CN213782025U - Current leading-out structure of solar cell and solar cell - Google Patents
Current leading-out structure of solar cell and solar cell Download PDFInfo
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- CN213782025U CN213782025U CN202120121966.6U CN202120121966U CN213782025U CN 213782025 U CN213782025 U CN 213782025U CN 202120121966 U CN202120121966 U CN 202120121966U CN 213782025 U CN213782025 U CN 213782025U
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- Prior art keywords
- solar cell
- conductor
- current
- out structure
- current lead
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- 210000004027 cell Anatomy 0.000 claims abstract description 88
- 239000004020 conductor Substances 0.000 claims abstract description 75
- 238000009795 derivation Methods 0.000 claims abstract description 18
- 210000005056 cell body Anatomy 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000007645 offset printing Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 30
- 229910052709 silver Inorganic materials 0.000 abstract description 30
- 239000004332 silver Substances 0.000 abstract description 30
- 238000003466 welding Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000003854 Surface Print Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 229910000679 solder Inorganic materials 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
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
- Y02E10/52—PV systems with concentrators
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- Photovoltaic Devices (AREA)
Abstract
The utility model relates to a solar cell technical field provides a solar cell's electric current derivation structure and solar cell, and this solar cell's electric current derivation structure includes: the conductor is in a grid structure, is suitable for being connected to the surface of a cell body of the solar cell and is used for leading out current; and the bus end is connected to the edge of the conductor and used for leading out the current of the conductor. The utility model provides a solar cell's electric current derivation structure has latticed structure's conductor, connects behind solar cell's surface, can draw solar surface current everywhere, then realizes through the end that converges that sets up at the conductor edge that the electric current converges and outwards draws. So set up, need not at solar cell's surface printing silver thick liquid grid line, reduce the manufacturing cost of solar cell on the silver thick liquid. Moreover, welding strips do not need to be welded on the silver paste grid lines, the process flow is simple, the problem of deviation when the welding strips are overlapped with the silver paste grid lines is avoided, and the production yield of the solar cell is higher.
Description
Technical Field
The utility model relates to a solar cell technical field, concretely relates to solar cell's electric current derivation structure and solar cell.
Background
The solar cell is a semiconductor device for converting solar energy into electric energy, and enables illumination to generate potential difference between different parts of uneven semiconductors or combination of the semiconductors and metals through a photovoltaic effect, and the potential difference is led out through a current leading-out structure, so that the utilization of the electric energy is realized. Fig. 1 is a schematic structural diagram of a current lead-out structure of a solar cell in the prior art. As shown in fig. 1, the current of the current battery piece is led out through a grid silver paste grid line 1 printed on the surface of the battery, and a linear metal welding strip 2 is welded on the silver paste grid line 1, a plurality of silver paste supporting grid lines arranged along the horizontal direction at parallel intervals, a silver paste main grid line arranged along the vertical direction at parallel intervals and a welding strip superposed with the silver paste main grid line are welded on the surface of the battery, the current at each position on the surface of the battery is transmitted to each silver paste main grid line through the silver paste supporting grid lines, and then the current is led out through the welding strip connected with each silver paste main grid line.
However, the structural design has the problems of high silver paste consumption and high battery production cost; moreover, when the solder strip is welded with the silver paste main grid line, the process precision requirement is high, the difficulty of welding the solder strip is high, and once the solder strip is deviated from the silver paste main grid line, the current derivation effect can be reduced, and the absorption efficiency of the battery for reducing light can be shielded. In addition, the adhesion between the solder strip and the main grid line of the silver paste is unstable due to the influence of the quality of the welding process, so that the solder strip is easy to fall off, and the quality of the battery is reduced.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the grid silver thick liquid grid line of printing on the battery surface among the prior art defect with high costs, the result of use is poor to a solar cell's electric current derivation structure and solar cell are provided.
In order to solve the technical problem, the technical scheme of the utility model as follows:
a current derivation structure for a solar cell, comprising: the conductor is in a grid structure, is suitable for being connected to the surface of a cell body of the solar cell and is used for leading out current on the surface of the cell body; and the bus end is connected to the edge of the conductor and used for leading out the current of the conductor.
Furthermore, the conductor is of a grid-shaped structure formed by a plurality of metal wires in a staggered arrangement, and the cross section of each metal wire is triangular or trapezoidal.
Furthermore, the cross section of the metal wire is in the shape of an equilateral triangle, and the side length range of the equilateral triangle is 0.10-0.20 mm.
Further, the shape of the mesh of the conductor includes one or more of a rectangle, a triangle, a polygon, and a curved pattern.
Further, the shape of the mesh of the conductor is square, and the side length of the mesh ranges from 8mm to 12 mm.
Furthermore, the plurality of the current converging ends are arranged at intervals on one side edge of the conductor.
Further, the conductor and the bus end are of an integrally formed structure.
Further, the metal wire is formed by copper-containing materials, and the copper-containing materials comprise copper-tin alloy.
Further, the conductor is manufactured by a rolling die or a punching die.
Further, the current derivation structure includes one or more grid-shaped conductors; when the current leading-out structure comprises a plurality of conductors, adjacent conductors are connected through a junction on one of the conductors.
A solar cell comprises a cell body and a current leading-out structure of the solar cell connected to the surface of the cell body.
Further, the current lead-out structure has a conductive offset printing surface bonded on the surface of the battery body by a conductive adhesive.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a solar cell's electric current derivation structure has latticed structure's conductor, connects behind solar cell's surface, can draw solar surface current everywhere, then realizes through the end that converges that sets up at the conductor edge that the electric current converges and outwards draws. So set up, need not at solar cell's surface printing silver thick liquid grid line, reduced the manufacturing cost of solar cell on the silver thick liquid. In addition, welding strips do not need to be welded on the silver paste grid lines, the process flow is simple, the problem of deviation when the welding strips are overlapped with the silver paste grid lines is avoided, and the production yield of the solar cell is higher.
2. The utility model provides a structure is derived to solar cell's electric current, the shape of the cross section of wire be triangle-shaped or trapezoidal, can increase conductor and solar cell's bonding area, improves adhesive force between the two, and is electrically conductive more stable. Moreover, the triangular or trapezoidal inclined plane can increase the reflection of light, which is beneficial to improving the photoelectric conversion efficiency of the solar cell.
3. The utility model provides a solar cell's electric current derivation structure, conductor and collection flow end are integrated into one piece structure, and technology is simpler, is favorable to reduction in production cost.
4. The utility model provides a structure is derived to solar cell's electric current, the conductor is direct to be connected on solar cell's surface through electrically conductive bonding, and conductor adhesive force is stronger, and is electrically conductive more stable. Moreover, the curing temperature of the conductive adhesive is low (60-150 ℃), and the damage of high temperature (more than 200 ℃) to the solar cell film layer can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a current derivation structure of a solar cell in the prior art;
fig. 2 is a schematic structural diagram of a current derivation structure of a solar cell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a solar cell neutron cell according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a solar cell according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a metal wire in a current-drawing structure of a solar cell according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a metal wire in a current lead-out structure of a solar cell according to another embodiment of the present invention;
fig. 7 is a front view of a current derivation structure of a solar cell according to an embodiment of the present invention;
fig. 8 is a partially enlarged view of fig. 7.
Description of reference numerals:
1. silver paste grid lines; 2. Welding a strip; 3. A sub-battery;
4. a conductor; 5. A sink end; 6. A wire.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 2 is a schematic structural diagram of a current derivation structure of a solar cell according to an embodiment of the present invention. As shown in fig. 2, the present embodiment provides a current lead-out structure of a solar cell, including: the conductor 4 is in a grid structure, is suitable for being connected to the surface of the solar cell and is used for leading out current on the surface of the solar cell; and the bus end 5 is connected to the edge of the conductor 4 and is used for leading out the current of the conductor 4.
The utility model provides a structure is derived to solar cell's electric current has latticed structure's conductor 4, connects behind solar cell's battery body's surface, can draw out battery body surface current everywhere, then realizes the electric current through setting up at 4 marginal converge terminals 5 of conductor that converge and outwards draw out. The conductor 4 may be made by a rolling die or a punching die. So set up, need not at solar cell's surface printing silver thick liquid grid line, reduced the manufacturing cost of solar cell on the silver thick liquid. In addition, welding strips do not need to be welded on the silver paste grid lines, the process flow is simple, the problem of deviation when the welding strips are overlapped with the silver paste grid lines is avoided, and the production yield of the solar cell is higher.
Fig. 5 is a schematic cross-sectional view of a metal wire in a current-drawing structure of a solar cell according to an embodiment of the present invention; fig. 6 is a schematic cross-sectional view of a metal wire in a current lead-out structure of a solar cell according to another embodiment of the present invention. As shown in fig. 5 and 6, for example, the conductor 4 may be a grid structure formed by a plurality of wires 6 arranged in a staggered manner, and the cross section of each wire 6 has a triangular or trapezoidal shape.
Preferably, the cross-section of the wire 6 is in the shape of an equilateral triangle, the side length of which is in the range of 0.10 to 0.20 mm. For example, the side length is 0.15 mm.
For example, the wire 6 is formed using a copper-containing material including a copper-tin alloy.
Wherein the shape of the mesh of the conductor 4 includes one or more of a rectangle, a triangle, a polygon, and a curved pattern. Preferably, the meshes of the conductor 4 are square with side lengths in the range of 8-12 mm. For example, the side length of the mesh of the conductor 4 is 8.485 mm.
For example, chamfers may be provided at the upper and lower left corners of the conductor 4, the size of the chamfers corresponding to the size of the chamfers on the solar cell. For example, the chamfer may range in length from 8 to 12mm and in width from 8 to 12 mm.
The plurality of bus terminals 5 are provided at intervals on one side edge of the conductor 4. For example, the plurality of bus ends 5 are equally spaced in the longitudinal direction of the conductor 4, and the spacing between two adjacent bus ends 5 may be 18 mm. The width of the bus end 5 may range from 2 to 6 mm.
Wherein, the conductor 4 and the bus bar terminal 5 are of an integrated structure.
Wherein the current derivation structure includes one or more grid-shaped conductors 4; when the current lead-out structure comprises a plurality of conductors 4, adjacent conductors 4 are connected by a bus terminal 5 on one of the conductors 4.
For example, the current lead-out structure may include two conductors 4, the two conductors 4 being arranged in the transverse direction and connected by a bus bar terminal 5 therebetween.
Fig. 7 is a front view of a current lead-out structure of a solar cell according to an embodiment of the present invention. Fig. 8 is a partial enlarged view of fig. 7, and as shown in fig. 7 and 8, for example, the length of each conductor 4 may be 100-200 mm, and the width may be 50-100 mm. For example, the two conductors 4 may be located in different horizontal planes, for example, the left conductor 4 is located on a higher plane than the right conductor 4, and the difference in height between the two conductors 4 in the vertical plane may be equal to the thickness of the solar cell. When the solar cell module is used, the bottom surface of the conductor 4 on the left side is bonded with the solar cell, the top surface of the conductor 4 on the right side is bonded with the solar cell, so that the solar cells bonded on the left conductor 4 and the right conductor 4 are positioned on the same plane, and the improvement of the integral flatness is facilitated.
Fig. 3 is a schematic structural diagram of a solar cell neutron cell according to an embodiment of the present invention. As shown in fig. 3, each conductor 4 corresponds to one sub-cell 3, and the actual number of conductors 4 can be designed according to the number requirement of the sub-cells 3, for example, in a solar cell of a specification, twelve sub-cells 3 arranged in the transverse direction and six longitudinal sub-cells 3 arranged in the longitudinal direction can be included, and correspondingly, there are twelve conductors 4 in the transverse direction and six conductors 4 in the longitudinal direction. The solar cell may particularly preferably be a heterojunction solar cell.
In practical applications, the conductors 4 of the grid-like structure may be made by roll-forming or punching. The wire 6 is formed of a copper-containing material, including a copper-tin alloy.
Fig. 4 is a schematic structural diagram of a solar cell according to an embodiment of the present invention; as shown in fig. 4, a solar cell includes a cell body and a current lead-out structure of the solar cell connected to a surface of the cell body.
The current leading-out structure is provided with a conductive offset printing surface, and the conductive offset printing surface is adhered to the surface of the solar cell body through conductive glue. The conductor 4 of the grid-like structure is overlapped with the battery body, and then the conductive paste between the conductor 4 and the battery body is cured by a heating device. The curing temperature range of the conductive adhesive is 60-150 ℃, and the damage to a film layer of the solar cell caused by overhigh temperature can be avoided. For example, the spacing between the bonded solar cell and the edge of the conductor 4 may be 1-2 mm.
The utility model provides a current derivation structure of solar cell, which can realize zero consumption of silver paste and reduce the production cost of solar cell on silver paste; the process defect of offset when the welding strip is overlapped with the silver paste grid line can be avoided, the conductor 4 is bonded with the solar cell through the conductive adhesive, and the adhesive force is stronger than that of the welding strip and the silver paste; the cross section of the metal wire 6 is triangular, so that light reflection can be increased, and the conversion efficiency of the solar cell is improved; the curing temperature of the conductive adhesive is low, and the damage of high temperature to a film layer of the solar cell is avoided.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A current lead-out structure of a solar cell, comprising:
the conductor (4) is of a grid-shaped structure, is suitable for being connected to the surface of a cell body of the solar cell and is used for leading out current on the surface of the cell body;
and the bus end (5) is connected to the edge of the conductor (4) and is used for leading out the current of the conductor (4).
2. The current lead-out structure of a solar cell according to claim 1,
the conductor (4) is of a grid structure formed by a plurality of metal wires (6) in a staggered mode, and the cross section of each metal wire (6) is triangular or trapezoidal.
3. The current lead-out structure of a solar cell according to claim 1,
the wire (6) is formed from a copper-containing material comprising a copper-tin alloy.
4. The current lead-out structure of a solar cell according to claim 1,
the shape of the mesh of the conductor (4) comprises one or more of a rectangle, a triangle, a polygon and a curved pattern.
5. The current lead-out structure of a solar cell according to claim 1,
the conductor (4) is manufactured by a rolling die or a punching die.
6. The solar cell current lead-out structure according to any one of claims 1 to 5,
the plurality of the confluence ends (5) are arranged at the edge of one side of the conductor (4) at intervals.
7. The solar cell current lead-out structure according to any one of claims 1 to 5,
the conductor (4) and the bus end (5) are of an integrally formed structure.
8. The solar cell current lead-out structure according to any one of claims 1 to 5,
the current derivation structure comprises one or more grid-shaped conductors (4);
when the current leading-out structure comprises a plurality of conductors (4), adjacent conductors (4) are connected through a junction (5) on one conductor (4).
9. A solar cell comprising a cell body and a current lead-out structure connected to a surface of the cell body, wherein the current lead-out structure is the current lead-out structure of the solar cell according to any one of claims 1 to 8.
10. The solar cell of claim 9,
the current derivation structure has a conductive offset printing surface which is bonded on the surface of the battery body by a conductive adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120121966.6U CN213782025U (en) | 2021-01-15 | 2021-01-15 | Current leading-out structure of solar cell and solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120121966.6U CN213782025U (en) | 2021-01-15 | 2021-01-15 | Current leading-out structure of solar cell and solar cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213782025U true CN213782025U (en) | 2021-07-23 |
Family
ID=76901780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120121966.6U Expired - Fee Related CN213782025U (en) | 2021-01-15 | 2021-01-15 | Current leading-out structure of solar cell and solar cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213782025U (en) |
-
2021
- 2021-01-15 CN CN202120121966.6U patent/CN213782025U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210723 |