CN113097327A - Grid line glue film and solar cell module - Google Patents

Abstract

Translated fromChinese

本发明提供了一种栅线胶膜及太阳能电池组件。一种栅线胶膜，该栅线胶膜包括：基底封装胶膜；电互连层阵列，电互连层阵列的各电互连层设置在基底封装胶膜上，各电互连层包括主栅线部和互连部，主栅线部包括一条或多条主栅线，互连部与各主栅线电连接本申请将主栅线和封装胶膜复合为一体，在对电池封装的同时即可形成电流汇总电路，且利用互连部对主栅线进行电连接，只需要在接线盒和互连部之间设置导线即可，不需要设计复杂的线路结构将主栅线的电流导出。此外，本申请由于封装胶膜与电池片的结合力较强，在封装后胶膜会填满空余部分，从而使主栅线可以与电池片紧密贴合，提高了良率。

The invention provides a grid line adhesive film and a solar cell assembly. A grid line adhesive film, the grid line adhesive film comprising: a base encapsulation adhesive film; an electrical interconnection layer array, each electrical interconnection layer of the electrical interconnection layer array is arranged on the base encapsulation adhesive film, and each electrical interconnection layer comprises The busbar line part and the interconnection part, the busbar line part includes one or more busbar lines, and the interconnection part is electrically connected with each busbar line. At the same time, the current summarizing circuit can be formed, and the interconnection part is used to electrically connect the busbar line, only need to set the wire between the junction box and the interconnection part, and there is no need to design a complex circuit structure to connect the busbar line. Current export. In addition, in the present application, due to the strong bonding force between the encapsulation film and the cell, the film will fill the empty part after encapsulation, so that the busbar can be closely attached to the cell, and the yield is improved.

Description

Grid line glue film and solar cell module

Technical Field

The invention relates to the technical field of photovoltaics, in particular to a grid line adhesive film and a solar cell module.

Background

High efficiency and low cost are always the trend of photovoltaic development. The heterojunction battery has the characteristics of high conversion efficiency, low temperature coefficient, excellent double-sided power generation rate and the like, is suitable for flaking, and is considered to be the next generation ultra-high efficiency battery technology with the most industrialization potential. Meanwhile, the heterojunction battery also has the following problems: 1) the interconnection of the conventional heterojunction battery plates needs to adopt a low-temperature welding process, and the welding reliability needs to be further optimized; 2) the double-sided low-temperature silver paste of the heterojunction battery has large using amount and is not beneficial to cost control.

In order to reduce the amount of silver paste, a technology for arranging a main grid line by using a metal line is available at present, namely only an auxiliary grid line is arranged on a battery piece, the metal line is used as the main grid line, and the metal line and the auxiliary grid line are electrically connected after lamination. However, the confluence of the metal wires is difficult to realize, so that the current leading-out structure of the photovoltaic module is complex.

Disclosure of Invention

The invention mainly aims to provide a grid line adhesive film and a solar cell module, and aims to solve the problem that current is led out complicatedly when a metal wire of a photovoltaic cell in the prior art is used as a main grid line.

In order to achieve the above object, according to one aspect of the present invention, there is provided a gate line adhesive film including: a substrate packaging adhesive film; the packaging film comprises a substrate packaging adhesive film, an electric interconnection layer array, a plurality of electric interconnection layers and a plurality of main grid lines, wherein each electric interconnection layer of the electric interconnection layer array is arranged on the substrate packaging adhesive film, each electric interconnection layer comprises a main grid line part and an interconnection part, the main grid line part comprises one or more main grid lines, and the interconnection part is electrically connected with each main grid line.

Further, the thickness of the interconnection part is greater than that of the main grid line, preferably the thickness of the main grid line is 0.01-0.5 mm, preferably the thickness of the interconnection part is 0.03-0.8 mm, and preferably the thickness of the substrate packaging adhesive film is 0.2-0.8 mm.

Further, the array of electrical interconnection layers is divided into a plurality of electrical interconnection units, each electrical interconnection unit includes a plurality of electrical interconnection layers arranged along a first direction, and the electrical interconnection units are arranged along a second direction, the first direction and the second direction being arranged perpendicularly.

Further, the main gate lines extend in the first direction, and the interconnection portion of each of the electrical interconnection layers is disposed at one side of the main gate line portion and electrically connected to an end portion of each of the main gate lines.

Further, starting from any one end of the second direction, the interconnections in the respective electrical interconnection layers of the electrical interconnection units of the odd-numbered columns are electrically connected to the first end of the bus bar, and the interconnections in the respective electrical interconnection layers of the electrical interconnection units of the even-numbered columns are electrically connected to the second end of the bus bar.

Further, the substrate packaging adhesive film is an EVA film, and preferably, the substrate packaging adhesive film is a pre-crosslinked film.

Further, the main grid line is a grid line made of solidified conductive paste, and preferably, the main grid line is arranged on the substrate packaging adhesive film through one of screen printing, ink-jet printing, coating process, electroplating, chemical plating, physical vapor deposition and chemical vapor deposition.

Further, the main interconnection part is a solidified conductive paste grid line or a metal layer.

The utility model provides a solar cell module, including the front bezel glass that superposes in proper order, the front rubber film, photovoltaic cell piece, back bed glued membrane and back bed packaging board, photovoltaic cell piece has vice grid line, this front rubber film and back bed glued membrane be any kind of above-mentioned grid line glued membrane, each electric interconnection layer and the photovoltaic cell piece one-to-one setting of grid line glued membrane and the main grid line and the vice grid line electricity of grid line glued membrane are connected, the protruding and photovoltaic cell piece setting of interconnection portion of the relative both ends position of front rubber film and back bed glued membrane, the interconnection portion of the all the other positions of front rubber film and back bed glued membrane one-to-one electricity between adjacent photovoltaic cell piece is connected.

Further, the rear packaging plate is glass, and the front adhesive film and the rear adhesive film are transparent adhesive films; or the back layer packaging plate is a back plate, the front layer adhesive film is a transparent adhesive film, and the back layer adhesive film is a colored film.

By applying the technical scheme of the invention, the electric interconnection layer is arranged in the packaging adhesive film, and the current on the auxiliary grid line without the main grid cell can be collected without arranging a conducting wire additionally, wherein the main grid line is in direct contact with the auxiliary grid line without the main grid cell, so that the current is collected preliminarily; the current on the bus bars is further summed up using interconnects electrically connected to the bus bars. Therefore, the main grid line and the packaging adhesive film are compounded into a whole, the current collecting circuit can be formed when the battery is packaged, the interconnection part is utilized to electrically connect the main grid line, only a conducting wire needs to be arranged between the junction box and the interconnection part, and the current of the main grid line does not need to be led out by a complex circuit structure. In addition, this application is because the cohesion of encapsulation glued membrane and battery piece is stronger, and the spare part can be filled up to the glued membrane after the encapsulation to make the main grid line closely laminate with the battery piece, improved the yield.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic view of a grid line adhesive film of the present invention;

fig. 2 shows a schematic structural diagram of a grid line adhesive film and a battery piece before lamination; and

fig. 3 shows a schematic structural diagram of the grid line adhesive film and the battery piece after lamination.

Wherein the figures include the following reference numerals:

10. a substrate packaging adhesive film; 20. an electrical interconnect layer; 21. a main gate line portion; 22. and interconnects 30, a photovoltaic cell sheet.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As described in the background of the present application, in the prior art, a metal wire for guiding current on an auxiliary gate line of a solar cell (without a main gate cell) without a main gate line needs to be provided with a current guiding device, which results in a complicated current guiding structure of a photovoltaic module. In order to solve the above problem, the present application provides a grid line glued membrane, and this grid line glued membrane includes: the packaging film comprises a substrate packagingadhesive film 10 and an electric interconnection layer array, wherein eachelectric interconnection layer 20 of the electric interconnection layer array is arranged on the substrate packaging adhesive film, eachelectric interconnection layer 20 comprises a main grid line part 21 and aninterconnection part 22, the main grid line part 21 comprises one or more main grid lines, and theinterconnection part 22 is electrically connected with each main grid line.

According to the method, theelectrical interconnection layer 20 is arranged in the packaging adhesive film, and the current on the auxiliary grid line without the main grid cell can be collected without arranging a conducting wire, wherein the main grid line is in direct contact with the auxiliary grid line without the main grid cell, so that the current is collected preliminarily; the current on the bus bars is further summed up usinginterconnects 22 electrically connected to the bus bars. Therefore, the main grid line and the packaging adhesive film are compounded into a whole, the current collecting circuit can be formed when the battery is packaged, theinterconnection part 22 is utilized to electrically connect the main grid line, only a conducting wire needs to be arranged between the junction box and theinterconnection part 22, and the current of the main grid line does not need to be led out by a complex circuit structure. In addition, this application is because the cohesion of encapsulation glued membrane and battery piece is stronger, and the spare part can be filled up to the glued membrane after the encapsulation to make the main grid line closely laminate with the battery piece, improved the yield.

The main grid lines are arranged on the transparent film of the substrate in various ways, and the conductive metal slurry can be arranged on the grid lines of the conductive slurry in the ways of screen printing, ink-jet printing or coating, and the like, or the metal grid line layer can be arranged in the ways of printing, electroplating, chemical plating, physical vapor deposition, chemical vapor deposition, and the like. The shape of the main grid line can be a straight line, a curve, a ring line or any other shape, and can also be any combination of a plurality of shapes. Theinterconnections 22 are arranged in the same manner as the bus bars. In addition, the above-mentioned baseencapsulant film 10 can be prepared by any method of preparing an encapsulant film in the prior art, such as extrusion casting.

In one embodiment, the thickness of theinterconnect 22 is greater than the thickness of the bus bar. The protrusion of theinterconnect 22 relative to the bus bars may facilitate easier connection of theinterconnect 22 to an external circuit for conducting current. The thickness of the main grid line is preferably 0.01-0.5 mm, and the thickness of the interconnectingpart 22 is preferably 0.03-0.8 mm, so that the resistance loss is reduced. The thickness of the substrate packagingadhesive film 10 is preferably 0.2-0.8 mm, and the thickness is preferably in a range considering factors such as adhesion and stability of the grid line adhesive film structure.

In one embodiment, the array ofelectrical interconnect layers 20 is divided into a plurality of electrical interconnect units, each electrical interconnect unit including a plurality ofelectrical interconnect layers 20 arranged in a first direction, and the electrical interconnect units are arranged in a second direction, the first and second directions being arranged vertically. By the above method, the respectiveelectrical interconnection layers 20 are arranged in mutually perpendicular rows and columns. The manufacturing steps of the grid line glue film, the solar cell placing the cell piece on the grid line glue film and the like are arranged regularly, so that the solar cell manufacturing method is more suitable for flow line production, and the manufacturing efficiency is improved. Meanwhile, the arrangement mode can further ensure the close contact between each interconnection layer and the battery piece, and further improve the yield.

Preferably, the bus bars extend in the first direction, and theinterconnection portion 22 of eachelectrical interconnection layer 20 is disposed at one side of the bus bar portion 21 and electrically connected to an end portion of each bus bar. Through the arrangement mode, each main grid line is a straight line which is parallel to each other. The setting shortens the conduction distance of electric current like this, can reduce the series resistance of subassembly, reduces the resistance loss to reduce unnecessary and sheltered from, make photoelectric conversion rate promote to some extent. In addition, the arrangement of the interconnection layer array is more regular by adopting the arrangement, and the preparation efficiency is further improved.

In one embodiment, starting from any end of the second direction, theinterconnects 22 in the respectiveelectrical interconnect layers 20 of the electrical interconnect units of the odd-numbered columns are electrically connected to the first ends of the bus bars, and theinterconnects 22 in the respectiveelectrical interconnect layers 20 of the electrical interconnect units of the even-numbered columns are electrically connected to the second ends of the bus bars. By the arrangement mode, theinterconnection parts 22 in each row are mutually staggered in the second direction, so that the phenomenon that the stress of the packaged grid line adhesive film at theinterconnection parts 22 is overlarge, the resistance is increased, and the structural stability of the grid line adhesive film is reduced is avoided.

The substrate encapsulatingadhesive film 10 may be prepared by using any commonly used material in the prior art, and in order to further improve the solar transmittance and the structural stability, the substrate encapsulatingadhesive film 10 is preferably an EVA film. In order to reduce the package deformation of the bus bars and theinterconnects 22 and avoid the occurrence of cracks, the substrate packagingadhesive film 10 is preferably a pre-crosslinked film.

In order to further make the main gate lines easier to set, the main gate lines are preferably cured conductive paste gate lines, and the main gate lines are further preferably set on the substrate packagingadhesive film 10 through one of screen printing, inkjet printing, coating process, electroplating, chemical plating, physical vapor deposition and chemical vapor deposition process, so as to further improve the efficiency of setting the main gate lines.

In order to further facilitate the provision of theinterconnections 22, it is preferable that theinterconnections 22 be a gate line or a metal layer of a cured conductive paste.

In another exemplary embodiment of the present application, a solar cell module is provided, which includes a front glass, a front adhesive film, aphotovoltaic cell sheet 30, a rear adhesive film, and a rear packaging plate stacked in sequence, where thephotovoltaic cell sheet 30 has a secondary grid line, and is characterized in that the front adhesive film and the rear adhesive film are any of the above-mentioned grid line adhesive films, eachelectrical interconnection layer 20 of the grid line adhesive film is disposed in one-to-one correspondence with thephotovoltaic cell sheet 30, and a main grid line of the grid line adhesive film is electrically connected to the secondary grid line, theinterconnection portions 22 at two opposite ends of the front adhesive film and the rear adhesive film protrude from thephotovoltaic cell sheet 30, and theinterconnection portions 22 at the other positions of the front adhesive film and the rear adhesive film are electrically connected between adjacentphotovoltaic cell sheets 30 in one-to one correspondence.

The solar cell module of this application is through using any kind of above-mentioned grid line glued membrane as front rubber membrane and back layer glued membrane, makes the minor grid line on the battery be connected with the main grid line of grid line glued membrane to interconnect 22 outstanding with front rubber membrane and back layer glued membrane, form interconnect's battery cluster, reduced conducting material's use on the one hand, reduce cost, on the other hand has shortened the conduction distance of electric current, can reduce the series resistance of subassembly, reduce resistance loss. In addition, the manufacturing method is simple and suitable for industrial large-scale production.

In one embodiment, preferably, the rear packaging plate is glass, and the front adhesive film and the rear adhesive film are transparent adhesive films to further improve the solar transmittance; or the back layer packaging plate is a back plate, the front layer adhesive film is a transparent adhesive film, and the back layer adhesive film is a colored film.

As can be seen from the above description, the above-described embodiments of the present invention achieve the following technical effects:

according to the method, the electric interconnection layer is arranged in the packaging adhesive film, and the current on the auxiliary grid line without the main grid battery piece can be collected without arranging a conducting wire, wherein the main grid line is in direct contact with the auxiliary grid line without the main grid battery piece, so that the current is collected preliminarily; the current on the bus bars is further summed up using interconnects electrically connected to the bus bars. Therefore, the main grid line and the packaging adhesive film are compounded into a whole, the current collecting circuit can be formed when the battery is packaged, the interconnection part is utilized to electrically connect the main grid line, only a conducting wire needs to be arranged between the junction box and the interconnection part, and the current of the main grid line does not need to be led out by a complex circuit structure. In addition, this application is because the cohesion of encapsulation glued membrane and battery piece is stronger, and the spare part can be filled up to the glued membrane after the encapsulation to make the main grid line closely laminate with the battery piece, improved the yield.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

Translated fromChinese

1.一种栅线胶膜，其特征在于，所述栅线胶膜包括：1. a grid line adhesive film, is characterized in that, described grid line adhesive film comprises:基底封装胶膜(10)；base encapsulation film (10);电互连层阵列，所述电互连层阵列的各所述电互连层(20)设置在所述基底封装胶膜(10)上，各所述电互连层(20)包括主栅线部(21)和互连部(22)，所述主栅线部(21)包括一条或多条主栅线，所述互连部(22)与各所述主栅线电连接。An electrical interconnection layer array, each of the electrical interconnection layers (20) of the electrical interconnection layer array is disposed on the base encapsulation adhesive film (10), and each of the electrical interconnection layers (20) includes a busbar A line portion (21) and an interconnection portion (22), the busbar line portion (21) includes one or more busbar lines, and the interconnection portion (22) is electrically connected to each of the busbar lines.2.根据权利要求1所述的栅线胶膜，其特征在于，所述互连部(22)的厚度大于所述主栅线的厚度，优选所述主栅线的厚度为0.01～0.5mm，优选所述互连部(22)的厚度为0.03～0.8mm，优选所述基底封装胶膜(10)的厚度为0.2～0.8mm。2 . The gate line adhesive film according to claim 1 , wherein the thickness of the interconnection portion ( 22 ) is greater than the thickness of the bus line, and preferably the thickness of the bus line is 0.01˜0.5 mm. 3 . Preferably, the thickness of the interconnection portion (22) is 0.03-0.8 mm, and the thickness of the base encapsulation adhesive film (10) is preferably 0.2-0.8 mm.3.根据权利要求1所述的栅线胶膜，其特征在于，将所述电互连层(20)阵列划分为多个电互连单元，各所述电互连单元包括沿第一方向排列的多个电互连层(20)，且所述电互连单元沿第二方向排列，所述第一方向和所述第二方向垂直设置。3. The gate line adhesive film according to claim 1, characterized in that, the electrical interconnection layer (20) array is divided into a plurality of electrical interconnection units, and each of the electrical interconnection units includes elements along the first direction. A plurality of electrical interconnection layers (20) are arranged, and the electrical interconnection units are arranged along a second direction, and the first direction and the second direction are vertically arranged.4.根据权利要求3所述的栅线胶膜，其特征在于，所述主栅线沿所述第一方向延伸，各所述电互连层(20)中所述互连部(22)设置在所述主栅线部(21)的一侧且与各所述主栅线的端部电连接。4. The gate line adhesive film according to claim 3, wherein the main gate line extends along the first direction, and the interconnection portion (22) in each of the electrical interconnection layers (20) It is provided on one side of the busbar line portion (21) and is electrically connected to the end portion of each busbar line.5.根据权利要求4所述的栅线胶膜，其特征在于，以第二方向的任意一端开始，奇数列的所述电互连单元的各所述电互连层(20)中所述互连部(22)与所述主栅线的第一端电连接，偶数列的所述电互连单元的各所述电互连层(20)中所述互连部(22)与所述主栅线的第二端电连接。5. The gate line adhesive film according to claim 4, characterized in that, starting from any end of the second direction, in each of the electrical interconnection layers (20) of the electrical interconnection units of odd columns The interconnection portion (22) is electrically connected to the first end of the busbar, and the interconnection portion (22) in each of the electrical interconnection layers (20) of the electrical interconnection units in the even-numbered columns is electrically connected to the first end of the busbar line. The second ends of the bus bars are electrically connected.6.根据权利要求1所述的栅线胶膜，其特征在于，所述基底封装胶膜(10)为EVA膜，优选所述基底封装胶膜(10)为预交联膜。6 . The grid line adhesive film according to claim 1 , wherein the base encapsulation adhesive film ( 10 ) is an EVA film, and preferably the base encapsulation adhesive film ( 10 ) is a pre-crosslinked film. 7 .7.根据权利要求1所述的栅线胶膜，其特征在于，所述主栅线为固化导电浆料栅线，优选所述主栅线通过丝网印刷、喷墨打印、涂布工艺、电镀、化学镀、物理气相沉积、化学气相沉积工艺中的一种设置在所述基底封装胶膜(10)上。7 . The grid line adhesive film according to claim 1 , wherein the bus grid lines are cured conductive paste grid lines, preferably the bus grid lines are processed by screen printing, inkjet printing, coating process, One of electroplating, electroless plating, physical vapor deposition and chemical vapor deposition process is arranged on the base encapsulation adhesive film (10).8.根据权利要求1所述的栅线胶膜，其特征在于，所述互连部(22)为固化导电浆料栅线或金属层。8 . The gate line adhesive film according to claim 1 , wherein the interconnection portion ( 22 ) is a cured conductive paste gate line or a metal layer. 9 .9.一种太阳能电池组件，包括依次叠置的前板玻璃、前层胶膜、光伏电池片(30)、后层胶膜和后层封装板，所述光伏电池片(30)具有副栅线，其特征在于，所述前层胶膜和所述后层胶膜为权利要求1至8中任一项所述的栅线胶膜，所述栅线胶膜的各所述电互连层(20)与所述光伏电池片(30)一一对应设置且所述栅线胶膜的主栅线与所述副栅线电连接，所述前层胶膜和所述后层胶膜相对两端位置的互连部(22)突出与所述光伏电池片(30)设置，所述前层胶膜和所述后层胶膜其余位置的互连部(22)在相邻所述光伏电池片(30)之间一一对应电连接。9. A solar cell assembly, comprising a front plate glass, a front-layer adhesive film, a photovoltaic cell sheet (30), a rear-layer adhesive film and a rear-layer encapsulation plate stacked in sequence, the photovoltaic cell sheet (30) having a secondary grid It is characterized in that, the front-layer adhesive film and the back-layer adhesive film are the grid line adhesive film according to any one of claims 1 to 8, and each of the electrical interconnections of the grid line adhesive film The layers (20) are arranged in a one-to-one correspondence with the photovoltaic cell sheets (30), and the main grid lines of the grid line adhesive film are electrically connected to the sub grid lines, the front layer adhesive film and the rear adhesive film The interconnecting parts (22) at opposite ends are protruding from the photovoltaic cell sheet (30), and the interconnecting parts (22) at the remaining positions of the front-layer adhesive film and the rear-layer adhesive film are adjacent to the said photovoltaic cell sheet (30). The photovoltaic cells (30) are electrically connected in one-to-one correspondence.10.根据权利要求9所述的太阳能电池组件，其特征在于，所述后层封装板为玻璃，所述前层胶膜和所述后层胶膜均为透明胶膜；或者所述后层封装板为背板，所述前层胶膜为透明胶膜，所述后层胶膜为有色膜。10 . The solar cell assembly according to claim 9 , wherein the rear-layer packaging plate is glass, the front-layer adhesive film and the rear-layer adhesive film are both transparent adhesive films; or the rear-layer adhesive film is a transparent adhesive film. 11 . The encapsulation board is a back board, the front-layer adhesive film is a transparent adhesive film, and the rear-layer adhesive film is a colored film.

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