CN216958061U - Photovoltaic solder strip and battery string - Google Patents

Abstract

The application is suitable for the technical field of solar cells and provides a photovoltaic solder strip and a cell string. The photovoltaic solder strip comprises a body, a plurality of first solder joints and a plurality of second solder joints; the plurality of first welding points and the plurality of second welding points are respectively positioned on two sides of the body in the width direction; each first welding point extends outwards from one side of the body; each second welding point extends outwards from the other side of the body; the center lines of the first welding point and the second welding point are staggered in the width direction of the body; the photovoltaic solder strip also comprises a first slot which is formed on the body and corresponds to the first solder joint, and the distance between two opposite sides of the first slot is gradually increased towards the direction far away from the first solder joint; and/or the photovoltaic solder strip also comprises a second slot which is formed on the body and corresponds to the second welding point, and the distance between two opposite sides of the second slot is gradually increased towards the direction far away from the second welding point. Therefore, the stretching stress can be better absorbed through the deformation of the photovoltaic solder strip, and the damage of the stress to the solar cell is reduced to the minimum.

Description

Photovoltaic solder strip and battery string

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a photovoltaic solder strip and a battery string.

Background

The solar cell power generation utilizes the photovoltaic effect of the semiconductor p-n junction to convert sunlight into electric energy, and is a sustainable source of clean energy.

The related art generally connects a plurality of solar cells into a whole using solder ribbons, and thus packages the solar cells into a cell module through a process of laying, laminating, or the like. However, the thermal mismatch between the solder strip and the solar cell, i.e. the proportionality coefficient of expansion with heat and contraction with cold with temperature change is different, so that the stress between the solar cell and the solder strip is too large, thereby causing the solar cell to crack and fragment. The thermal expansion and contraction of the solder strip can also subject the battery to the stretching stress of the solder strip, thereby causing the solar battery to crack and fragment.

Therefore, how to design the solder strip to reduce the damage of the solar cell caused by stress becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The application provides a photovoltaic solder strip and a battery string, aiming at solving the problem of how to design the solder strip to reduce the stress damage of a solar battery.

In a first aspect, the present application provides a photovoltaic solder strip, including:

a body;

the first welding spots and the second welding spots are respectively positioned on two sides of the body in the width direction;

each first welding point extends outwards from one side of the body;

each second welding point extends outwards from the other side of the body;

the center lines of the first welding spot and the second welding spot are staggered in the width direction of the body;

the first open groove is formed in the body and corresponds to the first welding point, and the distance between two opposite sides of the first open groove is gradually increased towards the direction far away from the first welding point;

and/or a second slot formed in the body and corresponding to the second welding point, wherein the distance between two opposite sides of the second slot gradually increases towards the direction away from the second welding point.

Optionally, 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 a distance between the first bottom point and the second bottom point is greater than a distance between the third bottom point and an adjacent slot edge of the first bottom point.

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

Optionally, the width of the notch of the first slot is 5mm-15 mm; and/or the width of the notch of the second groove is 5mm-15 mm.

Optionally, the first slot includes a first slot edge and a second slot edge which are opposite to each other, an included angle between the first slot edge and the length direction of the body is 10 ° to 40 °, and/or an included angle between the second slot edge and the length direction is 10 ° to 40 °; and/or the second slot comprises a third slot side and a fourth slot side which are opposite, the included angle between the third slot side and the length direction of the body is 10-40 degrees, and/or the included angle between the fourth slot side and the length direction is 10-40 degrees.

Optionally, the first slot comprises a first slot edge and a second slot edge that are opposite, the first slot edge and the second slot edge forming a first rounded corner; and/or the second slot comprises a third slot edge and a fourth slot edge which are opposite, and the third slot edge and the fourth slot edge form a second fillet.

Optionally, the radius of the first rounded corner is 0.5mm-1.5 mm; and/or the radius of the second round angle is 0.5mm-1.5 mm.

Optionally, the first slot includes a first bottom point, the second slot includes a second bottom point close to the first slot, and an included angle formed between a connecting line of the first bottom point and the second bottom point and the length direction of the body is 75 ° to 90 °.

Optionally, the first slot includes a first bottom point and a fourth bottom point, the body is formed with a third rounded corner corresponding to the first bottom point, and/or the body is formed with a fourth rounded corner corresponding to the fourth bottom point;

and/or the second slot comprises a second bottom point and a fifth bottom point, the body is provided with a fifth round angle corresponding to the second bottom point, and/or the body is provided with a sixth round angle corresponding to the fifth bottom point.

Optionally, the radius of the third fillet is 0.1mm-1 mm; and/or the radius of the fourth round angle is 0.1mm-1 mm; and/or the radius of the fifth round angle is 0.1mm-1 mm; and/or the radius of the sixth round angle is 0.1mm-1 mm.

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

Optionally, the distance between the adjacent first welding points and the second welding points in the width direction of the body is 6mm-20 mm.

Optionally, the thickness of the photovoltaic solder strip is 0.1mm-0.3 mm.

Optionally, the photovoltaic solder strip comprises a copper substrate and a tin layer coated on the copper substrate; or, the photovoltaic solder strip comprises 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.

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

and/or the second welding points are distributed on the other side of the body at equal intervals along the length direction of the body.

Optionally, the first welding spot is rectangular, rounded rectangular, circular, semicircular or trapezoidal; and/or the second welding points are rectangular, rounded rectangular, circular, semicircular and trapezoidal.

Optionally, a connecting line between the first welding point and the second welding point closest to the first welding point forms an included angle with the length direction of the welding strip, and the included angle is 20-60 degrees.

Optionally, the photovoltaic solder strip is connected with a first battery and a second battery, the first welding point is connected with the anode of the first battery, the second welding point is connected with the cathode of the second battery, and the area of the first welding point is larger than or equal to that of the second welding point; or the first welding point is connected with the negative electrode of the first battery, the second welding point is connected with the positive electrode of the second battery, and the area of the second welding point is larger than or equal to that of the first welding point.

In a second aspect, the present application provides a cell string including a plurality of solar cells and a photovoltaic solder ribbon of any one of the above, the photovoltaic solder ribbon connecting at least two of the solar cells.

In the photovoltaic solder strip and the battery string of the embodiment of the application, as the distance between two opposite sides of the groove gradually increases towards the direction away from the welding point, the telescopic stress can be better absorbed through the deformation of the photovoltaic solder strip, and then the damage of the stress to the solar battery is reduced to the lowest.

Drawings

Fig. 1 is a schematic structural diagram of a photovoltaic solder ribbon according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a partial structure of a photovoltaic solder strip in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of a partial structure of a photovoltaic solder strip in accordance with an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery string according to an embodiment of the present application.

Description of the main element symbols:

photovoltaic solder strips 10, body 101, transition 1017, pivot line 1018, non-pivot line 1019; the first welding point 11, the center line 111 of the first welding point, the third bottom point 118, the first slot 119, the first slot edge 1191, the second slot edge 1192, the first rounded corner 1193, the first bottom point 1194, and the fourth bottom point 1195;

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

the width w0 of the body, the length L0 of the body, the distance S0 between the adjacent first welding point and the second welding point in the width direction of the body, the depth H1 of the first groove and the depth H2 of the second groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1 and 2, a photovoltaic solder ribbon 10 according to an embodiment of the present disclosure includes a body 101, a plurality of first solder joints 11, and a plurality of second solder joints 12. The plurality of first pads 11 and the plurality of second pads 12 are respectively located at both sides of the body 101 in the width direction. Each first welding point 11 extends outward from one side of the body 101. Each of the second pads 12 extends outward from the other side of the body 101. The center lines of the first welding point 11 and the second welding point 12 are offset in the width direction of the body 101. The photovoltaic solder strip 10 further comprises a first open groove 119 formed in the body 101 and corresponding to the first solder joint 11, and the distance between two opposite sides of the first open groove 119 gradually increases towards the direction away from the first solder joint 11; and/or, the photovoltaic solder strip 10 further comprises a second slot 129 formed in the body 101 and corresponding to the second solder joint 12, and the distance between two opposite sides of the second slot 129 is gradually increased towards the direction away from the second solder joint 12.

The photovoltaic solder strip 10 of the embodiment of the application has the advantages that the distance between the two opposite sides of the groove is gradually increased towards the direction away from the welding point, so that the telescopic stress can be better absorbed through the deformation of the photovoltaic solder strip 10, and further the damage of the stress to the solar cell is reduced to the minimum.

It is understood that the solder ribbon 10 absorbs the stress in the length direction, the width direction, and the thickness direction by deformation.

Note that the body 101 is formed with the first slot 119 and/or the second slot 129 includes three cases: in the first case, the body 101 is formed with a first slot 119 and a second slot 129, as shown in fig. 1 and 2; in the second case, the body 101 is formed with the first slot 119 and not with the second slot 129; in the third case, the body 101 is formed with the second slot 129 and is not formed with the first slot 119. For convenience of explanation, the following description will be given taking the case where the body 101 is formed with the first slot 119 and the second slot 129, but this does not represent a limitation to the foregoing.

Please note that, the distance between the two opposite sides of the slot gradually increases towards the direction away from the corresponding welding point, and both the two opposite sides of the slot form an acute angle or an obtuse angle with the length direction; or one opposite side of the slot forms an acute angle with the length direction, and the other opposite side forms a right angle with the length direction.

Referring to fig. 2, specifically, since the distance between the two opposite sides of the first slot 119 and the second slot 129 gradually increases toward the direction away from the welding point, two gradually changing portions 1017 that shrink and narrow may be formed between the adjacent first welding point 11 and the second welding point 12, the boundary end of the two gradually changing portions 1017 is the non-pivot line 1019, and the non-boundary end of the two gradually changing portions 1017 is the pivot line 1018. In this manner, in the event that the photovoltaic solder ribbon 10 is subjected to a stretching stress, the pivot line 1018 is arched, i.e., bent at the pivot line 1018, thereby absorbing the stretching stress and minimizing the damage to the solar cell by the stress.

It can be understood that in the case that the body 101 is formed with the first slot 119 and not formed with the second slot 129, a tapered portion 1017 that narrows is formed between the adjacent first and second welding points 11 and 12, and the narrowest end of the tapered portion 1017 is adjacent to the first welding point 11 and is formed with the pivot line 1018.

Similarly, in the case that the body 101 is formed with the second slot 129 and the first slot 129 is not formed, a tapered portion 1017 which narrows is formed between the adjacent first welding point 11 and the second welding point 12, and the narrowest end of the tapered portion 1017 is close to the second welding point 12 and is formed with the pivot line 1018.

Specifically, the non-pivot line 1019 corresponds to a larger cross-sectional area than the pivot line 1018. The cross section is formed by cutting in the thickness direction of the photovoltaic solder ribbon 10. In this manner, the solder strip is made to bend more easily at the pivot line 1018, thereby making it more effective in absorbing the stretching stress.

Specifically, the thickness of the photovoltaic solder strip 10 corresponding to the pivot line 1018 is smaller than the thickness of the photovoltaic solder strip 10 corresponding to the non-pivot line 1019. As such, the gradual portion 1017 is caused to better bend about the pivot line 1018, thereby making the effect of absorbing the expansion and contraction stress better.

Specifically, the first solder joints 11 and the second solder joints 12 may have different shapes. It can be understood that the photovoltaic solder strip 10 can be made to be asymmetric by the different shapes of the solder points on the two sides or the staggered center lines.

It can be appreciated that the welds on both sides of the body 101 are offset, allowing a longer body 101 between the welds to absorb the amount of stress deformation, better absorbing tensile and torsional deformations. Also, a slotted space may be provided for the first slot 119 and the second slot 129 formed between the first pad 11 and the second pad 12.

It is understood that "the center lines of the first welding points 11 and the second welding points 12 are staggered in the width direction of the body 101", may be the center lines of a group of adjacent first welding points 11 and second welding points 12, which are staggered in the width direction of the body 101; the center lines of a plurality of groups of adjacent first welding points 11 and second welding points 12 are staggered in the width direction of the body 101, and the center lines of the rest adjacent first welding points 11 and second welding points 12 are overlapped in the width direction of the body 101; the center lines of all the adjacent first welding points 11 and second welding points 12 may be offset in the width direction of the body 101. The last case is illustrated and described herein by way of example, but this is not meant to be a limitation of the above case.

Note that each set of adjacent first pads 11 is offset from the second pads 12, and may form a first slot 119 and/or a second slot 129. In the case where there are a plurality of sets of adjacent first pads 11 and second pads 12 that are offset, a plurality of slots may be formed, or only one slot may be formed.

It is understood that "offset in the width direction of the body 101" means not overlapping in the width direction.

It is understood that the center line 111 of the first weld is a line passing through the center of the first weld 11 and parallel to the width direction. The center line 121 of the second weld 12 is a line passing through the center of the second weld 12 and parallel to the width direction.

Referring to fig. 3, optionally, a connection line between the first welding point 11 and the second welding point 12 closest to the first welding point 11 forms an included angle γ of 20 ° to 60 ° with the length direction of the solder ribbon 10. In this way, the first welding point 11 and the second welding point 12 are properly staggered, so that a slotted space can be provided for the first slot 119 and the second slot 129 formed between the first welding point 11 and the second welding point 12, which is beneficial to better absorbing the stretching stress through the deformation of the welding strip 10, and further, the damage of the stress to the battery is reduced to the minimum.

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

Further, the included angle gamma is 20-40 deg. In this way, the offset degree between the first welding point 11 and the second welding point 12 is more suitable, and the slotting is more convenient.

Preferably, γ is 23 °. In this way, the first welding points 11 and the second welding points 12 are optimally staggered.

Optionally, the photovoltaic solder strip 10 has a thickness of 0.1mm to 0.3 mm. For example, 0.1mm, 0.12mm, 0.14mm, 0.18mm, 0.2mm, 0.21mm, 0.25mm, 0.27mm, 0.3 mm. Therefore, the thickness of the photovoltaic solder strip 10 is within a proper range, the poor effect of the photovoltaic solder strip 10 on absorbing the stretching stress or the poor mechanical strength of the photovoltaic solder strip 10 caused by the over-small thickness can be avoided, and the high cost of the photovoltaic solder strip 10 caused by the over-large thickness of the photovoltaic solder strip 10 can also be avoided.

Preferably, the thickness of the photovoltaic solder strip 10 is 0.14 mm. Therefore, the effect of the photovoltaic solder strip 10 on absorbing the stretching stress, the mechanical strength and the cost are considered, and the overall effect is best.

Alternatively, the photovoltaic solder ribbon 10 includes a copper substrate and a tin layer coated on the copper substrate. Thus, the photovoltaic solder strip 10 has good conductivity, so that the effect of electrically connecting the solar cells is good.

Specifically, the hardness of the photovoltaic solder strip 10 ranges from 40HV to 60 HV. Examples thereof include 40HV, 42HV, 45HV, 48HV, 50HV, 53HV, 55HV, 59HV and 60 HV. Thus, the photovoltaic solder strip 10 has good mechanical strength.

Specifically, the uniformity of the tin layer was ± 10%. For example, -10%, -8%, -5%, -2%, 0%, 1%, 5%, 7%, 10%. Thus, the photovoltaic solder strip 10 has good conductivity.

Specifically, the tin layer has a thickness of 6 μm to 10 μm. Examples thereof include 6 μm, 6.2 μm, 7 μm, 7.5 μm, 8 μm, 9 μm and 10 μm.

In other embodiments, the photovoltaic solder strip 10 may also include an aluminum substrate and a tin layer coated on the aluminum substrate; or, the photovoltaic solder strip 10 is an aluminum strip; alternatively, the photovoltaic solder strip 10 is a tin strip.

Optionally, the elongation of the photovoltaic solder strip 10 is greater than or equal to 25%. For example, 25%, 27%, 30%, 35%.

Referring to fig. 1, the width w0 of the body 101 is optionally 2.3mm-6 mm. For example, 2.3mm, 2.4mm, 2.8mm, 3mm, 3.35mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.8mm, 6 mm. Therefore, the width w0 of the body 101 is in a proper range, so that the poor effect of the photovoltaic solder strip 10 in absorbing the stretching stress or the difficulty of the photovoltaic solder strip 10 in connecting a solar cell due to the fact that the width w0 of the body 101 is too small can be avoided, and the high cost of the photovoltaic solder strip 10 due to the fact that the width w0 of the body 101 is too large can also be avoided. The tolerance for the width w0 of the body 101 may be ± 0.1 mm.

Preferably, the width w0 of the body 101 is 3.35 mm. Therefore, the effect of the photovoltaic solder strip 10 for absorbing the stretching stress is taken into consideration, the solar cell is connected, the cost is realized, and the overall effect is best.

Referring to fig. 1, the length L0 of the body 101 is optionally 170mm-220 mm. For example 170mm, 176mm, 180mm, 182mm, 210mm, 218mm, 220 mm. The tolerance for the length L0 of the body 101 may be ± 0.1 mm.

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

Referring to fig. 1, optionally, each first welding point 11 extends outward from one side of the body 101 along the width direction of the body 101. Each of the second pads 12 extends outward from the other side of the body 101 in the width direction of the body 101. Therefore, the first welding points 11 and the second welding points 12 are regularly arranged, and manufacturing is facilitated.

It is understood that, in other embodiments, the direction in which each first welding point 11 extends outward from one side of the body 101 may form an acute angle or an obtuse angle with the width direction of the body 101; part of the first welding points 11 extend outwards from one side of the body 101 along the width direction of the body 101, and the direction in which the rest of the first welding points 11 extend outwards from one side of the body 101 forms an acute angle or an obtuse angle with the width direction of the body 101; the direction of each second welding point 12 extending outwards from one side of the body 101 and the width direction of the body 101 form an acute angle or an obtuse angle; some of the second welding points 12 may extend outward from one side of the body 101 along the width direction of the body 101, and the direction in which the rest of the second welding points 12 extend outward from one side of the body 101 forms an acute angle or an obtuse angle with the width direction of the body 101. Specifically, when the first welding points 11 form acute angles or obtuse angles with the width direction of the body 101, the angles formed by the first welding points 11 may be the same or different; when the second welding points 12 form acute angles or obtuse angles with the width direction of the body 101, the angles formed by the second welding points 12 may be the same or different.

Referring to fig. 1, optionally, a plurality of first solder joints 11 are distributed on one side of the body 101 at equal intervals along the length direction of the body 101. Optionally, the second welding points 12 are distributed on the other side of the body 101 at equal intervals along the length direction of the body 101. Therefore, the body 101 between each section of the first welding point 11 and the second welding point 12 has the same capability of absorbing the stretching stress, which is beneficial to further reducing the damage to the solar cell. Meanwhile, the arrangement of the welding spots is regular, the manufacturing is convenient, and the staggering of the central lines of the adjacent welding spots is also convenient to ensure.

Specifically, the distance between adjacent first welding points 11 and second welding points 12 may be equal to the distance between two adjacent first welding points 11 and the distance between two adjacent second welding points 12. In other words, the two adjacent solder joints are equally spaced. For example, for a cell with a side length of 182mm, the first welding points 11 can be 5-15, the second welding points 12 can be 5-15, and the distance between two adjacent welding points can be 6m-20 mm.

In other embodiments, the intervals between two adjacent first welding points 11 may be different; the distances between some adjacent two first welding points 11 are the same, and the distances between the other adjacent two first welding points 11 are different; similarly, the intervals between two adjacent second welding points 12 may all be different; the pitch between some adjacent second welding points 12 may be the same, and the pitch between the other adjacent second welding points 12 may be different. The specific arrangement of the solder joints is not limited herein.

Referring to fig. 3, the distance S0 between adjacent first welding points 11 and second welding points 12 in the width direction of the body 101 is optionally 6mm-20 mm. For example 6mm, 6.5mm, 8mm, 10mm, 11.375mm, 13mm, 15mm, 18mm, 20 mm. Further, the distance S0 between the adjacent first welding point 11 and second welding point 12 in the width direction of the body 101 is 10mm to 15 mm. For example 10mm, 11.375mm, 13mm, 15 mm. Therefore, the S0 is in a proper range, poor effect of absorbing the stretching stress caused by poor deformability due to too large or too small S0 is avoided, and damage of the stress to the solar cell is reduced. The tolerance of spacing S0 may be 0.02.

Preferably, the distance S0 between the adjacent first welding points 11 and second welding points 12 in the width direction of the body 101 is 11.375 mm. Thus, the best effect of reducing the damage of the solar cell caused by the stress is achieved.

Optionally, the first solder joints 11 are rectangular, rounded rectangular, circular, semicircular, trapezoidal. Optionally, the second solder joints 12 are rectangular, rounded rectangular, circular, semicircular, trapezoidal.

Specifically, in the examples of fig. 1, 2, and 3, the plurality of first pads 11 and the plurality of second pads 12 each have a rounded rectangular shape. Further, the radius of the fillet is 0.2mm-0.4 mm. For example, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.31mm, 0.35mm, 0.39mm, 0.4 mm. Preferably, the radius of the fillet is 0.3 mm.

It is understood that in other examples, the shapes of the first welding points 11 and the second welding points 12 may be different; the shapes of some of the first welding points 11 may be the same, and different from the shapes of the rest of the first welding points 11, or the shapes of all the first welding points 11 may be different; the shapes of some of the second welding points 12 may be the same, different from the shapes of the rest of the second welding points 12, or the shapes of all the second welding points 12 may be different.

Optionally, the length of the first welding point 11 extending from the body 101 is 1.5mm to 1.7 mm. For example, 1.5mm, 1.52mm, 1.55mm, 1.6mm, 1.63mm, 1.65mm, 1.68mm, 1.7 mm. The tolerance of the length of the first solder 11 protruding from the body 101 is ± 0.05. Preferably, the length of the first welding point 11 extending from the body 101 is 1.6 mm.

Optionally, the width of the first solder joints 11 is 2.4mm-2.6 mm. For example, 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, 2.6 mm. The tolerance of the width of the first solder joint 11 is ± 0.05. Preferably, the width of the first spot welds 11 is 2.5 mm.

Optionally, the length of the second welding points 12 extending from the body 101 is 0.8mm to 1.1 mm. For example, 0.8mm, 0.82mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1 mm. The tolerance of the length of the first solder 11 protruding from the body 101 is ± 0.05. Preferably, the length of the first welding point 11 extending from the body 101 is 0.95 mm.

Optionally, the width of the second solder joints 12 is 2.4mm-2.6 mm. For example, 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, 2.6 mm. The tolerance of the width of the second solder joint 12 is ± 0.05. Preferably, the width of the first spot welds 11 is 2.5 mm.

Optionally, the photovoltaic solder strip 10 is connected with a first battery and a second battery, the first solder joint 11 is connected with the anode of the first battery, the second solder joint 12 is connected with the cathode of the second battery, and the area of the first solder joint 11 is larger than or equal to the area of the second solder joint 12; or the first welding point 11 is connected with the cathode of the first battery, the second welding point 12 is connected with the anode of the second battery, and the area of the second welding point 12 is larger than or equal to that of the first welding point 11.

It can be understood that, because the current of the positive electrode is larger than that of the negative electrode, the area of the welding point corresponding to the positive electrode can be larger, and the structure of the welding strip is more matched with the current of the battery.

Specifically, the area of the first solder joint 11 is greater than or equal to the area of the second solder joint 12, which may be the same width of the first solder joint 11 and the second solder joint 12, and the length of the first solder joint 11 is greater than the length of the second solder joint 12; the lengths of the first welding point 11 and the second welding point 12 can be the same, and the width of the first welding point 11 is greater than that of the second welding point 12; it is also possible that the length of the first solder 11 is greater than the length of the second solder 12 and the width of the first solder 11 is greater than the width of the second solder 12.

Referring to fig. 3, the first slot 119 and the second slot 129 may be symmetric. Therefore, the manufacturing is convenient, and the effect of absorbing deformation is better. It is understood that in other embodiments, the first slot 119 and the second slot 129 may not be centrosymmetric.

Referring to fig. 3, the first slot 119 may be axially symmetric with respect to the center line 111 of the first solder 11. The second slot 129 may be axisymmetrical about the centerline 121 of the second weld 12. Therefore, the manufacturing is convenient, and the deformation absorption effect is better. It is understood that in other embodiments, the first slot 119 and the second slot 129 may not be axially symmetric.

Referring to fig. 3, alternatively, the vertex of the first slot 119 may be located on the center line 111 of the first welding point 11. The apex of the second slot 129 may be located on the centerline 121 of the second weld 12. Therefore, the manufacturing is convenient, and the deformation absorption effect is better. It is understood that in other embodiments, the apex of the first slot 119 can be offset from the centerline 111 of the first weld 11. The apex of the second slot 129 may be offset from the centerline 121 of the second weld 12.

Referring to fig. 3, the depth H1 of the first slot 119 is optionally 1mm to 3.5 mm. For example, 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, 3.5 mm. In this way, the depth H1 of the first slot 119 is in a proper range, so that the photovoltaic solder strip 10 has a better effect of absorbing the stretching stress in the width direction. Preferably, the depth H1 of the first slot 119 is 2.85 mm.

Optionally, the depth H2 of the second slot 129 is 1mm to 3.5 mm. For example, 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, 3.5 mm. Thus, the depth of the second groove 129 is in a proper range, and the effect of the photovoltaic solder strip 10 on absorbing the stretching stress in the width direction is better. Preferably, the depth H2H1 of the second slot 129 is 2.85 mm.

Specifically, the depth of the slot is the distance from the vertex of the slot to the corresponding side line of the body 101.

Specifically, in the present embodiment, the depth H1 of the first slot 119 and the depth H2 of the second slot 129 are equal. Thus, easy breakage caused by over-deep grooving and over-shallow grooving of one groove is avoided. It is understood that the depth H1 of the first slot 119 and the depth H2 of the second slot 129 may be different in other embodiments.

Alternatively, the two opposite sides of the first slot 119 may be straight, curved, broken, other linear, or a combination of at least two of the foregoing linear. The line type of the two opposite sides of the first slot 119 may be the same or different. In the case that both opposite sides of the first open groove 119 are straight, the inclination degrees of the two opposite sides in comparison with the length direction may be the same or different; in the case that both opposite sides of the first slot 119 are curved, the curved degrees of the opposite sides may be the same or different.

Specifically, two opposite sides of the first slot 119 may be symmetrical with respect to a center line of the first slot 119. The two opposite sides of the second slot 129 may be symmetrical with respect to the center line of the second slot 129. Therefore, the slots are symmetrical, so that the manufacturing is convenient, and the effect of absorbing deformation is better.

Referring to fig. 3, the width W1 of the first slot 119 is optionally 5mm-15 mm. For example 5mm, 8mm, 10mm, 11.375mm, 13mm, 15 mm. Thus, the notch width W1 of the first notch 119 is in a proper range, so that the photovoltaic solder strip 10 has a better effect of absorbing the stretching stress in the length direction. Preferably, the slot width W1 of the first slot 119 is 11.375 mm. The tolerance of the slot width W1 of the first slot 119 may be ± 0.02 mm.

Optionally, the slot width W2 of the second slot 129 is 5mm-15 mm. For example 5mm, 8mm, 10mm, 11.375mm, 13mm, 15 mm. In this way, the notch width W2 of the second notch 129 is in a proper range, so that the photovoltaic solder strip 10 has a better effect of absorbing the stretching stress in the length direction. Preferably, the slot width W2 of the second slot 129 is 11.375 mm. The tolerance of the slot width W2 of the second slot 129 may be ± 0.02 mm.

Specifically, in the present embodiment, the notch width W1 of the first slot 119 and the notch width W2 of the second slot 129 are equal. Therefore, the two sides of the body 101 in the length direction have similar capabilities of absorbing the stretching stress, and the unstable structure caused by that one open groove is too deep and the other open groove is too shallow is avoided.

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 be different.

Referring to fig. 2, optionally, the first slot 119 includes a first slot edge 1191 and a second slot edge 1192 opposite to each other, the first slot edge 1191 forms an angle of 10 ° to 40 ° with the length direction of the body 101, and/or the second slot edge 1192 forms an angle of 10 ° to 40 ° with the length direction.

Specifically, the angle between the first slot edge 1191 and the length direction of the body 101 is, for example, 10 °, 12 °, 15 °, 20 °, 26 °, 30 °, 36 °, 40 °. Therefore, the distance between two opposite sides of one slot 119 is gradually increased towards the direction far away from the first welding point 11 by the inclination of the slot side, and the inclination angle of the slot side is in a proper range, which is beneficial to better absorbing the stretching stress.

Further, the angle between the first slot edge 1191 and the length direction of the body 101 is 20 ° to 30 °.

In this embodiment, the angle between the first slot edge 1191 and the longitudinal direction of the body 101 is 26 °.

In this embodiment, the angle between the second slot edge 1192 and the longitudinal direction of the body 101 is the same as the angle between the first slot edge 1191 and the longitudinal direction of the body 101. It is understood that in other embodiments, this may be different.

Please note that the second slot edge 1192 is similar to the first slot edge 1192, and reference may be made to the description of the first slot edge 1191 for avoiding redundancy, which is not described herein again.

Optionally, the second slot 129 includes third and fourth opposing slot edges 1291 and 1292, the third slot edge 1291 being angled from 10 ° to 40 ° and/or the fourth slot edge 1292 being angled from 10 ° to 40 ° with respect to the length of the body.

Please note that, the descriptions of the two slot edges of the second slot 129 can refer to the descriptions of the two slot edges of the first slot 119, and are not repeated herein for avoiding redundancy.

Referring to fig. 2, optionally, the first slot 119 includes a first slot edge 1191 and a second slot edge 1192 opposite to each other, and the first slot edge 1191 and the second slot edge 1192 form a first rounded corner 1193.

Optionally, the second slot 129 includes third and fourth opposing slot edges 1291 and 1292, the third and fourth slot edges 1291 and 1292 forming a second rounded corner 1293.

Thus, the angle change at the joint of the groove edges is gentle, and the risk of breakage of the photovoltaic solder strip 10 during pivoting can be reduced.

Specifically, the radius of the first rounded corners 1193 is 0.5mm to 1.5 mm. For example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5 mm. In this way, the radius of the first rounded corner 1193 is within a suitable range, so that the first rounded corner 1193 is smooth when connecting the first slot edge 1191 and the second slot edge 1192. Preferably, the radius of the first rounded corners 1193 is 1 mm.

Further, a first curve and a second curve may be respectively disposed between the first rounded corner 1193 and the first slot edge 1191 and the second slot edge 1192. In this manner, a smooth transition of the first rounded corner 1193 and the two groove edges is further achieved by the curve.

Specifically, the radius of the second rounded corner 1293 is between 0.5mm and 1.5 mm. For example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5 mm. Preferably, the second rounded corner 1293 has a radius of 1 mm.

Further, a third curve and a fourth curve may be respectively disposed between the second rounded corner 1293 and the third slot edge 1291 and the fourth slot edge 1292. In this manner, a smooth transition of the second fillet 1293 and the two groove flanks is further achieved by the curve.

Referring to fig. 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 slot 119, and a connecting line between the first bottom point 1194 and the second bottom point 1294 forms an angle of 75 ° to 90 ° with the length direction of the body 101. For example 75 °, 78 °, 80 °, 82 °, 85 °, 89 °, 90 °. In this manner, the first bottom point 1194 and the second bottom point 1294 are displaced to a lesser extent in the width direction, which facilitates better pivoting and thus better absorption of deformation.

Preferably, a line connecting the first bottom point 1194 and the second bottom point 1294 forms an angle of 90 ° with the length direction of the body 101. Thus, the first bottom point 1194 and the second bottom point 1294 are aligned in the width direction, and the misalignment of the first bottom point 1194 and the second bottom point 1294 in the width direction is minimized, thereby maximizing the effect of absorbing deformation.

It will be appreciated that the line connecting the first bottom point 1194 and the second bottom point 1294 is also referred to above as the non-pivot line 1019. Two shrinkage-narrowing gradually-changing portions 1017 are formed on both sides of the non-pivot line 1019.

Referring to fig. 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 a distance between the first bottom point 1194 and the second bottom point 1294 is greater than a distance from the third bottom point 118 to an adjacent slot edge of the first bottom point 1194.

As such, the length of the pivot line 1018 is made smaller than the length of the non-pivot line 1019, thereby forming a gradual change 1017 between the pivot line 1018 and the non-pivot line 1019, such that in the event that the photovoltaic solder strip 10 is subjected to a stretching stress, the gradual change 1017 bends around the pivot line 1018, thereby absorbing the stretching stress.

It will be appreciated that the first bottom point 1194 is spaced from the second bottom point 1294 by a distance that is not the length of the pivot line 1019. The distance from the third bottom point 118 to the adjacent trough edge of the first bottom point 1194 is also the length of the pivot line 1018.

Specifically, since the distance between two opposite sides of the slot gradually increases toward the direction away from the corresponding welding point, the gradual change portion 1017 near the slot is narrower at the end near the corresponding welding point, so that the pivot line 1018 can be formed.

Referring to fig. 2, optionally, the first slot 119 includes a first bottom point 1194, and the body 101 is formed with 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 is formed with 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 is formed with 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 is formed with a sixth rounded corner corresponding to the fifth bottom point 1295.

Therefore, the angle change of the joint of the groove edge and the side line of the body 101 is gentle, and the risk of fracture of the photovoltaic solder strip 10 during pivoting can be reduced.

Specifically, the radius of the third round angle is 0.1mm-1 mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1 mm. Preferably, the radius of the third rounded corner is 0.5 mm.

Specifically, the radius of the fourth round corner is 0.1mm-1 mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1 mm. Preferably, the radius of the fourth fillet is 0.5 mm.

Specifically, the radius of the fifth round corner is 0.1mm-1 mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1 mm. Preferably, the radius of the fifth rounded corner is 0.5 mm.

Specifically, the radius of the sixth round corner is 0.1mm-1 mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1 mm. Preferably, the radius of the sixth fillet is 0.5 mm.

Therefore, the radius of each round angle is in a proper range, and the groove edge can be smoothly connected with the side line of the body 101.

In the present embodiment, the radii of the third fillet, the fourth fillet, the fifth fillet and the sixth fillet are all the same. Therefore, the manufacturing is convenient, and the production efficiency is improved. In other embodiments, the radii of the third fillet, the fourth fillet, the fifth fillet and the sixth fillet may be partially the same or all different.

Furthermore, curves can be respectively arranged between each round angle and the body 101. In this way, a smooth transition between the fillet and the edge of the body 101 is further achieved by the curve.

Referring to fig. 4, a cell string 100 according to an embodiment of the present application includes a plurality of solar cells and the photovoltaic solder ribbon 10 according to any one of the above embodiments, and the photovoltaic solder ribbon 10 connects at least two solar cells.

According to the cell string 100 provided by the embodiment of the application, the distance between two opposite sides of the groove is gradually increased towards the direction away from the welding point in the photovoltaic solder strip 10, so that the telescopic stress can be better absorbed through the deformation of the photovoltaic solder strip 10, and further the damage of the stress to the solar cell is reduced to the minimum.

For further explanation and explanation of this section, reference is made to the foregoing description, and further explanation is omitted here to avoid redundancy.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (19)

1. A photovoltaic solder ribbon, comprising:

a body;

the first welding spots and the second welding spots are respectively positioned on two sides of the body in the width direction;

each first welding point extends outwards from one side of the body;

each second welding point extends outwards 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 first open groove is formed in the body and corresponds to the first welding point, and the distance between two opposite sides of the first open groove is gradually increased towards the direction far away from the first welding point;

and/or a second slot formed in the body and corresponding to the second welding point, wherein the distance between two opposite sides of the second slot gradually increases towards the direction away from the second welding point.

2. The photovoltaic solder ribbon of claim 1, wherein the first trench includes a first bottom point, the second trench includes a second bottom point adjacent to the first bottom point, the first solder joint includes a third bottom point adjacent to the first bottom point, and the first bottom point is spaced from the second bottom point by a distance greater than the third bottom point to an adjacent trench edge of the first bottom point.

3. The photovoltaic solder ribbon of claim 1, wherein the depth of the first slot is 1mm to 3.5 mm;

and/or the depth of the second groove is 1mm-3.5 mm.

4. The photovoltaic solder strip of claim 1, wherein the width of the notch of the first slot is 5mm to 15 mm;

and/or the width of the notch of the second groove is 5mm-15 mm.

5. The photovoltaic solder strip of claim 1, wherein the first slot includes a first slot edge and a second slot edge that are opposite to each other, the first slot edge is at an angle of 10 ° -40 ° to the length direction of the body, and/or the second slot edge is at an angle of 10 ° -40 ° to the length direction;

and/or the second slot comprises a third slot side and a fourth slot side which are opposite, the included angle between the third slot side and the length direction of the body is 10-40 degrees, and/or the included angle between the fourth slot side and the length direction is 10-40 degrees.

6. The photovoltaic solder strip of claim 1, wherein 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 comprises a third slot edge and a fourth slot edge which are opposite, and the third slot edge and the fourth slot edge form a second fillet.

7. The photovoltaic solder strip of claim 6, wherein the radius of the first rounded corner is 0.5mm to 1.5 mm;

and/or the radius of the second round angle is 0.5mm-1.5 mm.

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 adjacent to the first slot, and a line connecting the first bottom point and the second bottom point forms an angle of 75 ° to 90 ° with the length direction of the body.

9. The photovoltaic solder ribbon of claim 1, wherein the first slot includes a first bottom point and a fourth bottom point, the body is formed with a third rounded corner corresponding to the first bottom point, and/or the body is formed with a fourth rounded corner corresponding to the fourth bottom point;

and/or the second slot comprises a second bottom point and a fifth bottom point, the body is provided with a fifth round angle corresponding to the second bottom point, and/or the body is provided with a sixth round angle 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-1 mm;

and/or the radius of the fourth round angle is 0.1mm-1 mm;

and/or the radius of the fifth round angle is 0.1mm-1 mm;

and/or the radius of the sixth round angle is 0.1mm-1 mm.

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

12. The photovoltaic solder strip of claim 1, wherein the first solder joint and the second solder joint that are adjacent to each other are spaced apart by 6mm to 20mm in the width direction of the body.

13. The photovoltaic solder strip of claim 1, wherein the photovoltaic solder strip has a thickness of 0.1mm to 0.3 mm.

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

15. The photovoltaic solder strip according to claim 1, wherein 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;

and/or the second welding points are distributed on the other side of the body at equal intervals along the length direction of the body.

16. The photovoltaic solder strip of claim 1, wherein the first solder joint is rectangular, rounded rectangular, circular, semicircular, trapezoidal; and/or the second welding points are rectangular, rounded rectangular, circular, semicircular and trapezoidal.

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

18. The photovoltaic solder strip of claim 1, wherein the photovoltaic solder strip is connected with a first battery and a second battery, the first solder joint is connected with the anode of the first battery, the second solder joint is connected with the cathode of the second battery, and the area of the first solder joint is larger than or equal to the area of the second solder joint; or the first welding point is connected with the cathode of the first battery, the second welding point is connected with the anode of the second battery, and the area of the second welding point is larger than or equal to that of the first welding point.

19. A string of cells comprising a plurality of solar cells and a photovoltaic solder ribbon according to any one of claims 1 to 18 connecting at least two of said solar cells.

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