CN114497256A - Photovoltaic solder strip and battery string - Google Patents

Photovoltaic solder strip and battery string Download PDF

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Publication number
CN114497256A
CN114497256A CN202210150319.7A CN202210150319A CN114497256A CN 114497256 A CN114497256 A CN 114497256A CN 202210150319 A CN202210150319 A CN 202210150319A CN 114497256 A CN114497256 A CN 114497256A
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China
Prior art keywords
gap
photovoltaic solder
slits
slit
distance
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Pending
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CN202210150319.7A
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Chinese (zh)
Inventor
陈文华
吴宝安
李贤�
陈刚
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Shenzhen Saineng Digital Energy Technology Co ltd
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Zhejiang Aiko Solar Energy Technology Co Ltd
Guangdong Aiko Technology Co Ltd
Tianjin Aiko Solar Energy Technology Co Ltd
Zhuhai Fushan Aixu Solar Energy Technology Co Ltd
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Application filed by Zhejiang Aiko Solar Energy Technology Co Ltd, Guangdong Aiko Technology Co Ltd, Tianjin Aiko Solar Energy Technology Co Ltd, Zhuhai Fushan Aixu Solar Energy Technology Co Ltd filed Critical Zhejiang Aiko Solar Energy Technology Co Ltd
Priority to CN202210150319.7A priority Critical patent/CN114497256A/en
Publication of CN114497256A publication Critical patent/CN114497256A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0512—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module made of a particular material or composition of materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

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 body still is equipped with the gap, and the one end in gap forms the opening at the body. Therefore, the deformation of the photovoltaic solder strip can be absorbed through the gap, and the damage of stress to the solar cell is reduced.

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 expansion and contraction of the solder strip can cause the cell to be subjected to the stretching stress of the solder strip, thereby causing the solar cell 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.
Disclosure of Invention
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 body still is equipped with the gap, the one end in gap is in the body forms the opening.
Optionally, each first welding point corresponds to a group of the gaps, and as the distance between the group of the gaps and the corresponding first welding point in the length direction increases, the distance between the group of the gaps and the corresponding first welding point in the width direction also increases;
and/or each second welding point corresponds to one group of the gaps, and the distance between one group of the gaps and the corresponding second welding point in the width direction is increased along with the increase of the distance between the corresponding second welding point in the length direction.
Optionally, the group of slits includes a first slit, a second slit, a third slit, a fourth slit and a fifth slit, the first slit is located in the middle of the group of slits, and the second slit and the third slit are respectively located at two sides of the first slit; the fourth gap is positioned on one side of the second gap, which is far away from the first gap, and the fifth gap is positioned on one side of the third gap, which is far away from the first gap;
the lengths of a set of said slits satisfy the following relationship:
L1>L2＝L3>L4＝L5；
wherein L1 is the length of the first slot, L2 is the length of the second slot, L3 is the length of the third slot, L4 is the length of the fourth slot, and L5 is the length of the fifth slot.
Optionally, the photovoltaic solder ribbon connects a first cell and a second cell, the body includes a first connection portion covering the first cell, a second connection portion covering the second cell, and a third connection portion covering a gap between the first cell and the second cell;
the size of the photovoltaic solder strip satisfies the following relation:
d1 ═ L2, and/or d1 ═ L3;
wherein d1 is the width of the first connection portion, L2 is the length of the second slit, and L3 is the length of the third slit.
Optionally, the distance between two adjacent slits in a set of slits satisfies the following relationship:
0.2<L1:(S1+S2)<1.5；
wherein L1 is the length of a first slot, S1 is the distance between the first slot and the second slot, and S2 is the distance between the second slot and the fourth slot;
and/or, 0.2< L1 (S3+ S4) < 1.5;
wherein L1 is a length of a first slit, S3 is a distance between the first slit and the third slit, and S4 is a distance between the third slit and the fifth slit.
Optionally, each first welding point corresponds to a group of the gaps, and as the distance between each group of the gaps and the corresponding first welding point in the length direction increases, the distance between each group of the gaps and the corresponding first welding point in the width direction decreases;
and/or each second welding point corresponds to one group of the gaps, and the distance between one group of the gaps and the corresponding second welding point in the width direction is reduced along with the increase of the distance between the corresponding second welding point in the length direction.
Optionally, each first welding point corresponds to one group of the gaps, and the distances between two adjacent gaps in one group of the gaps are equal;
and/or each second welding point corresponds to one group of the gaps, and the distance between two adjacent gaps in one group of the gaps is equal.
Optionally, the number of the slits is multiple, and the extending directions of the multiple slits are all parallel to the width direction of the body.
Optionally, the width of the gap is 0.2mm-0.6 mm.
Optionally, the distance between two adjacent slits is 1.5mm-4 mm.
Optionally, the distance between two adjacent groups of the gaps is 1.5mm-15 mm.
Optionally, the body is further provided with a through hole, and the other end of the gap is communicated with the through hole.
Optionally, the first welding point is connected with a first battery, the second welding point is connected with a second battery, the through hole is oval, the length of the short axis of the through hole is the width of a gap between the first battery and the second battery, and the long axis of the through hole is overlapped with the center line of the body.
Optionally, the through hole is oval, circular, semicircular, or diamond-shaped.
Optionally, in a group of the through holes corresponding to each first welding point, two adjacent through holes are staggered in the length direction.
Optionally, the width of the body is 2.3mm-6 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 body is rectangular; or the body is bent, and the first welding points and the second welding points are arranged at the bending angles.
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, 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 that 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.
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 this application embodiment, because the body still is equipped with the gap, the one end in gap forms the opening at the body, so can reduce stress to solar cell's damage through the deformation of gap absorption photovoltaic solder strip.
Drawings
FIG. 1 is a schematic diagram of a partial structure of a photovoltaic solder strip in accordance with an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a photovoltaic solder ribbon according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a photovoltaic solder ribbon in accordance with an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a photovoltaic solder ribbon in accordance with an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a photovoltaic solder ribbon in accordance with an embodiment of the present application;
FIG. 6 is a schematic diagram of a partial structure of a photovoltaic solder strip in accordance with an embodiment of the present application;
FIG. 7 is a schematic diagram of a partial structure of a photovoltaic solder strip in accordance with an embodiment of the present application;
FIG. 8 is a schematic view of a partial structure of a photovoltaic solder ribbon in accordance with an embodiment of the present application;
description of the main element symbols:
the photovoltaic solder strip 10, the body 101, a center line 1001 of the body, a first connecting part 1011, a second connecting part 1012 and a third connecting part 1013; a first joint 11, a center line 111 of the first joint, a second joint 12, a center line 121 of the second joint, a gap 13, a first gap 131, a second gap 132, a third gap 133, a fourth gap 134, a fifth gap 135, and a through hole 14;
the width w0 of the body, the width w1 of the gap, the length L1 of the first gap, the length L2 of the second gap, the length L3 of the third gap, the length L4 of the fourth gap, the length L5 of the fifth gap, the width D1 of the first connecting part, the distance S0 of the adjacent first welding point and second welding point in the width direction of the body, the distance S1 between the first gap and the second gap, the distance S2 between the second gap and the fourth gap, the distance S3 between the first gap and the third gap, the distance S4 between the third gap and the fifth gap, and the distance D1 of the two adjacent groups of gaps.
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 on 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 body 101 is further provided with a slit 13, and one end of the slit 13 forms an opening in the body 101.
According to the photovoltaic solder strip 10 of the embodiment of the application, the body 101 is provided with the gap 13, and the one end of the gap 13 forms an opening in the body 101, so that the deformation of the photovoltaic solder strip 10 can be absorbed through the gap 13, and the damage of stress to the solar cell is reduced.
It can be understood that the photovoltaic solder strip 10 compresses or expands when subjected to stress, so that the expansion stress can be better absorbed by the deformation of the slit 13.
It is understood that the slit 13 has a long and narrow shape, and one end and the other end of the slit 13 refer to both ends in the length direction of the slit 13.
Referring to fig. 2, optionally, the first solder joints 11 and the second solder joints 12 have different shapes; and/or the center lines of at least one group of adjacent first welding points 11 and second welding points 12 are staggered in the width direction of the body 101. Therefore, the first welding spots 11 and the second welding spots 12 respectively positioned on the two sides of the body 101 are staggered in the width direction of the body 101, and/or the shapes of the first welding spots 11 and the second welding spots 12 are different, so that the expansion stress can be better absorbed through the deformation of the photovoltaic welding strips 10, and 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.
Specifically, in the case where the solder ribbon 10 is deformed, the closer to the first solder 11 or the second solder 12 on the line segment formed by connecting the adjacent first solder 11 and second solder 12, the greater the stress.
It can be understood that the shapes of the welding points on the two sides are different or the center lines are staggered, so that the welding points on the two sides of the photovoltaic welding strip 10 can be asymmetric.
It is understood that in other embodiments, the shape of the solder points on both sides may be the same; in other embodiments, the center lines of the two side weld points may be aligned. In other words, in other embodiments, the welding points on both sides of the photovoltaic solder strip 10 can be symmetrical.
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.
It is understood that "the first solder joints 11 are different in shape from the second solder joints 12; and/or, the center lines of at least one group of adjacent first welding points 11 and second welding points 12 are staggered in the width direction of the body 101 "includes three conditions: the shapes of the first welding points 11 and the second welding points 12 are different, and the central lines of at least one group of adjacent first welding points 11 and second welding points 12 are staggered in the width direction of the body 101; the shapes of the first welding points 11 and the second welding points 12 are different, and the central lines of all the adjacent first welding points 11 and second welding points 12 are overlapped in the width direction of the body 101; the first welding spots 11 and the second welding spots 12 have the same shape, and the center lines of at least one group of adjacent first welding spots 11 and second welding spots 12 are staggered 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.
It is understood that "the center lines of at least one set of the first welding points 11 and the second welding points 12 adjacent to each other are staggered in the width direction of the body 101", may be the center lines of one set of the first welding points 11 and the second welding points 12 adjacent to each other 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 spots 11 and second welding spots 12 may be staggered 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.
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 solder 12 is a line passing through the center of the second solder 12 and parallel to the width direction.
Referring to fig. 2, 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 with the length direction of the solder strip 10, where the included angle γ is 20 ° -60 °. Therefore, the staggering degree of the first welding points 11 and the second welding points 12 is proper, so that the telescopic stress can be better absorbed through the deformation of the welding strip 10, and the damage of the stress to the battery can be further reduced to the minimum.
Specifically, the included angle γ is, for example, 21 °, 23 °, 30 °, 32 °, 35 °, 39 °, 40 °, 45 °, 50 °, 55 °, 60 °.
Further, 20 ° < γ <40 °. For example 21 °, 23 °, 30 °, 32 °, 35 °, 39 °.
Preferably, γ is 23 °. In this way, the degree of misalignment of the first solder joint 11 and the second solder joint is optimized.
Referring to fig. 2, the thickness of the photovoltaic solder strip 10 is optionally 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 is 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.
Referring to fig. 2, optionally, a 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 photovoltaic solder strip 10 has a hardness in the range of 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. 2, optionally, the body 101 is rectangular. Thus, the body 101 is regular in shape and easy to manufacture.
Referring to fig. 3, optionally, the body 101 is bent, and the first welding point 11 and the second welding point 12 are disposed at a bending angle. In this way, the stress applied to the solar cell is reduced by the bent main body 101, and damage to the solar cell is reduced. Meanwhile, the bending angle can also assist in positioning the first welding point 11 and the second welding point 12, which is beneficial to improving the manufacturing efficiency. Further, the bending angle is an obtuse angle. Therefore, the angle of the bending angle is larger, and the stress on the solar cell can be further reduced. Further, each bending corner is provided with a first weld 11 or a second weld 12.
It is understood that in other embodiments, the body 101 may be connected by a rectangle and a bend alternately, or may have other shapes; in other embodiments, the bending angle may be an acute angle, the bending angle may be a right angle, the bending angle may be an arc angle, or at least two of an acute angle, a right angle, an obtuse angle, and an arc angle; in other embodiments, some of the bending corners may be provided with the first welding points 11 or the second welding points 12, and the rest of the bending corners may not be provided with the first welding points 11 and the second welding points 12.
Referring to fig. 2, 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. 2, 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. 2, 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. 2, 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.
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 two adjacent 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. 2, the distance S0 between adjacent first welding points 11 and second welding points 12 in the width direction of the body 101 is optionally 5mm to 15 mm. For example 5mm, 5.5mm, 8mm, 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 example of fig. 2, the plurality of first pads 11 and the plurality of second pads 12 each have a rounded rectangular shape. Further, the radius of the chamfer 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 chamfer 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 first welding points 11 may be the same, different from the shapes of the rest first welding points 11, or the shapes of all first welding points 11 may be different; some of the second pads 12 may have the same shape, and may have a shape different from the shape of the rest of the second pads 12, or all of the second pads 12 may have a shape different from the shape of the rest of the second pads 12.
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.
Alternatively, referring to fig. 2, the slit 13 is rectangular. Thus, the shape of the slit 13 is regular, and the manufacturing is convenient. It is understood that in other examples, the gap 13 may have an oval shape, a racetrack shape, or other irregular shapes.
Further, in the case where the slit 13 has a rectangular shape and the length direction of the slit 13 coincides with the width direction of the main body 101, the length of the slit 13 refers to the dimension of the slit 13 in the width direction of the main body 101. The width of the slit 13 refers to the dimension of the slit 13 in the longitudinal direction of the body 101.
Specifically, in the example of fig. 4 and 5, the number of the slits 13 is plural. Therefore, the photovoltaic solder strip 10 has stronger capacity of absorbing the stretching stress through the plurality of gaps 13, and the damage of the stress to the solar cell is further reduced. It will be appreciated that in other embodiments, the number of slots 13 may be one, as shown in fig. 2 and 3.
Specifically, in the example of fig. 4 and 5, the openings of the slits 13 are formed on both sides in the width direction of the body 101. Therefore, the body 101 can deform at two sides of the width direction through the gap 13, the deformation range is expanded, the capacity of the photovoltaic solder strip 10 for absorbing the stretching stress is stronger, and the damage of the stress to the solar cell is further reduced. It is understood that in other embodiments, the opening of the slit 13 may be formed only on one side in the width direction of the body 101, as shown in fig. 2 and 3; and may be formed on one side or both sides in the length direction of the body 101.
Referring to fig. 4, optionally, each first welding point 11 corresponds to one group of slits 13, and as the distance from the corresponding first welding point 11 in the length direction increases, the distance from the group of slits 13 to the corresponding first welding point 11 in the width direction also increases. Optionally, each second welding point 12 corresponds to one group of slits 13, and as the distance from the corresponding second welding point 12 in the length direction increases, the distance from one group of slits 13 to the corresponding second welding point 12 in the width direction also increases. Therefore, the photovoltaic solder strip 10 can transmit current better, and the photovoltaic solder strip 10 can absorb stress better.
Specifically, in the example of fig. 4, the number of the slits 13 in the group of slits 13 corresponding to the first welding point 11 is 5, and the number of the slits 13 in the group of slits 13 corresponding to the second welding point 12 is 5.
It is understood that in other embodiments, the number of slits 13 in the group of slits 13 corresponding to the first welding point 11 may be different from the number of slits 13 in the group of slits 13 corresponding to the second welding point 12; the number of the gaps 13 in the group of gaps 13 corresponding to the first welding point 11 may be 2, 3, 4, 6 or other numbers; the number of slits 13 in the group of slits 13 corresponding to the second welding point 12 may be 2, 3, 4, 6 or other numbers.
It is understood that in other embodiments, a group of slits 13 may correspond to each first welding point 11, and the distance between a group of slits 13 and the corresponding first welding point 11 in the width direction decreases as the distance from the corresponding first welding point 11 in the length direction increases. In other embodiments, each second welding point 12 may correspond to one group of slits 13, and the distance between one group of slits 13 and the corresponding second welding point 12 in the width direction decreases as the distance from the corresponding second welding point 12 in the length direction increases. Therefore, the photovoltaic solder strip 10 can transmit current better, and the photovoltaic solder strip 10 can absorb stress better.
Referring to fig. 4, alternatively, in the case that the number of the slits 13 in the group of slits 13 corresponding to the first welding point 11 is odd, the group of slits 13 is symmetrical with respect to the center line of the middle slit 13. Therefore, the gaps 13 are symmetrically arranged, so that the photovoltaic solder strip is convenient to manufacture and is beneficial to absorbing the telescopic stress better through the deformation of the photovoltaic solder strip 10.
Note that the center line of the slit 13 is a line passing through the center of the slit 13 and parallel to the width direction.
Further, the center line of the middle gap 13 coincides with the center line 111 of the corresponding first weld point. Thus, the middle gap 13 is convenient to position according to the first welding point 11, or the first welding point 11 is convenient to position according to the middle gap 13, and the production efficiency is improved.
Similarly, in the case where the number of slits 13 in the group of slits 13 corresponding to the second welding point 12 is odd, the group of slits 13 is symmetrical with respect to the center line of the intermediate slit 13. Therefore, the gaps 13 are symmetrically arranged, so that the photovoltaic solder strip is convenient to manufacture and is beneficial to absorbing the telescopic stress better through the deformation of the photovoltaic solder strip 10.
Further, the center line of the middle gap 13 coincides with the center line of the corresponding second weld point 12. Thus, the middle gap 13 is convenient to position according to the second welding points 12, or the second welding points 12 are convenient to position according to the middle gap 13, and the production efficiency is improved.
Referring to fig. 5, alternatively, the distances between a group of slits 13 corresponding to the first welding points 11 and the corresponding first welding points 11 in the width direction may be equal, and the distances in the length direction may also be equal. Therefore, the manufacturing is convenient, and the production efficiency is improved.
Specifically, in the example of fig. 5, in a group of slits 13 corresponding to the first welding point 11, the number of slits 13 is 2, and is symmetrical with respect to the center line 111 of the first welding point; in a group of slits 13 corresponding to the second welding point 12, the number of the slits 13 is 2, and the slits are symmetrical about the center line of the second welding point 12.
Referring to fig. 5, alternatively, in the case that the number of the slits 13 in the group of slits 13 corresponding to the first welding point 11 is even, the group of slits 13 is symmetrical with respect to the central line of the two intermediate slits 13. Therefore, the gaps 13 are symmetrically arranged, so that the photovoltaic solder strip is convenient to manufacture and is beneficial to absorbing the telescopic stress better through the deformation of the photovoltaic solder strip 10.
Note that the center line of the middle two slits 13 is a line passing through the midpoint of the middle two slits 13 and parallel to the width direction.
Further, the center lines of the two middle slits 13 coincide with the center line 111 of the corresponding first welding point. Thus, the two middle gaps 13 are convenient to position according to the first welding points 11, or the first welding points 11 are convenient to position according to the two middle gaps 13, and the production efficiency is improved.
Similarly, in the case where the number of the slits 13 in the group of slits 13 corresponding to the second welding point 12 is an even number, the group of slits 13 is symmetrical with respect to the center line of the two slits 13 in the middle. Therefore, the gaps 13 are symmetrically arranged, so that the photovoltaic solder strip is convenient to manufacture and is beneficial to absorbing the telescopic stress better through the deformation of the photovoltaic solder strip 10.
Further, the center lines of the two middle slits 13 coincide with the center lines of the corresponding second welding points 12. Thus, the two middle gaps 13 are convenient to position according to the second welding points 12, or the second welding points 12 are convenient to position according to the two middle gaps 13, and the production efficiency is improved.
Referring to fig. 6, optionally, the group of slits 13 includes a first slit 131, a second slit 132, a third slit 133, a fourth slit 134, and a fifth slit 135, the first slit 131 is located in the middle of the group of slits 13, and the second slit 132 and the third slit 133 are respectively located at two sides of the first slit 131; the fourth slit 134 is located on the side of the second slit 132 facing away from the first slit 131, and the fifth slit 135 is located on the side of the third slit 133 facing away from the first slit 131; the lengths of the set of slits 13 satisfy the following relationship:
L1>L2＝L3>L4＝L5；
where L1 is the length of the first slot 131, L2 is the length of the second slot 132, L3 is the length of the third slot 133, L4 is the length of the fourth slot 134, and L5 is the length of the fifth slot 135.
In this way, as the distance from the corresponding welding point in the length direction increases, the distance from the corresponding welding point in the width direction also increases, and at the same time, the length of the five slits 13 is made symmetrical with respect to the first slit 131 located in the middle, which facilitates better absorption of the stretching stress by deformation of the photovoltaic solder ribbon 10.
Referring to fig. 6, the length L1 of the first slit 131 is optionally 1.75mm to 1.85 mm. For example, 1.75mm, 1.8mm, 1.82mm, 1.83mm, 1.84mm, 1.85 mm. Preferably, the length L1 of the first slit 131 is 1.8 mm.
Optionally, the length L2 of the second slit 132 is 1.5mm to 1.7 mm. For example, 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7 mm. Preferably, the length L2 of the second slit 132 is 1.6 mm.
Optionally, the length L3 of the third slit 133 is 1.5mm to 1.7 mm. For example, 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7 mm. Preferably, the length L3 of the third slit 133 is 1.6 mm.
Optionally, the length L4 of the fourth slit 134 is 0.6mm-0.8 mm. For example, 0.6mm, 0.65mm, 0.68mm, 0.7mm, 0.75mm, 0.8 mm. Preferably, the length L4 of the fourth slit 134 is 0.7 mm.
Optionally, the length L5 of the fifth slit 135 is 0.6mm-0.8 mm. For example, 0.6mm, 0.65mm, 0.68mm, 0.7mm, 0.75mm, 0.8 mm. Preferably, the length L5 of the fifth slit 135 is 0.7 mm.
Referring to fig. 6, optionally, the photovoltaic solder ribbon 10 connects the first battery and the second battery, and the body 101 includes a first connection portion 1011 covering the first battery, a second connection portion 1012 covering the second battery, and a third connection portion 1013 covering a gap between the first battery and the second battery; the dimensions of the photovoltaic solder ribbon 10 satisfy the following relationship:
d1 ═ L2, and/or d1 ═ L3;
where d1 is the width of the first connection 1011, L2 is the length of the second gap 132, and L3 is the length of the third gap 133.
Thus, the length of the second gap 132 and/or the third gap 133 is equal to the width of the first connection portion 1011, so that the deformation capability of the contact portion between the body 101 and the solar cell is stronger, the capability of absorbing the stretching stress is stronger, and the damage of the stress to the solar cell can be further reduced.
Referring to fig. 6, alternatively, the distance between two adjacent slits 13 in a group of slits 13 satisfies the following relationship:
0.2<L1:(S1+S2)<1.5；
wherein L1 is the length of the first slit 131, S1 is the distance between the first slit 131 and the second slit 132, and S2 is the distance between the second slit 132 and the fourth slit 134;
and/or, 0.2< L1 (S3+ S4) < 1.5;
where L1 is the length of the first slit 131, S3 is the distance between the first slit 131 and the third slit 133, and S4 is the distance between the third slit 133 and the fifth slit 135.
In this way, the distance between two adjacent slits 13 in a group of slits 13 is related to the length of the first slit 131, so as to better absorb the stretching stress, thereby minimizing the damage of the stress to the solar cell.
Specifically, L1 has values of (S3+ S4) of, for example, 0.21, 0.22, 0.37, 0.8, 0.9, 1, 1.3, 1.49.
In the example of FIG. 6, L1 has a value of 0.37 (S3+ S4). L1 was 1.8mm, S3 was 2.9mm, and S4 was 2 mm.
Referring to fig. 6, the width d1 of the first connection portion 1011 is optionally 1.5mm-1.7 mm. For example, 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7 mm. Preferably, the width d1 of the first connection portion 1011 is 1.6 mm.
Optionally, the width d2 of the second connecting portion 1012 is 1.5mm-1.7 mm. For example, 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7 mm. Preferably, the width d2 of the second connection part 1012 is 1.6 mm.
Alternatively, the width d3 of the third connecting part 1013 is 0.1mm-2 mm. For example, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.8mm, 1mm, 1.5mm, 1.7mm, 2 mm. Preferably, the width d3 of the third connecting part 1013 is 0.15 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 is larger than or equal to that of the first welding point.
It can be understood that, since the current of the positive electrode is larger than that of the negative electrode, the width of the connecting part corresponding to the positive electrode can be made larger, so that 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 larger than that of the second welding point 12; it is also possible that 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.
Referring to fig. 6, optionally, the number of the slits 13 is multiple, and the extending directions of the slits 13 are all parallel to the width direction of the body 101. In this way, the expansion and contraction stress in the longitudinal direction of the main body 101 can be absorbed more, and damage of the solar cell by the stress can be reduced. Moreover, the extending directions of the plurality of gaps 13 are parallel to each other, so that the manufacturing is convenient, and the production efficiency is improved.
It is understood that in other embodiments, all the slits 13 may extend at an angle to the width direction of the body 101; the extending direction of some slits 13 forms an angle with the width direction of the body 101, and the extending direction of the remaining slits 13 is parallel to the width direction of the body 101. Further, when the extending direction of the plurality of slits 13 forms an angle with the width direction of the main body 101, the plurality of slits 13 may or may not be parallel to each other.
Referring to fig. 6, the width w1 of the gap 13 is optionally 0.2mm-0.6 mm. For example, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6 mm. Therefore, the width w1 of the gap 13 is in a proper range, so that the poor deformation capability of the photovoltaic solder strip 10 caused by the too small width w1 of the gap 13 is avoided, and the poor strength of the photovoltaic solder strip 10 caused by the too large width w1 of the gap 13 is avoided. The tolerance for the width w1 of the slot 13 may be ± 0.05.
Preferably, the width w1 of the slit 13 is 0.4 mm. Therefore, the deformability and the mechanical strength of the photovoltaic solder strip 10 can be considered, and the overall effect is the best.
Specifically, in the example of fig. 6, the width w1 of the slit 13 is the dimension of the slit 13 in the length direction of the body 101.
Referring to fig. 6, alternatively, the distance between two adjacent slits 13 is 1.5mm to 4 mm. For example, 1.5mm, 1.8mm, 1.9mm, 2.0mm, 2.5mm, 2.9mm, 3mm, 3.5mm, 4 mm. Therefore, the distance between two adjacent gaps 13 is within a proper range, the poor mechanical strength of the photovoltaic solder strip 10 caused by the undersize distance between two adjacent gaps 13 is avoided, and the poor deformability of the photovoltaic solder strip 10 caused by the overlarge distance between two adjacent gaps 13 can also be avoided.
Specifically, the pitch of two adjacent slits 13 refers to the distance of the center lines of two adjacent slits 13. S1 in fig. 6 is the distance between the first slit 131 and the second slit 132, which is 2.9 mm; s2 is the distance between the second slit 132 and the fourth slit 134, which is 2 mm; s3 is the distance between the first slit 131 and the third slit 133, which is 2.9 mm; s4 is a distance between the third slit 133 and the fifth slit 135, which is 2 mm. The tolerance is ± 0.01.
Specifically, in a group of slits 13, the distances between two adjacent slits 13 may be the same or different. Under the condition that the distance between two adjacent gaps 13 is the same, the distance between two adjacent gaps 13 is a fixed value within the range of 1.5mm-4 mm; when the distance between two adjacent slits 13 is different, the distance between two adjacent slits 13 is a plurality of values in the range of 1.5mm to 4 mm.
In the example of fig. 6, in a group of slits 13, the distance between two adjacent slits 13 is the same, and is 2.28 mm.
Referring to fig. 6, optionally, the distance D1 between two adjacent groups of slits 13 is 1.5mm to 15 mm. For example, 1.5mm, 1.575mm, 2mm, 5mm, 8mm, 10mm, 12mm, 15 mm. Therefore, the distance D1 between the two adjacent groups of slits 13 is within a proper range, the poor mechanical strength of the photovoltaic solder strip 10 caused by the excessively small distance D1 between the two adjacent groups of slits 13 is avoided, and the poor deformability of the photovoltaic solder strip 10 caused by the excessively large distance D1 between the two adjacent groups of slits 13 is also avoided. Preferably, the distance D1 between two adjacent groups of slits 13 is 1.575 mm.
Specifically, the pitch of two adjacent groups of slits 13 refers to the distance between two slits 13 that belong to the two groups of slits 13, respectively, and are closest to each other.
Referring to fig. 7, optionally, the body 101 is further provided with a through hole 14, and the other end of the slit 13 is communicated with the through hole 14. Thus, the deformation of the photovoltaic solder strip 10 can be absorbed through the through hole 14, and the damage of stress to the solar cell is reduced. Moreover, the slit 13 communicates with the through hole 14, so that the effect of absorbing the deformation of the solder ribbon 10 is better.
Specifically, the number of the through holes 14 may be one or more. One slit 13 may communicate with one through hole 14, a plurality of slits 13 may communicate with one through hole 14, and one slit 13 may communicate with a plurality of through holes 14. The specific manner in which the slit 13 communicates with the through-hole 14 is not limited herein.
Referring to fig. 7, the through holes 14 corresponding to the second slit 132 and the third slit 133 are elliptical, and the length of the minor axis is greater than the width of the gap between the first battery and the second battery. The through holes 14 corresponding to the second slit 132 and the third slit 133 are offset from the third connecting part 1013.
Referring to fig. 7, optionally, the long axis of the through hole 14 corresponding to the first slit 131 is 2.3mm to 2.5 mm. For example, 2.3mm, 2.32mm, 2.38mm, 2.4mm, 2.45mm, 2.5 mm. Preferably, the long axis of the through hole 14 corresponding to the first slit 131 is 2.4 mm.
Referring to fig. 7, optionally, the short axis of the through hole 14 corresponding to the first slit 131 is 0.9mm to 1.1 mm. For example, 0.9mm, 0.92mm, 0.95mm, 1mm, 1.05mm, 1.1 mm. Preferably, the minor axis of the through hole 14 corresponding to the first slit 131 is 1 mm.
Referring to fig. 7, optionally, the long axis of the through hole 14 corresponding to the second slit 132 is 1.9mm to 2.1 mm. For example, 1.9mm, 1.92mm, 1.95mm, 2mm, 2.05mm, 2.07mm, 2.1 mm. Preferably, the long axis of the through hole 14 corresponding to the second slit 132 is 2 mm.
Referring to fig. 7, the minor axis of the through hole 14 corresponding to the second slit 132 is optionally 0.75mm to 0.85 mm. For example, 0.75mm, 0.76mm, 0.78mm, 0.8mm, 0.81mm, 0.84mm, 0.85 mm. Preferably, the minor axis of the through hole 14 corresponding to the second slit 132 is 0.8 mm.
Referring to fig. 7, optionally, the long axis of the through hole 14 corresponding to the third slit 133 is 1.9mm to 2.1 mm. For example, 1.9mm, 1.92mm, 1.95mm, 2mm, 2.05mm, 2.07mm, 2.1 mm. Preferably, the long axis of the through hole 14 corresponding to the third slit 133 is 2 mm.
Referring to fig. 7, optionally, the minor axis of the through hole 14 corresponding to the third slit 133 is 0.75mm to 0.85 mm. For example, 0.75mm, 0.76mm, 0.78mm, 0.8mm, 0.81mm, 0.84mm, 0.85 mm. Preferably, the minor axis of the through hole 14 corresponding to the third slit 133 is 0.8 mm.
Referring to fig. 7, optionally, the long axis of the through hole 14 corresponding to the fourth slit 134 is 1.1mm to 1.3 mm. For example, 1.1mm, 1.11mm, 1.14mm, 1.2mm, 1.25mm, 1.27mm, 1.3 mm. Preferably, the long axis of the through hole 14 corresponding to the fourth slit 134 is 1.2 mm.
Referring to fig. 7, the minor axis of the through hole 14 corresponding to the fourth slit 134 is optionally 0.5mm to 0.7 mm. For example, 0.5mm, 0.51mm, 0.58mm, 0.6mm, 0.64mm, 0.68mm, 0.7 mm. Preferably, the minor axis of the through hole 14 corresponding to the fourth slit 134 is 0.6 mm.
Referring to fig. 7, optionally, the long axis of the through hole 14 corresponding to the fifth slit 135 is 1.1mm to 1.3 mm. For example, 1.1mm, 1.11mm, 1.14mm, 1.2mm, 1.25mm, 1.27mm, 1.3 mm. Preferably, the long axis of the through hole 14 corresponding to the fifth slit 135 is 1.2 mm.
Referring to fig. 7, optionally, the minor axis of the through hole 14 corresponding to the fifth slit 135 is 0.5mm to 0.7 mm. For example, 0.5mm, 0.51mm, 0.58mm, 0.6mm, 0.64mm, 0.68mm, 0.7 mm. Preferably, the minor axis of the through hole 14 corresponding to the fifth slit 135 is 0.6 mm.
Referring to fig. 7, optionally, four rounded corners with a radius of 0.2 are formed at the connection positions of the first slits 131 and the corresponding through holes 14.
Referring to fig. 7, optionally, four rounded corners with a radius of 0.2 are formed at the connection positions of the second slits 132 and the corresponding through holes 14.
Referring to fig. 7, optionally, four rounded corners with a radius of 0.2 are formed at the connection positions of the third slits 133 and the corresponding through holes 14.
Referring to fig. 7, optionally, four rounded corners with a radius of 0.1 are formed at the connection positions of the fourth slits 134 and the corresponding through holes 14.
Referring to fig. 7, optionally, four rounded corners with a radius of 0.1 are formed at the connection positions of the fifth slits 135 and the corresponding through holes 14.
Referring to fig. 8, optionally, the first welding point 11 is connected to the first battery, the second welding point 12 is connected to the second battery, the through hole 14 is elliptical, the length of the minor axis of the through hole 14 is the width of the gap between the first battery and the second battery, and the major axis of the through hole 14 coincides with the center line 1001 of the body 101.
Therefore, the short shaft of the through hole 14 is clamped between the first battery and the second battery and is parallel to the width direction of the body 101, and the long shaft of the through hole 14 is parallel to the length direction of the body 101, so that the effect of the through hole 14 on absorbing deformation of the photovoltaic solder strip 10 is better, and damage of stress to the solar battery can be further reduced.
Specifically, the long axis of the through-hole 14 coincides with the center line of the gap between the first cell and the second cell. Thus, the through hole 14 has a better effect of absorbing the deformation of the solder ribbon 10, and the damage of the battery caused by the stress can be further reduced.
Specifically, in the example of fig. 8, the through holes 14 corresponding to the second slit 132 and the third slit 133 in the through holes 14 corresponding to the group of slits 13 have an elliptical shape, the length of the minor axis is the width of the gap between the first cell and the second cell, and the major axis coincides with the center line 1001 of the body 101. In this way, the deformation of the photovoltaic solder strip 10 is absorbed at other positions of the body 101 through the through holes 14 corresponding to the first slit 131, the fourth slit 134 and the fifth slit 135, so that the effect of absorbing the deformation is better.
It is understood that in other examples, all the through holes 14 corresponding to a set of slits 13 may be elliptical, the length of the minor axis is the width of the gap between the first battery and the second battery, and the major axis is coincident with the center line 1001 of the body 101.
It is understood that in other examples, the through-holes 14 may be circular, semi-circular, diamond shaped, or other shapes in addition to oval. The plurality of through holes 14 may be identical in shape or different in shape. And are not limited herein.
Optionally, in a group of through holes 14 corresponding to each first solder point 11, two adjacent through holes 14 are staggered in the length direction. In this way, the current can be better transmitted, and the deformation of the photovoltaic solder strip 10 can be better absorbed.
It is understood that, in other embodiments, two adjacent through holes 14 in the group of through holes 14 corresponding to each first welding point 11 may partially overlap or completely overlap in the length direction.
Referring to fig. 7 and 8, optionally, each first solder 11 corresponds to a group of through holes 14, and as the distance from the corresponding first solder 11 in the length direction increases, the major axis and the minor axis of each group of through holes 14 decrease. Optionally, each second welding spot 12 corresponds to a group of through holes 14, and as the distance from the corresponding second welding spot 12 in the length direction increases, the major axis and the minor axis of each group of through holes 14 decrease. Therefore, the photovoltaic solder strip 10 can transmit current better, and the photovoltaic solder strip 10 can absorb stress better.
It is understood that in other embodiments, each first welding point 11 may correspond to a group of through holes 14, and the long axis and the short axis of each group of through holes 14 increase with the distance from the corresponding first welding point 11 in the length direction. In other embodiments, each second welding point 12 may correspond to a group of through holes 14, and the major axis and the minor axis of each group of through holes 14 increase with the distance from the corresponding second welding point 12 in the length direction.
Referring to fig. 8, alternatively, the distance between two adjacent slits 13 in a group of slits 13 is equal.
It is understood that in a group of slits 13, the distance between two adjacent slits 13 may be different; or may be partially the same or partially different.
The battery string of the embodiment of the application comprises a plurality of solar cells and the photovoltaic solder strip 10 of any one of the solar cells, wherein the photovoltaic solder strip 10 is connected with at least two solar cells.
According to the cell string provided by the embodiment of the application, the body 101 is provided with the gap 13, and the opening is formed at one end of the gap 13 on the body 101, so that the deformation of the photovoltaic solder strip 10 can be absorbed through the gap 13, and the damage of stress to the solar cell is reduced.
The present application is intended to cover various modifications, equivalent arrangements, and adaptations of the present application without departing from the spirit and scope of the present application.

Claims (23)

1. A photovoltaic solder strip, 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 body still is equipped with the gap, the one end in gap is in the body forms the opening.
2. The photovoltaic solder ribbon according to claim 1, wherein each of the first solder joints corresponds to a group of the slits, and the distance between a group of the slits and the corresponding first solder joint in the width direction increases with the distance between the group of the slits and the corresponding first solder joint in the length direction;
and/or each second welding point corresponds to one group of the gaps, and the distance between one group of the gaps and the corresponding second welding point in the width direction is increased along with the increase of the distance between the corresponding second welding point in the length direction.
3. The photovoltaic solder strip of claim 2, wherein the set of gaps includes a first gap, a second gap, a third gap, a fourth gap and a fifth gap, the first gap is located at a middle position of the set of gaps, and the second gap and the third gap are respectively located at two sides of the first gap; the fourth gap is positioned on one side of the second gap, which is far away from the first gap, and the fifth gap is positioned on one side of the third gap, which is far away from the first gap;
the lengths of a set of said slits satisfy the following relationship:
L1>L2＝L3>L4＝L5；
wherein L1 is the length of the first slot, L2 is the length of the second slot, L3 is the length of the third slot, L4 is the length of the fourth slot, and L5 is the length of the fifth slot.
4. The photovoltaic solder ribbon of claim 3, wherein the photovoltaic solder ribbon connects a first cell and a second cell, the body includes a first connection portion covering the first cell, a second connection portion covering the second cell, and a third connection portion covering a gap between the first cell and the second cell;
the size of the photovoltaic solder strip satisfies the following relation:
d1 ═ L2, and/or d1 ═ L3;
wherein d1 is the width of the first connection portion, L2 is the length of the second slit, and L3 is the length of the third slit.
5. The photovoltaic solder ribbon according to claim 3, wherein the distance between two adjacent slits in a group of the slits satisfies the following relationship:
0.2<L1:(S1+S2)<1.5；
wherein L1 is the length of a first slot, S1 is the distance between the first slot and the second slot, and S2 is the distance between the second slot and the fourth slot;
and/or, 0.2< L1 (S3+ S4) < 1.5;
wherein L1 is a length of the first slit, S3 is a distance between the first slit and the third slit, and S4 is a distance between the third slit and the fifth slit.
6. The photovoltaic solder ribbon of claim 1, wherein each first solder joint corresponds to a set of the gaps, and the distance between a set of the gaps and the corresponding first solder joint in the width direction decreases as the distance from the corresponding first solder joint in the length direction increases;
and/or each second welding point corresponds to one group of the gaps, and the distance between one group of the gaps and the corresponding second welding point in the width direction is reduced along with the increase of the distance between the corresponding second welding point in the length direction.
7. The photovoltaic solder strip of claim 1, wherein each of the first solder joints corresponds to a group of the slits, and the distance between two adjacent slits in a group of the slits is equal;
and/or each second welding point corresponds to one group of the gaps, and the distance between two adjacent gaps in one group of the gaps is equal.
8. The photovoltaic solder strip according to claim 1, wherein the number of the slits is plural, and the extending direction of the plural slits is parallel to the width direction of the body.
9. The photovoltaic solder strip of claim 1, wherein the width of the gap is 0.2mm to 0.6 mm.
10. The photovoltaic solder strip of claim 1, wherein the distance between two adjacent gaps is 1.5mm-4 mm.
11. The photovoltaic solder strip of claim 1, wherein the gap between two adjacent groups is 1.5mm-15 mm.
12. The photovoltaic solder strip of any one of claims 1-11, wherein the body is further provided with a through hole, and the other end of the slit is communicated with the through hole.
13. The photovoltaic solder strip of claim 12, wherein the first solder joint connects a first cell, the second solder joint connects a second cell, the through hole is oval, a minor axis of the through hole is a width of a space between the first cell and the second cell, and a major axis of the through hole coincides with a center line of the body.
14. The photovoltaic solder strip of claim 12, wherein the through holes are oval, circular, semicircular, diamond-shaped.
15. The photovoltaic solder ribbon of claim 12, wherein in the set of through holes corresponding to each first solder joint, two adjacent through holes are staggered in the length direction.
16. The photovoltaic solder strip of claim 1, wherein the width of the body is 2.3mm-6 mm.
17. The photovoltaic solder strip of claim 1, wherein the photovoltaic solder strip has a thickness of 0.1mm to 0.3 mm.
18. 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.
19. 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.
20. The photovoltaic solder strip of claim 1, wherein the body is rectangular; or the body is bent, and the first welding points and the second welding points are arranged at the bending angles.
21. 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.
22. 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 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.
23. A string of cells comprising a plurality of solar cells and a photovoltaic solder ribbon according to any one of claims 1 to 22 connecting at least two of said solar cells.
CN202210150319.7A 2022-02-18 2022-02-18 Photovoltaic solder strip and battery string Pending CN114497256A (en)

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Application Number Priority Date Filing Date Title
CN202210150319.7A CN114497256A (en) 2022-02-18 2022-02-18 Photovoltaic solder strip and battery string

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210150319.7A CN114497256A (en) 2022-02-18 2022-02-18 Photovoltaic solder strip and battery string

Publications (1)

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CN114497256A true CN114497256A (en) 2022-05-13

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