CN210325819U

CN210325819U - Laminated tile assembly and solar cell

Info

Publication number: CN210325819U
Application number: CN201921471143.5U
Authority: CN
Inventors: 尹丙伟; 孙俊; 倪孙洋; 陈登运; 丁士引; 李岩; 石刚; 谢毅; 刘汉元
Original assignee: Chengdu Yefan Science and Technology Co Ltd
Current assignee: Tongwei Solar Hefei Co Ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2020-04-14
Anticipated expiration: 2029-09-05

Abstract

The utility model relates to a fold tile subassembly, solar wafer. The solar cell assembly comprises a plurality of solar cells, a base sheet and a plurality of solar cells, wherein the plurality of solar cells are sequentially connected in a shingled manner in a first direction, a positive electrode extending in a second direction is arranged on the top surface of the base sheet of each solar cell, a back electrode or a back electric field is arranged on the bottom surface of the base sheet, and when the two solar cells are connected in the shingled manner in the first direction, the positive electrode of one of the two solar cells is in direct contact with the back electrode or the back electric field of the other solar cell to realize conductive connection. According to the present invention, the conductive interconnection between the solar cells is achieved by direct contact between the positive electrode and the back electrode, and thus the conductivity of the binder is not required. Such an arrangement can reduce manufacturing costs and avoid existing problems that may arise due to the presence of conductive glue.

Description

Laminated tile assembly and solar cell

Technical Field

The utility model relates to an energy field especially relates to a shingle assembly, 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.

There is therefore a need to provide a stack of tiles, 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, 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 does not rely on the electric conductivity of binder.

According to an aspect of the present invention, there is provided a laminated assembly comprising a plurality of solar cell sheets sequentially arranged in a laminated manner in a first direction and fixed with respect to each other by a binder, wherein the solar cell sheets comprise a base sheet, a positive electrode extending in a second direction is provided on a top surface of the base sheet, a back electrode or a back field is provided on a bottom surface of the base sheet,

the positive electrode of any two adjacent solar cells is in direct contact with the back electrode or the back electric field of the other solar cell to realize conductive connection.

In one embodiment, a back electrode extending in a third direction parallel to the second direction is provided on a bottom surface of the base sheet, the positive electrode and the back electrode are spaced in the first direction,

wherein the positive electrode and/or the back electrode are intermittently arranged in the extending direction 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 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 adhesive extends over the overlapping edges of each pair of adjacent solar cells.

In one embodiment, the adhesive is intermittently disposed on the overlapping edges of each pair of adjacent solar cells.

In one embodiment, the adhesive is applied to the ends of the contacting positive and back electrodes of each pair of adjacent solar cells.

In one embodiment, the adhesive is located on one side of the contacted positive electrode and back electrode of each pair of adjacent solar cells, and the joint height of the contacted positive electrode and back electrode of each pair of adjacent solar cells is greater than or equal to the height of the adhesive.

In one embodiment, the adhesive extends in a first direction to span a plurality of the solar cells.

In one embodiment, the adhesive is a conductive glue, or the adhesive is not conductive.

According to another aspect of the present invention, there is provided a solar cell, which is characterized in that the solar cell comprises a substrate, a positive electrode extending along a second direction is disposed on the top surface of the substrate, a back electrode or a back electric field is disposed on the bottom surface of the substrate, the solar cell is configured such that when two solar cells are connected in a shingled manner along the first direction, one of the two solar cells can directly contact with the other of the positive electrode and the back electrode or the back electric field to realize conductive connection.

In one embodiment, a back electrode (12) extending in a third direction (D3) parallel to the second direction is provided on the bottom surface of the substrate sheet, the positive electrode and the back electrode are spaced in the first direction, the positive electrode of one of the two solar cells can be aligned and contacted with the back electrode of the other when the two solar cells are connected in a shingled manner in the first direction,

and the positive electrode and/or the back electrode are intermittently arranged in the extending direction thereof, the positive electrode and the back electrode being at least partially aligned in the first direction.

According to the utility model discloses, when becoming the laminated tile subassembly with solar wafer interconnection, realize electrically conductive interconnection through the direct contact of positive electrode and back electrode each other between the solar wafer, therefore can omit the conducting resin that has electric conductivity. Like this, factors that easily destroy conducting resin such as environmental erosion, high low temperature alternation, expend with heat and contract with cold just can not influence the utility model discloses a shingle assembly, shingle assembly is difficult to appear the electric current virtual connection and open circuit. Moreover, as the conductive adhesive is not needed to be arranged, the problems of open circuit of the positive electrode and the negative electrode of the laminated assembly and the like caused by adhesive overflow can be avoided. In addition, because the conductivity of the adhesive is not required, the production cost of the laminated assembly is also reduced.

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;

3-7 are schematic diagrams of several alternative preferred embodiments of the solar cell sheet of FIG. 1;

fig. 8 to 12 are side sectional views taken along line a-a of fig. 2, illustrating a connection state between adjacent two solar cells in several preferred embodiments.

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, solar wafer, fig. 1 to fig. 12 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 laminated tile assembly 2, which is substantially consistent with a width direction of each 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 or the back field 14. 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.

Preferably, as shown in fig. 1, 3 to 5, the back electrode 12 is printed on the bottom surface 25 of the base sheet 11 along a third direction D3 parallel to the second direction D2, and 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 jointed, the positive electrode 13 and the back electrode 12 are contacted with each other in a rack meshing manner, which is shown in fig. 12. 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.

In the embodiment shown in fig. 6 and 7, the back electrode 12 may be replaced with a back electric field 14. In the solution shown in fig. 7, since the positive electrode 13 is provided intermittently, the corresponding edge of the bottom surface 25 of the solar cell sheet 1 may also be provided with a corresponding notch, and the back electric field 14 is applied at the edge.

The laminated tile assembly 2 provided by the present invention can be formed by connecting the solar cells 1. After the solar cell sheets 1 are interconnected with each other, the respective solar cell sheets 1 may be fixed with respect to each other by the adhesive 4, and the adhesive 4 may preferably have no conductivity, but of course, the adhesive 4 may also have conductivity. For example, the adhesive 4 may be made of acrylic resin, silicone resin, epoxy resin, polyurethane, etc., and in order to form a certain thickness, some additives or substances, such as curing agent, cross-linking agent, coupling agent, rubber ball, etc., may be added to the resin.

The adhesive 4 may also have various arrangements. For example, the adhesive 4 may be continuously or intermittently applied on the overlapping edges of the adjacent solar cell sheets 1, or the adhesive 4 may be applied on the top surfaces 24 of the plurality of solar cell sheets 1 along the first direction D1 so that the adhesive 4 spans the plurality of solar cell sheets 1.

Fig. 8 to 12 show cross-sectional views of two adjacent solar cells 1 in an interconnected state in several embodiments, which can be regarded as a view of the shingle assembly 2 of fig. 2 taken along line a-a. For convenience of description, the two solar cells 1 in the drawings are respectively referred to as a first solar cell 21 and a second solar cell 22.

In fig. 8, 9 and 12, the positive electrode 13 of the first solar cell 21 is in conductive contact with the back electrode 12 of the second solar cell 22, and the surface of the positive electrode 13 and the back electrode 12 in contact with each other is a conductive contact surface 23. The adhesive 4 is intermittently disposed on the overlapping edges of the first solar cell sheet 21 and the second solar cell sheet 22. The adhesive 4 structure may be formed by applying a spot of adhesive 4 intermittently to each overlapping edge or by applying a plurality of adhesive 4 extending in the first direction D1 on the top surface of the laminated tile assembly 2. It can be seen that in fig. 8 and 9, the height of the adhesive 4 portion (i.e., the dimension in the height direction H in fig. 8) is equal to the joining height of the positive electrode 13 and the back electrode 12 (i.e., the dimension in the height direction H of the contact portion of the positive electrode 13 and the back electrode 12). The size of the junction of the positive electrode 13 and the back electrode 12 in fig. 12 should be smaller than the sum of the height of the positive electrode 13 and the height of the back electrode 12.

In fig. 10, the positive electrode 13 of the first solar cell sheet 21 is in conductive contact with the back electrode 12 of the second solar cell sheet 22, and the surfaces of the positive electrode 13 and the back electrode 12 that are in contact with each other are conductive contact surfaces 23. The adhesive 4 is intermittently provided on the overlapping edges of the first solar cell sheet 21 and the second solar cell sheet 22, and the adhesive 4 is applied at the end portions of the positive electrode 13 and the back electrode 12, which prevents EVA from entering the contact portions between the solar cell sheets 1 to hinder electrical connection during lamination of the laminated assembly 2.

In fig. 11, the positive electrode 13 of the first solar cell sheet 21 is in conductive contact with the back electrode 12 of the second solar cell sheet 22, the surfaces of the positive electrode 13 and the back electrode 12 that are in contact with each other are conductive contact surfaces 23, the adhesive 4 is intermittently provided on the overlapping edges of the first solar cell sheet 21 and the second solar cell sheet 22, and the height of the adhesive 4 is smaller than the bonding height of the positive electrode 13 and the back electrode 12.

The utility model discloses still provide a manufacturing method of making above-mentioned solar wafer 1 simultaneously, it includes following step:

manufacturing a plurality of solar cell sheets 1, wherein the plurality of solar cell sheets 1 can be connected in sequence in a shingled manner in a first direction D1, the top surface 24 of the base sheet 11 of each solar cell sheet 1 is printed with a positive electrode 13 extending along a second direction D2, the bottom surface 25 of the base sheet 11 is printed with a back electrode 12 extending along a third direction D3 parallel to the second direction D2, the positive electrode 13 and the back electrode 12 are spaced in the first direction D1, and when the two solar cell sheets 1 are connected in the shingled manner, the positive electrode 13 of one of the two solar cell sheets 1 is aligned with and contacts the back electrode 12 of the other of the two solar cell sheets 1;

applying an adhesive 4 on each solar cell sheet 1;

the plurality of solar cells 1 are arranged in a shingled manner along the first direction D1, fixed to each other, and such that the positive electrode 13 of one of any two adjacent solar cells 1 is in contact with the back electrode 12 of the other.

Further, the step of manufacturing the plurality of solar cells 1 includes:

pretreating the whole solar cell 1;

the whole solar cell sheet 1 after the pretreatment is cut into small pieces to form a plurality of solar cell sheets 1.

Further, the step of pretreating the whole solar cell 1 includes:

texturing on the surface of the overall substrate sheet 11 of the whole solar cell sheet 1;

an inner passivation layer is grown and deposited on the front surface and the back surface of the total substrate sheet 11;

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 1 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 solar cell pieces 1 are split at the cutting position by an automatic piece breaking mechanism of the online laser scribing machine, so that the solar cell pieces 1 are naturally separated. 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.

Finally, after all the solar cells 1 are connected in series to form the tile-folded assembly 2, the packaging of the tile-folded assembly 2 is completed through the links of automatic typesetting and converging, glue film and back plate laying, intermediate detection, laminating, trimming, framing, intermediate junction box curing, cleaning, testing and the like.

The utility model discloses a solar wafer, fold tile subassembly and manufacturing method for when the solar wafer interconnection becomes the fold tile subassembly, realize electrically conductive interconnection through the direct contact of positive electrode and back electrode each other between the solar wafer, therefore can omit the conducting resin that has electric conductivity. Like this, environmental erosion, high low temperature alternation, expend with heat and contract with cold etc. destroy the conducting resin factor just can not influence the utility model discloses a shingle assembly, therefore be difficult to appear the electric current virtual connection and open circuit. Moreover, as the conductive adhesive is not needed to be arranged, the problems of open circuit of the positive electrode and the negative electrode of the laminated assembly and the like caused by adhesive overflow can be avoided. In addition, because the conductivity of the adhesive is not required, the production cost of the laminated assembly is also reduced.

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:

solar cell 1

Shingle assembly 2

Top surface 24 of solar cell sheet

Bottom surface 25 of solar cell sheet

Base sheet 11

Positive electrode 13

Back electrode 12

Back electric field 14

Binder 4

First solar cell 21

Second solar cell piece 22

Conductive contact surface 23

First direction D1

Second direction D2

Third direction D3

Height direction H

Claims

1. A stack of solar cells, comprising a plurality of solar cells arranged in sequence in a stack in a first direction (D1) and fixed with respect to each other by means of an adhesive (4), wherein the solar cells comprise a substrate sheet (11) provided with a positive electrode (13) extending in a second direction (D2) on a top surface (24) thereof and provided with a back electrode (12) or a back field (14) on a bottom surface (25) thereof,

the solar cell is characterized in that the positive electrode of one of any two adjacent solar cells is in direct contact with the back electrode or the back electric field of the other solar cell to realize conductive connection.

2. A stack assembly according to claim 1, wherein a back electrode (12) extending in a third direction (D3) parallel to the second direction is provided on a bottom surface of the base sheet, the positive and back electrodes being spaced apart in the first direction,

3. The stack assembly of claim 2, wherein the positive electrode is intermittently disposed in the second direction and the back electrode is continuously disposed in the third direction; or

4. The shingle assembly of claim 2, 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.

5. The shingle assembly of claim 1, wherein the adhesive extends over the overlapping edges of each pair of adjacent solar cells.

6. The shingle assembly of claim 1, wherein the adhesive is intermittently disposed on the overlapping edges of each pair of adjacent solar cells.

7. The shingle assembly of claim 2, wherein the adhesive is applied to the ends of the contacted positive and back electrodes of each pair of adjacent solar cells.

8. The shingle assembly according to claim 2 wherein the adhesive is located on one side of the contacted positive and back electrodes of each pair of adjacent solar cells, and the bonded height of the contacted positive and back electrodes of each pair of adjacent solar cells is greater than or equal to the height of the adhesive.

9. The shingle assembly of claim 1, wherein the adhesive extends in a first direction to span a plurality of the solar cells.

10. The tile stack assembly of any one of claims 1-9, wherein the adhesive is a conductive glue or the adhesive is not conductive.

11. A solar cell sheet (1), a plurality of which can be connected in sequence in a shingled manner in a first direction (D1), characterized in that the solar cell sheet comprises a substrate sheet (11), a positive electrode (13) extending in a second direction (D2) is provided on a top surface (24) of the substrate sheet, and a back electrode (12) or a back field (14) is provided on a bottom surface (25) of the substrate sheet, the solar cell sheet being configured such that when two of the solar cell sheets are connected in a shingled manner in the first direction, direct contact can be made between the positive electrode of one of the two solar cell sheets and the back electrode or back field of the other of the two solar cell sheets to achieve an electrically conductive connection.

12. The solar cell sheet according to claim 11, wherein a back electrode (12) extending in a third direction (D3) parallel to the second direction is provided on a bottom surface of the base sheet, the positive electrode and the back electrode are spaced in the first direction, the positive electrode of one of the two solar cell sheets can be aligned and brought into contact with the back electrode of the other when the two solar cell sheets are connected in a shingled manner in the first direction,

13. The solar cell sheet according to claim 12, wherein the positive electrode is intermittently arranged in the second direction, and the back electrode is continuously arranged in the third direction; or

14. The solar cell sheet according to claim 12, 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.