CN104526177A - Photovoltaic cell piece welding device and welding technology thereof - Google Patents

Abstract

The invention discloses a photovoltaic cell piece welding device and a welding technology of the photovoltaic cell piece welding device. The welding technology comprises the steps that at least two photovoltaic cell pieces are provided, and a flux is only sprayed on the backlight faces of the photovoltaic cell pieces; a welding strip is provided, and only one face of the welding strip is coated with a flux; the welding strip is connected to the two photovoltaic cell pieces. The mode of combining the means of spraying electrodes of the backlight faces of the cell pieces and coating the bottom face of the welding strip is adopted, a flux does not exist on the top face of the welding strip, the problem of grid line corrosion caused by flux residues on light-receiving faces of the cell pieces is solved, and the problems that the top face of the welding strip is blacked under the influences of ultraviolet rays, the temperature and the like, and reliability is poor are solved.

Description

Photovoltaic cell welding equipment and its welding process

technical field

The present application relates to the field of photovoltaic module manufacturing, and in particular to a photovoltaic cell sheet welding equipment and a welding process thereof.

Background technique

At present, there are two main ways to supply flux for automatic welding machines in the photovoltaic industry: one is the ribbon soaking type, that is, the ribbon is passed through a container filled with flux in advance, so that the ribbon is completely immersed in the flux, thereby Attach the flux to the surface of the ribbon, and then solder the ribbon to the busbar electrodes on the light-receiving side of the photovoltaic cell; Flux is pre-sprayed, and then the ribbon is soldered to the photovoltaic cell.

These two welding methods are likely to cause flux residues in the edge area of the busbar electrode on the light-receiving surface of the cell, which will affect the reliability of the component and the power generation efficiency. For example, the adhesion between EVA and the cell is not good, Thereby affecting the reliability of the component. However, if the nozzle is used to spray the flux on the electrodes of the main grid lines of the battery, the flux is easily splashed to the area other than the electrodes of the main grid lines of the battery, so that the flux is easy to corrode the fine details of the battery sheets connected to the electrodes of the main grid lines. Grid lines, which affect the reliability of components and low power generation efficiency.

Contents of the invention

The purpose of this application is to provide a photovoltaic battery sheet welding equipment and its welding process, so as to improve the shortcomings of the two methods of ribbon immersion and battery sheet spraying in the prior art.

In order to achieve the above purpose, this application provides a photovoltaic cell welding process, including:

Provide at least two photovoltaic cells, and only spray flux on the backlight side of the photovoltaic cells;

providing a solder ribbon and applying flux to only one side of said ribbon;

Soldering ribbons are respectively connected to the two photovoltaic cells.

Further, spraying the flux only on the backlight surface of the photovoltaic battery sheet specifically includes: placing the backlight surface of the photovoltaic battery sheet facing down, and spraying the flux on the back electrode of the backlight surface by using a nozzle.

Further, applying flux to only one side of the soldering strips specifically includes: passing the soldering strips through a flux application device, using the flux application device to apply flux only to the bottom surface of the soldering strips, and keeping the top of the soldering strips Flux is not attached to the surface.

Further, connecting the soldering strips to the two photovoltaic cell sheets respectively, specifically includes:

Mounting the bottom surface of the flux-coated ribbon to the light-receiving surface of a photovoltaic cell;

Mount the top surface of the solder ribbon without flux attached to the backlight surface of another photovoltaic cell and connect it to the back electrode on the backlight surface.

The present application also provides a photovoltaic cell sheet welding equipment, including a flux spraying device that is arranged toward the backlight surface of the photovoltaic cell sheet and sprays flux to the backlight surface, a welding ribbon retracting device wrapped with a welding ribbon, and a welding ribbon for the welding A flux applicator that passes through and applies flux to one side of the ribbon.

Further, the flux application device includes a container containing flux and a sponge placed on the surface of the container, and the surface of the container is provided with a groove for accommodating the sponge.

Further, the sponge is placed in the groove and faces the bottom surface of the solder strip, so as to apply flux to the bottom surface.

This application adopts the combined method of spraying the electrode on the backlight surface of the battery sheet and smearing the bottom surface of the welding strip, which avoids the flux attached to the top surface of the welding strip and the light-receiving surface of the battery sheet, and solves the problem of flux on the light-receiving surface of the battery sheet. The problem of grid line corrosion caused by flux residue also effectively avoids the problem of blackening and poor reliability of the top surface of the solder ribbon due to the influence of ultraviolet rays and temperature.

Description of drawings

Fig. 1 is a schematic diagram of the photovoltaic cell sheet welding process of the present application.

Fig. 2 is a schematic diagram of the connection method between the ribbon and the photovoltaic cells in the welding process of the photovoltaic cells of the present application.

Fig. 3 is a schematic diagram of the installation of the welding ribbon in the welding process of the photovoltaic cells of the present application.

Fig. 4 is a top view of the photovoltaic cell sheet welding process in operation according to the present application.

Fig. 5 is a schematic structural diagram of a flux application device in the photovoltaic cell welding equipment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

This application discloses a welding process for photovoltaic cells, including:

S101: Provide at least two photovoltaic cells, and spray flux on the backlight surface of the photovoltaic cells ;

Please refer to Fig. 2 and Fig. 3, the two photovoltaic cell sheets 10 are arranged adjacent to each other for connecting in series, the photovoltaic cell sheet 10 is provided with a light-receiving surface 11 and a backlight surface 12, and the light-receiving surface 11 A busbar electrode 13 is provided on the top, and a back electrode 14 is provided on the backlight surface 12 . During the spraying process of the flux, only the backlight surface 12 of the photovoltaic battery sheet 10 is sprayed with the flux by using the nozzle 30, and the flux is only sprayed on the back electrode 14 on the backlight surface, and does not affect the back surface of the photovoltaic battery sheet 10. Flux is sprayed on the light-receiving surface 11 .

When spraying, first place the photovoltaic cells on the station, and set the backlight surface 12 downward, as shown in Figure 3, and then use the nozzle 30 to spray flux on the back electrode 14 on the backlight surface 12 Operation, after spraying, the photovoltaic cells will be transported to the next station along with the moving direction of the conveyor belt, waiting to be connected with the welding ribbon 20 .

: providing a welding strip, and applying flux to one side of the welding strip;

Specifically, only one surface of the soldering strip 20 is coated with flux, while the other surface is kept as it is without coating. twenty two. Since the welding ribbon 20 is to connect two adjacent photovoltaic cells 10 in series at the same time, a part of the welding ribbon 20 is installed on the light-receiving surface 11 of one of the photovoltaic cell sheets and is connected to the busbar electrode on the light-receiving surface 11. 15 connection, and the other part of the ribbon 20 is installed on the backlight surface 12 of the adjacent photovoltaic cell 10 and connected to the back electrode 14 on the backlight surface. Therefore, when two adjacent photovoltaic cells are connected, the photovoltaic cell The light-receiving surface 11 of the solar cell is connected to the bottom surface 22 of the ribbon, and the backlight surface 12 of another adjacent photovoltaic cell is connected to the top surface 21 of the ribbon. In this embodiment, flux is applied A device 40 (for example: a sponge with flux) applies flux to the solder ribbon, and the flux is only applied to the bottom surface 22 of the solder ribbon, but not to the top surface 21, so that the solder ribbon can be bonded to the photovoltaic cell The busbar electrode 15 on the light-receiving surface of the photovoltaic cell is welded and connected, and the top surface 21 of the solder ribbon can be connected to the back electrode 14 on the backlight surface of the adjacent photovoltaic cell without applying flux, because the back electrode 14 has been passed through the nozzle. 30 sprayed with flux.

After the backlight surface of the solder ribbon is painted, it will move to the installation station and be set correspondingly to the back electrode of the photovoltaic cell. This coating method can effectively avoid problems such as blackening of the top surface 21 of the solder strip due to the application of flux and exposure to the sun outdoors for a long time, thereby affecting product reliability and aesthetics.

: connecting the solder ribbons to the two photovoltaic cells respectively.

Specifically, the surface (i.e. the bottom surface 22) coated with flux on the welding ribbon 20 is welded to the light-receiving surface 11 of one of the photovoltaic cells and connected to the busbar electrode on the light-receiving surface 11 by welding, and the welding ribbon The other surface of 20 (namely the top surface 21 ) is soldered to the back electrode 14 on the backlight surface 12 of another photovoltaic cell sheet.

During the connection process, the top surface 21 of the soldering ribbon is connected to the back electrode 14 of the photovoltaic cell sheet, and one end of the soldering ribbon is further extended outward to below the adjacent photovoltaic cell sheet, so that the bottom surface 22 of the soldering ribbon coated with flux faces Adjacent photovoltaic cells, and then install the light-receiving surface 11 of another photovoltaic cell downwards on the bottom surface 22 of the ribbon, so that the bottom surface 22 of the solder ribbon is connected to the busbar electrode on the light-receiving surface 11 of the photovoltaic cell.

From S101 to S103, it can be seen that in the process of adding flux, the present application adopts the combination of spraying the backlight surface 12 of the cell and smearing the bottom surface 22 of the welding strip, so that there is no flux on the top surface 21 of the welding strip , which solves the problem of grid line corrosion caused by residual flux on the light-receiving surface 11 of the battery sheet, and effectively avoids the problem of blackening of the top surface 21 of the ribbon due to the influence of ultraviolet rays and temperature. Connection reliability between EVA encapsulation films.

In addition, the present application also discloses a photovoltaic cell welding equipment, including: a flux spraying device 30 , a flux applying device 40 and a ribbon retracting device 50 , which can be combined as shown in FIG. 4 .

Referring to FIG. 3 and FIG. 4 , the flux spraying device 30 is provided with a nozzle corresponding to the back electrode 14 of the photovoltaic cell for spraying flux on the back electrode 14 of the photovoltaic cell. The welding ribbon retracting device 50 is provided with a reel for winding the welding ribbon 20, and during normal operation, the welding ribbon 20 is continuously released, so that the welding ribbon 20 is continuously transported to the flux application device 40, The flux applying device 40 only applies flux to one surface of the soldering ribbon 20 .

In the best implementation mode of the present application, as shown in FIG. 5 , the flux application device 40 includes a container 41 containing flux A and a sponge 42 placed on the surface of the container. The surface is provided with several grooves 43 for accommodating the sponges 42, the sponges 42 are placed in the grooves 43 and face the bottom surface 22 of the soldering strip for absorbing the flux A in the container 41, and The bottom surface 22 of the soldering strip is in contact with the sponge 42 in the groove 43 when passing through the flux applicator 40 , so that flux is attached to the bottom surface 22 of the soldering strip.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the application, and they are not intended to limit the protection scope of the application. Any equivalent implementation mode or All changes should be included within the scope of protection of this application.

Claims (7)

1. a photovoltaic cell welding and assembling technics, is characterized in that: comprising:

At least two panels photovoltaic cell is provided, and only to the shady face spraying scaling powder of photovoltaic cell;

One welding is provided, and only scaling powder is smeared to the one side of described welding;

Welding is connected to respectively described two photovoltaic cells.

2. photovoltaic cell welding and assembling technics as claimed in claim 1, it is characterized in that: only to the shady face spraying scaling powder of photovoltaic cell, specifically comprise: by the backlight placed face down of photovoltaic cell, utilize nozzle by scaling powder spraying on the back electrode of described shady face.

3. photovoltaic cell welding and assembling technics as claimed in claim 2, it is characterized in that: only scaling powder is smeared to the one side of described welding, specifically comprise: by welding through a scaling powder application device, utilize scaling powder application device scaling powder to be only applied in the bottom surface of welding, and keep the end face of welding not adhere to scaling powder.

4. photovoltaic cell welding and assembling technics as claimed in claim 3, is characterized in that: welding is connected to respectively described two photovoltaic cells, specifically comprises:

The bottom surface of the welding being coated with scaling powder is mounted on the sensitive surface of a photovoltaic cell;

The shady face end face of the welding not being attached with scaling powder being mounted to another photovoltaic cell is connected with the back electrode on shady face.

5. a photovoltaic cell pattern welding equipment, is characterized in that: comprise towards the setting of photovoltaic cell shady face and pass to the Welding compound spraying coater of shady face spraying scaling powder, the welding draw off gear being wound with welding and the described welding of confession and the one side of welding smeared to the scaling powder application device of scaling powder.

6. photovoltaic cell pattern welding equipment as claimed in claim 5, is characterized in that: described scaling powder application device comprises one and is contained with the container of scaling powder and is placed in the sponge of described vessel surface, and the surface of described container is provided with the groove holding described sponge.

7. photovoltaic cell pattern welding equipment as claimed in claim 6, is characterized in that: described sponge to be placed in described groove and towards the bottom surface of described welding, to smear scaling powder to bottom surface.