Welding strip preparation method and device

Abstract

The present invention discloses a method and device for preparing a welding strip, which comprises: cutting one or more original welding strips extending in the X direction into m welding strips, each of which extends in the X direction, rotating the extending direction of the welding strip to the Y direction and then used to weld two adjacent battery cells in a solar cell string, wherein the X direction intersects with the Y direction, and the welding strip preparation device comprises a welding strip winding mechanism, a pulling mechanism, a cutting mechanism, a clamping mechanism and a rotating mechanism, which are used to prepare the welding strip using the welding strip preparation method provided by the present invention. The welding strip preparation method and device provided by the present invention can simultaneously supply materials for the production of multiple parallel battery strings with a set of feeding equipment, which greatly reduces the cost.

Description

Technical Field

[0001] The invention relates to a solar cell string production technology, and in particular to a welding strip preparation method and device. Background Art

[0002] With the rise of energy prices, the development and utilization of new energy has become the main research topic in the energy field today. Since solar energy has the advantages of no pollution, no regional restrictions, and inexhaustible, the study of solar power generation has become the main direction of the development and utilization of new energy. Using solar panels to generate electricity is a major way for people to use solar energy today. However, there are still problems such as insufficient production capacity of solar panels and low cost / output ratio.

[0003] Conventional photovoltaic module production equipment arranges cells into a single string and connects the cells with welding ribbons. Ten years ago, the welding speed was 1200UPH, and now the single-track welding speed has basically reached 2000UPH. In the existing technology, the welding speed is within 4000UPH with dual tracks as the main welding speed. The reason is that the cells are mainly multi-main grid, so the speed design of the equipment has been limited by factors such as welding materials, cell placement, welding material fixing and limiting, and welding action. The welding ribbon feeding method is a very large constraint and has not been able to achieve a fundamental breakthrough.

[0004] The method for connecting solar cells in series is as follows: a welding ribbon feeding mechanism can provide a group of mutually parallel welding ribbons (conductor ribbons), each cell has a plurality of mutually parallel grid lines on the front and back sides, and the welding ribbon is used to connect the front side of a cell with the back side of an adjacent cell, and each welding ribbon is correspondingly clamped in the grid lines of two cells, and the automated equipment continuously and alternately places the welding ribbons and the cells, and transmits and welds them to form an interconnected cell string, wherein the length extension direction of the welding ribbon, the length extension direction of the grid line and the extension direction of the cell string are parallel to or coincide with each other.

[0005] The conventional method of feeding the welding ribbon in series welding is to set up multiple sets of welding ribbon feeding mechanisms in parallel to the direction of the battery grid line. In order to meet the needs of multi-parallel welding (welding multiple battery strings at the same time), the number of welding ribbon feeding mechanisms will be greatly increased. Fig.23 For example, if there are m parallel cells and each cell has n grid lines, then m groups of ribbon feeding mechanisms are needed, each of which can provide n ribbons. As the number of parallel cells or grid lines increases, the total number of ribbon feeding mechanisms m will increase significantly. Therefore, the floor space and cost of the equipment are greatly increased, and it also brings great trouble to the use and maintenance of the equipment in the later stage. Summary of the invention

[0006] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a method and device for preparing a solder strip, so as to realize the simultaneous production and supply of multiple parallel battery strings using a group of solder strip preparation devices.

[0007] In order to solve the problems existing in the prior art, on the one hand, the present invention provides a method for preparing a welding strip, comprising the following steps:

[0008] Cutting the original welding strip extending along the X' direction into m welding strips, m ≥ 2, each welding strip extending along the X' direction;

[0009] The extending direction of the welding strip is rotated to the Y direction and then used to weld two adjacent solar cells in a solar cell string.

[0010] Further, the X' direction intersects with the Y direction.

[0011] In another aspect, the present invention provides a method for preparing a welding ribbon, wherein the welding ribbon is used for welding cells in a solar cell string, comprising the following steps:

[0012] Fixing two ends of an original welding strip and shaping the original welding strip;

[0013] After cutting the original welding strip, m welding strips are obtained, where m≥2, and both ends of each welding strip are fixed.

[0014] Furthermore, the action of fixing the two ends of the welding strip is performed earlier than or simultaneously with the cutting action.

[0015] In another aspect, the present invention provides a method for preparing a welding ribbon, wherein the welding ribbon is used for welding cells in a solar cell string, comprising the following steps:

[0016] Pull out the welding tape wound on the welding tape winding mechanism, cut it after shaping, and obtain the original welding tape;

[0017] After cutting the original welding strip, m welding strips are obtained, where m≥2, and both ends of each welding strip are fixed.

[0018] Furthermore, the original welding ribbon extends along the X' direction, and is used to weld two adjacent solar cells in a solar cell string after the extending direction of the welding ribbon is rotated to the Y direction, wherein the X' direction intersects with the Y direction.

[0019] Furthermore, the X' direction is perpendicular or substantially perpendicular to the Y direction.

[0020] Furthermore, the lengths of each of the welding strips are equal, or the lengths of at least two of the welding strips are unequal.

[0021] In another aspect, the present invention provides a welding strip preparation device, the welding strip preparation device comprising:

[0022] A welding ribbon winding mechanism, on which the welding ribbon strip is wound;

[0023] A strip pulling mechanism, used for pulling out the welding strip from the welding strip winding mechanism;

[0024] A cutting mechanism, which is used to cut the welding strip material to obtain an original welding strip extending along the X' direction, and cut the original welding strip into m welding strips, m ≥ 2, each of which extends along the X' direction;

[0025] A clamping mechanism, both ends of each welding strip can be clamped by the clamping mechanism;

[0026] A rotating mechanism is connected to the clamping mechanism, and is used to rotate the extending direction of the welding strip to the Y direction for welding two adjacent battery sheets in a solar cell string.

[0027] Furthermore, the clamping mechanism comprises m clamping components arranged along the X' direction, and both ends of each of the welding strips can be clamped by the clamping components.

[0028] Furthermore, the rotating mechanism includes m rotating components respectively connected to the clamping components, and each of the clamping components can rotate under the action of the corresponding rotating component.

[0029] Furthermore, the solder strip preparation device also includes a transfer device, and the transfer device is used to transfer the solder strip extending along the Y direction to a corresponding position of the battery cell along the Y direction.

[0030] Furthermore, the solder strip preparation device includes a plurality of solder strip winding mechanisms, the strip pulling mechanism is used to simultaneously pull out a plurality of the original solder strips from the plurality of solder strip winding mechanisms, the cutting mechanism is used to simultaneously cut a plurality of the original solder strips, the clamping mechanism includes m clamping assemblies arranged along a first direction, each of the clamping assemblies includes a plurality of clamping units arranged along a second direction, each of the clamping units is used to clamp both ends of a solder strip, and the first direction is perpendicular or approximately perpendicular to the second direction.

[0031] The beneficial effect of the present invention is that the feeding of welding wires for multiple parallel battery cells can be completed by using a set of feeding equipment.

[0032] Compared with the prior art, the solder strip preparation method and device provided by the present invention do not require multiple sets of solder strip preparation devices to simultaneously supply materials for the production of multiple parallel battery strings, which greatly reduces the cost and floor space, and can greatly reduce the manpower and time costs of subsequent use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional schematic diagram of the welding strip preparation device in the present invention Figure 1 ;

[0034] Figure 2 A partial three-dimensional schematic diagram of the welding strip preparation device in the present invention Figure 1 ;

[0035] Figure 3 A three-dimensional schematic diagram of the welding strip preparation device in the present invention Figure 2 ;

[0036] Figure 4 It is a front view schematic diagram of the welding strip preparation device in the present invention;

[0037] Figure 5 It is a top view schematic diagram of the welding strip preparation device in the present invention;

[0038] Figure 6 It is a side view schematic diagram of the welding strip preparation device in the present invention;

[0039] Figure 7 A partial three-dimensional schematic diagram of the welding strip preparation device in the present invention Figure 2 ;

[0040] Figure 8 It is a partial top view schematic diagram of the welding strip preparation device in the present invention;

[0041] Fig. 9 It is a partial front view schematic diagram of the welding strip preparation device in the present invention;

[0042] Fig.10 It is a partial side view schematic diagram of the welding strip preparation device in the present invention;

[0043] Attached Fig.11 It is a schematic diagram of preparing an original welding strip in the welding strip preparation method of the present invention;

[0044] Attached Fig.12 for Fig.11 A schematic side view of the middle battery cell;

[0045] Attached Fig.13 It is a schematic diagram of cutting the original welding strip in the welding strip preparation method in this embodiment;

[0046] Attached Fig.14 It is a schematic diagram of moving the soldering strip in the soldering strip preparation method in this embodiment;

[0047] Attached Fig.15 It is a schematic diagram of rotating the welding strip in the welding strip preparation method in this embodiment;

[0048] Attached Fig.16 It is a first schematic diagram of preparing a battery string in the method for preparing a welding strip in this embodiment;

[0049] Attached Fig.17 for Fig.16A schematic side view of the middle battery cell and the solder ribbon assembly;

[0050] Attached Fig.18 It is a first schematic diagram of preparing a battery string in the method for preparing a welding strip in this embodiment;

[0051] Attached Fig.19 for Fig.18 A schematic side view of a middle battery string;

[0052] Attached Fig. 20 is a partial schematic diagram of a battery string in this embodiment;

[0053] Attached Fig.21 for Fig. 20 A schematic side view of a middle battery string;

[0054] Attached Fig. 22 is a schematic diagram of the structure of a single battery cell in this embodiment;

[0055] Attached Fig.23 It is a structural schematic diagram of a welding strip feeding mechanism in the prior art.

[0056] Figure markings: 1-battery cell, 10-battery string, 11-grid bar, 20-welding strip group, 21-original welding strip, 211-welding strip, 2-rotating assembly, 3-clamping assembly, 31-first clamping jaw, 32-second clamping jaw, 33-first track, 34-second track, 35-clamping cylinder, 41-Y-axis moving axis, 42-X-axis moving axis, 43-Z-axis moving axis,.

[0057] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0058] The present invention can be further understood by the specific examples of the present invention given below, but they are not intended to limit the present invention.

[0059] Embodiment 1

[0060] The present embodiment provides a welding tape preparation device, which includes a welding tape winding mechanism, a pulling mechanism, a clamping mechanism, a cutting mechanism and a rotating mechanism. The welding tape winding mechanism has a rotatable shaft, and the welding tape strip is wound on the shaft of the welding tape winding mechanism. The pulling mechanism pulls one end of the welding tape strip to pull the welding tape strip out of the welding tape winding mechanism along the X direction. When the weight of the welding tape strip and the welding tape winding mechanism is large, the welding tape strip pulled out by the pulling mechanism is relatively tight.

[0061] The cutting mechanism is used to cut the welding tape strip, so that a section of welding tape strip pulled out by the pulling mechanism is separated from the strip wound on the welding tape winding mechanism, and the cut welding tape strip is the original welding tape 21 extending along the X direction, and the original welding tape 21 is continued to be cut to obtain a plurality of welding tapes 211 extending along the X direction. The clamping mechanism includes a plurality of clamping assemblies 3 arranged along the X direction, and the clamping assemblies 3 can clamp the two ends of the original welding tape or the welding tape 211, so that the position of the welding tape 211 is relatively fixed, will not deviate from its position, and can keep the welding tape 211 in a taut state. The rotating mechanism is connected to the clamping mechanism, and is used to rotate the extension direction of the welding tape 211 to the Y direction, which is also the extension direction of the solar cell string after welding, so that the welding tape 211 can be used to weld two adjacent cells in the solar cell string. The cutting method includes but is not limited to mechanical cutting, laser cutting, etc. It should be noted that the X direction intersects with the Y direction. Preferably, the X direction is perpendicular or approximately perpendicular to the Y direction, and both extend in the horizontal direction.

[0062] The number of the clamping components 3 is m, m ≥ 2, and when the cutting mechanism cuts the welding strip 211, the number of segments cut is not greater than m. The rotating mechanism includes m rotating components 2, and the rotating components 2 correspond to the clamping components 3 one by one. Each clamping component 3 can rotate under the action of the corresponding rotating component 2. Since the purpose is to rotate the welding strip 211 extending along the X direction to extend along the Y direction, the rotation angle of the clamping component 3 can be set according to the angle between the X direction and the Y direction.

[0063] See also Figures 1 to 10 The welding strip preparation device of this embodiment includes an X-axis moving axis 42, a Y-axis moving axis 41, and a Z-axis moving axis 43. The X-axis, Y-axis, and Z-axis are not coplanar; the three directions can be perpendicular to each other. The clamping assembly 3 is arranged below the rotating assembly 2. The rotating assembly 2 is connected to the X-axis moving axis 42 through a mover and can move along the X-axis moving axis 42. The X-axis moving axis 42 can move along the Z-axis moving axis 43. The Z-axis moving axis 43 can move along the Y-axis moving axis 41. Since the directions of the three moving axes are not coplanar, the rotating mechanism 2 and the clamping assembly 3 can reach every position in the space range opened by the three moving axes.

[0064] Since the m groups of welding strips 20 extending in the X direction obtained directly after cutting and rotating may not completely correspond to the positions of the m battery cells arranged in the X direction, the welding strip preparation device also includes a transfer device for transferring the welding strip 211 extending in the Y direction along the Y-direction moving axis 41 and lowering the welding strip 211 along the Z-direction moving axis 43, so as to place the welding strip 211 at the corresponding position of the battery cell, so as to facilitate the next step of welding the welding strip 211 and the battery cell. Generally, the corresponding position of the battery cell refers to the grid line of the battery cell.

[0065] In some embodiments, the welding tape preparation device includes multiple welding tape winding mechanisms. In other words, one welding tape feeding mechanism includes multiple welding tape winding mechanisms. The pulling mechanism simultaneously pulls out multiple original welding tapes from multiple welding tape winding mechanisms, and the cutting mechanism simultaneously cuts the multiple original welding tapes to obtain a welding tape array arranged along the X direction. Subsequently, the rotating mechanism rotates all the welding tapes 211 in the welding tape array to extend along the Y direction. Let's assume that the number of welding tape winding mechanisms is n. Then, after the cutting is completed, at most n*m welding tapes 211 can be obtained, and these welding tapes form an n*m welding tape array, and the welding tape array includes m welding tape groups 20.

[0066] The clamping mechanism includes m clamping assemblies 3 arranged along the first direction, each clamping assembly 3 includes a plurality of clamping units arranged along the second direction, each clamping assembly 3 may include n clamping units, each clamping unit is used to clamp the two ends of a welding strip 211, and when the clamping assembly 3 is in the original state, the first direction is perpendicular or approximately perpendicular to the second direction. That is, each clamping assembly 3 can clamp n parallel welding strips at the same time. When the rotating mechanism rotates the welding strip 211, the multiple welding strips 211 clamped by the same clamping assembly 3 share the same rotation axis, and the rotation axis is extended along the Z direction. After the rotation is completed, all welding strips 211 form a 1*(n*m) array, and the second direction is rotated to be parallel to the first direction.

[0067] The number of clamping units should be greater than or equal to the number of welding strip winding mechanisms. In the case of fewer welding strip winding mechanisms, some clamping units are unloaded.

[0068] See also Figure 2 , Figure 7 to Figure 10 , the clamping assembly 3 is arranged below the rotating assembly 2. The clamping assembly 3 includes a plurality of first clamps 31 and an equal number of second clamps 32, and a first clamp 31 and a corresponding second clamp 32 constitute a clamping unit. The first clamp 31 is arranged on a first track 33, and the second clamp 32 is arranged on a second track 34, and the first track 33 and the second track 34 are perpendicular to each other. Under the control of the clamping cylinder 35, the first clamp 31 and the second clamp 32 move along the first track 33 and the second track 34 respectively, approaching each other to clamp and fix the welding strip 211, or moving away from each other to release the welding strip 211. The cutting mechanism can be integrated on the clamping assembly 3 to facilitate cutting of the original welding strip. The m rotating assemblies 2 are independent of each other and can be set to rotate separately or simultaneously according to actual needs.

[0069] Figure 1 and Figure 2 Corresponding to the state of the welding strip preparation device before the welding strip 211 is rotated, Figures 3 to 10This corresponds to the state of the solder ribbon preparation apparatus after the solder ribbon 211 is rotated. Figure 1 In the embodiment, a plurality of clamping components 3 are relatively close to each other; Figure 3 to Figure 6 In the embodiment, the plurality of clamping assemblies 3 are relatively far away from each other under the action of the transfer device, and are dispersedly distributed along the X-axis, so as to prepare for placing the soldering ribbon 211 at the corresponding position of the solar cell in the next step. In addition, the transfer device disperses the clamping assemblies 3 in the X-direction before the rotation, and can also avoid mutual interference between the plurality of clamping assemblies 3 during the rotation process, thereby ensuring smooth operation of the equipment.

[0070] After placing the soldering tape, the transfer device and the rotating mechanism can return the unloaded clamping assembly 3 to its original position, so that the clamping assembly 3 returns to the position corresponding to the soldering tape strip pulled out from the soldering tape winding mechanism, and then the next round of operation is carried out.

[0071] Embodiment 2

[0072] See also Figure 11 to Figure 22 This embodiment provides a method for preparing a solder strip, comprising the following steps:

[0073] Pull out the welding ribbon strip wound on the welding ribbon winding mechanism so that the pulled out welding ribbon strip extends along the X direction;

[0074] See also Fig.11 , shaping the pulled-out welding strip, and then cutting the shaped welding strip so as to separate it from the welding strip winding mechanism, to obtain the original welding strip 21 extending along the X direction;

[0075] Fixing the two ends of the original welding belt 21 and shaping the original welding belt 21;

[0076] See also Fig.13 , cutting one or more original welding strips 21 extending along the X direction into m welding strips 211, m≥2, each welding strip 211 extending along the X direction;

[0077] See also Fig.15 The extending direction of the welding ribbon 211 is rotated to the Y direction and then used to weld two adjacent solar cells 1 in the solar cell string, wherein the X direction intersects the Y direction. Fig.14 In order to facilitate the placement of the welding tape 211 on the corresponding battery cell 1, the multiple welding tape groups 20 are moved away from each other before rotating the welding tape 211. Alternatively, the welding tape 211 may be rotated first, and then the multiple welding tape groups 20 are moved away from each other.

[0078] Shaping refers to using a movable clamping mechanism to clamp the two ends of the welding ribbon (or the original welding ribbon, welding ribbon strip material) and straighten the welding ribbon 211 so that the welding ribbon 211 will not be skewed or deviate from the position due to the force of the cutting mechanism when being cut, which will affect the cutting effect. Therefore, the action of fixing the two ends of the welding ribbon should be performed earlier than the cutting action or at the same time. The cutting method includes but is not limited to mechanical cutting, laser cutting, etc.

[0079] Depending on the requirements, the lengths of the welding strips 211 may be equal or unequal. By adjusting the positions of the clamping mechanism and the cutting mechanism, welding strips 211 of corresponding lengths may be obtained.

[0080] The method for preparing the solder strip of this embodiment can be used to prepare m groups of solar cell strings at the same time. Fig. 22 As shown, each cell 1 is provided with m grid bars 11 on both sides, m≥1, and m=12 here. The grid bars 11 are specifically long strip-shaped grooves for the welding strips 211 to be embedded. On the same side of the cell 1, the extension directions of the m grid bars 11 are parallel to each other, and the grid bars 11 on the front and back sides of the cell 1 correspond to each other in the thickness direction of the cell 1. In the above-mentioned battery string 10, the grid bars 11 on each cell 1 extend along the Y direction, so that they can correspond one-to-one with the welding strips 211 that also extend along the Y direction.

[0081] Figure 11 to Figure 21 This is a schematic diagram of the process of producing a solar cell string in this embodiment. For the sake of simplicity, only m=3 solar cells 1 are illustrated here, but it should be understood that any value of m will not affect the basic principle of this method.

[0082] See also Figure 16 to Figure 21 , m solar cells are arranged along a direction perpendicular to the Y direction, the welding ribbon 211 extending along the Y direction prepared in this embodiment is placed at the corresponding position of the solar cell, a part of the welding ribbon 211 is located on the solar cell, and another part of the welding ribbon 211 exceeds the edge of the solar cell and extends along the Y direction, a new solar cell is pressed on the part of the welding ribbon 211 exceeding the original solar cell; and a batch of new welding ribbons 211 are placed at the corresponding positions of the new solar cells, and this is repeated to obtain m groups of solar cell strings 10 extending along the Y direction.

[0083] In some embodiments, the extension direction X' of the original welding ribbon 21 is parallel to the arrangement direction of the m solar cells X, that is, both are perpendicular to the Y direction. Therefore, in the first and second embodiments, the X' direction is parallel to the X direction. In some scenarios limited by the space of the factory, the extension direction X' of the original welding strip 21 can be set to a direction that is not perpendicular to the Y direction. At this time, the extension direction of the original welding strip 21 intersects with the X direction, and the feeding direction is no longer along the Y direction. The feeding path is an arc path. When the original welding strip 21 is cut, the arrangement direction of the clamping assembly 3 is consistent with the extension direction of the original welding strip 21, both of which are X'. After cutting to obtain the welding strip 211 (at this time, the extension direction of the welding strip 211 is X'), all the clamping mechanisms and the rotating mechanisms are transferred synchronously as a whole, so that the clamping assembly 3 is arranged along the X direction. At this time, the extension direction of the welding strip 211 is X, and then the rotating assembly 2 rotates the clamping assembly 3 again, so that the extension direction of the welding strip 211 clamped by the clamping assembly 3 is changed to Y, so as to facilitate the transfer of the welding strip 211 to the battery cell 1. Alternatively, the welding strip 211 is first transported to the top of the battery cell 1, and then the welding strip 211 is rotated so that the extension direction of the welding strip 211 is parallel to the extension direction of the grid bar of the battery cell 1.

[0084] Compared with the prior art, the solder strip preparation method and device provided in this embodiment do not require multiple sets of solder strip preparation devices. One set of feeding equipment can simultaneously feed materials for the production of multiple parallel battery strings, which greatly reduces the cost and floor space, and can greatly reduce the manpower and time costs of subsequent use and maintenance.

[0085] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A method for preparing a welding strip, characterized in that: The steps include: Pulling out a plurality of parallel original welding strips (21) from n welding strip winding mechanisms; Cutting each original welding strip (21) extending along the X' direction into m welding strips (211), where m≥2, and each welding strip (211) extending along the X' direction to obtain n×m welding strips (211); The m rows of welding strips (211) are rotated respectively, so that the extending direction of the welding strips (211) is rotated to the Y direction and then used to weld two adjacent solar cells (1) in a solar cell string, so as to simultaneously prepare m groups of solar cell strings: the m solar cells are arranged in a direction perpendicular to the Y direction, and n grid bars are respectively arranged on the front and back sides of each solar cell, and the grid bars are in the shape of long strips for the welding strips to be embedded; The n parallel welding strips (211) in each column correspond one-to-one to the n grid bars on the front side of each solar cell, a portion of the welding strip (211) is located on the solar cell, and another portion exceeds the edge of the solar cell and extends along the Y direction; Place m new solar cells on the portion of the welding strip (211) that exceeds the original solar cell; then place a batch of new welding strips (211) on the new solar cells, and repeat this process to obtain m groups of solar cell strings extending along the Y direction.

2. The method for preparing a welding strip according to claim 1, characterized in that: Where the X' direction intersects the Y direction.

3. A method for preparing a welding ribbon, wherein the welding ribbon is used for welding cells in a solar cell string, characterized in that: The steps include: Pulling out the welding tape material wound on the welding tape winding mechanism, shaping it and then cutting it to obtain the original welding tape (21); After cutting n parallel original welding strips (21) extending along the X' direction, n×m welding strips (211) are obtained, where m≥2, and both ends of each welding strip (211) are fixed, and each welding strip (211) extends along the X' direction; m rows of welding strips (211) are rotated respectively, so that the extending direction of the welding strips (211) is rotated to the Y direction and then used to weld two adjacent solar cells (1) in a solar cell string, wherein the X' direction intersects the Y direction, so as to simultaneously prepare m groups of solar cell strings: the m solar cells are arranged along a direction perpendicular to the Y direction, and n grid bars are respectively arranged on the front and back sides of each solar cell, and the grid bars are long strips for the welding strips to be embedded; The n parallel welding strips (211) in each column correspond one-to-one to the n grid bars on the front side of each solar cell, a portion of the welding strip (211) is located on the solar cell, and another portion exceeds the edge of the solar cell and extends along the Y direction; Place m new solar cells on the portion of the welding strip (211) that exceeds the original solar cell; then place a batch of new welding strips (211) on the new solar cells, and repeat this process to obtain m groups of solar cell strings extending along the Y direction.

4. The method for preparing a welding strip according to claim 3, characterized in that: The X' direction is perpendicular to the Y direction.

5. The method for preparing a welding strip according to any one of claims 1 to 4, characterized in that: The length of each welding strip (211) is equal, or, The lengths of at least two of the welding strips (211) are unequal.

6. A welding strip preparation device, characterized in that: Used to prepare m groups of solar cell strings at the same time, the m solar cell sheets are arranged along a direction perpendicular to the Y direction, and n grid bars are respectively provided on the front and back sides of each solar cell, and the grid bars are long strips for embedding welding strips; The welding strip preparation device comprises: A welding tape winding mechanism, on which the welding tape strip is wound; A strip pulling mechanism, used for pulling out the welding strip from the welding strip winding mechanism; A cutting mechanism, which is used to cut the welding strip material to obtain an original welding strip (21) extending along the X' direction, and to cut the original welding strip (21) into m welding strips (211), m≥2, and each welding strip (211) extends along the X' direction; A clamping mechanism, comprising m clamping assemblies (3) arranged in an X' direction, each clamping assembly (3) being provided with n parallel clamping units for simultaneously clamping n mutually parallel welding strips (211), and both ends of each welding strip (211) can be clamped by the clamping units of the clamping assembly (3); A rotating mechanism connected to the clamping mechanism, the rotating mechanism being used to rotate the extension direction of the welding strip (211) clamped by the clamping unit to the Y direction; The m clamping assemblies (3) correspond to the m solar cells one by one, the n welding strips (211) clamped by the n parallel clamping units on each clamping assembly (3) correspond to the n grid bars on the front of each solar cell one by one, a portion of the welding strips (211) is located on the solar cell, and another portion exceeds the edge of the solar cell and extends along the Y direction; the m new solar cells are placed on the portion of the welding strips (211) that exceeds the original solar cells; and a batch of new welding strips (211) are placed on the new solar cells, and this is repeated to obtain m groups of solar cell strings extending along the Y direction.

7. The welding strip preparation device according to claim 6, characterized in that: The rotating mechanism comprises m rotating assemblies (2) respectively connected to the clamping assemblies, and each of the clamping assemblies (3) can rotate under the action of the corresponding rotating assembly (2).

8. The welding strip preparation device according to claim 6, characterized in that: The welding strip preparation device also includes a transfer device, and the transfer device is used to transfer the welding strip (211) extending along the Y direction to a corresponding position of the battery cell along the Y direction.

9. The welding strip preparation device according to claim 6, characterized in that: The welding tape preparation device comprises a plurality of welding tape winding mechanisms, the strip pulling mechanism is used to simultaneously pull out a plurality of original welding tapes (21) from the plurality of welding tape winding mechanisms, the cutting mechanism is used to simultaneously cut a plurality of original welding tapes (21), the clamping mechanism comprises m clamping assemblies (3) arranged along a first direction, each of the clamping assemblies (3) respectively comprising a plurality of clamping units arranged along a second direction, each of the clamping units being used to clamp two ends of a welding tape (211), and the first direction is perpendicular to the second direction.

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