CN218769570U - Solder strip piece and battery pack - Google Patents

Abstract

The utility model relates to a photovoltaic technology field specifically provides solder strip spare and battery pack, solder strip spare is suitable for establishing ties a plurality of battery pieces, solder strip spare includes: the first welding band area and the second welding band area are arranged in a spaced and cyclic mode along the extending direction of the welding band piece; a connecting portion connecting the first strap region and the second strap region; the first solder strip area comprises a first solder strip body area and a plurality of solder strip protruding areas arranged at intervals, the solder strip protruding areas are arranged on the surface of the first solder strip body area in a surrounding mode, and the second solder strip area is provided with openings penetrating through the second solder strip area at intervals. The cost of the welding strip piece is low, and the photoelectric conversion efficiency from the cell piece to the cell assembly can be improved.

Description

Solder strip piece and battery pack

Technical Field

The utility model relates to a photovoltaic technology field, concretely relates to solder strip spare and battery pack.

Background

With the frequency of non-renewable energy sources becoming more urgent, solar energy as a new energy source offers new possibilities for energy structures around the globe. And the inexhaustible solar energy is used, so that the worries of insufficient energy sources are solved. Solar cells are important devices for converting light energy into electric energy. The current solar cells comprise various types, and after the preparation of the cell pieces is finished, the cell pieces are usually connected in series and in parallel to form a cell module, so that the large-scale application is realized. Generally, from a battery piece to a battery module, a plurality of battery pieces are connected in series to form a battery string through an interconnection technology, and then the battery strings are connected in parallel to form the battery module through processes such as laying, laminating and the like. One of the series connection is to connect adjacent battery pieces by solder strips.

The solder strip piece that uses at present is the regular circle silk solder strip, it is very easy to lead to solar cell to appear lobe of a leaf and piece in welding battery cluster or lamination process, interval between the yield battery piece for guaranteeing battery pack is great, consequently, cause battery pack unit area cost to increase, and solder strip piece is great to the shading area of battery piece when current battery piece establishes ties, lead to the battery piece to reduce battery pack's photoelectric conversion efficiency, furthermore, when battery pack encapsulates, between battery piece and the encapsulation glued membrane, between battery piece and the solder strip piece, the cohesion between encapsulation glued membrane and the solder strip piece is less, lead to the battery piece to take place to remove easily.

Therefore, it is an urgent technical problem to provide a solder strip to reduce the cost of the solder strip and improve the photoelectric conversion efficiency from the cell to the cell module.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses it is higher to solve the technical problem among the prior art and lie in overcoming the cost of welding the area spare among the prior art, and great to the shading area of battery piece, leads to the battery piece to the defect that battery pack's photoelectric conversion efficiency reduces to a weld area spare and battery pack are provided.

The utility model provides a weld and take spare, weld and take spare to be suitable for and establish ties a plurality of battery pieces, include: the first welding band area and the second welding band area are arranged in a spaced and cyclic mode along the extending direction of the welding band piece; a connecting portion connecting the first strap region and the second strap region; the first solder strip area comprises a first solder strip body area and a plurality of solder strip protruding areas arranged at intervals, the solder strip protruding areas are arranged on the surface of the first solder strip body area in a surrounding mode, and the second solder strip area is provided with openings penetrating through the second solder strip area at intervals.

Optionally, the shape of a cross section of the first solder strip body region in a direction perpendicular to the extending direction of the solder strip piece comprises a circle, and the shape of a cross section of the solder strip protruding region in a direction perpendicular to the extending direction of the solder strip piece comprises a circular ring; the shape of the cross-section of the second solder strap region in a direction perpendicular to the direction of extension of the solder strap piece and not through the opening comprises a rectangle.

Optionally, the width direction of the solder strip protruding region is perpendicular to the extending direction of the first solder strip body region.

Optionally, the thickness of the connecting portion gradually decreases from the first solder strip region to the second solder strip region; and/or the width of the connecting part gradually increases from the first welding strip area to the second welding strip area.

Optionally, the shapes of the two side surfaces of the connecting portion arranged in the thickness direction are both inclined trapezoids.

Optionally, the maximum width of the first solder ribbon body region is less than the width of the second solder ribbon region.

Optionally, the maximum width of the solder ribbon protruding area is 0.01mm to 0.03mm greater than the maximum width of the first solder ribbon body area.

Optionally, the maximum width of the first solder ribbon body region is 0.30mm to 0.40mm less than the width of the second solder ribbon region.

Optionally, the maximum width of the first solder strip body region is 0.20mm to 0.26mm.

Optionally, the maximum width of the solder strip protruding area is 0.25mm-0.30mm.

Optionally, the width of the second solder strip region is 0.65mm to 0.75mm.

Optionally, the thickness of the second solder ribbon region is less than the maximum thickness of the first solder ribbon body region.

Optionally, the thickness of the second solder ribbon region is 0.10mm to 0.15mm less than the maximum thickness of the first solder ribbon body region.

Optionally, the diameter of the opening is 0.50mm-0.60mm; the number of the openings is a plurality, and the distance between every two adjacent openings is 15mm-18mm.

Optionally, the size of the solder strip protruding area along the length direction of the first solder strip body area is 0.4mm-0.8mm; the number of the solder strip protruding areas is a plurality, and the distance between the adjacent solder strip protruding areas is 15mm-18mm.

Optionally, the maximum thickness of the first solder strip body region is 0.20mm-0.26mm; the second solder strap region has a thickness of 0.13mm to 0.17mm.

Optionally, the shortest perpendicular distance between the surface of the first solder strap region and the surface of the second solder strap region is from 0.08mm to 0.12mm.

The utility model also provides a battery pack, include: a plurality of battery pieces; the welding strip pieces are connected with the adjacent battery pieces in series, the welding strip protruding area is welded with the surfaces of the battery pieces, the first welding strip area is welded with one side of the light receiving surface of the battery pieces, and the second welding strip area is welded with one side of the backlight surface of the battery pieces.

The utility model discloses technical scheme has following advantage:

the utility model discloses on the one hand, the first solder strip district that the technical scheme provided includes first solder strip body region and the solder strip bulge area that a plurality of intervals set up, the solder strip bulge area encircles the surface that sets up in first solder strip body region, the solder strip bulge area is used for making as effective welding area solder strip bulge area and the sensitive surface welding of battery piece together, guarantees not to influence welding quality, makes like this solder strip spare save material, reduces the cost of solder strip spare, also reduces the solder strip spare to the shading area on battery piece surface, is favorable to increasing the photoelectric conversion efficiency of battery piece; on the other hand, the second welding strip area is provided with an opening penetrating through the second welding strip area, so that the material of a welding strip piece is saved, and the cost of the welding strip piece is reduced. Therefore, the cost of the solder strip piece is low, and the photoelectric conversion efficiency of the battery piece to the battery assembly can be improved.

Further, the shape of the cross section of the first solder strip body area in the direction perpendicular to the extending direction of the solder strip piece comprises a circle, and the shape of the cross section of the solder strip protruding area in the direction perpendicular to the extending direction of the solder strip piece comprises a circular ring; the shape of the cross section is a circular first welding strip body area, so that the shading area of the first welding strip body area to the light receiving face of the battery piece can be reduced, the shape of the cross section is a circular welding strip protruding area, so that the shading area of the welding strip protruding area to the light receiving face of the battery piece can be reduced, meanwhile, when the shape of the cross section is a circular first welding strip body area and a circular welding strip protruding area, the circular curved surface can reflect light to the light receiving face of the battery piece, the absorption of the battery piece to light rays is increased, and the photoelectric conversion efficiency of the battery piece can be increased. The shape of the cross-section of the second solder strap region in a direction perpendicular to the direction of extension of the solder strap piece and not through the opening comprises a rectangle. The second welding strip area with the rectangular cross section is in surface contact with the backlight surface of the battery piece, so that the stress area is large, and the risk of the battery piece cracking can be reduced due to the fact that the second welding strip area with the rectangular cross section is formed.

Further, the thickness of the connecting part is gradually reduced from the first welding strip area to the second welding strip area; and/or the width of the connecting part is gradually increased from the first welding belt area to the second welding belt area, so that the transition of the thickness and the width between the first welding belt area and the second welding belt area is realized, the battery plates can be prevented from being bent when the battery plates are connected in series, the probability of the battery plates being cracked and chipped in the process of connecting the battery plates in series is reduced, and the probability of the battery plates being cracked and chipped in the later packaging process is also reduced.

The utility model provides a battery pack, it is adjacent to weld area series connection the battery piece, weld the area bulge with the surface welding of battery piece is in the same place, weld area and battery piece's sensitive surface one side welding in first solder strip area, second solder strip area and battery piece's backlight surface one side welding, the solder strip bulge encircles the setting and is in the surface in first solder strip body district, the solder strip bulge guarantees the better combination of solder strip area and battery piece, increases the welding pulling force, first solder strip body district reduces the shading area of solder strip piece to the battery piece is favorable to increasing the photoelectric conversion efficiency of battery piece, and then is favorable to improving battery pack's power, secondly, second solder strip area has the run through the opening in second solder strip area, it is right consequently when battery pack encapsulates, the encapsulation glued membrane can get into in the opening, improve between battery piece and the encapsulation glued membrane, the battery piece with between the solder strip piece, encapsulate with the cohesion between the solder strip area is avoided the battery piece takes place to remove, consequently, and the battery pack's power is right the high battery pack's power is right.

Drawings

To illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a top view of a solder strip piece according to an embodiment of the present invention;

fig. 2 is a side view of a solder ribbon piece of the present invention taken along the cutting line X in fig. 1;

fig. 3 is a cross-sectional view of a solder ribbon piece taken along a cutting line Y in fig. 1 according to an embodiment of the present invention;

fig. 4 is a front view of a solder ribbon element according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a portion of a battery assembly according to an embodiment of the present invention.

Description of reference numerals:

d1-a first strap region; d2-a second strap region; a J-junction; b-a first solder ribbon body region; t-solder strip overhang region; k11-maximum width of the first solder ribbon body region; k12-maximum width of the solder strip overhang; k-opening; l21-diameter; l22-spacing between adjacent openings; l11-the dimension of the solder strip overhang T along the length of the first solder strip body region; l12-distance between adjacent solder strip raised areas; h1 — maximum thickness of first strap region; h 2-thickness of the second strap region; h 3-vertical distance; 100-battery piece.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a solder strip adapted to connect several battery pieces in series, which includes, with reference to fig. 1:

a first welding band region D1 and a second welding band region D2 which are arranged at intervals in a circulating manner along the extending direction of the welding band piece;

a joint portion J that connects the first strap region D1 and the second strap region D2;

the first solder ribbon area D1 includes a plurality of first solder ribbon body areas B and a plurality of spaced solder ribbon protruding areas T surrounding a surface of the first solder ribbon body areas B, and the second solder ribbon area D2 has openings K penetrating the second solder ribbon area D2.

In the solder strip piece provided by the embodiment, on one hand, the first solder strip region D1 includes a first solder strip body region B and a plurality of solder strip protruding regions T arranged at intervals, the solder strip protruding regions T are arranged around the surface of the first solder strip body region B, and the solder strip protruding regions T are used as effective welding regions to weld the solder strip protruding regions T and the light receiving surface of the cell together, so that the welding quality is not affected, the solder strip piece saves materials, the cost of the solder strip piece is reduced, the light shielding area of the solder strip piece on the surface of the cell is also reduced, and the photoelectric conversion efficiency of the cell is increased; on the other hand, the second welding strip region D2 has an opening K penetrating through the second welding strip region D2, which is beneficial to saving welding strip material and reducing the cost of the welding strip. Therefore, the cost of the welding strip piece is low, and the photoelectric conversion efficiency of the cell piece can be improved.

In one embodiment, referring to fig. 2, the shape of the cross section of the first solder ribbon body area B in the direction perpendicular to the extension direction of the solder ribbon piece comprises a circle, and the shape of the cross section of the solder ribbon protrusion area T in the direction perpendicular to the extension direction of the solder ribbon piece comprises a circular ring; the first welding strip body area B with the circular cross section is beneficial to reducing the shading area of the first welding strip body area B to the light receiving surface of the battery piece, the welding strip protruding area T with the circular cross section is beneficial to reducing the shading area of the welding strip protruding area T to the light receiving surface of the battery piece, and meanwhile, when light irradiates the first welding strip body area B with the circular cross section and the welding strip protruding area T with the circular cross section, the circular curved surface can reflect the light to the light receiving surface of the battery piece, so that the absorption of the battery piece to the light is increased, and the photoelectric conversion efficiency of the battery piece is increased.

In one embodiment, with reference to fig. 3, the shape of the cross section of the second solder strap region D2 in a direction perpendicular to the extension of the solder strap piece and not through the opening K comprises a rectangle. The second welding strip area D2 with the rectangular cross section is in surface contact with the backlight surface of the battery piece, so that the stress area is large, and the risk of the battery piece cracking can be reduced due to the fact that the second welding strip area with the rectangular cross section is formed.

In one embodiment, the width direction of the solder ribbon protrusion area T is perpendicular to the extending direction of the first solder ribbon body area B.

In one embodiment, with continued reference to FIG. 1, the diameter L21 of the opening K is 0.50mm-0.60mm, such as 0.53mm, 0.55mm, or 0.58mm; if the diameter of the opening is less than 0.50mm, the material of the solder strip piece is saved to a lesser extent, and the cost of the solder strip piece is reduced to a lesser extent, and if the diameter of the opening is greater than 0.60mm, the continuity of the second solder strip area may be impaired.

In one embodiment, with continued reference to fig. 1, the number of openings K is several, and the spacing L22 between adjacent openings is 15mm to 18mm, such as 15.5mm, 16.5mm, or 17.5mm; if the spacing between the adjacent openings is smaller than 15mm, the openings of the second welding belt area are too large, so that the better combination of the second welding belt area and the battery piece is ensured to be smaller, and if the spacing between the adjacent openings is larger than 18mm, the openings of the second welding belt area are too small, so that the material of the welding belt piece is saved to a smaller extent, and the cost of the welding belt piece is reduced to a smaller extent.

In one embodiment, with continued reference to fig. 1, the dimension L11 of the solder ribbon lead out T along the length of the first solder ribbon body area B is 0.4mm-0.8mm; e.g., 0.5mm, 0.6mm; if the size of the solder strip protruding area along the length direction of the first solder strip body area is less than 0.4mm, the better combination degree of the solder strip protruding area and the battery piece is ensured to be smaller; if the size of the solder strip protruding region along the length direction of the first solder strip body region is larger than 0.8mm, the degree of saving the material of the solder strip piece is smaller, the degree of reducing the cost of the solder strip piece is smaller, the degree of reducing the shading area of the solder strip piece on the surface of the battery piece is smaller, and the degree of increasing the photoelectric conversion efficiency of the battery piece is smaller.

In one embodiment, with continued reference to fig. 1, the number of the solder ribbon projections T is several, and the distance L12 between adjacent solder ribbon projections T is 15mm to 18mm, such as 16mm, 17mm; if the distance between the adjacent solder strip protruding areas is smaller than 15mm, the degree of saving materials of the solder strip piece is smaller, the degree of reducing the cost of the solder strip piece is smaller, the degree of reducing the shading area of the solder strip piece on the surface of the cell piece is smaller, and the degree of increasing the photoelectric conversion efficiency of the cell piece is smaller; if the distance between the adjacent solder strip convex areas is larger than 18mm, the better combination degree of the solder strip convex areas and the battery piece is ensured to be smaller.

In one embodiment, with continued reference to fig. 1, the maximum width K11 of the first solder strip body region B is smaller than the width K2 of the second solder strip region D2, which is beneficial to reducing the light shielding area of the solder strip element on the surface of the cell, and is beneficial to increasing the photoelectric conversion efficiency of the cell

In one embodiment, the maximum width K11 of the first solder ribbon body region B is 0.30mm to 0.40mm, e.g., 0.32mm, 0.36mm, less than the width K2 of the second solder ribbon region D2.

In one embodiment, the maximum width K12 of the solder ribbon lead out area T is 0.01mm to 0.03mm, such as 0.02mm, greater than the maximum width K11 of the first solder ribbon body area B. Therefore, the bonding force between the welding strip protruding area T and the battery piece is improved.

In one embodiment, the maximum width K11 of the first solder ribbon body area B is 0.20mm to 0.26mm, such as 0.22mm, 0.23mm.

In one embodiment, the maximum width K12 of the solder ribbon lead out area T is 0.25mm to 0.30mm, such as 0.26mm, 0.28mm.

In one embodiment, the width K2 of the second solder strap region D2 is 0.65mm to 0.75mm, such as 0.68mm, 0.70mm.

In one embodiment, referring to fig. 4, the thickness h2 of the second solder strip region D2 is smaller than the maximum thickness h1 of the first solder strip body region B, which is beneficial to reducing the distance between the back-side encapsulation glass and the battery piece when the battery assembly is encapsulated, and is beneficial to reducing the usage amount of the back-side encapsulation adhesive film, thereby being beneficial to saving the encapsulation cost.

In one embodiment, the thickness h2 of the second solder ribbon region D2 is 0.10mm to 0.15mm, such as 0.12mm, 0.13mm, or 0.14mm, less than the maximum thickness h1 of the first solder ribbon body region B.

In one embodiment, the maximum thickness h1 of the first solder strip body area B is 0.20mm-0.26mm, such as 0.22mm, 0.23mm or 0.24mm.

In one embodiment, the thickness h2 of the second solder strap region D2 is 0.13mm-0.17mm, such as 0.15mm, 0.16mm.

In one embodiment, with continued reference to FIG. 1, the thickness of the joint J gradually decreases from the first strap region D1 to the second strap region D2; and/or the width of the connecting part J gradually increases from the first welding band region D1 to the second welding band region D2. The shapes of the surfaces of the two sides of the connecting part J, which are arranged in the thickness direction of the connecting part J, are inclined trapezoids. Therefore, the transition between the first welding band region D1 and the second welding band region D2 in thickness and width is realized, the battery plates can be prevented from being bent when being connected in series, the probability of the battery plates being cracked and chipped in the process of connecting the battery plates in series is reduced, and the probability of the battery plates being cracked and chipped in the later packaging process is also reduced.

In one embodiment, the thickness of the joint J decreases linearly in a direction from the first strap region D1 to the second strap region D2; and/or the width of the connecting part J increases linearly from the first welding belt area D1 to the second welding belt area D2.

In one embodiment, with continued reference to FIG. 4, the shortest vertical distance h3 between the surface of the first solder strap region D1 and the surface of the second solder strap region D2 is 0.08mm-0.12mm, such as 0.09mm, 0.10mm, or 0.11mm; if the shortest vertical distance between the surface of the first solder ribbon region D1 and the surface of the second solder ribbon region D2 is greater than 0.12mm, the battery pieces are easily crushed during lamination due to an excessive height difference between adjacent battery pieces during the process of packaging the battery assembly.

Example 2

The present embodiment provides a battery assembly, referring to fig. 5, including:

a plurality of battery cells 100;

the solder strip M according to the previous embodiment is configured to connect adjacent battery pieces in series, the solder strip protruding area is welded to the surfaces of the battery pieces, the first solder strip area D1 is welded to the light receiving surface side of the battery piece, and the second solder strip area D2 is welded to the backlight surface side of the battery piece.

In the battery pack provided by this embodiment, the solder strip pieces are connected in series with the adjacent battery pieces, the solder strip protruding area is welded with the surfaces of the battery pieces, the first solder strip area is welded with one side of the light receiving surface of the battery pieces, the second solder strip area on the side of the opening is welded with one side of the backlight surface of the battery pieces, the solder strip protruding area is arranged on the surface of the first solder strip body area in a surrounding manner, the solder strip protruding area ensures that the solder strip pieces are better combined with the battery pieces, welding tension is increased, the first solder strip body area reduces the shading area of the solder strip pieces to the battery pieces, photoelectric conversion efficiency of the battery pieces is increased, and further the power of the battery pack is improved.

In one embodiment, a shape of a cross section of the first solder ribbon body region in a direction perpendicular to an extending direction of the solder ribbon piece includes a circular shape, and a shape of a cross section of the solder ribbon protrusion region in the direction perpendicular to the extending direction of the solder ribbon piece includes a circular ring shape; the circular-shaped cross section of the welding strip protruding area is beneficial to reducing the shading area of the welding strip protruding area to the light receiving surface of the battery piece, the circular-shaped cross section of the first welding strip body area is beneficial to reducing the shading area of the first welding strip body area to the light receiving surface of the battery piece, and meanwhile, when light irradiates the circular-shaped welding strip protruding area and the circular-shaped first welding strip body area, the circular curved surface can reflect the light to the light receiving surface of the battery piece, so that the absorption of the battery piece to the light is increased, the photoelectric conversion efficiency of the battery piece is increased, and the power of the battery assembly is improved.

In one embodiment, the shape of the cross section of the second welding band region, which is perpendicular to the extending direction of the welding band piece and does not pass through the opening, comprises a rectangle, the second welding band region with the rectangular cross section is in surface contact with the back light surface of the battery piece, the second welding band region can be welded with the back light surface of the battery piece more firmly, the stress area of the second welding band region is large, and the risk of cracking and chipping of the battery piece can be reduced when the battery assembly is packaged.

In one embodiment, the solder strip protruding region is welded with the solder points on the grid lines of the light receiving surface of the battery piece, and the second solder strip region on the side of the opening is welded with the solder points on the grid lines of the backlight surface of the battery piece.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims (18)

1. A solder strip adapted to connect a plurality of battery pieces in series, comprising:

the first welding band area and the second welding band area are arranged in a spaced and cyclic mode along the extending direction of the welding band piece;

a connecting portion connecting the first strap region and the second strap region;

the first solder strip area comprises a first solder strip body area and a plurality of solder strip protruding areas arranged at intervals, the solder strip protruding areas are arranged on the surface of the first solder strip body area in a surrounding mode, and the second solder strip area is provided with openings penetrating through the second solder strip area at intervals.

2. The solder strip article of claim 1, wherein a cross-sectional shape of the first solder strip body region in a direction perpendicular to a direction of elongation of the solder strip article comprises a circular shape, and a cross-sectional shape of the solder strip protruding region in a direction perpendicular to the direction of elongation of the solder strip article comprises a circular shape;

the shape of the cross-section of the second solder strap region in a direction perpendicular to the direction of extension of the solder strap piece and not through the opening comprises a rectangle.

3. The solder strip article of claim 1, wherein a width direction of the solder strip overhang region is perpendicular to an extension direction of the first solder strip body region.

4. A solder strip article as recited in claim 1, wherein the thickness of the joint portion decreases progressively in a direction from the first solder strip region to the second solder strip region; and/or the width of the connecting part gradually increases from the first welding belt area to the second welding belt area.

5. The solder ribbon according to claim 4, wherein both side surfaces of the connecting portion arranged in the thickness direction thereof are each in the shape of an inclined trapezoid.

6. The solder strip piece of any one of claims 1-5, wherein the maximum width of the first solder strip body region is less than the width of the second solder strip region.

7. The ribbon piece of any of claims 1-5, wherein a maximum width of the ribbon projection area is 0.01mm-0.03mm greater than a maximum width of the first ribbon body area.

8. A solder strip article according to claim 6, wherein the maximum width of the first solder strip body region is 0.30-0.40 mm smaller than the width of the second solder strip region.

9. The ribbon bonding of claim 8, wherein the first ribbon body region has a maximum width of 0.20mm to 0.26mm.

10. The solder ribbon element of claim 8, wherein the maximum width of the solder ribbon overhang region is from 0.25mm to 0.30mm.

11. A solder strip article according to claim 6 wherein the width of the second solder strip region is 0.65mm to 0.75mm.

12. The solder strip piece of any one of claims 1 to 5, wherein the thickness of the second solder strip region is less than the maximum thickness of the first solder strip body region.

13. The solder strip article of claim 12, wherein the thickness of the second solder strip region is 0.10mm-0.15mm less than the maximum thickness of the first solder strip body region.

14. The strap member of any one of claims 1 to 5 wherein the opening has a diameter of 0.50mm to 0.60mm;

the number of the openings is a plurality, and the distance between every two adjacent openings is 15mm-18mm.

15. The ribbon piece of any one of claims 1-5, wherein the ribbon projection area has a dimension along the length of the first ribbon body area of 0.4mm to 0.8mm;

the number of the solder strip protruding areas is a plurality, and the distance between the adjacent solder strip protruding areas is 15mm-18mm.

16. The solder strip piece of any one of claims 1 to 5, wherein the maximum thickness of the first solder strip body region is 0.20mm to 0.26mm;

the thickness of the second solder strap region is 0.13mm-0.17mm.

17. The solder strip piece of any one of claims 1 to 5 wherein the shortest perpendicular distance between the surface of the first solder strip region and the surface of the second solder strip region is 0.08mm to 0.12mm.

18. A battery assembly, comprising:

a plurality of battery pieces;

the solder strip of any one of claims 1 to 17, connecting adjacent ones of the cell pieces in series, the solder strip protruding region being soldered to the surface of the cell piece, the first solder strip region being soldered to the light receiving surface side of the cell piece, and the second solder strip region being soldered to the back surface side of the cell piece.

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