CN215451436U - Photovoltaic battery pack string based on back contact lamination technology - Google Patents
Photovoltaic battery pack string based on back contact lamination technology Download PDFInfo
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- CN215451436U CN215451436U CN202121270390.6U CN202121270390U CN215451436U CN 215451436 U CN215451436 U CN 215451436U CN 202121270390 U CN202121270390 U CN 202121270390U CN 215451436 U CN215451436 U CN 215451436U
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- 238000003475 lamination Methods 0.000 title claims abstract description 39
- 238000005516 engineering process Methods 0.000 title claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 104
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 17
- 229910000679 solder Inorganic materials 0.000 claims description 17
- 239000005357 flat glass Substances 0.000 claims description 16
- 239000002313 adhesive film Substances 0.000 claims description 14
- 239000008393 encapsulating agent Substances 0.000 claims 3
- 239000000853 adhesive Substances 0.000 abstract description 16
- 230000001070 adhesive effect Effects 0.000 abstract description 16
- 238000007493 shaping process Methods 0.000 abstract description 9
- 239000003292 glue Substances 0.000 description 6
- 238000003855 Adhesive Lamination Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a photovoltaic battery pack string based on a back contact lamination technology, which comprises a plurality of first battery slices and second battery slices which are alternately arranged, wherein positive and negative electrodes of the first battery slices and the second battery slices are uniformly distributed on the back surfaces of the batteries, the edges of the adjacent first battery slices and the adjacent second battery slices are laminated, the positive and negative electrodes of the adjacent first battery slices and the adjacent second battery slices are welded through a low-temperature welding strip to realize the series connection of the battery slices, and the low-temperature welding strip is positioned on the back surfaces of the batteries and covers the edge lamination parts of the battery slices. The photovoltaic battery pack string is not welded by conductive adhesive, the front side and the back side of the battery do not need to be welded simultaneously, and the shaping and thinning of the round welding wire are not needed, so that the problems existing in the conductive adhesive stitch welding technology and the welding strip shaping technology can be well solved, and the power and the efficiency of the photovoltaic battery pack string reach excellent levels.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic modules, and particularly relates to a photovoltaic cell string based on a back contact lamination technology.
Background
In 2009-2020, the photovoltaic industry has experienced a period of rapid development, and under the promotion of policy support and market demand, photovoltaic becomes the cheapest energy source in the world, and the flat-price internet access is realized in many countries. In the whole industrial chain from silicon materials, silicon wafers, batteries and components to system construction in China, cost and efficiency are continuously reduced and increased in each link through technical innovation, and the effect of photovoltaic power stepping to flat-price internet surfing is remarkable. The photovoltaic module is particularly remarkable in technical innovation, and technologies such as conductive adhesive lamination (or tiling), solder strip reshaping stitch welding (round welding wire stitch welding), plate interconnection, splicing, special-shaped solder strips, multi-main grid, half-piece, double-side and the like are rapidly developed and applied.
Common photovoltaic module welding technologies include conductive adhesive lamination and solder strip shaping stitch welding. The conductive adhesive lamination mode has a plurality of defects, including that the conductive adhesive lamination mode cannot be realized through a conventional welding mode, the conductive adhesive has limited current collecting and transmitting capacity, the conductive adhesive is required to be cut into battery pieces with smaller areas, the battery pieces are cut by laser at high frequency, scribing damage is difficult to avoid, and current mismatching is easy to cause; the conductive adhesive is coated on the main grids at the edges of the cut batteries, and because the number of the batteries connected in series is large, the width of the main grids is narrow, the positioning precision of the battery connection is difficult to control, and the difficulty of single-string process inspection and the difficulty of repairing bad battery strings are large; the circuit connection is realized by adopting the conductive adhesive, the conductive adhesive is easy to age under the conditions of thermal cycle and damp-heat aging, the electric connection and the conductive capability of the conductive adhesive are reduced quickly, and the anti-aging performance is lower than that of the conventional welding technology; after the conductive adhesive is aged, the compatibility of the conductive adhesive and the packaging adhesive film is reduced, so that the problems of yellowing, bubbles and the like are caused, and the aging resistance of the packaging material of the assembly is influenced. The welding strip shaping stitch welding technology also has a plurality of defects: the front and back surfaces of the cell pieces must be welded simultaneously, so that optical utilization cannot be improved to the utmost, although the grid lines are thinned by the multi-main-grid design, the front surface of the cell still can be shielded to a certain extent after a plurality of round welding wires are welded, and part of incident light is lost; the round welding wires between two adjacent batteries are shaped and thinned, so that the overlapping welding of the adjacent batteries can be realized, but the tensile strength of the thinned parts of the welding wires is reduced; in the process of continuous circulation of cold and heat of the component, the welding part material can be repeatedly contracted and expanded, and the problems of fracture, battery fragmentation and the like can easily occur under the action of stress.
Therefore, there is a need to provide a new welding method to achieve better welding effect.
SUMMERY OF THE UTILITY MODEL
(I) technical problems to be solved by the utility model
The technical problem solved by the utility model is as follows: on the premise of not adopting a conductive adhesive welding mode and a welding strip shaping stitch welding technology, the welding of the photovoltaic battery pack string is realized.
(II) the technical scheme adopted by the utility model
The utility model provides a photovoltaic battery group cluster based on back contact lamination technique, photovoltaic battery group cluster includes a plurality of first battery section and the second battery section of arranging in turn, first battery section with the sliced positive and negative electrode of second battery is equallyd divide in the battery back, and is adjacent first battery section with the sliced edge of second battery has the lamination, and is adjacent first battery section with the sliced positive and negative electrode of second battery welds through the low temperature solder strip and welds in order to realize the sliced series connection of each battery, wherein the low temperature solder strip is located the battery back just covers the sliced edge lamination part of battery.
Preferably, the positive and negative electrodes of the first and second cell slices extend along the arrangement direction of the cell slices, and the positive and negative electrodes of the first and second cell slices are staggered along the direction perpendicular to the arrangement direction.
Preferably, the first positive electrode of the first cell slice overlaps with the second negative electrode of the second cell slice in the extension line of the arrangement direction, and the first negative electrode of the first cell slice overlaps with the second positive electrode of the second cell slice in the extension line of the arrangement direction.
Preferably, the number of the low-temperature welding strips is multiple, each low-temperature welding strip covers different groups of positive and negative electrodes of the adjacent first battery slices and the adjacent second battery slices, and the length of each low-temperature welding strip is less than or equal to the sum of the widths of the adjacent first battery slices and the adjacent second battery slices.
Preferably, the lamination portions of the adjacent first battery slices and the second battery slices are fixed by welding.
Preferably, the width of the lamination part of the adjacent first battery slice and the second battery slice ranges from 0.1mm to 0.5 mm.
Preferably, the photovoltaic cell group string further comprises a packaging adhesive film, a front plate glass and a back plate glass, wherein the packaging adhesive film covers the cell front sides and the cell back sides of the first cell slices and the second cell slices, and the packaging adhesive film covers the positive electrodes, the negative electrodes and the low-temperature solder strips on the cell back sides; the front plate glass is arranged on the packaging adhesive film on the side where the front face of the battery is located, and the back plate glass is arranged on the packaging adhesive film on the side where the back face of the battery is located.
(III) advantageous effects
The utility model discloses a photovoltaic battery pack string based on a back contact lamination technology, which has the following technical effects compared with the traditional welding method:
the photovoltaic battery pack string is not welded by conductive adhesive, the front side and the back side of the battery do not need to be welded simultaneously, and the shaping and thinning of the round welding wire are not needed, so that the problems existing in the conductive adhesive stitch welding technology and the welding strip shaping technology can be well solved, and the power and the efficiency of the photovoltaic battery pack string reach excellent levels.
Drawings
Fig. 1 is a front view of a photovoltaic cell string based on back contact lamination technology according to a first embodiment of the present invention;
fig. 2 is a front view of a first battery slice and a second battery slice according to a first embodiment of the utility model;
fig. 3 is a side view of a photovoltaic cell string based on back contact lamination technology according to a first embodiment of the present invention;
fig. 4 is a flowchart of a method for manufacturing a photovoltaic cell string based on a back contact lamination technology according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Before describing in detail the various embodiments of the present application, the technical idea of the present application is first briefly described: because there are more shortcomings in current conducting resin welding mode and plastic stitch welding technique, the application provides a photovoltaic battery pack string based on back contact lamination technique, the photovoltaic battery pack string includes polylith battery section of arranging in proper order, there is the lamination in adjacent two battery sections, every sliced positive negative electrode of battery is equallyd divide and is distributed in the battery back, weld corresponding positive negative electrode at the battery back through low temperature solder strip, in order to realize the series connection of each battery section, this photovoltaic battery pack string does not adopt conducting resin to weld, and need not weld battery front and back simultaneously, and need not carry out round welding wire plastic and weigh thinly, can solve the problem that conducting resin stitch welding technique exists well and the problem that solder strip plastic technique exists, thereby make the power and the efficiency of photovoltaic battery pack string reach splendid level.
Specifically, as shown in fig. 1, the photovoltaic cell string includes a plurality of first cell slices 10 and second cell slices 20 arranged alternately, positive and negative electrodes of the first cell slices 10 and the second cell slices 20 are distributed on the back surfaces of the cells, a lamination portion 40 is present at the edge of each adjacent first cell slice 10 and second cell slice 20, and the positive and negative electrodes of each adjacent first cell slice 10 and second cell slice 20 are welded by a low temperature welding strip 30 to realize the series connection of the cell slices, wherein the low temperature welding strip 30 is located on the back surface of the cell and covers the lamination portion 40 of the cell slice.
Further, as shown in fig. 2, the positive and negative electrodes of the first and second battery slices 10 and 20 extend along the arrangement direction of the battery slices, and the positive and negative electrodes of the first and second battery slices 10 and 20 are alternately arranged along the direction perpendicular to the arrangement direction. Illustratively, the first positive electrode 11 of the first cell slice 10 overlaps with the extension line of the second negative electrode 21 of the second cell slice 20 in the arrangement direction, and the first negative electrode 12 of the first cell slice 10 overlaps with the extension line of the second positive electrode 22 of the second cell slice 20 in the arrangement direction.
Further, as shown in fig. 1 and 3, the number of the low-temperature welding strips 30 is multiple, each low-temperature welding strip 30 covers different sets of positive and negative electrodes of the adjacent first battery slice 10 and the adjacent second battery slice 20, and the length of the low-temperature welding strip 30 is less than or equal to the sum of the widths of the adjacent first battery slice 10 and the adjacent second battery slice 20. Illustratively, 5 first positive electrodes 11 and 5 first negative electrodes 12 are distributed on the back surface of the first battery slice 10, and 5 second positive electrodes 22 and 5 second negative electrodes 21 are distributed on the back surface of the second battery slice 20, wherein the 5 first positive electrodes 11 of the first battery slice 10 are welded with the 5 second negative electrodes 21 of the second battery slice 20 through 5 low-temperature welding strips 30, the 5 first negative electrodes 12 of the first battery slice 10 are covered by the other 5 low-temperature welding strips 30, and a part of the low-temperature welding strips 30 extends out of the edge of the first battery slice 10 to serve as an electrode lead-out wire of the battery pack string. Welding of each battery slice is achieved by welding 5 second positive electrodes 22 of a second battery slice 20 with 5 first negative electrodes 12 of another adjacent first battery slice 10 through a low-temperature welding strip 30 and the like.
Illustratively, the lamination portions of the adjacent first battery slices 10 and the adjacent second battery slices 20 are fixed by welding, so that the connection stability of the battery slices can be enhanced, and the stability of the battery string can be enhanced. Of course in other embodiments, the lamination portions may not be welded.
Furthermore, the width range of the lamination part 40 of the adjacent first battery slice 10 and the second battery slice 20 is 0.1 mm-0.5 mm, so that the size of the photovoltaic battery string can be reduced to a certain extent, excessive shielding on the front side of the battery is avoided, and the power generation efficiency is ensured.
Further, the photovoltaic cell string further comprises a packaging adhesive film, front plate glass and back plate glass, wherein the packaging adhesive film covers the cell front sides and the cell back sides of the first cell slice 10 and the second cell slice 20, and the packaging adhesive film covers the positive electrode, the negative electrode and the low-temperature solder strip on the cell back sides; the front plate glass is arranged on the packaging adhesive film on the side where the front face of the battery is located, and the back plate glass is arranged on the packaging adhesive film on the side where the back face of the battery is located, so that an integrated photovoltaic battery pack string structure can be formed.
Further, as shown in fig. 4, the second embodiment also discloses a method for preparing a photovoltaic cell string based on a back contact lamination technology, which includes the following steps:
step S10: sequentially and alternately arranging a plurality of first battery slices 10 and second battery slices 20, and laminating the edges of the adjacent first battery slices 10 and second battery slices 20, wherein the positive and negative electrodes of the first battery slices 10 and the second battery slices 20 are uniformly distributed on the back surfaces of the batteries;
step S20: and welding the positive and negative electrodes of the adjacent first battery slices 10 and the second battery slices 20 by using a low-temperature welding strip 30 to realize series connection of the battery slices, wherein the low-temperature welding strip 30 is positioned on the back surface of the battery and covers the edge lamination part 40 of the battery slices.
Further, step S20 includes the following steps:
step S21: placing low-temperature welding strips on the positive electrodes and the negative electrodes to be welded, wherein each low-temperature welding strip covers a group of positive electrodes and negative electrodes of the first battery slices and the second battery slices which are adjacent to each other;
step S22: and pressing and heating the low-temperature welding strip by using infrared welding equipment, so that the positive electrode and the negative electrode to be welded are welded, and the serial connection of each battery slice is realized.
Further, the preparation method of the second embodiment further includes the following steps:
step S30: coating packaging glue on the front sides and the back sides of the first battery slices and the second battery slices to form packaging glue films, wherein the packaging glue film on the side of the back side of the battery covers the positive electrode, the negative electrode and the welding strip;
step S40: and respectively attaching front plate glass and back plate glass to the packaging adhesive films on the front side and the back side of the battery, and heating by using a laminating heating mode to form an integrated battery structure.
Specifically, to describe the soldering process of the photovoltaic cell string in more detail, a plurality of first cell slices and second cell slices are taken as an example and further described below.
The method comprises the following steps: the back contact battery is scribed through nondestructive laser scribing equipment, the sliced battery with two electrode patterns can be automatically formed after scribing, namely a first battery slice 10 and a second battery slice 20, and the size of the sliced battery can be adjusted according to circuit design.
Step two: the first battery slices 10 and the second battery slices 20 are placed on a feeding table of series welding equipment, the series welding equipment arranges the first battery slices 10 and the second battery slices 20 on a conveyor belt at intervals and continuously, the back electrodes face upwards, and the second battery slices 20 rotate by 180 degrees when the first battery slices 10 and the second battery slices 20 are arranged, so that the positive and negative electrodes of each first battery slice 10 and each second battery slice 20 which are sequentially connected are aligned, namely the first negative electrode of the first battery slice 10 corresponds to the second positive electrode of the second battery slice 20, and the first positive electrode of the first battery slice 10 corresponds to the second negative electrode of the second battery slice 20.
Step three: the first battery slice 10 and the second battery slice 20 are continuously conveyed to a pre-welding position at intervals, and are slightly overlapped at the pre-welding position, wherein the overlapping width range is 0.1-0.5 mm.
Step four: and welding a head end welding strip, namely placing the automatically cut low-temperature welding strip on the first positive electrode on one side of the first battery slice 10, wherein the quantity of the placed low-temperature welding strips 30 is 1/2 of the quantity of the main grid lines. The length of the low temperature solder strip can cover the first positive electrode of the first battery section 10, but the low temperature solder strip does not extend beyond the edge of the first battery section 10 and contact the second battery section 20 in the direction of the second battery section 20. The low-temperature welding strip in the direction opposite to the second battery section 20 extends beyond the first battery section 10, and a certain length is reserved for the confluence leading-out of the positive electrode.
Step five: and the second low-temperature welding strip is connected, the automatically cut low-temperature welding strips are placed on the first negative electrode of the first battery slice 10 and the second positive electrode of the second battery slice 20 at the same side, the number of the placed low-temperature welding strips is 1/2 (the number of the main grid lines is the same in the following process and is not repeated), and the length of the low-temperature welding strips can cover the first negative electrode of the first battery slice 10 and the second positive electrode of the second battery slice 20 but does not exceed the first battery slice 10 and the second battery slice 20.
Step six: and a third low-temperature welding strip is connected, the automatically cut low-temperature welding strips are placed on the second negative electrode of the second battery slice 20 and the first positive electrode of the second first battery slice 10 on the same side, and the length of the low-temperature welding strip can cover the second negative electrode of the second battery slice 20 and the first positive electrode of the next first battery slice 10 and does not exceed the second negative electrode of the second battery slice 20 and the second first battery slice 10.
Step seven: and the fourth low-temperature welding strip is connected, the automatically cut low-temperature welding strip is placed on the first negative electrode of the second first battery slice 10 and the second positive electrode of the second battery slice 20 at the same side, the length of the low-temperature welding strip can cover the first negative electrode of the second first battery slice 10 and the second positive electrode of the second battery slice 20, and the lengths of the low-temperature welding strip do not exceed the length of the second first battery slice 10 and the length of the second positive electrode of the second battery slice 20.
Step eight: and a fifth low-temperature welding strip is connected, the automatically cut low-temperature welding strip is placed on the second negative electrode of the second battery slice 20 and the first positive electrode of the third first battery slice 10 on the same side, the length of the low-temperature welding strip can cover the second negative electrode of the second battery slice 20 and the first positive electrode of the third first battery slice 10, and the lengths of the low-temperature welding strip do not exceed the second battery slice 20 and the third first battery slice 10.
Step nine: the operation is repeated, the first battery slices 10 and the second battery slices 20 are overlapped by 0.1-0.5 mm, the arranged battery pack and the low-temperature welding strip are automatically transmitted to a welding position, the low-temperature welding strip is pressed down and heated through infrared welding equipment, and the first battery slices 10 and the second battery slices 20 are connected through the low-temperature welding strip.
Step ten: welding a group of battery slices with the number of N, and leading out the low-temperature welding strip from the negative electrode of the last first battery slice 10 if N is an odd number; if the number of the welding strips is even, the low-temperature welding strip is led out from the negative electrode of the last second battery slice 20.
Step eleven: the welded photovoltaic battery pack strings are sequentially arranged and connected in a converging manner according to a circuit structure, packaging glue with good flowability is laid on the front side and the back side of each battery of the battery slices respectively to form packaging glue films, and each battery slice, each packaging glue film, each front plate glass and each back plate glass form an integral structure in a laminating, heating and pressurizing manner.
By the welding method, the series stitch welding technology of the back contact battery is realized, the front side is not shielded by a low-temperature welding strip, the overlapped part is not electrically connected by conductive adhesive, and the overlapped part is not subjected to mechanical shaping.
In the second embodiment, a multi-main-gate back-contact battery is adopted, the number of gate lines can cover 4BB (8 main gate), 6BB (12 main gate), … … 12BB (24 main gate), and the like, and the number of slices can be 2 min, 3 min, 4 min, 5 min, and the like according to requirements.
The preparation method of the photovoltaic battery string based on the back contact lamination technology disclosed by the second embodiment has the following advantages: the purpose of high-density packaging of the lamination can be achieved by the assembly without using conductive adhesive; the lamination technology is combined with the back contact low-temperature welding technology, so that the front side of the battery is almost free from shielding, the optical gain and the power density can be improved to the utmost, and meanwhile, the low-temperature welding technology can reduce the welding stress and reduce the electrical loss; the conventional bipartite technology can be adopted, the welding process of welding equipment does not need to be adjusted, and the high-density welding of the lamination can be realized without additionally arranging a welding strip shaping device (flattening welding wires); the single cell multi-segmentation technology can be adopted, but the conductive adhesive is not needed, so that the flexible arrangement of the laminated circuit structure is realized, and the production line equipment is not needed to be modified; the back contact battery can realize negative pitch interconnection, the sizes of different components are reduced by at least 20mm, and the component efficiency is improved by more than 0.2%; on the basis of the existing back contact lamination welding, the current collection capacity is further improved and the power efficiency of the assembly is improved by optimizing the screen plate graph of the back battery, upgrading the multi-grid technology and adopting circular or thin welding strips and the like.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the claims and their equivalents, and that such changes and modifications are intended to be within the scope of the utility model.
Claims (7)
1. The utility model provides a photovoltaic battery group cluster based on back contact lamination technique, its characterized in that, photovoltaic battery group cluster includes a plurality of first battery section and the second battery section of arranging in turn, first battery section with the sliced positive and negative electrode of second battery is equallyd divide and is distributed in the battery back, and is adjacent first battery section with there is the lamination in the sliced edge of second battery, and is adjacent first battery section with the sliced positive and negative electrode of second battery welds in order to realize the sliced series connection of each battery through the low temperature solder strip, wherein the low temperature solder strip is located the battery back just covers the sliced edge lamination part of battery.
2. The string of photovoltaic cells based on back contact lamination technology according to claim 1, wherein the positive and negative electrodes of the first and second cut cells extend along the direction of arrangement of the cut cells, and the positive and negative electrodes of the first and second cut cells are staggered along the direction perpendicular to the direction of arrangement.
3. The back contact lamination technology-based photovoltaic cell string according to claim 2, wherein the first positive electrode of the first cell slice overlaps with the second negative electrode of the second cell slice in extension of the arrangement direction, and the first negative electrode of the first cell slice overlaps with the second positive electrode of the second cell slice in extension of the arrangement direction.
4. The string of photovoltaic cells based on back contact lamination technology according to claim 3, wherein the number of the low temperature solder strips is multiple, each low temperature solder strip covers different sets of positive and negative electrodes of the adjacent first cell slice and the second cell slice, and the length of the low temperature solder strip is less than or equal to the sum of the widths of the adjacent first cell slice and the adjacent second cell slice.
5. The string of photovoltaic cells based on back contact lamination technology according to claim 1, wherein the lamination portions of the adjacent first and second slices of cells are fixed by welding.
6. The string of photovoltaic cells based on back contact lamination technology according to claim 1, wherein the width of the lamination portion of the adjacent first and second slices of cells ranges from 0.1mm to 0.5 mm.
7. The back contact lamination technology-based photovoltaic cell string according to claim 2, further comprising an encapsulant film, a front plate glass and a back plate glass, wherein the encapsulant film covers the cell front sides and the cell back sides of the first cell slice and the second cell slice, and the encapsulant film covers the positive electrodes, the negative electrodes and the low temperature solder strips on the cell back sides; the front plate glass is arranged on the packaging adhesive film on the side where the front face of the battery is located, and the back plate glass is arranged on the packaging adhesive film on the side where the back face of the battery is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121270390.6U CN215451436U (en) | 2021-06-07 | 2021-06-07 | Photovoltaic battery pack string based on back contact lamination technology |
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| CN202121270390.6U CN215451436U (en) | 2021-06-07 | 2021-06-07 | Photovoltaic battery pack string based on back contact lamination technology |
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| CN215451436U true CN215451436U (en) | 2022-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114864724A (en) * | 2022-07-06 | 2022-08-05 | 一道新能源科技(衢州)有限公司 | Photovoltaic laminated tile assembly for preventing series disconnection of batteries |
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2021
- 2021-06-07 CN CN202121270390.6U patent/CN215451436U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114864724A (en) * | 2022-07-06 | 2022-08-05 | 一道新能源科技(衢州)有限公司 | Photovoltaic laminated tile assembly for preventing series disconnection of batteries |
| CN114864724B (en) * | 2022-07-06 | 2022-09-20 | 一道新能源科技(衢州)有限公司 | Photovoltaic laminated tile assembly for preventing batteries from being connected in series and broken |
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Effective date of registration: 20240129 Address after: 810008 No. 43, Wusi West Road, Chengxi District, Xining City, Qinghai Province Patentee after: QINGHAI HUANGHE HYDROPOWER DEVELOPMENT Co.,Ltd. Country or region after: China Address before: 810007 No. 4, Jinsi Road, Dongchuan Industrial Park, Xining City, Qinghai Province Patentee before: Xining solar power branch of Qinghai upper Yellow River Hydropower Development Co.,Ltd. Country or region before: China Patentee before: Xi'an solar power branch of Qinghai upper Yellow River Hydropower Development Co.,Ltd. Patentee before: HUANGHE HYDROPOWER DEVELOPMENT Co.,Ltd. Patentee before: QINGHAI HUANGHE HYDROPOWER DEVELOPMENT Co.,Ltd. |