CN219696467U - Solder strip and battery assembly - Google Patents
Solder strip and battery assembly Download PDFInfo
- Publication number
- CN219696467U CN219696467U CN202320385585.8U CN202320385585U CN219696467U CN 219696467 U CN219696467 U CN 219696467U CN 202320385585 U CN202320385585 U CN 202320385585U CN 219696467 U CN219696467 U CN 219696467U
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- Prior art keywords
- welding
- solder
- strip
- cross
- sectional area
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- 229910000679 solder Inorganic materials 0.000 title claims abstract description 92
- 238000003466 welding Methods 0.000 claims abstract description 117
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000005476 soldering Methods 0.000 claims abstract description 16
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000969 carrier Substances 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a welding strip, which is provided with a plurality of welding points distributed at intervals along the extending direction of the welding strip, wherein the welding strip is used for being welded with a battery piece at each welding point, the welding strip comprises a base material and a welding layer arranged on the surface of the base material, the base material comprises a plurality of welding parts and a plurality of connecting parts, the positions of the welding parts are in one-to-one correspondence with the welding points, and two adjacent welding parts are electrically connected through the connecting parts; the thickness of the solder layer on the soldering portion is greater than the thickness of the solder layer on the connecting portion, and the average cross-sectional area of the soldering portion is smaller than the average cross-sectional area of the connecting portion. In the embodiment of the utility model, the average cross-sectional area of the welding part of the base material is smaller than that of the connecting part, so that the quantity of the welding flux is reduced, and meanwhile, the connecting part with the cross-sectional area larger than that of the welding part is utilized to ensure that carriers pass through quickly, thereby reducing the manufacturing cost of the battery assembly and improving the power gain of the battery assembly. The utility model also provides a battery assembly.
Description
Technical Field
The utility model relates to the field of photovoltaics, in particular to a welding strip and a battery assembly comprising the welding strip.
Background
As the photovoltaic industry grows and matures, more and more practitioners are beginning to pay attention to schemes from manufacturing to material cost reduction and efficiency improvement. The tin-coated solder strip is used as a key auxiliary material for determining electrical connection of the photovoltaic module, and more eyes are condensed.
In the downstream production process of the photovoltaic module, the welding of the battery piece is an extremely critical process step, and the welding of the battery piece means that a welding strip (an interconnection strip or a round wire made of tin coated on the surface of a copper base material) and the surface of the battery piece form good and compact connection so as to ensure that the surface of the subsequent battery piece can collect current more efficiently.
However, the existing round wire or interconnection strip structure often causes larger tin material waste, and how to provide a welding strip capable of reducing the photovoltaic production cost while guaranteeing the welding quality is a technical problem to be solved in the industry.
Disclosure of Invention
The present utility model is directed to a welding ribbon capable of reducing photovoltaic production costs while ensuring welding quality, and a battery pack including the same.
As one aspect of the present utility model, there is provided a solder strip having a plurality of soldering points spaced apart along an extending direction of the solder strip, the solder strip being for soldering with a battery cell at each of the soldering points, the solder strip comprising a base material and a solder layer provided on a surface of the base material, the base material comprising a plurality of soldering portions and a plurality of connecting portions, the plurality of soldering portions being located in one-to-one correspondence with the plurality of soldering points, adjacent two of the soldering portions being electrically connected by the connecting portions; the thickness of the solder layer on the soldering portion is greater than the thickness of the solder layer on the connecting portion, and the average cross-sectional area of the soldering portion is smaller than the average cross-sectional area of the connecting portion.
Optionally, the welding part is in arc transition connection with the connecting part.
Alternatively, the cross-sectional area of the welded portion is gradually reduced from the middle of the welded portion toward the direction of the connecting portion adjacent to both sides.
Alternatively, the cross-sectional area of the connecting portion is gradually reduced from the middle of the connecting portion to the direction of the welding portion adjacent to both sides.
Optionally, the cross-sectional shape of the welding part and the connecting part is circular.
Alternatively, the cross-sectional shapes of the welding part and the connecting part are rectangular, and the lengths of the welding part and the rectangular long sides of the cross-section of the connecting part are consistent, and the solder layer is formed on the surface of the welding part corresponding to the rectangular long sides of the cross-section of the connecting part.
Optionally, the material of the substrate includes copper.
Optionally, the material of the substrate is copper.
Optionally, the material of the solder layer includes tin.
Optionally, the solder layer is made of tin.
Optionally, the solder layer has a thickness on the soldering portion of 30 μm to 45 μm.
Optionally, the solder layer has a thickness on the connection portion of 10 μm to 25 μm.
As a second aspect of the present utility model, there is provided a battery assembly comprising the above-described solder strip and a plurality of battery pieces, wherein a plurality of the solder points of the solder strip are sequentially soldered to the plurality of battery pieces, one of the two adjacent solder points is soldered to the front surface of the corresponding battery piece, and the other is soldered to the back surface of the corresponding battery piece.
In the prior art, the substrate and tin layer of the solder strip both have a uniform diameter or thickness, and the tin layer in the extension between the two battery pieces creates a significant amount of waste. In the embodiment of the utility model, the base material of the welding strip is provided with a plurality of welding parts at the positions corresponding to the welding points, the welding parts are connected through the connecting parts, the thickness of the solder layer on the welding parts is larger than that of the solder layer on the connecting parts, and the average cross-sectional area of the welding parts is smaller than that of the connecting parts, so that the connecting parts with the cross-sectional area larger than that of the welding parts are utilized to ensure that current carriers pass quickly while the amount of the solder which is not used for welding between the welding points is reduced, the series resistance between the battery pieces is reduced, the overall resistance of the assembly is further reduced, and the power gain of the battery assembly is improved while the manufacturing cost of the battery assembly is reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain, without limitation, the utility model. In the drawings:
FIG. 1 is a schematic cross-sectional view of a solder strip provided by an embodiment of the present utility model;
fig. 2 is a schematic structural view of a battery assembly according to an embodiment of the present utility model.
Reference numerals illustrate:
substrate 100
Welded portion 110
Connection portion 120
Solder layer 200
Detailed Description
The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
In the prior art, round wires or interconnect strips are typically fabricated with both a copper substrate and a tin layer having a uniform diameter or thickness, i.e., the finished product is a regular shape. However, the welding place between the welding strip and the battery piece main grid only needs a certain amount of tin, and the extending part between the two battery pieces does not need to be welded, and no requirement is made on a tin layer, so that the tin layer between welding points (namely the tin layer between the battery pieces does not need to be welded) in the prior art has no function of improving the power gain in use, and a large amount of tin material is wasted.
To solve the above-mentioned technical problem, as one aspect of the present utility model, there is provided a solder ribbon, as shown in fig. 1, having a plurality of solder sites a spaced apart along an extending direction of the solder ribbon, and the solder ribbon is used for solder connection with a battery cell at each of the solder sites a. The solder strip comprises a substrate 100 and a solder layer 200 arranged on the surface of the substrate 100, the substrate 100 comprises a plurality of welding parts 110 and a plurality of connecting parts 120, the positions of the plurality of welding parts 110 are in one-to-one correspondence with a plurality of welding points a, and two adjacent welding parts 110 are electrically connected through the connecting parts 120; the thickness of the solder layer 200 on the solder portion 110 is greater than the thickness of the solder layer 200 on the connection portion 120, and the average cross-sectional area of the solder portion 110 (i.e., the average value of the cross-sectional area of the solder portion 110 along the direction perpendicular to the direction of extension of the solder strip) is smaller than the average cross-sectional area of the connection portion 120 (i.e., the average value of the cross-sectional area of the connection portion 120 along the direction perpendicular to the direction of extension of the solder strip).
In the prior art, the substrate 100 of the solder strip and the tin layer both have a uniform diameter or thickness, and the tin layer in the extension between the two battery pieces creates a great deal of waste. In the present utility model, the substrate 100 of the solder strip has a plurality of solder portions 110 at positions corresponding to the respective solder points a, the solder portions 110 are connected by the connection portions 120, and the thickness of the solder layer 200 on the solder portions 110 is greater than the thickness of the solder layer 200 on the connection portions 120, and the average cross-sectional area of the solder portions 110 is smaller than that of the connection portions 120, so that the connection portions 120 having a cross-sectional area greater than that of the solder portions 110 are used to ensure rapid passage of carriers while reducing the amount of solder not used for soldering between the solder points a (i.e., the amount of solder coated on the connection portions 120), thereby reducing the series resistance between the battery cells, further reducing the overall resistance of the assembly, and improving the power gain of the battery assembly while reducing the manufacturing cost of the battery assembly.
In order to improve the structural strength of the solder strip, as a preferred embodiment of the present utility model, as shown in fig. 1, the solder portion 110 and the connection portion 120 are connected in a circular arc transition.
In the embodiment of the utility model, the welding part 110 and the connecting part 120 are connected in an arc transition manner, so that the phenomenon of stress concentration at the joint of the welding part 110 and the connecting part 120 due to the sharp groove structure is avoided, the structural strength of the welding strip can be effectively improved, the welding strip is prevented from being disconnected when being subjected to tensile force, and the safety of the battery assembly is improved.
To further secure the welding quality between the welding strip and the battery cell, as a preferred embodiment of the present utility model, as shown in fig. 1, the cross-sectional area of the welding part 110 is gradually reduced from the middle of the welding part 110 to the adjacent connecting parts 120 on both sides.
In the embodiment of the utility model, the middle of the welding part 110 is thick and the two ends are thin, so that thicker solder can be attached to the two ends of the welding part 110, and when the welding part 110 is welded with a battery piece, the solder at the connection part between the two ends of the welding part 110 and the connection part 120 can be melted and flow to the welding point a, thereby further ensuring the welding quality between a welding strip and the battery piece and improving the product yield of the battery assembly.
To further secure the welding quality between the welding strip and the battery, as a preferred embodiment of the present utility model, as shown in fig. 1, the cross-sectional area of the connection part 120 is gradually reduced from the middle of the connection part 120 to the adjacent welding parts 110 on both sides.
In the embodiment of the utility model, the middle of the connecting part 120 is thick and the two ends are thin, so that thicker solder can be attached to the two ends of the connecting part 120, and when the welding part 110 is welded with the battery piece, the solder at the connection part between the two ends of the welding part 110 and the connecting part 120 can be melted and flow to the welding point a, thereby further ensuring the welding quality between the welding strip and the battery piece and improving the product yield of the battery assembly.
As an alternative embodiment of the present utility model, the cross-sectional shapes of the welding part 110 and the connecting part 120 are circular.
In the embodiment of the present utility model, the cross sections of the welding portion 110 and the connecting portion 120 are circular, that is, the use mode of the welding strip corresponds to that of the circular wire welding strip in the prior art, and the cross sections of the welding strip are all circular.
In the embodiment of the present utility model, the cross-sectional area of the welding portion 110 is gradually increased in a direction away from the adjacent connecting portion 120, that is, corresponds to a case where the diameter of the welding portion 110 is gradually increased in a direction away from the adjacent connecting portion 120.
In the embodiment of the present utility model, the cross-sectional area of the connecting portion 120 is gradually increased in a direction away from the adjacent welding portion 110, that is, corresponds to a case where the diameter of the connecting portion 120 is gradually increased in a direction away from the adjacent welding portion 110.
As an alternative embodiment of the present utility model, the cross-sectional shapes of the welding part 110 and the connection part 120 are rectangular, and the length of the welding part 110 coincides with the length of the rectangular long side of the cross-section of the connection part 120, and the solder layer 200 is formed on the surface of the welding part 110 corresponding to the rectangular long side of the cross-section of the connection part 120.
In the embodiment of the present utility model, the cross-sectional shapes of the welding portion 110 and the connecting portion 120 are rectangular, that is, the welding strip is used in a manner corresponding to the interconnection strip in the prior art, and the cross-section of each part of the welding strip is rectangular.
In the embodiment of the present utility model, the cross-sectional area of the welding portion 110 is gradually increased in a direction away from the adjacent connecting portion 120, that is, the length of the short side of the rectangle corresponding to the cross-section of the welding portion 110 is gradually increased in a direction away from the adjacent connecting portion 120.
In the embodiment of the present utility model, the cross-sectional area of the connecting portion 120 is gradually increased in a direction away from the adjacent welding portion 110, that is, the length of the short side of the rectangle corresponding to the cross-section of the connecting portion 120 is gradually increased in a direction away from the adjacent welding portion 110.
As an alternative embodiment of the present utility model, the material of the substrate 100 includes copper, for example, an alloy including copper element.
As an alternative embodiment of the present utility model, the substrate 100 is made of copper.
As an alternative embodiment of the present utility model, the material of the solder layer 200 includes tin, for example, may be an alloy including tin.
As an alternative embodiment of the present utility model, the solder layer 200 is made of tin.
As an alternative embodiment of the present utility model, the solder layer 200 has a thickness of 30 μm to 45 μm on the soldering portion 110.
As an alternative embodiment of the present utility model, the solder layer 200 has a thickness of 10 μm to 25 μm on the connection portion 120.
As a second aspect of the present utility model, as shown in fig. 2, there is provided a battery assembly, which includes a solder strip 10 and a plurality of battery pieces 20 provided in an embodiment of the present utility model, a plurality of welding points a of the solder strip 10 are sequentially welded to the plurality of battery pieces 20, one of two adjacent welding points a is welded to a front surface of a corresponding battery piece 20, and the other is welded to a back surface of the corresponding battery piece 20.
In the prior art, the substrate 100 of the solder strip and the tin layer both have a uniform diameter or thickness, and the tin layer in the extension between the two battery pieces creates a great deal of waste. In the battery assembly provided by the utility model, the base material 100 of the welding strip is provided with a plurality of welding parts 110 at the positions corresponding to the welding points a, the welding parts 110 are connected through the connecting parts 120, the thickness of the welding material layer 200 on the welding parts 110 is larger than that of the welding material layer 200 on the connecting parts 120, and the average cross-sectional area of the welding parts 110 is smaller than that of the connecting parts 120, so that the quantity of welding materials which are not used for welding between the welding points a (namely the quantity of welding materials coated on the connecting parts 120) is reduced, and meanwhile, the connecting parts 120 with the cross-sectional area larger than that of the welding parts 110 are utilized to ensure that current carriers pass quickly, so that the series resistance among battery pieces is reduced, the overall resistance of the assembly is further reduced, and the power gain of the battery assembly is improved while the manufacturing cost of the battery assembly is reduced.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (10)
1. The welding strip is provided with a plurality of welding points which are distributed at intervals along the extending direction of the welding strip, and the welding strip is used for being welded with a battery piece at each welding point, and is characterized by comprising a base material and a solder layer arranged on the surface of the base material, wherein the base material comprises a plurality of welding parts and a plurality of connecting parts, the positions of the plurality of welding parts are in one-to-one correspondence with the plurality of welding points, and two adjacent welding parts are electrically connected through the connecting parts; the thickness of the solder layer on the soldering portion is greater than the thickness of the solder layer on the connecting portion, and the average cross-sectional area of the soldering portion is smaller than the average cross-sectional area of the connecting portion.
2. The solder strip of claim 1, wherein the solder portion is in a circular arc transition with the connecting portion.
3. The solder strip of claim 1, wherein the cross-sectional area of the solder portion decreases gradually from the middle of the solder portion toward the two adjacent connecting portions on both sides.
4. The solder strip of claim 1, wherein the cross-sectional area of the connecting portion decreases gradually from the middle of the connecting portion to the directions of the adjacent welding portions on both sides.
5. The solder strip according to any of claims 1 to 4, wherein the cross-sectional shape of the solder portion and the connecting portion is circular.
6. The solder strip according to any one of claims 1 to 4, wherein the cross-sectional shape of the solder portion and the connection portion is rectangular, and the length of the solder portion coincides with the length of the rectangular long side of the cross-section of the connection portion, and the solder layer is formed on the surface of the solder portion corresponding to the rectangular long side of the cross-section of the connection portion.
7. The solder strip of any of claims 1 to 4, wherein the material of the substrate comprises copper and the material of the solder layer comprises tin.
8. The solder strip according to any of claims 1 to 4, wherein the thickness of the solder layer on the solder joint is 30 μm-45 μm.
9. The solder strip according to any of claims 1 to 4, wherein the thickness of the solder layer on the connection portion is 10 μm-25 μm.
10. A battery assembly comprising the welding strip according to any one of claims 1 to 9 and a plurality of battery pieces, wherein a plurality of the welding points of the welding strip are sequentially welded with the plurality of battery pieces, one of the two adjacent welding points is welded with the front surface of the corresponding battery piece, and the other welding point is welded with the back surface of the corresponding battery piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320385585.8U CN219696467U (en) | 2023-03-03 | 2023-03-03 | Solder strip and battery assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320385585.8U CN219696467U (en) | 2023-03-03 | 2023-03-03 | Solder strip and battery assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219696467U true CN219696467U (en) | 2023-09-15 |
Family
ID=87940054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320385585.8U Active CN219696467U (en) | 2023-03-03 | 2023-03-03 | Solder strip and battery assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219696467U (en) |
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2023
- 2023-03-03 CN CN202320385585.8U patent/CN219696467U/en active Active
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