CN212676285U - Photovoltaic module - Google Patents
Photovoltaic module Download PDFInfo
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- CN212676285U CN212676285U CN202021650935.1U CN202021650935U CN212676285U CN 212676285 U CN212676285 U CN 212676285U CN 202021650935 U CN202021650935 U CN 202021650935U CN 212676285 U CN212676285 U CN 212676285U
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- solder
- photovoltaic module
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- welding
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- 229910000679 solder Inorganic materials 0.000 claims abstract description 137
- 238000003466 welding Methods 0.000 claims abstract description 61
- 239000000853 adhesive Substances 0.000 claims description 46
- 230000001070 adhesive effect Effects 0.000 claims description 46
- 239000002245 particle Substances 0.000 claims description 15
- 229910052718 tin Inorganic materials 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 11
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000005476 soldering Methods 0.000 description 14
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- -1 gallium arsenide Chemical class 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
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- 229920000098 polyolefin Polymers 0.000 description 1
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- 230000008646 thermal stress Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
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
Abstract
The utility model discloses a photovoltaic module, photovoltaic module includes: the battery comprises a plurality of battery pieces, a plurality of secondary grid lines and a plurality of battery pieces, wherein each battery piece is provided with a plurality of secondary grid lines arranged at intervals; the welding strip comprises a plurality of welding strips, the welding strips are arranged at intervals along the length direction of the secondary grid lines, each welding strip extends along the arrangement direction of the secondary grid lines, each welding strip is electrically connected with the secondary grid lines, each welding strip is bonded with the battery piece through a plurality of bonding pieces, and at least one secondary grid line is arranged between every two adjacent bonding pieces along the length direction of the welding strips. According to the utility model discloses a photovoltaic module is connected with a plurality of vice grid line electricity through making every solder strip to make every solder strip bond and every bonding member is located between two adjacent vice grid lines through a plurality of bonding members, can improve the firm nature of being connected between solder strip and the vice grid line when increasing the battery piece and welding the contact force between the strip, thereby improve photovoltaic module's reliability.
Description
Technical Field
The utility model belongs to the technical field of the photovoltaic power generation technique and specifically relates to a photovoltaic module is related to.
Background
When manufacturing a photovoltaic module, a plurality of battery pieces are generally welded by using a welding strip to form a battery string, then the plurality of battery strings are laid between glass and a back plate and connected in series by using bus bars, and then lamination and framing are carried out. In the related art, the contact force between the solder strip and the cell is small, so that the reliability of the photovoltaic module is low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a photovoltaic module can improve the contact force between battery piece and the solder strip, improves photovoltaic module's reliability.
According to the utility model discloses photovoltaic module, include: the battery comprises a plurality of battery pieces, a plurality of secondary grid lines and a plurality of battery pieces, wherein each battery piece is provided with a plurality of secondary grid lines arranged at intervals; the welding strip comprises a plurality of welding strips, the welding strips are arranged at intervals along the length direction of the secondary grid lines, each welding strip extends along the arrangement direction of the secondary grid lines, each welding strip is electrically connected with the secondary grid lines, each welding strip is bonded with the battery piece through a plurality of bonding pieces, and at least one secondary grid line is arranged between every two adjacent bonding pieces along the length direction of the welding strips.
According to the utility model discloses photovoltaic module is through making every weld the area and being connected with the equal electricity of a plurality of vice grid lines to make every weld the area and bond and be equipped with at least one vice grid line along the length direction who welds the area, two adjacent bonding pieces through a plurality of bonding pieces and battery piece, can improve the firm nature of being connected between area and the vice grid line in the increase battery piece and the contact force of welding between the area, thereby improve photovoltaic module's reliability. In addition, the main grid lines do not need to be arranged on the cell pieces, on one hand, the use amount of silver paste can be reduced, the cost is reduced, on the other hand, the shielding of the main grid lines on the cell pieces can be avoided, and the optical utilization rate of the photovoltaic module is further improved.
According to some embodiments of the invention, each of the bonding members is located between two adjacent secondary grid lines.
According to some embodiments of the present invention, the width of the adhesive member along the length direction of the sub-grid line is less than or equal to the width of the solder strip.
According to some embodiments of the invention, the height of the adhesive member is less than or equal to the height of the secondary grid line.
According to some embodiments of the utility model, along the length direction of welding the area, be close to adjacent two at the edge of battery piece the distance between the bonding member is less than and is located adjacent two at the battery piece middle part the distance between the bonding member.
According to some embodiments of the utility model, every the bonding member is the insulating part, every the bonding member sets up with adjacent two the equal interval of vice grid line.
According to some embodiments of the invention, each of the adhesive members contacts at least one of the adjacent two of the secondary grid lines.
According to some embodiments of the invention, each of the adhesive members is printed on the battery sheet; or each said adhesive member is coated on said solder strip.
According to some embodiments of the invention, each of the bonding members is a resin bonding agent.
According to some embodiments of the present invention, each of the bonding members includes one of conductive particles and non-conductive particles, and a resin.
According to some embodiments of the present invention, when each of the adhesives includes conductive particles and a resin, the conductive particles are at least one of Au, Ag, Cu, and Sn.
According to some embodiments of the invention, a plurality of the adhesive members are arranged in an array on the battery sheet.
According to the utility model discloses a some embodiments, follow the length direction of welding the area the number of bonding member is X, follows the length direction of vice grid line the number of bonding member is Y, wherein X, Y satisfies respectively: x is more than or equal to 2 and less than or equal to 130, and Y is more than or equal to 5 and less than or equal to 30.
According to the utility model discloses a some embodiments, the solder strip includes electrically conductive base member and soldering tin layer, the cladding of soldering tin layer is in outside the electrically conductive base member, the melting point temperature on soldering tin layer is T, wherein T satisfies: t is more than or equal to 110 ℃ and less than or equal to 145 ℃.
According to some embodiments of the utility model, the solder strip is circular solder strip, triangle-shaped solder strip, rectangle solder strip, or the combination of triangle-shaped solder strip and rectangle solder strip.
According to the utility model discloses a some embodiments, the solder strip includes conductive substrate and soldering tin layer, the cladding of soldering tin layer is in outside the conductive substrate, work as when the solder strip is circular solder strip, the diameter of solder strip is d, the thickness on soldering tin layer is t, wherein d, t satisfy respectively: d is more than or equal to 0.15mm and less than or equal to 0.35mm, and t is more than or equal to 10 mu m and less than or equal to 20 mu m.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;
fig. 2a is a schematic structural diagram of a battery cell according to an embodiment of the present invention;
fig. 2b is a schematic structural diagram of a battery cell according to another embodiment of the present invention;
fig. 3 is a schematic structural view of a photovoltaic module according to an embodiment of the present invention;
FIG. 4 is a partial cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a cross-sectional schematic view of a weld bead according to one embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a weld bead according to another embodiment of the present invention;
FIG. 7 is a cross-sectional schematic view of a weld bead according to yet another embodiment of the present invention;
fig. 8 is a schematic cross-sectional view of a solder strip in accordance with yet another embodiment of the present invention.
Reference numerals:
1: a battery piece; 11: a secondary gate line; 2: welding a strip;
21: a conductive base; 22: a solder layer; 23: a triangular solder ribbon section;
24: a rectangular solder ribbon section; 3: and (4) bonding the parts.
Detailed Description
Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.
A photovoltaic module according to an embodiment of the present invention is described below with reference to fig. 1 to 8. The photovoltaic module may be a heterojunction (a special PN junction formed by sequentially depositing two or more different semiconductor material films on the same substrate, the materials having different energy band gaps, and they may be a compound such as gallium arsenide, or a semiconductor alloy such as silicon-germanium) module.
As shown in fig. 3 and 4, the photovoltaic module according to the embodiment of the present invention includes a plurality of battery pieces 1 and a plurality of solder strips 2. In the description of the present invention, "a plurality" means two or more.
Each cell 1 is provided with a plurality of secondary grid lines 11 arranged at intervals. For example, in the example of fig. 1 to 3, the battery piece 1 may be a single crystal battery piece, the battery piece 1 is substantially rectangular, and four corners of the battery piece 1 are arc-shaped. The plurality of finger lines 11 may extend in the left-right direction and be arranged at regular intervals in the up-down direction. The plurality of secondary grid lines 11 may be parallel to each other and all parallel to two opposite edges of the battery sheet 1. Therefore, by arranging the plurality of sub-grid lines 11, the plurality of sub-grid lines 11 can guide the current generated by the photovoltaic effect of the cell 1. Moreover, the main grid line can be omitted from the cell piece 1, so that on one hand, the usage amount of silver paste can be reduced, the cost is reduced, on the other hand, the shielding of the main grid line on the cell piece 1 can be avoided, and the optical utilization rate of the photovoltaic module is improved.
The plurality of solder strips 2 are arranged at intervals along the length direction of the sub-grid lines 11, and each solder strip 2 extends along the arrangement direction of the plurality of sub-grid lines 11. For example, in the example of fig. 3, seven solder strips 2 are shown, the seven solder strips 2 extend in the up-down direction and are arranged at intervals in the left-right direction, the seven solder strips 2 are parallel to each other and are parallel to the other two opposite sides of the battery piece 1, and the solder strips 2 are perpendicular to the busbar lines 11. Each solder ribbon 2 is electrically connected to a plurality of finger lines 11. Thus, the plurality of solder strips 2 thus arranged can carry out the current guided by the plurality of finger lines 11.
As shown in fig. 2a and 2b, each solder strip 2 is bonded to the battery piece 1 by a plurality of bonding members 3, and at least one secondary grid line 11 is arranged between two adjacent bonding members 3 along the length direction of the solder strip 2. Therefore, when one auxiliary grid line 11 is arranged between every two adjacent auxiliary grid lines 11 along the length direction of the welding strip 2 and between every two adjacent auxiliary grid lines 3, the number of the adhesive pieces 3 is one less than that of the auxiliary grid lines 11, and the firm connection between the welding strip 2 and the battery piece 1 can be effectively ensured; when being equipped with a plurality of vice grid lines 11 along the length direction of solder strip 2, between two adjacent bonding pieces 3, the quantity of bonding piece 3 is less relatively to can reduce sheltering from to battery piece 1, guarantee photovoltaic module's optical utilization. Compared with the existing photovoltaic module, the contact force between the battery piece 1 and the welding strip 2 can be increased, and the connection between the welding strip 2 and the auxiliary grid line 11 is firmer, so that the reliability of the photovoltaic module can be improved.
It should be noted that seven solder strips 2 are shown in fig. 3 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of solder strips 2, which also falls within the protection scope of the present invention.
According to the utility model discloses photovoltaic module is connected with a plurality of vice grid line 11 electricity through making every solder strip 2 to make every solder strip 2 bond and follow the length direction who welds and take 2 through a plurality of bonding pieces 3 and battery piece 1, be equipped with at least one vice grid line 11 between two adjacent bonding pieces 3, can be in the contact force of increase battery piece 1 and solder strip 2 between, improve the firm nature of being connected between solder strip 2 and the vice grid line 11, thereby improve photovoltaic module's reliability. In addition, can need not to set up the main grid line on the battery piece 1, on the one hand, can reduce the use amount of silver thick liquid, reduce cost, on the other hand, can avoid the main grid line to the sheltering from of battery piece 1, further improve photovoltaic module's optical utilization.
In some embodiments of the present invention, referring to fig. 2a and 3, each adhesive member 3 is located between two adjacent secondary grid lines 11. So set up, a plurality of bonding members 3 can be when the contact force between increase battery piece 1 and solder strip 2, be photovoltaic module's simple structure, the convenient arrangement.
Alternatively, the width of the adhesive member 3 in the length direction of the finger 11 may be equal to or less than the width of the solder ribbon 2. Thus, the light shielding area of the adhesive member 3 can be effectively reduced while the firm connection between the solder strip 2 and the battery piece 1 is ensured.
In some optional embodiments of the present invention, the height of the bonding member 3 may be less than or equal to the height of the secondary grid line 11. Due to the arrangement, the welding between the welding strip 2 and the secondary grid line 11 can be prevented from being influenced by the overlarge height of the bonding piece 3, and therefore the welding firmness can be ensured.
Further, referring to fig. 2b, the distance between two adjacent adhesive members 3 adjacent to the edge of the battery piece 1 in the length direction of the solder strip 2 is smaller than the distance between two adjacent adhesive members 3 located at the middle of the battery piece 1.
Here, it should be noted that "the middle of the cell sheet 1" is to be broadly understood to mean a portion near the middle of the cell sheet 1 with respect to the edge of the cell sheet 1, and is not limited to mean only the center of the cell sheet 1. From this, through above-mentioned setting, the binder 3 of the edge of neighbouring battery piece 1 distributes more densely, and the distribution of the binder 3 that is located the middle part of battery piece 1 is comparatively sparse, when guaranteeing to weld firm being connected of taking 2 and battery piece 1, can effectively promote the welding pulling force between welding strip 2 and the vice grid line 11 to make photovoltaic module have excellent electrical property.
In some embodiments of the present invention, each bonding member 3 is an insulating member, and each bonding member 3 is disposed at an interval from two adjacent secondary grid lines 11, as shown in fig. 4. From this, through making every adhesive member 3 of insulating and two adjacent vice grid lines 11 all separate each other, can avoid adhesive member 3 to cover vice grid line 11 and influence the electric connection between vice grid line 11 and the solder strip 2 that corresponds to can guarantee the normal output of electric current, make photovoltaic module have higher output.
Of course, the present invention is not limited thereto, and in other embodiments of the present invention, each adhesive member 3 contacts at least one of the two adjacent finger lines 11. For example, when the adhesive member 3 may be conductive, the adhesive member 3 may be in contact with at least one of the adjacent two finger lines 11. At this time, the adhesive member 3 is electrically connected to both the solder ribbon 2 and at least one of the two adjacent finger lines 11. The current can be transferred from the finger 11 in contact with the bonding member 3 to the bonding member 3 and finally to the solder ribbon 2 to achieve the output of the current. So set up, when guaranteeing to weld the firm connection between area 2 and the battery piece 1, can reduce vice grid line 11 and weld the resistance between the area 2, be favorable to the normal output of electric current, and simple structure, processing is convenient.
Alternatively, each adhesive member 3 may be printed on the battery sheet 1. For example, in manufacturing, a plurality of adhesive members 3 may be printed on a surface of the battery sheet 1 facing the plurality of solder strips 2, and then the solder strips 2 may be connected to the busbar 11 by welding and adhered to the battery sheet 1. Therefore, through the arrangement, each bonding piece 3 can be accurately printed between two adjacent secondary grid lines 11 while firm connection between the welding strip 2 and the battery piece 1 is achieved, and operation is convenient.
Of course, the present invention is not limited thereto, and each adhesive member 3 may be coated on the solder strip 2. So set up, can realize the firm connection between welding area 2 and the battery piece 1 equally, and can avoid the printing area of bonding member 3 too big to can reduce material cost.
Alternatively, each adhesive member 3 may be a resin adhesive. For example, each adhesive member 3 may be a polyvinyl acetal member, a polycarbonate member, a nylon member, a polysulfone member, or the like. But is not limited thereto. With the arrangement, each bonding member 3 has good heat resistance, and the connection firmness between the welding strip 2 and the battery piece 1 can be further ensured.
Or alternatively, each of the adhesive members 3 may include one of conductive particles and non-conductive particles, and a resin. That is, each of the adhesive members 3 may include conductive particles and resin, or non-conductive particles and resin. For example, when each of the adhesives 3 includes conductive particles and a resin, the conductive particles may be at least one of Au, Ag, Cu, and Sn. But is not limited thereto. Therefore, when each bonding member 3 comprises conductive particles and resin, the bonding member 3 has good conductivity, so that the manufacturing of the photovoltaic module is facilitated while the firm connection between the solder strip 2 and the cell 1 is ensured.
In some embodiments of the present invention, as shown in fig. 2a and 3, a plurality of bonding members 3 are arranged in an array on the battery sheet 1. For example, in the example of fig. 2a and 3, six rows and seven columns of adhesive members 3 are provided between the battery sheet 1 and the solder strips 2, the seven columns of adhesive members 3 corresponding to the seven solder strips 2, respectively, each column including six adhesive members 3. From this, the bonding member 3 that so sets up simple structure, processing is convenient, and distributes more evenly to it is comparatively even to make the contact force between a plurality of solder strips 2 and the battery piece 1.
Optionally, with reference to fig. 3, the number of the adhesive pieces 3 in the length direction of the solder strip 2 is X, and the number of the adhesive pieces 3 in the length direction of the finger line 11 is Y, where X, Y respectively satisfy: x is more than or equal to 2 and less than or equal to 130, and Y is more than or equal to 5 and less than or equal to 30. For example, in the example of fig. 3, a plurality of solder strips 2 are arranged along the length direction of the finger line 11, and the arrangement direction of the solder strips 2 is perpendicular to the length direction of the solder strips 2. The number Y of the adhesive members 3 in the length direction of the sub-grid line 11 is the number of the solder strips 2. Specifically, when X is less than 2, the number of the bonding members 3 between each solder strip 2 and the battery piece 1 is too small, and the solder strips 2 may not be firmly connected to the battery piece 1; when X is larger than 130, the number of the bonding pieces 3 between each welding strip 2 and the battery piece 1 is too large, the structure is complex, the cost is high, and the operation is inconvenient. When Y is less than 5, the number of the bonding pieces 3 in the length direction of the sub-grid line 11 is too small, that is, the number of the solder strips 2 is too small, and the current collected at the sub-grid line 11 may not be well conveyed; when Y > 30, the number of the adhesive members 3 in the length direction of the sub-grid line 11 is too large, that is, the number of the solder strips 2 is too large, which may reduce the structural strength of the cell sheet 1 and the yield of the photovoltaic module. Thus, X, Y satisfy: x is more than or equal to 2 and less than or equal to 130, Y is more than or equal to 5 and less than or equal to 30, the firm connection between the welding strip 2 and the cell 1 is ensured, the current can be well output, the yield of the photovoltaic module can be improved, and the processing is convenient.
In some embodiments of the present invention, the solder ribbon 2 includes a conductive base 21 and a solder layer 22, and the solder layer 22 is coated outside the conductive base 21. The conductive substrate 21 may be a copper substrate, a copper-aluminum alloy substrate, a copper-silver-aluminum alloy substrate, or the like. But is not limited thereto.
Specifically, the solder layer 22 may be composed of Sn (tin, a metal element having a silvery-white luster) and Bi (bismuth, an element of group VA 83 of the sixth period of the periodic table). Among them, Sn has a low melting point, is soft and ductile, and plays an important role in the soldering between the solder ribbon 2 and the finger 11. The Bi element can reduce the melting point temperature of the soldering tin layer 22, so that the welding temperature of the solder strip 2 can be reduced, the yield of the photovoltaic module is improved, and the generation of cold solder joint is avoided. And has no pollution and is environment-friendly.
Alternatively, the solder layer 22 may also be composed of Sn, Bi, and Pb. Thus, by adding Pb to the solder layer 22, the surface tension and viscosity of the solder layer 22 can be reduced, so that the solder layer 22 has good wettability and can absorb thermal stress generated by temperature change well.
Wherein, the content of Bi is 10 to 70 percent, the content of Sn is 35 to 65 percent, and the content of Pb is 10 to 40 percent. Specifically, for example, when the solder layer 22 is composed of Sn, Bi, and Pb, the content of Sn may be fixed, the content of Bi may be different, and the melting point temperature of the solder layer 22 may be different. For every 1% increase in Bi content, the Pb content is correspondingly reduced by 1%, and the melting point temperature can be reduced by about 2 ℃. However, the content of Bi cannot be too high, and when the content of Bi is too high, the greater the reliability risk, the more brittle the solder strip 2 is, and the more easily oxidized. Thus, by setting the Bi content to 10% to 70%, the melting point of the solder layer 22 can be lowered, and the low-temperature brittleness and oxidation can be prevented.
Optionally, the solder layer 22 has a melting point temperature T, where T satisfies: t is more than or equal to 110 ℃ and less than or equal to 145 ℃. Specifically, for example, when T < 110 ℃, the melting point temperature of the solder layer 22 is too low and brittleness is large, so that reliability of the solder ribbon 2 is low; when T > 145 ℃, the melting point temperature of the solder layer 22 is too high, which causes the soldering temperature of the solder ribbon 2 to be high, which may result in a high defect rate of the photovoltaic module and may cause a cold joint. Thus, by making T satisfy: t is more than or equal to 110 ℃ and less than or equal to 145 ℃, the melting point temperature of the soldering tin layer 22 is reasonable, and the soldering strip 2 is a low-temperature soldering strip, so that the yield of the photovoltaic module can be improved, the generation of cold solder joint can be avoided, the low-temperature brittleness can be reduced, and the reliability of the soldering strip 2 can be improved.
Alternatively, as shown in fig. 5-7, the solder strip 2 may be a circular solder strip, a triangular solder strip, a rectangular solder strip, or the like. Therefore, when the welding strip 2 is a circular welding strip, continuous welding with the battery piece 1 can be realized, the series resistance can be reduced, and the risk of hidden cracking of the battery piece 1 is reduced; when the welding strip 2 is a triangular welding strip, the welding strip 2 has good welding performance and good reflection effect, and can improve the conversion efficiency; when the welding strip 2 is a rectangular welding strip, the welding strip 2 is flat and has small thickness, so that the contact area between the welding strip 2 and the battery piece 1 can be increased, and the firm connection between the welding strip 2 and the battery piece 1 is realized.
Of course, the present invention is not limited to this, and referring to fig. 8, the solder strip 2 may also be a combination of a triangular solder strip and a rectangular solder strip. For example, in the example of fig. 8, the solder ribbon 2 includes a triangular solder ribbon section 23 and a rectangular solder ribbon section 24, and the triangular solder ribbon section 23 and the rectangular solder ribbon section 24 are connected to each other in the length direction of the solder ribbon 2. For example, the rectangular solder strip section 24 can be connected to the back of the battery piece 1, the welding area of the rectangular solder strip section 24 and the battery piece 1 is large, and the welding tension can be improved, so that the reliability of the photovoltaic module can be ensured, and the rectangular solder strip section 24 does not occupy the front area of the battery piece 1. The triangular solder strip section 23 can be connected to the front of the adjacent cell piece 1, and light irradiated on the triangular solder strip section 23 can be finally reflected to the cell piece 1, so that the optical utilization rate of the front of the photovoltaic module can be effectively improved, and the power of the photovoltaic module is improved. So set up, when guaranteeing that solder strip 2 has better welding performance, can realize with 1 continuous welding of battery piece, and can effectively improve photovoltaic module's optical utilization.
In some embodiments of the present invention, when the solder strip 2 is a circular solder strip, the diameter of the solder strip 2 is d, the thickness of the solder layer 22 is t, wherein d and t satisfy respectively: d is more than or equal to 0.15mm and less than or equal to 0.35mm, and t is more than or equal to 10 mu m and less than or equal to 20 mu m.
Specifically, for example, when d < 0.15mm, the diameter of the solder ribbon 2 is excessively small, and a problem of poor soldering such as cold solder may occur; when d is larger than 0.35mm, the diameter of the solder strip 2 is too large, so that the shielding area of the cell 1 may be increased, and the conversion efficiency of the photovoltaic module is affected. When t is1When t is less than 10 μm, the thickness of the solder layer 22 is too small, and it is possible to reduce the quality of the solder joint between the solder ribbon 2 and the finger 111Above 20 μm, this leads to an excessive cost of the entire solder strip 2. Thus, by making d, t1Respectively satisfy: d is more than or equal to 0.15mm and less than or equal to 0.35mm, and t is more than or equal to 10 mu m1Less than or equal to 20 mu m, can reduce the shielding of the battery piece 1 while ensuring the welding quality between the welding strip 2 and the battery piece 1, and has lower cost.
Optionally, the photovoltaic module may include an upper glass layer, a front adhesive film layer, a solar cell module, a back adhesive film layer, and a lower cover plate. Wherein, the front adhesive film layer and the back adhesive film layer can be POE (ethylene-octylene copolymer, novel polyolefin thermoplastic elastomer with narrow relative molecular mass distribution and narrow comonomer distribution and controllable structure developed by taking metallocene as a catalyst) layer or EVA (ethylene-vinyl acetate copolymer is a general high molecular polymer) layer and the like. The lower cover plate may be glass or a back plate. The solar cell module can be connected by a plurality of cell sheets 1 through solder strips 2, for example, low-temperature solder strips, to achieve current output.
Other constructions and operations of photovoltaic modules according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (16)
1. A photovoltaic module, comprising:
the battery comprises a plurality of battery pieces, a plurality of secondary grid lines and a plurality of battery pieces, wherein each battery piece is provided with a plurality of secondary grid lines arranged at intervals;
the welding strip comprises a plurality of welding strips, the welding strips are arranged at intervals along the length direction of the secondary grid lines, each welding strip extends along the arrangement direction of the secondary grid lines, each welding strip is electrically connected with the secondary grid lines, each welding strip is bonded with the battery piece through a plurality of bonding pieces, and at least one secondary grid line is arranged between every two adjacent bonding pieces along the length direction of the welding strips.
2. The photovoltaic module of claim 1, wherein each of the adhesive members is positioned between two adjacent subgrids.
3. The photovoltaic module of claim 1, wherein a width of the solder strip along the adhesive along the length of the busbar is less than or equal to a width of the solder strip.
4. The photovoltaic module of claim 1, wherein the height of the adhesive is less than or equal to the height of the secondary grid lines.
5. The photovoltaic module of claim 1, wherein a distance between two adjacent bonding members adjacent to the edge of the cell sheet in the length direction of the solder ribbon is smaller than a distance between two adjacent bonding members located in the middle of the cell sheet.
6. The photovoltaic module of any one of claims 1-5 wherein each of the bonding members is an insulator, and each of the bonding members is spaced apart from two adjacent subgrids.
7. The photovoltaic module of any one of claims 1-5 wherein each of the adhesive members is in contact with at least one of two adjacent subgrids.
8. The photovoltaic module of any of claims 1-5 wherein each of the adhesives is printed on the cell sheet; or
Each of the adhesive members is coated on the solder ribbon.
9. A photovoltaic module according to any of claims 1 to 5 wherein each of the adhesives is a resin adhesive.
10. The photovoltaic module of any of claims 1-5 wherein each of the bonding members comprises a resin and one of conductive particles and non-conductive particles.
11. The photovoltaic module according to claim 10, wherein when each of the adhesives includes a conductive particle and a resin, the conductive particle is at least one of Au, Ag, Cu, and Sn.
12. The photovoltaic module of any of claims 1-5 wherein a plurality of the adhesive members are arranged in an array on the cell sheet.
13. The photovoltaic module of any of claims 1-5, wherein the number of the adhesive members is X along the length of the solder strip and Y along the length of the busbar, and wherein X, Y respectively satisfy: x is more than or equal to 2 and less than or equal to 130, and Y is more than or equal to 5 and less than or equal to 30.
14. The photovoltaic module according to any one of claims 1 to 5, wherein the solder ribbon comprises a conductive substrate and a solder layer, the solder layer is coated outside the conductive substrate, the solder layer has a melting point temperature T, wherein T satisfies: t is more than or equal to 110 ℃ and less than or equal to 145 ℃.
15. The photovoltaic module of any of claims 1-5, wherein the solder strip is a circular solder strip, a triangular solder strip, a rectangular solder strip, or a combination of triangular and rectangular solder strips.
16. The photovoltaic module of any of claims 1-5, wherein the solder ribbon comprises an electrically conductive substrate and a solder layer, the solder layer being encapsulated outside the electrically conductive substrate,
when the solder strip is a circular solder strip, the diameter of the solder strip is d, the thickness of the solder layer is t, wherein d and t respectively satisfy the following conditions: d is more than or equal to 0.15mm and less than or equal to 0.35mm, and t is more than or equal to 10 mu m and less than or equal to 20 mu m.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021650935.1U CN212676285U (en) | 2020-08-10 | 2020-08-10 | Photovoltaic module |
| PCT/CN2021/109336 WO2022033322A1 (en) | 2020-08-10 | 2021-07-29 | Photovoltaic module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021650935.1U CN212676285U (en) | 2020-08-10 | 2020-08-10 | Photovoltaic module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033322A1 (en) * | 2020-08-10 | 2022-02-17 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module |
| CN115207138A (en) * | 2021-04-13 | 2022-10-18 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
| WO2023016582A1 (en) * | 2021-08-13 | 2023-02-16 | 中能创光电科技(常州)有限公司 | Photovoltaic cell string and manufacturing method therefor, string soldering device, and photovoltaic assembly |
| CN115207138B (en) * | 2021-04-13 | 2024-04-26 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
-
2020
- 2020-08-10 CN CN202021650935.1U patent/CN212676285U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033322A1 (en) * | 2020-08-10 | 2022-02-17 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module |
| CN115207138A (en) * | 2021-04-13 | 2022-10-18 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
| CN115207138B (en) * | 2021-04-13 | 2024-04-26 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
| WO2023016582A1 (en) * | 2021-08-13 | 2023-02-16 | 中能创光电科技(常州)有限公司 | Photovoltaic cell string and manufacturing method therefor, string soldering device, and photovoltaic assembly |
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