Dustproof device and solar cell production equipment
By installing an air outlet pipe on the bottom of the dust shield of the solar cell production equipment, positive pressure airflow prevents dust and impurities from entering, the internal pollution problem of the equipment is solved and the battery cell defect rate and production cost are reduced.
Patent Information
- Application Number
- CN202421826208.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-07-30
AI Technical Summary
Existing solar cell production equipment cannot completely isolate dust and impurities in the environment during the diffusion process, resulting in false star cracks and black spots in the battery cells, which have high defect rate and increase production costs.
A closed-loop air outlet pipe is installed at the bottom of the dust shield. By connecting it with the gas source inside the equipment, the gas is blown down to form a positive pressure to prevent dust and impurities from entering the equipment through the gap.
Effectively prevent dust and impurities from entering the equipment, reduce the false star cracks and black spots of the battery cell, reduce the defective yield rate, and reduce production costs.
Smart Images
Figure CN223250187U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solar cell production, and particularly relates to a dust-proof device for solar cell production and solar cell production equipment equipped with the dust-proof device. Background Art
[0002] TOPCON solar cells need to be produced in a high temperature environment of 900-1000℃ during the diffusion process. If dust and impurities in the environment fall on the cell, the impurities and dust particles will enter the silicon wafer after the diffusion process. After expansion, black spots and false star-shaped cracks will appear, which will cause the cell to degrade during EL testing (see Figure 1 During the production process of solar cells, defective products and debris caused by false star-shaped cracks and black spots account for a large proportion of the battery production cost, increasing the production cost of solar cells. Experiments have found that impurities and dust in the diffusion process environment are one of the key factors causing false star-shaped cracks and black spots in solar cells.
[0003] Currently, solar cell production utilizes automated production equipment. Because solar cell production requires a dust-free and clean environment, the various functional mechanisms involved in producing solar cells, such as the automatic loading mechanism, quartz boat, and diffusion furnace, are typically shielded from the workshop environment by assembled dust shields. However, the assembly precision of these dust shields is low, and they are often welded together or hinged together using multiple pieces of sheet metal. Gaps may exist between adjacent shields, especially the seams between the side panels and the bottom panel of the dust shield, which are hidden and often overlooked, resulting in gaps. Furthermore, a certain distance is often reserved between the equipment's base and the ground, resulting in a large gap between the dust shield and the ground. In this situation, dust and impurities from the workshop environment can easily enter the equipment through the gaps between the bottom and side panels of the dust shield during production, resulting in defective products and increased cell production costs. Current automated machinery cannot completely prevent these problems from occurring. Utility Model Content
[0004] The embodiments of the present invention provide a dustproof device and solar cell production equipment, aiming to solve the problem of defective products being produced during the diffusion production of solar cells due to impurities, dust, etc. in the environment entering the interior of the equipment.
[0005] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a dust-proof device, including: a dust-proof protective cover, a closed-loop air outlet pipe is arranged along the outer four sides of the bottom of the dust-proof protective cover, and the lower part of the air outlet pipe is scattered with multiple air outlet holes for downward air discharge; the air outlet pipe is connected to the air source through an air duct.
[0006] In a first aspect, in one achievable manner, the air outlet holes are evenly arranged along the circumferential direction of the air outlet pipe, and the inner diameter of the air outlet holes is a trumpet shape that gradually expands from top to bottom.
[0007] In one practicable manner, the air outlet is in a conical or polygonal pyramidal shape.
[0008] In a first aspect, in one achievable manner, the air bleed pipe is located inside the dustproof shield and is in communication with a compressed air pipe or a nitrogen pipe introduced into the dustproof shield.
[0009] In a first aspect, in one practicable manner, the air bleed duct is arranged along a corner of the dust shield.
[0010] In a first aspect, in one feasible manner, a through hole is provided at the bottom of the dustproof shield where the air duct connects to the air outlet pipe, and a sealing rubber ring for sealing the air duct is provided at the through hole.
[0011] In a first aspect, in one practicable manner, the air outlet pipe is fixed inside the dustproof shield by a buckle provided along the bottom of the dustproof shield.
[0012] In a first aspect, in one feasible manner, the air duct is fixed by a buckle provided on the inner wall of the dustproof shield.
[0013] In a first aspect, in one practicable manner, the air outlet pipe is arranged around the outside of the foot of the dustproof shield.
[0014] In a second aspect, the utility model provides a solar cell production device equipped with the dust-proof device.
[0015] The dustproof device provided by the present invention is arranged on the solar cell production equipment. Compared with the prior art, the beneficial effect is that: a group of air outlet pipes are installed at the bottom of the dustproof shield in the solar cell diffusion process, and are connected to the original CDA or nitrogen pipe inside the equipment with a tee, so that the gas is blown out to the lower part and outside of the equipment through the air outlet pipes, so that a positive pressure is formed inside the equipment, which can prevent external dust and impurities from entering the dustproof shield through the bottom gap, thereby ensuring the cleanliness of the interior of the equipment, avoiding or reducing the problems of false star-shaped cracks and black spots on the battery cells, reducing the number of defective battery cells and fragments, and reducing the production cost of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the appearance and structure of the dustproof device provided in an embodiment of the utility model;
[0017] Figure 2 A schematic diagram of the internal layout structure of the dustproof device provided in an embodiment of the present utility model;
[0018] Figure 3 A bottom view schematic diagram of the dustproof device provided in an embodiment of the present utility model;
[0019] Figure 4 A schematic diagram of the structure of the clip-on connection of the dustproof device provided in an embodiment of the present utility model;
[0020] Description of reference numerals:
[0021] 1. Dust cover; 2. Exhaust pipe; 3. Foot; 4. Nitrogen pipe; 5. HEPA filter; 6. Air bleed pipe; 7. Exhaust hole; 8. Buckle. DETAILED DESCRIPTION
[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0023] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0024] A drawback of existing technologies is that current solar cell diffusion equipment cannot completely isolate the equipment from the workshop environment. Although a high-efficiency filter 5 installed on the top of the equipment improves the internal atmosphere and cleanliness, the footrest 3 creates a gap between the bottom of the equipment and the ground. Dust and impurities can enter the equipment through this gap, leading to an increase in defective products and increased solar cell production costs. The dust-proof device provided by the present invention can address this problem.
[0025] Please also refer to Figures 1 to 3 The dustproof device provided by the present invention is now described. The dustproof device comprises a dustproof cover 1, a closed-loop air outlet pipe 2 disposed around the outer periphery of the bottom of the dustproof cover 1, and a plurality of air outlet holes 7 dispersedly disposed at the lower portion of the air outlet pipe 2 for discharging air downward; the air outlet pipe 2 is connected to an air source via an air duct 6.
[0026] The dust-proof device provided by the present invention is characterized in that a group of air outlet pipes 2 are installed at the bottom of the dust-proof protective cover 1 in the diffusion process of solar cells, and are connected to the original CDA or nitrogen pipe 4 inside the equipment by a tee, so that the gas is blown out to the lower part and the outside of the equipment through the air outlet pipes 2, so that a positive pressure is formed inside the equipment, thereby preventing external dust and impurities from entering the dust-proof protective cover through the gap at the bottom, thereby ensuring the cleanliness of the interior of the equipment, avoiding or reducing the problems of false star-shaped cracks and black spots on the battery cells, reducing the number of defective battery cells and fragments, and reducing the production cost of the battery cells.
[0027] Since this application only adds a gas pipeline and connects to the existing gas supply pipeline without changing the original equipment structure, the modification cost is relatively low. This application creates a positive pressure inside the equipment by installing an outward-blowing air outlet pipe 2 at the bottom of the equipment, which can physically prevent gas in the workshop environment from entering the equipment.
[0028] Regarding the setting position of the air outlet pipe, there are multiple implementation methods. Example 1: The closed-loop air outlet pipe 2 can be set around the bottom plate of the dustproof protective cover 1. At this time, the gap between the bottom plate and the side plate of the dustproof protective cover is located on the outside of the air outlet pipe, and the opening direction of the air outlet hole 7 at the lower part of the air outlet pipe 2 can be inclined in the direction of the air outlet pipe toward the gap, forming a sweeping area in the area below the gap, forming a purge protection for the gap, and blowing dust and impurities close to the gap to an area away from the gap, so that dust and impurities cannot get close to the gap, thereby preventing dust and impurities from entering the equipment through the gap at the bottom of the dustproof protective cover; Example 2: The closed-loop air outlet pipe 2 can be set around the bottom of the side plate of the dustproof protective cover 1. At this time, the gap between the bottom plate and the side plate of the dustproof protective cover 1 is located on the inside of the air outlet pipe, and the opening direction of the air outlet hole 7 at the lower part of the air outlet pipe 2 is still inclined in the direction of the air outlet pipe toward the gap, forming a purge protection for the gap. Therefore, in the above two embodiments, the opening directions of the air outlet hole 7 are opposite.
[0029] The TOPCon cell is a solar cell technology based on the principle of selective carriers. It is characterized by the use of an ultra-thin tunneling oxide layer as a passivation layer structure and is mainly used on N-type silicon substrates. This cell technology forms a passivation contact structure by preparing an ultra-thin layer of silicon oxide on the back of the cell and depositing a thin layer of doped silicon. This effectively reduces surface recombination and metal contact recombination, thereby improving the conversion efficiency and stability of the cell.
[0030] CDA stands for Compressed Dry Air. A compressed air system compresses air into high-pressure gas for storage or transmission. CDA and nitrogen are gases used in the solar cell diffusion process. Therefore, the exhaust pipe 2 in this application can directly utilize the high-pressure gas on the device, making the addition of the exhaust pipe 2 simple, convenient, and feasible.
[0031] Positive pressure refers to a gas state in which the gas pressure is higher than normal pressure (commonly known as one atmosphere pressure).
[0032] High-efficiency air filters are primarily used to capture dust particles larger than 0.5 μm and various suspended solids. Air purifiers primarily consist of a filter element and a housing. Basic requirements include high filtration efficiency, low flow resistance, and long-term continuous use to reduce consumable costs.
[0033] In some embodiments, as Figure 3 As shown, air outlet holes are evenly arranged along the circumferential direction of the air outlet pipe 2, and the inner diameter of the air outlet holes is a trumpet shape that gradually expands from top to bottom, thereby increasing the wind sweeping area and improving the dust prevention effect.
[0034] In some embodiments, the air outlet is in the shape of a cone or a polygonal pyramid. Preferably, the air outlet is in the shape of a quadrangular pyramid.
[0035] In some embodiments, as Figure 2 As shown, the air duct 6 is located inside the dustproof shield 1 and is connected to the compressed air pipe or nitrogen pipe 4 introduced into the dustproof shield 1 through a pipe joint. Since the present application only adds the air duct 6 and the air outlet pipe 2, the connection to the original air supply pipeline does not require any changes to the original equipment structure, and the modification cost is relatively low.
[0036] In some embodiments, the air duct 6 is arranged along the corner of the dust shield 1 to avoid occupying the space inside the dust shield 1 .
[0037] Alternatively, as Figure 3 As shown, the air duct 6 is arranged at any position along the side wall of the dustproof shield 1. The arrangement of the air duct 6 is based on the position of the compressed air pipe and the nitrogen pipe 4 in the dustproof shield 1 to save materials and not interfere with other components.
[0038] In some embodiments, a through hole is provided at the bottom of the dust shield 1 where the air duct 6 connects to the air outlet pipe 2. A sealing rubber ring (not shown) is provided at the through hole to seal the air duct 6. Providing a sealing rubber ring at the through hole prevents external dust and impurities from entering the dust shield through the through hole and causing defects in the battery cells.
[0039] In some embodiments, as Figure 4 As shown, the air outlet pipe 2 is fixed in the dustproof cover 1 by a buckle 8 provided along the bottom of the dustproof cover 1.
[0040] In some embodiments, as Figure 4 As shown, the air duct 6 is secured by a clip 8 provided on the inner wall of the dust shield 1. The clip 8 generally consists of a positioning member and a fastener. The positioning member guides the clip 8 smoothly, accurately, and quickly to the installation position during installation. For example, the positioning member is an arc-shaped clamp, and the fastener is a screw or bolt.
[0041] In some embodiments, as Figure 3 As shown, the air outlet pipe 2 is arranged around the outside of the foot 3 at the bottom of the dust shield 1. The foot 3 refers to a movable foot bolt 3, also known as a long foot bolt 3, which is a detachable foot bolt 3 used to fix heavy mechanical equipment with strong vibration and impact during operation.
[0042] Based on the same inventive concept, the present application also provides a solar cell production equipment, which is equipped with the above-mentioned dust-proof device, which can prevent external dust and impurities from entering the dust-proof cover through the bottom gap, thereby ensuring the cleanliness inside the equipment, avoiding or reducing the problems of false star-shaped cracks and black spots on the battery cells, reducing defective battery cells and fragments, and reducing the production cost of the battery cells.
[0043] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.
[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A dustproof device, characterized in that: include: A dustproof protective cover (1) is provided with a closed-loop air outlet pipe (2) along the outer periphery of the bottom of the dustproof protective cover (1); a plurality of air outlet holes (7) for discharging air downward are dispersedly provided at the lower part of the air outlet pipe (2); the air outlet pipe (2) is connected to an air source via an air duct (6).
2. The dustproof device according to claim 1, wherein: The air outlet holes (7) are evenly arranged along the circumferential direction of the air outlet pipe (2), and the inner diameter of the air outlet holes (7) is a trumpet shape that gradually expands from top to bottom.
3. The dustproof device according to claim 2, characterized in that: The air outlet (7) is in the shape of a cone or a polygonal pyramid.
4. The dustproof device according to claim 1, wherein: The air duct (6) is located in the dustproof protective cover (1) and is in communication with a compressed air pipe or a nitrogen pipe (4) introduced into the dustproof protective cover (1).
5. The dustproof device according to claim 4, characterized in that: The air duct (6) is arranged along the corner of the dustproof shield (1).
6. The dustproof device according to claim 1, wherein: A through hole is provided at the bottom of the dustproof shield (1) where the air duct (6) butts against the air outlet pipe (2), and a sealing rubber ring for sealing the air duct (6) is provided at the through hole.
7. The dustproof device according to claim 1, wherein: The air outlet pipe (2) is fixed inside the dustproof protective cover (1) via a buckle (8) provided along the bottom of the dustproof protective cover (1).
8. The dustproof device according to claim 1, wherein: The air duct (6) is fixed by a buckle (8) provided on the inner wall of the dustproof shield (1).
9. The dustproof device according to claim 1, wherein: The air outlet pipe (2) is arranged around the outside of the bottom foot (3) of the dustproof protective cover (1).
10. A solar cell production device, characterized in that: The device is provided with a dustproof device as described in any one of claims 1 to 9.