Boron diffusion system and solar cell manufacturing production line

Abstract

The utility model relates to a boron diffusion system and a solar cell manufacturing production line. The boron diffusion system comprises a boron diffusion device; the electric cabinet comprises a cabinet body and a mainframe box, the cabinet body is provided with an accommodating cavity, and the mainframe box is arranged in the accommodating cavity and electrically connected with the boron diffusion device; a nitrogen source; and the pipeline assembly is communicated between the nitrogen source and the accommodating cavity. According to the boron diffusion system and the solar cell manufacturing production line, the service life of the electric cabinet can be prolonged, and potential safety hazards are reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a boron diffusion system and a solar cell manufacturing production line. Background Technology

[0002] During the manufacturing process of solar cells, a PN junction needs to be formed on the cells through a boron diffusion process. The boron diffusion process is completed in the boron diffusion area of ​​the workshop, which is equipped with boron diffusion devices and electrical cabinets. The electrical cabinets supply power to the boron diffusion devices so that they can perform boron diffusion manufacturing on the cells at high temperatures.

[0003] However, the diffusion of boron in solar cells generates acidic corrosive gas BCl3 (boron trichloride). BCl3 escapes into the electrical cabinet and reacts chemically with water in the air to form H3BO3 (boric acid) and HCl (hydrogen chloride), both acidic corrosive gases. Boric acid easily clogs the heat dissipation openings on the main unit chassis, and both boric acid and hydrogen chloride corrode the chassis, affecting the cabinet's lifespan and posing a significant safety hazard. Utility Model Content

[0004] Therefore, it is necessary to provide a boron diffusion system and solar cell manufacturing production line that can improve the service life of electrical cabinets and reduce safety hazards, in order to address the above problems.

[0005] A boron diffusion system, the boron diffusion system comprising:

[0006] Boron diffusion device;

[0007] An electrical cabinet includes a cabinet body and a main unit housing. The cabinet body has a receiving cavity, and the main unit housing is disposed within the receiving cavity and electrically connected to the boron diffusion device.

[0008] Nitrogen source; and

[0009] A piping assembly connecting the nitrogen source and the containment cavity.

[0010] In some embodiments, the piping assembly includes an air inlet pipe, the cabinet has an assembly hole, one end of the air inlet pipe is connected to the nitrogen source, and the other end of the air inlet pipe passes through the assembly hole and extends into the receiving cavity.

[0011] In some embodiments, the piping assembly further includes an intake valve disposed on the intake pipe.

[0012] In some embodiments, the electrical cabinet further includes a pressure sensor disposed within the receiving cavity and used to collect the air pressure within the receiving cavity, wherein the air inlet valve is configured to close when the air pressure within the receiving cavity is equal to or greater than a set pressure threshold.

[0013] In some embodiments, the electrical cabinet further includes a fixing frame, which is installed in the receiving cavity and has a fixing hole, and the other end of the air inlet pipe is held in the fixing hole.

[0014] In some embodiments, the electrical cabinet further includes a seal that seals between the wall of the mounting hole and the air inlet pipe.

[0015] In some embodiments, the seal includes a first limiting portion, a second limiting portion, and a sealing portion connected between the first limiting portion and the second limiting portion. The seal has an installation channel passing through the first limiting portion, the sealing portion, and the second limiting portion. The air inlet pipe passes through the installation channel. The first limiting portion is located inside the receiving cavity and abuts against the inner wall of the receiving cavity. The sealing portion seals between the hole wall of the mounting hole and the air inlet pipe. The second limiting portion is located outside the cabinet and abuts against the outer wall of the cabinet.

[0016] In some embodiments, the seal is a rubber component or a silicone component.

[0017] In some embodiments, the cabinet is provided with a plurality of heat dissipation holes that communicate with the receiving cavity.

[0018] A solar cell manufacturing production line includes a boron diffusion system as described in any of the above embodiments.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The aforementioned boron diffusion system and solar cell manufacturing production line are designed to introduce nitrogen into the containment cavity through a pipeline assembly. On one hand, the presence of nitrogen creates a slight positive pressure within the containment cavity, making the pressure inside the cavity greater than the external pressure of the electrical cabinet. This reduces the risk of BCl3 entering the containment cavity, preventing BCl3 from reacting to form H3BO3 and HCl within the containment cavity. Consequently, the heat dissipation openings of the main unit chassis are not blocked, and the main unit chassis is less susceptible to corrosion, extending the service life of the electrical cabinet and reducing safety hazards. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of a boron diffusion system in one embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the electrical cabinet structure after the cabinet door is removed in one embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the electrical cabinet after removing the cabinet door and the main unit box in another embodiment of this application;

[0024] Figure 4 for Figure 3 The diagram shown is a structural schematic of the electrical cabinet after removing the air inlet pipe and seals.

[0025] Figure 5 This is a schematic diagram of the structure of the fixing frame in one embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the structure of the seal in one embodiment of this application.

[0027] Icon labels:

[0028] 100. Boron diffusion system;

[0029] 10. Boron diffusion device; 20. Electrical cabinet; 30. Nitrogen source; 40. Piping assembly; 50. Wires;

[0030] 21. Cabinet; 211. Receiving cavity; 212. Heat dissipation hole; 213. Cabinet body; 214. Assembly hole; 22. Main unit chassis; 23. Pressure sensor; 24. Fixing bracket; 241. Fixing hole; 25. Sealing element; 251. First limiting part; 252. Sealing part; 253. Second limiting part; 254. Installation channel; 41. Air inlet pipe; 42. Air inlet valve. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented 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 this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, the terms "first" and "second" are configured for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Please see Figure 1 and Figure 2 This application provides a boron diffusion system 100, which includes a boron diffusion device 10, an electrical cabinet 20, a nitrogen source 30, and a pipe assembly 40. The electrical cabinet 20 includes a cabinet body 21 and a main unit box 22. The cabinet body 21 has a receiving cavity 211. The main unit box 22 is disposed in the receiving cavity 211 and is electrically connected to the boron diffusion device 10. The pipe assembly 40 is connected between the nitrogen source 30 and the receiving cavity 211.

[0038] The boron diffusion device 10 includes a boron diffusion cavity and a heating element. The heating element provides a large amount of heat to the boron diffusion cavity, enabling the solar cells within the cavity to form a PN junction through boron diffusion at a high temperature. The boron diffusion device 10 is a conventional technique in this field and will not be described in detail here.

[0039] The cabinet 21 of the electrical cabinet 20 serves as a storage and installation unit. It is usually made of sheet metal. The main unit 22 is located in the receiving cavity 211 of the cabinet 21 and is electrically connected to the heating element of the boron diffusion device 10 through the wire 50 to supply power to the heating element.

[0040] Nitrogen source 30 supplies nitrogen to containment cavity 211 through pipe assembly 40, so that containment cavity 211 is maintained in a slightly positive pressure environment.

[0041] In the traditional boron diffusion process, the generated BCl3 easily diffuses into the receiving cavity 211 of the electrical cabinet 20, and reacts chemically with water in the air within the cavity 211 to form H3BO3 and HCl. The specific reaction equation is: BCl3 + H2O → H3BO3 + 3HCl. Boric acid is in the form of powdery or flaky crystals, which can block the heat dissipation openings on the main unit chassis 22 inside the electrical cabinet 20, affecting the heat dissipation of the main unit chassis 22. Furthermore, H3BO3 and HCl are acidic and can corrode the main unit chassis 22. Both of these situations will affect the service life of the electrical cabinet 20 and may easily cause safety hazards.

[0042] In this application, by designing a nitrogen source 30 to introduce nitrogen into the containment cavity 211 through a pipe assembly 40, on the one hand, the presence of nitrogen can create a slight positive pressure in the containment cavity 211, making the air pressure inside the containment cavity 211 greater than the air pressure of the external environment of the electrical cabinet 20. This can reduce the risk of BCl3 entering the containment cavity 211. In this way, BCl3 cannot react in the containment cavity 211 to form H3BO3 and HCl. Therefore, the heat dissipation opening of the main unit chassis 22 will not be blocked, and the main unit chassis 22 is also less likely to be corroded. The service life of the electrical cabinet 20 is extended, and safety hazards are reduced.

[0043] It is worth mentioning that micro-positive pressure refers to air pressure that is slightly higher than the atmospheric pressure of the external environment of the electrical cabinet 20. By setting the containment cavity 211 to micro-positive pressure, even if air pressure is applied to the main unit 22 and the cabinet 21, the main unit 22 and the cabinet 21 will not deform.

[0044] In some embodiments, the cabinet 21 includes a cabinet body 213 and a cabinet door. The cabinet body 213 is hollow and has an inlet / outlet communicating with its interior. The cabinet door is movably connected to the cabinet body 21 and can open or close the inlet / outlet. When the inlet / outlet is closed, the cabinet door and the cabinet body 213 together define a receiving cavity 211 to reduce the impact of the external environment on the main unit chassis 22. When the inlet / outlet is open, it is convenient to take out, put in, or repair the main unit chassis 22.

[0045] Please see Figures 1 to 4 In some embodiments, the piping assembly 40 includes an air inlet pipe 41, and the cabinet 21 has an assembly hole 214. One end of the air inlet pipe 41 is connected to the nitrogen source 30, and the other end of the air inlet pipe 41 passes through the assembly hole 214 and extends into the receiving cavity 211. In this way, the air inlet pipe 41 is not easy to fall off, and nitrogen can directly enter the receiving cavity 211 through the air inlet pipe 41, so as to maintain a slight positive pressure in the receiving cavity 211.

[0046] In some embodiments, the piping assembly 40 further includes an inlet valve 42 disposed on the inlet pipe 41. The inlet valve 42 can be a manual valve, a solenoid valve, or other valve structure. When the inlet valve 42 is open, nitrogen from the nitrogen source 30 is supplied to the receiving cavity 211 to maintain a slight positive pressure within the receiving cavity 211. When the inlet valve 42 is closed, the nitrogen source 30 stops supplying nitrogen to the receiving cavity 211.

[0047] By setting the intake valve 42, the nitrogen input can be started or stopped according to actual operation needs, making the nitrogen delivery more flexible.

[0048] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, the electrical cabinet 20 further includes a pressure sensor 23 disposed in the receiving cavity 211 and used to collect the air pressure in the receiving cavity 211. The air inlet valve 42 is configured to close when the air pressure in the receiving cavity 211 is equal to or greater than a set pressure threshold.

[0049] As an example, the intake valve 42 is a solenoid valve. Both the pressure sensor 23 and the intake valve 42 are electrically connected to the terminal of the solar cell manufacturing production line. The pressure sensor 23 collects the air pressure in the housing cavity 211 and feeds it back to the controller. When the air pressure in the housing cavity 211 is equal to or greater than the set pressure threshold, the controller controls the intake valve 42 to close to prevent the main unit housing 22 or cabinet 21 from deforming due to excessive air pressure in the housing cavity 211. When the air pressure in the housing cavity 211 is less than the set pressure threshold, the controller controls the intake valve 42 to open to maintain a slight positive pressure in the housing cavity 211 and prevent BC13 from entering.

[0050] Therefore, the pressure sensor 23 can monitor the air pressure inside the containment cavity 211 and cut off the nitrogen input in time when the air pressure inside the containment cavity 211 is abnormal, so as to improve the safety of use.

[0051] The pressure threshold can be set as an empirical value or as a test value obtained through specific testing.

[0052] Please see Figure 2 and Figure 5 In some embodiments, the electrical cabinet 20 further includes a fixing frame 24, which is installed in the receiving cavity 211 and has a fixing hole 241, with the other end of the air inlet pipe 41 being held in the fixing hole 241.

[0053] Optionally, the fixing frame 24 can be plate-shaped, block-shaped, or frame-shaped, etc., and can be set according to the requirements.

[0054] By fixing the other end of the air intake pipe 41 by setting fixing holes 241 on the fixing bracket 24, the possibility of the air intake pipe 41 shaking due to airflow when outputting nitrogen can be reduced, thereby improving the reliability and stability of the air intake pipe 41 installation.

[0055] Please see Figure 3 , Figure 4 and Figure 6 In some embodiments, the electrical cabinet 20 further includes a seal 25, which seals between the wall of the mounting hole 214 and the air inlet pipe 41.

[0056] As an example, the seal 25 is made of rubber or silicone. Rubber and silicone are readily available and inexpensive, which helps reduce the manufacturing cost of the electrical cabinet 20. Of course, the seal 25 can be, but is not limited to, rubber or silicone. In some other embodiments, the seal 25 can also be made of other sealing materials, such as silicone, polyurethane, acrylic, etc.

[0057] The seal 25 is sealed between the wall of the mounting hole 214 and the air inlet pipe 41. This reduces the risk that BCl3 will enter the receiving cavity 211 through the gap between the wall of the mounting hole 214 and the air inlet pipe 41 and block or corrode the main unit 22. It also reduces the probability that the internal nitrogen will leak into the external environment through the gap between the wall of the mounting hole 214 and the air inlet pipe 41, thus reducing nitrogen waste and improving the safety of the boron diffusion process.

[0058] In some embodiments, the seal 25 includes a first limiting portion 251, a second limiting portion 253, and a sealing portion 252 connected between the first limiting portion 251 and the second limiting portion 253. The seal 25 has an installation channel 254 that passes through the first limiting portion 251, the sealing portion 252, and the second limiting portion 253. An air inlet pipe 41 passes through the installation channel 254. The first limiting portion 251 is located inside the receiving cavity 211 and abuts against the inner wall of the receiving cavity 211. The sealing portion 252 seals between the wall of the mounting hole 214 and the air inlet pipe 41. The second limiting portion 253 is located outside the cabinet 21 and abuts against the outer wall of the cabinet 21. This design allows the seal 25 to be limited between the inner and outer walls of the cabinet 21, preventing the seal 25 from coming out of the mounting hole 214 and causing sealing failure. The seal 25 has a good sealing effect.

[0059] Of course, in other embodiments, the structure of the seal 25 is not limited to the one described above, and it can also be a ring structure or other structures.

[0060] Please see Figure 1 and Figure 2 In some embodiments, the cabinet 21 has multiple heat dissipation holes 212 that communicate with the receiving cavity 211. The heat generated by the main unit 22 during operation can be dissipated to the outside through the heat dissipation holes 212, so that the heat will not accumulate in the receiving cavity 211, and the risk of the main unit 22 failing due to high temperature is reduced.

[0061] Of course, the heat dissipation method is not limited to the one mentioned above. In some other embodiments, the heat generated by the main unit 22 during operation can also be dissipated to the external environment through the sheet metal cabinet 21.

[0062] This application also provides a solar cell manufacturing production line, which includes the boron diffusion system 100 as described in any of the above embodiments. The solar cell manufacturing production line of this application has the effects of any of the above embodiments, and therefore will not be described again here.

[0063] The aforementioned boron diffusion system 100 and solar cell manufacturing production line are designed to introduce nitrogen gas into the containment cavity 211 through the nitrogen source 30 and the pipeline assembly 40. On the one hand, the presence of nitrogen gas can create a slight positive pressure in the containment cavity 211, making the gas pressure inside the containment cavity 211 greater than the gas pressure of the external environment of the electrical cabinet 20. This reduces the risk of BCl3 entering the containment cavity 211. As a result, BCl3 cannot react in the containment cavity 211 to form H3BO3 and HCl. Therefore, the heat dissipation opening of the main unit 22 will not be blocked, and the main unit 22 is also less susceptible to corrosion. This extends the service life of the electrical cabinet 20 and reduces safety hazards.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A boron diffusion system, characterized in that, The boron diffusion system includes: Boron diffusion device (10); The electrical cabinet (20) includes a cabinet body (21) and a main unit box (22). The cabinet body (21) has a receiving cavity (211). The main unit box (22) is disposed in the receiving cavity (211) and is electrically connected to the boron diffusion device (10). Nitrogen source (30); and A pipe assembly (40) is connected between the nitrogen source (30) and the receiving cavity (211).

2. The boron diffusion system according to claim 1, characterized in that, The pipe assembly (40) includes an air inlet pipe (41), and the cabinet (21) has an assembly hole (214). One end of the air inlet pipe (41) is connected to the nitrogen source (30), and the other end of the air inlet pipe (41) passes through the assembly hole (214) and extends into the receiving cavity (211).

3. The boron diffusion system according to claim 2, characterized in that, The pipe assembly (40) also includes an intake valve (42) disposed on the intake pipe (41).

4. The boron diffusion system according to claim 3, characterized in that, The electrical cabinet (20) also includes a pressure sensor (23), which is located in the receiving cavity (211) and is used to collect the air pressure in the receiving cavity (211). The air inlet valve (42) is configured to close when the air pressure in the receiving cavity (211) is equal to or greater than a set pressure threshold.

5. The boron diffusion system according to claim 2, characterized in that, The electrical cabinet (20) also includes a fixing frame (24), which is installed in the receiving cavity (211) and has a fixing hole (241) on it. The other end of the air inlet pipe (41) is held in the fixing hole (241).

6. The boron diffusion system according to claim 2, characterized in that, The electrical cabinet (20) also includes a sealing element (25), which is sealed between the wall of the assembly hole (214) and the air inlet pipe (41).

7. The boron diffusion system according to claim 6, characterized in that, The sealing element (25) includes a first limiting part (251), a second limiting part (253), and a sealing part (252) connected between the first limiting part (251) and the second limiting part (253). The sealing element (25) has an installation channel (254) that passes through the first limiting part (251), the sealing part (252), and the second limiting part (253). The air inlet pipe (41) passes through the installation channel (254). The first limiting part (251) is located inside the receiving cavity (211) and abuts against the inner wall of the receiving cavity (211). The sealing part (252) seals between the hole wall of the assembly hole (214) and the air inlet pipe (41). The second limiting part (253) is located outside the cabinet (21) and abuts against the outer wall of the cabinet (21).

8. The boron diffusion system according to claim 6, characterized in that, The seal (25) is made of rubber or silicone.

9. The boron diffusion system according to claim 1, characterized in that, The cabinet (21) has multiple heat dissipation holes (212) that communicate with the receiving cavity (211).

10. A solar cell manufacturing production line, characterized in that, Includes the boron diffusion system as described in any one of claims 1 to 9 above.

Images