CN211858664U - Laminated tile assembly and solar cell - Google Patents
Laminated tile assembly and solar cell Download PDFInfo
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- CN211858664U CN211858664U CN202020127445.7U CN202020127445U CN211858664U CN 211858664 U CN211858664 U CN 211858664U CN 202020127445 U CN202020127445 U CN 202020127445U CN 211858664 U CN211858664 U CN 211858664U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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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- Photovoltaic Devices (AREA)
Abstract
The utility model relates to a fold tile subassembly, solar wafer. The shingle assembly comprises a plurality of solar cells, the positive electrode of one of any two adjacent solar cells is in direct contact with the back electrode or back electric field of the other solar cell to achieve conductive connection, and each solar cell has magnetic structures on the top and bottom surfaces thereof, and the magnetic structures are configured such that the magnetic structures on the opposing surfaces of any two adjacent solar cells can magnetically attract when the positive and back electrodes of the two solar cells are in contact to secure the two adjacent solar cells relative to each other. According to the utility model discloses, after solar wafer arranged and formed the shingle assembly, the electricity between the solar wafer is connected and is realized through positive electrode and back electrode or the direct contact of back of the body electric field each other, and adsorbs together through magnetic structure between the solar wafer, and need not additionally set up the binder.
Description
Technical Field
The utility model relates to an energy field especially relates to a stack tile subassembly and solar wafer.
Background
With the increasing consumption of conventional fossil energy such as global coal, oil, natural gas and the like, the ecological environment is continuously deteriorated, and particularly, the sustainable development of the human society is seriously threatened due to the increasingly severe global climate change caused by the emission of greenhouse gases. Various countries in the world make respective energy development strategies to deal with the limitation of conventional fossil energy resources and the environmental problems caused by development and utilization. Solar energy has become one of the most important renewable energy sources by virtue of the characteristics of reliability, safety, universality, long service life, environmental protection and resource sufficiency, and is expected to become a main pillar of global power supply in the future.
In a new energy revolution process, the photovoltaic industry in China has grown into a strategic emerging industry with international competitive advantages. However, the development of the photovoltaic industry still faces many problems and challenges, and the conversion efficiency and reliability are the biggest technical obstacles restricting the development of the photovoltaic industry, while the cost control and the scale-up are economically restricted. The photovoltaic module is taken as a core component of photovoltaic power generation, and the development of high-efficiency modules by improving the conversion efficiency of the photovoltaic module is a necessary trend. Various high efficiency modules, such as shingles, half-sheets, multi-master grids, double-sided modules, etc., are currently emerging on the market. With the application places and application areas of the photovoltaic module becoming more and more extensive, the reliability requirement of the photovoltaic module becomes higher and higher, and particularly, the photovoltaic module with high efficiency and high reliability needs to be adopted in some severe or extreme weather frequent areas.
Under the background of vigorous popularization and use of green solar energy, the shingled assembly utilizes the electrical principle of low current and low loss (the power loss of the photovoltaic assembly is in direct proportion to the square of working current) so as to greatly reduce the power loss of the assembly. And secondly, the inter-cell distance region in the cell module is fully utilized to generate electricity, so that the energy density in unit area is high. In addition, the conventional photovoltaic metal welding strip for the assembly is replaced by the conductive adhesive with the elastomer characteristic at present, the photovoltaic metal welding strip shows higher series resistance in the whole battery, and the stroke of a current loop of the conductive adhesive is far smaller than that of a welding strip, so that the laminated assembly becomes a high-efficiency assembly, and meanwhile, the outdoor application reliability is more excellent than that of the conventional photovoltaic assembly, and the laminated assembly avoids stress damage of the metal welding strip to the interconnection position of the battery and other confluence areas. Especially, under the dynamic (load action of natural world such as wind, snow and the like) environment with alternating high and low temperatures, the failure probability of the conventional assembly which is interconnected and packaged by adopting the metal welding strips is far higher than that of the laminated assembly which is interconnected and cut by adopting the conductive adhesive of the elastomer and packaged by the crystalline silicon battery small pieces.
The mainstream technology of the current tile stack assembly is to use a conductive adhesive to interconnect the cut battery pieces, wherein the conductive adhesive mainly comprises a conductive phase and a bonding phase. The conductive phase mainly comprises precious metals, such as pure silver particles or particles of silver-coated copper, silver-coated nickel, silver-coated glass and the like, and is used for conducting electricity among solar cells, the particle shape and distribution of the conductive phase are based on the requirement of optimal electricity conduction, and at present, more sheet-shaped or sphere-like combined silver powder with D50 being less than 10um is adopted. The adhesive phase is mainly composed of a high molecular resin polymer having weather resistance, and acrylic resin, silicone resin, epoxy resin, polyurethane, and the like are usually selected in accordance with the adhesive strength and weather resistance. In order to enable the conductive adhesive to achieve low contact resistance, low volume resistivity and high adhesion and maintain long-term excellent weather resistance, a conductive adhesive manufacturer can generally complete the design of a conductive phase and an adhesive phase formula, so that the performance stability of the laminated tile assembly under an initial stage environment corrosion test and long-term outdoor practical application is ensured.
And after being packaged, the battery assembly connected by the conductive adhesive is subjected to environmental erosion in outdoor practical use, for example, high and low temperature alternating expansion and contraction with heat generates relative displacement between the conductive adhesives. The most serious reason is that the current is connected in a virtual way or even disconnected, and the main reason is generally that the materials are combined and then are weak in mutual connection capacity. The weak connection capability mainly shows that a process operation window is needed for the operation of the conductive adhesive in the manufacturing process, and the window is relatively narrow in the actual production process and is very easily influenced by environmental factors, such as the temperature and humidity of an operation place, the time for which the conductive adhesive stays in the air after being coated and the like, so that the conductive adhesive loses activity. Meanwhile, the phenomenon of uneven sizing and missing easily occurs under the conditions of glue dispensing, glue spraying or printing process due to the characteristic change of glue, and great hidden danger is caused to the reliability of products. And the conductive adhesive mainly comprises high polymer resin and a large amount of noble metal powder, so that the cost is high, and the ecological environment is damaged to a certain extent (the production and processing of noble metals have great pollution to the environment). Moreover, the conductive adhesive belongs to a paste, has certain fluidity in the process of gluing or laminating, and is very easy to overflow to cause short circuit of the positive electrode and the negative electrode of the laminated interconnected battery string.
That is to say, for most of the laminated assemblies made by adopting the conductive adhesive bonding mode, the characteristics of weak mutual connection strength exist, the requirement of the manufacturing process on the environment is high, the glue overflow and short circuit are easy to occur in the process, the use cost is high, the production efficiency is low, and the like.
In order to solve the above problems, there are some laminated assemblies that choose to fix the individual solar cells to each other with a non-conductive adhesive. However, such a solution still needs to introduce a viscous substance, and the step of applying an adhesive still exists in the preparation process, so that the production cost is high and the production processing process is complicated. And the tack of the adhesive may gradually decrease over long-term outdoor use, the weatherability of the shingle assembly may be compromised.
There is thus a need to provide a stack module and a solar cell to at least partially solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stack tile subassembly and solar wafer for after solar wafer arranges and forms the stack tile subassembly, the electricity between the solar wafer is connected and is realized through the direct contact of positive electrode and back electrode or back of the body electric field each other, and adsorbs together through magnetic structure between the solar wafer, and need not additionally set up the binder.
According to an aspect of the present invention, there is provided a laminated assembly comprising a plurality of solar cells arranged in sequence in a first direction in a laminated manner, wherein the solar cells comprise a substrate sheet, a positive electrode extending in a second direction is disposed on a top surface of the substrate sheet, a back electrode extending in a third direction parallel to the second direction is disposed on a bottom surface of the substrate sheet, the positive electrode and the back electrode have a space in the first direction,
the positive electrode of any two adjacent solar cell pieces is in direct contact with the back electrode or back electric field of the other solar cell piece to realize conductive connection,
wherein each of the solar cells has magnetic structures on a top surface and a bottom surface thereof, and the magnetic structures are configured such that the magnetic structures on the opposing surfaces of any two adjacent solar cells can magnetically attract when the positive and back electrodes of the two solar cells are in contact to fix the two solar cells relative to each other.
In one embodiment, the magnetic structure is the positive electrode and the back electrode on the solar cell, and the positive electrode and the back electrode are magnetic conductive strip-shaped structures or dot-shaped structures.
In one embodiment, the magnetic structure is independent of the positive electrode and the back electrode.
In one embodiment, the positive electrode and/or the back electrode are arranged intermittently in the direction of extension thereof, the positive electrode and the back electrode being at least partially aligned in the first direction.
In one embodiment, the positive electrode is intermittently disposed in the second direction and the back electrode is continuously disposed in the third direction; or
The positive electrode is continuously arranged in the second direction, and the back electrode is discontinuously arranged in the third direction; or
The positive electrodes are intermittently arranged in the second direction, the back electrodes are intermittently arranged in the third direction, and the positive electrodes and the back electrodes are aligned in the first direction.
In one embodiment, the magnetic structure is independent of the positive electrode and the back electrode, and,
the positive electrode, the back electrode and the magnetic structures are all formed into a plurality of short strip-shaped structures which are arranged in sequence and discontinuously in the extending direction of the positive electrode, the back electrode and the magnetic structures on the top surface are arranged alternately in the second direction, the back electrode and the magnetic structures on the bottom surface are arranged alternately in the third direction, and the positive electrode and the back electrode are aligned in the first direction.
In one embodiment, the positive electrode and the back electrode are each formed in a zigzag structure, and when two solar cells are connected in a shingled manner, the positive electrode and the back electrode of the two solar cells are in contact with each other in a rack-and-pinion manner.
In one embodiment, the magnetic structure is a neodymium iron boron magnet strip structure, a samarium cobalt magnet strip structure, an alnico magnet strip structure, or a ferrite magnet strip structure, and the magnetic structure is close to the back electrode or the positive electrode.
In one embodiment, the magnetic structure is a stripe structure, and for each solar cell, the magnetic structure on the top surface is adjacent to the positive electrode and extends along a direction parallel to the second direction; the magnetic structure on the bottom surface is proximate to the back electrode and extends in a direction parallel to the third direction.
In one embodiment, the stack assembly is provided without an adhesive.
According to another aspect of the present invention, there is provided a solar cell sheet, a plurality of the solar cell sheets can be sequentially connected in a shingled manner in a first direction, the solar cell sheet includes a substrate sheet, a positive electrode extending in a second direction is provided on a top surface of the substrate sheet, a back electrode extending in a third direction parallel to the second direction is provided on a bottom surface of the substrate sheet, the solar cell sheet is configured such that when two of the solar cell sheets are connected in the shingled manner in the first direction, the positive electrode of one of the two solar cell sheets can directly contact with the back electrode of the other to realize an electrically conductive connection,
and, the solar cell sheets have magnetic structures on top and bottom surfaces thereof, the magnetic structures being configured such that the magnetic structures on opposing surfaces of any two adjacent solar cell sheets can magnetically attract when the positive and back electrodes of the two solar cell sheets are in contact to fix the two adjacent solar cell sheets relative to each other.
In one embodiment, the magnetic structure is the positive electrode and the back electrode on the solar cell, and the positive electrode and the back electrode are magnetic conductive strip-shaped structures or dot-shaped structures.
In one embodiment, the magnetic structure is independent of the positive electrode and the back electrode.
In one embodiment, the positive electrode and/or the back electrode are arranged intermittently in the direction of extension thereof, the positive electrode and the back electrode being at least partially aligned in the first direction.
In one embodiment, the positive electrode is intermittently disposed in the second direction and the back electrode is continuously disposed in the third direction; or
The positive electrode is continuously arranged in the second direction, and the back electrode is discontinuously arranged in the third direction; or
The positive electrodes are intermittently arranged in the second direction, the back electrodes are intermittently arranged in the third direction, and the positive electrodes and the back electrodes are aligned in the first direction.
In one embodiment, the magnetic structure is independent of the positive electrode and the back electrode, and,
the positive electrode, the back electrode and the magnetic structure respectively comprise a plurality of short strip-shaped structures which are sequentially arranged in the extending direction of the positive electrode, the magnetic structures on the top surface and the positive electrode are alternately arranged in the second direction, the magnetic structures on the back electrode and the bottom surface are alternately arranged in the third direction, and the positive electrode and the back electrode are aligned in the first direction.
In one embodiment, the positive electrode and the back electrode are each formed in a zigzag structure, and when two solar cells are connected in a shingled manner, the positive electrode and the back electrode of the two solar cells are in contact with each other in a rack-and-pinion manner.
In one embodiment, the magnetic structure is a stripe structure or a dot structure formed by a neodymium iron boron magnet, a samarium cobalt magnet, an alnico magnet, or a ferrite magnet, and the magnetic structure is close to the back electrode or the positive electrode.
In one embodiment, the magnetic structure is a stripe structure, and the magnetic structure on the top surface is adjacent to the positive electrode and extends along a direction parallel to the second direction; the magnetic structure on the bottom surface is proximate to the back electrode and extends in a direction parallel to the third direction.
According to the utility model discloses, after solar wafer arranged and formed the shingle assembly, the electricity between the solar wafer is connected and is realized through positive electrode and back electrode or the direct contact of back of the body electric field each other, and adsorbs together through magnetic structure between the solar wafer, and need not additionally set up the binder. Such a structure can simplify the production process flow and can avoid the occurrence of problems that may be caused by the failure of the adhesive.
Drawings
For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals in the drawings refer to like parts. It will be appreciated by persons skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention without any limiting effect on the scope of the invention, and that the various components in the drawings are not to scale.
Fig. 1 is a schematic view of a solar cell sheet according to a preferred embodiment of the present invention;
FIG. 2 is a shingle assembly formed by stacking the solar cells of FIG. 1;
3-8 are schematic diagrams of several alternatives to the solar cell sheet shown in FIG. 1;
fig. 9-11 are schematic views of several situations that may occur, taken along line a-a in fig. 2.
Detailed Description
Referring now to the drawings, specific embodiments of the present invention will be described in detail. What has been described herein is merely a preferred embodiment in accordance with the present invention, and those skilled in the art will appreciate that other ways of implementing the present invention on the basis of the preferred embodiment will also fall within the scope of the present invention.
The utility model provides a fold tile subassembly and solar wafer, fig. 1 to 11 show a plurality of preferred embodiments of the utility model.
Fig. 1 shows a solar cell 1 according to a preferred embodiment of the present invention, and fig. 2 shows a plurality of laminated modules 2 in which the solar cells 1 in fig. 1 are arranged in a laminated manner. It should be noted that the "first direction" to be mentioned later may be understood as an arrangement direction of each solar cell sheet 1 in the shingle assembly 2, which is substantially consistent with a width direction of each substantially rectangular solar cell sheet 1, and the first direction is shown by D1 in fig. 2; the "second direction" may be understood as one length direction on the top surface 24 of the rectangular solar cell sheet 1, the second direction being shown by D2 in fig. 3; the "third direction" may be understood as one length direction on the bottom surface 25 of the rectangular solar cell sheet 1, the third direction being shown by D3 in fig. 3.
Continuing with reference to fig. 1. The solar cell sheet 1 includes a base sheet 11, and the base sheet 11 is preferably made of silicon. The surface of the base sheet 11 is printed with a plurality of electrodes, preferably made of silver. Specifically, the top surface 24 of the base sheet 11 is printed with the positive electrode 13 extending in the second direction D2, and the bottom surface 25 of the base sheet 11 is provided with the back electrode 12 printed in the third direction D3 parallel to the second direction D2. When the solar cells 1 are connected in a shingled manner, the positive electrode 13 of one of any two adjacent solar cells 1 can be electrically connected by being in direct physical contact with the back electrode 12 or the back electric field 14 of the other.
As shown in fig. 1, 3 to 5, the positive electrode 13 and the back electrode 12 are spaced in the first direction D1. When the two solar cells 1 are connected in a shingled manner in the first direction D1, the positive electrode 13 of one of the two solar cells 1 can be aligned with and contact the back electrode 12 of the other. It will be appreciated that in fig. 1, the top surface 24 of the solar cell sheet 1 is shown, and thus the back electrode 12 should be disposed on the bottom surface 25 opposite the location where it is directed.
For ease of production and assembly, the solar cell sheet 1 may be machined so that its top surface 24 and bottom surface 25 are rectangular. The positive electrode 13 and the back electrode 12 are disposed on opposite edges of the top surface 24 and the bottom surface 25, respectively. For example, the positive electrode 13 and the back electrode 12 may be disposed on longitudinal edges of the top surface 24 and the bottom surface 25, respectively. Such an arrangement can avoid large-area overlapping between the solar cells 1, thereby increasing the exposed area of the stack 2. Also, the first direction D1 may be a direction parallel to the lateral edges of the top and bottom surfaces 24, 25, that is, the first direction D1 is perpendicular to the second and third directions D2, D3.
In order to save manufacturing materials for the electrodes without affecting the conductivity between the solar cells 1, the positive electrode 13 and/or the back electrode 12 may be disposed intermittently along the extending direction thereof, so that the total disposed length of the positive electrode 13 and the back electrode 12 is not necessarily equal. Meanwhile, in order to enable the contact between the positive electrode 13 and the back electrode 12, the solar cell sheet 1 is further arranged such that the positive electrode and the back electrode are at least partially aligned in the first direction D1. For example, as shown in fig. 3, the positive electrode 13 is intermittently disposed in the second direction D2 on the top surface 24, the back electrode 12 is intermittently disposed in the third direction D3 on the bottom surface 25, and the respective sections of the positive electrode 13 and the back electrode 12 are aligned in the first direction D1; alternatively, as shown in fig. 4, the positive electrodes 13 are intermittently disposed on the top surface 24 in the second direction D2, and the back electrodes 12 are continuously disposed on the bottom surface 25 in the third direction D3; alternatively, as shown in fig. 5, the positive electrodes 13 are continuously disposed on the top surface 24 in the second direction D2, and the back electrodes 12 are intermittently disposed on the bottom surface 25 in the third direction D3.
Alternatively, in order to achieve efficient conduction, the positive electrode 13 may be continuously disposed in the second direction D2, the back electrode 12 may be continuously disposed in the third direction D3, and the contact area between the positive electrode 13 and the back electrode 12 is as large as possible, so that the current conduction efficiency is high.
In order to further increase the contact area between the positive electrode 13 and the back electrode 12 of the adjacent solar cell sheets 1, the positive electrode 13 and the back electrode 12 may be arranged in a zigzag structure, so that when the adjacent solar cell sheets 1 are joined, the positive electrode 13 and the back electrode 12 are in contact with each other in a rack meshing manner. Such an arrangement can not only increase the contact area between the positive electrode 13 and the back electrode 12, but also improve the stability of interconnection between the solar cells 1.
Meanwhile, the solar cell pieces 1 are provided with magnetic structures, and the plurality of solar cell pieces 1 are adsorbed together through the magnetic structures, so that the shingle assembly 2 provided by the utility model can be formed. The tile stack assembly 2 may be fixed to each other only by the magnetic structure without any adhesive such as conductive adhesive.
In particular, the magnetic structure may have various implementations. For example, in the schemes shown in fig. 1, fig. 3-fig. 5, and fig. 9, the positive electrode 13 and the back electrode 12 of the solar cell sheet 1 may be made of silver paste doped with magnetic material, so that the positive electrode 13 and the back electrode 12 can be used as magnetic structures. When the positive electrode 13 and the back electrode 12 on the surfaces facing each other of any two adjacent solar cells 1 are aligned, the magnetic force between the positive electrode 13 and the back electrode 12 will attract the two together, and the positive electrode 13 and the back electrode 12 are in direct contact, thereby achieving the conductive connection on one hand and the fixation of the two adjacent solar cells 1 relative to each other on the other hand.
It will be appreciated that, since the positive electrode 13 and the back electrode 12 have magnetic properties, when they are brought close to each other, the magnetic force will automatically bring them close to each other until they just touch each other, and this process can be achieved without the need to manually align the positive electrode 13 and the back electrode 12. Thus, the mutual magnetic action of the positive electrode 13 and the back electrode 12 of the adjacent solar cell pieces 1 simultaneously provides a guiding effect, so that the simultaneous use of the positive electrode 13 and the back electrode 12 as a magnetic structure can also improve the production efficiency.
Alternatively, the magnetic structure may be provided separately from the positive electrode 13 and the back electrode 12. Such a scheme is shown in fig. 6-8, 10-11.
In the scheme shown in fig. 6, the positive electrode 13, the back electrode 12, the top surface magnetic structure 31 and the bottom surface magnetic structure 32 are all formed into a plurality of short strip-shaped structures which are arranged intermittently in sequence in the respective extending directions, the length of each section of the positive electrode 13 is just matched with the interval between two adjacent sections of the top surface magnetic structures 31, the length of each section of the back electrode 12 is just matched with the interval between two adjacent sections of the bottom surface magnetic structures 32, so that the positive electrode 13 and the top surface magnetic structures 31 are alternately arranged in the second direction, the back electrode 12 and the magnetic structures on the bottom surface are alternately arranged in the third direction, and the positive electrode 13 and the back electrode 12 are aligned in the first direction.
In this way, when the positive electrode 13 and the back electrode 12 of two adjacent solar cells 1 are in conductive contact, the top surface magnetic structure 31 and the bottom surface magnetic structure 32 of the pair of adjacent solar cells 1 are also just attracted together by magnetic force, so as to simultaneously realize the conductive connection between the two solar cells 1 and the fixation relative to each other.
Fig. 7 shows a scheme in which top surface magnetic structure 31 'is independent of positive electrode 13' and top surface magnetic structure 31 'does not extend in line with positive electrode 13', bottom surface magnetic structure 32 'is independent of back electrode 12' and bottom surface magnetic structure 32 'does not extend in line with back electrode 12'. Specifically, the positive electrode 13 'is disposed along the longitudinal edge of the solar cell sheet 1, and the top surface magnetic structure 31' is adjacent to the positive electrode 13 'and extends parallel to the positive electrode 13'; correspondingly, the bottom surface magnetic structure 32 ' is disposed along the other longitudinal edge of the solar cell sheet 1, and the back electrode 12 ' extends next to the bottom surface magnetic structure 32 ', and the extending directions of the back electrode 12 ' and the bottom surface magnetic structure 32 ' are also parallel to each other.
A schematic view of a shingle assembly of solar cells 1 as shown in fig. 7, taken along line a-a, is generally shown in fig. 11. As can be seen from fig. 11, for two adjacent solar cells 1, when the positive electrode 13 'and the back electrode 12' are in direct contact, the top surface magnetic structure 31 'and the bottom surface magnetic structure 32' are also magnetically attracted to fix the two adjacent solar cells 1 with respect to each other. In this case, in order to make the light receiving surface of the solar cell sheet 1 sufficiently large, it is also necessary to set the positive electrode 13 ', the back electrode 12', and the magnetic structure to be sufficiently thin so that the size of the portion of the adjacent solar cell sheets 1 that are overlapped together is sufficiently small.
Fig. 8 shows an alternative to fig. 7. In fig. 8, the back electrode 12 "is arranged along the longitudinal edge of the solar cell sheet 1, and the bottom surface magnetic structure 32" is adjacent to the back electrode 12 "and extends parallel to the back electrode 12"; correspondingly, the top surface magnetic structure 31 "is arranged along the other longitudinal edge of the solar cell sheet 1, and the positive electrode 13" extends next to the top surface magnetic structure 31 ", and the extending directions of the positive electrode 13" and the top surface magnetic structure 31 "are also parallel to each other. A schematic view of a stack of solar cells 1 as shown in fig. 7, taken along line a-a, is shown generally in fig. 10. As can be seen from fig. 11, for two adjacent solar cell sheets 1, when the positive electrode 13 "and the back electrode 12" are in direct contact, the top surface magnetic structure 31 "and the bottom surface magnetic structure 32" are also magnetically attracted to fix the two adjacent solar cell sheets 1 relative to each other.
The magnetic structure mentioned in this embodiment may be, for example, a neodymium-iron-boron magnet, a samarium-cobalt magnet, an alnico magnet, or a ferrite magnet, and besides the above-mentioned short strip structure, the magnetic structure may also be a dot structure.
The utility model discloses still provide a manufacturing method of making above-mentioned solar wafer simultaneously, it includes following step:
manufacturing a plurality of solar cell sheets, wherein the plurality of solar cell sheets can be connected in sequence in a shingled manner in a first direction, a positive electrode extending along a second direction is printed on the top surface of a substrate sheet of the solar cell sheets, a back electrode extending along a third direction parallel to the second direction is printed on the bottom surface of the substrate sheet, the positive electrode and the back electrode are spaced in the first direction, and when the two solar cell sheets are connected in the shingled manner, the positive electrode of one of the two solar cell sheets is aligned with and contacts the back electrode of the other of the two solar cell sheets;
the method comprises the steps of arranging a plurality of solar battery pieces in a shingled mode along a first direction, fixing the solar battery pieces to each other, enabling a positive electrode of any two adjacent solar battery pieces to be in contact with a back electrode of the other solar battery piece, and enabling magnetic structures of the two adjacent solar battery pieces to be in direct contact so as to fix each pair of adjacent solar battery pieces relative to each other through magnetism.
Further, the step of manufacturing a plurality of solar cells includes:
pretreating the whole solar cell;
and cutting the whole pretreated solar cell into small pieces to form a plurality of solar cell pieces.
Further, the step of pretreating the whole solar cell comprises the following steps:
texturing the surface of the total substrate sheet of the whole solar cell sheet;
growing and depositing an inner passivation layer on the front surface and the back surface of the total substrate sheet;
growing and depositing a middle passivation layer on the inner passivation layer;
and growing and depositing an outer passivation layer on the middle passivation layer.
More specifically, the inner passivation layer is deposited by a thermal oxidation method or a laughing gas oxidation method or an ozonization method or a nitric acid solution chemical method, and the inner passivation layer is arranged as a silicon dioxide film layer; and/or
The middle passivation layer is deposited by a PECVD or ALD layer or a PVD layer method by using a solid target material, and is set to be an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
The outer passivation layer is deposited using PVD, CVD or ALD methods.
The above-described steps can be further specified and optimized. For example, in the texturing step, a single crystal silicon wafer is subjected to surface texturing to obtain a good textured structure, so that the specific surface area is increased, more photons (energy) can be received, meanwhile, the reflection of incident light is reduced, and the subsequent step can comprise a step of cleaning liquid remained in texturing so as to reduce the influence of acidic and alkaline substances on cell junction making. The method also comprises a step of manufacturing a PN junction after the texturing, which comprises the following steps: reacting phosphorus oxychloride with a silicon wafer to obtain phosphorus atoms; after a certain time, phosphorus atoms enter the surface layer of the silicon wafer and permeate and diffuse into the silicon wafer through gaps among the silicon atoms to form an interface of the N-type semiconductor and the P-type semiconductor. And finishing the diffusion and junction making process and realizing the conversion from light energy to electric energy. Because the diffusion junction forms a short circuit channel at the edge of the silicon wafer, photo-generated electrons collected by the front surface of the PN junction flow to the back surface of the PN junction along the region with phosphorus diffused at the edge to cause short circuit, and the PN junction at the edge is removed by etching through plasma, so that the short circuit caused by the edge can be avoided, and in addition, the SE process step can be added. Moreover, a layer of phosphorosilicate glass is formed on the surface of the silicon wafer in the diffusion junction making process, and the influence on the efficiency of the laminated cell is reduced through the phosphorosilicate glass removing process.
Further, laser grooving can be carried out on the silicon wafer after the passivation layer is formed; and sintering after printing the electrodes, reducing the light attenuation of the battery cell through a light attenuation furnace or an electric injection furnace, and finally testing and grading the battery.
The step of breaking the silicon wafer into a plurality of solar cells is preferably accomplished using a laser cutter. And adding an online laser cutting scribing process to the sintered whole silicon wafer, enabling the sintered whole silicon wafer to enter a scribing detection position for appearance inspection and visually positioning the OK wafer (poor appearance detection can be automatically shunted to the NG position), and freely setting a multi-track scribing machine or presetting a cache stack area according to the online production rhythm so as to realize online continuous feeding operation. And setting relevant parameters of the laser according to the optimal effect of cutting and scribing so as to realize higher cutting speed, narrower cutting heat affected zone and cutting line width, better uniformity, preset cutting depth and the like. And after the automatic cutting is finished, the automatic sheet breaking mechanism of the online laser scribing machine is used for breaking the solar cell sheets at the cutting position to realize the natural separation of the solar cell sheets. It should be noted that the laser cutting surface is far away from the side of the PN junction, so that leakage current caused by damage of the PN junction is avoided, the front and back directions of the battery piece need to be confirmed before the material is cut and fed, and if the front and back directions are opposite, a separate 180-degree reversing device needs to be added.
Wherein, the step of manufacturing the grid line includes: and printing electrodes by silver paste doped with magnetic materials at proper positions so that the positive electrode and the back electrode of the obtained solar cell form a magnetic structure.
Or, as an alternative to the above solution, the step of pretreating the whole solar cell includes the following steps: printing electrodes in place; a magnetic structure is disposed proximate to the electrode.
The method may not comprise the step of applying an adhesive, since the magnetic structure is sufficient to fix the individual solar cells relative to each other.
The utility model discloses a solar wafer, fold tile subassembly and manufacturing method, after solar wafer arranges and forms the fold tile subassembly, the electricity between the solar wafer is connected and is realized through positive electrode and back electrode or the direct contact of back of the body electric field each other, and adsorbs together through magnetic structure between the solar wafer, and need not additionally set up the binder. Such a structure can simplify the production process flow and can avoid the occurrence of problems that may be caused by the failure of the adhesive.
The foregoing description of various embodiments of the invention is provided to one of ordinary skill in the relevant art for the purpose of illustration. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. As noted above, various alternatives and modifications of the present invention will be apparent to those skilled in the art of the above teachings. Thus, while some alternative embodiments are specifically described, other embodiments will be apparent to, or relatively easily developed by, those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications and variances of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention as described above.
Reference numerals:
Back electrodes 12, 12', 12 "
Top surface magnetic structures 31, 31', 31 "
Bottom surface magnetic structure 32, 32', 32 "
First direction D1
Second direction D2
Third direction D3
Claims (19)
1. A stack assembly comprising a plurality of solar cell sheets arranged in sequence in a stack manner in a first direction, wherein the solar cell sheets comprise a substrate sheet, a positive electrode extending in a second direction is disposed on a top surface of the substrate sheet, a back electrode extending in a third direction parallel to the second direction is disposed on a bottom surface of the substrate sheet, and a space exists between the positive electrode and the back electrode in the first direction,
the solar cell is characterized in that the positive electrode of one of any two adjacent solar cells is directly contacted with the back electrode or back electric field of the other solar cell to realize conductive connection,
wherein each of the solar cells has magnetic structures on top and bottom surfaces thereof, and the magnetic structures on the opposing surfaces of any two adjacent solar cells in the stack are capable of magnetically attracting to fix the two solar cells relative to each other when the positive and back electrodes of the two solar cells are in contact.
2. The stack assembly of claim 1, wherein the magnetic structures are the positive and back electrodes on the solar cell sheet, and the positive and back electrodes are magnetic conductive stripe structures or dot structures.
3. The stack assembly of claim 1, wherein the magnetic structure is independent of the positive electrode and the back electrode.
4. The stack assembly of claim 1, wherein the positive electrode and/or the back electrode are intermittently arranged in an extension direction thereof, the positive electrode and the back electrode being at least partially aligned in the first direction.
5. The stack assembly of claim 4, wherein the positive electrode is intermittently disposed in the second direction and the back electrode is continuously disposed in the third direction; or
The positive electrode is continuously arranged in the second direction, and the back electrode is discontinuously arranged in the third direction; or
The positive electrodes are intermittently arranged in the second direction, the back electrodes are intermittently arranged in the third direction, and the positive electrodes and the back electrodes are aligned in the first direction.
6. The stack assembly of claim 1, wherein the magnetic structure is independent of the positive electrode and the back electrode, and,
the positive electrode, the back electrode and the magnetic structures are all formed into a plurality of short strip-shaped structures which are arranged in sequence and discontinuously in the extending direction of the positive electrode, the back electrode and the magnetic structures on the top surface are arranged alternately in the second direction, the back electrode and the magnetic structures on the bottom surface are arranged alternately in the third direction, and the positive electrode and the back electrode are aligned in the first direction.
7. The shingle assembly of claim 4, wherein the positive electrode and the back electrode are each formed in a zigzag configuration, and when two solar cells are connected in a shingled manner, the positive electrode and the back electrode of the two solar cells are in contact with each other in a rack-and-pinion manner.
8. The stack tile assembly of claim 3 or 6, wherein the magnetic structure is a neodymium iron boron magnet strip structure, a samarium cobalt magnet strip structure, an alnico magnet strip structure, or a ferrite magnet strip structure, and the magnetic structure is proximate to the back electrode or the positive electrode.
9. The stack assembly of claim 3, wherein the magnetic structure is a stripe structure, and for each of the solar cells, the magnetic structure on the top surface is proximate to the positive electrode and extends in a direction parallel to the second direction; the magnetic structure on the bottom surface is proximate to the back electrode and extends in a direction parallel to the third direction.
10. The stack assembly of any of claims 1-7, wherein the inter-cell connections are free of adhesive.
11. A solar cell sheet, a plurality of the solar cell sheets can be connected in sequence in a shingled manner in a first direction, the solar cell sheet is characterized by comprising a substrate sheet, a positive electrode extending along a second direction is arranged on the top surface of the substrate sheet, a back electrode extending along a third direction parallel to the second direction is arranged on the bottom surface of the substrate sheet, the solar cell sheet is constructed to enable direct contact between the positive electrode of one of the two solar cell sheets and the back electrode of the other of the two solar cell sheets to realize conductive connection when the two solar cell sheets are connected in the shingled manner in the first direction,
and, the solar cell sheets have magnetic structures on top and bottom surfaces thereof, the magnetic structures being configured such that the magnetic structures on opposing surfaces of any two adjacent solar cell sheets can magnetically attract when the positive and back electrodes of the two solar cell sheets are in contact to fix the two adjacent solar cell sheets relative to each other.
12. The solar cell sheet according to claim 11, wherein the magnetic structures are the positive electrode and the back electrode on the solar cell sheet, and the positive electrode and the back electrode are magnetic conductive strip structures or dot structures.
13. The solar cell sheet of claim 11, wherein the magnetic structure is independent of the positive electrode and the back electrode.
14. Solar cell sheet according to claim 11,
the positive electrode and/or the back electrode are intermittently arranged in an extending direction thereof, and the positive electrode and the back electrode are at least partially aligned in the first direction.
15. The solar cell sheet according to claim 11, wherein the positive electrode is intermittently arranged in the second direction, and the back electrode is continuously arranged in the third direction; or
The positive electrode is continuously arranged in the second direction, and the back electrode is discontinuously arranged in the third direction; or
The positive electrodes are intermittently arranged in the second direction, the back electrodes are intermittently arranged in the third direction, and the positive electrodes and the back electrodes are aligned in the first direction.
16. The solar cell sheet of claim 13, wherein the magnetic structure is independent of the positive electrode and the back electrode, and,
the positive electrode, the back electrode and the magnetic structure respectively comprise a plurality of short strip-shaped structures which are sequentially arranged in the extending direction of the positive electrode, the magnetic structures on the top surface and the positive electrode are alternately arranged in the second direction, the magnetic structures on the back electrode and the bottom surface are alternately arranged in the third direction, and the positive electrode and the back electrode are aligned in the first direction.
17. The solar cell sheet according to claim 11, wherein the positive electrode and the back electrode are each formed in a zigzag structure, and when two solar cell sheets are connected in a shingled manner, the positive electrode and the back electrode of the two solar cell sheets are in contact with each other in a rack-and-pinion manner.
18. The solar cell of claim 12 or 15, wherein the magnetic structure is a stripe structure or a dot structure of neodymium-iron-boron magnet, samarium-cobalt magnet, alnico magnet or ferrite magnet, and the magnetic structure is close to the back electrode or the positive electrode.
19. The solar cell sheet according to claim 13, wherein the magnetic structure is a stripe structure, and the magnetic structure on the top surface is adjacent to the positive electrode and extends in a direction parallel to the second direction; the magnetic structure on the bottom surface is proximate to the back electrode and extends in a direction parallel to the third direction.
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| CN111162133A (en) * | 2020-01-19 | 2020-05-15 | 成都晔凡科技有限公司 | Laminated tile assembly, solar cell and manufacturing method of laminated tile assembly |
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| CN111162133A (en) * | 2020-01-19 | 2020-05-15 | 成都晔凡科技有限公司 | Laminated tile assembly, solar cell and manufacturing method of laminated tile assembly |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: TONGWEI SOLAR ENERGY (HEFEI) Co.,Ltd. Assignor: CHENGDU YEFAN SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023990000264 Denomination of utility model: Tile stack module and solar cell Granted publication date: 20201103 License type: Common License Record date: 20230221 |
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Effective date of registration: 20231207 Address after: 230000 No.888 Changning Avenue, hi tech Zone, Hefei City, Anhui Province Patentee after: TONGWEI SOLAR ENERGY (HEFEI) Co.,Ltd. Address before: No. 505, building 6, Zone D, Tianfu Software Park, No. 599, shijicheng South Road, high tech Zone, Chengdu, Sichuan 610041 Patentee before: CHENGDU YEFAN SCIENCE AND TECHNOLOGY Co.,Ltd. |