CN109524503B - Drilling method for electrode leading-out hole of photovoltaic cell - Google Patents
Drilling method for electrode leading-out hole of photovoltaic cell Download PDFInfo
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- CN109524503B CN109524503B CN201811217093.8A CN201811217093A CN109524503B CN 109524503 B CN109524503 B CN 109524503B CN 201811217093 A CN201811217093 A CN 201811217093A CN 109524503 B CN109524503 B CN 109524503B
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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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/186—Particular post-treatment for the devices, e.g. annealing, impurity gettering, short-circuit elimination, recrystallisation
-
- 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
- H01L31/02002—Arrangements for conducting electric current to or from the device in operations
- H01L31/02005—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
- H01L31/02008—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
- H01L31/02013—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules comprising output lead wires elements
-
- 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 invention relates to a drilling method of an electrode leading-out hole of a photovoltaic cell; the method comprises the following steps: s1, selecting a glass layer provided with an electrode lead-out hole from the glass layers of the photovoltaic cells as a setting layer and determining the setting position of the electrode lead-out hole; s2, determining the parameters of the electrode lead-out hole according to the thickness of the setting layer; and S3, drilling by adopting a double-sided drilling process according to the arrangement position of the electrode lead-out hole and the parameters of the electrode lead-out hole. Respectively selecting a setting layer and a position, determining the parameters of an electrode leading-out hole, and drilling by adopting a double-sided drilling process; the position of the motor lead-out hole ensures the lead-out of the positive electrode and the negative electrode inside, does not influence the strength of a glass layer, is convenient for the connection of external equipment, and does not influence the lighting rate of the battery; the double-sided drilling process further reduces the damage to the glass layer in the drilling process and avoids the glass from cracking or breaking in the drilling process.
Description
Technical Field
The invention relates to the technical field of photovoltaic cells, in particular to a drilling method of an electrode leading-out hole of a photovoltaic cell.
Background
Solar cells are receiving more and more attention due to their characteristics of high conversion efficiency, low raw material consumption, low production cost, and the like. At present, flexible substrate materials are mostly adopted in industrial production, such as stainless steel coils are used for producing films. In order to expand the application field of the membrane module, people begin to turn the center of gravity to the production of the membrane module by using a rigid substrate such as glass and the like so as to meet the application requirements of special fields such as BIPV, roof power generation and the like.
At present, the series and parallel connection of the cells in the industry is realized by adopting an internal electrode connection technology for a thin-film solar cell module with a glass substrate, which requires that the positive electrode and the negative electrode of the cell module are led out in a certain way for subsequent production process. The leading-out of the positive electrode and the negative electrode of the battery pack is realized by means of a drilling process, however, if the drilling technology in other industries is directly applied to the production of the photovoltaic industry, glass fragments and edge breakage can be caused, the conversion efficiency and the service life of a product can be reduced, and even scrapping can be caused.
Therefore, it is desirable to provide a method for drilling electrode lead-out holes of photovoltaic cells to solve the deficiencies of the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a drilling method of an electrode leading-out hole of a photovoltaic cell.
The invention provides a drilling method of an electrode leading-out hole of a photovoltaic cell; the method comprises the following steps:
s1, selecting a glass layer provided with an electrode lead-out hole from the glass layers of the photovoltaic cells as a setting layer and determining the setting position of the electrode lead-out hole;
s2, determining the parameters of the electrode lead-out hole according to the thickness of the setting layer;
and S3, drilling by adopting a double-sided drilling process according to the arrangement position of the electrode lead-out hole and the parameters of the electrode lead-out hole.
Further, the electrode leading-out hole comprises a positive electrode leading-out hole and a negative electrode leading-out hole;
the glass layer of the photovoltaic cell comprises:
the packaging structure comprises a float glass substrate deposited with a thin film and tempered glass used for packaging, wherein the float glass substrate is attached to the tempered glass.
Further, the selecting, as a setting layer, a glass layer provided with an electrode lead-out hole from among glass layers of the photovoltaic cell includes: selecting a float glass substrate as a setting layer;
the determining of the arrangement position of the electrode leading-out hole comprises: the electrode leading-out hole is arranged at the edge of the float glass substrate, and the electrode leading-out hole is arranged at the position where the film is not deposited.
Further, the determining the arrangement position of the electrode lead-out hole further comprises:
the axis of the positive electrode lead-out hole is parallel to the axis of the negative electrode lead-out hole;
the distance between the axis of the positive electrode lead-out hole and the axis of the negative electrode lead-out hole is 10-50 mm.
Further, the determining the parameter of the electrode lead-out hole according to the thickness of the setting layer comprises:
d 2 ≥2d 3 ；
d is said 2 The vertical distance between the inner wall of the electrode leading-out hole and the edge of the float glass substrate close to the electrode leading-out hole is the nearest vertical distance; d 3 Is the thickness of the float glass substrate.
Further, the determining the parameters of the electrode lead-out hole according to the thickness of the setting layer further comprises:
the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are equal; the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are larger than the thickness of the float glass substrate.
Further, the drilling by adopting a double-sided drilling process according to the setting position of the electrode lead-out hole and the parameters of the electrode lead-out hole comprises the following steps:
selecting a drill bit with a radius matched with that of the electrode lead-out hole;
selecting a drill made of tungsten steel and matched with the float glass substrate;
double-sided drilling is performed with a drilling apparatus having two coaxially opposed drill bits.
Further, the selecting a drill bit having a radius matching a radius of the electrode lead-out hole includes:
respectively selecting a first drill bit and a second drill bit; the radius of the first drill is equal to that of the electrode leading-out hole, and the radius of the second drill is 0.05-0.15mm larger than that of the electrode leading-out hole.
Further, the double-sided drilling using the drilling apparatus having two coaxially opposite drill bits includes:
firstly, drilling by adopting a second drill, wherein the drilling depth is less than the thickness of the float glass substrate;
and drilling by using a first drill, wherein the drilling depth is greater than the thickness of the float glass substrate.
Furthermore, the drilling equipment is provided with a cooling assembly and a dust suction assembly around the drill bit respectively.
Compared with the closest prior art, the technical scheme of the invention has the following advantages:
according to the drilling method for the electrode leading-out hole of the photovoltaic cell, provided by the technical scheme, the setting layer and the position are respectively selected, the parameters of the electrode leading-out hole are determined according to the thickness of the setting layer, and then the hole is drilled by adopting a double-sided drilling process; the leading-out hole position of the motor ensures the leading-out of the positive electrode and the negative electrode in the battery, does not influence the strength of the glass layer, is convenient for the connection of external equipment, and does not influence the daylighting rate of the battery; the double-sided drilling process further reduces the damage to the glass layer in the drilling process and avoids the glass from cracking or breaking in the drilling process.
Drawings
FIG. 1 is a cross-sectional view of a photovoltaic cell in an embodiment of the present invention;
FIG. 2 is a schematic view showing the position of an electrode lead-out hole in the embodiment of the present invention;
FIG. 3 is a schematic illustration of a double-sided drilling process in an embodiment of the invention;
fig. 4 is a sectional view of an electrode lead-out hole in an embodiment of the present invention.
Wherein, 1-float glass substrate; 2-toughened glass; 3-a film; 4-positive electrode; 5-negative pole; 6-electrode leading-out hole; 7-drilling equipment; 8-a drill bit; 9-a cooling assembly; 10-a dust extraction assembly; 11-a second opening; 12-a first opening; 13-axis.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 4, the present invention provides a method of drilling an electrode lead-out hole of a photovoltaic cell; the method comprises the following steps:
s1, selecting the glass layer provided with the electrode lead-out hole 6 from the glass layers of the photovoltaic cells as a setting layer and determining the setting position of the electrode lead-out hole 6;
s2, determining the parameters of the electrode lead-out hole 6 according to the thickness of the setting layer;
and S3, drilling by adopting a double-sided drilling process according to the arrangement position of the electrode lead-out hole 6 and the parameters of the electrode lead-out hole 6.
In the present embodiment, the electrode lead-out hole 6 includes a positive electrode lead-out hole and a negative electrode lead-out hole.
In this embodiment, the photovoltaic cell is a copper indium gallium selenide thin-film solar cell, a crystalline silicon cell, a HIT cell, a perovskite cell, or a gallium arsenide cell, and the glass layer of the cell includes:
the packaging structure comprises a float glass substrate 1 deposited with a thin film 3 and toughened glass 2 used for packaging, wherein the float glass substrate 1 is attached to the toughened glass 2;
the Mo layer at the bottom layer in the film is made of an anode 4, the TCO layer at the top layer is made of a cathode 5, one end of a copper belt or an aluminum belt is adhered to the anode and cathode materials of the battery in a certain adhesion mode, and the other end of the copper belt or the aluminum belt is led out through an anode leading-out hole and a cathode leading-out hole.
The step of selecting the glass layer provided with the electrode lead-out hole 6 from the glass layers of the photovoltaic cells as a setting layer comprises the following steps: selecting a float glass substrate 1 as a setting layer;
the thickness and the hardness of the toughened glass 2 are larger than those of the common float glass substrate 1, so that the electrode leading-out holes 6 are formed in the float glass substrate 1, and the drilling difficulty is reduced; moreover, holes are drilled on the toughened glass 2, and after subsequent devices such as a lead wire, a junction box and the like are connected, a part of sunlight can be shielded, so that the light receiving surface of the whole assembly is reduced, and the power generation efficiency of the battery can be influenced, and the defects can be avoided by arranging the electrode lead-out holes 6 on the float glass substrate 1; and the installation beauty of the subsequent lead wires, the junction box and the like is greatly improved by arranging the electrode leading-out hole 6 on the float glass substrate 1.
The determining of the arrangement position of the electrode lead-out hole 6 includes: the position of the electrode leading-out hole 6 is arranged at the edge of the float glass substrate 1, and the position of the electrode leading-out hole 6 is arranged at the position where the thin film 3 is not deposited; the length, width and height of the float glass substrate 1 in the embodiment are 1500mm, 1000mm and 3mm respectively; the positive electrode lead-out hole and the negative electrode lead-out hole can be arranged on the long edge and the short edge, and can be determined according to factors such as the size of a polar connection circuit and production equipment in the battery, and the positive electrode lead-out hole and the negative electrode lead-out hole are arranged on the position close to the short edge.
The determining of the arrangement position of the electrode lead-out hole 6 further includes:
the axis of the positive electrode lead-out hole is parallel to the axis of the negative electrode lead-out hole;
the distance between the axis of the positive electrode lead-out hole and the axis of the negative electrode lead-out hole is 10-50 mm.
If the distance between the axes of the positive electrode lead-out hole and the negative electrode lead-out hole is too small, the possibility of contact between the two electrodes is easily caused, and the short circuit of the battery can be caused; if the distance between the axes of the positive electrode lead-out hole and the negative electrode lead-out hole is too large, the subsequent junction box installation is easy to cause certain difficulty, and if the size of the junction box is larger, the use amount of filling glue of the junction box is more, and the cost is increased, so that the distance can be reasonably determined from 10-50mm according to the radius of the electrode lead-out hole 6.
The determining of the parameters of the electrode lead-out hole 6 according to the thickness of the setting layer includes:
d 2 ≥2d 3 ；
d is said 2 The vertical distance between the inner wall of the electrode lead-out hole 6 and the edge of the float glass substrate 1 close to the electrode lead-out hole is the nearest vertical distance; d 3 Is the thickness of the float glass substrate 1.
The vertical distance d between the inner wall of the electrode lead-out hole 6 and the edge of the float glass 1 adjacent to the electrode lead-out hole 2 Too small can easily cause edge breakage and breakage of glass in the drilling process, the whole product can be scrapped, and d 2 ≥2d 3 The above-mentioned dangerous situation can be effectively avoided.
The determining the parameters of the electrode leading-out hole 6 according to the thickness of the setting layer further comprises:
the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are equal; the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are larger than the thickness of the float glass substrate 1.
The diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are larger than the thickness of the float glass substrate, so that a series of fine cracks caused by the fact that a drill bit directly drills through the whole glass can be effectively avoided, and the stability of the aperture can be avoided.
The drilling by adopting a double-sided drilling process according to the setting position of the electrode leading-out hole 6 and the parameters of the electrode leading-out hole 6 comprises the following steps:
selecting a drill bit 8 with a radius matching the radius of the electrode lead-out hole 6;
selecting a drill 8 with the material matched with that of the float glass substrate 1;
double-sided drilling is performed with a drilling device 7 provided with two coaxially opposite drill bits 8.
The drill bit 8 with the selected radius matched with the radius of the electrode leading-out hole 6 comprises:
respectively selecting a first drill bit and a second drill bit; the radius of the first drill is equal to that of the electrode leading-out hole 6, and the radius of the second drill is 0.05-0.15mm larger than that of the electrode leading-out hole 6; the radius of the electrode lead-out hole 6 and the first drill in this embodiment is 2.0mm, and the radius of the second drill is 2.1 mm.
The first drill bit and the second drill bit are concentric, so that the axes drilled on two sides are consistent after double-sided drilling is ensured, the condition that the filled hole cannot be filled due to axial deviation is effectively avoided, and the sealing performance of the battery is greatly improved.
The drill 8, which selects a material to match with the material of the float glass substrate 1, includes:
a drill 8 of tungsten steel is selected.
The tungsten steel has high wear resistance, low price and stable performance; the problems of glass cracking, high cost, difficult later maintenance and glass melting deformation in laser drilling can be effectively avoided.
The double-sided drilling with the drilling device 7 provided with two coaxially opposite drill bits 8 comprises:
firstly, drilling by adopting a second drill, wherein the drilling depth is less than the thickness of the float glass substrate 1;
and drilling by using a first drill, wherein the drilling depth is greater than the thickness of the float glass substrate 1.
Regardless of which side of the glass substrate is drilled, the obtained aperture edge cannot be guaranteed to be clean and smooth as long as the one-side drilling mode is adopted, which is related to the effect of the subsequent process. Drilling one side of the glass will destroy the other side of the glass, and the aperture cannot form a good funnel shape. The hole diameter with an irregular shape can cause that the local part can not be filled in the subsequent hole filling process to generate bubbles, thereby influencing the service life of the whole assembly; the double-sided drilling adopting the invention can respectively form better funnel-shaped openings on two sides, namely the second opening 11 formed by the drilling process of the second drill bit and the first opening 12 formed by the drilling process of the first drill bit.
The drilling device 7 is provided with a cooling assembly 9 and a dust suction assembly 10 around the drill bit 8.
In the drilling process, cooling water can be erupted to cooling module 9 and the drilling position is cooled down, avoids the heat that produces in the twinkling of an eye to cause the glass breakage, and dust absorption module 10 can in time absorb away the glass piece that the drilling produced.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.
For a software implementation, the techniques described herein may be implemented by means of units performing the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be substantially or partially contributed to by the prior art, or may be embodied in a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media capable of storing program codes.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A drilling method of an electrode lead-out hole of a photovoltaic cell; characterized in that the method comprises the following steps:
s1, selecting a glass layer provided with an electrode lead-out hole (6) from the glass layers of the photovoltaic cells as a setting layer and determining the setting position of the electrode lead-out hole (6);
s2, determining the parameters of the electrode lead-out hole (6) according to the thickness of the setting layer;
s3, drilling by adopting a double-sided drilling process according to the setting position of the electrode leading-out hole (6) and the parameters of the electrode leading-out hole (6);
the electrode leading-out hole (6) comprises a positive electrode leading-out hole and a negative electrode leading-out hole;
the glass layer of the photovoltaic cell comprises:
the packaging structure comprises a float glass substrate (1) deposited with a thin film and tempered glass (2) used for packaging, wherein the float glass substrate (1) is attached to the tempered glass (2);
the step of selecting the glass layer provided with the electrode lead-out hole (6) from the glass layers of the photovoltaic cells as a setting layer comprises the following steps: selecting a float glass substrate (1) as a setting layer;
the determining of the arrangement position of the electrode leading-out hole (6) comprises: the position of the electrode leading-out hole (6) is arranged at the edge of the float glass substrate (1), and the position of the electrode leading-out hole (6) is arranged at the position where a film is not deposited;
the determining of the arrangement position of the electrode leading-out hole (6) further comprises:
the axial line of the positive electrode lead-out hole is parallel to the axial line of the negative electrode lead-out hole;
the distance between the axis of the positive electrode lead-out hole and the axis of the negative electrode lead-out hole is 10-50 mm;
the determining of the parameters of the electrode lead-out hole (6) according to the thickness of the setting layer comprises:
d 2 ≥2d 3 ；
d is 2 The vertical distance between the inner wall of the electrode lead-out hole (6) and the edge of the float glass substrate (1) close to the electrode lead-out hole is the nearest; d 3 Is the thickness of the float glass substrate (1);
the determining of the parameters of the electrode lead-out hole (6) according to the thickness of the setting layer further comprises:
the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are equal; the diameters of the positive electrode lead-out hole and the negative electrode lead-out hole are larger than the thickness of the float glass substrate (1);
the drilling by adopting a double-sided drilling process according to the setting position of the electrode leading-out hole (6) and the parameters of the electrode leading-out hole (6) comprises the following steps:
selecting a drill bit (8) with a radius matched with that of the electrode leading-out hole (6);
selecting a drill bit (8) made of tungsten steel and the material of which is matched with that of the float glass substrate (1);
double-sided drilling is carried out by adopting drilling equipment (7) with two coaxial opposite drill bits (8);
the drill (8) with the selected radius matched with the radius of the electrode leading-out hole (6) comprises:
respectively selecting a first drill bit and a second drill bit; the radius of the first drill is equal to that of the electrode leading-out hole (6), and the radius of the second drill is 0.05-0.15mm larger than that of the electrode leading-out hole (6).
2. A method of drilling an electrode lead-out hole of a photovoltaic cell according to claim 1; characterized in that said double-sided drilling with a drilling device (7) provided with two coaxially opposite drill bits (8) comprises:
firstly, drilling by adopting a second drill, wherein the drilling depth is less than the thickness of the float glass substrate (1);
and drilling by using a first drill, wherein the drilling depth is greater than the thickness of the float glass substrate (1).
3. A method of drilling an electrode lead-out hole of a photovoltaic cell according to claim 1; the drilling equipment (7) is characterized in that a cooling assembly (9) and a dust suction assembly (10) are respectively arranged around the drill bit (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217093.8A CN109524503B (en) | 2018-10-18 | 2018-10-18 | Drilling method for electrode leading-out hole of photovoltaic cell |
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| CN101661964B (en) * | 2008-08-27 | 2012-02-22 | 比亚迪股份有限公司 | Solar module and manufacturing method thereof |
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