Specially designed tape for connecting back contact cells

Abstract

A specially designed band for connecting back-contact cells, the band comprising: a body; and a multitude of first solder joints and a multitude of second solder joints, each arranged on two sides of the body in a width direction, wherein Each of the first solder joints extends from a first side of the body outwards; Each of the second solder joints extends outwards from a second side of the body; and a shape of each first solder joint differs from a shape of each second solder joint; and / or center lines of the plurality of first solder joints and the plurality of second solder joints that are adjacent to each other are offset from each other in the width direction of the body.

Description

BACKGROUND

[0001] This application pertains to the technical field of solar cells, and in particular to a specially designed tape for connecting back-contact cells.

[0002] A solar cell generates electricity by converting sunlight into electrical energy through a photovoltaic effect of a semiconductor pn junction, representing a sustainable source of clean energy.

[0003] Conventionally, a large number of solar cells are connected as a whole using a tape and then packaged into a cell module using processes such as laying, lamination, and the like. However, due to thermal mismatch between the tape and the solar cells—that is, different proportional coefficients of thermal expansion and contraction during temperature fluctuations—the solar cells and tapes can be forced into cracks and fragments because the stress between the solar cells and the tape is too great to dissipate. Thermal expansion and contraction of the tape can also subject the cells to tensile stress on the tape, leading to cracking and fragmentation of the solar cells.

[0004] Based on this, the problem to be solved is how to design a band to minimize damage to the solar cells caused by voltage.

[0005] This application provides a specially designed tape for connecting back-contact cells to solve the problem of how to design a tape to minimize damage to solar cells caused by voltage.

[0006] According to a first aspect, a specially designed band for connecting back-contact cells provided in this application comprises: a body; and a multitude of first solder joints and a multitude of second solder joints, each arranged on two sides of the body in a width direction, wherein Each of the first solder joints extends from a first side of the body outwards; Each of the second solder joints extends outwards from a second side of the body; and a shape of each first solder joint differs from a shape of each second solder joint; and / or center lines of at least one set of the first and second solder joints that are adjacent to each other are offset from each other in the width direction of the body.

[0007] Optionally, the body includes a multitude of slots, and one end of each slot forms an opening in the body.

[0008] Optionally, each first solder joint corresponds to a set of slots, and a slot in the set of slots located further away from the corresponding first solder joint in a longitudinal direction is located further away from the corresponding first solder joint in the transverse direction; and / or Every second solder joint corresponds to a set of slots, and a slot in the set of slots located at a greater distance from the corresponding second solder joint in a longitudinal direction is located at a greater distance from the corresponding second solder joint in the width direction.

[0009] Optionally, the set of slots comprises a first slot, a second slot, a third slot, a fourth slot, and a fifth slot, wherein the first slot is located in the middle of the set of slots, and the second and third slots are each located on opposite sides of the first slot; the fourth slot is located on one side of the second slot facing away from the first slot, and the fifth slot is located on one side of the third slot facing away from the first slot; and The lengths of the set of slots satisfy the following relationship: L1>L2=L3>L4=L5, where

[0010] L1 is the length of the first slot, L2 is the length of the second slot, L3 is the length of the third slot, L4 is the length of the fourth slot, and L5 is the length of the fifth slot.

[0011] Optionally, the specially designed band for connecting back-contact cells connects a first cell to a second cell, and the body includes a first connecting section covering the first cell, a second connecting section covering the second cell, and a third connecting section covering a gap between the first cell and the second cell;

[0012] The dimensions of the specially designed band for connecting back-contact cells satisfy the following relationship: d1 = L2, and / or d1 = L3, where d1 is the width of the first connecting section, L2 is the length of the second slot, and L3 is the length of the third slot.

[0013] Optionally, a distance between two adjacent slots in the set of slots satisfies the following relationship: 0.2 <L1:(S1+S2)<1,5, where L1 is the length of the first slot, S1 is a distance between the first slot and the second slot, and S2 is a distance between the second slot and the fourth slot; and / or 0.2 <L1:(S3+S4)<1,5, where L1 is the length of the first slot, S3 is a distance between the first slot and the third slot, and S4 is a distance between the third slot and the fifth slot.

[0014] Optionally, each first solder point corresponds to a set of slots, and a slot in the set of slots located at a greater distance from the corresponding first solder point in a longitudinal direction is located at a smaller distance from the corresponding first solder point in the lateral direction; and / or Every second solder joint corresponds to a set of slots, and a slot in the set of slots with a larger distance from the corresponding second solder joint in a longitudinal direction is located at a smaller distance from the corresponding second solder joint in the width direction.

[0015] Optionally, each first solder joint corresponds to a set of slots, and the distances between two adjacent slots in the set of slots are equal; and / or Every second solder joint corresponds to a set of slots, and the distances between any two adjacent slots in the set of slots are equal.

[0016] A multitude of slots are provided, and the directions in which the multitude of slots extend are parallel to the width direction of the body.

[0017] Optionally, the width of each slot can range from 0.2 mm to 0.6 mm.

[0018] Optionally, the distance between two adjacent slots can be from 1.5 mm to 4 mm.

[0019] Optionally, the distance between two adjacent sets of slots can be from 1.5 mm to 15 mm.

[0020] Optionally, the body also includes a contact hole, and another end of the slot is connected to the contact hole.

[0021] Optionally, the first solder points are connected to the first cell, the second solder points are connected to the second cell, the contact hole has an elliptical shape, the length of the short axis of the contact hole is the width of the gap between the first cell and the second cell, and the long axis of the contact hole coincides with a center line of the body.

[0022] Optionally, the contact hole can have an elliptical shape, a circular shape, a semicircular shape, or a rhombic shape.

[0023] Optionally, two adjacent contact holes of a set of contact holes corresponding to each first solder joint are offset from each other in the longitudinal direction.

[0024] Optionally, the body width can range from 2.3 mm to 6 mm.

[0025] Optionally, the distance between the first solder joint and the second solder joint, which lie next to each other in the width direction of the body, is from 5 mm to 15 mm.

[0026] Optionally, the thickness of the specially designed band for connecting back contact cells can range from 0.1 mm to 0.3 mm.

[0027] Optionally, the specially designed band for connecting back-contact cells comprises a copper substrate and a tin layer applied to the copper substrate. Alternatively, the specially designed band for connecting back-contact cells comprises an aluminum substrate and a tin layer applied to the aluminum substrate. Alternatively, the specially designed band for connecting back-contact cells is an aluminum strip. Alternatively, the specially designed band for connecting back-contact cells is a tin strip.

[0028] Optionally, the multitude of first solder joints is arranged equidistantly on the first side of the body in a longitudinal direction; and / or The multitude of second solder joints are arranged equidistantly on the second side of the body in a longitudinal direction of the body.

[0029] Optionally, the body has a rectangular shape. Alternatively, the body has a curved shape, and the numerous first and second solder points are arranged at the curved corners.

[0030] Optionally, each first solder joint has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape or a trapezoidal shape; and / or each second solder joint has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape or a trapezoidal shape.

[0031] Optionally, an enclosed angle of 20° to 60° is formed between a line connecting each first solder joint with each second solder joint closest to the first solder joint and a longitudinal direction of the tape.

[0032] Optionally, the specially designed band for connecting back-contact cells connects a first cell to a second cell, each first solder joint is connected to a positive electrode of the first cell, each second solder joint is connected to a negative electrode of the second cell, and an area of ​​the first solder joint is greater than or equal to an area of ​​the second solder joint; or each first solder joint is connected to a negative electrode of the first cell, each second solder joint is connected to a positive electrode of the second cell, and the area of ​​the second solder joint is greater than or equal to the area of ​​the first solder joint.

[0033] In the specially designed band for connecting back-contact cells according to the embodiments of this application, the plurality of first solder joints and the plurality of second solder joints, each located on two sides of the body, are offset from one another in the width direction of the body, and / or the first solder joints and the second solder joints have different shapes. Therefore, strain stresses caused by the deformation of the specially designed band for connecting back-contact cells can be absorbed more effectively, thereby minimizing damage to the solar cells caused by the stress. Fig. Figure 1 is a schematic diagram of part of a structure of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 2 is a schematic structure diagram of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 3 is a schematic structure diagram of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 4 is a schematic structure diagram of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 5 is a schematic structure diagram of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 6 is a schematic diagram of part of a structure of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 7 is a schematic diagram of part of a structure of a specially designed band for connecting back-contact cells according to an embodiment of this application. Fig. Figure 8 is a schematic diagram of part of a structure of a specially designed band for connecting back-contact cells according to an embodiment of this application.

[0034] To clarify and make more understandable the objectives, technical solutions, and advantages of this application, it is described in detail with reference to the attached drawings and embodiments. It is understood that the specific embodiments described herein serve only to illustrate this application and are not intended to limit it.

[0035] With reference to Fig. 1 and Fig. 2 comprises a specially designed band 10 for connecting back-contact cells according to an embodiment of this application, a body 101, a plurality of first solder joints 11, and a plurality of second solder joints 12. The plurality of first solder joints 11 and the plurality of second solder joints 12 are each located on two sides of the body 101 in a lateral direction. Each of the first solder joints 11 extends outward from a first side of the body 101. Each of the second solder joints 12 extends outward from a second side of the body 101. One shape of each first solder joint 11 differs from one shape of each second solder joint 12. Center lines of at least one set of adjacent first solder joints 11 and second solder joints 12 are offset from each other in the lateral direction of the body 101.

[0036] In the specially designed band 10 for connecting back-contact cells according to the embodiments of this application, the plurality of first solder joints 11 and the plurality of second solder joints 12, each located on two sides of the body 101, are offset from one another in the lateral direction of the body 101, and / or the first solder joints 11 and the second solder joints 12 have different shapes. Therefore, strain stresses caused by the deformation of the specially designed band 10 for connecting back-contact cells can be absorbed more effectively, thereby minimizing damage to the solar cells caused by the stress.

[0037] It is understood that the band 10 absorbs stresses in a longitudinal direction, the width direction and a thickness direction through deformation.

[0038] In particular, in the case of deformation of the band 10, a position that is closer to the first solder joint 11 or the second solder joint 12 is subjected to a greater stress on a line segment formed by connecting the first solder joint 11 with the second solder joint 12 adjacent to each other.

[0039] It can be understood that different shapes or offset center lines of the solder joints on the two sides may result in the specially designed band 10 for connecting back-contact cells being asymmetrical.

[0040] It can be understood that the solder joints on the two sides of the body 101 are offset from each other, so that the body 101 is longer between the solder joints to absorb a stress-deformation quantity, thereby absorbing tensile and torsional deformations more effectively.

[0041] It can be understood that the expression “a shape of each first solder joint 11 differs from a shape of each second solder joint 12, and / or centerlines of at least one set of first solder joints 11 and second solder joints 12 that are adjacent to each other are offset from each other in the width direction of the body 101” encompasses the following three situations: The shape of the first solder joint 11 differs from the shape of the second solder joint 12, and the centerlines of at least one set of first solder joints 11 and second solder joints 12 that are adjacent to each other are offset from each other in the width direction of the body 101. The shape of the first solder joint 11 differs from the shape of the second solder joint 12, and the centerlines of all first solder joints 11 and second solder joints 12 that are adjacent to each other coincide in the width direction of the body 101.The shape of the first solder joint 11 is the same as the shape of the second solder joint 12, and the center lines of at least one set of the first solder joint 11 and the second solder joint 12 that are adjacent to each other are offset from each other in the width direction of the body 101. The last situation is used here as an example for clarification and description, but this does not represent a limitation of the situations above.

[0042] The expression “center lines of at least one set of the first solder joint 11 and the second solder joint 12, which are adjacent to each other, are offset from each other in the width direction of the body 101” can mean that the center lines of a set of the first solder joint 11 and the second solder joint 12, which are adjacent to each other, are offset from each other in the width direction of the body 101, or can mean that the center lines of a plurality of sets of the first solder joint 11 and the second solder joint 12, which are adjacent to each other, are offset from each other in the width direction of the body 101, and the remaining center lines of the first solder joint 11 and the second solder joint 12, which are adjacent to each other, coincide in the width direction of the body 101, or can mean that the center lines of all first solder joints 11 and second solder joints 12, which are adjacent to each other,are offset from each other in the lateral direction of body 101. The last situation is used here as an example for explanation and description, but this does not represent a limitation of the situations mentioned above.

[0043] It can be understood that the expression “offset in the latitudinal direction of the body 101” means not overlapping in the latitudinal direction.

[0044] It can be understood that a center line 111 of the first solder joint is a line that passes through the center of the first solder joint 11 and is parallel to the width direction. A center line 121 of the second solder joint 12 is a line that passes through the center of the second solder joint 12 and is parallel to the width direction.

[0045] Referring to Fig. 2 Optionally, an included angle y of 20° to 60° is formed between a line connecting each first solder joint 11 with each second solder joint 12 nearest to the first solder joint 11 and a longitudinal direction of the strip 10. Therefore, the first solder joint 11 and the second solder joint 12 are offset from each other by a suitable amount, which allows for more effective absorption of the tensile stress through deformation of the strip 10, thereby minimizing damage to the cells caused by the stress.

[0046] In particular, the included angle y is, for example, 21°, 23°, 30°, 32°, 35°, 39°, 40°, 45°, 50°, 55° or 60°.

[0047] Furthermore, 20° < y < 40°. The included angle is, for example, 21°, 23°, 30°, 32°, 35° or 39°.

[0048] Preferably, γ is 23°. In this way, the first solder joint 11 and the second solder joint can be offset from each other by the most suitable amount.

[0049] Referring to Fig. 2. The thickness of the specially designed band 10 for connecting back-contact cells can optionally range from 0.1 mm to 0.3 mm. For example, the thickness may be 0.1 mm, 0.12 mm, 0.14 mm, 0.18 mm, 0.2 mm, 0.21 mm, 0.25 mm, 0.27 mm, or 0.3 mm. Therefore, the thickness of the specially designed band 10 for connecting back-contact cells is within a suitable range to avoid poor strain stress absorption or poor mechanical strength due to excessive thickness, and to prevent relatively high costs due to excessive thickness.

[0050] Preferably, the thickness of the specially designed band 10 for connecting back-contact cells is 0.14 mm. In this way, the strain stress absorption effect, the mechanical strength and the cost of the specially designed band 10 for connecting back-contact cells can all be taken into account, thereby achieving an optimal overall effect.

[0051] Referring to Fig. 2. The specially designed band 10 for connecting back-contact cells optionally includes a copper substrate and a tin layer applied to the copper substrate. In this way, the specially designed band 10 for connecting back-contact cells has better conductivity to achieve the desired effect of electrically connecting the solar cells.

[0052] In particular, the hardness of the specially designed strip 10 for connecting back-contact cells ranges from 40 HV to 60 HV. For example, the hardness is 40 HV, 42 HV, 45 HV, 48 HV, 50 HV, 53 HV, 55 HV, 59 HV, or 60 HV. In this way, the specially designed strip 10 for connecting back-contact cells exhibits a desirable mechanical strength.

[0053] In particular, the uniformity of the tin layer is ±10%. For example, the uniformity is -10%, -8%, -5%, -2%, 0%, 1%, 5%, 7%, or 10%. In this way, the specially designed strip 10 for connecting back-contact cells has a desirable conductivity.

[0054] In particular, the thickness of the tin layer ranges from 6 µm to 10 µm. For example, the thickness is 6 µm, 6.2 µm, 7 µm, 7.5 µm, 8 µm, 9 µm or 10 µm.

[0055] In other embodiments, the specially designed band 10 for connecting back-contact cells can alternatively comprise an aluminum substrate and a tin layer applied to the aluminum substrate. Alternatively, the specially designed band 10 for connecting back-contact cells can be an aluminum strip. Alternatively, the band 10 for connecting the back-contact cells is a tin strip.

[0056] Optionally, the specially designed band 10 for connecting back-contact cells can be extended by 25% or more. For example, the extension can be 25%, 27%, 30%, or 35%.

[0057] Referring to Fig. 2. Optionally, body 101 can have a rectangular shape. In this way, body 101 has a relatively regular shape and is easy to manufacture.

[0058] Referring to Fig. 3. Optionally, the body 101 can have a curved shape. The first solder point 11 and the second solder point 12 are located at curved corners. This curved shape reduces the stress on the solar cells, thus minimizing damage to them. Furthermore, the curved corners facilitate the positioning of the first and second solder points 12, increasing manufacturing efficiency. The curved corners are also obtuse-angled. This ensures that each curved corner has a relatively large angle, further reducing stress on the solar cells. Each curved corner is equipped with either a first solder point 11 or a second solder point 12.

[0059] It can be understood that in other embodiments, the body 101 may alternately have a rectangular shape and a curved shape, or other shapes as well. In other embodiments, the curved corner may be an acute angle, a right angle, or an arcuate angle, or there may be at least two of the acute angle, the right angle, the obtuse angle, or the arcuate angle. In other embodiments, some of the curved corners may be provided with the first solder point 11 or the second solder point 12, and the remaining curved corners may not be provided with the first solder point 11 and the second solder point 12.

[0060] Referring to Fig. 2. The width w0 of the body 101 can optionally range from 2.3 mm to 6 mm. For example, the width may be 2.3 mm, 2.4 mm, 2.8 mm, 3 mm, 3.35 mm, 3.5 mm, 4 mm, 4.6 mm, 5 mm, 5.8 mm, or 6 mm. This ensures that the width w0 of the body 101 is within a suitable range to avoid poor strain stress absorption of the specially designed band 10 for connecting back-contact cells, or the inability of the specially designed band 10 for connecting back-contact cells to be connected to the solar cells due to an excessively small width w0 of the body 101. It also avoids relatively high costs for the specially designed band 10 for connecting back-contact cells due to an excessively large width w0 of the body 101. A tolerance for the width w0 of the body 101 can be ±0.1 mm.

[0061] Preferably, the width w0 of the body 101 is 3.35 mm. In this way, the strain stress absorption effect, the connection to the solar cells and the cost of the specially designed band 10 for connecting back-contact cells can be taken into account, thereby achieving an optimal overall effect.

[0062] Referring to Fig. 2. The length L0 of body 101 can optionally be from 170 mm to 220 mm. For example, the length could be 170 mm, 176 mm, 180 mm, 182 mm, 210 mm, 218 mm, or 220 mm. The tolerance for the length L0 of body 101 can be ±0.1 mm.

[0063] Preferably the length L0 of the body is 101176 mm.

[0064] Referring to Fig. 2. Optionally, each first solder joint 11 extends from a first side of the body 101 outwards in the width direction of the body 101. Each second solder joint 12 extends from the second side of the body 101 outwards in the width direction of the body 101. In this way, the first solder joint 11 and the second solder joint 12 are regularly arranged, which is practical for manufacturing.

[0065] It can be understood that in other embodiments, a direction in which each first solder joint 11 extends outwards from the side of the body 101 may be at an acute or obtuse angle to the width direction of the body 101. Some of the first solder joints 11 extend outwards from the side of the body 101 in the width direction of the body 101, and a direction in which the remaining first solder joints 11 extend outwards from the side of the body 101 is at an acute or obtuse angle to the width direction of the body 101. A direction in which each second solder joint 12 extends outwards from the side of the body 101 may be at an acute or obtuse angle to the width direction of the body 101.Some of the second solder joints 12 extend outwards from the side of the body 101 in the width direction of the body 101, and one direction in which the remaining second solder joints 12 extend outwards from the side of the body 101 is an acute angle or an obtuse angle to the width direction of the body 101. In particular, if the direction in which the plurality of first solder joints 11 extend outwards is at an acute angle or an obtuse angle to the width direction of the body 101, corresponding angles formed by the plurality of first solder joints 11 may be the same or different. If the direction in which the plurality of second solder joints 12 extend outwards is at an acute or obtuse angle to the width direction of the body 101, corresponding angles formed by the plurality of second solder joints 12 may be the same or different.

[0066] Referring to Fig. Optionally, a plurality of first solder joints 11 are arranged equidistantly on a first side of the body 101 along its longitudinal axis. Optionally, a plurality of second solder joints 12 are arranged equidistantly on the second side of the body 101 along its longitudinal axis. In this way, the body 101 has the same capacity to absorb strain stress between the first solder joint 11 and the second solder joint 12 on each segment, which is advantageous for further minimizing damage to the solar cells. Furthermore, the arrangement of the solder joints is relatively regular, which is beneficial for manufacturing and ensures that the centerlines of adjacent solder joints are offset from one another.

[0067] In other embodiments, the distance between two adjacent first solder joints 11 can be different. The distances between some of the two adjacent first solder joints 11 can be the same, and the distances between the remaining two adjacent first solder joints 11 can be different. Similarly, the distance between two adjacent second solder joints 12 can be different. The distances between some of the two adjacent second solder joints 12 can be the same, and the distances between the remaining two adjacent second solder joints 12 can be different. The specific arrangement of the solder joints is not limited here.

[0068] Referring to Fig. 2. The distance S0 between the first solder joint 11 and the second solder joint 12, which are adjacent in the width direction of the body 101, can be from 5 mm to 15 mm. For example, the distance may be 5 mm, 5.5 mm, 8 mm, 10 mm, 11.375 mm, 13 mm, or 15 mm. In this way, S0 can be positioned within a suitable range to avoid poor deformability and poor strain stress absorption caused by an excessively large or small S0, thus minimizing stress damage to the solar cells. The tolerance of the distance S0 can be ±0.02.

[0069] Preferably, the distance S0 between the first solder joint 11 and the second solder joint 12 adjacent to each other in the width direction of the body 101 is 11.375 mm. In this way, an optimal effect for reducing damage to the solar cells caused by the voltage can be achieved.

[0070] Optionally, the first solder point 11 has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoidal shape. The second solder point 12 optionally has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoidal shape.

[0071] In particular, in an example of Fig. 2. The plurality of first solder joints 11 and the plurality of second solder joints 12 all have a rounded rectangular shape. Furthermore, the radius of a chamfer is from 0.2 mm to 0.4 mm. The radius is, for example, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.31 mm, 0.35 mm, 0.39 mm, or 0.4 mm. Preferably, the radius of the chamfer is 0.3 mm.

[0072] It can be understood that in other examples, the first solder joint 11 and the second solder joint 12 can also have different shapes. Some of the first solder joints 11 can have the same shape but differ from the other first solder joints 11, or all first solder joints 11 can have different shapes. Some of the second solder joints 12 can have the same shape but differ from the other second solder joints 12, or all second solder joints 12 can have different shapes.

[0073] Optionally, the length of the first solder joint 11 extending from the body 101 can be from 1.5 mm to 1.7 mm. For example, the length may be 1.5 mm, 1.52 mm, 1.55 mm, 1.6 mm, 1.63 mm, 1.65 mm, 1.68 mm, or 1.7 mm. The tolerance for the length of the first solder joint 11 extending from the body 101 is ±0.05 mm. Preferably, the length of the first solder joint 11 extending from the body 101 is 1.6 mm.

[0074] Optionally, the width of the first solder joint 11 can be from 2.4 mm to 2.6 mm. For example, the width could be 2.4 mm, 2.42 mm, 2.45 mm, 2.5 mm, 2.53 mm, 2.55 mm, 2.58 mm, or 2.6 mm. The tolerance for the width of the first solder joint 11 is ±0.05 mm. Preferably, the width of the first solder joint 11 is 2.5 mm.

[0075] Optionally, the length of the second solder joint 12 extending from the body 101 is from 0.8 mm to 1.1 mm. For example, the length may be 0.8 mm, 0.82 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, or 1.1 mm. The tolerance for the length of the first solder joint 11 extending from the body 101 is ±0.05 mm. Preferably, the length of the first solder joint 11 extending from the body 101 is 0.95 mm.

[0076] Optionally, the width of the second solder joint 12 can be between 2.4 mm and 2.6 mm. For example, the width could be 2.4 mm, 2.42 mm, 2.45 mm, 2.5 mm, 2.53 mm, 2.55 mm, 2.58 mm, or 2.6 mm. The tolerance for the width of the second solder joint 12 is ±0.05 mm. Preferably, the width of the first solder joint 11 is 2.5 mm.

[0077] Referring to Fig. 4 and Fig. 5 The body 101 optionally includes a plurality of slots 13. One end of each of the slots 13 forms an opening in the body 101. Since the body 101 is provided with the slots 13 and the end of each slot 13 forms the opening in the body 101, the deformation of the specially designed band 10 for connecting back-contact cells can be absorbed by the slots 13 in order to minimize damage to the solar cells caused by the voltage.

[0078] It can be understood that the slots 13 contract or expand when the specially designed band 10 for connecting back contact cells is subjected to a tension, so that the strain stress can be better absorbed by the deformation of the slots 13.

[0079] It can be understood that the slot 13 is long and narrow, one end and another end of the slot 13 are two ends of the slot 13 in a longitudinal direction.

[0080] In particular, in the examples of Fig. 4 and Fig. In example 5, slot 13 has a rectangular shape. This gives slot 13 a relatively regular shape and makes it easy to manufacture. It can be understood that in other examples, slot 13 could also have an oval shape, a linear shape, or another irregular shape.

[0081] If the slot 13 has a rectangular shape and the longitudinal direction of the slot 13 coincides with the width direction of the body 101, then the length of the slot 13 is a dimension of the slot 13 in the width direction of the body 101. The width of the slot 13 is a dimension of the slot 13 in the longitudinal direction of the body 101.

[0082] In particular, in the examples of Fig. 4 and Fig. Figure 5 provides a plurality of slots 13. Therefore, the capacity of the specially designed band 10 for connecting back-contact cells to absorb strain stress is increased by the use of a plurality of slots 13, thereby further reducing damage to the solar cells caused by the stress. It can be assumed that in other embodiments the number of slots 13 may be one.

[0083] In particular, in the examples of Fig. 4 and Fig. 5. Openings of the slots 13 are formed on two sides of the body 101 in the lateral direction. In this way, the deformation circumference of the body 101 can be increased by the deformation of the slots 13 on both sides in the lateral direction, so that the capacity of the specially designed band 10 for connecting back-contact cells to absorb the strain stress is increased, thereby further reducing damage to the solar cells caused by the stress. It can be understood that in other embodiments the opening of the slot 13 may also be formed only on a first side of the body 101 in the lateral direction or on one or both sides of the body 101 in the longitudinal direction.

[0084] Referring to Fig. 4. Optionally, each first solder point 11 corresponds to a set of slots 13. A slot in the set of slots 13 that is located further away from the corresponding first solder point 11 in the longitudinal direction also has a greater distance from the corresponding first solder point 11 in the lateral direction. Optionally, each second solder point 12 corresponds to a set of slots 13. A slot in the set of slots 13 that is located further away from the corresponding second solder point 12 in the longitudinal direction also has a greater distance from the corresponding second solder point 12 in the lateral direction. In this way, current can be transmitted more effectively through the specially designed band 10 for connecting back-contact cells, and the specially designed band 10 for connecting back-contact cells has a better effect at absorbing the voltage.

[0085] In particular, the number of slots 13 in the set of slots 13 corresponding to the first solder point 11 is 5, and the number of slots 13 in the set of slots 13 corresponding to the second solder point 12 is 5.

[0086] It can be understood that in other embodiments, the number of slots 13 in the set of slots 13 corresponding to the first solder point 11 may alternatively differ from the number of slots 13 in the set of slots 13 corresponding to the second solder point 12. The number of slots 13 in the set of slots 13 corresponding to the first solder point 11 may be 2, 3, 4, 6, or more. The number of slots 13 in the set of slots 13 corresponding to the second solder point 12 may be 2, 3, 4, 6, or more.

[0087] It can be understood that in other embodiments, each first solder joint 11 can alternatively correspond to the set of slots 13. A slot in the set of slots 13 that has a greater longitudinal distance from the corresponding first solder joint 11 has a smaller lateral distance from the corresponding first solder joint 11. In other embodiments, each second solder joint 12 can alternatively correspond to the set of slots 13. A slot in the set of slots 13 that has a greater longitudinal distance from the corresponding second solder joint 12 has a smaller lateral distance from the corresponding second solder joint 12. In this way, current can also be transmitted more effectively through the specially designed band 10 for connecting back-contact cells, and the specially designed band 10 for connecting back-contact cells has a better effect in absorbing the voltage.

[0088] Referring to Fig. 4. Optionally, if the number of slots 13 in the set of slots 13 corresponding to the first solder joint 11 is odd, the set of slots 13 is symmetrical about a center line of the middle slot 13. In this way, the symmetrical arrangement of the set of slots 13 is advantageous for manufacturing, and the tensile stress can be absorbed more effectively by the deformation of the specially designed band 10 for connecting back-contact cells.

[0089] It should be noted that the center line of slot 13 is a line that passes through the center of slot 13 and is parallel to the width direction.

[0090] Furthermore, the center line of the middle slot 13 coincides with the center line 111 of the corresponding first solder joint. In this way, the middle slot 13 is conveniently positioned according to the first solder joint 11, or the first solder joint 11 is conveniently positioned according to the middle slot 13, thus facilitating improved production efficiency.

[0091] Similarly, in a case where the number of slots 13 in the set of slots 13 corresponding to the second solder joint 12 is odd, the set of slots 13 is symmetrical around the center line of the middle slot 13. In this way, the symmetrical arrangement of the set of slots 13 is advantageous for manufacturing, and the tensile stress can be absorbed more effectively by the deformation of the specially designed band 10 for connecting back-contact cells.

[0092] Furthermore, the center line of the middle slot 13 coincides with the center line of the corresponding second solder point 12. In this way, the middle slot 13 is conveniently positioned in accordance with the second solder point 12, or the second solder point 12 is conveniently positioned in accordance with the middle slot 13, thus facilitating improved production efficiency.

[0093] Referring to Fig. Optionally, the distances between the set of slots 13 corresponding to the first solder point 11 and the corresponding first solder point 11 can be equal in the width direction or in the length direction. This simplifies manufacturing and increases production efficiency.

[0094] In particular, the number of slots 13 in the set of slots 13 corresponding to the first solder point 11 is 2, and the two slots are symmetrical about the center line 111 of the first solder point. In the set of slots 13 corresponding to the second solder point 12, the number of slots 13 is 2, and the two slots are symmetrical about a center line of the second solder point 12.

[0095] Referring to Fig. 5 is optional in a case where the number of slots 13 in the set of slots 13 corresponding to the first solder joint 11 is an even number, and the set of slots 13 is symmetrical about the center lines of the two middle slots 13. In this way, the symmetrical arrangement of the set of slots 13 is advantageous for manufacturing, and the tensile stress can be absorbed more effectively by the deformation of the specially designed band 10 for connecting back-contact cells.

[0096] It should be noted that the center lines of the two middle slots are 13 lines that pass through the centers of the two middle slots and are parallel to the width direction.

[0097] Furthermore, the center lines of the two middle slots 13 coincide with the center line 111 of the corresponding first solder joint. In this way, the two middle slots 13 are conveniently positioned according to the first solder joint 11, or the first solder joint 11 is conveniently positioned according to the two middle slots 13, thus facilitating the improvement of production efficiency.

[0098] Similarly, in a case where the number of slots 13 in the set of slots 13 corresponding to the second solder joint 12 is an even number, the set of slots 13 is symmetrical about the center lines of the two middle slots 13. In this way, the symmetrical arrangement of the set of slots 13 is advantageous for manufacturing, and the tensile stress can be absorbed more effectively by the deformation of the specially designed band 10 for connecting back-contact cells.

[0099] Furthermore, the center lines of the two middle slots 13 coincide with the center line of the corresponding second solder point 12. In this way, the two middle slots 13 are conveniently positioned according to the second solder point 12, or the second solder point 12 is conveniently positioned according to the two middle slots 13, thus facilitating the improvement of production efficiency.

[0100] Referring to Fig. 6, a set of slots 13 optionally comprises a first slot 131, a second slot 132, a third slot 133, a fourth slot 134, and a fifth slot 135. The first slot 131 is located in the middle of the set of slots 13. The second slot 132 and the third slot 133 are each located on opposite sides of the first slot 131. The fourth slot 134 is located on a side of the second slot 132 facing away from the first slot 131. The fifth slot 135 is located on a side of the third slot 133 facing away from the first slot 131. Lengths of the set of slots 13 satisfy the following relationship: L1>L2=L3>L4=L5, where

[0101] L1 is a length of the first slot 131, L2 is a length of the second slot 132, L3 is a length of the third slot 133, L4 is a length of the fourth slot 134 and L5 is a length of the fifth slot 135.

[0102] In this way, one slot in the five slots 13 is located at a greater distance from the corresponding solder joints in the longitudinal direction and at a greater distance from the corresponding solder joints in the lateral direction. Furthermore, the lengths of the five slots 13 are symmetrical about the first slot 131 in the center, so that the tensile stress caused by the deformation of the specially designed band 10 for connecting back-contact cells can be better absorbed.

[0103] Referring to Fig. 6. Optionally, the length L1 of the first slot 131 can be from 1.75 mm to 1.85 mm. For example, the length is 1.75 mm, 1.8 mm, 1.82 mm, 1.83 mm, 1.84 mm, or 1.85 mm. Preferably, the length L1 of the first slot 131 is 1.8 mm.

[0104] Optionally, the length L2 of the second slot 132 can be from 1.5 mm to 1.7 mm. For example, the length is 1.5 mm, 1.55 mm, 1.58 mm, 1.6 mm, 1.65 mm, or 1.7 mm. Preferably, the length L2 of the second slot 132 is 1.6 mm.

[0105] Optionally, the length L3 of the third slot 133 can be from 1.5 mm to 1.7 mm. For example, the length is 1.5 mm, 1.55 mm, 1.58 mm, 1.6 mm, 1.65 mm, or 1.7 mm. Preferably, the length L3 of the third slot 133 is 1.6 mm.

[0106] Optionally, the length L4 of the fourth slot 134 can be from 0.6 mm to 0.8 mm. For example, the length is 0.6 mm, 0.65 mm, 0.68 mm, 0.7 mm, 0.75 mm, or 0.8 mm. Preferably, the length L4 of the fourth slot 134 is 0.7 mm.

[0107] Optionally, the length L5 of the fifth slot 135 can be from 0.6 mm to 0.8 mm. For example, the length is 0.6 mm, 0.65 mm, 0.68 mm, 0.7 mm, 0.75 mm, or 0.8 mm. Preferably, the length L5 of the fifth slot 135 is 0.7 mm.

[0108] Referring to Fig. 6. The specially designed band 10 for connecting back-contact cells optionally connects a first cell to a second cell. The body 101 comprises a first connecting section 1011 that covers the first cell, a second connecting section 1012 that covers the second cell, and a third connecting section 1013 that covers a gap between the first and second cells. The dimensions of the specially designed band 10 for connecting back-contact cells satisfy the following relationship: d1=L2, and / or d1=L3, where d1 is the width of the first connecting section 1011, L2 is the length of the second slot 132 and L3 is the length of the third slot 133.

[0109] In this way, the length(s) of the second slot 132 and / or the third slot 133 can correspond to the width of the first connecting section 1011, so that a part of the body 101 that is in contact with the solar cells has a greater deformability and a greater ability to absorb the strain stress, thereby further reducing the damage to the solar cells caused by the stress.

[0110] Referring to Fig. 6. A distance between two adjacent slots 13 in the set of slots 13 can optionally satisfy the following relationship: 0.2 <L1:(S1+S2)<1,5, where L1 is the length of the first slot 131, S1 is a distance between the first slot 131 and the second slot 132, and S2 is a distance between the second slot 132 and the fourth slot 134; and / or 0.2 <L1:(S3+S4)<1,5, where L1 is the length of the first slot 131, S3 is a distance between the first slot 131 and the third slot 133, and S4 is a distance between the third slot 133 and the fifth slot 135.

[0111] In this way, the distance between two adjacent slots 13 in the set of slots 13 is related to the length of the first slot 131, thereby absorbing the strain stress more effectively and minimizing damage to the solar cells caused by the stress.

[0112] In particular, a value of L1: (S3+S4) is, for example, 0.21, 0.22, 0.37, 0.8, 0.9, 1, 1.3 or 1.49.

[0113] In one example of Fig. 6 is the value of L1: (S3+S4) 0.37. L1 is 1.8 mm, S3 is 2.9 mm, and S4 is 2 mm.

[0114] Referring to Fig. 6. The width d1 of the first connecting section 1011 can be from 1.5 mm to 1.7 mm. For example, the width is 1.5 mm, 1.55 mm, 1.58 mm, 1.6 mm, 1.65 mm, or 1.7 mm. Preferably, the width d1 of the first connecting section 1011 is 1.6 mm.

[0115] Optionally, the width d2 of the second connecting section 1012 can be from 1.5 mm to 1.7 mm. For example, the width is 1.5 mm, 1.55 mm, 1.58 mm, 1.6 mm, 1.65 mm, or 1.7 mm. Preferably, the width d2 of the second connecting section 1012 is 1.6 mm.

[0116] Optionally, the width d3 of the third connecting section 1013 can be from 0.1 mm to 2 mm. For example, the width can be 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.8 mm, 1 mm, 1.5 mm, 1.7 mm, or 2 mm. Preferably, the width d3 of the third connecting section 1013 is 0.15 mm.

[0117] Optionally, the specially designed band 10 connects the first cell to the second cell for connecting back-contact cells. The first solder joint 11 is connected to a positive electrode of the first cell. The second solder joint 12 is connected to a negative electrode of the second cell. An area of ​​the first solder joint 11 is greater than or equal to an area of ​​the second solder joint 12. Alternatively, the first solder joint 11 is connected to a negative electrode of the first cell. The second solder joint 12 is connected to a positive electrode of the second cell. The area of ​​the second solder joint is greater than or equal to the area of ​​the first solder joint.

[0118] It can be understood that, since the current of the positive electrode is greater than that of the negative electrode, the width of the connecting section corresponding to the positive electrode can be larger, so that the structure of the band can be better adapted to the current of the cell.

[0119] In particular, the area of ​​the first solder joint 11 is greater than or equal to the area of ​​the second solder joint 12. The first solder joint 11 and the second solder joint 12 can have the same width, and the length of the first solder joint 11 is greater than the length of the second solder joint 12. Alternatively, the first solder joint 11 and the second solder joint 12 can have the same length, and the width of the first solder joint 11 is greater than the width of the second solder joint 12. Alternatively, the length of the first solder joint 11 is greater than the length of the second solder joint 12, and the width of the first solder joint 11 is greater than the width of the second solder joint 12.

[0120] Referring to Fig. Optionally, a plurality of slots 13 are provided, and the directions in which the plurality of slots 13 extend are all parallel to the lateral direction of the body 101. In this way, more tensile stresses can be absorbed in the longitudinal direction of the body 101, thereby reducing damage to the solar cells caused by the stresses. In addition, the directions in which the plurality of slots 13 extend are parallel to each other, which is practical for manufacturing and facilitates improved production efficiency.

[0121] It can be understood that in other embodiments, the directions in which all the slots 13 extend are all at an angle to the width direction of the body 101. Directions in which some of the slots 13 extend may be at an angle to the width direction of the body 101, and directions in which the remaining slots 13 extend are parallel to the width direction of the body 101. Furthermore, in a case where the directions in which the plurality of slots 13 extend are at an angle to the width direction of the body 101, the plurality of slots 13 may also be parallel to each other or not.

[0122] Referring to Fig. 6. The width w1 of the slot 13 can optionally range from 0.2 mm to 0.6 mm. For example, the width may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm. This ensures that the width w1 of the slot 13 is within a suitable range to avoid both poor deformability of the specially designed band 10 for connecting back-contact cells due to an insufficient width w1 of the slot 13 and relatively poor strength of the specially designed band 10 for connecting back-contact cells due to an excessive width w1 of the slot 13. A tolerance for the width w1 of the slot 13 can be ±0.05.

[0123] Preferably, the width w1 of the slot 13 is 0.4 mm. In this way, the deformability and mechanical strength of the specially designed band 10 for connecting back-contact cells can be taken into account, and an optimal overall effect can be achieved.

[0124] In particular, in an example of Fig. 6, the width w1 of the slot 13 is a dimension of the slot 13 in the longitudinal direction of the body 101.

[0125] Referring to Fig. 6. The distance between two adjacent slots 13 can optionally be from 1.5 mm to 4 mm. For example, the distance is 1.5 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.5 mm, 2.9 mm, 3 mm, 3.5 mm, or 4 mm. In this way, the distance between the two adjacent slots 13 is within a suitable range to avoid both relatively poor mechanical strength of the specially designed band 10 for connecting back-contact cells due to an excessively small distance between the two adjacent slots 13 and relatively poor deformability of the specially designed band 10 for connecting back-contact cells due to an excessively large distance between the two adjacent slots 13.

[0126] In particular, the distance between the two adjacent slots 13 is a distance between the center lines of the two adjacent slots 13. In Fig. 6. S1 is the distance between the first slot 131 and the second slot 132, which is 2.9 mm. S2 is the distance between the second slot 132 and the fourth slot 134, which is 2 mm. S3 is the distance between the first slot 131 and the third slot 133, which is 2.9 mm. S4 is the distance between the third slot 133 and the fifth slot 135, which is 2 mm. A. The tolerance is ±0.01.

[0127] In particular, the distance between the two adjacent slots 13 in the set of slots 13 can be the same or different. If the distances between the two adjacent slots 13 are the same, the distance between the two adjacent slots 13 is a fixed value within a range of 1.5 mm to 4 mm. If the distance between the two adjacent slots 13 is different, the distance between the two adjacent slots 13 is a variety of values ​​within the range of 1.5 mm to 4 mm.

[0128] Referring to Fig. 6. The distance D1 between two adjacent sets of slots 13 can be from 1.5 mm to 15 mm. For example, the distance may be 1.5 mm, 1.575 mm, 2 mm, 5 mm, 8 mm, 10 mm, 12 mm, or 15 mm. In this way, the distance D1 between the two adjacent sets of slots 13 is within a suitable range to avoid both relatively poor mechanical strength of the specially designed band 10 for connecting back-contact cells due to an excessively small distance D1 between the two adjacent sets of slots 13 and relatively poor deformability of the specially designed band 10 for connecting back-contact cells due to an excessively large distance D1 between the two adjacent sets of slots 13. Preferably, the distance D1 between two adjacent sets of slots 13 is 1.575 mm.

[0129] In particular, the distance between two adjacent sets of slots 13 is a distance between two slots 13 in two sets of slots 13 that are closest to each other.

[0130] Referring to Fig. 7, the body 101 is optionally provided with contact holes 14. Another end of the slot 13 is connected to each of the contact holes 14. In this way, the deformation of the specially designed band 10 for connecting back-contact cells can be absorbed by the contact holes 14, thereby reducing damage to the solar cells caused by the voltage. Furthermore, the slots 13 are connected to the contact holes 14, resulting in a better effect in absorbing the deformation of the band 10.

[0131] In particular, one or more contact holes 14 may be present. A contact hole 14 may be connected to a slot 13, a plurality of slots 13 may be connected to a contact hole 14, or a slot 13 may be connected to a plurality of contact holes 14. The manner in which the slot 13 is connected to the contact hole 14 is not limited here.

[0132] Referring to Fig. The contact holes 14 corresponding to the second slot 132 and the third slot 133 have an oval shape, and the length of a short axis of each contact hole is greater than the width of the gap between the first cell and the second cell. The contact holes 14 corresponding to the second slot 132 and the third slot 133 are not aligned with the third connecting section 1013.

[0133] Referring to Fig. 7. Optionally, the length of the long axis of the contact hole 14, corresponding to the first slot 131, can be from 2.3 mm to 2.5 mm. For example, the length of the long axis is 2.3 mm, 2.32 mm, 2.38 mm, 2.4 mm, 2.45 mm, or 2.5 mm. Preferably, the length of the long axis of the contact hole 14, corresponding to the first slot 131, is 2.4 mm.

[0134] Referring to Fig. Optionally, the short axis length of the contact hole 14, corresponding to the first slot 131, can be from 0.9 mm to 1.1 mm. For example, the short axis length is 0.9 mm, 0.92 mm, 0.95 mm, 1 mm, 1.05 mm, or 1.1 mm. Preferably, the short axis length of the contact hole 14, corresponding to the first slot 131, is 1 mm.

[0135] Referring to Fig. Optionally, the length of the long axis of the contact hole 14, corresponding to the second slot 132, can be from 1.9 mm to 2.1 mm. For example, the length of the long axis is 1.9 mm, 1.92 mm, 1.95 mm, 2 mm, 2.05 mm, 2.07 mm, or 2.1 mm. Preferably, the length of the long axis of the contact hole 14, corresponding to the second slot 132, is 2 mm.

[0136] Referring to Fig. Optionally, the length of the short axis of a contact hole 14 corresponding to the second slot 132 can be from 0.75 mm to 0.85 mm. For example, the short axis length is 0.75 mm, 0.76 mm, 0.78 mm, 0.8 mm, 0.81 mm, 0.84 mm, or 0.85 mm. Preferably, the short axis length of the contact hole 14 corresponding to the second slot 132 is 0.8 mm.

[0137] Referring to Fig. Optionally, the length of the long axis of the contact hole 14, corresponding to the third slot 133, can be from 1.9 mm to 2.1 mm. For example, the length of the long axis is 1.9 mm, 1.92 mm, 1.95 mm, 2 mm, 2.05 mm, 2.07 mm, or 2.1 mm. Preferably, the length of the long axis of the contact hole 14, corresponding to the third slot 133, is 2 mm.

[0138] Referring to Fig. Optionally, the length of the short axis of the contact hole 14, corresponding to the third slot 133, can be from 0.75 mm to 0.85 mm. For example, the length of the short axis is 0.75 mm, 0.76 mm, 0.78 mm, 0.8 mm, 0.81 mm, 0.84 mm, or 0.85 mm. Preferably, the length of the short axis of the contact hole 14, corresponding to the third slot 133, is 0.8 mm.

[0139] Referring to Fig. Optionally, the length of the long axis of the contact hole 14, corresponding to the fourth slot 134, can be from 1.1 mm to 1.3 mm. For example, the length of the long axis is 1.1 mm, 1.11 mm, 1.14 mm, 1.2 mm, 1.25 mm, 1.27 mm, or 1.3 mm. Preferably, the length of the long axis of the contact hole 14, corresponding to the fourth slot 134, is 1.2 mm.

[0140] Referring to Fig. Optionally, the length of the short axis of the contact hole 14, corresponding to the fourth slot 134, can be from 0.5 mm to 0.7 mm. For example, the length of the short axis is 0.5 mm, 0.51 mm, 0.58 mm, 0.6 mm, 0.64 mm, 0.68 mm, or 0.7 mm. Preferably, the length of the short axis of the contact hole 14, corresponding to the fourth slot 134, is 0.6 mm.

[0141] Referring to Fig. Optionally, the length of the long axis of the contact hole 14, corresponding to the fifth slot 135, can be from 1.1 mm to 1.3 mm. For example, the length of the long axis is 1.1 mm, 1.11 mm, 1.14 mm, 1.2 mm, 1.25 mm, 1.27 mm, or 1.3 mm. Preferably, the length of the long axis of the contact hole 14, corresponding to the fifth slot 135, is 1.2 mm.

[0142] Referring to Fig. Optionally, the length of the short axis of the contact hole 14, corresponding to the fifth slot 135, can be from 0.5 mm to 0.7 mm. For example, the length of the short axis is 0.5 mm, 0.51 mm, 0.58 mm, 0.6 mm, 0.64 mm, 0.68 mm, or 0.7 mm. Preferably, the length of the short axis of the contact hole 14, corresponding to the fifth slot 135, is 0.6 mm.

[0143] Referring to Fig. 7 optionally four rounded corners are formed at a connection between the first slot 131 and the corresponding contact hole 14, the radii of which are all 0.2.

[0144] Referring to Fig. 7 optionally four rounded corners are formed at a connection between the second slot 132 and the corresponding contact hole 14, the radii of which are all 0.2.

[0145] Referring to Fig. 7 optionally four rounded corners are formed at a connection between the third slot 133 and the corresponding contact hole 14, the radii of which are all 0.2.

[0146] Referring to Fig. 7 optionally four rounded corners are formed at a connection between the fourth slot 134 and the corresponding contact hole 14, the radii of which are all 0.1.

[0147] Referring to Fig. 7 optionally four rounded corners are formed at a connection between the fifth slot 135 and the corresponding contact hole 14, the radii of which are all 0.1.

[0148] Referring to Fig. 8, the first solder point 11 is optionally connected to the first cell. The second solder point 12 is connected to the second cell. The contact hole 14 has an oval shape. The length of the short axis of the contact hole 14 corresponds to the width of the gap between the first and second cells. The long axis of the contact hole 14 coincides with a center line 1001 of the body 101.

[0149] In this way, the short axis of the contact hole 14 is positioned between the first cell and the second cell and lies parallel to the lateral direction of the body 101. The long axis of the contact hole 14 lies parallel to the longitudinal direction of the body 101. Therefore, the effect of absorbing the deformation of the specially designed band 10 for connecting back-contact cells through the contact hole 14 can be improved, further reducing damage to the solar cells caused by the voltage.

[0150] In particular, the longitudinal axis of the contact hole 14 coincides with a center line of the gap between the first cell and the second cell. In this way, the effect of absorbing the deformation of the band 10 through the contact hole 14 can be improved, and the damage to the cells caused by the stress can be further minimized.

[0151] In particular, in one example of Fig. 8 in the contact holes 14, which correspond to the set of slots 13, the contact holes 14, which correspond to the second slot 132 and the third slot 133, have an oval shape, the length of the short axis is the width of the gap between the first cell and the second cell, and the long axis coincides with the center line 1001 of the body 101. In this way, the deformation of the specially designed band 10 for connecting back contact cells at other positions of the body 101 is absorbed by the contact holes 14, which correspond to the first slot 131, the fourth slot 134 and the fifth slot 135, thereby achieving a better effect in absorbing deformations.

[0152] It can be understood that in other examples all contact holes 14 corresponding to the set of slots 13 can have an oval shape, the lengths of the short axes are all the width of the gap between the first cell and the second cell, and the long axes coincide with the center line 1001 of the body 101.

[0153] It can be understood that in other examples the contact holes 14 may not only have an oval shape, but also a circular shape, a semicircular shape, a diamond shape, or other shapes. The shapes of the multitude of contact holes 14 can be the same or different and are not limited here.

[0154] Optionally, two adjacent contact holes 14 in a set of contact holes 14, corresponding to each first solder joint 11, are longitudinally offset from one another. In this way, the current can be transferred more effectively in order to more effectively absorb the deformation of the specially designed band 10 for connecting back-contact cells.

[0155] It can be understood that in other embodiments the two adjacent contact holes 14 in the set of contact holes 14 corresponding to each first solder joint 11 may partially or completely overlap in the longitudinal direction.

[0156] Referring to Fig. 7 and Fig. Optionally, each first solder joint 11 corresponds to the set of contact holes 14. Increasing the longitudinal distances between the contact holes and the corresponding first solder joint 11 results in a reduction of the long and short axes of the set of contact holes 14. Optionally, each second solder joint 12 corresponds to the set of contact holes 14. Increasing the longitudinal distances between each of the contact holes and the corresponding second solder joint 12 results in a reduction of the long and short axes of the set of contact holes 14. In this way, current can be transmitted more effectively through the specially designed band 10 for connecting back-contact cells, and the specially designed band 10 for connecting back-contact cells has a better effect on voltage absorption.

[0157] It can be understood that in other embodiments, each first solder joint 11 can correspond to the set of contact holes 14. Increasing the longitudinal distance between each of the contact holes and the corresponding first solder joint 11 leads to an increase in the long and short axes of the set of contact holes 14. In other embodiments, each second solder joint 12 can correspond to the set of contact holes 14. Increasing the longitudinal distance between each of the contact holes and the corresponding second solder joint 12 leads to an increase in the long and short axes of the set of contact holes 14.

[0158] Referring to Fig. 8, optionally the distances between two adjacent slots 13 in the set of slots 13 can be the same.

[0159] It can be understood that the distances between the two adjacent slots 13 in the set of slots 13 may be different, or may be partly the same and partly different.

[0160] It is obvious to experts that changes and modifications may be made and the attached claims are therefore intended to cover all such changes and modifications.

Claims

[1] A specially designed band for connecting back-contact cells, the band comprising: a body; and a multitude of first solder joints and a multitude of second solder joints, each arranged on two sides of the body in a width direction, wherein Each of the first solder joints extends from a first side of the body outwards; Each of the second solder joints extends outwards from a second side of the body; and a shape of each first solder joint differs from a shape of each second solder joint; and / or center lines of the plurality of first solder joints and the plurality of second solder joints that are adjacent to each other are offset from each other in the width direction of the body. [2] The specially designed band according to claim 1, wherein the body comprises a plurality of slots and one end of each of the slots forms an opening on the body. [3] The specially designed band according to claim 2, wherein each first solder joint corresponds to a set of slots and a slot in the set of slots is located at a greater distance from the corresponding first solder joint in a longitudinal direction and at a greater distance from the corresponding first solder joint in the width direction; and / or each second solder joint corresponds to a set of slots and a slot in the set of slots is located at a greater distance from the corresponding second solder joint in a longitudinal direction and at a greater distance from the corresponding second solder joint in the width direction. [4] The specially designed band according to claim 3, wherein the set of slots comprises a first slot, a second slot, a third slot, a fourth slot and a fifth slot; the first slot is arranged in the middle of the set of slots and the second slot and the third slot are each located on opposite sides of the first slot; the fourth slot is arranged on a side of the second slot that faces away from the first slot, and the fifth slot is arranged on a side of the third slot that faces away from the first slot; and lengths of the set of slots satisfy the following relationship: L1>L2=L3>L4=L5, where L1 is the length of the first slot, L2 is the length of the second slot, L3 is the length of the third slot, L4 is the length of the fourth slot, and L5 is the length of the fifth slot. [5] The specially designed band according to claim 4, wherein the specially designed band for connecting back-contact cells connects a first cell to a second cell and the body comprises a first connecting section covering the first cell, a second connecting section covering the second cell, and a third connecting section covering a gap between the first cell and the second cell; dimensions of the specially designed band for connecting back-contact cells satisfy the following relationship: d1=L2, and / or d1=L3, where d1 is the width of the first connecting section, L2 is the length of the second slot, and L3 is the length of the third slot. [6] The specially designed band according to claim 4, wherein a distance between two adjacent slots in the set of slots satisfies the following relationship: 0.2 <L1:(S1+S2)<1,5, where L1 is the length of the first slot, S1 is a distance between the first slot and the second slot, and S2 is a distance between the second slot and the fourth slot; and / or 0.2 <L1:(S3+S4)<1,5, where L1 is the length of the first slot, S3 is a distance between the first slot and the third slot, and S4 is a distance between the third slot and the fifth slot. [7] The specially designed band according to claim 2, wherein each first solder joint corresponds to a set of slots and a slot in the set of slots is located at a greater distance from the corresponding first solder joint in a longitudinal direction and at a smaller distance from the corresponding first solder joint in the width direction; and / or each second solder joint corresponds to a set of slots and a slot in the set of slots is located at a greater distance from the corresponding second solder joint in a longitudinal direction and at a smaller distance from the corresponding second solder joint in the width direction. [8] The specially designed band according to claim 2, wherein each first solder joint corresponds to a set of slots and the distances between two adjacent slots in the set of slots are equal; and / or each second solder joint corresponds to a set of slots and the distances between two adjacent slots in the set of slots are equal. [9] The specially designed band according to claim 2, wherein directions in which the plurality of slots extend are parallel to the width direction of the body. [10] The specially designed band according to claim 2, wherein the width of each of the slots is from 0.2 mm to 0.6 mm. [11] The specially designed band according to claim 2, wherein the distance between two adjacent slots is from 1.5 mm to 4 mm. [12] The specially designed band according to claim 2, wherein the distance between two adjacent sets of slots is from 1.5 mm to 15 mm. [13] The specially designed band for connecting back contact cells according to one of claims 2-12, wherein the body further comprises a contact hole and another end of each of the slots is connected to the contact hole. [14] The specially designed band according to claim 13, wherein the plurality of first solder joints is connected to the first cell; the plurality of second solder joints is connected to the second cell; the contact hole has an elliptical shape, a length of a short axis of the contact hole is a width of the gap between the first cell and the second cell, and a long axis of the contact hole coincides with a center line of the body. [15] The specially designed band according to claim 13, wherein the contact hole has an elliptical shape, a circular shape, a semicircular shape or a rhombic shape. [16] The specially designed band according to claim 13, wherein two adjacent contact holes of a set corresponding to each first solder joint are offset from each other in the longitudinal direction thereof. [17] The specially designed band according to claim 1, wherein the width of the body is from 2.3 mm to 6 mm. [18] The specially designed band according to claim 1, wherein the distance between the first solder joint and the second solder joint, which are adjacent to each other in the width direction of the body, is from 5 mm to 15 mm. [19] The specially designed band according to claim 1, wherein the thickness of the specially designed band is from 0.1 mm to 0.3 mm. [20] The specially designed strip according to claim 1, comprising: a copper substrate and a tin layer applied to the copper substrate; or an aluminum substrate and a tin layer applied to the aluminum substrate; or the specially designed strip is an aluminum strip or a tin strip. [21] The specially designed band according to claim 1, wherein the plurality of first solder joints are arranged equidistantly on the first side of the body in a longitudinal direction of the body; and / or the plurality of second solder joints are arranged equidistantly on the second side of the body in a longitudinal direction of the body. [22] The specially designed band according to claim 1, wherein the body has a rectangular shape; or the body has a curved shape and the plurality of first solder joints and the plurality of second solder joints are arranged at curved corners. [23] The specially designed band according to claim 1, wherein each first solder joint has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape or a trapezoidal shape; and / or each second solder joint has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape or a trapezoidal shape. [24] The specially designed tape according to claim 1, wherein an enclosed angle of 20° to 60° is formed between a line connecting each first solder joint with each second solder joint nearest to the first solder joint and a longitudinal direction of the tape. [25] The specially designed band according to claim 1, wherein the specially designed band for connecting back-contact cells connects a first cell to a second cell, each first solder joint is connected to a positive electrode of the first cell, each second solder joint is connected to a negative electrode of the second cell and an area of ​​the first solder joint is greater than or equal to an area of ​​the second solder joint; or each first solder joint is connected to a negative electrode of the first cell, each second solder joint is connected to a positive electrode of the second cell and an area of ​​the second solder joint is greater than or equal to the area of ​​the first solder joint.

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