KR20140080834A - Electrode wire and solar cell module having the same - Google Patents

Electrode wire and solar cell module having the same Download PDF

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Publication number
KR20140080834A
KR20140080834A KR1020120149082A KR20120149082A KR20140080834A KR 20140080834 A KR20140080834 A KR 20140080834A KR 1020120149082 A KR1020120149082 A KR 1020120149082A KR 20120149082 A KR20120149082 A KR 20120149082A KR 20140080834 A KR20140080834 A KR 20140080834A
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South Korea
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pair
optical element
reflection
incident
portions
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KR1020120149082A
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Korean (ko)
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KR101971292B1 (en
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곽일조
김상겸
김정익
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엘에스전선 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/20—Optical components
    • H02S40/22—Light-reflecting or light-concentrating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Abstract

The present invention relates to an electrode wire and a solar cell module having the same. According to the present invention, the electrode wire is configured to comprise at least one inclined portion to be inclined at a predetermined angle to a line perpendicular to an optical element to be re-incident to the optical element if the incident light is reflected; and a first coupling portion and a second coupling portion provided respectively at the top and bottom of the inclined portion to maintain coupling force with the optical element.

Description

Electrode wire and a solar cell module having the electrode wire.

The present invention relates to an electrode wire and a solar cell module having the same, and more particularly, to an electrode wire capable of increasing the amount of light incident on the solar cell module and sufficiently maintaining the bonding force with the optical device of the solar cell module .

Recently, there has been a rapid increase in demand for electricity. In addition to the way electricity is produced by conventional fossil fuels such as coal and oil, electricity production methods utilizing renewable energy such as photovoltaic, bio, wind, geothermal, . Among these, the development of a solar cell module which converts solar energy into electric energy is actively developed. The photovoltaic power generation system using the solar cell module has no mechanical or chemical action in the process of converting solar energy into electric energy, so the structure of the system is simple and maintenance is almost not required. In addition, once installed, the photovoltaic system has a long life span, is safe, and is environmentally friendly.

The solar cell module includes an optical device to which sunlight is incident, and when receiving sunlight, it generates electricity using the characteristics of an optical device that generates electricity by photoelectric effect. However, in recent years, a lot of studies have been actively conducted to improve the efficiency of producing electricity of the solar cell module. For example, studies have been actively conducted to lower the reflectivity of sunlight incident on an optical element, or to increase the incident rate of sunlight incident on an optical element even in the case of an optical element having the same size. For example, an electrode wire connected to the surface of an optical device and transmitting electric power covers the surface of the optical device, so that the light incident on the electrode wire is reflected and is not incident on the optical device. Therefore, the electrode wire reduces the amount of light incident on the optical element, thereby reducing the incident rate of the sunlight.

In order to solve the above problems, US Publication No. 2007-0125415 (hereinafter referred to as "Prior Art Document 1") discloses an electrode wire having an inclined portion inclined at a predetermined angle. The inclined portion of the electrode wire causes the reflected light to be incident on the optical element again by total reflection, thereby increasing the incident rate of sunlight. However, in general, the electrode wires are alternately connected to the upper and lower surfaces of adjacent optical elements for series connection. The shape of the upper portion of the electrode wire of the prior art document 1 has a concavo-convex shape in which the inclined portions on both sides abut. Therefore, although the electrode wire of the prior art document 1 can be bonded to the optical element by soldering at the lower surface, it is in line contact with the optical element at the upper surface, so that bonding by the conventional soldering is impossible, A bonding technique is required.

In addition, according to U.S. Patent No. 6,323,415 (hereinafter referred to as 'Prior Art 2'), light is reflected by a separate 'light reflecting member' connecting an optical element, and the reflected light is reflected back to the optical element Thereby causing the light to enter. However, the light reflecting member only starts to be incident on the optical element again by the reflection / total reflection of light, and the connection between the electrode wire and the optical element for transmitting the power produced by the optical element is not disclosed at all.

Further, in the U.S. Patent Publication No. 5,554,229 (hereinafter referred to as 'Prior Art 3') and U.S. Patent No. 4,235,643 (hereinafter referred to as 'Prior Art Document 4'), incident light enters the optical device . However, since the prior art 3 and the prior art document 4 reflect light using a separate member rather than an electrode wire, there is a problem that cost and time are increased due to an increase in the process of manufacturing the solar cell module.

It is an object of the present invention to provide an electrode wire capable of increasing the amount of light incident on an optical element and capable of maintaining a coupling force with the optical element at a predetermined level or more.

It is an object of the present invention to provide an electrode wire for a solar cell module, which is provided adjacent to a cover for transmitting power generated in an optical device and protecting the optical device, in which, when incident light is reflected, At least one inclined portion inclined at a predetermined angle with a line perpendicular to the optical element so as to be incident on the optical element again and first and second engaging portions provided at upper and lower portions of the inclined portion to maintain a coupling force with the optical element, And an electrode wire for a solar cell module.

Here, the angle of the inclined portion may be determined so that the light reflected from the inclined portion is totally reflected by the cover portion and then incident on the optical element again, or the light reflected from the inclined portion may be directly incident on the optical element. For example, the angle of the slope may be greater than 0 degrees and less than 44 degrees, or greater than 46 degrees and less than 69 degrees.

The inclined portion may be provided on both sides so as to connect the first engaging portion and the second engaging portion. Furthermore, a vertical portion connecting the inclined portion and the second engaging portion may be further provided.

The ratio (L1 / L2) of the widths of the first and second engaging portions may be approximately 50% to 80%.

The inclined portion may include a pair of upper inclined portions connected to both ends of the first engaging portion and a pair of lower inclined portions connected to both ends of the second engaging portion, Can be symmetrically provided and connected to the lower inclined portion of the pair.

The inclined portion may include at least one of a total reflection portion provided to be inclined so that the reflected light is incident on the optical element again by the total reflection of the cover portion and a reflective incidence portion inclined to be incident on the optical element, . ≪ / RTI > In this case, the angle of the total reflection part is not less than 46 ° and not more than 69 °, and the angle of the reflection incidence part may be more than 0 ° and not more than 44 °.

The inclined portion may include a pair of total reflection portions connected to both ends of the first coupling portion and a pair of reflection incidence portions connected to the pair of total reflection portions. Specifically, the inclined portion includes a pair of upper total reflection portions connected to both ends of the first engagement portion, a pair of upper reflection incidence portions connected to the pair of upper total reflection portions, And a pair of lower reflection incidence portions connected to the pair of lower total reflection portions, wherein the pair of upper reflection incidence portions and the lower reflection incidence portions are provided symmetrically with respect to each other Can be connected to each other.

According to another aspect of the present invention, there is provided an optical device including: an optical element for generating light by receiving light; a cover portion for allowing light to enter the optical element and protecting the optical element; A slope part inclined at a predetermined angle with a line perpendicular to the optical element so as to be incident on the optical element again when the incident light is reflected and a slope part provided at an upper portion and a lower part of the slope part, And an electrode wire having a coupling portion and a second coupling portion.

It is another object of the present invention to provide an electrode wire for a solar cell module which is provided adjacent to a cover for transmitting power generated in an optical device and protecting the optical device, A total reflection part inclined with a line perpendicular to the optical element to be incident on the optical element by total reflection with the cover part when the incident light is reflected; And an inclined portion having at least one of a reflective portion and a reflection incidence portion inclined with respect to a line perpendicular to the surface of the electrode wire.

Here, the angle of the total reflection part is not less than 46 ° and not more than 69 °, and the angle of the reflection incidence part may be more than 0 ° and not more than 44 °.

The coupling unit may include a first coupling unit and a second coupling unit, which are respectively provided at upper and lower portions of the inclined portion to maintain a coupling force with the optical device. In this case, the ratio (L1 / L2) of the widths of the first and second engagement portions may be approximately 50% to 80%.

The inclined portion may include a pair of total reflection portions connected to both ends of the first coupling portion and a pair of reflection incidence portions connected to the pair of total reflection portions. For example, the inclined portion may include a pair of upper total reflection portions connected to both ends of the first engagement portion, a pair of upper reflection incidence portions connected to the pair of upper total reflection portions, And a pair of lower reflection incidence portions connected to the pair of lower total reflection portions, wherein the pair of upper reflection incidence portions and the lower reflection incidence portions are symmetrically provided And can be connected to each other.

It is another object of the present invention to provide an optical device that generates electric power, a cover unit that allows light to be incident on the optical device and protects the optical device, and electric power generated by the optical device, A total reflection part provided inclinedly with a line perpendicular to the optical element to be incident on the optical element by total reflection with the cover part; and a line perpendicular to the optical element so that the reflected light is directly incident on the optical element, And an electrode wire having an inclined portion having at least one of reflection incidence portions and an engaging portion to be coupled with the optical element.

According to the electrode wire of the present invention having the above-described structure, the inclined portion reflects light and re-enters by total reflection, and has a first coupling portion and a second coupling portion connected to the optical device, So that it can be firmly connected to the optical element. That is, it is possible to adjust the ratio of the widths of the first coupling portion and the second coupling portion to be combined with the optical element at a predetermined level or more while increasing the incident rate of light by the inclined portion.

Further, according to the present invention, there is provided a light emitting device including: a path that is incident on an optical element to avoid an electrode wire; a path that is reflected from the electrode wire and totally reflected back from the cover portion to be incident on the optical element; The incident rate of light can be increased. In other words, the light guide plate is provided with an inclined portion so that light is incident on an optical element by avoiding an inclined portion, and light reflected by the total reflection portion is incident again by total reflection, and light reflected by the reflection incidence portion is incident again, .

1 is a schematic view showing an operation principle of a solar cell module,
2 is an exploded perspective view of a solar cell module according to an embodiment,
3 is a cross-sectional view of a conventional electrode wire,
FIG. 4 is a cross-sectional view of an electrode wire according to an embodiment of the present invention, FIG.
FIG. 5 is a schematic view showing a path through which light is incident when a conventional electrode wire and an electrode wire according to an embodiment of the present invention are provided;
FIGS. 6 to 8 are schematic views showing the path of light according to the angle change of the inclined portion,
FIG. 9 is a cross-sectional view showing the structure of an electrode wire according to an embodiment of the present invention,
10 is a graph showing the rising efficiency of the solar light incidence rate according to the inclination angle of the electrode wire,
11 to 14 are sectional views showing electrode wires according to other embodiments.

Hereinafter, an electrode wire and a solar cell module according to various embodiments of the present invention will be described with reference to the drawings. First, a basic configuration of a solar cell module will be described, and then various embodiments of electrode wires applicable to such a solar cell module will be described.

FIG. 1 is a schematic view schematically illustrating a process in which a solar cell module receives sunlight to generate electricity.

Referring to FIG. 1, a solar cell is defined as a cell that generates electricity by photoelectric effect when it receives sunlight. As shown in FIG. 1, when the N layer 3 and the P layer 5 are bonded to each other and sunlight is incident on the optical element 32 having the PN junction, a pair of holes is formed. At this time, the electrons move to the N layer 3 and the holes move to the P layer 5 by the electric field generated at the PN junction. Therefore, an electromotive force is generated between the P layer 5 and the N layer 3, and a current flows when the load is connected to the electrodes at both ends. A reference numeral '1', which is not described in the drawings, corresponds to an antireflection film that prevents sunlight from being reflected. In Fig. 1, the electrode wire 34 for the solar cell module is configured to transmit the power generated in the optical element 32. Fig. For example, the electrode wire 34 is shown on the top surface of the optical element 32 and electrically connected to the N layer 3, but is not limited thereto. That is, the electrode wires 34 are alternately connected to the upper and lower surfaces of the adjacent optical elements 32 for series connection. Accordingly, the electrode wire 34 serves as a coupling portion connecting both the upper surface and the lower surface of the electrode wire 34 with the optical element 32.

FIG. 2 is a perspective view of an embodiment of a solar cell module 100 operated in accordance with the above-described principle.

2, the solar cell module 100 includes a reinforcing glass 10, an EVA 20, an optical unit 30, a filler 20, A back sheet 50 may be provided. Here, the components are surrounded by a frame 22. The configuration of the solar cell module 100 may include additional components or omit some of the components with the optical device unit 30 as a basic configuration.

The tempered glass 10 is provided with a surface treatment for lowering light reflection loss while having high light transmittance. In addition, it is desirable to have a sufficient wind-resistance performance capable of enduring even at a wind speed higher than a predetermined level so as to withstand a relatively strong wind, and it is manufactured according to the safety glass standard so that it can be safely broken into several pieces even if breakage occurs. This tempered glass 10 may be made of, for example, low iron tempered glass.

On the other hand, the filler (EVA) 20 serves to protect the optical element unit 30 having a relatively low durability. And is provided on the front and rear surfaces of the optical element unit 30 for this purpose. Specifically, the front filler 20 is inserted between the tempered glass 10 and the optical element unit 30, and the rear filler 20 is inserted between the optical element unit 30 and the back sheet 50.

In this specification, a combination of the tempered glass 10 and the filler 20 is defined as a cover portion 40. [ That is, the cover unit 40 allows the light to be incident on the optical element unit 30, and further protects the optical element unit 30. On the other hand, the combination of the cover part 40 is merely described as an example, and it is of course possible to add other components or to omit either the reinforcing glass or the filler. The above-described electrode wire 34 is provided adjacent to the cover portion 40.

On the other hand, the back sheet 50 is provided on the rear surface of the solar cell module 100 to prevent contamination of moisture or the like penetrating from the back surface and protect the solar cell module 100 from the external environment.

Hereinafter, various embodiments of electrode wires used in the solar cell module 100 having the above-described configuration will be described.

3 is a cross-sectional view showing an electrode wire 34 according to a conventional configuration.

Referring to FIG. 3, the electrode wire 34 includes a conductor 36 provided therein and a solder 38 coated on the outside of the conductor 36. The conductor 36 serves to transmit the electric power generated in the optical device, and thus may be made of a general conductive metal such as copper or aluminum. For example, copper having a high electrical conductivity is widely used, and OFC (Oxygen-Free Copper) or TPC (Tough-Pitch Copper) having a low oxygen content is generally used.

The solder 38 coated on the surface of the conductor 36 is used for bonding the electrode wire 34 and the optical device 32 so that a Sn-based alloy is often used. For example, a tin-lead (Sn-Pb) alloy having a high melting point and favorable plating is often used. The solder 38 may have a thickness of about 10 to 40 [micro] m for smooth bonding with the optical device.

However, the electrode wire 34 according to the conventional structure as shown in FIG. 3 has a rectangular cross-section as shown in the drawing. Accordingly, the incident area of light is reduced by the area of the electrode wire 34, and the incident rate of light is reduced. Hereinafter, a structure of an electrode wire for solving the above problems will be described with reference to the drawings.

4 is a cross-sectional view illustrating the structure of an electrode wire according to an embodiment of the present invention.

Referring to FIG. 4, the electrode wire 200 includes a conductor 205 provided therein and a solder 300 coated on the surface of the conductor 205. The material of the conductor and the solder is similar to the description of FIG. 3 described above, so repetitive description will be omitted. The electrode wire 200 according to the present embodiment is provided with the inclined portion 220 on the side surface. Since the inclined portion 220 is not in direct contact with the optical element 32, The solder 300 to be coated may have a thickness of about 10 mu m or less.

The electrode wire 200 according to the present embodiment includes at least one inclined portion 220 which is inclined at a predetermined angle with a line perpendicular to the optical element 32 so as to be incident on the optical element 32 again when incident light is reflected The first and second coupling parts 210 and 230 are respectively provided on the upper and lower parts of the inclined part 220 to maintain the coupling force with the optical element 32 and the optical element 32.

At least one inclined portion 220 is provided on a side surface of the electrode wire 200 so that the light reflected by the inclined portion 220 is incident on the optical element 32 again. When the electrode wires 200 are alternately connected to the upper surface and the lower surface of the adjacent optical element 32 by providing the first and second coupling portions 210 and 230 on the upper and lower portions of the inclined portion 220, As shown in FIG. For example, the inclined portion 220 may be provided on both sides so as to connect the first engaging portion 210 and the second engaging portion 230.

The electrode wire 200 may include the inclined portion 220 to increase the amount of light incident on the optical element 32 compared to the conventional electrode wire. For example, the light incident on the inclined portion may be incident on the optical element to avoid the electrode wire, or the light reflected by the inclined portion may be incident on the optical element again by the cover portion and the total reflection as described above, Light can be incident directly into the optical device. Hereinafter, the functions of the inclined portion and the engaging portion will be described in detail with reference to the drawings.

5 is a schematic view showing an incident path of light when the electrode wire of the conventional configuration and the electrode wire of the present embodiment are provided.

Referring to FIG. 5A, when the conventional electrode wire 34, that is, the rectangular electrode wire is provided, the cross-sectional area of the electrode wire 34 covers the optical element 32. Therefore, the light incident on the electrode wire 34 inclined at a predetermined angle (?) Including light incident in a direction perpendicular to the electrode wire 34 is all reflected and does not enter the optical element 32 Do not.

5 (b), the electrode wire 200 according to the present embodiment includes the inclined portion 220 connecting the first and second coupling portions 210 and 230 as described above, As shown in the drawing, and one pair is preferably provided on both sides.

Therefore, the light incident on the electrode wire 200 at a predetermined angle? 'Is incident on the optical element 32 by the inclined portion 220 while avoiding the electrode wire 200. As a result, the electrode wire 200 according to the present embodiment can increase the amount of incident light compared to the conventional electrode wire 34 having a rectangular shape.

The inclined portion 220 of the electrode wire 200 may reflect the reflected light to the optical element 32 according to an angle formed between the inclined portion 220 and the arbitrary line perpendicular to the optical element 32. FIGS. 6 to 8 are schematic views showing paths of reflected light according to the angles of the slopes 220. FIG. Hereinafter, a detailed description will be given with reference to the drawings.

Referring to FIG. 6, the angle? 1 of the inclined portion 220 may be determined such that light reflected from the inclined portion 200 is totally reflected by the cover portion 40 and is incident on the optical element 32 again. That is, when the angle of the inclined portion 220 is adjusted, when the light reflected from the inclined portion 220 is incident on the cover portion 40, the lowest total reflection angle? min . < / RTI > Therefore, the light incident on the surface of the cover portion 40 at a minimum total reflection angle? Min can be directed to the optical element 32 by total reflection and incident on the optical element 32. In this case, the minimum total reflection angle (? Min ) is determined as follows.

The cover 40 may be made of the tempered glass 10 and the filler 20 as described above. When the light passes through a medium having a high refractive index and a low refractive index, the light has a property of being totally reflected at a certain angle or more. That is, since the light reflected by the inclined portion 220 of the electrode wire passes through the cover portion 40 having a relatively high refractive index relative to air, a total reflection condition is formed. The minimum total reflection angle? Min at which total reflection occurs is obtained by the following equation (1).

Figure pat00001

The refractive index (n air ) of air is 1, and the refractive index (n glass ) of the cover portion 40 is approximately the same as the glass and the filler both at about 1.5. Therefore, the minimum total reflection angle alpha min is determined to 42 degrees. That is, when the light incident on the cover 40 is incident on the lowest total reflection angle? Min , i.e., 42 degrees or more, the light is directed to the optical element 32 again by total reflection.

The inclined portion 220 is inclined at a predetermined first angle? 1 with an arbitrary line perpendicular to the optical element 32 as shown in FIG. 6, The angle of the inclined portion 220 corresponds to 69 degrees when the light is incident at the lowest total reflection angle? Min .

7, it is assumed that the inclined portion 220 is inclined at a predetermined second angle? 2, for example, 45 degrees, with an arbitrary line perpendicular to the optical element 32. In this case, In this case, the light incident perpendicularly to the inclined portion 220 travels in parallel with the space between the optical element 32 and the cover portion 40, as shown in the figure. As a result, the light reflected by the inclined portion 220 is neither incident on the optical element 32 nor incident on the cover portion 40.

6, the first angle [theta] 1 of the inclined portion 220 for total reflection of the light reflected from the inclined portion 220 in the cover portion 40 must exceed 45 [deg.]. That is, the first angle? 1 of the inclined portion 220 has a value of 46 degrees or more and 69 degrees or less.

On the other hand, Fig. 8 shows the case where the angle [theta] 3 of the inclined portion 220 exceeds 0 [deg.] But less than 45 [deg.], That is, 44 [deg.] Or less.

Referring to FIG. 8, the light reflected by the slope 220 is directed downward as shown in the figure when the slope 220 is at a third angle? 3, And is incident on the optical element 32 immediately after reflection.

6 to 8, the angle of the inclined portion 220 is determined such that the light reflected from the inclined portion 220 is totally reflected by the cover portion 40 and is incident on the optical element 32 again Or the light reflected from the inclined portion 220 may be incident on the optical element 32 directly. For example, the angle of the inclined portion 220 may be in the range of more than 0 degrees but not more than 44 degrees (? 3), or more than 46 degrees and less than 69 degrees (? 1). Here, the angle of the angle? 1, that is, the angle of the inclined portion at which the light reflected by the inclined portion is totally reflected by the cover portion can be defined as the 'total angle of view', and the angle of the angle? 3, The angle of the inclined portion incident on the ruler can be defined as a 'reflection incident angle'. Hereinafter, a method for determining a change in incident light efficiency and a width of the first and second couplers 210 and 230 when the electrode wire 200 having the above-described configuration is provided will be described. .

Fig. 9 is a cross-sectional view showing the configuration of the electrode wire 200. Fig.

Referring to FIG. 9, the electrode wires 200 are alternately connected to the upper and lower surfaces of the adjacent optical elements 32. Accordingly, the electrode wire 200 includes a first coupling portion 210 and a second coupling portion 230 that are connected to the optical element 32 at the upper and lower portions. The first coupling portion 210 and the second coupling portion 230 are connected to each other by the inclined portion 220. Therefore, the width L2 of the second engaging part 230 is longer than the width L1 of the first engaging part 210. When the incident angle of light changes when the electrode wire 200 having the above-described configuration is provided, a change in incident efficiency according to the inclination angle of the electrode wire and a change in incident efficiency of the first and second coupling parts 210, 230) is determined as follows.

The present inventors manufactured a small solar cell module having an electrode wire 200 and fabricated a solar cell module with an electrode wire 200 in a case where the incident angle of incident light is changed (1, 2, 3, 4, 2, 3, The rising efficiency of the incident rate of light was measured while varying the inclination angle? Of the wire 200, and the experimental results are shown in Table 1 below.

Direction of light Incidence angle of light (α) The inclination angle? Lift efficiency (%) ①




0 degrees




15 degrees 0.147 25 degrees 0.256 35 degrees 0.384 45 degrees 0.548 55 degrees 0.783 65 degrees 1.175 ②, ② '




10 degrees




15 degrees 0.143 25 degrees 0.249 35 degrees 0.373 45 degrees 0.533 55 degrees 0.762 65 degrees 1.144 ③, ③ '




20 degrees




15 degrees 0.143 25 degrees 0.249 35 degrees 0.373 45 degrees 0.533 55 degrees 0.762 65 degrees -0.037 ④, ④ '




30 degrees




15 degrees 0.143 25 degrees 0.249 35 degrees 0.373 45 degrees 0.533 55 degrees -0.059 65 degrees -0.088

In the experiment according to Table 1, the thickness of the electrode wire was 0.2 mm, the width L2 of the second coupling portion 230 was 2.0 mm, the inclination angle was 15 °, 25 °, 35 °, 45 ° Deg.], 55 [deg.] And 65 [deg.], Respectively. The incident efficiency of the light incident on the optical element was compared with that of the conventional electrode wire by setting the width and the width of the optical element to which the electrode wire is connected to be 150 mm.

As shown in Table 1, when the angle of incidence of light is determined at a predetermined angle, the rising efficiency of the electrode wire according to the change of the inclination angle? Values are proportional to each other. That is, as the inclination angle? Of the electrode wire becomes larger, the value of the rising efficiency becomes larger. On the other hand, when the angle of incidence [alpha] of the light changes, the increase efficiency with respect to the inclination angle [theta] determined at a predetermined angle does not largely change. That is, it can be seen that the main factor influencing the rising efficiency of the electrode wire is not the incidence angle of light but the inclination angle? Of the electrode wire.

However, assuming that the solar cell is actually installed by installing the solar cell module, the angle of light incident on the solar cell module from the sun, that is, the angle (?) Of the light incident on the solar cell from the sun, It changes continuously. Because the position of the sun is constantly changing. Therefore, when the inclination angle &thetas; of the electrode wire is determined to be a predetermined angle, measurement of the lift efficiency using an actual solar cell module results in the same result as the graph of FIG. The graph of FIG. 10 can be determined by adding all the rising efficiencies according to the incidence angle of light when the inclination angle of the electrode wire is set to a predetermined angle in Table 1 above. For example, when the inclination angle of the electrode wire is set to 15 degrees, it is possible to determine (1 + 2 + 3 + 4 + 2 + 3 + 4) by adding all the rising efficiencies according to the incidence angle of light.

Referring to the graph of FIG. 10, it can be seen that as the inclination angle? Of the electrode wire increases up to approximately 45 degrees, the rising efficiency becomes larger, and the rising efficiency reaches the maximum between approximately 46 and 60 degrees .

6 to 8, when the angle of the inclined portion 220 of the electrode wire is theoretically determined, it is more than 0 degrees and less than 44 degrees (? 3), or more than 46 degrees and less than 69 degrees 9 to 10, when the solar cell module having the electrode wire according to the present invention is tested, the inclination angle? Of the inclined portion 220 of the electrode wire is more preferably 46 Deg.] To 60 [deg.].

Referring to FIG. 9, the width L1 of the first coupling portion 210 is smaller than the width L2 of the second coupling portion 230. Referring to FIG. In this case, it is preferable that the first coupling portion 210 maintains a contact area of a predetermined level or more so that sufficient coupling force can be sufficiently transmitted when the first coupling portion 210 is connected to the optical device 32. The present inventor has found that the width L2 of the second engaging part 230 and the width L2 of the first engaging part 210 are determined in order to determine the width L2 of the second engaging part 230 and the width L1 of the first engaging part 210 The power generated by the optical device was measured while changing the ratio of the width L1 of the optical fiber 210 to the output power of the optical device.

The inclination angle? L1 / L2 (%) Power output value (A) Conventional electrode wire 0 degrees 100 0.8130 Example 1 15 degrees 94.6 0.8219 Example 2 25 degrees 90.7 0.8260 Example 3 35 degrees 86.0 0.8325 Example 4 45 degrees 80.0 0.8366 Example 5 55 degrees 71.4 0.8358 Example 6 65 degrees 57.1 0.8171

In the experiment according to Table 2, the thickness of the electrode wire was 0.2 mm, the width L2 of the second coupling portion 230 was 2.0 mm, the inclination angle was 15 °, 25 °, 35 °, 45 ° Deg.], 55 [deg.] And 65 [deg.], Respectively. In addition, six solar cells were connected in series to fabricate a solar cell module, and the current value output through the electrode wire at 25 ° C was measured at a radiation dose (Irradiance) of 1000 W / m 2 per unit area.

As can be seen from Table 2, the electrode wire according to the embodiments of the present invention has an overall improved power output value as compared with the electrode wire according to the conventional structure. However, if the ratio of the width L1 of the first coupling portion 210 to the width L2 of the second coupling portion 230 is reduced to about 50% or less, the power output value through the electrode wire is smaller than the value And a tendency to be lowered in comparison with the case of FIG. This is because the contact area between the first coupling part 210 and the optical device is reduced as the ratio of the width L1 of the first coupling part 210 to the width L2 of the second coupling part 230 is reduced, Seems to be lowered. Accordingly, in order to maintain the coupling force between the first coupling portion 210 and the optical device and further maintain the contact area between the first coupling portion 210 and the optical device at a predetermined level or more, It is preferable that the ratio L1 / L2 of the width L1 of the second coupling portion 230 to the width L2 of the second coupling portion 230 be maintained at about 50% or more, and the increase efficiency of the incident rate of light with the change of the inclination angle? It is more preferable that the ratio (L1 / L2) of the width L1 of the first coupling portion 210 to the width L2 of the second coupling portion 230 is approximately 50% to 80%.

On the other hand, it is possible to realize various configurations of the electrode wire having the inclined portion. 11-14 illustrate electrode wires according to various embodiments.

11, the electrode wire 300 according to the present embodiment further includes vertical portions 330 and 332 connecting the inclined portions 320 and 322 and the second coupling portion 340, . Since the angle of the inclined portion is similar to the above-described embodiment, repetitive description will be omitted.

That is, the electrode wire 300 includes at least one inclined portion connected to the first coupling portion 310, preferably a pair of inclined portions 320 and 322 connected to both ends of the first coupling portion 310 And is connected to the vertical portions 330 and 332, not directly to the second coupling portion 340. The thickness of the vertical portions 330 and 332 can be determined to a predetermined value and can be variously adjusted, so that the thicknesses are not limited to specific values in the present specification. If the vertical portion is provided as described above, it is possible to manufacture the electrode wire more easily. In other words, rolling, extrusion, drawing, pressing and the like can be used to form the inclined portion on the side surface of the electrode wire on the side surface. However, considering the production rate and precision of the electrode wire, the rolling method is more advantageous. 9, the inclined portion 220 and the second coupling portion 230 are directly connected to each other. Such a structure requires a very high level of precision when manufactured by the rolling method, which makes it difficult to manufacture. On the other hand, when the slant part and the second engagement part are connected by a vertical part in the middle instead of being directly connected as shown in FIG. 11, when the rolling part is manufactured by the rolling method, Precision is required, which can bring about easiness to manufacture.

12 shows an electrode wire according to another embodiment.

Referring to FIG. 12, the electrode wire 400 according to the present embodiment may have a symmetrical structure on the upper and lower sides. The inclined portion of the electrode wire 400 includes a pair of upper inclined portions 420 and 422 connected to both ends of the first coupling portion 410 and a pair of upper inclined portions 420 and 422 connected to both ends of the second coupling portion 440. [ And lower inclined portions 430 and 432. In this case, the pair of upper inclined portions 420 and 422 may be symmetrically connected to the pair of lower inclined portions 430 and 432, respectively. Since the angles of the inclined portions are similar to those of the above-described embodiments, repetitive description will be omitted.

The electrode wire 400 according to the present embodiment has a pair of inclined portions on the upper and lower sides when the inclined portion is provided, and the inclined portions on the upper and lower sides are symmetrically provided. This configuration can be applied to the case where light is incident on both sides of the optical element 32. That is, since the upper inclined portion and the lower inclined portion are provided symmetrically with respect to each other, when light is incident toward the first coupling portion 410, the incidence rate of light is increased by the upper inclined portions 420 and 422, 2 coupling portion 440, the incidence of light can be increased by the lower inclined portions 430 and 432. [

13 shows an electrode wire according to another embodiment.

Referring to FIG. 13, the electrode wire 500 has a coupling portion to be coupled with the optical element 32. The engaging portion may include a first engaging portion 510 and a second engaging portion 520. Since the engaging portion is similar to the description of the above-described embodiments, repetitive description will be omitted.

The inclined portion includes a total reflection portion inclined with a line perpendicular to the optical element 32 so as to be incident on the optical element 32 by total reflection with the cover portion 40 when the incident light is reflected, At least one of a line perpendicular to the optical element 32 and a reflection incidence portion inclinedly provided to be directly incident on the optical element 32 is provided. For example, the inclined portion may include a pair of total reflection portions 530 and 532 connected to both ends of the first coupling portion 510, and a pair of reflection portions 530 and 532 connected to the pair of total reflection portions 530 and 532, Incident portions 540 and 542 may be provided. Here, the total reflection parts 530 and 532 may be inclined with respect to the total reflection angle? 1, and the reflection incidence parts 540 and 542 may be inclined at the reflection incidence angle? . For example, the total reflection parts 530 and 532 may be inclined at angles of 46 degrees or more and 69 degrees or less, and the reflection incidence parts 540 and 542 may be inclined at angles exceeding 0 degrees but not exceeding 44 degrees And may be inclined.

As described above, by providing both the total reflection parts 530 and 532 and the reflection incidence parts 540 and 542, it is possible to increase the efficiency of the light reflected from the side of the electrode wire to be incident on the optical element again. That is, the light reflected from the total reflection parts 530 and 532 is totally reflected by the cover part and is incident on the optical element again, and the light reflected by the reflection incidence parts 540 and 542 is directly incident on the optical element. Although it is not shown in the drawing, it is also possible that the first coupling portion and the reflection incident portion are connected, the second coupling portion and the total reflection portion are connected, and the reflection incidence portion and the total reflection portion are connected to each other.

On the other hand, Fig. 14 shows an electrode wire according to another embodiment.

When the electrode wire according to FIG. 14 is compared with the electrode wire shown in FIG. 13, the electrode wire according to FIG. 14 differs in that the upper and lower portions have symmetrical structures. Hereinafter, the differences will be mainly discussed.

14, the electrode wire 600 includes a first coupling portion 610 and a second coupling portion 640, and the first coupling portion 610 and the second coupling portion 640 are connected to each other As shown in Fig.

The inclined portion includes a pair of upper total warp portions 620 and 622 connected to both ends of the first coupling portion 610 and a pair of upper portions 620 and 622 connected to the pair of upper total warp portions 620 and 622, A pair of lower total radiating parts 650 and 652 connected to both ends of the second coupling part 640 and a pair of lower total radiating parts 650 and 652 respectively connected to the reflective incidence parts 630 and 632, And a pair of lower reflection incidence portions 660 and 662 which are connected to each other. In this case, the pair of the upper reflection incident parts 630 and 632 and the lower reflection incident parts 660 and 662 may be symmetrically connected to each other.

The electrode wire 600 according to the present embodiment is excellent in efficiency of allowing the reflected light to be incident on the optical element again when both the total reflection portion and the reflection incidence portion are provided and further the light is incident on both sides of the optical element 32 It has advantages that can be applied.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10 ... tempered glass 20 ... filler
30 ... optical element unit 40 ... cover part
50 ... back sheet 100 ... solar cell module
200 ... electrode wire 210 ... first coupling portion
220 ... inclined portion 230 ... second coupling portion

Claims (32)

An electrode wire for a solar cell module provided adjacent to a cover for transmitting power generated by an optical device and protecting the optical device,
At least one inclined portion inclined at a predetermined angle with a line perpendicular to the optical element to be incident on the optical element again when incident light is reflected,
And the first and second coupling parts are respectively provided on upper and lower sides of the inclined part to maintain a coupling force with the optical element. The method according to claim 1,
Wherein the angle of the inclined portion is determined such that light reflected from the inclined portion is totally reflected by the cover portion and then incident on the optical element again or that light reflected from the inclined portion is incident on the optical element directly Electrode wire for battery module. The method according to claim 1,
Wherein an angle of the inclined portion is more than 0 DEG and not more than 44 DEG or not more than 46 DEG and not more than 69 DEG. 3. The method of claim 2,
Wherein the inclined portion is provided on both sides so as to connect the first engaging portion and the second engaging portion. 5. The method of claim 4,
And the ratio (L1 / L2) of the widths of the first and second coupling portions is 50% to 80%. 5. The method of claim 4,
Further comprising a vertical portion connecting the inclined portion and the second coupling portion. 5. The method of claim 4,
The inclined portion
A pair of upper inclined portions connected to both ends of the first engaging portion and a pair of lower inclined portions connected to both ends of the second engaging portion, And the electrode wires are symmetrically connected to each other. The method according to claim 1,
The inclined portion
And a reflection incidence part inclined to be incident on the optical element again by the total reflection of the cover part and a reflection incidence part inclinedly incident on the optical element to reflect the reflected light, Electrode wire for a solar cell module. 9. The method of claim 8,
Wherein an angle of the total reflection part is not less than 46 degrees and not more than 69 degrees, and an angle of the reflection incidence part is more than 0 degrees and not more than 44 degrees. 9. The method of claim 8,
The inclined portion
A pair of total reflection parts connected to both ends of the first coupling part and a pair of reflection incidence parts connected to the pair of total reflection parts. 9. The method of claim 8,
The inclined portion
A pair of upper total reflection parts connected to both ends of the first coupling part, a pair of upper reflection incidence parts connected to the pair of upper total reflection parts, and a pair of lower reflection parts connected to both ends of the second coupling part, And a pair of lower reflection incidence portions each connected to the pair of lower total reflection portions, wherein the pair of upper reflection incidence portions and the lower reflection incidence portions are symmetrically provided and connected to each other Electrode wire for solar cell module. An optical device that receives light and produces electric power;
A cover part for allowing light to enter the optical device and protecting the optical device; And
An inclined portion which is inclined at a predetermined angle with a line perpendicular to the optical element so as to be incident on the optical element when the incident light is reflected, And an electrode wire having first and second engaging portions respectively provided at upper and lower portions of the inclined portion. 13. The method of claim 12,
Wherein the angle of the inclined portion is determined such that light reflected from the inclined portion is totally reflected by the cover portion and then incident on the optical element again or that light reflected from the inclined portion is incident on the optical element directly Battery module. 14. The method of claim 13,
Wherein the angle of the inclined portion is more than 0 DEG and not more than 44 DEG, or not more than 46 DEG and not more than 69 DEG. 14. The method of claim 13,
Wherein the inclined portion is provided on both sides so as to connect the first engaging portion and the second engaging portion. 16. The method of claim 15,
Wherein a ratio (L1 / L2) of the widths of the first and second coupling portions is 50% to 80%. 16. The method of claim 15,
And a vertical portion connecting the inclined portion and the second coupling portion. 16. The method of claim 15,
The inclined portion
A pair of upper inclined portions connected to both ends of the first engaging portion and a pair of lower inclined portions connected to both ends of the second engaging portion, Are symmetrically connected to each other. 13. The method of claim 12,
The inclined portion
And a reflection incidence part inclined to be incident on the optical element again by the total reflection of the cover part and a reflection incidence part inclinedly incident on the optical element to reflect the reflected light, . 20. The method of claim 19,
Wherein an angle of the total reflection part is not less than 46 degrees and not more than 69 degrees, and an angle of the reflection incidence part is more than 0 degrees and not more than 44 degrees. An electrode wire for a solar cell module provided adjacent to a cover for transmitting power generated by an optical device and protecting the optical device,
A coupling unit coupled to the optical element; And
A total reflection part inclined with a line perpendicular to the optical element to be incident on the optical element by total reflection with the cover part when the incident light is reflected; And an inclined portion having at least one of a reflective portion and a reflective incidence portion inclined with a line perpendicular to the surface of the electrode wire. 22. The method of claim 21,
Wherein an angle of the total reflection part is not less than 46 degrees and not more than 69 degrees, and an angle of the reflection incidence part is more than 0 degrees and not more than 44 degrees. 22. The method of claim 21,
Wherein the coupling portion includes a first coupling portion and a second coupling portion provided at the upper and lower portions of the inclined portion so as to maintain a coupling force with the optical element. 24. The method of claim 23,
And the ratio (L1 / L2) of the widths of the first and second coupling portions is 50% to 80%. 24. The method of claim 23,
The inclined portion
A pair of total reflection parts connected to both ends of the first coupling part and a pair of reflection incidence parts connected to the pair of total reflection parts. 24. The method of claim 23,
The inclined portion
A pair of upper total reflection parts connected to both ends of the first coupling part, a pair of upper reflection incidence parts connected to the pair of upper total reflection parts, and a pair of lower reflection parts connected to both ends of the second coupling part, And a pair of lower reflection incidence portions each connected to the pair of lower total reflection portions, wherein the pair of upper reflection incidence portions and the lower reflection incidence portions are symmetrically provided and connected to each other Electrode wire for solar cell module. An optical device that receives light and produces electric power;
A cover part for allowing light to enter the optical device and protecting the optical device; And
A total reflection portion that is inclined with respect to a line perpendicular to the optical element so as to be incident on the optical element by total reflection with the cover portion when the incident light is reflected, And an electrode wire having an inclined portion having at least one of a line vertical to the optical element and a reflection incidence portion inclined with respect to the optical element so that light is directly incident on the optical element and an engaging portion coupled with the optical element . 27. The method of claim 26,
Wherein an angle of the total reflection part is not less than 46 degrees and not more than 69 degrees, and an angle of the reflection incidence part is more than 0 degrees and not more than 44 degrees. 28. The method of claim 27,
Wherein the coupling portion includes a first coupling portion and a second coupling portion that are respectively provided at upper and lower portions of the inclined portion so as to maintain a coupling force with the optical element. 30. The method of claim 29,
Wherein a ratio (L1 / L2) of the widths of the first and second coupling portions is 50% to 80%. 30. The method of claim 29,
The inclined portion
A pair of total reflection parts connected to both ends of the first coupling part, and a pair of reflection incidence parts connected to the pair of total reflection parts. 30. The method of claim 29,
The inclined portion
A pair of upper total reflection parts connected to both ends of the first coupling part, a pair of upper reflection incidence parts connected to the pair of upper total reflection parts, and a pair of lower reflection parts connected to both ends of the second coupling part, And a pair of lower reflection incidence portions each connected to the pair of lower total reflection portions, wherein the pair of upper reflection incidence portions and the lower reflection incidence portions are symmetrically provided and connected to each other Solar cell module.
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Citations (5)

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Publication number Priority date Publication date Assignee Title
KR20080026568A (en) * 2005-06-01 2008-03-25 루바타 오와이 Electrical connection element
US20090145479A1 (en) * 2007-12-11 2009-06-11 Evergreen Solar, Inc. Shaped Tab Conductors for a Photovoltaic Cell
JP2010272897A (en) * 2010-09-08 2010-12-02 Sanyo Electric Co Ltd Solar cell module
KR20110000695A (en) * 2008-04-11 2011-01-04 퀄컴 엠이엠스 테크놀로지스, 인크. Method for improving pv aesthetics and efficiency
WO2012073771A1 (en) * 2010-11-30 2012-06-07 三洋電機株式会社 Solar cell module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080026568A (en) * 2005-06-01 2008-03-25 루바타 오와이 Electrical connection element
US20090145479A1 (en) * 2007-12-11 2009-06-11 Evergreen Solar, Inc. Shaped Tab Conductors for a Photovoltaic Cell
KR20110000695A (en) * 2008-04-11 2011-01-04 퀄컴 엠이엠스 테크놀로지스, 인크. Method for improving pv aesthetics and efficiency
JP2010272897A (en) * 2010-09-08 2010-12-02 Sanyo Electric Co Ltd Solar cell module
WO2012073771A1 (en) * 2010-11-30 2012-06-07 三洋電機株式会社 Solar cell module

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