Sintering track for improving EL track mark of TOPCon battery and ejector pin of sintering track
By designing a thimble with a specific triangular wedge-shaped frame structure, the problem of track printing during TOPCon battery sintering is solved, the contact area between the battery cells and the track is optimized, and the overall production yield is improved.
Patent Information
- Application Number
- CN202420643009.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-29
AI Technical Summary
During the sintering process, the aluminum spike expansion and oxide layer damage caused by high temperature affect the conversion efficiency. The track printing under low temperature sintering seriously affects the EL yield, resulting in a low overall yield.
Design a thimble with an improved triangular wedge frame structure, including vertical edge, bottom edge and oblique side, the bottom edge is perpendicular to the vertical edge, the angle between the oblique side and the bottom edge is 25°-26°, and the oblique side is The maximum outer diameter is 0.9mm-1.1mm, which is used to improve the contact area and angle of the sintered track to reduce the occurrence of track printing.
By optimizing the structure of the thimble, the contact position area between the battery cell and the track is reduced, the incidence of track printing is reduced, and the overall production yield is improved.
Smart Images
Figure CN222279285U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a sintered crawler and an ejector pin thereof for improving the crawler print of a TOPCon battery EL. Background Art
[0002] Because silver aluminum paste is used on the front of the TOPCon battery, the higher sintering temperature will cause the aluminum spikes to expand, which will in turn affect Voc and lead to low conversion efficiency. The back of the TOPCon battery is a tunneling structure. Higher temperatures will destroy the oxide layer, causing the tunneling structure to lose its function, and the majority and minority carriers to recombine on the surface of the silicon substrate, which will in turn affect Voc and lead to low conversion efficiency. Therefore, sintering must be done at a relatively low temperature to ensure the conversion efficiency of the TOPCon battery. However, under relatively low temperature conditions, the EL of the battery cell will be in contact with the sintering track, resulting in more serious track marks, affecting the EL yield and thus the overall yield of the workshop. Currently, conventional sintering track ejectors have a triangular wedge-shaped frame structure, including vertical edges, bottom edges and inclined edges. The diameter of the ejector is generally
[0003] 1.2-1.5mm, the angle between the bottom edge and the inclined edge is 12°-21°, and there is still room to reduce the area where the battery cell contacts the track. However, if the angle is too large, it will cause hidden cracks in the silicon wafer. If the angle is too small, the EL track print will be poor, which will reduce the overall yield. Utility Model Content
[0004] The technical problem to be solved by the utility model is: in order to overcome the above technical problems, the utility model provides a sintered track and an ejector pin thereof for improving the track print of TOPCon battery EL.
[0005] The technical solution adopted by the utility model to solve the technical problem is: a top pin for improving the EL track print of a TOPCon battery, which has a triangular wedge-shaped frame structure, including a vertical edge, a bottom edge and an inclined edge, wherein the vertical edge, the bottom edge and the inclined edge are connected in sequence, the bottom edge is perpendicular to the vertical edge, the angle α between the bottom edge and the inclined edge is 25°-26°, and the maximum outer diameter of the inclined edge is 0.9mm-1.1mm.
[0006] Preferably, the maximum outer diameter of the inclined edge is 1.0 mm, and the angle α between the bottom edge and the inclined edge is 25.91°.
[0007] A sintered track comprises a track body and an ejector pin for improving the EL track print of a TOPCon battery. The ejector pins are symmetrically fixed on both sides of the track body, the bottom edge of the ejector pin is horizontally fixed to the track body, the angle between the inclined edge of the ejector pin and the track body is 25°-26°, and the two sides of the TOPCon battery are respectively in point contact with the inclined edges of the ejector pins symmetrically arranged on both sides of the track body.
[0008] The angle between the inclined edge of the ejector pin and the crawler body is 25.91°.
[0009] The ejector pin is welded on the crawler body.
[0010] The beneficial effect of the utility model is that the sintered track and the ejector pin thereof for improving the EL track print of the TOPCon battery can minimize the area of the position where the battery cell contacts the track, reduce the EL track print defects, and improve the overall yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0012] Figure 1 It is a structural schematic diagram of the ejector pin of the utility model.
[0013] Figure 2 It is a structural schematic diagram of the sintering crawler of the utility model.
[0014] In the figure, 1, ejector pin, 1-1, vertical edge, 1-2, bottom edge, 1-3, inclined edge, 2, track body. DETAILED DESCRIPTION
[0015] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0016] like Figure 1 As shown, the utility model is a kind of ejector 1 for improving the EL track print of TOPCon battery, which is a triangular wedge-shaped frame structure, including a vertical side 1-1, a bottom side 1-2 and an inclined side 1-3, the vertical side 1-1, the bottom side 1-2 and the inclined side 1-3 are connected in sequence, the bottom side 1-2 and the vertical side 1-1 are perpendicular to each other, the angle α between the bottom side 1-2 and the inclined side 1-3 is 25°-26°, and the maximum outer diameter of the inclined side 1-3 is 0.9mm-1.1mm. If the range of angle α becomes smaller, the track print cannot be improved 100%, and if the range of angle α becomes larger, it will cause hidden cracks in the silicon wafer. The range of angle α of the utility model is adjusted under the normal production conditions of TOPCon battery on site, and the optimal angle range is obtained. Similarly, if the maximum outer diameter of the inclined edge 1-3 continues to decrease, it will break during sintering. After the high temperature of sintering, it is easy to break, and the track life will be short. If the maximum outer diameter of the inclined edge 1-3 increases, it will not effectively improve the track print. The maximum outer diameter range of the inclined edge 1-3 of the utility model is adjusted under normal production conditions of TOPCon battery site, and the optimal range is obtained.
[0017] In the optimal embodiment, the maximum outer diameter of the inclined edge 1-3 is 1.0 mm, and the angle α between the bottom edge 1-2 and the inclined edge 1-3 is 25.91°.
[0018] like Figure 2 As shown, a sintered crawler of the utility model has a crawler body 2 and an ejector 1 of the utility model. The ejector 1 is symmetrically fixed on both sides of the crawler body 2, the bottom edge 1-2 of the ejector 1 is horizontally fixed to the crawler body 2, and the angle between the inclined edge 1-3 of the ejector 1 and the crawler body 2 is 25°-26°. The two sides of the TOPCon battery are respectively in point contact with the inclined edges 1-3 of the ejector 1 symmetrically arranged on both sides of the crawler body 2.
[0019] In the most preferred embodiment, the angle between the inclined edge 1 - 3 of the ejector pin 1 and the track body 2 is 25.91°.
[0020] In order to facilitate the fixing of the ejector pin 1 , the ejector pin 1 is welded to the crawler body 2 .
[0021] The utility model adjusts the diameter and angle of the ejector pin 1. The principle is to minimize the area of the contacting ejector pin while ensuring the normal production of the battery sheet, thereby improving the EL track print.
[0022] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A TOPCON battery EL track print improving ejector pin (1), characterized in that: The invention has a triangular wedge-shaped frame structure, comprising a vertical side (1-1), a bottom side (1-2) and an inclined side (1-3), wherein the vertical side (1-1), the bottom side (1-2) and the inclined side (1-3) are connected in sequence, the bottom side (1-2) and the vertical side (1-1) are perpendicular to each other, an angle α between the bottom side (1-2) and the inclined side (1-3) is 25°-26°, and a maximum outer diameter of the inclined side (1-3) is 0.9 mm-1.1 mm.
2. The ejector pin (1) for improving EL track print of TOPCon battery according to claim 1, characterized in that: The maximum outer diameter of the inclined edge (1-3) is 1.0 mm, and the angle α between the bottom edge (1-2) and the inclined edge (1-3) is 25.91°.
3. A sintered crawler, comprising a crawler body (2), characterized in that: It also has an ejector pin (1) for improving the EL track print of a TOPCon battery as claimed in claim 1, wherein the ejector pins (1) are symmetrically fixed on both sides of the track body (2), the bottom edge (1-2) of the ejector pin (1) is horizontally fixed to the track body (2), the angle between the inclined edge (1-3) of the ejector pin (1) and the track body (2) is 25°-26°, and the two sides of the TOPCon battery are respectively in point contact with the inclined edges (1-3) of the ejector pins (1) symmetrically arranged on both sides of the track body (2).
4. The sintered crawler according to claim 3, characterized in that: The angle between the inclined edge (1-3) of the ejector pin (1) and the crawler body (2) is 25.91°.
5. The sintered crawler according to claim 3, characterized in that: The ejector pin (1) is welded to the crawler body (2).