CN212085026U

CN212085026U - Shingle assembly

Info

Publication number: CN212085026U
Application number: CN202020437097.3U
Authority: CN
Inventors: 孙俊; 尹丙伟; 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: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-12-04
Anticipated expiration: 2030-03-30

Abstract

The utility model relates to a fold tile subassembly. The utility model provides a shingle assembly includes the battery piece array, and the battery piece array includes the battery cluster, and the battery cluster is including arranging the piece membrane in advance again, arranges the piece membrane in advance and be whole membrane structure and can be fixed each solar wafer for it through the hot melt. And the bottom side film and/or the top side film on the surface of the array of battery cells is a thermoplastic monolithic film structure and can be fixed together with the array of battery cells by heat fusion. According to the utility model provides a scheme can be fixed the solar wafer relative to each other and form the battery cluster through the heating melting characteristic of arranging the piece membrane in advance, and need not additionally to use the binder. The scheme can combine the typesetting process and the laminating process into one, and the mode has the advantages of low cost, high efficiency and easy operation. And no binder is additionally arranged, so that the cost can be saved and the production efficiency can be improved.

Description

Shingle assembly

Technical Field

The utility model relates to an energy field especially relates to a stack subassembly.

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.

It is therefore desirable to provide a method of manufacturing a stack assembly and a stack assembly that addresses the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a method of manufacturing stack subassembly and stack subassembly. According to the utility model provides a scheme can fix the solar wafer on thermoplastic row's piece membrane in advance through the hot melt thereby form the battery cluster in the in-process of arranging the piece in advance of solar wafer to fix the battery cluster on it through the heating and melting characteristic of bottom side membrane and/or top side membrane, and need not additionally to use conducting resin and/or binder. The scheme combines the typesetting process and the laminating process into a whole, and has the advantages of low cost, high efficiency and easy operation. Moreover, a series of problems possibly caused by the conductive adhesive can be avoided because the conductive adhesive is not required to be arranged.

According to an aspect of the utility model, a stack of tiles subassembly is provided, the stack of tiles subassembly includes:

a package structure comprising a bottom side film and a top side film;

a cell array located between the bottom film and the top film and contacting the top film and the bottom film, wherein the cell array comprises a plurality of cell strings, each cell string comprises a plurality of solar cells arranged in a shingled manner along a first direction, main grid lines are arranged on the solar cells, any two adjacent solar cells in each cell string are in direct contact with each other through the main grid lines to realize conductive connection, and pre-arrangement films are arranged on the top surface and the bottom surface of each cell string,

wherein a top pre-arrangement film disposed on a top surface of the cell string and a bottom pre-arrangement film disposed on a bottom surface of the cell string are of an integral film structure and are capable of fixing the respective solar cells relative thereto by heat fusion,

and, the bottom side film and/or the top side film is a thermoplastic monolithic film structure and is capable of being secured together with the array of battery cells by thermal fusion.

In one embodiment, the solar cell is a crystalline silicon solar cell or a heterojunction solar cell.

In one embodiment, the solar cell sheet is formed in a rectangular shape, and the length thereof is 2 to 10 times the width.

In one embodiment, the bottom-side film and the top-side film are an EVA monolithic film structure, a POE monolithic film structure, or a silicone monolithic film structure.

In one embodiment, the package structure further comprises a top plate and a bottom plate located below the bottom film, the top plate and the bottom plate being rigid or flexible weather-resistant monolithic structures having dimensions larger than the array of battery strings.

In one embodiment, the size of the overlapping portion between the adjacent solar cells of each cell string in the second direction is 0.05mm-5 mm.

In one embodiment, the bus bar is a positive electrode disposed on a top surface of the solar cell sheet and a back electrode disposed on a bottom surface of the solar cell sheet, wherein

The positive electrode is discontinuously arranged in the extending direction of the positive electrode, and the back electrode is continuously arranged in the extending direction of the back electrode; or

The positive electrode is continuously arranged in the extending direction of the positive electrode, and the back electrode is discontinuously arranged in the extending direction of the back electrode; or

The positive electrode is intermittently arranged in the extending direction thereof, the back electrode is intermittently arranged in the extending direction thereof, and the positive electrode and the back electrode are aligned in the second direction.

In one embodiment, the bus bar is a positive electrode disposed on a top surface of the solar cell sheet and a back electrode disposed on a bottom surface of the solar cell sheet, the positive electrode and the back electrode are each formed in a concavo-convex structure, and when two solar cell sheets are connected in a shingled manner, concave and convex portions of the positive electrode and the back electrode of the two solar cell sheets are engaged with each other.

In one embodiment, the positive electrode and the back electrode are 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 solar cell sheets within the shingle assembly include multiple gauge sizes.

In one embodiment, no adhesive is provided within the stack for securing the individual solar cells relative to each other.

In one embodiment, the top pre-row sheet membrane and the bottom pre-row sheet membrane are TPO membranes sized to fit the top and bottom surfaces of the battery string.

According to the utility model discloses, thereby can fix the solar wafer on thermoplastic arrange the piece membrane in advance through the hot melt at the in-process of arranging the piece in advance of solar wafer and form the battery cluster to fix the battery cluster on it through the heating and melting characteristic of bottom side membrane and/or top side membrane, and need not additionally to use conducting resin and/or binder. The scheme combines the typesetting process and the laminating process into a whole, and has the advantages of low cost, high efficiency and easy operation. Moreover, a series of problems possibly caused by the conductive adhesive can be avoided because the conductive adhesive is not required to be arranged.

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.

Figure 1 is a flow diagram of a method of manufacturing a shingle assembly in accordance with a preferred embodiment of the present invention;

fig. 2 is a schematic top surface view of a battery string according to a preferred embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view of another embodiment taken along line A-A of FIG. 2;

fig. 5 is a sectional view taken along line a-a in fig. 2 of still another embodiment.

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 shingle assembly, fig. 1 to 3 show the preferred embodiment of the utility model.

In a preferred embodiment, a stack assembly includes an encapsulation structure and an array of battery cells within the encapsulation structure. The package structure may further include a top plate, a top side film, a bottom plate, and a bottom side film, wherein the top side film is located on the top surface of the array of battery pieces and directly contacts the array of battery pieces, the top plate covers the top side film, the bottom side film is located on the bottom surface of the array of battery pieces and directly contacts the bottom surface of the array of battery pieces, and the bottom plate is located below the bottom side film. In the present invention, the bottom film is a thermoplastic bottom film. The top and bottom sheets may be, for example, rigid sheets such as tempered glass, and the top and thermoplastic bottom films may be flexible film structures made of EVA, POE, or silicone. The cell array is in turn made up of a plurality of cell strings, wherein the top and bottom surfaces of each cell string are further provided with a thermoplastic top and bottom pre-alignment film, which may be, for example, a thermoplastic polyolefin film, i.e., TPO film. Hereinafter, the top TPO membrane is understood to be a preferred example of a top pre-row sheet membrane, and the bottom TPO membrane is understood to be a preferred example of a bottom pre-row sheet membrane.

A preferred embodiment of a method of manufacturing the stack of tiles is generally shown in figure 1, and as can be seen the method generally comprises steps S1 to S4.

Step S1 is a step of laying a thermoplastic bottom-side film. Specifically, step S1 may further include providing a base sheet and laying the thermoplastic bottom-side film onto the base sheet such that the center of the thermoplastic bottom-side film substantially coincides with the center of the base sheet.

Step S2 is a step of pre-arranging the solar cells. Step S21, step S22, and step S23 are included in this step.

Step S21 is to set a top TPO membrane and a bottom TPO membrane, and heat-melt a region to be received of the bottom TPO membrane.

Step S22 is to place the solar cell pieces between the top TPO film and the bottom TPO film in a shingled manner, so that the adjacent solar cell pieces are electrically connected by direct contact of the main grid lines. The bottom TPO film is in contact with the solar cell sheet in a molten state.

Step S23 is to cool the region of the bottom TPO film where the solar cell sheet is placed so that the region in the molten state can be fixed to the solar cell sheet after solidification.

It should be noted that steps S21-S23 are not necessarily completed in order. For example, the base TPO membrane can be heated prior to placing the solar cell sheet thereon; alternatively, the solar cell sheet may be first placed on the base TPO film and the base TPO film may be heated. Alternatively, various modifications may be provided to steps S21-S23, for example, a solar cell sheet may be placed on the bottom TPO film, followed by placing the heated top TPO film on the top side of the solar cell sheet; alternatively, the solar cell sheet may be placed between the top and bottom TPO membranes and then the top and/or bottom TPO membranes are reheated. In this embodiment, the bottom TPO film is heated to fix the solar cell string.

Preferably, in this embodiment, heat is applied to the base TPO membrane by a heating mechanism that is independent of the shingle assembly to accomplish the heating. More preferably, the heating parameters (e.g., heating temperature, heating time, etc.) of the heating process are matched to the characteristics of the TPO membrane to ensure that the area of the base TPO membrane to be received is in a controlled molten state. The heating method can be a direct heating method, an infrared heating method, a microwave heating method or a laser heating method, or the heating can be realized by an infrared and ultraviolet combined illumination mode. More preferably, the heating process can be local heating or global heating of the thermoplastic base TPO membrane.

Preferably, a manipulator can be arranged to complete the step, and parameters of the manipulator can be set based on the size of the solar cell and the position of the main grid line on the solar cell, so that the manipulator can accurately contact the main grid line of the adjacent solar cell when in operation. More preferably, a plurality of groups of mechanical hands can be arranged to work simultaneously and arrange the sheets simultaneously. More preferably, the quality of the lamination is detected by a detection mechanism in the process of arranging the solar cells into the cell string, and the detection result is fed back to the monitoring platform in real time. The manufacturing system further includes a control device that is associated with the detection mechanism so as to control the lamination work mechanism based on a detection result of the detection mechanism.

In step S2, the TPO film can fix the solar cell sheet thereon after melting and solidifying. Since the solar cell is fixed on the TPO membrane by the method, no additional adhesive material such as adhesive is needed.

Step S3 is a step of arranging the respective cell strings on the thermoplastic bottom-side film. The step further includes steps S31, S32, S33.

In step S31, the thermoplastic bottom-side film is heated to bring its area to be received into a molten state; accurately placing each battery string on the melted region of the thermoplastic bottom-side film and arranging the respective battery strings into an array of battery pieces in step S32; in step S33, the location of the thermoplastic bottom film where the string of cells is placed is cooled to fix each string of solar cells on the thermoplastic bottom film.

Similar to steps S21-S23, steps S31-S33 are not necessarily completed in the above order. For example, the individual cell strings can be placed on the thermoplastic bottom-side film first, and then the thermoplastic bottom-side film can be heated. Further, steps S31-S33 may be modified in some ways, for example, the thermoplastic top-side film may be heated to fix the respective cell strings.

Step S4 is a subsequent processing step. For example, other package structures may be provided in this step. For example, in this step, bus bars are provided, a top side film is applied on the top surface of the cell array and a top plate is covered on the top side film. This step may also include an integral lamination step. And (3) before the laminating step, performing defect detection on the lamination piece by adopting EL electroluminescence or PL photoluminescence, and if the detection is unqualified, performing defect detection again after the lamination piece is repaired. The color of the monolithic body obtained after lamination may be a color with distinct appearance characteristics, such as black or white.

It is again emphasized that the individual steps described above are merely schematic and that their chronological order does not necessarily follow the order described above.

Alternative embodiments in addition to those described above are given here. For example, the heating step of the TPO film and the step of placing the solar cell sheet on the TPO film are simultaneously performed so that the region of the bottom TPO film to receive the solar cell sheet is always kept in a molten state. More preferably, the heating parameters of the heating process may be preset such that, for two solar cells successively placed in sequence, the former solar cell is fixed on the bottom TPO film in the process of placing the latter solar cell on the bottom TPO film, and the former solar cell can be used as a reference for placing the latter solar cell. The arrangement can enable the melting state of the TPO membrane to be relatively controllable, and avoid damage to the thermoplastic bottom membrane or the solar cell slice caused by overhigh overall heating temperature.

For another example, the step of heating and melting the region to be received of the bottom TPO film and the step of placing the solar cell sheet in the region to be received may occur simultaneously in the following manner: and placing the self-heating solar cell piece on the bottom TPO membrane to melt the bottom TPO membrane. Specifically, the solar cell sheet is heated before being placed, and when the solar cell sheet is placed on the bottom TPO membrane, the bottom area of the solar cell sheet can be heated and melted, and after the area is melted and cooled, the solar cell sheet can be fixed on the bottom area of the TPO membrane.

Preferably, the method provided by the present invention may further comprise some steps not shown in fig. 1. For example, the method further comprises the following steps after placing the array of battery pieces on the thermoplastic bottom-side film: and arranging a bus bar on the cell array to lead the current of the cell array outwards. For another example, the top and bottom panels can be made of multiple layers of weatherable materials such as TPT, KPK, KPM, KPC, APE, and the like. For another example, a step of punching holes on the top and bottom TPO membranes before pre-lamination may be included, the holes having a diameter of 1mm to 10mm, such an arrangement enabling the top and bottom TPO membranes to be kept flat and free from wrinkles during pre-lamination.

Preferably, the method provided by the present invention further comprises a step of manufacturing the solar cell sheet. The manufacturing method of the solar cell piece comprises the following steps: arranging a whole solar cell; laser grooving is carried out on the whole solar cell piece; and splitting the whole solar cell into a plurality of solar cells.

The above steps may also have further optimized settings. For example, the whole solar cell is subjected to visual detection and position positioning, and the detection platform is provided with high-precision CCD cameras above and below to capture special patterns (such as mark points, main and auxiliary grids and the like) on the front and back surfaces of the solar cell and PL (photoluminescence laser detector) so as to realize that the printing error of the solar cell exceeds a certain range, and the appearance defect or the internal crack is automatically identified and removed to an NG material box. It should be noted that, after the stack tile battery is subjected to precise color, efficiency and high-low open-voltage sorting, the loaded battery is a battery with basically consistent attributes (capable of matching with the small-piece sorting function). Meanwhile, the equipment feeding platform is suitable for feeding small pieces and is provided with a special material box and a processing mechanism.

And then, the qualified whole solar cell is accurately transmitted to a laser cutting platform, the transmission mode can adopt servo transportation or a transmission belt with adsorption, the laser cutting track carries out position compensation according to the visual positioning of the solar cell, and finally, the whole solar cell is accurately cut and split into 2-N solar cells along the cell cutting position by laser.

And carrying out high-precision visual inspection on the heat affected zone, the cutting depth, the cutting line width and the like of the cut solar cell. The NG slices which are detected to be unqualified on line are placed at an NG station, a laser cutting process comprises the use of lasers with different wavelengths (such as picoseconds or femtosecond level lasers matched with lower wave bands of green light, purple light and the like on the basis of red nanosecond), and the method can be suitable for splitting slices in a local thermal stress low-loss or nondestructive mode.

Furthermore, the split solar cell or the solar cell which is separately processed completely outside the line is automatically rejected on line due to poor appearance through CCD visual inspection screening, and meanwhile, relative position coordinates are output to a transmission robot or a motion module to realize loading lamination processing. The module comprises a multi-head carrying mechanical device, and can realize the carrying and lamination laying actions of a plurality of groups of multi-sheet or single-sheet laminated batteries. Wherein the processing link integrates the functions of mechanical correction and visual positioning deviation correction and realizes the module of lamination laying angle and paster stress control, each mechanical and electrical system can be automatically controlled, and the precision can reach +/-0.05 mm

And then, the bottom plate is output to a thermoplastic bottom side film laying unit, the thermoplastic bottom side film which is pre-cut or synchronously cut after being subjected to righting and positioning is transplanted to the surface of the bottom plate by a carrying hand, and the transplanting comprises negative pressure adsorption, traction and other implementation modes. After the laying is finished, the center coincidence of the bottom plate and the thermoplastic bottom side film is met, and the poor manufacturing process caused by laying deflection is avoided.

When the gluing end lead process is adopted, the mechanical arm preferentially lays a pre-coating conductive lead, and then a solar cell and another lead are sequentially laid until a battery string with effective connection output is provided. The conductive top plate packaging mode is adopted, the packaging mode comprises a battery piece array, a main grid line and a back surface contain a confluence or bypass welding plate, namely, the battery piece position of the laminated assembly comprises batteries with various specifications, and a solar battery piece with the welding plate specification can be laid at the lamination designated position according to the bypass design.

After the laying is finished, the whole body is conveyed to the next station for confluence treatment, a metal confluence belt is adopted to finish confluence connection by precoating a conductive adhesive or heating a laser designated area, and the plate type bypass protection device is treated in the same way. After the confluence and bypass protection connection processing is completed, the rear glue film, the rear cover plate and the outgoing line are laid for processing, conductive media such as conductive glue, tin paste and the like are pre-coated on the circuit pad connecting point of the rear cover plate on the newly-added independent station for the stacking and arranging integrated conductive top plate, and the coating mode comprises glue spraying and printing. Realize laminating through equipment is automatic to be connected and switch on, need lay the top side membrane and the completion is punched a hole to the region in cutting or synchronous tensile cutting to the top side membrane assigned position in advance to the battery cluster surface before the laminating action takes place to conductive medium can effectively connect battery piece and roof circuit pad.

The lamination part with the conductive connection function is detected to be qualified through EL (electroluminescence) and VI (visual appearance), and then enters a lamination process, wherein the lamination process comprises three-cavity lamination. The lamination process is combined with a new interconnection structure, the vacuum pumping, heating and pressurizing are carried out in a closed cavity, so that the thermoplastic bottom side film is completely thermally cured, the laminated tile assembly is tightly attached, and finally, a complete structural member is laminated, and the positive and negative electrodes of the front and rear solar cells in the structural member form good physical contact so as to realize electric conduction. And then, after the laminating process is finished, the laminated part is subjected to framing, junction box curing, cleaning, safety test, power test, EL test, finished product inspection and other procedures to finish the machining of the final finished laminated assembly.

Additionally, as previously described, in other embodiments not shown, the top TPO membrane may be heated to a hot melt state in contact with the array of cells, and the array of cells is fixed relative to the top TPO after the hot melt region has cooled. For example, the heat of the solar cell sheet from the previous process can be used, and if the lamination speed is fast enough, the solar cell sheet can be covered with the top TPO film when the solar cell sheet is not cooled, and the heat of the solar cell sheet can automatically melt the area on the top of the solar cell sheet; alternatively, a top TPO that has been heated to a hot melt state can be overlaid on the array of battery cells after lamination is complete. Preferably, the top and bottom TPO membranes are heated simultaneously and after cooling, the top, bottom and cell array are secured together.

This embodiment also provides a stack assembly manufactured according to the above method, fig. 2 shows a schematic top surface view of one cell string of the stack assembly manufactured by the above method, and fig. 3 is a schematic view taken along line a-a in fig. 2. It will be appreciated that the stack assembly includes a plurality of cell strings as shown in fig. 2, and that the respective cell strings can be arranged in a cell string array in a direction perpendicular to the first direction D1 on a plane.

Specifically, the stack assembly comprises an encapsulation structure and a solar cell array. The package structure is not shown in the figures, and generally comprises a top plate, a top side film positioned between the top plate and the array of solar cells, and a bottom plate positioned below the thermoplastic bottom side film, wherein the top plate and the bottom plate are of a rigid or flexible weather-resistant monolithic structure with a size larger than that of the array of solar cells. The cell array is located on the top surface of the thermoplastic bottom-side film, the cell array comprises a plurality of cell strings 100 arranged along a certain linear direction, each cell string 100 comprises a plurality of solar cells 1 arranged in a shingled manner along a first direction D1 perpendicular to the linear direction, main grid lines are arranged on the solar cells 1, and any two adjacent solar cells 1 in each cell string 100 are in direct contact through the main grid lines to realize conductive connection.

Wherein each cell string 100 is provided with a top TPO membrane 22 and a bottom TPO membrane 21, the bottom TPO membrane 21 and the top TPO membrane 22 fixing the solar cell sheet 1 thereon by thermal fusion to form the cell string 100.

Specifically, referring to fig. 3, the bus bars are a positive electrode 11 disposed on the top surface of the solar cell sheet 1 and a back electrode 12 disposed on the bottom surface of the solar cell sheet 1. Any two adjacent solar cells 1, the positive electrode 11 of one of them is aligned with and directly contacts the back electrode 12 of the other one to achieve conductive connection. Top and

bottom TPO membranes

22 and 21 are disposed at the top and bottom surfaces of the cell string 100. Wherein, each solar cell slice 1 is fixed between the top TPO membrane 22 and the bottom TPO membrane 21 by the thermal fusion of the top TPO membrane 22 and/or the bottom TPO membrane 21, so that the solar cell slices 1 are also fixed relative to each other. It should be noted that the drawings are schematic, and gaps exist among the top TPO film 22, the bottom TPO film 21, and the solar cell sheet 1 in the drawings, but in fact, each solar cell sheet 1 is tightly adhered to the top TPO film 22 and the bottom TPO film 21, and there is practically no gap between the top TPO film 22 and the bottom TPO film 21 and the solar cell sheet 1.

Preferably, the bottom side film and the top side film of the stack of tiles are also provided in a thermoplastic material. And each cell string 100 is fixed between the top-side film and the bottom-side film by the thermal fusion properties of the thermoplastic top-side film and the thermoplastic bottom-side film.

It can be understood that since the solar cells 1 are electrically connected by direct contact of the bus bars, there is no need to provide a conductive adhesive. Since the solar cells 1 in the cell string 100 are fixed by the thermal fusion property of the top TPO film 22 and/or the bottom TPO film 21, and the solar cells 100 are fixed to each other by the thermal fusion of the thermoplastic bottom-side film and/or the thermoplastic top-side film, an adhesive for fixing the solar cells 1 to each other is also not required.

Various preferred embodiments of the above-described individual components are possible. For example, the solar cell 1 is a crystalline silicon solar cell 1 or a heterojunction solar cell 1; the solar cell sheet 1 is formed into a rectangle, and the length of the solar cell sheet is 2-10 times of the width; the thermoplastic bottom-side film 2 and the thermoplastic top-side film can be of an EVA integral film structure, a POE integral film structure or a silica gel integral film structure; the size of the overlapping portion between the adjacent solar cells 1 of each cell string 100 in the second direction is 0.05mm-5 mm.

In other embodiments, not shown, the busbar of the solar cell sheet, which may be in direct contact with each other, may also have other preferred structures. For example, the positive electrode is intermittently arranged in the extending direction thereof, and the back electrode is continuously arranged in the extending direction thereof; or the positive electrode is continuously arranged in the extending direction of the positive electrode, and the back electrode is discontinuously arranged in the extending direction of the back electrode; or the positive electrode is intermittently arranged in the extending direction thereof, the back electrode is intermittently arranged in the extending direction thereof, and the positive electrode and the back electrode are aligned in the second direction. Preferably, the bus bar is a positive electrode disposed on a top surface of the solar cell sheet and a back electrode disposed on a bottom surface of the solar cell sheet, the positive electrode and the back electrode are each formed in a concave-convex structure, for example, 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.

In addition, a main bus bar and a bypass bus bar can be arranged on the cell array and used for leading out current.

Fig. 4 shows another embodiment according to the invention, fig. 4 being likewise understood as a sectional view taken along the line a-a in fig. 2.

As can be seen from fig. 4, the solar cells 31 are connected with each other in a shingled manner, and the positive electrode 311 and the back electrode 312 are in direct contact with each other to achieve conductive connection. In the present embodiment, the bottom TPO membrane 321 is provided only on the bottom surface of the cell string. In the pre-arrangement step in the manufacturing process, the solar cells 31 are arranged in a cell string on the bottom TPO membrane 321, and are fixed to the bottom TPO membrane 321 by thermal fusion of the bottom TPO membrane 321. In the present embodiment, the pre-arrangement sheet film is not provided on the top surface of the battery string.

Fig. 5 shows a further embodiment according to the invention, fig. 5 likewise being understood to be a sectional view taken along the line a-a in fig. 2.

As can be seen from fig. 5, the solar cells 41 are connected to each other in a shingled manner, and the positive electrode 411 and the back electrode 412 are in direct contact with each other to achieve conductive connection. In this embodiment, only the top surface of the cell string is provided with a top TPO membrane 422. In the pre-arrangement step in the manufacturing process thereof, the respective solar cells 41 are arranged in a cell string and fixed on the bottom surface of the top TPO membrane 422 by thermal fusion of the top TPO membrane 422. In the present embodiment, the pre-arrangement film is not provided on the bottom surface of the battery string.

The utility model provides a scheme can be in arranging the piece in advance in-process through the heating melt characteristic of top TPO membrane and/or end TPO membrane with each solar wafer for each other fixed and form the battery cluster to the heating melt characteristic of thermoplasticity bottom side membrane is fixed each battery cluster on the bottom side membrane, and need not additionally to use the binder. The scheme can combine the typesetting process and the laminating process into a whole, and the battery pieces are directly laminated and typeset on the bottom side packaging material, so that the mode has the advantages of low cost, high efficiency and easy operation. And many problems that may occur due to the conductive paste can be avoided.

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:

battery string 100

Solar cell sheet

1, 31, 41

Positive electrode

11, 311, 411

Back

motor

12, 312, 412

Bottom TPO Membrane

21, 321

Top TPO Membrane

22, 422

Claims

1. A shingle assembly, comprising:

a package structure comprising a bottom side film and a top side film;

a cell array located between and in contact with the top side membrane and the bottom side membrane, the cell array comprising a plurality of cell strings, each cell string comprising:

the solar cell comprises a plurality of solar cells arranged in a shingled manner along a first direction, wherein main grid lines are arranged on the solar cells, and any two adjacent solar cells are in direct contact through the main grid lines to realize conductive connection; and

a pre-arrangement film positioned on the top and/or bottom surfaces of the plurality of solar cells and contacting each solar cell,

wherein the pre-arrangement film is of a monolithic film structure and is capable of fixing the respective solar cell sheets relative thereto by thermal fusion,

2. The shingle assembly of claim 1, wherein the solar cell is a crystalline silicon solar cell or a heterojunction solar cell.

3. The shingle assembly of claim 1, wherein the solar cell sheet is formed in a rectangular shape and has a length of 2 to 10 times its width.

4. The stack assembly of claim 1, wherein the bottom-side membrane and the top-side membrane are EVA monolithic membrane structures, POE monolithic membrane structures, or silicone monolithic membrane structures.

5. The shingle assembly of claim 1, wherein the packaging structure further comprises a top sheet and a bottom sheet underlying the bottom-side film, the top sheet and the bottom sheet being of rigid or flexible weatherable monolithic sheet structure having dimensions larger than the array of battery strings.

6. The shingle assembly of claim 1, wherein the overlap between adjacent solar cells of each of the cell strings has a dimension in the first direction of 0.05mm to 5 mm.

7. The stack assembly of claim 1, wherein the bus bars are a positive electrode disposed on a top surface of the solar cell sheet and a back electrode disposed on a bottom surface of the solar cell sheet, wherein

The positive electrode is intermittently arranged in the extending direction thereof, the back electrode is intermittently arranged in the extending direction thereof, and the positive electrode and the back electrode are aligned in the first direction.

8. The stack assembly according to claim 1, wherein the bus bars are a positive electrode disposed on a top surface of the solar cell sheet and a back electrode disposed on a bottom surface of the solar cell sheet, the positive electrode and the back electrode are each formed in a concavo-convex structure, and when two solar cell sheets are connected in a stack, concave and convex portions of the positive electrode and the back electrode of the two solar cell sheets are engaged with each other.

9. The shingle assembly of claim 8, wherein the positive electrode and the back electrode are formed in a zigzag configuration such that the positive electrode and the back electrode of two solar cells are in contact with each other in a rack-and-pinion fashion when the two solar cells are connected in a shingled manner.

10. The stack of claim 1 wherein the solar cells within the stack comprise a plurality of gauge sizes.

11. The stack of any of claims 1-10, wherein no adhesive is provided within the stack for securing the individual solar cells relative to each other.

12. The stack assembly of any of claims 1-10, wherein the pre-row sheets of membrane are TPO membranes sized to fit the top and bottom surfaces of the cell string.