CN219371044U - Photovoltaic module - Google Patents
Photovoltaic module Download PDFInfo
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- CN219371044U CN219371044U CN202223318591.6U CN202223318591U CN219371044U CN 219371044 U CN219371044 U CN 219371044U CN 202223318591 U CN202223318591 U CN 202223318591U CN 219371044 U CN219371044 U CN 219371044U
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- 239000000853 adhesive Substances 0.000 claims abstract description 58
- 230000001070 adhesive effect Effects 0.000 claims abstract description 58
- 238000003466 welding Methods 0.000 claims abstract description 57
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000003292 glue Substances 0.000 claims description 25
- 239000011521 glass Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 11
- 238000003475 lamination Methods 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 5
- 229910000679 solder Inorganic materials 0.000 description 26
- 239000000463 material Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 description 3
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 description 3
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000011231 conductive filler Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- -1 silver-aluminum Chemical compound 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- KHZAWAWPXXNLGB-UHFFFAOYSA-N [Bi].[Pb].[Sn] Chemical compound [Bi].[Pb].[Sn] KHZAWAWPXXNLGB-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910001174 tin-lead alloy Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The metal electrodes of the back contact battery pieces only comprise a plurality of positive thin grids and a plurality of negative thin grids which extend along the O-Y direction, and the positive thin grids and the negative thin grids are parallel and are alternately arranged along the O-X direction; the welding strips comprise positive electrode connecting sections and negative electrode connecting sections which are respectively and electrically connected with the positive electrode fine grid connection and the negative electrode fine grid connection of two adjacent back contact battery pieces; the welding strip is adhered to the back contact battery piece through an insulating adhesive block, the insulating adhesive block is arranged at the joint of the positive electrode connecting section and the negative electrode fine grid and at the joint of the negative electrode connecting section and the positive electrode fine grid, the positive electrode connecting section is in physical contact with the positive electrode fine grid, and the negative electrode connecting section is in physical contact with the negative electrode fine grid. The photovoltaic module does not need high-temperature welding, can reduce the warping phenomenon of the battery piece, and reduces the cracking probability in the lamination process.
Description
Technical Field
The utility model relates to the field of photovoltaics, in particular to a photovoltaic module capable of reducing the warping phenomenon of a battery piece to a great extent.
Background
With the continuous development of PERC battery technology, the efficiency of the PERC battery technology gradually reaches the theoretical efficiency, the efficiency breakthrough cannot be carried out, and a new battery platform technology is generated. The back contact solar cell (Interdigitated Back Contact, IBC cell) is a cell with main and auxiliary grid lines of positive and negative electrodes all positioned on the back of the cell piece; the shielding loss and the resistance loss of the front metal grid line can be obviously reduced.
Compared with the traditional PERC, topcon and HJT batteries with the positive electrode and the negative electrode respectively positioned on the front side and the back side of the battery piece, the connection mode of the battery piece and the battery piece of the back contact battery piece is simpler, the welding strips are only connected with each other on the back side of the battery piece, the connection process from the front side to the back side is not involved, interlayer fracturing pieces can be avoided, the gap between the pieces is reduced, and the packaging density of the assembly is improved. However, the warpage of the battery cell is liable to occur, resulting in the possibility of occurrence of cracking after lamination of the assembly.
In view of the foregoing, there is a need for an improved photovoltaic module that solves the above-described problems.
Disclosure of Invention
The utility model aims to provide a photovoltaic module.
In order to achieve one of the above purposes, the present utility model adopts the following technical scheme:
a photovoltaic module, comprising:
the metal electrodes on the back of the back contact battery pieces only comprise a plurality of positive thin grids and a plurality of negative thin grids, the positive thin grids and the negative thin grids extend along the O-Y direction perpendicular to the O-X direction, and the positive thin grids and the negative thin grids are parallel and are alternately arranged along the O-X direction;
the welding strips comprise positive electrode connecting sections and negative electrode connecting sections, and the positive electrode connecting sections and the negative electrode connecting sections are respectively and electrically connected with the positive electrode fine grid connection and the negative electrode fine grid connection of two adjacent back contact battery pieces;
the welding strip is adhered to the back contact battery piece through an insulating adhesive block, the insulating adhesive block is arranged at the joint of the positive electrode connecting section and the negative electrode fine grid and at the joint of the negative electrode connecting section and the positive electrode fine grid, the positive electrode connecting section is in physical contact with the positive electrode fine grid, and the negative electrode connecting section is in physical contact with the negative electrode fine grid.
Further, the heights of the insulating glue block, the positive electrode fine grid and the negative electrode fine grid are consistent and are between 15 and 30 mu m.
Further, in the O-Y direction, the width of the insulating glue block is not smaller than the width of the welding strip.
Further, the positive thin gate comprises a plurality of positive gate segments arranged at intervals and positive blank segments positioned between the adjacent positive gate segments, and the negative thin gate comprises a plurality of negative gate segments arranged at intervals and negative blank segments positioned between the adjacent negative gate segments; the positive blank section and the negative blank section are arranged in a staggered manner along the O-Y direction, and the widths of the positive blank section and the negative blank section are larger than the width of the welding strip;
the positive electrode connecting section is connected with the negative electrode blank section, the negative electrode connecting section is connected with the positive electrode blank section, and the insulating rubber block is arranged in the positive electrode blank section or the negative electrode blank section.
Further, all positive blank sections and all negative blank sections are provided with insulating blocks;
or, only the part of the positive electrode blank sections arranged along the O-X direction is provided with an insulating block to support the negative electrode connecting section, and only the part of the negative electrode blank sections arranged along the O-X direction is provided with an insulating block to support the positive electrode connecting section.
Further, the positive thin grid and the negative thin grid are continuous grid lines, and the insulating rubber block is arranged at the joint of all the positive connecting sections and the negative thin grid and the joint of the negative connecting sections and the positive thin grid.
Further, the photovoltaic module is a single glass module, and the insulating rubber block is white; or, the photovoltaic module is a double-glass module, and the insulating rubber block is transparent.
A photovoltaic module, comprising:
the metal electrodes on the back of the back contact battery pieces only comprise a plurality of positive thin grids and a plurality of negative thin grids, the positive thin grids and the negative thin grids extend along the O-Y direction perpendicular to the O-X direction, and the positive thin grids and the negative thin grids are parallel and are alternately arranged along the O-X direction; the positive thin grid comprises a plurality of positive grid segments arranged at intervals and positive blank segments positioned between the adjacent positive grid segments, and the negative thin grid comprises a plurality of negative grid segments arranged at intervals and negative blank segments positioned between the adjacent negative grid segments; the positive blank section and the negative blank section are arranged in a staggered manner along the O-Y direction;
the welding strips comprise positive electrode connecting sections and negative electrode connecting sections, the positive electrode connecting sections and the negative electrode connecting sections are respectively and electrically connected with positive electrode fine grid connection and negative electrode fine grid connection of two adjacent back contact battery pieces, and the widths of the welding strips in the O-Y direction are smaller than the widths of the positive electrode blank sections and the negative electrode blank sections;
the welding strip is adhered to the back contact battery piece through a plurality of conductive adhesive blocks, the conductive adhesive blocks are arranged at the joint of the positive electrode connecting section and the positive electrode fine grid and the joint of the negative electrode connecting section and the negative electrode fine grid, the number of the conductive adhesive blocks connected with each positive electrode connecting section is smaller than that of the positive electrode fine grid, and the positive electrode connecting sections are in physical contact with other positive electrode fine grid lines; the number of the conductive rubber blocks connected with each negative electrode connecting section is smaller than the number of the negative electrode fine grids, and the negative electrode connecting sections are in physical contact with other negative electrode fine grids.
Further, the number of the conductive adhesive blocks connected with each positive electrode connecting section is 1/3-2/3 of the number of the positive electrode fine grids, and the number of the conductive adhesive blocks connected with each negative electrode connecting section is 1/3-2/3 of the number of the negative electrode fine grids.
Further, in the O-X direction, a conductive adhesive block is arranged at the junction of the positive electrode fine grid and the positive electrode connecting section and the junction of the negative electrode fine grid and the negative electrode connecting section at the end part of the back contact battery piece.
Further, a plurality of conductive adhesive blocks connected with the same welding strip are uniformly distributed along the O-X direction.
Further, along the O-Y direction, the width of the conductive adhesive block is not smaller than the width of the welding strip, and the width of the conductive adhesive block is not larger than the lengths of the positive blank section and the negative blank section.
Further, the photovoltaic module is a single glass module, and the conductive adhesive block is white; or, the photovoltaic module is a double-glass module, and the conductive adhesive block is transparent.
Further, the device also comprises at least one fixing film which is positioned on one side of the welding strip, which is away from the back contact battery piece, wherein the fixing film extends along the O-Y direction, and the fixing film covers all the welding strips.
Further, the back contact battery piece is a whole battery or a 1/n slice battery, and n is between 2 and 8.
The beneficial effects of the utility model are as follows: according to the photovoltaic module, the welding strips are bonded through the insulating adhesive blocks and the conductive adhesive blocks, and are in physical contact with the positive thin grid and the negative thin grid to realize electric connection, so that high-temperature welding is not needed, the warping phenomenon of the battery piece can be reduced, and the cracking probability in the lamination process is reduced.
Drawings
FIG. 1 is a schematic back view of a monolithic back contact battery cell in accordance with one embodiment of the present utility model;
FIG. 2 is a schematic illustration of the half back contact battery piece of FIG. 1 cut along the dashed line after being coated with an insulating gel block;
FIG. 3 is a schematic view of the photovoltaic module formed after the series connection of the half-sheet back contact cells of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic view of another photovoltaic module of the present utility model employing an insulating glue to bond the solder strips, illustrating only a portion of the solder strips;
FIG. 7 is a schematic view of another photovoltaic module of the present utility model employing an insulating glue to bond the solder strips;
FIG. 8 is a schematic view of a photovoltaic module employing a conductive paste to bond a solder strip in accordance with the present utility model;
fig. 9 is a schematic view of a photovoltaic module employing a fixed film reinforcement solder strip in accordance with the present utility model.
The device comprises a 1-back contact battery piece, a 11-positive thin gate, a 111-positive gate line segment, a 112-positive blank segment, a 12-negative thin gate, a 121-negative gate line segment and a 122-negative blank segment; 2-welding the tape; 21-positive electrode connecting section, 22-negative electrode connecting section and 3-insulating rubber block; 4-conducting resin blocks; 5-fixing the film; 100-photovoltaic module.
Detailed Description
The present utility model will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the utility model and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the utility model.
In the various illustrations of the utility model, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for convenience of illustration, and thus serve only to illustrate the basic structure of the inventive subject matter.
The inventor finds that in the process of preparing the photovoltaic module: for conventional back contact cells, the host material is still silicon, while the ribbon host material for current conduction is copper, with the surface plated with a tin layer for soldering. Copper and silicon have larger thermal expansion coefficient difference, copper is about 7 times of silicon at the conventional temperature, the positive and negative electrode main grids are positioned on the back of the battery, the metallization area is larger, and when the welding strip 2 is welded on the back of the back contact battery piece, the welding temperature is generally 200-400 ℃, and the melting point of tin is above 200 ℃. Along with the high-temperature welding process, the thermal expansion coefficient of the material is gradually increased, and the larger thermal expansion coefficient difference of the two materials causes the thermal stress concentration at the welding position of the welding belt, particularly at the welding plate, the contact area between the welding belt and the welding belt is large, and the stress is more concentrated. So that the back of the battery is forced to bend toward the back. The components are prone to cracking after lamination and also reduce the mechanical properties of the components.
After extensive research and experimental trials, the inventors propose: the positive and negative main grids on the back of the back contact battery piece 1 are cancelled to be made into the back contact battery piece 1 without the main grids, and meanwhile, the high-temperature welding process is avoided, so that the warping phenomenon of the battery piece is relieved to the greatest extent.
Based on the above conception, the utility model improves the structure of the metal electrode of the back contact battery piece 1 and the connection mode of the metal electrode and the welding strip 2, provides a series connection mode of the back contact battery piece 1 without a main grid and the photovoltaic module 100, and adopts the insulating glue block 3 or the conductive glue block 4 to bond the welding strip 2 instead of high-temperature welding to form a series connection passage.
Referring to fig. 1 to 9, the photovoltaic module 100 of the present utility model includes a plurality of back contact battery pieces 1 arranged along the O-X direction, and a solder strip 2 extending along the O-X direction and connecting two adjacent back contact battery pieces 1, wherein the solder strip 2 is adhered to the back contact battery pieces 1 by an insulating adhesive block 3 and/or a conductive adhesive block 4.
The back contact battery piece 1 can be a whole battery or a 1/n slice battery, and n is between 2 and 8. The present utility model is described in detail with reference to a structure of the photovoltaic module 100 and a serial connection manner thereof, taking half cells as an example.
The back contact battery piece 1 comprises a metal electrode positioned on the back surface of the back contact battery piece, and the metal electrode only comprises a plurality of positive electrode fine grids 11 and a plurality of negative electrode fine grids 12, so that the battery piece is a battery piece without a main grid, the silver-aluminum paste printed on the positive electrode and the negative electrode main grid and the corresponding electrode can be saved, and the manufacturing cost of a battery end is greatly reduced; meanwhile, the shading of the main grid line is reduced, the light receiving area of the battery piece is increased, and the photoelectric conversion efficiency of the solar battery is improved.
The positive electrode fine grid 11 and the negative electrode fine grid 12 extend along the O-Y direction perpendicular to the O-X direction, and the positive electrode fine grid 11 and the negative electrode fine grid 12 are parallel and alternately arranged along the O-X direction. In one embodiment, the positive thin gate 11 and the negative thin gate 12 are intermittent gate lines; in another embodiment, the positive fine grid 11 and the negative fine grid 12 are continuous grid lines; in other embodiments, one of the positive thin gate 11 and the negative thin gate 12 is an intermittent gate line, and the other is a continuous gate line.
The other structure of the back contact battery plate 1 refers to the prior art, and will not be described herein.
In order to reduce the electrical losses and good connection on the solder strip 2, it is preferable to use a flat solder strip 2 with a copper base material width of 0.3mm to 0.6mm and a thickness of 0.1mm to 0.2mm. The matching of the non-main grid back contact battery piece 1 and the thin welding strip 2 ensures that the EVA/EPE/POE with lower gram weight can be used for back packaging, for example, 290g-390g, and the aim of reducing the cost can also be achieved.
In addition, the use of the insulating adhesive block 3 and the conductive adhesive block 4 can fix the solder strip 2 at a low temperature without high-temperature welding, so that the soldering tin layer of the traditional solder strip 2 can be greatly thinned or replaced by other cheap metals or alloys, and the cost can be reduced as long as the copper base material is protected from being oxidized.
Specifically, the solder strip 2 includes a strip-shaped copper substrate and a protective coating layer wrapping the copper substrate to prevent oxidation, and the thickness of the copper substrate is 0.1 mm-0.2 mm, which is the basis of the flat solder strip 2. The protective coating is not used for welding, the thickness of the protective coating can be thinned to 1-25 mu m, and the protective coating can be a tin layer, and can also use cheap tin-lead alloy or tin-lead-bismuth alloy to replace the tin layer so as to reduce the cost.
Specifically, the welding strip 2 includes a positive electrode connection section 21 and a negative electrode connection section 22, where the positive electrode connection section 21 and the negative electrode connection section 22 are respectively connected with the positive electrode fine grid 11 and the negative electrode fine grid 12 of the two adjacent back contact battery pieces 1, so that the adjacent back contact battery pieces 1 are electrically connected in series.
In the first embodiment, referring to fig. 1 to 7, the insulating glue block 3 is used to bond the welding strip 2, and the welding strip 2 is in physical contact with the positive electrode fine grid 11 and the negative electrode fine grid 12 to realize electrical connection, so that high-temperature welding is not needed, the warping phenomenon of the battery piece can be reduced, and the cracking probability in the lamination process is reduced.
The insulating rubber block 3 is formed by curing a colloid material with insulating property, and can be cured at a lower temperature, for example, 100-190 ℃; photo-curable glue, for example 365nm photo-curable glue; both curing modes can avoid the warping phenomenon of the battery piece caused by high temperature. In the present utility model, the insulating adhesive material is preferably a silicone resin, an acrylic resin, an epoxy resin, or the like.
The insulating glue block 3 is disposed at the junction of the positive electrode connection section 21 and the negative electrode fine grid 12 and the junction of the negative electrode connection section 22 and the positive electrode fine grid 11, the positive electrode connection section 21 is in physical contact with the positive electrode fine grid 11, and the negative electrode connection section 22 is in physical contact with the negative electrode fine grid 12.
The electric connection is realized through physical contact, the phenomenon that the battery piece is warped due to the prior high-temperature welding is reduced, and the conductive adhesive block 4 is not needed, so that the material is saved, the cost is reduced, and the hidden trouble that the conductive adhesive block 4 is diffused to the adjacent fine grid to cause the short circuit of the anode and the cathode can be reduced.
The insulating rubber block 3 is equivalent to a bridge pier of the welding belt 2, and plays a role in supporting the welding belt 2. The actual heights of the insulating glue block 3 and the negative electrode insulating glue block 3 are adjusted according to the height of the thin grid line and the printing process conditions. Preferably, the height of the cured insulating glue block 3 is consistent with that of the positive electrode fine grid 11 and the negative electrode fine grid 12, so that good physical contact between the positive electrode connecting section 21 and the positive electrode fine grid 11 and good physical contact between the negative electrode connecting section 22 and the negative electrode fine grid 12 can be ensured.
In the utility model, the heights of the insulating glue block 3, the negative electrode fine grid 12 and the positive electrode fine grid 11 are all 15-30 mu m.
Referring to fig. 1 to fig. 6, in a specific embodiment, the positive thin gate 11 and the negative thin gate 12 are intermittent gate lines, the positive thin gate 11 includes a plurality of positive gate segments 111 arranged at intervals, and a positive blank segment 112 located between adjacent positive gate segments 111, and the negative thin gate 12 includes a plurality of negative gate segments 121 arranged at intervals, and a negative blank segment 122 located between adjacent negative gate segments 121. The positive gate line segment 111 and the negative gate line segment 121 are arranged in a staggered manner along the O-Y direction, that is, the positive blank segment 112 and the negative blank segment 122 are arranged in a staggered manner along the O-Y direction, that is, in the O-X direction, the positive blank segment 112 corresponds to the negative fine gate 12 segment, and the negative blank segment 122 corresponds to the positive fine gate 11 segment.
The insulating glue block 3 is disposed in the positive blank 112 or the negative blank 122, and cannot be printed on the positive gate segment 111 or the negative gate segment 121, which may cause uneven conduction of current and affect electrical performance. Moreover, insulating blocks may be disposed in all the positive blank sections 112 and the negative blank sections 122; it is also possible to provide an insulating block to support the negative electrode connection section 22 only at a portion of the positive electrode blank sections 112 arranged in the O-X direction, and to provide an insulating block to support the positive electrode connection section 21 only at a portion of the negative electrode blank sections 122 arranged in the O-X direction.
In another embodiment, referring to fig. 7, the positive electrode fine grid 11 and the negative electrode fine grid 12 are continuous grid lines, and the insulating glue block 3 is disposed at the junction of all the positive electrode connection sections 21 and the negative electrode fine grid 12 and the junction of the negative electrode connection sections 22 and the positive electrode fine grid 11.
In another embodiment, one of the positive thin gate 11 and the negative thin gate 12 is an intermittent gate line, and the other is a continuous gate line. The joint of the welding strip 2, the positive electrode fine grid 11 and the negative electrode fine grid 12 is electrically connected, the insulating glue block 3 is required to be arranged, and the insulating glue block 3 is not required to be arranged.
For example, the positive thin gate 11 is an intermittent gate line, and the negative thin gate 12 is a continuous gate line. The negative electrode connection section 22 is connected with the positive electrode blank sections 112 of the positive electrode fine grid 11, and the insulating glue blocks 3 are not required to be arranged in each positive electrode blank section 112; and the insulating glue block 3 must be disposed at each junction of the positive electrode connecting section 21 and the negative electrode fine grid 12.
In addition, along the O-Y direction, the width of the insulating glue block 3 is not smaller than the width of the solder strip 2, so that the solder strip 2 can be firmly bonded.
In the second embodiment, please refer to fig. 8, the solder strips 2 are bonded by using the conductive adhesive blocks 4, which is suitable for the back contact battery plate 1 in which the positive thin grid 11 and the negative thin grid 12 are both intermittent grid lines as described in the first embodiment. The welding strip 2 is bonded by adopting a small number of conductive adhesive blocks 4, and the welding strip 2 is in physical contact with other positive electrode fine grids 11 and negative electrode fine grids 12 to realize electric connection, so that high-temperature welding is not needed, and the warping phenomenon of the battery piece can be reduced.
The conductive adhesive block 4 not only can form good mechanical adhesion with the positive electrode fine grid 11 and the negative electrode fine grid 12 to be connected with the electric conduction, but also can form good adhesion with other surfaces of the battery piece, such as a silicon nitride film layer or a silicon material.
The conductive adhesive block 4 comprises 10-50 wt% of resin matrix and 50-90 wt% of conductive filler. The resin matrix plays a role in bonding, and forms a molecular framework structure after solidification, so that the mechanical property and the bonding property are ensured; in the present utility model, the resin matrix is preferably a silicone resin, or an acrylic resin, or an epoxy resin. The conductive filler plays a role in conducting electricity to form a conductive path, and in particular, the conductive filler is preferably silver particles or silver-coated copper particles.
The positive electrode connecting sections 21 cross along the negative electrode blank sections 122, the negative electrode connecting sections 22 cross along the positive electrode blank sections 112, the conductive adhesive blocks 4 are arranged at the cross parts of the positive electrode connecting sections 21 and the positive electrode thin grids 11 and the cross parts of the negative electrode connecting sections 22 and the negative electrode thin grids 12, the number of the conductive adhesive blocks 4 connected with each positive electrode connecting section 21 is smaller than the number of the positive electrode thin grids 11, and the positive electrode connecting sections 21 are in physical contact with other positive electrode thin grids 11; the number of conductive adhesive pieces 4 connected with each negative electrode connection section 22 is smaller than the number of negative electrode fine grids 12, and the negative electrode connection sections 22 are in physical contact with other negative electrode fine grids 12.
In the utility model, the number of the conductive adhesive blocks 4 connected with each positive electrode connecting section 21 is 1/3-2/3 of the number of the positive electrode fine grids 11, the number of the conductive adhesive blocks 4 connected with each negative electrode connecting section 22 is 1/3-2/3 of the number of the negative electrode fine grids 12, a good bonding effect is formed on the welding strip 2, the consumption of the conductive adhesive blocks 4 can be saved to a certain extent, and the shielding area of a solar cell sheet is reduced.
In order to ensure good electrical connection, the conductive paste 4 must be printed at the junction of the positive electrode fine grid 11 and the positive electrode connection section 21 and the junction of the negative electrode fine grid 12 and the negative electrode connection section 22, which are located at the ends along the O-X direction.
Preferably, a plurality of conductive adhesive blocks 4 connected with the same solder strip 2 are uniformly distributed along the O-X direction, and the solder strips 2 are uniformly adhered, so that the solder strips 2 between two adjacent conductive adhesive blocks 4 have good electrical contact with the positive electrode fine grid 11 and the negative electrode fine grid 12.
In addition, along the O-Y direction, the width of the conductive adhesive block 4 is not smaller than the width of the solder strip 2, so that the solder strip 2 is ensured to be in the printing range of the conductive adhesive block 4, and good conductive connection is ensured; meanwhile, the width of the conductive adhesive block 4 is not greater than the lengths of the positive blank section 112 and the negative blank section 122, and when the components of the conductive adhesive block 4 are diffused in the assembly using process, the conductive adhesive block can be effectively prevented from being conducted with adjacent thin grids, so that a short circuit phenomenon cannot occur.
In addition, if the photovoltaic module 100 is a single glass module, the conductive adhesive block 4 and the insulating adhesive block 3 are white, so that the reflectivity of light can be improved, and the module power can be further improved. If the photovoltaic module 100 is a dual-glass module, the conductive adhesive block 4 and the insulating adhesive block 3 are transparent, so that the appearance is attractive, light is easy to penetrate, and the efficiency of the dual-sided battery can be improved.
Referring to fig. 9, the photovoltaic module 100 further includes at least one fixing film 5 located on a side of the solder strip 2 away from the back contact battery piece 1, and fixes the solder strip 2 to prevent the solder strip 2 from being displaced along with the flow of the packaging material during lamination, and part of EVA material flows between the solder strip 2 and the thin grid line, resulting in poor electrical performance of the module. The fixing film 5 has no fluidity or low fluidity, needs to be pre-fixed in the process of being in a string, and can be provided with fixing devices on a serial machine in the form of local heat curing.
Preferably, the fixing films 5 extend along the O-Y direction, and at least two fixing films 5 are used on each back contact battery piece 1 to cover all the solder strips 2.
In summary, in the photovoltaic module 100 of the present utility model, the back contact battery piece 1 is a battery piece without a main grid, so that the silver-aluminum paste printed on the positive and negative main grids and the corresponding electrodes can be saved, and the manufacturing cost of the battery end can be greatly reduced; meanwhile, the shading of the main grid line is reduced, the light receiving area of the battery piece is increased, and the photoelectric conversion efficiency of the solar battery is improved. And, bond and weld the area 2 through insulating glue piece 3, conductive glue piece 4, weld area 2 and anodal fine grid 11, the fine grid 12 physical contact of negative pole and realize electric connection, need not high temperature welding, can reduce battery piece warpage phenomenon, reduce the split probability in the lamination process.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.
Claims (15)
1. A photovoltaic module, comprising:
the metal electrodes on the back of the back contact battery pieces only comprise a plurality of positive thin grids and a plurality of negative thin grids, the positive thin grids and the negative thin grids extend along the O-Y direction perpendicular to the O-X direction, and the positive thin grids and the negative thin grids are parallel and are alternately arranged along the O-X direction;
the welding strips comprise positive electrode connecting sections and negative electrode connecting sections, and the positive electrode connecting sections and the negative electrode connecting sections are respectively and electrically connected with the positive electrode fine grid connection and the negative electrode fine grid connection of two adjacent back contact battery pieces;
the welding strip is adhered to the back contact battery piece through an insulating adhesive block, the insulating adhesive block is arranged at the joint of the positive electrode connecting section and the negative electrode fine grid and at the joint of the negative electrode connecting section and the positive electrode fine grid, the positive electrode connecting section is in physical contact with the positive electrode fine grid, and the negative electrode connecting section is in physical contact with the negative electrode fine grid.
2. The photovoltaic module of claim 1, wherein: the heights of the insulating glue block, the positive pole fine grid and the negative pole fine grid are consistent and are between 15 mu m and 30 mu m.
3. The photovoltaic module of claim 1, wherein: and in the O-Y direction, the width of the insulating adhesive block is not smaller than the width of the welding strip.
4. The photovoltaic module of claim 1, wherein: the positive thin grid comprises a plurality of positive grid segments arranged at intervals and positive blank segments positioned between the adjacent positive grid segments, and the negative thin grid comprises a plurality of negative grid segments arranged at intervals and negative blank segments positioned between the adjacent negative grid segments; the positive blank section and the negative blank section are arranged in a staggered manner along the O-Y direction, and the widths of the positive blank section and the negative blank section are larger than the width of the welding strip;
the positive electrode connecting section is connected with the negative electrode blank section, the negative electrode connecting section is connected with the positive electrode blank section, and the insulating rubber block is arranged in the positive electrode blank section or the negative electrode blank section.
5. The photovoltaic module of claim 4, wherein: all positive blank sections and all negative blank sections are provided with insulating blocks;
or, only the part of the positive electrode blank sections arranged along the O-X direction is provided with an insulating block to support the negative electrode connecting section, and only the part of the negative electrode blank sections arranged along the O-X direction is provided with an insulating block to support the positive electrode connecting section.
6. The photovoltaic module of claim 1, wherein: the positive thin grid and the negative thin grid are continuous grid lines, and the insulating rubber blocks are arranged at the junctions of all the positive connecting sections and the negative thin grid and the junctions of the negative connecting sections and the positive thin grid.
7. The photovoltaic module of claim 1, wherein: the photovoltaic module is a single-glass module, and the insulating rubber block is white;
or, the photovoltaic module is a double-glass module, and the insulating rubber block is transparent.
8. A photovoltaic module, comprising:
the metal electrodes on the back of the back contact battery pieces only comprise a plurality of positive thin grids and a plurality of negative thin grids, the positive thin grids and the negative thin grids extend along the O-Y direction perpendicular to the O-X direction, and the positive thin grids and the negative thin grids are parallel and are alternately arranged along the O-X direction; the positive thin grid comprises a plurality of positive grid segments arranged at intervals and positive blank segments positioned between the adjacent positive grid segments, and the negative thin grid comprises a plurality of negative grid segments arranged at intervals and negative blank segments positioned between the adjacent negative grid segments; the positive blank section and the negative blank section are arranged in a staggered manner along the O-Y direction;
the welding strips comprise positive electrode connecting sections and negative electrode connecting sections, the positive electrode connecting sections and the negative electrode connecting sections are respectively and electrically connected with positive electrode fine grid connection and negative electrode fine grid connection of two adjacent back contact battery pieces, and the widths of the welding strips in the O-Y direction are smaller than the widths of the positive electrode blank sections and the negative electrode blank sections;
the welding strip is adhered to the back contact battery piece through a plurality of conductive adhesive blocks, the conductive adhesive blocks are arranged at the joint of the positive electrode connecting section and the positive electrode fine grid and the joint of the negative electrode connecting section and the negative electrode fine grid, the number of the conductive adhesive blocks connected with each positive electrode connecting section is smaller than that of the positive electrode fine grid, and the positive electrode connecting sections are in physical contact with other positive electrode fine grid lines; the number of the conductive rubber blocks connected with each negative electrode connecting section is smaller than the number of the negative electrode fine grids, and the negative electrode connecting sections are in physical contact with other negative electrode fine grids.
9. The photovoltaic module of claim 8, wherein: the number of the conductive adhesive blocks connected with each positive electrode connecting section is 1/3-2/3 of the number of the positive electrode fine grids, and the number of the conductive adhesive blocks connected with each negative electrode connecting section is 1/3-2/3 of the number of the negative electrode fine grids.
10. The photovoltaic module of claim 9, wherein: and conductive glue blocks are arranged at the junction of the positive electrode fine grid and the positive electrode connecting section and the junction of the negative electrode fine grid and the negative electrode connecting section at the end part of the back contact battery piece along the O-X direction.
11. The photovoltaic module of claim 8, wherein: and a plurality of conductive adhesive blocks connected with the same welding strip are uniformly distributed along the O-X direction.
12. The photovoltaic module of claim 8, wherein: along the O-Y direction, the width of the conductive adhesive block is not smaller than the width of the welding strip, and the width of the conductive adhesive block is not larger than the lengths of the positive blank section and the negative blank section.
13. The photovoltaic module of claim 8, wherein: the photovoltaic module is a single-glass module, and the conductive adhesive block is white;
or, the photovoltaic module is a double-glass module, and the conductive adhesive block is transparent.
14. The photovoltaic module according to any one of claims 1 to 13, characterized in that: the device further comprises at least one fixing film which is positioned on one side of the welding strip, which is away from the back contact battery piece, wherein the fixing film extends along the O-Y direction, and the fixing film covers all the welding strips.
15. The photovoltaic module according to any one of claims 1 to 13, characterized in that: the back contact battery piece is a whole battery or a 1/n slice battery, and n is between 2 and 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223318591.6U CN219371044U (en) | 2022-12-09 | 2022-12-09 | Photovoltaic module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223318591.6U CN219371044U (en) | 2022-12-09 | 2022-12-09 | Photovoltaic module |
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| Publication Number | Publication Date |
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| CN219371044U true CN219371044U (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223318591.6U Active CN219371044U (en) | 2022-12-09 | 2022-12-09 | Photovoltaic module |
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| CN (1) | CN219371044U (en) |
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