Solar cell string and photovoltaic module

Abstract

The utility model discloses a solar cell string and a photovoltaic assembly, which are applied to the technical field of solar cells and comprise cells and solder strips. The welding strip is arranged on the surface of the battery piece, and the welding strip is provided with a first surface deviating from the grid line and a second surface located outside the first surface; the welding strip is provided with a hollow part, and the hollow part is provided with a first opening located in the first surface and a second opening located in the second surface. An overflow space is formed between the second opening and the surface of the battery piece; the hollowed-out part is filled with fixing glue, the fixing glue comprises a filling part located in the hollowed-out part and an overflow part overflowing from the second opening to the overflow space to be solidified, and the filling part and the overflow part are of an integrated structure. The hollow part is arranged in the welding strip to accommodate the fixing glue, so that the hidden crack risk of the battery piece caused by the protruding fixing glue formed after glue dispensing can be avoided. And the second opening is formed, so that the overflow part and the filling part which are of an integrated structure can be formed during dispensing, and the fixing firmness of the welding strip is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell technical field especially relates to a solar cell string and a photovoltaic module. BACKGROUND

[0002] With the iteration of photovoltaic module technology and the trend of cost reduction and efficiency improvement, photovoltaic busbar-free technology is more and more widely used in photovoltaic products. This technology cancels the main grid line and pad (PAD) point on the cell sheet, reduces the grid line shading, and improves the power generation power; at the same time, it reduces the cell sheet silver paste unit consumption and the cost of single watt. However, the existing dispensing 0BB (busbar-free) technical route is: dispensing glue first, then welding solder strip, or welding solder strip first, then dispensing glue. Among them, the way of dispensing glue first and then welding solder strip cannot fully cover the solder strip with fixed glue, which leads to unstable connection; although the way of welding solder strip first and then dispensing glue can ensure that the fixed glue fully covers the solder strip, the glue points on the solder strip will form a series of small peaks, so that the cell sheet receives more pressure at the glue dispensing position when subjected to external pressure, and the risk of cell sheet cracking is higher.

[0003] Therefore, how to provide a solar cell string that can ensure the firmness of the connection after dispensing glue and avoid the protrusion of the fixed glue is a problem that technicians in the field urgently need to solve. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a solar cell string that can ensure the firmness of the adhesion between the fixed glue and the solder strip and avoid the protrusion of the fixed glue; another purpose of the utility model is to provide a photovoltaic module that can ensure the firmness of the adhesion between the fixed glue and the solder strip and avoid the protrusion of the fixed glue.

[0005] To solve the above technical problems, the utility model provides a solar cell string, which comprises a cell sheet and a solder strip.

[0006] The solder strip is arranged on the surface of the cell sheet, the solder strip has a first surface facing away from the cell sheet and a second surface located outside the first surface, the solder strip is provided with a hollow part, the hollow part has a first opening located on the first surface and a second opening located on the second surface, and the second opening and the surface of the cell sheet have an overflow space.

[0007] The hollow part is filled with fixed glue, the fixed glue comprises a filling part located in the hollow part and an overflow part overflowed from the second opening to the overflow space and solidified, and the filling part and the overflow part are integrated.

[0008] Optionally, the second opening is arranged towards the cell sheet.

[0009] Optionally, the surface of the solder strip towards the side of the battery piece comprises a curved section, and the second opening is arranged on the curved section.

[0010] Optionally, the solder strip is a circular solder strip.

[0011] Optionally, the top surface of the filling part is flush with the first opening.

[0012] Optionally, a support part is arranged in the hollow part, the support part is fixedly connected with the solder strip, and the fixing glue covers the surface of the support part in the hollow part.

[0013] Optionally, the hollow part comprises at least one main path and at least two branch paths, the main path extends from the first opening to the inside of the solder strip, and the branch paths extend from the main path to the second surface to form at least two second openings.

[0014] Optionally, in the short axis direction of the solder strip, a plurality of second openings are arranged symmetrically based on the long axis of the solder strip.

[0015] Optionally, the solder strip is provided with a plurality of hollow parts, and the plurality of hollow parts are arranged along the axis of the long axis of the solder strip.

[0016] The utility model also provides a photovoltaic module, comprising the solar cell string of any one of the above.

[0017] The utility model provides a solar cell string, comprising battery piece and solder strip, solder strip sets up at the surface of battery piece, solder strip has the first surface away from battery piece, and the second surface is located in the first surface, solder strip is provided with hollow part, and hollow part has the first opening in the first surface and the second opening in the second surface, and the second opening has the overflow space with the surface of battery piece, and the fixed glue is filled in the hollow part, and the fixed glue comprises the filling part in the hollow part and the overflow part that solidifies from the overflow of the second opening to the overflow space, and the filling part and the overflow part are integrated structure.

[0018] The overflow part and the filling part of the integrated structure can be formed when dispensing by arranging the hollow part in the solder strip to accommodate the fixed glue, the overflow part is in full contact with the battery piece, the filling part is closely connected with the solder strip inside the hollow part, and the firmness of the solder strip is ensured.

[0019] The utility model also provides a photovoltaic module, and also has the beneficial effect, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A top view structural schematic diagram of a welding strip in a solar cell string provided by the embodiment of the present application;

[0022] Figure 2 A specific structural schematic diagram of a solar cell string provided by the embodiment of the present application.

[0023] In the figure: 1. cell piece, 2. grid line, 3. welding strip, 4. hollow part, 5. filling part, 6. overflow part. DETAILED DESCRIPTION

[0024] The core of the present application is to provide a solar cell string. In the prior art, the 0BB technical route is: first, glue is applied, then welding strip is welded, or first, welding strip is welded, then glue is applied. The fixed glue of the first glue application and then welding strip welding mode cannot fully cover the welding strip, resulting in insecure connection; although the first welding strip and then glue application can ensure that the fixed glue fully covers the welding strip, the scheme causes the glue points to cover on the welding strip to form a number of small mountains, so that when the cell piece is subjected to external pressure, the pressure received by the glue application position is greater, and the risk of cell piece hidden cracking is higher.

[0025] And a solar cell string provided by the present application, comprising a cell piece and a welding strip; the welding strip is arranged on the surface of the cell piece, and the welding strip has a first surface away from the cell piece and a second surface located outside the first surface; the welding strip is provided with a hollow part, and the hollow part has a first opening located on the first surface and a second opening located on the second surface; the second opening and the surface of the cell piece have an overflow space; the hollow part is filled with fixed glue, and the fixed glue comprises a filling part located in the hollow part and an overflow part overflowed from the second opening to the overflow space and solidified, and the filling part and the overflow part are integrated structures.

[0026] The setting of the hollow part in the welding strip to accommodate the fixed glue can avoid the risk of cell piece hidden cracking caused by the protruding fixed glue after glue application. The setting of the second opening enables the overflow part and the filling part to form an integrated structure when glue is applied, wherein the overflow part is in full contact with the cell piece, and the filling part is tightly connected with the welding strip inside the hollow part, thereby ensuring the firmness of the welding strip.

[0027] In order to make the person skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Embodiment one

[0029] Please refer to Figure 1 And Figure 2 , Figure 1 is a top view structural schematic diagram of a solder strip in a solar cell string provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a specific solar cell string provided by an embodiment of the present application.

[0030] See Figure 1 And Figure 2 In the embodiment of the present application, the solar cell string comprises a cell sheet 1 and a solder strip 3; the solder strip 3 is arranged on the surface of the cell sheet 1, the solder strip 3 has a first surface facing away from the cell sheet 1, and a second surface located outside the first surface; the solder strip 3 is provided with a hollow part 4, the hollow part 4 has a first opening located on the first surface, and a second opening located on the second surface; the second opening and the surface of the cell sheet 1 have an overflow space; the hollow part 4 is filled with fixing glue, the fixing glue comprises a filling part 5 located in the hollow part 4 and an overflow part 6 overflowed from the second opening to the overflow space and solidified, and the filling part 5 and the overflow part 6 are integrated structures.

[0031] The specific structure of the cell sheet 1 can refer to the prior art, which will not be described here again. In the present embodiment, the surface of the cell sheet 1 has at least a sub-grid. In the present embodiment, the solder strip 3 is arranged on the surface of the cell sheet 1 and fixedly connected with the surface of the cell sheet 1. Since the solder strip 3 is arranged on the surface of the cell sheet 1, in the present embodiment, the solder strip 3 has a surface directly contacting the cell sheet 1 and a surface not directly contacting the cell sheet 1, wherein the surface of the solder strip 3 directly contacting the cell sheet 1 is equivalent to being covered and shielded by the cell sheet 1, and the surface of the solder strip 3 not directly contacting the cell sheet 1 is a surface of the solder strip 3 which is not directly covered and shielded by the cell sheet 1. In the present embodiment, the solder strip 3 has a first surface facing away from the cell sheet 1, and a second surface located outside the first surface, and the second surface needs to have an area not covered by the cell sheet 1. Taking a rectangular solder strip 3 as an example, generally, its bottom surface is the surface of the solder strip 3 directly contacting the cell sheet 1, its top surface is the first surface of the solder strip 3 facing away from the cell sheet 1, and its side surface is the above-mentioned second surface.

[0032] In the present embodiment, the solder strip 3 is provided with a hollow part 4, which has a first opening on the first surface and a second opening on the second surface. In the present embodiment, the second opening is usually located in the area of the second surface that is not covered by the battery sheet 1, so that an overflow space is formed between the second opening and the surface of the battery sheet 1, and the overflow part 6 formed by the fixing glue is arranged in the overflow space and fixedly connected with the surface of the battery sheet.

[0033] In the present embodiment, the solder strip 3 is fixedly connected with the grid line 2 by dispensing glue in the hollow part 4. The first opening of the solder strip 3 is usually the glue injection port, and the second opening is usually the glue overflow port. Since the solder strip 3 is in a strip shape, in order to ensure that the solder strip 3 can be firmly connected with the battery sheet 1 everywhere, the solder strip 3 is usually provided with a plurality of hollow parts 4, and the plurality of hollow parts 4 are arranged along the axis of the long axis of the solder strip 3 to ensure that the solder strip 3 is fixedly connected with the battery sheet 1 everywhere.

[0034] In the present embodiment, the hollow part 4 is filled with fixing glue. Since the first opening is used for glue injection and the second opening is used for glue overflow, the fixing glue is usually injected into the hollow part 4 from the first opening by the dispensing process, and part of the fixing glue will overflow from the second opening. The fixing glue is in a flowing state after the dispensing process starts, and is in a solid state after solidification. Due to the arrangement of the second opening, part of the fixing glue will overflow from the second opening to the battery sheet 1 after the dispensing process starts, and the overflow part 6 is formed after the overflowed part solidifies. The filling part 5 is formed after the fixing glue in the hollow part 4 solidifies. Therefore, the filling part 5 and the overflow part 6 are both structures formed after the fixing glue solidifies, and are integrated structures. The filling part 5 is located in the hollow part 4, and the overflow part 6 usually fills the overflow space between the solder strip 3 and the battery sheet 1, that is, the overflow part 6 can cover the surface of the battery sheet 1 and wrap the bottom of the solder strip 3. The overflow part 6 connects the battery sheet 1 and the filling part 5 from the second opening, so that the solder strip 3 and the battery sheet 1 can be connected by the fixing glue, and the fixing glue is at least partially hidden in the hollow part 4 to avoid forming a mountain-shaped protrusion.

[0035] Further, in order to facilitate the formation of the overflow part, the second opening is generally arranged towards the cell sheet 1 in the present embodiment. In order to facilitate the formation of the structure, the surface of the solder strip 3 towards the side of the cell sheet 1 in the present embodiment comprises an arc surface section, which can have a surface arranged towards the cell sheet 1 but not in direct contact with the cell sheet 1, i.e. a gap is left between the cell sheet 1 and the solder strip 3 as the overflow space. The second opening is arranged on the arc surface section at this time, thereby forming the second opening pointing towards the cell sheet 1. Specifically, the solder strip 3 in the present embodiment can be a circular solder strip 3 to have the arc surface section. Of course, other structures of the solder strip 3 can also be used in the present embodiment, such as a solder strip 3 with a rectangular cross section with rounded corners, and the second opening can be arranged at the rounded corner at this time, etc., which is not specifically limited herein.

[0036] Specifically, the top surface of the filling part 5 can be flush with the first opening in the present embodiment. At this time, the fixing glue fills the entire hollow part 4, thereby achieving the largest possible increase in the contact area between the fixing glue and the solder strip 3 and ensuring the firm connection between the fixing glue and the solder strip 3.

[0037] Further, a support part is arranged in the hollow part 4 in the present embodiment, the support part is fixedly connected with the solder strip 3, and the surface of the support part in the hollow part 4 is covered by the fixing glue. The support part is arranged in the hollow part 4 and needs to be fixedly connected with the solder strip 3. Therefore, the fixing glue can be in contact with the surface of the support part in addition to the inner wall of the hollow part 4, thereby increasing the contact area between the fixing glue and the solder strip 3 and further ensuring the firm connection between the fixing glue and the solder strip 3. The specific number of support parts in one hollow part 4 is not specifically limited in the present embodiment and is determined according to the specific circumstances. The setting of the support part can increase the contact area between the unit glue and the solder strip 3 and reduce the amount and cost of the solder strip 3 and the glue.

[0038] Specifically, the hollow part 4 in the present embodiment comprises at least one main path and at least two branch paths, the main path extends from the first opening to the inside of the solder strip 3, and the branch paths extend from the main path to the second surface to form at least two second openings. The structure between the two branch paths can be the support part. In the dispensing process, the fixing glue is injected into the hollow part 4 of the solder strip 3 along the main path from the first opening, the fixing glue is in contact with the surface of the support part between the branch paths before solidification to form the overflow part 6 on the surface of the cell sheet 1, and the fixing glue is also fixedly connected with the support part.

[0039] In order to ensure that the solder strip 3 is stressed uniformly under the action of the fixing glue in the embodiment, a plurality of second openings can be arranged symmetrically based on the long axis of the solder strip 3 in the short axis direction of the solder strip 3. Taking an example of one hollow part 4 having two branches, the two branches can be arranged symmetrically left and right based on the long axis of the solder strip 3 to ensure that the stresses on the left and right sides of the solder strip 3 are uniform. When more branches are arranged, the plurality of branches can be divided into two groups each arranged symmetrically left and right based on the long axis of the solder strip 3, and the specific structure can be set according to actual conditions, which is not limited here.

[0040] The fixing glue used in the embodiment can be light-curing glue or heat-curing glue, and the process of curing the fixing glue can include irradiation with ultraviolet rays or heating for curing, which is not limited here. In the embodiment, the solder strip 3 is first welded on the surface of the battery piece 1, and then the fixing glue is applied at the hollow position of the solder strip 3 to form the above structure.

[0041] It should be noted that when the battery piece 1 has a main grid, the solder strip 3 is usually arranged along the main grid, so the overflow part 6 is fixedly connected to the grid line 2 as the main grid. When the battery piece 1 is a battery piece without a main grid and only has a secondary grid, the solder strip 3 is usually arranged along the direction perpendicular to the secondary grid. At this time, the overflow part 6 can be fixedly connected to the grid line 2 as the secondary grid, forming a structure as shown in Figure 2 The overflow part 6 can also be arranged between adjacent secondary grids, and the structure formed at this time can be compared with Figure 2 The overflow part 6 can be fixedly connected to the surface of the battery piece 1 which is not covered by the grid line 2.

[0042] The solar cell string provided by the embodiment of the utility model can avoid the risk of hidden cracking of the battery piece 1 caused by the protruding fixing glue after dispensing by arranging the hollow part 4 in the solder strip 3 to accommodate the fixing glue. The second opening is arranged to form an integrated overflow part 6 and a filling part 5 during dispensing, wherein the overflow part 6 is in full contact with the battery piece, and the filling part 5 is tightly connected with the solder strip 3 inside the hollow part 4 to ensure the firmness of the solder strip 3.

[0043] Embodiment two

[0044] The utility model further provides a photovoltaic module, and the photovoltaic module specifically comprises the solar cell string provided in any of the above embodiments.

[0045] The solar cell string provided by the embodiment can ensure the firmness of the fixed adhesive and the solder strip 3, and can avoid the risk of hidden cracks caused by the protrusion of the fixed adhesive, so that the photovoltaic module provided by the embodiment can have a higher yield rate.

[0046] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments.

[0047] Finally, it should be noted that in this document, relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0048] The solar cell string and the photovoltaic module provided by the embodiment are described in detail above. The principle and implementation mode of the embodiment are described by applying specific examples in this document, and the description of the above embodiments is only used to help understand the method and core idea of the embodiment. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the embodiment without departing from the principle of the embodiment, and these improvements and modifications also fall within the protection scope of the claims of the embodiment.

Claims

1. A solar cell string, characterized by, The battery piece and the solder strip are included. The solder strip is arranged on the surface of the battery piece, and has a first surface facing away from the battery piece and a second surface outside the first surface; the solder strip is provided with a hollow part, the hollow part has a first opening on the first surface and a second opening on the second surface; the second opening and the surface of the battery piece have an overflow space therebetween; The hollow part is filled with fixing glue, the fixing glue includes a filling part in the hollow part and an overflow part overflowed from the second opening to the overflow space and solidified, and the filling part and the overflow part are integrated.

2. The solar cell string according to claim 1, characterized in that, The second opening is arranged towards the battery piece.

3. The solar cell string of claim 2, wherein, The surface of the solder strip towards the battery piece side includes an arc segment, and the second opening is arranged on the arc segment.

4. The solar cell string of claim 3, wherein, The solder strip is a circular solder strip.

5. The solar cell string of claim 1, wherein, The top surface of the filling part is flush with the first opening.

6. The solar cell string according to any one of claims 1 to 5, characterized in that, The hollow part is provided with a support part, the support part is fixedly connected with the solder strip, and the fixing glue covers the surface of the support part in the hollow part.

7. The solar cell string of claim 6, wherein, The hollow part includes at least one main path and at least two branch paths, the main path extends from the first opening to the inside of the solder strip, and the branch paths extend from the main path to the second surface to form at least two second openings.

8. The solar cell string of claim 7, wherein, In the short axis direction of the solder strip, a plurality of second openings are arranged symmetrically based on the long axis of the solder strip.

9. The solar cell string of claim 1, wherein, The solder strip is provided with a plurality of hollow parts, and the plurality of hollow parts are arranged along the axis of the long axis of the solder strip.

10. A photovoltaic module, characterized by, The solar cell string includes the solar cell string as claimed in any one of claims 1 to 9.

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