CN218867119U - Solar cell module - Google Patents
Solar cell module Download PDFInfo
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- CN218867119U CN218867119U CN202222951224.3U CN202222951224U CN218867119U CN 218867119 U CN218867119 U CN 218867119U CN 202222951224 U CN202222951224 U CN 202222951224U CN 218867119 U CN218867119 U CN 218867119U
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- solar cell
- cell module
- adhesive film
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- adhesive
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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 utility model provides a solar cell module, which comprises a solar cell piece, wherein an electrode grid line is arranged on the solar cell piece; the interconnector is laid on the electrode grid line, is electrically connected with the electrode grid line, and is fixed on the electrode grid line through colloid. The solar cell module fixes the interconnector on the electrode grid line through the colloid, realizes non-welding low-temperature interconnection of the interconnector and the electrode grid line, and solves the problems that the amorphous silicon layer of the heterojunction cell is damaged by high-temperature welding, the cell with the main grid line is required to be adopted, the silver consumption in cell production is high, the cell module is difficult to slice, the reliability of the cell module is low and the like in the traditional solar cell module. The solar cell module can adopt a heterojunction solar cell, can reduce the silver consumption of the solar cell, can realize the flaking of the solar cell module, and has better reliability.
Description
Technical Field
The utility model relates to a solar cell technical field especially relates to a solar cell module.
Background
In the solar cell module, a plurality of solar cells are connected in series to form a cell string, and then the cell string is assembled to form the module. When a plurality of solar cells are connected in series, interconnectors (generally copper wires) need to be disposed on electrode grids of the solar cells to interconnect and conduct the plurality of solar cells.
The conventional solar cell module generally adopts high-temperature welding to weld the interconnector on the grid line of the solar cell. The solar cell module with the high-temperature welding interconnector is easy to damage the amorphous silicon layer of the heterojunction cell, and the main grid line is required to be arranged on the cell to provide welding tension. Therefore, the traditional process for welding the interconnectors at high temperature is difficult to be suitable for series connection of heterojunction battery pieces, can not realize the flaking of battery components, and has high silver paste consumption and high equipment precision requirement of the battery pieces; moreover, welding stress easily causes hidden cracking among battery strings, and reliability of the battery assembly is reduced.
Therefore, it is one of the research focuses in the field to provide a solar cell module which is suitable for a heterojunction cell, can reduce the silver consumption of the cell, realize the thinning of the cell module, and improve the reliability of the cell module.
SUMMERY OF THE UTILITY MODEL
Accordingly, it is necessary to provide a highly reliable solar cell module in which a cell module can be thinned without damaging an amorphous silicon layer.
According to an aspect of the present invention, there is provided a solar cell module, including:
the solar cell comprises a solar cell sheet, wherein an electrode grid line is arranged on the solar cell sheet; and
the interconnector is laid on the electrode grid line, is electrically connected with the electrode grid line, and is fixed on the electrode grid line through a colloid.
In some embodiments, the colloid is formed by curing an ultraviolet curing adhesive by ultraviolet light.
In some embodiments, the colloid at least partially surrounds the interconnect strip and at least partially surrounds the electrode grid lines electrically connected to the interconnect strip.
In some embodiments, the method further comprises:
the first adhesive film is arranged on one surface of the solar cell piece;
the second adhesive film is arranged on the surface of the solar cell sheet opposite to the first adhesive film;
the first cover plate is pressed on the surface of the first adhesive film, which is far away from the solar cell piece; and
and the second cover plate is pressed on the surface of the second adhesive film, which is deviated from the solar cell sheet.
In some embodiments, the colloid is a thermosetting elastic colloid disposed on the surface of the interconnector away from the electrode grid line, and the thermosetting elastic colloid tightly presses and fixes the interconnector on the electrode grid line.
In some embodiments, the method further comprises:
the third adhesive film is arranged on one surface of the solar cell piece;
the fourth adhesive film is arranged on the surface of the solar cell sheet opposite to the third adhesive film;
the third cover plate is pressed on the surface of the third adhesive film, which is away from the solar cell sheet; and
and the fourth cover plate is pressed on the surface of the third adhesive film, which is deviated from the solar cell sheet.
In some embodiments, the thickness of the third adhesive film and/or the fourth adhesive film is smaller than the diameter of the interconnection bar.
In some embodiments, the thermosetting elastic colloid is formed by thermosetting and shaping a thermosetting adhesive coated on the surface of the third cover plate or the fourth cover plate.
In some embodiments, the solar cell sheet is a heterojunction solar cell sheet.
In some embodiments, the solar cell is a solar cell without a main grid.
Compared with the prior art, the utility model discloses following beneficial effect has:
the interconnector is closely contacted and electrically connected with the electrode grid line, and is fixed on the electrode grid line through the colloid; compared with the traditional high-temperature welding solar cell module, the solar cell module fixes the interconnector on the electrode grid line through the colloid, realizes the non-welding low-temperature interconnection of the interconnector and the electrode grid line, and solves the problems that the high-temperature welding damages the amorphous silicon layer of the heterojunction cell, the cell piece with the main grid line needs to be adopted, the silver consumption of the cell piece production is higher, the cell module is difficult to flake, the reliability of the cell module is lower and the like of the traditional solar cell module.
Drawings
Fig. 1 is a schematic view illustrating a uv curable adhesive coated on the surface of an interconnector according to an embodiment of the present invention;
fig. 2 is a schematic top view of a solar cell in an embodiment of the present invention;
fig. 3 is a schematic view of an embodiment of the present invention in which the interconnector is tiled on the electrode grid line;
fig. 4 is a schematic view of an embodiment of the present invention in which the interconnector is connected to the electrode grid lines by an ultraviolet curable adhesive;
fig. 5 is a schematic view of an embodiment of the present invention in which the interconnector is laid on the electrode grid and the ends are fixed by glue;
fig. 6 is a schematic view illustrating a third cover plate and a fourth cover plate coated with thermosetting adhesive according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating the interconnection bar fixed on the electrode grid line by the thermosetting elastic adhesive according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a solar cell module according to an embodiment of the present invention, in which the interconnector is fixed by pressing with a thermosetting elastomer.
Description of the reference numerals:
10. a solar cell sheet; 11. an electrode grid line; 20. an interconnector; 30. a colloid; 31. ultraviolet curing adhesive; 32. a thermosetting adhesive; 40. a third adhesive film; 50. a fourth adhesive film; 60. a third cover plate; 70. a fourth cover plate; 80. a sizing point; 100. provided is a solar cell module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Conventional solar cell modules are generally formed by welding an interconnection bar (such as a copper wire) on an electrode grid of a solar cell sheet through high temperature welding. On one hand, the amorphous silicon layer of the heterojunction cell is easily damaged, so that the performance of the heterojunction solar cell module is influenced; on the other hand, in the solar cell module welded at high temperature, the main grid lines are required to be arranged on the cell pieces to provide welding tension, and the solar cell module is only suitable for the cell pieces with the main grid lines, so that silver paste consumption is high during production of the cell pieces, and the cell module can not be flaked; on the other hand, high-temperature welding has high precision requirements on equipment, and welding stress easily causes hidden cracking among battery strings, so that the reliability of the battery assembly is reduced.
In order to solve the above problem, referring to fig. 1 to 4, a first embodiment of the present invention provides a solar cell module 100, wherein the solar cell module 100 includes a solar cell sheet 10 and an interconnector 20.
Wherein, the solar cell 10 is provided with an electrode grid line 11; the interconnection bar 20 is laid on the electrode gate line 11, and the interconnection bar 20 is in close contact with and electrically connected to the electrode gate line 11. The interconnector 20 is fixed to the electrode grid 11 by a gel 30.
The solar cell module 100 is electrically connected by closely contacting the interconnector 20 with the electrode grid line 11, and the interconnector 20 is fixed on the electrode grid line 11 by the colloid 30; compared with the traditional high-temperature welding solar cell module 100, the solar cell module 100 fixes the interconnector 20 on the electrode grid line 11 through the colloid 30, realizes the non-welding low-temperature interconnection of the interconnector 20 and the electrode grid line 11, and solves the problems of the traditional solar cell module 100 that the high-temperature welding damages the amorphous silicon layer of the heterojunction cell, the cell with the main grid line needs to be adopted, the silver consumption of the cell production is high, the cell module is difficult to slice, the reliability of the cell module is low, and the like.
In some embodiments, the adhesive 30 is an ultraviolet curing adhesive 31 (UV glue) and is formed by curing the adhesive 30 by ultraviolet light. The ultraviolet curing adhesive 31 is cured by ultraviolet irradiation, so that the non-welding low-temperature interconnection of the interconnector 20 and the electrode grid line 11 can be realized, the interconnector 20 and the electrode grid line 11 can be kept in close contact and electric connection, and the operation is convenient.
In some of these embodiments, the gel 30 at least partially encapsulates the interconnect strip 20 and at least partially encapsulates the electrode grid lines 11 that are electrically connected to the interconnect strip 20. In other words, the sealant 30 covers at least a portion of the interconnection bar 20 and a portion of the electrode grid line 11 electrically connected to the interconnection bar 20; thereby enabling the interconnection bar 20 to be fixedly connected to the electrode gate line 11 electrically connected thereto.
In one specific example, when the interconnector 20 is fixed on the electrode gate line 11 through the adhesive 30, a layer of ultraviolet curing adhesive 31 may be coated on the interconnector 20, then the interconnector 20 is spread on the electrode gate line 11, and a pressure toward the electrode gate line 11 is applied to the interconnector 20, since the ultraviolet curing adhesive 31 has good fluidity, the adhesive at the contact portion of the interconnector 20 and the electrode gate line 11 may overflow outwards under the pressure, so that the interconnector 20 and the electrode gate line 11 are in close contact and electrically connected, and after being cured by ultraviolet light, the ultraviolet curing adhesive 31 may be cured to firmly connect the interconnector 20 and the electrode gate line 11 together. In this way, the vicinity of the contact part of the interconnection bar 20 and the electrode grid line 11 can be filled with the ultraviolet curing adhesive 31, and the stability of the connection between the interconnection bar 20 and the electrode grid line 11 is improved.
It is understood that the glue 30 is not limited to the above-mentioned glue applying manner between the interconnection bar 20 and the electrode grid lines 11, and other similar glue applying manners may be adopted, as long as the interconnection bar 20 and the corresponding electrode grid lines 11 are tightly and firmly connected to achieve electrical contact. For example, the interconnection bar 20 may be pressed onto the electrode gate line 11, and then a uv-curable adhesive 31 may be applied and cured at the connection to firmly connect the interconnection bar 20 to the electrode gate line 11. The interconnecting bars 20 may be made of a metal material having good electrical conductivity, such as copper wire. The interconnector 20 may connect a plurality of solar cells 10 in series to form a cell string.
It should be noted that the colloid 30 is not limited to the colloid 30 formed by ultraviolet curing the ultraviolet curing adhesive 31, and other similar colloids may also be used, as long as the interconnector 20 and the electrode gate line 11 can be firmly connected at a low temperature.
In some embodiments, the solar cell module 100 further includes a first adhesive film, a second adhesive film, a first cover plate and a second cover plate (not shown in the figures). Wherein, the first adhesive film is arranged on one surface of the solar cell piece 10; the second adhesive film is arranged on the surface of the solar cell piece 10 opposite to the first adhesive film; the first cover plate is pressed on the surface of the first adhesive film, which is far away from the solar cell piece 10; the second cover plate is pressed on the surface of the second adhesive film, which faces away from the solar cell sheet 10. In this way, the solar cell module 100 forms a laminated structure in which the first cover plate, the first adhesive film, the solar cell sheet 10, the second adhesive film, and the second cover plate are sequentially stacked.
In some of the embodiments, the first cover plate and the second cover plate may both be glass cover plates; one of the glass cover plates can be adopted, and the other glass cover plate can be adopted as the TPT back plate. The specific configuration may be determined according to the type of the solar cell module 100. The first adhesive film and the second adhesive film may be EVA (polyethylene-polyvinyl acetate) adhesive film with good light transmittance or other existing adhesive films.
The solar cell module 100 according to the first embodiment can be prepared by the following method:
firstly, spraying a layer of ultraviolet curing adhesive 31 on the interconnection strip 20 (as shown in figure 1); spreading the interconnecting strip 20 coated with the ultraviolet curing adhesive 31 on the electrode grid lines 11 of the solar cell 10 (as shown in fig. 3), and applying a certain pressure on the interconnecting strip 20 towards the electrode grid lines 11, wherein due to the good fluidity of the ultraviolet curing adhesive 31, the ultraviolet curing adhesive 31 at the interface where the interconnecting strip 20 and the electrode grid lines 11 are in contact with each other will overflow outwards under the action of the pressure, so that the interconnecting strip 20 and the electrode grid lines 11 are in close contact and electrical connection (as shown in fig. 4); then, irradiating the interconnecting strips 20 laid on the electrode grid lines 11 by using UV illumination equipment to cure the ultraviolet curing adhesive 31, so that the interconnecting strips 20 are fixed on the electrode grid lines 11; and then forming a sample in which the first cover plate, the first adhesive film, the solar cell sheet 10, the second adhesive film and the second cover plate are sequentially laminated, and laminating the sample in a laminating machine to obtain the solar cell module 100.
Referring to fig. 5 to 8, another solar cell module 100 according to a second embodiment of the present invention is provided, where the solar cell module 100 includes a solar cell sheet 10 and an interconnection bar 20.
Also, in this embodiment, the solar cell sheet 10 has an electrode grid line 11 thereon; the interconnector 20 is laid on the electrode gate line 11, and the interconnector 20 is in close contact with and electrically connected to the electrode gate line 11; the interconnector 20 is fixed to the electrode gate line 11 by a paste 30.
Specifically, referring to fig. 7 and 8, in this embodiment, the adhesive 30 is a thermosetting elastic adhesive disposed on the surface of the interconnection bar 20 away from the electrode grid line 11. The thermosetting elastomer gel tightly fixes the interconnector 20 to the electrode grid line 11.
The solar cell module 100 is characterized in that the interconnector 20 is in close contact with and electrically connected with the electrode grid line 11, and the surface of the interconnector 20, which is far away from the electrode grid line 11, is provided with a thermosetting elastic colloid, so that the interconnector 20 is tightly pressed and fixed on the electrode grid line 11 through the thermosetting elastic colloid; compared with the traditional high-temperature welding solar cell module 100, the solar cell module 100 also realizes the non-welding low-temperature interconnection of the interconnector 20 and the electrode grid line 11, and solves the problems that the amorphous silicon layer of the heterojunction cell is damaged by high-temperature welding, the cell sheet needs to be provided with the main grid line cell sheet, the silver consumption of the cell sheet is high, the cell module is difficult to flake, the reliability of the cell module is low and the like of the traditional solar cell module 100.
It is understood that the thermosetting elastic colloid is formed after the thermosetting adhesive 32 is heated, cured and shaped. The thermosetting adhesive 32 may be a commercially available material. The interconnector 20 can be pressed downwards and fixed on the electrode grid line 11 through the elasticity of the thermosetting elastic colloid, and the interconnector 20 can be in close contact with and electrically connected with the electrode grid line 11 after the thermosetting elastic colloid is cured and shaped.
In some embodiments, the solar cell module 100 further includes a third adhesive film 40, a fourth adhesive film 50, a third cover plate 60 and a fourth cover plate 70. The third adhesive film 40 is arranged on one surface of the solar cell piece 10; the fourth adhesive film 50 is arranged on the surface of the solar cell piece 10 opposite to the third adhesive film 40; the third cover plate 60 is pressed on the surface of the third adhesive film 40 away from the solar cell sheet 10; the fourth cover plate 70 is laminated on the surface of the third adhesive film 40 facing away from the solar cell sheet 10. In this way, the solar cell module 100 has a laminated structure in which the third cover sheet 60, the third adhesive film 40, the solar cell sheet 10, the fourth adhesive film 50, and the fourth cover sheet 70 are sequentially laminated.
In some of these embodiments, the third cover plate 60 and the fourth cover plate 70 may both be glass cover plates; one of the two sheets can be a glass cover plate, and the other sheet can be a TPT back plate. The specific determination may be made according to the type of the solar cell module 100. The third adhesive film 40 and the fourth adhesive film 50 may be EVA adhesive films with good light transmittance or other existing adhesive films.
In some embodiments, the thermosetting elastic gel is formed by thermosetting and shaping the thermosetting adhesive 32 coated on the surface of the third cover plate 60 or the fourth cover plate 70. That is, the thermosetting adhesive 32 may be coated on one surface of the third cover plate 60 or the fourth cover plate 70, then the surface of the third cover plate 60 or the fourth cover plate 70 coated with the thermosetting adhesive 32 is pressed against the interconnection strip 20, the interconnection strip 20 is pressed against the electrode grid lines 11, and the thermosetting adhesive 32 is cured by heating to form a thermosetting elastic adhesive.
In some of these embodiments, the thickness of the third adhesive film 40 and/or the fourth adhesive film 50 is less than the diameter of the interconnecting strap 20. In this way, the third adhesive film 40 and/or the fourth adhesive film 50 may not completely cover the interconnector 20, and the thermosetting elastic adhesive may be better contacted with the interconnector 20 to better press-fix the interconnector 20.
In the present invention, the solar cell 10 may be a heterojunction solar cell or other types of solar cells; because the utility model discloses do not use high temperature welding to realize being connected of interconnector 20 and electrode grid line, can not cause destruction to the amorphous silicon layer in the heterojunction solar wafer. Additionally, the utility model discloses need not to set up the main grid line in order to provide welding pulling force on solar wafer 10, consequently can adopt the solar wafer 10 that does not have the main grid, can reduce the silver of battery piece and consume, realize solar module 100's thin slice.
The solar cell module 100 according to the second embodiment can be prepared by the following method:
firstly, flatly laying the interconnectors 20 on the electrode grid lines 11 of the solar cell 10 to ensure that the interconnectors 20 are perpendicular to the electrode grid lines 11; fixing two ends of the electrode grid line 11 on the solar cell piece 10 by using thermosetting glue, and forming a glue applying point 80 at the fixing position of the thermosetting glue (as shown in fig. 5); applying a thermosetting adhesive 32 (shown in fig. 6) on the third cover sheet 60 and the fourth cover sheet 70; then, a sample (as shown in fig. 8) in which a third cover plate 60, a third adhesive film 40, a solar cell sheet 10, a fourth adhesive film 50, and a fourth cover plate 70 are sequentially stacked is formed, the sample is placed in a laminating machine for lamination, the thermosetting adhesive 32 is cured by using heat in the lamination process to form a thermosetting elastic adhesive, and the interconnector 20 is pressed and fixed. After the lamination is completed, the solar cell module 100 is obtained.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims, and the description and drawings can be used to interpret the contents of the claims.
Claims (10)
1. A solar cell module, comprising:
the solar cell comprises a solar cell sheet, wherein an electrode grid line is arranged on the solar cell sheet; and
the interconnector is laid on the electrode grid line, is electrically connected with the electrode grid line, and is fixed on the electrode grid line through a colloid.
2. The solar cell module as claimed in claim 1, wherein the adhesive is formed by curing an ultraviolet curing adhesive by ultraviolet irradiation.
3. The solar cell assembly of claim 1 wherein the gel at least partially encapsulates the interconnect strip and at least partially encapsulates the electrode grid lines electrically connected to the interconnect strip.
4. The solar cell module according to any one of claims 1 to 3, further comprising:
the first adhesive film is arranged on one surface of the solar cell piece;
the second adhesive film is arranged on the surface of the solar cell sheet opposite to the first adhesive film;
the first cover plate is pressed on the surface of the first adhesive film, which is far away from the solar cell sheet; and
and the second cover plate is pressed on the surface of the second adhesive film departing from the solar cell piece.
5. The solar cell module as claimed in claim 1, wherein the adhesive is a thermosetting elastic adhesive disposed on a surface of the interconnector facing away from the electrode grid lines, and the thermosetting elastic adhesive fixes the interconnector to the electrode grid lines in a pressing manner.
6. The solar cell module of claim 5, further comprising:
the third adhesive film is arranged on one surface of the solar cell piece;
the fourth adhesive film is arranged on the surface of the solar cell sheet opposite to the third adhesive film;
the third cover plate is pressed on the surface of the third adhesive film, which is far away from the solar cell piece; and
and the fourth cover plate is pressed on the surface of the third adhesive film departing from the solar cell piece.
7. The solar cell module according to claim 6, wherein the thickness of the third adhesive film and/or the fourth adhesive film is smaller than the diameter of the interconnector.
8. The solar cell module according to claim 6, wherein the thermosetting elastic colloid is formed by thermosetting and shaping a thermosetting adhesive coated on the surface of the third cover plate or the fourth cover plate.
9. The solar cell module according to any one of claims 1 to 3 and 5 to 8, wherein the solar cell sheet is a heterojunction solar cell sheet.
10. The solar cell module according to any one of claims 1 to 3 and 5 to 8, wherein the solar cell sheet is a solar cell sheet without a main grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222951224.3U CN218867119U (en) | 2022-11-07 | 2022-11-07 | Solar cell module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222951224.3U CN218867119U (en) | 2022-11-07 | 2022-11-07 | Solar cell module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218867119U true CN218867119U (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222951224.3U Active CN218867119U (en) | 2022-11-07 | 2022-11-07 | Solar cell module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218867119U (en) |
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2022
- 2022-11-07 CN CN202222951224.3U patent/CN218867119U/en active Active
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