CN111900224B - Welding method - Google Patents

Welding method Download PDF

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Publication number
CN111900224B
CN111900224B CN202010463625.7A CN202010463625A CN111900224B CN 111900224 B CN111900224 B CN 111900224B CN 202010463625 A CN202010463625 A CN 202010463625A CN 111900224 B CN111900224 B CN 111900224B
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China
Prior art keywords
string
protruding
contact solar
welding
battery
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CN202010463625.7A
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CN111900224A (en
Inventor
王勇
陈军
李华
刘继宇
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Taizhou Longi Solar Technology Co Ltd
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Taizhou Longi Solar Technology Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/05Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0516Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar cells
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/05Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0508Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/1876Particular processes or apparatus for batch treatment of the devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention provides a welding method, and relates to the technical field of solar photovoltaics. The welding method comprises the following steps: welding a first main grid of one back contact solar cell and a second main grid of an adjacent back contact solar cell by adopting a welding strip to obtain a cell string; the polarity of the first main grid is opposite to that of the second main grid; one surface of the welding strip is provided with at least one convex structure; in the battery string, the protruding direction of the protruding structure is perpendicular to the backlight surface of the back contact solar battery, and the protruding structure is far away from the backlight surface of the back contact solar battery; applying a first acting force from the solder strip to a light facing surface of the back contact solar cell on the convex structure of the solder strip in the cell string; and/or arranging the battery string on a raised working table, wherein the raised surface of the raised working table applies a second acting force to the battery string; the convex surface is in contact with the light facing surface of the back contact solar cell. The method and the device can offset all or part of welding stress, reduce warping, have low welding cost and are simple in process.

Description

Welding method
Technical Field
The invention relates to the technical field of solar photovoltaics, in particular to a welding method.
Background
The back contact solar cell has the advantages that the front side of the back contact solar cell is not provided with the main grid line, the positive electrode and the negative electrode are arranged on the back side of the cell, shading is reduced, short-circuit current of the cell is effectively increased, energy conversion efficiency is improved, the back contact solar cell is more attractive, and further the application prospect is wide.
Currently, solder ribbons are mainly used to conductively interconnect individual back contact solar cells. The inventor discovers in the process of researching the prior art as follows: since welding only occurs on the backlight surface of the battery, the warping is severe after welding.
Disclosure of Invention
The invention provides a welding method, and aims to solve the problem of serious welding warpage in back contact solar cell conductive interconnection.
In a first aspect of the present invention, there is provided a welding method comprising:
welding a first main grid of one back contact solar cell and a second main grid of an adjacent back contact solar cell by adopting a welding strip to obtain a cell string; the polarity of the first main grid is opposite to that of the second main grid; at least one protruding structure is arranged on one surface of the welding strip; in the battery string, the protruding direction of the protruding structure is perpendicular to the backlight surface of the back contact solar battery, and the protruding structure is far away from the backlight surface of the back contact solar battery;
applying a first force from the solder strip to a light-facing surface of the back contact solar cell on the raised structure of the solder strip in the string of cells;
and/or arranging the battery string on a raised working table, wherein the raised surface of the raised working table applies a second acting force to the battery string; the convex surface is in contact with the light facing surface of the back contact solar cell.
Optionally, the shape of the protruding structure is: one of circular arc, ellipse, V-shaped or rectangle; the height of the protruding structure is less than or equal to 0.5 mm.
Optionally, before applying the first force from the solder strip to the light-facing surface of the back-contact solar cell on the protruding structure of the solder strip in the battery string, the method further includes:
placing the string of cells on a platform such that the platform is in contact with a light-facing side of the back-contact solar cell in the string of cells;
the applying a first force from the solder strip to a light-facing surface of the back contact solar cell on the raised structure of the solder strip in the string of cells includes:
and applying a first acting force from the solder strip to the light facing surface of the back contact solar cell on the protruding structure of the solder strip in the cell string by adopting an elastic object.
Optionally, the pressure of the first acting force acting on the convex structure is 0.01-0.1 MPa.
Optionally, the platform has a preset temperature, and the preset temperature is: 50-170 ℃.
Optionally, before the battery string is disposed on the protruding workbench, and the protruding surface of the protruding workbench applies the second acting force to the battery string, the method further includes:
placing the battery string on a feeding transmission structure; the feeding transmission structure is provided with a vacuum adsorption hole, and the vacuum adsorption hole adsorbs the light facing surface of the back contact solar cell in the cell string; the feeding transmission structure is connected with the protruding workbench;
with the battery cluster sets up on protruding workstation, the protruding face of protruding workstation towards the second effort is applyed to the battery cluster, include:
the battery string is transmitted to the protruding workbench by the feeding transmission structure; the raised working table is provided with a vacuum adsorption hole;
the battery string is in the in-process of motion on the protruding workstation, the vacuum adsorption hole adsorbs the battery string, the protruding face of protruding workstation is to the second effort is applyed to the battery string.
Optionally, the raised surface of the raised working table has a preset temperature, which is: 50-170 ℃.
Optionally, the projection angle of the projection table is adjustable.
Optionally, the convex surface of the convex workbench is a flexible surface.
Optionally, when the back contact solar cell is a segmented cell, the whole non-segmented cell has a segment line on both sides of the segment line, and the polarities of the collinear main grids are opposite.
Optionally, the first main gate and/or the second main gate are/is composed of a pad and a thin gate line connecting adjacent pads; in the battery string, the projection of the protruding structure is not overlapped with the projection of the welding pad.
In the embodiment of the invention, the protruding structure on the welding strip can absorb part of welding stress to reduce warping, and the protruding structure can absorb deformation caused by the first acting force, the second acting force and the welding stress, so that the fragment rate can be reduced. Meanwhile, a first acting force from the solder strip to the light-facing surface of the back-contact solar cell is applied to the protruding structure of the solder strip in the cell string, and the direction of the first acting force is opposite to that of the welding stress, so that all or part of the welding stress can be counteracted, and the warping is reduced. And/or the battery string is arranged on the raised workbench, the raised surface of the raised workbench is at least partially contacted with the light-facing surface of the back-contact solar battery, namely the raised direction of the raised workbench is opposite to the welding warping direction, and the second acting force applied to the battery string by the raised workbench can offset all or part of the welding stress, so that the warping is reduced. According to the method, expensive materials such as conductive adhesive, tin paste and conductive adhesive film are not needed, the welding cost is low, the warping can be reduced by only applying the first acting force or the second acting force to the welded battery string, and the process is simple.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 illustrates a flow chart of the steps of a welding method in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first battery string in the embodiment of the present invention;
fig. 3 is a schematic structural view showing a second battery string in the embodiment of the invention;
FIG. 4 illustrates a schematic diagram of applying a first force in an embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of applying a second force in an embodiment of the invention;
fig. 6 is a schematic structural view showing a first monolithic battery in the embodiment of the invention;
fig. 7 shows a schematic structural view of a second monolithic battery in an embodiment of the invention;
fig. 8 is a schematic diagram showing a structure of a third battery string according to the embodiment of the present invention.
Description of the figure numbering:
1-solder strip, 11-bump structure, 2-back contact solar cell, 21-slicing line, 22-main grid, 23-pad, 24-fine grid line, 10-cell string, 3-bump workbench, 31-bump surface and 4-elastic object.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flow chart illustrating the steps of a welding method in an embodiment of the present invention. The welding method comprises the following steps:
step S1, welding a first main grid of a back contact solar cell and a second main grid of an adjacent back contact solar cell by adopting a welding strip to obtain a cell string; the polarity of the first main grid is opposite to that of the second main grid; at least one protruding structure is arranged on one surface of the welding strip; in the battery string, the protruding direction of the protruding structure is perpendicular to the backlight surface of the back contact solar battery, and the protruding structure is far away from the backlight surface of the back contact solar battery.
The backlight surface of the back contact solar cell is parallel to and alternately provided with a first main grid and a second main grid, and the polarities of the first main grid and the second main grid are opposite. For example, if the first main grid is a positive main grid, the second main grid is a negative main grid.
One surface of the solder strip is provided with at least one raised structure. The number of the projection structures is not particularly limited. And welding a first main grid of one back contact solar cell and a second main grid of an adjacent back contact solar cell by adopting the welding strip to obtain the cell string. The first main gate and the second main gate have opposite polarities. For example, the solder strip is used for welding the positive main grid of one back contact solar cell and the negative main grid of the adjacent back contact solar cell. Any one of infrared heating welding, electromagnetic welding and hot air welding can be adopted in the welding process, and the welding temperature can be 150-360 ℃. In the embodiment of the present invention, this is not particularly limited.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first battery string according to an embodiment of the present invention. Fig. 2 may be a top view of a battery string. In fig. 2, a solder ribbon 1 is soldered to a first main grid of a back contact solar cell 2 and to a second main grid of an adjacent back contact solar cell 2, the polarities of the first main grid and the second main grid being opposite.
In the battery string, the protruding direction of the protruding structure is perpendicular to the backlight surface of the back contact solar battery, and the protruding structure is far away from the backlight surface of the back contact solar battery. That is, the protruding direction of the protruding structure is a solder ribbon direction from the back light surface of the back contact solar cell. The protruding structure on the welding strip can absorb part of welding stress to reduce warping, and moreover, the protruding structure can absorb deformation caused by the first acting force, the second acting force and the welding stress, and the fragment rate can be reduced.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating a second battery string according to an embodiment of the present invention. Fig. 3 may be a front view of a battery string. In fig. 3, in the battery string, the protruding direction of the protruding structure 11 on the solder ribbon 1 is shown by an arrow of a straight line L1. The protruding direction of the protruding structure 11 is perpendicular to the backlight surface of the back contact solar cell 2, and the protruding structure 11 is far away from the backlight surface of the back contact solar cell 2.
Step S2, applying a first acting force from the solder strip to the light facing surface of the back contact solar cell on the convex structure of the solder strip in the cell string; and/or arranging the battery string on a raised working table, wherein the raised surface of the raised working table applies a second acting force to the battery string; the convex surface is in contact with the light facing surface of the back contact solar cell.
Specifically, step S2 is 2 post-welding processes for the battery string. A first force from the solder strip to a light-facing surface of the back-contact solar cell may be applied to the raised structure of the solder strip in the string of cells; the direction of the first acting force is opposite to the direction of the welding stress, and all or part of the welding stress can be counteracted, so that the warping is reduced.
As shown with reference to fig. 4, fig. 4 illustrates a schematic diagram of applying a first force in an embodiment of the present invention. Fig. 4 may be a front view. In fig. 4, the direction of the first force exerted on the raised structures 11 of the solder ribbon 1 in the string is as indicated by the arrow of line L2, from the solder ribbon 1 towards the light-facing side of the back-contact solar cell 2. The direction of the welding stress is opposite to that of the first acting force, so that all or part of the welding stress can be counteracted, the release of the welding stress is accelerated, and the warping is reduced.
And/or the battery string is arranged on the raised workbench, the raised surface of the raised workbench is in contact with the light-facing surface of the back-contact solar battery, the raised surface of the raised workbench applies a second acting force to the battery string, namely the raised direction of the raised workbench is opposite to the welding warping direction, and the second acting force applied to the battery string by the raised workbench can offset all or part of welding stress, so that warping is reduced.
As shown with reference to fig. 5, fig. 5 illustrates a schematic diagram of applying a second force in an embodiment of the present invention. Fig. 5 may be a front view. In fig. 5, the cell string 10 is set on the convex stage 3, the convex surface 31 of the convex stage 3 is in contact with the light-facing surface of the back-contact solar cell, and the convex surface 31 of the convex stage 3 applies the second acting force to the cell string. In fig. 5, the warping direction of the battery string 10 is shown by an arrow of a straight line L3, the protruding direction of the protruding table 3 is shown by an arrow of a straight line L4, the protruding direction of the protruding table 3 is opposite to the welding warping direction, and the second force applied by the protruding table to the battery string can counteract all or part of the welding stress, thereby reducing the warping. For example, before the cell string 10 is set on the projection table 3, as shown by the arrow of the straight line L3, the warping direction of the cell string 10 is shown by the left side of the projection table 3, and after the cell string 10 is set on the projection table 3 so that the projection surface 31 of the projection table 3 is in contact with the light-facing surface of the back-contact solar cell and the second force is applied to the cell string 10 by the projection surface of the projection table 3, as shown by the right side of the projection table 3, the cell string 10 is substantially not warped and assumes a flat state.
It should be noted that the two post-welding processes may be performed alternatively, or both may be performed. For example, a first force is applied from the solder ribbon to the light-facing side of the back-contact solar cell only on the raised structures of the solder ribbon in the string. Or after the first acting force is applied to the protruding structure, the battery string is arranged on the protruding workbench, the protruding surface of the protruding workbench is in contact with the light facing surface of the back contact solar battery, and the protruding surface of the protruding workbench applies a second acting force to the battery string.
According to the method, expensive materials such as conductive adhesive, tin paste and conductive adhesive film are not needed, the welding cost is low, the warping can be reduced by only applying the first acting force or the second acting force to the welded battery string, and the process is simple.
Optionally, the shape of the protruding structure on the solder strip may be: one of circular arc, ellipse, V-shaped or rectangle. The height of the protruding structure is less than or equal to 0.5 mm. The convex structure in the shape can absorb part of welding stress to a greater extent so as to reduce warping, and moreover, the convex structure can absorb deformation caused by the first acting force, the second acting force and the welding stress to a greater extent so as to reduce the fragment rate.
As shown in fig. 3, the shape of the projection structure 11 is a circular arc. The height d of the convex structure 11 is less than or equal to 0.5 mm.
Optionally, before the first acting force is applied, the battery string may be placed on the platform, so that the platform is in contact with the light-facing surface of the back-contact solar battery in the battery string, that is, the protruding structures of the solder ribbons in the battery string are upward, thereby facilitating the operation.
Optionally, in step S2, applying a first force from the solder ribbon to the light-facing surface of the back-contact solar cell on the protruding structure of the solder ribbon in the cell string includes: the elastic object is adopted, a first acting force from the solder strip to the light-facing surface of the back contact solar cell is applied to the protruding structure of the solder strip in the cell string, the elastic object is adopted to apply the first acting force, and in the process of applying the first acting force, the elastic object has certain elastic deformation and can play a certain buffering role so as to avoid adverse effects caused by the first acting force. As shown with reference to fig. 4, the first force is applied using the elastic object 4. Alternatively, the portion of the elastic object 4 in contact with the raised structure 11 may have a certain elasticity.
Optionally, the pressure of the first acting force acting on the protruding structure is 0.01-0.1MPa, and the pressure range not only can quickly offset the welding stress to a greater extent, but also can not bring adverse effects to the battery string.
Optionally, the platform on which the battery string is placed may have a preset temperature of 50-170 ℃ to facilitate the release of welding stress without introducing adverse thermal effects to the battery string. In particular, a heating device may be arranged below the platform. In the embodiment of the present invention, this is not particularly limited.
Optionally, in step S2, before the battery string is placed on the protruding table, and the protrusion of the protruding table applies the second acting force to the battery string, the welding method further includes: placing the battery string on a feeding transmission structure; the feeding transmission structure is provided with a vacuum adsorption hole which adsorbs the light facing surface of the back contact solar cell in the cell string. Namely, the light-facing surface of the back contact solar cell is tightly attached to the feeding transmission structure, and the solder strip in the cell string is far away from the feeding transmission structure. The vacuum adsorption hole has adsorption force opposite to welding stress on the battery string, and can also partially offset the welding stress so as to reduce warping. The feeding transmission structure is connected with the protruding workbench. As shown in fig. 5, the battery string 10 is provided on the left side of the projection table 3, and the battery string 10 may be provided on the feeding transport structure. The feeding transmission structure can be a transmission belt and the like. Set up the battery cluster on protruding workstation, the protruding second effort of exerting towards the battery cluster of protruding workstation includes: the battery string is transmitted to the protruding workbench by the feeding transmission structure; furthermore, the light facing surface of the back contact solar cell can be tightly attached to the convex surface of the convex workbench, the solder strip in the cell string is far away from the convex surface of the convex workbench, and the convex workbench is provided with a vacuum adsorption hole; in the process that the battery string moves on the convex workbench, the vacuum adsorption hole adsorbs the battery string, the vacuum adsorption hole has adsorption force opposite to welding stress on the battery string, and the welding stress can be partially offset to reduce warping. The second acting force is applied to the battery string by the convex surface of the convex workbench, the convex direction of the convex workbench is opposite to the welding warping direction, and the second acting force applied to the battery string by the convex workbench can offset all or part of welding stress, so that warping is reduced.
Optionally, the raised surface of the raised working table has a preset temperature, which is: 50-170 ℃ to facilitate the release of welding stress and not bring adverse thermal influence to the battery string. Specifically, a heating device may be provided below the projection surface of the projection table. In the embodiment of the present invention, this is not particularly limited.
Optionally, after applying the second force, the projection table may be connected to a blanking transfer structure, and the method may further include: and transmitting the battery string to a blanking transmission structure, so that the welding stress of the subsequent battery string can be released uninterruptedly. As shown in fig. 5, the battery string 10 is located at the right side of the projection table 3, and the battery string 10 may be disposed on the blanking conveying structure. The blanking transmission structure can be a transmission belt and the like.
Optionally, the protruding angle of the protruding workbench is adjustable, so that the battery string can adapt to different welding stresses. The protruding angle of the protruding table may be a fan-shaped angle corresponding to the protruding surface of the protruding table. The adjustment range of the protrusion angle is generally determined according to the soldering stress and the warping degree of the cell string, the size of the back contact solar cell, and the like, and is not particularly limited in the embodiment of the present invention.
Specifically, the method comprises the following steps: the projection angle or curvature of the projection table may be determined by the maximum projection height of the projection table, the width of the projection table, and the like. In the protrusion direction of the protrusion table, the maximum protrusion height of the protrusion table may be equal to the maximum warping distance of the back contact solar cell in the cell string to be adjusted. As shown in fig. 5, the projection direction of the projection table is parallel to the direction shown by L4, and the maximum projection height d of the projection table is equal to the maximum warping distance of the back contact solar cell in the cell string to be adjusted. In a direction perpendicular to the protrusion direction of the protrusion table, the width of the protrusion table may be greater than or equal to the length of 1 back contact solar cell in the string of cells to be adjusted.
For example, for a cell string formed by half cells corresponding to 156.75mm × 156.75mm cells, if the width of the projection table is equal to the sum of the lengths of the 2 half cells in the direction perpendicular to the projection direction of the projection table, and if the maximum projection height of the projection table is equal to the maximum warping distance of 1 half cell in the cell string, the radius corresponding to the projection surface of the projection table determined by this is 130mm, the angle corresponding to the projection surface of the projection table may be 68 °.
Optionally, the convex surface of the convex workbench is a flexible surface, and in the process of applying the second action, the flexible surface can play a certain buffering role by deforming so as to avoid adverse effects caused by the second action force. This may be achieved by laying a flexible material or a coating of a flexible material on the convex surface, which is not particularly limited in the embodiment of the present invention.
Optionally, under the condition that the back contact solar cell is a split cell, the split line is arranged in the whole split cell which is not split, the split line is positioned on two sides of the split line, the polarities of the collinear main grids are opposite, and after the whole split cell is split along the split line, the split cell does not need to be rotated by 180 degrees, only the first main grid of one split cell of the adjacent split cell and the collinear second main grid of the adjacent split cell are connected by using the same welding strip to realize series connection. Moreover, the battery string or the battery string assembly is more beautiful. As shown in fig. 6, fig. 6 is a schematic structural view of a first monolithic battery in an embodiment of the present invention. Fig. 6 may be a top view. In fig. 6, the whole cell has 1 dividing line 21, and two half cells are obtained after the whole cell is divided along the dividing line 21. In fig. 6, the polarities of the collinear main grids on both sides of the segment line 21 are opposite, for example, if the first main grid 22 on the left side of the segment line 21 is a positive main grid from top to bottom, the first main grid 22 on the right side of the segment line 21 is collinear with the first main grid 22 on the left side from top to bottom, and the first main grid 22 on the right side of the segment line 21 is a negative main grid from top to bottom. By analogy, from top to bottom, the last main grid 22 on the left side of the slicing line 21 is collinear with the last main grid 22 on the right side of the slicing line 21, and the polarities are opposite. Then, after the half cells are sliced along the slicing line 21, the half cells do not need to be rotated by 180 degrees, and the series connection can be realized only by connecting the first main grid of one half cell of the adjacent half cells with the collinear second main grid of the adjacent half cells by using the same welding strip.
For another example, referring to fig. 7, fig. 7 shows a schematic structural diagram of a second monolithic battery in an embodiment of the present invention. Fig. 7 may be a top view. In fig. 7, the whole battery has 2 slicing lines 21, and 3 sliced batteries are obtained after slicing the whole battery along the 2 slicing lines 21. On either side of each segment line 21 in fig. 7, the collinear main gates are of opposite polarity. For example, if the first main grid 22 on the left side of the leftmost dividing line 21 is a positive main grid from top to bottom, the first main grid 22 in the middle of the two dividing lines 21 is collinear with the first main grid 22 on the left side from top to bottom, and the first main grid 22 in the middle of the two dividing lines 21 is a negative main grid from top to bottom. From top to bottom, the first main grid 22 on the right side of the rightmost slicing line 21 is collinear with the first main grid 22 from top to bottom in the middle of the two slicing lines 21, and from top to bottom, the first main grid 22 on the right side of the rightmost slicing line 21 is a positive main grid. And so on. After the half-cell is sliced along the slicing line 21, the half-cell does not need to be rotated by 180 degrees, and the series connection can be realized only by connecting the first main grid of one of the sliced cells of the adjacent half-cell with the collinear second main grid of the adjacent sliced cell by using the same welding strip. Referring to fig. 8, fig. 8 is a schematic structural diagram of a third battery string according to an embodiment of the present invention. Fig. 8 may be a top view. In fig. 8, from top to bottom, from left to right, the first solder strip may be directly connected to the first main grid 22 on the left side of the slicing line 21 in fig. 7, from top to bottom, and connected to the first main grid 22 in the middle of the two slicing lines 21, from top to bottom, without rotating 180 °.
It should be noted that the method according to the embodiment of the present invention is also applicable to the above-mentioned split cell in which the back contact solar cell is a whole cell without splitting, and the split cells have split lines on both sides of the split lines, and the collinear main gates have the same polarity. But after the whole battery is sliced along the slicing line, the slicing battery needs to be rotated by 180 degrees.
The size of each divided battery is substantially the same for each divided battery. Through carrying out the burst to whole piece battery, the area of burst battery is less, can reduce the warpage after the welding in the battery cluster. However, when the whole battery is divided into pieces, there are many cutting damages, which may adversely affect the battery performance, and therefore, it is necessary to determine whether or not the whole battery is divided into pieces or divided into several pieces after a comprehensive balance is made.
Alternatively, as shown in fig. 2, the first and/or second main gate is composed of a pad 23 and a thin gate line 24 connecting adjacent pads 23. In the battery string, the solder strip may connect the pad of the first main gate and the pad of the second main gate. The width of the fine grid line 24 can be smaller than or equal to the width of the pad 23, and in the battery string, the projection of the protruding structure 11 is not overlapped with the projection of the pad 23, namely, the protruding structure is arranged between the two pads, so that the welding reliability can be ensured. The shape of the pad may be any suitable shape, such as a circle, a rectangle, or an ellipse, which is not particularly limited in the embodiment of the present invention.
In the embodiment of the invention, the protruding structure on the welding strip can absorb part of welding stress to reduce warping, and the protruding structure can absorb deformation caused by the first acting force, the second acting force and the welding stress, so that the fragment rate can be reduced. Meanwhile, a first acting force from the solder strip to the light-facing surface of the back-contact solar cell is applied to the protruding structure of the solder strip in the cell string, and the direction of the first acting force is opposite to that of the welding stress, so that all or part of the welding stress can be counteracted, and the warping is reduced. And/or the battery string is arranged on the raised workbench, the raised surface of the raised workbench is at least partially contacted with the light-facing surface of the back-contact solar battery, namely the raised direction of the raised workbench is opposite to the welding warping direction, and the second acting force applied to the battery string by the raised workbench can offset all or part of the welding stress, so that the warping is reduced. According to the method, expensive materials such as conductive adhesive, tin paste and conductive adhesive film are not needed, the welding cost is low, the warping can be reduced by only applying the first acting force or the second acting force to the welded battery string, and the process is simple.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the embodiments of the application.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. A method of welding, the method comprising:
welding a first main grid of one back contact solar cell and a second main grid of an adjacent back contact solar cell by adopting a welding strip to obtain a cell string; the polarity of the first main grid is opposite to that of the second main grid; at least one protruding structure is arranged on one surface of the welding strip; in the battery string, the protruding direction of the protruding structure is perpendicular to the backlight surface of the back contact solar battery, and the protruding structure is far away from the backlight surface of the back contact solar battery;
applying a first force from the solder strip to a light-facing surface of the back contact solar cell on the raised structure of the solder strip in the string of cells;
and/or arranging the battery string on a raised working table, wherein the raised surface of the raised working table applies a second acting force to the battery string; the convex surface is in contact with the light facing surface of the back contact solar cell.
2. The welding method of claim 1, wherein the shape of the raised structure is: one of circular arc, ellipse, V-shaped or rectangle; the height of the protruding structure is less than or equal to 0.5 mm.
3. The soldering method according to claim 1 or 2, wherein before the applying the first force from the solder ribbon to the light-facing surface of the back contact solar cell on the convex structure of the solder ribbon in the cell string, further comprises:
placing the string of cells on a platform such that the platform is in contact with a light-facing side of the back-contact solar cell in the string of cells;
the applying a first force from the solder strip to a light-facing surface of the back contact solar cell on the raised structure of the solder strip in the string of cells includes:
and applying a first acting force from the solder strip to the light facing surface of the back contact solar cell on the protruding structure of the solder strip in the cell string by adopting an elastic object.
4. Welding method according to claim 1 or 2, wherein the pressure of the first force on the protruding structure is 0.01-0.1 MPa.
5. The welding method of claim 3, wherein the platform has a preset temperature that is: 50-170 ℃.
6. The welding method according to claim 1 or 2, wherein the step of placing the battery string on a projection table, before the projection of the projection table applies the second force to the battery string, further comprises:
placing the battery string on a feeding transmission structure; the feeding transmission structure is provided with a vacuum adsorption hole, and the vacuum adsorption hole adsorbs the light facing surface of the back contact solar cell in the cell string; the feeding transmission structure is connected with the protruding workbench;
with the battery cluster sets up on protruding workstation, the protruding face of protruding workstation towards the second effort is applyed to the battery cluster, include:
the battery string is transmitted to the protruding workbench by the feeding transmission structure; the raised working table is provided with a vacuum adsorption hole;
the battery string is in the in-process of motion on the protruding workstation, the vacuum adsorption hole adsorbs the battery string, the protruding face of protruding workstation is to the second effort is applyed to the battery string.
7. Welding method according to claim 1 or 2, wherein the projection face of the projection table has a preset temperature: 50-170 ℃.
8. The welding method of claim 1, wherein a projection angle of the projection table is adjustable.
9. The welding method of claim 1, wherein the raised surface of the raised table is a flexible surface.
10. The soldering method according to claim 1 or 2, wherein, in the case that the back contact solar cell is a segmented cell, the whole non-segmented cell has segmentation lines on both sides of the segmentation lines, and the polarities of the collinear main grids are opposite.
11. The soldering method according to claim 1 or 2, wherein the first main grid and/or the second main grid is composed of a pad and a thin grid line connecting adjacent pads; in the battery string, the projection of the protruding structure is not overlapped with the projection of the welding pad.
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CN203277454U (en) * 2013-04-27 2013-11-06 比亚迪股份有限公司 Welding tape used for solar cell, and solar cell assembly
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