CN114664953B - Solar cell module, solar cell sheet, and method for manufacturing solar cell sheet - Google Patents

Solar cell module, solar cell sheet, and method for manufacturing solar cell sheet Download PDF

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Publication number
CN114664953B
CN114664953B CN202210281637.7A CN202210281637A CN114664953B CN 114664953 B CN114664953 B CN 114664953B CN 202210281637 A CN202210281637 A CN 202210281637A CN 114664953 B CN114664953 B CN 114664953B
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laser line
laser
marking
line
marking laser
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CN114664953A (en
Inventor
刘自龙
黄磊
陈刚
周方开
王利朋
张磊磊
丁留伟
查娟娟
卫国琴
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Zhejiang Jinko Solar Co Ltd
Jinko Solar Haining Co Ltd
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Zhejiang Jinko Solar Co Ltd
Jinko Solar Haining Co Ltd
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Manufacturing & Machinery (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The embodiment of the invention provides a solar cell module, a solar cell and a manufacturing method thereof. The solar cell includes: a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting of a plurality of discrete laser grooves; the laser lines are arranged in the extending direction perpendicular to the laser lines; each laser line has opposite first and second ends; wherein the plurality of laser lines includes 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 extending direction perpendicular to the laser line is different from the width of the non-marking laser line; the number of laser grooves marking the laser line is less than or equal to the number of laser grooves non-marking the laser line in the extending direction of the laser line. The embodiment of the invention can track the corresponding laser grooving equipment.

Description

Solar cell module, solar cell sheet, and method for manufacturing solar cell sheet
The present application is a divisional application made in chinese patent application with application number 2020113782360, application date 2020, 11/30, and entitled "solar cell module, solar cell sheet, and method of manufacturing the same".
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, the passivated emitter and back cell (PERC, passivated Emitterand Rear Cell) has become the mainstream solar cell due to its technical and cost advantages, and its capacity has been rapidly expanding in recent years. The core of the PERC cell is to add a fully covered back passivation film to a conventional solar cell, wherein the back passivation film can greatly reduce photoelectric loss, increase light absorptivity and remarkably reduce back surface recombination current density. In the selection of passivation film materials. The alumina has higher charge density, can provide good passivation for the P-type surface, and is a back passivation material widely applied to PERC battery pieces at present. In addition to aluminum oxide, silicon oxynitride, and the like may also be used as the back passivation material. In addition, in order to fully meet the back passivation conditions, a layer of silicon nitride is coated on the surface of aluminum oxide to protect the back passivation film and ensure the optical performance of the back of the battery. The PERC cell has two important steps more than the conventional solar cell production process, including: a backside passivation layer is deposited and then laser grooved to form backside contacts.
The influence of the back laser technology on the quality of the PERC battery piece is great, so that the influence of the tracking back laser technology on the solar battery piece and the solar module becomes a problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides a solar cell, a solar cell module and a manufacturing method of the solar cell, so as to track the influence of a back laser technology on the solar cell and the solar module.
In order to solve the above problems, an embodiment of the present invention provides a solar cell, including: a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting of a plurality of discrete laser grooves; the laser lines are arranged in the extending direction perpendicular to the laser lines; each laser line has a first end and a second end opposite to each other, the first ends being located on the same side, and the second ends being located on the same side; wherein the plurality of laser lines includes 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 extending direction perpendicular to the laser line is different from the width of the non-marking laser line; the number of laser grooves marking the laser line is less than or equal to the number of laser grooves non-marking the laser line in the extending direction of the laser line.
In addition, the number of the laser grooves of the marking laser line is smaller than the number of the laser grooves of the non-marking laser line, and a difference between the number of the laser grooves of the marking laser line and the number of the laser grooves of the non-marking laser line in an extending direction of the laser line is 12 to 24.
In addition, the first end of the marking laser line is not flush with the first end of the non-marking laser line, the second end of the marking laser line is not flush with the second end of the non-marking laser line, and a length of the marking laser line is equal to a length of the non-marking laser line.
In addition, the substrate includes a first region and a second region adjacent to each other; a portion of the laser lines are located within the first region, and the laser lines within the first region include at least one of the marking laser lines and at least one of the non-marking laser lines; a portion of the laser lines are located within the second region, and the laser lines within the second region include at least one of the marking laser lines and at least one of the non-marking laser lines; within the first region, 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 a width of the marking laser line is different from a width of the non-marking laser line; in the second region, 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 addition, the number of the laser lines is an even number.
In addition, an electrode is arranged on the laser line; the length of the electrode is the same as the length of the laser line in the extending direction of the laser line.
The embodiment of the invention also provides a solar cell module, which comprises: the marking laser lines of the solar cell produced by different laser grooving equipment are different in arrangement positions in the extending direction perpendicular to the laser lines.
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 carrying out 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 plurality of laser lines comprise at least one marking laser line and at least one non-marking laser line, and the marking laser lines are 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 has 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; wherein, the arrangement positions of the marking laser lines corresponding to different laser grooving devices 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 extending direction perpendicular to the laser line is different from the width of the non-marking laser line.
In addition, after forming the laser line, the method further comprises the steps of: checking the quality of the product; if the product quality is unqualified, searching the marking laser line; determining the corresponding laser grooving device by the arrangement position of the marking laser line in the extending direction perpendicular 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 further comprises the steps of: forming an electrode on the laser line, wherein the production equipment of the electrode and the laser grooving equipment are integrated in the same machine; during the 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 the marking laser line, wherein the first end of the marking laser line is not level 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 this manner, the marking laser line may be distinguished from the non-marking laser line by a first end, a second end, or a width; further, marking laser lines of solar cells produced by different laser slotting devices can be arranged at different arrangement positions, namely, the arrangement positions of the marking laser lines correspond to the laser slotting devices; for a certain solar cell, the characteristic of the marking laser line is different from that of the non-marking laser line, so that the marking laser line can be quickly found, and the laser grooving equipment corresponding to the solar cell is found through the arrangement position of the marking laser line, so that 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 to each other, and the first area and the second area are provided with marking laser lines. If the substrate is subsequently cut to form half pieces, both half pieces have marking laser lines thereon by which the corresponding laser grooving apparatus can be traced. If no cutting is performed subsequently, the speed of searching the marking laser line and tracking the laser grooving device can be increased because the number of the marking laser lines on the substrate is large.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, which are not to be construed as limiting the embodiments unless specifically indicated otherwise.
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 according to the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third solar cell according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fourth solar cell according to the first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fifth solar cell according to the first embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a sixth solar cell according to the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a seventh solar cell according to the first embodiment of the present invention;
fig. 8 is a schematic structural diagram of an eighth solar cell according to the first embodiment of the present invention;
fig. 9 is a schematic structural diagram of a laser groove of a solar cell according to a first embodiment of the present invention;
fig. 10 is a partial enlarged view of a solar cell according to 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 according to a second embodiment of the present invention;
fig. 13 is a schematic structural diagram of a third solar cell according to a second embodiment of the present invention;
fig. 14 is a schematic structural diagram of a solar cell according to a third embodiment of the present invention.
Detailed Description
As known from the background art, tracking the influence of the back laser technology on the solar cell and the solar module is a problem to be solved.
The main reasons found by analysis include: the laser lines formed by the back laser technology have a great influence on the efficiency of the solar cell, because the screen printing is performed after the laser lines are formed so as to fill the electrode slurry in the laser grooves of the laser lines; after screen printing, sintering is carried out to realize ohmic contact between the electrode and the substrate of the solar cell; namely, the part of the laser groove is metallized, and the resistance of the laser groove is much larger than that of the electrode; 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 under different laser grooving equipment, different laser line patterns and different parameter designs and the subsequent solar cell assembly are closely related.
However, the solar cell produced at present is only distinguished by workshops, and different devices in the workshops are not distinguished; in the quality inspection process of the finished product, the finished product is classified according to the high and low opening pressures of the efficiency grade, and is not distinguished according to specific production equipment; therefore, when the solar cell is shipped or prepared into a solar photovoltaic module, the laser line for producing the solar cell cannot be accurately positioned by which laser grooving device is used for producing the solar cell.
Therefore, tracking the influence of the back laser technology on the solar cell and the solar module is a major issue to be resolved.
In order to solve the above problems, the present invention provides a solar cell having a marking laser line, a first end of the marking laser line is not level with a first end of a 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 this manner, the marking laser line may be distinguished from the non-marking laser line by a first end, a second end, or a width; further, a correspondence between the laser grooving apparatus and the arrangement position of the marking laser line may be established; for a certain solar cell, the characteristic of the marking laser line is different from that of the non-marking laser line, so that the marking laser line 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 marking laser line and the laser grooving equipment, so that 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.
For the purpose of making 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, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
A first embodiment of the present invention provides a solar cell, including: a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting 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, wherein 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 includes 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 direction of the laser line is different from the width of the non-marking laser line. Fig. 1 to 10 are schematic structural views of a solar cell according to a first embodiment of the present invention, and the following description will specifically refer to the accompanying drawings.
Referring to fig. 1-9 in combination, in this embodiment, the substrate 100 has a side length of about 158.75cm. The structure of the substrate 100 includes a base, an emitter, a passivation layer, and an anti-reflection layer. The material of the matrix is mainly monocrystalline silicon or polycrystalline silicon; the emitter is used for receiving sunlight and generating photo-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 carrier recombination and improving photoelectric conversion efficiency. In this embodiment, the passivation layer is Al 2 O 3 a/SixNy bilayer structure and forming Al using atomic layer deposition techniques 2 O 3 Films and SixNy films.
The surface of the substrate 100 has a plurality of laser lines 110, each laser line 110 being comprised of a plurality of discrete laser grooves 140. Since the passivation layer has poor conductivity, it is necessary to perform grooving on the passivation layer on the back side of the substrate 100 using a laser. The laser groove 140 is formed to penetrate part of the passivation layer and expose the substrate, and the electrode formed later 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 on the surface of the passivation layer, the material of the passivation layer absorbs laser energy, so that the temperature rises, and melting, ablation and evaporation are generated, thereby achieving the purposes of removing part of the passivation layer material and exposing the matrix.
With further reference to fig. 9, fig. 9 is a schematic structural view of a laser groove of a solar cell. The diameter of the laser groove 140 is in the range of 37.4 μm to 37.8 μm, such as 37.5 μm, 37.6 μm, or 37.7 μm. If the diameter of the laser groove 140 is too large, more defects may be caused, thereby improving 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 be increased, 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 μm, and both of the above problems can be avoided.
The pitch of the two laser grooves 140 is in the range of 4.1 μm to 4.3 μm, such as 4.2 μm. If the pitch between the two laser grooves 140 is too small, overlapping between the laser grooves 140 is likely to occur, and damage to the base material is further 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, which makes it difficult for the electrodes to collect carriers sufficiently. The interval between the two laser grooves 140 is in the range of 4.1 μm to 4.3 μm, so that the two problems can be avoided.
Referring to fig. 1-8, the plurality of laser lines 110 are arranged in a direction perpendicular to an extending direction of the laser lines 110, i.e., the plurality of 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 number 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 157mm.
In this embodiment, there is also a vertical laser line 120 in the extending direction (the vertical direction of the X direction) perpendicular to the laser line 110, 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 the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116; or the width of the marking laser line 111 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 110 is different from the width of the non-marking laser line 116. As such, the marking laser line 111 may be distinguished from the non-marking laser line 116 by the first end 112, the second end 113, or the width; further, a correspondence relationship of the arrangement positions of the laser grooving apparatus and the marking laser line 111 may be established; for a certain solar cell, since the features of the marking laser line 111 and the non-marking laser line 116 are different, the marking laser line 111 can be quickly found, and the laser grooving device for producing the solar cell can be found through the corresponding relation between the arrangement position of the marking laser line 111 and the laser grooving device, so as to track the production condition of the laser grooving device.
The following are several specific examples of marking laser line 111 and non-marking laser line 116. It will be appreciated that several examples may be combined with each other.
For example, referring to fig. 1, 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, and the length of the marking laser line 111 is different from the length of the non-marking laser line 116. That is, 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 in the extending direction (X direction) of the laser line 110. The plurality of laser slots are 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, i.e. 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 appreciated that if the difference between the number of laser grooves is large, more defects are liable to be 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 non-marking laser line 116 is in the range of 12 to 24, and both of the above problems can be avoided.
For example two, referring to fig. 2, the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116, and the length of the marking laser line 111 is greater than the length of the non-marking laser line 116. That is, 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 in the extending direction (X direction) of the laser line 110. The plurality of laser slots are located at the second end 113 of the marking laser line 111.
The difference between the number of marking laser lines 111 and the number of non-marking laser lines 116 is in the range of 3 to 6, and may be specifically 4 or 5.
Example three, referring to fig. 3, the width of the marking laser line 111 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 110 is different from the width of the non-marking laser line 116.
I.e. in the direction perpendicular to the extension of the laser line 110 (perpendicular to the X-direction), the number of laser grooves of the marking laser line 111 and the non-marking laser line 116 is different. And the difference between the number of laser grooves of the marking laser line 111 and the non-marking laser line 116 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 110 is 3 to 6. It can be appreciated that if the difference between the number of laser grooves is large, more defects are liable to be caused; if the difference in the number is small, the speed is slow when the mark laser line 111 is discriminated from the non-mark laser line 116. Therefore, the difference between the number of marking laser lines 111 and the number of non-marking laser lines 116 is in the range of 3 to 6, and both of the above problems can be avoided.
In example four, referring to fig. 4, 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, the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116, and the length of the marking laser line 111 is greater than the length of the non-marking laser line 116. That is, 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 in the extending direction (X direction) of the laser line 110. The plurality of laser slots are located at a first end 112 and a second end 113 of the marking laser line 111.
The difference between the number of marking laser lines 111 and non-marking laser lines 116 is in the range of 12-24.
The number of ends of the marking laser line 111 which are not flush with the non-marking laser line 116 increases compared to the first and second examples, and therefore, when the distinction between the marking laser line 111 and the non-marking laser line 116 is made, since both the first end 112 and the second end 113 have marks, the distinction of the first end 112 or the second end 113 does not need to be made first, and the marking laser line 111 can be quickly found regardless of whether the first end 112 or the second end 113 is inspected. In this way, the search speed of the marker laser line 111 can be increased.
Example five, referring to fig. 5, 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, the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116, and the length of the marking laser line 111 is shorter than the length of the non-marking laser line 116. That is, the number of laser grooves of marking laser line 111 is smaller than the number of laser grooves of non-marking laser line 116 in the extending direction (X-direction) of laser line 110, and the number of laser grooves at both first end 112 and second end 113 of marking laser line 111 is smaller than the number of laser grooves at both first end 112 and second end 113 of non-marking laser line 116.
The difference between the number of marking laser lines 111 and non-marking laser lines 116 is in the range of 12-24.
Since both 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 when distinguishing the marking laser line 111 from the non-marking laser line 116, and thus the search speed of the marking laser line 111 can be increased.
For example six, referring to fig. 6, 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, the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116, and the length of the marking laser line 111 is equal to the length of the 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 equal to the number of laser grooves of the non-marking laser line 116, and the number of laser grooves at the first end 112 of the marking laser line 111 is greater than the number of laser grooves at the first end 112 of the non-marking laser line 116, and the number of laser grooves at the second end 113 of the marking laser line 111 is less than the number of laser grooves at the second end 113 of the non-marking laser line 116.
Since both the first end 112 and the second end 113 have marks, the search speed of the marking laser line 111 can be increased. In addition, the number of laser grooves of the marking laser line 111 in example six is equal to the number of laser grooves of the non-marking laser line 116, as compared with example four. I.e., the number of laser slots marking the laser line 111 in example six is less than the number of laser slots marking the laser line 111 in example four. Therefore, in example 6, the defects of the solar cell sheet were fewer.
Example seven, referring to fig. 7, 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, the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116, and the width of the marking laser line 111 in the extending direction perpendicular to the laser line 110 (the perpendicular direction to the X direction) is different from the width of the non-marking laser line 116. I.e., 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 high.
Example eight, referring to fig. 8, marking laser line 111 includes first laser line 114 and second laser line 115 that are contiguous, the width of first laser line 114 of marking laser line 111 is different than the width of non-marking laser line 116, and the width of second laser line 115 of marking laser line 111 is the same as the width of non-marking laser line 116.
I.e. the width of the first laser line 114 is larger than the width of the non-marking laser line 116. The number of laser grooves of the first laser line 114 is greater than the number of laser grooves of the non-marking laser line 116 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 110. The difference in the number of laser grooves is in the range of 3 to 6.
The width of the marking laser line 111 in example eight is not uniform compared to example three and example four, and the width of the entire marking laser line 111 in example three and example four is the same. The number of laser grooves marking the laser line 111 in example eight is smaller, and defects of the solar cell sheet are smaller.
Fig. 10 is a partial enlarged view of a solar cell, referring to fig. 10, an electrode 130 is provided 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 comprise a marking electrode and a non-marking electrode.
If the production equipment of the electrode 130 and the laser grooving equipment are integrated in the same machine, the production condition of the electrode 130 can be tracked through the marking characteristics of the electrode 130.
In summary, since there is a difference between the marking laser line 111 and the non-marking laser line 116, the arrangement position of the marking laser line 111 can be corresponding to the laser grooving apparatus, and the corresponding laser grooving apparatus can be found by searching the marking laser line 111, so as to track the production condition of the laser grooving apparatus.
A second embodiment of the present invention provides a solar cell, including: a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting 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, wherein 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 includes 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 direction 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 13 are schematic structural views of a solar cell according to the present embodiment, and will be described in detail with reference to the accompanying drawings.
Referring to fig. 11-13, a 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 symmetrical two regions. Therefore, if the solar cell is cut to form two half pieces later, the two half pieces having the same size may be formed by cutting along the boundary between the first region 201 and the second region 202.
In this embodiment, the number of the laser lines 210 is even, so that the dicing lines do not overlap with the laser lines 210 when dicing is performed, and thus the hidden crack rate of the solar cell can be reduced. The total number of laser lines 210 is in the range of 160-174, e.g., 166. If the number of the laser lines 210 is too large, the damage of the solar cell is large, and if the number of the laser lines 210 is too small, the collection efficiency of carriers is affected. The number of laser lines 210 is in the range of 160 to 174, and both of the above problems can be avoided. When the number of the laser lines 210 is 166, the solar cell has better comprehensive performance.
A portion of the laser line 210 is located within the first region 201, and the laser line 210 within the first region 201 includes at least one marked laser line 211 and at least one unmarked laser line 216; a portion of the laser line 210 is located within the second region 202, and the laser line 210 within the second region 202 includes at least one marked laser line 211 and at least one unmarked laser line 216. Therefore, if the solar cell is to be cut later to form two half-sheets, each half-sheet has a marking laser line 211 thereon, and each half-sheet can trace the corresponding laser grooving apparatus through the marking laser line 211; if no dicing is performed subsequently, each solar cell has a larger number of marking laser lines 211, so that the search speed of the marking laser lines 211 can be increased.
In this embodiment, there is also a vertical laser line 220 in the extending direction (the vertical direction of the X direction) perpendicular to the laser line 210, and the vertical laser line 220 connects the marking laser line 211 and the non-marking 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 from the width of the non-marking laser line 216.
The following are several specific examples of the marking laser line 211 and the non-marking laser line 216 of the first region 201 and the second region 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. the number of laser grooves of the marking laser line 211 is greater than the number of laser grooves of the non-marking laser line 216 in the extending direction (X-direction) of the laser line 210. The plurality of laser slots 140 are located at a first end 212 of the marking laser line 211. And the difference between the number of laser grooves is in the range of 12-24.
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. the number of laser grooves of the marking laser line 211 is greater than the number of laser grooves of the non-marking laser line 216 in the extending direction (X-direction) of the laser line 210. A plurality of laser grooves are located at a first end 212 of marking laser line 211. And the difference between the number of laser grooves is in the range of 12-24.
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. the number of laser grooves of the marking laser line 211 is greater than the number of laser grooves of the non-marking laser line 216 in the extending direction (X-direction) of the laser line 210. The plurality of laser slots are located at the second end 213 of the marking laser line 211. And the difference between the number of laser grooves is in the range of 12-24.
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. the number of laser grooves of the marking laser line 211 is greater than the number of laser grooves of the non-marking laser line 216 in the extending direction (X-direction) of the laser line 210. The plurality of laser slots are located at the second end 213 of the marking laser line 211. And the difference between the number of laser grooves is in the range of 12-24.
Referring to fig. 13, example three, referring to fig. 3, the width of the marking laser line 211 in the extending direction (the vertical direction of the X direction) perpendicular to the laser line 210 is different from the width of the non-marking laser line 216.
The difference in the number of laser grooves of the marking laser line 211 and the non-marking laser line 216 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 210 is 3 to 6.
Other examples of the marking laser lines 211 of the first region 201 and the second region 202 may also refer to the specific description in the first embodiment, and will not be described herein.
In this embodiment, the marking laser lines 211 of the first region 201 and the second region 202 are the same, and in other embodiments, the marking laser lines of the first region and the second region 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 not aligned with the second end of the non-marking laser line. For another 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, and in the second region, 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 have the marking laser line 211. If the solar cell is to be cut later, each half of the solar cell is provided with a marking laser line 211, and each half of the solar cell can trace the corresponding laser grooving device through the marking laser line 211; if no dicing is performed subsequently, each solar cell has a larger number of marking laser lines 211, so that the search speed of the marking laser lines 211 can be increased.
A third embodiment of the present invention provides a solar cell, including: a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting 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, wherein 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 includes 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 direction of the laser line is different from the width of the non-marking laser line.
The present embodiment is substantially the same as the solar cell in the first embodiment, and is mainly different in that the solar cell in the present embodiment has a chamfer therein. In this embodiment, please refer to the first embodiment, and the description thereof is omitted.
Fig. 14 is a schematic structural diagram of a solar cell according to the present embodiment, and will be described in detail with reference to the accompanying drawings.
Referring to fig. 14, the substrate 300 has a chamfer. Generally, a solar cell of single crystal silicon has a chamfer, mainly because single crystal silicon is mainly produced by a pulling method, a cylindrical silicon rod is produced by the pulling method, the silicon rod is cut to form a wafer, and the wafer is cut to be rectangular, so that a great loss is caused, and the chamfer can be directly formed. The solar cell slice of the polysilicon generally has no chamfer angle, and the main reason is that the polysilicon is mainly formed by a pouring method or a direct solidification method, and a silicon ingot is produced by the pouring method or the direct solidification method, and the silicon ingot can be directly formed into a rectangular cell slice 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, 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 line 314 located between two opposite 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 (the vertical direction of the X direction) perpendicular to the laser line 310, there is also a vertical laser line 320, and the vertical laser line 320 connects the special laser line 314, the marking laser line 311, and the non-marking laser line 316.
In summary, in this embodiment, the substrate 300 has chamfer angles, and the length of the special laser line 314 between two opposite chamfer angles is shorter than the length of the other non-marking laser lines 316. Because the length of the marking laser line 311 may 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, so that confusion can be avoided, and the accuracy of searching the marking laser line is improved, and the accuracy of tracking the production state of the laser grooving apparatus is further improved.
A fourth embodiment of the present invention provides a solar cell module, including the solar cells provided in the foregoing embodiments.
Generally, the solar cell is sorted, cut into half pieces, series welded, laid, laminated, deflashed, and framed to form a complete solar cell module.
The marking laser lines of the solar cells produced by different laser grooving devices are arranged at different positions in the extending direction perpendicular to the laser lines. Accordingly, in the quality inspection process of the solar photovoltaic module, by marking the arrangement position of the laser lines 310 in the extending direction perpendicular to the laser lines 310, the corresponding laser slotting apparatus can be determined. Therefore, if the solar cell module has hidden cracks, virtual joints or other bad sheets, the marking laser line can be rapidly positioned to the laser grooving equipment, so that the corresponding production process can be optimized.
A fifth embodiment of the present invention provides a method for manufacturing a solar cell.
Hereinafter, a method of manufacturing the solar cell will be described in detail. Fig. 1 to fig. 3 are schematic structural diagrams of a solar cell according to the present embodiment.
Referring to fig. 1-3, a plurality of substrates 100 are provided.
A plurality of laser slotting apparatuses are provided, and the respective substrates 100 are laser-slotted by the laser slotting 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 slots.
The plurality of laser lines 110 includes at least one marking laser line 111 and at least one non-marking laser line 116, the marking laser line 111 being used to mark a corresponding laser grooving apparatus.
The plurality of laser lines 110 are arranged in a direction perpendicular to the extending direction of the laser lines 110, i.e., the plurality of laser lines 110 are arranged in a direction perpendicular to the X-direction.
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, referring to fig. 1, 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; referring to fig. 2, or the second end 113 of the marking laser line 111 is not flush with the second end 113 of the non-marking laser line 116; or the width of the marking laser line 111 in the extending direction (the perpendicular direction to the X direction) perpendicular to the laser line 110 is different from the width of the non-marking laser line 116. It will be appreciated that the three schemes described above may also be combined with each other. For a detailed description of the marking laser line 111 and the non-marking laser line 116, please refer to the first embodiment to the third embodiment, and the detailed description is omitted herein.
Wherein the arrangement positions of the marking laser lines 111 corresponding to different laser grooving apparatuses are different in the extending direction (the vertical direction of the X direction) perpendicular to the laser line 110.
The correspondence between the arrangement positions of the marking laser lines 111 and the laser grooving apparatus will be specifically described below.
In this embodiment, the different laser grooving apparatuses are ordered such that each laser grooving apparatus has a first number. In one example, the number of laser grooving devices is 10, so each laser grooving device is ordered from 1 to 10, with the first number being 1, 2, 3 … …, 10 in turn.
It will be appreciated that in other embodiments, the laser slotting devices may be ordered in other ways as well.
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 of substrate 100 is oriented such that top edge 150 is an edge parallel to the X-direction. The second number of the laser line 110 closest to the top edge 150 is 1, and the closer the distance from the top edge 150 is, the smaller the second number is; the greater the distance from the top edge 150, the greater the second number.
Taking fig. 1 as an example, the second number of the marking laser line 110 is 3, which illustrates that the solar cell is produced by the first number 3 laser slotting device. In other examples, if the second number of the marking laser line is 6, it is explained that the solar cell is produced by the second number 6 laser grooving apparatus.
It will be appreciated that in other embodiments, the relationship between the alignment of the marking laser lines in a direction perpendicular to the X-direction and the laser grooving apparatus may be established according to other predetermined rules. So that the marking laser lines at different arrangement positions correspond to different laser grooving devices.
After the production of the solar cell is finished, or after the production of the solar module is finished, the product quality inspection is carried out; if the product quality is not acceptable, searching for a marking laser line 111; the corresponding laser grooving apparatus is determined by marking the arrangement position of the laser line 111 in the extending direction (the perpendicular direction to the X direction) perpendicular to 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 component.
In this embodiment, after forming the laser line 110, screen printing is further 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, silver electrodes are formed to cover the laser lines 110, and then an aluminum back field is printed on the entire back surface of the substrate 100. The silver electrode has a height of about 12.1 μm and the aluminum back electrode has a height of about 4 μm.
In the screen printing process, different electrode patterns, the type of the adopted sizing agent and the dosage have great influence on the yield of the solar cell and the solar cell component, and the data of the cold joint and the hidden crack can be directly reduced by half by adjusting production parameters.
Thus, the production equipment of the electrode is integrated with the laser grooving equipment in the same machine, the electrode also has similar features as the laser line 110, the electrode comprises: marked electrodes and unmarked electrodes. In the process of product quality inspection, the production equipment of the corresponding electrode can be found through the marked electrode, and the production condition of the production equipment of the electrode is inspected, so that the production process of the electrode is optimized.
In summary, the method for manufacturing a solar cell provided in this embodiment may associate the arrangement position of the marking laser line with the laser grooving apparatus, so that the corresponding laser grooving apparatus can be found through the position of the marking laser line, thereby tracking the production condition of the laser grooving apparatus and the influence of the back laser technology on the quality of the solar cell.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of 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. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is therefore intended to be limited only by the appended claims.

Claims (10)

1. A solar cell, comprising:
a substrate and a plurality of laser lines formed on the surface of the substrate, each laser line consisting of a plurality of discrete laser grooves;
the laser lines are arranged in the extending direction perpendicular to the laser lines;
each laser line has a first end and a second end opposite to each other, the first ends being located on the same side, and the second ends being located on the same side;
wherein the plurality of laser lines includes 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 extending direction perpendicular to the laser line is different from the width of the non-marking laser line;
the number of the laser grooves of the marking laser line is smaller than or equal to the number of the laser grooves of the non-marking laser line in an extending direction of the laser line.
2. The solar cell according to claim 1, wherein the number of the laser grooves of the marking laser line is smaller than the number of the laser grooves of the non-marking laser line, and a difference between the number of the laser grooves of the marking laser line and the non-marking laser line in an extending direction of the laser line is 12 to 24.
3. The solar cell of claim 1, wherein the first end of the marking laser line is not flush with the first end of the non-marking laser line, the second end of the marking laser line is not flush with the second end of the non-marking laser line, and a length of the marking laser line is equal to a length of the non-marking laser line.
4. The solar cell of claim 1, wherein the substrate comprises first and second adjacent regions;
a portion of the laser lines are located within the first region, and the laser lines within the first region include at least one of the marking laser lines and at least one of the non-marking laser lines;
a portion of the laser lines are located within the second region, and the laser lines within the second region include at least one of the marking laser lines and at least one of the non-marking laser lines;
within the first region, 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 a width of the marking laser line is different from a width of the non-marking laser line;
Within the second region, 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 a width of the marking laser line is different from a width of the non-marking laser line.
5. The solar cell of claim 4, wherein the number of laser lines is an even number.
6. The solar cell according to claim 1, wherein an electrode is provided on the laser line; the length of the electrode is the same as the length of the laser line in the extending direction of the laser line.
7. A solar cell module, comprising: a plurality of solar cells according to any one of claims 1-6, wherein marking laser lines of the solar cells produced by different laser grooving apparatuses are arranged at different positions in a direction perpendicular to an extending direction of the laser lines.
8. A method for manufacturing a solar cell, comprising:
providing a plurality of substrates;
providing a plurality of laser grooving devices, and carrying out 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 plurality of laser lines comprise at least one marking laser line and at least one non-marking laser line, and the marking laser lines are 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 has 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;
wherein, the arrangement positions of the marking laser lines corresponding to different laser grooving devices 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 extending direction perpendicular to the laser line is different from the width of the non-marking laser line.
9. The method of manufacturing a solar cell according to claim 8, further comprising the step of, after forming the laser line: checking the quality of the product; if the product quality is unqualified, searching the marking laser line; determining the corresponding laser grooving device by the arrangement position of the marking laser line in the extending direction perpendicular to the laser line; checking the production condition of the laser line of the laser grooving apparatus.
10. The method of manufacturing a solar cell according to claim 9, further comprising the step of, before performing the product quality inspection: forming an electrode on the laser line, wherein the production equipment of the electrode and the laser grooving equipment are integrated in the same machine; during the product quality inspection, the production condition of the production equipment of the electrode is also inspected.
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CN107425080A (en) * 2017-03-03 2017-12-01 广东爱康太阳能科技有限公司 P-type PERC double-sided solar batteries and its component, system and preparation method
CN206921831U (en) * 2017-03-03 2018-01-23 广东爱旭科技股份有限公司 P-type PERC double-sided solar batteries and its component, system
CN109065658A (en) * 2018-07-12 2018-12-21 浙江爱旭太阳能科技有限公司 A kind of p-type SE-PERC double-sided solar battery and preparation method thereof

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