TWM502963U - Solar cell module - Google Patents

Abstract

A solar cell module includes a transparent plate, a plurality of solar cells, and a ribbon. The transparent plate has a light-emitting surface. The solar cell is disposed facing the transparent plate. Each of the solar cells includes a substrate, a plurality of bus bars, and an antireflective layer. The bus bars are disposed on the surface of the substrate facing the transparent plate. The number of the bus bars is greater than or equal to 5. The antireflective layer is disposed on the surface of the substrate facing the transparent plate. The ribbon interconnects adjacent two of the solar cells and connects to one of the bus bars. A portion of the ribbon disposed on the bus bar has a side surface near the transparent plate, and the side surface is not parallel to the light-emitting surface of the transparent plate.

Description

Solar battery module

This creation is about a solar cell module.

With the depletion of petroleum energy and the development of environmental protection concepts, the development of alternative new energy sources has become the goal of the industry's current research. The new energy that can be used for development should have the advantages of being rich, not exhausted, safe, clean, not threatening human beings and destroying the environment. For example, renewable energy such as solar energy, wind power, and water power can meet the above conditions. The advantages of energy saving and environmental protection.

Solar cells, also known as photovoltaics, can be used to convert solar energy into energy. Solar cells that are widely used today are capable of generating photocurrents when absorbing light energy, which can be collected and remitted by electrodes in solar cells. However, how to design the structure of the solar cell module to improve the output efficiency of the photocurrent is an important issue in the development of solar energy technology.

One aspect of the present invention provides a solar cell module comprising a transparent plate, a plurality of solar cells, and a solder ribbon. Transparent board has light surface. The solar cell is placed facing the transparent plate. Each solar cell includes a substrate, a plurality of main gate electrodes, and an anti-reflection layer. The main gate electrode is placed on the surface of the substrate facing the transparent plate. The number of main gate electrodes is greater than or equal to five. The antireflection layer is placed on the surface of the substrate facing the transparent plate. The solder ribbon is connected to the adjacent two solar cells and connected to a main gate electrode. A portion of the solder ribbon disposed on the main gate electrode has a side adjacent to the transparent plate that is not parallel to the exit surface of the transparent plate.

In one or more embodiments, the ribbon is cylindrical and lies across the main gate electrode.

In one or more embodiments, the ribbon includes a first portion and a second portion. The first portion is adjacent to the main gate electrode arrangement. The second portion is located between the first portion and the transparent plate. The second portion has sides and is in the shape of a bump. The bumps taper in a direction close to the transparent plate.

In one or more embodiments, the width of the main gate electrode is from about 0.01 mm to about 0.5 mm.

In one or more embodiments, the spacing between the main gate electrodes is from about 2 mm to about 40 mm.

In one or more embodiments, each solar cell further includes a plurality of finger electrodes disposed on a surface of the substrate facing the transparent plate and interlaced with the main gate electrode. The finger electrodes have a width of from about 0.01 mm to about 0.05 mm.

In one or more embodiments, the distance between the finger electrodes is from about 1 mm to about 40 mm.

In one or more embodiments, the number of main gate electrodes is less than or equal to 100.

In one or more embodiments, each solar cell further includes a plurality of electrode strips disposed on a surface of the substrate opposite the transparent plate.

In one or more embodiments, the solar cell module further includes a light transmissive protective layer disposed under the transparent plate and covering the solar cell and the solder ribbon.

The solar cell module of the above embodiment can increase the amount of light collected and the efficiency of collecting carriers, and shorten the path of carriers in the solar cell to the main gate electrode.

100‧‧‧Transparent board

102‧‧‧Glossy surface

200‧‧‧ solar cells

210‧‧‧Substrate

212, 214, 304‧‧‧ surface

260‧‧‧ Passivation layer

262‧‧‧ openings

300‧‧‧ soldering tape

302‧‧‧ side

310‧‧‧Part I

216‧‧‧First semiconductor layer

218‧‧‧Second semiconductor layer

220‧‧‧Main gate electrode

230‧‧‧Anti-reflective layer

240‧‧‧ finger electrode

250‧‧‧electrode strip

320‧‧‧Part II

400‧‧‧Light protective layer

2-2‧‧‧ segments

D1, d2‧‧‧ spacing

L‧‧‧Light

W1, W2, W3‧‧‧ width

Fig. 1 is a top view of a solar cell module according to an embodiment of the invention.

Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1.

Fig. 3 is a cross-sectional view showing a solar battery module of another embodiment.

Fig. 4 is a side view of the solar cell module of Fig. 1.

Fig. 5 is a bottom view of the solar cell of Fig. 1.

Fig. 6 is a side view of a solar cell according to another embodiment of the present invention.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings, and for the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the creation. That is to say, in the implementation part of this creation, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

Fig. 1 is a top view of a solar cell module according to an embodiment of the invention, and Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1. As shown, the solar cell module includes a transparent plate 100, a plurality of solar cells 200, and a solder ribbon 300. The transparent plate 100 has a light exiting surface 102. The solar cell 200 is disposed facing the transparent plate 100. Each solar cell 200 includes a substrate 210, a plurality of main bus bars 220 and an anti-reflection layer 230. The main gate electrode 220 is placed on the surface 212 of the substrate 210 facing the transparent plate 100. The number of main gate electrodes 220 is greater than or equal to five. For example, in Figure 1, the number of main gate electrodes 220 is equal to five. In some embodiments, the number of main gate electrodes 220 is less than or equal to 100. The anti-reflective layer 230 is placed on the surface 212 of the substrate 210 facing the transparent plate 100. The solder ribbon 300 is connected to the adjacent two solar cells 200 and connected to a main gate electrode 220. A portion of the solder ribbon 300 disposed on the main gate electrode 220 has a side 302 adjacent to the transparent plate 100. The side surface 302 is not parallel to the light exit surface 102 of the transparent plate 100.

In the present embodiment, the light-emitting surface 102 of the transparent plate 100 faces the solar cell 200. The light L enters the solar cell module from the transparent plate 100, and then enters the transparent cell 100 from the light exiting surface 102 and enters the solar cell 200. Then, when the light L enters the solar cell 200 from the surface 212 (also referred to as a light incident surface), a photoelectric effect is generated in the substrate 210, so that the light L (light energy) is converted into a photocurrent (electric energy). The rear substrate 210 then generates a carrier that flows from the substrate 210 to the main gate electrode 220 and then is discharged by the main gate electrode 220 to an external load. In addition, although in FIG. 1, the solar cell module includes two solar cells 200, the present invention is not limited thereto. In other embodiments, the solar cell module may include more than two solar cells 200, and the solar energy The batteries 200 can be arranged in a matrix.

The solar cell module of the present embodiment can increase the amount of light collected and the efficiency of collecting carriers, and shorten the path of carriers in the solar cell 200 to the main gate electrode 220. Specifically, in the present embodiment, the side surface 302 and the light-emitting surface 102 of the transparent plate 100 are not parallel. Therefore, even if the light L exits from the light-emitting surface 102 and is incident on the solder ribbon 300 and is reflected by it, the non-parallel structure of the side surface 302 The path reflected by the light L can be deflected so that most of the light L can be deflected into the lower solar cell 200 to increase the amount of light received by the solar cell 200. In addition, since the solar cell 200 of the present embodiment includes more than five main gate electrodes 220, the number of the solar cells 200 is larger than that of the conventional solar cells, so that the efficiency of collecting carriers can be improved. Further, since the number of the main gate electrodes 220 is increased, the pitch d1 between the main gate electrodes 220 is smaller than that of the conventional solar cells, and therefore the distance that the carriers flow to the main gate electrode 220 is also shortened. The shortening of the flow distance means that the electric resistance of the solar cell 200 is also small, so that the efficiency of collecting the carriers is also effectively increased. In addition, the main gate electrode 220 of the present embodiment can be formed, for example, by a screen printing process, so that the manufacturing cost is not increased and the process steps are not increased compared with the conventional solar cell.

In the present embodiment, the solder ribbon 300 is cylindrical, and is lie horizontally and directly soldered to the main gate electrode 220. That is, the cross section of the solder ribbon 300 is circular from the cross-sectional view of FIG. 2, so the side surface 302 It is arcuate, which can reflect the light L leaving the light exiting surface 102 and the direct side surface 302 to different angles to increase the probability of the light L entering the surface 212 of the substrate 210.

However, the structure of the solder ribbon 300 is not limited to the second drawing. Please refer to FIG. 3 , which is a cross section of the solder ribbon 300 and the main gate electrode 220 of another embodiment. Figure. In the present embodiment, the solder ribbon 300 includes a first portion 310 and a second portion 320. The first portion 310 is disposed adjacent to the main gate electrode 220. The second portion 320 is located between the first portion 310 and the transparent plate 100. The second portion 320 has a side surface 302 and is in the shape of a bump. The bumps taper in a direction adjacent to the transparent plate 100, wherein the number of bumps of the second portion 320 can be plural, as shown in FIG. 3, however in other embodiments, the number of bumps can be only one. From a cross-sectional perspective, the second portion 320 can be serrated or wavy, while the side portion 302 is the second portion 320 away from one of the faces of the first portion 310. Additionally, the surface 304 of the first portion 310 facing the main gate electrode 220 may be planar such that there is sufficient contact area between the solder ribbon 300 and the main gate electrode 220 to connect the solder ribbon 300 to the main gate electrode 220.

The first portion 310 and the second portion 320 may be integrally formed or may be a separate structure and bonded by an adhesive layer (not shown). In some embodiments, the material of the solder ribbon 300 may be metal, so the above structure may be formed by a mold forming method, but the solder ribbon 300 may also be made by other methods. In order to prevent the solder ribbon 300 from being deformed during the connection process between the solder ribbon 300 and the main gate electrode 220, the solder ribbon 300 may be connected to the main gate electrode 220 by means of a bonding method (for example, using a conductive paste), or may be subjected to a secondary soldering method. Package.

Please refer to Figure 2 and Figure 3 together. The above-mentioned structures can all achieve the purpose of deflecting the path of reflection of the light L to increase the probability that the light L enters the surface 212 of the substrate 210. The structure of the solder ribbon 300 is not limited to the above. Basically, as long as the side surface 302 of the solder ribbon 300 is not parallel to the light exit surface 102 of the transparent plate 100, the side surface 302 can deflect the path reflected by the light L, which is in the scope of the present creation. in.

Then return to Figure 2. In the present embodiment, the solar cell module further includes a light transmissive protective layer 400 disposed under the transparent plate 100 and covering the solar cell 200 and the solder ribbon 300. The light transmissive protective layer 400 is used to fill the space between the transparent plate 100 and the solar cell 200. In some embodiments, the transparent protective layer 400 can be filled in a space between the transparent plate 100 and the solar cell 200 in a liquid state, and the solder ribbon 300 is deformed in order to prevent the processing temperature of the transparent protective layer 400 from being too high. The processing temperature of layer 400 can be lower than the melting point of ribbon 300.

Then please return to Figure 1. In the present embodiment, the width W1 of the main gate electrode 220 is about 0.01 mm to about 0.5 mm, and the pitch d1 between the main gate electrodes 220 is about 2 mm to about 40 mm, that is, the farthest horizontal flow of the carrier. The distance is from about 1 mm to about 20 mm. With the width W1 and the pitch d1 of the main gate electrode 220 of the present embodiment, the coverage of the main gate electrode 220 on the substrate 210 is less than that of the conventional solar cell. The decrease in coverage mainly indicates that the contact area between the main gate electrode 220 and the substrate 210 becomes smaller, indicating that the light receiving area is increased, so that the number of watts of the module can be increased, and the coverage of the main gate electrode 220 is reduced, and the main gate electrode can be reduced. The amount of 220 helps reduce the cost of the main gate electrode 220 and the overall weight of the solar cell 200. The main gate electrode 220 can be metal and can be formed on the substrate 210 by screen printing or bonding. The present invention is not limited thereto. In addition, the width W2 of the solder ribbon 300 can match the width W1 of the main gate electrode 220, for example, the width W2 is less than or equal to the width W1 to avoid shielding the surface 212 of the substrate 210 (as shown in FIG. 2), that is, the width W2 is approximately From 0.01 mm to about 0.5 mm.

Please refer to Figure 2. In this embodiment, the substrate 210 can be packaged. The first semiconductor layer 216 and the second semiconductor layer 218 are included. The second semiconductor layer 218 is interposed between the main gate electrode 220 and the first semiconductor layer 216. The first semiconductor layer 216 may be a crystalline germanium, such as a single crystal or polycrystalline germanium, and the second semiconductor layer 218 may be a phosphorous doped layer, and thus the solar cell 200 may be a crystalline germanium solar cell. In other embodiments, the solar cell 200 can also be a dye-sensitized battery, and the present invention is not limited thereto. In addition, the transparent plate 100 may be made of glass or plastic.

In the present embodiment, the anti-reflection layer 230 is disposed on the surface 212 (ie, the light incident surface) of the substrate 210. When the material and the thickness thereof are matched, the anti-reflection layer 230 can reflect the light reflected from the substrate 210 back to the substrate. 210, therefore, the amount of light collected by the solar cell 200 can be increased. In some embodiments, the material of the anti-reflective layer 230 is, for example, tantalum nitride. However, the present invention is not limited thereto.

Please refer to Figure 1 and Figure 2 together. In the present embodiment, each solar cell 200 further includes a plurality of finger electrodes 240 disposed on the surface 212 of the substrate 210 and interlaced with the main gate electrode 220. For example, the finger electrodes 240 and the main gate electrode 220 are perpendicular to each other. The width W3 of the finger electrodes 240 is from about 0.01 mm to about 0.05 mm, and the distance d2 between the finger electrodes 240 is from about 1 mm to about 40 mm. Specifically, the finger electrodes 240 may be disposed between the adjacent two main gate electrodes 220 and electrically connected to the at least one main gate electrode 220 to increase the efficiency of collecting the carriers. The carrier generated by the substrate 210 may first reach the finger electrode 240 and then reach the main gate electrode 220 along the finger electrode 240. Since the materials of the finger electrode 240 and the main gate electrode 220 are all conductive materials, such as metal (such as nickel, silver, aluminum, copper or a combination thereof), The electrode 240 can further reduce the resistance value of the path through which the carrier is collected to increase the efficiency of collecting the carrier.

In addition, since the number of the main gate electrodes 220 of the present embodiment is larger than that of the conventional solar cells, the number of the finger electrodes 240 can be smaller than that of the conventional finger electrodes, that is, the collection capable of matching with the conventional solar cells can be achieved. The efficiency of the current can therefore reduce the cost of the finger electrode 240. Further, the finger electrode 240 can be metal, and can be formed on the substrate 210 by screen printing or bonding. The present invention is not limited thereto.

In addition, although the main gate electrode 220 and the finger electrode 240 are both rectangular in FIG. 1, the present invention is not limited thereto. In other embodiments, the main gate electrode 220 and the finger electrode 240 may be elongated, wavy or other suitable shapes, and the main gate electrode 220 and the finger electrode 240 may be the same shape or different shapes. Further, the main gate electrode 220 and the finger electrode 240 may also be non-perpendicular. Basically, as long as the finger electrode 240 is electrically connected to the main gate electrode 220, it is within the scope of the present invention.

Please refer to FIG. 2, FIG. 4 and FIG. 5 together, wherein FIG. 4 is a side view of the solar cell 200 and the solder ribbon 300 of FIG. 1, and FIG. 5 is the bottom of the solar cell module of FIG. view. In the present embodiment, each solar cell 200 further includes a plurality of electrode strips 250 disposed on the surface 214 of the substrate 210 facing away from the transparent plate 100. When a plurality of solar cells 200 constitute a solar cell module, the main gate electrode 220 of one solar cell 200 can be electrically connected to the electrode strip 250 of the other solar cell 200, so that the current of the main gate electrode 220 can be guided to another An electrode strip 250 of the solar cell 200, so the solar cells 200 can be connected in series to enhance the solar cell module Group voltage.

Please refer to Figure 2. In one or more embodiments, the projection of the electrode strip 250 on the substrate 210 overlaps the projection of the main gate electrode 220 on the substrate 210. In other words, the position of the electrode strip 250 corresponds to the position of the main gate electrode 220. However, this creation does not Limited. In addition, please refer to Figure 1 and Figure 5 together. In FIG. 5, each solar cell 200 has 20 electrode strips 250, and each of the four electrode strips 250 is arranged along the extending direction of the main gate electrode 220, and each electrode strip 250 is separated from each other. This structure is called Segmented structure. However, in other embodiments, the number of electrode strips 250 may also be five (that is, have the same number as the main gate electrode 220), and the shape is the same as that of the main gate electrode 220 (ie, elongated), depending on the actual situation. And design.

Next, please refer to FIG. 6, which is a side view of a solar cell 200 according to another embodiment of the present invention. The difference between this embodiment and the embodiment of FIG. 2 lies in the passivation layer 260. In the present embodiment, each solar cell 200 further includes a passivation layer 260 disposed on the surface 214 of the substrate 210. The passivation layer 260 can reduce the probability of the carriers being bonded to the surface 214 to increase the photoelectric flow of the solar cell 200. The passivation layer 260 has a plurality of openings 262. The electrode strips 250 contact the substrate 210 through the openings 262, thereby being electrically connected to the substrate 210. In other words, the electrode strip 250 is exposed by the passivation layer 260. The material of the passivation layer 260 is, for example, aluminum oxide or tantalum nitride. However, the present invention is not limited thereto. The details of the present embodiment are similar to those of FIG. 2, and therefore will not be described again.

In summary, the side surface of the solder ribbon of the above embodiment is not parallel to the light exit surface of the transparent plate, so that the non-parallel structure of the side surface can deflect the path of light reflection, so that most of the light can be deflected to the lower solar cell. In order to increase the amount of light collected by the solar cell. Since solar cells contain more than five main gate electrodes, the number of them is higher than that of conventional solar cells, so the efficiency of collecting carriers can be improved. In addition, since the number of main gate electrodes is increased, the spacing between the main gate electrodes is smaller than that of the conventional solar cells, and the distance from which the carriers flow to the main gate electrodes is also shortened, thereby effectively increasing the efficiency of collecting carriers. In addition, compared with the conventional solar cell, the manufacturing cost of the main gate electrode of the present embodiment does not increase, and the process steps are not increased. On the other hand, in combination with the width and the pitch of the above-mentioned main gate electrode, the coverage of the main gate electrode on the substrate as a whole is less than that of the conventional solar cell, so that the cost of the main gate electrode can be reduced. Further, since the number of main gate electrodes is larger than that of the conventional solar cells, the number of finger electrodes can be smaller than that of the conventional finger electrodes, that is, the efficiency of collecting currents matched with the conventional solar cells can be achieved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present creation. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Transparent board

102‧‧‧Glossy surface

200‧‧‧ solar cells

210‧‧‧Substrate

212, 214‧‧‧ surface

216‧‧‧First semiconductor layer

218‧‧‧Second semiconductor layer

220‧‧‧Main gate electrode

230‧‧‧Anti-reflective layer

250‧‧‧electrode strip

300‧‧‧ soldering tape

302‧‧‧ side

400‧‧‧Light protective layer

L‧‧‧Light

Claims (10)

A solar cell module comprising: a transparent plate having a light-emitting surface; a plurality of solar cells disposed facing the transparent plate, each of the solar cells comprising: a substrate; a plurality of main gate electrodes disposed on the substrate a surface of one of the transparent plates, wherein the number of the main gate electrodes is greater than or equal to five; and an anti-reflection layer disposed on the surface of the substrate facing the transparent plate; and a solder ribbon connecting the adjacent two The solar cells are connected to one of the main gate electrodes, wherein a portion of the solder ribbon disposed on the main gate electrode has a side adjacent to the transparent plate, and the side surface and the light emitting surface of the transparent plate are not parallel. The solar cell module of claim 1, wherein the solder ribbon is cylindrical and lies on the main gate electrodes. The solar cell module of claim 1, wherein the solder ribbon comprises: a first portion disposed adjacent to the main gate electrodes; and a second portion between the first portion and the transparent plate, the second The portion has the side surface and is in the shape of a bump which tapers in a direction close to the transparent plate. The solar cell module of claim 1, wherein the width of the main gate electrodes is from about 0.01 mm to about 0.5 mm. The solar cell module of claim 1, wherein a spacing between the main gate electrodes is from about 1 mm to about 40 mm. The solar cell module of claim 1, wherein each of the solar cells further comprises: a plurality of finger electrodes disposed on the surface of the substrate facing the transparent plate and interlaced with the main gate electrodes Wherein the finger electrodes have a width of from about 0.01 mm to about 0.05 mm. The solar cell module of claim 6, wherein the distance between the finger electrodes is between about 2 mm and about 40 mm. The solar cell module of claim 1, wherein the number of the main gate electrodes is less than or equal to 100. The solar cell module of claim 1, wherein each of the solar cells further comprises: a plurality of electrode strips disposed on a surface of the substrate opposite to the transparent plate, the solder ribbon being further connected to the one Some electrode strips. The solar cell module of claim 1, further comprising: a light transmissive protective layer disposed under the transparent plate and covering the solar cells and the solder ribbon.