CN220172148U - Solar cell interconnection structure and solar cell module - Google Patents
Solar cell interconnection structure and solar cell module Download PDFInfo
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- CN220172148U CN220172148U CN202321576691.0U CN202321576691U CN220172148U CN 220172148 U CN220172148 U CN 220172148U CN 202321576691 U CN202321576691 U CN 202321576691U CN 220172148 U CN220172148 U CN 220172148U
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- solar cell
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- electrode
- grid lines
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- 238000003466 welding Methods 0.000 claims abstract description 78
- 239000002313 adhesive film Substances 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 15
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000008393 encapsulating agent Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Classifications
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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
Abstract
The utility model provides a solar cell interconnection structure and a solar cell module, wherein the solar cell interconnection structure comprises: solar cell, electrode grid line and welding wire; the electrode grid line comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back of the solar cell; the solar cell comprises a positive solar cell and a negative solar cell; the electrode grid lines are sequentially arranged on the back of the positive solar cell according to the alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines are sequentially arranged on the back of the negative electrode solar cell according to the alternating sequence of the negative electrode grid lines and the positive electrode grid lines; the positive electrode grid line on one side of the positive electrode solar cell is connected with the negative electrode grid line on one side of the adjacent negative electrode solar cell through welding wires; the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through welding wires, so that the problems of high interconnection difficulty and low utilization rate of the solar cells are solved.
Description
Technical Field
The present utility model relates to the field of solar cell modules, and in particular, to a solar cell interconnection structure and a solar cell module.
Background
The solar cell module is a device for converting solar energy into electric energy, and is manufactured by one or more solar cells through solar cell interconnection, encapsulation and other processes.
Among them, solar cell interconnection is a very central technology, and in some embodiments, the front and back electrodes of the solar cells are optionally interconnected by welding wires/ribbons, which interconnect the front and back electrodes of the solar cells, resulting in a larger gap between two adjacent solar cells, resulting in a reduced effective area. In addition, the edge of the solar cell and the junction of the welding wire/welding strip are prone to physical damage, increasing the risk of failure. In some embodiments, the single-side electrodes of the optional back contact solar cells are interconnected in a mode of conducting back plate connection or welding of a welding strip, wherein the conducting back plate connection mode needs to be customized, and conducting glue is also needed, so that the structure is complex, and the process difficulty is increased; the welding mode of the back contact welding strip cannot be directly welded by using a series welding machine, some insulating layers are required to be paved, stress is generated during high-temperature welding, the solar cell is bent, the process fragment rate is influenced, and the process difficulty is increased.
Disclosure of Invention
The utility model provides a solar cell interconnection structure and a solar cell module, which are used for solving the problems of high solar cell interconnection difficulty and low utilization rate.
In a first aspect, the present utility model provides a solar cell interconnection structure, comprising: solar cell, electrode grid line and welding wire.
The electrode grid line comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back of the solar cell; the solar cell comprises a positive electrode solar cell and a negative electrode solar cell; the electrode grid lines are sequentially arranged on the back of the positive solar cell in an alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines are sequentially arranged on the back surface of the negative electrode solar cell in an alternating sequence of the negative electrode grid lines and the positive electrode grid lines; the positive electrode grid line at one side of the positive electrode solar cell is connected with the negative electrode grid line at one side of the adjacent negative electrode solar cell through the welding wire; the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire.
Firstly, arranging the positive grid line and the negative grid line on the back surface of the solar cell, and then connecting the positive grid line on one side of the positive solar cell with the negative grid line on one side of the adjacent negative solar cell through the welding wire; the negative grid line on the other side of the positive solar cell is connected with the positive grid line on one side of the adjacent negative solar cell, so that the electrode grid line connection mode of the two adjacent solar cells is positive-negative or negative-positive, the area of the front side of the solar cell is not occupied, the solar cells are not easy to damage, the interconnection process is simple, and the problems of high interconnection difficulty and low utilization rate of the solar cells are solved.
Optionally, the electrode grid line is in a strip structure; the electrode grid lines on the same solar cell are parallel to each other.
The electrode grid lines are of strip-shaped structures, the electrode grid lines are more convenient to arrange, the electrode grid lines on the same solar cell are parallel to each other, the probability of short circuit and other conditions caused by crossed arrangement is reduced, the solar cells are more convenient to interconnect, and the occurrence of connection errors during the solar cell interconnection is reduced.
Optionally, the solar cell interconnection structure further comprises a shadowless glue, and the electrode grid line is connected to the back of the solar cell through the shadowless glue.
Through the shadowless glue connection, the curing can be rapidly carried out at room temperature only by ultraviolet irradiation, and the use is convenient and rapid; the connection state of the electrode grid line can be clearly seen; in addition, the shadowless glue has lower flammability and less environmental pollution.
Optionally, the outer surface of the solar cell is of a rectangular structure.
The outer surface of the solar cell is of a rectangular structure, so that the electrode grid lines are conveniently distributed on the back surface of the solar cell, and a plurality of solar cells are conveniently interconnected.
Optionally, the welding wire comprises a welding wire body and a tin layer; the welding wire body is thread-shaped, and the tin layer is arranged on the surface of the welding wire body.
Through will the tin layer sets up the surface of welding wire body not only can reduce the probability of welding wire body oxidation, the tin layer oxidation back conductivity is better moreover, reduces contact resistance's increase.
Optionally, the plurality of electrode grid lines are symmetrically arranged with the center of the solar cell as a symmetry point.
The electrode grid lines are symmetrically arranged by taking the center of the solar cell as a symmetrical point, so that the positive electrode solar cell can be converted into the negative electrode solar cell after rotating 180 degrees, and the solar cell is more convenient to manufacture and use.
Optionally, the cross section of the welding wire is round, and the diameter of the cross section of the welding wire is 0.15mm-0.3mm; the distance between two adjacent solar cells is 0.3mm-0.5mm.
The cross section diameter of the welding wire is 0.15mm-0.3mm, so that the welding wire is convenient to connect with the electrode grid line, and current collected by the solar cell can be safely loaded. The distance between two adjacent solar cells is 0.3mm-0.5mm, and the distance between the solar cells is smaller than twice the cross section diameter of the welding wire and is larger than or equal to the cross section diameter of the welding wire, so that the probability of bending the welding wire is reduced, and the risk of damage to the welding wire is reduced.
In a second aspect, the present utility model provides a solar cell module comprising an encapsulation layer, a bus bar, a junction box and a solar cell interconnection structure according to any one of the above aspects of the present utility model; the packaging layer is arranged on the outer surface of the solar cell interconnection structure; welding wires at two ends of the solar cell interconnection structure are connected with the bus bars; the junction box is electrically connected with the solar cell interconnection structure.
The solar cell module has all the beneficial effects of any one of the above solar cell interconnection structures, and will not be described herein. The packaging layer plays a role in fixing, protecting and insulating the solar cell interconnection structure. The bus bar is used for connecting a plurality of welding wires and distributing power. The junction box is used for connecting other devices.
Optionally, the packaging layer includes a back plate, a first adhesive film, a second adhesive film, and a glass plate; the backboard, the first adhesive film, the solar cell interconnection structure, the second adhesive film and the glass plate are sequentially connected.
The backboard is used for arranging and fixing the solar cell interconnection structure; the first adhesive film and the second adhesive film are used for connecting the glass plate, the solar cell interconnection structure and the back plate together; the glass plate can isolate and protect the solar cell interconnection structure from being oxidized and damaged by air; and does not shade sunlight.
As can be seen from the above technical solution, the present utility model provides a solar cell interconnection structure, a solar cell module and an interconnection method, wherein the solar cell interconnection structure includes: solar cell, electrode grid line and welding wire; the electrode grid line comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back of the solar cell; the solar cell comprises a positive electrode solar cell and a negative electrode solar cell; the electrode grid lines are sequentially arranged on the back of the positive solar cell in an alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines are sequentially arranged on the back surface of the negative electrode solar cell in an alternating sequence of the negative electrode grid lines and the positive electrode grid lines; the positive electrode grid line at one side of the positive electrode solar cell is connected with the negative electrode grid line at one side of the adjacent negative electrode solar cell through the welding wire; the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire, so that the problems of high interconnection difficulty and low utilization rate of the solar cells are solved.
Drawings
In order to more clearly illustrate the technical solution of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a front structure of a solar cell of the solar cell interconnection structure according to the present utility model;
fig. 2 is a schematic view of a back structure of a solar cell of the solar cell interconnection structure according to the present utility model;
fig. 3 is a schematic structural diagram of a solar cell interconnection structure according to the present utility model;
fig. 4 is a schematic diagram of a shadowless glue position of a solar cell interconnection structure according to the present utility model.
Illustration of:
wherein, 1-solar cell; 2-electrode grid lines; 3-welding wires; 4-shadowless glue.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the utility model. Merely exemplary of systems and methods consistent with aspects of the utility model as set forth in the claims.
The solar cell module is a device for converting solar energy into electric energy, and is manufactured by one or more solar cells through solar cell interconnection, encapsulation and other processes.
Among them, solar cell interconnection is a very central technology, and in some embodiments, the front and back electrodes of the solar cells are optionally interconnected by welding wires/ribbons, which interconnect the front and back electrodes of the solar cells, resulting in a larger gap between two adjacent solar cells, resulting in a reduced effective area. In addition, the edge of the solar cell and the junction of the welding wire/welding strip are prone to physical damage, increasing the risk of failure. In some embodiments, the single-side electrodes of the optional back contact solar cells are interconnected in a mode of conducting back plate connection or welding of a welding strip, wherein the conducting back plate connection mode needs to be customized, and conducting glue is also needed, so that the structure is complex, and the process difficulty is increased; the welding mode of the back contact welding strip cannot be directly welded by using a series welding machine, some insulating layers are required to be paved, stress is generated during high-temperature welding, the solar cell is bent, the process fragment rate is influenced, and the process difficulty is increased.
In order to solve the problems of high solar cell interconnection difficulty and low utilization rate, refer to fig. 1-4, wherein fig. 1 is a schematic diagram of a front structure of a solar cell interconnection structure; fig. 2 is a schematic view of a back structure of a solar cell interconnection structure; FIG. 3 is a schematic view of a solar cell interconnect structure; fig. 4 is a schematic diagram of a position of a shadowless glue 4 of a solar cell interconnection structure. The utility model provides a solar cell interconnection structure and a solar cell module.
Some embodiments of the present utility model provide a solar cell interconnection structure, including: solar cell 1, electrode grid line 2 and welding wire 3.
Wherein the electrode grid line 2 comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back surface of the solar cell 1; the solar cell 1 comprises a positive electrode solar cell and a negative electrode solar cell; the electrode grid lines 2 are sequentially arranged on the back of the positive solar cell in an alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines 2 are sequentially arranged on the back of the negative solar cell according to the alternating sequence of the negative grid lines and the positive grid lines; the positive electrode grid line on one side of the positive electrode solar cell is connected with the negative electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire 3; the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire 3.
It should be understood that the front surface of the solar cell 1 does not need to be provided with a metal electrode, and only the back surface of the solar cell 1 is provided with a metal electrode, wherein the electrode grid line 2 is an electrode main grid line in the metal electrode, and no electrode main grid line portion perpendicular to the electrode main grid line is shown in the figure. In addition, as shown in fig. 3 to 4, the welding wire 3 is overlapped with both the negative electrode grid line and the positive electrode grid line.
Firstly, arranging the positive grid line and the negative grid line on the back surface of the solar cell 1, and then connecting the positive grid line on one side of the positive solar cell with the negative grid line on one side of the adjacent negative solar cell through the welding wire 3; the anode grid line on the other side of the anode solar cell is connected with the anode grid line on one side of the adjacent anode solar cell through the welding wire 3, so that the electrode grid lines 2 of the adjacent two solar cells 1 are connected in a positive-negative or negative-positive mode, the front area of the solar cells 1 is not occupied, the solar cells 1 are not easy to damage, the interconnection process is simple, and the problems of high interconnection difficulty and low utilization rate of the solar cells are solved.
In some embodiments, the electrode grid line 2 is in a strip structure; the electrode grid lines 2 on the same solar cell 1 are parallel to each other.
The electrode grid lines 2 are of strip-shaped structures, the electrode grid lines 2 are more convenient to arrange, the electrode grid lines 2 on the same solar cell 1 are parallel to each other, the probability of short circuit and other conditions caused by crossed arrangement is reduced, the solar cells 1 are more convenient to interconnect, and the occurrence of connection errors when the solar cells 1 are interconnected is reduced.
In some embodiments, the solar cell interconnection structure further includes a shadowless glue 4, and the electrode grid line 2 is connected to the back surface of the solar cell 1 through the shadowless glue 4.
The shadowless glue 4 is connected, so that the curing can be rapidly carried out at room temperature only by ultraviolet irradiation, a high-temperature process is not needed, and the use is convenient and rapid; the connection state of the electrode grid line 2 can be clearly seen; in addition, the shadowless glue 4 has lower flammability and less environmental pollution.
In some embodiments, the outer surface of the solar cell 1 is rectangular in structure.
The outer surface of the solar cell 1 is of a rectangular structure, so that the electrode grid lines 2 are conveniently distributed on the back surface of the solar cell 1, and a plurality of solar cells 1 are conveniently interconnected.
In some embodiments, the dimensions of the solar cell 1 may be any one of 182mm by 182mm, 210mm by 105mm, 182mm by 91 mm. On the one hand, as the size of the solar cell 1 is reduced, the series resistance is reduced, so that the electrical loss of the solar cell 1 can be reduced, the photoelectric conversion efficiency under high-concentration light is increased, and on the other hand, the solar cell 1 is more convenient to interconnect.
In some embodiments, the welding wire 3 comprises a wire body and a tin layer; the welding wire body is thread-shaped, and the tin layer is arranged on the surface of the welding wire body.
The tin layer is arranged on the surface of the welding wire body, so that the probability of oxidation of the welding wire body can be reduced, the tin layer is good in conductivity after oxidation, and the increase of contact resistance is reduced.
In some embodiments, the electrode grid lines 2 are symmetrically arranged with the center of the solar cell 1 as a symmetry point.
The electrode grid lines 2 are symmetrically arranged by taking the center of the solar cell 1 as a symmetrical point, so that the positive electrode solar cell can be converted into the negative electrode solar cell by rotating 180 degrees, and the manufacturing and the use are more convenient.
In some embodiments, the cross section of the welding wire 3 is circular, and the cross section diameter of the welding wire 3 is 0.15mm-0.3mm; the distance between two adjacent solar cells 1 is 0.3mm-0.5mm.
The cross section diameter of the welding wire 3 is 0.15mm-0.3mm, so that the welding wire is convenient to connect with the electrode grid line 2, and the current collected by the solar cell 1 can be safely loaded. The distance between two adjacent solar cells 1 is 0.3mm-0.5mm, and the distance between the solar cells 1 is smaller than two times of the cross section diameter of the welding wire 3, and the distance between the solar cells 1 is larger than or equal to the cross section diameter of the welding wire 3, so that the bending probability of the welding wire 3 is reduced, and the risk of damage to the welding wire 3 is reduced.
Some embodiments of the present utility model provide a solar cell module including an encapsulation layer, a bus bar, a junction box, and a solar cell interconnection structure having any of the above embodiments of the present utility model; the packaging layer is arranged on the outer surface of the solar cell interconnection structure; welding wires 3 at two ends of the solar cell interconnection structure are connected with the bus bars; the junction box is electrically connected with the solar cell interconnection structure.
The solar cell module has all the beneficial effects of any one of the above solar cell interconnection structures, and will not be described herein. The packaging layer plays a role in fixing, protecting and insulating the solar cell interconnection structure. The bus bar is used for connecting a plurality of welding wires 3 and distributing electric power. The junction box is used for connecting other devices.
In some embodiments, the encapsulation layer includes a back plate, a first adhesive film, a second adhesive film, and a glass plate; the backboard, the first adhesive film, the solar cell interconnection structure, the second adhesive film and the glass plate are sequentially connected.
The backboard is used for arranging and fixing the solar cell interconnection structure; the first adhesive film and the second adhesive film are used for connecting the glass plate, the solar cell interconnection structure and the back plate together; the glass plate can isolate and protect the solar cell interconnection structure from being oxidized and damaged by air; and does not shade sunlight.
As can be seen from the above technical solutions, the embodiments of the present utility model provide a solar cell interconnection structure, a solar cell module, and an interconnection method, where the solar cell interconnection structure includes: a solar cell 1, an electrode grid line 2 and a welding wire 3; wherein the electrode grid line 2 comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back surface of the solar cell 1; the solar cell 1 comprises a positive electrode solar cell and a negative electrode solar cell; the electrode grid lines 2 are sequentially arranged on the back of the positive solar cell in an alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines 2 are sequentially arranged on the back of the negative solar cell according to the alternating sequence of the negative grid lines and the positive grid lines; the positive electrode grid line on one side of the positive electrode solar cell is connected with the negative electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire 3; the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire 3, so that the problems of high interconnection difficulty and low utilization rate of the solar cells are solved.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present utility model. Any other embodiments which are extended according to the solution of the utility model without inventive effort fall within the scope of protection of the utility model for a person skilled in the art.
Claims (9)
1. A solar cell interconnection structure, comprising: a solar cell (1), an electrode grid line (2) and a welding wire (3);
the electrode grid line (2) comprises an anode grid line and a cathode grid line; the number of the positive grid lines is equal to that of the negative grid lines; the positive grid line and the negative grid line are arranged on the back surface of the solar cell (1); the solar cell (1) comprises a positive solar cell and a negative solar cell; the electrode grid lines (2) are sequentially arranged on the back of the positive solar cell according to the alternating sequence of the positive grid lines and the negative grid lines; the electrode grid lines (2) are sequentially arranged on the back surface of the negative electrode solar cell according to the alternating sequence of the negative electrode grid lines and the positive electrode grid lines; the positive electrode grid line at one side of the positive electrode solar cell is connected with the negative electrode grid line at one side of the adjacent negative electrode solar cell through the welding wire (3); the negative electrode grid line on the other side of the positive electrode solar cell is connected with the positive electrode grid line on one side of the adjacent negative electrode solar cell through the welding wire (3).
2. Solar cell interconnection structure according to claim 1, characterized in that the electrode grid lines (2) are strip-like structures; the electrode grid lines (2) on the same solar cell (1) are parallel to each other.
3. The solar cell interconnection structure according to claim 1, further comprising a shadowless glue (4), wherein the electrode grid line (2) is connected to the back of the solar cell (1) through the shadowless glue (4).
4. Solar cell interconnection structure according to claim 1, characterized in that the outer surface of the solar cell (1) is of rectangular structure.
5. Solar cell interconnect according to claim 1, characterized in that the welding wire (3) comprises a wire body and a tin layer; the welding wire body is thread-shaped, and the tin layer is arranged on the surface of the welding wire body.
6. Solar cell interconnection structure according to claim 1, characterized in that several electrode grid lines (2) are arranged symmetrically with respect to the centre of the solar cell (1) as a point of symmetry.
7. Solar cell interconnection structure according to claim 1, characterized in that the cross section of the welding wire (3) is circular, the cross section diameter of the welding wire (3) is 0.15mm-0.3mm; the distance between two adjacent solar cells (1) is 0.3mm-0.5mm.
8. A solar cell module comprising an encapsulant layer, a bus bar, a junction box, and the solar cell interconnect structure of any one of claims 1-7; the packaging layer is arranged on the outer surface of the solar cell interconnection structure; welding wires (3) at two ends of the solar cell interconnection structure are connected with the bus bars; the junction box is electrically connected with the solar cell interconnection structure.
9. The solar module of claim 8, wherein the encapsulant layer comprises a back sheet, a first adhesive film, a second adhesive film, and a glass sheet; the backboard, the first adhesive film, the solar cell interconnection structure, the second adhesive film and the glass plate are sequentially connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321576691.0U CN220172148U (en) | 2023-06-20 | 2023-06-20 | Solar cell interconnection structure and solar cell module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321576691.0U CN220172148U (en) | 2023-06-20 | 2023-06-20 | Solar cell interconnection structure and solar cell module |
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| Publication Number | Publication Date |
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| CN220172148U true CN220172148U (en) | 2023-12-12 |
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| CN202321576691.0U Active CN220172148U (en) | 2023-06-20 | 2023-06-20 | Solar cell interconnection structure and solar cell module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220172148U (en) |
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2023
- 2023-06-20 CN CN202321576691.0U patent/CN220172148U/en active Active
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