TWI517426B - Photovoltaic cell module and manufacturing method thereof - Google Patents

Description

Photovoltaic battery module and manufacturing method thereof

The invention relates to a photovoltaic cell module, and in particular to a thermocompression bonding photovoltaic cell module.

When a conventional photovoltaic cell is modularized, it is required to connect a plurality of photovoltaic cells in series to collect electric energy and increase the voltage. Early photovoltaic cells were printed on the light-receiving surface using silver glue, which has the advantage of rapid process. However, silver glue is costly. Therefore, the conventional technique uses a technique in which a plurality of electrodes are attached to a light receiving surface instead of silver paste printing. Conventional techniques save material costs associated with the use of silver glue. However, it is difficult for a plurality of electrodes to be firmly welded to the light receiving surface at the same time. Therefore, the conventional technique uses a pasting technique to adhere a plurality of electrodes to a light-receiving surface with a polyethylene terephthalate film (PET film). In addition to the complicated procedures in the process, the conventional technique requires a polyethylene terephthalate film to be adhered to the light receiving surface to fix each electrode. The polyethylene terephthalate film absorbs some of the light energy, thus reducing the energy conversion efficiency of the photovoltaic cell. In addition, in the process of using a polyethylene terephthalate film, a plurality of procedures, a plurality of machines are required to perform film bonding, and the like, and the cost in the process is increased.

Therefore, how to design a photovoltaic cell module does not need to be used Polyethylene terephthalate film, while simplifying the process of the process, has become an important issue.

It is therefore an object of the present invention to provide a photovoltaic cell module comprising a first photovoltaic cell, a first electrode and a second photovoltaic cell. The first photovoltaic cell has a light receiving surface for receiving light. The first electrode is disposed on the light receiving surface and electrically connected to the light receiving surface. The first electrode is formed by periodically reciprocatingly bending the linear conductor, and the first electrode is welded to the light receiving surface. The second photovoltaic cell has a backlight side. The backlight surface is electrically connected to the first electrode.

According to an embodiment of the invention, the first electrode includes a straight portion and a bent portion. The straight portions are parallel to the first direction and are arranged in the second direction. The bent portion is connected between two adjacent straight portions.

According to an embodiment of the invention, the first electrode is divided into a first bonding zone, a buffer zone and a second connection zone which are sequentially connected in the first direction. The first weld zone is welded to the light receiving surface. The second connection region is electrically connected to the backlight surface. The buffer zone is located in the gap between the first photovoltaic cell and the second photovoltaic cell.

According to an embodiment of the invention, the photovoltaic cell module further includes a second electrode. The second electrode is disposed on the backlight surface and electrically connected to the backlight surface and the first electrode.

According to an embodiment of the invention, the second electrode comprises a first contact portion and a second contact portion that are connected. The first contact portion and the first electrode are welded to each other. The second contact portion is electrically connected to the backlight surface. The extending direction of the first contact portion is perpendicular to the extending direction of the second contact portion.

According to an embodiment of the invention, the photovoltaic cell module further includes a solder layer soldered between the first electrode and the light receiving surface. The solder layer is composed of a low melting conductive material.

According to an embodiment of the invention, the material of the solder layer comprises a tin indium alloy.

The invention further provides a method for manufacturing a photovoltaic cell module, comprising: (a) providing a first photovoltaic cell, wherein the first photovoltaic cell has a light receiving surface; (b) providing a linear conductor; (c) periodically reciprocating bending line shape Forming a first electrode; (d) soldering the first electrode to the light receiving surface; (e) providing a second photovoltaic cell, wherein the second photovoltaic cell has a backlight surface; and (f) electrically connecting the first electrode to the backlight surface.

According to an embodiment of the present invention, the step of periodically reciprocatingly bending the linear conductor to form the first electrode is to cause the first electrode to include a straight portion and a bent portion, the straight portion being parallel to the first direction and along the second direction Arranged, the bent portion is connected between two adjacent straight portions.

According to an embodiment of the invention, the first electrode is divided into a first bonding zone, a buffer zone and a second connection zone which are sequentially connected in the first direction. The step of soldering the first electrode to the light receiving surface is to solder the first bonding region to the light receiving surface. The step of electrically connecting the first electrode to the backlight surface electrically connects the second connection region to the backlight surface.

According to an embodiment of the invention, the step of electrically connecting the first electrode to the backlight surface further comprises: (g) soldering the second electrode to the first electrode, wherein the second electrode is located at a position other than the first photovoltaic cell; and (h) The second electrode is electrically connected to the backlight surface.

According to an embodiment of the present invention, the step of soldering the first electrode on the light receiving surface is to solder the first electrode to the light receiving surface by using a solder layer. The solder layer is composed of a low melting conductive material.

In summary, the first electrode of the photovoltaic cell module of the present invention is formed by periodically reciprocatingly bending a linear conductor. The process of soldering the first electrode to the light receiving surface is relatively simple. Moreover, since the present invention uses a single linear conductor, the soldering is relatively stable. The invention not only saves the cost caused by using the polyethylene terephthalate film, but also improves the energy conversion efficiency of the photovoltaic cell. In an embodiment, the second electrode is electrically connected to the backlight surface. Since the backlight surface has no problem of sunshine rate, the second electrode having a large contact area is electrically connected to the backlight surface, which does not shield sunlight, and can effectively reduce the ohmic heat resistance, thereby improving energy conversion efficiency. The use of low-melting conductive materials as a soldering layer for photovoltaic cell modules enables soldering time to be reduced to less than 3 seconds, resulting in significant process time savings and increased throughput. In the photovoltaic cell module manufacturing method, since the polyethylene terephthalate film is not required to be used, the manufacturing steps are simplified. At the same time, since the manufacturing method of the present invention does not require the use of a film laminating machine, it is only necessary to use a thermocompression bonding machine to complete the modularization of the photovoltaic cell, thereby saving the cost of the machine purchase.

100‧‧‧Photovoltaic battery module

100a‧‧‧Photovoltaic battery module

120‧‧‧First photovoltaic cell

122‧‧‧Glossy surface

130‧‧‧First electrode

132‧‧‧ Straight line

134‧‧‧Bending

140‧‧‧Second photovoltaic cell

142‧‧‧ Backlight

150‧‧‧First Weld Zone

152‧‧‧ buffer zone

154‧‧‧Second connection area

160‧‧‧second electrode

162‧‧‧First contact

164‧‧‧Second contact

170‧‧‧welding layer

A1‧‧‧ first direction

A2‧‧‧ second direction

S101~S106, S106a, S106b‧‧‧ steps

FIG. 1 is a top view of a photovoltaic cell module in accordance with an embodiment of the present invention.

2 is a side view of the photovoltaic cell module of FIG. 1.

FIG. 3 is a schematic exploded view of the photovoltaic cell module of FIG. 1.

4 is a top view of a photovoltaic cell module in accordance with another embodiment of the present invention.

Figure 5 is a side view of the photovoltaic cell module of Figure 4.

FIG. 6 is a schematic exploded view of the photovoltaic cell module of FIG. 4.

FIG. 7 is a flow chart showing a method of manufacturing a photovoltaic cell module according to an embodiment of the present invention.

FIG. 8 is a flow chart showing a method of fabricating a photovoltaic cell module according to another embodiment of the present invention.

In order to make the description of the present disclosure more detailed and complete, reference is made to the accompanying drawings and the embodiments of the invention. However, the embodiments provided are not intended to limit the scope of the present invention, and the description of the operation of the structure is not intended to limit the order in which it is performed. Any device that is recombined by the components produces equal devices. The scope covered by the invention.

The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.

First embodiment of a photovoltaic cell module

Please refer to Figures 1 to 3 first. Figure 1 is a diagram showing the invention in accordance with the present invention. A top view of a photovoltaic cell module 100 of an embodiment. 2 is a side view of the photovoltaic cell module 100 of FIG. 1. FIG. 3 is a schematic exploded view of the photovoltaic cell module 100 of FIG. 1 .

As shown in FIG. 1 to FIG. 3 , in the present embodiment, the photovoltaic cell module 100 includes a first photovoltaic cell 120 , a first electrode 130 , and a second photovoltaic cell 140 . The first photovoltaic cell 120 has a light receiving surface 122 for receiving light. The first electrode 130 is formed by periodically reciprocatingly bending the linear conductor, and the first electrode 130 is soldered to the light receiving surface 122 to electrically connect the light receiving surface 122. The second photovoltaic cell 140 has a backlight surface 142. The backlight surface 142 is electrically connected to the first electrode 130. In the embodiment, the first electrode 130 is divided into a first bonding region 150, a buffer region 152 and a second connection region 154 which are sequentially connected in the first direction A1. The first land 150 is welded to the light receiving surface 122. The second connection region 154 is electrically connected to the backlight surface 142. In the present embodiment, the backlight surface 142 is placed on the second connection region 154, and thus is connected to each other and fixed at the time of packaging, but the invention is not limited thereto. Buffer 152 is located between the first photovoltaic cell 120 and the second photovoltaic cell 140. The first electrode 130 that has been periodically reciprocally bent includes the linear portion 132 and the bent portion 134. The straight portions 132 are parallel to the first direction A1 and are arranged in the second direction A2. The bent portion 134 is connected between the two adjacent straight portions 132.

The first electrode 130 of the photovoltaic cell module 100 of the present invention is formed by periodically reciprocatingly bending a linear conductor. Therefore, the process of soldering the first electrode 130 to the light receiving surface 122 is relatively simple. Moreover, since the present invention uses a single linear conductor, the soldering is relatively stable. The invention not only saves the use of the poly pair The cost caused by the ethylene phthalate film also increases the energy conversion efficiency of the photovoltaic cell. In one embodiment, the first photovoltaic cell 120 is a 6-inch photovoltaic cell. The first electrode 130 has 38 straight portions 132. The line portion 132 has a line width of 150 μm and may be extended to 170 μm after thermocompression bonding to the light receiving surface 122. This embodiment is one of the embodiments of the optimum value of energy conversion efficiency. This embodiment is one of the values obtained for the balance between the shadow rate and the ohmic resistance efficiency, and is not intended to limit the present invention.

It should be noted that the number of the straight portions 132 and the line widths listed above are merely examples, and are not intended to limit the present invention. Those having ordinary knowledge in the technical field to which the present invention pertains should select an appropriate number and line width depending on actual needs.

In particular, in the present embodiment, the photovoltaic cell module 100a further includes a solder layer 170 soldered between the first electrode 130 and the light receiving surface 122. The solder layer 170 is composed of a low melting conductive material. The material of the solder layer 170 contains a tin indium alloy. The use of a low melting conductive material as the solder layer 170 allows the soldering time to be shortened to within 3 seconds. Significantly saves process time and increases productivity.

It should be noted that the materials of the solder layer 170 listed above are merely exemplified, and are not intended to limit the present invention. Those having ordinary knowledge in the technical field of the present invention should select an appropriate material according to actual needs.

Second embodiment of photovoltaic cell module

Please refer to Figures 4 to 6. 4 is a top view of a photovoltaic cell module 100a in accordance with another embodiment of the present invention. FIG. 5 is a side view of the photovoltaic cell module 100a of FIG. 4. Figure 6 shows Figure 4 An exploded schematic view of the photovoltaic cell module 100a.

As shown in FIGS. 4 to 6 , in the present embodiment, the photovoltaic cell module 100 a further includes a second electrode 160 . The second electrode 160 is disposed on the backlight surface 142 and electrically connected to the backlight surface 142 and the first electrode 130. The difference between the present embodiment and the first embodiment is that the first embodiment is directly electrically connected to the backlight surface 142 by the first electrode 130. However, in the present embodiment, the second electrode 160 is soldered to the first electrode 130, and the second electrode 160 is electrically connected to the backlight surface 142. The first electrode 130 is electrically connected to the backlight surface 142 through the second electrode 160.

In the embodiment, the second electrode 160 is electrically connected to the backlight surface 142. Since the backlight surface 142 has no problem of the sunshine rate, the second electrode 160 having a large contact area is electrically connected to the backlight surface 142, which can effectively reduce the ohmic thermal resistance and further improve the energy conversion efficiency. In the present embodiment, the backlight surface 142 is placed on the second electrode 160, and thus is connected to each other and fixed at the time of packaging, but the present invention is not limited thereto.

As shown in FIGS. 5 and 6 , in the present embodiment, the second electrode 160 includes the first contact portion 162 and the second contact portion 164 that are connected. The first contact portion 162 and the first electrode 130 are welded to each other. The second contact portion 164 is electrically connected to the backlight surface 142 . The extending direction of the first contact portion 162 is perpendicular to the extending direction of the second contact portion 164.

In particular, in the present embodiment, the photovoltaic cell module 100a further includes a solder layer 170 soldered between the first electrode 130 and the light receiving surface 122. The solder layer 170 is composed of a low melting conductive material. The material of the solder layer 170 contains a tin indium alloy. The present invention uses a low melting conductive material as the solder layer 170 The welding time can be shortened to less than 3 seconds. Significantly saves process time and increases productivity.

It should be noted that the materials of the solder layer 170 listed above are merely exemplified, and are not intended to limit the present invention. Those having ordinary knowledge in the technical field of the present invention should select an appropriate material according to actual needs.

First embodiment of a photovoltaic cell module manufacturing method

FIG. 7 is a flow chart showing a method of manufacturing a photovoltaic cell module according to an embodiment of the present invention.

As shown in FIG. 7, in the present embodiment, the photovoltaic cell module manufacturing method includes the visual inspection method including steps S100 to S106, as shown below.

Step S101: providing a first photovoltaic cell, wherein the first photovoltaic cell has a light receiving surface.

Step S102: providing a linear conductor.

Step S103: periodically forming a first electrode by bending the linear conductor reciprocally.

Step S104: soldering the first electrode to the light receiving surface.

Step S105: providing a second photovoltaic cell, wherein the second photovoltaic cell has a backlight surface.

Step S106: electrically connecting the first electrode to the backlight surface.

In the present embodiment, the step of periodically reciprocatingly bending the linear conductor to form the first electrode is to cause the first electrode to include a straight portion and a bent portion, the straight portion being parallel to the first direction and arranged in the second direction The bent portion is connected between two adjacent straight portions. The first electrode is drawn in the first direction It is divided into a first welding zone, a buffer zone and a second connection zone which are sequentially connected. The step of soldering the first electrode to the light receiving surface is to solder the first bonding region to the light receiving surface. The step of electrically connecting the first electrode to the backlight surface electrically connects the second connection region to the backlight surface.

Further, in the present embodiment, the step of soldering the first electrode on the light receiving surface is to weld the first electrode to the light receiving surface by a solder layer. The solder layer is composed of a low melting conductive material.

In particular, in the method for fabricating a photovoltaic cell module of the present invention, since the polyethylene terephthalate film is not required to be used, the manufacturing steps are simplified. At the same time, since the manufacturing method of the present invention simplifies the equipment of the film laminating machine, it is only necessary to use the hot press welding machine to complete the modularization of the photovoltaic cell, thereby saving the cost of the machine purchase.

Second embodiment of a photovoltaic cell module manufacturing method

FIG. 8 is a flow chart showing a method of fabricating a photovoltaic cell module according to another embodiment of the present invention.

As shown in FIG. 8, in the present embodiment, the photovoltaic cell module manufacturing method includes the visual inspection method including steps S100 to S105, S106a, and S106b, as shown below.

Step S101: providing a first photovoltaic cell, wherein the first photovoltaic cell has a light receiving surface.

Step S102: providing a linear conductor.

Step S103: periodically forming a first electrode by bending the linear conductor reciprocally.

Step S104: soldering the first electrode to the light receiving surface.

Step S105: providing a second photovoltaic cell, wherein the second photovoltaic cell has a backlight surface.

Step S106a: soldering the second electrode to the first electrode, wherein the second electrode is located at a position other than the first photovoltaic cell.

Step S106b: electrically connecting the second electrode to the backlight surface.

The difference between this embodiment and the first embodiment is that step S106 of the first embodiment is directly electrically connected to the backlight surface with the first electrode. In contrast, in the present embodiment, the second electrode is soldered to the first electrode, and the second electrode is electrically connected to the backlight surface, and the first electrode is electrically connected to the surface to be lighted through the second electrode. In other words, in the present embodiment, step S106 of the first embodiment is disassembled into S106a and S106b. This is for the introduction of the second electrode. Since the backlight surface has no problem of sunshine rate, the second electrode having a large contact area is electrically connected to the backlight surface, which does not shield sunlight, and can effectively reduce the ohmic heat resistance, thereby improving energy conversion efficiency.

In summary, the first electrode of the photovoltaic cell module of the present invention is formed by periodically reciprocatingly bending a linear conductor. The process of soldering the first electrode to the light receiving surface is relatively simple. Moreover, since the present invention uses a single linear conductor, the soldering is relatively stable. The invention not only saves the cost caused by using the polyethylene terephthalate film, but also improves the energy conversion efficiency of the photovoltaic cell. In an embodiment, the second electrode is electrically connected to the backlight surface. Since the backlight surface has no problem of sunshine rate, the second electrode having a large contact area is electrically connected to the backlight surface, which does not shield sunlight, and can effectively reduce the ohmic heat resistance, thereby improving energy conversion efficiency. Photovoltaic cell module The group uses a low-melting conductive material as a soldering layer to shorten the soldering time to less than 3 seconds, which greatly saves process time and increases productivity. In the photovoltaic cell module manufacturing method, since the polyethylene terephthalate film is not required to be used, the manufacturing steps are simplified. At the same time, since the manufacturing method of the present invention does not require the use of a film laminating machine, it is only necessary to use a thermocompression bonding machine to complete the modularization of the photovoltaic cell, thereby saving the cost of the machine purchase.

100‧‧‧Photovoltaic battery module

120‧‧‧First photovoltaic cell

122‧‧‧Glossy surface

130‧‧‧First electrode

140‧‧‧Second photovoltaic cell

A1‧‧‧ first direction

A2‧‧‧ second direction

Claims (12)

A photovoltaic cell module comprising: a first photovoltaic cell having a light receiving surface for receiving a light; a first electrode disposed on the light receiving surface and electrically connected to the light receiving surface, the first The electrode system is formed by a linear conductor periodically reciprocatingly bent in an S shape and forming a plurality of U-shapes on opposite sides, and the first electrode forms one side of the U-shape and is soldered to the light-receiving surface; The second photovoltaic cell has a backlight surface, and the backlight surface is electrically connected to the other side of the first electrode forming the U-shape. The photovoltaic cell module of claim 1, wherein the first electrode comprises a plurality of straight portions and a plurality of bent portions, the straight portions are parallel to a first direction and are arranged along a second direction, each The bent portions are connected between the two adjacent straight portions. The photovoltaic cell module of claim 2, wherein the first electrode is divided into a first bonding region, a buffer region and a second connection region in the first direction, the first bonding region Soldering on the light receiving surface, the second connection region is electrically connected to the backlight surface, and the buffer is located in a gap between the first photovoltaic cell and the second photovoltaic cell. The photovoltaic cell module of claim 2, further comprising a second electrode disposed on the backlight surface and electrically connected to the backlight surface The first electrode. The photovoltaic cell module of claim 4, wherein the second electrode comprises a first contact portion and at least a second contact portion, the first contact portion being soldered to the first electrode, the second contact portion Electrically connected to the backlight surface, the first contact portion extends in a direction perpendicular to the extending direction of the second contact portion. The photovoltaic cell module of claim 1, further comprising a solder layer soldered between the first electrode and the light receiving surface, the solder layer being composed of a low melting conductive material. The photovoltaic cell module of claim 6, wherein the material of the solder layer comprises a tin indium alloy. A method for manufacturing a photovoltaic cell module, comprising: providing a first photovoltaic cell, wherein the first photovoltaic cell has a light receiving surface; providing a linear conductor; periodically reciprocating the linear conductor according to the S shape and forming the opposite two Forming a first electrode on a side of the plurality of U-shapes; soldering the first electrode to form one of the U-shaped sides on the light-receiving surface; providing a second photovoltaic cell, wherein the second photovoltaic cell has a backlight surface; Electrically connecting the first electrode to form the other side of the U-shape on the backlight surface. The method for manufacturing a photovoltaic cell module according to claim 8, wherein the step of periodically reciprocating and bending the linear conductor to form the first electrode is such that the first electrode includes a plurality of straight portions and a plurality of bent portions, The straight portions are parallel to a first direction and are arranged along a second direction, and each of the bent portions is connected between the two adjacent straight portions. The method for manufacturing a photovoltaic cell module according to claim 9, wherein the first electrode is divided into a first bonding region, a buffer region and a second connection region in the first direction, and the first electrode is soldered. An step of the electrode on the light receiving surface is to solder the first bonding region to the light receiving surface, and electrically connecting the first electrode to the backlight surface to electrically connect the second connection region to the backlight surface. The method of manufacturing the photovoltaic cell module of claim 8, wherein the step of electrically connecting the first electrode to the backlight surface further comprises: soldering a second electrode to the first electrode, wherein the second electrode is located at the first a location other than the photovoltaic cell; and electrically connecting the second electrode to the backlight surface. The method for manufacturing a photovoltaic cell module according to claim 8, wherein the step of soldering the first electrode to the light receiving surface is performed by using a solder layer The first electrode is on the light receiving surface, and the solder layer is composed of a low melting conductive material.