CN215869422U - Connector, solar cell string and solar cell module - Google Patents
Connector, solar cell string and solar cell module Download PDFInfo
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- CN215869422U CN215869422U CN202122384073.3U CN202122384073U CN215869422U CN 215869422 U CN215869422 U CN 215869422U CN 202122384073 U CN202122384073 U CN 202122384073U CN 215869422 U CN215869422 U CN 215869422U
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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
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model is suitable for the technical field of solar cells and provides a connector, a solar cell string and a solar cell module, wherein the connector is used for the solar cell string and comprises a water-blocking film; and the conductive piece is fixedly arranged on the water-resisting film and is of an integrated structure formed by winding a tinned metal wire or a nickel-plated metal wire, and the conductive piece comprises a plurality of sections of conductive bodies which are sequentially arranged at intervals and connected with each other. The connector provided by the utility model can replace the traditional welding strip, and a welding process is not involved when the solar cell string adopts the connector to interconnect the cell units, so that the problems that the cell units are warped due to welding and the performance of the cell units is influenced by high welding temperature are avoided; moreover, the water-blocking film of the connector can effectively prevent the battery unit from being influenced by water vapor, so that the ageing resistance of the battery unit is higher, and the service life of the battery unit is longer.
Description
Technical Field
The utility model relates to the technical field of solar cells, in particular to a connecting body, a solar cell string and a solar cell module.
Background
With the continuous development of the current industrial technology, the productivity of each industry is continuously increased, and meanwhile, the energy consumption is also increased. At present, the main energy of the society is still the traditional non-renewable energy, the reserve of the non-renewable energy is continuously reduced, and meanwhile, the consumption of the non-renewable energy also causes serious influence on the environment, so that the photovoltaic industry is fully developed. How to improve the quality of the solar cell has become the current key development direction of the photovoltaic industry.
In the prior art, solar cells need to be interconnected and connected in series to form a solar cell string, and the solar cell string is connected through a bus bar to form a solar cell module. The solar cell is usually welded into a cell string by adopting a welding strip, the welding strip and the cell are easily warped to affect the quality of the cell, the performance of the cell is affected by high temperature generated by welding, and particularly for the perovskite laminated cell, the perovskite film layer is damaged by high temperature in the welding process, so that the performance of the cell is affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a connector, and aims to solve the problems that solar cells in the prior art are welded into a solar cell string by adopting a welding strip, the cells are easy to warp, and the performance of the cells is influenced.
The present invention is achieved by providing a connecting body for a solar cell string, including:
a water-resistant film; and
the conductive piece is fixedly arranged on the water-resistant film and is of an integrated structure formed by winding a tinned metal wire or a nickel-plated metal wire, and the conductive piece comprises a plurality of sections of conductive bodies which are sequentially arranged at intervals and connected with each other.
Preferably, the conductive member is fixed to the water blocking film by thermal bonding.
Preferably, the plurality of sections of the electric conductors are sequentially arranged in parallel at intervals along the length direction of the water-blocking film.
Preferably, the diameter of the tin-plated metal wire or the nickel-plated metal wire is 78-80 μm, and the distance between two adjacent sections of the electric conductor is 4.8-5.2 mm.
The present invention also provides a solar cell string, comprising:
and two adjacent battery units are connected through the connector, one end of the connector is laminated on the front electrode of one battery unit, and the other end of the connector is laminated on the back electrode of the other battery unit.
Preferably, the battery unit includes a bottom battery, a top battery disposed above the bottom battery, and an intermediate series layer connecting the bottom battery and the top battery, the back surface of the bottom battery is provided with the back surface electrode, and the front surface of the top battery is provided with the front surface electrode; the top cell is a perovskite cell, and the bottom cell is a crystalline silicon cell or a thin film cell.
Preferably, the bottom cell is a crystalline silicon cell, and the back electrode comprises a plurality of low-temperature silver paste grid lines.
The utility model also provides a solar cell module which comprises the solar cell string.
The connecting body provided by the utility model comprises a water-resisting film and a conductive piece which is fixedly arranged on the water-resisting film and is formed by winding a tinned metal wire or a nickel-plated metal wire, the interconnection among the battery units is realized by utilizing the connecting body, the battery units of the solar battery string are interconnected by adopting the connecting body to replace a traditional welding strip, the connecting body is connected with the front electrode and the back electrode of the battery units in a laminating mode so as to realize the interconnection among the battery units, and the connecting body does not relate to a welding process when interconnecting the battery units, so that the problem that the battery units have warpage and high temperature influence on the performance of the battery due to welding is solved, and the reliability of the battery units is improved; moreover, the water-blocking film of the connector can effectively prevent the battery unit from being influenced by water vapor, so that the ageing resistance of the battery unit is higher, the service life of the battery unit is longer, and further, the solar battery assembly formed by the solar battery strings has better performance and longer service life.
Drawings
Fig. 1 is a schematic structural diagram of a solar cell string according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a connector according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a connector according to an embodiment of the present invention connected to a front electrode of a battery cell;
fig. 4 is a schematic diagram of a connector connected to a back electrode of a battery cell according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery unit of a solar battery string according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a process for manufacturing a connecting body according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The connecting body comprises a water-resistant film and a conductive piece which is fixedly arranged on the water-resistant film and is formed by winding a tinned metal wire or a nickel-plated metal wire, the connecting body can be connected with the front electrode and the back electrode of the battery unit in a laminating mode to realize interconnection between the battery units, and the battery units of the solar battery string are interconnected by adopting the connecting body to replace a traditional welding strip. Because the connector does not involve a welding process when interconnecting the battery units, the problems that the battery units are warped due to welding and the performance of the battery is influenced by high welding temperature are avoided; moreover, the water-blocking film of the connector can effectively prevent the battery unit from being influenced by water vapor, so that the ageing resistance of the battery unit is higher, the service life of the battery unit is longer, and further, the solar battery assembly formed by the solar battery strings has better performance and longer service life.
Referring to fig. 1 to 4, the present invention provides a solar cell string, which includes at least two cell units 1, wherein two adjacent cell units 1 are interconnected through a connector 2; the connecting body 2 comprises a water-resistant film 21; the conductive piece 22 is fixedly arranged on the water-resisting film 21 and is formed by winding a tinned metal wire or a nickel-plated metal wire into an integral structure, and the conductive piece 22 comprises a plurality of sections of conductive bodies 221 which are sequentially arranged at intervals and connected with each other; one end of the connector 2 is laminated to the front electrode 10 of one battery cell 1, and the other end of the connector 2 is laminated to the rear electrode 11 of another battery cell 1.
In the embodiment of the present invention, the specific number of the battery units 1 may be set according to actual needs. The battery cell 1 may be a crystalline silicon battery, a thin film battery, or a perovskite battery. The specific structure of the front electrode 10 and the back electrode 11 of the battery cell 1 is not limited, and the front electrode 10 and the back electrode 11 may be a grid line or a conductive thin film.
For example, when the battery unit 1 is a PERC crystal silicon battery, the solar battery string is formed by connecting at least two PERC crystal silicon batteries in series. In two adjacent PERC crystal silicon cells of the solar cell string, one end of the connecting body 2 is laminated on the front electrode 10 of one PERC crystal silicon cell, so that the connecting body 2 is in electric contact with the front electrode 10 of the PERC crystal silicon cell, and the other end of the connecting body 2 is laminated on the back electrode 11 of the other PERC crystal silicon cell, so that the connecting body 2 is in electric contact with the back electrode of the PERC crystal silicon cell, and therefore interconnection between the two adjacent PERC crystal silicon cells is achieved.
When the battery unit 1 is a perovskite battery, the solar battery string is formed by connecting at least two perovskite batteries in series. In two adjacent perovskite cells of the solar cell string, one end of the connector 2 is laminated on the front electrode of one perovskite cell, so that the connector 2 is in electrical contact with the front electrode of the perovskite cell; the other end of the connector 2 is laminated to the back electrode of another perovskite cell so that the connector 2 is in electrical contact with the back electrode of the perovskite cell, thereby realizing interconnection between two adjacent perovskite cells.
In the embodiment of the present invention, when two adjacent battery units 1 of the solar battery string are interconnected through the connecting body 2, one end of the connecting body 2 is laminated on the front electrode 10 of one battery unit 1, so that the multiple sections of conductors 221 of the conductive member 22 of the connecting body 2 are respectively in electrical contact with the front electrode 10 of one battery unit 1, and the other end of the connecting body 2 is laminated on the back electrode 11 of another battery unit 1, so that the multiple sections of conductors 221 of the conductive member 22 of the connecting body 2 are respectively in electrical contact with the back electrode 11 of another battery unit 1, thereby implementing serial interconnection of two adjacent battery units 1. Because the connector does not need a welding process when the battery units 1 are interconnected, the problems that the battery units 1 are warped due to welding and the performance of the battery units 1 is influenced by high welding temperature are avoided; moreover, the water blocking film 21 of the connector 2 can effectively prevent the battery unit 1 from being affected by water vapor, so that the aging resistance of the battery unit 1 is higher, and the service life of the battery unit 1 is longer.
Referring to fig. 5, as an embodiment of the present invention, a battery unit 1 includes a bottom battery 12, a top battery 13 disposed on the bottom battery 12, and an intermediate series layer 14 connecting the bottom battery 12 and the top battery 13, wherein a back surface of the bottom battery 12 is provided with a back electrode 11, and a front surface of the top battery 13 is provided with a front electrode 10; the top cell 13 is a perovskite cell and the bottom cell 12 is a crystalline silicon cell or a thin film cell.
In this embodiment, the top cell 13 is a perovskite cell, the bottom cell 12 is a crystalline silicon cell or a thin film cell, that is, the cell unit 1 is a perovskite tandem cell composed of the bottom cell 12 and the top cell 13, so that the perovskite cell using a wide band gap of 1.50-1.75eV as the top cell can absorb sunlight of a short wavelength part, and the crystalline silicon cell using a narrow band gap of 1.12eV as the bottom cell can absorb sunlight of a long wavelength part, thereby improving the utilization rate of the solar spectrum, reducing the thermal relaxation loss of carriers in a single junction cell, and improving the photoelectric conversion efficiency. The perovskite cell, the crystalline silicon cell or the thin film cell are conventional cells in the prior art, and therefore the structures of the perovskite cell, the crystalline silicon cell or the thin film cell are not described in detail herein.
Referring to fig. 4 again, as an embodiment of the present invention, the bottom cell 12 is a crystalline silicon cell, and the back electrode 11 includes a plurality of low temperature silver paste grid lines, i.e. the back electrode 11 of the bottom cell 12 is composed of low temperature silver paste grid lines. Wherein the specific sintering temperature of the low-temperature silver paste is 130-180 ℃; a plurality of low-temperature silver paste grid lines are sequentially arranged on the back of the bottom battery 12 in parallel at equal intervals. By utilizing the characteristic that low-temperature silver paste can be melted under the low-temperature condition, the heat generated in the laminating process of the connector 2 and the back electrode 11 of the bottom battery 12 can melt the low-temperature silver paste, the low-temperature silver paste is connected with the conductive piece 22 of the connector 2 and forms ohmic contact, the contact resistance of the connector 2 and the battery unit 1 can be reduced, the series resistance of the solar battery string can be reduced, and the battery conversion efficiency is improved.
In the embodiment of the present invention, the water-blocking film 21 is a 3M water-blocking film. Wherein, because the polymer of 3M water-blocking film blocks water the rete and scribbles the fluorine membrane layer, can make water-blocking film 21 prevent effectively that battery unit 1 from receiving the influence of steam like this for battery unit 1 ageing resistance is higher, and battery unit 1 life is longer. The water-blocking film 21 may be a silicon nitride film or an aluminum oxide film.
In the embodiment of the present invention, the conductive member 22 is disposed on the water-blocking film 21 in a flat manner, and the conductive member 22 and the water-blocking film 21 are fixed to form a whole.
In an embodiment of the present invention, the conductive member 22 is fixed to the water blocking film 21 by thermal bonding. The conductive member 22 is fixed on the water-blocking film 21 by thermal adhesion, so that the conductive member 22 forms an integrated structure, and the conductive member 22 and the water-blocking film 21 are firmly fixed, and the fixing method is simple.
In this embodiment, when manufacturing the conductive device 22, the conductive device 22 is placed on the water blocking film 21, and then current is applied to both ends of the conductive device 22 to heat the conductive device 22, so that the contact position of the water blocking film 21 and the conductive device 22 is melted or part of the surface of the conductive device 22 is melted, the conductive device 22 is thermally adhered to the water blocking film 21, the conductive device 22 and the water blocking film 21 can be fixed into a whole after cooling, and the fixing manner of the conductive device 22 and the water blocking film 21 is simple and convenient.
In one embodiment of the present invention, the plurality of conductive bodies 221 are sequentially arranged in parallel at intervals along the longitudinal direction of the water blocking film 21. Each of the conductors 221 has a linear shape. The conductive member 22 is in uniform contact with the front electrode 10 or the back electrode 11 of the battery unit 1 by using the plurality of sections of conductive members 221 sequentially arranged in parallel at intervals along the length direction of the water blocking film 21, so that the conductive member 22 and the battery unit 1 have better conductivity, and the conductive member 22 is convenient to manufacture. Preferably, the plurality of conductors 221 are sequentially provided at equal intervals in parallel along the longitudinal direction of the water blocking film 21. In addition to this embodiment, the multi-stage conductor 221 may have another shape, and the multi-stage conductor 221 may be provided in a non-parallel manner.
In the embodiment of the utility model, because the conductive piece 22 is formed by winding a tinned metal wire or a nickel-plated metal wire, compared with the conductive piece formed by a plurality of metal wires, the conductive piece 22 has no contact point between the metal wires, adopts a tinned metal wire or a nickel-plated metal wire for conducting, has better conductivity, can directly wind a tinned metal wire or a nickel-plated metal wire into the conductive piece 22 with an integrated structure, has simpler structure and is simpler and more convenient to process. The tin on the surface of the tin-plated wire or the nickel on the surface of the nickel-plated wire is melted to thermally bond the wire and the water-blocking film 21 together.
Referring to fig. 6, in the present embodiment, when manufacturing the connector 2, a tin-plated metal wire or a nickel-plated metal wire is sequentially wound on each winding post 200, and the distance between two adjacent winding posts 200 is the diameter of a single winding post, so as to obtain a conductive member 22 composed of multiple sections of conductive bodies 221; then, the conductive device 22 is placed on the water blocking film 21 so that the water blocking film 21 is in close contact with the tin-plated metal wire or the nickel-plated metal wire, and then current is introduced to two ends of the tin-plated metal wire or the nickel-plated metal wire to electrify the tin-plated metal wire or the nickel-plated metal wire to generate heat so that tin or nickel on the surface of the metal wire is melted, and the metal wire and the water blocking film 21 can be thermally bonded into a whole; meanwhile, a Teflon roller is used for rolling on the metal wire, so that the metal wire and the water blocking film 21 are tightly adhered and fixed, and the connector 2 consisting of the metal wire and the water blocking film 21 is formed.
As an embodiment of the present invention, the diameter of the tin-plated wire or the nickel-plated wire is 78-80 μm, and the distance b between two adjacent segments of the conductor 221 is 4.8-5.2 mm. On one hand, the diameter of the tin-plated metal wire or the nickel-plated metal wire is controlled to be 78-80 μm, so that the shading influence of the connector 2 on the battery unit 1 can be reduced to the maximum extent, the conversion efficiency of the battery unit 1 is improved to a certain extent, and the conductive effect of the metal wire is ensured; on the other hand, the distance b between two adjacent conductive bodies 221 is controlled to be 4.8-5.2mm, so that the conductive piece 22 can be ensured to be fully contacted with the front electrode 10 or the back electrode 11 of the battery unit 1, the light shielding area of the connecting body 2 to the battery unit 1 can be reduced, and the battery conversion efficiency can be improved.
The utility model also provides a solar cell module which comprises the solar cell string. The solar cell strings of the solar cell module are connected end to end through the bus bars to form the solar cell module. Because the connecting body 2 is adopted to replace the traditional welding strip to interconnect the battery units 1 of each solar battery string of the solar battery assembly, the connecting body 2 does not relate to a welding process when the battery units 1 are interconnected, and the battery units 1 cannot have the problems of warping phenomenon caused by welding and influence on the performance of the battery units 1 due to high temperature; moreover, the water blocking film 21 of the connector 2 can effectively prevent the battery unit 1 from being affected by water vapor, so that the aging resistance of the battery unit 1 is higher, the service life of the battery unit 1 is longer, and the service life of the solar battery assembly is longer.
The solar cell string provided by the embodiment of the utility model has the advantages that two adjacent cell units are connected through the connecting body, the connecting body comprises a water-blocking film and a conductive piece fixedly arranged on the water-blocking film, the connecting body can be connected with the front electrode and the back electrode of the cell units in a laminating mode to realize interconnection of the cell units, and the cell units of the solar cell string are interconnected by adopting the connecting body to replace the traditional welding strip. Because the connector does not involve a welding process when interconnecting the battery units, the problems that the battery units are warped due to welding and the performance of the battery is influenced by high welding temperature are avoided; moreover, the water-blocking film of the connector can effectively prevent the battery unit from being influenced by water vapor, so that the ageing resistance of the battery unit is higher, the service life of the battery unit is longer, and further, the solar battery assembly formed by the solar battery strings has better performance and longer service life.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A connector for a solar cell string, comprising:
a water-resistant film; and
the conductive piece is fixedly arranged on the water-resistant film and is of an integrated structure formed by winding a tinned metal wire or a nickel-plated metal wire, and the conductive piece comprises a plurality of sections of conductive bodies which are sequentially arranged at intervals and connected with each other.
2. The connector of claim 1, wherein the conductive member is fixed to the water-blocking film by thermal bonding.
3. The connector of claim 1, wherein a plurality of the conductive bodies are sequentially arranged in parallel along a length direction of the water-resistant film.
4. The interconnect of claim 1, wherein the diameter of said tin plated wire or said nickel plated wire is 78-80 μm, and the distance between two adjacent segments of said electrical conductor is 4.8-5.2 mm.
5. A solar cell string, comprising:
at least two battery cells, adjacent two of said battery cells being connected by a connector according to any one of claims 1 to 4, one end of said connector being laminated to the front electrode of one of said battery cells and the other end of said connector being laminated to the back electrode of the other of said battery cells.
6. The string of solar cells of claim 5, wherein the cell unit comprises a bottom cell, a top cell disposed over the bottom cell, and an intermediate series layer connecting the bottom cell and the top cell, wherein the back side of the bottom cell is provided with the back side electrode, and the front side of the top cell is provided with the front side electrode; the top cell is a perovskite cell, and the bottom cell is a crystalline silicon cell or a thin film cell.
7. The solar cell string according to claim 6, wherein the bottom cell is a crystalline silicon cell and the back electrode comprises a plurality of low temperature silver paste grid lines.
8. A solar cell module comprising the solar cell string according to any one of claims 5 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122384073.3U CN215869422U (en) | 2021-09-28 | 2021-09-28 | Connector, solar cell string and solar cell module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122384073.3U CN215869422U (en) | 2021-09-28 | 2021-09-28 | Connector, solar cell string and solar cell module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215869422U true CN215869422U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122384073.3U Active CN215869422U (en) | 2021-09-28 | 2021-09-28 | Connector, solar cell string and solar cell module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215869422U (en) |
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2021
- 2021-09-28 CN CN202122384073.3U patent/CN215869422U/en active Active
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