CN212303689U - Battery string structure and photovoltaic module - Google Patents
Battery string structure and photovoltaic module Download PDFInfo
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- CN212303689U CN212303689U CN202021422324.1U CN202021422324U CN212303689U CN 212303689 U CN212303689 U CN 212303689U CN 202021422324 U CN202021422324 U CN 202021422324U CN 212303689 U CN212303689 U CN 212303689U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The embodiment of the utility model provides a battery cluster structure and photovoltaic module, battery cluster structure includes: the battery pack comprises at least two battery strings which are sequentially arranged along a first direction, each battery string comprises a plurality of battery pieces which are sequentially connected in series along a second direction, the first direction is different from the second direction, adjacent battery strings are provided with overlapping areas which extend along the second direction, and each battery piece also comprises a non-overlapping area which is connected with the overlapping areas; and at least one battery piece in the same overlapping region in the adjacent battery strings has a thickness smaller than that of the non-overlapping region. The embodiment of the utility model provides a difference through reducing overlap area gross thickness and non-overlap area thickness improves photovoltaic module's yield.
Description
Technical Field
The embodiment of the utility model provides a relate to solar cell technical field, in particular to battery string structure and photovoltaic module.
Background
With the obvious problems of energy shortage, global temperature rise, increasingly worsened environment and the like, solar energy is receiving more and more attention as a green renewable energy source. A photovoltaic module is a device that converts renewable solar energy into electrical energy.
The module efficiency is an important index for measuring the performance of the photovoltaic module, and directly reflects the utilization efficiency of the photovoltaic module to the light energy. Particularly, the high assembly efficiency is not only beneficial to reducing the cost in the manufacturing process of the photovoltaic assembly, but also beneficial to reducing the occupied area required by the power station in the operation stage; in addition, the higher the module efficiency, the lower the size of the photovoltaic module and the lower the weight of the corresponding photovoltaic module, given the same module power of the photovoltaic module.
However, the yield of the photovoltaic module is reduced while the module efficiency of the photovoltaic module is improved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem who solves the problem that the photovoltaic module yield is low for providing a battery string structure and photovoltaic module.
In order to solve the above problem, an embodiment of the utility model provides a battery string structure is suitable for to constitute photovoltaic module, a serial communication port, the battery string structure includes: at least two battery strings that arrange in proper order along first direction, each the battery string includes a plurality of battery pieces that concatenate in proper order along the second direction, the first direction with the second direction is different, and is adjacent the battery string has the edge the overlap area that the second direction extends, each the battery piece still include with the non-overlap area that the overlap area is connected. And in the adjacent battery strings, the thickness of at least one battery piece in the same overlapping region is smaller than that of the non-overlapping region.
In addition, in two adjacent battery strings, in the first direction, at least one battery piece comprises a first surface, a step surface located in the overlapping area and a second surface located in the non-overlapping area, and the first surface is opposite to the step surface and the second surface; in the overlapping area, the step surface of one battery piece is opposite to the step surface of the other battery piece.
In addition, in the adjacent battery strings, the thicknesses of the two battery pieces in the same overlapping region are both smaller than the thickness of the battery piece in the non-overlapping region.
In addition, in the same battery string along the second direction, the thickness of the battery piece in one overlapping region is smaller than that of the battery piece in the non-overlapping region, and the thickness of the battery piece in the adjacent overlapping region is equal to that of the battery piece in the non-overlapping region; or in one battery string, the thicknesses of the battery pieces in the overlapping regions are all equal to the thicknesses of the battery pieces in the non-overlapping regions, and in the adjacent battery strings, the thicknesses of the battery pieces in the overlapping regions are all smaller than the thicknesses of the battery pieces in the non-overlapping regions.
In addition, the battery string structure further includes: at least one insulating layer, the insulating layer is located between adjacent battery pieces in the overlapping region.
In addition, the battery piece is of a single-layer structure with steps in the overlapping area; alternatively, the battery piece at least comprises a first layer structure and a second layer structure which are stacked, the first layer structure is positioned in the overlapping region and the non-overlapping region, and the second layer structure is positioned in the non-overlapping region.
In addition, in the adjacent battery strings, at least one battery piece satisfies: the thickness of the battery piece in the overlapping area is 1/4-3/4 of the thickness of the battery piece in the non-overlapping area.
In addition, the battery string structure further includes: and the overlapping junction area is formed by overlapping adjacent battery strings in the first direction and the second direction, and at least one battery piece positioned in the overlapping junction area has a notch.
Correspondingly, the embodiment of the utility model provides a still provide a photovoltaic module, include: the battery string structure and the packaging adhesive film for packaging the battery string structure.
In addition, the packaging adhesive film includes: the adhesive film comprises an adhesive film body and a plurality of adhesive film bulges positioned on the adhesive film body, wherein the positions of the adhesive film bulges are opposite to the positions of the overlapping areas.
Compared with the prior art, the embodiment of the utility model provides a technical scheme has following advantage:
the embodiment of the utility model provides a novel battery cluster structure is suitable for to constitute photovoltaic module, and the battery cluster structure includes: the battery piece comprises at least two battery strings which are sequentially arranged along a first direction, wherein adjacent battery strings are provided with overlapping regions which extend along a second direction, and the battery piece also comprises non-overlapping regions which are connected with the overlapping regions; the thickness of at least one battery piece positioned in the overlapping area is smaller than that of the battery piece positioned in the non-overlapping area. In the lamination stage of manufacturing the photovoltaic module by adopting the cell string structure, the thickness of at least one cell in the overlapping area is smaller than that of the cell in the non-overlapping area, so that the difference between the total thickness of the overlapping area and the thickness of the non-overlapping area is favorably reduced, the lamination pressure borne by the overlapping area can be buffered, the stress concentration of the overlapping area is reduced or eliminated, the risks of hidden cracking and breaking of the overlapping area are reduced, the yield of the photovoltaic module is favorably improved, and the performance of the photovoltaic module is improved.
In addition, the battery string structure further includes: and the overlapping junction area is formed by overlapping the adjacent battery strings in the first direction and the second direction, and at least one battery piece positioned in the overlapping junction area is provided with a notch. In the process that the cell strings and the cell strings are sequentially arranged, the total thickness of the cell pieces in the overlapping junction area can be reduced by the cell pieces with the unfilled corners, and the difference between the total thickness of the overlapping junction area and the thickness of the cell pieces in the non-overlapping region is reduced, so that the stress concentration degree of the overlapping junction area is further reduced in the laminating stage of manufacturing the photovoltaic module, the risk of hidden cracking or breakage of the overlapping junction area is further reduced, and the yield of the photovoltaic module is further improved.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, and the drawings are not to scale.
Fig. 1 is a schematic top view of a battery string structure according to a first embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a battery string structure according to a first embodiment of the present invention;
fig. 3 is a schematic top view of a battery string structure with a unfilled corner according to a first embodiment of the present invention;
fig. 4 is an enlarged schematic view of a cross-sectional structure of a part 13 of a battery string structure according to a first embodiment of the present invention;
fig. 5 is a schematic top view of a battery string structure according to a second embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a battery string structure according to a second embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a battery string structure according to a second embodiment of the present invention;
fig. 8 is a schematic top view of a battery string structure according to a third embodiment of the present invention;
fig. 9 is a schematic cross-sectional view of a battery string structure according to a third embodiment of the present invention;
fig. 10 is a schematic view of a photovoltaic module according to a fourth embodiment of the present invention, illustrating a disassembled sectional structure;
fig. 11 is a schematic view of a photovoltaic module according to a fourth embodiment of the present invention, illustrating a disassembled structure of another cross-sectional structure;
fig. 12 to 15 are schematic structural views of a packaging adhesive film in a photovoltaic module according to a fourth embodiment of the present invention.
Detailed Description
As can be seen from the background art, the prior art has a problem that the yield of the photovoltaic module is low while the module efficiency of the photovoltaic module is improved.
In order to improve the assembly efficiency of the photovoltaic assembly, adjacent battery strings are partially overlapped, and the battery strings are electrically insulated from each other by adopting an insulating material so as to eliminate the string spacing. That is, cell strings in the photovoltaic module are sequentially arranged along a certain direction, each cell string is formed by sequentially connecting a plurality of cell sheets in series along another certain direction, an overlapping region is formed between adjacent cell strings, each cell sheet further has a non-overlapping region connected with the overlapping region, the total thickness of the overlapping region is greater than the thickness of the non-overlapping region, and specifically, the total thickness of the overlapping region is 2 times the thickness of the non-overlapping region. In the lamination stage of manufacturing the photovoltaic module, the overlapping area has a large stress concentration, which can cause the overlapping area to be hidden or broken, so that the yield of the photovoltaic module is low.
In order to solve the above problem, the embodiment of the utility model provides a battery string structure, the thickness of the at least one battery piece of same overlap region is less than the thickness of non-overlap region in the adjacent battery string, can reduce the difference of the battery piece thickness of overlap region gross thickness and non-overlap region to reduce the stress concentration degree of overlap region, reduce the risk of latent splitting or rupture of slices, thereby improve photovoltaic module's yield.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the embodiments of the present invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 is a schematic top view of a battery string structure according to a first embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of the structure of FIG. 1 taken along the direction AA1 and along the direction BB1, wherein the direction AA1 is parallel to the direction BB 1; FIG. 3 is a schematic diagram of a top view of a battery string structure with unfilled corners; fig. 4 is an enlarged schematic cross-sectional view of a portion 13 of the battery string structure shown in fig. 2.
Referring to fig. 1 to 4 in combination, in the present embodiment, the cell string structure is suitable for forming a photovoltaic module, and the cell string structure includes: at least two cell strings sequentially arranged along a first direction, wherein adjacent cell strings are provided with an overlapping region 14 extending along a second direction, and the cell sheet 11 further comprises a non-overlapping region 15 connected with the overlapping region 14; the thickness of at least one cell piece 11 located in the overlapping region 14 is smaller than the thickness of the cell piece 11 located in the non-overlapping region 15.
The following will explain the structure of the battery string provided in the present embodiment in detail with reference to the accompanying drawings.
In this embodiment, the battery sheet 11 may be a single-sided battery or a double-sided battery; the first direction may be perpendicular to the second direction, the first direction being perpendicular to the AA1 direction, and the second direction being parallel to the AA1 direction. In other embodiments, the included angle between the first direction and the second direction may also be an acute angle.
In the present embodiment, as shown in fig. 2, in the same cell string along the second direction, the thickness of the cell piece 11 of one overlapping region 14 is smaller than that of the cell piece 11 of the non-overlapping region 15, and the thickness of the cell piece 11 of the adjacent overlapping region 14 is equal to that of the cell piece 11 of the non-overlapping region 15.
Specifically, the upper diagram in fig. 2 is a schematic cross-sectional structure along the direction of AA1, the lower diagram in fig. 2 is a schematic cross-sectional structure along the direction of BB1, and fig. 2 illustrates 4 battery strings, which are respectively defined as a first battery string, a second battery string, a third battery string and a fourth battery string from left to right.
As shown in fig. 2, in the first cell string, the thickness of one cell piece 11 in the overlapping region 14 is smaller than that in the non-overlapping region 15, and the thickness of the other cell piece 11 in the overlapping region 13 is equal to that in the non-overlapping region 15; correspondingly, in the second battery string, the thickness of one battery piece in the overlapping region 14 is equal to that in the non-overlapping region 15, and the thickness of the other battery piece 11 in the overlapping region 14 is smaller than that in the non-overlapping region 15; by analogy, two cells 11 in the same overlap region 14 are ensured to satisfy: the thickness of one cell 11 in the overlapping region 14 is less than the thickness in the non-overlapping region 15, and the thickness of the other cell and the disc 11 in the overlapping region 14 is equal to the thickness in the non-overlapping region 15; and in the same battery string, two adjacent battery pieces 11 meet the following conditions: the thickness of one cell 11 in the overlapping region 14 is less than the thickness in the non-overlapping region 15 and the thickness of the other cell and the disk 11 in the overlapping region 14 is equal to the thickness in the non-overlapping region 15.
The thickness of the cell 11 in the overlapping region 14 is 1/4-3/4 of the thickness of the cell 11 in the non-overlapping region 15. Within this range, the difference between the thickness of the overlapping region 14 and the thickness of the non-overlapping region 15 in the cell string structure can be effectively reduced, and the cell pieces 11 in the overlapping region 14 are ensured to have sufficient strength, so as to further avoid the problem of cracking of the cell pieces 11 in the overlapping region 14.
In addition, in two adjacent battery strings in the battery string structure, in the first direction, at least one battery piece includes a first face 16, a step face 17 located in the overlapping region 14, and a second face 18 located in the non-overlapping region 15, and the first face 16 is opposite to the step face 17 and the second face 18. In this embodiment, in the overlapping region 14, the step surface 17 of one cell 11 is opposite to the first surface 16 of the other cell 11.
In addition, the battery cell 11 may have a stepped single-layer structure at the overlap region 14. In this way, the overlapping region 14 may be thinned through an additional process after the cell 11 is manufactured.
Alternatively, the battery cell 11 may include at least a first layer structure and a second layer structure stacked, the first layer structure being located in the overlapping region 14 and the non-overlapping region 15, and the second layer structure being located in the non-overlapping region 15. After the battery pieces 11 with the multilayer structure are stacked, a step structure can be naturally formed, that is, the reduction of the process steps can be facilitated by using the manufacturing process of the battery pieces 11 to finish the thinning treatment of the overlapping region 14.
It can be understood that how to form the battery piece 11 with the thickness difference can be reasonably selected according to the manufacturing process of the battery piece.
In addition, the battery string structure may further include: and the welding strip or the conductive adhesive realizes the series connection of adjacent battery pieces in the same battery string through the welding strip or the conductive adhesive, wherein the welding strip can be an ultrathin welding strip or a round wire welding strip.
The battery string structure can reduce the difference between the total thickness of the overlapped part of the adjacent battery pieces and the thickness of the non-overlapped part of the battery pieces, thereby reducing the stress concentration degree of the overlapped part of the adjacent battery pieces, reducing the risk of hidden cracking or breaking of the battery pieces and improving the yield of the photovoltaic module in the laminating stage of manufacturing the photovoltaic module.
As shown in fig. 3, in this embodiment, the battery string structure may further include: and an overlap boundary region 5, wherein the overlap boundary region 5 is formed by overlapping adjacent cell strings in a first direction and a second direction, and at least one cell slice located in the overlap boundary region 5 has a notch 51.
In the process that the cell strings are sequentially arranged, the total thickness of the overlapping junction area 5 can be reduced by the cell pieces with the unfilled corners, and the difference between the total thickness of the overlapping junction area 5 and the thickness of the cell pieces in the non-overlapping region 15 is reduced, so that the stress concentration degree of the overlapping junction area 5 is reduced in the lamination stage of manufacturing the photovoltaic module, the risk of hidden cracking or breakage of the overlapping junction area 5 is reduced, and the yield of the photovoltaic module is improved.
In one example, the three cells in the overlapping junction area 5 each have an unfilled corner 51, and the unfilled corner 51 of each cell is opposite to each other, so that one cell is retained in the overlapping junction area 5, and the overlapping junction area 5 can also receive light and convert the light into electric energy, thereby improving the light utilization rate of the photovoltaic module.
In other embodiments, the 4 battery pieces located in the overlapping junction area may each have a unfilled corner; or, 2 battery slices located in the overlapping junction area have notches, and the battery slices with the notches and the battery slices without the notches are arranged in a staggered mode, so that the battery slices are not in contact with the battery slices in the overlapping junction area, and the risk of hidden cracking of the battery slices is further reduced. Referring to fig. 4, the battery string structure of the present embodiment further includes: at least one insulating layer 19, the insulating layer 19 being located between adjacent cells 11 of the overlap region 14. The role of the insulating layer 19 includes: and adjacent battery strings are bonded to realize the electrical insulation between the adjacent battery strings, so that the string spacing in the battery string structure is eliminated, and the assembly efficiency of the photovoltaic module is improved.
The insulating layer 19 may be a transparent insulating layer coated between adjacent cells of the overlap region 14; may be an insulating paste applied between the adjacent battery cells in the overlap region 14 by a dispensing process; may be an insulating coating applied between adjacent cells in the overlap region 14 by a cell printing process. In addition, the thickness of the insulating layer 19 in the thickness direction of the cell is 0-100 mm.
It should be noted that, in the battery string structure, the placement of the adjacent battery strings may be sequentially placed in parallel or obliquely placed.
The utility model discloses the second embodiment still provides a battery cluster structure, and this battery cluster structure is roughly the same with the preceding embodiment, and the main difference includes: in the same battery string, the thicknesses of the battery pieces in the overlapping regions are equal to those of the battery pieces in the non-overlapping regions, and in the adjacent battery strings, the thicknesses of the battery pieces in the overlapping regions are smaller than those of the battery pieces in the non-overlapping regions. The following will explain in detail the battery string structure provided by the second embodiment of the present invention with reference to the drawings, and the same or corresponding parts as those in the previous embodiment can refer to the description of the previous embodiment, and will not be described in detail below.
Fig. 5 is a schematic top view of a battery string structure according to a second embodiment of the present invention; FIG. 6 is a cross-sectional view taken along line CC1 of FIG. 5; fig. 7 is a schematic cross-sectional view taken along the direction CC1 in fig. 5.
Referring to fig. 5 to 7 in combination, in the present embodiment, the cell string structure is suitable for forming a photovoltaic module, and the cell string structure includes: at least two cell strings sequentially arranged along a first direction, wherein adjacent cell strings are provided with an overlapping region 24 extending along a second direction, and the cell piece 21 further comprises a non-overlapping region 25 connected with the overlapping region 24; the thickness of at least one cell piece 21 located in the overlapping region 24 is less than the thickness of the cell piece 21 in the non-overlapping region 25.
The following will explain the structure of the battery string provided in the present embodiment in detail with reference to the accompanying drawings.
The battery piece 21 includes a first face 28, a second face 26, and a step face 27. In this embodiment, the step surface 27 of one cell 21 is opposite to the second surface 26 of the other cell 21.
In the embodiment, the thicknesses of the battery pieces 21 in the overlapping regions 24 are all equal to the thicknesses of the battery pieces 21 in the non-overlapping regions 25 in the same battery string, and the thicknesses of the battery pieces 21 in the overlapping regions 24 are all smaller than the thicknesses of the battery pieces 21 in the non-overlapping regions 25 in the adjacent battery strings.
In one example, as shown in fig. 6, there are 2 overlapping regions 24 for the same cell string, wherein 2 overlapping regions 24 all satisfy the above requirement, i.e., the thickness of the cell pieces 21 in the overlapping regions 24 is equal to the thickness of the cell pieces 21 in the non-overlapping regions 25 in the same cell string.
In yet another example, as shown in fig. 7, there are 2 overlapping regions 24 for the same cell string, wherein 1 overlapping region 24 meets the above requirement (in the same cell string, the thicknesses of the cell sheets 21 in the overlapping regions 24 are all equal to the thicknesses of the cell sheets 21 in the non-overlapping regions 25), and another overlapping region 24 may be formed such that the thickness of the overlapping region 24 is smaller than the thickness of the non-overlapping region 25 of the cell sheet 21.
The cell string structure of the embodiment can also reduce the difference between the total thickness of the overlapping region 24 and the thickness of the cell pieces in the non-overlapping region 25, thereby reducing the stress concentration degree of the overlapping region 24, reducing the risk of hidden cracking or breaking, and improving the yield of the photovoltaic module.
The utility model discloses the third embodiment still provides a battery cluster structure, and this battery cluster structure is roughly the same with the preceding embodiment, and the main difference includes: in the adjacent battery strings, the thickness of the two battery pieces in the same overlapping area is smaller than that of the battery pieces in the non-overlapping area. The following will explain in detail a battery string structure provided by a third embodiment of the present invention with reference to the drawings, and the same or corresponding parts as those in the previous embodiment can refer to the description of the previous embodiment, and will not be described in detail below.
Fig. 8 is a schematic top view of a battery string structure according to a third embodiment of the present invention; fig. 9 is a schematic cross-sectional view taken along direction DD1 in fig. 8.
Referring to fig. 8 and 9 in combination, in the present embodiment, the cell string structure is suitable for forming a photovoltaic module, and the cell string structure includes: at least two cell strings sequentially arranged along a first direction, wherein adjacent cell strings are provided with an overlapping region 34 extending along a second direction, and the cell sheet 31 further comprises a non-overlapping region 35 connected with the overlapping region 34; the thickness of at least one of the battery pieces 31 located in the overlapping region 34 is smaller than the thickness of the battery piece 31 located in the non-overlapping region 35.
The following will explain the structure of the battery string provided in the present embodiment in detail with reference to the accompanying drawings.
In the present embodiment, in the adjacent battery strings, the thickness of each of the two battery pieces 31 in the same overlapping region 34 is smaller than the thickness of the battery piece 31 in the non-overlapping region 35. In addition, in two adjacent battery strings in the battery string structure, in the first direction, at least one battery piece includes a first surface 36, a step surface 37 located in the overlapping region 34, and a second surface 38 located in the non-overlapping region 35, and the first surface 36 is opposite to the step surface 37 and the second surface 38; in the overlapping region 34, the step surface 37 of one cell 31 is directly opposite to the step surface 37 of the other cell 31.
Compared with the foregoing embodiment, in the cell string structure of the embodiment, the thicknesses of the two cell pieces 31 in the same overlapping region 34 are both smaller than the thickness of the cell piece 31 in the non-overlapping region 35, so that the difference between the total thickness of the overlapping region 34 and the thickness of the cell piece in the non-overlapping region 35 can be significantly reduced, the stress concentration degree of the overlapping region is effectively reduced, the risk of hidden cracking or breaking is reduced, and the yield of the photovoltaic module is further improved.
The fourth embodiment of the present invention further provides a photovoltaic module, which includes the battery string structure of any one of the above embodiments. Fig. 10 is a schematic cross-sectional view of a photovoltaic module according to a fourth embodiment of the present invention; fig. 11 is a schematic cross-sectional view of a photovoltaic module according to a fourth embodiment of the present invention.
Referring to fig. 10 and 11, the photovoltaic module includes: a battery string structure 3; and the packaging adhesive film 1 is used for packaging the battery string structure 3.
Specifically, the photovoltaic module further includes: the battery string structure comprises a first cover plate 101 and a second cover plate 102 which are oppositely arranged, and a battery string structure 3 and a packaging adhesive film 1 are positioned between the first cover plate 101 and the second cover plate 102.
As shown in fig. 10, the battery string structure 3 may be disposed in parallel with respect to the first cap plate 101; as shown in fig. 11, the battery string structure 3 may be disposed obliquely with respect to the first cover plate 101.
Since the overlapping area of the battery string structure is more prone to hidden cracking than the non-overlapping area, a packaging adhesive film with a special structure is proposed for this purpose, and fig. 12 to 15 are schematic diagrams of 4 structures of the packaging adhesive film provided in this embodiment, specifically, the packaging adhesive film includes: the adhesive film body 71 and the plurality of adhesive film protrusions 61 are disposed on the adhesive film body 71, and the position of each adhesive film protrusion 61 is opposite to the position of each overlapping area of the battery string structure of any of the above embodiments.
Because the right area of the overlapping area is provided with the adhesive film bulge 61, the arrangement of the adhesive film bulge 61 is beneficial to relieving the laminating pressure on the overlapping area in the laminating stage, and the risk of hidden cracking of the battery piece is further reduced.
As shown in fig. 12, the film protrusions 61 are arranged in an array on the film body 71; as shown in fig. 13, the film protrusions 61 are arranged on the film body 71 in a grid pattern; as shown in fig. 14, the film protrusions 61 are arranged on the film body 71 in a staggered manner; as shown in fig. 15, the film protrusions 61 are arranged on the film body 71 in discrete strips.
It can be understood that the specific arrangement mode of the adhesive film protrusions 61 on the adhesive film body 71 is related to the specific arrangement of the cell string structures in the photovoltaic module, and the arrangement mode between the adhesive film protrusions 61 and the adhesive film body 71 can be set reasonably according to the specific arrangement of the cell string structures.
The embodiment provides a photovoltaic module with excellent structural performance, and the difference between the thickness of the overlapping region and the thickness of the non-overlapping region in the cell string structure is small, so that the problem of stress concentration generated in the overlapping region in the laminating stage is favorably reduced, the risk of hidden cracking of the cell is further reduced, and the yield and the reliability of the photovoltaic module are improved.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A cell string structure adapted to form a photovoltaic module, the cell string structure comprising: the battery pack comprises at least two battery strings which are sequentially arranged along a first direction, wherein each battery string comprises a plurality of battery pieces which are sequentially connected in series along a second direction, the first direction is different from the second direction, the adjacent battery strings are provided with overlapping regions which extend along the second direction, and each battery piece also comprises a non-overlapping region which is connected with the overlapping regions;
and in the adjacent battery strings, the thickness of at least one battery piece in the same overlapping region is smaller than that of the non-overlapping region.
2. The battery string structure according to claim 1, wherein at least one of the battery pieces in two adjacent battery strings in the first direction includes a first face, a step face located in the overlapping region, and a second face located in the non-overlapping region, the first face being opposite to the step face and the second face; in the overlapping area, the step surface of one battery piece is opposite to the step surface of the other battery piece.
3. The battery string structure according to claim 1 or 2, wherein in the adjacent battery strings, the thicknesses of the two battery pieces in the same overlapping region are both smaller than the thickness of the battery piece in the non-overlapping region.
4. The battery string structure according to claim 1 or 2, wherein in the same battery string in the second direction, the thickness of the cell pieces of one of the overlapping regions is smaller than the thickness of the cell pieces of the non-overlapping region, and the thickness of the cell pieces of the adjacent overlapping regions is equal to the thickness of the cell pieces of the non-overlapping region; or in one battery string, the thicknesses of the battery pieces in the overlapping regions are all equal to the thicknesses of the battery pieces in the non-overlapping regions, and in the adjacent battery strings, the thicknesses of the battery pieces in the overlapping regions are all smaller than the thicknesses of the battery pieces in the non-overlapping regions.
5. The battery string structure according to claim 1, further comprising: at least one insulating layer, the insulating layer is located between adjacent battery pieces in the overlapping region.
6. The battery string structure according to claim 1, wherein the battery pieces are of a single-layer structure having steps at the overlapping regions; or, the battery piece at least comprises a first layer structure and a second layer structure which are stacked, wherein the first layer structure is positioned in the overlapping region and the non-overlapping region, and the second layer structure is positioned in the non-overlapping region.
7. The battery string structure according to claim 1, wherein at least one of the battery cells in the adjacent battery strings satisfies: the thickness of the battery piece in the overlapping area is 1/4-3/4 of the thickness of the battery piece in the non-overlapping area.
8. The battery string structure according to claim 1, further comprising: and the overlapping junction area is formed by overlapping adjacent battery strings in the first direction and the second direction, and at least one battery piece positioned in the overlapping junction area has a notch.
9. A photovoltaic module comprising the cell string structure according to any one of claims 1 to 8, further comprising: and the packaging adhesive film is used for packaging the battery string structure.
10. The photovoltaic module of claim 9, wherein the encapsulant film comprises: the adhesive film comprises an adhesive film body and a plurality of adhesive film bulges positioned on the adhesive film body, wherein the positions of the adhesive film bulges are opposite to the positions of the overlapping areas.
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| CN202021422324.1U CN212303689U (en) | 2020-07-17 | 2020-07-17 | Battery string structure and photovoltaic module |
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| CN202021422324.1U CN212303689U (en) | 2020-07-17 | 2020-07-17 | Battery string structure and photovoltaic module |
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Address after: 334100, No. 1, crystal Road, Shangrao Economic Development Zone, Jiangxi, China Patentee after: Jingke Energy Co.,Ltd. Patentee after: Jingke green energy (Shanghai) Management Co.,Ltd. Address before: 334100, No. 1, crystal Road, Shangrao Economic Development Zone, Jiangxi, China Patentee before: JINKO SOLAR Co.,Ltd. Patentee before: Jingke green energy (Shanghai) Management Co.,Ltd. |