A photovoltaic soldering ribbon and cell string

Abstract

The application is suitable for the technical field of solar cells, and provides a photovoltaic welding strip and a cell string. The photovoltaic welding strip comprises a body, a plurality of first welding points and a plurality of second welding points; the plurality of first welding points and the plurality of second welding points are respectively located on two sides of the body in the width direction; each first welding point extends outward from one side of the body; each second welding point extends outward from the other side of the body; the center lines of the first welding points and the second welding points are staggered in the width direction of the body; the photovoltaic welding strip further comprises a first slot formed in the body and corresponding to the first welding points, and the distance between two opposite sides of the first slot gradually increases in the direction away from the first welding points; and / or the photovoltaic welding strip further comprises a second slot formed in the body and corresponding to the second welding points, and the distance between two opposite sides of the second slot gradually increases in the direction away from the second welding points. In this way, the photovoltaic welding strip can better absorb the expansion and contraction stress through deformation, and thus the damage of the stress to the solar cell is minimized.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a photovoltaic ribbon and a cell string. Background Technology

[0002] Solar cells generate electricity by using the photovoltaic effect of semiconductor pn junctions to convert sunlight into electrical energy, making them a sustainable and clean energy source.

[0003] Related technologies typically utilize solder ribbons to connect multiple solar cells into a single unit, which is then encapsulated into a battery module through processes such as laying and lamination. However, thermal mismatch between the solder ribbon and the solar cell—that is, the difference in the coefficient of thermal expansion and contraction with temperature changes—results in excessive stress between the solar cell and the solder ribbon, leading to solar cell cracking and fragmentation. The thermal expansion and contraction of the solder ribbon also subject the battery to stretching and contracting stress from the ribbon, further contributing to solar cell cracking and fragmentation.

[0004] Therefore, how to design the solder strip to reduce stress damage to solar cells has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a photovoltaic solder ribbon and a cell string, aiming to solve the problem of how to design the solder ribbon to reduce stress damage to solar cells.

[0006] Firstly, the photovoltaic welding strip provided in this application includes:

[0007] ontology;

[0008] Multiple first solder joints and multiple second solder joints are respectively located on both sides of the body in the width direction;

[0009] Each of the first solder joints extends outward from one side of the body;

[0010] Each of the second solder joints extends outward from the other side of the body;

[0011] The center lines of the first solder joint and the second solder joint are offset in the width direction of the body;

[0012] A first slot is formed in the body and corresponds to the first solder joint, wherein the distance between the two opposite sides of the first slot gradually increases in the direction away from the first solder joint;

[0013] And / or, a second slot formed in the body and corresponding to the second solder point, wherein the distance between the two opposite sides of the second slot gradually increases in the direction away from the second solder point.

[0014] Optionally, the first slot includes a first bottom point, the second slot includes a second bottom point near the first bottom point, the first weld point includes a third bottom point near the first bottom point, and the distance between the first bottom point and the second bottom point is greater than the distance from the third bottom point to the adjacent groove edge of the first bottom point.

[0015] Optionally, the depth of the first groove is 1mm-3.5mm; and / or, the depth of the second groove is 1mm-3.5mm.

[0016] Optionally, the width of the first slot is 5mm-15mm; and / or, the width of the second slot is 5mm-15mm.

[0017] Optionally, the first slot includes a first slot edge and a second slot edge opposite to each other, the first slot edge forming an angle of 10°-40° with the length direction of the body, and / or the second slot edge forming an angle of 10°-40° with the length direction; and / or, the second slot includes a third slot edge and a fourth slot edge opposite to each other, the third slot edge forming an angle of 10°-40° with the length direction of the body, and / or the fourth slot edge forming an angle of 10°-40° with the length direction.

[0018] Optionally, the first slot includes opposing first and second slot edges, the first and second slot edges forming a first rounded corner; and / or, the second slot includes opposing third and fourth slot edges, the third and fourth slot edges forming a second rounded corner.

[0019] Optionally, the radius of the first fillet is 0.5mm-1.5mm; and / or, the radius of the second fillet is 0.5mm-1.5mm.

[0020] Optionally, the first slot includes a first bottom point, the second slot includes a second bottom point near the first slot, and the angle between the line connecting the first bottom point and the second bottom point and the length direction of the body is 75°-90°.

[0021] Optionally, the first slot includes a first bottom point and a fourth bottom point, the body forms a third rounded corner corresponding to the first bottom point, and / or the body forms a fourth rounded corner corresponding to the fourth bottom point;

[0022] And / or, the second slot includes a second bottom point and a fifth bottom point, and the body forms a fifth rounded corner corresponding to the second bottom point, and / or, the body forms a sixth rounded corner corresponding to the fifth bottom point.

[0023] Optionally, the radius of the third rounded corner is 0.1mm-1mm; and / or, the radius of the fourth rounded corner is 0.1mm-1mm; and / or, the radius of the fifth rounded corner is 0.1mm-1mm; and / or, the radius of the sixth rounded corner is 0.1mm-1mm.

[0024] Optionally, the width of the body is 2.3mm-6mm.

[0025] Optionally, the distance between adjacent first and second solder joints in the width direction of the body is 6mm-20mm.

[0026] Optionally, the thickness of the photovoltaic welding strip is 0.1mm-0.3mm.

[0027] Optionally, the photovoltaic solder strip includes a copper substrate and a tin layer coated on the copper substrate; or, the photovoltaic solder strip includes an aluminum substrate and a tin layer coated on the aluminum substrate; or, the photovoltaic solder strip is an aluminum strip; or, the photovoltaic solder strip is a tin strip.

[0028] Optionally, a plurality of the first solder points are distributed at equal intervals along the length direction of the body on one side of the body;

[0029] And / or, a plurality of the second solder points are distributed at equal intervals along the length of the body on the other side of the body.

[0030] Optionally, the first solder joint is rectangular, rounded rectangle, circle, semicircle, or trapezoidal; and / or, the second solder joint is rectangular, rounded rectangle, circle, semicircle, or trapezoidal.

[0031] Optionally, the line connecting the first solder joint and the second solder joint closest to the first solder joint forms an angle with the length direction of the solder strip, and the angle is 20°-60°.

[0032] Optionally, the photovoltaic welding ribbon connects the first battery and the second battery, the first welding point connects to the positive electrode of the first battery, the second welding point connects to the negative electrode of the second battery, and the area of ​​the first welding point is greater than or equal to the area of ​​the second welding point; or, the first welding point connects to the negative electrode of the first battery, the second welding point connects to the positive electrode of the second battery, and the area of ​​the second welding point is greater than or equal to the area of ​​the first welding point.

[0033] Secondly, the battery string provided in this application includes multiple solar cells and photovoltaic ribbons of any of the above, wherein the photovoltaic ribbons connect at least two of the solar cells.

[0034] In the photovoltaic ribbon and cell string of this application embodiment, since the distance between the two opposite sides of the slot gradually increases in the direction away from the solder joint, the deformation of the photovoltaic ribbon can better absorb the expansion and contraction stress, thereby minimizing the damage of stress to the solar cell. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a photovoltaic solder strip according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of a partial structure of a photovoltaic solder ribbon according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of a partial structure of a photovoltaic solder ribbon according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of a battery string according to an embodiment of this application.

[0039] Explanation of key component symbols:

[0040] Photovoltaic welding strip 10, body 101, gradient section 1017, pivot line 1018, non-pivot line 1019; first welding point 11, center line of the first welding point 111, third bottom point 118, first slot 119, first slot edge 1191, second slot edge 1192, first rounded corner 1193, first bottom point 1194, fourth bottom point 1195;

[0041] Second weld point 12, center line of the second weld point 121, second slot 129, third slot edge 1291, fourth slot edge 1292, second rounded corner 1293, second bottom point 1294, fifth bottom point 1295;

[0042] The width w0 of the body, the length L0 of the body, the distance S0 between adjacent first and second solder joints in the width direction of the body, the depth H1 of the first slot, and the depth H2 of the second slot. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] Please see Figure 1 and Figure 2The photovoltaic solder ribbon 10 of this application embodiment includes a body 101, a plurality of first solder points 11, and a plurality of second solder points 12. The plurality of first solder points 11 and the plurality of second solder points 12 are respectively located on both sides of the body 101 in the width direction. Each first solder point 11 extends outward from one side of the body 101. Each second solder point 12 extends outward from the other side of the body 101. The center lines of the first solder points 11 and the second solder points 12 are staggered in the width direction of the body 101. The photovoltaic solder ribbon 10 also includes a first slot 119 formed in the body 101 and corresponding to the first solder points 11, the spacing between the two opposite sides of the first slot 119 gradually increases in the direction away from the first solder points 11; and / or, the photovoltaic solder ribbon 10 also includes a second slot 129 formed in the body 101 and corresponding to the second solder points 12, the spacing between the two opposite sides of the second slot 129 gradually increases in the direction away from the second solder points 12.

[0045] In this embodiment of the photovoltaic ribbon 10, since the distance between the two opposite sides of the slot gradually increases in the direction away from the solder joint, the deformation of the photovoltaic ribbon 10 can better absorb the expansion and contraction stress, thereby minimizing the damage of stress to the solar cell.

[0046] It is understandable that the weld strip 10 absorbs stress in the length, width and thickness directions through deformation.

[0047] Please note that the formation of the first slot 119 and / or the second slot 129 in the body 101 includes three cases: First, the body 101 forms the first slot 119 and the second slot 129, such as... Figure 1 and Figure 2 As shown; in the second case, the body 101 has a first groove 119 but no second groove 129; in the third case, the body 101 has a second groove 129 but no first groove 119. For ease of explanation, the following description uses the body 101 having a first groove 119 and a second groove 129 as an example, but this does not imply a limitation on the aforementioned cases.

[0048] Please note that the distance between the two opposite sides of the slot gradually increases in the direction away from the corresponding weld point. It can be that both opposite sides of the slot are at acute or obtuse angles to the length direction; or it can be that one opposite side of the slot is at an acute angle to the length direction, and the other opposite side is at a right angle to the length direction.

[0049] Please see Figure 2Specifically, since the distance between the two opposite sides of the first slot 119 and the second slot 129 gradually increases in the direction away from the solder joint, two narrowing transition sections 1017 can be formed between adjacent first solder joints 11 and second solder joints 12. The junction of the two transition sections 1017 is a non-pivot line 1019, and the non-junction of the two transition sections 1017 is a pivot line 1018. In this way, when the photovoltaic solder ribbon 10 is subjected to expansion and contraction stress, the pivot line 1018 arches, that is, it bends at the pivot line 1018, thereby absorbing the expansion and contraction stress and minimizing the damage of stress to the solar cell.

[0050] It is understood that when the body 101 has a first slot 119 but no second slot 129, a tapered portion 1017 is formed between adjacent first solder joints 11 and second solder joints 12. The narrowest end of the tapered portion 1017 is close to the first solder joint 11 and has a pivot line 1018.

[0051] Similarly, when the body 101 has a second slot 129 but no first slot 119, a tapered portion 1017 is formed between adjacent first solder joints 11 and second solder joints 12. The narrowest end of the tapered portion 1017 is close to the second solder joint 12 and has a pivot line 1018.

[0052] Specifically, the cross-sectional area corresponding to the non-pivot line 1019 is larger than the cross-sectional area corresponding to the pivot line 1018. The cross-section is formed by cutting along the thickness direction of the photovoltaic ribbon 10. This makes it easier for the ribbon to bend at the pivot line 1018, thereby improving the absorption of tensile stress.

[0053] Specifically, the thickness of the photovoltaic ribbon 10 corresponding to the pivot line 1018 is less than the thickness of the photovoltaic ribbon 10 corresponding to the non-pivot line 1019. This allows the gradient portion 1017 to bend better around the pivot line 1018, thereby improving the absorption of expansion and contraction stress.

[0054] Specifically, the shapes of the first solder point 11 and the second solder point 12 may be different. It can be understood that different shapes of the solder points on both sides or misaligned center lines can make the photovoltaic solder strip 10 asymmetrical.

[0055] It is understandable that the misalignment of the weld points on both sides of the body 101 allows for a longer body 101 between the weld points to absorb stress deformation, thus better absorbing tensile and torsional deformation. Furthermore, it provides space for the first slot 119 and the second slot 129 formed between the first weld point 11 and the second weld point 12.

[0056] It can be understood that "the center lines of the first solder joint 11 and the second solder joint 12 are offset in the width direction of the body 101" can mean: a group of adjacent first solder joints 11 and second solder joints 12 offset in the width direction of the body 101; multiple groups of adjacent first solder joints 11 and second solder joints 12 offset in the width direction of the body 101, with the remaining adjacent first solder joints 11 and second solder joints 12 coinciding in the width direction of the body 101; or all adjacent first solder joints 11 and second solder joints 12 offset in the width direction of the body 101. This article uses the last case as an example for explanation and illustration, but this does not represent a limitation on the above situations.

[0057] Please note that each set of adjacent first solder points 11 and second solder points 12 is staggered, which can form a first slot 119 and / or a second slot 129. When there are multiple sets of adjacent first solder points 11 and second solder points 12 that are staggered, multiple slots can be formed, or only one slot can be formed.

[0058] It can be understood that "offset in the width direction of body 101" means that they do not overlap in the width direction.

[0059] It can be understood that the centerline 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. The centerline 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.

[0060] Please see Figure 3 Optionally, the line connecting the first solder point 11 and the second solder point 12 closest to the first solder point 11 forms an angle γ with the length direction of the solder strip 10, where the angle γ is 20°-60°. This provides appropriate offset between the first solder point 11 and the second solder point 12, allowing space for the first slot 119 and the second slot 129 formed between the first solder point 11 and the second solder point 12. This facilitates better absorption of stretching stress through the deformation of the solder strip 10, thereby minimizing stress damage to the battery.

[0061] Specifically, the included angle γ is, for example, 21°, 23°, 30°, 32°, 35°, 39°, 40°, 45°, 50°, 55°, or 60°.

[0062] Furthermore, the included angle γ is 20°-40°. In this way, the offset between the first solder point 11 and the second solder point 12 is more appropriate, making it easier to cut grooves.

[0063] Preferably, γ is 23°. This makes the degree of misalignment between the first solder joint 11 and the second solder joint 12 most suitable.

[0064] Optionally, the thickness of the photovoltaic ribbon 10 is 0.1mm-0.3mm. For example, it can be 0.1mm, 0.12mm, 0.14mm, 0.18mm, 0.2mm, 0.21mm, 0.25mm, 0.27mm, or 0.3mm. This ensures that the thickness of the photovoltaic ribbon 10 is within a suitable range, avoiding poor absorption of tensile stress or low mechanical strength due to excessive thickness, and also avoiding high cost due to excessive thickness.

[0065] Preferably, the thickness of the photovoltaic welding ribbon 10 is 0.14 mm. This balances the photovoltaic welding ribbon 10's ability to absorb tensile stress, mechanical strength, and cost, resulting in the best overall performance.

[0066] Optionally, the photovoltaic solder ribbon 10 includes a copper substrate and a tin layer coated on the copper substrate. This results in better conductivity of the photovoltaic solder ribbon 10, leading to better electrical connection of the solar cell.

[0067] Specifically, the hardness range of the photovoltaic welding ribbon 10 is 40HV-60HV. For example, it is 40HV, 42HV, 45HV, 48HV, 50HV, 53HV, 55HV, 59HV, and 60HV. Thus, the photovoltaic welding ribbon 10 has good mechanical strength.

[0068] Specifically, the uniformity of the tin layer is ±10%. For example, it is -10%, -8%, -5%, -2%, 0%, 1%, 5%, 7%, 10%. In this way, the photovoltaic solder ribbon 10 has good conductivity.

[0069] Specifically, the thickness of the tin layer is 6μm-10μm. For example, it is 6μm, 6.2μm, 7μm, 7.5μm, 8μm, 9μm, or 10μm.

[0070] In other embodiments, the photovoltaic ribbon 10 may also include an aluminum substrate and a tin layer coated on the aluminum substrate; or, the photovoltaic ribbon 10 may be an aluminum ribbon; or, the photovoltaic ribbon 10 may be a tin ribbon.

[0071] Optionally, the elongation of the photovoltaic ribbon 10 is ≥25%. For example, it is 25%, 27%, 30%, or 35%.

[0072] Please see Figure 1Optionally, the width w0 of the body 101 is 2.3mm-6mm. For example, it can be 2.3mm, 2.4mm, 2.8mm, 3mm, 3.35mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.8mm, or 6mm. This ensures the width w0 of the body 101 is within a suitable range, avoiding situations where the width w0 is too small, resulting in poor absorption of tensile stress by the photovoltaic ribbon 10 or difficulty in connecting the photovoltaic ribbon 10 to the solar cell. It also avoids situations where the width w0 is too large, leading to higher costs for the photovoltaic ribbon 10. The tolerance for the width w0 of the body 101 can be ±0.1mm.

[0073] Preferably, the width w0 of the body 101 is 3.35 mm. This balances the effect of the photovoltaic ribbon 10 in absorbing expansion and contraction stress, achieving connection of the solar cell, and reducing costs, resulting in the best overall performance.

[0074] Please see Figure 1 Optionally, the length L0 of the body 101 is 170mm-220mm. For example, it is 170mm, 176mm, 180mm, 182mm, 210mm, 218mm, or 220mm. The tolerance of the length L0 of the body 101 can be ±0.1mm.

[0075] Preferably, the length L0 of the body 101 is 176 mm.

[0076] Please see Figure 1 Optionally, each first solder joint 11 extends outward from one side of the body 101 along the width direction of the body 101. Each second solder joint 12 extends outward from the other side of the body 101 along the width direction of the body 101. In this way, the arrangement of the first solder joints 11 and the second solder joints 12 is more regular and easier to manufacture.

[0077] It is understood that in other embodiments, each first solder point 11 may extend outward from one side of the body 101 in a direction that forms an acute or obtuse angle with the width direction of the body 101; some of the first solder points 11 may extend outward from one side of the body 101 along the width direction of the body 101, while the remaining first solder points 11 may extend outward from one side of the body 101 in a direction that forms an acute or obtuse angle with the width direction of the body 101; each second solder point 12 may extend outward from one side of the body 101 in a direction that forms an acute or obtuse angle with the width direction of the body 101; some of the second solder points 12 may extend outward from one side of the body 101 along the width direction of the body 101, while the remaining second solder points 12 may extend outward from one side of the body 101 in a direction that forms an acute or obtuse angle with the width direction of the body 101. Specifically, when multiple first solder points 11 form acute or obtuse angles with the width direction of the body 101, the angles formed by the multiple first solder points 11 can be the same or different; when multiple second solder points 12 form acute or obtuse angles with the width direction of the body 101, the angles formed by the multiple second solder points 12 can be the same or different.

[0078] Please see Figure 1 Optionally, multiple first solder points 11 are evenly spaced along the length of the body 101 on one side. Optionally, multiple second solder points 12 are evenly spaced along the length of the body 101 on the other side. In this way, the body 101 between each segment of the first solder point 11 and the second solder point 12 has the same ability to absorb expansion and contraction stress, which helps to further reduce damage to the solar cell. At the same time, the arrangement of the solder points is relatively regular, which is convenient for manufacturing and also makes it easier to ensure that the center lines of adjacent solder points are staggered.

[0079] Specifically, the distance between adjacent first solder points 11 and second solder points 12 can be equal to the distance between two adjacent first solder points 11, and can be equal to the distance between two adjacent second solder points 12. In other words, the spacing between two adjacent solder points is equal. For example, for a battery with a side length of 182mm, there can be 5-15 first solder points 11, 5-15 second solder points 12, and the spacing between two adjacent solder points can be 6mm-20mm.

[0080] In other embodiments, the spacing between any two adjacent first solder points 11 may all be different; the spacing between any two adjacent first solder points 11 may be the same for some, while the spacing between any other two adjacent first solder points 11 may be different. Similarly, the spacing between any two adjacent second solder points 12 may all be different; the spacing between any two adjacent second solder points 12 may be the same for some, while the spacing between any other two adjacent second solder points 12 may be different. The specific arrangement of the solder points is not limited here.

[0081] Please see Figure 3Optionally, the spacing S0 between adjacent first solder points 11 and second solder points 12 in the width direction of the body 101 is 6mm-20mm. For example, it can be 6mm, 6.5mm, 8mm, 10mm, 11.375mm, 13mm, 15mm, 18mm, or 20mm. Further, the spacing S0 between adjacent first solder points 11 and second solder points 12 in the width direction of the body 101 is 10mm-15mm. For example, it can be 10mm, 11.375mm, 13mm, or 15mm. This ensures that S0 is within a suitable range, avoiding excessively large or small S0 that would result in poor deformation capacity and thus poor absorption of stretching stress, which helps reduce stress damage to the solar cell. The tolerance of the spacing S0 can be ±0.02.

[0082] Preferably, the distance S0 between adjacent first solder joints 11 and second solder joints 12 in the width direction of the body 101 is 11.375 mm. This maximizes the reduction of stress damage to the solar cell.

[0083] Optionally, the first solder joint 11 is rectangular, rounded rectangular, circular, semi-circular, or trapezoidal. Optionally, the second solder joint 12 is rectangular, rounded rectangular, circular, semi-circular, or trapezoidal.

[0084] Specifically, in Figure 1 , Figure 2 and Figure 3 In the example, the plurality of first solder points 11 and the plurality of second solder points 12 are all rounded rectangles. Further, the radius of the rounded corners is 0.2mm-0.4mm. For example, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.31mm, 0.35mm, 0.39mm, and 0.4mm. Preferably, the radius of the rounded corners is 0.3mm.

[0085] It is understandable that in other examples, the shapes of the first solder joint 11 and the second solder joint 12 may also be different; some of the first solder joints 11 may have the same shape but different from the rest of the first solder joints 11, or all of the first solder joints 11 may have different shapes; some of the second solder joints 12 may have the same shape but different from the rest of the second solder joints 12, or all of the second solder joints 12 may have different shapes.

[0086] Optionally, the length of the first solder joint 11 extending from the body 101 is 1.5mm-1.7mm. For example, it is 1.5mm, 1.52mm, 1.55mm, 1.6mm, 1.63mm, 1.65mm, 1.68mm, or 1.7mm. The tolerance for the length of the first solder joint 11 extending from the body 101 is ±0.05. Preferably, the length of the first solder joint 11 extending from the body 101 is 1.6mm.

[0087] Optionally, the width of the first solder joint 11 is 2.4mm-2.6mm. For example, it is 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, or 2.6mm. The tolerance for the width of the first solder joint 11 is ±0.05. Preferably, the width of the first solder joint 11 is 2.5mm.

[0088] Optionally, the length of the second solder joint 12 extending from the body 101 is 0.8mm-1.1mm. For example, it is 0.8mm, 0.82mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, or 1.1mm. The tolerance for the length of the first solder joint 11 extending from the body 101 is ±0.05mm. Preferably, the length of the first solder joint 11 extending from the body 101 is 0.95mm.

[0089] Optionally, the width of the second solder joint 12 is 2.4mm-2.6mm. For example, it is 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, or 2.6mm. The tolerance for the width of the second solder joint 12 is ±0.05. Preferably, the width of the first solder joint 11 is 2.5mm.

[0090] Optionally, the photovoltaic welding ribbon 10 connects the first battery and the second battery, the first welding point 11 connects to the positive electrode of the first battery, and the second welding point 12 connects to the negative electrode of the second battery, wherein the area of ​​the first welding point 11 is greater than or equal to the area of ​​the second welding point 12; or, the first welding point 11 connects to the negative electrode of the first battery, and the second welding point 12 connects to the positive electrode of the second battery, wherein the area of ​​the second welding point 12 is greater than or equal to the area of ​​the first welding point 11.

[0091] It is understandable that since the current at the positive electrode is much greater than that at the negative electrode, this allows for a larger area of ​​the solder joint corresponding to the positive electrode, making the structure of the solder strip more compatible with the current of the battery.

[0092] Specifically, the area of ​​the first solder joint 11 is greater than or equal to the area of ​​the second solder joint 12. This can be because the widths of the first solder joint 11 and the second solder joint 12 are the same, and the length of the first solder joint 11 is greater than the length of the second solder joint 12; or the lengths of the first solder joint 11 and the second solder joint 12 are the same, and the width of the first solder joint 11 is greater than the width of the second solder joint 12; or 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.

[0093] Please see Figure 3Optionally, the first slot 119 and the second slot 129 may be centrally symmetrical. This facilitates manufacturing and improves the effect of absorbing deformation. It is understood that in other embodiments, the first slot 119 and the second slot 129 may not be centrally symmetrical.

[0094] Please see Figure 3 Optionally, the first slot 119 may be axially symmetrical about the center line 111 of the first weld point 11. The second slot 129 may be axially symmetrical about the center line 121 of the second weld point 12. This facilitates manufacturing and improves the effect of absorbing deformation. It is understood that in other embodiments, the first slot 119 and the second slot 129 may not be axially symmetrical.

[0095] Please see Figure 3 Optionally, the vertex of the first slot 119 may be located on the center line 111 of the first solder joint 11. The vertex of the second slot 129 may be located on the center line 121 of the second solder joint 12. This facilitates manufacturing and improves the effect of absorbing deformation. It is understood that in other embodiments, the vertex of the first slot 119 may be offset from the center line 111 of the first solder joint 11. The vertex of the second slot 129 may be offset from the center line 121 of the second solder joint 12.

[0096] Please see Figure 3 Optionally, the depth H1 of the first groove 119 is 1mm-3.5mm. For example, it can be 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, or 3.5mm. This ensures that the depth H1 of the first groove 119 is within a suitable range, resulting in better absorption of tensile stress in the width direction of the photovoltaic ribbon 10. Preferably, the depth H1 of the first groove 119 is 2.85mm.

[0097] Optionally, the depth H2 of the second groove 129 is 1mm-3.5mm. For example, it can be 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, or 3.5mm. This ensures that the depth of the second groove 129 is within a suitable range, resulting in better absorption of tensile stress in the width direction of the photovoltaic ribbon 10. Preferably, the depth H2H1 of the second groove 129 is 2.85mm.

[0098] Specifically, the depth of the slot is the distance from the vertex of the slot to the edge of the corresponding body 101.

[0099] Specifically, in this embodiment, the depth H1 of the first groove 119 and the depth H2 of the second groove 129 are equal. This avoids the risk of breakage caused by one groove being too deep and the other too shallow. It is understood that in other embodiments, the depth H1 of the first groove 119 and the depth H2 of the second groove 129 may be different.

[0100] Optionally, the two opposite sides of the first slot 119 may be straight lines, curves, broken lines, other line types, or a combination of at least two of the aforementioned line types. The line types of the two opposite sides of the first slot 119 may be the same or different. When both opposite sides of the first slot 119 are straight lines, the inclination of the two opposite sides relative to the length direction may be the same or different; when both opposite sides of the first slot 119 are curved lines, the curvature of the two opposite sides may be the same or different.

[0101] Specifically, the two opposite sides of the first slot 119 are symmetrical about the center line of the first slot 119. The two opposite sides of the second slot 129 are symmetrical about the center line of the second slot 129. In this way, the slots are symmetrical, which not only facilitates manufacturing but also improves the effect of absorbing deformation.

[0102] Please see Figure 3 Optionally, the groove width W1 of the first slot 119 is 5mm-15mm. For example, it can be 5mm, 8mm, 10mm, 11.375mm, 13mm, or 15mm. This ensures that the groove width W1 of the first slot 119 is within a suitable range, resulting in better absorption of tensile stress in the length direction of the photovoltaic welding ribbon 10. Preferably, the groove width W1 of the first slot 119 is 11.375mm. The tolerance of the groove width W1 of the first slot 119 can be ±0.02mm.

[0103] Optionally, the groove width W2 of the second slot 129 is 5mm-15mm. For example, it can be 5mm, 8mm, 10mm, 11.375mm, 13mm, or 15mm. This ensures that the groove width W2 of the second slot 129 is within a suitable range, resulting in better absorption of tensile stress in the length direction of the photovoltaic ribbon 10. Preferably, the groove width W2 of the second slot 129 is 11.375mm. The tolerance of the groove width W2 of the second slot 129 can be ±0.02mm.

[0104] Specifically, in this embodiment, the groove width W1 of the first groove 119 and the groove width W2 of the second groove 129 are equal. This ensures that the two sides of the body 101 in the length direction have similar abilities to absorb expansion and contraction stress, avoiding structural instability caused by one groove being too deep and the other too shallow.

[0105] It is understood that in other embodiments, the slot width W1 of the first slot 119 and the slot width W2 of the second slot 129 may also be different.

[0106] Please see Figure 2Optionally, the first slot 119 includes a first slot edge 1191 and a second slot edge 1192, the first slot edge 1191 and the length direction of the body 101 are at an angle of 10°-40°, and / or the second slot edge 1192 and the length direction are at an angle of 10°-40°.

[0107] Specifically, the angle between the first groove edge 1191 and the length direction of the body 101 is, for example, 10°, 12°, 15°, 20°, 26°, 30°, 36°, or 40°. In this way, by tilting the groove edge, the distance between the two opposite sides of a groove 119 gradually increases in the direction away from the first weld point 11, and the tilt angle of the groove edge is within a suitable range, which is conducive to better absorbing expansion and contraction stress.

[0108] Furthermore, the angle between the first groove edge 1191 and the length direction of the body 101 is 20°-30°.

[0109] In this embodiment, the angle between the first groove edge 1191 and the length direction of the body 101 is 26°.

[0110] In this embodiment, the angle between the second groove edge 1192 and the length direction of the body 101 is the same as the angle between the first groove edge 1191 and the length direction of the body 101. It can be understood that this angle may be different in other embodiments.

[0111] Please note that the second groove edge 1192 is similar to the first groove edge 1191. Please refer to the description of the first groove edge 1191. To avoid redundancy, it will not be described again here.

[0112] Optionally, the second slot 129 includes a third slot edge 1291 and a fourth slot edge 1292, wherein the angle between the third slot edge 1291 and the length direction of the body is 10°-40°, and / or the angle between the fourth slot edge 1292 and the length direction is 10°-40°.

[0113] Please note that the description of the two sides of the second slot 129 can be found in the description of the two sides of the first slot 119. To avoid redundancy, it will not be repeated here.

[0114] Please see Figure 2 Optionally, the first slot 119 includes a first slot edge 1191 and a second slot edge 1192, the first slot edge 1191 and the second slot edge 1192 forming a first rounded corner 1193.

[0115] Optionally, the second slot 129 includes opposing third slot edges 1291 and fourth slot edges 1292, which form a second rounded corner 1293.

[0116] In this way, the angle change at the junction of the groove is relatively gentle, which can reduce the risk of breakage when the photovoltaic welding strip 10 pivots.

[0117] Specifically, the radius of the first fillet 1193 is 0.5mm-1.5mm. For example, it is 0.5mm, 0.8mm, 1mm, 1.2mm, or 1.5mm. This ensures that the radius of the first fillet 1193 is within a suitable range, allowing for a smoother connection between the first fillet 1193 and the first groove edge 1191 and the second groove edge 1192. Preferably, the radius of the first fillet 1193 is 1mm.

[0118] Furthermore, a first curve and a second curve can be respectively provided between the first fillet 1193 and the first groove edge 1191 and the second groove edge 1192. In this way, the curves further achieve a smooth transition between the first fillet 1193 and the two groove edges.

[0119] Specifically, the radius of the second fillet 1293 is 0.5mm-1.5mm. For example, it is 0.5mm, 0.8mm, 1mm, 1.2mm, or 1.5mm. Preferably, the radius of the second fillet 1293 is 1mm.

[0120] Furthermore, a third curve and a fourth curve can be respectively provided between the second fillet 1293 and the third groove edge 1291 and the fourth groove edge 1292. In this way, the curves further achieve a smooth transition between the second fillet 1293 and the two groove edges.

[0121] Please see Figure 2 Optionally, the first slot 119 includes a first bottom point 1194, and the second slot 129 includes a second bottom point 1294 near the first slot 119. The angle between the line connecting the first bottom point 1194 and the second bottom point 1294 and the length direction of the body 101 is 75°-90°. For example, 75°, 78°, 80°, 82°, 85°, 89°, and 90°. This minimizes the misalignment of the first bottom point 1194 and the second bottom point 1294 in the width direction, which facilitates better pivoting and thus better absorption of deformation.

[0122] Preferably, the angle between the line connecting the first bottom point 1194 and the second bottom point 1294 and the length direction of the body 101 is 90°. This aligns the first bottom point 1194 and the second bottom point 1294 in the width direction, minimizing any misalignment between them and thus maximizing the effect of absorbing deformation.

[0123] It can be understood that the line connecting the first bottom point 1194 and the second bottom point 1294 is the non-pivot line 1019 mentioned earlier. Two narrowing transition sections 1017 are formed on both sides of the non-pivot line 1019.

[0124] Please see Figure 2 Optionally, the first slot 119 includes a first bottom point 1194, the second slot 129 includes a second bottom point 1294 near the first bottom point 1194, the first weld point 11 includes a third bottom point 118 near the first bottom point 1194, and the distance between the first bottom point 1194 and the second bottom point 1294 is greater than the distance from the third bottom point 118 to the adjacent groove edge of the first bottom point 1194.

[0125] This makes the length of the pivot line 1018 less than the length of the non-pivot line 1019, thereby forming a gradient section 1017 between the pivot line 1018 and the non-pivot line 1019. When the photovoltaic ribbon 10 is subjected to stretching stress, the gradient section 1017 bends around the pivot line 1018, thereby absorbing the stretching stress.

[0126] It can be understood that the distance between the first bottom point 1194 and the second bottom point 1294 is also the length of the non-pivot line 1019. The distance from the third bottom point 118 to the adjacent groove edge of the first bottom point 1194 is also the length of the pivot line 1018.

[0127] Specifically, since the distance between the two opposite sides of the slot gradually increases in the direction away from the corresponding weld point, the gradient portion 1017 near the slot is narrower at the end near the corresponding weld point, thereby forming a pivot line 1018.

[0128] Please see Figure 2 Optionally, the first slot 119 includes a first bottom point 1194, and the body 101 forms a third rounded corner corresponding to the first bottom point 1194. Optionally, the first slot 119 includes a fourth bottom point 1195, and the body 101 forms a fourth rounded corner corresponding to the fourth bottom point 1195. Optionally, the second slot 129 includes a second bottom point 1294, and the body 101 forms a fifth rounded corner corresponding to the second bottom point 1294. Optionally, the second slot 129 includes a fifth bottom point 1295, and the body 101 forms a sixth rounded corner corresponding to the fifth bottom point 1295.

[0129] In this way, the angle change at the junction of the groove edge and the edge of the body 101 is relatively gentle, which can reduce the risk of breakage when the photovoltaic welding strip 10 pivots.

[0130] Specifically, the radius of the third fillet is 0.1mm-1mm. For example, it is 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1mm. Preferably, the radius of the third fillet is 0.5mm.

[0131] Specifically, the radius of the fourth fillet is 0.1mm-1mm. For example, it is 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1mm. Preferably, the radius of the fourth fillet is 0.5mm.

[0132] Specifically, the radius of the fifth fillet is 0.1mm-1mm. For example, it is 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1mm. Preferably, the radius of the fifth fillet is 0.5mm.

[0133] Specifically, the radius of the sixth fillet is 0.1mm-1mm. For example, it is 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1mm. Preferably, the radius of the sixth fillet is 0.5mm.

[0134] This ensures that the radii of each fillet are within a suitable range, allowing for a smoother connection between the groove edge and the edge of the body 101.

[0135] In this embodiment, the radii of the third, fourth, fifth, and sixth rounded corners are all the same. This facilitates manufacturing and improves production efficiency. In other embodiments, the radii of the third, fourth, fifth, and sixth rounded corners may be partially the same or completely different.

[0136] Furthermore, curves can be provided between each rounded corner and the body 101. In this way, the curves further achieve a smooth transition between the rounded corners and the edges of the body 101.

[0137] Please see Figure 4 The battery string 100 of this application embodiment includes a plurality of solar cells and a photovoltaic ribbon 10 as described above, wherein the photovoltaic ribbon 10 connects at least two solar cells.

[0138] In the battery string 100 of this application embodiment, since the distance between the two opposite sides of the slot in the photovoltaic ribbon 10 gradually increases in the direction away from the solder point, the deformation of the photovoltaic ribbon 10 can better absorb the expansion and contraction stress, thereby minimizing the damage of stress to the solar cell.

[0139] For further explanations and elaborations on this section, please refer to the preceding text. To avoid redundancy, they will not be repeated here.

[0140] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic solder strip, characterized by, The utility model relates to a kind of welding points, including: Main body; Multiple first welding points and multiple second welding points are located at the two sides of the main body in width direction respectively; Each first welding point extends outward from one side of the main body; Each second welding point extends outward from the other side of the main body; The center line of the first welding point and the second welding point is staggered in the width direction of the main body; First slot corresponding to the first welding point is formed in the main body, and the distance between two opposite sides of the first slot gradually increases away from the first welding point; And / or, second slot corresponding to the second welding point is formed in the main body, and the distance between two opposite sides of the second slot gradually increases away from the second welding point.

2. The photovoltaic solder strip of claim 1, wherein, The first slot includes a first bottom point, the second slot includes a second bottom point close to the first bottom point, the first welding point includes a third bottom point close to the first bottom point, and the distance between the first bottom point and the second bottom point is greater than the distance between the third bottom point and the adjacent side of the first slot.

3. The photovoltaic solder strip of claim 1, wherein, The depth of the first slot is 1mm-3.5mm; And / or, the depth of the second slot is 1mm-3.5mm.

4. The photovoltaic solder strip of claim 1, wherein, The slot width of the first slot is 5mm-15mm; And / or, the slot width of the second slot is 5mm-15mm.

5. The photovoltaic solder strip of claim 1, wherein, The first slot includes opposite first and second slot sides, and the angle between the first slot side and the length direction of the main body is 10°-40°, and / or the angle between the second slot side and the length direction is 10°-40°. And / or, the second slot includes opposite third and fourth slot sides, and the angle between the third slot side and the length direction of the main body is 10°-40°, and / or the angle between the fourth slot side and the length direction is 10°-40°.

6. The photovoltaic solder strip of claim 1, wherein, The first slot includes opposite first and second slot sides, and the first and second slot sides form a first rounded corner. And / or, the second slot includes opposite third and fourth slot sides, and the third and fourth slot sides form a second rounded corner.

7. The photovoltaic solder strip of claim 6, wherein, The radius of the first rounded corner is 0.5mm-1.5mm. And / or, the radius of the second rounded corner is 0.5mm-1.5mm.

8. The photovoltaic solder strip of claim 1, wherein, The first slot includes a first bottom point, the second slot includes a second bottom point close to the first slot, and the angle between the line connecting the first bottom point and the second bottom point and the length direction of the main body is 75°-90°.

9. The photovoltaic solder strip of claim 1, wherein, The first slot includes a first bottom point and a fourth bottom point, the main body forms a third rounded corner corresponding to the first bottom point, and / or the main body forms a fourth rounded corner corresponding to the fourth bottom point. And / or, the second slot includes a second bottom point and a fifth bottom point, the main body forms a fifth rounded corner corresponding to the second bottom point, and / or the main body forms a sixth rounded corner corresponding to the fifth bottom point.

10. The photovoltaic solder strip of claim 9, wherein, The radius of the third rounded corner is 0.1mm-1mm. And / or, the radius of the fourth rounded corner is 0.1mm-1mm. And / or, the radius of the fifth rounded corner is 0.1mm-1mm. And / or, the radius of the sixth rounded corner is 0.1mm-1mm.

11. The photovoltaic solder strip of claim 1, wherein, The width of the body is 2.3mm-6mm.

12. The photovoltaic solder strip of claim 1, wherein, The interval of the first and second soldering points in the width direction of the body is 6mm-20mm.

13. The photovoltaic solder strip of claim 1, wherein, The thickness of the photovoltaic soldering strip is 0.1mm-0.3mm.

14. The photovoltaic solder strip of claim 1, wherein, The photovoltaic soldering strip comprises a copper substrate and a tin layer coated on the copper substrate; or, the photovoltaic soldering strip comprises an aluminum substrate and a tin layer coated on the aluminum substrate; or, the photovoltaic soldering strip is an aluminum strip; or, the photovoltaic soldering strip is a tin strip.

15. The photovoltaic solder strip of claim 1, wherein, Multiple first soldering points are equidistantly distributed along the length direction of the body on one side of the body. And / or, multiple second soldering points are equidistantly distributed along the length direction of the body on the other side of the body.

16. The photovoltaic solder strip of claim 1, wherein, The first soldering point is in the shape of a rectangle, a rounded rectangle, a circle, a semicircle, or a trapezoid; and / or, the second soldering point is in the shape of a rectangle, a rounded rectangle, a circle, a semicircle, or a trapezoid.

17. The photovoltaic solder strip of claim 1, wherein, The line connecting the first soldering point and the second soldering point closest to the first soldering point forms an angle with the length direction of the soldering strip, and the angle is 20°-60°.

18. The photovoltaic solder strip of claim 1, wherein, The photovoltaic soldering strip connects a first cell and a second cell, the first soldering point connects the positive electrode of the first cell, the second soldering point connects the negative electrode of the second cell, and the area of the first soldering point is greater than or equal to the area of the second soldering point; or, the first soldering point connects the negative electrode of the first cell, the second soldering point connects the positive electrode of the second cell, and the area of the second soldering point is greater than or equal to the area of the first soldering point.

19. A battery string, characterized by The photovoltaic soldering strip of any one of claims 1-18 is used to connect at least two solar cells.

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