Glue supply device, system and method applied to solar cell

Abstract

The invention provides a glue supply device, system and method applied to a solar cell, and the device comprises a glue storage container which is used for storing glue and is provided with a glue outlet; the glue pressing mechanism comprises a pressing disc, and the pressing disc is arranged in the glue storage container and covers the glue; the conveying mechanism is connected with the conveying pipeline, the conveying mechanism comprises a screw pump, a glue inlet of the screw pump is connected with a glue outlet of the glue storage container, a glue outlet of the screw pump is connected with a glue inlet of the conveying pipeline, and a glue outlet of the conveying pipeline corresponds to the glue printing screen printing plate; wherein the screw pump is used for extruding glue to the transmission pipeline, and the glue is supplied to the glue printing screen printing plate through a glue outlet of the transmission pipeline, so that glue residues can be reduced, the glue utilization rate is increased, the glue supply stability is improved, and the glue supply stability of the 0BB-based solar cell is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic equipment design, and in particular to a glue supply device, system and method for solar cell wafers. Background Art

[0002] In the photovoltaic industry, in the manufacturing of 0BB (no main grid) modules, glue printing technology is gradually becoming a key process to replace traditional ribbon welding. In glue printing technology, the ribbon is fixed to the fine grid of the cell by glue to achieve current collection and transmission.

[0003] Current glue supply solutions for stringer machines require multiple fixed-capacity glue bottles to supply glue to the printing screens. When one bottle runs out of glue, a new one must be replaced. The small opening of the bottle makes it difficult to recycle any remaining glue, which impacts glue utilization during mass production. Summary of the Invention

[0004] The embodiments of the present application provide a glue supply device, system, and method for solar cell wafers, which are at least helpful in solving the problems of glue utilization, glue supply accuracy, and glue supply operation efficiency.

[0005] According to some embodiments of the present application, the present application provides, on one hand, a glue supply device for a solar cell, comprising: A glue storage container is used to store glue and has a glue outlet; a glue pressing mechanism includes a pressure plate, which is arranged in the glue storage container and covers the glue; a conveying mechanism and a transmission pipeline, the conveying mechanism includes a screw pump, the glue inlet of the screw pump is connected to the glue outlet of the glue storage container, the glue outlet of the screw pump is connected to the glue inlet of the transmission pipeline, and the glue outlet of the transmission pipeline corresponds to the printing glue screen; wherein, the screw pump is used to squeeze the glue into the transmission pipeline, and the glue is supplied to the printing glue screen through the glue outlet of the transmission pipeline.

[0006] According to some embodiments of the present application, another embodiment of the present application further provides a glue supply system for solar cells, including the glue supply device for solar cells provided above, and the glue supply system further includes: a monitoring mechanism, a control module; The monitoring mechanism corresponds to the printing screen in a one-to-one manner, and is used to monitor the glue quantity information of the printing screen; The control module is connected to the monitoring mechanism and the conveying mechanism, and is used to control the conveying mechanism to operate according to the glue amount information, so as to supply glue to the printing screen or stop supplying glue.

[0007] According to some embodiments of the present application, another embodiment of the present application provides a method for supplying glue to a solar cell, which is applied to the aforementioned system for supplying glue to a solar cell. The method is executed by a control module and includes: Receive information on the amount of glue on the printing screen monitored by the monitoring agency; The conveying mechanism is controlled to move according to the glue amount information to supply glue to the printing screen or stop supplying glue.

[0008] The technical solution provided by the embodiments of the present application has at least the following advantages: The glue storage container is used to store glue and has a glue outlet; the glue pressing mechanism includes a pressure plate, which is arranged in the glue storage container and covers the glue; the conveying mechanism and the transmission pipeline, the conveying mechanism includes a screw pump, the glue inlet of the screw pump is connected to the glue outlet of the glue storage container, the glue outlet of the screw pump is connected to the glue inlet of the transmission pipeline, and the glue outlet of the transmission pipeline corresponds to the printing glue screen; wherein, the screw pump is used to squeeze the glue into the transmission pipeline, and the glue is supplied to the printing glue screen through the glue outlet of the transmission pipeline, which can seal the storage container through the pressure plate in the glue pressing mechanism. Glue container, to isolate the glue in the glue storage container from air; by covering the pressure plate above the glue in the glue storage container, the pressure plate is pressed down as the glue flows out of the glue outlet, and the side of the pressure plate has a certain pushing effect on the glue attached to the inner wall of the glue storage container, thereby reducing glue residue and improving glue utilization; and, through the screw pump design in the conveying mechanism, the glue in the glue storage container flows into the printing glue screen through the screw pump along the transmission pipeline, thereby improving the stability of the glue supply, thereby ensuring the stability of the glue supply of the 0BB-based solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 A schematic structural diagram of a glue supply device applied to a solar cell provided in this embodiment; Figure 2 (a) is a schematic diagram of the structure of an exhaust hole provided in this embodiment; Figure 2 (b) is a schematic diagram of the structure of another exhaust hole provided in this embodiment; Figure 3 A structural diagram of a glue supply system applied to solar cells provided in this embodiment; Figure 4 A schematic flow chart of a method for supplying adhesive to a solar cell provided in this embodiment.

[0011] Description of Figure Numbers: 10. Glue storage container; 11. Glue adding port; 20. Glue pressing mechanism; 21. Pressure plate; 211. Exhaust hole; 22. Fixed bracket; 23. Glue pressing device; 30. Conveying mechanism; 31. Screw pump; 32. Valve; 40. Transmission pipeline; 41. Main pipeline; 42. Branch pipeline; 50. String welding machine; 51. Glue printing screen; 52. Monitoring mechanism; 53. Industrial computer; 60. PLC controller; 70. Liquid level sensor. DETAILED DESCRIPTION

[0012] In the related art, solar cells include but are not limited to PERC cells (Passivated Emitter Rear Cell), IBC (Interdigitated Back Contact), TOPCon (Tunnel Oxide Passivated Contact), HIT / HJT (Heterojunction Technology) cells, solar thin-film cells, and stacked cells, or any combination thereof. Among them, solar thin-film cells include but are not limited to perovskite solar thin-film cells, copper indium selenide solar thin-film cells, gallium arsenide solar thin-film cells, and cadmium sulfide solar thin-film cells. Stacked cells include but are not limited to perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin-film cells.

[0013] In the manufacture of zero-bar (0BB) (busbar-less) modules, the crucial technical coupling between the glue screen of the stringer and the solar cells ensures precise application of glue (e.g., conductive glue or solder paste), ensures circuit interconnection, and improves module reliability. The glue screen pattern must be precisely aligned with the fine grid lines of the solar cell, requiring extremely high accuracy. Misalignment prevents the glue from fully covering the fine grid lines, leading to increased series resistance, localized connection failure, and short circuit risks. Because the glue screen pattern mirrors the grid line pattern of the solar cell, and the current collection and inter-cell series connection functions of zero-bar solar cells rely on the glue on the glue screen, the glue supply to the glue screen is crucial for the production of zero-bar solar cells.

[0014] In the relevant glue supply scheme, a single-sided glue supply system is used to supply glue to the string welding machine. The single-sided glue supply system includes: a main gas source, a sub-gas source, pipelines, valves, glue bottles, and a printing glue screen. The main gas source is connected to the sub-gas source via a pipeline. The sub-gas source is equipped with a valve. The sub-gas source is connected to the printing glue screen through a pipeline. During the glue supply process, when any printing glue screen is detected to be short of glue, the valve of the sub-gas source is controlled to open, and air pressure is applied to squeeze the glue bottle to supply glue. The glue is then transported to the printing glue screen that is short of glue through the pipeline. When the glue bottle is detected to be short of glue, it is replaced. A single string welding machine requires three glue bottles: two glue bottles supply the front of the printing glue screen and one glue bottle supplies the back of the printing glue screen. Glue bottles with a capacity of 1L / 2.5L are usually used.

[0015] The existing 1L / 2.5L glue bottles for stringer machines have small glue capacities, requiring frequent bottle changes during glue supply operations, impacting efficiency and wasting manpower. When the glue level in the bottle drops to a certain level, a low glue level indicator appears, indicating residual glue. However, the small diameter of the mouth of the existing 1L / 2.5L bottles makes it difficult to recycle the residual glue, impacting glue utilization. Furthermore, due to the air pressure range of 0.25Mpa to 0.3Mpa, the glue supply pressure is unstable when squeezing the bottle to supply glue, making it impossible to precisely control the amount of glue added and resulting in low glue supply accuracy.

[0016] The present application provides a glue supply device, system and method for solar cell wafers, wherein the device includes: a glue storage container for storing glue and having a glue outlet; a glue pressing mechanism, including a pressure plate, which is arranged in the glue storage container and covers the glue; a conveying mechanism and a transmission pipeline, wherein the conveying mechanism includes a screw pump, the glue inlet of the screw pump is connected to the glue outlet of the glue storage container, the glue outlet of the screw pump is connected to the glue inlet of the transmission pipeline, and the glue outlet of the transmission pipeline corresponds to the printing glue screen; wherein the screw pump is used to squeeze the glue into the transmission pipeline, and the glue is supplied to the printing glue screen through the glue outlet of the transmission pipeline. The plate can seal the glue storage container through the pressure plate in the glue pressing mechanism to isolate the glue in the glue storage container from the air; by covering the pressure plate above the glue in the glue storage container, the pressure plate is pressed down as the glue flows out of the glue outlet, and the side of the pressure plate has a certain pushing effect on the glue attached to the inner wall of the glue storage container, thereby reducing glue residue and improving glue utilization; and, through the screw pump design in the conveying mechanism, the glue in the glue storage container is passed through the screw pump and flows into the printing glue screen along the transmission pipeline, thereby improving the stability of the glue supply, thereby ensuring the glue supply stability of the 0BB-based solar cell.

[0017] In the description of the embodiments of this application, if technical terms include "first" and "second", the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined. Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0018] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0020] In the description of the embodiments of the present application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the embodiments of the present application. They are not intended to indicate or imply that the devices or elements referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the embodiments of the present application. For example, if the device or element in the figure is inverted, then an element described as being "below," "beneath," "below," or "below" another element or feature would be oriented "above" or "on top" of the other element or feature. Therefore, the term "below" can encompass both above and below orientations, depending on the context in which the term is used, as will be apparent to one of ordinary skill in the art. Materials can be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatially relative descriptors used herein should be interpreted accordingly.

[0021] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0022] In the description of the embodiments of the present application, "about," "approximately," "substantially," or "approximately" with reference to a numerical value of a particular parameter includes the numerical value, and a person of ordinary skill in the art will understand that the degree of deviation from the numerical value is within an acceptable tolerance for the particular parameter. For example, "about" or "approximately" with respect to a numerical value may include additional numerical values ​​within the range of 90.0% to 110.0% of the numerical value, such as within the range of 95.0% to 105.0% of the numerical value, within the range of 97.5% to 102.5% of the numerical value, within the range of 99.0% to 101.0% of the numerical value, within the range of 99.5% to 100.5% of the numerical value, or within the range of 99.9% to 100.1% of the numerical value.

[0023] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​each layer are exaggerated for better understanding and ease of description. In addition, when a component is described as being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0024] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise stated, other components are not excluded, and other components may be further included. A second component is formed or provided above or on the first component, or a second component is formed or provided on the surface of the first component, or a second component is formed or provided on one side of the first component. Embodiments in which the first component and the second component are in direct contact may be included, and embodiments in which additional components may be provided between the first component and the second component so that the first component and the second component may not be in direct contact may also be included. For the sake of simplicity and clarity, various components may be arbitrarily drawn in different proportions. In the accompanying drawings, some layers / components may be omitted for simplicity. Unless otherwise specified, a second component is formed or provided on the surface of the first component, which means that the first component is in direct contact with the second component. Among them, the above-mentioned "components" may refer to layers, films, regions, parts, structures, etc.

[0025] The terms used in the description of the various embodiments herein are intended only to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described herein and in the appended claims, the term "component" is intended to include the plural form unless the context clearly indicates otherwise. A component includes a layer, film, region, or plate.

[0026] The following detailed description of the various embodiments of the present application is provided in conjunction with the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in the various embodiments of the present application to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0027] Figure 1 A schematic structural diagram of a glue supply device applied to a solar cell provided in this embodiment; Figure 2 (a) is a schematic diagram of the structure of an exhaust hole provided in this embodiment; Figure 2 (b) is a schematic diagram of the structure of another exhaust hole provided in this embodiment; Figure 3 A structural diagram of a glue supply system applied to solar cells provided in this embodiment; Figure 4 A schematic flow chart of a method for supplying adhesive to a solar cell provided in this embodiment.

[0028] refer to Figure 1 , Figure 1 The schematic diagram of the structure of the glue supply device for solar cells provided in this embodiment. The glue supply device for solar cells provided in this embodiment includes: A glue storage container 10, used for storing glue and having a glue outlet; The glue pressing mechanism 20 includes a pressure plate 21, which is disposed in the glue storage container 10 and covers the glue; The conveying mechanism 30 and the transmission pipeline 40 include a screw pump 31. The glue inlet of the screw pump 31 is connected to the glue outlet of the glue storage container 10. The glue outlet of the screw pump 31 is connected to the glue inlet of the transmission pipeline 40. The glue outlet of the transmission pipeline 40 corresponds to the printing glue screen 51. The screw pump 31 is used to squeeze the glue into the transmission pipe 40 , and the glue is supplied to the printing screen 51 through the glue outlet of the transmission pipe 40 .

[0029] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings.

[0030] In one embodiment, the glue storage container 10 is used to store glue and has a glue outlet. Optionally, the capacity of the glue storage container 10 is greater than the capacity of the glue bottle. Optionally, the capacity of the glue storage container 10 exceeds 20L, so that 20L of glue can be stored at one time.

[0031] Optionally, the glue outlet in the glue storage container 10 is arranged at the bottom or the bottom of the side wall, so that the glue flows out from the glue outlet of the glue storage container 10 based on at least one influencing factor of the glue's own gravity, the downward pressure of the pressure plate 21 and the external suction force of the glue outlet.

[0032] The glue storage container 10 includes a glue filling port 11 for adding glue to the glue storage container 10. The design of the glue filling port 11 allows for the recycling of the glue storage container 10, thereby improving equipment utilization. Compared to existing methods in which residual glue is difficult to recycle after a glue bottle is replaced, resulting in waste of glue, the glue storage container 10 in this embodiment can significantly reduce residual glue waste due to the inclusion of the glue filling port 11.

[0033] Optionally, a liquid level sensor 70 is provided in the glue storage container 10, and the liquid level sensor 70 is used to monitor the remaining amount of glue in the glue storage container 10. During the glue supply process, the glue storage amount in the glue storage container 10 is monitored in real time by the liquid level sensor 70, so as to avoid the glue storage container 10 from running out and affecting the glue supply process. Thus, based on the real-time glue storage amount, it is convenient for the glue storage container to store glue in advance for the glue supply operation of the printing screen.

[0034] In one embodiment, the glue pressing mechanism 20 includes a pressure plate 21, which is disposed within the glue storage container 10 and covers the glue. The diameter of the pressure plate 21 matches the inner diameter of the glue storage container 10 to ensure that the pressure plate 21 forms a sealed space with the glue storage container 10 when it enters the glue storage container 10. By covering the glue in the glue storage container 10, the side of the pressure plate 21 contacts the inner wall of the glue storage container 10. As the glue flows out of the glue outlet, the side of the pressure plate 21 scrapes the glue against the inner wall of the glue storage container 10, thereby reducing glue residue and improving glue utilization.

[0035] Optionally, the glue filling port 11 is located on the top surface of the glue storage container 10. Further, the glue used in the printing screen 51 in this embodiment can be epoxy resin glue, polyurethane glue, silicone glue, UV glue, or special adhesive glue. Since any of these glues can be harmful to the human body when in contact with it, this embodiment, for safety reasons, places the glue filling port 11 on the top surface to reduce the risk of glue leakage and improve the portability of the glue filling operation.

[0036] Optionally, the glue adding port 11 is provided on the side wall of the glue storage container 10. During the glue adding process, the pressure plate 21 is lifted up and exceeds the position of the glue adding port 11, and then glue is added to the glue storage container 10. The glue adding progress needs to be monitored from other positions to prevent the glue level from exceeding the glue adding port 11 and causing glue seepage. If the pressure plate 21 can be lifted out of the glue storage container 10, then the opening design in the glue storage container 10 includes not only a glue outlet and a glue adding port 11, but also an inlet and outlet of the pressure plate 21. When the pressure plate 21 cannot be lifted out of the glue storage container 10, the glue adding progress needs to be monitored from other angles.

[0037] Preferably, the pressure plate 21 enters and exits the glue storage container 10 through the glue adding port 11. Furthermore, in this embodiment, the inlet and outlet of the pressure plate 21 are shared with the glue adding port 11, and the pressure plate 21 enters and exits the glue storage container 10 through the glue adding port 11. During the glue adding stage, after the pressure plate 21 is lifted out of the glue storage container 10 from the glue adding port 11, the glue adding operation is performed. After completion, the pressure plate 21 is extended into the glue storage container 10 again from the glue adding port 11. Furthermore, in this embodiment, the glue adding port 11 allows the pressure plate 21 to enter and exit the glue storage container 10. When the glue storage container 10 needs to be emptied during the maintenance stage, if there is residual glue in the glue storage container 10, a tool such as a scraper can be used to extend into the glue storage container 10 through the glue adding port 11 to scrape out the residual glue and recycle it, thereby ensuring that there is no residue in the glue storage container 10 after use. Compared with the existing inconvenient recycling situation, the design of the glue adding port 11 in this embodiment greatly improves the glue utilization rate and effectively solves the problems of residual glue in the glue bottle, unstable glue supply, and frequent replacement of glue bottles.

[0038] Optionally, the pressure plate 21 enters the glue storage container 10 in an inclined manner, so that one side of the pressure plate 21 contacts the glue first, and a gap is left between the other side and the surrounding side and the inner wall of the glue storage container 10, and when the other side of the pressure plate 21 is pressed down, the air between the pressure plate 21 and the glue is discharged along the gap, thereby avoiding a large area of ​​glue contacting the air.

[0039] To simplify the exhaust operation, optionally, the pressure plate 21 is provided with an exhaust hole 211 for exhausting the air between the pressure plate 21 and the glue. The exhaust hole 211 is designed to exhaust the air between the pressure plate 21 and the glue, thereby promoting air exhaust.

[0040] refer to Figure 2 (a) and Figure 2 (b) is a schematic diagram of the structure of the improved exhaust hole in the embodiment of the present application. The exhaust hole 211 is designed to be at least one of a closed through hole and an open notch to achieve the exhaust effect.

[0041] When the exhaust hole 211 adopts a closed through-hole design, the through-hole is arranged on the pressure plate 21, connecting the two end surfaces of the pressure plate 21, so that the air on the two end surfaces of the pressure plate 21 can circulate, so that when the pressure plate 21 is pressed down onto the glue in the glue storage container 10, the air on the pressure plate 21 and the glue is discharged along the through-hole.

[0042] When the vent 211 is designed as an open notch, the notch is arranged at the edge of the pressure plate 21, with the opening of the notch facing outward from the edge and communicating with both end surfaces of the pressure plate 21. This allows the pressure plate 21 to be pressed down onto the glue in the glue storage container 10, and the air between the pressure plate 21 and the glue is squeezed into the notch and discharged from the notch. Optionally, a shielding member is further arranged on the vent 211. During the non-venting phase, the shielding member blocks the vent 211 to reduce the glue from contacting the air through the vent 211.

[0043] Optionally, the glue pressing mechanism 20 also includes: a fixed bracket 22, a glue pressing device 23, the glue pressing device 23 is installed on the fixed bracket 22, and is placed above the glue storage container 10, the glue pressing device 23 is connected to the pressure plate 21, and drives the pressure plate 21 to move inside and outside the glue adding port 11. The glue pressing mechanism 20 in this embodiment is used to control the lifting and lowering of the pressure plate 21. Optionally, the fixed bracket 22 includes a mounting frame and at least two supporting legs, the mounting frame is fixedly connected to each supporting leg, and is placed above the glue adding port 11. The glue pressing device 23 is installed on the mounting frame. Since the glue pressing device 23 is used to drive the pressure plate 21 to move inside and outside the glue adding port 11, manpower is reduced and the stability of the pressure plate 21 entering and exiting the glue adding port 11 is improved.

[0044] Among them, the glue pressing device 23 can adopt one of the following: a linear motor, an electric push rod, a screw, a hydraulic cylinder, a chain / wire rope, a gear, a connecting rod, and a lift. This embodiment does not limit this, and can drive the pressure plate 21 in and out of the glue filling port 11.

[0045] Optionally, the glue pressing device 23 includes a cylinder and a connecting rod, the cylinder is fixedly mounted on the fixed bracket 22, one end of the connecting rod is fixedly connected to the output end of the cylinder, and the other end of the connecting rod is connected to the pressure plate 21. The pressure plate 21 is driven to move by the movement of the output end of the cylinder.

[0046] In one embodiment, the conveying mechanism 30 and the transmission pipeline 40 include a screw pump 31. The glue inlet of the screw pump 31 is connected to the glue outlet of the glue storage container 10, and the glue outlet of the screw pump 31 is connected to the glue inlet of the transmission pipeline 40. The glue outlet of the transmission pipeline 40 corresponds to the printing glue screen. The screw pump 31 is used to squeeze glue into the transmission pipeline 40, and the glue is supplied to the printing glue screen 51 through the glue outlet of the transmission pipeline 40. By adopting the design of delivering glue with the screw pump 31, the stability of the glue supply and delivery operation is improved, and the glue supply accuracy is improved, thereby ensuring the stability and accuracy of the glue supply to the solar cell based on OBB.

[0047] Furthermore, the conveying mechanism 30 also includes a reduction motor. The screw pump 31 includes a connecting frame, a shaft seal, and a discharge chamber. The discharge chamber is equipped with a connecting rod, a universal joint, a stator, and a rotor arranged in the direction of the glue flow. The connecting frame connects the output end of the reduction motor, the shaft seal, and the discharge chamber. The shaft seal prevents glue leakage, reduces friction, and ensures stable operation of the screw pump 31. The ends of the connecting rod are respectively connected to the shaft seal and the universal joint. The universal joint is a universal coupling or hinge coupling, which ensures stable glue transfer. The other end of the universal joint is connected to the rotor, driving the rotor to rotate when the reduction motor is in operation. In this embodiment, the rotor adopts a metal screw design, and the stator is mounted on the rotor in the form of a pipe. The discharge chamber is connected to the transmission pipe 40. The discharge chamber is a sealed chamber area within the screw pump 31 where the pressurized glue is conveyed to the outlet. The discharge chamber includes a sealed cavity. The rotor performs planetary motion (i.e., rotation and eccentric rolling) within the stator, forming a closed chamber with the inner wall of the stator. As the rotor rotates, the sealed chamber moves continuously from the suction end to the discharge end, the volume gradually decreases, and the glue is compressed and pressurized; when the sealed chamber moves to the discharge end, the chamber is completely squeezed, and the high-pressure glue is discharged through the outlet to the transmission pipe 40.

[0048] Optionally, the number of the glue outlets of the transmission pipe 40 is at least two, and the glue outlets of the transmission pipe 40 correspond one to one with the printing screen 51. The pipeline transmission design provided in this embodiment can simultaneously supply glue to multiple printing screens.

[0049] Optionally, the transmission pipeline 40 includes a main pipeline 41 and a branch pipeline 42 connected to the main pipeline 41. The glue inlet of the transmission pipeline 40 is located on the main pipeline 41, and the glue outlet of the transmission pipeline 40 is located at the end of the branch pipeline 42; the glue outlet of the transmission pipeline 40 corresponds one-to-one to the branch pipeline 42; the conveying mechanism 30 also includes a valve 32 arranged on the branch pipeline 42. When the valve 32 is open, the glue outlet on the branch pipeline 42 is allowed to discharge glue, and when the valve 32 is closed, the glue outlet on the branch pipeline 42 is prohibited from discharging glue, so that when supplying glue in batches, the glue can be accurately controlled to supply glue to the specified printing screen 51.

[0050] Due to the use of the glue supply device proposed in this embodiment, compared to the glue supply solution of the existing string welding machine, this embodiment can seal the glue storage container through the pressure plate in the glue pressing mechanism to isolate the glue in the glue storage container from the air, thereby preventing the glue from coming into contact with the glue over a large area and causing oxidation. By covering the glue in the glue storage container with the pressure plate, the pressure plate is pressed down as the glue flows out of the glue outlet. The side of the pressure plate has a certain pushing effect on the glue attached to the inner wall of the glue storage container, thereby reducing glue residue and improving glue utilization. In addition, through the screw pump design in the conveying mechanism 30, the glue in the glue storage container 10 is passed through the screw pump 31 and the transmission pipe 40 into the printing glue screen 51, thereby improving the stability of the glue supply.

[0051] refer to Figure 3 , Figure 3 A schematic diagram of the structure of a glue supply system for solar cells provided in this embodiment. In one embodiment, the present application provides a glue supply system for solar cells that supplies glue to a printing glue screen 51 on a stringer. The glue supply system includes the glue supply device for solar cells described in any one of Embodiment 1, and further includes: a monitoring mechanism 52 and a control module.

[0052] In one embodiment, the monitoring mechanism 52 corresponds to the printing screen 51 one-to-one, and the monitoring mechanism 52 is used to monitor the glue quantity information of the printing screen 51; the control module is connected to the monitoring mechanism 52 and the conveying mechanism 30, and is used to control the conveying mechanism 30 to supply glue to the printing screen 51 or stop supplying glue according to the glue quantity information.

[0053] Optionally, the control module includes a PLC controller 60 (PLC, Programmable Logic Controller) and an industrial computer 53 of the stringer 50 to which the printing screen 51 belongs; the industrial computer 53 is connected to the monitoring mechanism 52, and is used to generate a control signal indicating whether to supply glue or stop supplying glue based on the glue amount information; the PLC controller 60 is used to convert the control signal to realize the control of the conveying mechanism 30.

[0054] Optionally, the monitoring mechanism 52 is a sensor, such as a photoelectric sensor or a gravity sensor, that detects the glue amount information on the printing screen 51 and feeds it back to the industrial computer 53 of the corresponding stringer 50. When the industrial computer 53 analyzes that there is a lack of glue in the glue amount information, it generates a control signal and feeds it back to the PLC controller 60, so that the PLC controller 60 controls the conveying mechanism 30 on the transmission mechanism to start based on the control signal, thereby conveying glue to the corresponding printing screen 51. Alternatively, when the industrial computer 53 analyzes that there is sufficient glue in the glue amount information, it generates a control signal and feeds it back to the PLC controller 60, so that the PLC controller 60 controls the conveying mechanism 30 on the transmission mechanism to stop based on the control signal, thereby stopping the supply of glue to the printing screen 51.

[0055] Optionally, the glue supply device includes a liquid level sensor 70, and the PLC controller 60 is connected to the liquid level sensor 70 for receiving the remaining glue amount transmitted by the liquid level sensor 70 and giving a prompt when the remaining glue amount is lower than a preset threshold so that the operator can add glue in time.

[0056] Optionally, the glue supply device includes a valve 32 disposed on a branch pipe 42. A PLC controller 60 is connected to the valve 32. The PLC controller 60 controls the opening or closing of the valve 32 based on a control signal, such that when the valve 32 is open, glue is allowed to flow from the glue outlet on the branch pipe 42, and when the valve 32 is closed, glue is prohibited from flowing from the glue outlet on the branch pipe 42. The design of the valve 32 on the branch pipe 42 enables precise glue supply to a specific printing screen during batch glue supply operations, thereby ensuring accurate glue supply to OBB-based solar cells.

[0057] Furthermore, the stringer 50 includes a front-side glue screen and a back-side glue screen. The front-side glue screen is connected to a first branch pipe, and the back-side glue screen is connected to a second branch pipe. Both the first and second branch pipes are equipped with valves 32. When the front-side glue screen is short of glue, the industrial computer 53 generates a control signal based on the glue quantity information fed back by the monitoring mechanism 52 on the front-side glue screen and sends it to the PLC controller 60. The control signal includes identification information of the front-side glue screen. The PLC controller 60 determines that the corresponding branch pipe is the first branch pipe based on the identification information and, upon determining that the conveying mechanism 30 is activated, controls the valve 32 on the first branch pipe to open, allowing the glue in the first branch pipe to flow into the front-side glue screen. If the conveying mechanism 30 is not currently activated, the industrial computer 53 controls the valve 32 on the first branch pipe to open simultaneously with the activation of the conveying mechanism 30. When the glue quantity information on the front-side glue screen reaches the required level, the industrial computer 53 generates a control signal again and sends it to the PLC controller 60. The PLC controller 60 then controls the valve 32 on the first branch pipe to close based on the control signal. Optionally, when the PLC controller 60 controls the glue supply of multiple printing screens at the same time, it opens or closes the valve 32 on the corresponding branch pipeline according to the control signal until there is no glue supply demand, and then controls the conveying mechanism 30 on the transmission mechanism to stop to stop glue supply.

[0058] By adopting the technical solution provided by this embodiment, the glue quantity information of the printing screen 51 is monitored, and the conveying mechanism 30 is controlled based on the glue quantity information to supply or stop glue to the printing screen 51. A control signal indicating whether to supply or stop glue is generated based on the glue quantity information. The generated control signal can accurately determine the direction of glue flow, and the valve 32 is controlled to open or close based on the control signal to accurately supply glue to the specified printing screen. The glue addition amount is precisely controlled based on the control signal. That is, the valve 32 is controlled to open or close based on the control signal to supply glue to the specified printing screen, and the glue supply is promptly stopped when the glue quantity on the printing screen is sufficient, thereby ensuring stable glue supply.

[0059] Accordingly, another embodiment of the present application further provides a method for applying adhesive to a solar cell, which can be used in the adhesive supply system of Example 2. The adhesive supply method of the present application will be described in detail below with reference to the accompanying drawings. For parts that are identical or corresponding to the previous embodiment, please refer to the corresponding description of the previous embodiment and will not be described in detail below.

[0060] refer to Figure 4 , Figure 4 This is a flow chart of a method for applying glue to solar cells provided in this embodiment. In one embodiment, this application provides a method for applying glue to solar cells, which is applied to the glue supply system for solar cells in Example 3. The method is executed by a control module and includes: S10: receiving the glue quantity information of the printing glue screen monitored by the monitoring agency; S20: Controlling the conveying mechanism to actuate according to the glue amount information to supply glue to the printing screen or stop supplying glue.

[0061] Optionally, a liquid level sensor is provided in the glue storage container, and the liquid level sensor is connected to the control module.

[0062] The method provided in this embodiment further includes: receiving the remaining amount of glue in the glue storage container monitored by the liquid level sensor, and providing a prompt when the remaining amount of glue is lower than a preset threshold.

[0063] By adopting the technical solution provided by this embodiment, the transmission mechanism is controlled based on glue quantity information to supply or stop glue to the printing screen, thereby accurately controlling the amount of glue added. If any printing screen is short of glue, the glue supply device of this embodiment is activated to supply glue to the designated printing screen. When the printing screen has sufficient glue, the glue supply is promptly stopped, thereby ensuring stable glue supply. Because a liquid level sensor is used to monitor the remaining glue level in the glue storage container and to indicate when the remaining glue level falls below a preset threshold, this prevents supply interruptions during the glue supply process and improves glue supply efficiency.

[0064] Those skilled in the art will appreciate that the above-described embodiments are specific examples for implementing the present application, and that in actual applications, various changes in form and detail may be made thereto without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A glue supply device for solar cells, characterized in that: include: A glue storage container, used for storing glue and having a glue outlet; A glue pressing mechanism, comprising a pressing plate, which is arranged in the glue storage container and covers the glue; The conveying mechanism and the transmission pipeline include a screw pump, the glue inlet of the screw pump is connected to the glue outlet of the glue storage container, the glue outlet of the screw pump is connected to the glue inlet of the transmission pipeline, and the glue outlet of the transmission pipeline corresponds to the printing glue screen; The screw pump is used to squeeze the glue into the transmission pipe, and the glue is supplied to the printing screen through the glue outlet of the transmission pipe.

2. The adhesive supply device for solar cells according to claim 1, characterized in that: The pressure plate is provided with an exhaust hole for exhausting the air between the pressure plate and the glue.

3. The adhesive supply device for solar cells according to claim 1, characterized in that: The glue storage container includes a glue adding port, and the glue adding port is used to add glue into the glue storage container.

4. The adhesive supply device for solar cells according to claim 3, characterized in that: The glue adding port is located on the top surface of the glue storage container; The glue pressing mechanism also includes: a fixed bracket and a glue pressing device. The glue pressing device is installed on the fixed bracket and placed above the glue storage container. The glue pressing device is connected to the pressure plate and drives the pressure plate to move inside and outside the glue adding port.

5. The adhesive supply device for solar cells according to claim 4, characterized in that: The glue pressing device includes a cylinder and a connecting rod. The cylinder is fixedly installed on the fixed bracket. One end of the connecting rod is fixedly connected to the output end of the cylinder, and the other end of the connecting rod is connected to the pressure plate. The cylinder drives the pressure plate to move through the connecting rod.

6. The adhesive supply device for solar cells according to claim 1, characterized in that: A liquid level sensor is provided in the glue storage container, and the liquid level sensor is used to monitor the remaining amount of glue in the glue storage container.

7. The adhesive supply device for solar cells according to claim 1, characterized in that: The number of the glue outlets of the transmission pipeline is at least two, and the glue outlets of the transmission pipeline correspond to the printing glue screens one by one.

8. The adhesive supply device for solar cells according to any one of claims 1 to 7, characterized in that: The transmission pipeline includes a main pipeline and a branch pipeline connected to the main pipeline. The glue inlet of the transmission pipeline is located on the main pipeline, and the glue outlet of the transmission pipeline is located at the end of the branch pipeline. The glue outlet of the transmission pipeline corresponds to the branch pipeline one by one. The conveying mechanism further comprises a valve provided on the branch pipe, wherein the valve is opened to allow the glue outlet on the branch pipe to discharge glue, and the valve is closed to prohibit the glue outlet on the branch pipe from discharging glue.

9. A glue supply system for solar cells, characterized in that: The glue supply device according to any one of claims 1 to 8, wherein the glue supply system further comprises: a monitoring mechanism and a control module; The monitoring mechanism corresponds to the printing screen in a one-to-one manner, and is used to monitor the glue quantity information of the printing screen; The control module is connected to the monitoring mechanism and the conveying mechanism, and is used to control the conveying mechanism to actuate according to the glue amount information, so as to supply glue to the printing screen or stop supplying glue.

10. A method for supplying glue to a solar cell, applied to the glue supply system for a solar cell according to claim 9, characterized in that: The method is executed by the control module and includes: receiving glue quantity information of the printing glue screen monitored by the monitoring mechanism; The conveying mechanism is controlled to actuate according to the glue amount information to supply glue to the printing screen or stop supplying glue.

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