A photovoltaic module

Abstract

The present invention discloses a photovoltaic module, which belongs to the technical field of back contact batteries, and includes a solder strip laying structure and an ultraviolet light irradiation structure; the solder strip laying structure includes a battery cell, solder paste and a solder strip, the solder paste is arranged around the back of the battery cell, and the solder strip is arranged on the solder paste; the ultraviolet light irradiation structure includes an ultraviolet light source, a tool, a pressure needle bar and a pressure needle, the tool is arranged at the top and bottom of the front of the ultraviolet light source, and the pressure needle bar is arranged on the left and right sides of the top and bottom of the front of the ultraviolet light source. The photovoltaic module effectively avoids the problem of battery cell deformation caused by high-temperature welding, reduces the high-temperature welding process of the solder strip, and has a simpler production process. After the battery cell is welded, it undergoes processes such as convergence and laying before being laminated, which greatly reduces the risk of hidden cracks in the battery cell. It not only effectively avoids the problem of battery cell deformation caused by high-temperature welding, but also reduces the high-temperature welding process of the solder strip, and the module production yield is high.

Description

Technical Field

[0001] The invention relates to the technical field of back contact batteries, and in particular to a photovoltaic module. Background Art

[0002] In the process of back contact battery welding interconnection in the prior art, the battery and the welding strip need to be subjected to a high temperature of more than 130 degrees Celsius to achieve the connection between the welding strip and the battery cell. Since the back contact battery is single-sided welding, there is a large stress on the welding strip after welding, which causes the battery cell to be greatly deformed. The deformation of the battery cell after welding has the following problems: ① After the battery cell is welded, it goes through the processes of convergence, laying, and then laminated. This process requires the deformed and bent battery cell to be forcibly flattened. There is a great risk of hidden cracks in the battery cell. At the same time, it is easy to cause the welding strip and the main grid line to fall off, resulting in poor contact, which leads to a decrease in the yield of the back contact battery assembly; ② The deformation of the battery cell after welding is directly related to the thickness of the silicon wafer. The thinner the silicon wafer is, the greater the deformation of the battery cell after welding, and the greater the risk of hidden cracks. Therefore, the welding process seriously affects the space for thinning the silicon wafer thickness, thereby affecting the cost reduction space of the battery cell.

[0003] The use of thermosetting insulating adhesive has the following defects:

[0004] 1. Since thermosetting insulating adhesive needs to be cured by high temperature heating, and the curing volatility of thermosetting insulating adhesive is 12% to 20%, after the thermosetting insulating adhesive is cured, the surface of the solar cell will produce stress due to the shrinkage of the thermosetting insulating adhesive, resulting in a warpage of the cell ≥3.5mm. The degree of warpage is large, which affects the performance of the solar cell;

[0005] 2. Since thermosetting insulating adhesive needs high temperature curing, high temperature curing will cause certain thermal attenuation loss to the power of solar cells;

[0006] 3. Since the thermosetting insulating adhesive is a two-component system, it needs to be manually mixed, stirred and centrifuged. There is a risk of forgetting to mix and stir glue A and glue B during manual operation. Therefore, the thermosetting insulating adhesive is inconvenient to use and requires a lot of manpower and material resources. Summary of the invention

[0007] In order to solve the problem of cell deformation caused by high-temperature welding of back-contact solar cells and the problem of thermal decay loss of solar cell power, the present invention provides a photovoltaic module, and the technical solution is as follows:

[0008] A photovoltaic module includes a welding strip laying structure and an ultraviolet light irradiation structure;

[0009] The solder strip laying structure includes a battery cell, solder paste and a solder strip, the number of the battery cells is two, the solder paste is arranged around the back of the two battery cells, and the solder strip is arranged on the solder paste;

[0010] The ultraviolet light irradiation structure includes an ultraviolet light source, a tooling, a pressing needle bar and a pressing needle. The ultraviolet light source is in the shape of a rectangle. The tooling is arranged at the top and bottom of the front of the ultraviolet light source. The pressing needle bar is arranged on the left and right sides of the top and bottom of the front of the ultraviolet light source. The pressing needle is arranged between the opposite sides of the tooling and the pressing needle bar.

[0011] It effectively avoids the problem of cell deformation caused by high-temperature welding, reduces the high-temperature welding process of the welding strip, and simplifies the production process.

[0012] Preferably, UV glue is printed on the positive main grid and the negative main grid of the battery cell, and the welding strip is connected to the two battery cells respectively through solder paste.

[0013] Preferably, the number of the solder pastes is several groups, and the number of the solder pastes in each group is several and is equidistantly distributed on the top and bottom of the back sides of the two battery cells.

[0014] Preferably, the number of the solder strips is a number of groups corresponding to the number of solder pastes, and the several groups of solder strips are divided into odd rows and even rows from top to bottom.

[0015] Preferably, the number of the odd-numbered rows of welding ribbons is two and they are respectively connected to the corresponding solder pastes on the two battery cells, and the opposite ends of the odd-numbered rows of welding ribbons extend to the outside of the two battery cells.

[0016] Preferably, the number of the even-numbered rows of solder ribbons is one and is connected to the corresponding solder pastes on the two battery cells, and the solder pastes on the two battery cells are connected in series through the solder ribbons.

[0017] Preferably, the wavelength of the ultraviolet light source is 365nm, the irradiation area is 240*260mm, and the irradiation intensity is 1000mw / cm 2 .

[0018] Preferably, the specifications of the welding strip are width: 0.6 mm, thickness: 0.2-0.25 mm.

[0019] UV glue is printed on the positive and negative main grids of the battery cell, and then an ultraviolet light source is used to cure the UV glue to fix the low-temperature solder tape to interconnect the back contact cells, resulting in a high yield in component production.

[0020] Beneficial effects:

[0021] The beneficial effects produced by the technical solution of the present invention are as follows:

[0022] 1. This photovoltaic module has UV glue printed on the positive and negative main grids of the battery cell, and then uses ultraviolet light to cure the UV glue to fix the low-temperature solder tape to interconnect the back contact cells. This effectively avoids the problem of battery cell deformation caused by high-temperature welding, reduces the high-temperature welding process of the solder tape, and has a high module production yield.

[0023] 2. This photovoltaic module effectively avoids the problem of cell deformation caused by high-temperature welding, reduces the high-temperature welding process of the welding strip, and makes the production process simpler. After the cells are welded, they are subjected to processes such as convergence and laying before being laminated, which greatly reduces the risk of hidden cracks in the cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the welding strip laying structure of a photovoltaic module of the present invention;

[0026] Figure 2 It is a schematic diagram of welding of a photovoltaic module of the present invention;

[0027] Figure 3 This is a wavelength diagram of ultraviolet light of a photovoltaic module of the present invention.

[0028] In the figure, 1. battery cell; 2. solder paste; 3. solder ribbon; 4. ultraviolet light source; 5. tooling; 6. press needle bar; 7. press needle. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, a photovoltaic module includes a welding ribbon laying structure and an ultraviolet light irradiation structure;

[0031] The solder strip laying structure includes a battery cell 1, solder paste 2 and a solder strip 3. The number of battery cells 1 is two. UV glue is printed on the positive main grid and the negative main grid of the battery cell 1. The solder paste 2 is arranged around the back of the two battery cells 1. The solder strip 3 is arranged on the solder paste 2. The specifications of the solder strip 3 are width: 0.6mm, thickness: 0.2~0.25mm. The solder strip 3 is connected to the two battery cells 1 respectively through the solder paste 2. The number of solder pastes 2 is several groups, and the number of solder pastes 2 in each group is several and is equidistantly distributed on the top and bottom of the back of the two battery cells 1. The number of solder strips 3 is several groups corresponding to the number of solder pastes 2.

[0032] Specifically, several groups of welding ribbons 3 are divided into odd rows and even rows from top to bottom. The number of welding ribbons 3 in odd rows is two and they are respectively connected to the corresponding solder pastes 2 on the two battery cells 1. The opposite ends of the welding ribbons 3 in odd rows extend to the outside of the two battery cells 1. The number of welding ribbons 3 in even rows is one and it is connected to the corresponding solder pastes 2 on the two battery cells 1. The solder pastes 2 on the two battery cells 1 are connected in series through the welding ribbons 3.

[0033] In this embodiment, the soldering tape 3 is laid on the main grid of the battery cell 1 through the solder paste 2 by using a soldering device.

[0034] like Figure 2-3 As shown, the ultraviolet light irradiation structure includes an ultraviolet light source 4, a tooling 5, a pressing needle strip 6 and a pressing needle 7. The ultraviolet light source 4 is in the shape of a rectangle. The tooling 5 is arranged at the top and bottom of the front side of the ultraviolet light source 4. The pressing needle strip 6 is arranged on the left and right sides of the top and bottom of the front side of the ultraviolet light source 4. The pressing needle 7 is arranged between the opposite sides of the tooling 5 and the pressing needle strip 6.

[0035] It should be noted that the wavelength of the ultraviolet light source 4 is 365nm, the irradiation area is 240*260mm, and the irradiation intensity is 1000mw / cm 2 .

[0036] In this embodiment, the ultraviolet light source 4 is used to irradiate and cure the UV glue to fix the low-temperature solder tape 3 to interconnect the back contact cells.

[0037] The present invention uses the following steps:

[0038] First, use the welding equipment to lay the welding strip 3 on the main grid of the battery cell 1 through the solder paste 2, and ensure that the distribution of the welding strip 3 is as follows: Figure 1 As shown, Figure 2 As shown, a press-screen-assisted ultraviolet light source 4 is used to irradiate and cure UV glue to fix the low-temperature solder tape 3 to interconnect the back contact cells.

[0039] The present invention prints UV glue on the positive main grid and the negative main grid, and then uses ultraviolet light to cure the UV glue to fix the low-temperature welding strip 3 to interconnect the back contact cells. This effectively avoids the problem of battery cell deformation caused by high-temperature welding, reduces the high-temperature welding process of the welding strip, makes the production process simpler, and has a high yield rate for component production.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: include: Welding tape laying structure and UV irradiation structure; The solder strip laying structure comprises a battery cell (1), solder paste (2) and a solder strip (3), the number of the battery cells (1) is two, the solder paste (2) is arranged around the back sides of the two battery cells (1), and the solder strip (3) is arranged on the solder paste (2); The ultraviolet light irradiation structure comprises an ultraviolet light source (4), a tooling (5), a pressing needle bar (6) and a pressing needle (7); the ultraviolet light source (4) is in the shape of a rectangle; the tooling (5) is arranged at the top and bottom of the front of the ultraviolet light source (4); the pressing needle bar (6) is arranged at the left and right sides of the top and bottom of the front of the ultraviolet light source (4); and the pressing needle (7) is arranged between the tooling (5) and the pressing needle bar (6) on opposite sides.

2. A photovoltaic module according to claim 1, characterized in that: UV glue is printed on the positive electrode main grid and the negative electrode main grid of the battery cell (1), and the welding strip (3) is connected to the two battery cells (1) respectively through solder paste (2).

3. A photovoltaic module according to claim 1, characterized in that: The solder paste (2) is present in a plurality of groups, and each group of the solder paste (2) is present in a plurality of groups and is evenly distributed on the top and bottom of the back sides of the two battery cells (1).

4. A photovoltaic module according to claim 3, characterized in that: The number of the solder strips (3) is a number of groups corresponding to the number of solder pastes (2), and the groups of solder strips (3) are divided into odd rows and even rows from top to bottom.

5. A photovoltaic module according to claim 4, characterized in that: The number of the odd-numbered rows of welding strips (3) is two and they are respectively connected to the corresponding solder pastes (2) on the two battery cells (1); the opposite ends of the odd-numbered rows of welding strips (3) extend to the outside of the two battery cells (1).

6. A photovoltaic module according to claim 4, characterized in that: The number of the even-numbered rows of solder strips (3) is one and is connected to the corresponding solder pastes (2) on the two battery cells (1); the solder pastes (2) on the two battery cells (1) are connected in series via the solder strips (3).

7. A photovoltaic module according to claim 1, characterized in that: The wavelength of the ultraviolet light source (4) is 365 nm, the irradiation area is 240*260 mm, and the irradiation intensity is 1000 mw / cm 2 .

8. A photovoltaic module according to claim 1, characterized in that: The specifications of the welding strip (3) are: width: 0.6 mm, thickness: 0.2-0.25 mm.

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