the first reference coordinates of the first reference mark at its alignment position in the first coordinate system are first determined. Based on the high positioning accuracy at the alignment position of the first reference mark, the image recognition device 5 identifies and obtains the second reference coordinates of the first reference mark in the second coordinate system generated by the image recognition device 5. A correspondence between the first and second coordinate systems is established using the same first reference mark. Subsequently, the first reference coordinates in the first coordinate system can be used as a reference for the coordinates of the reference mark 21 on the flexible mask 2 in the first coordinate system, and the second reference coordinates in the second coordinate system can be used as a reference for the coordinates of the alignment mark 41 in the second coordinate system. It is evident that the establishment of the correspondence between the first and second coordinate systems is based on the high positioning accuracy of the laser marking platform 1, making the correspondence between the first and second coordinate systems more precise, thereby improving the alignment accuracy.

[0082] Furthermore, in some embodiments, the step S313 of identifying the first reference marker located at the first reference coordinate by the image recognition device 5 specifically includes the following steps:

[0083] Step S3131: The replacement sheet is translated away from the laser marking platform 1 along a direction perpendicular to the bearing surface of the laser marking platform 1. For example, if the bearing surface of the laser marking platform 1 is horizontal, the replacement sheet is translated upward in the vertical direction to keep the replacement sheet in a horizontal state. Specifically, the replacement sheet can be grasped and moved by a robotic arm to detach it from the support of the laser marking platform 1.

[0084] Step S3132: Move the laser marking platform 1 away along a direction parallel to the bearing surface of the laser marking platform 1. For example, if the bearing surface is horizontal and the moving direction of the laser marking platform 1 is horizontal, after the replacement sheet is raised, move the laser marking platform 1 horizontally away so that the laser marking platform 1 is no longer directly below the replacement sheet, and the two are offset in the horizontal direction.

[0085] In step S3133, the first reference mark is identified from below the substitute sheet by the image recognition device 5 located below the laser marking platform 1. After the laser marking platform 1 is removed, the image recognition device 5 located below the laser marking platform 1 can be moved to directly below the substitute sheet. At this time, the laser marking platform 1 no longer obstructs the image recognition device 5, and the image recognition device 5 can more accurately identify the first reference mark on the substitute sheet.

[0086] In the case of the above technical solution, in order to facilitate the arrangement of the image recognition device 5, the laser scribing platform 1, and the moving mechanism 3 for moving the battery cell 4 and the replacement sheet, and to facilitate the recognition of the battery cell 4 and the replacement sheet by the image recognition device 5, the image recognition device 5 is placed below the laser scribing platform 1, and the moving mechanism 3 for moving the battery cell 4 and the replacement sheet is placed above the laser scribing platform 1. The image recognition device 5 can recognize the alignment mark 41 of the battery cell 4 and the first reference mark of the replacement sheet from directly below. The position of the image recognition device 5 will not interfere with the horizontal movement of the battery cell 4. Therefore, based on this arrangement, when establishing the alignment reference by using a replacement sheet, since the replacement sheet is placed on the laser marking platform 1, the image recognition device 5 located below the laser marking platform 1 will be obstructed by the laser marking platform 1 when recognizing the first reference mark on the replacement sheet. Therefore, it is necessary to move the replacement sheet upward away from the laser marking platform 1 without changing the horizontal position of the replacement sheet, and move the laser marking platform 1 away in the horizontal direction so that there is no obstruction between the image recognition device 5 and the replacement sheet, which facilitates recognition.

[0087] Of course, if the distance between the laser marking platform 1 and the moving mechanism 3 is sufficient, the image recognition device 5 can be moved horizontally between the laser marking platform 1 and the moving mechanism 3. In this way, after placing the substitute sheet on the laser marking platform 1 and moving the laser marking platform 1 to move the first reference mark of the substitute sheet to the first reference coordinate at the alignment position, the image recognition device can directly recognize the first reference mark above the substitute sheet to obtain the second reference coordinate of the first reference mark in the second coordinate system, without needing to use the moving mechanism 3 to lift the substitute sheet off the laser marking platform 1.

[0088] In some possible implementations, the shape of the first reference mark is the same as that of both the reference mark 21 and the alignment mark 41. This arrangement allows for more accurate identification and alignment of marks with the same shape.

[0089] In this embodiment, when the image recognition device 5 identifies the first reference mark from below, the replacement sheet is a transparent sheet, and the first reference mark is disposed through the thickness direction of the replacement sheet or on the surface of the replacement sheet away from the laser scribing platform 1. Thus, since the replacement sheet is transparent, the first reference mark can be recognized by the image recognition device 5 below and simultaneously aligned with the battery cell 4 above. Alternatively, the replacement sheet can be non-transparent, and the first reference mark can be disposed through the thickness direction of the replacement sheet. In this configuration, the image recognition device 5 can identify the first reference mark from below the replacement sheet.

[0090] In some embodiments, step S300, based on the correspondence between the first coordinate system and the second coordinate system, specifically includes the following steps:

[0091] Step S321: Obtain the first relative positional relationship between the reference mark 21 and the mark position corresponding to the first reference mark on the flexible mask 2 in the first coordinate system, and obtain the second relative positional relationship between the alignment mark 41 and the second reference mark in the second coordinate system; wherein, the first relative positional relationship and the second relative positional relationship are the same.

[0092] Step S322: Based on the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, obtain the first target coordinates in the first coordinate system and the second target coordinates in the second coordinate system.

[0093] When using the above technical solution, the reference mark 21 on the same flexible mask 2 may not be the same mark as the mark position of the corresponding first reference mark. Correspondingly, the alignment mark 41 on the battery cell 4 may not be the same mark as the second reference mark. Therefore, it is necessary to first obtain the first relative positional relationship between the coordinates of the reference mark 21 and the first reference mark in the first coordinate system, and the second relative positional relationship between the coordinates of the alignment mark and the second reference mark in the second coordinate system. The first relative positional relationship and the second relative positional relationship are the same. Subsequently, since the first and second reference coordinates have already been determined during the alignment process of the first and second coordinate systems (i.e., in steps S313 and S314), based on this, the first target coordinates of the reference mark 21 in the first coordinate system when it is located at the first target position for alignment can be obtained according to the first reference coordinates and the obtained first relative position relationship. This determines the first target coordinates of the first target position in the first coordinate system. Similarly, the second target coordinates of the alignment mark 41 in the second coordinate system when it is located at the second target position for alignment can be obtained according to the second reference coordinates and the obtained second relative position relationship. This determines the second target coordinates of the second target position in the second coordinate system. Then, the laser scribing platform 1 is moved to move the reference mark 21 on the flexible mask 2 to the determined first target coordinates in the first coordinate system, and the battery cell 4 is moved to move the alignment mark 41 on the battery cell 4 to the determined second target coordinates in the second coordinate system. Finally, the battery cell 4 can be attached to the flexible mask 2.

[0094] For example, based on the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates in the first coordinate system and the second target coordinates in the second coordinate system are obtained, satisfying the following relationship:

[0095] The parameters are set as follows:

[0096] The first target's location in the first coordinate system is (X...). A Y A );

[0097] The first reference coordinate is (X) A1 Y A1 );

[0098] The second target's location, in the second coordinate system, has coordinates (X...). B Y B );

[0099] The second reference coordinate is (X) B1 Y B1 );

[0100] When the laser marking platform 1 moves to any position, the coordinates of one of the reference marks 21 in the first coordinate system are (X... A2 Y A2 ), where the coordinates of one of the first reference marks in the first coordinate system are (X A3 Y A3 );

[0101] When the battery cell 4 moves to any position, the coordinates of one of the alignment marks 41 in the second coordinate system are (X... B2 Y B2 ), where the coordinates of one of the second reference marks in the second coordinate system are (X B3 Y B3 );

[0102] Both the first and second relative positional relationships are (△X, △Y);

[0103] Therefore, the above parameters satisfy the following calculation formula:

[0104] (△X, △Y)=(X A2 -X A3 Y A2 -Y A3 )=(X B2 -X B3 Y B2 -Y B3 );

[0105] (X A Y A )=(X A1 -△X, Y A1 -△Y)=(X A1 -(X A2 -XA3 ), Y A1 -(Y A2 -Y A3 ));

[0106] (X B Y B )=(X B1 -△X, Y B1 -△Y)=(X B1 -(X B2 -X B3 ), Y B1 -(Y B2 -Y B3 )).

[0107] Using the above calculation formula, given the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates and the second target coordinates of the reference mark 21 and the alignment mark 41 during alignment can be calculated. This allows the first reference mark used when establishing the correspondence between the first and second coordinate systems to be different from the reference mark 21 used when actually aligning the flexible mask 2 and the battery cell 4. Therefore, when actually aligning the flexible mask 2 and the battery cell 4, any mark position on the flexible mask 2 can be selected as the reference mark 21, as long as the first relative position relationship between the reference mark 21 and the first reference mark is determined beforehand. Similarly, when actually aligning the flexible mask 2 and the battery cell 4, any mark position on the battery cell 4 can be selected as the alignment mark 41, as long as the second relative position relationship between the alignment mark 41 and the second reference mark is determined beforehand, reducing the constraints on the alignment operation.

[0108] Of course, in other embodiments, the coordinates of the first reference mark and the reference mark 21 are the same in the first coordinate system, and the coordinates of the second reference mark and the alignment mark 41 are the same in the second coordinate system; the first target coordinates of the first target position in the first coordinate system are the first reference coordinates; the second target coordinates of the second target position in the second coordinate system are the second reference coordinates. That is, both the first relative position relationship and the second relative position relationship are (0, 0).

[0109] Thus, when establishing the correspondence between the first and second coordinate systems, the positions of the first reference mark used on the replacement sheet and the reference mark 21 used for alignment on the flexible mask 2 are consistent. That is, the first reference coordinate of the first reference mark on the replacement sheet at the alignment position is the same as the first target coordinate of the reference mark 21 on the flexible mask 2 at the first target position for alignment. Similarly, the positions of the alignment mark 41 on the battery cell 4 and the second reference mark are consistent. The second reference coordinate of the second reference mark on the battery cell 4 at the alignment position is the same as the second target position of the alignment mark 41 at the second target position for alignment. In this way, the calculation process of the relative positional relationship between the reference mark 21 and the alignment mark 41 during actual alignment can be eliminated, and alignment can be performed directly based on the first and second reference coordinates, further simplifying the alignment operation.

[0110] In this embodiment, in step S300, the laser scribing platform 1 carrying the flexible mask 2 is moved in the first coordinate system, causing the reference mark 21 to move to the first target position. The battery cell 4 is then moved in the second coordinate system generated by the image recognition device 5. During the movement of the battery cell 4, the image recognition device 5 identifies the position of the alignment mark 41 and moves it to the second target position. There are two movement methods, the first of which includes the following steps:

[0111] First, the battery cell 4 is moved in the second coordinate system generated by the image recognition device 5. During this process, the position of the alignment mark 41 is identified by the image recognition device 5 located below the battery cell 4, so that the alignment mark 41 is moved to the second target position.

[0112] Then, the laser scribing platform 1 carrying the flexible mask 2 is moved in the first coordinate system so that the reference mark 21 is moved to the first target position.

[0113] The reason for adopting the first moving method is that, when the image recognition device 5 is located below the laser marking platform 1, in order to facilitate the image recognition device 5 in recognizing the alignment mark 41 on the battery cell 4 and avoid the laser marking platform 1 obstructing the image recognition device 5, the battery cell 4 is moved first, so that the alignment mark 41 is moved to the second target position. During the movement, the alignment mark 41 is recognized by the image recognition device 5. Afterwards, the laser marking platform 1 is moved, so that the reference mark 21 is moved to the first target position for alignment with the second target position.

[0114] The second method of movement includes the following steps:

[0115] First, move the laser scribing platform 1 carrying the flexible mask 2 in the first coordinate system so that the reference mark 21 moves to the first target position;

[0116] Then, the battery cell 4 is moved in the second coordinate system generated by the image recognition device 5. During this process, the position of the alignment mark 41 is identified by the image recognition device 5 located below the battery cell 4, so that the alignment mark 41 is moved to the second target position.

[0117] The reason for adopting the second moving method is that, when the image recognition device 5 is located above the laser marking platform 1 and is not obstructed by the laser marking platform 1, the laser marking platform 1 can be moved first to move the reference mark 21 to the first target position, and then the battery cell 4 can be moved. The image recognition device 5 can then identify the alignment mark 41 and move the alignment mark 41 to the second target position. Of course, when the image recognition device 5 is located above the laser marking platform 1 and is not obstructed by the laser marking platform 1, the battery cell 4 can also be moved to the second target position first, and then the laser marking platform 1 can be moved to the first target position.

[0118] In some embodiments, the first target position and the second target position are the positions where the laser marking platform 1 is located when it performs laser marking on the flexible mask 2; or the first target position and the second target position are the positions where the battery cell 4 is picked up; or the first target position and the second target position are any positions between the positions where the laser marking platform 1 is located when it performs laser marking on the flexible mask 2 and the positions where the battery cell 4 is picked up.

[0119] With the above technical solution, the alignment position of the flexible mask 2 and the battery cell 4 can be located at the initial marking position of the laser marking platform 1. After the flexible mask 2 completes the marking of the reference mark 21 and the mask pattern, the laser marking platform 1 does not need to move horizontally. At this time, the reference mark 21 of the flexible mask 2 on the laser marking platform 1 is at the first target position for alignment. The battery cell 4 only needs to move horizontally to one side of the laser marking platform 1 to move the alignment mark 41 to the second target position. Alternatively, the alignment position can be located at the pick-up position of the battery cell 4. After the flexible mask 2 completes the marking, the battery cell 4 is picked up, and the alignment mark 41 on the battery cell 4 is already at the second target position for alignment. Therefore, the battery cell 4 does not need to move horizontally. The laser marking platform 1 only needs to move horizontally to the side closer to the battery cell 4 to move the reference mark 21 of the flexible mask 2 to the first target position. Alternatively, the alignment position can be located anywhere between the laser marking position and the battery cell 4 pickup position. During alignment, both the laser marking platform 1 and the battery cell 4 need to move horizontally. The alignment position is selected based on the actual situation. Since the battery cell 4 does not move horizontally when the first and second target positions are the positions when it is picked up, only the more precise laser marking platform moves. Therefore, compared to the other two position settings, the alignment accuracy of the flexible mask 2 and the battery cell 4 is further improved.

[0120] In this embodiment, moving the battery cell 4 in the second coordinate system generated by the image recognition device 5 includes moving the battery cell 4 along the X-axis, moving it along the Y-axis, and / or rotating it within the second coordinate system generated by the image recognition device 5. Thus, based on the second target coordinates of at least two alignment marks 41 at their alignment positions, moving the battery cell 4 adjusts the coordinates and orientations of the multiple alignment marks 41 in the second coordinate system through X-axis movement, Y-axis movement, and / or rotational movement, thereby aligning the multiple alignment marks 41 with their corresponding second target coordinates.

[0121] In some embodiments, the battery cell 4 and the replacement sheet are moved by a robotic arm or a guide rail. The robotic arm and guide rail have high positioning accuracy, which can meet the alignment accuracy requirements. Any method that can achieve the movement of the battery cell 4 and the replacement sheet is acceptable and is not limited to the methods listed in this embodiment.

[0122] In some embodiments, the mask pattern is enclosed by laser scribing lines, and the reference mark 21 is located within the boundary of the laser scribing lines enclosing the mask pattern. When using a laser to scribing the reference mark 21 on the flexible mask 2 and to form a mask pattern, if the mask pattern is enclosed by laser scribing lines, the reference mark 21 is scribed within the boundary of the laser scribing lines. This ensures that during alignment, the portion of the flexible mask 2 located within the boundary of the laser scribing lines remains, and the reference mark 21 is also retained. After moving the reference mark 21 to the first target position, the portion located within the boundary of the laser scribing lines needs to be torn off. At this time, the reference mark is removed along with the torn portion, and the flexible mask 2 no longer has the reference mark 21. This avoids the deposition of other materials at the location of the reference mark 21 on the battery cell 4, which should not be deposited, thus affecting battery performance. Of course, the reference mark 21 can also be scribed outside the boundary of the laser scribing lines enclosing the mask pattern and located in the non-deposition area of ​​the flexible mask 2. Although the reference mark 21 remains on the flexible mask 2, it will not deposit material in the working area of ​​the battery cell 4.

[0123] like Figures 1-3As shown, based on the alignment method described in any of the above embodiments, this embodiment of the invention also provides an alignment system for a flexible mask and a battery cell, which includes a laser scribing platform 1, a moving mechanism 3, an image recognition device 5, and a control device; wherein, the laser scribing platform 1 is used to carry the flexible mask 2, and the laser scribing platform 1 is movable in a first coordinate system in which the bearing surface of the laser scribing platform 1 is located; the moving mechanism 3 is located above the laser scribing platform 1, and the moving mechanism 3 is used to move the battery cell 4 and the replacement sheet; the image recognition device 5 is located below the laser scribing platform 1, and the image recognition device 5 is used to generate a second coordinate system and identify the positions of the alignment mark 41 of the battery cell 4 and the first reference mark of the replacement sheet in the second coordinate system; the control device is used to align the battery cell 4 and the replacement sheet based on the first coordinate system. The correspondence between the reference mark 21 and the second coordinate system is established. The laser scribing platform 1 carrying the flexible mask 2 is controlled to move in the first coordinate system, so that the reference mark 21 moves to the first target position. The moving mechanism 3 is controlled to move the battery cell 4 in the second coordinate system. During the movement of the battery cell 4, the image recognition device 5 is controlled to identify the position of the alignment mark 41 and provides real-time feedback to the control device. The moving mechanism 3 is then controlled to move so that the alignment mark 41 moves to the second target position. The coordinates of the first target position and the second target position are consistent in the first and second coordinate systems, thus completing the alignment of the reference mark 21 and the alignment mark 41. After that, the moving mechanism 3 is controlled to move the battery cell 4 in the direction from the second target position to the first target position, so that the battery cell 4 is attached to the flexible mask 2.

[0124] The alignment system for the flexible mask and the solar cell adopts any of the alignment methods described above. The alignment process can be referred to the above description of the alignment methods, and will not be repeated here.

[0125] The flexible mask 2 is marked with reference marks 21 and patterned using a laser marking platform 1 to form a mask pattern. Due to the higher positioning accuracy of the laser marking platform 1, the positional accuracy of the reference marks 21 and the mask pattern can reach about 1 μm. Furthermore, the laser marking platform 1, which carries the flexible mask, is moved within the first coordinate system to move the reference marks 21 to the first target position for alignment. Because the positioning accuracy of the laser marking platform 1 and the accuracy of the first coordinate system are both higher, the positional accuracy of the first target position is also higher, thus improving the positional accuracy of the flexible mask 2 when it is moved to the alignment position. The positional accuracy can reach about 1 μm. Since the image recognition device 5 identifies the alignment mark 41 on the solar cell 4 and moves the alignment mark 41 to the second target position in the second coordinate system generated by the image recognition device 5, the positioning accuracy of the image recognition device 5 itself and the positioning accuracy of the second coordinate system are within ±50μm. Combining the positioning accuracy of the laser scribing platform 1 and the image recognition device 5, the final alignment accuracy between the flexible mask 2 and the solar cell 4 can be improved to 51μm. Compared with the existing two-step image recognition and alignment after identifying the marks on the mask and the solar cell, this application utilizes the high precision of the laser scribing platform 1 itself, eliminates the image recognition and positioning of the flexible mask 2, and only uses the image recognition device 5 to identify and position the solar cell 4 once, thereby improving the final alignment accuracy between the flexible mask 2 and the solar cell 4 and meeting the alignment and bonding accuracy requirements of the solar cell and the flexible mask 2.

[0126] In some embodiments, the moving mechanism 3 includes a robotic arm or guide rail 31, with a pickup component 32 on the robotic arm and guide rail 31 for picking up the battery cell 4 and the replacement sheet. During operation, the control device controls the robotic arm or guide rail 31 to move to the pickup position of the battery cell 4, and the pickup component 32 picks up the battery cell 4. Based on the coordinates of the alignment mark 41 on the battery cell 4 identified by the image recognition device 5 in the second coordinate system, the control device controls the robotic arm or guide rail 32 to move to the second target position for alignment. Additionally, the robotic arm or guide rail 32 can also lift the replacement sheet vertically away from the laser scribing platform 1. The robotic arm offers greater flexibility and a wider range of motion; the guide rail 32 provides higher positioning accuracy. A suitable moving mechanism 3 can be selected based on space and accuracy requirements.

[0127] Furthermore, in this embodiment, the pickup component 32 is an adsorption mechanism or a clamping mechanism. The adsorption mechanism may include a negative pressure suction cup, which adsorbs the surface of the battery cell 4, while the clamping mechanism can clamp the periphery of the battery cell 4. The appropriate pickup component 32 can be selected according to actual needs and is not limited to the solutions listed in this embodiment.

[0128] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0129] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for aligning a flexible mask with a solar cell, characterized in that, include: A battery cell is provided, the battery cell having at least two alignment marks; A flexible mask is placed on a laser scribing platform. Based on the first coordinate system in which the laser scribing platform is located, at least two reference marks are scribed on the flexible mask using a laser, and the flexible mask is patterned to form a mask pattern. The reference marks are used to align with the alignment marks. Based on the correspondence between the first coordinate system and the second coordinate system, the laser scribing platform carrying the flexible mask is moved in the first coordinate system to move the reference mark to the first target position. The battery cell is moved in the second coordinate system generated by the image recognition device. During the movement of the battery cell, the image recognition device identifies the position of the alignment mark and moves the alignment mark to the second target position. The coordinates of the first target position and the second target position are consistent in the first coordinate system and the second coordinate system, thus completing the alignment of the reference mark and the alignment mark. Move the battery cell along the direction from the second target position to the first target position so that the battery cell is attached to the flexible mask; The process of establishing the correspondence between the first coordinate system and the second coordinate system includes: The replacement sheet is placed on the laser scribing platform; Based on the first coordinate system in which the laser scribing platform is located, at least two first reference marks are scribed on the alternative sheet using a laser. The positions of the first reference marks correspond one-to-one with the positions of the reference marks. The first reference marks are used to align with the second reference marks on the battery cell. Move the laser scribing platform carrying the replacement sheet to the alignment position, so that the first reference mark moves to the first reference coordinate in the first coordinate system; The image recognition device identifies the first reference mark and obtains the second reference coordinates of the first reference mark in the second coordinate system. The second reference coordinates are used as the coordinates of the second reference mark when it is located at the alignment position in the second coordinate system, thus completing the establishment of the correspondence between the first coordinate system and the second coordinate system.

2. The alignment method according to claim 1, characterized in that, The process of identifying the first reference mark using the image recognition device includes: The replacement sheet is translated away from the laser scribing platform along a direction perpendicular to the bearing surface of the laser scribing platform; Move the laser marking platform away along a direction parallel to the bearing surface of the laser marking platform; The first reference mark is identified from below the alternative sheet by the image recognition device located below the laser scribing platform.

3. The alignment method according to claim 1 or 2, characterized in that, The shape of the first reference mark is the same as the shape of the reference mark and the alignment mark.

4. The alignment method according to claim 1 or 2, characterized in that, The replacement sheet is a transparent sheet, and the first reference mark is disposed through the thickness direction of the replacement sheet or disposed on the surface of the replacement sheet away from the laser scribing platform. Alternatively, the replacement sheet may be a non-transparent sheet, and the first reference mark may be disposed through the thickness direction of the replacement sheet.

5. The alignment method according to claim 1, characterized in that, The correspondence between the first coordinate system and the second coordinate system specifically includes: Obtain a first relative positional relationship between the reference mark and the mark position on the flexible mask corresponding to the first reference mark in the first coordinate system, and a second relative positional relationship between the alignment mark and the second reference mark in the second coordinate system; wherein, the first relative positional relationship and the second relative positional relationship are the same; Based on the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates in the first coordinate system and the second target coordinates in the second coordinate system are obtained.

6. The alignment method according to claim 5, characterized in that, Based on the first reference coordinates, the second reference coordinates, the first relative position relationship, and the second relative position relationship, the first target coordinates in the first coordinate system and the second target coordinates in the second coordinate system are obtained, satisfying the following relationship: The first target's position in the first coordinate system is (X... A Y A ); The first reference coordinate is (X A1 Y A1 ); The second target's position in the second coordinate system is (X... B Y B ); The second reference coordinate is (X) B1 Y B1 ) When the laser marking platform moves to any position, the coordinates of one of the reference marks in the first coordinate system are (X... A2 Y A2 ), where the coordinates of the first reference mark in the first coordinate system are (X A3 Y A3 ); Both the first relative positional relationship and the second relative positional relationship are (△X, △Y); (△X, △Y)=(X A2 - X A3 ,AND A2 - AND A3 ); (X A ,AND A )=(X A1 -△X,Y A1 -△Y); (X B ,AND B )=(X B1 -△X,Y B1 -△Y)。 7. The alignment method according to claim 1, 2, 5 or 6, characterized in that, The first reference mark and the reference mark have the same coordinates in the first coordinate system, and the second reference mark and the alignment mark have the same coordinates in the second coordinate system; The first target coordinates in the first coordinate system are the first reference coordinates; The second target position in the second coordinate system is the second target coordinate, which is the second reference coordinate.

8. The alignment method according to claim 1, characterized in that, The step of moving the laser scribing platform carrying the flexible mask in the first coordinate system to move the reference mark to the first target position, and moving the battery cell in the second coordinate system generated by the image recognition device, wherein during the movement of the battery cell, the image recognition device identifies the position of the alignment mark and moves the alignment mark to the second target position, includes: First, the battery cell is moved in the second coordinate system generated by the image recognition device. During this process, the position of the alignment mark is identified by the image recognition device located below the battery cell, so that the alignment mark is moved to the second target position. Then, the laser scribing platform carrying the flexible mask is moved in the first coordinate system, so that the reference mark is moved to the first target position.

9. The alignment method according to claim 1, characterized in that, The step of moving the laser scribing platform carrying the flexible mask in the first coordinate system to move the reference mark to the first target position, and moving the battery cell in the second coordinate system generated by the image recognition device, wherein during the movement of the battery cell, the image recognition device identifies the position of the alignment mark and moves the alignment mark to the second target position, includes: First, the laser scribing platform carrying the flexible mask is moved in the first coordinate system, so that the reference mark is moved to the first target position; Then, the battery cell is moved in the second coordinate system generated by the image recognition device. During this process, the position of the alignment mark is identified by the image recognition device located below the battery cell, and the alignment mark is moved to the second target position.

10. The alignment method according to claim 1, 8, or 9, characterized in that, The first target position and the second target position are the positions where the laser scribing platform is located when performing laser scribing on the flexible mask; Alternatively, the first target location and the second target location may be the location where the battery cell was picked up; Alternatively, the first target position and the second target position can be any position between the position where the laser scribing platform is performing laser scribing on the flexible mask and the position where the battery cell is picked up.

11. The alignment method according to claim 1, 8, or 9, characterized in that, Moving the battery cell in the second coordinate system generated by the image recognition device includes moving the battery cell along the X-axis, moving it along the Y-axis, and / or rotating it within the second coordinate system generated by the image recognition device.

12. The alignment method according to claim 1, characterized in that, The battery cells are moved by a robotic arm or guide rail.

13. The alignment method according to claim 1 or 2, characterized in that, The replacement sheet is moved by a robotic arm or guide rail.

14. The alignment method according to claim 1, characterized in that, The mask pattern is surrounded by laser-etched lines, and the reference mark is located within the boundary of the laser-etched lines that surround the mask pattern.

15. A flexible mask and solar cell alignment system, based on the alignment method according to any one of claims 1-14, characterized in that, include: A laser scribing platform is used to support a flexible mask, and the laser scribing platform is movable in a first coordinate system in which the supporting surface of the laser scribing platform is located; A moving mechanism, located above the laser scribing platform, is used to move the battery cell and the replacement sheet; An image recognition device is located below the laser scribing platform. The image recognition device is used to generate a second coordinate system and identify the positions of the alignment marks of the battery cell and the first reference mark of the replacement sheet in the second coordinate system. A control device is configured to control the laser scribing platform carrying the flexible mask to move in the first coordinate system based on the correspondence between the first coordinate system and the second coordinate system, so that the reference mark moves to the first target position, and control the moving mechanism to move the battery cell in the second coordinate system. During the movement of the battery cell, the image recognition device is controlled to identify the position of the alignment mark, so that the alignment mark moves to the second target position. The coordinates of the first target position and the second target position are consistent in the first coordinate system and the second coordinate system, so that the alignment of the reference mark and the alignment mark is completed. Then, the moving mechanism is controlled to move the battery cell along the direction from the second target position to the first target position, so that the battery cell is attached to the flexible mask.

16. The alignment system according to claim 15, characterized in that, The moving mechanism includes a robotic arm or a guide rail, and the robotic arm and the guide rail are provided with picking-up components for picking up the battery cell and the replacement sheet.

17. The alignment system according to claim 16, characterized in that, The pickup component is an adsorption mechanism or a clamping mechanism.

Images