Photovoltaic module

Abstract

The utility model is applicable to the technical field of photovoltaic cells, and provides a photovoltaic assembly, which comprises a back plate and bus bars, the back plate is provided with an extending hole for the bus bars to extend out, two bus bars are respectively arranged along two radial sides of the extending hole, and the two bus bars are arranged in parallel in a staggered manner. The two adjacent bus bars are arranged in parallel in a staggered manner, the free ends of the two bus bars extend out of the extending holes, and the extending bus bars face two opposite directions, so that the two bus bars do not contact with each other along the respective extending directions. When lamination is carried out, the bending angle at the bending position is small, the strain difference between the inner side and the outer side is small, the bending surface is smooth, a top protrusion cannot be formed towards the direction of the battery piece, and the battery piece is prevented from being cracked.

Description

Technical Field

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

[0002] In a photovoltaic module, bus bars are set on the cells to connect the welding strips on each cell, which can effectively collect current from each cell / string for output to the junction box or the main cable of the solar panel.

[0003] During the manufacturing process, in order to avoid short circuits caused by contact between two adjacent busbars, the busbars are usually bent 180° in the opposite direction to the outside of the backplane. The busbars are thin-walled metal parts. During the lamination process, the metal material on the inside of the busbar is compressed, while the metal material on the outside is stretched. Due to the large strain difference between the inside and the outside, stress concentration is easily generated on the curved surface of the bend. This stress concentration will cause the material to form an outward bulge at the bend, which bulges toward the battery cell and causes the battery cell to crack during the lamination process. Utility Model Content

[0004] The utility model provides a photovoltaic assembly, aiming to solve the problem that when a bus bar is bent, a bulge protruding toward a battery sheet is formed at the bending position, which may cause the battery sheet to crack during the lamination process.

[0005] The utility model is implemented in this way. A photovoltaic component includes a back plate and a bus bar. The back plate is provided with an extension hole for allowing the bus bar to extend out. A bus bar is arranged on each radial side of the extension hole. The two bus bars are arranged in an alternating and parallel manner.

[0006] In one embodiment, the extension hole includes two oppositely disposed side walls, and the projections of the side walls on the bus bar are perpendicular to the bus bar.

[0007] In one embodiment, the extension hole is a square hole.

[0008] In one embodiment, a side of the extension hole close to the bus bar is rounded or chamfered.

[0009] In one embodiment, a side of the extension hole away from the bus bar is rounded or chamfered.

[0010] In one embodiment, the photovoltaic assembly further comprises a junction box, a diode is arranged in the junction box, and the distance between the two parallel bus bars is adapted to the width of the welding points at both ends of the diode.

[0011] In one embodiment, the length of the portion of the bus bar extending out of the extension hole is adapted to the installation distance of the diode.

[0012] The beneficial effect achieved by the utility model is that, since two adjacent busbars are arranged in parallel and staggered, the free ends of the two busbars extend from the extension holes, and the extended busbars face two opposite directions, so the two busbars will not contact each other along their respective extension directions. When laminating, the bending angle at the bend is small, the strain difference between the inner side and the outer side is small, the bending surface is smooth, and no convexity is formed in the direction of the battery cell, thereby avoiding the battery cell from being cracked. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of a photovoltaic module provided by the prior art;

[0014] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a photovoltaic module provided by the prior art;

[0015] Figure 3 It is a schematic diagram of the structure of the photovoltaic assembly provided by the utility model;

[0016] Figure 4 It is a schematic diagram of a partial cross-sectional structure of a photovoltaic module provided by the utility model;

[0017] Figure 5 It is a schematic diagram of the deformation of the busbar in the photovoltaic module provided by the prior art.

[0018] Description of reference numerals:

[0019] 100, photovoltaic module; 101, back sheet; 1011, extension hole; 102, bus bar;

[0020] 200, battery cell;

[0021] 300. Soldering strip. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0023] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0028] The utility model has two adjacent busbars arranged in parallel and staggered, and the free ends of the two busbars extend from the extension holes, and the extended busbars face two opposite directions, and the two busbars do not contact each other along their respective extension directions. When laminating, the bending angle of the bending part is small, the strain difference between the inner side and the outer side is small, the bending surface is smooth, and no convexity is formed in the direction of the battery cell, thereby avoiding the battery cell from cracking.

[0029] Embodiment 1

[0030] This embodiment provides a photovoltaic module 100, including a back plate 101 and a bus bar 102. The back plate 101 is provided with an extension hole 1011 for allowing the bus bar 102 to extend out. A bus bar 102 is arranged on each radial side of the extension hole 1011, and the two bus bars 102 are arranged in parallel and staggered.

[0031] Figure 1 and Figure 2 As shown, busbars 102 are usually arranged on the same line, and adjacent busbars 102 can end and intersect, and busbars 102 need to transmit the collected current to the outside. If adjacent busbars 102 are connected, a short circuit will occur, so that the collected current cannot be transmitted to the outside. To avoid this situation, the free end of the busbar 102 must be bent 180° to the outside of the back plate 101 after extending out of the back plate 101, so that the free ends of adjacent busbars 102 cannot touch each other.

[0032] like Figure 5 As shown, the bent busbar 102 is subjected to pressure during the lamination process. Due to the large strain difference between the inner and outer sides, stress concentration is easily generated on the bent arc surface, which in turn causes the material to form an outward bulge at the bend, bulging toward the battery cell 200, causing the battery cell 200 to crack.

[0033] like Figure 3 and Figure 4As shown, in this embodiment, two adjacent bus bars 102 are arranged in parallel and staggered. After the free ends of the two bus bars 102 extend out of the back plate 101 through the same extension hole 1011, there is no need to perform 180° reverse bending. The two bus bars 102 will not contact each other along their respective extension directions.

[0034] The busbar 102 is bent once when it extends out of the extension hole 1011, and it is bent a second time when it continues to extend horizontally after extending out of the extension hole 1011. The two bends are staggered. During the lamination process, it is subjected to pressure, but at the location where the bend occurs, the bending angle is small and does not exceed 90°. The metal material on the inside of the busbar 102 is less compressed, and the metal material on the outside is also less stretched. The strain difference between the inside and the outside is small, and it is not easy to generate stress concentration on the curved surface of the bend, and thus the material will not form an outward bulge at the bend. The bending surface is smooth and will not form a top bulge in the direction of the battery cell 200, thereby avoiding the battery cell 200 from cracking.

[0035] It can be understood that the welding ribbon 300 connects the electrodes of the battery cell 200 and is usually made of metal materials with good conductivity such as copper, aluminum, tin-lead alloy silver, etc. The welding ribbon 300 is located on the positive and negative electrodes of the battery cell 200 and is responsible for drawing electrons from the battery cell to form an electric current. The bus bar 102 is a conductive line that brings together the current of a battery string formed by a single battery cell 200 or multiple battery cells 200. The bus bar 102 connects multiple welding ribbons 300 to collect the current collected by the welding ribbons 300. When the setting position of the bus bar 102 changes, the connection position of the welding ribbon 300 connected to the bus bar 102 is adaptively adjusted.

[0036] In this embodiment, two adjacent busbars 102 are arranged in parallel and staggered, and the free ends of the two busbars 102 extend from the extension holes 1011. The extended busbars 102 face opposite directions, and the two busbars 102 do not contact each other along their respective extension directions. During lamination, the bending angle of the bend is small, the strain difference between the inner and outer sides is small, the bending surface is smooth, and no convexity is formed toward the battery cell 200, thereby avoiding the battery cell 200 from being split.

[0037] Embodiment 2

[0038] On the basis of the first embodiment, the extension hole 1011 includes two oppositely disposed side walls, and the projections of the side walls on the bus bar 102 are perpendicular to the bus bar 102 .

[0039] The vertical side wall projection helps to accurately align the busbar 102, ensure the accurate position of the busbar 102 in the component, and better ensure the consistency of the bending of the two busbars 102, thereby improving the assembly quality of the component.

[0040] In one embodiment, the extension hole 1011 is a square hole. Compared with holes of other shapes, square holes are easier to process and manufacture, which can reduce production costs and processing complexity. During the installation process, square holes are also easier to align and fix the busbar 102.

[0041] Embodiment 3

[0042] Based on the first embodiment, a side of the extension hole 1011 close to the bus bar 102 is rounded or chamfered.

[0043] When the busbar 102 is bent for the first time and extends out of the extension hole 1011, the edge of the extension hole 1011 close to the busbar 102 may come into contact with the first bending position of the busbar 102. When the busbar 102 moves or adjusts in the extension hole 1011, the sharp edge may cause scratches and wear on the surface of the busbar 102. The setting of rounding or chamfering can effectively reduce friction, protect the surface integrity of the busbar 102, and extend its service life.

[0044] Embodiment 4

[0045] On the basis of the first or third embodiment, a side of the extension hole 1011 away from the bus bar 102 is rounded or chamfered.

[0046] After the busbar 102 extends out of the extension hole 1011, it is bent for the second time, and the edge of the extension hole 1011 away from the busbar 102 may come into contact with the second bending position of the busbar 102. When the busbar 102 moves or adjusts in the extension hole 1011, the sharp edge may cause scratches and wear on the surface of the busbar 102. The setting of rounding or chamfering can effectively reduce friction, protect the surface integrity of the busbar 102, and extend its service life.

[0047] Embodiment 5

[0048] On the basis of the first embodiment, the photovoltaic assembly 100 further includes a junction box, in which a diode is arranged, and the distance between two parallel bus bars 102 is adapted to the width of the welding points at both ends of the diode.

[0049] The junction box is an important part of the photovoltaic module 100, mainly used to protect the electrical connection points from the external environment (such as moisture, dust and mechanical damage). It provides a safe and reliable electrical connection platform for the photovoltaic module 100. The diode is set in the junction box, mainly to prevent the reverse current from damaging the photovoltaic module 100 and to ensure that the current output by each component is not wasted, thereby improving the efficiency and power generation of the entire photovoltaic system.

[0050] One pin of the diode is connected to a bus bar 102, and the other pin is connected to another bus bar 102. In this way, under normal working conditions, current is transmitted through the bus bar 102; when reverse current occurs, the diode can play a blocking role. The spacing of the bus bars 102 and the width of the welding points at both ends of the diode must be matched, so as to ensure that the pins of the diode can be accurately welded to the bus bar 102 and ensure the reliability of the electrical connection.

[0051] In one embodiment, the length of the portion of the bus bar 102 extending from the extension hole 1011 is adapted to the installation distance of the diode. The portion of the bus bar 102 extending from the extension hole 1011 is used to connect the diode, and the length of the portion is adapted to the installation distance of the diode, that is, the portion of the bus bar 102 extending from the extension hole 1011 does not need to be bent to just connect the diode, avoiding the bent portion touching to cause a short circuit, and further shortening the path length of current transmission.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: It comprises a back plate and a bus bar. The back plate is provided with a protruding hole for allowing the bus bar to protrude. A bus bar is respectively arranged on both sides of the protruding hole in a radial direction. The two bus bars are arranged in a staggered and parallel manner.

2. The photovoltaic module according to claim 1, characterized in that: The extension hole includes two oppositely arranged side walls, and the projections of the side walls on the bus bar are perpendicular to the bus bar.

3. The photovoltaic module according to claim 2, characterized in that: The extending hole is a square hole.

4. The photovoltaic module according to claim 1, characterized in that: A side of the protruding hole close to the bus bar is rounded or chamfered.

5. The photovoltaic module according to claim 1 or 4, characterized in that: A side of the extension hole away from the bus bar is rounded or chamfered.

6. The photovoltaic module according to claim 1, characterized in that: It also includes a junction box, in which a diode is arranged, and the distance between two parallel bus bars is adapted to the width of the welding points at both ends of the diode.

7. The photovoltaic module according to claim 6, characterized in that: The length of the portion of the bus bar extending out of the extending hole is adapted to the installation distance of the diode.

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