A method and device for producing a variable-section special-shaped welding ribbon solar cell string

Abstract

The present invention provides a method for producing a solar cell string with a variable-section shaped welding ribbon. The method is mainly aimed at a solar cell string welded with a variable-section shaped welding ribbon. A limiting mechanism is set on the channel for conveying the variable-section shaped welding ribbon to perform position accuracy correction on the passing welding ribbon to ensure that the length of the shaped segment completely covering the front of the battery cell is consistent. The device for implementing the above method needs to add a limiting mechanism to the existing tape making station so that the shaped segment of the variable-section shaped welding ribbon cannot pass through. When the welding ribbon retreats under the drive of the heavy hammer wheel, each welding ribbon will be stuck at the limiting mechanism to ensure that the front and rear positions are consistent after cutting. The equipment required for using this method mainly includes: a tape supply device, a tape feeding mechanism, a bending mechanism, a limiting mechanism, a tape cutting mechanism and a tape pulling mechanism.

Description

Technical Field

[0001] The present invention relates to a method for producing a solar cell string, and in particular to a method for producing a solar cell string with a variable cross-section and a special-shaped welding ribbon, and also to a special device for implementing the method. Background Art

[0002] Photovoltaic welding ribbons are also called tinned copper ribbons or tin-coated copper ribbons. They are divided into busbars and interconnection strips, and are used to connect photovoltaic module cells. A number of parallel silver interconnection electrodes (interconnection electrodes for short) are symmetrically arranged on both sides of the solar cell. Multiple solar cells can be connected in series by overlapping the welding ribbons on the interconnection electrodes of two adjacent solar cells. Specifically, the solar cells and welding ribbons are placed and positioned on the platform of the stringing machine, so that the solar cells and welding ribbons are aligned, and then high-temperature heating and welding are performed to connect the solar cells in series.

[0003] Traditional welding strips are mostly tinned copper flat strips (also called flat welding strips). However, with the development of the industry, welding strips of other shapes have emerged, also called special-shaped welding strips. For example, triangular welding strips are the most common special-shaped welding strips, and their cross-section is triangular. Using special-shaped welding strips to string together multiple solar cells can reduce the area of ​​the solar cell covered by the welding strips and increase the light receiving rate of the solar cell.

[0004] The publication number is: CN110280585A, and the name is: A calendering device for a segmented triangular welding strip. The specification discloses a special-shaped welding strip made according to the characteristics of the interconnection of solar cell strings. There are multiple continuous periodic welding strip units on the welding strip wire, and each welding strip unit includes a triangular segment, a flat strip segment, and a transition segment connecting the triangular segment and the flat strip segment. Therefore, when interconnecting with the battery cell, the welding strip portion placed on the front of the battery cell is triangular, while the battery cell interconnection segment and the welding strip portion placed on the back of the battery cell are flat. In the solar cell string welding machine for preparing battery strings, when the welding strip roll is different due to different materials and different preparation accuracy, the triangular welding strip arranged on the front of the battery cell will be inconsistent in length or have large deviations, resulting in defects in the preparation of the battery string. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a method and a device for producing a solar cell string with a variable-section special-shaped welding ribbon.

[0006] The position accuracy correction described in the present invention is to correct the length of the irregular section of the second welding ribbon to be laid on the solar cell, so as to ensure that the lengths of the irregular sections of multiple second welding ribbons on the same solar cell are consistent.

[0007] The welding strip used in the present invention is a periodically changing variable cross-section shaped welding strip, wherein the shaped section needs to be welded on the front grid line of the battery cell, and the flat section needs to be welded on the back grid line of the battery cell. There are usually multiple grid lines on the battery cell. In order to ensure that the welding strips arranged on each main grid line on the same battery cell are flush during the process of laying and making the welding strip, the present invention proposes a method for producing a variable cross-section shaped welding strip solar cell string, and the specific steps are as follows:

[0008] Firstly, a first welding strip of a first length is laid;

[0009] Then, sequentially placing solar cells and second welding ribbons of the second length, connecting at least two solar cells by laying at least one second welding ribbon of the second length, until a solar cell string of a target length is connected together;

[0010] The variable-section special-shaped welding strip is formed by regularly repeating the second welding strip;

[0011] The second welding strip includes a flat section and a shaped section. A limiting mechanism is provided on the channel for conveying the variable-section shaped welding strip, which is used to perform position accuracy correction on at least one second welding strip of a second length passing through, so as to ensure that the length of the shaped section completely covering the front of the battery cell is consistent. The "at least one second welding strip of a second length performs position accuracy correction" mentioned here means that during the production process of the battery string, the position accuracy correction of the second welding strip is performed for each solar cell and a second welding strip laid. The position accuracy correction of the second welding strip can also be performed after the solar cell and the second welding strip are laid in sequence for multiple times. The specific timing of the correction is set according to the production accuracy requirements.

[0012] Furthermore, when the position accuracy of the variable-section shaped welding strip is corrected, the limiting mechanism only allows the flat section to pass through, so that the shaped sections of multiple mutually parallel variable-section shaped welding strips are restricted from continuing to be transmitted forward when they are transmitted to the limiting mechanism.

[0013] Furthermore, after the limiting mechanism performs position accuracy correction on at least one second welding strip of the second length passing through, the second welding strip of the second length is cut off and separated from the variable-section special-shaped welding strip, and the welding strip is cut after the position accuracy correction, which can improve the consistency of the length of the special-shaped section of the second welding strip after cutting.

[0014] Furthermore, before or after the position accuracy correction of at least one second welding ribbon of the second length is performed by the position limiting mechanism, the connecting section between the battery cells of the second welding ribbon is bent. The position accuracy correction described here can be achieved by the technical means of "making the position limiting mechanism only allow the flat section to pass through". Bending the connecting section between the battery cells of the second welding ribbon belongs to the prior art. The technical solution proposed here is aimed at the overall concept of the present invention: "performing position accuracy correction on at least one second welding ribbon of the second length that passes through" to provide the position where the bending mechanism of the prior art can be set.

[0015] The present invention also provides a device for producing a variable-section special-shaped welding ribbon solar cell string, which is used to implement the above method, and the device at least comprises:

[0016] A tape supply device, used for installing a tape supply roll of a variable-section special-shaped welding tape, and rotating the tape supply roll when necessary to release the variable-section special-shaped welding tape;

[0017] The weight wheel is arranged between the tape supply device and the tape delivery mechanism and is used to tension the variable-section special-shaped welding tape;

[0018] A base plate is placed at the bottom of the tape making station, on which a guide groove is provided for the passage of the variable-section special-shaped welding tape;

[0019] The tape feeding mechanism is used to clamp the variable-section special-shaped welding tape and convey it to the tape making station;

[0020] A bending mechanism, arranged in the transmission direction of the variable-section special-shaped welding ribbon, is used to bend the second welding ribbon at the connecting section between the battery cells;

[0021] A cutter mechanism, used for cutting and separating the variable-section special-shaped welding strip according to a first length or a second length;

[0022] The belt pulling mechanism is used to pull the variable-section special-shaped welding belt to the bottom of the cutting mechanism, and arrange the first welding belt and the second welding belt cut and separated from the variable-section special-shaped welding belt at the position where the battery cell is placed;

[0023] It also includes: a limiting mechanism, which is arranged above the substrate and is used to limit the second welding strip to prevent the special-shaped segment from passing through;

[0024] The bending mechanism is located in front of or behind the limiting mechanism;

[0025] The belt feeding mechanism is located behind the bending mechanism and the limiting mechanism along the conveying direction of the variable-section special-shaped welding belt;

[0026] The cutting mechanism is located behind or before the bending mechanism along the conveying direction of the variable-section special-shaped welding strip.

[0027] Furthermore, the limiting mechanism includes a component capable of reciprocating up and down, and when the component is located at the lower limit position, its bottom and the guide groove on the substrate form a limiting channel, allowing only the flat section of the variable-section special-shaped welding strip to pass through.

[0028] Furthermore, the limiting mechanism includes a device for adjusting the height of the limiting channel to adapt to the variable cross-section special-shaped welding strips of different thicknesses and cross-sectional shapes, and to ensure that no matter whether the bending mechanism is installed before or after the limiting mechanism, the limiting channel can only limit the passage of the special-shaped section.

[0029] Furthermore, the limiting mechanism includes a device for driving the up and down reciprocating motion component.

[0030] Furthermore, the device for driving the up-and-down reciprocating component includes: a compressed air circuit arranged at the upper end of the component and a return spring sleeved at the lower end of the component; or a spring sleeved at the upper end of the component and a compressed air circuit arranged at the lower end of the component; or compressed air circuits arranged at both ends of the component; or a crank-connecting rod mechanism that drives the component to reciprocate up and down; or a guide rail screw mechanism that drives the component to reciprocate up and down

[0031] Furthermore, the part of the component that reciprocates up and down and contacts the solder strip has a wedge-shaped end, and the slope of the wedge is adapted to the slope of the connecting section between the battery cells after bending.

[0032] The technical effect of the present invention is that: the tape supply mechanism provides a variable-section special-shaped welding tape to be cut into sections, the tape feeding mechanism conveys the welding tape to the tape making station, the tape pulling mechanism pulls out a section of special-shaped welding tape according to the required length of the welding tape, and the limiting mechanism corrects the position accuracy of the special-shaped welding tape;

[0033] During correction, the part of the limiting mechanism that reciprocates up and down will move to the lower position. When the part is at the lower limit position, its bottom and the guide groove on the substrate form a limiting channel, allowing only the flat section of the variable-section special-shaped welding strip to pass through. Therefore, when the heavy hammer wheel pulls the welding strip back, the starting end of the special-shaped section of the welding strip is stuck in the limiting channel. At this point, each second welding strip on the same battery cell uses the "last contact point with the limiting mechanism along the transmission direction" as the reference point to realize the position correction of the length of the special-shaped section of the second welding strip. At the correction reference point, the cross-sectional shape of each second welding strip is the same. After the second welding strip is cut off and corrected, the length of its special-shaped section is consistent. The positions of the special-shaped sections on the multiple welding strips transmitted thereafter are also corrected and aligned, thereby ensuring that the positions of the special-shaped sections of the second welding strips on the same battery cell in the battery string are aligned after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 2. It is a front view of a variable-section special-shaped welding strip in an embodiment;

[0035] Figure 2 is a cross-sectional view of a special-shaped section of a special-shaped welding strip with a variable cross-section in an embodiment;

[0036] Figure 3 is a cross-sectional view of a flat section of a variable-section special-shaped welding strip in an embodiment;

[0037] Figure 4 This is a front view of the positional relationship between the variable-section special-shaped welding strip and the limiting mechanism in the embodiment;

[0038] Figure 5 This is a front view of a variable-section special-shaped welding ribbon and a battery cell welded into a string in an embodiment;

[0039] Figure 6 This is a front view of the positional relationship between the limiting mechanism and the substrate in the embodiment;

[0040] Figure 7 is a cross-sectional view of the positional relationship between the limiting mechanism and the substrate in the embodiment;

[0041] Figure 8 is a schematic diagram of a second implementation of the up and down reciprocating motion component in the embodiment;

[0042] Fig. 9 is a schematic diagram of a third implementation of the up and down reciprocating motion component in the embodiment;

[0043] Fig.10 A schematic diagram of a fourth implementation of the up and down reciprocating motion component in the embodiment;

[0044] Fig.11 A schematic diagram of a fifth implementation of the up and down reciprocating motion component in the embodiment;

[0045] Fig.12 is a cross-sectional view of the internal structure of the limiting mechanism in the embodiment;

[0046] Fig.13 It is a partial enlarged view of the position relationship between the component that reciprocates up and down and the welding strip in the embodiment;

[0047] Fig.14 This is a schematic diagram of a first embodiment of the device for producing a variable-section special-shaped welding ribbon solar cell string (1) in Example 1;

[0048] Fig.15 This is the second embodiment of the device for producing a variable-section special-shaped welding ribbon solar cell string (1) in Example 2;

[0049] Fig.16 It is a schematic diagram of a third embodiment of the device for producing a variable-section special-shaped welding ribbon solar cell string (1) in Example 3.

[0050] In the figure, 1. battery string, 40. substrate, 50. tape supply device, 51. weight wheel, 61. tape feeding mechanism, 62. limiting mechanism, 63. bending mechanism, 64. tape cutting mechanism, 65. tape pulling mechanism, 100. special-shaped welding tape, 100-1. special-shaped section, 100-2. flat section, 100-3. connecting section between battery cells, 200. battery cell, 200-1. front side of battery cell, 200-2. back side of battery cell, 621. limiting cylinder head, 622. limiting cylinder body, 623. sealing ring, 624. spring, 625. up and down reciprocating motion component, 6251. wedge-shaped end. DETAILED DESCRIPTION

[0051] Combine the following Figures 1 to 15 Specific embodiments of the present invention will be described.

[0052] Embodiment 1:

[0053] Figures 1 to 3 The structure of the variable cross-section special-shaped welding strip 100 is shown schematically, including a special-shaped section 100-1, a flat section 100-2 and a connecting section 100-3 between battery cells;

[0054] The cross section of the special-shaped segment 100 - 1 may be triangular, circular, etc., and the height of the cross section thereof is different from the height of the cross section of the flat segment 100 - 3 .

[0055] In this embodiment, the cross section of the special-shaped segment 100 - 1 is a triangle, and its cross section height is K. The cross section height of the flat segment 100 - 2 is S, and K>S.

[0056] Figure 4 The diagram illustrates the positional relationship between the variable-section special-shaped welding strip 100 and the limiting mechanism 62 during precision calibration, wherein the limiting mechanism 62 should be provided at the connecting section 100 - 3 between the battery cells of the welding strip to perform positional precision calibration on the welding strip.

[0057] Figure 5 The schematic diagram of the corrected special-shaped welding ribbon and the solar cell being welded into a string is shown. The length of the first welding ribbon of the solar cell string 1 is L1, and the length of the second welding ribbon is L2;

[0058] The first welding strip is welded to the back side 200 - 2 of the first battery cell;

[0059] The special-shaped section 100-1 of the second welding strip is welded to the front side 200-1 of the battery cell, and the flat section 100-2 of the second welding strip is welded to the back side 200-1 of another battery cell. At least one second welding strip connects at least two solar cells 200, and so on, to weld several battery cells into a string.

[0060] Figure 6The positional relationship between the limiting mechanism 62 and the substrate 40 is illustrated. The limiting mechanism 62 is arranged above the substrate 40. The limiting mechanism 62 is provided with a component 625 capable of reciprocating up and down. The component 625 and the welding strip guide groove on the substrate 40 form a limiting channel.

[0061] When the component 625 is in the upper position, the limiting channel allows the entire variable-section shaped welding strip 100 to pass through; when the component 625 is in the lower position, the limiting channel only allows the flat section 100-2 of the variable-section shaped welding strip 100 to pass through.

[0062] Figure 7 A first implementation of the limiting mechanism 62 is illustrated.

[0063] The limiting mechanism 62 includes a device for driving the component 625, which is preferably designed in the form of a single-acting cylinder, and uses a spring 624 and compressed air to make the component 625 reciprocate up and down.

[0064] This component is installed in the piston hole on the limiting cylinder body 622. A limiting cylinder cover 621 is provided on the upper part of the limiting cylinder body 622. An air path connected to the compressed air is provided on the limiting cylinder cover 621 corresponding to the top position of each component 625. By setting different air paths, each component 625 can perform up and down reciprocating motion individually, or all components 625 can perform up and down reciprocating motion synchronously.

[0065] A sealing ring 623 is provided between the limiting cylinder body 622 and the limiting cylinder cover 621 to prevent air leakage from the mounting surface, so that the pressure of the compressed air is fully applied to the component 625; the spring 624 is sleeved on the component 625, the upper end of the spring 624 contacts the component 625, and the lower end contacts the step in the piston hole; when the compressed air is not introduced into the air circuit of the limiting cylinder cover 621, the component 625 remains in the upper position, and when the compressed air is introduced into the air circuit of the limiting cylinder cover 621, the component 625 moves to the lower position. Therefore, the maximum elastic force of the spring 624 should be less than the pressure of the compressed air acting on the component 625, and the minimum elastic force of the spring 624 should be greater than the sum of the friction between the component 625 and the piston hole and the self-weight of the component 625.

[0066] Figures 8 to 10 The figure shows three other embodiments of the device for driving the component 625 to reciprocate up and down on the limit mechanism. They mainly include: a double-acting cylinder mechanism, a crank connecting rod guide mechanism, and a screw guide mechanism. The above three driving mechanisms can replace the device capable of driving the component 625 to reciprocate up and down in the above preferred embodiment.

[0067] Fig.11The fifth embodiment of the device for driving the component 625 to reciprocate up and down on the limit mechanism is shown, which is different from the first embodiment in that the spring 624 is arranged above the component 625, and the air path is arranged at the extended end of the component 625. When no compressed air is passed into the limit mechanism 62, the component 625 is always in the lower position.

[0068] Fig.12 The internal structure of the limiting mechanism 62 is shown. Fig.13 The figure shows the positional relationship between the component 625 that reciprocates up and down and the solder strip when in the lower position, wherein the contact portion of the component 625 with the solder strip has a wedge-shaped end 6251, and the slope of the wedge is adapted to the slope of the starting end of the special-shaped segment 100-1.

[0069] When component 625 is in the lower position, the pulling mechanism 63 releases the clamped welding strip, and under the tensioning action of the weight wheel 51, the starting end of the special-shaped section 100-1 of the variable-section special-shaped welding strip 100 is stuck in the limiting channel formed by the component 625 and the welding strip guide groove on the substrate 40.

[0070] Fig.14 The layout diagram of the first embodiment of the device for producing a variable-section shaped solder ribbon solar cell string 1 is shown.

[0071] The variable-section special-shaped welding tape 100 extends from the welding tape roll on the tape supply mechanism 50, bypasses the weight wheel 51, and enters the tape feeding mechanism 61. Along the direction of the welding tape transmission, the front end of the tape feeding mechanism 61 is provided with a bending mechanism 63, a limiting mechanism 62, a tape cutting mechanism 64, and a tape pulling mechanism 65 in sequence, wherein the tape pulling mechanism 65 can reciprocate in front of the tape cutting mechanism 64 and its tape cutting mechanism.

[0072] According to the above schematic diagram, the positions of the various mechanisms can be arranged, and the following method can be used to produce a variable-section special-shaped welding ribbon solar cell string 1:

[0073] First, lay a first welding strip of first length L1;

[0074] Then, the solar cell sheets 200 and the second welding ribbons of the second length L2 are sequentially placed, and at least two solar cell sheets 200 are connected by laying at least one second welding ribbon of the second length L2, until the solar cell strings of the target length are connected together;

[0075] The variable-section special-shaped welding strip 100 is formed by regularly and repeatedly arranging the second welding strips;

[0076] The second welding strip includes a flat section 100-2 and a shaped section 100-1. A limiting mechanism 62 is provided on the channel for conveying the variable-section shaped welding strip 100, for performing position accuracy correction on at least one second welding strip of a second length L2 passing through, so as to ensure that the length of the shaped section 100-1 completely covering the front side 200-1 of the battery cell is consistent.

[0077] Working principle: When using the variable-section special-shaped welding ribbon 100 to produce a solar cell string, it is necessary to weld the special-shaped section 100-1 of the welding ribbon to the front side 200-1 of the battery cell, and weld the flat section 100-2 of the welding ribbon to the back side 200-2 of the battery cell. In order to obtain a plurality of second welding ribbons with the same length of special-shaped sections and flush ends before welding the battery string 1, it is necessary to add a limiting mechanism 62 to the tape making station of the string welding machine. The limiting mechanism 62 is provided with a component 625 that can reciprocate up and down. The component 625 and the guide groove on the substrate 40 at the tape making station form a limiting channel. When the component 625 is in the upper position, the limiting channel allows the entire variable-section special-shaped welding ribbon 100 to pass through; when the component 625 is in the lower position, the limiting channel only allows the flat section 100-2 of the variable-section special-shaped welding ribbon 100 to pass through. Each time the strip is made, the strip drawing mechanism 65 will pull the variable cross-section special-shaped welding strip 100 out of the limiting channel and make the special-shaped section 100-2 located at the front end of the limiting mechanism. When precision calibration is required, the component 625 moves to the lower position, and the strip drawing mechanism 65 releases the pulled welding strip. Due to the loss of the traction of the strip drawing mechanism 65, the welding strip will withdraw to the rear of the limiting mechanism 62 along the guide groove under the action of the weight wheel 51;

[0078] At this time, the limiting channel moves downward due to component 625, and the special-shaped segment 100-1 of the welding tape cannot exit the limiting channel. All welding tapes are stuck in the limiting channel with the last contact point with the limiting mechanism along the transmission direction as the reference, so as to obtain welding tapes with uniform front and back positions; the corrected welding tapes continue to complete the work of tape making and tape laying with the cooperation of the tape pulling mechanism, the cutting mechanism, the bending mechanism and the tape feeding mechanism.

[0079] Embodiment 2

[0080] Fig.15 A layout diagram of a second embodiment of a device for producing a variable-section shaped solder ribbon solar cell string 1 is shown;

[0081] The difference from the first embodiment is that: along the direction of the welding tape transmission, the front end of the tape feeding mechanism 61 is provided with a limiting mechanism 62, a bending mechanism 63, a tape cutting mechanism 64, and a tape pulling mechanism 65 in sequence.

[0082] Embodiment 3

[0083] Fig.16 A layout diagram of a third embodiment of a device for producing a variable-section shaped solder ribbon solar cell string 1 is shown;

[0084] The difference from the first embodiment is that: along the direction of the welding tape transmission, the front end of the tape feeding mechanism 61 is provided with a limiting mechanism 62, a cutting mechanism 64, a bending mechanism 63, and a tape pulling mechanism 65 in sequence.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not desulfurize the essence of the corresponding technical solutions and exceed the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing a solar cell string (1) with a variable-section shaped welding ribbon (100), comprising the following steps: First, a first welding strip of a first length (L1) is laid; Then, placing the solar cell sheets (200) and the second welding ribbon of the second length (L2) in sequence, and connecting at least two solar cell sheets (200) by laying at least one second welding ribbon of the second length (L2), until a solar cell string of a target length is connected together; The variable-section special-shaped welding strip (100) is formed by regularly and repeatedly arranging the second welding strips; Characterized in that the second welding strip comprises a flat section (100-2) and a shaped section (100-1), and a limiting mechanism (62) is provided on a channel for conveying the variable-section shaped welding strip (100), for performing position accuracy correction on at least one second welding strip of a second length (L2) passing therethrough, so as to ensure that the shaped section (100-1) completely covering the front side (200-1) of the battery cell has a consistent length, and the cross-sectional height K of the shaped section (100-1) is greater than the cross-sectional height S of the flat section (100-2); When the position accuracy of the variable-cross-section special-shaped welding strip (100) is corrected, the limiting mechanism (62) only allows the flat section (100-2) to pass through.

2. The method according to claim 1, characterized in that After the position limiting mechanism (62) performs position accuracy correction on at least one second welding strip of a second length (L2) passing through, the second welding strip of the second length is cut off and separated from the variable-section special-shaped welding strip (100).

3. The method according to claim 1, characterized in that The limiting mechanism (62) bends the inter-cell connecting section (100-3) of the second welding strip before or after performing position accuracy correction on at least one second welding strip of a second length (L2) passing through.

4. A device for producing a variable-section special-shaped solder ribbon solar cell string (1), the device being used to perform any of the methods of claims 1 to 3, the structure comprising: A tape supply device (50) for installing a tape supply roll of a variable-section shaped welding tape (100) and causing the tape supply roll to rotate when necessary to release the variable-section shaped welding tape (100); A weight wheel (51) is arranged between the tape supply device (50) and the tape feeding mechanism (61) and is used for tensioning the variable-section special-shaped welding tape (100); A base plate (40) is placed at the bottom of the tape making station and is provided with a guide groove for the variable-section special-shaped welding tape (100) to pass through; A tape feeding mechanism (61) is used to clamp the variable-section special-shaped welding tape (100) and convey it to a tape making station; A bending mechanism (63) is arranged in the transmission direction of the variable-cross-section special-shaped welding ribbon (100) and is used to bend the second welding ribbon at the connecting section (100-3) between the battery cells; A cutting mechanism (64) is used to cut and separate the variable-cross-section special-shaped welding strip (100) according to a first length (L1) or a second length (L2); The strip pulling mechanism (65) is used to pull the variable-section shaped welding strip (100) to below the cutting mechanism (64), and to arrange the first welding strip and the second welding strip cut and separated from the variable-section shaped welding strip (100) at a position where the battery cell (200) is placed; It is characterized by further comprising: a limiting mechanism (62) disposed above the substrate (40) and used to limit the second welding strip to prevent the special-shaped segment (100-1) from passing through; The bending mechanism (63) is located in front of or behind the limiting mechanism (62); The belt conveying mechanism (61) is located behind the bending mechanism (63) and the limiting mechanism (62) along the conveying direction of the variable-section special-shaped welding belt (100); The cutting mechanism (64) is located behind or before the bending mechanism (63) along the conveying direction of the variable-cross-section special-shaped welding strip (100).

5. The device for producing a variable-section shaped solder ribbon solar cell string (1) according to claim 4, characterized in that: The limiting mechanism (62) comprises a component (625) capable of reciprocating up and down, and when the component (625) is located at the lower limit position, its bottom and the guide groove on the substrate (40) form a limiting channel, allowing only the flat section (100-2) of the variable-section special-shaped welding strip (100) to pass through.

6. The device for producing a variable-section shaped solder ribbon solar cell string (1) according to claim 5, characterized in that: The limiting mechanism (62) comprises a device for adjusting the height of the limiting channel.

7. The device for producing a variable-section shaped solder ribbon solar cell string (1) according to claim 5 or 6, characterized in that: The limiting mechanism (62) comprises a device for driving the up and down reciprocating component.

8. The device for producing a variable-section shaped solder ribbon solar cell string (1) according to claim 7, characterized in that: The device for driving the upward and downward reciprocating component comprises: a compressed air circuit arranged at the upper end of the component (625) and a return spring (624) sleeved on the lower end of the component (625); or a spring (624) sleeved on the upper end of the component (625) and a compressed air circuit arranged at the lower end of the component (625); or compressed air circuits arranged at the upper and lower ends of the component (625); or a crank-connecting rod mechanism for driving the component (625) to perform upward and downward reciprocating motion; or a guide rail screw mechanism for driving the component (625) to perform upward and downward reciprocating motion.

9. The device for producing a variable-section shaped solder ribbon solar cell string (1) according to claim 5, characterized in that: The portion of the component (625) that reciprocates up and down and that contacts the variable-section special-shaped welding strip (100) has a wedge-shaped end portion (6251), and the slope of the wedge shape is adapted to the slope of the inter-cell connecting section (100-3) after bending.

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