CN112510099B - Solar cell module, solar cell and manufacturing method thereof - Google Patents
Solar cell module, solar cell and manufacturing method thereof Download PDFInfo
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- CN112510099B CN112510099B CN202011378236.0A CN202011378236A CN112510099B CN 112510099 B CN112510099 B CN 112510099B CN 202011378236 A CN202011378236 A CN 202011378236A CN 112510099 B CN112510099 B CN 112510099B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims description 20
- 238000007689 inspection Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 18
- 238000002161 passivation Methods 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000007650 screen-printing Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000000969 carrier Substances 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 238000005215 recombination Methods 0.000 description 3
- 230000006798 recombination Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910020776 SixNy Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000231 atomic layer deposition Methods 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The embodiment of the invention provides a solar cell module, a solar cell and a manufacturing method of the solar cell. The solar cell sheet includes: the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves; the laser lines are arranged in the extending direction vertical to the laser lines; each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side; wherein, the laser lines comprise at least one marked laser line and at least one unmarked laser line; the first end of the marked laser line is not flush with the first end of the unmarked laser line; or the second end of the marked laser line is not flush with the second end of the unmarked laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line. In the embodiment of the invention, the corresponding laser grooving equipment can be tracked through the marking laser line on the solar cell.
Description
Technical Field
The embodiment of the invention relates to the field of solar energy, in particular to a solar cell module, a solar cell and a manufacturing method thereof.
Background
The solar cell is used for directly converting solar light energy into electric energy. Among the numerous solar cells, a Passivated emitter and back Cell (PERC) has become a mainstream solar Cell due to its technical and cost advantages, and its productivity has rapidly expanded in recent years. The core of the PERC cell is to add a full-coverage back passivation film to the conventional solar cell, which can greatly reduce the photoelectric loss, increase the light absorption rate, and significantly reduce the back surface recombination current density. In the selection of the material of the passivation film. Due to the high charge density, the aluminum oxide can provide good passivation for the P-type surface, and is a back passivation material widely applied to the PERC battery piece at present. In addition to aluminum oxide, silicon oxynitride, or the like may be used as the back passivation material. In addition, in order to fully satisfy the back passivation condition, a layer of silicon nitride is coated on the surface of the aluminum oxide to protect the back passivation film and ensure the optical performance of the back of the cell. Two important steps of the production process of the PERC cell plate are increased compared with the conventional solar cell plate, including: a backside passivation layer is deposited and then laser grooved to form backside contacts.
The back laser technology has a great influence on the quality of the PERC cell, and therefore tracking the influence of the back laser technology on the solar cell and the solar module becomes a problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a solar cell, a solar cell module and a manufacturing method of the solar cell, which are used for tracking the influence of a back laser technology on the solar cell and the solar module.
In order to solve the above problem, an embodiment of the present invention provides a solar cell, including: the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves; the laser lines are arranged in the extending direction perpendicular to the laser lines; each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side; wherein the plurality of laser lines comprise at least one marked laser line and at least one unmarked laser line; the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension direction of the laser line is different from the width of the non-marking laser line.
In addition, in the extending direction of the laser lines, the number of the laser grooves of the marked laser lines is larger than that of the laser grooves of the unmarked laser lines.
In addition, in the extending direction of the laser lines, the difference between the number of the laser grooves of the marked laser lines and the number of the laser grooves of the unmarked laser lines is 12-24; or in the extending direction perpendicular to the laser lines, the difference between the number of the laser grooves of the marked laser lines and the number of the laser grooves of the unmarked laser lines is 3-6.
Additionally, the substrate comprises a first region and a second region that are contiguous; part of the laser lines are located in the first area, and the laser lines in the first area comprise at least one marking laser line and at least one non-marking laser line; part of the laser lines are located in the second area, and the laser lines in the second area comprise at least one marking laser line and at least one non-marking laser line; in the first area, a first end of the marking laser line is not flush with a first end of the non-marking laser line, or a second end of the marking laser line is not flush with a second end of the non-marking laser line, or the width of the marking laser line is different from the width of the non-marking laser line; in the second area, the first end of the marking laser line is not flush with the first end of the non-marking laser line, or the second end of the marking laser line is not flush with the second end of the non-marking laser line, or the width of the marking laser line is different from that of the non-marking laser line.
In addition, an electrode is arranged on the laser line; in the extending direction of the laser line, the length of the electrode is the same as that of the laser line.
In addition, the marking laser line comprises a first laser line and a second laser line which are adjacent, the width of the first laser line of the marking laser line is different from that of the non-marking laser line, and the width of the second laser line of the marking laser line is the same as that of the non-marking laser line.
An embodiment of the present invention further provides a solar cell module, including: the arrangement positions of the marking laser lines of the solar cell pieces produced by different laser grooving equipment in the extending direction perpendicular to the laser lines are different.
The embodiment of the invention also provides a manufacturing method of the solar cell, which comprises the following steps: providing a plurality of substrates; providing a plurality of laser grooving devices, and performing laser grooving on the corresponding substrates through the laser grooving devices so as to form a plurality of laser lines on the surface of each substrate, wherein each laser line consists of a plurality of discrete laser grooves; the laser lines comprise at least one marking laser line and at least one non-marking laser line, and the marking laser line is used for marking the corresponding laser grooving equipment; the laser lines are arranged in the extending direction perpendicular to the laser lines; the laser line is provided with a first end and a second end which are opposite, the first end is positioned on the same side, and the second end is positioned on the same side; the arrangement positions of the marking laser lines corresponding to different laser grooving equipment in the extending direction perpendicular to the laser lines are different; the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension direction of the laser line is different from the width of the non-marking laser line.
In addition, after the laser line is formed, the method further comprises the following steps: checking the product quality; if the product quality is not qualified, searching the marking laser line; determining the corresponding laser grooving equipment according to the arrangement position of the marked laser line in the extending direction vertical to the laser line; checking the production condition of the laser line of the laser grooving apparatus.
In addition, before the product quality inspection, the method also comprises the following steps: forming an electrode on the laser line, wherein production equipment of the electrode and the laser grooving equipment are integrated in the same machine; in the process of product quality inspection, the production condition of the production equipment of the electrode is also inspected.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
the solar cell provided by the embodiment of the invention is provided with a marking laser line, and the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line. As such, the marking laser line can be distinguished from the non-marking laser line by the first end, the second end, or the width; furthermore, the marking laser lines of the solar cell pieces produced by different laser grooving equipment can be arranged at different arrangement positions, namely the arrangement positions of the marking laser lines correspond to the laser grooving equipment; for a certain solar cell, because the characteristics of the marked laser line and the unmarked laser line are different, the marked laser line can be quickly found, the laser grooving equipment corresponding to the solar cell is found through the arrangement position of the marked laser line, and the production condition of the laser grooving equipment and the influence of the back laser technology on the solar cell and the solar module are tracked.
In addition, the substrate of the solar cell comprises a first area and a second area which are adjacent, and marking laser lines are arranged in the first area and the second area. If the substrate is subsequently cut to form halves, both halves have marking laser lines by which the corresponding laser grooving apparatus can be tracked. If the cutting is not carried out subsequently, the speed of searching the marking laser lines and tracking the laser grooving equipment can be improved because the number of the marking laser lines on the substrate is large.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, and the drawings are not to scale.
Fig. 1 is a schematic structural diagram of a first solar cell according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second solar cell provided in the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third solar cell provided in the first embodiment of the invention;
fig. 4 is a schematic structural diagram of a fourth solar cell provided in the first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fifth solar cell provided in the first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sixth solar cell provided in the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a seventh solar cell provided in the first embodiment of the present invention;
fig. 8 is a schematic structural diagram of an eighth solar cell provided in the first embodiment of the present invention;
fig. 9 is a schematic structural diagram of a laser groove of a solar cell provided in a first embodiment of the invention;
fig. 10 is a partially enlarged view of a solar cell provided in accordance with a first embodiment of the present invention;
fig. 11 is a schematic structural diagram of a first solar cell according to a second embodiment of the present invention;
fig. 12 is a schematic structural diagram of a second solar cell provided in a second embodiment of the invention;
fig. 13 is a schematic structural diagram of a third solar cell provided in the second embodiment of the invention;
fig. 14 is a schematic structural diagram of a solar cell according to a third embodiment of the invention.
Detailed Description
As can be seen from the background art, the influence of the tracking back laser technology on the solar cell and the solar module is an urgent problem to be solved.
The analysis shows that the main reasons comprise: the laser line formed by the back laser technology has a great influence on the efficiency of the solar cell, because the screen printing is carried out after the laser line is formed, so that electrode slurry is filled in a laser groove of the laser line; after screen printing, sintering is carried out to realize ohmic contact between the electrode and the substrate of the solar cell; that is, the laser groove portion is metallized, and the resistance thereof is much larger than the electrode resistance; since the resistance has a great influence on the efficiency of the solar cell, how to design the slotting rate of the laser line is closely related to the efficiency of the solar cell.
In addition, the yield of the solar cell piece and the subsequent solar cell module under different laser grooving equipment, different laser line patterns and different parameter designs are also closely related.
However, the currently produced solar cell is only distinguished by workshops, and different devices in the workshops are not distinguished; in the finished product quality inspection process, the finished products are classified according to the high-low opening pressure of the efficiency grade and are not distinguished according to specific production equipment; therefore, after the solar cell is delivered from a factory or prepared into a solar photovoltaic module, the laser line for producing the solar cell cannot be accurately positioned and produced by which laser grooving equipment.
Therefore, the influence of the tracking back laser technology on the solar cell and the solar module is a problem to be solved.
In order to solve the above problems, embodiments of the present invention provide a solar cell, where the solar cell has a marked laser line, and a first end of the marked laser line is not flush with a first end of a non-marked laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line. As such, the marking laser line can be distinguished from the non-marking laser line by the first end, the second end, or the width; further, the corresponding relation between the laser grooving equipment and the arrangement position of the marking laser line can be established; for a certain solar cell, because the characteristics of the marked laser line and the unmarked laser line are different, the marked laser line can be quickly found, the laser grooving equipment for producing the solar cell is found through the corresponding relation between the arrangement position of the marked laser line and the laser grooving equipment, and then the production condition of the laser grooving equipment and the influence of the back laser technology on the solar cell and the solar module are tracked.
To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention provides a solar cell, including: the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves; the plurality of laser lines are arranged in the extending direction vertical to the laser lines; each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side; wherein, the laser lines comprise at least one marking laser line and at least one non-marking laser line; the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line. Fig. 1 to fig. 10 are schematic structural diagrams of a solar cell according to a first embodiment of the present invention, and will be described in detail below with reference to the accompanying drawings.
With combined reference to FIGS. 1-9, in the present documentIn an embodiment, the substrate 100 has an edge of about 158.75 cm. The substrate 100 includes a base, an emitter, a passivation layer, and an anti-reflection layer. The material of the substrate is mainly monocrystalline silicon or polycrystalline silicon; the emitter is used for receiving sunlight and generating photon-generated carriers; an anti-reflection layer for reducing reflection of light, thereby increasing sunlight received by the substrate 100; the passivation layer is used for reducing the recombination of current carriers and improving the photoelectric conversion efficiency. In this embodiment, the passivation layer is Al2O3a/SixNy bilayer structure and atomic layer deposition technique to form Al2O3Films and SixNy films.
The surface of the substrate 100 has a number of laser lines 110, each laser line 110 being composed of a number of discrete laser grooves 140. Since the passivation layer has poor conductivity, a laser is used to perform a trench on the passivation layer on the back surface of the substrate 100. The laser groove 140 is formed to penetrate a portion of the passivation layer and expose the substrate, and the subsequently formed electrode is in contact with the substrate through the laser groove 140.
The principle of laser grooving is as follows: after the laser beam with higher energy density irradiates the surface of the passivation layer, the material of the passivation layer absorbs the laser energy, so that the temperature rises, and the melting, ablation and evaporation are generated, thereby achieving the purposes of removing part of the material of the passivation layer and exposing the substrate.
With further reference to fig. 9, fig. 9 is a schematic structural diagram of a laser groove of a solar cell. The laser grooves 140 have a diameter in the range of 37.4 μm to 37.8. mu.m, such as 37.5 μm, 37.6 μm or 37.7. mu.m. If the diameter of the laser trench 140 is too large, more defects may be caused, thereby increasing the carrier recombination degree; if the diameter of the laser groove 140 is too small, the contact resistance between the electrode and the substrate may increase, thereby reducing the conversion efficiency of the solar cell; the diameter of the laser groove 140 is in the range of 37.4 μm to 37.8. mu.m, which can avoid the above two problems.
The spacing between the two laser grooves 140 is in the range of 4.1 μm to 4.3. mu.m, such as 4.2. mu.m. If the distance between the two laser grooves 140 is too small, the laser grooves 140 are easily overlapped with each other, and damage to the base material is increased, thereby reducing the efficiency of the solar cell. If the distance between the two laser grooves 140 is too large, the number of laser grooves 140 is reduced to some extent, and it is difficult for the electrodes to sufficiently collect carriers. The distance between the two laser grooves 140 is in the range of 4.1 μm to 4.3 μm, which can avoid the above two problems.
Referring to fig. 1-8, several laser lines 110 are arranged in a direction perpendicular to the extension of the laser lines 110, i.e. several laser lines 110 are parallel to each other. In this embodiment, the laser line 110 extends in an X-direction, which is parallel to a top edge 150 of the substrate 100.
Each laser line 110 has opposite first and second ends 112, 113, the first ends 112 being on the same side and the second ends 113 being on the same side.
Wherein the plurality of laser lines 110 includes at least one marking laser line 111 and at least one non-marking laser line 116.
In this embodiment, the length of the non-marking laser line 116 is 157 mm.
In this embodiment, a vertical laser line 120 is further provided in a direction perpendicular to the extending direction of the laser line 110 (perpendicular to the X direction), and the vertical laser line 120 connects the marking laser line 111 and the non-marking laser line 116.
The first end 112 of the marking laser line 111 is not flush with the first end 112 of the non-marking laser line 116; or the second end 113 of marking laser line 111 is not flush with the second end 113 of non-marking laser line 116; or the width of the marking laser line 111 in the direction perpendicular to the extending direction of the laser line 110 (the perpendicular direction to the X direction) is different from the width of the non-marking laser line 116. As such, marking laser line 111 can be distinguished from non-marking laser line 116 by first end 112, second end 113, or width; further, a corresponding relationship between the laser grooving equipment and the arrangement position of the marking laser line 111 can be established; for a certain solar cell, because the characteristics of the marked laser line 111 are different from those of the unmarked laser line 116, the marked laser line 111 can be quickly found, and the laser grooving equipment for producing the solar cell is found through the corresponding relation between the arrangement position of the marked laser line 111 and the laser grooving equipment, so that the production condition of the laser grooving equipment is tracked.
Following are several specific examples of marking laser lines 111 and non-marking laser lines 116. It will be appreciated that several examples may be combined with each other.
As an example, referring to fig. 1, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116 and the length of marking laser line 111 is different than the length of non-marking laser line 116. I.e. in the extension direction (X-direction) of the laser line 110, the number of laser grooves of the marking laser line 111 is larger than the number of laser grooves of the non-marking laser line 116. The extra laser groove is located at a first end 112 of the marking laser line 111.
The difference between the number of laser grooves of the marking laser line 111 and the number of laser grooves of the non-marking laser line 116 is in the range of 12 to 24, specifically 15, 18 or 21, that is, the difference between the length of the marking laser line 111 and the length of the non-marking laser line 116 is in the range of 0.5mm to 1 mm. It can be understood that if the difference between the numbers of the laser grooves is larger, more defects are easily caused; if the difference in the number of laser grooves is small, the speed is slow when the marking laser line 111 is distinguished from the non-marking laser line 116. Therefore, the difference between the number of laser grooves of the marking laser line 111 and the number of laser grooves of the non-marking laser line 116 is in the range of 12 to 24, and the above two problems can be avoided.
Second, referring to FIG. 2, second end 113 of marking laser line 111 is not flush with second end 113 of non-marking laser line 116, and the length of marking laser line 111 is greater than the length of non-marking laser line 116. I.e. in the extension direction (X-direction) of the laser line 110, the number of laser grooves of the marking laser line 111 is larger than the number of laser grooves of the non-marking laser line 116. The extra laser groove is located at the second end 113 of the marking laser line 111.
The difference between the number of the marking laser lines 111 and the number of the non-marking laser lines 116 is within a range of 3 to 6, specifically 4 or 5.
Example three, referring to fig. 3, the width of the marking laser line 111 in the direction perpendicular to the extension direction of the laser line 110 (perpendicular direction to the X direction) is different from the width of the non-marking laser line 116.
I.e. in a direction perpendicular to the extension of the laser lines 110 (perpendicular to the X-direction), the number of laser grooves of the marking laser lines 111 differs from the number of laser grooves of the non-marking laser lines 116. And the difference between the number of laser grooves of the marked laser line 111 and the unmarked laser line 116 in the extending direction (perpendicular direction to the X direction) perpendicular to the laser line 110 is 3 to 6. It can be understood that if the difference between the numbers of the laser grooves is larger, more defects are easily caused; if the difference in the number is small, the speed is slow when distinguishing between the marking laser line 111 and the non-marking laser line 116. Therefore, the difference between the number of the marking laser lines 111 and the number of the non-marking laser lines 116 is within a range of 3 to 6, and the above two problems can be avoided.
Example four, referring to FIG. 4, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116, second end 113 of marking laser line 111 is also not flush with second end 113 of non-marking laser line 116, and the length of marking laser line 111 is greater than the length of non-marking laser line 116. I.e. in the extension direction (X-direction) of the laser line 110, the number of laser grooves of the marking laser line 111 is larger than the number of laser grooves of the non-marking laser line 116. The extra laser slots are located at the first end 112 and the second end 113 of the marking laser line 111.
The difference between the number of the marking laser lines 111 and the number of the non-marking laser lines 116 is in the range of 12 to 24.
Compared with the first and second examples, the number of ends where the marking laser line 111 is not flush with the non-marking laser line 116 is increased, and therefore, when distinguishing the marking laser line 111 from the non-marking laser line 116, since the first end 112 and the second end 113 have marks, it is not necessary to distinguish the first end 112 or the second end 113 first, and the marking laser line 111 can be found out quickly regardless of whether the first end 112 or the second end 113 is inspected. In this way, the search speed of the marking laser line 111 can be increased.
Example five, referring to fig. 5, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116, second end 113 of marking laser line 111 is also not flush with second end 113 of non-marking laser line 116, and marking laser line 111 has a length that is shorter than the length of non-marking laser line 116. That is, in the extending direction (X direction) of the laser line 110, the number of laser grooves of the marking laser line 111 is smaller than the number of laser grooves of the non-marking laser line 116, and the number of laser grooves at both the first end 112 and the second end 113 of the marking laser line 111 is smaller than the number of laser grooves at both the first end 112 and the second end 113 of the non-marking laser line 116.
The difference between the number of the marking laser lines 111 and the number of the non-marking laser lines 116 is in the range of 12 to 24.
Since the first end 112 and the second end 113 both have marks, when distinguishing the marked laser line 111 from the unmarked laser line 116, the first end 112 or the second end 113 does not need to be distinguished first, so that the searching speed of the marked laser line 111 can be improved.
Example six, referring to FIG. 6, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116, second end 113 of marking laser line 111 is also not flush with second end 113 of non-marking laser line 116, and the length of marking laser line 111 is equal to the length of non-marking laser line 116. I.e. in the extension direction (X-direction) of the laser lines 110 the number of laser grooves of the marking laser lines 111 is equal to the number of laser grooves of the non-marking laser lines 116, and the number of laser grooves at the first end 112 of the marking laser lines 111 is larger than the number of laser grooves at the first end 112 of the non-marking laser lines 116, and the number of laser grooves at the second end 113 of the marking laser lines 111 is smaller than the number of laser grooves at the second end 113 of the non-marking laser lines 116.
Since both the first end 112 and the second end 113 have marks, the search speed of the marked laser line 111 can be increased. Additionally, the number of laser grooves of the marking laser line 111 is equal to the number of laser grooves of the non-marking laser line 116 in example six, as compared to example four. I.e., the number of laser grooves of the marked laser line 111 in example six, is less than the number of laser grooves of the marked laser line 111 in example four. Therefore, in example 6, the solar cell sheet has fewer defects.
Example seven, referring to fig. 7, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116, second end 113 of marking laser line 111 is also not flush with second end 113 of non-marking laser line 116, and the width of marking laser line 111 in the direction perpendicular to the extension direction of laser line 110 (the perpendicular direction to the X direction) is different from the width of non-marking laser line 116. That is, example seven is a combination of example three and example four.
Because the difference between the marking laser line 111 and the non-marking laser line 116 is large, the speed of finding the marking laser line 111 is fast.
Example eight, referring to fig. 8, marking laser line 111 includes adjacent first and second laser lines 114, 115, the first laser line 114 of marking laser line 111 having a different width than the non-marking laser line 116, and the second laser line 115 of marking laser line 111 having the same width as the non-marking laser line 116.
I.e., the width of first laser line 114 is greater than the width of non-marking laser line 116. In the direction perpendicular to the extension of laser line 110 (perpendicular to the X-direction), the number of laser grooves of first laser line 114 is greater than the number of laser grooves of non-marking laser line 116. The difference in the number of laser grooves is within the range of 3 to 6.
In comparison with example three and example four, the width of the marking laser line 111 in example eight is not uniform, and the width of the entire marking laser line 111 in example three and example four is the same. The number of laser grooves for marking the laser lines 111 in example eight is small, and the defects of the solar cell sheet are small.
Fig. 10 is a partial enlarged view of a solar cell, and referring to fig. 10, an electrode 130 is disposed on a laser line 110 (refer to fig. 1 to 8); in the extending direction (X direction) of the laser line 110, the length of the electrode 130 is the same as the length of the laser line 110. Thus, the electrode 130 also has similar marking characteristics as the marking laser line 111 (see fig. 1-8), i.e., the electrode 130 may also include marking and non-marking electrodes.
If the production equipment of the electrode 130 and the laser grooving equipment are integrated in the same machine, the production status of the electrode 130 can be tracked through the marking feature of the electrode 130.
In summary, because there is a difference between the marking laser line 111 and the non-marking laser 116, the arrangement position of the marking laser line 111 can be made to correspond to the laser grooving apparatus, and the corresponding laser grooving apparatus can be found by finding the marking laser line 111 to track the production condition of the laser grooving apparatus.
A second embodiment of the present invention provides a solar cell, including: the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves; the plurality of laser lines are arranged in the extending direction vertical to the laser lines; each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side; wherein, the laser lines comprise at least one marking laser line and at least one non-marking laser line; the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line.
The solar cell of the present embodiment is substantially the same as the solar cell of the first embodiment, and the main differences include: the substrate in this embodiment includes a first region and a second region, each having a marking laser line therein. Fig. 11 to fig. 13 are schematic structural diagrams of a solar cell provided in this embodiment, and will be described in detail below with reference to the accompanying drawings.
Referring to fig. 11-13, the substrate 200 includes a first region 201 and a second region 202 that are contiguous. In this embodiment, the first region 201 and the second region 202 are two symmetric regions. Therefore, if the solar cell is to be cut to form two half pieces, the solar cell can be cut along the boundary between the first region 201 and the second region 202 to form two half pieces with the same size.
In this embodiment, the number of the laser lines 210 is even, so that the cutting lines do not overlap with the laser lines 210 when cutting is performed, and therefore the subfissure rate of the solar cell can be reduced. The total number of laser lines 210 is 160-174, such as 166. If the number of the laser lines 210 is too large, damage to the solar cell is large, and if the number of the laser lines 210 is too small, the carrier collection efficiency is affected. The number of laser lines 210 is in the range of 160-174, which can avoid the above two problems. When 166 laser lines 210 are provided, the overall performance of the solar cell is better.
A portion of the laser lines 210 are located within the first zone 201, and the laser lines 210 within the first zone 201 include at least one marking laser line 211 and at least one non-marking laser line 216; a portion of the laser lines 210 are located within the second region 202 and the laser lines 210 within the second region 202 include at least one marking laser line 211 and at least one non-marking laser line 216. Therefore, if the solar cell is cut to form two half pieces subsequently, each half piece is provided with a marking laser line 211, and each half piece can track corresponding laser grooving equipment through the marking laser line 211; if the cutting is not performed subsequently, each solar cell has a large number of marking laser lines 211, so that the searching speed of the marking laser lines 211 can be increased.
In this embodiment, a vertical laser line 220 is further provided in a direction perpendicular to the extending direction of the laser line 210 (perpendicular direction to the X direction), and the vertical laser line 220 connects the marked laser line 211 and the unmarked laser line 216.
Within the first region 201, the first end 212 of the marking laser line 211 is not flush with the first end 212 of the non-marking laser line 216, or the second end 213 of the marking laser line 211 is not flush with the second end 213 of the non-marking laser line 216, or the width of the marking laser line 211 is different from the width of the non-marking laser line 216; within the second region 202, the first end 212 of the marking laser line 211 is not flush with the first end 212 of the non-marking laser line 216, or the second end 213 of the marking laser line 211 is not flush with the second end 213 of the non-marking laser line 216, or the width of the marking laser line 211 is different than the width of the non-marking laser line 216.
The following are several specific examples of the marking laser lines 211 and the non-marking laser lines 216 of the first and second regions 201 and 202. It will be appreciated that several examples may be combined with each other.
Referring to fig. 11, within the first region 201, the first end 212 of the marking laser line 211 is not flush with the first end 212 of the non-marking laser line 216, and the length of the marking laser line 211 is different from the length of the non-marking laser line 216. I.e. in the extension direction (X-direction) of the laser line 210, the number of laser grooves of the marking laser line 211 is larger than the number of laser grooves of the non-marking laser line 216. The extra laser groove 140 is located at the first end 212 of the marking laser line 211. And the difference in the number of laser grooves is within the range of 12 to 24.
Within the second region 202, the first end 212 of the marking laser line 211 is not flush with the first end 212 of the non-marking laser line 216, and the length of the marking laser line 211 is different from the length of the non-marking laser line 216. I.e. in the extension direction (X-direction) of the laser line 210, the number of laser grooves of the marking laser line 211 is larger than the number of laser grooves of the non-marking laser line 216. The extra laser slots are located at the first end 212 of the marking laser line 211. And the difference in the number of laser grooves is within the range of 12 to 24.
Referring to fig. 12, within the first region 201, the second end 213 of the marking laser line 211 is not flush with the second end 213 of the non-marking laser line 216, and the length of the marking laser line 211 is different from the length of the non-marking laser line 216. I.e. in the extension direction (X-direction) of the laser line 210, the number of laser grooves of the marking laser line 211 is larger than the number of laser grooves of the non-marking laser line 216. The extra laser slot is located at the second end 213 of the marking laser line 211. And the difference in the number of laser grooves is within the range of 12 to 24.
Within the second region 202, the second end 213 of the marking laser line 211 is not flush with the second end 213 of the non-marking laser line 216, and the length of the marking laser line 211 is different from the length of the non-marking laser line 216. I.e. in the extension direction (X-direction) of the laser line 210, the number of laser grooves of the marking laser line 211 is larger than the number of laser grooves of the non-marking laser line 216. The extra laser slot is located at the second end 213 of the marking laser line 211. And the difference in the number of laser grooves is within the range of 12 to 24.
Referring to fig. 13, example three, referring to fig. 3, the width of the marking laser line 211 in the direction perpendicular to the extension direction of the laser line 210 (perpendicular direction to the X direction) is different from the width of the non-marking laser line 216.
The difference between the number of laser grooves of the marking laser line 211 and the number of laser grooves of the non-marking laser line 216 in the extending direction (perpendicular direction to the X direction) perpendicular to the laser line 210 is 3 to 6.
For other examples of the marking laser lines 211 of the first area 201 and the second area 202, reference may be made to the detailed description in the first embodiment, which is not repeated herein.
In this embodiment, the marking laser lines 211 of the first area 201 and the second area 202 are the same, and in other embodiments, the marking laser lines of the first area and the second area may be different. For example, in the first region, the first end of the marking laser line is not flush with the first end of the non-marking laser line; in the second region, the second end of the marking laser line is misaligned with the second end of the non-marking laser line. For another example, in the first zone, the first end of the marking laser line is not flush with the first end of the non-marking laser line, and in the second zone, the width of the marking laser line is different from the width of the non-marking laser line.
In summary, in the present embodiment, the first region 201 and the second region 202 both have the marking laser lines 211. If the solar cell is subsequently cut, each half piece is provided with a marking laser line 211, and each half piece can track corresponding laser grooving equipment through the marking laser line 211; if the cutting is not performed subsequently, each solar cell has a large number of marking laser lines 211, so that the searching speed of the marking laser lines 211 can be increased.
A third embodiment of the present invention provides a solar cell, including: the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves; the plurality of laser lines are arranged in the extending direction vertical to the laser lines; each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side; wherein, the laser lines comprise at least one marking laser line and at least one non-marking laser line; the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marked laser line is not flush with the second end of the unmarked laser line; or the width of the marking laser line in the direction perpendicular to the extension of the laser line is different from the width of the non-marking laser line.
The solar cell of the present embodiment is substantially the same as the solar cell of the first embodiment, and the main difference is that the solar cell of the present embodiment has a chamfer. For the same or similar parts in this embodiment, please refer to the first embodiment, which is not repeated herein.
Fig. 14 is a schematic structural diagram of a solar cell provided in this embodiment, and will be described in detail below with reference to the accompanying drawings.
Referring to fig. 14, the substrate 300 has a chamfer. Generally, a solar cell of monocrystalline silicon has a chamfer, and the main reason is that monocrystalline silicon is mainly produced by a pulling method, the pulling method produces a cylindrical silicon rod, the silicon rod is cut to form a wafer, and the wafer is cut to be rectangular, which causes a large loss, so that a chamfer can be directly formed. The solar cell slice made of polycrystalline silicon generally does not have a chamfer angle, and the main reason is that the polycrystalline silicon is mainly formed by a pouring method or a direct solidification method, silicon ingots are produced by the pouring method or the direct solidification method, and the silicon ingots can be directly formed into rectangular cell slices after being sliced.
Since the substrate 300 in this embodiment has chamfers, the length of the special laser line 314 between two opposing chamfers is short. Thus, to avoid confusion, the marking laser line 311 is not located between two opposing chamfers. The length of the other non-marking laser lines 316 is the same except for the special laser lines 314 located between two opposing chamfers, and the first ends 312 of all other non-marking laser lines 316 are flush and the second ends 313 of all other non-marking laser lines 316 are flush.
In the extending direction (perpendicular to the X direction) perpendicular to the laser line 310, there is also a vertical laser line 320, the vertical laser line 320 connecting the special laser line 314, the marking laser line 311 and the non-marking laser line 316.
In summary, in the present embodiment, the substrate 300 has chamfers, and the length of the special laser line 314 between two opposite chamfers is shorter than the length of the other non-marking laser lines 316. Because the length of the marking laser line 311 may also be different from the lengths of the other non-marking laser lines 316, the marking laser line 311 is not located between two opposite chamfers, thereby avoiding confusion, improving the accuracy of finding the marking laser line, and further improving the accuracy of tracking the production state of the laser grooving apparatus.
A fourth embodiment of the present invention provides a solar cell module, which includes several solar cells provided in the foregoing embodiments.
Generally, the solar cell is subjected to sorting, half-cutting, series welding, laying, laminating, deburring and framing to form a complete solar cell module.
The arrangement positions of the marking laser lines of the solar cell pieces produced by different laser grooving equipment in the extending direction perpendicular to the laser lines are different. Therefore, during the quality inspection of the solar photovoltaic module, by marking the arrangement position of the laser line 310 in the direction perpendicular to the extension direction of the laser line 310, the corresponding laser grooving apparatus can be determined. Therefore, if the solar cell module has hidden cracks, false welding or other bad sheets, the laser grooving equipment can be quickly positioned by marking the laser lines, so that the corresponding production process can be optimized.
A fifth embodiment of the present invention provides a method for manufacturing a solar cell.
The method for manufacturing the solar cell will be described in detail below. Fig. 1 to fig. 3 are schematic structural diagrams of a solar cell provided in this embodiment.
Referring to fig. 1-3, a plurality of substrates 100 are provided.
A plurality of laser grooving apparatuses are provided, and the respective substrates 100 are laser grooved by the laser grooving apparatuses to form a plurality of laser lines 110 on the surface of each substrate 100, each laser line 110 being composed of a plurality of discrete laser grooves.
The plurality of laser lines 110 include at least one marking laser line 111 and at least one non-marking laser line 116, and the marking laser line 111 is used for marking a corresponding laser grooving apparatus.
The laser line 110 has opposite first and second ends 112, 113, the first end 112 being on the same side and the second end 113 being on the same side.
Further, with reference to FIG. 1, first end 112 of marking laser line 111 is not flush with first end 112 of non-marking laser line 116; referring to FIG. 2, alternatively second end 113 of marking laser line 111 is not flush with second end 113 of non-marking laser line 116; or the width of the marking laser line 111 in the direction perpendicular to the extension direction of the laser line 110 (the perpendicular direction to the X direction) is different from the width of the non-marking laser line 116. It is understood that the above three schemes may also be combined with each other. For a detailed description of the marked laser line 111 and the non-marked laser line 116, please refer to the first to third embodiments, which will not be described herein.
The arrangement positions of the marking laser lines 111 corresponding to different laser grooving devices in the extending direction (the vertical direction of the X direction) perpendicular to the laser line 110 are different.
The correspondence between the arrangement position of the marking laser lines 111 and the laser grooving apparatus will be specifically described below.
In this embodiment, different laser grooving apparatuses are sequenced, so that each laser grooving apparatus has a first number. In one example, the number of laser grooving apparatuses is 10, so each laser grooving apparatus is ordered from 1 to 10, with the first numbers being 1, 2, 3 … … 9, 10 in that order.
It will be appreciated that in other embodiments, the laser grooving apparatus may be sequenced in other ways.
In this embodiment, the laser lines 110 on each substrate 100 are numbered such that each laser line 110 has a second number. In one example, top edge 150 is a side parallel to the X-direction, with respect to top edge 150 of substrate 100. The second number of laser line 110 closest to top edge 150 is 1, and the closer the distance from top edge 150, the smaller the second number; the second number is greater the further away from top edge 150.
Taking fig. 1 as an example, the second number of the marked laser line 110 is 3, which indicates that the solar cell is produced by the laser grooving apparatus with the first number of 3. In another example, if the second number of the marked laser line is 6, the solar cell is produced by the laser grooving equipment with the second number of 6.
It will be appreciated that in other embodiments, the position of the marked laser lines in the direction perpendicular to the X direction may be linked to the laser grooving apparatus according to other predetermined rules. So that the marked laser lines on different arrangement positions correspond to different laser grooving equipment.
After the production of the solar cell or the solar module is finished, checking the quality of the product; if the product quality is not qualified, searching a marking laser line 111; determining a corresponding laser grooving apparatus by marking an arrangement position of the laser line 111 in a direction (a vertical direction of the X direction) perpendicular to the extending direction of the laser line 110; and checking the production condition of the laser line of the laser grooving equipment, and optimizing the production process according to the performance of the solar cell or the solar cell module.
In this embodiment, after the laser line 110 is formed, screen printing is performed to form an electrode on the laser line 110, and the length of the electrode is the same as that of the laser line. In the screen printing process, a silver electrode covering the laser line 110 is formed first, and then an aluminum back field is printed on the entire back surface of the substrate 100. The height of the silver electrode is about 12.1 μm, and the height of the aluminum back electrode is about 4 μm.
In the screen printing process, different electrode patterns are formed, the type and the amount of the adopted slurry have great influence on the yield of the solar cell and the solar cell module, and the false soldering and hidden crack data can be reduced by half by adjusting production parameters.
Therefore, the production equipment of the electrode and the laser grooving equipment are integrated in the same machine, the electrode also has the similar characteristics with the laser line 110, and the electrode comprises: a labeled electrode and a non-labeled electrode. In the process of checking the product quality, the corresponding electrode production equipment can be searched by marking the electrode, and the production condition of the electrode production equipment is checked, so that the electrode production process is optimized.
In summary, the manufacturing method of the solar cell provided in this embodiment can associate the arrangement position of the marking laser line with the laser grooving device, so that the corresponding laser grooving device can be found by marking the position of the laser line, and the production condition of the laser grooving device and the influence of the back laser technology on the quality of the solar cell can be tracked.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A solar cell, comprising:
the laser device comprises a substrate and a plurality of laser lines formed on the surface of the substrate, wherein each laser line consists of a plurality of discrete laser grooves;
the laser lines are arranged in the extending direction perpendicular to the laser lines;
each laser line is provided with a first end and a second end which are opposite, the first ends are positioned on the same side, and the second ends are positioned on the same side;
wherein the plurality of laser lines comprise at least one marked laser line and at least one unmarked laser line;
the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the extending direction perpendicular to the laser line is different from the width of the non-marking laser line;
in the extending direction of the laser lines, the number of the laser grooves of the marked laser lines is larger than that of the laser grooves of the unmarked laser lines.
2. The solar cell slice of claim 1, wherein the difference between the number of the laser grooves of the marked laser lines and the non-marked laser lines in the extending direction of the laser lines is 12-24; or in the extending direction perpendicular to the laser lines, the difference between the number of the laser grooves of the marked laser lines and the number of the laser grooves of the unmarked laser lines is 3-6.
3. The solar cell sheet of claim 1, wherein the substrate comprises a first region and a second region that are contiguous;
part of the laser lines are located in the first area, and the laser lines in the first area comprise at least one marking laser line and at least one non-marking laser line;
part of the laser lines are located in the second area, and the laser lines in the second area comprise at least one marking laser line and at least one non-marking laser line;
in the first zone, the first end of the marking laser line is not flush with the first end of the non-marking laser line, or the second end of the marking laser line is not flush with the second end of the non-marking laser line, or the width of the marking laser line is different from the width of the non-marking laser line;
in the second zone, the first end of the marking laser line is not flush with the first end of the non-marking laser line, or the second end of the marking laser line is not flush with the second end of the non-marking laser line, or the width of the marking laser line is different from the width of the non-marking laser line.
4. The solar cell sheet according to claim 1, wherein an electrode is provided on the laser line; in the extending direction of the laser line, the length of the electrode is the same as that of the laser line.
5. The solar cell slice of claim 1, wherein the marking laser lines comprise a first laser line and a second laser line that are adjacent, the first laser line of the marking laser lines has a different width than the non-marking laser lines, and the second laser line of the marking laser lines has the same width as the non-marking laser lines.
6. A solar cell module, comprising: the solar cell pieces as claimed in any one of claims 1 to 5, wherein the arrangement positions of the marking laser lines of the solar cell pieces produced by different laser grooving equipment in the direction perpendicular to the extension direction of the laser lines are different.
7. A method for manufacturing a solar cell, comprising:
providing a plurality of substrates;
providing a plurality of laser grooving devices, and performing laser grooving on the corresponding substrates through the laser grooving devices so as to form a plurality of laser lines on the surface of each substrate, wherein each laser line consists of a plurality of discrete laser grooves;
the laser lines comprise at least one marking laser line and at least one non-marking laser line, and the marking laser line is used for marking the corresponding laser grooving equipment;
the laser lines are arranged in the extending direction perpendicular to the laser lines;
the laser line is provided with a first end and a second end which are opposite, the first end is positioned on the same side, and the second end is positioned on the same side;
the arrangement positions of the marking laser lines corresponding to different laser grooving equipment in the extending direction perpendicular to the laser lines are different;
the first end of the marking laser line is not flush with the first end of the non-marking laser line; or the second end of the marking laser line is not flush with the second end of the non-marking laser line; or the width of the marking laser line in the direction perpendicular to the extension direction of the laser line is different from the width of the non-marking laser line.
8. The method for manufacturing the solar cell piece according to claim 7, further comprising the step of, after forming the laser line: checking the product quality; if the product quality is not qualified, searching the marking laser line; determining the corresponding laser grooving equipment according to the arrangement position of the marked laser line in the extending direction vertical to the laser line; checking the production condition of the laser line of the laser grooving apparatus.
9. The method for manufacturing a solar cell sheet according to claim 8, further comprising, before the product quality inspection, the steps of: forming an electrode on the laser line, wherein production equipment of the electrode and the laser grooving equipment are integrated in the same machine; in the process of the product quality inspection, the production condition of the production equipment of the electrode is also inspected.
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| CN114664953A (en) | 2022-06-24 |
| CN114664953B (en) | 2024-03-29 |
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