Thermal transfer apparatus, transfer control method, and solar cell

Abstract

The embodiment of the invention relates to a heat transfer printing device, a transfer printing control method and a solar cell, the heat transfer printing device is used for transferring an electrode pattern on a roll film to a cell piece on which the electrode pattern is to be formed, and the heat transfer printing device comprises a conveying module used for conveying the roll film and the cell piece; the positioning module is used for identifying the first mark and the second mark respectively, so that the electrode pattern on the roll film is aligned to a target position; wherein the electrode pattern on the roll film is provided with a first mark, the battery piece is provided with a second mark, and the first mark coincides with the second mark under the condition that the electrode pattern on the roll film coincides with the target position, where the electrode pattern is to be formed, of the battery piece; and the heating module is used for heating the electrode pattern on the roll film under the condition that the electrode pattern on the roll film is aligned to the target position, so that the electrode pattern is transferred to the target position.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of transfer printing, and in particular, to a thermal transfer printing device, a transfer printing control method, and a solar cell. Background Art

[0002] A solar cell is a thin photovoltaic semiconductor sheet that directly generates electricity using sunlight. As long as it is illuminated by light with a certain illuminance condition, it can instantaneously output voltage and generate current in the case of a loop. Therefore, solar cells have become a widely used clean energy source. Currently, there are some methods for solar cell metallization, such as screen printing, electroplating, etc. Among them, when performing screen printing, the position of the screen may shift slightly, resulting in an inaccurate position of the formed electrode pattern. Summary of the Invention

[0003] Based on this, in view of the above technical problems, it is necessary to provide a thermal transfer printing device, a transfer printing control method, and a solar cell that can form an electrode pattern with high fineness.

[0004] In a first aspect, the present application provides a thermal transfer printing device for transferring an electrode pattern on a roll film to a cell wafer to be formed with an electrode pattern. The thermal transfer printing device includes:

[0005] A conveying module for conveying the roll film and the cell wafer respectively;

[0006] A positioning module for respectively identifying a first mark and a second mark to align the electrode pattern on the roll film to a target position; wherein, the roll film is provided with the first mark, the cell wafer is provided with the second mark, and when the electrode pattern on the roll film coincides with the target position of the electrode pattern to be formed on the cell wafer, the first mark coincides with the second mark;

[0007] A heating module for heating the electrode pattern on the roll film when the electrode pattern on the roll film is aligned to the target position, so as to transfer the electrode pattern to the target position.

[0008] In one embodiment, it further includes:

[0009] A separating module for separating the roll film and the cell wafer after the electrode pattern is transferred to the target position.

[0010] In one embodiment, it further includes:

[0011] A cooling module for cooling the roll film after the electrode pattern is transferred to the target position;

[0012] Wherein, the separating module is used to separate the cooled roll film and the cell wafer.

[0013] In one embodiment, it further includes:

[0014] A fixing module, configured to fix the roll film located within the heating area of the heating module, so that the surface of the roll film is parallel to the surface of the battery cell.

[0015] In one embodiment, the positioning module includes:

[0016] A first imaging unit, configured to acquire a first image to identify the first mark according to the first image; the first image is an image of the roll film fixed by the fixing module;

[0017] A second imaging unit, configured to acquire a second image of the battery cell to identify the second mark according to the second image.

[0018] In one embodiment, the conveying module includes:

[0019] A rotating unit, configured to rotate the roll film so that the electrode pattern on the roll film moves to the heating area of the heating module;

[0020] A translation unit, configured to convey the battery cell to the heating area of the heating module.

[0021] In one embodiment, the conveying module further includes:

[0022] A distance adjusting unit, configured to adjust the distance between the roll film and the battery cell located in the heating area of the heating module.

[0023] In one embodiment, it further includes:

[0024] A detection module, configured to detect whether the structure already formed in the battery cell to which the electrode pattern is to be formed is qualified, so that the heating module transfers the electrode pattern to the qualified battery cell.

[0025] In one embodiment, the roll film is provided with electrode patterns of multiple battery cells, and each of the electrode patterns is respectively provided with multiple first marks.

[0026] A transfer control method, configured to control a thermal transfer device as described above, the thermal transfer method includes:

[0027] Controlling the conveying module to convey the roll film and the battery cell;

[0028] Respectively acquiring the positions of the first mark and the second mark, and adjusting the conveying module according to the positions of the first mark and the second mark, so that the electrode pattern on the roll film coincides with the target position of the battery cell where the electrode pattern is to be formed;

[0029] When the electrode pattern on the roll film is aligned to the target position, control the heating module to heat.

[0030] A solar cell is prepared by using the thermal transfer device as described above or by using the thermal transfer method as described above.

[0031] The above-mentioned thermal transfer device, transfer control method and solar cell can improve the fineness of the electrode pattern prepared on the cell by using a roll film with a higher fineness of the electrode pattern and transferring the electrode pattern on the roll film to the cell by means of thermal transfer. Moreover, by setting a first mark on the roll film and a second mark on the cell, the positions of the roll film and the cell can be aligned before thermal transfer, thus greatly improving the position accuracy of the formed electrode pattern. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 One of the schematic diagrams of the thermal transfer device according to an embodiment;

[0034] Figure 2 Another schematic diagram of the thermal transfer device according to an embodiment;

[0035] Figure 3 Another schematic diagram of the thermal transfer device according to an embodiment;

[0036] Figure 4 Another schematic diagram of the thermal transfer device according to an embodiment;

[0037] Figure 5 A flowchart of the transfer control method according to an embodiment;

[0038] Figure 6 An internal structure diagram of a computer device according to an embodiment.

[0039] Explanation of Component Labels:

[0040] Roll film: 110; Cell: 120; Conveying module: 200; Rotating unit: 210; Translating unit: 220; Positioning module: 300; First imaging unit: 310; Second imaging unit: 320; Heating module: 400; Separating module: 500; Cooling module: 600; Fixing module: 700. Detailed implementation manners

[0041] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application 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 only used to explain the present application and are not used to limit the present application.

[0042] It can be understood that the terms "first", "second", etc. used in the present application can be used in this document to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first mark can be called the second mark, and similarly, the second mark can be called the first mark.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. The meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0044] An embodiment of the present application provides a thermal transfer device for transferring an electrode pattern on a roll film to a battery cell to be formed with an electrode pattern. Among them, the electrode pattern on the roll film can be formed by a gravure printing device. Specifically, batch printing can be performed by a gravure printing device to prepare an electrode pattern on a flat flexible substrate, and the flexible substrate after preparing the electrode pattern is packaged into a roll to form a roll film. It can be understood that screen printing needs to repeatedly print different battery cells based on the same screen to form electrode patterns on each battery cell respectively. However, after the screen is printed a certain number of times, it needs to be cleaned to avoid the conductive paste printed from blocking some of the screen holes, resulting in the missing of the formed electrode pattern. Therefore, the cleaning process will cause a certain decrease in the efficiency of screen printing. However, in the embodiment of the present application, based on the thermal transfer method of the roll film, the preparation of the roll film and the thermal transfer of the electrode pattern can be synchronously implemented on two devices respectively, thereby greatly improving the preparation efficiency of the electrode pattern on the battery cell.

[0045] Figure 1 is one of the schematic diagrams of the thermal transfer device of an embodiment. Refer to Figure 1 , the thermal transfer device includes a conveying module 200, a positioning module 300, and a heating module 400.

[0046] Among them, the transmission module 200 is used to transmit the rolled film 110 and the solar cell 120 respectively. The mechanical structures for transmitting the rolled film 110 and the solar cell 120 in the transmission module 200 can be different. For example, based on the winding mode of the rolled film 110, the rolled film 110 can be transmitted by a rotating mechanical structure. And based on the rigid structure of the solar cell 120, the solar cell 120 can be transmitted by structures such as a manipulator and a suction cup, or the solar cell 120 can be transmitted by a crawler. The specific structure of the transmission module 200 is not limited in this embodiment, as long as it can transmit the rolled film 110 and the solar cell 120 to the required positions, it belongs to the protection scope of this embodiment.

[0047] The positioning module 300 is used to identify the first mark and the second mark respectively, so that the electrode pattern on the rolled film 110 is aligned to the target position. Among them, the rolled film 110 is provided with the first mark, and the solar cell 120 is provided with the second mark. When the electrode pattern on the rolled film 110 coincides with the target position of the electrode pattern to be formed on the solar cell 120, the first mark coincides with the second mark. Further, a plurality of electrode patterns of the solar cell 120 are provided on the rolled film 110, and the plurality of electrode patterns can be arranged at equal intervals along the length direction of the rolled film 110, and each electrode pattern is respectively provided with a plurality of first marks. By providing a plurality of first marks for one electrode pattern, the situation where the first marks coincide but the positions are actually misaligned due to the rotation of the electrode pattern can be reduced, thereby improving the quality of the formed electrode pattern.

[0048] After the positioning module 300 obtains the position information of the first mark and the second mark, it can transmit the above position information to an external control device, and the control device can adjust the transmission module 200 according to the obtained position information, so that the electrode pattern on the rolled film 110 coincides with the target position of the electrode pattern to be formed on the solar cell 120. Specifically, the position information can be relative position information, such as the distance information between the first mark and the second mark, or an image including the relative position between the first mark and the second mark. The position information can also be absolute position information, such as the position coordinates where the first mark and the second mark are located. The specific type of the position information is not limited in this embodiment.

[0049] Optionally, the positioning module 300 may include one imaging unit or multiple imaging units. When the positioning module 300 includes only one imaging unit, a roll film 110 made of a transparent material may be used. The transparent material may be at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyvinylchloride (PVC), polymethyl methacrylate (PMMA), polypropylene (PP), and polycarbonate (PC). The imaging range of the imaging unit includes the area where the roll film 110 and the solar cell 120 overlap. The imaging unit is disposed on the side of the roll film 110 away from the solar cell 120, so that the imaging unit can obtain the positions of the first mark and the second mark respectively through single imaging. When the positioning module 300 includes multiple imaging units, the imaging module can be set more flexibly. Two imaging units are respectively used to obtain images of the roll film 110 and the solar cell 120. Moreover, when the conveying distance of the roll film 110 is long, imaging units can be respectively disposed at multiple positions on the conveying path of the roll film 110 to further improve the position accuracy of the conveyance, thereby improving the position accuracy of the electrode pattern formed by thermal transfer and improving the quality of thermal transfer.

[0050] The heating module 400 is configured to heat the electrode pattern on the roll film 110 when the electrode pattern on the roll film 110 is aligned to the target position, so that the electrode pattern is transferred to the target position. Among them, the heating module 400 may be contact heating. For example, a heating table, a heating roller, etc. are used to heat any one of the roll film 110 and the solar cell 120. The heating module 400 may also be non-contact heating. For example, a thermal enclosure is used, and heating elements such as heating tubes are disposed inside the enclosure. The temperature inside the enclosure is increased by the heating tubes, and the roll film 110 and the solar cell 120 are conveyed into the enclosure for heating. It can be understood that the heating speed of contact heating is relatively fast and the preparation efficiency is relatively high. However, during the contact process, the film layer structure formed on the solar cell 120 may be damaged, or the electrode pattern on the roll film 110 may be damaged. The heating uniformity of non-contact heating is better, and the quality of the formed electrode pattern is better. However, to achieve a transfer speed similar to that of contact heating, a larger power consumption is required. Therefore, an appropriate heating method can be selected according to efficiency, power consumption, and quality requirements, and no specific limitation is made in this embodiment.

[0051] In this embodiment, by using the roll film 110 with a relatively high fineness of the electrode pattern and transferring the electrode pattern on the roll film 110 to the battery wafer 120 by means of thermal transfer, the fineness of the electrode pattern prepared on the battery wafer 120 can be improved. Moreover, by setting a first mark on the roll film 110 and a second mark on the battery wafer 120, before thermal transfer, the positions of the roll film 110 and the battery wafer 120 can be aligned first, thereby greatly improving the position accuracy of the formed electrode pattern.

[0052] Figure 2 Schematic diagram II of a thermal transfer device according to an embodiment. Refer to Figure 2 , in one of the embodiments, the conveying module 200 includes a rotating unit 210 and a translational unit 220. The rotating unit 210 and the translational unit 220 control the roll film 110 and the battery wafer 120 to move in the same direction in the heating area of the heating module 400 to avoid friction between the roll film 110 and the battery wafer 120. Among them, the rotating unit 210 is used to rotate the roll film 110 so that the electrode pattern on the roll film 110 moves to the heating area of the heating module 400. Specifically, the rotating unit 210 may include a first rotating shaft and a second rotating shaft. The roll film 110 that has not undergone thermal transfer is fixed to the first rotating shaft, and the roll film 110 that has undergone thermal transfer is fixed to the second rotating shaft. When the first rotating shaft rotates, the roll film 110 is released, and when the second rotating shaft rotates, the roll film 110 is tightened. The first rotating shaft and the second rotating shaft move simultaneously so that the roll film 110 is conveyed through the heating module 400 for thermal transfer. The rotation speeds of the first rotating shaft and the second rotating shaft can be adjusted adaptively so that the first mark is aligned with the second mark. For example, if the first mark is in front of the second mark in the moving direction of the roll film 110 and the battery wafer 120, the rotation speeds of the first rotating shaft and the second rotating shaft can be slowed down to reduce the conveying speed of the roll film 110, so that the first mark is aligned with the second mark. The translational unit 220 is used to convey the battery wafer 120 to the heating area of the heating module 400. Specifically, the translational module may include a crawler. The conveying speed of the crawler can be adjusted adaptively so that the first mark is aligned with the second mark. For example, if the first mark is in front of the second mark in the moving direction of the roll film 110 and the battery wafer 120, the conveying speed of the crawler can be increased, so that the first mark is aligned with the second mark.

[0053] In one embodiment, the conveyor module 200 further includes a distance adjustment unit (not shown). The distance adjustment unit is used to adjust the distance between the film roll 110 and the battery cell 120 in the heating area of the heating module 400. For example, the distance adjustment unit can adjust the distance between the film roll 110 and the battery cell 120 by raising or lowering the translation unit 220. In one exemplary embodiment, the distance adjustment unit can shorten the distance between the film roll 110 and the battery cell 120 in the heating area when the first and second marks coincide, and increase the distance between the film roll 110 and the battery cell 120 in the heating area when the electrode pattern is transferred to the target position. In another exemplary embodiment, the distance adjustment unit can adjust the distance between the film roll 110 and the battery cell 120 to accommodate different electrode pattern thicknesses. In yet another exemplary embodiment, the distance adjustment unit can adjust the pressure applied to the electrode pattern during thermal transfer by changing the distance between the film roll 110 and the battery cell 120, effectively minimizing the possibility of missing transferred patterns without deforming the electrode pattern. In this embodiment, the distance adjustment unit is provided to effectively improve the transfer quality of thermal transfer.

[0054] In one embodiment, the thermal transfer device further includes a separation module 500. The separation module 500 is used to separate the roll film 110 and the battery cell 120 after the electrode pattern is transferred to the target position. Figure 3 This is a third schematic diagram of a thermal transfer device according to an embodiment, referring to Figure 3 In one exemplary embodiment, the separation module 500 can be inserted into the gap between the roll film 110 and the battery cell 120 to peel the roll film 110 from the surface of the battery cell 120. In another exemplary embodiment, the separation module 500 can also be arranged on the side of the roll film 110 away from the battery cell 120 and on the recovery path of the roll film 110, so as to cause a large bend in the roll film 110, thereby peeling the roll film 110 from the surface of the battery cell 120. In this embodiment, by providing the separation module 500, the roll film 110 and the battery cell 120 can be effectively separated, and the transferred electrode pattern can be retained on the surface of the battery cell 120, thereby avoiding the problem of the roll film 110 or the battery cell 120 being lost due to the inability to separate the two, or even the loss of the thermal transfer equipment.

[0055] In one embodiment, continue with reference to Figure 3, the thermal transfer device further includes a cooling module 600. The cooling module 600 is used to cool the roll film 110 after the electrode pattern is transferred to the target position. Among them, the separation module 500 is used to separate the cooled roll film 110 and the battery chip 120. It can be understood that after the heating module 400 has just completed heating the electrode pattern, although one surface of the electrode pattern has adhered to the battery chip 120, the other surface of the electrode pattern may still adhere to the roll film 110. Therefore, by setting the cooling module 600, the temperature of the roll film 110 can be reduced after the roll film 110 passes through the heating module 400, thereby reducing the adhesion between the electrode pattern and the roll film 110 and helping the roll film 110 and the battery chip 120 to be separated better. Specifically, the cooling module 600 can be a fan or the like, and the fan blows air toward the roll film 110 to reduce the temperature of the roll film 110. It should be noted that if the distance between the heating module 400 and the separation module 500 of the roll film 110 is long, or the ambient temperature is low, the cooling module 600 may not be provided, and the roll film 110 can be cooled by relying on the ambient temperature.

[0056] Continue to refer to Figure 3 , in one embodiment, the thermal transfer device further includes a fixing module 700. The fixing module 700 is used to fix the roll film 110 located in the heating area of the heating module 400 so that the surface of the roll film 110 is parallel to the surface of the battery chip 120. Specifically, the fixing module 700 can fix the roll film 110 and apply an outward force so that the roll film 110 is laid flat above the battery chip 120. In this embodiment, by laying flat the roll film 110 through the fixing module 700, when the roll film 110 and the battery chip 120 are thermally transferred, the distances at different positions between the two surfaces are the same, so that the transfer effects at different positions are similar. Based on the above method, it is possible to effectively reduce the situation that the electrode pattern in some areas falls off due to too large a distance during transfer, or the electrode pattern in some areas is deformed due to too small a distance during transfer. That is, the quality of the electrode pattern formed by thermal transfer is effectively improved.

[0057] Figure 4 Schematic diagram four of the thermal transfer device in an embodiment, refer to Figure 4 , in one embodiment, the positioning module 300 includes a first imaging unit 310 and a second imaging unit 320. The first imaging unit 310 is used to obtain a first image to identify a first mark according to the first image; the first image is an image of the roll film 110 fixed by the fixing module 700. The second imaging unit 320 is used to obtain a second image of the battery chip 120 to identify a second mark according to the second image. Among them, the first imaging unit 310 and the second imaging unit 320 can be set at a position that is about to reach the heating area of the heating module 400, so as to avoid damaging the imaging unit due to too high a temperature of the heating module 400 and ensure the accuracy of imaging.

[0058] In one embodiment, the thermal transfer device further includes a detection module (not shown in the figure). The detection module is used to detect whether the formed structure in the battery cell 120 to which the electrode pattern is to be formed is qualified, so that the heating module 400 transfers the electrode pattern to the qualified battery cell 120. Specifically, the detection module can mark the position information of the qualified battery cell 120 and the unqualified battery cell 120. Exemplarily, during conveyance, only the qualified battery cells 120 are stopped in the heating area of the heating module 400 for thermal transfer according to the position information, while for the unqualified battery cells 120, they are controlled to directly pass through the heating area of the heating module 400, and the battery cells 120 without the transferred electrode pattern are removed at the back end. Another exemplarily, during conveyance, the unqualified battery cells 120 can also be removed first, and only the qualified battery cells 120 are conveyed to the heating area of the heating module 400 for thermal transfer. In this embodiment, by providing the detection module, the unqualified battery cells 120 can be determined in a timely manner, and only the qualified battery cells 120 are thermally transferred, thereby reducing the number of battery cells 120 that need to be thermally transferred. This can not only improve the efficiency of thermal transfer, but also reduce the consumption of the roll film 110 and lower the cost of transferring the electrode pattern.

[0059] The embodiment of the present application also provides a transfer control method for controlling the thermal transfer device as described above. Figure 5 It is a flowchart of the transfer control method of an embodiment. Refer to Figure 5 , the thermal transfer method includes S100 to S300.

[0060] S100, control the transmission module to convey the roll film 110 and the battery cell 120.

[0061] S200, respectively obtain the positions of the first mark and the second mark, and adjust the conveying module 200 according to the positions of the first mark and the second mark, so that the electrode pattern on the roll film 110 coincides with the target position of the electrode pattern to be formed on the battery cell 120.

[0062] S300, when the electrode pattern on the roll film 110 is aligned to the target position, control the heating module 400 to heat.

[0063] In this embodiment, by using the roll film 110 with a higher fineness of the electrode pattern and adopting the thermal transfer method to transfer the electrode pattern on the roll film 110 to the battery cell 120, the fineness of the electrode pattern prepared on the battery cell 120 can be improved. Moreover, by providing the first mark on the roll film 110 and the second mark on the battery cell 120, the positions of the roll film 110 and the battery cell 120 can be aligned before thermal transfer, thereby greatly improving the position accuracy of the formed electrode pattern.

[0064] The embodiments of the present application further provide a solar cell, which is prepared by using the thermal transfer device as described above or by using the thermal transfer method as described above.

[0065] It should be understood that although Figure 5 the steps in the flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, Figure 5 at least a part of the steps in

[0066] the embodiments of the present application further provide a transfer control device, which includes a transmission control module, a position adjustment module, and a heating control module. Among them, the transmission control module is used to control the transmission module to transmit the roll film 110 and the battery chip 120, the position adjustment module is used to respectively obtain the positions of the first mark and the second mark, and adjust the transmission module 200 according to the positions of the first mark and the second mark, so that the electrode pattern on the roll film 110 coincides with the target position where the electrode pattern is to be formed on the battery chip 120, and the heating control module is used to control the heating module 400 to heat when the electrode pattern on the roll film 110 is aligned to the target position.

[0067] The division of each module in the above transfer control device is only for illustrative purposes. In other embodiments, the transfer control device can be divided into different modules as needed to complete all or part of the functions of the above transfer control device. For the specific limitations of the transfer control device, reference can be made to the limitations on the transfer control method in the above text, which will not be elaborated here. Each module in the above transfer control device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0068] In one of the embodiments, a computer device is provided, and the computer device can be a terminal. The terminal can be, but is not limited to, various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. Figure 6The internal structure diagram of a computer device according to an embodiment. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. The computer program, when executed by the processor, implements a transfer control method. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, a touchpad, or a mouse, etc.

[0069] Those skilled in the art can understand that Figure 6 the structure shown in

[0070] is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0071] In one embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0072] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0073] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0074] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0075] The above embodiments only represent several implementation manners of the embodiments of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application should be subject to the appended claims.

Claims

1. A thermal transfer device, characterized in that, For transferring the electrode pattern on the roll film to the solar cell wafer to be formed with the electrode pattern, the thermal transfer device includes: A conveying module for respectively conveying the roll film and the solar cell wafer; A positioning module for respectively identifying a first mark and a second mark to align the electrode pattern on the roll film to a target position; wherein, the roll film is provided with the first mark, the solar cell wafer is provided with the second mark, and when the electrode pattern on the roll film coincides with the target position of the solar cell wafer to be formed with the electrode pattern, the first mark coincides with the second mark; A heating module for heating the electrode pattern on the roll film when the electrode pattern on the roll film is aligned to the target position, so as to transfer the electrode pattern to the target position.

2. The thermal transfer device according to claim 1, wherein, It further includes: A separating module for separating the roll film and the solar cell wafer after the electrode pattern is transferred to the target position.

3. The thermal transfer device according to claim 2, wherein, It further includes: A cooling module for cooling the roll film after the electrode pattern is transferred to the target position; wherein, the separating module is used to separate the cooled roll film and the solar cell wafer.

4. The thermal transfer device according to claim 1, characterized in that, It further includes: A fixing module for fixing the roll film located in the heating area of the heating module to make the surface of the roll film parallel to the surface of the solar cell wafer.

5. The thermal transfer device according to claim 4, wherein, The positioning module includes: A first imaging unit for acquiring a first image to identify the first mark according to the first image; the first image is an image of the roll film fixed by the fixing module; A second imaging unit for acquiring a second image of the solar cell wafer to identify the second mark according to the second image.

6. The thermal transfer device according to claim 1, characterized in that, The conveying module includes: A rotating unit for rotating the roll film to move the electrode pattern on the roll film to the heating area of the heating module; A translation unit for conveying the solar cell wafer to the heating area of the heating module.

7. The thermal transfer device according to claim 6, characterized in that, The conveying module further includes: A distance adjusting unit for adjusting the distance between the roll film and the solar cell wafer located in the heating area of the heating module.

8. The thermal transfer device according to any one of claims 1 to 7, characterized in that It further includes: A detection module for detecting whether the structure already formed in the solar cell wafer to be formed with the electrode pattern is qualified, so that the heating module transfers the electrode pattern to the qualified solar cell wafer.

9. The thermal transfer device according to any one of claims 1 to 7, characterized in that, The roll film is provided with the electrode patterns of multiple solar cell wafers, and each of the electrode patterns is respectively provided with multiple first marks.

10. A transfer control method, characterized in that, For controlling the thermal transfer device according to any one of claims 1 to 9, the thermal transfer method includes: Controlling the transmission module to convey the roll film and the solar cell wafer; Respectively obtaining the positions of the first mark and the second mark, and adjusting the conveying module according to the positions of the first mark and the second mark so that the electrode pattern on the roll film coincides with the target position of the solar cell wafer to be formed with the electrode pattern; When the electrode pattern on the roll film is aligned to the target position, controlling the heating module to heat.

11. A solar cell, characterized in that, Prepared by using the thermal transfer device according to any one of claims 1 to 9 or prepared by using the thermal transfer method according to claim 10.

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