Photovoltaic sintering furnace belt with low heat loss
By using alumina insulation to support silicon wafers and ensure the silicon plates are level in a mesh belt sintering furnace, the problems of heat loss and temperature non-uniformity in mesh belt sintering furnaces are solved, resulting in lower heat loss and more uniform sintering effect.
Patent Information
- Application Number
- CN202422898439.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing mesh belt sintering furnaces suffer from significant heat loss and temperature inhomogeneity during the transmission process, which affects the sintering quality of photovoltaic cells.
The system employs parallel mesh belts and supports. Alumina heat insulation is installed on the supports to support the silicon wafers, which are then connected to the mesh belts via fasteners. The alumina heat insulation is inclined to reduce heat exchange, and a support plate is installed on the supports to ensure the silicon wafers are level, thereby reducing heat loss and improving sintering uniformity.
It effectively reduces heat exchange between the inside and outside of the furnace, stabilizes the temperature distribution, reduces heat loss, improves the uniformity of the photovoltaic cell sintering process, and avoids poor sintering phenomena.
Smart Images
Figure CN223678216U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic cell manufacturing technical field, concretely is a low heat loss's photovoltaic sintering furnace furnace zone. BACKGROUND
[0002] At present in the photovoltaic industry, the passivated emitter rear contact cell (PERC) route and the tunnel oxide passivated contact cell (TOPCon) route still occupy the main share of the market. The electrode metallization process of the above two kinds of cell technologies is completed through screen printing-high temperature sintering. Under the trend of cost reduction and efficiency improvement in the industry, the requirements of the sintering process are gradually improved, that is, lower sintering temperature and more uniform and stable temperature field. The commonly used photovoltaic metallization sintering furnace can be roughly divided into two types: mesh belt sintering furnace and roller type sintering furnace. Among them, the mesh belt sintering furnace uses a metal mesh belt to transport silicon wafers, allowing the silicon wafers to move between different temperature chambers to complete the sintering process. The mesh belt sintering furnace has the characteristics of simple transmission structure and easy maintenance, so it has more cost advantages. However, due to the high thermal conductivity of the metal mesh belt, the heat exchange with the environment during transmission is obvious, resulting in a loss of temperature in the furnace. In addition, during the sintering process, the part of the silicon wafer in contact with the mesh belt also shows obvious heat loss. The heat loss of the silicon wafer will cause uneven temperature distribution in the wafer and produce sintering defects (such as black edges and support point printing), thereby causing economic losses. With the continuous iteration of technology, the sintering furnace temperature is gradually reduced, and this problem will be more obvious. In order to strengthen the heat management of the mesh belt sintering furnace, reduce heat loss and improve the thermal uniformity in the furnace, the mesh belt structure needs to be improved.
[0003] Therefore, we provide a low heat loss photovoltaic sintering furnace belt to solve the above problems. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at making up for the deficiency of prior art, and provides a low heat loss photovoltaic sintering furnace belt, which solves the technical problem of large temperature difference, large heat loss and influence on silicon plate forming in prior art.
[0005] The utility model provides the following technical scheme in order to solve the above technical problem: a low heat loss photovoltaic sintering furnace belt, which comprises mesh belt one and mesh belt two arranged in parallel, and support bodies are arranged on the mesh belt one and the mesh belt two at equal intervals, alumina heat insulators are installed on the support bodies, and the top of the alumina heat insulator is adapted to support a silicon wafer; the support body is connected to the mesh belt one or the mesh belt two through a fixing piece.
[0006] The two groups of support bodies are symmetrically arranged, and the alumina heat insulator is inclined, and the alumina heat insulator is in movable abutment with the silicon wafer; the fixing piece comprises a steel wire support.
[0007] In a further technical solution, the support body comprises a vertical edge, an inclined side edge and a bottom edge, the bottom edge is horizontally arranged and is connected perpendicularly to the vertical edge;
[0008] The bottom edge is welded to the mesh belt I or the mesh belt II.
[0009] The inclined side edge is arranged in a bottom arc with the bottom edge, and a top of the inclined side edge is arranged in a top round head with the vertical edge.
[0010] In a further technical solution, an angle between the bottom edge and the alumina heat insulation body is 40-65°.
[0011] In a further technical solution, two ends of the alumina heat insulation body are provided with grooves, and two groups of short columns are arranged in the positioning groove; the short columns are suitable for being inserted into the grooves.
[0012] In a further technical solution, a groove depth of the groove is 1-2 mm.
[0013] In a further technical solution, a supporting plate is further arranged on the alumina heat insulation body, and the supporting plate is integrally connected with the alumina heat insulation body.
[0014] The supporting plate comprises a connecting portion and a horizontal portion, the connecting portion is fixedly connected with the alumina heat insulation body, the connecting portion is integrally connected with the horizontal portion and is circularly arc-transited at a connecting position, and the horizontal portion is suitable for supporting a silicon plate.
[0015] In a further technical solution, ends of the mesh belt I and the mesh belt II are provided with transmission rollers, the mesh belt I and the mesh belt II are provided with meshes, the transmission rollers are provided with inserting columns, and the inserting columns are suitable for being movably inserted into the meshes.
[0016] In a further technical solution, the positioning groove is in a cross shape, a middle portion of the alumina heat insulation body is provided with a middle hole, and the middle hole is connected with the positioning groove through a mounting screw.
[0017] In a further technical solution, the connecting portion is in a V shape and is connected with the alumina heat insulation body.
[0018] Compared with the prior art, the following beneficial effects are achieved:
[0019] The mesh belt type sintering furnace can reduce heat exchange between the inside and the outside of the furnace caused by mesh belt transmission, help stabilize temperature distribution in the furnace, reduce heat loss and save energy. In addition, the mesh belt type sintering furnace can also avoid that the mesh belt absorbs heat of the silicon wafer, help improve uniformity of a photovoltaic cell sintering process and avoid sintering defects.
[0020] Secondly, through the setting of the supporting plate, the silicon plate can be kept in a horizontal state to ensure the uniformity of baking and the baking effect.
[0021] The cross-shaped alumina heat insulator can realize the effect of driving the silicon plate to run along the furnace belt by large friction and the effect of convenient installation. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural schematic view of a furnace belt of a pipe sintering furnace in the prior art;
[0023] Figure 2 is a plan schematic view of a furnace belt of a pipe sintering furnace in the prior art;
[0024] Figure 3 is a plan schematic view of a furnace belt of the utility model;
[0025] Figure 4 is a structural view of embodiment 1 of the utility model;
[0026] Figure 5 is a support structure view of embodiment 2 of the utility model;
[0027] Figure 6 is a support structure installation view of embodiment 2 of the utility model;
[0028] Figure 7 is a sectional view of the inclined side surface of the utility model;
[0029] Figure 8 is a support structure installation view of embodiment 3 of the utility model;
[0030] Figure 9 is a support structure installation view of embodiment 4 of the utility model;
[0031] Figure 10 is a support structure installation view of embodiment 5 of the utility model;
[0032] IN THE DRAWINGS:
[0033] 1, mesh belt one; 2, mesh belt two; 3, support body; 4, alumina heat insulator; 5, positioning groove; 6, supporting plate; 7, transmission roller; 31, vertical edge; 32, inclined side edge; 33, bottom edge; 34, bottom arc; 35, top round head; 42, middle hole; 51, short column; 61, connecting part; 62, horizontal part; 71, insertion column; DETAILED DESCRIPTION
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0035] Existing technologies such as Figure 1 and 2 As shown, Figure 1 The images show 3D structural diagrams and three-view drawings of commonly used metal mesh belts. Figure 2 This is a horizontal schematic diagram. To reduce heat loss caused by the conveyor belt, the conveyor belt area needs to be reduced; to prevent heat loss from the silicon wafers via the metal mesh belt, the mesh belt support points need to be replaced with a low thermal conductivity material, or a heat insulation layer needs to be applied at the contact points. Therefore, the structure of the mesh belt needs to be optimized.
[0036] Example 1
[0037] like Figure 3 and 4 As shown, this is one embodiment of the present invention, a photovoltaic sintering furnace belt with low heat loss, including a mesh belt 1 and a mesh belt 2 arranged in parallel. Support bodies 3 are evenly spaced on the mesh belt 1 and the mesh belt 2. An alumina heat insulation body 4 is installed on the support body 3. The top of the alumina heat insulation body 4 is suitable for supporting a silicon plate.
[0038] The support 3 is connected to either mesh belt 1 or mesh belt 2 by fasteners, including a steel wire bracket 8. The alumina insulation body 4 has grooves at both ends that insert into the steel wire bracket 8. The steel wire diameter 8 is welded to mesh belt 1 or mesh belt 2. The grooves should not be completely opened, so that the alumina insulation body 4 will not slide along the direction of the wire, and the alumina insulation body 4 can be easily replaced.
[0039] Both mesh belt 1 and mesh belt 2 are equipped with drive rollers 7 at their ends. Both mesh belt 1 and mesh belt 2 have mesh openings. The drive rollers 7 are equipped with inserts 71, which are adapted to be movably inserted into the mesh openings.
[0040] In terms of the conveyor belt structure, two parallel narrow conveyor belts are used instead of the original single wide conveyor belt design. By eliminating the connecting part of the conveyor belt in the middle, the total area of the conveyor belt is greatly reduced, thereby reducing the heat that the conveyor belt can absorb;
[0041] The two sets of support bodies 3 are symmetrically arranged, and the alumina heat insulation body 4 is inclined and the alumina heat insulation body 4 is in movable contact with the silicon plate.
[0042] Example 2
[0043] Referring to Figure 3 and 5 -7, another technical scheme is provided, based on the embodiment 1,
[0044] The support body 3 comprises a vertical edge 31, an inclined side edge 32 and a bottom edge 33, the bottom edge 33 is horizontally arranged and is connected with the vertical edge 31 perpendicularly; the bottom edge 33 is welded with the mesh belt one 1 or the mesh belt two 2; a bottom arc 34 is arranged between the inclined side edge 32 and the bottom edge 33, and a top circular head 35 is arranged between the top of the inclined side edge 32 and the vertical edge 31; the included angle between the alumina heat insulator 4 and the bottom edge 33 is 40-65°.
[0045] In terms of the silicon wafer support point, the alumina heat insulator 4 is used to replace the exposed steel wire of the old version support point to contact with the silicon wafer. In order to facilitate the replacement of the alumina heat insulator 4, a groove with a depth of 1-2mm is formed at both ends of the alumina heat insulator 4, so that the alumina heat insulator 4 can be inserted into the groove.
[0046] The positioning groove 5 is arranged on the support body 3, and the alumina heat insulator 4 is movably inserted into the positioning groove 5. The alumina heat insulator 4 is provided with a groove at both ends, and two groups of short columns 51 are arranged in the positioning groove 5; the short columns 51 are adapted to be inserted into the groove.
[0047] The utility model can reduce the heat exchange between the inside and outside of the mesh belt sintering furnace caused by the mesh belt transmission, help to stabilize the temperature distribution in the furnace, reduce the heat loss and save energy. In addition, the utility model can also avoid the heat absorption of the silicon wafer by the mesh belt, help to improve the uniformity of the photovoltaic cell sintering process and avoid poor sintering.
[0048] Embodiment 3
[0049] Referring to Figure 8 Another technical scheme is provided, based on the embodiment 1, in order to realize the support of the silicon plate and realize the horizontal arrangement of the silicon plate on the mesh belt of the sintering furnace, so as to realize the relatively uniform baking effect. The support plate 6 is further arranged on the alumina heat insulator 4, and the support plate 6 is integrally connected with the alumina heat insulator 4; the support plate 6 comprises a connecting part 61 and a horizontal part 62, the connecting part 61 is fixedly connected with the alumina heat insulator 4, the connecting part 61 is integrally connected with the horizontal part 62 and the connecting position is circularly transitioned, and the horizontal part 62 is adapted to support the silicon plate. In use, the silicon plate can be placed in a horizontal state on the four groups of horizontal parts 62 to ensure the baking uniformity.
[0050] Embodiment 4
[0051] As Figure 9As shown in the drawings, the utility model provides another technical scheme, on the basis of example 1, the shape of aluminium oxide heat insulator 4 is modified to reduce the silicon plate relative to aluminium oxide heat insulator 4 sliding. The positioning groove 5 is cross-shaped, and the middle part of aluminium oxide heat insulator 4 is provided with middle hole 42, and is connected with positioning groove 5 by mounting screw, and compared with the clamping mode, the threaded mounting has the certainty of connection effect, and can realize the effect of easy replacement, and is convenient for later maintenance.
[0052] Example 5
[0053] As Figure 10 shown, the utility model provides another technical scheme, on the basis of example 3, the connecting portion 61 is connected with aluminium oxide heat insulator 4 and is in the shape of V. It is used to realize the supporting effect of example 2, and the V-shaped structure is beneficial to stable supporting effect, and does not affect the installation of screw.
[0054] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiment should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.
Claims
1. A low heat loss photovoltaic sintering furnace belt, characterized in that, The application relates to a silicon wafer supporting device, which comprises parallelly arranged net belt one (1) and net belt two (2), wherein support bodies (3) are arranged at equal intervals on the net belt one (1) and the net belt two (2), alumina heat insulating bodies (4) are mounted on the support bodies (3), and the top of the alumina heat insulating body (4) is adapted to support a silicon wafer; the support body (3) is connected to the net belt one (1) or the net belt two (2) through a mounting fixing part.
2. A low heat loss photovoltaic sintering furnace belt according to claim 1, characterized in that, The two groups of support bodies (3) are symmetrically arranged, the alumina heat insulating bodies (4) are arranged in an inclined mode, the alumina heat insulating bodies (4) are in movable abutment with the silicon wafer, and the fixing part comprises a steel wire support (8).
3. A low heat loss photovoltaic sintering furnace belt according to claim 1, characterized in that, The support body (3) comprises a vertical edge (31), an inclined side edge (32) and a bottom edge (33), the bottom edge (33) is horizontally arranged and is connected perpendicularly to the vertical edge (31). The bottom edge (33) is welded to the net belt one (1) or the net belt two (2). A bottom circular arc (34) is arranged between the inclined side edge (32) and the bottom edge (33), and a top circular head (35) is arranged between the top of the inclined side edge (32) and the vertical edge (31). A positioning groove (5) is arranged on the support body (3), and the alumina heat insulating body (4) is movably inserted into the positioning groove (5).
4. A low heat loss photovoltaic sintering furnace belt according to claim 1, characterized in that, The included angle between the alumina heat insulating body (4) and the bottom edge (33) is 40-65 degrees.
5. A low heat loss photovoltaic sintering furnace belt according to claim 4, characterized in that, Grooves are arranged at the two ends of the alumina heat insulating body (4), and two groups of short columns (51) are arranged in the positioning groove (5); the short columns (51) are adapted to be inserted into the grooves.
6. A low heat loss photovoltaic sintering furnace belt according to claim 5, characterized in that, The groove depth of the groove is 1-2 mm.
7. A low heat loss photovoltaic sintering furnace belt according to claim 6, characterized in that, A supporting plate (6) is further arranged on the alumina heat insulating body (4), and the supporting plate (6) is integrally connected with the alumina heat insulating body (4). The supporting plate (6) comprises a connecting part (61) and a horizontal part (62), the connecting part (61) is fixedly connected with the alumina heat insulating body (4), the connecting part (61) is integrally connected with the horizontal part (62) and the connecting position is circularly arc transition, and the horizontal part (62) is adapted to support the silicon wafer.
8. A low heat loss photovoltaic sintering furnace belt according to any one of claims 1 to 7, characterized in that, Ends of the net belt one (1) and the net belt two (2) are provided with driving rollers (7), meshes are arranged on the net belt one (1) and the net belt two (2), a plug-in column (71) is mounted on the driving roller (7), and the plug-in column (71) is adapted to be movably inserted into the mesh.
9. A low heat loss photovoltaic sintering furnace conveyor belt as claimed in claim 5, wherein, The positioning groove (5) is in a cross shape, a middle hole (42) is arranged in the middle of the alumina heat insulating body (4), and a mounting screw is connected with the positioning groove (5).
10. A low heat loss photovoltaic sintering furnace conveyor belt as claimed in claim 7, wherein, The connecting part (61) is in a "V" shape and is connected with the alumina heat insulating body (4).