CN219832674U

CN219832674U - Photovoltaic module

Info

Publication number: CN219832674U
Application number: CN202321006022.XU
Authority: CN
Inventors: 赵志浩; 夏正月; 申海平
Original assignee: Tongwei Solar Chengdu Co Ltd
Current assignee: Tongwei Solar Chengdu Co Ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-10-13
Anticipated expiration: 2033-04-27

Abstract

The present disclosure provides a photovoltaic assembly including a support plate, a bus bar, and a plurality of cell strings; the battery string comprises a welding strip and a plurality of battery pieces, and the battery pieces are connected through the welding strip; be provided with a plurality of spacing grooves in the backup pad, a plurality of spacing grooves set up side by side, and a plurality of battery strings correspond to set up in a plurality of spacing grooves, have the passageway that converges between the adjacent spacing groove, and the passageway that converges communicates adjacent spacing groove, and the busbar wears to locate in the passageway that converges, and the busbar electricity is connected in the welding strip. The whole position of the battery string is limited by the limiting groove, so that the offset possibly generated in the packaging process of the battery string can be effectively reduced, the problem of parallel sheets between adjacent battery strings is avoided, and the light leakage phenomenon is eliminated.

Description

Photovoltaic module

Technical Field

The utility model relates to the technical field of solar cells, in particular to a photovoltaic module.

Background

A silicon solar cell is a device based on silicon materials that converts solar energy into electrical energy using the photovoltaic effect. The solar cell is one of the most common and mature solar cells at present, has the advantages of high efficiency, long service life, good stability, environmental protection and the like, and has been widely applied to the fields of photovoltaic power stations, solar street lamps, solar chargers and the like.

The solar cell is a core component for realizing the power generation function. In a practical production process, it is often necessary to package a plurality of battery pieces together to form a larger battery assembly, also called a photovoltaic assembly. In the preparation of photovoltaic modules, the front glass, front film, battery sheet, back film and back sheet are typically packaged as a whole by lamination processes using thermoplastic adhesive films. During lamination, the film material may shrink and flow to some extent, which may cause the cell to shift, thereby affecting the production yield.

Disclosure of Invention

Based on this, in order to reduce the amount of offset of the cell strings or to avoid the cell strings from being offset, it is necessary to provide a photovoltaic module.

According to some embodiments of the present disclosure, there is provided a photovoltaic module including a support plate, a bus bar, and a plurality of cell strings;

the battery string comprises a welding strip and a plurality of battery pieces, and the battery pieces are connected through the welding strip;

be provided with a plurality of spacing grooves in the backup pad, a plurality of the spacing groove sets up side by side, a plurality of battery cluster corresponds to be set up in a plurality of in the spacing groove, adjacent have the confluence passageway between the spacing groove, the confluence passageway intercommunication is adjacent the spacing groove, the busbar wears to locate in the confluence passageway, just the busbar electricity connect in the welding strip.

In some embodiments of the present disclosure, a partition wall is provided between adjacent limit grooves, and the bottom end of the battery sheet is lower than the top end of the partition wall.

In some embodiments of the present disclosure, a height difference between the bottom end of the battery piece and the top end of the partition wall is 0.05mm to 0.15mm.

In some embodiments of the disclosure, the busway includes an inner busway, the inner busway extends through the partition wall, the inner busway extends through the inner busway.

In some embodiments of the disclosure, the busway further comprises an edge busway, the edge busway is disposed between the partition wall and the end walls at both ends of the limiting groove, and the edge busway is disposed in the edge busway.

In some embodiments of the present disclosure, the ratio of the width of the bus channel to the width of the bus bar is (2-10): 1.

In some embodiments of the present disclosure, the bus bar is welded to the weld strip.

In some embodiments of the present disclosure, the support plate is a glass support plate.

In some embodiments of the present disclosure, a front film is further included, the front film being disposed between the battery string and the support plate.

In some embodiments of the present disclosure, the battery pack further comprises a back film disposed on a side of the battery string away from the support plate, and a back plate disposed on a side of the back film away from the battery string.

In the conventional art, in order to avoid the battery plate from being offset, it is possible to attempt to fix the battery strings in such a manner that a positioning tape is provided between the battery strings. However, on the one hand, the additionally introduced positioning tape requires additional working procedures, and on the other hand, the positioning tape has limited fixing effect on the battery strings and can affect the long-term use of the photovoltaic module. Therefore, this method has a limited effect of solving the above-described problems.

In the photovoltaic module provided by the disclosure, a plurality of limiting grooves are formed in a supporting plate, a plurality of battery pieces are connected into a battery string, and the battery string is arranged in the limiting grooves. The whole position of the battery string is limited by the limiting groove, so that the offset possibly generated in the packaging process of the battery string can be effectively reduced, the problem of parallel sheets between adjacent battery strings is avoided, and the light leakage phenomenon is eliminated. Further, the photovoltaic module is skillfully provided with the bus channel for accommodating the bus bar between the limit grooves by means of the limit grooves, so that the setting stability of the bus bar can be improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of a photovoltaic module in the extending direction of a cell string;

fig. 2 is a schematic cross-sectional structure of the photovoltaic module in a direction perpendicular to the extending direction;

fig. 3 is a schematic structural view of a support plate in the photovoltaic module;

fig. 4 is a schematic cross-sectional structure of the support plate in the extending direction of the battery string;

fig. 5 is a schematic cross-sectional structure of the support plate in a direction perpendicular to the extending direction;

wherein, each reference sign and meaning are as follows:

100. a support plate; 101. a limit groove; 110. a partition wall; 111. an inner converging channel; 112. an edge converging channel; 120. an outer peripheral wall; 210. a battery sheet; 220. welding a belt; 310. an inner bus bar; 320. an edge bus bar; 400. a front membrane; 500. a back film; 600. a back plate.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the embodiments that are illustrated in the appended drawings. The examples illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In addition, in the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct, indirect via an intermediate medium, or communication between two elements. It will be appreciated that those skilled in the art can, depending on the particular circumstances, correspondingly understand the specific meaning of the terms described above without ambiguity.

Unless otherwise defined, in the description of the present utility model, terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientation or positional relationship based on the orientation or positional relationship shown in the drawings of the present utility model, which are merely for convenience and simplicity of description of the utility model, while helping the reader understand in conjunction with the drawings, and do not limit or imply that the specific orientation of the device or element referred to must be present, and thus do not limit the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. "multiple" in this context includes a combination of two or more items.

One embodiment of the present disclosure provides a photovoltaic module including a support plate, a bus bar, and a plurality of cell strings, wherein the cell strings include a solder strip and a plurality of battery pieces to which the solder strip is electrically connected;

be provided with a plurality of spacing grooves in the backup pad, a plurality of spacing grooves set up side by side, and a plurality of battery strings correspond to set up in a plurality of spacing grooves, have the passageway that converges between the adjacent spacing groove, and the passageway that converges communicates adjacent spacing groove, and the busbar wears to locate in the passageway that converges, and the busbar electricity is connected in the welding strip.

In the photovoltaic module provided by the disclosure, a plurality of limiting grooves are formed in a supporting plate, a plurality of battery pieces are connected into a battery string, and the battery string is arranged in the limiting grooves. The whole position of the battery string is limited by the limiting groove, so that the offset possibly generated in the packaging process of the battery string can be effectively reduced, the problem of parallel sheets between adjacent battery strings is avoided, and the light leakage phenomenon is eliminated. Further, the photovoltaic module skillfully sets a bus channel for accommodating the bus bar between the limit grooves by means of the set limit grooves, and improves the setting stability of the bus bar.

Fig. 1 of the present disclosure shows a schematic cross-sectional structure of a photovoltaic module in a direction in which a battery string extends, and fig. 2 shows a schematic cross-sectional structure of the photovoltaic module in a direction perpendicular to the direction in which the photovoltaic module extends. As shown in connection with fig. 1 and 2, the photovoltaic module includes a support plate 100, a bus bar, and a cell string. The battery string includes a solder strip 220 and a plurality of battery cells 210. The bus bars include an inner bus bar 310 and an edge bus bar 320.

Fig. 3 of the present disclosure shows a schematic structural view of the support plate 100 therein, fig. 4 shows a schematic sectional structure of the support plate 100 in the extending direction of the battery string, and fig. 5 shows a schematic sectional structure of the support plate 100 in a direction perpendicular to the extending direction. Referring to fig. 3 to 5, a plurality of limiting grooves 101 are provided in a support plate 100, the plurality of limiting grooves 101 are arranged side by side, and a converging channel is provided between adjacent limiting grooves 101, and communicates with adjacent limiting grooves 101. In combination with the structures shown in fig. 1 to 5, the plurality of battery strings are correspondingly arranged in the plurality of limiting grooves 101, and the bus bars penetrate through the bus channel. In addition, the bus bar is electrically connected to the solder strip 220.

It will be appreciated that the battery string is formed by a plurality of battery cells 210 connected by a solder strip 220, and thus, the battery string has an elongated shape. The limiting groove 101 is also elongated in shape corresponding to the shape of the battery string. Both the limiting groove 101 and the battery string have opposite ends in the direction of extension thereof, which are referred to herein as "head end" and "tail end" for convenience of description, respectively, but it is understood that the head end and the tail end are merely for convenience of description and do not represent a specific orientation on the limiting groove 101 or the battery string.

Referring to fig. 3, in some examples of the present disclosure, adjacent spacing grooves 101 have a partition wall 110 therebetween. Referring to fig. 1 and 2, the bottom ends of the battery cells 210 are lower than the top ends of the partition walls 110. Wherein, the partition wall 110 is introduced between the adjacent limiting grooves 101, and the bottom end of the battery plate 210 is lower than the top end of the partition wall 110, so that the partition wall 110 can play a role of spacing adjacent battery strings, further reducing the offset of the battery strings and avoiding the problem of parallel placement of the battery strings.

Referring to fig. 3, in the present embodiment, there may be three or more limiting grooves 101, and correspondingly, there may be a plurality of partition walls 110. Further, a plurality of partition walls 110 may be disposed in parallel.

In this embodiment, there may be a plurality of bus bars, and correspondingly, there may be a plurality of bus channels.

In some examples of this embodiment, as shown in fig. 1-5, the bus bar includes an inner bus bar 111, the bus bar includes an inner bus bar 310, a partition wall 110 is provided between adjacent limit grooves 101, the inner bus bar 111 penetrates through the partition wall 110, and the inner bus bar 310 penetrates through the inner bus bar 111. The inner bus duct 111 penetrating the partition wall 110 is provided, so that the influence on the inner bus bar 310 can be reduced as much as possible while the partition wall 110 is introduced, and the original design of the inner bus bar 310 can be maintained.

In some examples of this embodiment, as shown in fig. 1-5, the bus bar further includes an edge bus bar 112, the bus bar further includes an edge bus bar 320, the edge bus bar 112 is disposed between the partition wall 110 and the end walls of the two ends of the limiting slot 101, and the edge bus bar 320 is disposed through the edge bus bar 112.

The edge bus duct 112 may be disposed only between the end wall of the front end or the rear end of the limiting slot 101 and the partition wall 110, and the edge bus bar 320 is also connected only to the front end or the rear end of the battery string. The edge bus duct 112 may be disposed between the partition 110 and the end wall at the head end and between the partition 110 and the end wall at the tail end, and two edge bus bars 320 are connected to the head end and the tail end of the battery string. In this embodiment, the edge blending channel 112 is disposed between the partition wall 110 and the end wall of the head end and between the partition wall 110 and the end wall of the tail end. The edge bus bar 320 is arranged between the partition wall 110 and the end wall, so that the influence on the edge bus bar 320 can be reduced as much as possible while the partition wall 110 is introduced, and the original design mode of the edge bus bar 320 is maintained.

In this embodiment, the edge bus bar 320 may be used to connect a plurality of battery strings in series, and the inner bus bar 310 may be used to connect a plurality of battery strings in parallel. At this time, the current through the inner bus bar 310 may be large. In some examples of this embodiment, the width of the inner buss channel 111 may be greater than the width of the edge buss channel 112 to facilitate the provision of a thicker inner buss bar 310.

In some examples of this embodiment, the ratio of the width of the bus bar channel to the width of the bus bar is (2-10): 1. Since the bus bars are generally thin, their width may be only about 10mm, providing a significantly wider bus channel facilitates more accurate threading of the bus bars into the bus channel.

In some examples of this embodiment, the ratio of the width of the bus bar channel to the width of the bus bar may also be (3-8): 1. For example, the ratio of the width of the bus channel to the width of the bus bar may be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1. In addition, the ratio of the width of the bus duct to the width of the bus bar may be between any two of the above-mentioned ratios.

In some examples of this embodiment, the width of the inner confluence channel 111 may be 40mm to 100mm.

In some examples of this embodiment, the width of the edge blending channel 112 may be 20mm to 50mm.

It will be appreciated that in this photovoltaic module, the bus bar is threaded into the bus bar channel, but the bus bar needs to be connected to the solder strip 220, so the bus bar also has a portion located in the limit groove 101. In the battery string, adjacent battery cells 210 may have a certain interval therebetween, and the inner bus bars 310 may be disposed between the adjacent battery cells 210. In addition, a certain interval may be provided between the battery cell 210 located at the outermost end of the battery string and the end wall of the limiting groove 101, and the edge bus bar 320 may be disposed between the battery cell 210 and the end wall of the limiting groove 101.

In some examples of this embodiment, both the inner bus bar 310 and the edge bus bar 320 may be welded to the solder strip 220. The inner bus bar 310 and the edge bus bar 320 can be more tightly coupled with the bonding tape 220 by welding the inner bus bar 310 and the edge bus bar 320 to the bonding tape 220.

Referring to fig. 3, the support plate 100 has an outer circumferential wall 120, and a plurality of limiting grooves 101 are all located in an inner region of the outer circumferential wall 120. It will be appreciated that the partition wall 110 is also located in the inner region of the outer peripheral wall 120, and that the partition wall 110 is spaced apart from the plurality of limit grooves 101 in the outer peripheral wall 120.

In some examples of this embodiment, the support plate 100 is a glass support plate. The glass has good light transmittance and high hardness, and can limit the displacement of the battery plate 210 while ensuring light transmittance.

Referring to fig. 1, in some examples of this embodiment, the photovoltaic module further includes a front film 400. The front film 400 is disposed between the battery string and the support plate 100. It is understood that the front film 400 serves to space the battery string from the support plate 100 and to protect the battery cells 210. Since the battery string is disposed in the limiting groove 101 on the support plate 100, at least part of the front film 400 is also disposed in the limiting groove 101 on the support plate 100. In order to ensure the continuity of the front film 400, the front film 400 also covers the partition wall 110.

In some examples of this embodiment, the front film 400 may be a polymeric film. The material of the polymer film may include polymer materials such as ethylene-vinyl acetate copolymer and polyolefin elastomer, and the front film 400 should have good light transmission performance and a certain elasticity to minimize light loss and avoid damage to the battery cell 210.

In some examples of this embodiment, the difference in height between the bottom ends of the battery cells 210 and the top ends of the partition walls 110 is 0.05mm to 0.15mm. In general, the thickness of the battery plate 210 is between 0.1mm and 0.3mm, and the height difference between the bottom end of the battery plate 210 and the top end of the partition wall 110 is controlled to be more than 0.05mm, so that the position of the battery plate 210 can be well limited by the partition wall 110, and the offset of the battery plate 210 can be reduced. Controlling the height difference between the bottom end of the battery cell 210 and the top end of the partition wall 110 below 0.15mm can reduce the deformation amount of the front film 400 at the partition wall 110 and ensure the quality of the front film 400.

In a specific photovoltaic module, since the front film 400 also has a certain thickness, the height of the partition walls 110 can be designed in combination with the thickness of the front film 400 used. For example, the thickness of the front film 400 is 0.4mm, and the height of the partition wall 110 may be set to 0.5mm.

In some examples of this embodiment, the ratio of the groove width of the limiting groove 101 to the width of the battery plate 210 may be (1.001-1.03): 1. Further, the slot width of the limiting slot 101 may be slightly wider than the width of the battery plate 210 to preserve a certain design redundancy. For example, the ratio of the groove width of the limiting groove 101 to the width of the battery piece 210 may be (1.001 to 1.03): 1. Further, the ratio of the groove width of the limiting groove 101 to the width of the battery plate 210 may be (1.001 to 1.01): 1.

In some examples of this embodiment, the groove width of the limiting groove 101 may be designed to be equal to the sum of the width of the battery sheet 210 and the thickness of the two front films 400, for example, the width of the battery string is 182mm, and the thickness of one front film 400 is 0.4mm, and then the groove width of the limiting groove 101 may be designed to be 182.8mm. In the actual lamination preparation process, the front film 400 is filled between the battery string and the side wall of the limiting groove 101, and can be stably fixed in the limiting groove 101, so that the battery string is prevented from being deviated.

In some examples of this embodiment, the photovoltaic module may further include a backsheet 500 and a backsheet 600. The back film 500 is disposed at a side of the battery string away from the support plate 100, and the back plate 600 is disposed at a side of the back film 500 away from the battery string. Wherein, the back film 500 covers one side of the battery string away from the support plate 100 for planarizing the surface of the battery string while protecting the battery string, so that the back plate 600 is conveniently disposed.

In some examples of this embodiment, the back film 500 may also be a polymeric film. The material of the polymer film may include polymer materials such as ethylene-vinyl acetate copolymer and polyolefin elastomer, and the back film 500 should have good thermoplasticity and proper thickness to better protect the battery sheet 210 and form a flat surface when laminated.

In some examples of this embodiment, the backplate 600 may be a glass backplate.

In the photovoltaic module of the above embodiment, the supporting plate 100 is provided with a plurality of limiting grooves 101, and the plurality of battery pieces 210 are connected into a battery string, and then the battery string is disposed in the limiting grooves 101. The whole position of the battery string is limited by the limiting groove 101, so that the offset possibly generated in the packaging process of the battery string can be effectively reduced, the problem of parallel sheets between adjacent battery strings is avoided, and the light leakage phenomenon is eliminated. Further, the photovoltaic module skillfully sets a bus channel for accommodating the bus bar between the limit grooves 101 by means of the set limit grooves 101, so that the setting stability of the bus bar is improved.

In addition, the photovoltaic module actually makes only proper changes to the structure of the current support plate 100, and solves the problem of the deflection of the battery plate 210 in the conventional technology by providing the limiting groove 101 and the confluence channel in the support plate 100. The photovoltaic module basically does not need to change other original components or introduce additional components, basically does not need to change the existing production process, basically does not generate additional cost, and has higher applicability.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A photovoltaic module comprising a support plate, a bus bar, and a plurality of cell strings;

2. The photovoltaic module of claim 1, wherein a partition wall is provided between adjacent limit grooves, and the bottom end of the cell is lower than the top end of the partition wall.

3. The photovoltaic module of claim 2, wherein a height difference between the bottom end of the cell sheet and the top end of the partition wall is 0.05mm to 0.15mm.

4. The photovoltaic assembly of claim 2, wherein the buss channels comprise inner buss channels, the buss bars comprising inner buss bars, the inner buss channels extending through the spacer walls, the inner buss bars extending through the inner buss channels.

5. The photovoltaic module of claim 2, wherein the buss bar further comprises an edge buss bar disposed between the spacer wall and the end walls at both ends of the limiting groove, the edge buss bar passing through the edge buss bar.

6. The photovoltaic module according to any one of claims 1 to 5, wherein a ratio of the width of the bus bar channel to the width of the bus bar is (2 to 10): 1; and/or the number of the groups of groups,

the ratio of the groove width of the limit groove to the width of the battery piece is (1.001-1.03): 1.

7. The photovoltaic module of any of claims 1-5, wherein the bus bar is welded to the solder strip.

8. The photovoltaic module of any of claims 1-5, wherein the support plate is a glass support plate.

9. The photovoltaic module of any of claims 1-5, further comprising a front film disposed between the cell string and the support plate.

10. The photovoltaic module of any of claims 1-5, further comprising a back film disposed on a side of the cell string remote from the support plate and a back sheet disposed on a side of the back film remote from the cell string.