Photovoltaic panels and photovoltaic systems

Abstract

The present invention discloses a photovoltaic module and a photovoltaic system. The photovoltaic module includes a battery cell, an interconnection member, and a bonding layer. The battery cell has a plurality of fine grids extending in a first direction and arranged at intervals in a second direction. The interconnection member and the battery cell are fixed and electrically connected through the bonding layer. The bonding layer includes a first bonding member and a second bonding member. A first bonding member connects the interconnection member and at least two fine grids near the edge of the battery cell, and a second bonding member connects the interconnection member and a single fine grid. In an embodiment of the present invention, a single first bonding member electrically connects at least two fine grids, which can increase the size of the first bonding member, thereby increasing the contact area between the interconnection member and the first bonding member, and can improve the fixing reliability of the end of the interconnection member.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic component and a photovoltaic system. Background Art

[0002] Photovoltaic modules include cells and welding strips, which are used to interconnect the cells. Busbarless cells only have fine grids and no busbars. The edges of busbarless cells are usually provided with terminal connection wires to collect charges at the edges of busbarless cells.

[0003] However, when the above-mentioned busbar-less solar cell is connected to the welding ribbon, the fixing reliability of the portion of the welding ribbon located at the edge of the busbar-less solar cell is poor. Summary of the invention

[0004] The present invention provides a photovoltaic module and a photovoltaic system, aiming to at least solve the technical problem in the prior art that the fixing reliability of the portion of the welding strip located at the edge of the main grid-free solar cell is poor.

[0005] An embodiment of the present invention provides a photovoltaic module, including a cell, an interconnection member, and a bonding layer, wherein the cell has a plurality of fine grids extending along a first direction and arranged at intervals along a second direction;

[0006] The interconnection member and the battery cell are fixed and electrically connected via the bonding layer, and the bonding layer includes a first bonding member and a second bonding member;

[0007] The first bonding member connects the interconnection member and at least two of the fine grids near the edge of the battery cell;

[0008] A second bonding member connects the interconnection member and the single fine gate.

[0009] In the embodiment of the present invention, a single first bonding member electrically connects at least two fine grids, which can increase the size of the first bonding member compared to connecting only one fine grid, thereby increasing the contact area between the interconnection member and the first bonding member, improving the reliability of the end of the interconnection member, and reducing the reliability problems caused by shaking, offset, process errors, etc. at the end of the interconnection member. In addition, during the process of interconnecting the interconnection member and the battery cell, the first bonding member supports the end of the interconnection member, which can reduce the problem of cold solder joints caused by the end of the interconnection member being suspended in the air.

[0010] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A schematic diagram of a partial structure of a photovoltaic module provided in an embodiment of the present invention Figure 1 ;

[0012] Figure 2 A schematic diagram of a partial structure of a photovoltaic module provided in an embodiment of the present invention Figure 2 ;

[0013] Figure 3 A schematic diagram of a partial structure of a photovoltaic module provided in an embodiment of the present invention Figure 3 ;

[0014] Figure 4 A schematic diagram of a partial cross-sectional structure of a photovoltaic module provided by an embodiment of the present invention;

[0015] Figure 5 A schematic diagram of the structure of a cell in a photovoltaic module provided by an embodiment of the present invention;

[0016] Figure 6 A schematic diagram of a printing pattern of a bonding layer in a photovoltaic module provided by an embodiment of the present invention;

[0017] Figure 7 A schematic diagram of a printing pattern of another bonding layer in a photovoltaic module provided in an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1-battery cell, 11-fine grid, 12-connecting part, 121-first connecting part, 122-second connecting part, 2-joining layer, 21-first joining member, 211-first part, 212-second part, 22-second joining member, 3-interconnecting member, 4-insulating member. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0021] Reference Figures 1 to 4 An embodiment of the present invention discloses a photovoltaic module, which includes a cell 1, an interconnection member 3, and a bonding layer 2. The cell 1 has a plurality of fine grids 11 extending along a first direction and arranged at intervals along a second direction; the interconnection member 3 and the cell 1 are fixed and electrically connected through the bonding layer 2, and the bonding layer 2 includes a first bonding member 21 and a second bonding member 22; a first bonding member 21 connects the interconnection member 3 and at least two fine grids 11 near the edge of the cell 1; a second bonding member 22 connects the interconnection member 3 and a single fine grid 11.

[0022] Among them, the battery cell 1 can be a battery cell without a main grid, that is, a fine grid 11 is set on the battery cell 1, and the main grid line is removed, which can save the slurry consumed by the main grid line. The battery cell 1 can specifically be a battery cell without a main grid back contact, or a battery cell with double-sided electrodes without a main grid. Multiple battery cells 1 are connected in series to form a photovoltaic module through an interconnection member 3. The interconnection member 3 can be a welding strip or a coated welding strip, wherein the welding strip is a flat welding strip or a round welding strip, and the welding strip can also be set to a welding strip of other shapes according to actual needs. The welding strip can be a tinned welding strip. The battery cell 1 and the interconnection member 3 are welded through the bonding layer 2.

[0023] The spacing between two adjacent fine grids 11 can be 0.8 mm to 1 mm. When the battery cell is a back contact battery cell, the plurality of fine grids 11 include a plurality of positive fine grids and a plurality of negative fine grids, and the plurality of positive fine grids and the plurality of negative fine grids are arranged alternately along the second direction. Figure 1 , Figure 5 and Figure 6 The direction indicated by the arrow A in the middle, the second direction can refer to Figure 1 , Figures 4 to 6 The second direction is preferably perpendicular to the first direction as shown by the arrow B.

[0024] Both the first bonding member 21 and the second bonding member 22 can be conductive glue or conductive paste. A first bonding member 21 connects at least two fine grids 11 near the edge of the battery cell 1 along the second direction, and the number of fine grids 11 electrically connected by the first bonding member 21 can be 2, 3, 4, 5, etc. The first bonding members 21 in the bonding layer 2 are spaced apart, the second bonding members 22 are spaced apart, and the first bonding member 21 is spaced apart from the second bonding member 22. The shapes of the first bonding member 21 and the second bonding member 22 can be square, square with rounded corners, trapezoidal, waist-shaped, elliptical, etc. The size of the first bonding member 21 along the first direction is preferably larger than the size of the second bonding member 22 along the first direction, which can increase the contact area between the first bonding member 21 and the fine grid 11.

[0025] In the embodiment of the present invention, a single first bonding member 21 electrically connects at least two fine grids 11. Compared with connecting only one fine grid 11, the size of the first bonding member 21 can be increased, thereby increasing the contact area between the interconnection member 3 and the first bonding member 21, improving the reliability of the end of the interconnection member 3, and reducing the reliability problems caused by shaking, offset, process errors, etc. at the end of the interconnection member 3. In addition, during the interconnection between the interconnection member 3 and the battery cell 1, the first bonding member 21 supports the end of the interconnection member 3, which can reduce the problem of cold solder joints caused by the end of the interconnection member 3 being suspended in the air.

[0026] It should be noted that the bonding layer 2 may be a single-layer structure or a multi-layer structure. When the bonding layer 2 is a multi-layer structure, its mechanical stability can be improved.

[0027] In some embodiments, reference Figures 1 to 3 , along the second direction, the first bonding member 21 intersects with at least two fine grids 11 .

[0028] When the bonding layer 2 is printed, it can be printed according to Figure 6 After printing, the first bonding member 21 intersects with at least two fine grids, and its length covers at least two fine grids 11. When the bonding layer 2 is printed, it can also be printed according to Figure 7 The printed pattern shown is printed. During the interconnection process between the interconnector 3 and the battery cell 1, multiple small bonding pieces located at the edge of the battery cell 1 will melt and connect into a whole large first bonding piece 21. After the interconnection between the interconnector 3 and the battery cell 1 is completed, the first bonding piece 21 intersects with at least two fine grids, and its length covers at least two fine grids 11.

[0029] In the related art, the edge of the busbar-free cell is usually provided with an end connection line to collect the charge at the edge of the busbar-free cell. However, the provision of the end connection line will increase the cost and process, and will reduce the effective light absorption area of ​​the cell. In this embodiment, the length of the first joint 21 covers at least two fine grids 11. On the one hand, through the design of the first joint 21, even if the length of the interconnection member 3 is insufficient or swinging, the first joint 21 can realize the effective welding of the interconnection member and the fine grid 11 in the edge area of ​​the cell 1, which can avoid the interconnection member 3 from being connected to the outermost fine grid, thereby improving the current collection efficiency of the edge area; on the other hand, it can realize the vertical current conduction of at least two fine grids 11 at the edge, thereby reducing the current transmission distance and improving the current transmission efficiency. In addition, the first joint 21 itself can directly realize the electrical connection with at least two fine grids 11, without the need to provide an end connection line. Compared with the method of providing an end connection line, it can save electrode slurry, thereby saving costs, and can avoid the occupation of the light absorption area of ​​the cell 1 by the end connection line, thereby improving the effective light absorption area of ​​the cell 1.

[0030] In some embodiments, reference Figures 1 to 3 , the number of fine grids 11 electrically connected to the first bonding member 21 is 3-5. The number of fine grids 11 electrically connected to the first bonding member 21 can be 3, 4, or 5. The edge region of the battery cell 1 has relatively more defects, and the carrier density is lower than that in the middle region. In this embodiment, the 3-5 fine grids 11 in the edge region efficiently collect current through the first bonding member 21, which can improve the current collection efficiency in the edge region, thereby further improving the overall current collection efficiency, and balancing the current of the entire battery cell 1.

[0031] In some embodiments, reference Figure 2 , along the second direction, from the middle of the battery cell 1 to the edge of the battery cell 1, the width of the first bonding member 21 along the length direction of the fine grid 11 gradually increases; or, referring to Figure 1 and Figure 3 , along the second direction, from the middle of the battery cell 1 to the edge of the battery cell 1, the first bonding member 21 includes a first portion 211 and a second portion 212, the width of the first portion 211 is greater than the width of the second portion 212, the thickness of the first portion 211 is greater than the thickness of the second portion 212, and the first portion 211 and the second portion 212 are arranged alternately.

[0032] In the second direction, the direction from the middle of the battery cell 1 to the edge of the battery cell 1 can refer to Figures 1 to 3 The direction indicated by the arrow C in the figure. When the width of the first bonding member 21 along the length direction of the fine grid 11 gradually increases, the shape of the first bonding member 21 can be a trapezoid. The closer to the edge of the battery cell 1, the greater the swing and position error of the interconnection member 3, and the worse the fixing reliability of the interconnection member 3. In this embodiment, the width of the first bonding member 21 close to the edge of the battery cell 1 is larger, which can better ensure the welding reliability and current collection efficiency.

[0033] When the first part 211 and the second part 212 are arranged alternately, the width of the first part 211 may be 1 mm, and the width of the second part 212 may be 0.8 mm. The first part 211 and the second part 212 may have a smooth transition.

[0034] An insulating member 4 is arranged between the interconnection member 3 and the battery cell 1. The first part 211 is preferably located between the fine grid 11 and the interconnection member 3, and the second part 212 is preferably located between the insulating member 4 and the interconnection member 3. At this time, the contact area between the first bonding member 21 and the fine grid 11 is larger, which can more effectively connect the fine grid 11 and collect current, and at the same time reduce material loss.

[0035] In some embodiments, a connecting portion 12 is disposed on the fine grid 11, and an insulating member 4 and a connecting portion 12 are alternately disposed between the interconnection member 3 and the battery cell 1 along the second direction; the first portion 211 is located between the connecting portion 12 and the interconnection member 3; Figure 3 The width of the first portion 211 close to the edge of the battery cell 1 is greater than the width of the first portion 211 close to the middle of the battery cell 1 ; the second portion 212 is located between the insulating member 4 and the interconnecting member 3 .

[0036] Among them, the insulating member 4 can be an insulating glue. Along the first direction, the size of the insulating member 4 is greater than the width of the interconnection member 3. The size of the insulating member 4 along the first direction can be less than or equal to 3mm. The height of the insulating member 4 can be less than or equal to 20μm-30μm. Through the insulating member 4, insulation between the interconnection member 3 and the heterogeneous fine grid 11 on the battery cell 1 can be achieved. The shape of the insulating member 4 can be square, square with rounded corners, trapezoidal, waist-shaped, elliptical, etc. The closer to the edge of the battery cell 1, the greater the swing and position error of the interconnection member 3, and the worse the fixing reliability of the interconnection member 3. In this embodiment, the width of the first part 211 close to the edge of the battery cell 1 is larger, which can better ensure the welding reliability and current collection efficiency.

[0037] In some embodiments, reference Figure 4 and Figure 5 A connecting portion 12 is provided on the fine grid 11 , and the connecting portion 12 includes a first connecting portion 121 and a second connecting portion 122 . The area of ​​the first connecting portion 121 is greater than that of the second connecting portion 122 .

[0038] In some embodiments, a first connecting member 21 is located on the first connecting portion 121 .

[0039] In some embodiments, a first connecting member 21 is located on the second connecting portion 122 .

[0040] In some embodiments, a second connecting member 22 is located on the second connecting portion 122 .

[0041] The connection part 12 may be a welding pad, and the fine grid 11 is electrically connected to the connection part 12. The first bonding member 21 is electrically connected to the first connection part 121, the second connection part 122, or the first connection part 121 and the second connection part 122 at the same time, and the second bonding member 22 is electrically connected to the second connection part 122. The first connection part 121 may be located on the fine grid 11 closest to the edge of the battery cell 1. Alternatively, the first connection part 121 may be provided on multiple fine grids 11 near the edge of the battery cell 1. A first bonding member 21 preferably covers one to four second connection parts 122 near the first connection part 121.

[0042] In this embodiment, by providing the first connection part 121 and the second connection part 122 covered by the first bonding member 21, the connection stability between the first bonding member 21 and the battery cell 1 can be improved, so that the end of the interconnection member 3 can be further stabilized and the fixing reliability of the end of the interconnection member 3 can be improved. In actual production, the first bonding member 21 can be provided not only on the first connection part 121 with a larger edge, but also on the top of the smaller second connection part 122. While increasing the length of the first bonding member 21, the interconnection reliability at the second connection part 122 can be improved. When the first bonding member 21 is provided on the larger first connection part 121 and the second bonding member 22 is provided on the second connection part 122, the sizes of the bonding member and the connection part are more matched, which can improve the fixing reliability of the bonding member on the battery cell 1.

[0043] In addition, a first joining member 21 at least partially extends outside the first connection portion 121, a first joining member 21 at least partially extends outside the second connection portion 122, and a second joining member 22 at least partially extends outside the second connection portion 122, which can increase the contact area between the first joining member 21 and the second joining member 22 and the battery cell 1, and ensure the connection effect between the first joining member 21 and the second joining member 22 and the battery cell 1. In addition, when the first joining member 21 is printed, its edge portion is easily extended outside the battery cell 1. The provision of the first connection portion 121 can prevent the edge portion of the first joining member 21 from extending outside the battery cell 1.

[0044] In some embodiments, reference Figure 5 , the length of the first connection part 121 is greater than the length of the second connection part 122, and the width of the first connection part 121 is greater than the width of the second connection part 122. At this time, the length and width of the first connection part 121 are both greater than the length and width of the second connection part 122, which can facilitate the expansion of the first bonding member 21 disposed thereon in width and length, reduce the difficulty of forming the first bonding member 21, and reserve a larger process window for the interconnection member 3 in the first and second directions.

[0045] Among them, the length of the first connection part 121 and the second connection part 122 is also the size of the first connection part 121 and the second connection part 122 along the first direction. The width of the first connection part 121 and the second connection part 122 is also the size of the first connection part 121 and the second connection part 122 along the second direction. The length of the first connection part 121 can be 0.3-0.8 mm, for example, 0.5 mm, 0.8 mm, 0.3 mm. The width of the first connection part 121 can be greater than or equal to 0.2 mm and less than or equal to 0.5 mm. The width of the first connection part 121 of the positive electrode is greater than the width of the first connection part 121 of the negative electrode. The width of the first connection part 121 of the positive electrode can be 0.5 mm, and the width of the first connection part 121 of the negative electrode can be 0.2 mm. The length of the second connection part 122 can be 0.3 mm, and the width of the second connection part 122 can be 0.2 mm.

[0046] In some embodiments, the number of interconnectors 3 connected to a single battery cell 1 is a first number, the number of first connection portions 121 is the same as the first number, or the number of first connection portions 121 is twice the first number.

[0047] In some embodiments, reference Figure 5 The first connection portion 121 is disposed on the fine grid 11 closest to the edge of the battery cell 1 .

[0048] Among them, when the number of the first connection parts 121 is the same as the first number, the multiple first connection parts 121 can be located on one side edge of the battery cell 1 along the second direction. When the number of the first connection parts 121 is twice the first number, the multiple first connection parts 121 are located on both side edges of the battery cell 1 along the second direction. When the number of the first connection parts 121 is twice the first number, the reliability of fixing the interconnection part 3 to both ends of the battery cell 1 can be ensured. When the first connection part 121 is arranged on the fine grid 11 closest to the edge of the battery cell 1, compared with the first connection part 121 being arranged on multiple fine grids 11 close to the edge of the battery cell 1, it can reduce costs and ensure effective electrical connection of each outermost fine grid 11.

[0049] In some embodiments, reference Figures 1 to 4, a first joining member 21 and a battery cell 1 surround at least one insulating member 4 and are fixedly connected. Among them, the bonding force between the first joining member 21 and the insulating member 4 is greater than or equal to 8N. The top surface of the second joining member 22 away from the battery cell 1 is not lower than the top surface of the insulating member 4 away from the battery cell 1. A first joining member 21 and a battery cell 1 preferably surround at least one insulating member 4. That is, the bottom of the insulating member 4 is the battery cell 1, and the side and top are in contact with the first joining member 21, forming a surrounding state. It should be understood that the surrounding here does not require the first joining member 21 to cover the entire top and side of the insulating member 4. Along the second direction, a first joining member 21 covers at least one insulating member 4, which can achieve insulation between the interconnection member 3 and the heterogeneous fine grid 11 on the battery cell 1, and will not interrupt the first joining member 21. In addition, a first joining member 21 and a battery cell 1 surround at least one insulating member 4 and are fixedly connected, which can further improve the connection stability between the first joining member 21 and the battery cell 1.

[0050] In some embodiments, a first bonding member 21 and a battery cell 1 cover at least two connection portions 12 and are fixedly connected. The connection portion 12 is the gripping area of ​​the first bonding member 21 on the battery cell 1. In this case, the gripping area of ​​the first bonding member 21 on the battery cell 1 can be increased, thereby improving the connection stability.

[0051] In some embodiments, a second bonding member 22 contacts the side of an adjacent insulating member 4 and covers a connecting portion 12. In this case, the second bonding member 22 fills a large amount of space between adjacent insulating members 4, so that the interconnection member 3 and the connecting portion 12 can be reliably connected through sufficient second bonding members 22.

[0052] In some embodiments, along the first direction, part of the fine grid 11 is covered by the first bonding member 21 or the second bonding member 22. The covered length of the fine grid 11 is greater than or equal to 0.1 mm and less than or equal to 0.9 mm.

[0053] Among them, the covered length of the fine grid 11 can be 0.1mm, 0.3mm, 0.5mm, 0.6mm, 0.7mm, 0.9mm, etc. The covered length of the fine grid 11 is preferably greater than or equal to 0.5 mm and less than or equal to 0.7 mm. When the fine grid 11 is covered by the first bonding member 21, the fine grid 11 can be directly electrically connected to the first bonding member 21 while being conductive with the first bonding member 21 through the connecting portion 12, which can improve the current transmission efficiency of the fine grid 11 and the connection stability of the first bonding member 21. When the covering length is within the above range, the contact area between the first bonding member 21 and the fine grid 11 is large, which can increase the contact area between the first bonding member 21 and the battery cell 1, and ensure the connection stability between the first bonding member 21 and the battery cell 1.

[0054] In some embodiments, the first bonding member 21 and the second bonding member 22 are combined with the connecting portion 12 to form an intermetallic compound, and the first bonding member 21 and the second bonding member 22 are combined with the fine grid 11 to form an intermetallic compound. Intermetallic compounds are generated in the process of two metals diffusing with each other and forming an alloy reaction. Intermetallic compounds can improve the connection stability and conductivity between the bonding member electrodes. In this embodiment, the first bonding member 21 and the second bonding member 22 are combined with the connecting portion 12 and the fine grid 11 to form an intermetallic compound, which can further improve the connection stability of the first bonding member 21 and the second bonding member 22 with the battery cell 1, and the current transmission efficiency between the fine grid 11.

[0055] In some embodiments, the first bonding member 21 extends beyond the connection portion 12, and the second bonding member 22 extends beyond the connection portion 12. In this case, the first bonding member 21 and the second bonding member 22 are not only attached to the connection portion 12, but also extend to the fine grid 11 connected to the connection portion 12, which can improve the bonding performance of the first bonding member 21, the second bonding member 22 and the battery cell 1.

[0056] In some embodiments, the intermetallic compound includes a main body and an extension located on one side or both sides of the main body along the first direction, and the extension extends along the first direction. In this embodiment, the extension of the intermetallic compound extends along the first direction, which is conducive to increasing the size of the intermetallic compound and can further improve the connection stability between the first bonding member 21 and the second bonding member 22 and the battery cell 1. It should be understood that the main body here can be an intermetallic compound formed by the bonding member and the connecting portion 12, and the extension can be a metal compound formed by the bonding member and the fine grid 11.

[0057] In some embodiments, the surface of the battery cell 1 includes a non-electrode area and an electrode area where a fine grid 11 is provided, a portion of the first bonding member 21 is attached to the non-electrode area, and a portion of the second bonding member 22 is attached to the non-electrode area. Among them, the electrode area can be divided into a positive electrode area and a negative electrode area, the area covered by the fine grid 11 of the positive electrode is the positive electrode area, and the area covered by the fine grid 11 of the negative electrode is the negative electrode area. In this embodiment, the contact area between the first bonding member 21 and / or the second bonding member 22 and the battery cell 1 can be increased, thereby improving the connection stability between the first bonding member 21 and the second bonding member 22 and the battery cell 1.

[0058] In some embodiments, the height difference between the top surface of the first bonding member 21 away from the battery cell 1 and the top surface of the second bonding member 22 away from the battery cell 1 is less than or equal to 0.1 mm, ensuring the flatness of the top surface of the bonding layer 2 as a whole, thereby ensuring that the interconnection member 3 and the bonding layer 2 have good overall contact. The height of the first bonding member 21 can be 0.05-0.1 mm, and the height of the second bonding member 22 can be 0.05-0.1 mm.

[0059] In some embodiments, the resistivity of the first bonding member 21 and the second bonding member 22 is less than or equal to 0.18Ω·cm. The material of the first bonding member 21 and the second bonding member 22 includes tin with a mass percentage greater than or equal to 50%. The interconnection member 3 includes a substrate and a solder layer coated outside the substrate, and the first bonding member 21 and the second bonding member 22 are fused with the solder layer.

[0060] Among them, the material of the first bonding member 21 and the second bonding member 22 may also include bismuth, lead, etc. The material of the solder layer includes tin with a mass percentage greater than or equal to 50%. The low resistivity of the first bonding member 21 and the second bonding member 22 can ensure good current transmission performance. The main component of the first bonding member 21 and the second bonding member 22 is tin, which can improve the connectivity and the bonding with the interconnection member 3, so as to facilitate the connection between the electrode and the interconnection member 3. The electrode here includes a fine grid 11 and a connecting portion 12.

[0061] In some embodiments, an insulating member 4 is provided between the interconnection member 3 and the battery cell 1; along the first direction, the size of the first bonding member 21 is greater than 0.5 times the size of the interconnection member 3 and smaller than the size of the insulating member 4. The size of the first bonding member 21 along the first direction may be 0.55 times, 0.6 times, 0.7 times, or 0.8 times the size of the interconnection member 3 along the first direction. When the size of the first bonding member 21 along the first direction is within the above range, it can ensure a good fixing effect on the interconnection member 3, and the insulating member 4 can better insulate the interconnection member 3 from the heterogeneous fine grid.

[0062] In some embodiments, reference Figure 6 , along the second direction, the first bonding members 21 are provided at both end edges of the battery cell 1. The two ends and the middle of an interconnection member 3 are fixed to the two battery cells 1 by four first bonding members 21. In this embodiment, for an interconnection member 3, there is a larger fixing force and a smaller force on the interconnection member 3. The first bonding members 21 are provided at the ends and the middle of the interconnection member 3, so that the first bonding members 21 providing a larger fixing force can be distributed at the two ends and the middle of the interconnection member 3. This part is a weak point of connection, so that the overall fixing reliability of the interconnection member 3 can be improved.

[0063] In some embodiments, along the second direction, the distance between the first joining member 21 and the edge of the adjacent battery cell 1 is less than or equal to the distance between the end of the interconnection member 3 and the edge of the adjacent battery cell 1. In this embodiment, the end of the interconnection member 3 does not extend out of the first joining member 21, which can improve the fixing reliability of the end of the interconnection member 3 and reduce the hidden cracks of the battery cell 1 caused by the collision between the end of the interconnection member 3 and the edge of the battery cell 1.

[0064] In some embodiments, the height of the fine grid 11 is greater than or equal to 10 micrometers and less than or equal to 20 micrometers. The fine grid 11 and the connecting portion 12 provided on the fine grid 11 are printed integrally, and the height difference between the connecting portion 12 and the fine grid 11 is less than or equal to 1 micrometer.

[0065] The height of the fine grid 11 can be 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, etc. The height of the connecting portion 12 is greater than or equal to 10 microns and less than or equal to 20 microns. The printing process of the fine grid 11 and the connecting portion 12 can be screen printing.

[0066] The main material of the fine grid 11 is copper, and when the fine grid 11 is printed first and then the connecting portion 12 is printed, copper is easily oxidized in a high temperature environment. If a high-temperature copper paste is used to print the fine grid 11, an oxide layer will be formed on the surface of the fine grid 11 after printing. If a low-temperature copper paste is used to print the fine grid 11, the interface contact between the fine grid 11 and the connecting portion 12 will be poor. In this embodiment, the fine grid 11 and the connecting portion 12 are printed integrally, which can reduce the number of processes. In addition, the integral printing can avoid the contact interface between the fine grid 11 and the connecting portion 12, thereby avoiding the interface resistance between the fine grid 11 and the connecting portion 12.

[0067] In some embodiments, the material of the fine grid 11 is the same as the material of the connecting portion 12 disposed on the fine grid 11. The fine grid 11 is preferably printed integrally with the connecting portion 12 and is made of the same material. The material of the fine grid 11 is the same as the material of the connecting portion 12, which can avoid interface resistance between different materials.

[0068] In some embodiments, the width of the positive electrode fine grid 11 is greater than the width of the negative electrode fine grid 11. The width of the positive electrode fine grid 11 may be 40 μm, and the width of the negative electrode fine grid 11 may be 30 μm.

[0069] The fine grids 11 on the battery cells are all continuous fine grids. In this case, compared with interrupted fine grids, continuous fine grids have better current collection effect.

[0070] The material of the fine grid 11 and the material of the connecting portion 12 include at least one of copper, silver, aluminum, and nickel. The material of the fine grid 11 and the material of the connecting portion 12 preferably include copper. When the material of the connecting portion 12 includes copper, it can play a role in grasping the bonding layer 2 compared to the connecting portion 12 including silver.

[0071] In some embodiments, the conductivity of the interconnection 3 is greater than the conductivity of the fine grid 11, and the conductivity of the fine grid 11 is greater than the conductivity of the bonding layer 2; and / or the melting point of the bonding layer 2 is greater than the melting points of the fine grid 11 and the interconnection 3. Among them, the resistivity of the interconnection 3 is less than the resistivity of the fine grid 11, and the resistivity of the fine grid 11 is less than the resistivity of the bonding layer 2. The interconnection 3 and the fine grid 11 are the main transmission paths of the current, and the conductivity of the interconnection 3 and the fine grid 11 is relatively large, which can effectively reduce the resistance loss in the current transmission path.

[0072] An embodiment of the present application further provides a photovoltaic system, which includes a photovoltaic component according to any one of the above embodiments or a combination of multiple embodiments.

[0073] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0074] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A photovoltaic module, characterized in that: It includes a battery sheet, an interconnection member, and a bonding layer, wherein the battery sheet has a plurality of fine grids extending along a first direction and arranged at intervals along a second direction; The interconnection member and the battery cell are fixed and electrically connected via the bonding layer, and the bonding layer includes a first bonding member and a second bonding member; The first bonding member connects the interconnection member and at least two of the fine grids near the edge of the battery cell; A second bonding member connects the interconnection member and the single fine gate.

2. The photovoltaic module according to claim 1, characterized in that: Along the second direction, the first joining member intersects with at least two of the fine grids.

3. The photovoltaic module according to claim 1, characterized in that: The number of fine grids electrically connected to the first bonding member is 3 to 5.

4. The photovoltaic module according to claim 1, characterized in that: Along the second direction, from the middle of the battery cell to the edge of the battery cell, the width of the first bonding member along the length direction of the fine grid gradually increases; Alternatively, along the second direction, from the middle of the battery cell to the edge of the battery cell, the first bonding member includes a first part and a second part, the width of the first part is greater than the width of the second part, the thickness of the first part is greater than the thickness of the second part, and the first part and the second part are arranged alternately.

5. The photovoltaic module according to claim 4, characterized in that: A connecting portion is provided on the fine grid, and insulating members and the connecting portion are alternately provided between the interconnection member and the battery sheet along the second direction; The first portion is located between the connecting portion and the interconnecting member; the width of the first portion close to the edge of the battery cell is greater than the width of the first portion close to the middle of the battery cell; The second portion is located between the insulating member and the interconnecting member.

6. The photovoltaic module according to claim 1, characterized in that: The fine grid is provided with a connecting portion, the connecting portion includes a first connecting portion and a second connecting portion, and the area of ​​the first connecting portion is larger than the area of ​​the second connecting portion; The first engaging member is located on the first connecting portion; and / or, the first engaging member is located on the second connecting portion; And / or, a second engaging member is located on the second connecting portion.

7. The photovoltaic module according to claim 1, characterized in that: A connecting portion is disposed on the fine grid, and the connecting portion includes a first connecting portion and a second connecting portion. The length of the first connecting portion is greater than the length of the second connecting portion, and the width of the first connecting portion is greater than the width of the second connecting portion.

8. The photovoltaic module according to claim 1, characterized in that: The fine grid is provided with a connecting portion, the connecting portion includes a first connecting portion and a second connecting portion, and the area of ​​the first connecting portion is larger than the area of ​​the second connecting portion; The number of interconnecting members connected with a single battery sheet is a first number, the number of the first connecting parts is the same as the first number, or the number of the first connecting parts is twice the first number; And / or, the first connection portion is arranged on a fine grid closest to an edge of the battery cell.

9. The photovoltaic module according to claim 1, characterized in that: Insulating members and connecting parts are alternately arranged between the interconnecting member and the battery cell along the second direction; the first joining member and the battery cell surround at least one of the insulating members and are fixedly connected; And / or, the first joining member and the battery cell cover at least two of the connecting portions and are fixedly connected; And / or, a second joining member contacts a side surface of an adjacent insulating member and covers one of the connecting portions.

10. The photovoltaic module according to claim 1, characterized in that: Along the first direction, part of the fine grid is covered by the first bonding member or the second bonding member.

11. The photovoltaic module according to claim 1, characterized in that: A connecting portion is provided on the fine grid; The first bonding member and the second bonding member are combined with the connection portion to form an intermetallic compound, and the first bonding member and the second bonding member are combined with the fine grid to form an intermetallic compound; And / or, the first engaging member and / or the second engaging member extends beyond the connecting portion.

12. The photovoltaic module according to claim 11, characterized in that: The intermetallic compound includes a main body and an extending portion located on one side or both sides of the main body along a first direction, and the extending portion extends along the first direction.

13. The photovoltaic module according to claim 1, characterized in that: The surface of the battery cell includes a non-electrode area and an electrode area where the fine grid is disposed, and a portion of the first bonding member and / or a portion of the second bonding member is attached to the non-electrode area.

14. The photovoltaic module according to claim 1, characterized in that: A height difference between a top surface of the first bonding member away from the battery cell and a top surface of the second bonding member away from the battery cell is less than or equal to 0.1 mm.

15. The photovoltaic module according to claim 1, characterized in that: The interconnection member includes a substrate and a solder layer coated outside the substrate, and the first bonding member and the second bonding member are fused with the solder layer; The resistivity of the first bonding member and the second bonding member is less than or equal to 0.18Ω·cm; and / or the material of the first bonding member and the second bonding member includes tin with a mass percentage greater than or equal to 50%.

16. The photovoltaic module according to claim 1, characterized in that: An insulating member is provided between the interconnection member and the battery cell; Along the first direction, a size of the first joining element is larger than 0.5 times a size of the interconnecting element and smaller than a size of the insulating element.

17. The photovoltaic module according to any one of claims 1 to 16, characterized in that: Along the second direction, both end edges of the battery sheet are provided with the first joining members; And / or, both ends and a middle portion of an interconnection member are fixed to two battery cells via four of the first bonding members.

18. The photovoltaic module according to any one of claims 1 to 16, characterized in that: Along the second direction, a distance between the first joining member and an edge of the adjacent battery cell is less than or equal to a distance between an end of the interconnecting member and an edge of the adjacent battery cell.

19. The photovoltaic module according to any one of claims 1 to 16, characterized in that: The height of the fine grid is greater than or equal to 10 microns and less than or equal to 20 microns; And / or, the fine grid and a connecting portion provided on the fine grid are printed integrally, and a height difference between the connecting portion and the fine grid is less than or equal to 2 micrometers; and / or, the width of the fine grid of the positive electrode is greater than the width of the fine grid of the negative electrode; And / or, the fine grids on the battery cells are all continuous fine grids.

20. The photovoltaic module according to any one of claims 1 to 16, characterized in that: The material of the fine grid is the same as the material of the connecting portion provided on the fine grid; And / or, the material of the fine grid and the material of the connecting portion include at least one of copper, silver, aluminum, and nickel.

21. A photovoltaic system, characterized in that: A photovoltaic module comprising any one of claims 1 to 20.

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