A heterojunction cell doctoring device

Abstract

The utility model relates to the technical field of heterojunction battery preparation, specifically relates to a kind of heterojunction battery blade coating device, comprising: closed component, its bottom is provided with blade coating station, blade coating station is suitable for installing battery body;Heating component, install in closed component, heating component is suitable for the heating to the side of battery body deviating from blade coating station;Scraper component, along horizontal direction sliding installation is in closed component, scraper component extends towards blade coating station.Working, place battery body on blade coating station, by the slurry is set to the side of battery body upside, then let scraper component and battery body upside contact, reciprocating blade coating slurry above battery body, so that slurry is evenly printed on battery body.In the process of blade coating, let heating component work to heat the side of battery body deviating from blade coating station, so that blade coating process is carried out under the condition higher than ambient temperature, to provide more possibility for the selection of slurry.

Description

Technical Field

[0001] This utility model relates to the field of heterojunction battery preparation technology, specifically to a heterojunction battery coating device. Background Technology

[0002] Heterojunction solar cells are amorphous silicon and crystalline silicon heterojunction solar cells with intrinsic thin layers. The cell uses n-type monocrystalline silicon as the substrate. From top to bottom, the front side of the cell consists of a metal current collector, a transparent conductive oxide film, a doped p-type amorphous silicon film, and an intrinsic amorphous silicon film. The pn heterojunction is composed of p-type amorphous silicon and n-type monocrystalline silicon. From bottom to top, the back side of the cell consists of a metal current collector, a transparent conductive oxide film, a doped n-type amorphous silicon film, and an intrinsic amorphous silicon film.

[0003] Currently, in mass production processes, screen printing is used for printing silver paste for heterojunction solar cells and for UV-curing adhesive coating for gridless solar cells. The operating temperature in screen printing is ambient temperature. Therefore, the paste or adhesive must be liquid at room temperature, significantly limiting the types of pastes and adhesives that can be selected for heterojunction solar cell screen printing. Furthermore, because the silver paste and adhesive need to be liquid at room temperature, they must undergo drying or UV irradiation after screen printing or coating to cure the silver paste. This increases the number of steps in battery manufacturing, leads to higher energy consumption, and limits production capacity. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of the long screen printing step and high energy consumption in the preparation process of heterojunction cells in the prior art, thereby providing a heterojunction cell coating device.

[0005] To solve the above-mentioned technical problems, this utility model provides a heterojunction battery coating device, comprising:

[0006] The enclosed component has a coating station at its bottom, which is suitable for installing the battery body.

[0007] A heating element is installed inside a closed assembly. The heating element is suitable for heating the side of the battery body away from the coating station.

[0008] The scraper assembly is slidably installed in the enclosed assembly in a horizontal direction, and the scraper assembly extends toward the coating station.

[0009] Optionally, the scraper assembly includes a telescopic member and a scraper body mounted on one end of the telescopic member, the telescopic member being slidably mounted within the enclosed assembly in a horizontal direction.

[0010] Optionally, a sliding rail is horizontally installed inside the enclosed assembly, and the end of the telescopic component facing away from the scraper body slides in cooperation with the sliding rail.

[0011] Optionally, a heating plate is installed below the coating station, which is suitable for heating the side of the battery body facing the coating station.

[0012] Optionally, the heating assembly includes multiple hot air blowers, which are spaced apart within the enclosed assembly.

[0013] Optionally, a screen printing stencil is also provided between the scraper assembly and the coating station, and the screen printing stencil is slidably installed in the closed assembly in the vertical direction.

[0014] Optionally, the screen printing stencil has a built-in auxiliary heating element.

[0015] Optionally, it also includes a conveyor belt body, a drive rotating component and an auxiliary rotating component. The conveyor belt body is wound in a ring between the drive rotating component and the auxiliary rotating component. The drive rotating component is used to drive the conveyor belt body to rotate cyclically. The scraping station is located on the conveyor belt body. The sealing component is in movable cooperation with the conveyor belt body.

[0016] The enclosure assembly includes an enclosure box body and a pair of enclosure baffles, which are respectively installed on both sides of the enclosure box body along the conveying direction of the conveyor belt body;

[0017] The enclosing baffle has an open state where it moves to open the enclosing box body to facilitate entry and exit of the coating station, and a closed state where it moves to cooperate with the conveyor belt body to completely close the enclosing box body.

[0018] Optionally, it also includes a cooling box body, located downstream of the enclosed assembly along the conveyor belt body's conveying direction, the cooling box body being movablely matched with the conveyor belt body, and cooling components being installed inside the cooling box body.

[0019] Optionally, cooling baffles are installed on both sides of the cooling box body along the conveyor belt body conveying direction, and the cooling baffles slide in conjunction with the cooling box body.

[0020] The technical solution of this utility model has the following advantages:

[0021] 1. The heterojunction battery coating device provided by this utility model includes: a closed assembly with a coating station at its bottom, the coating station being suitable for mounting the battery body; a heating assembly installed inside the closed assembly, the heating assembly being suitable for heating the side of the battery body away from the coating station; and a scraper assembly slidably installed inside the closed assembly in a horizontal direction, the scraper assembly extending toward the coating station.

[0022] In operation, the heterojunction solar cell coating apparatus places the battery body on the coating station. The slurry is applied to the upward-facing side of the battery body, and then the doctor blade assembly contacts the upper side of the battery body, scraping the slurry back and forth to evenly coat the battery body. During the coating process, a heating element is activated to heat the side of the battery body away from the coating station, allowing the coating process to proceed at temperatures higher than ambient, thus providing more options for slurry selection. Furthermore, after coating at high temperatures, the battery body automatically cures during the cooling process, shortening the steps in the heterojunction solar cell coating process, reducing the number of devices required in the fabrication process, and lowering energy consumption during heterojunction solar cell fabrication.

[0023] 2. The heterojunction battery coating apparatus provided by this utility model has a heating base plate installed below the coating station. The heating base plate is suitable for heating the side of the battery body facing the coating station. By setting the heating base plate to heat the back of the battery body, it is possible to prevent a large number of defects in the internal growth area of ​​the battery body due to the temperature difference between the front and back sides of the battery body during the coating process, thus ensuring the battery efficiency of the battery module subsequently prepared.

[0024] 3. The heterojunction battery coating device provided by this utility model has an auxiliary heating element built into the screen printing stencil. During the coating process, the screen printing stencil is placed between the squeegee assembly and the battery body. The auxiliary heating element uniformly heats the adhesive and the upper surface of the battery body, ensuring uniform surface temperature of the battery body during the coating process. This allows the slurry to solidify evenly throughout the surface of the battery body, improving the coating quality. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a heterojunction battery coating device provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the screen printing stencil provided in the embodiments of this utility model.

[0028] Figure 3 This is a schematic diagram of the overall structure of the heterojunction battery coating device provided in the embodiments of this utility model.

[0029] Explanation of reference numerals in the attached drawings: 1. Battery body; 2. Heating assembly; 3. Telescopic component; 4. Scraper body; 5. Sliding track; 6. Heating base plate; 7. Screen printing plate; 8. Auxiliary heating component; 9. Conveyor belt body; 10. Drive rotating component; 11. Auxiliary rotating component; 12. Enclosed box body; 13. Enclosed baffle; 14. Cooling box body; 15. Cooling baffle; 16. Cooling component. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Figures 1 to 3 As shown, this embodiment provides a heterojunction battery coating device, which includes a closed housing as a sealing component, a heating component 2 installed in the inner cavity of the sealing component, and a scraper assembly for coating work that is slidably installed in the sealing component.

[0033] like Figure 1 As shown, a coating station is provided at the bottom of the sealed assembly, which is used to install the battery body 1. In this embodiment, the coating station is only the location of the battery body 1 when it is coated, and is not a physical structure. In other embodiments, the coating station can be set as a groove-shaped structure, and the battery body 1 is installed in the groove-shaped coating station to improve the stability of the battery body 1 during the coating operation. The heating assembly 2 is installed in the sealed assembly, and the heating assembly 2 is adapted to heat the side of the battery body 1 away from the coating station. The scraper assembly is slidably installed in the sealed assembly in a horizontal direction, and the scraper assembly extends toward the coating station.

[0034] In operation, the heterojunction battery coating apparatus places the battery body 1 on the coating station. The slurry is applied to the upward-facing side of the battery body 1, and then the doctor blade assembly contacts the upper side of the battery body 1, scraping the slurry back and forth to evenly coat the battery body 1. During the coating process, the heating component 2 is activated to heat the side of the battery body 1 facing away from the coating station, allowing the coating process to proceed at a temperature higher than ambient, thus providing more options for slurry selection.

[0035] In this embodiment, the scraper assembly includes an electrically driven telescopic cylinder as a telescopic member 3 and a scraper body 4 installed at one end of the telescopic member 3. A sliding rail 5 is horizontally installed inside the enclosed assembly, and the end of the telescopic member 3 facing away from the scraper body 4 is slidably engaged with the sliding rail 5.

[0036] In order to ensure that the temperature of the front and back sides of the battery body 1 is uniform and to avoid the growth of a large number of defects inside the battery body 1 under the effect of temperature difference, in this embodiment, an infrared heating base plate 6 is installed below the scraping station. The heating base plate 6 is used to heat the side of the battery body 1 facing the scraping station.

[0037] The heating assembly 2 includes multiple hot air blowers, which are spaced apart at the top of the enclosed assembly's inner cavity. Simultaneously, to ensure uniform temperature distribution on the side of the battery body 1 facing the scraper assembly, a screen printing stencil 7 is also provided between the scraper assembly and the coating station. The screen printing stencil 7 is vertically slidably installed within the enclosed assembly. Specifically, both ends of the screen printing stencil are slidably mounted on two opposing inner sidewalls inside the enclosed assembly via suspension rods. The suspension rods slide up and down, causing the screen printing stencil to slide vertically within the enclosed assembly. Figure 2 As shown, the screen printing plate 7 has a built-in heating resistance wire as an auxiliary heating element 8, and the heating resistance wire is arranged in a continuous "S" shape inside the screen printing plate 7.

[0038] To achieve automated loading and unloading of battery body 1, such as Figure 3 As shown, the heterojunction battery coating device provided in this embodiment further includes a conveyor belt body 9, a driving rotating component 10, and an auxiliary rotating component 11. The conveyor belt body 9 is wound in a ring shape between the driving rotating component 10 and the auxiliary rotating component 11. The driving rotating component 10 is used to drive the conveyor belt body 9 to rotate cyclically. The coating station is located on the conveyor belt body 9, and the sealing component is movably engaged with the conveyor belt body 9. In order to cooperate with the conveyor belt body 9, the sealing box, which serves as the sealing component in this embodiment, includes a sealing box body 12 and a pair of sealing baffles 13. The pair of sealing baffles 13 are respectively installed on both sides of the sealing box body 12 along the conveying direction of the conveyor belt body 9.

[0039] like Figure 3As shown, the sealing baffle 13 has an open state where it moves to open the sealing box body 12 to facilitate entry and exit of the coating station, and a closed state where it moves to cooperate with the conveyor belt body 9 to completely close the sealing box body 12. Specifically, there are matching slide rails on both sides of the openings on the left and right sides of the sealing box body 12, and the sealing baffle 13 slides in cooperation with the matching slide rails. In this embodiment, the matching slide rails are arranged vertically. In some other embodiments, the matching slide rails can also be arranged back and forth in a direction perpendicular to the paper surface, and the sealing baffle 13 slides in a direction perpendicular to the paper surface. The conveyor belt body 9 drives the battery body 1 to be conveyed from right to left. When the conveyor belt body 9 drives the battery body 1 close to the sealing box body 12, the sealing baffle 13 on the right side rises to the open state. The battery body 1 smoothly enters the sealing box body 12 under the drive of the conveyor belt body 9. After the battery body 1 reaches directly above the heating base plate 6, the conveyor belt body 9 stops running, and the sealing baffle 13 on the right side falls to the closed state. Then, the screen printing plate 7 falls down to contact the upper surface of the battery body 1. Paste is added to the screen printing plate 7, and simultaneously, the telescopic component 3 drives the squeegee body 4 to contact the screen printing plate 7. The telescopic component 3 then drives the squeegee body 4 to scrape the paste on the screen printing plate 7 back and forth, allowing the paste to be printed onto the battery body 1 below through the holes in the screen printing plate 7. After the paste printing is completed, the sealing baffle 13 located on the left side of the sealed box body 12 rises to the open state. The conveyor belt body 9 runs, causing the battery body 1 to move to the left out of the sealed box body 12. Then, the sealing baffle 13 on the left side descends to the closed state.

[0040] To accelerate the cooling rate of the battery body 1 and enable it to quickly proceed to the next process, the heterojunction battery coating device provided in this embodiment further includes a cooling box body 14. The cooling box body 14 is located downstream of the enclosed assembly along the conveyor belt body 9. The cooling box body 14 is movably coupled with the conveyor belt body 9, and a cooling fan serving as a cooling component 16 is installed inside the cooling box body 14. Cooling baffles 15 are installed on both sides of the cooling box body 14 along the conveyor belt body 9, and the cooling baffles 15 slide in conjunction with the upper and lower sliding rails on the cooling box body 14. As the conveyor belt 9 moves the battery body 1 from right to left and approaches the cooling box body 14, the cooling baffle 15 on the right side rises, opening the cooling box body 14. After the battery body 1 enters the cooling box body 14, the cooling baffle 15 on the right side descends, closing the cooling box body 14. The cooling fan 16, acting as the cooling component, starts blowing cold air toward the battery body 1, causing the battery body 1 to cool down quickly. After cooling is complete, the cooling baffle 15 on the left side rises, and the conveyor belt 9 moves the battery body 1 out of the cooling box body 14, entering the next process.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A heterojunction battery coating device, characterized in that, include: A closed assembly with a coating station at its bottom, the coating station being suitable for installing the battery body (1); A heating component (2) is installed inside the enclosed component, and the heating component (2) is adapted to heat the side of the battery body (1) away from the coating station; A scraper assembly is slidably mounted in the enclosed assembly in a horizontal direction, and the scraper assembly extends toward the coating station.

2. The heterojunction battery coating apparatus according to claim 1, characterized in that, The scraper assembly includes a telescopic member (3) and a scraper body (4) installed at one end of the telescopic member (3). The telescopic member (3) is slidably installed in the enclosed assembly in the horizontal direction.

3. The heterojunction battery coating apparatus according to claim 2, characterized in that, A sliding rail (5) is horizontally installed inside the enclosed assembly, and the end of the telescopic member (3) facing away from the scraper body (4) is slidably engaged with the sliding rail (5).

4. The heterojunction battery coating apparatus according to any one of claims 1 to 3, characterized in that, A heating base plate (6) is installed below the coating station, and the heating base plate (6) is adapted to heat the side of the battery body (1) facing the coating station.

5. The heterojunction battery coating apparatus according to any one of claims 1 to 3, characterized in that, The heating assembly (2) includes a plurality of hot air blowers, which are spaced apart on the top of the enclosed assembly.

6. The heterojunction battery coating apparatus according to any one of claims 1 to 3, characterized in that, A screen printing stencil (7) is also provided between the scraper assembly and the coating station, and the screen printing stencil (7) is slidably installed in the closed assembly in the vertical direction.

7. The heterojunction battery coating apparatus according to claim 6, characterized in that, The screen printing stencil (7) has an auxiliary heating element (8) built in.

8. The heterojunction battery coating apparatus according to any one of claims 1 to 3, characterized in that, It also includes a conveyor belt body (9), a drive rotating component (10) and an auxiliary rotating component (11). The conveyor belt body (9) is wound in a ring between the drive rotating component (10) and the auxiliary rotating component (11). The drive rotating component (10) is used to drive the conveyor belt body (9) to rotate cyclically. The scraping station is located on the conveyor belt body (9). The sealing component is in movable cooperation with the conveyor belt body (9). The enclosure assembly includes an enclosure box body (12) and a pair of enclosure baffles (13), the pair of enclosure baffles (13) being respectively installed on both sides of the enclosure box body (12) along the conveying direction of the conveyor belt body (9); The enclosing baffle (13) has an open state that moves to open the enclosing box body (12) to facilitate entry and exit of the coating station, and a closed state that moves to cooperate with the conveyor belt body (9) to completely close the enclosing box body (12).

9. The heterojunction battery coating apparatus according to claim 8, characterized in that, It also includes a cooling box body (14), which is located downstream of the enclosure assembly along the conveying direction of the conveyor belt body (9). The cooling box body (14) is movably coupled with the conveyor belt body (9), and a cooling component (16) is installed inside the cooling box body (14).

10. The heterojunction battery coating apparatus according to claim 9, characterized in that, Cooling baffles (15) are installed on both sides of the cooling box body (14) along the conveying direction of the conveyor belt body (9), and the cooling baffles (15) slide with the cooling box body (14).

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