A kind of silver paste brushing equipment for crystalline silicon cell

Abstract

The application discloses a kind of silver paste brushing equipment of crystalline silicon cell, it is related to photovoltaic cell production equipment technical field.The equipment includes machine body and be located on the workbench of machine body, slurry pool is equipped on machine body, brush slurry component, transfer piece and drying assembly, wherein, drying assembly is located on the side of workbench relative to transfer piece, including the cover that is rotatably connected on machine body, cover is equipped with the drying lamp for emitting ultraviolet and heating drying silver paste surface, the preliminary baking treatment of battery brush slurry surface is carried out first after the silver paste brushing equipment is additionally provided with drying assembly, makes silver paste surface aging dry, then battery is transferred and dried, can avoid the uneven thickness of silver paste surface each position that silver paste flows and forms in transfer process, in addition, silver paste surface is aged first, can also prevent shrinkage deviation generated by shrinkage more in drying process, avoid drying and chapping in the silver paste surface of battery.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cell production equipment technology, and in particular to a silver paste brushing device for crystalline silicon cells. Background Technology

[0002] Solar photovoltaic (PV) cells are used to directly convert sunlight into electrical energy. Ground-mounted PV systems extensively use silicon solar cells, which are based on silicon and can be categorized into monocrystalline silicon, polycrystalline silicon, and amorphous silicon solar cells. In terms of overall performance, including energy conversion efficiency and lifespan, monocrystalline and polycrystalline silicon cells are superior to amorphous silicon cells. Polycrystalline silicon has a lower conversion efficiency than monocrystalline silicon but is cheaper.

[0003] Silver paste is an essential consumable in the production of solar cells. There are generally two types: front silver paste and back silver paste. Front and back silver pastes are used on the front of the photovoltaic panel, with a content of approximately 85%, while back silver paste contains 75%. They are used to collect and conduct current from the surface of the solar cells, and their performance is crucial to the photoelectric performance of the photovoltaic cells.

[0004] In photovoltaic cells, silver paste is the second most expensive material after silicon wafers, accounting for approximately 10% of the total cost. As a metallized electrode, silver paste directly affects the photoelectric conversion of photovoltaic cells, making research on silver paste formulations extremely important.

[0005] For example, Chinese Patent CN107689263B discloses a method for preparing aluminum paste for back-polished polycrystalline solar cells. This method solves the technical problems of existing aluminum pastes, such as insufficient mechanical strength of the back field paste due to high sintering temperature, resulting in reduced adhesion to the substrate, large curvature of the silicon substrate after sintering, back field detachment during electrode layer formation, inability to form good ohmic contact between the aluminum film and the silicon substrate, and low photoelectric conversion efficiency.

[0006] However, in the existing technology, after the battery cells are coated with silver paste, they are usually directly transferred to the drying equipment for drying in order to save time. At this time, the silver paste is not completely dry, and it is easy to cause the silver paste to flow during the transfer process. The thickness of the silver paste increases in some parts of the battery surface and decreases in some parts, resulting in uneven silver paste thickness. Moreover, shrinkage is likely to occur during drying. The uneven thickness of the silver paste surface can easily cause the shrinkage rate to deviate in different locations, which can easily lead to drying cracking. Summary of the Invention

[0007] To address the aforementioned technical problems and overcome the shortcomings of existing technologies, this invention provides a silver paste brushing device for crystalline silicon solar cells.

[0008] To address the above technical problems, this invention provides a silver paste brushing device for crystalline silicon batteries.

[0009] Technical benefits: A drying component was added to the silver paste application equipment. After the application is completed, the battery surface is preheated to age and dry the silver paste before the battery is transferred and dried. This avoids uneven thickness of the silver paste caused by silver paste flow during the transfer process. In addition, aging the silver paste surface first can also prevent shrinkage deviation caused by excessive shrinkage during the drying process, thus avoiding dryness and cracking on the silver paste surface of the battery.

[0010] The technical solution further defined in this invention is:

[0011] A silver paste brushing device for crystalline silicon solar cells includes a machine body and a worktable mounted on the machine body. The machine body is equipped with...

[0012] The slurry tanks, located on both sides of the workbench, are used to store liquid silver paste.

[0013] The slurry brushing assembly is movably connected between the slurry tank and the workbench, and is used to apply silver paste and brush the slurry onto the battery surface.

[0014] The transfer unit, located on the side away from the brushing assembly, is used to transfer the battery cells between the worktable and the battery transfer device.

[0015] The drying assembly, located on one side of the worktable relative to the transfer component, includes a cover rotatably connected to the machine body. The cover contains a drying lamp for emitting ultraviolet light and heating the surface of the silver paste. The cover is rotatably connected to the machine body via a rotating shaft and is driven to rotate by a drive component located on the machine body.

[0016] When the cover is closed, it seals the workbench and the battery cells on the workbench.

[0017] Furthermore, the drying lamps include several arranged in a ring, with the drying lamps equidistantly arranged on the cover. There is also a heating wire for heating between two adjacent drying lamps. The edge of the cover is provided with a sealing ring, and the worktable is provided with a sealing groove that matches the sealing ring. When connected, the sealing ring is embedded in the sealing groove.

[0018] The aforementioned crystalline silicon battery silver paste brushing equipment includes a drive motor fixed on the machine body, a drive worm gear on the output shaft of the drive motor, a drive worm wheel coaxially fixed on the rotating shaft, the drive worm wheel and the drive worm gear meshing with each other, and a vacuum insulation layer is provided in both the sealing groove and the sealing cover.

[0019] The aforementioned silver paste brushing equipment for crystalline silicon solar cells has an outwardly inclined baffle on the side of the paste tank near the worktable, and a hook-shaped baffle plate at the end of the baffle plate facing into the paste tank. The baffle plate is set close to the worktable. The brushing assembly includes a movable block that is slidably connected to the machine body, and a brush roller is rotatably connected to the movable block via a rotating shaft.

[0020] The aforementioned crystalline silicon battery silver paste brushing equipment includes a brushing motor mounted on the machine body. The output shaft of the brushing motor is equipped with a brushing screw, which penetrates a movable block and is threadedly connected to it. The end of the rotating shaft is slidably connected to the movable block via a sliding block, and a drive spring is provided between the movable block and the sliding block.

[0021] The aforementioned crystalline silicon battery silver paste brushing equipment has a rotating gear on the rotating shaft and a rotating rack meshing with it at a corresponding position on the side of the paste pool.

[0022] The aforementioned crystalline silicon battery silver paste brushing equipment includes a transfer component comprising a transfer frame fixed on a machine frame, a transfer block slidably connected to the transfer frame, and the transfer block being driven to slide by a motor screw.

[0023] The aforementioned crystalline silicon battery silver paste brushing equipment has a lifting cylinder on the transfer block, and a plate for clamping the battery cells is provided on the output shaft of the lifting cylinder. The inner side of the plate is provided with several suction cups for adsorbing the sides of the battery cells.

[0024] The beneficial effects of this invention are:

[0025] (1) In this invention, after the transfer component transfers the battery cell to the worktable, the brushing component can dip into the liquid silver paste stored in the paste pool on one side and brush the surface of the battery. After brushing, the brushing component enters the paste pool on the other side. At this time, the cover of the drying component rotates to close the worktable and the battery cell. The drying lamp and heating wire in the cover are activated. The drying lamp can emit ultraviolet light and heat the silver paste layer with the heating wire. The silver paste irradiated by ultraviolet light can solidify quickly. With heating, the initial solidification of the silver paste layer can be completed within seconds. At the same time, the integrity of the silver paste layer will not be damaged, and the silver paste layer will not crack due to uneven heating caused by a sudden rise in temperature. This ensures the brushing effect and integrity of the silver paste layer.

[0026] (2) In this invention, a sealing ring is set at the edge of the cap, which, together with the sealing groove, can prevent heat loss and ultraviolet leakage. The silver paste on both sides is heated and partially solidified. The setting of the driving component can drive the rotating shaft to rotate, thereby realizing the closing and opening of the cap. In addition, the setting of the worm gear can make the cap stay at any angle, ensuring safety.

[0027] (3) In this invention, when the entire brushing assembly moves in the slurry tank, the gear and rack can ensure that the side of the brush roller is evenly coated with silver paste. In addition, the baffle can raise the height of the brush roller, and the baffle can scrape off the excess silver paste and return it to the slurry tank. The brush roller is slidably connected to the movable block through the rotating shaft, and the spring can ensure that the brush roller is tightly attached to the battery surface on the worktable, thereby improving the uniformity of brushing.

[0028] (4) In this invention, the movement of the battery cells can be achieved by the cooperation of the transfer frame and the insert plate, and the suction cup improves the adsorption effect of the battery cells and ensures the stability during the transfer; the horizontal movement of the battery cells and the vertical lifting or lowering can be achieved by the motor screw and the lifting cylinder.

[0029] (5) In this invention, a drying component is added to the silver paste brushing equipment. After the brushing is completed, the brushed surface of the battery is first preheated to age and dry the silver paste surface. Then the battery is transferred and dried. This can avoid the silver paste flowing during the transfer process and the resulting uneven thickness of the silver paste surface. In addition, aging the silver paste surface first can also prevent the shrinkage rate deviation caused by excessive shrinkage during the drying process, and avoid the drying and cracking of the silver paste surface of the battery. Attached Figure Description

[0030] Figure 1 This is a structural diagram of Example 1;

[0031] Figure 2 This is a structural diagram of the display driver used in Example 1;

[0032] Figure 3 This is a structural diagram of the transfer component used in Example 1.

[0033] The components are as follows: 1. Machine body; 11. Workbench; 12. Slurry tank; 13. Baffle; 14. Material baffle; 2. Slurry brushing assembly; 21. Movable block; 22. Rotating shaft; 23. Brush roller; 24. Slurry brushing motor; 25. Slurry brushing screw; 26. Drive spring; 27. Rotating gear; 28. Rotating rack; 3. Transfer component; 31. Transfer block; 32. Motor screw; 33. Lifting cylinder; 34. Panel; 35. Suction cup; 4. Drying assembly; 41. Cover; 42. Drying lamp; 43. Rotating shaft; 44. Heating wire; 45. Sealing ring; 46. Sealing groove; 5. Drive component; 51. Drive motor; 52. Drive worm gear; 53. Drive worm. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0037] This embodiment provides a silver paste brushing device for crystalline silicon solar cells, the structure of which is shown in the figure. It includes a body 1 and a worktable 11 mounted on the body 1. The body 1 is provided with a paste tank 12, a brushing assembly 2, a transfer component 3, and a drying assembly 4. The paste tank 12 is located on both sides of the worktable 11 and is used to store liquid silver paste. The brushing assembly 2 is movably connected between the paste tank 12 and the worktable 11 and is used to apply silver paste to the surface of the solar cells. The transfer component 3 is located on the side away from the brushing assembly 2 and is used to transfer the solar cells between the worktable 11 and the solar cell conveying device.

[0038] The drying assembly 4 is located on one side of the workbench 11 relative to the transfer component 3. It includes a cover 41 rotatably connected to the machine body 1. The cover 41 is equipped with a drying lamp 42 for emitting ultraviolet light and heating the surface of the silver paste. The cover 41 is rotatably connected to the machine body 1 through a rotating shaft 43 and is driven to rotate by a drive component 5 on the machine body 1. When the cover 41 is closed, it seals the workbench 11 and the battery cells on the workbench.

[0039] The drying lamps 42 include several arranged in a ring. The drying lamps 42 are equidistantly arranged on the cover 41. There is also a heating wire 44 for heating between two adjacent drying lamps 42. The edge of the cover 41 is provided with a sealing ring 45. The worktable 11 is provided with a sealing groove 46 that is compatible with the sealing ring 45. When connected, the sealing ring 45 is embedded in the sealing groove 46.

[0040] The driving component 5 includes a drive motor 51 fixed on the body 1. A drive worm 53 is provided on the output shaft of the drive motor 51. A drive worm wheel 52 is coaxially fixed on the rotating shaft 43. The drive worm wheel 52 and the drive worm 53 mesh with each other. A vacuum insulation layer is provided in both the sealing groove 46 and the sealing cover 41.

[0041] The slurry tank 12 is provided with an outwardly inclined baffle 13 on the side near the workbench 11. The end of the baffle 13 is provided with a hook-shaped baffle 14 facing into the slurry tank 12. The baffle 14 is set close to the workbench 11. The brushing assembly 2 includes a movable block 21 that is slidably connected to the machine body 1. A brush roller 23 is rotatably connected to the movable block 21 via a rotating shaft 22.

[0042] The slurry brushing assembly 2 includes a slurry brushing motor 24 mounted on the machine body 1. A slurry brushing screw 25 is mounted on the output shaft of the slurry brushing motor 24. The slurry brushing screw 25 passes through and is threadedly connected to a movable block 21. The end of a rotating shaft 22 is slidably connected to the movable block 21 via a sliding block. A drive spring 26 is provided between the movable block 21 and the sliding block. A rotating gear 27 is mounted on the rotating shaft 22, and a rotating rack 28 meshing with it is located at a corresponding position on the side of the slurry tank 12.

[0043] The transfer component 3 includes a transfer frame fixed on the frame, and a transfer block 31 slidably connected to the transfer frame. The transfer block 31 is driven to slide by a motor screw 32. The transfer block 31 is equipped with a lifting cylinder 33, and the output shaft of the lifting cylinder 33 is equipped with a plate 34 for clamping the battery cells. The inner side of the plate 34 is equipped with several suction cups 35 for adsorbing the sides of the battery cells.

[0044] After the transfer unit 3 transfers the battery cell to the worktable 11, the brushing component 2 can dip into the liquid silver paste stored in the paste pool 12 on one side and brush the surface of the battery. After brushing, the brushing component 2 enters the paste pool 12 on the other side. At this time, the cover 41 of the drying component 4 rotates to close the worktable 11 and the battery cell. The drying lamp 42 and the heating wire 44 in the cover 41 are activated. The drying lamp 42 emits ultraviolet light, which, together with the heating wire 44, heats and dries the silver paste layer. The silver paste irradiated by ultraviolet light can solidify quickly. With the heating, the initial solidification of the silver paste layer can be completed within seconds. At the same time, the integrity of the silver paste layer will not be damaged, and cracking caused by uneven heating of the silver paste layer due to sudden temperature rise will not occur. This ensures the brushing effect and integrity of the silver paste layer.

[0045] This invention adds a drying component to the silver paste brushing equipment. After brushing, the brushed surface of the battery is pre-baked to age and dry the silver paste. Then, the battery is transferred and dried. This can avoid uneven thickness of the silver paste surface caused by silver paste flow during the transfer process. In addition, aging the silver paste surface first can also prevent shrinkage deviation caused by excessive shrinkage during the drying process, thus avoiding dryness and cracking on the silver paste surface of the battery.

[0046] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A kind of silver paste brushing equipment of crystalline silicon cell, including machine body and the workbench (11) on machine body, it is characterized in that: The machine body (1) is provided with a slurry pool (12) arranged on both sides of the workbench (11) for storing liquid silver slurry; a brush slurry assembly (2) movably connected between the slurry pool (12) and the workbench (11) for dipping silver slurry and brushing silver slurry on the surface of the battery; a transfer member (3) arranged on the side away from the brush slurry assembly (2) for transferring the battery sheet between the workbench (11) and the battery conveying device; a drying assembly (4) arranged on the side of the workbench (11) opposite the transfer member (3), comprising a cover (41) rotatably connected to the machine body (1), the cover (41) is provided with a drying lamp (42) for emitting ultraviolet rays and heating and drying the surface of the silver slurry, the cover (41) is rotatably connected to the machine body (1) through a rotating shaft (43), and is driven to rotate by a driving member (5) arranged on the machine body (1); the cover (41) is closed when the workbench (11) and the battery sheet on the workbench are closed; the drying lamp (42) comprises a plurality of annularly arranged drying lamps (42), a plurality of drying lamps (42) are equidistantly arranged on the cover (41), and an electric heating wire (44) for heating is arranged between adjacent two drying lamps (42); the cover (41) is provided with a sealing ring (45) on the edge, the workbench (11) is provided with a sealing groove (46) matched with the sealing ring (45), and the sealing ring (45) is embedded in the sealing groove (46) when connected; the driving member (5) comprises a driving motor (51) fixed on the machine body (1), a driving worm (53) is arranged on the output shaft of the driving motor (51), a driving worm wheel (52) is coaxially fixed on the rotating shaft (43), the driving worm wheel (52) is meshed with the driving worm (53), and vacuum heat insulation layers are arranged in the sealing groove (46) and the cover (41); the slurry pool (12) is provided with an outwardly inclined baffle (13) on the side close to the workbench (11), the end of the baffle (13) is provided with a hook-shaped material blocking plate (14) facing the slurry pool (12), and the material blocking plate (14) is arranged close to the workbench (11); the brush slurry assembly (2) comprises a movable block (21) slidably connected to the machine body (1), and a brush roller (23) is rotatably connected to the movable block (21) through a rotating shaft (22); the brush slurry assembly (2) comprises a brush slurry motor (24) arranged on the machine body (1), a brush slurry screw (25) is arranged on the output shaft of the brush slurry motor (24), the brush slurry screw (25) penetrates the movable block (21) and is threadedly connected with the movable block (21), the end of the rotating shaft (22) is slidably connected to the movable block (21) through a sliding block, and a driving spring (26) is arranged between the movable block (21) and the sliding block; a rotating gear (27) is arranged on the rotating shaft (22), and a rotating rack (28) meshed with the rotating gear (27) is arranged at the corresponding position of the side edge of the slurry pool (12).

2. The crystalline silicon cell silver paste brushing equipment according to claim 1, characterized in that: The transfer member (3) comprises a transfer frame fixed on the rack, and a transfer block (31) slidably connected with the transfer frame is arranged on the transfer frame, and the transfer block (31) is driven to slide through a motor screw (32).

3. The crystalline silicon cell silver paste brushing equipment according to claim 2, characterized in that: The transfer block (31) is provided with a lifting oil cylinder (33), and the output shaft of the lifting oil cylinder (33) is provided with a panel (34) for clamping the battery sheet, and the inner side of the panel (34) is provided with a plurality of suction cups (35) for adsorbing the side of the battery sheet.

Images