Photovoltaic module

Abstract

The utility model discloses a photovoltaic module which comprises a plurality of battery pieces, each battery piece is provided with a fine grid and a connecting piece, and the fine grids and the connecting pieces are perpendicular to each other and are electrically connected with each other. Adhesive films are arranged above the fine grids and located on the two sides of the connecting piece, grooves are formed in the positions, on the two sides of the connecting piece, of the adhesive films, and welding strips are arranged in the grooves and located above the connecting piece; the welding strips are electrically connected with the connecting pieces through welding, and the plurality of battery pieces are connected in series through the welding strips. According to the utility model, the grooves are formed by printing the adhesive films on the two sides of the connecting piece, and the solder strip is directly placed in the grooves to be fixed, so that the solder strip does not need to be fixed by dispensing or spreading adhesive in the grooves; therefore, the phenomena of inaccurate positioning of the welding strip and the grid line of the battery piece and virtual connection of the welding strip and the battery piece caused by a complicated process of dispensing and fixing the welding strip and heating and glue spreading are avoided; and the phenomena that the transmission resistance is increased and the process cost is increased due to the fact that the groove is designed on the pad point body are also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a photovoltaic component. Background Art

[0002] Photovoltaic modules absorb sunlight and convert solar radiation energy directly or indirectly into electricity through the photoelectric or photochemical effects. Photovoltaic module processing is a crucial component of the solar industry chain. Crystalline silicon modules are a key step in the development of solar cells, and the power generation efficiency of solar cell modules directly determines their quality. Module defects primarily arise from the serial soldering of cells. Therefore, the module's compliance rate depends primarily on the quality of the soldering ribbons and cells. Defects in solar cell modules primarily include splinters, hidden cracks, cold solder joints, open solder joints, over-solar joints, white spots, broken grids, short circuits, bubbles, foreign matter, and contamination. With the exception of a few defects like bubbles, the majority of defects likely originate from the soldering process.

[0003] In the prior art, glue dispensing or glue spreading is usually used to position the solder ribbon by heating or cooling. Glue dispensing uses a special conductive curing glue. When connected in series with the solder ribbon, the glue needs to be cured. Before curing, the glue is in liquid state, which is inconvenient to transport, and has high requirements for the glue dispensing process and is complicated. Glue spreading uses hot melt adhesive film to cover and fix the solder ribbon on the battery cell. However, the laid battery string often has thermal stress release during hot pressing, resulting in the need to release the thermal stress after cold pressure relief. At this time, the bonded material (battery cell) will produce warping. The whole surface of the tool is pressed on the upper surface of the film. When the film is heated, the film itself will soften or even deform, making the soldering ribbon easily offset by the film, resulting in inaccurate positioning of the soldering ribbon and the grid line of the battery cell, and virtual connection between the soldering ribbon and the battery cell. In addition, when the film is heated, the molten film is easy to flow between the soldering ribbon and the battery cell, causing the soldering points on the soldering ribbon and the battery cell to separate, resulting in insulation between the soldering ribbon and the battery cell, affecting the quality of the battery string.

[0004] In the prior art, there is also a method of fixing the solder strip by designing a groove on the pad body. Since the groove design increases the amount of solder paste used, on the one hand, it increases the process cost, and on the other hand, it also increases the thickness and width of the pad body, which increases the transmission resistance and reduces the output current. Utility Model Content

[0005] The present invention aims to solve the above problems, remedy the deficiencies of the prior art, and provide a photovoltaic module to solve the problems arising from the above background technology.

[0006] The technical solution of the present utility model is: a photovoltaic module, including multiple battery cells, each of which is provided with a fine grid and a connector, the fine grid and the connector are perpendicular to each other and electrically connected; an adhesive film is provided above the fine grid and on both sides of the connector, the adhesive film forms grooves on both sides of the connector, and a welding strip is provided in the groove and above the connector; the welding strip is electrically connected to the connector by welding, and multiple battery cells are connected in series through the welding strip.

[0007] Furthermore, the connecting member is a main grid or a pad point.

[0008] Furthermore, the width of the groove is equal to the width of the welding strip, and the depth of the groove is greater than the thickness of the connecting piece and less than the thickness of the welding strip.

[0009] Furthermore, the adhesive film is a transparent adhesive film.

[0010] Furthermore, the number of the grooves is equal to the number of the welding strips.

[0011] Furthermore, the cross-sectional shape of the welding strip is the same as the cross-sectional shape of the groove.

[0012] Furthermore, the height of the connecting member is greater than the height of the fine grid.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The utility model forms grooves by printing adhesive film on both sides of the connector, and directly places the soldering tape in the grooves to fix the soldering tape. The electrical connection between the soldering tape and the connector is achieved by welding, and the connection between the cells is formed into a photovoltaic module by connecting the soldering tape in series. Using adhesive film to form grooves to fix the soldering tape, on the one hand, does not require dispensing or spreading glue in the grooves to fix the soldering tape, thus avoiding the complex process of dispensing glue to fix the soldering tape and the phenomenon of inaccurate positioning of the soldering tape and the grid line of the cell and virtual connection of the soldering tape and the cell due to heating and spreading glue; on the other hand, it also avoids the increase in transmission resistance and process cost caused by designing grooves on the pad body.

[0015] (2) The groove design of the present invention is applicable to battery cells with main grids and battery cells without main grids. When the battery cell has a main grid, the connecting member is the main grid, and the adhesive film is printed on both sides of the main grid to form grooves, and the main grid and the welding strip are welded together by direct welding to achieve electrical connection; when the battery cell is a battery cell without main grids, the connecting member is the pad point, and the adhesive film is printed on both sides of the pad point to form grooves, and the pad point and the welding strip are welded together by direct welding to achieve electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic cross-sectional view of a battery cell;

[0017] Figure 2 This is a schematic diagram of battery cell connection;

[0018] Figure 3 Schematic diagram of a cell with a connector as the main grid;

[0019] Figure 4 Schematic diagram of a battery cell with a pad point as the connection part;

[0020] In the figure: 1-battery cell, 2-fine grid, 3-connector, 31-main grid, 32-pad point, 4-film, 5-groove, 6-solder ribbon. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0022] like Figure 1 、 Figure 2 As shown, a photovoltaic module in this embodiment includes a plurality of battery cells 1, each of which is provided with a fine grid 2 and a connector 3, the fine grid 2 and the connector 3 being perpendicular to each other and electrically connected; an adhesive film 4 is provided above the fine grid 2 and on both sides of the connector 3, the adhesive film 4 forms a groove 5 on both sides of the connector 3, and a welding strip 6 is provided in the groove 5 and above the connector 3; the welding strip 6 is electrically connected to the connector 3 by welding, and the plurality of battery cells 1 are connected in series through the welding strip 6.

[0023] The present invention forms grooves 5 by printing adhesive film 4 on both sides of the connector 3, directly placing the soldering ribbon 6 in the grooves 5 to secure the soldering ribbon 5. Electrical connection between the soldering ribbon 6 and the connector 3 is achieved through welding, and the solar cells 1 are connected in series through the soldering ribbon 6 to form a photovoltaic module. Using the adhesive film 4 to form the grooves 5 to secure the soldering ribbon 6 eliminates the need for dispensing or spreading glue in the grooves to secure the soldering ribbon, thus avoiding the complex process of dispensing glue to secure the soldering ribbon and the phenomenon of inaccurate positioning of the soldering ribbon and the solar cell grid lines, as well as the phenomenon of virtual connection between the soldering ribbon and the solar cell, which would otherwise occur due to designing grooves on the pad body.

[0024] Specifically, in some embodiments of the present invention, the connector 3 is a main grid 31 or a pad point 32. The groove 5 of the present invention is suitable for cells with a main grid and cells without a main grid, such as Figure 3 As shown, when the cell has a main grid 31, the connecting member 3 is the main grid 31, and the adhesive film 4 is printed on both sides of the main grid 31 to form a groove 5, and the main grid 31 and the welding ribbon 6 are welded by direct welding to achieve electrical connection; Figure 4 As shown, when the cell is a busbar-less cell, the connector is the pad point 32, and the adhesive film 4 is printed on both sides of the pad point 32 to form a groove 5, and the pad point 32 and the welding ribbon 6 are welded by direct welding to achieve electrical connection.

[0025] Specifically, in some embodiments of the present invention, the width of the groove 5 is equal to the width of the welding strip 6, and the depth of the groove 5 is greater than the thickness of the connector 3 and less than the thickness of the welding strip 6. In the present invention, to allow the welding strip 6 to fit more snugly into the groove 5, the width of the groove 5 is equal to the width of the welding strip 6; since the welding strip 6 is arranged above the connector 3 and may move, in order to better fix the welding strip 6, the depth of the groove 5 is greater than the thickness of the connector 3 and less than the thickness of the welding strip 6.

[0026] Specifically, in some embodiments of the present invention, the adhesive film 4 is transparent. In the present invention, the adhesive film 4 is transparent and does not block the front of the photovoltaic cell 1, nor does it affect the photovoltaic cell 1's absorption of light energy.

[0027] Specifically, in some embodiments of the present invention, the number of the grooves 5 is equal to the number of the welding strips 6. In the present invention, the number of the grooves 5 can be designed according to the number of welding strips 6, and the positions are one-to-one corresponding to each other, in order to accurately fix the welding strips 6.

[0028] Specifically, in some embodiments of the present invention, the cross-sectional shape of the welding strip 6 is the same as the cross-sectional shape of the groove 5. In the present invention, the shape of the groove 5 can be designed according to the shape of the welding strip 6 to ensure that the welding strip 6 can be well fixed and attached to the groove 5.

[0029] Specifically, in some embodiments of the present invention, the height of the connector 3 is greater than the height of the fine grid 2. In the present invention, the height of the connector 3 is set to be greater than the height of the fine grid 2, so that the connector 3 can form a good contact with the welding ribbon 6, and the phenomenon of cold joints and empty joints between the welding ribbon 6 and the connector 3 can be avoided during welding.

[0030] The above further describes the present invention with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A photovoltaic module, characterized in that: It comprises a plurality of battery cells, each of which is provided with a fine grid and a connector, the fine grid and the connector are perpendicular to each other and electrically connected; an adhesive film is provided above the fine grid and on both sides of the connector, the adhesive film forms grooves on both sides of the connector, a welding strip is provided in the groove and above the connector; the welding strip is electrically connected to the connector by welding, and a plurality of battery cells are connected in series via the welding strip.

2. A photovoltaic module according to claim 1, characterized in that: The connecting member is a main grid or a pad point.

3. A photovoltaic module according to claim 1, characterized in that: The width of the groove is equal to the width of the welding strip, and the depth of the groove is greater than the thickness of the connecting piece and less than the thickness of the welding strip.

4. A photovoltaic module according to claim 1, characterized in that: The adhesive film is a transparent adhesive film.

5. A photovoltaic module according to claim 1, characterized in that: The number of the grooves is equal to the number of the welding strips.

6. A photovoltaic module according to claim 1, characterized in that: The cross-sectional shape of the welding strip is the same as the cross-sectional shape of the groove.

7. A photovoltaic module according to claim 1, characterized in that: The height of the connecting member is greater than the height of the fine grid.

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