A double-sided welding method for solar cell

Abstract

The present invention discloses a double-sided welding method for solar cell sheets, comprising the following steps: arranging a bearing surface with a routing groove on the outer surface of a welding carrier; routing a first strip-shaped conductive connector in the routing groove; placing a cell sheet on the bearing surface; tightening a second strip-shaped conductive connector on the outer surface of the cell sheet, and then the second strip-shaped conductive connector presses the cell sheet onto the first strip-shaped conductive connector protruding from the bearing surface; heating the first strip-shaped conductive connector and the second strip-shaped conductive connector, so that both the first strip-shaped conductive connector and the second strip-shaped conductive connector are welded to the cell sheet. The present invention can simultaneously complete the welding of strip-shaped conductive connectors on both sides of the cell sheet, can simplify the process of welding strip-shaped conductive connectors on both sides of the cell sheet, can optimize the effective contact between the strip-shaped conductive connectors on both sides of the cell sheet and the cell sheet, can improve welding performance, and improve welding efficiency.

Description

Technical Field

[0001] The invention relates to the field of photovoltaics, and in particular to a double-sided welding method for a solar cell sheet. Background Art

[0002] In the traditional crystalline silicon photovoltaic module manufacturing process, the cells must first be welded with welding ribbons and connected in series to form a cell string. Specifically, the method of forming a string of cells includes: placing the welding ribbons and cells alternately in sequence, with the length of the welding ribbon being approximately twice the width of the cell, so that half of the welding ribbon is on the front of a cell and the other half is on the back of the adjacent cell, and a cell string containing multiple cells and the upper and lower surfaces (i.e., positive and negative electrodes) connected in series is formed in sequence. The cell string is then transferred to the welding station through an adsorption track, and generally multiple pressing wires or pressing blocks are used to compact the upper and lower welding ribbons with the cells, and the welding ribbons are welded to the surface electrodes of the cells through infrared heating.

[0003] When welding the soldering ribbon to the battery cell, the battery cell is generally placed flat on a flat supporting surface, and the soldering ribbon is mainly pressed together with a wire mesh or a pressing block perpendicular to the direction of the soldering ribbon to bring the soldering ribbon into contact with the battery cell to complete the welding. The pressure is applied at several scattered points on the soldering ribbon, and effective contact cannot be guaranteed at the parts without pressure. In particular, when the soldering ribbon is heated, the unpressed parts of the soldering ribbon are very likely to stretch and twist, making welding impossible. In addition, a pressing wire presses multiple soldering ribbons vertically and crosswise at the same time, and the middle soldering ribbon is subjected to little force or the pressing wire is suspended in the air and no effective pressing is formed, resulting in invalid welding at this part. Therefore, the traditional welding process for welding soldering ribbons to battery cells results in many false welds.

[0004] In addition, in photovoltaic modules, triangular welding ribbons and other special-shaped welding ribbons with optical advantages are increasingly used. In traditional welding processes, it is difficult to ensure the consistency of the direction of triangular welding ribbons and other special-shaped welding ribbons through clamping, transportation, pressing, etc., and it is difficult to ensure that triangular welding ribbons and other special-shaped welding ribbons do not flip over on the entire surface of the battery cell. Therefore, the application of special-shaped welding ribbons, especially ultra-fine special-shaped welding ribbons, requires new welding methods and processes to effectively control the consistency of the orientation of the welding ribbons to achieve effective welding of special-shaped welding ribbons.

[0005] In addition, in the development of photovoltaic technology, more main grids and thinning are still important directions for the development of battery module technology. The pattern for collecting current on the surface of the battery cell is a fine grid. Considering the shading and current transmission loss, the aspect ratio of the fine grid should be as large as possible; the pattern used for connecting the battery cells in series and collecting the fine grid current is the main grid. To a certain extent, the more main grids there are, the less silver consumption of the fine grid can be, the narrower the pattern can be, and the thermal resistance loss of the fine grid is reduced, which reduces the silver consumption of the battery cell and improves the efficiency. Therefore, the main grid of the battery cell has been developing in more and more directions. In the cost of photovoltaic modules, the cost of crystalline silicon accounts for about half. The thicker the silicon wafer is, the more crystalline silicon material is used, and the higher the cost of crystalline silicon is, so the application of thin silicon wafers is also one of the important directions for the development of photovoltaic modules.

[0006] The more main grids a cell has, the more and thinner the welding ribbons are needed. The diameter of the smallest round wire welding ribbon currently used is less than 0.2mm. There are as many as 30 welding ribbons on a 210mm wide cell. Conventional welding process equipment mainly uses grippers to grab, pull, transfer, and place, and presses blocks to reduce the offset, rolling, and twisting of the welding ribbons. With so many thin welding ribbons, the control difficulty of using traditional welding processes increases sharply: 1) One welding ribbon corresponds to one reel, and the number of reels is large, which makes it difficult to design the reel position, lay out the wires, and route the wires at the same time; 2) Automation also requires supporting shortening of the flow path of welding wires and batteries, positioning of welding ribbons, and the design of the front-to-back correlation matching between various actions; 3) The impact of equipment disconnection and other failures is also greatly increased, and it is difficult to recover after a failure and to maintain the equipment. Summary of the invention

[0007] The object of the present invention is to provide a double-sided welding method for a solar cell, wherein strip-shaped conductive connectors are welded on both sides of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors include a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively disposed on both sides of the cell; and the method comprises the following steps:

[0008] A carrying surface for placing the battery cell is provided on the outer surface of a welding carrier, and the carrying surface is an outwardly convex arc surface (can be a circular arc surface); a wiring groove for placing the first strip-shaped conductive connecting member is provided on the carrying surface, and the wiring groove extends along the circumference of the carrying surface (that is, the extension direction of the wiring groove is perpendicular to the axis of the carrying surface), and the wiring groove is a through groove on the carrying surface;

[0009] Pre-arrange the first strip-shaped conductive connection member, so that the first strip-shaped conductive connection member is routed in the routing groove (the routing groove restricts the first strip-shaped conductive connection member therein to extend in the same direction as the routing groove), and the first strip-shaped conductive connection member protrudes from the routing groove (that is, the first strip-shaped conductive connection member protrudes from the bearing surface);

[0010] Place the battery cell on the carrying surface so that the battery cell does not protrude beyond the carrying surface, and make the side surface of the battery cell to be welded with the first strip-shaped conductive connecting member face the carrying surface (that is, the side surface of the battery cell to be welded with the second strip-shaped conductive connecting member is opposite to the carrying surface), and make the inner side surface of the battery cell (that is, the side surface of the battery cell facing the carrying surface) affixed to the first strip-shaped conductive connecting member protruding from the carrying surface;

[0011] The second strip-shaped conductive connector is stretched and fitted on the outer side surface of the battery cell (i.e., the side surface of the battery cell opposite to the supporting surface) along the circumference of the supporting surface, so that the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the supporting surface;

[0012] The first strip-shaped conductive connector and the second strip-shaped conductive connector are heated so that both the first strip-shaped conductive connector and the second strip-shaped conductive connector are welded on the battery cell (the strip-shaped conductive connectors are welded on both sides of the battery cell).

[0013] Preferably, if a plurality of parallel grid lines are provided on the inner side surface of the battery cell, a plurality of parallel routing grooves are provided on the carrying surface (the routing grooves on the carrying surface correspond one-to-one with the grid lines on the inner side surface of the battery cell placed on the carrying surface), so that each routing groove extends along the circumference of the carrying surface (that is, the extension direction of each routing groove is perpendicular to the axis of the carrying surface), and each routing groove is a through groove; and when the first strip-shaped conductive connector is pre-set, the first strip-shaped conductive connector is routed in each routing groove (the routing groove restricts the first strip-shaped conductive connector therein to extend in the same direction as the first strip-shaped conductive connector), and the first strip-shaped conductive connector protrudes from the routing groove in which it is located (that is, the first strip-shaped conductive connector protrudes from the carrying surface); and when the battery cell is placed on the carrying surface, the extension direction of the grid lines on the inner side surface of the battery cell is perpendicular to the axis of the carrying surface, and the grid lines on the inner side surface of the battery cell correspond to the first strip-shaped conductive connector protruding from the carrying surface in each routing groove on the carrying surface.

[0014] Preferably, if a plurality of parallel grid lines are provided on the outer side of the battery cell (the grid lines on the outer side of the battery cell are parallel to the grid lines on the inner side of the battery cell), when the second strip-shaped conductive connector is stretched and fitted tightly to the outer side of the battery cell, the second strip-shaped conductive connector is fitted correspondingly to the grid lines on the outer side of the battery cell.

[0015] Preferably, after the first strip-shaped conductive connector and the second strip-shaped conductive connector are welded to the battery cell, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off to leave small segments of the first strip-shaped conductive connector and the second strip-shaped conductive connector on the battery cell, and the small segments of the first strip-shaped conductive connector and the second strip-shaped conductive connector are used for connecting the battery cells in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell in which they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell in which they are located); then the battery cell is removed from the carrying surface of the welding carrier.

[0016] For the specific selection of the first strip-shaped conductive connector and the second strip-shaped conductive connector, the specific implementation method of pre-setting the first strip-shaped conductive connector, the specific implementation method of stretching the second strip-shaped conductive connector tightly against the outer surface of the battery cell, the specific implementation method of heating the first strip-shaped conductive connector and the second strip-shaped conductive connector, and other related specific contents, please refer to the embodiments.

[0017] The advantages and beneficial effects of the present invention are:

[0018] The present invention can simultaneously complete the welding of strip-shaped conductive connectors on both side surfaces of the battery cell, can simplify the process of welding strip-shaped conductive connectors (welding wires or welding strips) on both side surfaces of the battery cell, can optimize the effective contact between the strip-shaped conductive connectors (welding wires or welding strips) on both side surfaces of the battery cell and the battery cell, can improve the welding performance, and improve the welding efficiency.

[0019] The bearing surface of the welding carrier of the present invention is an outwardly convex arc surface, the first strip-shaped conductive connector (welding wire or welding strip) is pre-set in a routing groove extending along the circumferential direction of the bearing surface, the battery cell is placed on the bearing surface, and the battery cell is attached to the first strip-shaped conductive connector protruding from the bearing surface, and the second strip-shaped conductive connector (welding wire or welding strip) is tightly attached to the battery cell along the circumferential direction of the arc surface of the bearing surface, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the bearing surface; during welding, the first strip-shaped conductive connector (welding wire or welding strip), the battery cell and the second strip-shaped conductive connector (welding wire or welding strip) are bent on the bearing surface along the circumferential direction of the arc surface of the bearing surface, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector (welding wire or welding strip) can be continuously and fully attached to the battery cell, fully stressed and fully contacted.

[0020] The present invention can wind multiple rows of battery cells at one time, weld multiple rows of battery cells at one time, and weld strip-shaped conductive connectors (first strip-shaped conductive connectors and second strip-shaped conductive connectors) on both sides of multiple rows of battery cells at one time, thereby improving welding efficiency.

[0021] The present invention also has the following characteristics:

[0022] The present invention has less false welds; since the first strip-shaped conductive connecting member (welding wire or welding strip), the second strip-shaped conductive connecting member (welding wire or welding strip) and the battery cell can be continuously attached and evenly stressed, welding is completed under the condition of full contact under stress, so the welding is complete and sufficient, which can greatly reduce the number of false welds.

[0023] The number of reels of the first strip-shaped conductive connecting member (welding wire or welding ribbon) and the second strip-shaped conductive connecting member (welding wire or welding ribbon) used in the present invention is small and easy to control;

[0024] The present invention can use only one first strip-shaped conductive connector to carry out the winding and routing of all routing grooves on the welding carrier, and the first strip-shaped conductive connectors (welding wire or welding strip) of all routing grooves on the welding carrier are all from the same reel; the present invention can also use only one second strip-shaped conductive connector to carry out the winding of all battery cells on the welding carrier, and the second strip-shaped conductive connectors (welding wire or welding strip) of all battery cells on the welding carrier are all from the same reel; therefore, the number of reels is greatly reduced in the present invention, thereby simplifying the equipment space design, and the first strip-shaped conductive connector (welding wire or welding strip) and the second strip-shaped conductive connector (welding wire or welding strip) Breakage, deviation and other fault maintenance and line replacement operations are also greatly simplified.

[0025] During the winding process of the present invention, the first strip-shaped conductive connecting member (welding wire or welding strip) and the second strip-shaped conductive connecting member (welding wire or welding strip) have little deviation; after the first strip-shaped conductive connecting member (welding wire or welding strip) is discharged from the reel, it can directly reach the side circumference of the welding carrier, and be wound along the wiring groove and tightly wrapped around the side circumference of the welding carrier, which can completely eliminate the conventional actions of cutting, clamping, stretching, and transporting the first strip-shaped conductive connecting member (welding wire or welding strip), and almost completely eliminate the possibility of deviation of the first strip-shaped conductive connecting member (welding wire or welding strip); after the second strip-shaped conductive connecting member (welding wire or welding strip) is discharged from the reel, it can directly reach the battery cell, and be aligned with the grid line on the battery cell and tightened and fixed, which can completely eliminate the conventional actions of cutting, clamping, stretching, and transporting the second strip-shaped conductive connecting member (welding wire or welding strip), and almost completely eliminate the possibility of deviation of the second strip-shaped conductive connecting member (welding wire or welding strip).

[0026] The present invention can weld a large number of first strip-shaped conductive connector segments and second strip-shaped conductive connector segments (the first strip-shaped conductive connector segments and the second strip-shaped conductive connector segments are used for the series connection of the battery slices on which they are located) on a single battery slice at one time, and can weld and form hundreds of first strip-shaped conductive connector segments and second strip-shaped conductive connector segments on a single battery slice at one time. Theoretically, the final number of first strip-shaped conductive connector segments on a single battery slice is equal to the number of rotations of the side circumference of the welding carrier when the first strip-shaped conductive connector is wound, and the final number of second strip-shaped conductive connector segments on a single battery slice is equal to the number of rotations of the side circumference of the welding carrier when the second strip-shaped conductive connector is wound; it is easy to control and implement.

[0027] The present invention can be applied to the welding of special-shaped welding strips (such as triangular welding strips) that require direction identification. When the first strip-shaped conductive connector is wrapped with a triangular welding strip, the wiring groove (V-shaped groove) can support the triangular welding strip that is routed therein to keep the bottom surface facing outward, so as to prevent the triangular welding strip from twisting when routing in the wiring groove, and can eventually make the bottom surface of the triangular welding strip face the inner side surface of the battery cell, so that the first strip-shaped conductive connector (triangular welding strip) can eventually be stably attached to the corresponding grid line on the inner side surface of the battery cell. When the second strip-shaped conductive connector is wrapped with a triangular welding strip, the bearing surface (the convex arc surface) can automatically correct the direction of the top angle of the triangular welding strip, so that the top angle of the triangular welding strip faces upward and the bottom surface faces downward. The present invention can realize the welding of special-shaped welding strips such as triangular welding strips, and the triangular welding strips are not easy to flip and have a high yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figures 1 to 5 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0030] The present invention provides a double-sided welding method for a solar cell, which comprises welding strip-shaped conductive connectors on both sides of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors comprise a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively arranged on both sides of the cell; and the method comprises the following steps:

[0031] A carrying surface for placing the battery cell is provided on the outer surface of a welding carrier, and the carrying surface is an outwardly convex arc surface (which can be a circular arc surface), and the arc height of the arc surface is not greater than one-fourth of the arc length; a wiring groove for placing the first strip-shaped conductive connecting member is provided on the carrying surface, and the wiring groove extends along the circumference of the carrying surface (that is, the extension direction of the wiring groove is perpendicular to the axis of the carrying surface), and the wiring groove is a through groove on the carrying surface;

[0032] Pre-arrange the first strip-shaped conductive connection member, so that the first strip-shaped conductive connection member is routed in the routing groove (the routing groove restricts the first strip-shaped conductive connection member therein to extend in the same direction as the routing groove), and the first strip-shaped conductive connection member protrudes from the routing groove (that is, the first strip-shaped conductive connection member protrudes from the bearing surface);

[0033] Then, the battery cell is placed on the carrying surface so that the battery cell does not protrude beyond the carrying surface, so that the side surface of the first strip-shaped conductive connecting member to be welded on the battery cell faces the carrying surface (that is, the side surface of the second strip-shaped conductive connecting member to be welded on the battery cell faces away from the carrying surface), and the inner side surface of the battery cell (that is, the side surface of the battery cell facing the carrying surface) is attached to the first strip-shaped conductive connecting member protruding from the carrying surface;

[0034] Then, the second strip-shaped conductive connector is stretched and attached to the outer side surface of the battery cell (i.e., the side surface of the battery cell opposite to the supporting surface) along the circumference of the supporting surface, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the supporting surface;

[0035] Then, the first strip-shaped conductive connection member and the second strip-shaped conductive connection member are heated by direct heating, infrared heating or hot air heating, so that the first strip-shaped conductive connection member and the second strip-shaped conductive connection member are welded on the battery cell;

[0036] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off, so that a small segment of the first strip-shaped conductive connector and a small segment of the second strip-shaped conductive connector remain on the battery cell, and the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector are used for connecting the battery cells where they are located in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell where they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell where they are located);

[0037] Then remove the battery cell from the carrying surface of the welding carrier (after welding the strip-shaped conductive connectors on both sides of the battery cell).

[0038] Specific:

[0039] 1) The carrying surface can have a vacuum adsorption function (for example, the carrying surface can be evenly distributed with exhaust ports, and vacuum adsorption is performed through the exhaust ports); when placing the battery cell on the carrying surface, the battery cell is vacuum adsorbed through the carrying surface, so that the battery cell is stably adsorbed on the carrying surface.

[0040] 2) The welding carrier can be provided with a heating function, and the first strip-shaped conductive connector on the carrier surface, the battery cell, and the second strip-shaped conductive connector on the outer surface of the battery cell can be heated by the welding carrier.

[0041] 3) If the inner side of the cell is provided with multiple parallel grid lines;

[0042] A plurality of parallel wiring grooves are arranged on the bearing surface (so that the wiring grooves on the bearing surface correspond to the inner side grid lines of the battery cells placed on the bearing surface one by one), so that each wiring groove extends along the circumference of the bearing surface (that is, the extension direction of each wiring groove is perpendicular to the axis of the bearing surface), and each wiring groove is a through groove;

[0043] When the first strip-shaped conductive connector is pre-placed, the first strip-shaped conductive connector is routed in each routing groove (the routing groove restricts the first strip-shaped conductive connector therein to extend in the same direction as the routing groove), and the first strip-shaped conductive connector protrudes from the routing groove where it is located (that is, the first strip-shaped conductive connector protrudes from the bearing surface);

[0044] When placing the cell on the carrier surface, the extension direction of the grid lines on the inner side of the cell is perpendicular to the axis of the carrier surface, and the grid lines on the inner side of the cell are correspondingly fitted with the first strip-shaped conductive connectors protruding from the carrier surface in each routing groove on the carrier surface.

[0045] 4) If the outer side of the cell is provided with multiple parallel grid lines (the grid lines on the outer side of the cell can be parallel to the grid lines on the inner side of the cell);

[0046] When the second strip-shaped conductive connecting member is stretched and tightly fitted on the outer side of the battery cell, the second strip-shaped conductive connecting member is correspondingly fitted with the grid lines on the outer side of the battery cell.

[0047] 5) The strip-shaped conductive connecting member (the first strip-shaped conductive connecting member, the second strip-shaped conductive connecting member) may be a welding wire or a welding strip;

[0048] If the strip-shaped conductive connecting member (the first strip-shaped conductive connecting member, the second strip-shaped conductive connecting member) has a flat bottom surface for welding with the battery cell (for example, the cross-sectional shape of the first strip-shaped conductive connecting member, the second strip-shaped conductive connecting member is a triangle or a rectangle);

[0049] The wiring groove can support the first strip-shaped conductive connector for routing therein to keep the flat bottom surface opposite to the bearing surface, so as to prevent the first strip-shaped conductive connector from twisting when routing in the wiring groove (for example, the cross-sectional shape of the wiring groove is matched with the cross-sectional shape of the first strip-shaped conductive connector, and the first strip-shaped conductive connector is embedded in the wiring groove for routing); and when pre-setting the first strip-shaped conductive connector, the flat bottom surface of the first strip-shaped conductive connector is arranged opposite to the bearing surface, so that the first strip-shaped conductive connector can finally be stably attached to the inner side surface of the battery cell;

[0050] For example, the first strip-shaped conductive connection member may be a triangular welding strip; the wiring groove is a V-shaped groove into which the top corner of the triangular welding strip can be embedded; when the first strip-shaped conductive connection member is routed in the wiring groove, the top corner of the first strip-shaped conductive connection member is embedded in the wiring groove, and the bottom surface of the first strip-shaped conductive connection member protrudes from the wiring groove;

[0051] When the second strip-shaped conductive connecting member is stretched and attached to the outer side of the battery cell, the flat bottom surface of the second strip-shaped conductive connecting member faces the outer side surface of the battery cell, so that the second strip-shaped conductive connecting member is stably attached to the outer side surface of the battery cell;

[0052] For example, the second strip-shaped conductive connector can be a triangular welding strip; when the second strip-shaped conductive connector (triangular welding strip) is stretched and fitted tightly to the outer side of the battery cell, the bottom surface of the triangular welding strip is directed toward the outer side surface of the battery cell (that is, the top angle of the triangular welding strip is opposite to the outer side surface of the battery cell), so that the second strip-shaped conductive connector (triangular welding strip) is stably fitted to the outer side surface of the battery cell.

[0053] 6) If Figure 1 As shown, the second strip-shaped conductive connector can be stretched and fitted to the outer surface of the battery cell by making it cross the battery cell along the circumference of the supporting surface and pulling the sections of the second strip-shaped conductive connector located outside the two sides of the battery cell toward the welding carrier and / or the supporting surface.

[0054] 7) If Figures 2 to 5As shown, the welding carrier can also be provided with a rotating shaft, and the outer surface of the welding carrier includes a side circumferential surface surrounding the rotating shaft; the bearing surface is located on the side circumferential surface of the welding carrier, and the axis of the bearing surface is parallel to or colinear with the axis of the rotating shaft; and the first strip-shaped conductive connector is pre-placed by winding the first strip-shaped conductive connector along the wiring groove and tightly wrapping the side circumferential surface of the welding carrier; and the second strip-shaped conductive connector is tightly fitted on the outer surface of the battery cell by winding the second strip-shaped conductive connector along the circumferential direction of the side circumferential surface of the welding carrier and tightly wrapping the battery cell on the side circumferential surface of the welding carrier;

[0055] In addition, if the axis of the rotating shaft is located on the center line of the welding carrier, when the first strip-shaped conductive connection piece is wound along the wiring groove and tightly wrapped around the side circumference of the welding carrier, the side circumference of the welding carrier is rotated around the axis of the rotating shaft to facilitate the winding of the first strip-shaped conductive connection piece; and when the second strip-shaped conductive connection piece is wound along the circumferential direction of the side circumference of the welding carrier and tightly wrapped around the battery cell on the side circumference of the welding carrier, the side circumference of the welding carrier is rotated around the axis of the rotating shaft to facilitate the winding of the second strip-shaped conductive connection piece;

[0056] Moreover, only one first strip-shaped conductive connection member may be used to realize that the first strip-shaped conductive connection member is wound along the wiring groove and tightly wound around the side circumference of the welding carrier; only one second strip-shaped conductive connection member may be used to realize that the second strip-shaped conductive connection member is wound around the side circumference of the welding carrier and tightly wound around the battery cell on the side circumference of the welding carrier;

[0057] More preferably, multiple rows of bearing surfaces with wiring grooves can be arranged on the side circumference of the welding carrier, so that each row of bearing surfaces is arranged in sequence along the circumference of the side circumference of the welding carrier, and the bearing surfaces in the same row are arranged in sequence along the axial direction of the rotating shaft, and the axis of each bearing surface is parallel or colinear with the axis of the rotating shaft; more specifically, the multiple rows of bearing surfaces can be evenly distributed along the circumference of the side circumference of the welding carrier, and even the bearing surfaces can be evenly distributed on the side circumference of the welding carrier; battery cells are respectively placed on the multiple rows of bearing surfaces (the multiple rows of bearing surfaces are pre-wound with the first strip-shaped conductive connector), so that the second strip-shaped conductive connector can be wrapped around multiple rows of battery cells at a time, and finally multiple rows of battery cells can be welded at one time (the welding of the first strip-shaped conductive connector and the second strip-shaped conductive connector on multiple rows of battery cells is completed simultaneously), which can improve the welding efficiency.

[0058] The specific embodiment of the present invention using the method of winding the first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member is as follows:

[0059] Example 1

[0060] like Figure 2As shown, this embodiment provides a double-sided welding method for a solar cell, wherein strip-shaped conductive connectors are welded on both side surfaces of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors include a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively disposed on both side surfaces of the cell; and a plurality of parallel grid lines are disposed on the inner side surface of the cell; and a plurality of parallel grid lines are also disposed on the outer side surface of the cell, and the grid lines on the outer side surface of the cell are parallel to the grid lines on the inner side surface of the cell);

[0061] The double-sided welding method of a solar cell comprises the following steps:

[0062] A welding carrier with a rotating shaft is provided, so that the axis of the rotating shaft is located on the center line of the welding carrier, and the welding carrier has a side circumferential surface surrounding the rotating shaft; a pair of bearing surfaces for placing battery cells are provided on the side circumferential surface of the welding carrier, so that the pair of bearing surfaces are both convex arc surfaces (can be circular arc surfaces), the pair of bearing surfaces are symmetrically arranged, and the axis centers of the pair of bearing surfaces are parallel or colinear with the axis center of the rotating shaft; a plurality of parallel wiring grooves are respectively provided on the pair of bearing surfaces (so that the wiring grooves on the bearing surfaces are aligned with the inner side grid lines of the battery cells placed on the bearing surfaces one by one Correspondingly, the wiring grooves on the same bearing surface can be arranged at equal intervals), each wiring groove can be an annular groove that surrounds the side circumference of the welding carrier and is perpendicular to the rotating shaft; the wiring groove is used for the first strip-shaped conductive connecting member to be routed when it is wrapped around the side circumference of the welding carrier (the wiring groove can limit the first strip-shaped conductive connecting member routed therein to extend in the same direction as it); the pair of bearing surfaces are respectively provided with vacuum adsorption functions (for example, the pair of bearing surfaces are respectively evenly provided with exhaust ports, and vacuum adsorption can be performed through the exhaust ports); the welding carrier is provided with a heating function that can heat the pair of bearing surfaces;

[0063] Then, the first strip-shaped conductive connector is pre-set by winding the first strip-shaped conductive connector along the circumferential direction of the side circumference of the welding carrier and tightening the side circumference of the welding carrier; and the first strip-shaped conductive connector is routed in each routing groove, and the first strip-shaped conductive connector is protruded from each routing groove (that is, the first strip-shaped conductive connector is protruded from each bearing surface); specifically, only one first strip-shaped conductive connector can be used for winding; the first strip-shaped conductive connector can be a flat welding strip, and when winding the flat welding strip, the bottom surface of the flat welding strip is facing outward, and the bottom surface of the flat welding strip can finally be made to face the inner side surface of the battery cell, so that the flat welding strip can finally be stably attached to the corresponding grid line on the inner side surface of the battery cell; and when winding the first strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the first strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby realizing the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0064] Then, the battery cells are respectively placed on the pair of supporting surfaces, so that the battery cells do not extend beyond the supporting surfaces to which they are attached, and one side surface of the first strip-shaped conductive connector to be welded on the battery cell faces the corresponding supporting surface (that is, the one side surface of the second strip-shaped conductive connector to be welded on the battery cell faces away from the corresponding supporting surface), and the extension direction of the grid lines on the inner side surface of the battery cell (that is, the side surface of the battery cell facing the corresponding supporting surface) is perpendicular to the axis of the corresponding supporting surface (that is, perpendicular to the axis of the rotating shaft), and the grid lines on the inner side surface of the battery cell are correspondingly attached to the first strip-shaped conductive connector protruding from the supporting surface in each routing groove on the corresponding supporting surface; and the battery cell on the supporting surface is vacuum-adsorbed so that the battery cell is stably adsorbed on the corresponding supporting surface;

[0065] Then, the second strip-shaped conductive connector is wound around the circumferential surface of the welding carrier and the battery cells on the circumferential surface of the welding carrier are tightly wound, so that the second strip-shaped conductive connector is tightly fitted on the outer side of each battery cell, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the carrier surface; and when the second strip-shaped conductive connector is wound, the second strip-shaped conductive connector is correspondingly fitted with the grid lines on the outer side of the battery cell; specifically, only one second strip-shaped conductive connector can be used for winding; the second strip-shaped conductive connector The connecting piece may be a flat welding strip, and when the flat welding strip is wound, the bottom surface of the flat welding strip is directed toward the outer side surface of the battery cell, so that the flat welding strip is stably attached to the corresponding grid line on the outer side surface of the battery cell; and when the second strip-shaped conductive connecting piece is wound, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the second strip-shaped conductive connecting piece; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby realizing the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0066] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are heated, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; specifically: 1) the first strip-shaped conductive connector, the battery cell and the second strip-shaped conductive connector on the outer side of the battery cell on each carrier surface can be heated by a welding carrier, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; 2) infrared heating can also be used (such as using linear infrared to irradiate the outer side surface of each battery cell and the second strip-shaped conductive connector on the outer side surface) to heat each battery cell and the first strip-shaped conductive connector and the second strip-shaped conductive connector on both sides of the battery cell, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell;

[0067] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off, so that a small segment of the first strip-shaped conductive connector and a small segment of the second strip-shaped conductive connector remain on the battery cell, and the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector are used for connecting the battery cells where they are located in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell where they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell where they are located);

[0068] Then, each battery cell is removed from the corresponding supporting surface of the welding carrier (after welding the strip-shaped conductive connectors on both sides of the battery cell).

[0069] Example 2

[0070] like Figure 3 As shown, this embodiment provides a double-sided welding method for a solar cell, wherein strip-shaped conductive connectors are welded on both side surfaces of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors include a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively disposed on both side surfaces of the cell; and a plurality of parallel grid lines are disposed on the inner side surface of the cell; and a plurality of parallel grid lines are also disposed on the outer side surface of the cell, and the grid lines on the outer side surface of the cell are parallel to the grid lines on the inner side surface of the cell);

[0071] The double-sided welding method of a solar cell comprises the following steps:

[0072] A welding carrier with a rotating shaft is provided, and the axis of the rotating shaft is located on the center line of the welding carrier; the welding carrier has a side circumferential surface surrounding the rotating shaft, and the side circumferential surface of the welding carrier is surrounded by a plurality of bearing surfaces for battery cells to be placed (the main body of the welding carrier can be a prism with a coaxial center with the rotating shaft); the plurality of bearing surfaces are all convex arc surfaces (can be circular arc surfaces), and the axis centers of the plurality of bearing surfaces are parallel to or colinear with the axis center of the rotating shaft; a plurality of parallel wiring grooves are respectively provided on the plurality of bearing surfaces (the wiring grooves on the bearing surfaces are aligned with the inner surface of the battery cells placed on the bearing surfaces); The side grid lines are matched one by one, so that the wiring grooves on the same bearing surface can be arranged at equal intervals), each wiring groove can be an annular groove that surrounds the side circumference of the welding carrier and is perpendicular to the rotating shaft; the wiring groove is used for the first strip-shaped conductive connecting member to be routed when it is wrapped around the side circumference of the welding carrier (the wiring groove can limit the first strip-shaped conductive connecting member routed therein to extend in the same direction as it); the multiple bearing surfaces are respectively provided with a vacuum adsorption function (for example, the multiple bearing surfaces are respectively evenly provided with exhaust ports, and vacuum adsorption can be performed through the exhaust ports); the welding carrier has a heating function that can heat the multiple bearing surfaces;

[0073] Then, the first strip-shaped conductive connector is pre-placed by winding the first strip-shaped conductive connector along the circumferential direction of the side circumference of the welding carrier and tightening the side circumference of the welding carrier; and the first strip-shaped conductive connector is routed in each routing groove, and the first strip-shaped conductive connector is protruded from each routing groove (that is, the first strip-shaped conductive connector is protruded from each bearing surface); specifically, only one first strip-shaped conductive connector can be used for winding; the first strip-shaped conductive connector can be a round wire welding strip; and when winding the first strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the first strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby achieving the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0074] Then, the battery cells are respectively placed on the multiple carrying surfaces, so that the battery cells do not extend beyond the carrying surfaces to which they are attached, and one side surface of the first strip-shaped conductive connector to be welded on the battery cell faces the corresponding carrying surface (that is, the one side surface of the second strip-shaped conductive connector to be welded on the battery cell faces away from the corresponding carrying surface), and the extension direction of the grid lines on the inner side surface of the battery cell (that is, the side surface of the battery cell facing the corresponding carrying surface) is perpendicular to the axis of the corresponding carrying surface (that is, perpendicular to the axis of the rotating shaft), and the grid lines on the inner side surface of the battery cell are correspondingly attached to the first strip-shaped conductive connector protruding from the carrying surface in each routing groove on the corresponding carrying surface; and the battery cell on the carrying surface is vacuum-adsorbed so that the battery cell is stably adsorbed on the corresponding carrying surface;

[0075] Then, by making the second strip-shaped conductive connector wrap around the circumference of the side surface of the welding carrier and tighten the battery cells on the side surface of the welding carrier, the second strip-shaped conductive connector is tightened and fitted on the outer side surface of each battery cell, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the bearing surface; and when winding the second strip-shaped conductive connector, the second strip-shaped conductive connector is correspondingly fitted with the grid lines on the outer side surface of the battery cell; specifically, only one second strip-shaped conductive connector can be used for winding; the second strip-shaped conductive connector can be a round wire welding strip; and when winding the second strip-shaped conductive connector, the side surface of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the second strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier is driven to rotate as a whole by the rotating shaft, thereby realizing the rotation of the side surface of the welding carrier around the axis of the rotating shaft;

[0076] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are heated, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; specifically: 1) the first strip-shaped conductive connector, the battery cell and the second strip-shaped conductive connector on the outer side of the battery cell on each carrier surface can be heated by a welding carrier, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; 2) hot air heating can also be used (such as using hot air to blow the outer side surface of each battery cell and the second strip-shaped conductive connector on the outer side surface) to heat each battery cell and the first strip-shaped conductive connector and the second strip-shaped conductive connector on both sides of the battery cell, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell;

[0077] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off, so that a small segment of the first strip-shaped conductive connector and a small segment of the second strip-shaped conductive connector remain on the battery cell, and the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector are used for connecting the battery cells where they are located in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell where they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell where they are located);

[0078] Then, each battery cell is removed from the corresponding supporting surface of the welding carrier (after welding the strip-shaped conductive connectors on both sides of the battery cell).

[0079] Example 3

[0080] like Figure 4 As shown, this embodiment provides a double-sided welding method for a solar cell, wherein strip-shaped conductive connectors are welded on both side surfaces of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors include a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively disposed on both side surfaces of the cell; and a plurality of parallel grid lines are disposed on the inner side surface of the cell; and a plurality of parallel grid lines are also disposed on the outer side surface of the cell, and the grid lines on the outer side surface of the cell are parallel to the grid lines on the inner side surface of the cell);

[0081] The double-sided welding method of a solar cell comprises the following steps:

[0082] A welding carrier with a rotating shaft is provided, and the axis of the rotating shaft is located on the center line of the welding carrier; the welding carrier has a side circumferential surface surrounding the rotating shaft, and the side circumferential surface of the welding carrier is a circumferential surface coaxial with the rotating shaft (the main body of the welding carrier can be a cylinder coaxial with the rotating shaft); a plurality of arc surface areas are divided on the side circumferential surface of the welding carrier and are sequentially spaced along the circumferential direction of the side circumferential surface, and the plurality of arc surface areas are evenly distributed along the circumferential direction of the side circumferential surface of the welding carrier; each arc surface area is a bearing surface for placing a battery cell; a plurality of parallel wiring grooves are respectively provided on each bearing surface (the wiring grooves on the bearing surface and the inner side grid lines of the battery cell placed on the bearing surface are parallel to each other). One-to-one matching can make the wiring grooves on the same bearing surface be arranged at equal intervals), so that each wiring groove is an annular groove that surrounds the side circumference of the welding carrier and is coaxial with the rotating shaft, and each wiring groove is a V-shaped groove for the top angle of the triangular welding belt to be embedded; the wiring groove is used for the first strip-shaped conductive connecting member (using a triangular welding belt) to be routed when it is wrapped around the side circumference of the welding carrier (the wiring groove can limit the first strip-shaped conductive connecting member / triangular welding belt routed therein to extend in the same direction as it); each bearing surface has a vacuum adsorption function (for example, each bearing surface is evenly provided with an exhaust port, and vacuum adsorption can be performed through the exhaust port); the welding carrier has a heating function that can heat each bearing surface;

[0083] Then, the first strip-shaped conductive connector is pre-placed by winding the first strip-shaped conductive connector along the circumferential direction of the side surface of the welding carrier and tightening the side surface of the welding carrier; and the first strip-shaped conductive connector is routed in each routing groove, and the first strip-shaped conductive connector protrudes from each routing groove (that is, the first strip-shaped conductive connector protrudes from each bearing surface); specifically, only one first strip-shaped conductive connector can be used for winding; the first strip-shaped conductive connector can be a triangular welding strip, and when winding the triangular welding strip, the top angle of the triangular welding strip is embedded in the routing groove (V-shaped groove), and the flat bottom surface of the triangular welding strip protrudes from the routing groove; the routing groove (V-shaped groove) can The triangular welding strip supporting the wiring inside is kept with the bottom facing outward to prevent the triangular welding strip from twisting when the wiring is routed in the wiring groove, and the bottom surface of the triangular welding strip can eventually face the inner side surface of the battery cell, so that the first strip-shaped conductive connector (triangular welding strip) can finally be stably attached to the corresponding grid line on the inner side surface of the battery cell; and when winding the first strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the first strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby realizing the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0084] Then, the battery cells are respectively placed on each carrying surface so that the battery cells do not extend beyond the carrying surface to which they are attached, and one side surface of the first strip-shaped conductive connector to be welded on the battery cell faces the corresponding carrying surface (that is, one side surface of the second strip-shaped conductive connector to be welded on the battery cell faces away from the corresponding carrying surface), and the extension direction of the grid lines on the inner side surface of the battery cell (that is, the side surface of the battery cell facing the corresponding carrying surface) is perpendicular to the axis of the corresponding carrying surface (that is, perpendicular to the axis of the rotating shaft), and the grid lines on the inner side surface of the battery cell are correspondingly attached to the first strip-shaped conductive connector protruding from the carrying surface in each routing groove on the corresponding carrying surface; and the battery cell on it is vacuum-adsorbed by the carrying surface so that the battery cell is stably adsorbed on the corresponding carrying surface;

[0085] Then, the second strip-shaped conductive connector is wound around the circumferential surface of the welding carrier and the battery cells on the circumferential surface of the welding carrier are tightly wound, so that the second strip-shaped conductive connector is tightly fitted on the outer side of each battery cell, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the carrier surface; and when the second strip-shaped conductive connector is wound, the second strip-shaped conductive connector is correspondingly fitted with the grid lines on the outer side of the battery cell; specifically, only one second strip-shaped conductive connector can be used for winding; the second strip-shaped conductive connector can be a triangular welding strip, and when the triangular welding strip is wound, the bottom surface of the triangular welding strip is facing the outer side of the battery cell (that is, the top angle of the triangular welding strip is aligned with the outer side of the battery cell) The triangular welding strip is wound in a manner that the bottom surface of the triangular welding strip is in contact with the outer side surface of the battery cell, and the bottom surface of the triangular welding strip is in contact with the outer side surface of the battery cell, so that the triangular welding strip can automatically correct the vertex direction during the winding process, so that the vertex is facing upward and the bottom surface is facing downward, thereby achieving stable contact with the outer side surface of the battery cell; and when winding the second strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the second strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby achieving the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0086] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are heated, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; specifically: 1) the first strip-shaped conductive connector, the battery cell and the second strip-shaped conductive connector on the outer side of the battery cell on each carrier surface can be heated by a welding carrier, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; 2) hot air heating can also be used (such as using hot air to blow the outer side surface of each battery cell and the second strip-shaped conductive connector on the outer side surface) to heat each battery cell and the first strip-shaped conductive connector and the second strip-shaped conductive connector on both sides of the battery cell, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell;

[0087] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off, so that a small segment of the first strip-shaped conductive connector and a small segment of the second strip-shaped conductive connector remain on the battery cell, and the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector are used for connecting the battery cells where they are located in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell where they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell where they are located);

[0088] Then, each battery cell is removed from the corresponding supporting surface of the welding carrier (after welding the strip-shaped conductive connectors on both sides of the battery cell).

[0089] Example 4

[0090] like Figure 5 As shown, this embodiment provides a double-sided welding method for a solar cell, wherein strip-shaped conductive connectors are welded on both side surfaces of the cell (i.e., the front and back sides of the cell); the strip-shaped conductive connectors include a first strip-shaped conductive connector and a second strip-shaped conductive connector respectively disposed on both side surfaces of the cell; and a plurality of parallel grid lines are disposed on the inner side surface of the cell; and a plurality of parallel grid lines are also disposed on the outer side surface of the cell, and the grid lines on the outer side surface of the cell are parallel to the grid lines on the inner side surface of the cell);

[0091] The double-sided welding method of a solar cell comprises the following steps:

[0092] A welding carrier with a rotating shaft is provided, and the axis of the rotating shaft is located on the center line of the welding carrier; the welding carrier has a side circumferential surface surrounding the rotating shaft, and the side circumferential surface of the welding carrier is a circumferential surface coaxial with the rotating shaft (the main body of the welding carrier can be a cylinder coaxial with the rotating shaft); a plurality of rows of arc surface areas are divided on the side circumferential surface of the welding carrier, and the arc surface areas of each row are arranged in sequence along the circumferential direction of the side circumferential surface of the welding carrier, and the arc surface areas of the same row are arranged in sequence along the axial direction of the rotating shaft; each arc surface area is a bearing surface for placing a battery cell; a plurality of parallel wiring grooves are respectively provided on each bearing surface (so that the wiring grooves on the bearing surface are parallel to the battery cell placed on the bearing surface) The inner side grid lines of the welding carrier are matched one by one, so that the wiring grooves on the same bearing surface are arranged at equal intervals), so that each wiring groove is an annular groove that surrounds the side circumference of the welding carrier and is coaxial with the rotating shaft, and each wiring groove is a V-shaped groove for the top angle of the triangular welding belt to be embedded; the wiring groove is used for the first strip-shaped conductive connecting member (using a triangular welding belt) to be routed when it is wrapped around the side circumference of the welding carrier (the wiring groove can limit the first strip-shaped conductive connecting member / triangular welding belt routed therein to extend in the same direction as it); each bearing surface has a vacuum adsorption function (for example, each bearing surface is evenly provided with an exhaust port, and vacuum adsorption can be performed through the exhaust port); the welding carrier has a heating function that can heat each bearing surface;

[0093] Then, the first strip-shaped conductive connector is pre-placed by winding the first strip-shaped conductive connector along the circumferential direction of the side surface of the welding carrier and tightening the side surface of the welding carrier; and the first strip-shaped conductive connector is routed in each routing groove, and the first strip-shaped conductive connector protrudes from each routing groove (that is, the first strip-shaped conductive connector protrudes from each bearing surface); specifically, only one first strip-shaped conductive connector can be used for winding; the first strip-shaped conductive connector can be a triangular welding strip, and when winding the triangular welding strip, the top angle of the triangular welding strip is embedded in the routing groove (V-shaped groove), and the flat bottom surface of the triangular welding strip protrudes from the routing groove; the routing groove (V-shaped groove) can The triangular welding strip supporting the wiring inside is kept with the bottom facing outward to prevent the triangular welding strip from twisting when the wiring is routed in the wiring groove, and the bottom surface of the triangular welding strip can eventually face the inner side surface of the battery cell, so that the first strip-shaped conductive connector (triangular welding strip) can finally be stably attached to the corresponding grid line on the inner side surface of the battery cell; and when winding the first strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the first strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby realizing the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0094] Then, the battery cells are respectively placed on each carrying surface so that the battery cells do not extend beyond the carrying surface to which they are attached, and one side surface of the first strip-shaped conductive connector to be welded on the battery cell faces the corresponding carrying surface (that is, one side surface of the second strip-shaped conductive connector to be welded on the battery cell faces away from the corresponding carrying surface), and the extension direction of the grid lines on the inner side surface of the battery cell (that is, the side surface of the battery cell facing the corresponding carrying surface) is perpendicular to the axis of the corresponding carrying surface (that is, perpendicular to the axis of the rotating shaft), and the grid lines on the inner side surface of the battery cell are correspondingly attached to the first strip-shaped conductive connector protruding from the carrying surface in each routing groove on the corresponding carrying surface; and the battery cell on it is vacuum-adsorbed by the carrying surface so that the battery cell is stably adsorbed on the corresponding carrying surface;

[0095] Then, the second strip-shaped conductive connector is wound around the circumferential surface of the welding carrier and the battery cells on the circumferential surface of the welding carrier are tightly wound, so that the second strip-shaped conductive connector is tightly fitted on the outer side of each battery cell, and then the second strip-shaped conductive connector presses the battery cell onto the first strip-shaped conductive connector protruding from the carrier surface; and when the second strip-shaped conductive connector is wound, the second strip-shaped conductive connector is correspondingly fitted with the grid lines on the outer side of the battery cell; specifically, only one second strip-shaped conductive connector can be used for winding; the second strip-shaped conductive connector can be a triangular welding strip, and when the triangular welding strip is wound, the bottom surface of the triangular welding strip is facing the outer side of the battery cell (that is, the top angle of the triangular welding strip is aligned with the outer side of the battery cell) The triangular welding strip is wound in a manner that the bottom surface of the triangular welding strip is in contact with the outer side surface of the battery cell, and the bottom surface of the triangular welding strip is in contact with the outer side surface of the battery cell, so that the triangular welding strip can automatically correct the vertex direction during the winding process, so that the vertex is facing upward and the bottom surface is facing downward, thereby achieving stable contact with the outer side surface of the battery cell; and when winding the second strip-shaped conductive connector, the side circumference of the welding carrier is rotated around the axis of the rotating shaft, which can facilitate the winding of the second strip-shaped conductive connector; more specifically, the rotating shaft can be driven to rotate around its own axis by an external mechanism (such as a motor), and the welding carrier can be driven to rotate as a whole by the rotating shaft, thereby achieving the rotation of the side circumference of the welding carrier around the axis of the rotating shaft;

[0096] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are heated, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; specifically: 1) the first strip-shaped conductive connector, the battery cell and the second strip-shaped conductive connector on the outer side of the battery cell on each carrier surface can be heated by a welding carrier, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell; 2) infrared heating can also be used (such as using linear infrared to irradiate the outer side surface of each battery cell and the second strip-shaped conductive connector on the outer side surface) to heat each battery cell and the first strip-shaped conductive connector and the second strip-shaped conductive connector on both sides of the battery cell, so that the first strip-shaped conductive connector and the second strip-shaped conductive connector are synchronously welded on each battery cell;

[0097] Then, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off, so that a small segment of the first strip-shaped conductive connector and a small segment of the second strip-shaped conductive connector remain on the battery cell, and the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector are used for connecting the battery cells where they are located in series (one end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector exceeds the battery cell where they are located, and the other end of the small segment of the first strip-shaped conductive connector and the small segment of the second strip-shaped conductive connector does not exceed the battery cell where they are located);

[0098] Then, each battery cell is removed from the corresponding supporting surface of the welding carrier (after welding the strip-shaped conductive connectors on both sides of the battery cell).

[0099] Embodiment 4 can wind multiple rows of battery cells at one time and weld multiple rows of battery cells at one time, and weld strip-shaped conductive connectors (first strip-shaped conductive connectors and second strip-shaped conductive connectors) on both sides of multiple rows of battery cells at one time, thereby improving welding efficiency.

[0100] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-sided welding method for a solar cell, characterized in that: The steps include: A bearing surface for placing the battery cell is provided on the outer surface of a welding carrier, and the bearing surface is an outwardly convex arc surface; a wiring groove for placing the first strip-shaped conductive connecting member is provided on the bearing surface, and the wiring groove extends along the circumference of the bearing surface, and the wiring groove is a through groove; Pre-arrange a first strip-shaped conductive connection member, so that the first strip-shaped conductive connection member is routed in the wiring groove and protrudes from the wiring groove; Placing the battery cell on the carrying surface, so that the surface of one side of the battery cell to be welded with the first strip-shaped conductive connecting member faces the carrying surface, and the inner side surface of the battery cell is attached to the first strip-shaped conductive connecting member; The second strip-shaped conductive connector is made to cross the battery cell along the circumferential direction of the carrying surface, and the sections of the second strip-shaped conductive connector located outside the two sides of the battery cell are pulled tight toward the welding carrier, so that the second strip-shaped conductive connector is tightly attached to the outer surface of the battery cell; The first strip-shaped conductive connection member and the second strip-shaped conductive connection member are heated so that the first strip-shaped conductive connection member and the second strip-shaped conductive connection member are both welded on the battery sheet.

2. The method for double-sided welding of a solar cell according to claim 1, characterized in that: The inner side surface of the battery cell is provided with a plurality of parallel grid lines; A plurality of parallel wiring grooves are arranged on the bearing surface, so that each wiring groove extends along the circumference of the bearing surface and each wiring groove is a through groove; When pre-setting the first strip-shaped conductive connector, the first strip-shaped conductive connector is arranged in each wiring groove, and the first strip-shaped conductive connector protrudes from the wiring groove where it is located; When placing the cell on the carrier surface, the extension direction of the grid lines on the inner side of the cell is perpendicular to the axis of the carrier surface, and the grid lines on the inner side of the cell are correspondingly fitted with the first strip-shaped conductive connectors in each routing groove on the carrier surface.

3. The double-sided welding method of a solar cell according to claim 2, characterized in that: A plurality of parallel grid lines are arranged on the outer side of the battery cell; When the second strip-shaped conductive connecting member is stretched and tightly fitted on the outer side of the battery cell, the second strip-shaped conductive connecting member is correspondingly fitted with the grid lines on the outer side of the battery cell.

4. The method for double-sided welding of a solar cell according to claim 1, 2 or 3, characterized in that: The welding carrier is provided with a rotating shaft, and the outer surface of the welding carrier includes a side circumferential surface surrounding the rotating shaft; the bearing surface is located on the side circumferential surface of the welding carrier, and the axis of the bearing surface is parallel or colinear with the axis of the rotating shaft; The first strip-shaped conductive connecting member is pre-placed by making the first strip-shaped conductive connecting member be wound along the wiring groove and tightly wound around the side surface of the welding carrier.

5. The double-sided welding method of a solar cell according to claim 4, characterized in that: The second strip-shaped conductive connector is wound around the circumferential surface of the welding carrier and tightly wrapped around the battery cell on the circumferential surface of the welding carrier, so that the second strip-shaped conductive connector is tightly attached to the outer surface of the battery cell.

6. The method for double-sided welding of a solar cell according to claim 5, characterized in that: Make sure the axis of the rotating shaft is located on the center line of the welding carrier.

7. The double-sided welding method of a solar cell according to claim 5, characterized in that: When the first strip-shaped conductive connecting member is wound along the wiring groove and tightly wrapped around the side circumference of the welding carrier, the side circumference of the welding carrier is rotated around the axis of the rotating shaft; When the second strip-shaped conductive connecting member is wound around the circumferential direction of the side circumference of the welding carrier and tightly wraps the battery sheet on the side circumferential surface of the welding carrier, the side circumferential surface of the welding carrier is rotated around the axis of the rotating shaft.

8. The method for double-sided welding of a solar cell according to claim 5, characterized in that: At least two bearing surfaces with wiring grooves are arranged on the side circumference of the welding carrier, and the axis of each bearing surface is parallel or colinear with the axis of the rotating shaft; The first strip-shaped conductive connection member is pre-placed by winding the first strip-shaped conductive connection member along the circumferential direction of the side surface of the welding carrier and tightening the side surface of the welding carrier; and the first strip-shaped conductive connection member is routed in each routing groove; Place the battery cells on each of the supporting surfaces, respectively, so that the surface of one side of the battery cell to be welded with the first strip-shaped conductive connector faces the corresponding supporting surface, and the inner side surface of the battery cell is attached to the first strip-shaped conductive connector; The second strip-shaped conductive connecting member is wound around the circumference of the side surface of the welding carrier and tightly wrapped around the battery cells on the side surface of the welding carrier, so that the second strip-shaped conductive connecting member is tightly attached to the outer surface of each battery cell; The first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member are heated to weld the first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member on each battery cell.

9. The double-sided welding method of a solar cell according to claim 8, characterized in that: A plurality of bearing surfaces with wiring grooves are arranged on the side circumference of the welding carrier, and the bearing surfaces are arranged in sequence along the circumference of the side circumference of the welding carrier.

10. The double-sided welding method of a solar cell according to claim 9, characterized in that: Make each bearing surface evenly distributed along the circumferential direction of the side surface of the welding carrier.

11. The method for double-sided welding of a solar cell according to claim 8, characterized in that: A plurality of rows of bearing surfaces with wiring grooves are arranged on the side circumference of the welding carrier, so that each row of bearing surfaces is arranged in sequence along the circumference of the side circumference of the welding carrier, and the bearing surfaces in the same row are arranged in sequence along the axial direction of the rotating shaft, and the axis of each bearing surface is parallel or colinear with the axis of the rotating shaft.

12. The method for double-sided welding of a solar cell according to claim 11, characterized in that: The multiple rows of bearing surfaces are evenly distributed along the circumferential direction of the side surface of the welding carrier.

13. The double-sided welding method of a solar cell according to claim 12, characterized in that: Make sure that each bearing surface is evenly distributed on the side circumference of the welding carrier.

14. The double-sided welding method of a solar cell according to claim 8, characterized in that: The side circumference of the welding carrier is surrounded by a plurality of bearing surfaces.

15. The double-sided welding method of a solar cell according to claim 14, characterized in that: Make the side surface of the welding carrier coaxial with the rotating shaft.

16. The method for double-sided welding of a solar cell according to claim 8, characterized in that: The side circumference of the welding carrier is made into a circumferential surface coaxial with the rotating shaft.

17. The method for double-sided welding of a solar cell according to claim 16, characterized in that: The wiring groove is an annular groove coaxial with the rotating shaft.

18. The method for double-sided welding of a solar cell according to claim 5, characterized in that: Only one first strip-shaped conductive connector is used to wrap around the wiring groove and tightly wrap around the side surface of the welding carrier; only one second strip-shaped conductive connector is used to wrap around the side surface of the welding carrier and tightly wrap around the battery cells on the side surface of the welding carrier.

19. The double-sided welding method of a solar cell according to claim 1, characterized in that: The first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member are made of welding wire or welding strip.

20. The double-sided welding method of a solar cell according to claim 1, characterized in that: The first strip-shaped conductive connector and the second strip-shaped conductive connector have a flat bottom surface for welding with the battery cell; when the first strip-shaped conductive connector is pre-set, the flat bottom surface of the first strip-shaped conductive connector is arranged opposite to the supporting surface; when the second strip-shaped conductive connector is stretched and fitted tightly on the outer side of the battery cell, the flat bottom surface of the second strip-shaped conductive connector faces the outer side surface of the battery cell.

21. The method for double-sided welding of a solar cell according to claim 20, characterized in that: The wiring groove is capable of supporting the first strip-shaped conductive connecting member for wiring therein so as to keep the flat bottom surface opposite to the bearing surface.

22. The double-sided welding method of a solar cell according to claim 21, characterized in that: The first strip-shaped conductive connector adopts a triangular welding strip; the wiring groove is a V-shaped groove; when the first strip-shaped conductive connector is routed in the wiring groove, the top corner of the first strip-shaped conductive connector is embedded in the wiring groove, and the bottom surface of the first strip-shaped conductive connector protrudes from the wiring groove.

23. The double-sided welding method of a solar cell according to claim 1, characterized in that: The first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member are heated by infrared heating or hot air heating.

24. The method for double-sided welding of a solar cell according to claim 23, characterized in that: The welding carrier is provided with a heating function, and the first strip-shaped conductive connecting member on the carrying surface, the battery cell and the second strip-shaped conductive connecting member on the outer surface of the battery cell are heated by the welding carrier.

25. The double-sided welding method of a solar cell according to claim 1, characterized in that: The carrying surface is provided with a vacuum adsorption function; when the battery cell is placed on the carrying surface, the battery cell is vacuum adsorbed.

26. The double-sided welding method of a solar cell according to claim 1, characterized in that: After the first strip-shaped conductive connector and the second strip-shaped conductive connector are welded to the battery cell, the first strip-shaped conductive connector and the second strip-shaped conductive connector are cut off to leave small segments of the first strip-shaped conductive connector and the second strip-shaped conductive connector on the battery cell, and the small segments of the first strip-shaped conductive connector and the second strip-shaped conductive connector are used for connecting the battery cells in series; then the battery cell is removed from the carrying surface of the welding carrier.

27. The double-sided welding method of a solar cell according to claim 1, characterized in that: The first strip-shaped conductive connecting member and the second strip-shaped conductive connecting member are heated by direct heating.

Images