Sintering furnace device with uniform and optimized thermal field for producing crystalline silicon solar cell

Abstract

A sintering furnace device with a uniform and optimized thermal field for crystalline silicon solar cell production relates to the field of crystalline silicon solar cell processing and comprises a furnace body assembly, a transmission mechanism and a heating mechanism are arranged in the furnace body assembly, the transmission mechanism is used for transmitting photovoltaic cell panels and comprises a transmission furnace belt, and the transmission furnace belt is provided with a heating device. Thimbles for supporting the photovoltaic cell panel are arranged on the transmission furnace belt; the heating mechanism comprises a heating base assembly and a heating wire assembly, the heating wire assembly comprises a first heating wire and a second heating wire which are arranged on the inner side of the lamp tube, the second heating wire is arranged in the center of the lamp tube, the first heating wire is arranged on the two sides of the second heating wire, and the power of the first heating wire is larger than that of the second heating wire. By optimizing the heating power of different places on the inner side of the lamp tube, the influence of calorimetric heat brought by a furnace belt in the sintering process is improved, so that the whole battery piece is uniformly heated in the sintering process, a sintering furnace process window is enlarged, poor sintering is reduced, and the battery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crystal silicon solar cell processing, and particularly relates to a sintering furnace device with uniform and optimized thermal field for crystal silicon solar cell production. BACKGROUND

[0002] The sintering process is an important technology in the production process of the crystal silicon solar cell, and the sintering process functions to form a good ohmic contact between the paste and the cell sheet through high temperature, and to activate H atoms in the silicon nitride passivation film through high temperature to combine with defects in the cell sheet, so that a good passivation effect is finally achieved and the conversion efficiency of the solar cell is improved. In order to achieve a good sintering effect and make the cell sheet uniformly heated everywhere, a stable and uniform temperature field in dynamic balance needs to be achieved in the sintering furnace.

[0003] At present, in the sintering process of the cell sheet, most of the sintering furnace belts are outside the furnace cavity of the sintering furnace, the temperature in the sintering area in the furnace cavity is as high as about 870 DEG C, and the temperature outside the furnace cavity is about 25 DEG C. The temperature difference between the inside and outside of the furnace cavity is huge. The rotation speed of the sintering furnace belt reaches more than 15 meters per minute. The sintering furnace belt cannot be heated in time due to high-speed rotation, and a part of heat is taken away near the sintering furnace belt. In addition, the sintering furnace belt is provided with a top pin on both sides, so that more heat is taken away on both sides of the sintering furnace belt, resulting in that the temperature on both sides of the sintering furnace cavity is lower than the middle. In the sintering process of the cell sheet, the temperature on both sides of the furnace cavity is low, and top pin marks and black edges are prone to occur on both sides. A good ohmic contact is not formed on both sides of the furnace cavity, and sintering failure occurs. The place where a good ohmic contact is not formed has a large series resistance, and a recombination center is formed, thereby affecting the open circuit voltage and series resistance of the cell sheet. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, the present application aims to provide a sintering furnace device with uniform and optimized thermal field for crystal silicon solar cell production, so that the whole cell sheet is uniformly heated in the sintering process, the process window of the sintering furnace is increased, and sintering failure and cell efficiency are reduced.

[0006] To achieve the above-mentioned purpose, the present application provides a sintering furnace device with uniform and optimized thermal field for crystal silicon solar cell production, which comprises a furnace body assembly, a transmission mechanism and a heating mechanism are arranged in the furnace body assembly, wherein the transmission mechanism is used for conveying a photovoltaic cell panel, the transmission mechanism comprises a transmission furnace belt, the transmission furnace belt is arranged in the interior of the furnace body assembly, and a top pin for supporting the photovoltaic cell panel is arranged on the transmission furnace belt.

[0007] The heating mechanism is used for heating and sintering the surface of the photovoltaic cell panel, and comprises a heating seat assembly and a heating wire assembly, wherein the heating wire assembly is arranged inside the heating seat assembly, the heating seat assembly is arranged outside the transmission furnace belt, the heating seat assembly comprises an insulating seat and a lamp tube, the insulating seat is arranged inside the furnace body assembly, the lamp tube is arranged inside the insulating seat, the heating wire assembly comprises a first heating wire and a second heating wire arranged inside the lamp tube, and the second heating wire is arranged at the center position of the lamp tube, and the first heating wire is arranged on both sides of the second heating wire.

[0008] Further, the inner wall of the insulating seat is provided with an arc-shaped reflecting plate for refracting the light energy and heat energy generated by the heating wire assembly, the light exit port of the insulating seat is provided with a projection glass cover, the edge portion of the projection glass cover is provided with a light guide plate assembly, the light guide plate assembly is arranged towards the transmission furnace belt, and the light guide plate assembly is used for concentrating and projecting the light energy and heat energy refracted by the arc-shaped reflecting plate onto the photovoltaic cell panel.

[0009] Further, the two ends of the insulating seat are provided with an adjusting seat assembly, the inner wall of the furnace body assembly is provided with a heating distance adjusting assembly for adjusting the heating distance between the insulating seat and the photovoltaic cell panel, and the adjusting seat assembly comprises a heating end seat arranged at the two ends of the insulating seat.

[0010] Further, the heating distance adjusting assembly comprises an adjusting groove, an adjusting wire seat and an adjusting wire rod, the adjusting groove is arranged on the inner wall of the furnace body assembly, the adjusting wire seat is arranged on the heating end seat, the adjusting wire rod is rotatably arranged inside the adjusting groove, the adjusting wire rod is threaded through the adjusting wire seat, and one end of the adjusting wire rod is provided with a wire rod motor for driving the rotation of the adjusting wire rod.

[0011] Further, the heating end seat is connected with the end portion of the lamp tube through the insulating seat, one side of the heating end seat close to the lamp tube is provided with an electric socket for plug-in connection with the end portion of the heating wire assembly, the heating end seat is provided with a conductive sliding rod, the conductive sliding rod is electrically connected with the electric socket, the inner wall of the adjusting groove is provided with a conductive sheet, and the conductive sheet is in elastic electrical contact with the conductive sliding rod.

[0012] Further, the light guide plate assembly comprises a telescopic light guide plate, one end of the light guide plate is hingedly connected with the edge portion of the projection glass cover, the outer side of the transmission furnace belt is provided with a light guide plate support seat, and the other end of the light guide plate is hingedly connected with the light guide plate support seat.

[0013] Further, the heating seat assembly is provided with two, and the two heating seat assemblies are arranged in an upper-lower symmetrical manner for heating the two surfaces of the photovoltaic cell panel.

[0014] Further, the furnace body assembly comprises a furnace wall and a furnace body, wherein the furnace body is arranged on the inner side of the furnace wall, both ends of the furnace body assembly are provided with a charging port, and the top of the furnace body assembly is provided with an air outlet window.

[0015] Further, the transmission furnace belt is made of metal mesh material, and the inner side of the transmission furnace belt is provided with a driving roller, and one end of the driving roller is provided with a driving motor for driving the rotation of the driving roller.

[0016] Beneficial effects: the present application optimizes the heating power of different places in the heating seat, the first heating wire is arranged at both ends of the lamp tube, and the second heating wire is arranged in the middle, so as to compensate for the insufficient heat on both sides of the battery piece, make the battery piece heat evenly everywhere, and the sintering furnace needs to reach a stable and uniform temperature field of dynamic balance, improve the influence of heat carried away by the furnace belt in the sintering process, make the whole battery piece heat evenly in the sintering process, increase the process window of the sintering furnace, and at the same time, reduce the sintering defect and improve the battery efficiency.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 Structure diagram of the sintering furnace device for optimizing the thermal field of the crystal silicon solar cell production according to an embodiment of the present application;

[0020] Figure 2 Structure diagram of the heating mechanism in the sintering furnace device for optimizing the thermal field of the crystal silicon solar cell production according to an embodiment of the present application;

[0021] Figure 3 Structure diagram of the heating seat assembly in the sintering furnace device for optimizing the thermal field of the crystal silicon solar cell production according to an embodiment of the present application;

[0022] Figure 4 Right view sectional view of the sintering furnace device for optimizing the thermal field of the crystal silicon solar cell production according to an embodiment of the present application;

[0023] Figure 5 For Figure 4 Enlarged view of A in the middle;

[0024] Figure 6Structure diagram of heating wire assembly in sintering furnace device for optimizing thermal field uniformity for production of crystalline silicon solar cell according to one embodiment of the present application;

[0025] Figure 7 Structure diagram of local structure of heating wire assembly in sintering furnace device for optimizing thermal field uniformity for production of crystalline silicon solar cell according to one embodiment of the present application.

[0026] As shown in the figure: 1, furnace body assembly; 11, furnace wall; 12, furnace body; 2, material port; 3, heating mechanism; 31, heating spacing adjustment assembly; 311, adjustment screw rod; 312, adjustment wire seat; 313, adjustment groove; 314, screw rod motor; 315, conductive sheet; 32, heating seat assembly; 321, heat insulation seat; 322, arc-shaped reflector; 323, arc-shaped glass seat; 324, lamp tube seat; 325, projection glass cover; 33, lamp tube; 34, light guide plate assembly; 341, light guide plate; 342, light guide plate support seat; 35, heating wire assembly; 351, first heating wire; 352, second heating wire; 36, adjustment seat assembly; 361, conductive slide rod; 362, heating end seat; 363, electrical socket; 4, conveying mechanism; 41, conveying furnace belt; 42, driving motor; 43, ejector pin; 44, driving roller; 5, photovoltaic cell panel; 6, air outlet window. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0028] The sintering furnace device for optimizing thermal field uniformity for production of crystalline silicon solar cell according to the embodiments of the present application is described below in combination with the drawings.

[0029] As Figures 1-4 shown, the sintering furnace device for optimizing thermal field uniformity for production of crystalline silicon solar cell according to the embodiments of the present application comprises a furnace body assembly 1, and the furnace body assembly 1 is internally provided with a conveying mechanism 4 and a heating mechanism 3, wherein the conveying mechanism 4 is used for conveying a photovoltaic cell panel 5, and the conveying mechanism 4 comprises a conveying furnace belt 41, the inner side of the conveying furnace belt 41 is provided with a driving roller 44, one end of the driving roller 44 is provided with a driving motor 42 for driving the driving roller 44 to rotate, the conveying furnace belt 41 is arranged in the interior of the furnace body assembly 1, and the conveying furnace belt 41 is provided with an ejector pin 43 for supporting the photovoltaic cell panel 5.

[0030] The heating mechanism 3 is used for heating and sintering the surface of the photovoltaic cell panel 5, and the heating mechanism 3 comprises a heating seat assembly 32 and a heating wire assembly 35, wherein the heating wire assembly 35 is arranged inside the heating seat assembly 32, the heating seat assembly 32 is arranged outside the transmission furnace belt 41, and the heating seat assembly 32 comprises a heat insulation seat 321 and a lamp tube 33, wherein the heat insulation seat 321 is arranged inside the furnace body assembly 1, and the lamp tube 33 is installed on the inside of the heat insulation seat 321 through a lamp tube seat 324.

[0031] The heating wire assembly 35 comprises a first heating wire 351 and a second heating wire 352 arranged inside the lamp tube 33, wherein the second heating wire 352 is arranged at the center position of the lamp tube 33, and the first heating wire 351 is arranged on both sides of the second heating wire 352.

[0032] Specifically, in the process of sintering the surface of the photovoltaic cell panel 5, the photovoltaic cell panel 5 is first fed into the inside of the furnace body assembly 1 from the material port 2, the photovoltaic cell panel 5 is fixed on the ejector pin 43 on the transmission furnace belt 41, and the driving roller 44 is driven to rotate by the driving motor 42, then the driving roller 44 drives the transmission furnace belt 41 to rotate, and the photovoltaic cell panel 5 is continuously transmitted to the right through the transmission furnace belt 41.

[0033] With the continuous transmission of the transmission furnace belt 41 to the right, the photovoltaic cell panel 5 first enters the heating mechanism 3, and the heating wire assembly 35 in the lamp tube 33 is electrified and heated, and the heat is projected onto the photovoltaic cell panel 5 through the lamp tube 33, at the same time, the heat generated by the heating wire assembly 35 is also reflected onto the photovoltaic cell panel 5 through the heat insulation seat 321, reducing heat loss.

[0034] Through the optimized structure of the lamp tube 33, the heating power of different places inside the lamp tube 33, the first heating wire 351 is arranged at both ends of the lamp tube 33, and the second heating wire 352 is arranged in the middle of the lamp tube 33, and the heat on both sides of the lamp tube 33 is slightly higher than that in the middle during the heating process, which compensates for the insufficient temperature near the inner wall of the furnace body assembly 1, improves the influence of the transmission furnace belt 41 on the heat removal in the sintering process, and compensates for the insufficient heat on both sides of the photovoltaic cell panel 5, so as to achieve a stable and uniform temperature field in the sintering furnace, and make the photovoltaic cell panel 5 heated uniformly everywhere, so that the whole photovoltaic cell panel 5 is heated uniformly in the sintering process, increases the process window of the sintering furnace, and reduces sintering defects and improves cell efficiency.

[0035] In an embodiment of the present application, as Figure 3As shown, the inner wall of the heat insulation seat 321 is provided with an arc-shaped reflecting plate 322, which is used to refract the light energy and heat energy generated by the heating wire assembly 35. The inner side of the arc-shaped reflecting plate 322 is provided with an arc-shaped glass seat 323, which is used to protect the arc-shaped reflecting plate 322. The light exit of the heat insulation seat 321 is provided with a projection glass cover 325. The edge portion of the projection glass cover 325 is provided with a light guide plate assembly 34, which faces the transmission furnace belt 41. The light guide plate assembly 34 is used to concentrate and project the light energy and heat energy refracted by the arc-shaped reflecting plate 322 onto the photovoltaic cell panel 5.

[0036] Specifically, during the heating process of the heating wire assembly 35 inside the lamp tube 33, part of the light and heat is directly projected onto the photovoltaic cell panel 5 through the projection glass cover 325, and part of the light and heat is projected onto the arc-shaped reflecting plate 322 through the lamp tube 33. The arc-shaped reflecting plate 322 refracts the light energy and heat energy, and finally projects the light and heat onto the photovoltaic cell panel 5, thereby improving the utilization rate of heat. At the same time, the heat insulation seat 321 isolates the heat on the arc-shaped reflecting plate 322, reducing heat loss. The light guide plate assembly 34 further constrains the scattered light and heat, so that the energy is maximally transferred to the photovoltaic cell panel 5.

[0037] In one embodiment of the present application, as shown in Figures 2-5 The two ends of the heat insulation seat 321 are provided with an adjusting seat assembly 36, and the inner wall of the furnace body assembly 1 is provided with a heating distance adjusting assembly 31. The heating distance adjusting assembly 31 is used to adjust the heating distance between the heat insulation seat 321 and the photovoltaic cell panel 5. The adjusting seat assembly 36 includes a heating end seat 362, which is arranged at the two ends of the heat insulation seat 321.

[0038] The heating distance adjusting assembly 31 includes an adjusting groove 313, an adjusting wire seat 312 and an adjusting wire rod 311. The adjusting groove 313 is opened on the inner wall of the furnace body assembly 1. The adjusting wire seat 312 is arranged on the heating end seat 362. The adjusting wire rod 311 is rotationally arranged inside the adjusting groove 313. The adjusting wire rod 311 is threaded through the adjusting wire seat 312. One end of the adjusting wire rod 311 is provided with a wire rod motor 314 for driving the rotation thereof.

[0039] Specifically, during the preheating stage of the furnace body assembly 1, the wire rod motor 314 drives the rotation of the adjusting wire rod 311. The adjusting wire rod 311 is threadedly engaged with the adjusting wire seat 312 to drive the heating end seat 362 away from the photovoltaic cell panel 5. In this way, the irradiation distance of the lamp tube 33 is longer, so that the interior of the furnace body assembly 1 and the surface of the photovoltaic cell panel 5 are quickly and fully preheated.

[0040] When it is needed to heat the surface of the photovoltaic panel 5 uniformly, the adjusting screw rod 311 is driven to rotate reversely by the screw rod motor 314, the adjusting screw rod 311 and the adjusting screw seat 312 are threadedly engaged to drive the heating end seat 362 to approach the photovoltaic panel 5, the lamp tube 33 approaches the photovoltaic panel 5, the distance between the lamp tube 33 and the photovoltaic panel 5 is adjusted, the lamp tube 33 can flexibly and accurately adjust the temperature on both sides of the photovoltaic panel 5, the surface of the photovoltaic panel 5 is heated by the unevenly distributed heating wire assembly 35 in the inside of the lamp tube 33, the heat on both sides of the lamp tube 33 is slightly higher than the heat in the middle during the heating process, the insufficient heating temperature on both sides of the photovoltaic panel 5 is compensated, and the temperature field on both sides and in the middle of the photovoltaic panel 5 is kept consistent during the movement of the photovoltaic panel 5 along the transmission furnace belt 41.

[0041] In an embodiment of the present application, as shown in Figure 5 The heating end seat 362 is connected with the end of the lamp tube 33 through the heat insulation seat 321, an electric socket 363 is arranged on the side of the heating end seat 362 close to the lamp tube 33, the electric socket 363 is used for plugging with the end of the heating wire assembly 35, the conductive slide rod 361 is arranged through the heating end seat 362, the conductive slide rod 361 is electrically connected with the electric socket 363, and the conductive sheet 315 is arranged on the inner wall of the adjusting groove 313 and elastically electrically contacts with the conductive slide rod 361.

[0042] Specifically, during the up-and-down movement of the heat insulation seat 321 and the lamp tube 33, the heating end seat 362 moves up and down along the adjusting groove 313, at this time, the conductive slide rod 361 in the inside of the heating end seat 362 is always in electric contact with the conductive sheet 315 in the inside of the adjusting groove 313, so that the heating wire assembly 35 in the inside of the lamp tube 33 can be always powered on during the up-and-down movement of the lamp tube 33.

[0043] In an embodiment of the present application, as shown in Figure 3 The light guide plate assembly 34 comprises a telescopic light guide plate 341, one end of the light guide plate 341 is hinged with the edge portion of the projection glass cover 325, the outside of the transmission furnace belt 41 is provided with a light guide plate support seat 342, and the other end of the light guide plate 341 is hinged with the light guide plate support seat 342.

[0044] Specifically, during the up-and-down movement of the lamp tube 33, the two sides of the light guide plate 341 are always supported by the light guide plate support seat 342, so that the lamp tube 33 and the light guide plate 341 are both kept a safe distance from the photovoltaic panel 5, the photovoltaic panel 5 is smoothly transmitted along the transmission furnace belt 41, and the light and heat generated by the lamp tube 33 can be always reflected to the surface of the photovoltaic panel 5 during the up-and-down movement of the light guide plate 341, thereby improving the utilization rate of heat.

[0045] In an embodiment of the present application, as shown in Figure 2As shown, the heating seat assembly 32 is provided with two, two heating seat assembly 32 is symmetrically arranged, for the two sides of the photovoltaic cell panel 5 heating.

[0046] In one embodiment of the present application, as Figure 1 As shown, the furnace body assembly 1 includes a furnace wall 11 and a furnace 12, wherein the furnace 12 is arranged on the inner side of the furnace wall 11, which plays a role in heat preservation, both ends of the furnace body assembly 1 are provided with a material port 2, for the photovoltaic cell panel 5 in and out of material, the top of the furnace body assembly 1 is provided with an air outlet window 6, for the exhaust gas generated during the sintering process of the photovoltaic cell panel 5.

[0047] In order to clearly illustrate the above-mentioned embodiments, with reference to Figures 1-7 The working principle of the sintering furnace device for optimizing the uniformity of the thermal field of the production of crystalline silicon solar cells of the present application is as follows:

[0048] When sintering the surface of the photovoltaic cell panel 5, first feed the photovoltaic cell panel 5 from the material port 2 into the inside of the furnace body assembly 1, and fix the photovoltaic cell panel 5 on the top pin 43 on the transmission furnace belt 41, then power on the drive motor 42, drive the drive roller 44 to rotate through the drive motor 42, then the drive roller 44 drives the transmission furnace belt 41 to rotate, the transmission furnace belt 41 continuously transmits the photovoltaic cell panel 5 to the right, because the transmission furnace belt 41 is a metal mesh material, heat can easily pass through the transmission furnace belt 41 and project onto the surface of the photovoltaic cell panel 5.

[0049] As the transmission furnace belt 41 continuously transmits to the right, the photovoltaic cell panel 5 first enters the heating mechanism 3, in this process, the conductive sheet 315 inside the left and right two adjusting grooves 313 is powered on, the heating wire assembly 35 at both ends of the lamp tube 33 is in electrical contact with the conductive sheet 315 through the conductive slide rod 361, the heating wire assembly 35 is powered on and heated, the heat is projected onto the photovoltaic cell panel 5 through the lamp tube 33, a part of the heat is projected onto the heat insulation seat 321, and is refracted again to the surface of the photovoltaic cell panel 5 through the arc-shaped reflector 322, reducing energy waste.

[0050] In the process of continuously transmitting the photovoltaic cell panel 5 to the right, because the temperature near the inner wall of the furnace body assembly 1 is low, and the temperature in the middle position is high, at this time, through the optimized heating wire assembly 35, by setting the first heating wire 351 at both ends of the lamp tube 33 and the second heating wire 352 in the middle, the rated power of the first heating wire 351 is greater than that of the second heating wire 352, the heat on both sides of the lamp tube 33 is slightly higher than that in the middle during heating, to compensate for the insufficient heat near the inner wall of the furnace body assembly 1, and to improve the insufficient heat on both sides of the photovoltaic cell panel 5, so that the sintering furnace needs to reach a stable and uniform temperature field of dynamic balance, and the photovoltaic cell panel 5 is heated uniformly everywhere.

[0051] In addition, in the initial preheating stage of the furnace assembly 1, the heat insulation seat 321 and the lamp tube 33 are driven away from the photovoltaic cell panel 5 by rotating the adjusting screw rod 311 driven by the screw rod motor 314, so that the irradiation distance of the lamp tube 33 is longer, and the inside of the furnace assembly 1 and the surface of the photovoltaic cell panel 5 are fully preheated.

[0052] When the preheating is completed, the heat on both sides of the photovoltaic cell panel 5 needs to be compensated to heat the uniform temperature field on the surface of the photovoltaic cell panel 5, the adjusting screw rod 311 is reversely rotated by the screw rod motor 314 to drive the lamp tube 33 to approach the photovoltaic cell panel 5, and the lamp tube 33 is adjusted to the appropriate distance from the photovoltaic cell panel 5, so that the lamp tube 33 can more flexibly and accurately adjust the temperature on both sides of the photovoltaic cell panel 5, and the temperature field on both sides and the middle position of the photovoltaic cell panel 5 during the walking process along the transmission furnace belt 41 is kept consistent. Finally, the sintered photovoltaic cell panel 5 is discharged from the material port 2 at the other end of the furnace assembly 1.

[0053] In summary, the sintering furnace device for the production of the crystalline silicon solar cell with uniform and optimized heat field of the embodiment of the application can optimize the heating power of different places inside the lamp tube, the first heating wire is arranged at both ends of the lamp tube, and the second heating wire is arranged in the middle. Since the rated power of the first heating wire is greater than that of the second heating wire, the heat on both sides of the cell piece is compensated, the heat on each place of the cell piece is uniformly heated, the stable and uniform temperature field in the sintering furnace needs to reach dynamic balance, the influence of the heat carried away by the furnace belt during sintering is improved, the entire cell piece is uniformly heated during sintering, the process window of the sintering furnace is increased, and the sintering defects are reduced and the cell efficiency is improved.

[0054] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and deformations to the above embodiments within the scope of the application.

Claims

1. A sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity, characterized by, The application relates to a furnace body assembly (1) internally provided with a transmission mechanism (4) and a heating mechanism (3), wherein the transmission mechanism (4) is used for transmitting a photovoltaic cell panel (5), the transmission mechanism (4) comprises a transmission furnace belt (41) arranged in the interior of the furnace body assembly (1), and a thimble (43) for supporting the photovoltaic cell panel (5) is arranged on the transmission furnace belt (41); the heating mechanism (3) is used for heating and sintering the surface of the photovoltaic cell panel (5), and the heating mechanism (3) comprises a heating seat assembly (32) and a heating wire assembly (35), wherein the heating wire assembly (35) is arranged on the inner side of the heating seat assembly (32), and the heating seat assembly (32) is arranged on the outer side of the transmission furnace belt (41); the heating seat assembly (32) comprises a heat insulation seat (321) and a lamp tube (33), wherein the heat insulation seat (321) is arranged in the interior of the furnace body assembly (1), and the lamp tube (33) is arranged on the inner side of the heat insulation seat (321); the heating wire assembly (35) comprises a first heating wire (351) and a second heating wire (352) arranged on the inner side of the lamp tube (33), wherein the second heating wire (352) is arranged at the center position of the lamp tube (33), the first heating wire (351) is arranged on the two sides of the second heating wire (352), and the rated power of the first heating wire (351) is greater than that of the second heating wire (352). The inner wall of the heat insulation seat (321) is provided with an arc-shaped reflecting plate (322) used for refracting light energy and heat energy generated by the heating wire assembly (35), the light exit of the heat insulation seat (321) is provided with a projection glass cover (325), the edge portion of the projection glass cover (325) is provided with a light guide plate assembly (34) facing the transmission furnace belt (41), and the light guide plate assembly (34) is used for concentrating and projecting the light energy and heat energy refracted by the arc-shaped reflecting plate (322) onto the photovoltaic cell panel (5). Both ends of the heat insulation seat (321) are provided with an adjusting seat assembly (36), and the inner wall of the furnace body assembly (1) is provided with a heating distance adjusting assembly (31) used for adjusting the heating distance between the heat insulation seat (321) and the photovoltaic cell panel (5); the adjusting seat assembly (36) comprises a heating end seat (362) arranged at both ends of the heat insulation seat (321). ​ 2. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity, according to claim 1, characterized in that, ​ 3. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity, according to claim 2, characterized in that, ​ ​ 4. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 3, characterized in that The heating distance adjusting assembly (31) comprises an adjusting groove (313), an adjusting wire seat (312) and an adjusting wire rod (311), wherein the adjusting groove (313) is arranged on the inner wall of the furnace body assembly (1), the adjusting wire seat (312) is arranged on the heating end seat (362), the adjusting wire rod (311) is rotatably arranged in the adjusting groove (313), the adjusting wire rod (311) is threaded through the adjusting wire seat (312), and one end of the adjusting wire rod (311) is provided with a wire rod motor (314) for driving the rotation of the adjusting wire rod (311).

5. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 4, characterized in that, The heating end seat (362) is connected with the end of the lamp tube (33) through the heat insulation seat (321), one side of the heating end seat (362) close to the lamp tube (33) is provided with an electric socket (363), the electric socket (363) is used for being plugged with the end of the heating wire assembly (35), and the heating end seat (362) is provided with a conductive sliding rod (361) penetrating through the heating end seat (362), and the conductive sliding rod (361) is electrically connected with the electric socket (363). The inner wall of the adjusting groove (313) is provided with a conductive sheet (315), and the conductive sheet (315) is in elastic electrical contact with the conductive sliding rod (361).

6. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 3, characterized in that, The light guide plate assembly (34) comprises a telescopic light guide plate (341), one end of the light guide plate (341) is hingedly connected with the edge portion of the projection glass cover (325), the outer side of the transmission furnace belt (41) is provided with a light guide plate (341) support seat, and the other end of the light guide plate (341) is hingedly connected with the light guide plate (341) support seat.

7. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 1, characterized in that, The heating seat assembly (32) is provided with two heating seat assemblies (32) arranged symmetrically in up and down directions, and is used for heating two surfaces of the photovoltaic cell panel (5).

8. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 1, characterized in that, The furnace body assembly (1) comprises a furnace wall (11) and a furnace body (12), wherein the furnace body (12) is arranged on the inner side of the furnace wall (11), both ends of the furnace body assembly (1) are provided with a charging port (2), and the top of the furnace body assembly (1) is provided with an air outlet window (6).

9. The sintering furnace device for the production of crystalline silicon solar cells with optimized thermal field homogeneity according to claim 1, characterized in that, The transmission furnace belt (41) is made of metal mesh material, and the inner side of the transmission furnace belt (41) is provided with a driving roller (44), one end of the driving roller (44) is provided with a driving motor (42) for driving the rotation of the driving roller (44).

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