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CN-224221797-U - Coating apparatus

CN224221797UCN 224221797 UCN224221797 UCN 224221797UCN-224221797-U

Abstract

The application discloses a coating device. The coating device comprises a die head, the die head comprises at least two flow channels, each flow channel is provided with holes at the coating end of the die head to form openings, each opening is formed into a slit shape and is arranged along the coating direction, projections of adjacent openings along the coating direction in the coating direction are at least partially overlapped, and the coating direction is the moving direction of the die head relative to the substrate under the condition of coating. The probability of contact between the easily oxidized sizing agent extruded by the coating equipment and air is low, so that the stability of the prepared functional layer is improved. The coating equipment provided by the embodiment of the application is applied to the preparation of the perovskite solar cell, and can improve the photoelectric conversion efficiency and stability of the perovskite solar cell.

Inventors

  • RAO HUAN
  • LI YUELONG
  • CHEN CHANGSONG
  • CHEN LINFENG
  • ZHU CHEN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250408

Claims (19)

  1. 1. A coating apparatus for forming a functional layer on a surface of a substrate, comprising: A die comprising at least two flow channels, each of the flow channels opening at a coating end of the die to form openings, each of the openings being formed in a slit shape and arranged in a coating direction, projections of adjacent openings in the coating direction being at least partially coincident in the coating direction, the coating direction being a direction of movement of the die relative to the substrate in the case of coating.
  2. 2. The coating apparatus of claim 1, wherein the at least two flow channels comprise a first flow channel and a second flow channel; the first flow channel is opened at the coating end of the die head to form a first opening, the second flow channel is opened at the coating end of the die head to form a second opening, the first opening and the second opening are arranged along the coating direction, and the second opening is positioned in front of at least part of the first opening along the coating direction.
  3. 3. The coating apparatus according to claim 2, wherein a projection of the second opening in the coating direction falls within a range of a projection of the first opening in the coating direction.
  4. 4. A coating apparatus according to claim 2 or 3, characterized in that the minimum distance between the end of the projection of the second opening in the coating direction and the end of the projection of the first opening in the coating direction is 0mm to 10mm.
  5. 5. The coating apparatus according to any one of claims 2 to 4, wherein the second opening extends in a first direction that coincides with a length direction of the second opening and is perpendicular to the coating direction.
  6. 6. Coating apparatus according to any one of claims 2 to 5, wherein the second opening is located in front of the entirety of the first opening in the coating direction.
  7. 7. The coating apparatus according to any one of claims 2 to 6, wherein the first opening extends in a first direction that coincides with a length direction of the first opening and is perpendicular to the coating direction.
  8. 8. Coating apparatus according to any one of claims 2 to 5, wherein the first opening comprises a first section; A second section disposed opposite the first section; A third section extending along a first direction, wherein the first direction is consistent with the length direction of the third section and is perpendicular to the coating direction, and the first section and the second section are respectively connected to two end parts of the third section and are communicated with the third section; The second opening is located at least in front of the third section in the coating direction.
  9. 9. Coating apparatus according to any one of claims 2 to 5, wherein the first opening is configured as a ring-shaped opening, which surrounds the second opening.
  10. 10. The coating apparatus according to any one of claims 2 to 9, further comprising: A first slurry supply in communication with the first flow path for providing an oxidation resistant slurry to the first flow path; And a second slurry supply device in communication with the second flow path for providing an oxidizable slurry to the second flow path.
  11. 11. The coating apparatus of any one of claims 2 to 8, wherein the at least two flow channels further comprise a third flow channel, the third flow channel being open at the coating end of the die to form a third opening, The third opening is arranged on one side of the second opening away from the first opening along the coating direction.
  12. 12. The coating apparatus of claim 11, further comprising: A first slurry supply in communication with the first flow path for providing an oxidation resistant slurry to the first flow path; a second slurry supply in communication with the second flow path for providing an oxidizable slurry to the second flow path; And the medium supply device is communicated with the third flow passage and is used for supplying any one of oxidation-resistant slurry, oxidation-resistant gas and passivation slurry to the third flow passage.
  13. 13. The coating apparatus according to claim 11 or 12, wherein the third opening extends in a first direction, the first direction being coincident with a length direction of the third opening and perpendicular to the coating direction.
  14. 14. Coating apparatus according to any one of claims 11 to 13, characterized in that the projection of the second opening in the coating direction falls within the projection of the third opening in the coating direction.
  15. 15. The coating apparatus according to any one of claims 11 to 14, wherein a minimum distance between an end of the projection of the second opening in the coating direction and an end of the projection of the third opening in the coating direction is 0mm to 10mm.
  16. 16. The coating apparatus according to any one of claims 2 to 15, wherein a width of the second opening in the coating direction is larger than a width of the first opening in the coating direction.
  17. 17. The coating apparatus according to any one of claims 2 to 16, wherein a width of the second opening in the coating direction is 0.04mm to 1.5mm.
  18. 18. The coating apparatus according to any one of claims 1 to 17, further comprising a transmission member; the transmission part is used for driving the base material to move.
  19. 19. A coating apparatus according to claim 10 or 12, wherein the second slurry supply means is for providing tin-lead perovskite material to the second flow path.

Description

Coating apparatus Technical Field The application relates to the technical field of battery manufacturing, in particular to coating equipment used in a battery manufacturing process. Background In recent years, solar cells have received increasing attention as an ideal renewable energy source. Solar cells, also known as photovoltaic cells, are devices that convert light energy directly into electrical energy by the photoelectric or photochemical effect. Perovskite solar cells are solar cells that utilize perovskite materials as light absorbing materials. Compared with other solar cells, perovskite solar cells are distinguished in the field of solar cells by the advantages of low cost, high efficiency, simple process and the like. In the production of perovskite solar cells, the coating apparatus may be caused to form a functional layer containing a perovskite material (e.g., a tin-lead perovskite material) on a substrate in accordance with the principles of open coating. However, some perovskite materials are readily oxidizable slurries (e.g., tin-lead perovskite materials). The easily oxidized slurry has poor oxygen stability. In the coating process, oxidation reaction occurs when the perovskite material with poor stability contacts with air, so that the photoelectric conversion efficiency and stability of the solar cell are reduced. Therefore, providing a coating apparatus that can reduce the oxidation probability of an easily oxidized slurry in the coating process is a technical problem to be solved. Disclosure of utility model In order to solve the technical problems, the application provides coating equipment which can reduce the oxidation probability of easily oxidized slurry in the coating process, and can be applied to the preparation process of perovskite solar cells to prepare perovskite solar cells with high photoelectric conversion efficiency and stability. The application is realized by the following technical scheme. The application provides a coating device which is used for forming a functional layer on the surface of a substrate, the coating device comprises a die head, the die head comprises at least two flow channels, each flow channel is provided with holes at the coating end of the die head to form openings, the openings are formed into slit shapes and are arranged along the coating direction, projections of adjacent openings along the coating direction in the coating direction are at least partially overlapped, and the coating direction is the moving direction of the die head relative to the substrate under the condition of coating. According to the application, the coating equipment is provided with at least two flow channels, and the coating equipment can respectively utilize different flow channels to transmit the easily-oxidized slurry and the oxidation-resistant slurry, so that the easily-oxidized slurry and the oxidation-resistant slurry are extruded through different openings. Because the projections of the adjacent openings in the coating direction are partially overlapped, when two kinds of slurry are coated on the substrate, the oxidation-resistant slurry can be covered on at least part of the surface of the easily oxidized slurry, so that the easily oxidized slurry can be blocked from being contacted with air, the oxidation of the easily oxidized slurry is reduced, and the stability of the prepared functional layer is improved. The coating equipment provided by the embodiment of the application is applied to the preparation of the perovskite solar cell, and can improve the photoelectric conversion efficiency and stability of the perovskite solar cell. In some embodiments, the at least two runners include a first runner that opens at the coating end of the die to form a first opening and a second runner that opens at the coating end of the die to form a second opening, the first opening and the second opening being aligned along the coating direction and the second opening being located in front of at least a portion of the first opening along the coating direction. By the design, the slurry extruded by the first opening is beneficial to at least covering the upper surface of the slurry extruded by the second opening, so that the probability of contact of the upper surface of the slurry extruded by the second opening with oxygen is reduced, the probability of oxidation of the slurry is reduced, and the stability of the formed functional layer is improved. In some embodiments, the projection of the second opening in the coating direction falls within the projection of the first opening in the coating direction. In this embodiment, the projection relationship of the second opening and the first opening in the coating direction is favorable for the slurry extruded by the first opening to completely cover the upper surface of the slurry extruded by the second opening, so that the contact probability of the upper surface of the slurry extruded by the second opening with oxygen is