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CN-224231389-U - Sample loading system for synchronous thermal analysis of silver paste of photovoltaic cell

CN224231389UCN 224231389 UCN224231389 UCN 224231389UCN-224231389-U

Abstract

The utility model relates to the field of material thermal analysis, in particular to a sample loading system for synchronous thermal analysis of silver paste of a photovoltaic cell, which comprises a baffle module and a blowing-leveling module, wherein the baffle module is of a cylindrical structure with openings at two ends, the baffle module is arranged in a crucible, the silver paste of the photovoltaic cell to be analyzed enters the crucible through the openings at two ends of the baffle module, and the blowing-leveling module levels the silver paste of the photovoltaic cell to be analyzed in the crucible in a blowing mode. According to the utility model, the baffle module is used for realizing that the lateral wall of the crucible is prevented from being accidentally stained when the STA analysis sample loading is carried out on the silver paste of the photovoltaic cell. The blowing-leveling module sprays gas with proper force, so that silver paste is uniformly distributed in the accommodating body and is evenly paved at the bottom of the crucible. And further, the temperature difference of different parts of the sample in the test analysis is reduced, the more accurate thermal reaction temperature is obtained, the consistency of the shape of a thermal analysis curve is improved, and the research of silver paste sintering and the photovoltaic cell preparation process of the photovoltaic cell is effectively supported.

Inventors

  • FU XUETAO
  • ZHANG JUNHUA
  • LIU YU
  • CHEN XIAODA
  • ZHANG LI
  • ZHU CHEN

Assignees

  • 中国电子技术标准化研究院（（工业和信息化部电子工业标准化研究院）（工业和信息化部电子第四研究院））

Dates

Publication Date
20260512
Application Date
20250414

Claims (10)

  1. 1. A sample loading system for synchronous thermal analysis of silver paste of a photovoltaic cell is characterized by comprising a baffle module (1) and a blowing-leveling module (2); The baffle module (1) is of a cylindrical structure with openings at two ends, the baffle module (1) is arranged in the crucible, and silver paste of the photovoltaic cell to be analyzed enters the crucible through the openings at two ends of the baffle module (1); The blowing-out module (2) comprises a gas container unit (210), a gas flow regulating unit (220), a connecting unit (230) and a gas spraying unit (240); the gas container unit (210) is connected with the gas flow regulating unit (220), and the gas flow regulating unit (220) is connected with the gas spraying unit (240) through the connecting unit (230); the gas container unit (210) is used for containing gas to be sprayed; the gas flow regulating unit (220) is used for regulating the pressure of the injected gas; The jet unit (240) jets gas to planarize silver paste of the photovoltaic cell to be analyzed in the crucible.
  2. 2. The sample loading system according to claim 1, wherein, The baffle module (1) is formed by winding aluminum foil; the outer diameter of the baffle module (1) is smaller than the inner diameter of the crucible.
  3. 3. The sample loading system according to claim 2, wherein, The depth of the baffle module (1) is larger than the depth of the crucible.
  4. 4. The sample loading system according to claim 1, wherein, The gas container unit (210) comprises a body (211) and a gas port (212); the body (211) is used for containing gas to be sprayed; The gas port (212) is connected with the body (211) and is used for gas inlet and outlet; The gas port (212) is connected to the gas flow rate adjustment unit (220).
  5. 5. The sample loading system according to claim 4, wherein, The gas flow regulating unit (220) is a pressure reducing valve; One end of the pressure reducing valve is connected with the air port (212), and the other end of the pressure reducing valve is connected with the connecting unit (230).
  6. 6. The sample loading system according to claim 5, wherein, The pressure regulating range of the pressure reducing valve is 0.1-0.5 MPa.
  7. 7. The sample loading system according to claim 5, wherein, The connection unit (230) is a hose; One end of the hose is connected with the pressure reducing valve, and the other end of the hose is connected with the air injection unit.
  8. 8. The sample loading system according to claim 7, wherein, The air injection unit (240) comprises a connection end (241) and a nozzle end (242); The connecting end (241) is connected with the hose, and the nozzle end (242) sprays gas to level silver paste of the photovoltaic cell to be analyzed in the crucible.
  9. 9. The sample loading system according to claim 8, wherein the nozzle end (242) has a circular cross-sectional shape, and the nozzle end (242) has a cross-sectional inner diameter of 1mm or less.
  10. 10. The sample loading system according to claim 8, wherein, The connecting end (241) is detachably connected with the hose.

Description

Sample loading system for synchronous thermal analysis of silver paste of photovoltaic cell Technical Field The utility model relates to the field of material thermal analysis, in particular to a sample loading system for synchronous thermal analysis of silver paste of a photovoltaic cell. Background The photovoltaic solar cell utilizes the photovoltaic effect of the PN junction of the semiconductor to generate photoelectric conversion, and the formed charge is collected by the grid line on the surface of the cell and then transmitted. The silver paste of the photovoltaic cell is a material for preparing a cell grid line, and the quality of the silver paste directly influences the performance and service life of a photovoltaic module. The grid line preparation process is that the silver paste of the photovoltaic cell is coated on the cell by screen printing and then sintered. Therefore, the thermal behavior research based on the silver paste sintering process of the photovoltaic cell becomes an important point for the research of the preparation process of the photovoltaic cell. The technical means for researching the sintering thermal behavior of the silver paste of the photovoltaic cell mainly comprise TG, DSC or a synchronous thermal analysis technology (STA) based on the combination of TG and DSC. Before performing these thermal analyses, the photovoltaic cell silver paste needs to be put into a crucible matched with the instrument. The crucible is generally made of aluminum, alumina and other materials, is cylindrical or in a truncated cone shape, and has an inner diameter of about 5 mm. According to the difference of crucible depth, can be divided into shallow dish crucible and cylindrical crucible. In the test process, the temperature of the sample is obtained by comprehensively treating the temperature of the furnace body and the heat sensor contacted with the crucible. Therefore, the reaction degree of the sample at different parts of the crucible is different. The thickness and heat capacity of the sample can affect the temperature gradient between the crucible wall and the sample. Therefore, in order to obtain more reliable thermal analysis results, the silver paste sample placed in the crucible should be laid flat on the bottom of the crucible as much as possible. However, due to the characteristic of high viscosity of silver paste of a photovoltaic cell, after a proper amount of silver paste is adhered by adopting conventional tools such as a sample spoon, tweezers and the like and put into a crucible, the shape of the silver paste is usually quite irregular and cannot be paved at the bottom of the crucible, and meanwhile, the silver paste is possibly adhered to the side wall of the crucible accidentally due to misoperation, and even part of the silver paste is possibly adhered outside the crucible. When the lofting tool is taken out, the spike appearance of the sample can be caused by the silver paste adhesion lofting tool. This will have a significant impact on the accuracy, reproducibility of the test analysis. Therefore, how to realize that a silver paste sample is spread on the bottom of a crucible and at the same time avoid that the silver paste is accidentally stuck on the side wall of the crucible is one research direction at present. Disclosure of utility model Object of the utility model The utility model aims to provide a sample loading system for synchronous thermal analysis of silver paste of a photovoltaic cell, which can solve the problems that the silver paste cannot be spread on the bottom of a crucible after being loaded into the crucible and has a spike shape when the STA thermal analysis is carried out on the silver paste of the photovoltaic cell. (II) technical scheme In order to solve the problems, the utility model provides a sample loading system for synchronous thermal analysis of silver paste of a photovoltaic cell, which comprises a baffle module and a blowing-out module; The baffle module is arranged in a cylindrical structure with openings at two ends, the baffle module is arranged in the crucible, and the silver paste of the photovoltaic cell to be analyzed enters the crucible through the openings at two ends of the baffle module; The blowing-leveling module comprises a gas container unit, a gas flow regulating unit, a connecting unit and a gas spraying unit; the gas container unit is connected with the gas flow regulating unit; the gas flow regulating unit is connected with the gas injection unit through the connecting unit; the gas container unit is used for containing gas to be sprayed; the gas flow regulating unit is used for regulating the pressure of the injected gas; And the jet unit jets gas to level silver paste of the photovoltaic cell to be analyzed in the crucible. In another aspect of the present utility model, the method, preferably, The baffle module is formed by winding aluminum foil; the outer diameter of the baffle module is smaller than the inner