CN115632092A - Photovoltaic module and method for manufacturing same - Google Patents
Photovoltaic module and method for manufacturing same Download PDFInfo
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- CN115632092A CN115632092A CN202211637294.XA CN202211637294A CN115632092A CN 115632092 A CN115632092 A CN 115632092A CN 202211637294 A CN202211637294 A CN 202211637294A CN 115632092 A CN115632092 A CN 115632092A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title description 21
- 238000003466 welding Methods 0.000 claims abstract description 224
- 239000003973 paint Substances 0.000 claims abstract description 54
- 238000000576 coating method Methods 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 52
- 229910000679 solder Inorganic materials 0.000 claims description 64
- 239000000463 material Substances 0.000 claims description 39
- 239000011241 protective layer Substances 0.000 claims description 31
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 29
- 238000005476 soldering Methods 0.000 claims description 15
- 229910052718 tin Inorganic materials 0.000 description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 20
- 229910052802 copper Inorganic materials 0.000 description 20
- 239000010949 copper Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 15
- 229910052782 aluminium Inorganic materials 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 14
- 239000010410 layer Substances 0.000 description 13
- 239000002699 waste material Substances 0.000 description 13
- 229910001174 tin-lead alloy Inorganic materials 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- -1 copper Chemical class 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The embodiment of the application relates to the field of photovoltaics, and provides a photovoltaic module and a manufacturing method thereof, wherein the manufacturing method of the photovoltaic module comprises the following steps: providing a plurality of battery pieces, wherein the battery pieces are all positioned in a first plane, each battery piece is provided with a welding strip, the welding strips extend along a first direction, and the welding strips comprise first connecting parts extending out of the battery pieces; providing a bus bar, wherein the bus bar comprises a second connecting part, the second connecting part is used for being in welding connection with the first connecting part, and welding paint is not arranged on the surface of the bus bar positioned in the first plane or welding paint is arranged on the surface of the second connecting part; and welding the first connecting part and the second connecting part, wherein the bus bar extends along the second direction, and the surface of the second connecting part is provided with welding coating before welding connection. The amount of welding coating in the photovoltaic module can be saved at least.
Description
Technical Field
The embodiment of the application relates to the field of photovoltaics, in particular to a photovoltaic module and a manufacturing method thereof.
Background
In recent years, with the rapid development of the world industry, the demand of the industry for various resources is increasing, the resource reserves of tin as one of the most scarce mineral resources in the world are continuously reduced, and the shortage degree of the tin resources is gradually increased in the future. Therefore, the research on how to reduce the consumption of tin in industrial production has important significance for relieving resource shortage, reducing resource waste and lightening the environmental burden.
With the explosion of the photovoltaic industry, tin, which is one of the most common solder coatings, has a great deal of application demand in photovoltaic modules. In order to realize photovoltaic flat-price networking, the usage amount of the welding coating is also required to be reduced on the premise of not influencing the performance, and the cost of the welding coating is reduced as much as possible.
Disclosure of Invention
The embodiment of the application provides a photovoltaic module and a manufacturing method thereof, which are at least beneficial to reducing the using amount of welding coating in the photovoltaic module.
According to some embodiments of the present application, in one aspect, the present application provides a method for manufacturing a photovoltaic module, including: providing a plurality of battery pieces, wherein the battery pieces are all positioned in a first plane, each battery piece is provided with a welding strip, the welding strips extend along a first direction, and the welding strips comprise first connecting parts extending out of the battery pieces; providing a bus bar, wherein the bus bar comprises a second connecting part, the second connecting part is used for being in welding connection with the first connecting part, and no welding coating is arranged on the surface of the bus bar in the first plane or the surface of the second connecting part is provided with the welding coating; and welding and connecting the first connecting part and the second connecting part, wherein the bus bar extends along a second direction, and the surface of the second connecting part is provided with the welding coating before the welding and connecting.
In some embodiments, the material of the solder coating includes tin.
In some embodiments, if the second connection portion surface of the bus bar is provided with the welding paint, the thickness of the welding paint is 20um to 50um.
In some embodiments, the surface of the bus bar is provided with a protective layer having a thickness smaller than that of the welding paint.
In some embodiments, if the surface of the bus bar in the first plane is not provided with the welding paint, before the welding the first connection portion and the second connection portion, the method further includes: and arranging the welding coating on the surface of the second connecting part.
In some embodiments, after the welding the first connection portion and the second connection portion, the method further includes: providing a junction box, wherein a diode is arranged in the junction box; the provided bus bar further includes: a third connection portion for solder connection with the diode; and welding and connecting the third connecting part with the diode, wherein the surface of the third connecting part is provided with the welding coating before the third connecting part is welded and connected with the diode.
In some embodiments, said solder connecting said third connection portion with said diode comprises: providing a connecting plate; welding the third connecting part and the connecting plate, wherein the surface of the third connecting part is provided with the welding coating before the third connecting part and the connecting plate are welded; and welding and connecting the connecting plate and the diode.
According to some embodiments of the present application, there is also provided in another aspect a photovoltaic module, including: the welding strip is arranged on each battery piece and extends along a first direction, the welding strip is connected with the battery pieces to form a battery string, and the welding strip comprises a first connecting part extending out of the battery pieces; a bus bar including a second connection portion, the bus bar extending in a second direction, and a surface of the bus bar excluding a region of the second connection portion having no welding paint; the first connecting portion is connected to the second connecting portion, a welding portion is provided between the first connecting portion and the second connecting portion, and the bus bar connects the plurality of battery strings to form a battery string set.
In some embodiments, further comprising: the protective layer, the protective layer is located the busbar surface removes the region of second connecting portion, the thickness of protective layer is 1um-50um, the material of protective layer includes at least one in tin, the lead.
In some embodiments, the material of the solder coating includes tin; the material of the soldering portion includes tin.
The technical scheme provided by the embodiment of the application has at least the following advantages:
according to the manufacturing method of the photovoltaic module, the plurality of battery pieces are located in the first plane, each battery piece is provided with the welding strip, the welding strips extend along the first direction, and the welding strips comprise first connecting portions extending out of the battery pieces; providing a bus bar, wherein the bus bar comprises a second connecting part, the second connecting part is used for being in welding connection with the first connecting part, and welding paint is not arranged on the surface of the bus bar positioned in the first plane or welding paint is arranged on the surface of the second connecting part; and welding the first connecting part and the second connecting part, wherein the bus bar extends along the second direction, and the surface of the second connecting part is provided with welding coating before welding connection. In the related art, the entire area of the bus bar surface is provided with the solder coating, however, not all the solder coating of the bus bar surface can be used, which causes a large amount of waste of the solder coating, so that the cost of the photovoltaic module becomes high. Because the welding coating is used for welding the bus bar with other parts in the photovoltaic module, and the welding coating is not actually required to be arranged on the parts, which are not welded with the other parts in the photovoltaic module, of the bus bar, in the manufacturing method of the photovoltaic module provided by the embodiment of the disclosure, the welding coating is arranged on only the surface of the second connecting part, which is required to be welded with the welding strip, of the surfaces, which are located in the same plane, of the bus bar and the cell piece, and the welding coating is not arranged on the surfaces of other areas, that is, the welding coating is not required to be arranged on the whole area of the surface of the bus bar, so that a large amount of welding coating can be saved, and the cost of the photovoltaic module is reduced.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, the drawings are not to scale; in order to more clearly illustrate the embodiments of the present application or technical solutions in the conventional technology, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of a connection structure between a cell and a solder strip in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a bus bar in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view along AA1 of FIG. 2;
fig. 4 is a schematic structural diagram of another bus bar in the manufacturing method of the photovoltaic module according to the embodiment of the present disclosure;
fig. 5 is a schematic structural view of another bus bar in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
FIG. 6 is a schematic cross-sectional view taken along the direction BB1 in FIG. 5;
fig. 7 is a schematic view of a connection structure between a cell and a solder strip and a bus bar in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
fig. 8 is a schematic view of a connection structure of a bus bar and a junction box in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
fig. 9 is a schematic view of another connection structure of a bus bar and a junction box in a manufacturing method of a photovoltaic module according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present disclosure;
fig. 11 is a schematic cross-sectional view of a photovoltaic module according to an embodiment of the present disclosure;
fig. 12 is a schematic view of a position of a bus bar in a photovoltaic module according to an embodiment of the present disclosure.
Detailed Description
As known in the background art, the current manufacturing method of the photovoltaic module has the problem of large using amount of welding coating.
The embodiment of the application provides a manufacturing method of a photovoltaic module, which comprises the steps of firstly providing a plurality of battery pieces, wherein the battery pieces are all located in a first plane, each battery piece is provided with a welding strip, the welding strips extend along a first direction, and each welding strip comprises a first connecting part extending out of the battery piece; providing a bus bar, wherein the bus bar comprises a second connecting part, the second connecting part is used for being in welding connection with the first connecting part, and welding paint is not arranged on the surface of the bus bar positioned in the first plane or is arranged on the surface of the second connecting part; and welding the first connecting part and the second connecting part, wherein the bus bar extends along the second direction, and the surface of the second connecting part is provided with welding coating before welding connection. So, can practice thrift the quantity of welding coating among the photovoltaic module through the mode that sets up welding coating locally.
To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 to 10 are schematic structural diagrams corresponding to steps of a manufacturing method of a photovoltaic module according to an embodiment of the present application.
Referring to fig. 1, a plurality of battery pieces 100 are provided, the battery pieces 100 are located in a first plane, a solder strip 200 is disposed on each battery piece 100, the solder strip 200 extends along a first direction X, and the solder strip 200 includes a first connection portion 201 extending out of the battery piece 100.
In some embodiments, the cell sheet 100 may be a photovoltaic cell sheet. The battery cell 100 has a rectangular shape, and has a long side and a short side, and the length of the long side may be twice the length of the short side.
The plurality of battery pieces 100 are connected by the welding bands 200, and the welding bands 200 connect the plurality of battery pieces 100 into a battery string. The adjacent battery plates connected by the same welding strip 200 have opposite polarities. The solder strip 200 is strip-shaped and extends along the first direction X. The cross-section of the solder strip 200 may have a variety of shapes, and in some embodiments, the cross-section of the solder strip 200 may be circular, oblate, rectangular, triangular, or the like. The solder strips 200 with different shapes can adapt to photovoltaic modules with different structures, and meet different requirements of the photovoltaic modules with different structures.
In some embodiments, the width of the cross section of the solder strip 200 in the cross section perpendicular to the first direction X may be greater than or equal to 0.2mm and less than or equal to 0.29mm. For example, the width of the cross section of the solder strip 200 may be 0.20mm, 0.22mm, 0.24mm, 0.28mm, 0.29mm, etc. If the cross-sectional width of the solder strip 200 is too large, unnecessary waste may be caused; if the cross-sectional width of the solder ribbon 200 is too small, the resistance of the solder ribbon 200 may be too large, which may affect the performance of the photovoltaic module. Therefore, the section width of the solder strip 200 should be selected within a proper range, and when the section width of the solder strip 200 is greater than or equal to 0.2mm and less than or equal to 0.29mm, the solder strip 200 can be ensured to have good performance, and unnecessary waste can be avoided.
In some embodiments, the material of the solder strip 200 may include copper. In other embodiments, the material of the solder strip 200 may also include other conductive materials such as aluminum, for example, the solder strip 200 may include an aluminum strip and a copper layer wrapping the outside of the aluminum strip.
The welding ribbon 200, which connects the plurality of battery cells into a battery string, further includes a first connection portion 201 extending outside the battery string, and the first connection portion 201 is used to be welded to a bus bar in a subsequent step. The first connection portion 201 of the welding ribbon 200 is welded to the bus bar so that the battery string and the bus bar can be electrically connected.
Referring to fig. 2 to 6, a bus bar 300 is provided, the bus bar 300 includes a second connection portion 301, the second connection portion 301 is used for welding connection with the first connection portion 201, and the surface of the bus bar 300 located in the first plane is not provided with the welding paint 400 or the surface of the second connection portion 301 is provided with the welding paint 400.
Fig. 2 is a schematic top view of the bus bar. Fig. 3 is a schematic cross-sectional view along direction AA1 in fig. 2, and fig. 4 is a schematic top view of a bus bar.
Referring to fig. 2 and 3, the bus bar 300 may have a long bar shape. In some embodiments, the cross-section of the bus bar 300 may be rectangular. The rectangle of the cross section of the bus bar 300 may have long sides and short sides, the length of the long side of the rectangle of the cross section of the bus bar 300 may be 4mm to 7mm, and the length of the short side of the rectangle of the cross section of the bus bar 300 may be 0.25mm to 0.4mm. For example, the length of the long side of the rectangle of the cross section of the bus bar 300 may be 4mm, 5mm, 6mm, 7mm, etc., and the length of the short side of the rectangle of the cross section of the bus bar 300 may be 0.25mm, 0.30mm, 0.35mm, 0.4mm, etc. It is understood that the bus bar 300 may have a relatively flat rectangular cross-section.
In some embodiments, the material of the bus bar 300 may include one or more of copper, aluminum, tin. The bus bar 300 may be a copper strip, and the bus bar 300 may also be a copper clad aluminum strip with an inner core of aluminum and an outer layer of copper. When the bus bar 300 is a copper strip, the bus bar 300 has high stability and the bus bar 300 has good conductivity. And when the bus bar 300 is a copper-clad aluminum strip with an inner core of aluminum and an outer layer of copper, the bus bar 300 has higher cost performance, and the cost of the bus bar 300 can be reduced to a certain extent.
The bus bar 300 is used to connect a plurality of battery strings connected by the welding bands 200 into a battery string group. The bus bar 300 has a plurality of second connection portions 301, the second connection portions 301 are regions where the bus bar 300 needs to be welded to the solder strips 200, and in the subsequent step, each second connection portion 301 is connected to the first connection portion 201 of one solder strip 200, so that the bus bar 300 is indirectly electrically connected to each battery sheet 100 in the battery string, and a plurality of battery strings are electrically connected to form a battery string group through the bus bar 300.
Referring to fig. 4, in some embodiments, the surface of the bus bar 300 in the first plane is not provided with the welding paint 400, and before the welding connection of the first connection portion 201 and the second connection portion 301, the welding connection method may further include: welding paint 400 is provided on the surface of second connection portion 301. The first plane is a plane where the plurality of battery pieces 100 are located, and a plane where the bus bar 300 is to be welded to the solder strip 200.
The solder coating 400 is a material required for soldering the bus bar 300 to other components of the photovoltaic module, and the solder coating 400 determines the success of soldering and the quality of soldering. If the welding paint 400 is not present on the area to be welded, the welding quality is affected. Therefore, in some embodiments, before welding the second connection portion 301 of the bus bar 300 with the first connection portion 201 of the solder strip 200, the welding paint 400 is required to be disposed on the surface of the second connection portion 301 of the bus bar 300, so that the welding process can be smoothly completed.
The apparatus for performing the welding process may include: submerged arc welding, gas shielded welding, spot welding, projection welding, seam welding, butt welding, electroslag welding, plasma arc welding, high frequency welding, electron beam welding, ultrasonic welding, friction welding, and the like. In some embodiments, the device for adding the welding paint 400 may be disposed inside the welding apparatus, and the second connection portion 301 of the bus bar 300 is welded with the first connection portion 201 of the welding strip 200 after the addition of the welding paint 400 is completed inside the welding apparatus. In other embodiments, the device for adding the welding paint may also be located outside the welding device, and the addition of the welding paint 400 may be completed before the bus bar 300 and the weld ribbon 200 are fed into the welding device. Moreover, the arrangement mode of the device needs to ensure that the welding coating 400 does not deviate greatly in the process of feeding the bus bar into the welding device, and the device has high stability, wherein the range of the position of the welding coating 400 in the process of feeding the bus bar into the welding device can be less than or equal to 0.1mm.
With continued reference to fig. 4, the welding paint 400 provided on the surface of the second connection portion 301 may be a spot-like welding paint 400, that is, the projection area of the welding paint 400 provided on the first plane may be smaller. In some embodiments, the thickness of the welding paint 400 may be 20-80 um. For example, the thickness of the welding paint 400 may be set to 20um, 30um, 35um, 40um, 45um, 50um, 60um, 65um, 70um, 75um, 80um, etc. If the thickness of the welding paint 400 is too small, the welding process may not be smoothly completed or the welding quality may be poor. If the thickness of the welding paint 400 is excessively large, some waste may be caused. Therefore, when the thickness of the welding dope 400 is set to be 20um-80um, the welding quality can be ensured, and no waste is caused.
The spot welding paint 400 provided on the surface of the second connection portion 301 may have a diameter of 0.2mm or more and 0.29mm or less. For example, the diameter of the welding dope 400 may be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.29mm, or the like. If the diameter of the welding paint 400 is too large, waste of materials may be caused, and if the diameter of the welding paint 400 is too small, welding quality may be reduced, stability of the photovoltaic module may be affected, and implementation difficulty of the manufacturing process may be increased.
In some embodiments, the material of the solder coating 400 may include tin. The melting point of tin is low, and tin has good affinity with metals such as copper, and when a soldering process is performed, tin can be melted into liquid at a low temperature, so that the soldering temperature does not affect materials such as copper in the bus bar 300 and the solder strip 200 to be soldered, and the liquid tin has good fluidity, and is beneficial to improving the soldering quality. In addition, tin as a material of the solder coating 400 has better conductivity, so that the soldered photovoltaic module can maintain better performance. In other embodiments, the material of the solder paste 400 may further include lead, and the solder paste 400 may be a tin-lead alloy. The tin-lead alloy has the characteristics of stable performance, small shrinkage and compact structure, and the tin-lead alloy is used as the material of the welding coating 400, so that the welding quality and stability can be further improved.
Fig. 5 is another schematic top view of the bus bar. Fig. 6 is a schematic cross-sectional view along BB1 in fig. 5.
Referring to fig. 5 and 6, in some embodiments, the surface of the second connection part 301 of the bus bar 300 may be provided with a welding paint 400, and the thickness of the welding paint 400 may be 20um to 50um. For example, the thickness of the welding paint 400 may be 20um, 25um, 30um, 35um, 40um, 45um, 50um, etc. If the thickness of the welding paint 400 is too small, the welding process may not be smoothly completed or the welding quality may be poor. If the thickness of the welding paint 400 is excessively large, some waste may be caused. Therefore, when the thickness of the welding dope 400 is 20um-50um, the welding quality can be ensured, and no waste is caused. At this time, the welding paint 400 on the surface of the second connection portion 301 of the bus bar 300 is provided in the bus bar 300, but is not additionally provided in the subsequent step, and therefore, the thickness range of the welding paint 400 provided by the bus bar 300 is also different from the thickness range of the welding paint 400 additionally provided in the subsequent step, and the thickness range of the welding paint 400 provided by the bus bar 300 may be smaller than or equal to the thickness range of the welding paint 400 additionally provided in the subsequent step.
It is understood that the orthographic projection area of the welding paste 400 on the first plane provided to the surface of the second connection portion 301 of the bus bar 300 may be smaller than or equal to the area of the second connection portion 301 in the bus bar 300, and the orthographic projection area of the welding paste 400 on the first plane provided to the surface of the second connection portion 301 of the bus bar 300 may be larger than or equal to the orthographic projection area of the welding paste 400 on the first plane additionally added in the subsequent step. The shape of the orthographic projection of the welding paint 400 on the first plane provided on the surface of the second connection portion 301 of the provided bus bar 300 may also completely conform to the shape of the first connection portion 201 in the solder ribbon, or the orthographic projection of the welding paint 400 on the first plane provided on the surface of the second connection portion 301 of the provided bus bar 300 may completely cover the first connection portion 201 of the solder ribbon 200. The welding process can also be successfully completed at this time.
With continued reference to fig. 6, in some embodiments, the surface of the bus bar 300 may be provided with a protective layer 500, and the thickness of the protective layer 500 may be less than the thickness of the welding paint 400.
The protective layer 500 is used for protecting the material of the bus bar 300 from being oxidized by the external environment in the use process of the photovoltaic module, so that the stability and the service life of the bus bar 300 are improved, and the performance and the stability of the photovoltaic module are improved. The material of the protection layer 500 may be at least one of tin and lead, and the protection layer 500 may be a tin-lead alloy. It can be seen that the material of the protective layer 500 is substantially the same as that of the welding paint 400, but the protective layer 500 is not used for the welding process, and is only used for the oxidation resistance protection of the bus bar 300. Therefore, the thickness of the protective layer 500 may be smaller than that of the welding paint 400, so that the protective layer 500 can protect the bus bar 300 from being oxidized and does not cause material waste.
In some embodiments, the thickness of the protective layer 500 may be 1um-50um. For example, the thickness of the protective layer 500 may be 1nm, 10nm, 20nm, 30nm, 40nm, 50nm, or the like. If the thickness of the protection layer 500 is too small, the protection layer 500 may not function to protect the bus bar 300 from being oxidized, and if the thickness of the protection layer 500 is too large, waste of materials may be caused, which is not favorable for environmental friendliness and cost reduction.
Referring to fig. 7, the first connection portion 201 (see fig. 1) and the second connection portion 301 (see fig. 2) are connected by welding, and the bus bar extends along the second direction Y, wherein the surface of the second connection portion 301 has the welding paste 400 before the welding connection.
It is understood that, whether the welding dope 400 is provided on the surface of the second connection portion 301 of the provided bus bar 300 or the welding dope 400 is added on the surface of the second connection portion 301 after the bus bar 300 is provided, the second connection portion 301 of the bus bar 300 can be smoothly welded to the first connection portion 201 of the solder strip 200 with the welding dope 400 already on the surface of the second connection portion 301.
The bus bar 300 is welded to the welding strip 200 connecting the plurality of battery sheets 100 such that the bus bar 300 is electrically connected to the plurality of battery sheets 100. The bus bars 300 are welded to the solder ribbons 200 connected to form the battery strings, so that the bus bars 300 connect a plurality of battery strings to form a battery string group.
Referring to fig. 8 to 9, in some embodiments, after the welding connection of the first connection portion 201 and the second connection portion 301, the welding connection may further include: a junction box 600 is provided, in which junction box 600 a diode 601 is provided. The bus bar 300 provided in the preceding step at this time may further include: and a third connection portion 302, wherein the third connection portion 302 is used for being connected with the diode 601 in a welding mode. The junction box 600 is used for connecting and protecting the photovoltaic module, connecting the power generated by the battery cells 100 with an external structure, and conducting the current generated by the photovoltaic module. The diode 601 in the junction box 600 can protect the battery cell 100 and control the current flowing direction. And welding the third connecting part 302 and the diode 601, wherein the surface of the third connecting part 302 is provided with the welding coating 400 before the third connecting part 302 and the diode 601 are welded. In some embodiments, a welding paint 400 may be provided on the surface of the third connection portion 302 in the step of providing the bus bar 300, so that the bus bar 300 is welded to the diode 601 in the junction box 600. In other embodiments, if the surface of the third connection portion 302 of the bus bar 300 is not provided with the welding paint 400, the welding paint 400 may be further disposed on the surface of the third connection portion 302 of the bus bar 300 after the bus bar 300 is provided. The surface of the third connection portion 302 is provided with the welding paint 400 before being welded with the diode 601, and the third connection portion 302 and the diode 601 can be smoothly welded.
Referring to fig. 8, in some embodiments, the third connection portion 302 in the bus bar 300 may be directly solder-connected with the diode 601 in the junction box 600. Only the solder paste 400 is present between the third connection portion 302 and the diode 601.
Referring to fig. 9, in some embodiments, the third connection portion 302 in the bus bar 300 may also be indirectly connected to the diode 601 in the junction box 600 by welding. The solder connection of the third connection portion 302 to the diode 601 may include: providing a connection plate 700; and welding the third connecting part 302 with the connecting plate 700, wherein the surface of the third connecting part 302 is provided with the welding coating 400 before the third connecting part 302 is welded with the connecting plate 700. After the third connection portion 302 is welded to the connection plate 700, the connection plate 700 is welded to the diode 601. The indirect welding connection between the third connection portion 302 and the diode 601 can make the structural arrangement of the photovoltaic module more flexible, and the manufacturing method of the photovoltaic module has stronger operability.
In some embodiments, the material of the connection plate 700 may include copper.
In the manufacturing method of the photovoltaic module, the bus bar comprises the second connecting part, the second connecting part is used for being connected with the first connecting part in a welding mode, and welding paint is not arranged on the surface of the bus bar located in the first plane or welding paint is arranged on the surface of the second connecting part; and welding the first connecting part and the second connecting part, wherein the bus bar extends along the second direction, and the surface of the second connecting part is provided with welding coating before welding connection. Therefore, the using amount of the welding coating in the bus bar welding process can be saved.
Correspondingly, another embodiment of the application also provides a photovoltaic module, and the photovoltaic module can be manufactured by the manufacturing method of the photovoltaic module. The photovoltaic module provided in another embodiment of the present application will be described in detail below with reference to the accompanying drawings, and the same or corresponding portions as or to the previous embodiment may refer to the corresponding descriptions of the previous embodiment, which will not be described in detail below.
Fig. 10 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present application, and fig. 11 is a schematic structural diagram of a cross section along a direction DD1 in fig. 10.
Referring to fig. 10, the photovoltaic module includes: the welding structure comprises a plurality of battery slices 100, wherein each battery slice 100 is provided with a welding strip 200, the welding strips 200 extend along a first direction X, the welding strips 200 are connected with the battery slices 100 to form a battery string 101, and the welding strips 200 comprise first connecting parts 201 (refer to FIG. 1) extending out of the battery slices 100; a bus bar 300, the bus bar 300 including a second connection portion 301 (refer to fig. 2), the bus bar 300 extending in the second direction Y, and a region of a surface of the bus bar 300 excluding the second connection portion 301 having no welding paste 400; the first connection portion 201 is connected to the second connection portion 301, a welding portion 401 is disposed between the first connection portion 201 and the second connection portion 301, and the bus bar 300 connects the plurality of battery strings 101 to form a battery string set.
The plurality of battery pieces 100 are connected by the welding bands 200 to form the battery string 101. The solder strip 200 is strip-shaped and extends along the first direction X. The cross-section of the solder strip 200 may have a variety of shapes, and in some embodiments, the cross-section of the solder strip 200 may be circular, oblate, rectangular, triangular, or the like. The width of the cross section of the solder strip 200 may be 0.2mm or more and 0.29mm or less. For example, the width of the cross section of the solder strip 200 may be 0.20mm, 0.22mm, 0.24mm, 0.28mm, 0.29mm, etc., which not only ensures the solder strip 200 to have good performance, but also avoids unnecessary waste. The material of the solder strip 200 may include copper, and may further include other conductive materials such as aluminum, so that the solder strip 200 has better conductivity.
The bus bar 300 may have a long bar shape. In some embodiments, the cross-section of the bus bar 300 may be rectangular. In some embodiments, the material of the bus bar 300 may include one or more of copper, aluminum, tin. The bus bar 300 may be a copper strip, and the bus bar 300 may also be a copper clad aluminum strip with an inner core of aluminum and an outer layer of copper. When the bus bar 300 is a copper strip, the bus bar 300 has high stability and the bus bar 300 has good conductivity. And when the bus bar 300 is a copper-clad aluminum strip with an inner core of aluminum and an outer layer of copper, the bus bar 300 has higher cost performance, and the cost of the bus bar 300 can be reduced to a certain extent.
In some embodiments, the material of the solder coating may include tin. The melting point of tin is low, and tin has a good affinity with metals such as copper, and when a soldering process is performed, tin can be melted into liquid at a low temperature, so that the soldering temperature does not affect materials such as copper in the soldered bus bar 300 and the soldered strip 200, and the liquid tin has good fluidity, which is beneficial to improving the soldering quality. In addition, tin as a material of the solder coating 400 has better conductivity, so that the soldered photovoltaic module can maintain better performance. In other embodiments, the material of the solder paste 400 may further include lead, and the solder paste 400 may be a tin-lead alloy. The tin-lead alloy has the characteristics of stable performance, small shrinkage and compact structure, and the tin-lead alloy is used as the material of the welding coating 400, so that the welding quality and stability can be further improved.
In some embodiments, the material of solder 401 may include tin. After the soldering process is performed, the soldering paste 400 becomes the soldering portion 401. It is understood that the material of the welding portion 401 is the same as the welding dope 400. The material of the soldering portion 401 may also be tin-lead alloy.
Referring to fig. 11, in some embodiments, the photovoltaic module may further include: and the protective layer 500, wherein the protective layer 500 is positioned on the surface of the bus bar 300 except the area of the second connection part 301. The protective layer 500 is used for protecting the material of the bus bar 300 from being oxidized by the external environment in the use process of the photovoltaic module, so that the stability and the service life of the bus bar 300 are improved, and the performance and the stability of the photovoltaic module are improved.
The thickness of the protective layer 500 may be 1um-50um, for example, the thickness of the protective layer 500 may be 1nm, 10nm, 20nm, 30nm, 40nm, 50nm, etc. If the thickness of the protection layer 500 is too small, the protection layer 500 may not be able to protect the bus bar 300 from being oxidized, and if the thickness of the protection layer 500 is too large, the material may be wasted, which is not favorable for environmental protection and cost reduction.
The material of the protective layer 500 may include at least one of tin and lead. The protective layer 500 may be a tin-lead alloy. It can be seen that the material of the protective layer 500 is substantially the same as that of the welding paint 400, but the protective layer 500 is not used for the welding process, and is only used for the oxidation resistance protection of the bus bar 300. Therefore, the thickness of the protective layer 500 may be smaller than that of the welding paint 400, so that the protective layer 500 can protect the bus bar 300 from being oxidized and does not cause material waste.
Referring to fig. 12, fig. 12 is a schematic view illustrating a position of a bus bar 300 in a photovoltaic module according to an embodiment of the present disclosure. It can be seen that there can be multiple bus bars 300 in the photovoltaic module, and the bus bars 300 can be located in the middle and both ends of the photovoltaic module. In addition, the solder strip 200 and the bus bar may be located on the same surface of the battery piece 100, and the solder strip 200 and the bus bar may also be located on two surfaces of the battery piece 100.
In the photovoltaic module provided by the embodiment of the application, the bus bar comprises a second connecting part, the bus bar extends along the second direction, and the area of the surface of the bus bar except the second connecting part is not provided with welding coating; the first connecting portion is connected with the second connecting portion, a welding portion is arranged between the first connecting portion and the second connecting portion, and the bus bar is connected with the plurality of battery strings to form a battery string set. Because only part of the region needing to be welded in the bus bar is provided with the welding coating, the use of the welding coating in the photovoltaic module can be saved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementations of the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and the scope of the present disclosure should be defined only by the appended claims.
Claims (10)
1. A method of manufacturing a photovoltaic module, comprising:
providing a plurality of battery pieces, wherein the battery pieces are all positioned in a first plane, each battery piece is provided with a welding strip, the welding strips extend along a first direction, and the welding strips comprise first connecting parts extending out of the battery pieces;
providing a bus bar, wherein the bus bar comprises a second connecting part, the second connecting part is used for being in welding connection with the first connecting part, and no welding coating is arranged on the surface of the bus bar in the first plane or the surface of the second connecting part is provided with the welding coating;
and welding and connecting the first connecting part and the second connecting part, wherein the bus bar extends along a second direction, and the surface of the second connecting part is provided with the welding coating before the welding and connecting.
2. The method of manufacturing of claim 1, wherein the material of the solder paste comprises tin.
3. The manufacturing method according to claim 1, wherein if the welding paste is provided on the surface of the second connection portion of the bus bar, the welding paste has a thickness of 20um to 50um.
4. The manufacturing method according to claim 1, wherein a protective layer is provided on a surface of the bus bar, and a thickness of the protective layer is smaller than a thickness of the welding dope.
5. The method of manufacturing according to claim 1, wherein if the surface of the bus bar in the first plane is provided without the solder coating, before the solder-connecting the first connection portion and the second connection portion, further comprising: and arranging the welding coating on the surface of the second connecting part.
6. The manufacturing method according to claim 1, further comprising, after the welding the first connection portion and the second connection portion,:
providing a junction box, wherein a diode is arranged in the junction box;
the provided bus bar further includes: a third connection portion for solder connection with the diode;
and welding and connecting the third connecting part with the diode, wherein the surface of the third connecting part is provided with the welding coating before the third connecting part is welded and connected with the diode.
7. The manufacturing method according to claim 6, wherein the solder-connecting the third connection portion and the diode includes:
providing a connecting plate;
welding the third connecting part and the connecting plate, wherein the surface of the third connecting part is provided with the welding coating before the third connecting part and the connecting plate are welded;
and welding and connecting the connecting plate and the diode.
8. A photovoltaic module, comprising:
the welding strip is arranged on each battery piece and extends along a first direction, the welding strip is connected with the battery pieces to form a battery string, and the welding strip comprises a first connecting part extending out of the battery pieces;
a bus bar including a second connection portion, the bus bar extending in a second direction, and a surface of the bus bar having no welding paint except for a region of the second connection portion;
the first connecting portion is connected to the second connecting portion, a welding portion is provided between the first connecting portion and the second connecting portion, and the bus bar connects the plurality of battery strings to form a battery string set.
9. The photovoltaic module of claim 8, further comprising: the protective layer, the protective layer is located the busbar surface removes the region of second connecting portion, the thickness of protective layer is 1um-50um, the material of protective layer includes at least one in tin, the lead.
10. The photovoltaic module of claim 8 wherein the solder coating material comprises tin; the material of the soldering portion includes tin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637294.XA CN115632092A (en) | 2022-12-20 | 2022-12-20 | Photovoltaic module and method for manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637294.XA CN115632092A (en) | 2022-12-20 | 2022-12-20 | Photovoltaic module and method for manufacturing same |
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| CN115632092A true CN115632092A (en) | 2023-01-20 |
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| CN202211637294.XA Pending CN115632092A (en) | 2022-12-20 | 2022-12-20 | Photovoltaic module and method for manufacturing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206820008U (en) * | 2017-06-30 | 2017-12-29 | 韩华新能源（启东）有限公司 | A kind of photovoltaic module welding strip |
| CN212874508U (en) * | 2020-09-29 | 2021-04-02 | 韩华新能源（启东）有限公司 | Laminated sheet assembly and photovoltaic assembly |
| CN213752732U (en) * | 2020-12-08 | 2021-07-20 | 泰州隆基乐叶光伏科技有限公司 | Busbar and photovoltaic module |
| CN214411225U (en) * | 2021-04-20 | 2021-10-15 | 苏州阿特斯阳光电力科技有限公司 | Battery piece cluster and photovoltaic module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206820008U (en) * | 2017-06-30 | 2017-12-29 | 韩华新能源（启东）有限公司 | A kind of photovoltaic module welding strip |
| CN212874508U (en) * | 2020-09-29 | 2021-04-02 | 韩华新能源（启东）有限公司 | Laminated sheet assembly and photovoltaic assembly |
| CN213752732U (en) * | 2020-12-08 | 2021-07-20 | 泰州隆基乐叶光伏科技有限公司 | Busbar and photovoltaic module |
| CN214411225U (en) * | 2021-04-20 | 2021-10-15 | 苏州阿特斯阳光电力科技有限公司 | Battery piece cluster and photovoltaic module |
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