Connecting piece and photovoltaic module

Abstract

The connecting piece comprises a conductive substrate, the conductive substrate is provided with a first mounting groove and a second mounting groove, so that the conductive substrate is Z-shaped, and the inner wall of the first mounting groove and the inner wall of the second mounting groove are respectively provided with at least one solder layer. The solder layer is coated on the surface of the conductive substrate. The photovoltaic cell series connection structure further comprises at least two photovoltaic cells, at least one grid line is arranged on the surface of each photovoltaic cell, the photovoltaic cell series connection structure further comprises the connecting piece, and the two welding flux layers of the connecting piece are welded to the grid lines of the two adjacent photovoltaic cells respectively so that the two adjacent photovoltaic cells can be connected in series to form the photovoltaic cell series connection structure. Metal grid lines for collecting current are arranged on the front surface and the back surface of an existing photovoltaic cell. The photovoltaic cell connecting piece is simple in structure, the flexible connecting piece is connected with the cell pieces through the solder layer, the conductive and connecting effects are achieved, a traditional thin solder strip series welding mode is changed, the defect that a solder strip makes contact with the edge of a photovoltaic cell is overcome, and the hidden crack risk of the photovoltaic cell is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cells, and particularly relates to a connecting piece and a photovoltaic module. Background Art

[0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. The grid line is an important part of the cell, which is responsible for leading the photo-generated current in the cell body to the outside of the cell. When traditional photovoltaic cells are connected in series, a welding strip is used for series welding. The contact area between the welding strip and the edge of the cell is small. Under the action of external force, stress concentration will occur at the contact position, and the contact stress at the contact between the welding strip and the edge of the cell is large, and the cell is prone to hidden cracks. Therefore, it is very important to obtain a connecting piece and a photovoltaic module that overcome the above defects. Summary of the Utility Model

[0003] To solve the above at least one technical problem, on the one hand, the utility model provides a connecting piece, which includes a conductive matrix. The conductive matrix is configured with a first installation groove and a second installation groove to make the conductive matrix in a Z shape, and at least one solder layer is provided on the inner walls of the first installation groove and the second installation groove.

[0004] The conductive matrix includes a first connecting piece and second and third connecting pieces respectively arranged on both sides of the first connecting piece. A first installation groove is formed between the first outer wall of the first connecting piece and the first outer wall of the second connecting piece, and a second installation groove is formed between the first outer wall of the third connecting piece and the second outer wall of the first connecting piece.

[0005] Among them, the conductive matrix is made of an ultra-thin conductive metal, such as a good conductive metal like copper or aluminum, so that the conductive matrix has flexibility.

[0006] There are various ways to provide the solder layer. One way is that the solder layer is coated on the surface of the conductive matrix.

[0007] Another way is that the solder layer includes a first solder layer, and the first solder layer is arranged on the first outer wall of the first connecting piece and the first outer wall of the second connecting piece, and the two first solder layers are connected or spaced apart;

[0008] The solder layer includes a second solder layer, and the second solder layer is arranged on the first outer wall of the third connecting piece and the second outer wall of the first connecting piece, and the two second solder layers are connected or spaced apart.

[0009] Among them, the thickness of the conductive matrix does not exceed 0.3 mm

[0010] On the other hand, the present invention provides a photovoltaic module, which includes at least two photovoltaic cells. At least one grid line is provided on the surface of the photovoltaic cell. The photovoltaic module further includes the above-mentioned connecting member. The two solder layers of the connecting member are respectively welded to the grid lines of two adjacent photovoltaic cells to connect the two adjacent photovoltaic cells in series, forming a photovoltaic cell series structure. The front and back surfaces of existing photovoltaic cells both have metal grid lines for collecting current. The connecting member connects the front and back surfaces of adjacent photovoltaic cells in series in turn.

[0011] The solder layer is welded to the metal grid line through high temperature, which can ensure the current conduction between the series-connected photovoltaic cells.

[0012] The grid lines at the ends of two adjacent photovoltaic cells are respectively welded to the solder layers located in the first installation groove and the second installation groove of the connecting member.

[0013] An encapsulation adhesive film is provided outside the photovoltaic cell series structure, and outer plates are fixed on both sides of the encapsulation adhesive film.

[0014] The conductive substrate is a conductive metal sheet to make the conductive substrate flexible.

[0015] Wherein, the longitudinal length of the connecting member is consistent with the length of the photovoltaic cell, generally 182 mm to 210 mm, and the contact overlap width between the connecting member and the photovoltaic cell is generally between 3 mm and 8 mm; therefore, the connecting member and the edge surface of the photovoltaic cell are in complete surface contact, having a large contact area; when subjected to a certain external force, the contact stress between the connecting member and the photovoltaic cell is small, and the contact stress is much smaller than the concentrated contact stress generated by the traditional thin solder strip connection method, reducing the risk of hidden cracks in the photovoltaic cell.

[0016] Compared with the prior art, the advantages of the present utility model are as follows: The structure of the present utility model is simple. The flexible connecting member connects the battery chips through the solder layer, playing a role in conducting electricity and connecting, changing the traditional series soldering method of thin solder strips, eliminating the disadvantages of the solder strip contacting the edge of the photovoltaic cell, and greatly reducing the risk of hidden cracks in the photovoltaic cell. Description of the Drawings

[0017] Figure 1 It is a three-dimensional cross-sectional view of the connecting member of the present utility model;

[0018] Figure 2 It is a three-dimensional view of the connecting member of another embodiment of the present utility model;

[0019] Figure 3 It is a three-dimensional view of the connecting member of yet another embodiment of the present utility model;

[0020] Figure 4 It is a three-dimensional view of the connecting member of the present utility model connecting photovoltaic cells;

[0021] Figure 5It is a schematic cross-sectional view of the photovoltaic module of the present utility model;

[0022] Reference numerals:

[0023] 01 Connector; 011 Solder layer; 0111 First solder layer; 0112 Second solder layer; 012 Conductive substrate;

[0024] 02 Photovoltaic cell; 021 Grid line;

[0025] 03 Encapsulation film; 041 Front cover plate; 042 Back backplane;

[0026] 051 First installation groove; 052 Second installation groove;

[0027] 061 First connector; 0611 First outer wall of the first connector; 0612 Second outer wall of the first connector; 062 Second connector; 0621 First outer wall of the second connector; 063 Third connector; 0631 First outer wall of the third connector. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the present utility model and thus more clearly define the scope of protection required by the present utility model, the present utility model will be described in detail below with respect to certain specific embodiments of the present utility model. It should be noted that the following are only some specific implementation manners of the concept of the present utility model, which are only a part of the embodiments of the present utility model. The specific and direct descriptions of the relevant structures are only for the convenience of understanding the present utility model, and the specific features do not of course and directly limit the scope of implementation of the present utility model.

[0029] Referring to the attached drawings, the present utility model adopts the following technical solutions. On the one hand, the present utility model provides a connector 01, which includes a conductive substrate 012. The conductive substrate 012 is configured with a first installation groove 051 and a second installation groove 052, so that the conductive substrate 012 is in a Z shape. At least one solder layer 011 is provided on the inner walls of the first installation groove 051 and the second installation groove 052.

[0030] The conductive substrate 012 includes a first connector 061 and second connectors 062 and third connectors 063 respectively disposed on both sides of the first connector 061. A first installation groove 051 is formed between the first outer wall 0611 of the first connector and the first outer wall 0621 of the second connector, and a second installation groove 052 is formed between the first outer wall 0631 of the third connector and the second outer wall 0612 of the first connector.

[0031] In this embodiment, the first connector 061 and the second connector 062 are perpendicular, and the third connector 063 and the first connector 061 are perpendicular. In other implementation manners, other angles can be adopted.

[0032] Among them, the conductive substrate 012 uses an ultra-thin conductive metal, such as a good conductive metal like copper or aluminum, so that the conductive substrate 012 has flexibility.

[0033] Among them, there are multiple ways to provide the solder layer 011. One way is that the solder layer 011 is coated on the surface of the conductive substrate 012, as Figure 1 shown.

[0034] Another way is that the solder layer 011 includes a first solder layer 0111. The first solder layer 0111 is disposed on the first outer wall 0611 of the first connector and the first outer wall 0621 of the second connector. The two first solder layers 0111 are connected or spaced apart;

[0035] The solder layer 011 includes a second solder layer 0112. The second solder layer 0112 is disposed on the first outer wall 0631 of the third connector and the second outer wall 0612 of the first connector. The two second solder layers 0112 are connected or spaced apart.

[0036] Among them, as Figure 2 shown, the first solder layer 0111 is disposed on the first outer wall 0621 of the second connector, the second solder layer 0112 is disposed on the first outer wall 0631 of the third connector, and the adjacent first solder layers 0111 and the adjacent second solder layers 0112 are spaced apart.

[0037] Among them, as Figure 3 shown, the first solder layer 0111 is disposed on the first outer wall 0611 of the first connector and the first outer wall 0621 of the second connector, and the two first solder layers 0111 are connected; the second solder layer 0112 is disposed on the first outer wall 0631 of the third connector and the second outer wall 0612 of the first connector, and the two second solder layers 0112 are connected.

[0038] Among them, the thickness of the conductive substrate 012 does not exceed 0.3 mm

[0039] On the other hand, the present invention provides a photovoltaic module, including at least two photovoltaic cells 02. At least one grid line 021 is provided on the surface of the photovoltaic cell 02. The photovoltaic module further includes the above-mentioned connector 01. The two solder layers 011 of the connector 01 are respectively welded to the grid lines 021 of two adjacent photovoltaic cells 02 so that the two adjacent photovoltaic cells 02 are connected in series to form a series structure of the photovoltaic cells 02. The front and back surfaces of the existing photovoltaic cells 02 both have metal grid lines 021 for collecting current. The connector 01 connects the front and back surfaces of the adjacent photovoltaic cells 02 in series in turn.

[0040] The solder layer 011 is welded to the metal grid line 021 through high temperature, which can ensure the current conduction between the series-connected photovoltaic cells 02.

[0041] The grid lines 021 at the ends of two adjacent photovoltaic cells 02 are respectively welded to the solder layers 011 in the first installation groove 051 and the second installation groove 052 of the connector 01.

[0042] The present utility model uses an existing structure for encapsulation, that is, an encapsulation adhesive film 03 is provided outside the series connection structure of the photovoltaic cells 02, and outer plates are fixed on both sides of the encapsulation adhesive film 03. Among them, the outer plates include a front cover plate 041 and a back back plate 042.

[0043] Among them, the longitudinal length of the connector 01 is consistent with the length of the photovoltaic cell 02, generally 182 mm to 210 mm, and the contact overlap width between the connector 01 and the photovoltaic cell 02 is generally between 3 mm and 8 mm; therefore, the connector 01 and the edge surface of the photovoltaic cell 02 are in complete surface contact, having a large contact area; when subjected to a certain external force, the contact stress between the connector 01 and the photovoltaic cell 02 is small, and its contact stress is much smaller than the concentrated contact stress generated by the traditional thin solder strip connection method, reducing the risk of hidden cracks in the photovoltaic cell 02.

[0044] Among them, the first connector 01, the second connector 062, and the third connector 063 are integrally formed, and the solder layer 011 is fixed on the surface of the conductive substrate 012.

[0045] The conductive substrate 012 is a conductive metal sheet so that the conductive substrate 012 has flexibility.

[0046] Compared with the prior art, the advantages of the present utility model are as follows: The structure of the present utility model is simple. The flexible connector 01 connects the battery chips through the solder layer 011, playing a role in conduction and connection, changing the traditional series soldering method of thin solder strips, eliminating the disadvantages of the solder strip contacting the edge of the photovoltaic cell 02, and greatly reducing the risk of hidden cracks in the photovoltaic cell 02.

[0047] So far, the technical solutions of the present utility model have been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will all fall within the protection scope of the present utility model.

Claims

1. A connector, characterized in that: The conductive substrate (012) is provided with a first mounting groove (051) and a second mounting groove (052), so that the conductive substrate (012) is in a Z shape, and at least one solder layer (011) is provided on the inner walls of the first mounting groove (051) and the second mounting groove (052).

2. The connector according to claim 1, characterized in that: The conductive substrate (012) includes a first connecting member (061) and a second connecting member (062) and a third connecting member (063) respectively arranged on both sides of the first connecting member (061); a first mounting groove (051) is formed between a first outer wall (0611) of the first connecting member and a first outer wall (0621) of the second connecting member; and a second mounting groove (052) is formed between a first outer wall (0631) of the third connecting member and a second outer wall (0612) of the first connecting member.

3. The connector according to claim 1, characterized in that: The solder layer (011) is coated on the surface of the conductive substrate (012).

4. The connector according to claim 2, characterized in that: The solder layer (011) comprises a first solder layer (0111), and the first solder layer (0111) is at least arranged on a first outer wall (0621) of the second connecting member.

5. The connector according to claim 2, characterized in that: The solder layer (011) comprises a second solder layer (0112), and the second solder layer (0112) is at least arranged on the first outer wall (0631) of the third connecting member.

6. The connector according to any one of claims 1 to 5, characterized in that: The conductive substrate (012) is a conductive metal sheet so that the conductive substrate (012) has flexibility.

7. A photovoltaic module, comprising at least two photovoltaic cells (02), wherein at least one grid line (021) is provided on the surface of the photovoltaic cell (02), characterized in that: The invention comprises a connector (01) as claimed in any one of claims 1 to 6, wherein the two solder layers (011) of the connector (01) are respectively welded to the grid lines (021) of two adjacent photovoltaic cells (02) so that the two adjacent photovoltaic cells (02) are connected in series to form a photovoltaic cell (02) series structure.

8. The photovoltaic module according to claim 7, characterized in that: The grid lines (021) at the ends of two adjacent photovoltaic cells (02) are respectively welded to the solder layers (011) located in the first mounting groove (051) and the second mounting groove (052) of the connector (01).

9. The photovoltaic module according to claim 7, characterized in that: The photovoltaic cells (02) are connected in series and are provided with a packaging film (03) outside the packaging film (03), and outer plates are fixed on both sides of the packaging film (03).

10. The photovoltaic module according to claim 7, characterized in that: The length of the connecting member (01) is consistent with the length of the photovoltaic cell (02).

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