WO2018120536A1

WO2018120536A1 - Photovoltaic assembly and encapsulation method therefor

Info

Publication number: WO2018120536A1
Application number: PCT/CN2017/081709
Authority: WO
Inventors: 宋华辉; 黄俊哲; 刘洪明; 李阳; 王乃明; 覃武; 覃冬梅; 胡杰
Original assignee: 珠海格力电器股份有限公司
Priority date: 2016-12-28
Filing date: 2017-04-24
Publication date: 2018-07-05
Also published as: CN106847967B; CN106847967A

Abstract

Provided is a photovoltaic assembly, comprising: a front plate (100), a back plate (200) and a battery assembly (300). The battery assembly is fixed in a sealing cavity formed by the front plate and the back plate; the battery assembly comprises at least one battery string (310), and two or more battery strings are arranged in parallel and at intervals in the sealing cavity. In the photovoltaic assembly, between the battery assembly and the front plate or the back plate is a separable-type contact, and between the battery strings in the battery assembly are also separable-type connections. When a problem occurs in a certain battery unit in a battery string, or in the front plate or the rear plate, it can be replaced individually, and other materials without problems can continue to be used, thereby fully utilizing the still usable battery units and raw materials in the assembly, reducing wastage of resources, realizing the valuation of production energy consumption, and reducing the overall production cost of the assembly. Further provided is an encapsulation method for the photovoltaic assembly.

Description

Photovoltaic module and packaging method of the same

Related application

The present application claims the benefit of priority to the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the present disclosure.

Technical field

The present invention relates to the technical field of the photovoltaic industry, and in particular to a photovoltaic module and a packaging method of the photovoltaic component.

Background technique

The existing crystalline silicon photovoltaic modules are all of the structure of "front plate + adhesive film + several battery sheets (the number of battery sheets required for the entire assembly) + adhesive film + back sheet". Generally, a crystalline silicon photovoltaic module is composed of 60 pieces or 72 pieces of individual cells in series. Taking a component of 60 batteries as an example, 10 pieces of cells are connected in series to form a battery string, 6 sets of battery strings are connected in series, and then the whole layer is glued. Glue film. The adhesive film plays two main roles in the assembly: first bonding the battery sheet and the front and back sheet materials, and secondly isolating the battery sheet from the outside water vapor.

According to the above sequence, the raw material layer is laid. If any problem is found in the battery piece, the front plate or the back plate at this time, the problematic part can be separately removed and replaced. After the lamination process is completed after a certain temperature, the adhesive film is cross-linked, and the front plate, the battery sheet and the back sheet are bonded as a whole, and the front plate, the bonding material, the battery string and the back plate are completely inseparable. . Although the EL test (electroluminescence test, used to detect internal defects, cracks, debris, solder joints, broken gates, and different conversion efficiency monolithic cell anomalies) of the solar cell module before lamination ensures that the cell is not broken and Cracking phenomenon, but due to the small toughness of the battery sheet, the crushing of a certain battery sheet often occurs during the lamination process under vacuum and pressure, and the front plate and the back plate may also be chipped when laminated. At this time, the battery piece, the bonding material, and the front plate and the back plate are completely bonded together, and the battery piece and the front plate and the back plate are not replaceable. The fragmentation of a certain battery piece affects the electrical performance of the component and the aesthetic appearance of the component to some extent, so the overall photovoltaic component after lamination may not be utilized due to problems of a certain cell sheet or front plate or back plate. As a result, waste of other cells and front and back plates on the component is not generated, and the corresponding production energy consumption does not create value. In the process of using the subsequent components, the whole component is often unavailable due to problems in one of the battery sheets or the front plate and the back plate. However, the recycling industry of the photovoltaic components is not perfect, resulting in a large amount of waste of resources.

Summary of the invention

Based on this, it is necessary to provide a photovoltaic module and a packaging method of the photovoltaic module for the problem that the entire photovoltaic module is not available due to a problem of a certain cell or front plate or back plate.

The above objectives are achieved by the following embodiments:

A photovoltaic module comprising: a front plate, a back plate and a battery assembly; the battery assembly is fixed in a sealed cavity formed by the front plate and the back plate; the battery assembly includes at least one battery string formed by connecting the battery sheets, two or more The battery strings are arranged in parallel in the sealed cavity.

In one of the embodiments, the battery string includes a plurality of battery cells connected in series, the battery strings are wrapped with a sealing structure for isolating the battery strings from the outside.

In one embodiment, the sealing structure comprises a first adhesive film layer and a second adhesive film layer, the battery string is disposed between the first adhesive film layer and the second adhesive film layer, the first adhesive film layer, the battery string and the first The two film layers are laminated to form a unitary body.

In one embodiment, the front panel includes a vertically connected bottom panel and an edge panel, the edge panel extending circumferentially along the edge of the bottom panel; the edge panel is provided with a fixing structure at one end away from the bottom panel, and the fixing structure is used to fix the back panel.

In one of the embodiments, the fixed structure includes an annular groove that forms a stepped structure with the edge plate for engaging the backing plate.

In one of the embodiments, a side of the backing plate away from the front panel is flush with an end of the edge panel away from the bottom panel.

A method of packaging a photovoltaic module, comprising the steps of:

The battery assembly is placed between the front plate and the back plate, and the front plate and the back plate are sealed to each other.

In one of the embodiments, before the step of placing the battery assembly between the front plate and the back plate, the plurality of battery pieces are connected in series to form a battery string via the interconnecting strip, and the battery string is placed on the first film layer and the first The two film layers are laminated to form a whole.

In one of the embodiments, after the step of laminating the battery string between the first film layer and the second film layer to form a unitary body, two or more battery strings are connected in series through the bus bar to form the battery assembly.

In one embodiment, the material of the first film layer or the second film layer is any one of the following materials: EVA, POE, liquid silicone.

In one of the embodiments, the thickness of the front or back panel is from 2 mm to 3.5 mm.

The above photovoltaic module, the battery assembly including at least one battery string is fixed in a sealed cavity formed by the front plate and the back plate, the battery assembly is in detachable contact with the front plate or the back plate, and the battery string and the battery string in the battery assembly It is also a detachable connection. When there is a problem with the battery in a battery string, or when there is a problem with the front and rear panels, it can be replaced separately, and other materials without problems can continue to be used. The battery chips and raw materials that can still be used in the components reduce waste of resources, fully realize the value of production energy consumption, and reduce the overall production cost of the components.

The packaging method of the above photovoltaic module is different from the traditional packaging method of the photovoltaic component. The adhesive film cross-linking reaction only covers the battery string, and the wrapped battery string is placed between the front plate and the back plate material, that is, the package is packaged. The covered battery string is non-bonded and detachable in contact with the front and back plates. When a battery string or front plate and back plate materials have problems, they can be replaced. Continue to use other available parts of raw materials to reduce raw materials. Waste; the battery string is made up of a series of cells connected in series and crosslinked Should form a whole, when a battery has a problem, only need to replace the battery string where the battery is located, other battery strings can continue to use, reducing the waste of the battery and reducing the overall cost of the component.

In addition, in the packaging method, the front plate and the back plate are not subjected to the laminating process, and the breaking phenomenon of the front plate and the back plate during the laminating process is correspondingly avoided, and the yield of the assembly is improved.

DRAWINGS

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

1 is a front elevational view of a photovoltaic module according to an embodiment of the present invention;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

3 is a schematic diagram of a packaged battery string of a photovoltaic module according to an embodiment of the present invention;

4 is a schematic diagram of a battery string and a sealing structure of a photovoltaic module according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for packaging a photovoltaic module according to an embodiment of the present invention.

In the figure: 100-front plate; 110-base plate; 120-edge plate; 121-step structure; 200-back plate; 300-battery assembly; 310-battery string; 311-battery sheet; 320-seal structure; a film layer; 322 - a second film layer.

detailed description

In order to make the objects, technical solutions and advantages of the present invention more clear, the photovoltaic module and the packaging method of the photovoltaic module of the present invention will be further described in detail below through the embodiments and the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and the like, as used herein, are for illustrative purposes only.

As shown in FIG. 1 to FIG. 3, a photovoltaic module according to an embodiment of the present invention includes: a front plate 100, a back plate 200, and a battery assembly 300; the battery assembly 300 is fixed in a sealed cavity formed by the front plate 100 and the back plate 200. The battery assembly 300 includes at least one battery string 310 formed by connection of battery sheets, and two or more battery strings 310 are arranged in parallel in the sealed cavity.

The front plate 100 is usually a tempered coated glass, and the back plate 200 is a TPT back plate 200 or an ordinary tempered glass. The front plate 100 may have a thickness of 2 mm to 3.5 mm, and the back plate 200 may have a thickness of 2 mm to 3.5 mm. The front plate 100 and the back plate 200 may be sealed by a sealing strip or sealed by a sealing silicone to provide electricity between the two. The pool assembly 300 is isolated from external moisture.

Further, the battery string 310 is wrapped with a sealing structure 320 for isolating the battery string 310 from the outside, thereby further ensuring isolation of the battery string 310 from external moisture, and preferably ensuring stability and long-term use of the photovoltaic module. Sex.

4, the battery string 310 includes a plurality of battery sheets 311 which are connected in series by interconnecting strips and are wrapped with a sealing structure 320. The sealing structure 320 further seals the battery sheets 311 while fixing the battery sheets 311. The sealing structure 320 may have various structural forms. Preferably, the sealing structure 320 includes a first adhesive film layer 321 and a second adhesive film layer 322. The battery string 310 is disposed on the first adhesive film layer 321 and the second adhesive film layer 322. Between the first film layer 321, the battery string 310 and the second film layer 322 are laminated to form a unitary body. Of course, the sealing structure 320 can also adopt other structures, and is not limited to the film layer covering structure of the embodiment, as long as the sealing and fixing of the battery string 310 can be realized.

The material of the first adhesive film layer 321 or the second adhesive film layer 322 may be a battery string 310 by using EVA (ethylene-vinyl acetate copolymer, a plastic raw material), POE (polyolefin elastomer) or liquid silicone. Between the first adhesive film layer 321 and the second adhesive film layer 322, and then lamination, the first adhesive film layer 321 and the second adhesive film layer 322 undergo a crosslinking reaction to coat the battery string 310, the battery string 310 and the glue The film is bonded as a whole, that is, as a separate battery string 310, a certain number of individual battery strings 310 are placed between the front plate 100 and the back plate 200, preferably, the battery string 310 and the battery string 310 The spacing between the two is about 3 mm to 4 mm, and the battery assembly 300 is formed by connecting the battery strings 310 in series with the bus bar, and the front plate 100 and the back plate 200 are fixedly sealed to finally form a photovoltaic module.

In order to ensure that the battery string 310 is completely covered by the film, the area of the first film layer 321 or the second film layer 322 is larger than the area of the battery string 310, in other words, the first film layer 321 and the second film layer 322. After the crosslinking reaction occurs, the periphery of the battery string 310 wrapped therein has a certain distance along the periphery of the adhesive film, and the distance is about 5 mm to 10 mm.

In the photovoltaic module of the embodiment of the present invention, between the battery string 310 and the battery string 310, the battery string 310 and the front panel 100 or the back panel 200 are independently separable, and any problem may be replaced, and the other is not The raw materials with problems can continue to be used. Therefore, it is possible to make full use of the battery sheets and raw materials that can still be used in the components, reduce waste of resources, fully realize the value of production energy consumption, and reduce the overall production cost of the components.

Referring to FIGS. 1 and 2, as a preferred embodiment, the front panel 100 includes a vertically connected bottom plate 110 and an edge plate 120. The edge plate 120 extends circumferentially along the edge of the bottom plate 110; the edge plate 120 is away from the end of the bottom plate 110. A fixed structure for fixing the back plate is provided.

Preferably, the fixing structure includes an annular groove, and the annular groove and the edge plate 120 form a step structure 121 for engaging the back plate 200. Thus, the backing plate 200 is embedded in the front panel 100 by the step structure 121, and the front panel 100 and the back panel 200 can form a sealed cavity for fixedly mounting the battery assembly 300. Of course, the fixing structure may also be other structural forms. For example, the fixing structure includes a slot and a rib, and the slot may be disposed on an inner circumferential surface of the edge plate 120 away from the end of the bottom plate 110, the length of the slot. The height of the edge plate is smaller than the height of the edge plate, and the corresponding groove of the rib is disposed on the outer circumferential surface of the back plate 200. The back plate 200 is fixed to the front plate 100 by using the rib insertion slot.

The front panel 100 of the present embodiment is different from the planar structure of the conventional front panel. The front panel 100 includes a bottom panel 110 and a circumferentially surrounding edge panel 120, and an annular groove is formed at an end of the edge panel 120 away from the bottom panel 110. The step structure 121 of the back plate 200 is clamped. When the back plate 200 is fixed on the front plate 100 by the step structure 121, the back plate 200 and the edge plate 120 are in a seamless contact manner, that is, the size and shape of the back plate 200 and the circumferential surface size and shape of the annular groove. Adapting, so as to ensure that the backboard 200 is better mounted on the front panel 100 and can be snap-fitted, and at the same time sealing the interface between the front panel 100 and the backboard 200 by sealing tape or the like to further insulate moisture from entering the front panel. 100 is formed in the cavity formed by the backing plate 200.

It can be understood that there is a certain interval between the back plate 200 and the bottom plate 110 of the front plate 100. The space is used for laying the battery string 310 covered by the sealed structure 320. After the battery string 310 is laid, the back plate is laid. The 200 is fixed to the front panel 100. In order to ensure the overall consistency of the photovoltaic module, it is convenient to seal with the sealing tape, and the back plate 200 can be completely integrated with the front plate 100 in appearance, that is, the back plate 200 is away from one side of the front plate 100 and the edge plate 120 is away from the bottom plate 110. One end is flush so that the backing plate 200 is completely embedded in the front panel 100.

Specifically, the front plate 100 has a thickness of 2 mm to 3.5 mm, the back plate 200 has a thickness of 2 mm to 3.5 mm, and the edge plate 120 has a height of 4 mm to 5 mm, that is, between the bottom plate 110 of the front plate 100 and the back plate 200. The interval is about 1.5 mm to 2 mm. Thus, when the packaged battery string 310 is placed in the package of the back plate 200 and the front plate 100, the back plate 200 has a certain pressing force on the battery string 310, and the battery is added. The friction between the outer film of the string 310 and the front plate 100 and the back plate 200 enables the battery string 310 to be relatively stably fixed in the sealed cavity formed by the front plate 100 and the back plate 200.

In order to further position the battery strings 310 arranged on the front panel 100, a plurality of ribs may be disposed in parallel on the bottom plate 110, the battery strings 310 are placed between adjacent ribs, and the ribs and edge plates 120 are disposed. Between, the battery string 310 is effectively fixed.

Of course, the front panel 100 and the back panel 200 are not limited to the above structure, and the back panel 200 has a bottom panel and an edge panel structure. The front panel 100 is embedded in the step structure of the edge panel of the back panel 200 to implement the front panel 100. It is fixed to the back plate 200, or other structure capable of mounting and fixing the front plate 100 and the back plate 200 and forming a sealed cavity therebetween.

Referring to FIG. 5, an embodiment of the present invention further provides a method for packaging a photovoltaic module, including:

Step S300: placing the battery assembly between the front plate and the back plate, and the front plate and the back plate are sealed and fixed to each other.

The front plate and the back plate are the front plate 100 and the back plate 200 in the above embodiment, the front plate is usually tempered coated glass, the back plate is made of TPT back plate or ordinary tempered glass, and the thickness of the front plate or the back plate is 2 mm. ~3.5mm. The interface between the front plate and the back plate may be sealed by a sealing strip or sealed by a sealing silicone, and the battery assembly is placed in a sealed cavity formed by the front plate and the back plate.

Specifically, the battery assembly is laid flat on the bottom plate of the front plate, and then the back plate is fixed and fixed to the front plate through the step structure. Finally, the interface between the front plate and the back plate is sealed with a sealing tape to form a photovoltaic module.

Further, before step S300, the method further includes step S100: connecting a plurality of battery sheets into a battery string in series via the interconnecting strip, and placing the battery string between the first adhesive film layer and the second adhesive film layer to form a whole. .

The material of the first film layer or the second film layer may be EVA, POE or liquid silicone or the like. After the high-temperature vacuum lamination process, the first film layer and the second film layer are cross-linked, and the battery strings are completely coated to form a whole.

Still further, after step S100, step S200 is included: two or more battery strings are connected in series through the bus bar to form the battery assembly. It should be noted that the battery string here is a battery string completely covered by the film layer, and two or more battery strings are connected in series via the bus bar to form the battery assembly in step S300.

The packaging method of the photovoltaic module of the embodiment of the invention can remove the sealing tape of the front and back interface joints regardless of the problem of a certain battery string or the damage of the front plate and the back plate material, and only replace the problematic one. Group battery strings or damaged front and back plates, and continue to use other available parts of raw materials to reduce raw material waste. In addition, in the packaging method, the front plate and the back plate are not subjected to the laminating process, and the breaking phenomenon of the front plate and the back plate during the laminating process is correspondingly avoided, and the yield of the assembly is improved.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A photovoltaic module, comprising: a front plate (100), a back plate (200), and a battery assembly (300); the battery assembly (300) is fixed to the front plate (100) and the back plate (200) formed in the sealed cavity;

The battery assembly (300) includes at least one battery string (310) formed by a cell sheet connection in which two or more of the battery strings (310) are arranged in parallel spaced apart.
The photovoltaic module according to claim 1, wherein said battery string (310) comprises a plurality of battery cells (311) connected in series, said battery string (310) being externally wrapped with a sealing structure (320), said A sealing structure (320) is used to isolate the battery string (310) from the exterior.
The photovoltaic module according to claim 2, wherein the sealing structure (320) comprises a first adhesive film layer (321) and a second adhesive film layer (322), and the battery string (310) is disposed at the Between the first film layer (321) and the second film layer (322), the first film layer (321), the battery string (310) and the second film layer ( 322) laminated to form a unitary body.
The photovoltaic module according to any one of claims 1 to 3, wherein the front panel (100) comprises a vertically connected bottom plate (110) and an edge plate (120), the edge plate (120) along The edge of the bottom plate (110) extends circumferentially;

One end of the edge plate (120) away from the bottom plate (110) is provided with a fixing structure for fixing the back plate (200).
The photovoltaic module according to claim 4, wherein the fixing structure comprises an annular groove, and the annular groove forms a step structure with the edge plate (120) for chucking the back plate (200) ( 121).
The photovoltaic module according to claim 4, wherein one side of the back plate (200) away from the front plate (100) and one end of the edge plate (120) away from the bottom plate (110) level.
A method of packaging a photovoltaic module, comprising the steps of:

The battery assembly is placed between the front plate and the back plate, and the front plate and the back plate are sealed to each other.
The method of packaging a photovoltaic module according to claim 7, wherein before the step of placing the battery assembly between the front plate and the back plate, the plurality of battery pieces are connected in series to form a battery string via the interconnecting strip, and The battery string is placed between the first film layer and the second film layer to form a unitary body.
The method of packaging a photovoltaic module according to claim 8, wherein after the step of laminating the battery string between the first film layer and the second film layer to form a whole, two The above battery strings are formed in series by a bus bar to form the battery assembly.
The method of packaging a photovoltaic module according to claim 8, wherein the material of the first adhesive film layer or the second adhesive film layer is any one of the following materials: EVA, POE, liquid silicone.
The method of packaging a photovoltaic module according to any one of claims 7 to 10, wherein the front plate or the back plate has a thickness of 2 mm to 3.5 mm.