Static electricity removing device and photovoltaic cell production system

Abstract

The embodiment of the utility model provides an electrostatic eliminating device and a photovoltaic cell production system. The destaticizing device comprises an ionic wind knife, at least one ionic wind outlet, and at least one destaticizing device, wherein the ionic wind knife is provided with at least one ionic wind outlet which is arranged in a strip shape; the bracket is used for supporting the ion air knife; the support is rotatably connected with the ion air knife so that the position of the ion air outlet can rotate in the direction perpendicular to the strip shape. The photovoltaic cell production system comprises a conveying device, a plurality of silk-screen printing devices and a static electricity removing device, and the static electricity removing device is arranged close to the input ends of the silk-screen printing devices. According to the technical scheme provided by the embodiment of the invention, static electricity removal treatment can be carried out on a plurality of process steps of photovoltaic cell production, electrostatic adsorption in the production process of the solar cell is greatly reduced, and the produced solar cell has higher quality, more stable performance and higher conversion efficiency. And meanwhile, the service life of the screen plate can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cell technology, and in particular to a static electricity removal device and a photovoltaic cell production system. Background Art

[0002] At present, industrially produced solar cells are mainly made by printing metal electrodes on the upper and lower surfaces of silicon wafers using screen printing technology. Screen printing technology prints silver paste on the back and front of the diffused silicon wafer according to a pre-designed pattern; then, through high-temperature sintering technology, the organic carrier in the paste is burned and volatilized, and a stable silicon alloy is formed between the metal particles and the surface of the silicon wafer, thereby forming a good ohmic contact with the emitter junction, forming the upper and lower electrodes of the crystalline silicon solar cell.

[0003] During the production of solar cells, silicon wafers are transported by conveyors and moved to multiple screen printing devices with different processes for printing. During the transportation of silicon wafers, static electricity is generated. Based on static adsorption, some dirt particles are generated. These dirt particles adhere to the surface of the silicon wafer, which affects the cleanliness of the silicon wafer surface, and these dirt particles will be scattered into the slurry during the slurry printing process. During printing, if the scraper is attached with fine particles during movement, it may cause the screen to leak slurry, resulting in false printing and reducing the quality of solar cells. Utility Model Content

[0004] The embodiments of the present application provide a static electricity removal device and a photovoltaic cell production system to solve or alleviate one or more technical problems in the prior art.

[0005] As one aspect of an embodiment of the present application, an embodiment of the present application provides a static electricity removal device, including:

[0006] An ion wind knife, wherein the ion wind knife has at least one ion wind outlet, and at least one ion wind outlet is arranged in a strip shape;

[0007] The bracket is used to support the ion wind knife; the bracket is rotatably connected to the ion wind knife so that the position of the ion wind outlet can be rotated in a direction perpendicular to the strip.

[0008] As another aspect of the embodiment of the present application, the embodiment of the present application provides a photovoltaic cell production system, including:

[0009] A conveying device, the conveying device is used to convey the silicon wafer;

[0010] A plurality of screen printing devices, each of which is used to perform different stages of process treatment on the silicon wafer; the plurality of screen printing devices are set up above the conveying device according to a preset process treatment flow;

[0011] In any aspect of the above embodiments, the number of the static electricity removal device is at least one; the static electricity removal device is arranged close to the input end of the screen printing device.

[0012] The embodiment of the present application adopts the above technical solution to make the ion wind coming out of the ion wind outlet into a strip shape; when the ion wind knife acts on the conveying device and the strip shape is perpendicular to the conveying direction, the ion wind can act on the target object on the conveying device in a wider range. Furthermore, the embodiment of the present application can adjust the outlet angle of the ion wind through the rotatable connection between the bracket and the ion wind knife, so as to blow it to the target object at a suitable angle.

[0013] The embodiment of the present application adopts the above technical solution to apply the static electricity removal device to multiple process steps in the production process of photovoltaic cells. The static electricity removal treatment of multiple process steps in the production of photovoltaic cells can greatly reduce the static electricity adsorption in the production process of solar cells. The produced solar cells have higher quality, more stable performance, and higher conversion efficiency. At the same time, the static electricity removal treatment in the screen printing process reduces the static electricity adsorption on the surface of the silicon wafer, thereby reducing the generation of dirty particles, improving the cleanliness of the silicon wafer surface, avoiding the leakage of the screen plate, and reducing the factors of screen plate damage, thereby improving the service life of the screen plate.

[0014] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0016] Figure 1 An exemplary structural schematic diagram of a static electricity removal device according to an embodiment of the present application is shown.

[0017] Figure 2 A schematic diagram showing the principle of the static electricity removal process achieved by the ion air knife in an embodiment of the present application.

[0018] Figure 3 A schematic cross-sectional view of the guide surface of the ion wind outlet according to an embodiment of the present application is shown.

[0019] Figure 4 A cross-sectional schematic diagram of a guide surface of another ion wind outlet according to an embodiment of the present application is shown.

[0020] Figure 5 An exemplary structural schematic diagram of a photovoltaic cell production system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0022] Figure 1 FIG. 2 shows an exemplary structural diagram of a static electricity removal device according to an embodiment of the present application. Figure 1 As shown, the static electricity removal device includes: an ion air knife 110 and a bracket (not shown in the figure).

[0023] It should be noted that the static electricity removal device provided in the embodiment of the present application can be applied to any other product production system, and the following description will only be given using the application in a photovoltaic cell system as an example.

[0024] The ion air knife 110 has at least one ion air outlet 111 , and the at least one ion air outlet 111 is arranged in a strip shape.

[0025] In one example, the ion wind knife 110 has an ion wind outlet 111 , and the ion wind outlet 111 is slit-shaped so that the ion wind can be output in a strip-shaped form.

[0026] In another example, the ion wind knife 110 has 5 or 8 or more than 5 ion wind outlets 111. The multiple ion wind outlets 111 are arranged in a row according to a preset interval, so that the ion winds from the multiple ion wind outlets 111 can be continuously output in a line. Figure 1 The ion wind knife 110 shown in FIG. The shape of the ion wind outlet 111 can be a circular hole, an ellipse, a narrow slit, or any other shape. When the ion wind outlet 111 is a narrow slit, the long side of the slit is approximately parallel to or parallel to the arranged strip.

[0027] The at least one ion wind outlet 111 of the ion wind knife 110 is arranged in a strip shape, so that the ion wind can be blown to any position on the target object, ensuring that static electricity can be removed at every position on the target object.

[0028] The bracket is used to support the ion air knife 110. Figure 1The bracket is not shown. However, it can be understood that a bracket of any shape or structure can support the ion wind knife 110 from the ground, or can hang the ion wind knife 110 from a truss, all of which are within the scope disclosed in the embodiments of the present application. The connection between the bracket and the ion wind knife 110 adopts a rotatable connection so that the ion wind knife 110 can rotate at an angle relative to the bracket. The rotation of the ion wind knife 110 can be an overall rotation of the entire ion wind knife 110 device, or it can be a rotation of the air duct in which the ion wind outlet 111 is set in the ion wind knife 110. The rotatable connection of the ion wind knife 110 allows the position of the ion wind outlet 111 to rotate in a direction perpendicular to the bar, thereby adjusting the outlet angle of the ion wind.

[0029] In one example, a circular hole is provided at the connecting end of the bracket, and the circular hole can be mounted on the ion wind knife 110, and by arranging a bolt locking in the radial direction of the circular hole, the position of the ion wind outlet 111 can be freely adjusted and then locked, thereby achieving the adjustment of the ion wind outlet angle.

[0030] In the embodiment of the present application, the static electricity removal device provided can adjust the outlet angle of the ion wind so that the ion wind can be blown onto the silicon wafer 300 during the screen printing process at a preset angle. Since silver paste will fall onto the silicon wafer 300 during screen printing, if the ion wind is blown toward the silicon wafer 300, it will affect the flatness of the silver paste, and even affect the product quality of the solar cell. Therefore, the embodiment of the present application adjusts the outlet angle of the ion wind to blow toward the silicon wafer 300 at an angle that does not affect the flatness of the silver paste, thereby achieving the effect of static electricity removal without affecting product quality.

[0031] Figure 2 FIG. 1 is a schematic diagram showing the principle of the ion air knife 110 in the embodiment of the present application to realize the static electricity removal process. Figure 2 As shown, the ion rod 131 can be placed in an air duct, and the air duct is connected to a compressed air source. The ion rod 131 is connected to an AC power supply, and a high voltage power supply 121 is applied to the ion rod 131. The electric field generated by the ion rod 131 ionizes the surrounding air, and the air is ionized into positive ions and negative ions. At least one ion wind outlet 111 is arranged in the air duct, and the generated positive and negative ions are blown out from the ion wind outlet 111 along with the air. When the ion wind blows toward the target object surface 410, the negative ions are attracted by the positive ions on the target object surface 410, neutralize static electricity, and remove the positrons on the target object surface 410. The positive ions in the ion wind send a repulsive effect with the positive ions in the target object, and disappear rapidly in the atmosphere.

[0032] The embodiment of the present application can make the ion wind coming out of the ion wind outlet 111 into a strip shape; when the ion wind knife 110 acts on the conveying device 210 and the strip shape is perpendicular to the conveying direction, the ion wind can act on the target object on the conveying device 210 in a wider range. Furthermore, the embodiment of the present application can adjust the outlet angle of the ion wind through the rotatable connection between the bracket and the ion wind knife 110, so as to blow to the target object at a suitable angle.

[0033] In one embodiment, the ion air knife 110 is provided with a guide surface 140 at the ion air outlet 111 , and the guide length of the guide surface 140 is 2-10 mm.

[0034] Figure 3 FIG. 1 is a schematic cross-sectional view of the guide surface 140 of the ion wind outlet 111 of the embodiment of the present application. Figure 3 As shown, by setting the guide surface 140, the wind direction of the ion wind can be pre-adjusted before the ion wind is blown toward the surface 410 of the target object, so as to avoid the ion wind being blown out in a chaotic wind direction. The ion wind is blown out from the air duct 112. The ion wind blows toward the surface 410 of the target object at an adjusted angle, so that multiple positions of the entire surface 410 of the target object are all affected by the ion wind of the same size and uniform distribution, so that a more comprehensive static electricity removal effect can be obtained with a smaller amount of ion wind. The smaller the amount of ion wind, the smaller the impact on the printing of the silicon wafer 300, thereby further improving the product quality of the solar cell.

[0035] Figure 4 FIG. 1 is a cross-sectional schematic diagram showing another guide surface 140 of an ion wind outlet 111 according to an embodiment of the present application. Figure 4 As shown, the guide surface 140 includes a first guide surface 141 and a second guide surface 142; the first guide surface 141 and the second guide surface 142 are arranged opposite to each other; the angles between the first guide surface 141 and the second guide surface 142 and the strip are both less than 5°. The angles between the first guide surface 141 and the second guide surface 142 and the strip are both less than 5°, that is, the first guide surface 141 and the second guide surface 142 are arranged parallel to or approximately parallel to the strip.

[0036] By means of the guide surface 140 provided in the embodiment of the present application, the outlet wind direction of the ion wind can be further adjusted quickly and more effectively.

[0037] In the embodiment of the present application, by setting a guide surface 140 for the ion wind outlet 111, it can be further ensured that the ion wind blows toward the target object (silicon wafer 300) at a preset angle, so that the force of the ion wind on the silicon wafer 300 is controllable, further ensuring product quality.

[0038] In the embodiment of the present application, by providing the guide surface 140 for the ion wind outlet 111, the ion wind can have a thrust along the guide direction, and will flow along the preset direction for a long period of time. Therefore, when the ion wind knife 110 is set up in the photovoltaic cell production system, it can have a larger height range, that is, compared with the ion wind knife 110 without the guide surface 140, the ion wind knife 110 of the embodiment of the present application can achieve the same effect when it is set up at a higher position.

[0039] The other components of the static electricity removal device in the above embodiment can be adopted by various technical solutions known to ordinary technicians in this field now and in the future, and will not be described in detail here.

[0040] Figure 5 FIG. 2 shows an exemplary structural schematic diagram of a photovoltaic cell production system according to an embodiment of the present application. Figure 5 As shown, the photovoltaic cell production system includes: a conveying device 210, a plurality of screen printing devices (220, 230 and 240) and a static electricity removal device (510, 520 and 530) of any implementation in the above embodiments. The photovoltaic cell production system is used to perform corresponding process treatment on the silicon wafer 300 to produce a solar cell.

[0041] The conveying device 210 is used to convey the silicon wafer 300. The conveying device 210 can be a conveyor belt or a mechanical device, etc., which is not limited in the embodiment of the present application.

[0042] The plurality of screen printing devices are respectively used to perform different stages of process treatment on the silicon wafer 300; the plurality of screen printing devices are set up above the conveying device 210 according to the preset process treatment flow. Among them, in the screen printing device, the end where the silicon wafer 300 is input is the input end, and the end where the silicon wafer 300 is output is the output end. The silicon wafer 300 enters the bottom of the screen printing device from the input end, and moves to the output end of the screen printing device as it is conveyed by the conveying device 210, and the screen printing process of this stage is completed.

[0043] The number of static electricity removal devices is at least one; the static electricity removal device is arranged near the input end of the screen printing device. The static electricity removal device is arranged near the input end of the screen printing device, so that the silicon wafer 300 can be subjected to static electricity removal before being input into the screen printing device, and then the silicon wafer 300 is printed, thereby ensuring the printing quality.

[0044] In one example, in a photovoltaic cell production system, the first screen printing device is a back electrode printing device 220, and the silicon wafer 300 entering the back electrode printing device 220 has been processed by processes such as cleaning and texturing, diffusion process, selective emitter, front oxide layer deposition, PSG removal, plasma edge cutting, and back oxide layer deposition. During these process treatments, some static electricity may have been generated on the surface of the silicon wafer 300. Therefore, the anti-static device is set close to the input end of the screen printing device, and the silicon wafer 300 can be treated for anti-static treatment before the first step of screen printing to ensure the printing quality of the silicon wafer 300.

[0045] In another example, in a photovoltaic cell production system, the static electricity removal device provided by any of the above-mentioned embodiments can be selectively set at the input end of the process equipment such as cleaning and texturing, diffusion process, selective emitter, front oxide layer deposition, PSG removal, plasma edge engraving and post oxide layer deposition according to actual conditions.

[0046] In the embodiment of the present application, since the multiple processes of screen printing are subjected to anti-static treatment, the dirty particles in screen printing are reduced, and the screen can be better protected, the probability of screen damage is reduced, and the service life of the screen is increased. The screen is an indispensable accessory in the screen printing process. If the screen is damaged, it will cause leakage during printing and virtual printing on the silicon wafer 300. Therefore, the quality of the screen determines the product quality of the silicon wafer 300 solar cell. Therefore, the embodiment of the present application, based on the anti-static treatment of the entire process of multiple screen printing processes, can also further improve the product quality of solar cells from the perspective of protecting the screen.

[0047] The embodiment of the present application adopts the above technical solution to apply the static electricity removal device to multiple process steps in the photovoltaic cell production process. The static electricity removal treatment of multiple process steps in the photovoltaic cell production process can greatly reduce the static electricity adsorption in the solar cell production process. The produced solar cell has higher quality, more stable performance, and higher conversion efficiency. At the same time, the static electricity removal treatment in the screen printing process reduces the static electricity adsorption on the surface of the silicon wafer 300, thereby reducing the generation of dirty particles, improving the cleanliness of the silicon wafer surface, avoiding screen leakage, and reducing the factors of screen damage, thereby improving the service life of the screen.

[0048] In one embodiment, in the static electricity removal device, the position of the ion wind outlet 111 is adjusted according to the conveying slope of the silicon wafer 300, the purge angle and / or the inclination angle of the guide surface 140; the purge angle is the angle formed by the wind direction of the ion wind and the silicon wafer 300 when the ion wind from the ion wind outlet 111 blows toward the silicon wafer 300.

[0049] The silicon wafer 300 may be conveyed forward at different slopes in different screen printing processes to facilitate the corresponding screen printing processes. In the embodiment of the present application, the position of the appropriate ion wind outlet 111 is adjusted for screen printing with different process treatments, so that the ion wind blows toward the silicon wafer 300 at a suitable angle. Further, it can be avoided that the ion wind blows toward the silicon wafer 300 at a positive angle, and the wind direction is perpendicular or approximately perpendicular to the silicon wafer 300, resulting in damage to the printing effect of the silicon wafer 300.

[0050] In the embodiment of the present application, based on the fact that the guide surface 140 has an inclined angle and has a certain length of guide effect, the ion wind can be blown to the surface of the silicon wafer 300 at a smaller sweeping angle to achieve the same static electricity removal effect. Among them, the inclination angle of the guide surface 140 can be an angle relative to the vertical direction of the photovoltaic cell production system; it can also be an angle relative to the side wall of the opening when the ion wind is output from the air duct 112 in the forward direction (that is, the inclination angle relative to the case where the guide surface is not provided at the ion wind outlet).

[0051] In the embodiment of the present application, a suitable purge angle can be determined according to the printing conditions of the screen printing device. For example, when printing the back electrode, if it is silver electrode printing, there are more silver ions on the surface of the silicon wafer 300, and a smaller purge angle can be set. When printing the back electric field and positive electrode, there are more aluminum ions on the surface of the silicon wafer 300, and a larger purge angle can be set.

[0052] In one embodiment, Figure 5 As shown, the screen printing device includes: a back electrode printing device 220, a positive electrode printing device 230 and / or a back electric field printing device 240. A first static electricity removal device 510 is provided near the input end of the back electrode printing device 220, a second static electricity removal device 520 is provided near the input end of the positive electrode printing device 230, and a third static electricity removal device 530 is provided near the input end of the back electric field printing device 240. The purge angle of the first static electricity removal device 510 can be set to be less than or equal to the purge angle of the second static electricity removal device 520, and the purge angle of the second static electricity removal device 520 can be set to be less than or equal to the purge angle of the third static electricity removal device 530.

[0053] In one example, when determining the purge angle of the static electricity removal device, it can be determined based on the static electricity situation and in combination with the inclination angle of the guide surface 140 and the guide length of the guide surface 140 .

[0054] In one example, the static electricity removal requirements in each printing process can be determined according to the printing requirements of the solar cell, or according to the charge on the surface of the silicon wafer 300, and then the order of the purge angles of multiple static electricity removal devices can be determined based on the static electricity removal requirements. Then, by determining the purge angle of one of the static electricity removal devices, the purge angles of other static electricity removal devices can be determined. In this way, the set purge angle can be made more reasonable and precise.

[0055] In one embodiment, the blowing angle of the first static electricity removal device 510 is 30°-45°. Based on multiple experimental verifications, when blowing at this angle to the surface of the silicon wafer 300, the static electricity removal effect can be achieved without affecting the printing quality.

[0056] In the embodiment, the sweeping angle of the second static electricity removal device 520 is 40°-70°; the sweeping angle of the third static electricity removal device 530 can be 50°-60°.

[0057] In one example, the preset purge angle of the first static electricity removal device is 40°, the conveying slope of the silicon wafer is 15° upward, and the inclination angle of the guide surface in the ion wind knife is 45° relative to the case where no guide surface is provided. Then the position of the ion wind outlet is 20° forwardly tilted relative to the vertical direction of the photovoltaic cell production system. Among them, 20° can be calculated through geometric relationships. In the embodiment of the present application, 20°=90°-(40°-15°)-45°.

[0058] In the embodiment of the present application, the sweeping angle is first determined, and then the position of the ion wind outlet 111 is adjusted in combination with the conveying slope of the silicon wafer 300 and / or the inclination angle of the guide surface 140, so that the ion wind blows toward the silicon wafer 300 at a preset angle.

[0059] In one embodiment, the photovoltaic cell production system further includes a sintering device 250, which is disposed above the conveying device 210; and a static electricity removal device is disposed at the input end of the sintering device 250. The static electricity removal device is a fourth static electricity removal device 540. The position of the ion wind outlet 111 in the fourth static electricity removal device 540 can be adjusted with reference to the scheme in any of the above embodiments.

[0060] In one embodiment, the photovoltaic cell production system also includes a screen for screen printing, and the screen is a screen with a tape seal. The tape is glued to the grid from the mesh boundary of the screen, and the grid is a fine grid structure used to form the mesh. The tape can be glued to the PI film (polyimide film) on the screen to achieve gluing from the mesh boundary. By selecting a screen with a tape seal, it is possible to prevent the splashed dry slurry from falling onto the table surface and causing the screen to leak, further improving the service life of the screen and improving the product quality of the solar cell.

[0061] In one embodiment, the height of the ion wind knife 110 is adjusted by adjusting the bracket of the static electricity removal device. In the embodiment of the present application, the height of the ion wind knife 110 is adjusted according to the actual situation of the process stage, so that the ion wind is further blown to the surface of the silicon wafer 300 at a suitable position.

[0062] In one example, the bracket is composed of two connecting rods, which are fixedly connected by bolts. By changing the position of the bolts, the length of the bracket is adjusted, thereby adjusting the height of the ion air knife 110.

[0063] In the embodiment of the present application, the air flow rate of the air duct can be adjusted based on the height of the ion wind knife and the wind direction angle of the ion wind blown out of the ion wind outlet.

[0064] Other components of the photovoltaic cell generation system of the above embodiment may be adopted by various technical solutions known to ordinary technicians in the field now and in the future, and will not be described in detail here.

[0065] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0069] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A static electricity removal device, characterized in that: include: An ion wind knife, wherein the ion wind knife has at least one ion wind outlet, and the at least one ion wind outlet is arranged in a strip shape; A bracket, the bracket is used to support the ion air knife; The bracket is rotatably connected to the ion wind knife so that the position of the ion wind outlet can be rotated along a direction perpendicular to the strip.

2. The static electricity removal device according to claim 1, characterized in that: The ion wind knife is provided with a guide surface at the ion wind outlet, and the guide length of the guide surface is 2-10 mm.

3. The static electricity removal device according to claim 2, characterized in that: The guide surface comprises a first guide surface and a second guide surface; the first guide surface and the second guide surface are arranged opposite to each other; and the angles between the first guide surface and the second guide surface and the strip are both less than 5°.

4. A photovoltaic cell production system, characterized in that: include: A conveying device, wherein the conveying device is used to convey the silicon wafer; A plurality of screen printing devices, each of which is used to perform different stages of process treatment on the silicon wafer; The plurality of screen printing devices are installed above the conveying device according to a preset process flow; The static electricity removal device according to any one of claims 1 to 3, wherein the number of the static electricity removal device is at least one; and the static electricity removal device is arranged close to the input end of the screen printing device.

5. The photovoltaic cell production system according to claim 4, characterized in that: In the static electricity removal device, the position of the ion wind outlet is adjusted according to the conveying slope of the silicon wafer, the sweeping angle and / or the inclination angle of the guide surface; The sweep angle is an angle formed by the wind direction of the ion wind and the silicon wafer when the ion wind from the ion wind outlet blows toward the silicon wafer.

6. The photovoltaic cell production system according to claim 5, characterized in that: The screen printing device comprises: a back electrode printing device, a positive electrode printing device and / or a back electric field printing device; A first static electricity removal device is provided near the input end of the back electrode printing device, a second static electricity removal device is provided near the input end of the positive electrode printing device, and a third static electricity removal device is provided near the input end of the back electric field printing device; The sweeping angle of the first static electricity removal device is smaller than or equal to the sweeping angle of the second static electricity removal device, and the sweeping angle of the second static electricity removal device is smaller than or equal to the sweeping angle of the third static electricity removal device.

7. The photovoltaic cell production system according to claim 6, characterized in that: The sweeping angle of the first static electricity removal device is 30°-45°.

8. The photovoltaic cell production system according to claim 4, characterized in that: It also includes a sintering device, which is arranged above the conveying device; The static electricity removal device is provided at the input end of the sintering device.

9. The photovoltaic cell production system according to any one of claims 4 to 8, characterized in that: It also includes a mesh plate, which is a mesh plate with tape sealing.

10. The photovoltaic cell production system according to any one of claims 4 to 8, characterized in that: The height of the ion air knife is adjusted by adjusting the bracket of the static electricity removal device.

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