WO2021077786A1

WO2021077786A1 - Strip-shaped welding strip

Info

Publication number: WO2021077786A1
Application number: PCT/CN2020/097751
Authority: WO
Inventors: 申品文; 申盼; 仲春华; 王建波; 朱琛; 吕俊; 杨飞; 王彪
Original assignee: 泰州隆基乐叶光伏科技有限公司
Priority date: 2019-10-21
Filing date: 2020-06-23
Publication date: 2021-04-29
Also published as: CN210837785U

Abstract

A strip-shaped welding strip (1). A plurality of holes (2) are continuously provided in a length direction of the strip-shaped welding strip (1), a plurality of local broken openings (3) are provided in the length direction of the strip-shaped welding strip (1), and the strip-shaped welding strip (1) is integrally connected. The provided strip-shaped welding strip (1) can prevent the welding strip from falling off completely in a reliability test, reducing the reliability risk.

Description

A kind of strip welding ribbon

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 201921767387.8 and an invention title of "a kind of strip welding ribbon" on October 21, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of solar modules, in particular to a strip-shaped welding ribbon.

Background technique

At present, the technology of laminated module is becoming more and more mature. The laminated battery and the laminated battery are interconnected by conductive glue, and the small string composed of multiple batteries is connected in series with the small string. Specifically, the welding ribbon is welded on the edge of the battery electrode. , And then use the bus bar to gather the welding ribbons of each plate to draw out the positive and negative currents to form a complete laminated assembly.

The solder tape used between the small string and the small string is a tin-plated copper tape. The tin-plated copper tape is bonded to the electrode of the laminated battery. The current problem is that the solder tape itself has no adhesion. Flux is used to achieve bonding, and the flux itself has a certain degree of hardness. Therefore, once the solder ribbon falls off somewhere in the reliability test, it will affect the left and right, and even a whole solder ribbon will fall off as a whole. In the face of this situation, the current One technique is to adopt a long strip of welding tape with a width of about 7mm and a length equal to the width of the battery slice. Holes are drilled at a fixed interval in the center of the welding tape. This welding tape is called a perforated welding tape, as shown in Figure 1. The advantage of the perforated solder ribbon is that it is convenient to bend and fold the solder ribbon and save the cost of the solder ribbon. However, it was found in the reliability test of the laminated assembly that such a solder ribbon design has limitations, such as the solder ribbon somewhere in the main grid of the battery Falling off, the damage point will spread to the left and right, and even a whole strip of welding tape will fall off, resulting in a large area current loss and a decrease in the power of the photovoltaic cell.

Summary of the invention

In view of the above-mentioned defects or deficiencies in the prior art, the purpose of the present application is to provide a strip-shaped welding tape to solve the current problem that the welding tape is easy to fall off as a whole in the reliability test.

This application provides a strip welding tape, including:

A plurality of openings are continuously provided in the length direction of the strip welding ribbon,

The strip-shaped welding tape is also provided with a plurality of partial breakages in the length direction, and the strip-shaped welding tape is integrally connected.

Further, each of the openings corresponds to one of the partial disconnection openings, and the plurality of partial disconnection openings are alternately arranged on both sides of the strip-shaped welding tape.

Further, the width of the partially broken opening is 0.1mm to 0.5mm.

Further, the partial disconnection opening is located at a connecting portion adjacent to the opening.

Further, the connecting parts of the adjacent openings are symmetrically provided with a partial disconnection opening up and down.

Further, the length of each partial disconnection on the connecting portion of the adjacent openings ranges from 1.8 mm to 2.2 mm, and the width dimension ranges from 0.3 mm to 0.7 mm.

Further, a flexible welding tape is connected to the position of each of the partial disconnection openings by welding.

Further, the flexible welding tape and the strip-shaped welding tape are made of the same material.

Further, the thickness of the strip-shaped solder ribbon is 120 μm, and the thickness of the flexible solder ribbon ranges from 20 μm to 50 μm.

Further, the shape of the opening is rectangular.

Beneficial effects: The strip-shaped welding tape provided by the present application is provided with a plurality of openings in the length direction, so that the strip-shaped welding tape is a perforated welding tape, and a plurality of partial breakages are arranged in the length direction of the perforated welding tape. At the same time, the welding strip is connected as a whole, that is, it can ensure the current transmission of the welding strip. In the reliability test, this kind of welding strip can make that if the welding strip falls off somewhere, it will not fall off as a whole; In this way, the flexible welding ribbon forms a combined welding ribbon, which can alleviate the falling off of the welding ribbon at the flexible welding ribbon in the reliability test, thereby avoiding the overall falling off of the welding ribbon, and is easy to realize and control in production.

The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of this application more obvious and understandable. , The following specifically cite the specific implementation of this application.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present application will become more apparent:

FIG. 1 is a schematic diagram of the structure of a strip welding ribbon used in the prior art;

Figure 2 is a schematic diagram of the structure of the first strip-shaped welding ribbon provided by this application;

Fig. 3 is a schematic diagram of the second type of strip welding ribbon structure provided by this application;

Fig. 4 is a schematic diagram of the third type of strip welding ribbon structure provided by this application;

Fig. 5 is a schematic diagram of the fourth type of strip welding ribbon structure provided by this application;

Reference signs: 1 strip-shaped welding tape, 2 openings, 3 partial breaks, 4 connecting parts, 5 flexible welding tape.

Specific embodiment

The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the related utility model, but not to limit the utility model. In addition, it should be noted that, for ease of description, only the parts related to the utility model are shown in the drawings.

It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the application will be described in detail with reference to the drawings and in conjunction with the embodiments.

Taking the small string composed of multiple cells in the laminated assembly and the small string as an example, the soldering tape used between the small string and the small string is a tin-plated copper tape, and the tin-plated copper tape is adhered to the laminated battery. On the electrode, the current problem is that the ribbon itself has no adhesiveness. The ribbon is bonded by flux, and the flux itself has a certain degree of hardness. Therefore, once the ribbon falls off in the reliability test , It will affect the left and right, and even a whole strip of welding strip will fall off as a whole. In this situation, the prior art adopts a long strip of welding strip with a width of about 7mm and a length equal to the width of the battery sheet. Fixed pitch drilling, this ribbon is called perforated ribbon, as shown in Figure 1. The advantage of such a perforated ribbon is that it facilitates the bending and folding of the ribbon and saves the cost of the ribbon. However, the reliability of the laminated assembly In the test, it was found that such a ribbon design has limitations. For example, the ribbon will fall off somewhere on the main grid of the battery, and the damage will spread to the left and right, and even a whole ribbon will fall off, resulting in large area current loss and photovoltaic cell power. decline.

Based on this, the present application provides a strip-shaped welding tape, which can solve the above-mentioned problems. As shown in Figures 2 to 3, the strip welding tape includes:

A plurality of openings 2 are continuously provided in the length direction of the strip-shaped welding ribbon 1,

The strip-shaped welding ribbon 1 is also provided with a plurality of partial disconnection openings 3 in the length direction, and the strip-shaped welding ribbon 1 is integrally connected.

Preferably, the width of the strip-shaped welding ribbon ranges from 4 mm to 10 mm, and the length ranges from 100 mm to 200 mm.

Specifically, a plurality of openings are continuously arranged in the length direction of the strip-shaped welding strip, and there is a certain interval between adjacent openings. The interval here may be an equal interval or a non-equal interval.

Preferably, the shape of the opening here is a rectangle, and the long side of the rectangle along the length direction of the strip-shaped welding strip can also be the short side of the rectangle, which is not limited.

It should be noted that the opening here may also be one of square, circular, trapezoidal, triangular, etc.

The strip-shaped welding tape provided in this embodiment is provided with a plurality of openings in the length direction, so that the strip-shaped welding strip is a perforated welding strip, and a plurality of partial breaks are arranged in the length direction of the perforated welding strip, and the welding is performed at the same time. The whole strip is connected, which can guarantee the current transmission of the welding strip. In the reliability test, this kind of welding strip can make the welding strip fall off somewhere but not as a whole; the welding is flexible at the partial disconnection. In this way, the welding strip forms a combined welding strip, which can alleviate the peeling of the welding strip at the flexible welding strip during the reliability test, thereby avoiding the overall shedding of the welding strip, reducing the reliability risk, and is easy to realize and control in production.

As an optional embodiment, as shown in FIG. 2, each of the openings 2 corresponds to one of the partial disconnection openings 3, and the plurality of partial disconnection openings 3 are in the strip welding ribbon 1. Set alternately on both sides.

Specifically, each opening is correspondingly provided with a partial disconnection port, and the partial disconnection opening may be connected to the opening or not connected to the opening when it is provided on the opening. In addition, multiple partial breaks are alternately arranged up and down on both sides in the length direction of the strip ribbon. Taking the setting of the corresponding partial breaks on the three adjacent openings as an example, assume the first from left to right. The partial break on one opening is located on the upper edge of the strip of ribbon where the opening is located, the partial break on the second opening is located on the lower edge of the strip of ribbon where the opening is located, and the third The partial break on the opening is located on the upper edge of the strip-shaped welding ribbon where the opening is located.

The purpose of this setting is to ensure the overall connection of the welding ribbon, thereby ensuring the current transmission of the welding ribbon, so as not to affect the current transmission of the welding ribbon. If the welding ribbon falls off somewhere in the main grid of the battery, only a small section of the welding ribbon will fall off due to the joint action. The welding ribbon can stop falling off at the local break at the edge of the welding ribbon, which prevents longer distances. Falling off reduces the reliability risk.

Preferably, the width of each partial disconnection 3 is 0.1mm to 0.5mm, which can be arbitrarily selected within this interval. In addition, the width of the partial disconnection here refers to the width of the disconnection when it is a square opening. The width, of course, the shape of the partial break in this embodiment can be any shape of the break.

As an optional embodiment, as shown in FIG. 3, the partial disconnection 3 is located at the connecting portion 4 adjacent to the opening 2.

Specifically, the connecting part between adjacent openings on the strip-shaped welding tape is called the connecting part, and each partial disconnection on the strip-shaped welding tape is located at each connecting part, and the partial disconnection can make the welding tape Partially disconnected at the connection part, so that when the solder ribbon falls off somewhere in the main grid, only a small part of the solder ribbon is disconnected and dropped off through the local disconnection provided on the connection part of the adjacent opening , Which can prevent the ribbon from falling off in a larger area.

As an optional embodiment, as shown in FIG. 3, the connecting portion 4 of the adjacent openings 2 is provided with a partial cut-off opening 3 symmetrically up and down.

Specifically, the connecting portion of adjacent openings has positions in the length direction of the ribbon where the partial disconnection can be set up and down. Therefore, in this embodiment, one partial disconnection is provided at the upper and lower symmetrical positions of the connecting portion. Of course, as In another embodiment, if the distance between adjacent openings on the welding ribbon is relatively large, a plurality of partial breaks can be arranged symmetrically up and down on the connecting portion.

The welding ribbons arranged in this way can make the welding ribbons be disconnected from the left and right at the connection part, but the welding ribbons are connected up and down, which ensures the overall connection of the welding ribbons and does not affect the current collection. If the welding ribbon falls off somewhere in the main grid of the battery, only a small section of the welding ribbon will fall off under the action of the joint. The loss of distance reduces the reliability risk.

Preferably, the length of each partial disconnection 3 on the connecting portion 4 of the adjacent opening 2 is in the range of 1.8mm to 2.2mm, and the width dimension is in the range of 0.3mm to 0.7mm, and the length and width can be arbitrarily within the above interval. This will form multiple sets of length and width combinations. When the length is larger and the width is larger, the faster the ribbon will fall off the local port when it falls off by the joint action. Therefore, the large area of the welding tape is prevented from falling off. In addition, the length and width of the partial opening here refer to the size when the opening is a square opening. Of course, the shape of the partial opening in this embodiment can be any shape of the opening.

As an alternative embodiment, as shown in Figs. 4 and 5, a flexible welding tape 5 is connected to the position of each of the partial disconnection openings 3 by welding.

Specifically, as shown in FIG. 4, each partial disconnection opening is arranged on the upper and lower sides of the welding ribbon alternately, as shown in FIG. 5, the connection part of the adjacent openings is arranged up and down the welding belt with the partial disconnection opening. The local breaks are connected by flexible welding tape to form a combined welding tape. When the welding tape falls off somewhere in the main grid, the flexible welding tape is thinner and more flexible, and the acceptable pull-off force is greater. The flexible welding ribbon can reduce the falling off of the welding ribbon and alleviate the falling off of the entire welding ribbon, thereby avoiding the falling off of the welding ribbon in a larger area.

As an alternative embodiment, the material of the flexible welding tape 5 is the same as the material of the strip-shaped welding tape 1, which facilitates the welding between the flexible welding tape and the strip-shaped welding tape and improves the welding stability.

Preferably, when the thickness of the strip-shaped welding strip 1 is 120 μm, the thickness of the flexible welding strip 5 is controlled within the range of 20 μm to 50 μm, which not only facilitates the welding of the strip-shaped welding strip and the flexible welding strip, but also ensures the welding The welding performance at the location can better ensure that the pull-off force of the flexible ribbon relative to the strip ribbon is sufficient to make the ribbon difficult to disconnect and fall off here.

The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover the technical solutions without departing from the concept of the utility model. Other technical solutions formed by any combination of features or equivalent features. For example, the above-mentioned features and the technical features disclosed in this application but not limited to the technical solutions with similar functions are mutually replaced to form a technical solution.

Claims

A strip-shaped welding ribbon, which is characterized in:

A plurality of openings are continuously provided in the length direction of the strip welding ribbon,

The strip-shaped welding tape is also provided with a plurality of partial breaks in the length direction, and the strip-shaped welding tape is integrally connected.
The strip-shaped welding tape according to claim 1, wherein each of the openings corresponds to one of the partial disconnection openings, and the plurality of partial disconnection openings are located on both sides of the strip-shaped welding strip. Set alternately on.
The strip-shaped welding tape according to claim 2, wherein the width of the partial breaking opening is 0.1 mm to 0.5 mm.
The strip-shaped welding tape according to claim 1, wherein the partial disconnection opening is located at a connecting portion adjacent to the opening.
The strip-shaped welding tape according to claim 4, wherein the connecting portion adjacent to the opening is provided with one of the partial disconnection openings symmetrically up and down.
The strip-shaped welding tape according to claim 5, wherein the length of each partial break on the connecting portion of the adjacent openings ranges from 1.8mm to 2.2mm, and the width ranges from 0.3mm to 0.7mm.
The strip-shaped welding tape according to any one of claims 1-6, wherein a flexible welding tape is connected to the position of each of the partial breaks by welding.
8. The strip-shaped welding tape according to claim 7, wherein the material of the flexible welding tape and the strip-shaped welding tape are the same.
8. The strip-shaped welding tape according to claim 7, wherein the thickness of the strip-shaped welding strip is 120 μm, and the thickness of the flexible welding strip is in the range of 20 μm to 50 μm.
The strip welding ribbon according to claim 1, wherein the shape of the opening is rectangular.