Solar cell string and manufacturing method thereof

Abstract

The invention relates to a solar cell string and a manufacturing method thereof. The manufacturing method of the solar cell string comprises the following steps: printing a plurality of fixed glue points which are arranged at intervals along a first direction and a second direction on the surface of a cell; the conductive part is pulled to pass through the soldering flux groove and is soaked in the soldering flux of the soldering flux groove, so that a soldering flux layer is formed on the periphery of the conductive part; pulling the conductive part out of the soldering flux groove, and removing a soldering flux layer at a preset position on the conductive part by adopting a heating device so as to expose the outer wall of the conductive part to form an adhesive area corresponding to the fixed adhesive point; and pressing the conductive part on the battery piece along the first direction, bonding the conductive part with the fixed glue point in the adhesive area, and welding and fixing the conductive part in the area, except the fixed glue point, of the battery piece through the soldering flux layer. Therefore, the soldering flux layer on the conductive part cannot be in contact with the fixed glue point, so that the bonding force of the fixed glue point for bonding and connecting the conductive part and the battery piece is increased, and the tension value meets the requirement.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and particularly to a solar cell string and a manufacturing method thereof. Background Art

[0002] With the continuous development of solar cell string technology, the number of busbars on the cell has gone through MBB (Multi-Busbar) and SMBB (i.e., Super MBB). The multi-busbar technology in photovoltaics is a method for improving the design and manufacturing of photovoltaic cells, which improves the performance and efficiency of the cells by adding more busbars on the cell surface. Conventional solar cell strings usually use 2 to 5 busbars, while the multi-busbar technology can use 9 or more busbars. The multi-busbar technology evenly distributes more busbars on the cell surface, usually 9 or more, and these busbars are used to collect and conduct the photo-generated current.

[0003] More busbars disperse the current, reducing the current density of each busbar, thereby reducing the ohmic loss (resistance loss), increasing the fill factor and overall efficiency of the cell. The multi-busbar structure helps to evenly distribute the current and reduce the hot-spot effect, thereby improving the long-term reliability and performance of the module. After the number of busbars increases, the width of a single busbar can be reduced. Due to the fine busbar design, the multi-busbar technology reduces the shading area on the surface of the solar cell string, allowing more light to reach the silicon wafer surface and increasing the photoelectric conversion efficiency.

[0004] The busbarless technology (abbreviated as 0BB) is a currently emerging solar cell string manufacturing technology, which improves the efficiency of solar cells and reduces costs. In crystalline silicon solar cells, busbars are metal lines used to collect current, and there are usually multiple busbars. The busbarless technology eliminates these busbars and instead uses thinner metal lines or conductive materials to collect current. The 0BB process eliminates the busbars and sub-busbars in the metal electrode screen printing process and optimizes the width and spacing of the sub-busbars. The advantages of 0BB are cost reduction, silver reduction, and efficiency increase. In the cell stage, compared with SMBB, 0BB can save about 30% of silver paste, glue film, and about 10% of solder tape; in the module stage, 0BB uses a low-temperature welding process and ultra-fine and ultra-flexible solder tape, which helps to improve the welding yield of the module. The use of ultra-fine and ultra-flexible solder tape can collect more current, shorten the current transmission distance, and increase the module power.

[0005] At present, there are mainly two design forms for the 0BB grid line design. (1) There are no welding pads on all grid lines, and metal wires are fixed entirely by adhesives. (2) One welding pad is reserved at each of the head and tail of the grid line, and adhesives are used in the middle to fix the metal wires. Based on the significant changes in the appearance characteristics of the 0BB grid line compared to the MBB and SMBB grid lines, the grid line is completely canceled or nearly canceled, and actually it is generally referred to as the 0BB technology.

[0006] Before welding the 0BB battery, the metal wire is soaked entirely in the flux. Synchronously, the welding pads at the head and tail of the battery grid line + the middle adhesive, or the entire grid line is all adhesives. During actual welding, the welding tensile strength at the welding pad position is qualified (the welding pad is mainly composed of metal paste), but the tensile strength value at the adhesive position does not meet the standard requirements. This is because the acidic components in the flux will inhibit the activity of the catalytic components in the adhesive, and moreover, the acidic components in the flux will form an alloy coating on the surface of the metal wire, reducing the bonding force between the adhesive and the metal wire. Summary of the Invention

[0007] Based on this, it is necessary to provide a solar cell string and a photovoltaic module for the problem of insufficient adhesive tensile strength caused by the current method of obtaining a flux layer by fully soaking the metal wire and applying it to the non-main grid adhesive process of the battery cell, which can make the tensile strength value of the fixed glue points connecting the conductive components and the battery cell meet the requirements, effectively improve the welding reliability, and ensure the reliability of the connection between the conductive components and the battery cell.

[0008] A manufacturing method of a solar cell string includes:

[0009] Printing a plurality of fixed glue points on the surface of the battery cell, which are arranged at intervals along the first direction and the second direction;

[0010] Trapping the conductive component through a flux tank and soaking it in the flux in the flux tank to form a flux layer on the outer periphery of the conductive component;

[0011] Pulling the conductive component out of the flux tank, and using a heating device to remove the flux layer at a preset position on the conductive component to expose the outer wall of the conductive component to form an adhesive area corresponding to the fixed glue points;

[0012] Pressing the conductive component along the first direction onto the battery cell, bonding and connecting the conductive component with the fixed glue points in the adhesive area, and at the same time welding and fixing the conductive component to the area of the battery cell other than the fixed glue points through the flux layer.

[0013] In an embodiment of the present application, the number of the heating devices is multiple, and the multiple heating devices heat the preset position on the conductive component simultaneously;

[0014] The heating temperature range of the heating device is 80°C to 200°C.

[0015] In an embodiment of the present application, a plurality of the heating devices are arranged at intervals along the second direction, and each of the heating devices corresponds to one of the conductive components;

[0016] Alternatively, a plurality of the heating devices are arranged in rows and columns along the first direction and the second direction, and each of the conductive components corresponds to at least two of the heating devices.

[0017] In an embodiment of the present application, the heating device heats by a non-contact heating method;

[0018] Removing the solder flux layer at a preset position on the conductive component by using the heating device includes:

[0019] After the heating device receives a heating signal, the heating device emits heating light rays towards the conductive component;

[0020] The heating light rays heat the preset position on the conductive component, causing the solder flux layer at the preset position to volatilize, so as to form the adhesive area at the position on the conductive component corresponding to the preset position.

[0021] In an embodiment of the present application, the heating device heats the preset position on the conductive component by emitting disposable heating light rays;

[0022] Alternatively, during the traction process of the conductive component, the heating device continuously heats the preset position on the conductive component.

[0023] In an embodiment of the present application, the heating device heats by a contact heating method, and the end of the heating device has a contact heating element;

[0024] Removing the solder flux layer at a preset position on the conductive component by using the heating device includes:

[0025] After the conductive component is pulled in place, the heating device is driven to move so that the contact heating element abuts against the preset position on the conductive component;

[0026] The contact heating element is controlled to heat the preset position, causing the solder flux layer at the preset position to volatilize, so as to form the adhesive area at the position on the conductive component corresponding to the preset position.

[0027] In an embodiment of the present application, the contact heating element is arranged in a U shape, a Y shape or an arc shape;

[0028] And / or, the number of the contact heating elements is greater than or equal to the number of the fixed glue points.

[0029] In one embodiment of the present application, the heating device is vertically arranged on the conductive component;

[0030] Alternatively, the heating device is arranged obliquely relative to the conductive component.

[0031] In one embodiment of the present application, the solar cell string is manufactured in a welding device, the welding device includes a left channel structure and a right channel structure, and can act synchronously;

[0032] The manufacturing method further comprises the following steps:

[0033] In the right channel structure:

[0034] According to the design of the photovoltaic module, the solar cells of different sizes are selected and used;

[0035] Printing the fixed glue dots on the surface of the battery cell;

[0036] The battery sheet after printing the fixed glue dots is transported to the robot arm suction cup area via a conveyor belt;

[0037] The robot arm suction cup grabs the battery sheet to the welding position of the left channel structure;

[0038] In the left channel structure:

[0039] Loading the conductive component;

[0040] The conductive component is pulled through the flux tank to achieve full immersion;

[0041] After the conductive component is pulled out of the soldering flux groove, the heating device heats the preset position of the conductive component to volatilize the soldering flux layer at the preset position;

[0042] Pulling the conductive component to the top of the battery cell at the welding position so that the conductive component and the battery cell are in physical contact;

[0043] Using welding wire mesh to press the conductive component and the battery cell;

[0044] The welding mechanism heats and welds, and the flux layer welds and connects the conductive component and the battery cell. The fixed glue point begins to solidify under heating to bond and connect the adhesive area of ​​the conductive component, the fixed glue point and the battery cell.

[0045] A solar cell string manufactured by the manufacturing method of a solar cell string according to any of the above technical features;

[0046] The solar cell string includes solar cells, a plurality of fixing glue dots, conductive components, and a plurality of soldering aid coatings. The plurality of fixing glue dots are arranged on the solar cells at intervals in a first direction and a second direction;

[0047] The plurality of soldering aid coatings are arranged on the conductive components at intervals in the first direction. An adhesive area is formed on the outer wall of the conductive components between two adjacent soldering aid layers, and the adhesive area is arranged corresponding to the fixing glue dots;

[0048] The conductive components are fixed to the surface of the solar cells by welding through the soldering aid layers, and the conductive components are adhesively connected to the fixing glue dots in the adhesive area.

[0049] After adopting the above technical solution, the present application has at least the following technical effects:

[0050] For the solar cell string and its manufacturing method of the present application, in the manufacturing method of the solar cell string, a plurality of fixing glue dots arranged at intervals in a first direction and a second direction are printed on the surface of the solar cells. The conductive components are pulled into a soldering aid tank, and the conductive components can be immersed in the soldering aid in the soldering aid tank so that the soldering aid coats the outside of the conductive components to form soldering aid layers. The conductive components are pulled out of the soldering aid tank, and a heating device is used to remove the soldering aid layers at preset positions on the conductive components to expose the outer walls of the conductive components at the preset positions, forming an adhesive area corresponding to the fixing glue dots, and there is no soldering aid layer in the adhesive area. After the conductive components are pressed on the solar cells in the first direction, the conductive components are adhesively connected to the fixing glue dots in the adhesive area. At the same time, the conductive components are fixed to the areas other than the fixing glue dots on the solar cells by welding through the soldering aid layers.

[0051] After the conductive components fix the solar cells by welding and adhesion, the soldering aid layers can help the conductive components to be fixed to the solar cells by welding, increasing the firmness of the connection between the conductive components and the solar cells. At the same time, the soldering aid layers on the conductive components do not contact the fixing glue dots, so as to increase the adhesive force of the fixing glue dots connecting the conductive components and the solar cells, so that the tensile value of the fixing glue dots connecting the conductive components and the solar cells meets the requirements, effectively improving the reliability of welding, ensuring the reliability of the connection between the conductive components and the solar cells, avoiding problems such as poor soldering and low power between the conductive components and the solar cells, and ensuring the service performance of the photovoltaic module. Description of the Drawings

[0052] Figure 1 It is a process flow chart of the solar cell string according to an embodiment of the present application.

[0053] Figure 2 It is a structural schematic diagram of the conductive components with soldering aid layers formed during the manufacturing process of the solar cell string according to an embodiment of the present application.

[0054] Figure 3Schematic diagram of forming a conductive component with a flux layer during the manufacturing process of a solar cell string according to another embodiment of the present application.

[0055] Figure 4 Schematic diagram of a solar cell string according to an embodiment of the present application.

[0056] Figure 5 is Figure 4 Partial enlarged view of the solar cell string shown at A.

[0057] Figure 6 is Figure 5 Corresponding schematic diagram of the conductive component, the cell, and the fixing glue points in the solar cell string shown.

[0058] Figure 7 is Figure 5 Corresponding schematic diagram of the fixing glue points and the conductive component in the solar cell string shown.

[0059] Figure 8 is Figure 7 Schematic diagram of the cooperation between the fixing glue points and the conductive component shown.

[0060] Figure 9 Schematic diagram of a solar cell string according to another embodiment of the present application.

[0061] Figure 10 is Figure 9 Partial enlarged view of the solar cell string shown at B.

[0062] Figure 11 is Figure 10 Corresponding schematic diagram of the fixing glue points and the conductive component shown.

[0063] Figure 12 is Figure 11 Schematic diagram of the cooperation between the fixing glue points and the conductive component shown.

[0064] Figure 13 is Figure 3 Schematic diagram of the heating device shown.

[0065] Wherein: 100, solar cell string; 110, cell; 111, conductive region; 112, conductive layer; 113, welding pad; 120, fixing glue point; 130, conductive component; 131, welding region; 132, adhesive region; 133, conductive substrate; 134, metal coating; 140, soldering aid portion; 200, welding equipment; 210, flux tank; 220, heating device; 221, contact heating member; 230, pressing roller; 240, traction mechanism; 250, guide post. Detailed implementation manner

[0066] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0067] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0068] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0069] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "coupled", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0070] In this application, unless otherwise clearly specified and defined, if a first feature is described as "on" or "under" a second feature or the like, its meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0071] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0072] It can be understood that the busbarless technology (abbreviated as 0BB) uses more and finer metal wires or conductive materials to collect current. Before battery welding, the metal wires are soaked entirely in flux. Synchronously, the head and tail welding pads of the battery grid lines + the intermediate adhesive, or the entire grid line is all adhesive. During actual welding, the welding tensile strength at the welding pad position is qualified (the welding pad is mainly composed of metal paste components), but the tensile strength value at the adhesive position does not meet the standard requirements. This is because the acidic components present in the flux will inhibit the activity of the catalytic components in the adhesive, and moreover, the acidic components present in the flux will form an alloy coating on the surface of the metal wire, reducing the adhesion between the adhesive and the metal wire.

[0073] For this reason, referring to Figures 1 to 3 , this application provides a manufacturing method for a solar cell string 100. Figure 1 is a process flow chart of a solar cell string 100 according to an embodiment of this application, Figure 2 is a schematic structural diagram of a conductive component 130 with a flux layer formed during the manufacturing process of a solar cell string 100 according to an embodiment of this application, Figure 3 is a schematic structural diagram of a conductive component 130 with a flux layer formed during the manufacturing process of a solar cell string 100 according to another embodiment of this application. This application manufactures a solar cell string 100 using the manufacturing method of the solar cell string 100, and after encapsulating the solar cell string 100 using an encapsulation process, a photovoltaic module (not shown) can be formed.

[0074] The manufacturing method of the solar cell string 100 of the present application can avoid the solder flux layer of the conductive component 130 from inhibiting the activity of the catalytic component in the fixing glue point 120, increase the bonding force between the conductive component 130 and the fixing glue point 120, make the tensile value of the fixing glue point 120 connecting the conductive component 130 and the cell 110 meet the requirements, effectively improve the welding reliability, ensure the connection reliability between the conductive component 130 and the cell 110, avoid problems such as poor soldering and low power between the conductive component 130 and the cell 110, so as to ensure the service performance of the photovoltaic module.

[0075] To better illustrate the manufacturing method of the solar cell string 100, the structure of the solar cell string 100 and the equipment for manufacturing the solar cell string 100 will be briefly introduced here. Refer to Figures 2 to 6 , Figure 4 is a schematic diagram of the solar cell string 100 according to an embodiment of the present application, Figure 5 is Figure 4 a partial enlarged view of the solar cell string 100 shown in at A, Figure 6 is Figure 5 a corresponding schematic diagram of the conductive component 130, the cell 110 and the fixing glue point 120 in the solar cell string 100 shown. In one embodiment, the solar cell string 100 includes cells 110, a plurality of fixing glue points 120, conductive components 130 and a plurality of soldering parts 140. The plurality of fixing glue points 120 are arranged at intervals on the surface of the cell 110 along the first direction and the second direction.

[0076] The outer periphery of the conductive component 130 has a plurality of welding areas 131 and a plurality of adhesive areas 132. The plurality of welding areas 131 and the plurality of adhesive areas 132 are arranged alternately along the first direction, and the adhesive areas 132 are correspondingly arranged with the fixing glue points 120. The plurality of soldering parts 140 respectively correspond to the plurality of welding areas 131, and each soldering part 140 at least partially wraps the conductive component 130 along the circumferential direction of the conductive component 130 in the welding area 131. The conductive component 130 is welded and fixed to the surface of the cell 110 through the soldering part 140 in the welding area 131, and the conductive component 130 is adhesively connected to the fixing glue point 120 in the adhesive area 132.

[0077] The cell 110 is made of a silicon wafer. The cell 110 is used to absorb solar energy and convert solar energy into electrical energy. The specific structure and principle of the cell 110 are prior art, and will not be elaborated here for the cell 110. The cell 110 extends along the first direction and the second direction. The first direction and the second direction are as Figure 4 and Figure 5As shown, the first direction is perpendicular to the second direction. The first direction is the length direction of the cell 110, and the second direction is the width direction of the cell 110. The cell 110 has a certain length dimension in the first direction and a certain width dimension in the second direction.

[0078] The conductive component 130 is arranged on the surface of the cell 110 in the first direction. The conductive component 130 and the cell 110 are connected by alloy connection and non-alloy connection to ensure sufficient tensile force between the conductive component 130 and the cell 110, thereby ensuring the reliability of the connection between the conductive component 130 and the cell 110. A plurality of fixing glue points 120 are arranged on the surface of the cell 110. The conductive component 130 and the fixing glue points 120 are fixed by bonding connection to achieve non-alloy connection between the conductive component 130 and the cell 110. The area of the conductive component 130 other than the corresponding fixing glue points 120 is welded to the cell 110 to achieve alloy connection between the conductive component 130 and the cell 110.

[0079] Specifically, a plurality of fixing glue points 120 are arranged on the surface of the cell 110 in the first direction and the second direction, that is, a plurality of fixing glue points 120 are arranged in rows and columns on the surface of the cell 110. Each conductive component 130 is adhesively arranged on a plurality of fixing glue points 120 in the first direction. The area of the conductive component 130 other than the corresponding fixing glue points 120 is welded to the cell 110 to achieve electrical connection between the conductive component 130 and the cell 110.

[0080] It can be understood that the cell 110 has a front side and a back side arranged opposite to each other. Only the front side of the cell 110 is shown in Figures 4 to 6 , and the back side of the cell 110 is not shown. In the following text, only the connection between the surface of the cell 110 and the conductive component 130 is taken as an example for description.

[0081] The conductive component 130 can be fixed to the surface of the cell 110 by gluing and welding methods, so that the conductive component 130 is reliably fixed to the cell 110. The gluing and welding methods can provide sufficient tensile force between the conductive component 130 and the cell 110, ensure the connection reliability between the conductive component 130 and the cell 110, reduce costs, and can also reduce light shielding to ensure the photoelectric conversion efficiency.

[0082] Meanwhile, after the conductive component 130 is fixed to the battery cell 110 by welding, the area of the conductive component 130 other than the corresponding fixing glue points 120 can be electrically connected to the battery cell 110 to ensure the electrical contact performance between the conductive component 130 and the battery cell 110, so that the conductive component 130 can normally collect the current generated by the battery cell 110. Moreover, in order to facilitate the welding connection between the conductive component 130 and the battery cell 110, a soldering aid part 140 is further provided on the conductive component 130 to further improve the firmness of the welding connection between the conductive component 130 and the battery cell 110. Here, the soldering aid part 140 is a soldering flux layer coated on the conductive component 130.

[0083] As Figure 6 shown, the battery cell 110 has a plurality of conductive regions 111 arranged at intervals in the first direction. The conductive regions 111 extend in the second direction, and fixing glue points 120 are arranged between adjacent conductive regions 111. Moreover, a plurality of conductive layers 112 are arranged in each conductive region 111. The plurality of conductive layers 112 are arranged at intervals in the first direction and extend in the second direction. When the conductive component 130 is welded to the battery cell 110, the conductive component 130 can be welded to the conductive layers 112 in the conductive regions 111 of the battery cell 110, realizing the electrical connection between the conductive component 130 and the battery cell 110, so that the conductive component 130 can collect the current generated by the battery cell 110.

[0084] See Figures 4 to 6 , in this application, the outer wall of the conductive component 130 has a plurality of welding regions 131 and a plurality of adhesive regions 132. The plurality of welding regions 131 and the plurality of adhesive regions 132 are arranged alternately in the first direction. The plurality of adhesive regions 132 respectively correspond to the plurality of fixing glue points 120, and the plurality of welding regions 131 respectively correspond to the plurality of soldering aid parts 140. The soldering aid part 140 at least partially wraps the conductive component 130 along the circumferential direction of the conductive component 130 in the welding region 131. That is, after the soldering aid part 140 is arranged in the welding region 131 of the conductive component 130, there is no soldering aid part 140 in the adhesive region 132 of the conductive component 130.

[0085] In this way, a plurality of soldering aid parts 140 are arranged at intervals in the first direction on the conductive component 130, and there is a certain distance between two adjacent soldering aid parts 140, and this distance is the adhesive region 132. That is to say, the outer wall of the conductive component 130 is arranged with a soldering flux layer and a non-soldering flux layer alternately. The non-soldering flux layer adhesive region 132 corresponds to the fixing glue point 120. In the welding region 131 with a soldering flux layer, the soldering flux layer is the soldering aid part 140, and the welding region 131 corresponds to the conductive region 111 of the battery cell 110 through the soldering aid part 140.

[0086] When the conductive component 130 is connected to the fixing glue point 120 and the solar cell 110, the welding area 131 of the conductive component 130 can be welded and connected to the conductive area 111 of the solar cell 110 through the soldering aid part 140, and the adhesive area 132 of the conductive component 130 can be adhesively connected to the fixing glue point 120. The soldering aid part 140 facilitates the welding connection between the conductive component 130 and the solar cell 110 in the welding area 131, ensuring the reliability of the welding connection between the conductive component 130 and the solar cell 110, and the fixing glue point 120 realizes the adhesive connection between the conductive component 130 and the solar cell 110.

[0087] Meanwhile, since there is no soldering aid part 140 in the adhesive area 132, in this way, the acidic component in the soldering aid part 140 will not inhibit the activity of the catalytic component in the fixing glue point 120, and the soldering aid part 140 will not form an alloy coating at the corresponding conductive component 130 in the adhesive area 132. Thus, it can ensure the adhesive force between the fixing glue point 120 for adhesively connecting the conductive component 130 and the solar cell 110, to ensure the firmness of the non-alloy connection between the conductive component 130 and the solar cell 110, to ensure the reliability of the connection between the conductive component 130 and the solar cell 110, avoid the problem of poor soldering between the conductive component 130 and the solar cell 110, and ensure the output power of the photovoltaic module.

[0088] Moreover, the present application uses the welding device 200 to manufacture the solar cell string 100. The fixing glue point 120 is printed on the surface of the solar cell 110. Subsequently, the welding device 200 can transfer the solar cell 110 printed with the fixing glue point 120 to the welding position. At the same time, the welding device 200 can also form a soldering flux layer on the entire conductive component 130 and remove the soldering flux layer at a preset position on the conductive component 130, so that a soldering aid part 140 with a soldering flux layer and an adhesive area 132 without a soldering flux layer are formed on the conductive component 130. And the area of the conductive component 130 with the soldering flux layer is the welding area 131, and the soldering flux layer in the welding area 131 is denoted as the soldering aid part 140.

[0089] And Figure 2 And Figure 3 FIGS. and are structural diagrams for forming the soldering aid part 140 and the adhesive area 132 on the conductive component 130, and their specific structures and principles will be described later. Figure 2 And Figure 3 After a soldering flux layer can be formed on the entire conductive component 130, the soldering flux layer at the preset position is removed, so that the welding area 131 with the soldering flux layer on the conductive component 130 forms the soldering aid part 140, the preset position forms the adhesive area 132, and there is no soldering flux layer in the adhesive area 132. After the soldering flux layer is removed from the preset position on the conductive component 130, the conductive component 130 is pulled to the welding position and is located above the solar cell 110.

[0090] Then, the conductive component 130 is pressed onto the solar cell 110, and the adhesive area 132 of the conductive component 130 is aligned with the fixing glue dots 120, and the soldering assistant part 140 of the conductive component 130 is aligned with the conductive area 111 of the solar cell 110. A welding mechanism (not shown) heats and welds them, and the fixing glue dots 120 are heated and melted to bond and connect the conductive component 130 and the solar cell 110 at the adhesive area 132. At the same time, the soldering assistant part 140 welds and connects the conductive component 130 and the conductive area 111 of the solar cell 110. The soldering assistant part 140 facilitates the welding connection between the conductive component 130 and the conductive area 111 of the solar cell 110, while the adhesive area 132 without a soldering flux layer can reliably bond and connect the conductive component 130 and the fixing glue dots 120.

[0091] In this way, the production of the solar cell string 100 is completed. The following describes the specific manufacturing method of an embodiment of the solar cell string 100.

[0092] See Figures 1 to 5 , in an embodiment, the manufacturing method of the solar cell string 100 includes:

[0093] S100, printing a plurality of fixing glue dots 120 on the surface of the solar cell 110 at intervals along a first direction and a second direction.

[0094] The solar cell 110 is the base material for manufacturing the solar cell string 100, and the solar cell 110 can absorb solar energy and convert it into electrical energy. To ensure the reliability of the connection between the solar cell 110 and the conductive component 130 and reduce the manufacturing cost, fixing glue dots 120 are printed on the solar cell 110, and the conductive component 130 and the solar cell 110 are connected and fixed by welding and bonding methods.

[0095] After the conductive component 130 is welded to the solar cell 110, the conductive component 130 can collect the current generated by the solar cell 110 to achieve the function of the solar cell string 100. After the conductive component 130 is adhesively connected to the solar cell 110, the solar cell string 100 can achieve the effects of cost reduction, silver reduction, and efficiency improvement.

[0096] Here, the solar cell 110 can be a raw material of the solar cell or a component with the required size obtained after pre-cutting the raw material of the solar cell, that is, the solar cell 110 can be an integral structure or a cut structure, which is selected according to actual needs.

[0097] In the present application, the battery cell 110 is transported to the welding device 200, and the welding device 200 prints the fixed glue dots 120 on the battery cell 110, and the conductive component 130 is bonded and connected to the battery cell 110 through the fixed glue dots 120. There are multiple fixed glue dots 120 on the battery cell 110, and the multiple fixed glue dots 120 are arranged at intervals along the first direction and the second direction, that is, the fixed glue dots 120 are arranged on the surface of the battery cell 110 in rows and columns.

[0098] Moreover, a plurality of fixed glue points 120 along the first direction are bonded to a conductive component 130, and a plurality of fixed glue points 120 along the second direction can achieve bonding connection of a plurality of conductive components 130, so as to fix the plurality of conductive components 130 to the solar cell 110. The plurality of conductive components 130 collect current and connect adjacent solar cell strings 100, so as to facilitate the later packaging of the solar cell strings 100 to form a photovoltaic module.

[0099] It is worth noting that the process of making the solar cell string 100 using the cell raw material or cutting the cell 110 is essentially the same, except that there is a question of whether the cell raw material needs to be cut. If the solar cell string 100 is made directly from the cell raw material, the cell raw material can be directly fed into the welding device 200 to print the fixed glue dots 120.

[0100] When the cut cell raw material is used to make the solar cell string 100, the cell raw material is fed into the welding device 200, and the welding device 200 performs pre-cutting on the cell raw material. The cell raw material is pre-cut according to the layout design of the photovoltaic module to obtain the cell 110 of the required size. It can be understood that when the cell raw material is in the pre-cutting stage, the welding device 200 pre-cuts the cell raw material into 1 / 2 pieces, 1 / 3 pieces, 1 / 4 pieces, 1 / 5 pieces, 1 / 6 pieces, 1 / 7 pieces, 1 / 8 pieces, 1 / 9 pieces, etc., and selects to use cells 110 of different sizes to manufacture the solar cell string 100 according to the layout design of the photovoltaic module.

[0101] After the welding equipment 200 prints the fixed glue dots 120 on the battery cell 110, the battery cell 110 can be transported to the robot arm suction cup area via a conveyor belt, and the battery cell 110 is transferred to the welding position in the welding equipment 200 through the robot arm suction cup (not shown) in the welding equipment 200, so as to facilitate the subsequent welding connection and bonding connection between the conductive component 130 and the battery cell 110.

[0102] S200 , the conductive component 130 is pulled through the flux tank 210 and immersed in the flux in the flux tank 210 to form a flux layer on the outer periphery of the conductive component 130 .

[0103] During the process of processing the battery cell 110, the welding device 200 can simultaneously process the conductive component 130 to form a soldering portion 140 and an adhesive area 132 that serve as a soldering flux layer on the conductive component 130. The processing here mainly refers to soaking and heating processes to form the soldering portion 140 and the adhesive area 132 mentioned above. To form a soldering flux layer on the conductive component 130, a soldering flux tank 210 is provided in the welding device 200, and the soldering flux tank 210 contains soldering flux.

[0104] After the wire reel of the conductive component 130 is loaded onto the welding device 200, the conductive component 130 is pulled to the soldering flux tank 210 and immersed in the soldering flux in the soldering flux tank 210. In this way, the soldering flux can cover the entire outer side of the conductive component 130. Then, the conductive component 130 is pulled out of the soldering flux tank 210, and the soldering flux covers the entire outer side of the conductive component 130 to form a soldering flux layer. That is to say, the conductive component 130 is immersed in the soldering flux tank 210 in a full-immersion manner so that the entire outer side of the conductive component 130 is covered with the soldering flux layer.

[0105] S300, pull the conductive component 130 out of the soldering flux tank 210, and use the heating device 220 to remove the soldering flux layer at a preset position on the conductive component 130 to expose the outer wall of the conductive component 130 to form the adhesive area 132 corresponding to the fixing glue point 120.

[0106] After the conductive component 130 is pulled out of the soldering flux tank 210, the entire outer side of the conductive component 130 is covered with the soldering flux layer. If the conductive component 130 is directly welded to the surface of the battery cell 110, the soldering flux layer on the outer side of the conductive component 130 will contact the fixing glue point 120, reducing the bonding force of the fixing glue point 120 to bond and connect the conductive component 130 and the battery cell 110, resulting in the tensile force value between the fixing glue point 120 and the conductive component 130 not meeting the standard requirements.

[0107] Therefore, it is necessary to remove the soldering flux layer at the position corresponding to the fixing glue point 120 on the conductive component 130. That is, remove the soldering flux layer at the preset position on the conductive component 130 to form the adhesive area 132 on the conductive component 130. Correspondingly, the remaining soldering flux layer on the conductive component 130 forms the soldering portion 140 and is provided in the welding area 131 of the conductive component 130. The adhesive area 132 of the conductive component 130 can correspond to the fixing glue point 120 on the battery cell 110.

[0108] Moreover, the present application uses a heating method to remove the solder flux layer on the conductive component 130 at a preset position. A heating device 220 is provided in the welding equipment 200. After the conductive component 130 is pulled out of the solder flux tank 210, the conductive component 130 is pulled to the heating device 220. The heating device 220 can heat the preset position of the conductive component 130 so that the solder flux layer at the preset position reaches the volatilization critical temperature.

[0109] After the solder flux layer at the preset position volatilizes, the outer wall of the conductive component 130 can be exposed at the preset position to form the adhesive area 132 of the conductive component 130. There is no solder flux layer in the adhesive area 132 and it can correspond to the fixed glue point 120. Moreover, the remaining part of the conductive component 130 still has a solder flux layer to form a soldering part 140 in the welding area 131 of the conductive component 130.

[0110] In this way, the conductive component 130 is provided with a soldering part 140 with a solder flux layer in the welding area 131. After removing the solder flux layer in the adhesive area 132 of the conductive component 130, there is no solder flux layer in the adhesive area 132. When the conductive component 130 is fixed to the battery cell 110, the adhesive area 132 will not contact the fixed glue point 120 through the solder flux layer, and the soldering part 140 with the solder flux layer facilitates the soldering connection between the welding area 131 of the conductive component 130 and the battery cell 110.

[0111] S400, press the conductive component 130 onto the battery cell 110 along the first direction, bond and connect the conductive component 130 with the fixed glue point 120 in the adhesive area 132, and at the same time weld and fix the conductive component 130 to the area of the battery cell 110 other than the fixed glue point 120 through the solder flux layer.

[0112] After the solder flux layer at the preset position on the conductive component 130 is removed, the conductive component 130 is pulled to the welding position. At the same time, the battery cell 110 corresponding to the conductive component 130 is also transferred to the welding position, and the conductive component 130 is located above the battery cell 110.

[0113] Press the conductive component 130 onto the battery cell 110 along the first direction. The soldering part 140 in the welding area 131 of the conductive component 130 is correspondingly arranged with the conductive area 111 of the battery cell 110, and the adhesive area 132 of the conductive component 130 is correspondingly arranged with the fixed glue point 120, so that there is no misalignment between the conductive component 130 and the battery cell 110, thus ensuring the accuracy of the connection between the conductive component 130 and the battery cell 110 in the later stage.

[0114] Subsequently, the welding mechanism in the welding device 200 heats for welding, and the soldering portion 140 of the conductive component 130 in the welding area 131 can be welded and connected to the conductive area 111 of the cell 110. The conductive component 130 is adhesively connected to the fixed adhesive point 120 through the adhesive area 132, so as to fix the conductive component 130 to the cell 110.

[0115] In this application, the welding device 200 is used to weld and adhesively fix the conductive component 130 to the surface of the cell 110. A plurality of fixed adhesive points 120 are printed on the surface of the cell 110, and then the cell 110 with the printed fixed adhesive points 120 is transferred to the welding position in the welding device 200. Meanwhile, the conductive component 130 can be immersed in the flux in the flux tank 210, the conductive component 130 is pulled out from the flux tank 210, and the heating device 220 is used to remove the flux layer at a preset position on the conductive component 130, so as to expose the outer wall of the conductive component 130 at the preset position, forming an adhesive area 132 corresponding to the fixed adhesive point 120. There is no flux layer in the adhesive area 132, and the flux layer on the conductive component 130 in the welding area 131 forms a soldering portion 140.

[0116] The conductive component 130 from which the flux in the flux tank 210 at the preset position has been removed is pulled to the welding position. Subsequently, after the conductive component 130 is pressed against the cell 110 in the first direction, the welding mechanism in the welding device 200 heats for welding. The conductive component 130 is adhesively connected to the fixed adhesive point 120 in the adhesive area 132. At the same time, the conductive component 130 is welded and fixed to the conductive area 111 of the cell 110 through the soldering portion 140 in the welding area 131.

[0117] In this way, there is no flux layer in the adhesive area 132 of the conductive component 130. Furthermore, the acidic components in the flux layer will not inhibit the activity of the catalytic components in the fixed adhesive point 120, and the flux layer will not form an alloy coating at the corresponding conductive component 130 in the adhesive area 132. Thus, the adhesive force between the fixed adhesive point 120 for adhesively connecting the conductive component 130 and the cell 110 can be ensured, so that the tensile force for the fixed adhesive point 120 to adhesively connect the conductive component 130 and the cell 110 can meet the requirements.

[0118] The manufacturing method of the solar cell string 100 of the above embodiment heats a preset position on the conductive component 130 soaked with the soldering flux to remove the soldering flux layer at the preset position. After the conductive component 130 is fixed to the cell 110 by welding and gluing, the soldering flux layer can contribute to the welding and fixing of the conductive component 130 to the cell 110, increasing the firmness of the connection between the conductive component 130 and the cell 110. At the same time, the soldering flux layer on the conductive component 130 does not contact the fixing glue dots 120, so as to increase the bonding force of the fixing glue dots 120 for bonding and connecting the conductive component 130 and the cell 110, so that the tensile value of the fixing glue dots 120 connecting the conductive component 130 and the cell 110 meets the requirements, effectively improving the reliability of welding, ensuring the reliability of the connection between the conductive component 130 and the cell 110, and avoiding problems such as poor soldering and low power between the conductive component 130 and the cell 110, so as to ensure the service performance of the photovoltaic module.

[0119] See Figure 2 and Figure 3 In one embodiment, the welding device 200 includes a soldering flux tank 210, a wire pressing roller 230, a traction mechanism 240 and a guide post 250. The traction mechanism 240 is connected to one end of the conductive component 130. The wire pressing roller 230 is arranged in the soldering flux tank 210 to press the conductive component 130 into the soldering flux tank 210. The guide post 250 is arranged on the side of the soldering flux tank 210, and the guide post 250 is used to guide the movement of the conductive component 130.

[0120] The traction mechanism 240 provides power for the movement of the conductive component 130. The traction mechanism 240 can pull the conductive component 130 to move in the welding device 200, so that the conductive component 130 can move to various positions of the welding device 200, facilitating the connection between the conductive component 130 and the cell 110. The soldering flux tank 210 is a sunken box body, and the soldering flux is contained in the soldering flux tank 210.

[0121] The wire pressing roller 230 is rotatably arranged in the soldering flux tank 210. After the traction mechanism 240 pulls the conductive component 130 into the soldering flux tank 210, the conductive component 130 is located below the wire pressing roller 230. The wire pressing roller 230 presses the conductive component 130 into the soldering flux tank 210, so that the conductive component 130 can be immersed in the soldering flux in the soldering flux tank 210, facilitating the full immersion of the conductive component 130 in the soldering flux tank 210, so as to form a soldering flux layer on the outer wall of the conductive component 130.

[0122] Moreover, the number of the wire pressing rollers 230 is two, and the two wire pressing rollers 230 are rotatably arranged at both ends of the soldering flux tank 210 to ensure that the conductive component 130 can be immersed in the soldering flux in the soldering flux tank 210. Of course, in other embodiments of the present application, the number of the wire pressing rollers 230 can also be more.

[0123] The guiding column 250 can guide the movement of the conductive component 130. After the traction mechanism 240 pulls the conductive component 130 out of the flux tank 210, the conductive component 130 can move along the guiding column 250 so that the conductive component 130 moves to the heating device 220. The heating device 220 heats a preset position of the conductive component 130 to remove the flux layer at the preset position and form an adhesive area 132.

[0124] After the conductive component 130 of the present application is loaded onto the welding device 200, the traction mechanism 240 is connected to the end of the conductive component 130 and pulls the conductive component 130 into the flux tank 210. The conductive component 130 can move along the guiding column 250 to the heating position. At this time, the heating device 220 of the welding device 200 corresponds to the conductive component 130, and the heating device 220 heats a preset position of the conductive component 130 to remove the flux layer at the preset position. Then, the traction mechanism 240 pulls the conductive component 130 to the welding position, and the conductive component 130 and the battery cell 110 are heated and welded through the welding mechanism.

[0125] See Figure 4 、 Figure 5 、 Figure 7 and Figure 8 , in an embodiment of the present application, the battery cell 110 is a main-gridless battery cell, and the conductive component 130 is fixed to the surface of the battery cell 110 along a first direction through a plurality of fixing glue points 120. Figure 7 is Figure 5 a schematic diagram of the correspondence between the fixing glue points 120 and the conductive component 130 in the solar cell string 100 shown in Figure 8 is Figure 7 a schematic diagram of the cooperation between the fixing glue points 120 and the conductive component 130 shown in

[0126] See Figures 9 to 12 , in another embodiment of the present application, the battery cell 110 is a main-gridless battery cell, and the conductive component 130 is fixed to the surface of the battery cell 110 along a first direction through a plurality of fixing glue points 120 and welding pads 113. The conductive component 130 is welded and adhesively connected to the welding pads 113, a plurality of fixing glue points 120, and the battery cell 110. Figure 9 is a schematic diagram of the solar cell string 100 according to another embodiment of the present application, Figure 10 is Figure 9 a partial enlarged view of the solar cell string 100 shown inFigure 11 As Figure 10 shown in the schematic diagram corresponding to the fixing glue dots 120 and the conductive component 130, Figure 12 As Figure 11 shown in the schematic diagram of the cooperation between the fixing glue dots 120 and the conductive component 130.

[0127] A plurality of fixing glue dots 120 are arranged in the first direction, and the welding pads 113 are arranged at both ends of the plurality of fixing glue dots 120, that is, a structural form with welding pads 113 at the ends and a plurality of fixing glue dots 120 in the middle is formed. The soldering aid portion 140 is arranged in the welding area 131. In this way, the conductive component 130 is welded and connected to the areas of the welding pads 113 and the battery cell 110 other than the fixing glue dots 120, and is adhesively connected to the fixing glue dots 120 in the adhesive area 132, and the soldering aid groove 210 is prevented from contacting the fixing glue dots 120.

[0128] Of course, in other embodiments of the present application, main grid lines may also be provided on the battery cell 110, and a plurality of fixing glue dots 120 are arranged on the main grid lines.

[0129] In one embodiment, the soldering aid layer on the outer wall of the conductive component 130 is in a liquid state. That is to say, the soldering aid in the soldering aid groove 210 is a liquid soldering aid. After the conductive component 130 is drawn out from the soldering aid groove 210, a liquid soldering aid portion 140 can be formed in the welding area 131 of the conductive component 130. Of course, in other embodiments of the present application, the soldering aid layer on the outer wall of the conductive component 130 is in a solid state. That is to say, the soldering aid in the soldering aid groove 210 can be a liquid soldering aid or a solid soldering aid. After the conductive component 130 is drawn from the soldering aid groove 210, a solid soldering aid portion 140 can be formed in the welding area 131 of the conductive component 130.

[0130] In one embodiment, the fixing glue dots 120 are formed of glue that can be catalytically cured under curing conditions. To prevent the acidic components in the soldering aid portion 140 from inhibiting the activity of the catalytic components in the fixing glue dots 120, no soldering aid layer is provided in the adhesive area 132 in the present application.

[0131] It should be noted that the shape of the fixing glue dots 120 is not limited in principle, as long as the fixing glue dots 120 can adhesively connect the adhesive area 132 of the conductive component 130 and the battery cell 110. Optionally, the shape of the fixing glue dots 120 is hemispherical, square, straight-line splicing type, curve splicing type, straight-line and curve splicing type or other shapes.

[0132] Exemplarily, as Figure 6 shown, the shape of the fixing glue dots 120 is hemispherical, that is, the outer contour of the fixing glue dots 120 is semi-circular. Of course, in other embodiments of the present application, the fixing glue dots 120 can also be square or other regular or irregular shapes.

[0133] See Figure 2 and Figure 3 In one embodiment, the number of heating devices 220 is multiple, and the multiple heating devices 220 simultaneously heat a preset position on the conductive component 130. That is to say, multiple heating devices 220 are used to simultaneously heat the preset position on the conductive component 130 to simultaneously form multiple adhesive areas 132, improving the efficiency of removing the flux layer at the preset position of the conductive component 130, and further improving the production efficiency of the solar cell string 100.

[0134] In one embodiment, the heating temperature range of the heating device 220 is 80°C to 200°C. Generally, the critical temperature for the volatilization of the acidic component in the flux is 80°C to 200°C. When the heating temperature of the heating device 220 for the preset position is within the range of 80°C to 200°C, the heating device 220 can make the heating temperature reach the critical temperature for the volatilization of the acidic component in the flux when heating the preset position, so that the flux layer at the preset position volatilizes, achieving the purpose of removing the flux layer in the adhesive area 132.

[0135] See Figure 2 and Figure 3 In one embodiment of the present application, the multiple heating devices 220 are arranged in rows and columns along the first direction and the second direction, and each conductive component 130 corresponds to at least two heating devices 220. That is to say, the multiple heating devices 220 are arranged in an array, the number of conductive components 130 is equal to the number of heating devices 220 in the second direction, and in the first direction, each conductive component 130 corresponds to multiple heating devices 220.

[0136] In this way, each conductive component 130 can use multiple heating devices 220 to heat the corresponding preset position to simultaneously remove the flux layer at the preset position on the conductive component 130. In this way, the purpose of improving the efficiency of removing the flux layer at the preset position on the conductive component 130 can be achieved.

[0137] Optionally, the number of adhesive areas 132 of the conductive component 130 in the first direction is equal to the number of heating devices 220 in the first direction. That is to say, in the first direction, the multiple heating devices 220 can cover the length of the conductive component 130 at the heating position, so that the multiple heating devices 220 can correspond to each preset position of the conductive component 130 at the heating position.

[0138] In this way, after the conductive component 130 is drawn to the heating position, the plurality of heating devices 220 heat the conductive component 130, and the solder flux layers at each preset position in the length direction of the conductive component 130 can be removed at one time. Then, the conductive component 130 at the heating position is completely drawn out, and the next part of the conductive component 130 is drawn to the heating position, and the heating device 220 can heat the conductive component 130 at the heating position again.

[0139] Of course, in other embodiments of the present application, the number of adhesive areas 132 of the conductive component 130 in the first direction is less than the number of heating devices 220 in the first direction. That is to say, in the first direction, the plurality of heating devices 220 can cover the length of the conductive component 130 at part of the heating positions. In this way, after the plurality of heating devices 220 remove the solder flux layers at the preset positions on part of the conductive component 130, the conductive component 130 is drawn to remove the solder flux layers at the preset positions on another part of the conductive component 130.

[0140] In another embodiment of the present application, the plurality of heating devices 220 are arranged at intervals in the second direction, and each heating device 220 corresponds to a conductive component 130. That is to say, the plurality of heating devices 220 are arranged in a row, and the plurality of heating devices 220 in a row respectively correspond to each conductive component 130. Each conductive component 130 is heated by a heating device 220.

[0141] In this way, after the heating device 220 finishes heating a preset position of the conductive component 130, the traction mechanism 240 draws the conductive component 130 to move so that the next preset position of the conductive component 130 corresponds to the heating device 220, and so on continuously, to remove the solder flux layers at each preset position on the conductive component 130.

[0142] See Figure 2 , in an embodiment of the present application, the heating device 220 heats in a non-contact heating manner. That is to say, there is a certain distance between the heating device 220 and the conductive component 130, and the two do not directly contact. The heating device 220 can heat the preset position of the conductive component 130 in a non-contact heating manner to remove the solder flux layer at the preset position.

[0143] The non-contact heating device 220 can emit heating light, and the heating light can be projected to the preset position to realize the heating of the preset position, so as to reach the volatile critical temperature of the acidic component in the solder flux. Optionally, the non-contact heating device 220 is a laser emitter, and the laser emitter emits laser for heating. Of course, in other embodiments of the present application, the non-contact heating device 220 can also be an infrared emitter, etc.

[0144] See Figure 1 and Figure 2, in one embodiment, a heating device 220 is used to remove the solder flux layer at a preset position on the conductive component 130, including:

[0145] After the heating device 220 receives a heating signal, the heating device 220 emits heating light rays towards the conductive component 130;

[0146] The heating light rays heat the preset position on the conductive component 130, causing the solder flux layer at the preset position to volatilize, so as to form an adhesive area 132 at the corresponding preset position on the conductive component 130.

[0147] A non-contact heating device 220 is used to heat and remove the solder flux layer at a preset position on the conductive component 130. A control signal is sent to the heating device 220. After the heating device 220 receives the control signal, the heating device 220 can emit heating light rays towards the preset position of the conductive component 130. The heating light rays heat the preset position on the conductive component 130 to reach the volatilization critical temperature of the acidic component in the solder flux, causing the solder flux layer at the preset position to volatilize, so as to form an adhesive area 132 without a solder flux layer on the conductive component 130.

[0148] In one embodiment of the present application, the heating device 220 heats the preset position on the conductive component 130 by emitting disposable heating light rays. That is to say, the heating device 220 emits disposable heating light rays. After the conductive component 130 is pulled to the heating position, the traction of the conductive component 130 stops, and multiple heating devices 220 simultaneously emit heating light rays to remove the solder flux layers at each preset position in the length direction of the conductive component 130 at one time.

[0149] The processed conductive component 130 is removed from the heating device 220, and the next unprocessed part of the conductive component 130 is aligned with the heating device 220. The heating device 220 emits heating light rays again to remove the solder flux layers at each preset position in the length direction of the conductive component 130 at one time. In this way, it is continuously reciprocated to realize the treatment of the solder flux layer of the remaining part of the conductive component 130.

[0150] In another embodiment of the present application, during the traction of the conductive component 130, the heating device 220 continuously heats the preset position on the conductive component 130. That is to say, the heating device 220 emits continuous heating light rays. The heating device 220 can emit continuous heating light rays during the traction of the conductive component 130 to remove the solder flux layer at the preset position on the conductive component 130, that is, the solder flux layer is removed while the conductive component 130 is moving and the heating device 220 is working.

[0151] See Figure 1 and Figure 3, in another embodiment of the present application, the heating device 220 heats by means of contact heating, and the end of the heating device 220 is provided with a contact heating member 221. That is to say, the heating device 220 can directly abut against the conductive component 130, and the heating device 220 can heat a preset position of the conductive component 130 in a contact heating manner to remove the solder flux layer at the preset position.

[0152] The contact-type heating device 220 has a contact heating member 221, and the contact heating member 221 is located at the head end of the heating device 220. The heating device 220 can contact a preset position of the conductive component 130 through the contact heating member 221. In this way, the contact heating member 221 can heat the preset position to reach the volatilization critical temperature of the acidic components in the solder flux. Optionally, the contact-type heating device 220 is a heating probe or the like.

[0153] In one embodiment, removing the solder flux layer at a preset position on the conductive component 130 by using the heating device 220 includes:

[0154] After the conductive component 130 is pulled into place, drive the heating device 220 to move so that the contact heating member 221 abuts against the preset position on the conductive component 130;

[0155] Control the contact heating member 221 to heat the preset position to volatilize the solder flux layer at the preset position, so as to form an adhesive area 132 at the position corresponding to the preset position on the conductive component 130.

[0156] After the conductive component 130 is pulled to the heating position, the traction of the conductive component 130 stops, and multiple heating devices 220 can respectively correspond to each conductive component 130. Then, drive the heating device 220 to descend, and the heating device 220 can abut against the preset position of the conductive component 130 through the contact heating member 221. After controlling the heating device 220 to heat, the heating device 220 can heat the preset position through the contact heating member 221 to reach the volatilization critical temperature of the acidic components in the solder flux, so as to volatilize the solder flux layer at the preset position and form an adhesive area 132 without a solder flux layer on the conductive component 130.

[0157] It should be noted that in principle, the type of the contact heating member 221 is not limited, as long as the contact heating member 221 can abut against the conductive component 130 and heat the preset position of the conductive component 130. Exemplarily, as Figure 13 shown, the contact heating member 221 is arranged in a U shape. Figure 13 For Figure 3 the schematic diagram of the heating device 220 shown. Of course, in other embodiments of the present application, the contact heating member 221 can also be in a Y shape, an arc shape or other regular and irregular shapes, as long as it can abut against the preset position of the conductive component 130.

[0158] In one embodiment, the number of contact heating elements 221 is greater than or equal to the number of fixing glue points 120. That is to say, along the first direction, the number of heating devices 220 is greater than or equal to the number of gluing areas 132 on the conductive component 130. In this way, after multiple heating devices 220 come into contact with the preset positions of the conductive component 130, the solder flux layer at the preset positions on the conductive component 130 can be removed simultaneously, without the need to continuously contact the conductive component 130 during the traction process of the conductive component 130.

[0159] It should be noted that the setting position of the heating device 220 is not restricted in principle, as long as the heating device 220 can correspond to the preset positions on the conductive component 130. Optionally, the heating device 220 can be vertically arranged on the conductive component 130. Of course, the heating device 220 can also be inclined relative to the conductive component 130.

[0160] That is to say, the position layout of the heating device 220 can be multi-directional and multi-angle. The heating device 220 can be arranged directly above the conductive component 130, or can be arranged obliquely above the conductive component 130, as long as the heating device 220 can heat the preset positions of the conductive component 130.

[0161] See Figures 2 to 12 , in this embodiment, the conductive component 130 is a conductive metal wire. The conductive metal wire has a relatively thin wire diameter, which can collect current while reducing the light shielding, thereby improving the efficiency of the photovoltaic module. Of course, in other embodiments of the present application, the conductive component 130 can also be a conductive metal strip or a conductive wire, etc.

[0162] Moreover, after the conductive component 130 of the present application collects current using a conductive metal wire, when the solar cell string 100 is used to prepare a photovoltaic module, a thinner encapsulation adhesive film can be used for encapsulation, achieving cost reduction of materials. And the amount of metal electrodes can be reduced, thereby reducing the manufacturing cost of the photovoltaic module. In this way, the solar cell string 100 can use more and thinner conductive components 130 to collect current, shortening the current transmission distance, which is beneficial to improving the power.

[0163] See Figures 2 to 12 , in one embodiment, the diameter size of the conductive component 130 is 0.1 mm to 0.3 mm. That is to say, the longitudinal cross-sectional shape of the conductive component 130 is circular, and the conductive component 130 has a relatively thin filamentous structure. Since the present application provides multiple conductive components 130, even if the diameter size of the conductive component 130 is relatively thin, it will not affect the current collection of the solar cell string 100. At the same time, the relatively thin diameter size of the conductive component 130 can also reduce the light shielding, improve the efficiency of the photovoltaic module, and can use a thinner encapsulation adhesive film for encapsulation, reducing the amount of metal electrodes and the manufacturing cost of the photovoltaic module.

[0164] Of course, in other embodiments of the present application, the longitudinal cross-section of the conductive component 130 is an equilateral triangle, and the side length of the longitudinal cross-section of the conductive component 130 is 0.1 mm to 0.3 mm. Since the present application provides multiple conductive components 130, even if the longitudinal cross-section of the conductive component 130 is thin, it will not affect the current collection of the solar cell string 100. At the same time, the thin longitudinal cross-section of the conductive component 130 can also reduce light blocking, improve the efficiency of the photovoltaic module, and can use a thinner packaging film for packaging, reduce the amount of metal electrodes, and reduce the manufacturing cost of the photovoltaic module.

[0165] In one embodiment, the welding device 200 includes a left channel structure and a right channel structure, the right channel structure is generally a pre-cutting and operation channel for the battery cell 110, and the left channel structure is generally a feeding, soaking and pulling channel for the conductive component 130. The left channel structure and the right channel structure of the welding device 200 can be operated synchronously to improve the working efficiency of the welding device 200.

[0166] When the welding device 200 adopts the left channel structure and the right channel structure to manufacture the solar cell string 100, the manufacturing method includes the following steps:

[0167] In the right channel structure: when the solar cell string 100 is made of cell raw materials, the cell raw materials are directly fed into the right channel structure for printing fixed glue dots 120; when the solar cell string 100 is made of cut cell raw materials, the cell raw materials are fed into the right channel structure, and the cell raw materials are in the pre-cutting stage, and the cell raw materials are pre-cut into 1 / 2 pieces, 1 / 3 pieces, 1 / 4 pieces, 1 / 5 pieces, 1 / 6 pieces, 1 / 7 pieces, 1 / 8 pieces, 1 / 9 pieces, etc., and different sizes of cell 110 are selected according to the layout design of the photovoltaic module; fixed glue dots 120 are printed on the surface of the cell 110, and the cell 110 after printing the fixed glue dots 120 is transported to the robot arm suction cup area via a conveyor belt, and the robot arm suction cup grabs the cell 110 to the welding position of the left channel structure.

[0168] In the left channel structure: Feed the conductive component 130. The conductive component 130 is pulled by the traction mechanism 240 through the flux tank 210 to achieve full immersion. After the conductive component 130 is pulled out of the flux tank 210, the heating device 220 heats a preset position of the conductive component 130 to volatilize the flux layer at the preset position. The traction mechanism 240 pulls the conductive component 130 above the solar cell 110 at the welding position. At this time, physical contact has been achieved between the conductive component 130 and the solar cell 110. The welding screen is used to press the conductive component 130 and the solar cell 110 to prevent misalignment between the two. Then, the welding mechanism heats for welding. The flux layer welds and connects the welding area 131 of the conductive component 130 and the conductive area 111 of the solar cell 110. The fixing glue dots 120 start to cure under high-temperature heating, realizing the bonding connection of the bonding area 132 of the conductive component 130, the fixing glue dots 120, and the solar cell 110.

[0169] In the manufacturing method of the solar cell string 100 of the present application, a preset position on the conductive component 130 immersed in the flux is heated to remove the flux layer at the preset position. After the conductive component 130 is fixed to the solar cell 110 by welding and gluing, the flux layer can help the conductive component 130 to be welded and fixed to the solar cell 110, increasing the firmness of the connection between the conductive component 130 and the solar cell 110. At the same time, the flux layer on the conductive component 130 does not contact the fixing glue dots 120, so as to increase the bonding force of the fixing glue dots 120 for bonding and connecting the conductive component 130 and the solar cell 110, so that the tensile value of the fixing glue dots 120 connecting the conductive component 130 and the solar cell 110 meets the requirements, effectively improving the reliability of welding, ensuring the reliability of the connection between the conductive component 130 and the solar cell 110, and avoiding problems such as poor soldering and low power between the conductive component 130 and the solar cell 110, so as to ensure the service performance of the photovoltaic module.

[0170] The process method of the present application is easy to implement and has various forms. The heating device 220 can adopt a contact structure or a non-contact structure. The heating device 220 used in the welding equipment 200 occupies a small space and has a low input cost. After heating a preset position on the conductive component 130 by the heating device 220, the flux layer at the preset position can be effectively removed, so that there is no flux layer in the bonding area 132, effectively solving the problem of poor soldering.

[0171] The manufacturing method of the solar cell string 100 of the present application can ensure the bonding force between the conductive component 130, the fixing glue dots 120 and the cell 110, solve the problem of unqualified tensile force in 0BB battery welding, ensure the reliability of the connection between the conductive component 130 and the cell 110. At the same time, it can also improve the problems of virtual soldering and abnormal power, and ensure the service performance of the solar cell string 100. Moreover, the manufacturing method of the solar cell string 100 of the present application can greatly facilitate the rapid mass production and application of 0BB batteries, making the 0BB batteries have the characteristics of cost reduction, efficiency increase, high reliability, etc.

[0172] The present application also provides a solar cell string 100, which is formed by using the manufacturing method of the solar cell string 100 in any of the above embodiments. The solar cell string 100 includes cells 110, a plurality of fixing glue dots 120, a conductive component 130 and a plurality of soldering aid coatings. The plurality of fixing glue dots 120 are arranged on the cell 110 at intervals in the first direction and the second direction. The plurality of soldering aid coatings are arranged on the conductive component 130 at intervals in the first direction. Adjacent two soldering aid layers form an adhesive zone 132 on the outer wall of the conductive component 130, and the adhesive zone 132 is arranged corresponding to the fixing glue dots 120. The conductive component 130 is welded and fixed on the surface of the cell 110 through the soldering aid layer, and the conductive component 130 is adhesively connected to the fixing glue dots 120 in the adhesive zone 132.

[0173] After the solar cell string 100 of the present application is manufactured by the above manufacturing method, the soldering aid layer at positions other than the preset positions on the conductive component 130 can be effectively removed. In this way, after the conductive component 130 fixes the cell 110 by welding and adhesive bonding, the soldering aid layer can help the conductive component 130 to be welded and fixed on the cell 110, increasing the firmness of the connection between the conductive component 130 and the cell 110. At the same time, the soldering aid layer on the conductive component 130 does not contact the fixing glue dots 120, so as to increase the bonding force of the fixing glue dots 120 for adhesively connecting the conductive component 130 and the cell 110, so that the tensile force value of the fixing glue dots 120 connecting the conductive component 130 and the cell 110 meets the requirements, effectively improving the reliability of welding, ensuring the reliability of the connection between the conductive component 130 and the cell 110, and avoiding the problems of virtual soldering defects and low power between the conductive component 130 and the cell 110, so as to ensure the service performance of the photovoltaic module.

[0174] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0175] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A manufacturing method of a solar cell string, characterized in that include: Printing a plurality of fixed glue dots spaced apart along a first direction and a second direction on the surface of the battery cell; Pulling the conductive component through a flux tank and immersing the conductive component in the flux tank to form a flux layer on the periphery of the conductive component; The conductive component is pulled out of the flux tank, and a heating device is used to remove the flux layer at a preset position on the conductive component to expose the outer wall of the conductive component to form an adhesive area corresponding to the fixed glue point; The conductive component is pressed onto the battery cell along the first direction, bonded to the fixed glue point in the adhesive area, and fixed to the battery cell except the fixed glue point by welding through the flux layer.

2. The manufacturing method according to claim 1, characterized in that, There are multiple heating devices, and the multiple heating devices heat the preset positions on the conductive component at the same time; The heating temperature range of the heating device is 80°C to 200°C.

3. The manufacturing method according to claim 2, characterized in that, A plurality of the heating devices are arranged at intervals along the second direction, and each of the heating devices corresponds to one of the conductive components; Alternatively, a plurality of the heating devices are arranged in rows and columns along the first direction and the second direction, and each of the conductive components corresponds to at least two of the heating devices.

4. The manufacturing method according to claim 1, characterized in that, The heating device adopts non-contact heating method for heating; The method of removing the solder flux layer at a preset position on the conductive component by using a heating device comprises: After the heating device receives the heating signal, the heating device emits heating light to the conductive component; The heating light heats a preset position on the conductive component to volatilize the soldering flux layer at the preset position, so as to form the adhesive area at the conductive component corresponding to the preset position.

5. The manufacturing method according to claim 4, characterized in that, The heating device heats the preset position on the conductive component by emitting a one-time heating light beam; Alternatively, during the pulling process of the conductive component, the heating device continuously heats the preset position on the conductive component.

6. The manufacturing method according to claim 1, characterized in that, The heating device adopts contact heating mode for heating, and the end of the heating device has a contact heating element; The method of removing the solder flux layer at a preset position on the conductive component by using a heating device comprises: When the conductive component is pulled into position, the heating device is driven to move so that the contact heating element is close to the preset position on the conductive component; The contact heating element is controlled to heat the preset position, so that the soldering flux layer at the preset position is volatilized, so as to form the adhesive area at the conductive component corresponding to the preset position.

7. The manufacturing method according to claim 6, characterized in that, The contact heating element is arranged in a U-shape, a Y-shape or an arc shape; And / or, the number of the contact heating elements is greater than or equal to the number of the fixed glue points.

8. The manufacturing method according to any one of claims 1 to 7, characterized in that, The heating device is vertically arranged on the conductive component; Alternatively, the heating device is arranged obliquely relative to the conductive component.

9. The manufacturing method according to any one of claims 1 to 7, characterized in that, The solar cell string is manufactured in a welding device, which includes a left channel structure and a right channel structure and can act synchronously; The manufacturing method further comprises the following steps: In the right channel structure: According to the design of the photovoltaic module, the solar cells of different sizes are selected and used; Print the fixed glue dots on the surface of the cell; The cell after printing the fixed glue dots is transported to the robotic arm suction cup area by a conveyor belt; The robotic arm suction cup grabs the cell to the welding position of the left channel structure; In the left channel structure: Load the conductive component; The conductive component is drawn through the flux tank to achieve full immersion; After the conductive component is drawn out of the flux tank, the heating device heats the preset position of the conductive component to volatilize the flux layer at the preset position; The conductive component is drawn to above the cell at the welding position to make the conductive component physically contact the cell; Use a welding screen to press the conductive component and the cell; The welding mechanism heats and welds, and the flux layer welds and connects the conductive component and the cell. The fixed glue dots start to cure under heating to bond and connect the adhesive area of the conductive component, the fixed glue dots and the cell.

10. A solar cell string, characterized in that, Manufacture and form using the manufacturing method of the solar cell string according to any one of claims 1 to 9; The solar cell string includes cells, a plurality of fixed glue dots, conductive components, and a plurality of flux coatings. The plurality of fixed glue dots are arranged at intervals in the first direction and the second direction on the cell; The plurality of flux coatings are arranged at intervals in the first direction on the conductive component. Adjacent two flux layers form an adhesive area on the outer wall of the conductive component, and the adhesive area is correspondingly arranged with the fixed glue dots; The conductive component is welded and fixed on the surface of the cell through the flux layer, and the conductive component is bonded and connected with the fixed glue dots in the adhesive area.

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