阅读说明：本技术 一种高效叠层柔性组件及其制备方法 (Efficient laminated flexible assembly and preparation method thereof ) 是由 程晓龙 于 2021-06-10 设计创作，主要内容包括：本发明公开了一种高效叠层柔性组件及其制备方法,包括前板、太阳能电池模组和背板,太阳能电池模组包括叠层电池串和汇流线,叠层电池串为一个或多个,其之间通过汇流线进行串并联；叠层电池串包括切片电池和主栅焊带,切片电池为至少两个,且切片电池之间通过叠层连接结构依次连接,且在首个切片电池的背面主栅和在末尾切片电池的正面主栅上均焊接主栅焊带与汇流线连接,太阳能电池模组通过粘结剂粘接于前板和背板之间,并通过设置在背板上与汇流线连接的连接器进行电气输出；本发明通过切片电池的叠层连接结构,实现切片电池柔性串接的同时,取消了切片电池串接间隙,提高组件效率,并结合主栅焊带在非焊接区域的形状设计,实现更小的弯曲半径。(The invention discloses a high-efficiency laminated flexible assembly and a preparation method thereof, wherein the high-efficiency laminated flexible assembly comprises a front plate, a solar cell module and a back plate, wherein the solar cell module comprises one or more laminated cell strings and bus bars, and the laminated cell strings are connected in series and parallel through the bus bars; the laminated battery string comprises at least two sliced batteries and main grid welding strips, the sliced batteries are sequentially connected through a laminated connection structure, the main grid welding strips are welded on the main grid on the back surface of the first sliced battery and the main grid on the front surface of the last sliced battery and are connected with a bus bar, and the solar battery module is bonded between the front plate and the back plate through a binder and is electrically output through a connector which is arranged on the back plate and is connected with the bus bar; according to the invention, through the laminated connection structure of the sliced battery, flexible serial connection of the sliced battery is realized, meanwhile, serial connection gaps of the sliced battery are eliminated, the assembly efficiency is improved, and in combination with the shape design of the main grid welding belt in a non-welding area, a smaller bending radius is realized.)

1. The utility model provides an efficient stromatolite flexible component, includes front bezel, solar cell module and backplate, the solar cell module pass through the binder bond in between front bezel and the backplate to through setting up carry out electrical output, characterized by with its electrical connection's connector on the backplate: the solar cell module comprises one or more laminated cell strings and bus bars, wherein the laminated cell strings are connected in series and in parallel through the bus bars and then are converged to a designed position for output;

the laminated cell string comprises solar slice cells and main grid welding strips, the solar slice cells are at least two and adjacent to each other, the slice cells are overlapped and placed, the main grid welding strips are opposite to each other, front main grids and back main grids on the slice cells are connected to form a laminated connection structure, and the main grids are welded on the back main grids of the first slice cells and the front main grids of the tail slice cells to form a laminated connection structure.

And a plurality of bypass diodes are connected in parallel on the laminated cell string, and each bypass diode is correspondingly and electrically connected to two ends of a corresponding number of partial slice cells in the laminated cell string. This number is equal to or less than the number of sliced cells of the laminated cell string.

2. The high efficiency laminated flexible module of claim 1, wherein: the sliced cell is obtained by cutting solar cells with standard specifications, and the cell can be equally cut in different quantities according to the curvature radiuses of different curved surfaces.

3. The high efficiency laminated flexible module of claim 1, wherein: the front main grid is arranged at a position, close to a long edge on one side, of the front of the sliced battery, a front gap is formed between one side edge, close to the long edge, of the front main grid and the long edge, a back main grid is arranged at a position, close to a long edge on the other side, of the back of the sliced battery, and a back gap is formed between one side edge, close to the long edge, of the back main grid and the long edge.

4. The high efficiency laminated flexible assembly of claim 3, wherein: the distance of the back clearance is not less than the superposition width dimension of the two sliced battery stacks and not more than half of the width dimension of the sliced battery.

5. The high efficiency laminated flexible module of claim 1, wherein: the front main grid of one sliced cell and the back main grid of the other sliced cell in the laminated connection structure are distributed on two sides of the main grid welding strip in a staggered mode.

6. The high efficiency laminated flexible module of claim 1, wherein: the main grid welding strip is made of a tinned copper strip or a flexible circuit board, and a non-welding area of the main grid welding strip in the width direction is flat or wrinkled.

7. The high efficiency laminated flexible module of claim 1, wherein: and a plurality of bypass diodes are connected in parallel on the laminated cell string, and each bypass diode is correspondingly and electrically connected to two ends of a corresponding number of partial slice cells in the laminated cell string.

8. A preparation method of a high-efficiency laminated flexible assembly comprises the following steps: step one, placing a sliced battery with the right side facing upwards on a welding table top;

picking up a main grid welding strip, cutting according to the designed length, placing the main grid welding strip on the front main grid of the sliced battery on the welding table top, wherein the placing position of the main grid welding strip is flush with the welding position of the front main grid, and then welding;

turning over the sliced battery subjected to front main grid welding to enable the front of the sliced battery to face downwards, and then placing the sliced battery in a laminated welding area;

turning over the next sliced battery with the front main grid welded to enable the front of the next sliced battery to face downwards, then placing the next sliced battery with the front face upwards on the sliced battery with the prepared previous back face upwards in the stacking welding area to enable the edge of the stacking area of the main grid welding strip of the next sliced battery to be flush with the edge of the stacking area of the previous sliced battery with the back face upwards, and then welding the main grid welding strip and the corresponding position of the back main grid of the previous sliced battery with the back face upwards;

step five, repeating the step one to the step four, welding the next sliced battery which is subjected to front main grid welding on the last sliced battery which is subjected to lamination welding, and repeating the steps until the required laminated battery string is finished;

step six, one or more laminated cell strings are subjected to series-parallel connection confluence through confluence belts, lead wires are led to an output position, bypass diodes are arranged on the laminated cell strings in parallel according to design, and the required solar cell module is completed;

step seven, paving the front plate in a laying area, and laying an adhesive, a solar cell module, the adhesive and a back plate on the front plate in sequence to obtain a pre-lamination assembly;

step eight, conveying the laid pre-laminated assembly into a laminating machine for vacuum hot pressing to obtain a flexible assembly;

and step nine, assembling the connector after the obtained flexible assembly is processed and tested to be qualified.

9. The method of making a high efficiency laminated flexible component of claim 8, wherein: the sliced cell is obtained by cutting solar cells with standard specifications, and the solar cells can be equally cut in different quantities according to the curvature radiuses of different curved surfaces.

10. The method of making a high efficiency laminated flexible component of claim 8, wherein: the main grid welding strip is made of a tinned copper strip or a flexible circuit board, and a non-welding area of the main grid welding strip in the width direction is flat or wrinkled.

Technical Field

The invention relates to the technical field of flexible solar cells, in particular to an efficient laminated flexible assembly.

Background

The core difference of different technologies lies in the difference of the solar cell modules, wherein the technologies of the solar cell modules comprise flexible thin film solar cells, thinned silicon wafer series welding, common silicon wafer equal-section series welding, MWT back contact cell series welding, IBC back contact cell series welding, shingled conductive adhesive laminated welding and the like, and the flexible solar cell module can be manufactured by using one or two or more composite technologies, but the thin film solar cell is low in conversion efficiency or high in cost in manufacturing and using; the conductive adhesive tile stacking technology has high cost, and can only carry out small-amplitude bending; series gaps exist in MWT back contact battery series welding and IBC back contact battery series welding technologies, cost is high, thinned silicon wafers are in series welding, series gaps exist in common silicon wafer equal-division slice series welding, and assembly efficiency is low.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the slice battery is flexibly connected in series through the laminated connection structure of the slice battery, meanwhile, the slice battery series connection gap is eliminated, the assembly efficiency is improved, and the efficient laminated flexible assembly with smaller bending radius is realized by combining the shape design of the main grid welding strip in a non-welding area.

In order to solve the above technical problems, one technical solution adopted by the present invention is to provide a high-efficiency laminated flexible assembly, which includes a front plate, a solar cell module and a back plate, wherein the solar cell module is bonded between the front plate and the back plate through a bonding agent, and performs electrical output through a connector disposed on the back plate and electrically connected to the back plate, and the high-efficiency laminated flexible assembly is characterized in that: the solar cell module comprises one or more laminated cell strings and bus bars, wherein the laminated cell strings are connected in series and in parallel through the bus bars and then are converged to a designed position for output;

the laminated cell string comprises solar slice cells and main grid welding strips, the solar slice cells are at least two and adjacent to each other, the slice cells are overlapped and placed, the main grid welding strips are opposite to each other, front main grids and back main grids on the slice cells are connected to form a laminated connection structure, and the main grids are welded on the back main grids of the first slice cells and the front main grids of the tail slice cells to form a laminated connection structure.

Furthermore, a plurality of bypass diodes are connected in parallel to the stacked cell string, and each bypass diode is correspondingly and electrically connected to two ends of a corresponding number of partial slice cells in the stacked cell string.

Furthermore, the sliced battery is obtained by cutting the solar battery slices with standard specifications, and the battery slices can be equally cut in different quantities according to the curvature radiuses of different curved surfaces.

Furthermore, the front main grid is arranged at a position, close to the long edge of one side, of the front of the sliced battery, a front gap is formed between one side edge, close to the long edge, of the front main grid and the long edge, the back main grid is arranged at a position, close to the long edge of the other side, of the back of the sliced battery, and a back gap is formed between one side edge, close to the long edge, of the back main grid and the long edge.

Further, the distance of the back gap is not less than the overlapped width dimension of the two sliced battery stacks and not more than half of the width dimension of the sliced battery.

Furthermore, the front main grid of one sliced cell and the back main grid of the other sliced cell in the laminated connection structure are distributed on two sides of the main grid welding strip in a staggered mode.

Furthermore, the main grid welding strip is made of a tinned copper strip or a flexible circuit board, and a non-welding area of the main grid welding strip in the width direction is flat or wrinkled.

In order to solve the above technical problem, another technical solution adopted by the present application is: the preparation method of the high-efficiency laminated flexible assembly is provided, and comprises the following steps: step one, placing a sliced battery with the right side facing upwards on a welding table top;

picking up a main grid welding strip, cutting according to the designed length, placing the main grid welding strip on the front main grid of the sliced battery on the welding table top, wherein the placing position of the main grid welding strip is flush with the welding position of the front main grid, and then welding;

turning over the sliced battery subjected to front main grid welding to enable the front of the sliced battery to face downwards, and then placing the sliced battery in a laminated welding area;

turning over the next sliced battery with the front main grid welded to enable the front of the next sliced battery to face downwards, then placing the next sliced battery with the front face upwards on the sliced battery with the prepared previous back face upwards in the stacking welding area to enable the edge of the stacking area of the main grid welding strip of the next sliced battery to be flush with the edge of the stacking area of the previous sliced battery with the back face upwards, and then welding the main grid welding strip and the corresponding position of the back main grid of the previous sliced battery with the back face upwards;

step five, repeating the step one to the step four, welding the next sliced battery which is subjected to front main grid welding on the last sliced battery which is subjected to lamination welding, and repeating the steps until the required laminated battery string is finished;

step six, one or more laminated cell strings are subjected to series-parallel connection confluence through confluence belts, lead wires are led to an output position, bypass diodes are arranged on the laminated cell strings in parallel according to design, and the required solar cell module is completed;

step seven, paving the front plate in a laying area, and laying an adhesive, a solar cell module, the adhesive and a back plate on the front plate in sequence to obtain a pre-lamination assembly;

step eight, conveying the laid pre-laminated assembly into a laminating machine for vacuum hot pressing to obtain a flexible assembly;

and step nine, assembling the connector after the obtained flexible assembly is processed and tested to be qualified.

Further, the laminator parameters are configured to: the temperature is 130-160 ℃, the vacuumizing is carried out for 3-8 minutes, wherein the pressure setting is gradually carried out in three steps, and the specific pressure parameters are as follows: the first section is-90 KPa to-70 KPa,10 seconds to 300 seconds; the second section is-50 KPa to-20 KPa,10 seconds to 300 seconds; the third stage is-10 KPa to 0KPa,600 seconds to 1200 seconds.

Furthermore, the sliced battery is obtained by cutting the solar battery slices with standard specifications, and the battery slices can be equally cut in different quantities according to the curvature radiuses of different curved surfaces.

Furthermore, the main grid welding strip is made of a tinned copper strip or a flexible circuit board, and a non-welding area of the main grid welding strip in the width direction is flat or wrinkled.

The invention has the beneficial effects that:

the invention designs a laminated connection structure of sliced batteries, which enables the front main grid of one sliced battery and the back main grid of another sliced battery to be staggered in position in a laminated state, and then the main grid welding belts are respectively welded, thereby realizing flexible serial connection of the sliced batteries, eliminating serial connection gaps of battery pieces and improving assembly efficiency; the tin-plated copper or the flexible circuit board strip is used for replacing conductive adhesive used in the prior art, so that the assembly cost is greatly reduced, and the production yield is improved; according to different product requirements, the smaller cut-into-slice battery with equal cutting size can realize smaller bending radius by combining with the shape design of the non-welding area of the main grid welding strip in the width direction.

Drawings

FIG. 1 is a schematic structural view of a high efficiency laminated flexible assembly;

FIG. 2 is a schematic view of a solar cell module;

FIG. 3 is a schematic view of a sliced cell structure;

FIG. 4 is a schematic view of a laminate connecting structure;

FIG. 5 is a schematic diagram of a tandem cell string configuration;

fig. 6 is a schematic diagram of a series-parallel structure of a tandem cell string;

FIG. 7 is a flow chart of a method for making a high efficiency laminated flexible component.

Detailed Description

Example (b): referring to fig. 1, 2, 3, 4, 5, 6 and 7, in which 1-solar cell module, 2-adhesive, 3-front sheet, 4-back sheet, 5-connector; 100-sliced cells, 1001-front main grid, 1002-back main grid, 11-stacked cell string, 110-main grid solder strip, 120-bus bar.

The invention discloses a high-efficiency laminated flexible assembly and a preparation method thereof, and the high-efficiency laminated flexible assembly comprises a front plate, a solar cell module and a back plate, wherein the solar cell module comprises one or more laminated cell strings and bus bars, the laminated cell strings are connected in series and parallel through the bus bars and output to a designed position, each laminated cell string comprises at least two sliced cells and main grid welding strips, the two adjacent sliced cells are connected with each other through a laminated connection structure, the main grid welding strips are welded on a back main grid of a first sliced cell and a front main grid of a last sliced cell and connected with the bus bars, and the solar cell module is bonded between the front plate and the back plate through a binder and is electrically output through a connector which is arranged on the back plate and electrically connected with the solar cell module; through the laminated connection structure of the sliced battery, flexible serial connection of the sliced battery is realized, meanwhile, serial connection gaps of the sliced battery are eliminated, assembly efficiency is improved, and smaller bending radius is realized by combining the shape design of the main grid welding belt in a non-welding area.

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic view of a high-efficiency laminated flexible module provided by the present application, including a front plate 3, an adhesive 2, a solar cell module 1, an adhesive 2, a back plate 4, and a connector 5.

The front plate 3 includes a light receiving surface and a backlight surface, and has good light transmittance. When the solar cell is used, sunlight penetrates through the front plate and reaches the solar cell. In some embodiments, the front plate is made of a material with high water vapor barrier property and excellent weather resistance, such as a flexible polymer composite film, preferably polytetrafluoroethylene, and may also be a polymer material, such as a glass fiber organic composite material/PC/PMMA/PVC, without being limited thereto.

The adhesive 2 is a high-weatherability polymer material. The adhesive is used for bonding a front plate, a solar cell module, and a back plate, and filling a gap between the two layers to form a reliable internal structure, and may be ethylene-vinyl acetate copolymer (EVA), Polyolefin elastomer (POE), polyvinyl butyral (PVB), or 2,4,6-trimethylbenzoyl diphenyl phosphine oxide (TPO,2,4,6-trimethylbenzoyl diphenyl phosphine oxide), and the Polyolefin elastomer (POE) is preferably a high polymer of ethylene and butene or a high polymer of ethylene and octene, but is not limited thereto.

Referring to fig. 2, fig. 2 is a schematic diagram of a solar cell module provided by the present application, including a solar sliced cell 100, a main grid bonding strip 110, a stacked cell string 11, and a bus line 120.

The sliced battery 100 is obtained by cutting a solar battery piece with a standard specification, and the battery piece can be equally cut in different numbers according to the curvature radius of different curved surfaces. The sliced cell can be a one-half slice, a one-third slice, a one-fourth slice, a one-fifth slice, a one-sixth slice, or a one-tenth slice cell, and can be other sizes of sliced cells. The solar cell used can be a polycrystalline silicon solar cell, a monocrystalline silicon solar cell, an HIT heterojunction solar cell and the like.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a sliced battery provided in the present application; a front main grid 1001 is arranged at a position of the front of the sliced battery 100 close to the long edge of one side, wherein the gap distance between the edge of one side of the front main grid close to the long edge and the edge of the long edge is preferably 0.01mm-0.5 mm. The front main grid width value is 0.01mm-2mm, preferably 0.1mm-1.0 mm. And a back main grid 1002 is arranged at the position, close to the long edge of the other side, of the back of the sliced battery, wherein the gap distance between the edge of one side, close to the long edge, of the back main grid and the edge of the long edge is not less than the overlapping width dimension of the lamination and not more than 50% of the width dimension of the sliced battery, and preferably 2mm-8 mm. The width value of the back main grid is 0.01mm-8mm, preferably 0.1mm-5 mm.

The material of the main grid welding strip 110 is a tinned copper strip or a flexible circuit board, and the thickness of the main grid welding strip is 0.02mm-0.5mm, preferably 0.05mm-0.15 mm. The width of the main grid welding strip is determined according to the current passing capacity of the sliced battery, and generally can be 0.1mm-10mm, and preferably 0.3mm-5 mm. The length of the main grid welding strip is not more than the length of the sliced battery, and the application is not limited. The non-welding area of the main grid welding strip in the width direction is flat or wrinkled (arc-shaped, wavy, zigzag or V-shaped).

Referring to fig. 4, fig. 4 is a schematic view of a stacked connection structure provided in the present application; the stacked connection structure in the stacked battery string 11 is that two adjacent sliced batteries 100 are overlapped, a main grid welding strip 110 is arranged between the two sliced batteries 100, one side of the main grid welding strip 110 is connected with a front main grid 1001 on one sliced battery 100, and the other side of the main grid welding strip 110 is connected with a back main grid 1002 on the other sliced battery 100. The front main grids 1001 of one sliced cell 100 and the back main grids 1002 of another sliced cell 100 in the laminated connection structure are distributed on two sides of the main grid solder strip 110 in a staggered mode.

Referring to fig. 5, fig. 5 is a schematic diagram of a stacked cell string provided in the present application; the laminated battery string 11 is formed by connecting two or more sliced batteries in series, and every two adjacent sliced batteries 100 are connected in a laminated connection structure. The main grid solder strip 110 is soldered on the back main grid 1002 of the first sliced battery 100 of the tandem cell string 11. And a main grid solder strip 110 is welded on the front main grid of the last sliced battery 100. The serial connection number of the sliced batteries 100 on the laminated battery string 11 is designed according to different component specification requirements, so that the method has quite flexible adaptability and can meet the requirements of various customized designs.

The laminated battery string is connected with a plurality of bypass diodes in parallel, and each bypass diode is correspondingly and electrically connected to two ends of a corresponding number of partial slice batteries in the laminated battery string.

Referring to fig. 6, fig. 6 is a schematic diagram of a series-parallel structure of a stacked cell string provided in the present application; the series-parallel structure of the laminated battery strings is output by one or more laminated battery strings 11 through series-parallel confluence to a design position through a confluence belt 120. The series-parallel structure can be designed according to the specification requirements of the components, has quite flexible adaptability, and can meet the requirements of various customized designs. The present application provides a typical series-parallel configuration, but is not limited to the typical configuration.

The back plate 4 is used as the outermost layer structure of the back, can be made of specially processed high polymer materials, and can also be made of glass fiber organic composite materials/PC/PMMA/PVC and the like, has good weather resistance, and effectively ensures the service life of the assembly, but is not limited thereto.

The connector 5 is the core component of the electrical output of the photovoltaic tile. The waterproof grade meets the requirement of IP67, and the connection is reliable.

Referring to fig. 7, fig. 7 is a flow chart of a method for manufacturing the above-mentioned high-efficiency laminated flexible assembly according to the present application; the steps described in fig. 7 are adopted for obtaining the above-mentioned high-efficiency laminated flexible assembly, and in fig. 7, the steps comprise:

a first step S1 of placing a sliced battery 100 right side up on a welding table;

a second step S2, picking up the main grid welding strip 110, cutting according to the designed length, then placing the main grid welding strip on the front main grid 1001 of the sliced battery 100 on the welding table top, wherein the placing position of the main grid welding strip is flush with the welding position of the front main grid 1001, and then welding;

a third step S3 of turning the diced cell 100, on which the front-side main grid 1001 is soldered, upside down and then placing it in the stack bonding area;

a fourth step S4, turning over the next sliced battery 100 which is welded with the front main grid 1001 to enable the front side of the next sliced battery to face downwards, then placing the next sliced battery 100 which is prepared in the lamination welding area and has the back side facing upwards on the previous sliced battery 100 to enable the edge of the lamination area of the main grid welding strip 110 of the next sliced battery to be flush with the edge of the lamination area of the previous sliced battery 100 with the back side facing upwards, and then welding the main grid welding strip 110 and the position corresponding to the back main grid 1002 of the previous sliced battery 100 with the back side facing upwards;

a fifth step S5 of repeating S1 to S4, welding the next sliced battery 100 on which the front main grid 1001 welding has been completed to the last sliced battery 100 on which the laminate welding has been completed, and so on until the desired laminate battery string is completed;

a sixth step S6, carrying out series-parallel connection and confluence on one or more laminated cell strings 11 through a confluence belt 120, leading wires to an output position, and arranging bypass diodes in parallel on each laminated cell string according to design to complete the required solar cell module 1;

a seventh step S7 of laying the front plate 3 in the laying area, and laying the adhesive 21, the solar cell module 1, the adhesive 22, and the back sheet 4 on the front plate 3 in order to obtain a pre-laminated assembly;

an eighth step S8, conveying the laid pre-laminated assembly into a laminating machine for vacuum hot pressing to obtain a flexible assembly;

a ninth step S9, assembling the connector 5 after the obtained flexible member is processed and tested to be qualified.

Wherein the parallel design of the bypass diodes is: each bypass diode pair is electrically connected across a corresponding number of partially sliced cells in the string of stacked cells.

Wherein, the parameters of the laminating machine are set as follows: the temperature is 130-160 ℃, the vacuumizing is carried out for 3-8 minutes, wherein the pressure setting is gradually carried out in three steps, and the specific pressure parameters are as follows: the first section is-90 KPa to-70 KPa,10 seconds to 300 seconds; the second section is-50 KPa to-20 KPa,10 seconds to 300 seconds; the third stage is-10 KPa to 0KPa,600 seconds to 1200 seconds.

Wherein, the specific process of processing and testing the obtained flexible assembly comprises the following steps: trimming, insulation and voltage resistance testing and IV performance testing.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.