Solar cell module and production method and production equipment thereof

Abstract

The present application discloses a solar cell assembly and a production method and production equipment thereof, the method comprising: pulling a welding strip and cutting to form a group of welding strips; performing a first special-shaped processing on the head end of the group of welding strips so that the head ends of two adjacent welding strips in the group of welding strips overlap; laying the front half of the group of welding strips after the first special-shaped processing on the front main grid line of the i-th cell; performing a second special-shaped processing on the tail end of the group of welding strips so that the tail ends of two adjacent welding strips in the group of welding strips overlap; conveying the i-th cell and the group of welding strips, laying the i+1th cell to the rear half of the group of welding strips after the second special-shaped processing, iterating the laying of the cell and welding strips; welding the laid predetermined number of cell and welding strips. The present application can prevent the displacement of the head and tail of the welding strip, increase the welding strength of the welding strip, better fix the position of the welding strip on the cell, enhance the welding reliability, and thus reduce the situation of false welding and desoldering.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic component production, and relates to a solar cell component and a production method and production equipment thereof. Background Art

[0002] In order to reduce the cost of silver paste, the silver paste points on the main grid of the battery cell are now more and more dispersed. When the battery cells are connected in series through the welding ribbon, it is easy to have loose welding and the welding ribbon is easy to loosen, resulting in cold welding and desoldering.

[0003] How to improve the welding stability between the soldering ribbon and the battery cell is a technical problem that needs to be solved at present. Summary of the invention

[0004] In order to solve the problems in the related art, the present application provides a solar cell module and a production method and production equipment thereof, and the technical solution is as follows:

[0005] In a first aspect, the present application provides a solar cell assembly, the solar cell assembly comprising a predetermined number of cells and at least one group of welding strips for connecting two adjacent cells in series, each group of welding strips comprising n welding strips laid in sequence and in parallel, wherein:

[0006] The front half of each group of welding strips is laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding strips is laid below the back main grid line of the rear battery cell between the two adjacent battery cells. The leading end and the tail end of each group of welding strips form a special-shaped structure, so that the leading ends of two adjacent welding strips overlap and the tail ends of two adjacent welding strips overlap.

[0007] By setting the two ends of the welding strip as special-shaped structures, the head ends of the welding strips in the same group are overlapped with each other, and the tail ends of the welding strips in the same group are overlapped with each other, so that the ends of the welding strips are supported and fixed by the special-shaped structures, which can prevent the head and tail ends of the welding strip from being displaced, increase the welding strength of the welding strip, better fix the position of the welding strip on the battery cell, enhance the welding reliability, and thus reduce the situation of cold soldering and desoldering.

[0008] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0009] Optionally, the head ends and tail ends of the second to nth welding strips in each group of welding strips are bent toward the direction of the first welding strip.

[0010] Optionally, the head end and the tail end of each welding strip located on both sides of the i-th welding strip in each group of welding strips are bent toward the direction of the i-th welding strip.

[0011] Optionally, the leading end of the first welding strip in each group of welding strips is bent toward the leading end of the second welding strip, the trailing end of the nth welding strip in the same group of welding strips is bent toward the trailing end of the (n-1)th welding strip, the leading ends of the remaining welding strips in the same group of welding strips are all bent toward the leading end of the nth welding strip, and the trailing ends of the remaining welding strips are all bent toward the trailing end of the first welding strip.

[0012] Optionally, the length of the special-shaped structure at the end of each welding strip is the same as the spacing between the welding strip and the adjacent welding strips overlapped by the special-shaped structure. This ensures that the special-shaped structure can overlap the adjacent welding strips, thereby better ensuring support for the ends of the welding strips.

[0013] Optionally, the lengths of the non-special-shaped structural portions of each welding strip in the same group of welding strips are the same.

[0014] Optionally, spaced silver paste dots are formed on both the front main grid lines and the back main grid lines of the cell; or,

[0015] Silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the back side of the cell; or,

[0016] The leading end of the odd-numbered busbars on the front of the cell is formed with a silver paste dot, the trailing end of the even-numbered busbars on the front of the cell is formed with a silver paste dot, the trailing end of the odd-numbered busbars on the back of the cell is formed with a silver paste dot, and the leading end of the even-numbered busbars on the back of the cell is formed with a silver paste dot; or,

[0017] Silver paste dots are formed at the tail ends of the odd-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the even-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the odd-numbered main grid lines on the back side of the battery cell, and silver paste dots are formed at the tail ends of the even-numbered main grid lines on the back side of the battery cell.

[0018] Optionally, the middle of each welding strip is flattened, and two adjacent battery cells are stacked at adjacent edges; or,

[0019] The middle of each welding strip is bent, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance; or,

[0020] Each welding ribbon is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0021] Optionally, the battery cell is a whole battery cell or a battery slice formed by slicing a whole battery cell.

[0022] In a second aspect, the present application also provides a method for producing a solar cell module, the method comprising:

[0023] Pulling the welding strip and cutting it to form an i-th group of welding strips, wherein the i-th group of welding strips includes n welding strips;

[0024] Performing a first profiling process on the head end of the i-th group of welding strips so that the head ends of two adjacent welding strips in the i-th group of welding strips overlap;

[0025] Laying the front half of the i-th group of welding ribbons after the first special-shaped processing on the front main grid line of the i-th solar cell;

[0026] Performing a second special-shaped processing on the tail end of the i-th group of welding strips so that the tail ends of two adjacent welding strips in the i-th group of welding strips overlap;

[0027] Synchronously conveying the i-th cell and the i-th group of welding ribbons forward, laying the i+1-th cell on the rear half of the i-th group of welding ribbons after the second profiling process, and continuing to perform the steps of pulling the welding ribbons and cutting to form the i+1-th group of welding ribbons until a predetermined number of cells are laid;

[0028] The predetermined number of cells and welding ribbons laid out are welded.

[0029] By subjecting the ends of the same group of welding strips to special-shaped processing, special-shaped structures that can overlap each other at the ends of the welding strips are formed, that is, the head ends of the same group of welding strips overlap each other, and the tail ends of the same group of welding strips overlap each other, so that the ends of the welding strips are supported and fixed by the special-shaped structure, which can prevent the head and tail ends of the welding strip from being displaced, increase the welding strength of the welding strip, better fix the position of the welding strip on the battery cell, enhance the welding reliability, and thus reduce the situation of cold soldering and desoldering.

[0030] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0031] Optionally, the pulling the welding strips and cutting to form the i-th group of welding strips comprises:

[0032] Using a dislocated cutter to cut the pulled welding strip, the length of the first welding strip in the i-th group of welding strips formed by cutting is shorter than the lengths of the second to n-th welding strips in the same group, and the centers of the welding strips in the i-th group of welding strips are all located on the same straight line;

[0033] The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises:

[0034] The head ends of the nth to the second welding strips are sequentially bent vertically toward the direction of the first welding strip, so that the head ends of the second to the nth welding strips all form head end special-shaped structures;

[0035] The second profiling of the tail end of the i-th group of welding strips comprises:

[0036] The tail ends of the nth to second welding strips are bent vertically in the direction of the first welding strip in sequence, so that the tail ends of the second to nth welding strips all form tail end special-shaped structures;

[0037] The lengths of the non-special-shaped structural parts of the second to nth welding strips are the same as the length of the first welding strip.

[0038] Optionally, the pulling the welding strips and cutting to form the i-th group of welding strips comprises:

[0039] The pulled welding strip is cut by using a dislocated cutter, so that the length of the jth welding strip in the i-th group of welding strips formed by cutting is shorter than the lengths of the first to n-th welding strips in the same group except the j-th welding strip, and the centers of the welding strips in the i-th group of welding strips are all located on the same extension line, 1<j<n;

[0040] The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises:

[0041] The head ends of the welding strips on both sides of the j-th welding strip are bent vertically in the direction of the j-th welding strip in sequence, so that the head ends of the welding strips on both sides of the j-th welding strip form head end special-shaped structures;

[0042] The second profiling of the tail end of the i-th group of welding strips comprises:

[0043] The tail ends of each welding strip on both sides of the j-th welding strip are bent vertically in the direction of the j-th welding strip in sequence, so that the tail ends of each welding strip on both sides of the j-th welding strip form tail end special-shaped structures;

[0044] The length of the non-special-shaped structure portion of each welding strip on both sides of the j-th welding strip is the same as the length of the j-th welding strip.

[0045] Optionally, the pulling the welding strips and cutting to form the i-th group of welding strips comprises:

[0046] The pulled welding strip is cut by using a dislocation cutter, so that the length of the first welding strip in the i-th group of welding strips formed by cutting is the same as the length of the n-th welding strip, and both are shorter than the lengths of the middle welding strips in the same group, the head end of the first welding strip is aligned with the head ends of the middle welding strips, and the tail end of the n-th welding strip is aligned with the tail ends of the middle welding strips;

[0047] The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises:

[0048] The head ends of the first to (n-1)th welding strips are bent vertically in the direction of the nth welding strip in sequence, and the head ends of the first to (n-1)th welding strips are all formed into head end special-shaped structures;

[0049] The second profiling of the tail end of the i-th group of welding strips comprises:

[0050] The tail ends of the nth to second welding strips are bent vertically toward the direction of the first welding strip in sequence, and the tail ends of the nth to second welding strips all form tail end special-shaped structures;

[0051] The lengths of the non-special-shaped structural parts of each welding strip are the same.

[0052] Optionally, after performing the first profiling process on the head end of the i-th group of welding ribbons, the solar cell module production method further comprises:

[0053] Detecting the head end of the i-th group of welding strips after the first profiling process;

[0054] When the special-shaped structure at the head end of the i-th group of welding strips does not meet the predetermined bending angle, the special-shaped structure at the head end of the i-th group of welding strips is bent again;

[0055] After performing a second profiling process on the tail end of the i-th group of welding ribbons, the solar cell module production method further includes:

[0056] Detecting the tail end of the i-th group of welding ribbons after the second profiling process;

[0057] When the special-shaped structure of the tail end of the i-th group of welding strips does not meet the predetermined bending angle, the special-shaped structure of the tail end of the i-th group of welding strips is bent again.

[0058] After the first and second special-shaped processing, the special-shaped structures formed after the special-shaped processing are inspected. When the special-shaped structure does not meet the predetermined bending angle, the special-shaped structure is bent again to ensure that the special-shaped structure at the end of the welding strip meets the requirements, so as to improve the lap support and ensure the uniformity of the support force at the end of the welding strip.

[0059] In a third aspect, the present application further provides a solar cell module production device, the solar cell module production device comprising a solder strip feeding device, a solder strip pulling device, a solder strip cutting device, a solder strip bending device, a cell feeding device, a conveying device and a welding device, wherein:

[0060] The welding ribbon feeding device provides welding ribbon;

[0061] The welding ribbon pulling device pulls the welding ribbon out from the welding ribbon feeding device, and the pulled welding ribbon passes through the welding ribbon cutting device and the welding ribbon bending device in sequence;

[0062] The welding ribbon cutting device cuts the welding ribbon pulled out by the welding ribbon pulling device;

[0063] The welding strip bending device bends the head end and the tail end of the cut welding strip, so that the head end and the tail end of each group of welding strips form a special-shaped structure, so that the head ends of two adjacent welding strips overlap and the tail ends of two adjacent welding strips overlap;

[0064] The cell feeding device cooperates with the welding tape pulling device to stack the cells and the bent welding tapes on the conveying device, so that the front half of each group of welding tapes is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each group of welding tapes is laid below the rear main grid line of the rear cell of the two adjacent cells;

[0065] The conveying device conveys the stacked battery cells and welding ribbons to the welding device for welding.

[0066] By setting up a welding strip bending device, the two ends of the welding strip are bent to form a special-shaped structure, so that the head ends of the welding strips in the same group overlap each other, and the tail ends of the welding strips in the same group overlap each other, so that the ends of the welding strips are supported and fixed by the special-shaped structure, which can prevent the head and tail ends of the welding strip from being displaced, increase the welding strength of the welding strip, better fix the position of the welding strip on the battery cell, enhance the welding reliability, and thus reduce the situation of false soldering and desoldering.

[0067] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0068] Optionally, the welding strip cutting device includes a first set of blades and a second set of blades and a third set of blades connected to the first set of blades, and the distance between the second set of blades and the first set of blades, and the distance between the third set of blades and the first set of blades are both equal to the length of the special-shaped structure at the end of the welding strip;

[0069] The second set of blades and the third set of blades are symmetrically arranged on both sides of one end of the first set of blades; or,

[0070] The second set of blades and the third set of blades are respectively arranged at two ends of the first set of blades and located on both sides of the first set of blades; or,

[0071] The second group of blades and the third group of blades are symmetrically arranged at the middle position of the first group of blades.

[0072] Optionally, the solar cell module production equipment further comprises a solder strip flattening device, which is located at a front station of the solder strip cutting device and performs a flattening process on the solder strip passing through.

[0073] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0075] Figure 1 is a schematic diagram of a solar cell assembly provided in one embodiment of the present application;

[0076] Figure 2A It is a schematic diagram of a group of special-shaped structures at the head end and tail end of a welding strip provided in one embodiment of the present application;

[0077] Figure 2B is a schematic diagram of a group of special-shaped structures at the head end and tail end of a welding strip provided in another embodiment of the present application;

[0078] Figure 2C is a schematic diagram of a group of special-shaped structures at the head end and tail end of a welding strip provided in another embodiment of the present application;

[0079] Figure 3A is a schematic diagram of the arrangement of silver paste dots on a battery cell provided in one embodiment of the present application;

[0080] Figure 3B is a schematic diagram of the arrangement of silver paste dots on a battery cell provided in another embodiment of the present application;

[0081] Figure 3C is a schematic diagram of the arrangement of silver paste dots on a battery cell provided in yet another embodiment of the present application;

[0082] Figure 4 is a flow chart of a method for producing a solar cell module provided in one embodiment of the present application;

[0083] Figure 5A is a schematic diagram of the structure of a solar cell module production device provided in one embodiment of the present application;

[0084] Figure 5B A schematic diagram of a solar cell module production device provided in one embodiment of the present application when stacking welding ribbons and solar cells;

[0085] Fig. 6A is a schematic diagram of a welding ribbon cutting device provided in one embodiment of the present application;

[0086] Figure 6B is a schematic diagram of a welding ribbon cutting device provided in another embodiment of the present application;

[0087] Figure 6C is a schematic diagram of a welding ribbon cutting device provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0088] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0089] Figure 1 is a schematic diagram of a solar cell assembly provided in one embodiment of the present application. In order to reduce the visual impact of overlap, Figure 1 Only two cells are shown in series. The solar cell assembly provided by the present application comprises a predetermined number of cells and at least one set of welding strips for connecting two adjacent cells in series, each set of welding strips comprises n welding strips laid in parallel in sequence, wherein:

[0090] The front half of each group of welding strips is laid on the front main grid line of the front battery cell 11 between the two adjacent battery cells, and the rear half of each group of welding strips is laid below the back main grid line of the rear battery cell 12 between the two adjacent battery cells. The leading end and the tail end of each group of welding strips form a special-shaped structure, so that the leading ends of the two adjacent welding strips are overlapped and the tail ends of the two adjacent welding strips are overlapped. Figure 1 The head end of the group of welding strips 20 forms a special-shaped structure 21, and the tail end forms a special-shaped structure 22.

[0091] Usually, the number of welding strips in each group is the same, for example, the number of welding strips in each group can be 3, 4, 5, 6, 9, 12, 15, 16, etc. The number of welding strips in each group is the same as the number of single-sided main grid lines on the battery cell. The number of welding strips in each group is not limited in this application. In principle, battery cells with different numbers of main grids can all use the idea of ​​the special-shaped structure of the welding strip end in this application to achieve series connection.

[0092] In order to achieve the overlap of the special-shaped structures at the head and tail ends of the welding strips, the present application provides at least three methods. Take each group of welding strips including 5 welding strips as an example, that is, take the value of n of each group of welding strips as 5 as an example, please combine them respectively. Figure 2A-2C shown.

[0093] exist Figure 2A In the figure, the dotted line with an arrow represents the bending direction, and the head and tail ends of the second to nth welding strips in each group of welding strips are bent toward the direction of the first welding strip, that is, except for the first welding strip, the two ends of the remaining welding strips are bent toward the direction of the first welding strip. Generally speaking, the bending here is a bending angle of 90°, or a bending angle of approximately 90°, and the bending angles of the ends of the welding strips in each embodiment of the present application are also defined similarly.

[0094] exist Figure 2B In the figure, the dotted line with an arrow represents the bending direction, and the head end and the tail end of each welding strip located on both sides of the i-th welding strip in each group of welding strips are bent toward the direction of the i-th welding strip.

[0095] The i-th welding strip here can be any welding strip located between the 1st and the nth welding strips. For example, when n is an odd number, the value of i is (n+1) / 2; when n is an even number, the value of i is n / 2, or n / 2+1.

[0096] exist Figure 2C In the figure, the dotted line with an arrow represents the bending direction, the head end of the first welding strip in each group of welding strips is bent toward the head end of the second welding strip, the tail end of the nth welding strip in the same group of welding strips is bent toward the tail end of the (n-1)th welding strip, the head ends of the remaining welding strips in the same group of welding strips are all bent toward the head end of the nth welding strip, and the tail ends of the remaining welding strips are all bent toward the tail end of the first welding strip.

[0097] In a possible implementation, the length of the special-shaped structure at the end of each welding strip is the same as the spacing between the welding strip and the adjacent welding strips overlapped by the special-shaped structure. This ensures that the special-shaped structure can overlap the adjacent welding strips, thereby better ensuring support for the ends of the welding strips.

[0098] Generally speaking, when the spacing between the main grid lines on the battery cells is the same, the length of the special-shaped structure of each welding strip in the same group of welding strips is also the same.

[0099] Optionally, the lengths of the non-special-shaped structural portions of each welding strip in the same group of welding strips are the same.

[0100] The silver paste dots on the cells in the solar cell module provided in this application are specially designed. Figure 3A-3C .

[0101] exist Figure 3A In the embodiment, the front and back main grid lines of the cell are both formed with spaced silver paste dots, and the spacing between these spaced silver paste dots can be the same or different. Figure 3AIn the figure, multiple silver paste dots 13 (indicated by a solid line frame) are shown on the front side of the front cell 11, and multiple silver paste dots 13 (indicated by a dotted line frame) are shown on the back side of the rear cell 12. Figure 3A The arrangement of the silver paste dots on the back side of the rear cell 12 is the same, and the arrangement of the silver paste dots on the front side of the rear cell 12 is the same. Figure 3A The arrangement of the silver paste dots on the front side of the front cell 11 is the same.

[0102] Silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the back side of the cell. Figure 3B In the embodiment, silver paste dots 13 are formed on the leading ends of the front main grid lines of the battery cell 11 and the battery cell 12, and silver paste dots 13 are formed on the trailing ends of the back main grid lines of the battery cell 11 and the battery cell 12.

[0103] exist Figure 3C In the figure, silver paste dots 13 are formed at the beginning ends of the odd-numbered main grid lines on the front side of the battery cell 11 and the battery cell 12, silver paste dots 13 are formed at the tail ends of the even-numbered main grid lines on the front side of the battery cell 11 and the battery cell 12, silver paste dots 13 are formed at the tail ends of the odd-numbered main grid lines on the back side of the battery cell 11 and the battery cell 12, and silver paste dots 13 are formed at the beginning ends of the even-numbered main grid lines on the back side of the battery cell 11 and the battery cell 12. Figure 3C In the figure, the silver paste dots 13 on the front side are represented by solid-line boxes, and the silver paste dots 13 on the back side are represented by dotted-line boxes.

[0104] In another possible implementation, silver paste dots are formed at the tail ends of the odd-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the even-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the odd-numbered main grid lines on the back side of the battery cell, and silver paste dots are formed at the tail ends of the even-numbered main grid lines on the back side of the battery cell.

[0105] It should be noted that the above Figure 3A-3C The solid line boxes are used to represent the silver paste dots 13 on the front side of the front battery cell 11, and the dotted line boxes are used to represent the silver paste dots 13 on the back side of the rear battery cell 12. In practice, silver paste dots are set on the front and back sides of each battery cell, and usually the setting positions of the silver paste dots of each battery cell are the same.

[0106] In some embodiments, the adjacent edges of two adjacent battery cells are stacked. In order to avoid hidden cracks caused by welding strips at the adjacent edges of the battery cells, the middle position of each welding strip in the solar cell assembly provided in the present application is flattened.

[0107] In other embodiments, the middle position of each welding strip is bent, and adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0108] In some further embodiments, each welding ribbon is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

[0109] Optionally, the battery cell is a whole battery cell or a battery slice formed by slicing the whole battery cell. The battery slice here can be a two-slice, a three-slice, a four-slice, etc. Figure 1 , Figure 3A-3C The examples are all based on two-piece slicing, and the specifications of battery slicing are not limited in this application.

[0110] To summarize, the solar cell assembly provided by the present application sets the two ends of the welding strips as special-shaped structures so that the head ends of the welding strips in the same group overlap each other, and the tail ends of the welding strips in the same group overlap each other, so that the ends of the welding strips are supported and fixed by the special-shaped structures. This can prevent the head and tail ends of the welding strips from being displaced, increase the welding strength of the welding strips, better fix the position of the welding strips on the battery cell, enhance the welding reliability, and thus reduce the cases of cold soldering and desoldering.

[0111] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0112] Figure 4 : is a flow chart of a method for producing a solar cell module provided in one embodiment of the present application. The method for producing a solar cell module provided in the present application may include the following steps:

[0113] Step 401, pulling the welding ribbon and cutting it to form the i-th group of welding ribbons;

[0114] The number of welding strips in each group is the same, and the i-th group of welding strips includes n welding strips.

[0115] Step 402, performing a first profiling process on the head end of the i-th group of welding strips, so that the head ends of two adjacent welding strips in the i-th group of welding strips overlap;

[0116] Step 403, laying the front half of the i-th group of welding ribbons after the first profile processing on the front main grid line of the i-th solar cell;

[0117] Step 404, performing a second special-shaped processing on the tail end of the i-th group of welding strips, so that the tail ends of two adjacent welding strips in the i-th group of welding strips overlap;

[0118] Step 405, synchronously conveying the i-th cell and the i-th group of welding ribbons forward, laying the i+1-th cell on the rear half of the i-th group of welding ribbons after the second profiling process, and placing the i+1-th cell;

[0119] After i+1, the steps of pulling the welding strip and cutting to form the i-th group of welding strips are continued, that is, iteration is performed until the predetermined number of cells are laid. The predetermined number here can be at least the number required for a battery string, such as 5, 6, 7, 8, 9, 10, 11, etc. This application does not impose too many restrictions on the predetermined number here, as long as it is the number of cells required in the field when producing each battery string.

[0120] Step 406, after the predetermined number of battery cells are laid, the predetermined number of battery cells and welding ribbons are welded.

[0121] For the first specification of the welding strip group, that is, the length of the non-special-shaped structure part of the second to nth welding strips in a group of welding strips is the same as the length of the first welding strip, when executing step 401, the pulled welding strip can be cut by using a dislocation cutter, so that the length of the first welding strip in the i-th group of welding strips formed by cutting is shorter than the length of the second to nth welding strips in the same group, and the centers of the welding strips in the i-th group of welding strips are all located on the same straight line. Correspondingly, when executing step 402, the head ends of the n-th to second welding strips are bent vertically in the direction of the first welding strip in sequence, and the head ends of the second to nth welding strips all form a head end special-shaped structure. Correspondingly, when executing step 404, the tail ends of the n-th to second welding strips are bent vertically in the direction of the first welding strip in sequence, and the tail ends of the second to nth welding strips all form a tail end special-shaped structure.

[0122] For the second specification of the welding strip group, that is, the length of the non-special-shaped structure part of each welding strip on both sides of the j-th welding strip is the same as the length of the j-th welding strip, when executing step 401, the pulled welding strip can be cut by using a dislocation cutter, so that the length of the j-th welding strip in the i-th welding strip formed by cutting is shorter than the length of the 1st to n-th welding strips in the same group except the j-th welding strip, and the centers of each welding strip in the i-th welding strip are located on the same extension line. Correspondingly, when executing step 402, the head ends of each welding strip on both sides of the j-th welding strip are vertically bent toward the direction of the j-th welding strip in turn, and the head ends of each welding strip on both sides of the j-th welding strip form a head end special-shaped structure. Correspondingly, when executing step 404, the tail ends of each welding strip on both sides of the j-th welding strip are vertically bent toward the direction of the j-th welding strip in turn, and the tail ends of each welding strip on both sides of the j-th welding strip form a tail end special-shaped structure.

[0123] For the third type of welding strip group, that is, the length of the non-special-shaped structure part of each welding strip is the same, when executing step 401, the pulled welding strip is cut by using a dislocation cutter, so that the length of the first welding strip in the i-th group of welding strips formed by cutting is the same as the length of the n-th welding strip, and both are shorter than the length of the middle welding strips in the same group, the head end of the first welding strip is aligned with the head end of each middle welding strip, and the tail end of the n-th welding strip is aligned with the tail end of each middle welding strip. Correspondingly, when executing step 402, the head ends of the first to (n-1) welding strips are bent vertically in sequence toward the direction of the n-th welding strip, and the head ends of the first to (n-1) welding strips are all formed into a head end special-shaped structure. Correspondingly, when executing step 404, the tail ends of the n-th to 2nd welding strips are bent vertically in sequence toward the direction of the first welding strip, and the tail ends of the n-th to 2nd welding strips are all formed into a tail end special-shaped structure.

[0124] In practical applications, in order to ensure that after each special-shaped treatment, the end of each group of welding strips that has been special-shaped treated can meet the bending requirements, after the head end of the i-th group of welding strips is subjected to the first special-shaped treatment, the solar cell module production method also includes: detecting the head end of the i-th group of welding strips after the first special-shaped treatment; when the special-shaped structure of the head end of the i-th group of welding strips does not meet the predetermined bending angle, bending the special-shaped structure of the head end of the i-th group of welding strips again.

[0125] After the tail end of the i-th group of welding strips is subjected to a second profiling treatment, the solar cell module production method further includes: inspecting the tail end of the i-th group of welding strips after the second profiling treatment; when the profiling structure of the tail end of the i-th group of welding strips does not meet the predetermined bending angle, bending the profiling structure of the tail end of the i-th group of welding strips again.

[0126] In this way, after the first special-shaped processing and the second special-shaped processing, the special-shaped structure formed after the special-shaped processing is inspected. When the special-shaped structure does not meet the predetermined bending angle, the special-shaped structure is bent again to ensure that the special-shaped structure at the end of the welding strip meets the requirements, so as to improve the lap support and ensure the uniformity of the support force at the end of the welding strip.

[0127] In summary, the solar cell module production method provided by the present application forms a special-shaped structure at the end of the welding strips by subjecting the end of the welding strips of the same group to special-shaped processing, that is, the head ends of the welding strips of the same group overlap each other, and the tail ends of the welding strips of the same group overlap each other, so that the ends of the welding strips are supported and fixed by the special-shaped structure, which can prevent the head and tail of the welding strip from being displaced, increase the welding strength of the welding strip, better fix the position of the welding strip on the battery cell, enhance the welding reliability, and thus reduce the cases of cold soldering and desoldering.

[0128] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0129] Figure 5A is a schematic diagram of the structure of a solar cell module production device provided in one embodiment of the present application, Figure 5B A schematic diagram of a solar cell module production device provided in one embodiment of the present application when stacking welding ribbons and battery cells is shown in FIG. Figure 5A and Figure 5B The solar cell module production equipment provided in the present application may include a solder ribbon feeding device, a solder ribbon pulling device 31, a solder ribbon cutting device 32, a solder ribbon bending device 33, a cell feeding device, a conveying device 34 and a welding device.

[0130] The welding strip feeding device provides welding strips. The welding strips mentioned in the present application can be round welding strips, flat welding strips, special-shaped welding strips, etc., and the types of welding strips are not limited too much here.

[0131] Generally, the solder tape feeding device may include at least a solder tape reel on which the solder tape is wound, a guide structure for guiding the solder tape, a tensioning structure for tensioning the solder tape, and the like.

[0132] The solder strip pulling device 31 pulls the solder strip out from the solder strip feeding device, and the pulled solder strip passes through the solder strip cutting device 32 and the solder strip bending device 33 in sequence.

[0133] The welding strip cutting device 32 cuts the welding strip pulled out by the welding strip pulling device 31. Usually, the welding strip cutting device 32 is fixedly installed. When the welding strip pulled out by the welding strip pulling device 31 is in place, the welding strip cutting device 32 cuts the welding strip at the cutting station to obtain a welding strip 20 that meets the predetermined length. Obviously, the length of the cut welding strip 20 is determined by the distance pulled out by the pulling device each time. In practical applications, the distance that the pulling device pulls the welding strip can be controlled by a software program.

[0134] Generally, in order to ensure the quality of cutting and to ensure that the end of the solder ribbon that is still connected to the solder ribbon feeding device after cutting can be fixed, the solar cell module production equipment provided in the present application may also include a solder ribbon pressing device 35, which is located on the side of the solder ribbon cutting device 32 and between the solder ribbon cutting device 32 and the solder ribbon feeding device, and presses the solder ribbon before the solder ribbon cutting device 32 cuts the solder ribbon.

[0135] Still see Figure 5BAs shown, the welding strip bending device 33 bends the head end and the tail end of the cut welding strip 20 so that the head end and the tail end of each group of welding strips form a special-shaped structure. The special-shaped structure of the head end and the tail end can make the head ends of two adjacent welding strips overlap and the tail ends of two adjacent welding strips overlap.

[0136] The battery cell feeding device and the welding tape pulling device 31 cooperate to stack the battery cells and the bent welding tapes onto the conveying device 34, so that the front half of each group of welding tapes is laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding tapes is laid below the rear main grid line of the rear battery cell between the two adjacent battery cells.

[0137] In one possible implementation, see Figure 5B As shown, when the front battery cell 13 is laid on the conveying device 34 and the front half of the processed welding tape 20 is laid on the front battery cell 13, the tail end of the group of welding tapes 20 is fixed by the welding tape tail clamp 36 arranged at the rear end of the conveying device 34, the welding tape traction device 31 can be withdrawn and returned to the welding tape cutting device 32, and the battery cell feeding device will lay the rear battery cell 14 on the rear half of the group of welding tapes.

[0138] For example, the solder ribbon bending device 33 first bends the head end of the cut solder ribbon 20. After the cut solder ribbon 20 is laid on the battery cell 13 on the conveying device 34, the conveying device 34 conveys the battery cell 13 and the solder ribbon 20 forward. Then, the solder ribbon tail clamp 36 is used to fix the tail end of the solder ribbon 20, and then the solder ribbon bending device 33 is used to bend the tail end of the cut solder ribbon 20.

[0139] The conveying device 34 conveys the stacked battery cells and welding ribbons to the welding device for welding.

[0140] In practical applications, in order to ensure the consistency of the non-shaped portion after the welding strip end is shaped, the welding strip cutting device 32 in the present application is specially designed, as shown in FIG. Figure 6A-6C As shown, the welding strip cutting device 32 may include a first group of blades 321 and a second group of blades 322 and a third group of blades 323 connected to the first group of blades 321. The distance between the second group of blades 322 and the first group of blades 321 and the distance between the third group of blades 323 and the first group of blades 321 are both equal to the length of the special-shaped structure at the end of the welding strip.

[0141] The second set of blades 322 and the third set of blades 323 can be arranged in at least the following three ways to complete the cutting of different welding ribbon groups according to their specifications:

[0142] like Fig. 6A As shown, the second set of blades 322 and the third set of blades 323 are symmetrically arranged on both sides of one end of the first set of blades 321. This welding strip cutting device can cut the following Figure 2A The solder strip shown.

[0143] like Figure 6B As shown, the second set of blades 322 and the third set of blades 323 are respectively arranged at the two ends of the first set of blades 321 and are located on both sides of the first set of blades 321. This welding strip cutting device can cut the following Figure 2B The solder strip shown.

[0144] like Figure 6C As shown, the second set of blades 322 and the third set of blades 323 are symmetrically arranged in the middle of the first set of blades 321. This welding strip cutting device can cut the following Figure 2C The solder strip shown.

[0145] In a possible implementation, the solar cell module production equipment provided by the present application may also include a solder strip flattening device, which is located at the front station of the solder strip cutting device and flattens the solder strip passing through. Generally speaking, the position of the solder strip flattened by the solder strip flattening device is usually the middle part of the solder strip after cutting, and the middle part is located in the middle of the two adjacent solar cells when the two adjacent solar cells are subsequently connected.

[0146] To summarize, the solar cell module production equipment provided in the present application, by providing a welding ribbon bending device, is configured to bend the two ends of the welding ribbon to form a special-shaped structure, so that the head ends of the welding ribbons of the same group overlap each other, and the tail ends of the welding ribbons of the same group overlap each other, so that the ends of the welding ribbons are supported and fixed by the special-shaped structure, which can prevent the head and tail ends of the welding ribbon from being displaced, increase the welding strength of the welding ribbon, better fix the position of the welding ribbon on the battery cell, enhance the welding reliability, and thus reduce the situations of false soldering and desoldering.

[0147] In addition, when the welding point at the end of the welding ribbon is close to the inner side of the battery cell, the length between the welding point on the welding ribbon and the end of the welding ribbon is too long, which can easily cause the end of the welding ribbon to warp. By setting the end of the welding ribbon to a special-shaped structure that overlaps each other, the welding ribbon can be effectively prevented from warping and the occurrence of cold soldering and desoldering can be reduced.

[0148] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the technical features of the application herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not stated in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

[0149] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A solar cell module, characterized in that: The solar cell assembly comprises a predetermined number of cells and at least one group of welding strips for connecting two adjacent cells in series, each group of welding strips comprises n welding strips laid in sequence and in parallel, wherein: The front half of each group of welding strips is laid on the front main grid line of the front battery cell between the two adjacent battery cells, and the rear half of each group of welding strips is laid below the back main grid line of the rear battery cell between the two adjacent battery cells. The leading end and the tail end of each group of welding strips form a special-shaped structure, so that the leading ends of two adjacent welding strips overlap and the tail ends of two adjacent welding strips overlap.

2. The solar cell assembly according to claim 1, characterized in that: The head ends and tail ends of the second to nth welding strips in each group of welding strips are bent toward the direction of the first welding strip.

3. The solar cell assembly according to claim 1, characterized in that: The head end and the tail end of each welding strip located on both sides of the i-th welding strip in each group of welding strips are bent toward the direction of the i-th welding strip.

4. The solar cell assembly according to claim 1, characterized in that: The leading end of the first welding strip in each group of welding strips is bent toward the leading end of the second welding strip, the trailing end of the nth welding strip in the same group of welding strips is bent toward the trailing end of the (n-1)th welding strip, the leading ends of the remaining welding strips in the same group of welding strips are all bent toward the leading end of the nth welding strip, and the trailing ends of the remaining welding strips are all bent toward the trailing end of the first welding strip.

5. The solar cell assembly according to claim 1, characterized in that: The length of the special-shaped structure at the end of each welding strip is the same as the spacing between the welding strip and the adjacent welding strips overlapped by the special-shaped structure.

6. The solar cell assembly according to claim 1, characterized in that: The length of the non-special-shaped structural portion of each welding strip in the same group of welding strips is the same.

7. The solar cell assembly according to any one of claims 1 to 6, characterized in that: Spaced silver paste dots are formed on the front main grid lines and the back main grid lines of the cell; or, Silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the front side of the cell, and silver paste dots are formed on the leading end and / or the trailing end of the main grid line on the back side of the cell; or, The leading end of the odd-numbered busbars on the front of the cell is formed with a silver paste dot, the trailing end of the even-numbered busbars on the front of the cell is formed with a silver paste dot, the trailing end of the odd-numbered busbars on the back of the cell is formed with a silver paste dot, and the leading end of the even-numbered busbars on the back of the cell is formed with a silver paste dot; or, Silver paste dots are formed at the tail ends of the odd-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the even-numbered main grid lines on the front side of the battery cell, silver paste dots are formed at the head ends of the odd-numbered main grid lines on the back side of the battery cell, and silver paste dots are formed at the tail ends of the even-numbered main grid lines on the back side of the battery cell.

8. The solar cell assembly according to any one of claims 1 to 6, characterized in that: The middle of each welding strip is flattened, and two adjacent battery cells are stacked at their adjacent edges; or, The middle of each welding strip is bent, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance; or, Each welding ribbon is a special-shaped welding ribbon formed by connecting two welding ribbon segments of different shapes, and the adjacent edges of two adjacent battery cells are arranged at a predetermined distance.

9. The solar cell assembly according to any one of claims 1 to 6, characterized in that: The battery cell is a whole battery cell or a battery slice formed by slicing the whole battery cell.

10. A method for producing a solar cell module, characterized in that: The solar cell assembly production method comprises: Pulling the welding strip and cutting it to form an i-th group of welding strips, wherein the i-th group of welding strips includes n welding strips; Performing a first profiling process on the head end of the i-th group of welding strips so that the head ends of two adjacent welding strips in the i-th group of welding strips overlap; Laying the front half of the i-th group of welding ribbons after the first special-shaped processing on the front main grid line of the i-th solar cell; Performing a second special-shaped processing on the tail end of the i-th group of welding strips so that the tail ends of two adjacent welding strips in the i-th group of welding strips overlap; Synchronously conveying the i-th cell and the i-th group of welding ribbons forward, laying the i+1-th cell on the rear half of the i-th group of welding ribbons after the second profiling process, and continuing to perform the steps of pulling the welding ribbons and cutting to form the i+1-th group of welding ribbons until a predetermined number of cells are laid; The predetermined number of cells and welding ribbons laid out are welded.

11. The method for producing a solar cell module according to claim 10, characterized in that: The pulling the welding strip and cutting to form the i-th group of welding strips comprises: Using a dislocated cutter to cut the pulled welding strip, the length of the first welding strip in the i-th group of welding strips formed by cutting is shorter than the lengths of the second to n-th welding strips in the same group, and the centers of the welding strips in the i-th group of welding strips are all located on the same straight line; The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises: The head ends of the nth to the second welding strips are sequentially bent vertically toward the direction of the first welding strip, so that the head ends of the second to the nth welding strips all form head end special-shaped structures; The second profiling of the tail end of the i-th group of welding strips comprises: The tail ends of the nth to second welding strips are bent vertically in the direction of the first welding strip in sequence, so that the tail ends of the second to nth welding strips all form tail end special-shaped structures; The lengths of the non-special-shaped structural parts of the second to nth welding strips are the same as the length of the first welding strip.

12. The method for producing a solar cell module according to claim 10, characterized in that: The pulling the welding strip and cutting to form the i-th group of welding strips comprises: The pulled welding strip is cut by using a dislocated cutter, so that the length of the jth welding strip in the i-th group of welding strips formed by cutting is shorter than the lengths of the first to n-th welding strips in the same group except the j-th welding strip, and the centers of the welding strips in the i-th group of welding strips are all located on the same extension line, 1<j<n; The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises: The head ends of the welding strips on both sides of the j-th welding strip are bent vertically in the direction of the j-th welding strip in sequence, so that the head ends of the welding strips on both sides of the j-th welding strip form head end special-shaped structures; The second profiling of the tail end of the i-th group of welding strips comprises: The tail ends of each welding strip on both sides of the j-th welding strip are bent vertically in the direction of the j-th welding strip in sequence, so that the tail ends of each welding strip on both sides of the j-th welding strip form tail end special-shaped structures; The length of the non-special-shaped structure portion of each welding strip on both sides of the j-th welding strip is the same as the length of the j-th welding strip.

13. The method for producing a solar cell module according to claim 10, characterized in that: The pulling the welding strip and cutting to form the i-th group of welding strips comprises: The pulled welding strip is cut by using a dislocation cutter, so that the length of the first welding strip in the i-th group of welding strips formed by cutting is the same as the length of the n-th welding strip, and both are shorter than the lengths of the middle welding strips in the same group, the head end of the first welding strip is aligned with the head ends of the middle welding strips, and the tail end of the n-th welding strip is aligned with the tail ends of the middle welding strips; The first step of performing a first profile processing on the head end of the i-th group of welding strips comprises: The head ends of the first to (n-1)th welding strips are bent vertically in the direction of the nth welding strip in sequence, and the head ends of the first to (n-1)th welding strips are all formed into head end special-shaped structures; The second profiling of the tail end of the i-th group of welding strips comprises: The tail ends of the nth to second welding strips are bent vertically toward the direction of the first welding strip in sequence, and the tail ends of the nth to second welding strips all form tail end special-shaped structures; The lengths of the non-special-shaped structural parts of each welding strip are the same.

14. The method for producing a solar cell module according to claim 10, characterized in that: After the first profiling process is performed on the head end of the i-th group of welding ribbons, the solar cell assembly production method further includes: Detecting the head end of the i-th group of welding strips after the first profiling process; When the special-shaped structure at the head end of the i-th group of welding strips does not meet the predetermined bending angle, the special-shaped structure at the head end of the i-th group of welding strips is bent again; After performing a second profiling process on the tail end of the i-th group of welding ribbons, the solar cell module production method further includes: Detecting the tail end of the i-th group of welding ribbons after the second profiling process; When the special-shaped structure of the tail end of the i-th group of welding strips does not meet the predetermined bending angle, the special-shaped structure of the tail end of the i-th group of welding strips is bent again.

15. A solar cell module production device, characterized in that: The solar cell assembly production equipment includes a welding strip feeding device, a welding strip pulling device, a welding strip cutting device, a welding strip bending device, a battery cell feeding device, a conveying device and a welding device, wherein: The welding ribbon feeding device provides welding ribbon; The welding ribbon pulling device pulls the welding ribbon out from the welding ribbon feeding device, and the pulled welding ribbon passes through the welding ribbon cutting device and the welding ribbon bending device in sequence; The welding ribbon cutting device cuts the welding ribbon pulled out by the welding ribbon pulling device; The welding strip bending device bends the head end and the tail end of the cut welding strip, so that the head end and the tail end of each group of welding strips form a special-shaped structure, so that the head ends of two adjacent welding strips overlap and the tail ends of two adjacent welding strips overlap; The cell feeding device cooperates with the welding tape pulling device to stack the cells and the bent welding tapes on the conveying device, so that the front half of each group of welding tapes is laid on the front main grid line of the front cell of the two adjacent cells, and the rear half of each group of welding tapes is laid below the rear main grid line of the rear cell of the two adjacent cells; The conveying device conveys the stacked battery cells and welding ribbons to the welding device for welding.

16. The solar cell module production equipment according to claim 15, characterized in that: The welding strip cutting device comprises a first set of blades, and a second set of blades and a third set of blades connected to the first set of blades, wherein the distance between the second set of blades and the first set of blades, and the distance between the third set of blades and the first set of blades are both equal to the length of the special-shaped structure at the end of the welding strip; The second set of blades and the third set of blades are symmetrically arranged on both sides of one end of the first set of blades; or, The second set of blades and the third set of blades are respectively arranged at two ends of the first set of blades and located on both sides of the first set of blades; or, The second group of blades and the third group of blades are symmetrically arranged at the middle position of the first group of blades.

17. The solar cell module production equipment according to claim 15, characterized in that: The solar cell assembly production equipment also includes a solder strip flattening device, which is located at a front station of the solder strip cutting device and performs a flattening process on the solder strip passing through.

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