TOPCon sintering heating structure used in sintering furnace

Abstract

The utility model discloses a TOPCon sintering heating structure used in a sintering furnace, and belongs to the technical field of photovoltaic cell processing. Comprising a TOPCon sintering heating pipe and a positioning assembly, and the positioning assembly is suitable for being connected with a sintering channel; the TOPCon sintering heating pipe comprises a main body part, inclined parts are arranged at the two ends of the main body part, end body parts are arranged at the ends, away from the main body part, of the inclined parts, and connectors are installed at the ends, away from the inclined parts, of the end body parts; the main body part, the inclined part and the end body part are integrally connected; tOPCon sintering heating pipes are mounted on the upper side and the lower side of the conveying structure correspondingly, and the distance between the main body parts of the two corresponding sets of TOPCon sintering heating pipes is larger than the distance between the two end body parts of the two corresponding sets of TOPCon sintering heating pipes. According to the utility model, the technical problem of unstable product qualification rate caused by unstable sintering growth and drying of silicon wafer crystals is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cell processing and relates to a TOPCon sintering heating structure used in a sintering furnace. Background Art

[0002] During the manufacturing process of solar crystalline silicon cells, a sintering process is required, in which the sintering furnace equipment is used to solidify the slurry after printing. In the existing TOPCon process route, the stability of the sintering furnace temperature cannot be guaranteed. The size of the temperature difference is related to the stability of the efficiency. Currently, there is no means to ensure stability in the industry, and it can only be controlled by the time displacement of the furnace temperature and the speed of the furnace belt. This will have side effects on stability assurance, on-site control and cost control.

[0003] Most of the sintering heating lamps in existing references are straight-line, for example:

[0004] Application No. CN202322521389.1 is a silicon crystal cell sintering device and CN201911255808.3 is a sintering furnace with adjustable temperature zone for producing cells. The sintering heating lamps are all linear, which has a good sintering effect for a single small cell. However, for multiple small cells sintered in parallel or a single large cell, there is a problem of substandard sintering at both ends. The difference between the heating temperature at the two ends and the temperature in the middle is large, resulting in unstable stability of the diffusion of organic matter and the drying stability of the solidification during sintering, resulting in unstable product qualification rate.

[0005] In summary, the utility model provides a TOPCon sintering heating structure for use in a sintering furnace. Summary of the invention

[0006] The utility model is helpful to overcome the stability of organic matter diffusion and the stability of curing and drying, especially the control of product efficiency.

[0007] In order to solve the above technical problems, the inventor has obtained the technical solution of the utility model through practice and summary. The utility model discloses that the basic concept of the technical solution adopted by the utility model to solve the above technical problems is:

[0008] A TOPCon sintering heating structure used in a sintering furnace is installed in pairs in the sintering furnace. A sintering channel is provided in the sintering furnace. A conveying structure is installed in the sintering channel. The conveying structure includes a sintering mesh. The sintering mesh is suitable for placing battery cells.

[0009] It includes a TOPCon sintering heating tube and a positioning assembly, wherein the positioning assembly is suitable for connecting with a sintering channel;

[0010] The TOPCon sintered heating tube comprises a main body, oblique parts are arranged at both ends of the main body, an end body is arranged at one end of the oblique part away from the main body, and a connector is installed at one end of the end body away from the oblique part;

[0011] The main body, the oblique portion and the end body are integrally connected;

[0012] TOPCon sintering heating tubes are installed on the upper and lower sides of the conveying structure respectively, and the distance between the main bodies of the two corresponding groups of TOPCon sintering heating tubes is greater than the distance between the two groups of end bodies.

[0013] In a further technical solution, the main body is parallel to the end body, and the main body is arranged parallel to the battery cell;

[0014] The main body, the oblique part and the end body all include a lamp housing and a heating wire and are filled with halogen gas; electrodes are arranged in the two groups of end body parts.

[0015] In a further technical solution, the length of the main body is 6 to 7 times the length of the end body.

[0016] In a further technical solution, transition fillets are provided at both ends of the oblique portion, and the radius of the transition fillets is A, 15mm≤A≤25mm, and the inclination angle between the oblique portion and the main body is 30°~40°.

[0017] In a further technical solution, a positioning member 1 and a positioning member 2 are included, wherein the positioning member 1 includes a vertical shell 1, a movable cavity is provided in the vertical shell 1, a movable plate 1 is installed in the movable cavity, a mounting hole is provided on the movable plate 1, and the mounting hole is connected to the connector;

[0018] The first positioning member and the second positioning member are respectively installed at two ends of the TOPCon sintering heating tube.

[0019] In a further technical solution, the second positioning member includes a second vertical shell, a vertical cavity is provided in the second vertical shell, a second moving plate is installed in the vertical cavity, a mounting hole and a guide hole are respectively provided on the second moving plate, and the mounting hole is connected to the connector at the other end of the TOPCon sintering heating tube;

[0020] A sub-guide rod is installed in the guide hole. The sub-guide rod is suitable for passing through the guide hole and is arranged vertically. The bottom of the sub-guide rod is fixedly connected to the inner wall of the bottom of the vertical cavity.

[0021] In a further technical solution, side grooves are respectively provided on both sides of the second vertical housing, the side grooves are communicated with the vertical cavity, and the side grooves are suitable for the connector to pass through;

[0022] The sub-guide rods are provided in two groups, and the spacing between the sub-guide rods is greater than the corresponding width of the connector.

[0023] In a further technical solution, a threaded long hole is installed at the bottom of the movable plate 1, an adjusting screw is installed in the threaded long hole, and the adjusting screw is threadedly connected to the threaded long hole;

[0024] A position hole is provided in the vertical housing 1, and the adjusting screw is suitable for connecting with the vertical housing 1 through the position hole; a connecting bearing is installed in the position hole, the inner ring of the connecting bearing is fixedly connected with the adjusting screw, and the outer ring of the connecting bearing is connected with the vertical housing 1;

[0025] A locking nut is installed on the adjusting screw at the bottom of the position hole, and the end of the adjusting screw is located at the bottom of the locking nut.

[0026] In a further technical solution, a branch plate is provided at the bottom of one side of the vertical shell facing the TOPCon sintering heating tube.

[0027] In a further technical solution, a positioning plate is provided on the side of the vertical shell facing away from the TOPCon sintering heating tube, and a positioning hole is provided on the positioning plate, and the positioning hole is connected to the inner wall of the sintering channel; the positioning plate is a right-angle plate, and a guide plate is also installed on the top, and a calibration hole is provided in the guide plate.

[0028] Beneficial Effects

[0029] The utility model has the following advantages:

[0030] 1) Change the lamp structure, modify the traditional sintering heating tube from a straight line to a ladder shape, ensure the stability of the furnace temperature and reduce the temperature difference. Make the effective heating area of ​​the lamp completely cover the battery cell being transported, and ensure that the temperature of each position of the battery cell is consistent.

[0031] 2) By adjusting the locking nut downward and rotating the adjusting screw, the top thread drives the movable plate 1 to move up and down, thereby moving one end of the TOPCon sintering heating tube to a suitable position, and rotating the locking nut in the opposite direction to fix the position of the movable plate 1.

[0032] 3) By setting the calibration holes, during the initial installation, a group of guide rods can be passed through the calibration holes in the multiple positioning members 1, so as to achieve quick installation of the positioning members 1 at multiple positions, thereby achieving a convenient connection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a front schematic diagram of the sintering furnace of the utility model;

[0035] Figure 2 This is a structural diagram of the TOPCon sintering heating tube of the utility model;

[0036] Figure 3 This is a partial cross-sectional view of the TOPCon sintering heating tube in the sintering furnace;

[0037] Figure 4 This is a cross-sectional structural diagram of the TOPCon sintered heating tube of the utility model;

[0038] Figure 5 This is a structural diagram of a TOPCon sintering heating tube according to another embodiment of the present invention;

[0039] Figure 6 It is a cross-sectional view of the positioning member 1 and the positioning member 2 of the structure diagram of the TOPCon sintering heating tube of the utility model;

[0040] Figure 7 for Figure 6 A magnified view of part A;

[0041] Figure 8 This is a structural diagram of the positioning member 2 of the utility model;

[0042] Fig. 9 It is a side sectional view of the positioning member of the utility model;

[0043] Fig.10 This is a structural diagram of a positioning member 1 of the utility model.

[0044] In the figure:

[0045] 1. Main body; 2. Oblique part; 3. End body; 4. Connector; 5. Lamp housing; 6. Heating wire; 7. Halogen gas; 8. Positioning piece 1; 9. Positioning piece 2; 10. Mounting hole; 11. Electrode;

[0046] 21. Transition fillet; 81. Vertical housing 1; 82. Moving plate 1; 83. Long threaded hole; 84. Adjusting screw; 85. Position hole; 86. Connecting bearing; 87. Locking nut; 88. Branch plate; 89. Positioning plate; 810. Positioning hole; 811. Guide plate; 812. Alignment hole;

[0047] 91. Vertical housing 2; 92. Moving plate 2; 93. Guide hole; 95. Sub-guide rod; 96. Side groove;

[0048] 100, sintering furnace; 200, sintering mesh; 300, battery cell; DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Example 1

[0051] like Figure 1-4 As shown, it is an implementation scheme of the utility model, combined with Figure 1 From the perspective of the TOPCon sintering heating structure used in a sintering furnace, it is installed in pairs in a sintering furnace 100. A sintering channel is provided in the sintering furnace 100, and a conveying structure is installed in the sintering channel. The conveying structure includes a sintering net 200, and the sintering net 200 is suitable for placing a battery cell 300. The sintering furnace uses an upper and lower sintering heating layer, and as shown in the prior art, it is distributed into a drying area, a pre-sintering area, and a sintering area, which is used to heat a single crystal silicon wafer or a multi-crystalline silicon wafer to crystallize it in some areas to form a crystal with long-range order. Impurities in the silicon wafer can be diffused in large quantities, thereby eliminating the influence of impurities, increasing the disorder of the crystal, and thus improving the conversion efficiency and power output of the battery cell.

[0052] The invention comprises a TOPCon sintering heating tube and a positioning assembly, wherein the positioning assembly is suitable for connecting with a sintering channel; a TOPCon sintering heating tube main body 1, wherein both ends of the main body 1 are provided with an oblique portion 2, an end body 3 is provided at one end of the oblique portion 2 away from the main body 1, and a connector 4 is installed at one end of the end body 3 away from the oblique portion 2; Figure 2 As shown. The main body 1, the oblique part 2 and the end body 3 are integrally connected;

[0053] TOPCon sintering heating tubes are installed on the upper and lower sides of the conveying structure, and the distance between the main bodies 1 of the two groups of TOPCon sintering heating tubes is greater than the distance between the two groups of end bodies 3. Figure 3Arranging the two ends closer can compensate for the growth of silicon wafers at the ends, and changing the structure of the lamp tubes so that the effective heating area of ​​the lamp tubes completely wraps the battery cells being conveyed, ensuring that the temperature of each position of the battery cells is consistent. Furthermore, the structure of the lamp tubes inside the wall of the sintering furnace is changed, and the traditional halogen lamp tubes are used for processing. The added sections of lamp tubes on both sides are changed from a straight shape to a ladder shape to ensure the stability of the furnace temperature and reduce the temperature difference. During installation, the connector at the end can be threaded, pin-connected, fixedly connected, etc. In this embodiment, the positioning component is a connecting plate, which is fixedly connected to the inner wall of the sintering furnace wall, and the connecting head passes through the connecting plate. Holes are set at the end for electrode wiring and connecting an external power supply. The connecting head is fixedly connected in the sintering furnace. Figure 3 shown.

[0054] The main body 1 is parallel to the end body 3, and the main body 1 is arranged parallel to the battery cell 300; the main body 1, the oblique part 2 and the end body 3 all include a lamp housing 5 and a heating wire 6, and are filled with halogen gas 7, referring to a halogen lamp; the heating wire is fixed in the lamp housing 5 mainly for structural strength to maintain its shape.

[0055] Electrodes 11 are arranged in the two groups of end bodies 3. The length of the main body 1 is 6 to 7 times the length of the end body 3. Transition fillets 21 are arranged at both ends of the oblique portion 2, and the radius of the transition fillet 21 is A, 15mm≤A≤25mm, and the inclination angle between the oblique portion 2 and the main body 1 is 30° to 40°. Figure 4 It is shown as a relatively standard structure, with halogen gas 7 filled inside. The length of the main body is adapted to the size of the sintering channel of the corresponding sintering furnace. The radius of the transition fillet is limited to 25mm on the outside and 15mm on the inside. The height of the lamp housing is 10mm, and the material of the lamp housing can be quartz glass.

[0056] Example 2

[0057] like Figure 5-10 As shown, another implementation scheme of the present invention is provided. Based on Example 1, in order to overcome the tilt problem that occurs during actual installation, a positioning assembly for the sintered heating tube that can maintain horizontality is provided.

[0058] like Figure 5 As shown, the positioning assembly includes a positioning member 8 and a positioning member 9. The positioning member 8 includes a vertical shell 81. A movable cavity is provided in the vertical shell 81. A movable plate 82 is installed in the movable cavity. A mounting hole 10 is provided on the movable plate 82. The mounting hole 10 is connected to the connector 4. The positioning member 8 and the positioning member 9 are respectively installed at both ends of the TOPCon sintering heating tube.

[0059] like Figure 7As shown, a threaded long hole 83 is installed at the bottom of the moving plate 1 82, and an adjusting screw 84 is installed in the threaded long hole 83, and the adjusting screw 84 is threadedly connected with the threaded long hole 83; a position hole 85 is opened in the vertical shell 1 81, and the adjusting screw 84 is suitable for connecting with the vertical shell 1 81 through the position hole 85; a connecting bearing 86 is installed in the position hole 85, and the inner ring of the connecting bearing 86 is fixedly connected with the adjusting screw 84, and the outer ring of the connecting bearing 86 is connected with the vertical shell 1 81; a locking nut 87 is installed on the adjusting screw 84 at the bottom of the position hole 85, and the end of the adjusting screw 84 is located at the bottom of the locking nut 87. When in use, by adjusting the locking nut position downward, rotating the adjusting screw, the top thread drives the moving plate 1 82 to move up and down, thereby realizing the movement of one end of the TOPCon sintering heating tube, moving to a suitable position, and rotating the locking nut in the opposite direction to realize the position fixation of the moving plate 1.

[0060] like Fig.10 The figure shown is a structural diagram of the positioning member 1, and is only an implementation structural diagram. A branch plate 88 is provided at the bottom of the side of the vertical shell 1 81 facing the TOPCon sintering heating tube. A positioning plate 89 is provided on the side of the vertical shell 81 facing away from the TOPCon sintering heating tube. A positioning hole 810 is provided on the positioning plate 89, and the positioning hole 810 is connected to the inner wall of the sintering channel; further, the positioning plate 89 is a right-angle plate, and a guide plate 811 is also installed on the top, and a proofreading hole 812 is provided in the guide plate 811. The positioning plate 89 is provided with a positioning hole 810, which is detachably connected to the inner wall of the sintering channel by installing bolts in the positioning hole. By providing the proofreading hole, during the initial installation, a group of guide rods can be passed through the proofreading holes in multiple positioning members 1, thereby realizing the rapid installation of positioning members 1 at multiple positions, thereby achieving a convenient connection effect. Further, as Fig.10 As shown, a side groove is provided on the vertical shell to realize the vertical movement of the connector after passing through the mounting hole when necessary. The shape of the connector is different from that of Example 1 and can be cylindrical.

[0061] like Figure 8 As shown, the second positioning member 9 includes a second vertical shell 91, a vertical cavity is provided in the second vertical shell 91, a second moving plate 92 is installed in the vertical cavity, a mounting hole 10 and a guide hole 93 are respectively provided on the second moving plate 92, and the mounting hole 10 is connected to the connector 4 at the other end of the TOPCon sintering heating tube;

[0062] A sub-guide rod 95 is installed in the guide hole 93. The sub-guide rod 95 is suitable for passing through the guide hole 93 and is arranged vertically. The bottom of the sub-guide rod 95 is fixedly connected to the inner wall of the bottom of the vertical cavity.

[0063] Side grooves 96 are provided on both sides of the second vertical shell 91, which are connected to the vertical cavity and suitable for the connector 4 to pass through; two groups of sub-guide rods 95 are provided, and the spacing is greater than the corresponding width of the connector 4. A position plate with a similar function to the positioning plate is added to one side of the second vertical shell. The position plate and the sintering channel can be detachably connected to achieve the fixation of the second vertical shell in the sintering channel. At least two groups of parallel rods should be provided in the sintering channel to connect multiple groups of TOPCon sintering heating tubes. Figure 3 It is shown in .

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0065] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A TOPCon sintering heating structure for use in a sintering furnace, which is installed in pairs in the sintering furnace (100), wherein a sintering channel is provided in the sintering furnace (100), and a conveying structure is installed in the sintering channel, wherein the conveying structure comprises a sintering net (200), and the sintering net (200) is suitable for placing a battery cell (300); Features: It includes a TOPCon sintering heating tube and a positioning assembly, wherein the positioning assembly is suitable for connecting with a sintering channel; The TOPCon sintered heating tube comprises a main body (1), oblique parts (2) are arranged at both ends of the main body (1), an end body (3) is arranged at one end of the oblique part (2) away from the main body (1), and a connector (4) is installed at one end of the end body (3) away from the oblique part (2); The main body (1), the oblique portion (2) and the end body (3) are integrally connected; TOPCon sintering heating tubes are respectively installed on the upper and lower sides of the conveying structure, and the spacing between the main bodies (1) of the two corresponding groups of TOPCon sintering heating tubes is greater than the spacing between the two groups of end bodies (3).

2. A TOPCon sintering heating structure for a sintering furnace according to claim 1, characterized in that: The main body (1) is parallel to the end body (3), and the main body (1) is arranged parallel to the battery cell (300); The main body (1), the oblique part (2) and the end body (3) all include a lamp housing (5) and a heating wire (6), and are filled with halogen gas (7); electrodes (11) are arranged in the two groups of end body parts (3).

3. The TOPCon sintering heating structure for use in a sintering furnace according to claim 1, characterized in that: The length of the main body (1) is 6 to 7 times the length of the end body (3).

4. The TOPCon sintering heating structure for a sintering furnace according to claim 1, characterized in that: Transition fillets (21) are provided at both ends of the oblique portion (2), and the radius of the transition fillet (21) is A, 15mm≤A≤25mm, and the inclination angle between the oblique portion (2) and the main body (1) is 30° to 40°.

5. The TOPCon sintering heating structure for use in a sintering furnace according to claim 4, characterized in that: The positioning assembly comprises a positioning member 1 (8) and a positioning member 2 (9), wherein the positioning member 1 (8) comprises a vertical shell 1 (81), wherein a movable cavity is provided in the vertical shell 1 (81), wherein a movable plate 1 (82) is installed in the movable cavity, wherein a mounting hole (10) is provided on the movable plate 1 (82), and wherein the mounting hole (10) is connected to the connector (4); The positioning member 1 (8) and the positioning member 2 (9) are respectively installed at two ends of the TOPCon sintering heating tube.

6. The TOPCon sintering heating structure for use in a sintering furnace according to claim 5, characterized in that: The second positioning member (9) comprises a second vertical shell (91), a vertical cavity is provided in the second vertical shell (91), a second movable plate (92) is installed in the vertical cavity, a mounting hole (10) and a guide hole (93) are respectively provided on the second movable plate (92), and the mounting hole (10) is connected to the connector (4) at the other end of the TOPCon sintering heating tube; A sub-guide rod (95) is installed in the guide hole (93). The sub-guide rod (95) is suitable for passing through the guide hole (93) and is arranged vertically. The bottom of the sub-guide rod (95) is fixedly connected to the inner wall of the bottom of the vertical cavity.

7. A TOPCon sintering heating structure for a sintering furnace according to claim 6, characterized in that: Side grooves (96) are respectively provided on both sides of the second vertical housing (91), the side grooves (96) are communicated with the vertical cavity, and the side grooves (96) are suitable for the connector (4) to pass through; The sub-guide rods (95) are provided in two groups, and the spacing between them is greater than the corresponding width of the connector (4).

8. The TOPCon sintering heating structure for use in a sintering furnace according to claim 5, characterized in that: A threaded long hole (83) is installed at the bottom of the movable plate 1 (82), an adjusting screw (84) is installed in the threaded long hole (83), and the adjusting screw (84) is threadedly connected to the threaded long hole (83); A position hole (85) is provided in the vertical housing (81), and the adjusting screw (84) is suitable for connecting with the vertical housing (81) through the position hole (85); a connecting bearing (86) is installed in the position hole (85), the inner ring of the connecting bearing (86) is fixedly connected with the adjusting screw (84), and the outer ring of the connecting bearing (86) is connected with the vertical housing (81); A locking nut (87) is installed on the adjusting screw (84) at the bottom of the position hole (85), and the end of the adjusting screw (84) is located at the bottom of the locking nut (87).

9. The TOPCon sintering heating structure for use in a sintering furnace according to claim 5, characterized in that: A branch plate (88) is provided at the bottom of one side of the vertical shell (81) facing the TOPCon sintering heating tube.

10. The TOPCon sintering heating structure used in a sintering furnace according to claim 5, characterized in that: A positioning plate (89) is provided on the side of the vertical shell (81) facing away from the TOPCon sintering heating tube, and a positioning hole (810) is provided on the positioning plate (89), and the positioning hole (810) is connected to the inner wall of the sintering channel; the positioning plate (89) is a right-angle plate, and a guide plate (811) is also installed on the top, and a calibration hole (812) is provided in the guide plate (811).

Images