Photovoltaic cell and photovoltaic module

Abstract

The photovoltaic cell comprises a cell main body, at least two grid lines are arranged on the front surface and / or the back surface of the cell main body, at least one connecting part is arranged on at least one side surface of the cell main body along the direction of the grid lines, and the connecting part is electrically connected with the grid lines. The photovoltaic module further comprises at least two photovoltaic modules, and the connecting parts of the side faces of every two adjacent photovoltaic modules are electrically connected through an interconnection part. Compared with the prior art, the photovoltaic cell has the advantages that the photovoltaic cell is simple in structure, the interconnection piece is arranged on the side face of the photovoltaic cell, the conduction and connection effects are achieved, a traditional welding strip series welding interconnection mode is omitted, the defect that a welding strip makes contact with the edge of the cell is overcome, the hidden crack risk of the cell is greatly reduced, and meanwhile shielding of the welding strip is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic components, and specifically relates to a photovoltaic cell and a photovoltaic component. Background Art

[0002] With the rapid development and application of solar energy technology, photovoltaic modules, as a photoelectric conversion device, are widely used in the solar power generation industry. Photovoltaic cells are generally connected in series through welding strips. The positive and negative electrodes of photovoltaic cells are generally arranged on the front and back sides of photovoltaic cells, and some are arranged on the same side, such as BC cells. When the cells are welded in series, half of the welding strip is welded to the main grid on the front surface of a cell on the front side of the cell, and the other half is welded to the main grid on the back side of the adjacent cell on the back side of the cell. The welding strip in the gap between the cells needs to be bent to reduce the contact stress of the welding strip on the edge of the cell. Although the welding strip is bent at the gap between the cells, the welding strip will still contact the edge of the cell after lamination. Under the action of external force, there is a large contact stress between the welding strip and the edge of the cell, which is easy to cause damage or cracking of the cell. At the same time, the presence of the welding strip on the surface of the cell will block the sunlight from directly irradiating the surface of the cell, affecting the power generation performance of the photovoltaic cell. Therefore, it is very important to obtain a photovoltaic cell and photovoltaic module that overcome the above defects. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, on the one hand, the utility model provides a photovoltaic cell, including a cell body, wherein at least two grid lines are provided on the front and / or back of the cell body, and at least one connecting portion is provided on at least one side of the cell body along the direction of the grid lines, and the connecting portion is electrically connected to the grid lines.

[0004] The connection part may be: the grid line extends along the front and / or back of the battery body to the side of the battery body to form a connection part. Alternatively, the connection part may be additionally fixed to the side of the battery body, and the connection part and the grid line are electrically connected, and the connection method may be welding or other electrical connection methods such as wire connection.

[0005] The invention also includes at least one interconnection member, at least part of which is fixedly connected to at least one connecting portion and is electrically conductive. The interconnection member is used for electrical connection between two adjacent photovoltaic cells.

[0006] The interconnection member has the following modes: first, each of the connecting parts is fixed with an interconnection member.

[0007] Second, there are multiple grid lines on the front and / or back of the battery body, and there is only one interconnection piece, which is in the shape of a long strip, and the connecting parts located on the same side are fixed to the long strip interconnection piece.

[0008] When the positive and negative electrodes of the battery are located on both sides of the front and back of the photovoltaic battery: the grid line includes a first grid line and a second grid line, the first grid line is arranged on the front of the battery body, the second grid line is arranged on the front of the battery body, the connecting part includes a first connecting part and a second connecting part, the first connecting part electrically conducts the first grid line, the second connecting part electrically conducts the second grid line, and the first connecting part and the second connecting part are arranged on two sides of the battery body. For example, the first grid line forms the positive electrode, the second grid line forms the negative electrode, and the first connecting part of the previous photovoltaic cell is electrically connected to the second connecting part of the next photovoltaic cell to achieve series connection.

[0009] When the positive and negative electrodes of the battery are located on the same side of the photovoltaic cell: the grid line includes a third grid line and a fourth grid line, and the third grid line and the fourth grid line are both arranged on the front or back side of the battery body, and the connecting portion includes a third connecting portion and a fourth connecting portion, and the third connecting portion is electrically connected to the third grid line, and the fourth connecting portion is electrically connected to the fourth grid line, and the third connecting portion and the fourth connecting portion are arranged on two sides of the battery body. At this time, the third grid line and the fourth grid line form different electrodes. If multiple photovoltaic cells are connected in series, the negative electrode of the previous battery is connected to the positive electrode of the next photovoltaic cell, that is, the third grid line of the previous battery is connected to the fourth grid line of the next photovoltaic cell.

[0010] On the other hand, the present invention provides a photovoltaic module, comprising at least two of the above-mentioned photovoltaic cells, wherein the connecting parts on the sides of two adjacent photovoltaic modules are electrically connected through an interconnection part.

[0011] The interconnection part is solder, and the solder is welded to the connection parts located on both sides of the solder.

[0012] Alternatively, the interconnection portion is a conductive adhesive, and the conductive adhesive is bonded to the connection portions located on both sides of the conductive adhesive.

[0013] After the photovoltaic modules are connected in series, the photovoltaic modules formed by the photovoltaic cells connected in series can be packaged according to the existing photovoltaic module manufacturing process.

[0014] In the traditional ribbon welding connection method, the contact area between the ribbon and the edge of the battery is extremely small. Under a certain external force, stress concentration will occur at the contact position, and the contact stress at the edge of the battery where the ribbon contacts is large, and the battery cell is prone to cracking. The presence of the ribbon on the surface of the battery will affect the photovoltaic cell's absorption of sunlight. Compared with the traditional technology, the advantages of the utility model are: the utility model has a simple structure, and an interconnection member is set on the side of the photovoltaic cell to play a conductive and connecting role, eliminating the traditional ribbon welding interconnection method, eliminating the disadvantages of the ribbon contacting the edge of the battery, greatly reducing the risk of hidden cracks in the battery cell, and avoiding the shielding of the ribbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of a photovoltaic cell in one embodiment of the utility model, in which the positive and negative electrodes are located on both sides;

[0016] Figure 2 This is a three-dimensional diagram of a photovoltaic cell in accordance with a second embodiment of the utility model, in which the positive and negative electrodes are located on both sides;

[0017] Figure 3 This is a three-dimensional diagram of a photovoltaic cell in the third embodiment of the utility model, in which the positive and negative electrodes are located on both sides;

[0018] Figure 4 This is a three-dimensional diagram of a photovoltaic cell with positive and negative electrodes located on the same side of the utility model;

[0019] Figure 5 Is adopted Figure 1 or Figure 2 A schematic cross-sectional view of a photovoltaic module formed by a photovoltaic cell;

[0020] Figure 6 Is adopted Figure 3 A schematic cross-sectional view of a photovoltaic module formed by a photovoltaic cell;

[0021] Figure 7 Is adopted Figure 4 A top view of a photovoltaic module formed by photovoltaic cells.

[0022] Reference numerals:

[0023] 1 battery body; 101 grid line; 1011 first grid line; 1012 second grid line; 1013 third grid line; 1014 fourth grid line;

[0024] 1021 first connection part; 1022 second connection part; 1023 third connection part; 1024 fourth connection part;

[0025] 103 interconnects. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention and to more clearly define the scope of protection claimed by the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementation methods of the present invention, which are only part of the embodiments of the present invention, and the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of implementation of the present invention.

[0027] Referring to the accompanying drawings, the utility model adopts the following technical solutions. On the one hand, the utility model provides a photovoltaic cell, including a cell body 1, wherein at least two grid lines 101 are provided on the front and / or back of the cell body 1, and at least one connecting portion is provided on at least one side of the cell body 1 along the direction of the grid line 101, and the connecting portion is electrically connected to the grid line 101.

[0028] The above-mentioned direction along the gate line is the length direction along the gate line. Figure 1 In the left-right direction.

[0029] The connection part may be: the grid line 101 extends along the front and / or back of the battery body 1 to the side of the battery body 1 to form a connection part. Alternatively, the connection part may be additionally fixed to the side of the battery body 1, and the connection part and the grid line 101 are electrically connected, and the connection method may be welding or other electrical connection methods such as wire connection.

[0030] The above side is Figure 1 The left and right sides.

[0031] The device further comprises at least one interconnection member 103, wherein at least a portion of the interconnection member 103 is fixedly connected to at least one connection portion and is electrically conductive. The interconnection member 103 is used for electrical connection between two adjacent photovoltaic cells.

[0032] The interconnection member 103 has the following modes: first, each of the connecting parts is fixed with an interconnection member 103, such as Figure 2 shown.

[0033] Second, there are multiple grid lines 101 on the front and / or back of the battery body 1, and there is one interconnection member 103, which is in the shape of a long strip. The connecting parts on the same side are fixed to the long strip interconnection member 103, such as Figure 1 shown.

[0034] In a preferred embodiment, an interconnection 103 is provided on one side of each photovoltaic cell, which reduces consumables and can reduce costs. In other embodiments, interconnections 103 are provided on both sides of the photovoltaic cell, so that the two adjacent photovoltaic cells are fixed and electrically conductive by interconnections 103 and interconnections 103, which uses more consumables.

[0035] When the positive and negative electrodes of the battery are located on the front and back sides of the photovoltaic cell: the grid line 101 includes a first grid line 1011 and a second grid line 1012, the first grid line 1011 is arranged on the front side of the battery body 1, the second grid line 1012 is arranged on the front side of the battery body 1, the connecting part includes a first connecting part 1 and a second connecting part 2, the first connecting part 1 is electrically connected to the first grid line 1011, the second connecting part 2 is electrically connected to the second grid line 1012, and the first connecting part 1 and the second connecting part 2 are respectively arranged on two sides of the battery body 1. For example, the first grid line 1011 forms the positive electrode, the second grid line 1012 forms the negative electrode, and the first connecting part 1 of the previous photovoltaic cell is electrically connected to the second connecting part 2 of the next photovoltaic cell to achieve series connection. Figure 1 and Figure 2 As shown, a connection portion is formed for a gate line 101, such as Figure 3 As shown, two connection parts are formed for one gate line 101, but only one corresponding connection part of the adjacent surfaces is electrically connected through the interconnection member 103, and the other pair is not in contact.

[0036] When the positive and negative poles of the battery are located on the same side of the photovoltaic cell: the grid line 101 includes a third grid line 1013 and a fourth grid line 1014, and the third grid line 1013 and the fourth grid line 1014 are both arranged on the front or back side of the battery body 1, and the connecting portion includes a third connecting portion 3 and a fourth connecting portion 4, and the third connecting portion 3 electrically conducts the third grid line 1013, and the fourth connecting portion 4 electrically conducts the fourth grid line 1014, and the third connecting portion 3 and the fourth connecting portion 4 are respectively arranged on two sides of the battery body 1. At this time, the third grid line 1013 and the fourth grid line 1014 form different electrodes. If multiple photovoltaic cells are connected in series, the negative pole of the previous cell is connected to the positive pole of the next photovoltaic cell, that is, the third grid line 1013 of the previous cell is connected to the fourth grid line 1014 of the next photovoltaic cell. In this way, Figure 7 As shown, the grid lines 101 of two adjacent cells are staggered, that is, the structures of the photovoltaic cells spaced apart are the same.

[0037] On the other hand, the present invention provides a photovoltaic module, comprising at least two of the above-mentioned photovoltaic cells, wherein the connecting parts on the sides of two adjacent photovoltaic modules are electrically connected through an interconnection part.

[0038] The interconnection part is solder, and the solder is welded to the connection parts located on both sides of the solder.

[0039] Alternatively, the interconnection portion is a conductive adhesive, and the conductive adhesive is bonded to the connection portions located on both sides of the conductive adhesive.

[0040] After the photovoltaic modules are connected in series, the photovoltaic modules formed by the photovoltaic cells connected in series can be packaged according to the existing photovoltaic module manufacturing process.

[0041] In the traditional welding ribbon serial welding connection method, the contact area between the welding ribbon and the edge of the battery is extremely small. Under a certain external force, stress concentration will occur at the contact position, and the contact stress at the edge of the battery where the welding ribbon contacts is large, and the battery cell is prone to cracking; the presence of the welding ribbon on the surface of the battery will affect the photovoltaic cell's absorption of sunlight. Compared with the traditional technology, the advantages of the utility model are: the utility model has a simple structure, and an interconnection member 103 is arranged on the side of the photovoltaic cell to play a conductive and connecting role, canceling the traditional welding ribbon serial welding interconnection method, eliminating the disadvantages of the welding ribbon contacting the edge of the battery, greatly reducing the risk of hidden cracks in the battery cell, and avoiding the blocking of the welding ribbon.

[0042] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A photovoltaic cell, comprising a cell body (1), wherein at least two grid lines (101) are provided on the front and / or back of the cell body (1), characterized in that: At least one connecting portion is provided on at least one side surface of the battery body (1) along the direction of the gate line (101), and the connecting portion is electrically connected to the gate line (101).

2. The photovoltaic cell according to claim 1, characterized in that: The grid line (101) extends along the front and / or back side of the battery body (1) to the side of the battery body (1) to form a connection portion.

3. The photovoltaic cell according to claim 2, characterized in that: It also includes at least one interconnection member (103), wherein at least a portion of the interconnection member (103) is fixedly connected to at least one connection portion and is electrically conductive.

4. The photovoltaic cell according to claim 3, characterized in that: Each of the connecting parts is fixed with an interconnecting piece (103).

5. The photovoltaic cell according to claim 3, characterized in that: There are a plurality of grid lines (101) on the front and / or back of the battery body (1), there is only one interconnection member (103) in the shape of a long strip, and the connection parts located on the same side are fixed to the long strip interconnection member (103).

6. The photovoltaic cell according to any one of claims 1 to 5, characterized in that: The gate line (101) comprises a first gate line (1011) and a second gate line (1012); the first gate line (1011) is arranged on the front side of the battery body (1); the second gate line (1012) is arranged on the front side of the battery body (1); the connecting portion comprises a first connecting portion (1021) and a second connecting portion (1022); the first connecting portion (1021) is electrically connected to the first gate line (1011); the second connecting portion (1022) is electrically connected to the second gate line (1012); the first connecting portion (1021) and the second connecting portion (1022) are respectively arranged on two side surfaces of the battery body (1).

7. The photovoltaic cell according to any one of claims 1 to 5, characterized in that: The grid lines (101) include a third grid line (1013) and a fourth grid line (1014), and the third grid line (1013) and the fourth grid line (1014) are both arranged on the front side or the back side of the battery body (1), and the connecting portion includes a third connecting portion (1023) and a fourth connecting portion (1024), and the third connecting portion (1023) is electrically connected to the third grid line (1013), and the fourth connecting portion (1024) is electrically connected to the fourth grid line (1014), and the third connecting portion (1023) and the fourth connecting portion (1024) are respectively arranged on two side surfaces of the battery body (1).

8. A photovoltaic module, characterized in that: The photovoltaic module comprises at least two photovoltaic cells as claimed in any one of claims 1 to 7, wherein the connecting parts on the sides of two adjacent photovoltaic modules are electrically connected via an interconnection part.

9. The photovoltaic module according to claim 8, characterized in that: The interconnection part is solder, and the solder is welded to the connection parts located on both sides of the solder.

10. The photovoltaic module according to claim 8, characterized in that: The interconnection part is a conductive adhesive, and the conductive adhesive is bonded to the connection parts located on both sides of the conductive adhesive.

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