CN114512572B

CN114512572B - Solder strip prefabricated part and production method thereof, solder strip and production method thereof

Info

Publication number: CN114512572B
Application number: CN202210150967.2A
Authority: CN
Inventors: 陈文华; 吴宝安; 李贤�; 陈刚
Original assignee: Shenzhen Saineng Digital Energy Technology Co ltd
Current assignee: Shenzhen Saineng Digital Energy Technology Co ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2024-03-29
Anticipated expiration: 2042-02-18
Also published as: CN114512572A

Abstract

The application is applicable to the technical field of solar cells, and provides a solder strip prefabricated member and a production method thereof, and a solder strip and a production method thereof. A method of producing a solder strip preform comprising: paving a metal sheet on a stamping table; stamping the metal sheet according to a preset pattern to form a welding strip prefabricated member; the welding strip prefabricated member comprises a region to be cut off and a plurality of welding strip regions which are parallel to each other, and two ends of the welding strip regions are connected with the region to be cut off. Therefore, a plurality of welding strips can be cut out at one time based on the welding strip prefabricated member, and the production efficiency is higher.

Description

Solder strip prefabricated part and production method thereof, solder strip and production method thereof

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a solder strip prefabricated member and a production method thereof, and a solder strip and a production method thereof.

Background

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

The related art generally connects a plurality of solar cells into one body using a solder tape, and thus packages the solar cells into a battery module through processes of laying, lamination, etc. However, the substrate is usually pulled once to form a welding strip, and the production efficiency is low.

Based on this, how to improve the production efficiency of the solder strip becomes a problem to be solved.

Disclosure of Invention

The application provides a welding strip prefabricated part and a production method thereof, and a welding strip and a production method thereof, and aims to solve the problem of how to improve the production efficiency of the welding strip.

In a first aspect, the present application provides a method for producing a solder strip preform, comprising:

paving a metal sheet on a stamping table;

stamping the metal sheet according to a preset pattern to form a welding strip prefabricated member; the welding strip prefabricated member comprises a region to be cut off and a plurality of welding strip regions which are parallel to each other, and two ends of the welding strip regions are connected with the region to be cut off.

Optionally, the region to be cut is provided with positioning holes, and each positioning hole corresponds to one welding strip region.

Optionally, the diameter of the positioning hole is 1.2mm-1.3mm.

Optionally, the region to be truncated is provided with a truncation hole, and each truncation hole is located at two ends of the welding strip region.

Optionally, the to-be-cut area is provided with cut-off openings, and each cut-off opening is located at two ends of the welding strip area in the length direction and located at two ends of the welding strip area in the width direction.

Optionally, the width of the region to be truncated at the position of the truncation opening is 2mm-3mm.

Optionally, the width of the solder strip preform is 175mm-185mm.

Optionally, the bonding pad region includes:

a body;

the first welding spots and the second welding spots are respectively positioned at 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 first welding spot and the second welding spot are different in shape; and/or, at least one group of adjacent central lines of the first welding spots and the second welding spots are staggered in the width direction of the body.

Optionally, the body is provided with a slit, and one end of the slit forms an opening in the body.

Optionally, each first welding spot corresponds to a group of slits, and as the distance between the corresponding first welding spot and the length direction increases, the distance between the group of slits and the corresponding first welding spot in the width direction also increases;

and/or, each second welding point corresponds to a group of gaps, and as the distance between the corresponding second welding point and the gap in the length direction increases, the distance between the group of gaps and the corresponding second welding point in the width direction also increases.

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 at a middle position of the group of slits, and the second slit and the third slit are located at two sides of the first slit respectively; the fourth gap is positioned at one side of the second gap, which is away from the first gap, and the fifth gap is positioned at one side of the third gap, which is away from the first gap;

the length of a set of said slits satisfies the following relationship:

L1>L2＝L3>L4＝L5；

wherein L1 is the length of the first slit, L2 is the length of the second slit, L3 is the length of the third slit, L4 is the length of the fourth slit, and L5 is the length of the fifth slit;

and/or the welding zone is connected with a first battery and a second battery, and the body comprises a first connecting part covering the first battery, a second connecting part covering the second battery and a third connecting part covering a gap between the first battery and the second battery;

the size of the welding zone region satisfies the following relation:

d1 =l2, and/or d1=l3;

wherein d1 is the width of the first connecting portion, L2 is the length of the second gap, and L3 is the length of the third gap;

And/or the distance between two adjacent slits in a group of slits satisfies the following relationship:

0.2<L1:(S1+S2)<1.5；

wherein L1 is the length of the first gap, S1 is the distance between the first gap and the second gap, and S2 is the distance between the second gap and the fourth gap;

and/or 0.2< L1 (S3+S4) <1.5;

wherein L1 is the length of the first gap, S3 is the distance between the first gap and the third gap, and S4 is the distance between the third gap and the fifth gap.

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

Optionally, a first slot is formed on the body and corresponds to the first welding spot, and the distance between two opposite sides of the first slot gradually increases towards a direction away from the first welding spot;

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

Optionally, the first slot includes a first bottom point, the second slot includes a second bottom point adjacent to the first bottom point, the first welding point includes a third bottom point adjacent 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 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 by a connecting line of the first bottom point and the second bottom point and the length direction of the body is 75 ° -90 °;

and/or the depth of the first slot is 1mm-3.5mm;

and/or the depth of the second slot is 1mm-3.5mm;

and/or the width of the notch of the first groove is 5mm-15mm;

and/or the width of the notch of the second slotting is 5mm-15mm;

and/or the first slot comprises a first slot edge and a second slot edge which are opposite, wherein the included angle between the first slot edge and the length direction of the body is 10-40 degrees, and/or the included angle between the second slot edge and the length direction is 10-40 degrees;

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

In a second aspect, the present application provides a solder strip preform manufactured using the method for manufacturing a solder strip preform of any one of the above.

Optionally, the solder strip preform comprises a copper substrate and a tin layer coated on the copper substrate; or, the solder strip prefabricated part comprises an aluminum base material and a tin layer coated on the aluminum base material; or, the welding strip prefabricated part is aluminum foil; or, the solder strip prefabricated part is tin foil.

In a second aspect, the present application provides a method for producing a solder strip, including:

manufacturing a solder strip prefabricated part by adopting the production method of the solder strip prefabricated part;

cutting the welding strip prefabricated member in the region to be cut to form a plurality of welding strips.

In a third aspect, the present application provides a solder strip prefabricated member, the solder strip prefabricated member is in the form of a sheet, the solder strip prefabricated member includes to wait to cut district and a plurality of solder strip district that are parallel to each other, a plurality of the both ends in solder strip district with wait to cut the district and link to each other.

In a fourth aspect, the present application provides a solder strip, which is manufactured by the above-mentioned method for manufacturing a solder strip.

In the solder strip prefabricated part, the production method thereof and the solder strip and the production method thereof, the solder strip prefabricated part comprising a plurality of solder strip areas is formed by stamping according to the metal sheet, so that a plurality of solder strips can be cut out at one time based on the solder strip prefabricated part, and the production efficiency can be improved.

Drawings

FIG. 1 is a flow chart of a method of producing a solder strip preform according to an embodiment of the present application;

FIG. 2 is a schematic view of a solder strip preform according to an embodiment of the present application;

FIG. 3 is a schematic view of a solder strip preform according to an embodiment of the present application;

FIG. 4 is a schematic view of a portion of the structure of the solder ribbon preform of FIG. 2;

FIG. 5 is a schematic view of a portion of the structure of the solder ribbon preform of FIG. 3;

FIG. 6 is a schematic illustration of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 7 is a schematic view of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 8 is a schematic view of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 9 is a schematic view of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 10 is a schematic view of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 11 is a schematic illustration of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 12 is a schematic view of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 13 is a schematic view of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 14 is a schematic view of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 15 is a schematic view of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

FIG. 16 is a schematic view of a portion of the structure of a solder ribbon area in a solder ribbon preform according to an embodiment of the present application;

Fig. 17 is a flow chart of a method for producing a solder strip according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Referring to fig. 1, 2 and 3, a method for producing a solder ribbon preform 300 according to an embodiment of the present application includes:

step S11: paving a metal sheet on a stamping table;

step S12: stamping the metal sheet according to a preset pattern to form a solder strip prefabricated member 300; the solder ribbon preform 300 includes a region to be cut 301 and a plurality of solder ribbon regions 302 parallel to each other, and both ends of the plurality of solder ribbon regions 302 are connected to the region to be cut 301.

The solder strip prefabricated member 300 in this embodiment is in a sheet shape, and the solder strip prefabricated member 300 includes a region 301 to be cut off and a plurality of solder strip regions 302 parallel to each other, wherein two ends of the plurality of solder strip regions 302 are connected with the region 301 to be cut off.

According to the production method of the solder strip prefabricated member 300 and the solder strip prefabricated member 300, since the solder strip prefabricated member 300 comprising the plurality of solder strip areas 302 is formed according to stamping of the metal sheet, the plurality of solder strips can be cut at one time based on the solder strip prefabricated member 300, and therefore production efficiency can be improved.

Specifically, the solder strip preform 300 may be formed by stamping a metal sheet according to a predetermined pattern.

It is understood that the land area 302 is complementary to the hollowed-out area.

It will be appreciated that the plurality of solder strips may be formed by cutting the solder strip preform 302 along the dashed lines in fig. 2 and 3.

In particular, the sheet metal may be wrapped in rolls, or may be wrapped in sheets. In step S11, the wrapped sheet metal can be rolled so that the sheet metal is laid flat on a stamping station; or the sheet metal packaged in a piece is taken and tiled on a stamping table; the metal sheets packaged in pieces can be taken out to be a plurality of pieces and laid on a stamping table in a laminated manner.

Specifically, in step S12, the preset pattern may be pre-stored in the press machine before the press. Thus, the preset graph can be timely taken during stamping, and delay is reduced.

Specifically, in step S12, the region 301 to be cut and the plurality of mutually parallel land regions 302 may be simultaneously punched. Thus, the efficiency is high. It can be appreciated that the region 301 to be cut may be formed by punching, and then a plurality of parallel bonding regions 302 may be formed by punching; or punching to form a plurality of parallel welding strip areas 302, and punching to form an area 301 to be cut; it is also possible to punch the bonding pad area 302 of the forming part, punch the to-be-cut area 3011, and punch the bonding pad area 302 of the remaining part. The sequence of the pressing is not limited here.

Specifically, after step S12, in the case of the sheet metal roll packaging, the solder strip preform 300 may also be roll-packaged. In the case of sheet metal sheet packaging, the solder strip preform 300 may also be packaged in sheets. Thus, the transportation is convenient. It will be appreciated that in the case of sheet metal roll packaging, the solder strip preform 300 may also be cut in pieces to form a sheet package.

Specifically, after step S12, the solder ribbon preform 300 may be removed from the stamping station and advanced to step S11, thereby cyclically performing the production of the solder ribbon preform 300.

Specifically, in the examples of fig. 2 and 3, only 10 land areas 302 are shown.

It is understood that a sheet of solder ribbon preform 300 may form 2, 3, 4, 5, 11, 12, or other numbers of solder ribbon regions 302.

Specifically, in the examples of fig. 2 and 3, the spacing between the plurality of land areas 302 is the same. Thus, the novel plastic plate is attractive in appearance, convenient to manufacture, beneficial to improving efficiency, and capable of fully utilizing the metal sheet to avoid waste. It is understood that in other embodiments, the spacing between the plurality of land areas 302 may be different.

Specifically, the width D11 of the solder strip preform 300 is 175mm-185mm. For example 175mm, 176mm, 177mm, 178mm, 179mm, 180mm, 181mm, 182mm, 183mm, 184mm, 185mm. In this way, the width D11 of the solder strip preform 300 is in a proper range, so that the defect that the solder strip length is insufficient due to too small width D11 of the solder strip preform 300 is avoided, and too many parts to be cut due to too long width D11 of the solder strip preform 300 can be avoided, thereby avoiding waste.

Preferably, the width D11 of the solder strip preform 300 is 182mm. The width D11 of the land area at this time was 176mm.

Referring to fig. 4 and 5, optionally, the region 301 to be cut is provided with positioning holes 3011, and each positioning hole 3011 corresponds to one of the bonding pad regions 302. Thus, the cutting precision can be improved by accurately positioning through the positioning holes 3011 during cutting.

Further, the positioning hole 3011 is circular. Therefore, when the positioning piece matched with the positioning hole 3011 is positioned by contact with the positioning hole 3011, the positioning piece can be matched only by aligning the circle center without adjusting the angle, and the positioning efficiency is improved.

It will be appreciated that in other embodiments, the pilot holes 3011 may be square, rectangular, triangular, oval, racetrack, or other shapes.

Further, the shape of the positioning hole 3011 corresponding to each land area 302 is the same. Thus, the efficiency is advantageously improved. It is understood that the corresponding alignment holes for each land area 302 may also be different.

Further, each land area 302 corresponds to two positioning holes 3011, and one positioning hole 3011 corresponds to one end of one land area 302. In this way, the positioning holes 3011 are respectively arranged at the two ends of the welding zone 302, so that the cutting-off of the two ends of the welding zone 302 is more accurate.

It will be appreciated that one, three, four, five or other number of pilot holes 3011 may be provided per land area 302.

Further, the positioning hole 3011 has a diameter of 1.2mm to 1.3mm. For example, 1.2mm, 1.21mm, 1.23mm, 1.25mm, 1.28mm, 1.29mm, 1.3mm. In this way, the diameter of the positioning hole 3011 is in a proper range, so that the difficulty in positioning caused by too small diameter of the positioning hole 3011 is avoided, and the too low mechanical strength of the solder strip preform 300 caused by too large diameter of the positioning hole 3011 is avoided.

Preferably, the positioning hole 3011 has a diameter of 1.25mm. Therefore, the positioning difficulty and the mechanical strength are considered, so that the overall effect is best.

Referring to fig. 4 and 5, the region to be cut 301 is optionally provided with cut holes 3012, and each cut hole 3012 is located at two ends of the bonding pad region 302. Therefore, only the edge of the hole is required to be cut off during cutting, so that cutting is easier, and efficiency is improved.

Specifically, the cutoff hole 3012 is in the form of a racetrack. The length direction of the racetrack is parallel to the width direction of the land area 302. Thus, the length of the land 302 is narrower, and the cut-off holes 3012 are prevented from excessively occupying the edges of the land 302.

It will be appreciated that in other embodiments, the cutoff holes 3012 may also be circular, oval, rectangular, square, or other shapes.

Referring to fig. 4 and fig. 5 together, optionally, the region to be cut 301 is provided with cuts 3013, and each cut 3013 is located at two ends in the length direction of the solder strip region 302 and at two ends in the width direction of the solder strip region 302. Thus, the cutting is easier, and the efficiency is improved.

Note that the width direction of the solder strip region 302 may be the length direction of the solder strip preform 300, and the length direction of the solder strip region 302 may be the width direction of the solder strip preform 300. In other words, the plurality of land areas 302 are arranged parallel to each other along the length direction of the metal sheet. Therefore, when the metal sheet is coiled and packaged, the manufacturing is convenient.

Specifically, the width of the cutoff hole 3013 is the same as the width of the cutoff hole 3012. In this way, the edges of the solder tape at the cut-off ports 3013 and the cut-off holes 3012 are made to correspond in the width direction of the solder tape.

Specifically, the width D12 of the region 301 to be truncated at the cutout 3013 is 2mm to 3mm. For example, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm. In this way, the width D12 of the region 301 to be cut at the cut 3013 is in a suitable range, which can avoid wasting materials caused by too large width D12 of the region 301 to be cut at the cut 3013, and also avoid too small diameter of the positioning hole 3011 caused by too small width D12 of the region 301 to be cut at the cut 3013, thereby being beneficial to ensuring the positioning accuracy.

Preferably, the width D12 of the region 301 to be truncated at the cutout 3013 is 2.6mm. Therefore, the cost saving and the accurate positioning are considered, and the whole effect is best.

Specifically, the center point of the positioning hole 3011 is on the center line of the region 301 to be truncated at the cutout 3013. In this way, the positioning hole 3011 is located at a relatively central position of the to-be-cut-off region 301, so that breakage due to the fact that the positioning hole 3011 is relatively close to the edge of the to-be-cut-off region 301 is avoided.

Referring to fig. 2, 6 and 7, the bonding pad area 10 optionally includes a body 101, a plurality of first bonding pads 11 and a plurality of second bonding pads 12. The plurality of first pads 11 and the plurality of second pads 12 are located on both sides of the body 101 in the width direction, respectively. Each first solder joint 11 extends outwardly from one side of the body 101. Each second weld 12 extends outwardly from the other side of the body 101. The first welding spot 11 and the second welding spot 12 are different in shape; and/or at least one group of adjacent centerlines of the first welding spot 11 and the second welding spot 12 are staggered in the width direction of the body 101.

In this way, since the first welding spots 11 and the second welding spots 12 respectively located at both 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, the expansion stress can be better absorbed by the deformation of the welding strip region 10, and the damage of the stress to the solar cell can be minimized.

It will be appreciated that cutting the solder ribbon preform 300 along the dashed line in fig. 2, the plurality of solder ribbon regions 10 of the solder ribbon preform 300, then forms a plurality of solder ribbons.

It will be appreciated that the land areas 10 absorb stresses in the length direction, width direction and thickness direction by deformation.

Specifically, in the case where the land area 10 is deformed, the closer to the first pad 11 or the second pad 12, the stress is greater on a line segment formed by connecting the adjacent first pad 11 and second pad 12.

It will be appreciated that the different shapes or offset centerlines of the two side pads may result in an asymmetrical shape for the strap region 10.

It will be appreciated that the welding spots on both sides of the body 101 are offset, so that there is a longer body 101 between the welding spots to absorb the amount of stress deformation, and thus, the tensile deformation and the torsional deformation can be absorbed better.

It will be appreciated that the "first solder joint 11 is shaped differently from the second solder joint 12; and/or, 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, including three cases: the shapes of the first welding spots 11 and the second welding spots 12 are different, and the central 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 shapes of the first welding spot 11 and the second welding spot 12 are different, and the central lines of all adjacent first welding spots 11 and second welding spots 12 are overlapped in the width direction of the body 101; the first welding spot 11 and the second welding spot 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 offset in the width direction of the body 101. The last case is explained and illustrated herein as an example, but this does not represent a limitation to the above case.

It will be appreciated that the "center lines of at least one set of adjacent first welding spots 11 and second welding spots 12 are offset in the width direction of the body 101" may be the center lines of one set of adjacent first welding spots 11 and second welding spots 12 are offset in the width direction of the body 101; the center lines of the adjacent first welding spots 11 and the second welding spots 12 may be staggered in the width direction of the body 101, and the center lines of the remaining adjacent first welding spots 11 and second welding spots 12 overlap in the width direction of the body 101; the center lines of all adjacent first pads 11 and second pads 12 may be offset in the width direction of the body 101. The last case is explained and illustrated herein as an example, but this does not represent a limitation to the above case.

It is understood that "staggered in the width direction of the body 101" means that there is no overlap in the width direction.

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

Referring to fig. 7, alternatively, the line connecting the first welding spot 11 and the second welding spot 12 closest to the first welding spot 11 forms an angle with the length direction of the welding strip 10, and the angle γ is 20 ° -60 °. Therefore, the first welding spot 11 and the second welding spot 12 are properly staggered, so that the deformation of the welding strip 10 is favorable for better absorbing the expansion stress, and the damage of the stress to the battery is 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 °. Thus, the first welding point 11 and the second welding point are staggered to the most proper degree.

Referring to fig. 7, the thickness of the land area 10 is optionally 0.1mm-0.3mm. For example, 0.1mm, 0.12mm, 0.14mm, 0.18mm, 0.2mm, 0.21mm, 0.25mm, 0.27mm, 0.3mm. In this way, the thickness of the bonding-strap region 10 is in a proper range, so that the problem that the effect of absorbing the expansion stress by the bonding-strap region 10 is poor or the mechanical strength of the bonding-strap region 10 is poor due to the too small thickness is avoided, and the problem that the cost of the bonding-strap region 10 is high due to the too large thickness of the bonding-strap region 10 can be avoided.

Preferably, the thickness of the land area 10 is 0.14mm. Thus, the effect of absorbing the expansion stress, the mechanical strength and the cost of the welding zone 10 are taken into consideration, and the overall effect is the best.

Referring to fig. 7, the bonding pad region 10 may alternatively comprise a copper substrate and a tin layer coated on the copper substrate. In this way, the conductivity of the solder strip 10 is better, so that the effect of electrically connecting the solar cells is better.

Specifically, the hardness of the land area 10 ranges from 40HV to 60HV. For example 40HV, 42HV, 45HV, 48HV, 50HV, 53HV, 55HV, 59HV, 60HV. Thus, the mechanical strength of the land 10 is good.

Specifically, the uniformity of the tin layer was ±10%. For example, -10%, -8%, -5%, -2%, 0%, 1%, 5%, 7%, 10%. Thus, the conductivity of the land area 10 is good.

Specifically, the thickness of the tin layer is 6 μm to 10 μm. For example, 6 μm, 6.2 μm, 7 μm, 7.5 μm, 8 μm, 9 μm, 10 μm.

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

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

Referring to fig. 7, the body 101 may alternatively be rectangular. Thus, the body 101 is regular in shape and convenient to manufacture.

Referring to fig. 8, alternatively, the body 101 is bent, and the first welding point 11 and the second welding point 12 are disposed at the bending angle. In this way, the stress to which the solar cell is subjected is reduced by the bent body 101, and damage to the solar cell is reduced. Meanwhile, the bending angle can assist in positioning the first welding spot 11 and the second welding spot 12, so that the manufacturing efficiency is improved. Further, the bending angle is an obtuse angle. Therefore, the angle of the bending angle is larger, and the stress born by the solar cell can be further reduced. Further, each bending angle is provided with a first welding point 11 or a second welding point 12.

It will be appreciated that in other embodiments, the body 101 may be alternately connected by a rectangular shape and a bent shape, 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 may be at least two of an acute angle, a right angle, an obtuse angle, and an arc angle; in other embodiments, some of the corners may be provided with first or second welds 11, 12, and the remaining corners may not be provided with first and second welds 11, 12.

Referring to fig. 7, the width w0 of the body 101 is optionally 2.3mm-6mm. For example, 2.3mm, 2.4mm, 2.8mm, 3mm, 3.35mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.8mm, 6mm. In this way, the width w0 of the body 101 is in a proper range, so that the problem that the effect of absorbing the expansion stress by the solder strip region 10 is poor or the solder strip region 10 is difficult to connect with a solar cell due to the too small width w0 of the body 101 can be avoided, and the problem that the cost of the solder strip region 10 is high due to the too large width w0 of the body 101 can be avoided. The tolerance of the width w0 of the body 101 may be + -0.1 mm.

Preferably, the width w0 of the body 101 is 3.35mm. Thus, the effect of absorbing the expansion stress of the welding zone 10 is considered, the solar cell and the cost are connected, and the whole effect is best.

Referring to fig. 7, the length L0 of the body 101 is alternatively 170mm-220mm. For example 170mm, 176mm, 180mm, 182mm, 210mm, 218mm, 220mm. The tolerance of the length L0 of the body 101 may be ±0.1mm.

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

Referring to fig. 7, alternatively, 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 welding spots 12 extends outward in the width direction of the body 101 from the other side of the body 101. Thus, the first welding spots 11 and the second welding spots 12 are regularly arranged, and the manufacturing is convenient.

It will be appreciated that in other embodiments, each first welding point 11 may extend outward from one side of the body 101 at an acute angle or an obtuse angle with respect to the width direction of the body 101; part of the first welding spots 11 can extend outwards from one side of the body 101 along the width direction of the body 101, and the directions of the other first welding spots 11 extending outwards from one side of the body 101 form acute angles or obtuse angles with the width direction of the body 101; each second welding point 12 may extend outward from one side of the body 101 in a direction forming an acute angle or an obtuse angle with the width direction of the body 101; part of the second welding spots 12 may extend outward from one side of the body 101 in the width direction of the body 101, and the directions in which the rest of the second welding spots 12 extend 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. Specifically, in the case where the plurality of first welding spots 11 form an acute angle or an obtuse angle with the width direction of the body 101, the angles formed by the plurality of first welding spots 11 may be the same or different; in the case where the plurality of second welding spots 12 form an acute angle or an obtuse angle with the width direction of the body 101, the angles formed by the plurality of second welding spots 12 may be the same or different.

Referring to fig. 7, alternatively, a plurality of first welding spots 11 are distributed at equal intervals along the length direction of the body 101 at one side of the body 101. Alternatively, the plurality of second welding spots 12 are equally spaced apart along the length direction of the body 101 at the other side of the body 101. In this way, the body 101 between each section of the first welding spot 11 and the second welding spot 12 has the same capability of absorbing the expansion 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 staggered central lines of the adjacent welding spots are also convenient to ensure.

Specifically, the distance between the adjacent first welding spots 11 and the second welding spots 12 may be equal to the distance between the adjacent two first welding spots 11, and may be equal to the distance between the adjacent two second welding spots 12. In other words, the pitch of two adjacent pads is equal. For example, for a battery with a side length of 182mm, the first welding spots 11 may be 5-15, the second welding spots 12 may be 5-15, and the distance between two adjacent welding spots may be 6m-20mm.

In other embodiments, the spacing between two adjacent first pads 11 may be different; the spacing between two adjacent first welding spots 11 may be the same in part, and the spacing between the other two adjacent first welding spots 11 is different; similarly, the spacing between adjacent second pads 12 may be different; the spacing between some adjacent second pads 12 may be the same and the spacing between the remaining adjacent second pads 12 may be different. The specific arrangement of the solder joints is not limited herein.

Referring to fig. 7, alternatively, the spacing S0 between adjacent first and second pads 11 and 12 in the width direction of the body 101 is 6mm to 20mm. For example 6mm, 6.5mm, 8mm, 10mm, 11.375mm, 13mm, 15mm, 18mm, 20mm. Further, the spacing S0 between the adjacent first and second pads 11, 12 in the width direction of the body 101 is 10mm to 15mm. For example 10mm, 11.375mm, 13mm, 15mm. Therefore, S0 is in a proper range, the poor effect of absorbing the telescopic stress caused by poor deformability due to overlarge or undersize S0 is avoided, and the damage of the stress to the solar cell is reduced. The tolerance + -of the spacing S0 may be 0.02.

Preferably, the spacing S0 between adjacent first and second pads 11, 12 in the width direction of the body 101 is 11.375mm. In this way, the effect of reducing the damage of the stress to the solar cell is best.

Alternatively, the first welding spot 11 has a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, and a trapezoid shape. Alternatively, the second weld 12 is rectangular, rounded rectangular, circular, semi-circular, trapezoidal.

Specifically, in the example of fig. 7, the plurality of first pads 11 and the plurality of second pads 12 each have a rounded rectangle. Further, the radius of the chamfer is 0.2mm-0.4mm. For example, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.31mm, 0.35mm, 0.39mm, 0.4mm. Preferably, the chamfer has a radius of 0.3mm.

It will be appreciated that in other examples, the shapes of the first and second pads 11, 12 may also be different; the shape of part of the first welding spots 11 may be the same as the shape of the rest of the first welding spots 11, or the shape of all the first welding spots 11 may be different; the shape of a part of the second welding spots 12 may be the same as the shape of the remaining second welding spots 12, or the shape of all the second welding spots 12 may be different.

Alternatively, the first weld 11 extends from the body 101 by a length of 1.5mm to 1.7mm. For example, 1.5mm, 1.52mm, 1.55mm, 1.6mm, 1.63mm, 1.65mm, 1.68mm, 1.7mm. The tolerance of the length of the first welding spot 11 protruding from the body 101 is + -0.05. Preferably, the first weld 11 extends from the body 101 by a length of 1.6mm.

Alternatively, the width of the first spot weld 11 is 2.4mm-2.6mm. For example, 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, 2.6mm. The tolerance of the width of the first solder joint 11 is + -0.05. Preferably, the width of the first spot weld 11 is 2.5mm.

Optionally, the second weld spot 12 extends from the body 101 by a length of 0.8mm to 1.1mm. For example, 0.8mm, 0.82mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm. The tolerance of the length of the first welding spot 11 protruding from the body 101 is + -0.05. Preferably, the first weld 11 extends from the body 101 by a length of 0.95mm.

Alternatively, the width of the second spot weld 12 is 2.4mm-2.6mm. For example, 2.4mm, 2.42mm, 2.45mm, 2.5mm, 2.53mm, 2.55mm, 2.58mm, 2.6mm. The tolerance of the width of the second spot weld 12 is + -0.05. Preferably, the width of the first spot weld 11 is 2.5mm.

Referring to fig. 9 and 10, the body 101 is optionally provided with a slit 13, and one end of the slit 13 forms an opening in the body 101. In this way, since the body 101 is provided with the slit 13 and one end of the slit 13 is opened in the body 101, the deformation of the solder strip 10 can be absorbed by the slit 13, and the damage of the stress to the solar cell can be reduced.

It will be appreciated that the strap region 10 compresses or expands when stressed, so that the expansion and contraction stresses can be better absorbed by deformation of the strap 13.

It will be appreciated that the slit 13 is elongate, with one end and the other end of the slit 13 being referred to as the ends of the slit 13 in the length direction.

Specifically, in the examples of fig. 9 and 10, the slit 13 is rectangular. Thus, the slit 13 is regular in shape and convenient to manufacture. It will be appreciated that in other examples, the slot 13 may be oval, racetrack, or other irregular shape.

Further, in the case where the slit 13 is rectangular and the longitudinal direction of the slit 13 coincides with the width direction of the body 101, the length of the slit 13 refers to the dimension of the slit 13 in the width direction of the 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 examples of fig. 9 and 10, the number of slits 13 is plural. In this way, the capacity of the welding zone 10 for absorbing the expansion stress is stronger through the plurality of gaps 13, which is beneficial to further reducing the damage of the stress to the solar cell. It will be appreciated that in other embodiments the number of slits 13 may be one.

Specifically, in the example of fig. 9 and 10, the openings of the slits 13 are formed on both sides in the width direction of the body 101. In this way, the body 101 can deform at two sides of the width direction through the gaps 13, so that the deformation range is enlarged, the capacity of the welding strip for absorbing the expansion stress is stronger, and the damage of the stress to the solar cell is further reduced. It will be appreciated that in other embodiments, the opening of the slit 13 may be formed on only one side in the width direction of the body 101; or may be formed on one or both sides of the body 101 in the length direction.

Referring to fig. 9, optionally, each first welding point 11 corresponds to a set of slits 13, and as the distance from the corresponding first welding point 11 in the length direction increases, the distance from the set of slits 13 to the corresponding first welding point 11 in the width direction also increases. Alternatively, each second welding spot 12 corresponds to a set of slits 13, and as the distance from the corresponding second welding spot 12 in the length direction increases, the distance from the set of slits 13 to the corresponding second welding spot 12 in the width direction also increases. In this way, the welding zone 10 is enabled to transmit current better, and the effect of absorbing stress by the welding zone 10 is enabled to be better.

Specifically, the number of slits 13 in the group of slits 13 corresponding to the first welding spot 11 is 5, and the number of slits 13 in the group of slits 13 corresponding to the second welding spot 12 is 5.

It will be appreciated that in other embodiments, the number of slits 13 in the set of slits 13 corresponding to the first welding point 11 and the number of slits 13 in the set of slits 13 corresponding to the second welding point 12 may be different; the number of slits 13 in the group of slits 13 corresponding to the first welding spot 11 may be 2, 3, 4, 6 or other numbers; the number of slits 13 in the set of slits 13 corresponding to the second solder joint 12 may be 2, 3, 4, 6 or other.

It will be appreciated that in other embodiments, each first welding spot 11 may correspond to a set of slits 13, and as the distance from the corresponding first welding spot 11 in the length direction increases, the distance from the set of slits 13 to the corresponding first welding spot 11 in the width direction decreases. In other embodiments, each second welding spot 12 may correspond to a set of slits 13, and as the distance from the corresponding second welding spot 12 in the length direction increases, the distance from the set of slits 13 to the corresponding second welding spot 12 in the width direction decreases. In this way, the welding zone 10 can transmit current better, and the effect of absorbing stress by the welding zone 10 is better.

Referring to fig. 9, alternatively, in the case where the number of slits 13 in the group of slits 13 corresponding to the first welding point 11 is an odd number, the group of slits 13 is symmetrical with respect to the center line of the middle slit 13. In this way, the group of slits 13 are symmetrically arranged, which is convenient for manufacturing and is also beneficial to better absorbing the expansion stress through the deformation of the welding zone 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 intermediate slit 13 coincides with the center line 111 of the corresponding first welding spot. In this way, the middle slit 13 is conveniently positioned according to the first welding spot 11, or the first welding spot 11 is conveniently positioned according to the middle slit 13, which is beneficial to improving the production efficiency.

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 slit 13 in the middle. In this way, the group of slits 13 are symmetrically arranged, which is convenient for manufacturing and is also beneficial to better absorbing the expansion stress through the deformation of the welding zone 10.

Further, the center line of the intermediate slit 13 coincides with the center line of the corresponding second welding spot 12. Thus, it is convenient to position the intermediate slit 13 according to the second welding spot 12, or to position the second welding spot 12 according to the intermediate slit 13, which is advantageous in improving production efficiency.

Referring to fig. 10, alternatively, the corresponding group of slits 13 of the first welding spot 11 may have equal distances from the corresponding first welding spot 11 in the width direction and equal distances from the corresponding first welding spot 11 in the length direction. Thus, the manufacturing is convenient, and the production efficiency is improved.

Specifically, in a group of slits 13 corresponding to the first welding spot 11, the number of slits 13 is 2, and the slits are symmetrical about a center line 111 of the first welding spot; the number of slits 13 in the group of slits 13 corresponding to the second welding spot 12 is 2, and the slits are symmetrical about the center line of the second welding spot 12.

Referring to fig. 10, alternatively, in the case where the number of slits 13 in the group of slits 13 corresponding to the first welding point 11 is an even number, the group of slits 13 is symmetrical about the center line of the middle two slits 13. In this way, the group of slits 13 are symmetrically arranged, which is convenient for manufacturing and is also beneficial to better absorbing the expansion stress through the deformation of the welding zone 10.

Note that the central 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 central lines of the two slits 13 in the middle coincide with the central lines 111 of the corresponding first welding spots. In this way, it is convenient to position the middle two slits 13 according to the first welding point 11, or to position the first welding point 11 according to the middle two slits 13, which is advantageous in improving the production efficiency.

Similarly, in the case where the number of slits 13 in the group of slits 13 corresponding to the second welding point 12 is even, the group of slits 13 is symmetrical with respect to the center line of the middle two slits 13. In this way, the group of slits 13 are symmetrically arranged, which is convenient for manufacturing and is also beneficial to better absorbing the expansion stress through the deformation of the welding zone 10.

Further, the central lines of the two slits 13 in the middle coincide with the central lines of the corresponding second welding spots 12. In this way, it is convenient to position the middle two slits 13 according to the second welding spot 12, or to position the second welding spot 12 according to the middle two slits 13, which is advantageous in improving the production efficiency.

Referring to fig. 11, 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, where the first slit 131 is located at a middle position of the group of slits 13, and the second slit 132 and the third slit 133 are located at two sides of the first slit 131 respectively; the fourth slit 134 is located at a side of the second slit 132 facing away from the first slit 131, and the fifth slit 135 is located at a side of the third slit 133 facing away from the first slit 131; the length of the set of slits 13 satisfies the following relationship:

L1>L2＝L3>L4＝L5；

where L1 is the length of the first slit 131, L2 is the length of the second slit 132, L3 is the length of the third slit 133, L4 is the length of the fourth slit 134, and L5 is the length of the fifth slit 135.

In this way, as the distance between the five slits 13 and the corresponding welding spot in the length direction increases, the distance between the five slits 13 and the corresponding welding spot in the width direction also increases, and the lengths of the five slits 13 are symmetrical with respect to the first slit 131 located in the middle, which is beneficial to better absorbing the expansion stress through the deformation of the welding zone 10.

Referring to fig. 11, the length L1 of the first slit 131 is alternatively 1.75mm-1.85mm. For example 1.75mm, 1.8mm, 1.82mm, 1.83mm, 1.84mm, 1.85mm. Preferably, the length L1 of the first slit 131 is 1.8mm.

Alternatively, the length L2 of the second slit 132 is 1.5mm-1.7mm. For example 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7mm. Preferably, the length L2 of the second slit 132 is 1.6mm.

Optionally, the length L3 of the third slit 133 is 1.5mm-1.7mm. For example 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7mm. Preferably, the length L3 of the third slit 133 is 1.6mm.

Optionally, the length L4 of the fourth slit 134 is 0.6mm-0.8mm. For example 0.6mm, 0.65mm, 0.68mm, 0.7mm, 0.75mm, 0.8mm. Preferably, the length L4 of the fourth slit 134 is 0.7mm.

Optionally, the length L5 of the fifth slit 135 is 0.6mm-0.8mm. For example 0.6mm, 0.65mm, 0.68mm, 0.7mm, 0.75mm, 0.8mm. Preferably, the length L5 of the fifth slit 135 is 0.7mm.

Referring to fig. 11, alternatively, the strap 10 connects the first and second batteries, 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 and second batteries; the dimensions of the land area 10 satisfy the following relationship:

d1 =l2, and/or d1=l3;

where d1 is the width of the first connection portion 1011, L2 is the length of the second slit 132, and L3 is the length of the third slit 133.

In this way, the length of the second slit 132 and/or the third slit 133 is equal to the width of the first connection portion 1011, so that the deformation capability of the portion where the body 101 contacts the solar cell is stronger, the capability of absorbing the expansion stress is stronger, and the damage of the stress to the solar cell can be further reduced.

Referring to fig. 11, optionally, the distance between two adjacent slits 13 in a set 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 that the stretching stress is better absorbed, and the damage of the stress to the solar cell is minimized.

Specifically, the value of L1 (S3+S4) is, for example, 0.21, 0.22, 0.37, 0.8, 0.9, 1, 1.3, 1.49.

In the example of FIG. 11, the value of L1 (S3+S4) is 0.37. L1 is 1.8mm, S3 is 2.9mm, and S4 is 2mm.

Referring to fig. 11, alternatively, the width d1 of the first connection portion 1011 is 1.5mm to 1.7mm. For example 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7mm. Preferably, the width d1 of the first connection portion 1011 is 1.6mm.

Alternatively, the width d2 of the second connection portion 1012 is 1.5mm-1.7mm. For example 1.5mm, 1.55mm, 1.58mm, 1.6mm, 1.65mm, 1.7mm. Preferably, the width d2 of the second connection portion 1012 is 1.6mm.

Alternatively, the width d3 of the third connection part 1013 is 0.1mm to 2mm. For example, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.8mm, 1mm, 1.5mm, 1.7mm, 2mm. Preferably, the width d3 of the third connection part 1013 is 0.15mm.

Optionally, the welding strip area 10 is connected with a first battery and a second battery, the first welding spot 11 is connected with the positive electrode of the first battery, the second welding spot 12 is connected with the negative electrode of the second battery, and the area of the first welding spot 11 is larger than or equal to that of the second welding spot 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 appreciated that since the current of the positive electrode is greater than that of the negative electrode, the width of the corresponding connection portion of the positive electrode can be made larger, so that the structure of the welding strip is more matched with that of the battery.

Specifically, the area of the first welding spot 11 is greater than or equal to the area of the second welding spot 12, and the width of the first welding spot 11 is the same as the width of the second welding spot 12, and the length of the first welding spot 11 is greater than the length of the second welding spot 12; the lengths of the first welding spot 11 and the second welding spot 12 are the same, and the width of the first welding spot 11 is larger than that of the second welding spot 12; it is also possible that the length of the first welding spot 11 is larger than the length of the second welding spot 12, and that the width of the first welding spot 11 is larger than the width of the second welding spot 12.

Referring to fig. 11, alternatively, the number of slits 13 is plural, and the extending directions of the slits 13 are 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 to the solar cell due to the stress can be reduced. In addition, the extending directions of the plurality of slits 13 are parallel to each other, which is convenient for manufacturing and is beneficial to improving the production efficiency.

It will be appreciated that in other embodiments, the direction of extension of all slots 13 may be at an angle to the width of body 101; the extending direction of part of the slits 13 may be angled with respect to the width direction of the body 101, and the extending direction of the remaining slits 13 may be parallel with respect to the width direction of the body 101. Further, in the case where the extending direction of the plurality of slits 13 is angled with respect to the width direction of the body 101, the plurality of slits 13 may or may not be parallel to each other.

Referring to fig. 11, alternatively, the width w1 of the slit 13 is 0.2mm-0.6mm. For example 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm. Thus, the width w1 of the slit 13 is in a suitable range, so that poor deformation capability of the solder strip region 10 caused by too small width w1 of the slit 13 is avoided, and poor strength of the solder strip region 10 caused by too large width w1 of the slit 13 is avoided. The tolerance of the width w1 of the slit 13 may be ±0.05. Preferably, the width w1 of the slit 13 is 0.4mm. In this way, the deformability and mechanical strength of the solder strip region 10 can be combined, and the overall effect is the best.

Specifically, in the example of fig. 11, 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. 11, alternatively, the spacing between two adjacent slits 13 is 1.5mm-4mm. For example, 1.5mm, 1.8mm, 1.9mm, 2.0mm, 2.5mm, 2.9mm, 3mm, 3.5mm, 4mm. In this way, the distance between the two adjacent slits 13 is in a proper range, so that the poor mechanical strength of the welding zone 10 caused by the too small distance between the two adjacent slits 13 is avoided, and the poor deformability of the welding zone 10 caused by the too large distance between the two adjacent slits 13 can be avoided.

Specifically, the pitch of the adjacent two slits 13 refers to the distance of the center lines of the adjacent two slits 13. S1 in fig. 11 is a distance between the first slit 131 and the second slit 132, which is 2.9mm; s2 is the distance between the second gap 132 and the fourth gap 134, which is 2mm; s3 is the distance between the first gap 131 and the third gap 133, which is 2.9mm; s4 is the distance between the third gap 133 and the fifth gap 135, which is 2mm. The tolerance is + -0.01.

Specifically, in the group of slits 13, the pitches of the adjacent two slits 13 may be the same or may be different. Under the condition that the spacing between two adjacent slits 13 is the same, the spacing between two adjacent slits 13 is a fixed value within the range of 1.5mm-4 mm; in the case where the pitches of the adjacent two slits 13 are not the same, the pitches of the adjacent two slits 13 are a plurality of values in the range of 1.5mm to 4 mm.

Referring to fig. 11, alternatively, the distance D1 between two adjacent sets of slits 13 is 1.5mm-15mm. For example, 1.5mm, 1.575mm, 2mm, 5mm, 8mm, 10mm, 12mm, 15mm. In this way, the distance D1 between two adjacent groups of slits 13 is in a proper range, so that the poor mechanical strength of the welding strip region 10 caused by too small distance D1 between two adjacent groups of slits 13 is avoided, and the poor deformation capability of the welding strip region 10 caused by too large distance D1 between two adjacent groups of slits 13 is also avoided. Preferably, the distance D1 between two adjacent groups of slits 13 is 1.575mm. Specifically, the pitch of two adjacent sets of slits 13 refers to the distance between two slits 13 belonging to the two sets of slits 13 and closest to each other, respectively.

Referring to fig. 12, optionally, the body 101 is further provided with a through hole 14, and the other end of the slit 13 is in communication with the through hole 14. In this way, the deformation of the solder strip region 10 can be absorbed through the through hole 14, and the damage of the stress to the solar cell can be reduced. Moreover, the slit 13 communicates with the through hole 14, so that the effect of absorbing the deformation of the solder strip 10 is better.

Specifically, the number of 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. 12, the through holes 14 corresponding to the second slits 132 and the third slits 133 have an elliptical shape, and the short axis length is greater than the width of the gap between the first cell and the second cell. The through holes 14 corresponding to the second slit 132 and the third slit 133 are offset from the third connection part 1013.

Referring to fig. 12, alternatively, the major axis of the through hole 14 corresponding to the first slit 131 is 2.3mm-2.5mm. For example 2.3mm, 2.32mm, 2.38mm, 2.4mm, 2.45mm, 2.5mm. Preferably, the major axis of the through hole 14 corresponding to the first slit 131 is 2.4mm.

Referring to fig. 12, alternatively, the short axis of the through hole 14 corresponding to the first slit 131 is 0.9mm-1.1mm. For example, 0.9mm, 0.92mm, 0.95mm, 1mm, 1.05mm, 1.1mm. Preferably, the short axis of the through hole 14 corresponding to the first slit 131 is 1mm.

Referring to fig. 12, alternatively, the long axis of the through hole 14 corresponding to the second slit 132 is 1.9mm-2.1mm. For example, 1.9mm, 1.92mm, 1.95mm, 2mm, 2.05mm, 2.07mm, 2.1mm. Preferably, the long axis of the through hole 14 corresponding to the second slit 132 is 2mm.

Referring to fig. 12, alternatively, the short axis of the through hole 14 corresponding to the second slit 132 is 0.75mm-0.85mm. For example 0.75mm, 0.76mm, 0.78mm, 0.8mm, 0.81mm, 0.84mm, 0.85mm. Preferably, the minor axis of the through hole 14 corresponding to the second slit 132 is 0.8mm.

Referring to fig. 12, optionally, the major axis of the through hole 14 corresponding to the third slit 133 is 1.9mm-2.1mm. For example, 1.9mm, 1.92mm, 1.95mm, 2mm, 2.05mm, 2.07mm, 2.1mm. Preferably, the major axis of the through hole 14 corresponding to the third slit 133 is 2mm.

Referring to fig. 12, alternatively, the short axis of the through hole 14 corresponding to the third slit 133 is 0.75mm-0.85mm. For example 0.75mm, 0.76mm, 0.78mm, 0.8mm, 0.81mm, 0.84mm, 0.85mm. Preferably, the short axis of the through hole 14 corresponding to the third slit 133 is 0.8mm.

Referring to fig. 12, optionally, the long axis of the through hole 14 corresponding to the fourth slit 134 is 1.1mm-1.3mm. For example, 1.1mm, 1.11mm, 1.14mm, 1.2mm, 1.25mm, 1.27mm, 1.3mm. Preferably, the long axis of the through hole 14 corresponding to the fourth slit 134 is 1.2mm.

Referring to fig. 12, alternatively, the short axis of the through hole 14 corresponding to the fourth slit 134 is 0.5mm-0.7mm. For example 0.5mm, 0.51mm, 0.58mm, 0.6mm, 0.64mm, 0.68mm, 0.7mm. Preferably, the minor axis of the through hole 14 corresponding to the fourth slit 134 is 0.6mm.

Referring to fig. 12, optionally, the major axis of the through hole 14 corresponding to the fifth slit 135 is 1.1mm-1.3mm. For example, 1.1mm, 1.11mm, 1.14mm, 1.2mm, 1.25mm, 1.27mm, 1.3mm. Preferably, the major axis of the through hole 14 corresponding to the fifth slit 135 is 1.2mm.

Referring to fig. 12, optionally, the short axis of the through hole 14 corresponding to the fifth slit 135 is 0.5mm-0.7mm. For example 0.5mm, 0.51mm, 0.58mm, 0.6mm, 0.64mm, 0.68mm, 0.7mm. Preferably, the short axis of the through hole 14 corresponding to the fifth slit 135 is 0.6mm.

Referring to fig. 12, alternatively, four rounded corners are formed at the connection between the first slit 131 and the corresponding through hole 14, and the radii are all 0.2. Referring to fig. 12, alternatively, four rounded corners are formed at the connection between the second slit 132 and the corresponding through hole 14, and the radii are all 0.2. Referring to fig. 12, optionally, four rounded corners are formed at the connection between the third slit 133 and the corresponding through hole 14, and the radii of the rounded corners are all 0.2. Referring to fig. 12, optionally, four rounded corners are formed at the connection between the fourth slit 134 and the corresponding through hole 14, and the radii of the rounded corners are all 0.1. Referring to fig. 12, optionally, four rounded corners are formed at the connection between the fifth slit 135 and the corresponding through hole 14, and the radii are all 0.1.

Referring to fig. 13, alternatively, 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 short axis length of the through hole 14 is the width of the gap between the first battery and the second battery, and the long axis of the through hole 14 coincides with the center line 1001 of the body 101.

In this way, the short axis 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 axis of the through hole 14 is parallel to the length direction of the body 101, so that the effect of absorbing the deformation of the welding zone 10 by the through hole 14 is better, and the 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 space between the first cell and the second cell. In this way, the effect of absorbing the deformation of the solder strip 10 by the through hole 14 is better, and the damage of the stress to the battery can be further reduced.

Specifically, in the example of fig. 13, among the through holes 14 corresponding to the group of slits 13, the through holes 14 corresponding to the second slit 132 and the third slit 133 are elliptical, the short axis length is the width of the gap between the first cell and the second cell, and the long axis coincides with the center line 1001 of the body 101. In this way, the deformation of the 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 will be appreciated that in other examples, all the through holes 14 corresponding to the group of slits 13 may be elliptical, the short axis length is the width of the gap between the first cell and the second cell, and the long axis coincides with the center line 1001 of the body 101.

It will be appreciated 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 have the same shape or may have different shapes. The description is not limited thereto.

Alternatively, in the set of through holes 14 corresponding to each first solder joint 11, two adjacent through holes 14 are offset in the length direction. In this way, the current can be better transferred and the deformation of the land area 10 can be better absorbed.

It will be appreciated that in other embodiments, two adjacent through holes 14 may be partially overlapped or fully overlapped in the length direction in the set of through holes 14 corresponding to each first solder joint 11.

Referring to fig. 12 and 13, alternatively, each first pad 11 corresponds to a set of through holes 14, and as the distance from the corresponding first pad 11 in the length direction increases, both the major axis and the minor axis of the set of through holes 14 decrease. Alternatively, each second solder joint 12 corresponds to a set of through holes 14, and as the distance from the corresponding second solder joint 12 in the length direction increases, both the major axis and the minor axis of the set of through holes 14 decrease. In this way, the welding zone 10 is enabled to transmit current better, and the effect of absorbing stress by the welding zone 10 is enabled to be better.

It will be appreciated that in other embodiments, each first solder joint 11 may correspond to a set of through holes 14, with the long and short axes of a set of through holes 14 increasing with increasing distance from the corresponding first solder joint 11 in the length direction. In other embodiments, each second solder joint 12 may correspond to a set of through holes 14, and as the distance from the corresponding second solder joint 12 in the length direction increases, both the major axis and the minor axis of the set of through holes 14 increase.

Referring to fig. 13, alternatively, the distances between two adjacent slits 13 in a set of slits 13 are equal.

It will be appreciated that the distances between two adjacent slits 13 in a set of slits 13 may be different; or may be partially identical or partially different.

Referring to fig. 14 and 15, optionally, the solder strip 10 further includes a first slot 119 formed in the body 101 and corresponding to the first solder joint 11, and the spacing between two opposite sides of the first slot 119 is gradually increased in a direction away from the first solder joint 11; and/or, the welding zone 10 further comprises a second groove 129 formed on the body 101 and corresponding to the second welding point 12, and the distance between two opposite sides of the second groove 129 is gradually increased towards the direction away from the second welding point 12.

In this way, the distance between the two opposite sides of the slot gradually increases towards the direction away from the welding spot, so that the expansion stress can be better absorbed through the deformation of the welding zone 10, and the damage of the stress to the solar cell is further minimized.

Note that the body 101 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. 14 and 15; in the second case, the body 101 is formed with the first slot 119 and is not formed with the second slot 129; in the third case, the body 101 is formed with the second groove 129, and the first groove 119 is not formed. For convenience of explanation, the first and second grooves 119 and 129 are formed in the body 101 as an example, but this is not meant to limit the foregoing.

Note that the distance between the two opposite sides of the slot gradually increases toward the direction away from the corresponding welding point, and the two opposite sides of the slot may 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.

Note that, the width w0 of the body 101 and the length L0 of the body 101 in fig. 14 are identical to those described above, and are not repeated here to avoid redundancy.

Referring to fig. 15, specifically, since the distances between the two opposite sides of the first slot 119 and the second slot 129 are gradually increased in a direction away from the welding point, two tapered portions 1017 with narrowed width may be formed between the adjacent first welding point 11 and second welding point 12, the boundary ends of the two tapered portions 1017 are non-pivoting lines 1019, and the non-boundary ends of the two tapered portions 1017 are pivoting lines 1018. As such, in the event that the solder strip 10 is subjected to a compressive stress, the pivot line 1018 arches, i.e., bends, at the pivot line 1018, thereby absorbing the compressive stress and minimizing damage to the solar cell from the stress.

It will be appreciated that in the case where the body 101 is formed with the first slot 119 and the second slot 129 is not formed, a tapered portion 1017 is formed between the adjacent first and second welding spots 11 and 12, the narrowest end of the tapered portion 1017 being adjacent to the first welding spot 11 and being formed with the pivot line 1018.

Similarly, in the case where the body 101 is formed with the second groove 129 and the first groove 129 is not formed, a tapered portion 1017 is formed between the adjacent first welding spot 11 and second welding spot 12, the narrowest end of the tapered portion 1017 is adjacent to the second welding spot 12 and a pivot line 1018 is formed.

Specifically, the non-pivot line 1019 corresponds to a cross-sectional area that is greater than the cross-sectional area corresponding to pivot line 1018. The cross section is formed by cutting in the thickness direction of the land area 10. In this way, the solder strip is made more flexible at the pivot line 1018, thereby making the effect of absorbing the telescoping stress better.

Specifically, the thickness of the solder strip region 10 corresponding to the pivot line 1018 is smaller than the thickness of the solder strip region 10 corresponding to the non-pivot line 1019. In this way, the gradation portion 1017 is made to bend better around the pivot line 1018, thereby making the effect of absorbing the expansion stress better.

Referring to fig. 16, alternatively, the first slot 119 and the second slot 129 may be centrosymmetric. 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 centrally symmetrical.

Referring to fig. 16, alternatively, the first slot 119 may be axisymmetric about the center line 111 of the first welding spot 11. The second slot 129 may be axisymmetric about the centerline 121 of the second weld spot 12. 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 axisymmetric.

Referring to fig. 16, alternatively, the apex of the first slot 119 may be located on the centerline 111 of the first weld 11. The apex of the second slot 129 may be located on the centerline 121 of the second weld spot 12. Therefore, the manufacturing is convenient, and the effect of absorbing deformation is better. It is understood that in other embodiments, the apex of the first slot 119 may 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 spot 12.

Referring to fig. 16, the depth H1 of the first slot 119 may alternatively be 1mm-3.5mm. For example, 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, 3.5mm. In this way, the depth H1 of the first groove 119 is made to be in a proper range, so that the effect of absorbing the expansion stress in the width direction of the land region 10 is better. Preferably, the depth H1 of the first slot 119 is 2.85mm.

Optionally, the depth H2 of the second slot 129 is 1mm-3.5mm. For example, 1mm, 1.5mm, 2mm, 2.5mm, 2.85mm, 3mm, 3.5mm. In this way, the depth of the second groove 129 is made to be in a proper range, so that the effect of absorbing the expansion stress in the width direction of the land region 10 is better. Preferably, the depth H2H1 of the second slot 129 is 2.85mm.

Specifically, the depth of the slot is the distance from the apex of the slot to the corresponding edge 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. In this way, easy breakage caused by too deep one slot and too shallow the other slot is avoided. It is understood that in other embodiments, the depth H1 of the first slot 119 and the depth H2 of the second slot 129 may also be different.

Alternatively, the opposite sides of the first slot 119 may be in a straight line, a curved line, a broken line, other line, or a combination of at least two of the foregoing. The line shapes of the two opposite sides of the first slot 119 may be the same or different. In the case where the two opposite sides of the first slot 119 are both straight, the inclination degrees of the two opposite sides with respect to the longitudinal direction may be the same or different; in the case where both opposite sides of the first slot 119 are curved, the degree of curvature of both opposite sides may be the same or different.

In particular, the two opposite sides of the first slot 119 may be symmetrical about a center line of the first slot 119. The two opposite sides of the second slot 129 may be symmetrical about the center line of the second slot 129. Therefore, the slotting is symmetrical, the manufacture is convenient, and the effect of absorbing deformation is better.

Referring to fig. 16, alternatively, the slot width W21 of the first slot 119 is 5mm to 15mm. For example 5mm, 8mm, 10mm, 11.375mm, 13mm, 15mm. In this way, the notch width W21 of the first groove 119 is made to be in a proper range, so that the effect of absorbing the expansion stress in the longitudinal direction of the land region 10 is better. Preferably, the slot width W21 of the first slot 119 is 11.375mm. The tolerance of the slot width W21 of the first slot 119 may be ±0.02mm.

Alternatively, the slot width W22 of the second slot 129 is 5mm-15mm. For example 5mm, 8mm, 10mm, 11.375mm, 13mm, 15mm. In this way, the notch width W22 of the second groove 129 is made to be in a proper range, so that the effect of absorbing the expansion stress in the longitudinal direction of the land area 10 is better. Preferably, the slot width W22 of the second slot 129 is 11.375mm. The tolerance of the slot width W22 of the second slot 129 may be ±0.02mm.

Specifically, in the present embodiment, the notch width W21 of the first slot 119 and the notch width W22 of the second slot 129 are equal. In this way, the two sides of the body 101 in the length direction have similar capability of absorbing the telescopic stress, and the unstable structure caused by too deep one slot and too shallow the other slot is avoided.

It is understood that in other embodiments, the slot width W21 of the first slot 119 and the slot width W22 of the second slot 129 may also be different.

Referring to fig. 15, the first slot 119 may optionally include a first slot edge 1191 and a second slot edge 1192 opposite to each other, where the first slot edge 1191 forms an angle of 10 ° to 40 ° with respect to the length direction of the body 101, and/or the second slot edge 1192 forms an angle of 10 ° to 40 ° with respect to the length direction.

Specifically, the first slot edge 1191 forms an angle of, for example, 10 °, 12 °, 15 °, 20 °, 26 °, 30 °, 36 °, 40 ° with the longitudinal direction of the body 101. In this way, by the inclination of the groove edge, the distance between the two opposite sides of the groove 119 gradually increases towards the direction away from the first welding point 11, and the inclination angle of the groove edge is in a proper range, so that the telescopic stress can be absorbed better. Further, the first slot edge 1191 forms an angle of 20 ° -30 ° with the length direction of the body 101.

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, the difference may be different.

Note that the second slot edge 1192 is similar to the first slot edge 1192, and reference is made to the description of the first slot edge 1191 to avoid redundancy.

Optionally, the second slot 129 includes opposed third and fourth slot sides 1291, 1292, the third slot side 1291 being angled at 10 ° to 40 ° to the length of the body and/or the fourth slot side 1292 being angled at 10 ° to 40 ° to the length.

Note that the description of the two sides of the second slot 129 may refer to the description of the two sides of the first slot 119, and will not be repeated herein to avoid redundancy.

Referring to fig. 15, the first slot 119 may optionally include 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 opposed third and fourth slot sides 1291, 1292, the third and fourth slot sides 1291, 1292 forming a second rounded corner 1293.

In this way, the angle change at the junction of the slot edges is relatively gentle, and the risk of breakage during pivoting of the strap section 10 can be reduced.

Specifically, the radius of the first rounded corners 1193 is 0.5mm-1.5mm. For example 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm. Thus, the radius of the first rounded corner 1193 is in a proper range, so that the first rounded corner 1193 is smoother when connecting the first groove edge 1191 and the second groove edge 1192. Preferably, the radius of the first rounded corners 1193 is 1mm.

Further, a first curve and a second curve may be provided between the first rounded corner 1193 and the first slot edge 1191 and the second slot edge 1192, respectively. In this way, 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 0.5mm-1.5mm. For example 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm. Preferably, the radius of the second rounded corner 1293 is 1mm.

Further, a third curve and a fourth curve may be provided between the second rounded corner 1293 and the third and fourth slot sides 1291 and 1292, respectively. In this way, a smooth transition of the second rounded corner 1293 and the two slot edges is further achieved by the curve.

Referring to fig. 15, optionally, the first slot 119 includes a first bottom point 1194, the second slot 129 includes a second bottom point 1294 adjacent to the first slot 119, and an angle formed by a line connecting the first bottom point 1194 and the second bottom point 1294 and a length direction of the body 101 is 75 ° to 90 °. For example 75 °, 78 °, 80 °, 82 °, 85 °, 89 °, 90 °. In this way, the first bottom point 1194 and the second bottom point 1294 are less misaligned in the width direction, which facilitates better pivoting and thus better absorption of deformation.

Preferably, the 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. In this way, first bottom point 1194 is aligned with second bottom point 1294 in the width direction, minimizing misalignment of first bottom point 1194 with second bottom point 1294 in the width direction, and thus maximizing the effect of absorbing deformation.

It is appreciated that the line connecting the first bottom point 1194 and the second bottom point 1294 is the non-pivot line 1019 described above. Two narrowing tapers 1017 are formed on either side of the non-pivoting line 1019.

Referring to fig. 15, optionally, the first slot 119 includes a first bottom point 1194, the second slot 129 includes a second bottom point 1294 adjacent to the first bottom point 1194, the first solder joint 11 includes a third bottom point 118 adjacent to the first bottom point 1194, and the first bottom point 1194 is spaced from the second bottom point 1294 by a distance greater than the distance from the third bottom point 118 to the adjacent sides of the first bottom point 1194.

In this way, the length of the pivot line 1018 is made smaller than the length of the non-pivot line 1019, so that a gradation portion 1017 is formed between the pivot line 1018 and the non-pivot line 1019, so that in the case where the strap region 10 is subjected to a telescopic stress, the gradation portion 1017 is bent around the pivot line 1018, thereby absorbing the telescopic stress.

It is appreciated that the spacing of first nadir 1194 from second nadir 1294 is the length of non-pivot line 1019. The distance of third bottom point 118 to the adjacent slot edge of first bottom point 1194, i.e., the length of pivot line 1018.

Specifically, since the pitches of both opposite sides of the slit become larger gradually in a direction away from the corresponding solder joint, the gradation portion 1017 near the slit becomes narrower at one end near the corresponding solder joint, so that the pivot line 1018 can be formed.

Referring to fig. 15, 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. In this way, the angle change at the junction of the slot edge and the edge line of the body 101 is gentle, and the risk of breakage during pivoting of the solder strip 10 can be reduced.

Specifically, the radius of the third rounded corner is 0.1mm-1mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm. Preferably, the radius of the third rounded corner is 0.5mm. Specifically, the radius of the fourth round angle is 0.1mm-1mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm. Preferably, the radius of the fourth rounded corner is 0.5mm. Specifically, the radius of the fifth rounded corner is 0.1mm-1mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm. Preferably, the radius of the fifth rounded corner is 0.5mm. Specifically, the radius of the sixth rounded corner is 0.1mm-1mm. For example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm. Preferably, the radius of the sixth rounded corner is 0.5mm. In this way, the radius of each fillet is in a proper range, so that the groove edge is smoother when being connected with the edge line of the body 101.

In this embodiment, the radii of the third rounded, fourth rounded, fifth rounded, and sixth rounded are all the same. Thus, the manufacturing is convenient, and the production efficiency is improved. In other embodiments, the radii of the third, fourth, fifth, and sixth rounded corners may also be partially the same or all different.

Further, curves may be respectively disposed between each rounded corner and the body 101. In this way, a smooth transition of the rounded corners and the edges of the body 101 is further achieved by the curves.

The solder strip prefabricated part is manufactured by adopting the production method of any solder strip prefabricated part.

Since the solder ribbon preform 300 according to the embodiment of the present application is formed by stamping a metal sheet, the solder ribbon preform 300 including the plurality of solder ribbon regions 302 can be cut out a plurality of solder ribbons at a time based on the solder ribbon preform 300, and thus the production efficiency can be improved.

Alternatively, the solder strip preform 300 includes a copper substrate and a tin layer coated on the copper substrate; alternatively, the solder strip preform 300 includes an aluminum substrate and a tin layer coated on the aluminum substrate; or, the solder strip preform 300 is aluminum foil; alternatively, the solder ribbon preform 300 is tin foil.

For further explanation and explanation of this section reference is made to the foregoing, and no further description is given here for the purpose of avoiding redundancy.

Referring to fig. 17, a method for producing a solder strip according to an embodiment of the present application includes:

step S10: manufacturing a solder strip prefabricated part by adopting the production method of the solder strip prefabricated part;

step S20: the solder ribbon preform 302 is cut at the cut-off region 301 to form a plurality of solder ribbons.

The welding strip is manufactured by the production method of the welding strip.

According to the method for producing the welding strip and the welding strip, the welding strip prefabricated member 300 comprising the welding strip areas 302 is formed according to stamping of the metal sheet, so that the welding strips can be cut out at one time based on the welding strip prefabricated member 300, and the production efficiency can be improved.

Specifically, in step S20, the solder ribbon preform 302 may be cut at the cutting region 301 by punching, laser, cutting, or the like.

The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. A method of producing a solder strip preform, comprising:

Paving a metal sheet on a stamping table;

stamping the metal sheet according to a preset pattern to form a welding strip prefabricated member; the welding strip prefabricated member comprises a region to be cut off and a plurality of welding strip regions which are parallel to each other, and two ends of the welding strip regions are connected with the region to be cut off;

the region to be cut is provided with positioning holes, and each positioning hole corresponds to one welding strip region;

the diameter of the positioning hole is 1.2mm-1.3mm;

the region to be truncated is provided with a truncated hole, and each truncated hole is positioned at two ends of the welding strip region;

the to-be-cut-off area is provided with cut-off openings, and each cut-off opening is positioned at two ends of the welding strip area in the length direction and at two ends of the welding strip area in the width direction;

the width of the region to be cut at the cut-off opening is 2mm-3mm;

the width of the welding strip prefabricated part is 175mm-185mm;

the bonding zone comprises:

a body;

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;

2. The method of producing a solder strip preform according to claim 1, wherein the body is provided with a slit, and one end of the slit forms an opening in the body.

3. The method of producing a solder strip preform according to claim 2, wherein each of the first solder joints corresponds to a set of the slits, and as a distance in a length direction from the corresponding first solder joint increases, a distance in a width direction from the corresponding first solder joint increases;

4. A method of producing a solder strip preform according to claim 3, wherein a set of said slits comprises a first slit, a second slit, a third slit, a fourth slit and a fifth slit, said first slit being located in the middle of said set of slits, said second slit and said third slit being located on either side of said first slit, respectively; the fourth gap is positioned at one side of the second gap, which is away from the first gap, and the fifth gap is positioned at one side of the third gap, which is away from the first gap;

The length of a set of said slits satisfies the following relationship:

L1>L2=L3>L4=L5；

the size of the welding zone region satisfies the following relation:

d1 =l2, and/or d1=l3;

0.2<L1:(S1+S2)<1.5；

and/or 0.2< L1 (S3+S4) <1.5;

5. The method of claim 1, wherein a line connecting the first weld and the second weld closest to the first weld is at an angle of 20 ° -60 ° to the length direction of the weld.

6. The method of manufacturing a solder strip preform according to claim 1, wherein a first slot is formed in the body and corresponds to the first solder joint, and a distance between two opposite sides of the first slot becomes gradually larger in a direction away from the first solder joint;

7. The method of claim 6, wherein the first slot includes a first bottom point, the second slot includes a second bottom point adjacent to the first bottom point, the first weld 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 a distance from the third bottom point to an adjacent slot edge of the first bottom point.

8. The method of claim 6, wherein the first slot includes a first bottom point, the second slot includes a second bottom point adjacent to the first slot, and an angle formed between a line connecting the first bottom point and the second bottom point and a length direction of the body is 75 ° -90 °;

And/or the depth of the first slot is 1mm-3.5mm;

and/or the depth of the second slot is 1mm-3.5mm;

and/or the width of the notch of the first groove is 5mm-15mm;

and/or the width of the notch of the second slotting is 5mm-15mm;

9. A solder strip preform produced by the method of any one of claims 1 to 8.

10. The solder strip preform of claim 9, wherein the solder strip preform comprises a copper substrate and a tin layer coated on the copper substrate; or, the solder strip prefabricated part comprises an aluminum base material and a tin layer coated on the aluminum base material; or, the welding strip prefabricated part is aluminum foil; or, the solder strip prefabricated part is tin foil.

11. A solder strip preform manufactured by the method for manufacturing a solder strip preform according to any one of claims 1 to 8, wherein the solder strip preform is sheet-shaped, and the solder strip preform comprises a region to be cut off and a plurality of solder strip regions parallel to each other, and two ends of the plurality of solder strip regions are connected to the region to be cut off.

12. A method of producing a solder strip, comprising:

forming a solder strip preform by the method of any one of claims 1-8;

13. A solder strip produced by the method of claim 12.