Sintering lamp tube and sintering furnace capable of improving poor EL of MCP tooth-shaped black edge

Abstract

The sintering lamp tube comprises a sintering furnace body, a plurality of sets of idler wheels are movably installed in the sintering furnace body, the idler wheels are in transmission connection with a chain type furnace belt in an attached mode, and a heat insulation clamping plate is fixedly installed at the top of the sintering furnace body. A plurality of sets of heat insulation supports are fixedly installed at the bottoms of the heat insulation clamping plates, heating lamp tubes are fixedly installed at the bottoms of the heat insulation supports and fixedly arranged above the chain type furnace belt, U-shaped heating lamp tubes are arranged on the side wall of the sintering furnace body, and the sintering lamp tubes are fixedly arranged on the two sides of the chain type furnace belt and located above the chain type furnace belt. According to the utility model, the problem that the EL tooth-shaped black edge of the sintered finished battery piece is poor due to the poor adaptation degree of the MCP technology and the production line manufacturing process is solved.

Description

Technical Field

[0001] The utility model belongs to the field of solar cell production and relates to a sintered lamp tube and a sintering furnace for improving the poor EL of MCP tooth-shaped black edges. Background Art

[0002] In the battery field, the MCP (Multi-Chip Package) process is not directly used in battery manufacturing, but is more often used in the packaging of battery management systems (BMS) or other electronic components. However, if we expand the concept of MCP to related packaging technologies for battery technology, it can refer to a similar high-integration packaging technology used to improve the overall performance and efficiency of battery systems.

[0003] The structure of the TOPCon battery itself uses silver-aluminum paste on the front of the battery, in which aluminum is used to help corrosion penetrate the front film layer to form good contact. The MCP process is currently widely used in the production of TOPCon batteries. The sintering strength of the MCP process is stronger and more uniform, so the aluminum content of the front silver-aluminum paste is reduced. In this case, if the edge film structure is too thick or the MCP's edge processing ability is weakened, the EL image of the finished battery cell after sintering will show jagged black edges. When the EL image of the TOPCon battery cell shows jagged black edges, this usually indicates that there are defects in the edge area of ​​the battery cell. The defects in the edge area may worsen over time, causing the battery cell performance to gradually decline and shortening its service life. Utility Model Content

[0004] The purpose of the utility model is to provide a sintered lamp tube and a sintering furnace for improving the EL defect of MCP with jagged black edges, so as to solve the problem that the EL image of the finished battery cell after sintering presents jagged black edges.

[0005] The first technical solution adopted by the present invention is a sintered lamp tube for improving the poor EL of the serrated black edge of MCP. The sintered lamp tube is a U-shaped heating lamp tube with a length of 11 to 13 cm and a width of 3 to 4 cm.

[0006] The characteristics of this utility model are:

[0007] Furthermore, the diameter of the U-shaped heating lamp is 1 to 1.5 cm.

[0008] Another technical solution adopted by the present invention is a sintering furnace for improving the poor EL of the tooth-shaped black edge of MCP, comprising a sintering furnace body, a plurality of groups of rollers movably installed inside the sintering furnace body, a chain furnace belt being fitted and connected to the rollers for transmission, a heat-insulating splint fixedly installed on the top of the sintering furnace body, a plurality of groups of heat-insulating brackets fixedly installed on the bottom of the heat-insulating splint, a heating lamp fixedly installed on the bottom of the plurality of groups of the heat-insulating brackets, and a heating lamp fixedly arranged above the chain furnace belt. It is characterized in that the side walls of the sintering furnace body are provided with the above-mentioned sintering lamps, and the sintering lamps are fixedly arranged on both sides of the chain furnace belt and located above the chain furnace belt.

[0009] The utility model is also characterized in that:

[0010] Furthermore, a drying zone, a sintering zone, and a light injection preheating zone are sequentially arranged inside the sintering furnace body, and heating lamps are fixedly installed above the drying zone, the sintering zone, and the light injection preheating zone.

[0011] Furthermore, the drying area includes 6 first temperature zones, each of which is provided with at least 6 U-shaped heating lamps, and the power of the U-shaped heating lamps is 500-1000W.

[0012] Furthermore, the sintering zone includes 9 to 13 second temperature zones, each of which is provided with at least 6 U-shaped heating lamps, and the power of the U-shaped heating lamps is 800 to 1500W.

[0013] Furthermore, the light injection preheating zone includes 6 to 7 third temperature zones, each of the third temperature zones is provided with at least 6 U-shaped heating lamps, and the power of the U-shaped heating lamps is 1000 to 1800W.

[0014] Furthermore, the U-shaped heating lamps are arranged longitudinally along the side walls of the sintering furnace body.

[0015] Furthermore, within the same temperature zone, the distance between two adjacent U-shaped heating lamps increases as the power of the U-shaped heating lamps increases.

[0016] Furthermore, the diameter of the heating lamp is 1 to 1.5 cm.

[0017] The beneficial effects of this utility model are as follows: by adding U-shaped lamps to the side of the sintering furnace, this significantly improves the sintering capability at the edges of crystalline silicon cells, effectively resolving the issue of poor edge EL images caused by the poor compatibility between the MCP process and the production line process. This innovation not only enhances process stability and reliability, but also significantly improves the yield rate of the cells, thereby optimizing overall production efficiency and reducing production costs. It has positive application value and significant benefits for any sintering method using crystalline silicon cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a top view of the horizontal group heating lamp layout of the present invention;

[0020] Figure 2 This is a cross-sectional view of the sintering furnace body of the present utility model;

[0021] Figure 3 This is a schematic diagram of the layout of heating lamps in a single temperature zone of the sintering furnace body of the present invention;

[0022] Figure 4 This is a schematic structural diagram of a sintered lamp tube according to the present invention;

[0023] In the figure, 1. roller, 2. chain furnace belt, 3. insulation bracket, 4. insulation splint, 5. heating lamp, 5-1. longitudinal group heating lamp, 5-2. transverse group heating lamp, 6. U-shaped heating lamp. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The following is combined with Figure 1 To the attached Figure 4 And specific embodiments, the utility model is discussed in detail:

[0026] refer to Figure 4A sintered lamp tube for improving the poor EL performance of MCP (Metal Coating) with serrated black edges is described. The sintered lamp tube is a U-shaped heating lamp tube 6, which has a length of 11 to 13 cm and a width of 3 to 4 cm. Compared to strip-shaped heating lamps, U-shaped heating lamps save space and have a much larger radiant area per unit area.

[0027] Furthermore, the diameter of the U-shaped heating lamp is 1 to 1.5 cm.

[0028] refer to Figures 1-2 A sintering furnace for improving the poor EL of MCP tooth-shaped black edges includes a sintering furnace body, several groups of rollers 1 are movably installed inside the sintering furnace body, and a chain furnace belt 2 is connected to the rollers 1 in a contact and driving manner. A heat-insulating splint 4 is fixedly installed on the top of the sintering furnace body, and several groups of heat-insulating brackets 3 are fixedly installed on the bottom of the heat-insulating splint 4. The bottoms of several groups of heat-insulating brackets 3 are respectively fixedly installed with heating lamps 5, and the heating lamps 5 are fixedly set above the chain furnace belt 2. The side walls of the sintering furnace body are provided with the above-mentioned sintering lamps, which are fixedly set on both sides of the chain furnace belt 2 and located above the chain furnace belt 2. By setting sintering lamps in the edge area, the problem of low temperature at the edge of photovoltaic panels is solved, and the occurrence of poor sintering at the edge of photovoltaic panels is reduced.

[0029] Furthermore, the interior of the sintering furnace body is sequentially provided with three functional zones, namely a drying zone, a sintering zone, and a light injection preheating zone. Heating lamps 5 are fixedly installed above the drying zone, the sintering zone, and the light injection preheating zone.

[0030] refer to Figure 3 There are several groups of temperature zones inside the three functional areas, and heating lamps 5 are fixedly installed above the several temperature zones. The heating lamps 5 include a horizontal group arranged horizontally and a vertical group arranged vertically. The vertical group heating lamps 5-1 are provided with at least five tubes, and the horizontal group heating lamps 5-2 are provided with at least three tubes. The heating lamps 5 are arranged into vertical group heating lamps 5-1 and horizontal group heating lamps 5-2, so that the temperature zones can be fully heated and all corners in the temperature zone can be heated. The horizontal group heating lamps 5-2 are in the same line, and each lamp is independently controlled. The temperature and temperature deviation range of each lamp can be set; the vertical group heating lamps 5-1 has five lamps, and the temperature and temperature deviation range of the five lamps are uniformly set.

[0031] Furthermore, during the TOPCon cell production process, the cell surface is coated, typically with a solution such as PVDF (polyvinylidene fluoride) or PVA (polyvinyl alcohol). During this coating process, some moisture and volatiles remain in the cell. Therefore, a drying zone is defined to remove these moisture and volatiles from the cell through air convection, ensuring smooth processing in subsequent processes. The drying zone consists of six first temperature zones, each equipped with at least six U-shaped heating lamps with a power of 500-1000W, maintaining a temperature of approximately 100°C.

[0032] Furthermore, the sintering zone is the core area in TOPCon cell production. Through precise temperature control and optimization of sintering process parameters, the sintering zone can significantly improve the conversion efficiency and photovoltaic performance of TOPCon cells. The sintering zone includes 9 to 13 secondary temperature zones, each equipped with at least 6 U-shaped heating lamps with a power of 800 to 1500W. The high-temperature sintering in the secondary temperature zone ensures that the electrode material (such as silver aluminum paste) forms a good ohmic contact with the silicon wafer.

[0033] Furthermore, the light injection preheating zone injects light energy into the cell through a specific light source, stimulating the carriers (electrons and holes) within the cell. The light injection preheating zone includes 6 to 7 third temperature zones, each of which is equipped with at least 6 U-shaped heating lamps. The power of the U-shaped heating lamps is 1000 to 1800W, which is used to provide medium-temperature lighting conditions. Light injection can also activate hydrogen atoms in the passivation film, causing them to migrate to defective locations in the silicon wafer for surface passivation. This helps reduce recombination losses in the metallized area and improve the open-circuit voltage (Voc) and fill factor (FF) of the solar cell.

[0034] Furthermore, the U-shaped heating lamps are arranged longitudinally along the side walls of the sintering furnace body.

[0035] Furthermore, within the same temperature zone, the distance between two adjacent U-shaped heating lamps increases as the power of the U-shaped heating lamps increases. The higher the power of the U-shaped heating lamps, the wider the range of heat radiation they generate. This means that high-power heating lamps will have a wider impact on the surrounding space during the heating process. To avoid the superposition of heat radiation from adjacent heating lamps, increasing the distance between adjacent heating lamps can reduce thermal interference between them and help achieve uniform temperature distribution within the furnace.

[0036] The diameter of the heating lamp is 1 to 1.5 cm.

[0037] The utility model provides a sintering furnace for improving the poor EL of MCP tooth-shaped black edges. Its working principle is to use multi-distributed heating lamps 5 and U-shaped heating tubes 6 to heat and heat photovoltaic panels in different areas, so that the temperature reaches a heating effect, the temperature of the edge area increases, and more energy is radiated. When the photovoltaic panel enters the temperature zone under the transmission of the chain furnace belt 2, the temperature distribution in the furnace cavity of the temperature zone is high at the edge and low in the middle, and the heat is continuously absorbed from the edge area. Since the photovoltaic panel dissipates heat quickly around and slowly in the middle, the heat loss absorbed from the area with high edge temperature is greater than the heat loss in the middle. When the edge of the battery absorbs more heat than the middle, the actual temperature of the edge area of ​​the battery and the middle area are not much different, the edge temperature of the photovoltaic panel will not be low, and the phenomenon of poor sintering of the edge of the photovoltaic panel will not occur.

[0038] The above further describes the present invention with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A sintered lamp tube for improving the poor EL of MCP tooth-shaped black edges, characterized by: The sintered lamp tube is a U-shaped heating lamp tube (6), and the length of the U-shaped heating lamp tube (6) is 11-13 cm, and the width is 3-4 cm.

2. The sintered lamp tube for improving the poor EL of MCP tooth-shaped black edges according to claim 1, wherein the diameter of the U-shaped heating lamp tube (6) is 1-1.5 cm.

3. A sintering furnace for improving the poor EL of the tooth-shaped black edge of MCP, comprising a sintering furnace body, wherein a plurality of groups of rollers (1) are movably installed inside the sintering furnace body, a chain furnace belt (2) is connected to the rollers (1) in a contact transmission manner, a heat-insulating splint (4) is fixedly installed on the top of the sintering furnace body, a plurality of groups of heat-insulating brackets (3) are fixedly installed on the bottom of the heat-insulating splint (4), a plurality of groups of heat-insulating brackets (3) are fixedly installed on the bottom of the plurality of groups of the heat-insulating brackets (3), and the heating lamps (5) are fixedly arranged above the chain furnace belt (2), characterized in that: The side walls of the sintering furnace body are provided with the sintering lamp tubes as claimed in claim 1, and the sintering lamp tubes are fixedly arranged on both sides of the chain furnace belt (2) and located above the chain furnace belt (2).

4. The sintering furnace for improving the EL defect of MCP tooth-shaped black edges according to claim 3, characterized in that: A drying zone, a sintering zone, and a light injection preheating zone are sequentially arranged inside the sintering furnace body, and heating lamps (5) are fixedly installed above the drying zone, the sintering zone, and the light injection preheating zone.

5. The sintering furnace for improving the EL defect of MCP tooth-shaped black edges according to claim 4, characterized in that: The drying area comprises six first temperature zones, each of which is provided with at least six U-shaped heating lamps (6), and the power of the U-shaped heating lamps (6) is 500-1000W.

6. The sintering furnace for improving the EL defect of MCP tooth-shaped black edges according to claim 4, characterized in that: The sintering zone includes 9 to 13 second temperature zones, each of which is provided with at least 6 U-shaped heating lamps (6), and the power of the U-shaped heating lamps (6) is 800 to 1500W.

7. The sintering furnace for improving the EL defect of MCP tooth-shaped black edges according to claim 4, characterized in that: The light injection preheating zone includes 6 to 7 third temperature zones, each of which is provided with at least 6 U-shaped heating lamps (6), and the power of the U-shaped heating lamps (6) is 1000 to 1800W.

8. The sintering furnace for improving EL defect of MCP tooth-shaped black edges according to any one of claims 3 to 7, characterized in that: The U-shaped heating lamp tubes (6) are arranged longitudinally along the side wall of the sintering furnace body.

9. The sintering furnace for improving the EL defect of MCP tooth-shaped black edges according to claim 8, characterized in that: In the same temperature zone, the distance between two adjacent U-shaped heating lamp tubes (6) increases as the power of the U-shaped heating lamp tubes (6) increases.

10. The sintering furnace for improving EL defect of MCP tooth-shaped black edges according to any one of claims 3 to 5, characterized in that: The diameter of the heating lamp tube (5) is 1-1.5 cm.

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