Conductive wire production equipment and solar cell fabrication method

Abstract

This application provides a conductive wire production apparatus and a method for fabricating a solar cell. The conductive wire production apparatus includes: a first channel having a first inlet and a first outlet, the first channel allowing a filamentous conductor to enter through the first inlet and exit through the first outlet; and a second channel having a second inlet and a second outlet, the second outlet surrounding the first outlet, the second channel allowing a coating material to enter through the second inlet and exit through the second outlet, the coating material exiting through the second outlet covering the outer peripheral surface of the filamentous conductor. The conductive wire of this application has the advantages of low cost and small width.

Description

Technical Field

[0001] The present application mainly relates to the field of photovoltaic technology, and in particular to a conductive wire production device and a method for preparing a solar cell. Background Art

[0002] The grid lines in solar cells play the role of conducting current. Methods for preparing grid lines include preparing grid lines using electroplating processes, preparing grid lines using screen printing processes, etc. The electroplating process has complex process steps and expensive equipment, and the width of the grid lines prepared by the screen printing process is relatively large. How to reduce the manufacturing cost of the grid lines and reduce the width of the grid lines is one of the important research directions in this field. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a conductive wire production device and a method for preparing a solar cell, wherein the conductive wires in the conductive wire production device and the method for preparing a solar cell have the advantages of low cost and small width.

[0004] To solve the above technical problems, the present application provides a conductive wire production device, comprising: a first channel, having a first feed port and a first discharge port, the first channel allowing a filamentary conductor to enter from the first feed port and be discharged from the first discharge port; a second channel, having a second feed port and a second discharge port, the second discharge port surrounding the first discharge port, the second channel allowing a coating material to enter from the second feed port and be discharged from the second discharge port, the coating material discharged through the second discharge port covering the outer peripheral surface of the filamentary conductor.

[0005] In one embodiment of the present application, the second channel includes two independent sub-channels, the second feed port includes two independent sub-feed ports, the second outlet port includes two independent sub-outlet ports, and each of the sub-channels is connected to a corresponding sub-feed port and sub-outlet port.

[0006] In one embodiment of the present application, the first discharge port is a triangle, one of the two sub-discharge ports is adjacent to one side of the triangle, and the other of the two sub-discharge ports is adjacent to the other two sides of the triangle.

[0007] In one embodiment of the present application, the first discharge port is triangular, circular, elliptical or trapezoidal.

[0008] In one embodiment of the present application, the coating material is a conductive paste or powdered metal particles. When the coating material is powdered metal particles, the conductive wire production device has the function of heating and melting the powdered metal particles.

[0009] In one embodiment of the present application, the conductive wire production device also includes a first filamentary conductor feeding unit, which includes a crucible, a heating device and a molding device. The crucible is used to hold raw materials for preparing the filamentary conductor, the heating device is used to heat the raw materials, the molding device is connected to the crucible, and the molding device is used to cool the raw materials and process the raw materials into a filamentary conductor with a predetermined cross-section.

[0010] In one embodiment of the present application, the conductive wire production device further includes a second filamentary conductor feeding unit, the second filamentary conductor feeding unit having a through hole, the through hole having an inlet and an outlet, and the cross-section of the through hole gradually changes from the inlet to the outlet.

[0011] In one embodiment of the present application, the conductive wire production device further includes a coating material feeding system, which is connected to the second feed port, wherein the coating material feeding system is used to provide the coating material to the second channel.

[0012] On the other hand, the present application also proposes a method for preparing a solar cell, comprising: providing a filamentary conductor to the first channel from a first feed port of the first channel, and discharging the filamentary conductor from a first discharge port of the first channel; providing a coating material to the second channel from a second feed port of the second channel, the second channel having a second discharge port surrounding the first discharge port, so that the coating material is discharged through the second discharge port and covers the outer peripheral surface of the filamentary conductor to form a conductive wire including a filamentary conductor and the coating material covering the outer peripheral surface of the filamentary conductor; and laying the conductive wire on a solar cell intermediate, heating the conductive wire to bond the conductive wire to the solar cell intermediate, wherein the conductive wire is electrically connected to the solar cell intermediate.

[0013] In one embodiment of the present application, the second channel includes two independent sub-channels, the second feed port includes two independent sub-feed ports, and the second outlet port includes two independent sub-outlet ports, each of the sub-channels is connected to the corresponding sub-feed port and sub-outlet, and different coating materials are provided to the two sub-channels, and the different coating materials respectively cover designated areas of the outer peripheral surface of the filamentary conductor.

[0014] In one embodiment of the present application, the cross-section of the filamentary conductor discharged through the first discharge port is triangular, and different coating materials respectively cover one side surface and the other two side surfaces of the filamentary conductor.

[0015] In one embodiment of the present application, the filamentary conductor is a metal wire including one or more of copper, silver, aluminum, and tin.

[0016] In one embodiment of the present application, the step of laying the conductive wire on the solar cell intermediate body includes: laying the conductive wire on the solar cell intermediate body through the first discharge port and the second discharge port.

[0017] In one embodiment of the present application, the method for heating the conductive wire includes: laser heating and drying heating.

[0018] In one embodiment of the present application, the step of laying the conductive wire on the solar cell intermediate body includes: embedding at least a portion of the conductive wire into an adhesive film, and placing the adhesive film in which the conductive wire is embedded on the solar cell intermediate body.

[0019] In an embodiment of the present application, the method for heating the conductive wire includes: heating the conductive wire during the process of laminating the adhesive film using a hot pressing process.

[0020] In one embodiment of the present application, the method for preparing a solar cell further includes: before placing the adhesive film embedded with the conductive wire on the solar cell intermediate, providing a layer of conductive paste on the surface where the conductive wire contacts the solar cell intermediate, wherein the conductive wire is completely embedded in the adhesive film and the top surface of the conductive wire is lower than the top surface of the adhesive film.

[0021] In one embodiment of the present application, the step of laying the conductive wire on the solar cell intermediate includes: embedding the conductive wire into an adhesive film, providing a layer of conductive paste on the surface where the conductive wire contacts the solar cell intermediate, and transferring the conductive wire onto the solar cell intermediate.

[0022] In one embodiment of the present application, the solar cell intermediate includes a transparent conductive layer, the conductive wire is laid on the transparent conductive layer, and the conductive wire is heated to make the conductive wire bond with the transparent conductive layer, wherein the conductive wire is electrically connected to the transparent conductive layer.

[0023] In one embodiment of the present application, the solar cell intermediate comprises a doping layer, a dielectric layer and a plurality of metal contacts, wherein the dielectric layer is located above the doping layer, and the plurality of metal contacts pass through the dielectric layer and are electrically connected to the doping layer, wherein the conductive wire is laid on the dielectric layer, and the conductive wire is heated so that the conductive wire is bonded to the dielectric layer and the plurality of metal contacts, and the conductive wire is electrically connected to the plurality of metal contacts.

[0024] Compared with the prior art, the present application has the following advantages: Since the present application prepares the conductive wire by covering the filamentary conductor with a coating material, the width of the conductive wire in the present application is smaller than the grid wire produced by the screen printing process. In addition, compared with the equipment used in the electroplating process, the cost of the conductive wire production device in the present application is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0026] Figure 1 is a cross-sectional schematic diagram of a conductive wire production device in one embodiment of the present application;

[0027] Figure 2 is a schematic diagram of a first discharge port and a second discharge port in an embodiment of the present application;

[0028] Figure 3 is a three-dimensional schematic diagram of a conductive wire production device in one embodiment of the present application;

[0029] Figure 4 is a schematic cross-sectional view of a conductive wire in an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of a first discharge port and a second discharge port in an embodiment of the present application;

[0031] Figure 6 is a schematic cross-sectional view of a conductive wire in another embodiment of the present application;

[0032] Figure 7 and Figure 8 is a structural schematic diagram of a filament conductor feeding unit in an embodiment of the present application;

[0033] Fig. 9 and Fig.10 is a structural schematic diagram of a filament conductor feeding unit in another embodiment of the present application;

[0034] Fig.11 is a schematic flow chart of a method for preparing a solar cell in one embodiment of the present application;

[0035] Figure 12 to Figure 14 is a schematic diagram of a process in which a conductive wire forms an electrical connection with a solar cell intermediate in one embodiment of the present application;

[0036] Figures 15 to 18 is a schematic diagram of a process of forming an electrical connection between a conductive wire and a solar cell intermediate body in another embodiment of the present application;

[0037] Figures 19 to 21 is a schematic diagram of a process of forming an electrical connection between a conductive wire and a solar cell intermediate body in another embodiment of the present application;

[0038] Fig. 22 and Fig.23 is a schematic diagram of the electrical connection between the conductive wire and the solar cell intermediate body in one embodiment of the present application;

[0039] Fig.24 and Fig.25 It is a schematic diagram of the electrical connection between the conductive wire and the solar cell intermediate body in another embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0041] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0046] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0047] Next, the conductive wire production device and the solar cell preparation method of the present application are described through examples.

[0048] refer to Figure 1 and Figure 2 As shown, the conductive wire production device includes a first channel 110 and a second channel 120. The first channel 110 has a first feed port 111 and a first discharge port 112 that are connected. The first channel 110 allows the filamentary conductor 130 to enter from the first feed port 111 and be discharged from the first discharge port 112. The second channel 120 has a second feed port 121 and a second discharge port 122 that are connected. The second channel 120 allows the coating material 140 to enter the second channel 120 from the second feed port 121, and the coating material 140 is discharged from the second channel 120 from the second discharge port 122. The second discharge port 122 surrounds the first discharge port 112, so that the coating material 140 discharged through the second discharge port 122 can cover the outer peripheral surface of the filamentary conductor 130. "The second discharge port 122 surrounds the first discharge port 112" means that the second discharge port 122 surrounds the entire first discharge port 112 (such as Figure 2 As shown), it should be noted that “the second discharge port 122 substantially surrounds the entire first discharge port 112” is also within the protection scope of the present application.

[0049] refer to Figure 2 and Figure 3 As shown, the first discharge port 112 is triangular, and the first discharge port 112 may also be circular, elliptical or trapezoidal, etc. The second discharge port 122 is a closed annular ring surrounding the first discharge port 112, and the coating material 140 can cover the outer peripheral surface of the filamentary conductor 130 after being discharged through the second discharge port 122. The second discharge port 122 may also be other shapes.

[0050] exist Figure 3 In the embodiment, the cross section of the filamentary conductor 130 is a triangle, and the cross section of the filamentary conductor 130 may also be other shapes, such as a circle, an ellipse, a rectangle or a trapezoid. The first channel 110 may have a shaping function. Specifically, for a filamentary conductor 130 having a cross-sectional shape different from that of the first discharge port 112, during the process of the filamentary conductor 130 moving from the first feed port 111 to the first discharge port 112, the first channel 110 can make the cross-sectional shape of the filamentary conductor 130 when being discharged the same as that of the first discharge port 112. The first channel 110 can achieve the above-mentioned shaping function by gradually changing its cross-sectional shape.

[0051] The filament conductor 130 may be a metal wire including one or more of silver, copper, aluminum, and tin.

[0052] The coating material 140 has certain fluidity and adhesion when discharged from the second discharge port 122, so that it can adhere to the filamentary conductor 130. After the coating material 140 is cooled and solidified, it can be made fluid and adhesive again by heating. The coating material 140 can be a conductive paste used in the traditional technology to prepare solar cell grid lines, and the conductive paste can include one or more of silver particles, copper particles, aluminum particles, and tin particles. The coating material 140 can also be powdered metal particles. In this case, the conductive wire production device has a heating function to heat and melt the powdered metal particles. The melted powdered metal particles are discharged through the second discharge port 122 and cover the outer peripheral surface of the filamentary conductor 130.

[0053] refer to Figure 3 and Figure 4 As shown, the conductive wire 150 prepared by the conductive wire production device includes a substrate 151 and a coating layer 152, and the coating layer 152 covers the outer peripheral surface of the substrate 151. It can be understood that the substrate 151 is formed by the filamentary conductor 130, and the coating layer 152 is formed by the coating material 140. Figure 1 and Figure 4 As shown, the conductive wire production device can lay the conductive wire 150 on the solar cell intermediate 160, and can heat the conductive wire 150 to make it bonded to the solar cell intermediate 160 and to form an electrical connection with the solar cell intermediate 160. The heating also has the function of curing the coating layer 152.

[0054] The width of the conductive wire 150 can be controlled by adjusting the size of the filament conductor 130 and the thickness of the coating material 140. The "width" refers to the width of the projection of the conductive wire 150 on the solar cell intermediate body 160 in a direction perpendicular to the solar cell intermediate body 160. Thanks to the fact that the conductive wire 150 is prepared by covering the coating material 140 on the filament conductor 130, the width of the conductive wire 150 prepared by the present application is smaller than the grid line produced by the screen printing process. In addition, compared with the equipment used in the electroplating process, the cost of the conductive wire production device of the present application is lower.

[0055] refer to Figure 5 As shown, the second channel includes two independent sub-channels, the second feed port includes two independent sub-feed ports, the second discharge port 122 includes two independent sub-discharge ports 122a and 122b, each sub-channel is connected to the corresponding sub-feed port and sub-discharge port, and the sub-discharge ports 122a and 122b are distributed around the first discharge port 112. The two sub-channels in the second channel are not connected to each other, and two different coating materials can be provided to the two sub-channels, and the two different coating materials are discharged from the sub-discharge ports 122a and 122b respectively, so that different coating materials can be coated on a specified area of ​​the outer peripheral surface of the filament-shaped conductor 130.

[0056] Continue to refer Figure 5 As shown, the first outlet 112 is a triangle, the sub-outlet 122a is adjacent to the base of the triangle, and the sub-outlet 122b is adjacent to the two sides of the triangle. The coating material discharged from the sub-outlet 122a covers one side of the filament conductor, and the coating material discharged from the sub-outlet 122b covers the other two sides of the filament conductor. Figure 6 As shown, thanks to the design of the above-mentioned two independent sub-channels, for the conductive wire 150 with a triangular cross-section, a first coating layer 153 that is easy to form an electrical connection with the solar cell intermediate 160 can be formed on the side where the conductive wire 150 contacts the solar cell intermediate 160, and a highly reflective second coating layer 154 is formed on the other two sides. The second coating layer 154 can reflect incident light to the solar cell intermediate 160, thereby improving the utilization rate of the incident light by the solar cell.

[0057] refer to Figure 1 As shown, in one embodiment, the first channel 110 extends in a straight line, and a cross section of the second channel 120 at any position in the vertical direction (a cross section in the horizontal direction) is a closed shape (eg, a ring) and surrounds the first channel 110 .

[0058] refer to Figure 7 and Figure 8 As shown, in one embodiment, the conductive wire production device further includes a first filamentary conductor feeding unit 170, which includes a crucible 171, a heating device 172, and a molding device 173. The crucible 171 is used to hold raw materials for preparing the filamentary conductor 130, the heating device 172 is used to heat and melt the raw materials in the crucible 171, and the molding device 173 is connected to the crucible 171. The molding device 173 is used to cool the raw materials and process the raw materials into a filamentary conductor 130 with a predetermined cross section. Figure 7 In the embodiment of the present invention, the heating device 172 is a heating wire surrounding the crucible 171. The heating device 172 of the present application is not limited to a heating wire, but may be any other heating device capable of heating and melting the raw materials in the crucible 171. The forming device 173 has a cooling function and also has an outlet 173a with a predetermined cross-sectional shape. When the molten raw material flows through the forming device 173, the forming device 173 cools and processes the molten raw material into a filament conductor 130 with a predetermined cross-sectional shape. Figure 8 In the figure, the predetermined cross section is a triangle (it can be understood that the outlet 173a is also a triangle), and the predetermined cross section can also be other shapes, such as a circle, an ellipse, a rectangle or a trapezoid.

[0059] The first filament-shaped conductor feeding unit 170 can provide the prepared filament-shaped conductor 130 into the first channel 110 through the first feeding port 111 .

[0060] refer to Fig. 9 and Fig.10 As shown, in one embodiment, the conductive wire production device further includes a second wire-shaped conductor feeding unit 180, which has a through hole, and the through hole has an inlet 181 and an outlet 182, and the cross section of the through hole gradually changes from the inlet 181 to the outlet 182. In this way, the through hole can extrude the metal wire fed from the inlet 181 into a wire-shaped conductor with a triangular cross section. Fig. 9 and Fig.10 In the embodiment of the present invention, the predetermined cross section is a triangle, and the predetermined cross section may also be other shapes, such as a circle, an ellipse, a rectangle, a trapezoid, etc.

[0061] The filamentary conductor 130 prepared by the second filamentary conductor feeding unit 180 may enter the first channel 110 through the first feeding port 111 .

[0062] In one embodiment, the conductive wire production device further includes a coating material feeding system, which is connected to the second feed port and is used to provide the coating material to the second channel.

[0063] On the other hand, the present application also proposes a method for preparing a solar cell, referring to Fig.11 As shown, the method for preparing a solar cell includes the following steps S210 to S230.

[0064] Step S210: providing a filamentary conductor to the first channel from a first feed port of the first channel, and discharging the filamentary conductor from a first discharge port of the first channel;

[0065] Step S220: providing a coating material to the second channel from a second feed port of the second channel, wherein the second channel has a second discharge port surrounding the first discharge port, so that the coating material is discharged through the second discharge port and covers the outer peripheral surface of the filamentary conductor, so as to form a conductive wire including the filamentary conductor and the coating material covering the outer peripheral surface of the filamentary conductor;

[0066] Step S230: Laying the conductive wire on the solar cell intermediate, and heating the conductive wire to make the conductive wire bonded to the solar cell intermediate, wherein the conductive wire is electrically connected to the solar cell intermediate.

[0067] Next, steps S210 to S230 are described in detail.

[0068] refer to Figure 1 As shown, in step S210, the first inlet 111 of the first channel 110 provides the filamentary conductor 130 to the first channel 110, and the filamentary conductor 130 is discharged from the first outlet 112 of the first channel 110. Figure 7 and Fig. 9The illustrated filamentary conductor feeding unit prepares the filamentary conductor 130 and provides the filamentary conductor 130 to the first channel 110 .

[0069] refer to Figures 1 to 4 As shown, in step S220, the coating material 140 is provided to the second channel 120 by the second feed port 121 of the second channel 120, and the second channel 120 has a second discharge port 122 surrounding the first discharge port 112, so that the coating material 140 is discharged through the second discharge port 122 and covers the outer peripheral surface of the filamentary conductor 130 to form a conductive wire 150 including the filamentary conductor 130 and the coating material 140, and the coating material 140 covers the outer peripheral surface of the filamentary conductor 130, wherein the filamentary conductor 130 constitutes a substrate 151 of the conductive wire 150, and the coating material 140 constitutes a coating layer 152 of the conductive wire 150.

[0070] refer to Figure 5 As shown, in one embodiment, the second channel includes two mutually independent sub-channels, the second feed port includes two mutually independent sub-feed ports, the second discharge port 122 includes two mutually independent sub-discharge ports 122a, each sub-channel is connected to the corresponding sub-feed port and the sub-discharge ports 122a and 122b, and the sub-discharge ports 122a and 122b are distributed around the first discharge port 112. The two sub-channels are not connected to each other, and two different coating materials are provided to the two sub-channels, and the two different coating materials are discharged from the sub-discharge ports 122a and 122b respectively, so that different coating materials can be coated on a specified area of ​​the outer peripheral surface of the filament-shaped conductor 130.

[0071] Continue to refer Figure 5 As shown, the first discharge port 112 is a triangle, and the cross section of the filament conductor discharged through the first discharge port 112 is also a triangle (the outer peripheral surface of the filament conductor has three sides), the sub-discharge port 122a is adjacent to the base of the triangle, and the sub-discharge port 122b is adjacent to the two sides of the triangle. The coating material discharged from the sub-discharge port 122a covers one side of the filament conductor, and the coating material discharged from the sub-discharge port 122b covers the other two sides of the filament conductor.

[0072] In one embodiment, the filament conductor 130 may be a metal wire including one or more of silver, copper, aluminum, and tin.

[0073] refer to Figure 1As shown, in step S230, the conductive wire 150 is laid on the solar cell intermediate 160, and the conductive wire 150 is heated so that the conductive wire 150 is bonded to the solar cell intermediate 160, and the conductive wire 150 is also electrically connected to the solar cell intermediate 160. The solar cell intermediate 160 refers to a solar cell that has not been metallized (i.e., a solar cell that has not formed a grid line). After the conductive wire 150 is electrically connected to the solar cell intermediate 160, the solar cell intermediate 160 is processed into a solar cell that can work normally, and the conductive wire 150 can collect the current in the solar cell and export the current to the outside.

[0074] refer to Figure 1 As shown, in one embodiment, the step of laying the conductive wire 150 on the solar cell intermediate 160 includes: laying the conductive wire 150 directly on the solar cell intermediate 160 through the first outlet 112 and the second outlet 122, and the method of heating the conductive wire 150 includes: using laser heating or drying heating.

[0075] Figure 12 to Figure 14 Schematic diagram of the process of forming an electrical connection between a conductive wire and a solar cell intermediate body in one embodiment. Figure 12 to Figure 14 As shown, the step of laying the conductive wire 150 on the solar cell intermediate 160 includes: embedding at least a portion of the conductive wire 150 into an adhesive film 190, and then placing the adhesive film 190 on the solar cell intermediate 160, wherein the side where the conductive wire 150 is located faces the solar cell intermediate 160. The adhesive film 190 can be an adhesive film used in conventional technology to prepare solar cell laminates. The method for heating the conductive wire 150 includes: heating the conductive wire 150 during the process of pressing the adhesive film 190 using a hot pressing process. In detail, in the process of preparing the solar cell laminate, the adhesive film 190 is placed on the solar cell intermediate 160, and the glass 210 is placed on the adhesive film 190, and the solar cell intermediate 160, the adhesive film 190 and the glass 210 are pressed together by a hot pressing process. As shown in FIG. Fig.14 As shown, during the hot pressing process, the coating layer in the conductive wire 150 is melted by heat, and the melted coating layer is bonded to the solar cell intermediate body 160 to form an electrical connection.

[0076] Figures 15 to 18 FIG. 1 is a schematic diagram of another embodiment of a process of forming an electrical connection between a conductive wire and a solar cell intermediate body. Fig.15 and Fig.16As shown, the step of laying the conductive wire 150 on the solar cell intermediate body 160 includes: completely embedding the conductive wire 150 in the adhesive film 190, and the top surface of the conductive wire 150 is lower than the top surface of the adhesive film 190, and before placing the adhesive film 190 on the solar cell intermediate body 160, a layer of conductive paste 220 is provided on the top surface of the conductive wire 150, and the conductive paste 220 can be a paste containing one or more of silver particles, copper particles, aluminum particles, and tin particles. Next, refer to Figures 16 to 18 As shown, Fig.16 The adhesive film 190 is placed on both sides of the solar cell intermediate 160, with the side where the conductive paste 220 is located facing the solar cell intermediate 160, and the glass 210 is placed on the adhesive film 190, and the solar cell intermediate 160, the adhesive film 190 and the glass 210 are pressed together through a hot pressing process. During the hot pressing process, the conductive paste 220 is bonded to the solar cell intermediate 160 and forms an electrical connection. In the case where the coating layer 152 in the conductive wire 150 cannot be melted during the hot pressing process, the conductive paste 220 helps to form a stable and reliable bond and electrical connection between the conductive wire 150 and the solar cell intermediate 160.

[0077] Figures 19 to 21 FIG. 1 is a schematic diagram of a process in which a conductive wire forms an electrical connection with a solar cell intermediate body in another embodiment. Figures 19 to 21 As shown, the conductive wire 150 is embedded in the adhesive film 190, a layer of conductive paste 220 is disposed on the surface of the conductive wire 150 in contact with the solar cell intermediate 160, and the conductive wire 150 is transferred to the solar cell intermediate 160, so that the conductive wire 150 is electrically connected to the solar cell intermediate 160. The transfer process includes placing the adhesive film 190 embedded with the conductive wire 150 on the solar cell intermediate 160, the conductive paste 220 is in contact with the solar cell intermediate 160, heating the conductive wire 150 and the conductive paste 220, connecting the conductive paste 220 and the solar cell intermediate 160 together, and then removing the adhesive film 190.

[0078] Fig. 22 and Fig.23 is a schematic diagram of an embodiment of an electrical connection between a conductive wire and a solar cell intermediate body, Fig.23 yes Fig. 22 Schematic diagram of the cross section along line AA. Fig. 22 and Fig.23 As shown, the solar cell intermediate 160 includes a transparent conductive layer 161 , the conductive wire 150 is laid on the transparent conductive layer 161 , and the conductive wire 150 is heated to make the conductive wire 150 adhere to the transparent conductive layer 161 , and the conductive wire 150 and the transparent conductive layer 161 are electrically connected.

[0079] Fig.24 and Fig.25is a schematic diagram of another embodiment of the electrical connection between the conductive wire and the solar cell intermediate body, Fig.25 yes Fig.24 Schematic cross-sectional view along line BB. Fig.24 and Fig.25 As shown, the solar cell intermediate includes a doping layer 162, a dielectric layer 163 and a plurality of metal contacts 164, the doping layer 162 may be an N-type doped silicon layer or a P-type doped silicon layer, the dielectric layer 163 is located above the doping layer 162, the dielectric layer 163 may be a passivation anti-reflection layer, a plurality of metal contacts 164 are arranged at intervals, the metal contacts 164 pass through the dielectric layer 163 and are electrically connected to the doping layer 162, a conductive wire 150 is laid on the dielectric layer 163, the conductive wire 150 is heated so that the conductive wire 150 is bonded to the dielectric layer 163 and the plurality of metal contacts 164, and the conductive wire 150 is electrically connected to the plurality of metal contacts 164.

[0080] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0081] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0082] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0083] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which can be changed according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the method of general digit retention. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0084] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A conductive wire production device, characterized in that: include: A first channel having a first feed port and a first discharge port, wherein the first channel allows the filament conductor to enter through the first feed port and be discharged through the first discharge port; A second channel has a second feed port and a second discharge port, the second discharge port surrounds the first discharge port, the second channel allows the coating material to enter from the second feed port and be discharged from the second discharge port, the coating material discharged from the second discharge port covers the outer peripheral surface of the filamentary conductor, wherein the second channel includes two sub-channels that are not connected to each other, and two different coating materials are provided through the two sub-channels, the second feed port includes two independent sub-feed ports, the second discharge port includes two independent sub-discharge ports, each of the sub-channels is connected to the corresponding sub-feed port and sub-discharge port, the first discharge port is a triangle, one of the two sub-discharge ports is adjacent to one side of the triangle, and the other of the two sub-discharge ports is adjacent to the other two sides of the triangle.

2. The conductive wire production device according to claim 1, characterized in that: The first discharge port is triangular, circular, elliptical or trapezoidal.

3. The conductive wire production device according to claim 1, characterized in that: The coating material is conductive paste or powdered metal particles. When the coating material is powdered metal particles, the conductive wire production device has the function of heating and melting the powdered metal particles.

4. The conductive wire production device according to claim 1, characterized in that: It also includes a first filamentary conductor feeding unit, which includes a crucible, a heating device and a molding device. The crucible is used to hold raw materials for preparing the filamentary conductor, the heating device is used to heat the raw materials, the molding device is connected to the crucible, and the molding device is used to cool the raw materials and process the raw materials into a filamentary conductor with a predetermined cross-section.

5. The conductive wire production device according to claim 1, characterized in that: It also includes a second wire-shaped conductor feeding unit, wherein the second wire-shaped conductor feeding unit has a through hole, wherein the through hole has an inlet and an outlet, and a cross section of the through hole gradually changes from the inlet to the outlet.

6. The conductive wire production device according to claim 1, characterized in that: It also includes a coating material feeding system, which is connected to the second feed port, wherein the coating material feeding system is used to provide the coating material to the second channel.

7. A method for preparing a solar cell, characterized in that: include: Providing a filamentary conductor to the first channel from a first feed port of the first channel, and discharging the filamentary conductor from a first discharge port of the first channel; The second channel is provided with a coating material from a second feed port of the second channel, the second channel has a second discharge port surrounding the first discharge port, so that the coating material is discharged through the second discharge port and covers the outer peripheral surface of the filamentary conductor, so as to form a conductive wire including the filamentary conductor and the coating material covering the outer peripheral surface of the filamentary conductor; as well as The conductive wire is laid on a solar cell intermediate and heated to bond the conductive wire to the solar cell intermediate, wherein the conductive wire is electrically connected to the solar cell intermediate, wherein the second channel includes two sub-channels that are not connected to each other, the second feed port includes two independent sub-feed ports, the second discharge port includes two independent sub-discharge ports, each of the sub-channels is connected to a corresponding sub-feed port and sub-discharge port, different coating materials are provided to the two sub-channels, and the different coating materials respectively cover designated areas of the outer peripheral surface of the filamentary conductor, the cross-section of the filamentary conductor discharged through the first discharge port is a triangle, and different coating materials respectively cover one side and the other two sides of the filamentary conductor.

8. The method for preparing a solar cell according to claim 7, characterized in that: The filamentary conductor is a metal wire including one or more of copper, silver, aluminum and tin.

9. The method for preparing a solar cell according to claim 7, characterized in that: The step of laying the conductive wire on the solar cell intermediate body includes: laying the conductive wire on the solar cell intermediate body through the first discharge port and the second discharge port.

10. The method for preparing a solar cell according to claim 9, characterized in that: The method for heating the conductive wire includes: laser heating and drying heating.

11. The method for preparing a solar cell according to claim 7, characterized in that: The step of laying the conductive wire on the solar cell intermediate body includes: embedding at least a portion of the conductive wire into an adhesive film, and placing the adhesive film embedding the conductive wire on the solar cell intermediate body.

12. The method for preparing a solar cell according to claim 11, characterized in that: The method for heating the conductive wire includes: heating the conductive wire during the process of laminating the adhesive film using a hot pressing process.

13. The method for preparing a solar cell according to claim 11, characterized in that: Also includes: Before placing the adhesive film embedded with the conductive wire on the solar cell intermediate, a layer of conductive paste is provided on the surface of the conductive wire in contact with the solar cell intermediate, wherein the conductive wire is completely embedded in the adhesive film and the top surface of the conductive wire is lower than the top surface of the adhesive film.

14. The method for preparing a solar cell according to claim 7, characterized in that: The step of laying the conductive wire on the solar cell intermediate includes: embedding the conductive wire into an adhesive film, providing a layer of conductive paste on the surface of the conductive wire in contact with the solar cell intermediate, and transferring the conductive wire to the solar cell intermediate.

15. The method for preparing a solar cell according to claim 7, characterized in that: The solar cell intermediate comprises a transparent conductive layer, the conductive wire is laid on the transparent conductive layer, and the conductive wire is heated to make the conductive wire bond with the transparent conductive layer, wherein the conductive wire is electrically connected with the transparent conductive layer.

16. The method for preparing a solar cell according to claim 7, characterized in that: The solar cell intermediate includes a doping layer, a dielectric layer and a plurality of metal contacts, wherein the dielectric layer is located above the doping layer, and the plurality of metal contacts are electrically connected to the doping layer through the dielectric layer, wherein the conductive wire is laid on the dielectric layer, and the conductive wire is heated so that the conductive wire is bonded to the dielectric layer and the plurality of metal contacts, and the conductive wire is electrically connected to the plurality of metal contacts.

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