TW201717417A - Photovoltaic conversion unit, photovoltaic conversion module using the same, and method for manufacturing the same - Google Patents

Abstract

A photovoltaic conversion unit includes a solar cell, first electrode lines, and second electrode lines. The first electrode lines are extended along a first direction and are arranged on the solar cell along a second direction, in which the first direction and the second direction are orthogonal. The second electrode lines are extended along the second direction and are arranged on the solar cell and the first electrode lines along the first direction, in which at least two of the second electrode lines are adjacent and are contacted to each other in the first direction.

Description

Photovoltaic conversion unit, photovoltaic module using the same How to make it

The invention relates to a photovoltaic conversion unit, a photovoltaic battery module using the same and a manufacturing method thereof.

In recent years, as the stock of crude oil around the world has decreased year by year, the energy issue has become the focus of global attention. In order to solve the crisis of energy exhaustion, the development and utilization of various alternative energy sources is a top priority. With the rising awareness of environmental protection, coupled with the zero pollution of solar energy and the inexhaustible advantages of solar energy, solar energy has become the focus of attention in related fields. Therefore, in places where there is sufficient sunshine, such as building roofs, squares, etc., it is becoming more and more common to install solar panels.

The solar module is mainly composed of a plurality of solar cells, and therefore, the power generation efficiency of the solar module is related to the component characteristics of the individual solar cells. In addition, the power generation efficiency of solar modules is also related to the assembly of multiple solar cells. In this regard, how to improve the power generation efficiency of solar modules The rate has become an important topic in related fields.

In view of this, an embodiment of the present invention provides a photovoltaic conversion unit that includes second electrode lines adjacent to each other in a first direction to increase conductivity and reduce photocurrent generated by the solar cell. Loss of the conduction process. Further, the second electrode lines may be respectively disposed in the second electrode line group. And in each of the second electrode line groups, since each of the first electrode lines can have at least one contact with the adjacent and in contact two second electrode lines, the reliability and service life of the photovoltaic conversion unit Can also be improved.

An embodiment of the present invention provides a photovoltaic conversion unit including a solar cell sheet, a first electrode line, and a second electrode line. The first electrode line extends in the first direction and is disposed on the solar cell sheet in the second direction, wherein the first direction is orthogonal to the second direction. The second electrode line extends in the second direction and is disposed on the solar cell sheet and the first electrode line in the first direction, wherein the at least two second electrode lines are adjacent to and in contact with each other in the first direction.

In some embodiments, the second electrode lines adjacent to each other and in contact in the first direction are at least line contacts.

In some embodiments, the photovoltaic conversion unit further includes a second electrode line group. The second electrode line group is disposed on the solar cell sheet and the first electrode line along the first direction, wherein the second electrode line is disposed in the second electrode line group, and each of the second electrode line groups is disposed At least two second electrode lines.

In some embodiments, two second electrode lines are disposed in each of the second electrode line groups.

In some embodiments, the second electrode line group is periodically arranged along the first direction.

In some embodiments, an equal number of second electrode lines are disposed in each of the second electrode line groups.

In some embodiments, each of the second electrode lines has a circular or elliptical cross section in the second direction.

One embodiment of the present invention provides a photovoltaic cell module including a photovoltaic conversion unit, wherein the second electrode line is used to electrically connect adjacent solar cells.

In some embodiments, the photovoltaic conversion unit constitutes a series circuit.

One embodiment of the present invention provides a method of fabricating a photovoltaic conversion unit, comprising the following steps. A first electrode line is disposed on the solar cell sheet. A second electrode line adjacent to and in contact with each other is disposed on the first electrode line of the solar cell sheet, wherein the extending directions of the first electrode line and the second electrode line are orthogonal to each other.

In some embodiments, the adjacent second electrode lines are formed by a through coating process or an evaporation process.

In some embodiments, the step of disposing the second electrode lines adjacent to and contacting each other on the solar cell sheet and the first electrode line comprises the following steps. After the second electrode lines are respectively formed, the second electrode lines are disposed on the solar cell sheets and the first electrode lines.

100‧‧‧Photovoltaic conversion unit

102‧‧‧Solar cell

104, 104'‧‧‧First electrode line

106, 106a, 106b‧‧‧ second electrode line

108‧‧‧Second electrode line group

110‧‧‧Photovoltaic battery module

D1‧‧‧ first direction

D2‧‧‧ second direction

I-I’‧‧‧ segment

FIG. 1A is a schematic top view of a photovoltaic conversion unit according to a first embodiment of the present invention.

Fig. 1B is a side cross-sectional view showing the photovoltaic conversion unit of Fig. 1A along the line segment I-I'.

2 is a schematic top view of a photovoltaic conversion unit according to a second embodiment of the present invention.

3A and 3B are respectively a top view and a side view of a photovoltaic cell module to which the photovoltaic conversion unit of FIG. 2 is applied.

The embodiments of the present invention are disclosed in the following drawings, and the details of However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, 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.

One embodiment of the present invention provides a photovoltaic conversion unit that includes second electrode lines adjacent to each other in a first direction to increase conductivity and reduce loss of photocurrent during conduction. In addition, the second electrode lines may be respectively disposed in the second electrode line group, and in each of the second electrode line groups, since each of the first electrode lines may be adjacent to and in contact with the two The two electrode wires have at least one contact, so the reliability and service life of the photovoltaic conversion unit can also be improved.

Please refer to Figure 1A and Figure 1B. FIG. 1A is a top view of the photovoltaic conversion unit 100 of the first embodiment of the present invention. FIG. 1B is a side cross-sectional view of the photovoltaic conversion unit 100 of FIG. 1A along the line segment I-I'. The photovoltaic conversion unit 100 includes a solar cell sheet 102, a first electrode line 104, and a second electrode line 106.

The first electrode line 104 extends along the first direction D1 and is disposed on the solar cell sheet 102 along the second direction D2, wherein the first direction D1 is orthogonal to the second direction D2. The first electrode line 104 may be a screen printed electrode line. The second electrode line 106 extends along the second direction D2 and is disposed on the solar cell panel 102 and the first electrode line 104 along the first direction D1, wherein at least two of the second electrode lines 106 of the second electrode line 106 are in the first One direction D1 is adjacent to and in contact with each other, for example, the second electrode lines 106a and 106b. The second electrode line 106 may be a metal wire.

In the present embodiment, the first electrode line 104 is used to take out the photocurrent generated by the solar cell sheet 102. Then, the photocurrent taken out from the solar cell sheet 102 is further transmitted to the external element through the second electrode line 106. For example, the photovoltaic conversion unit 100 can be connected to an electronic device, wherein the photocurrent generated by the solar cell 102 of the photovoltaic conversion unit 100 can be transmitted to the electronic device through the second electrode line 106. Alternatively, the plurality of photovoltaic conversion units 100 may be connected in series through the second electrode line 106 to form a module system.

Since at least two of the second electrode lines 106a and 106b of the second electrode line 106 are adjacent to and in contact with each other in the first direction D1, the conductivity of the photovoltaic conversion unit 100 can pass through the second electrode adjacent to and in contact with each other. Lines 106a and 106b are boosted such that the photocurrent generated by solar cell 102 can be derived more efficiently. In other words, the photocurrent generated by the solar cell The loss in the conduction process will be reduced.

Further, the reliability of the photovoltaic conversion unit 100 can also be improved by the second electrode lines 106a and 106b adjacent to and in contact with each other in the first direction D1. For example, the photovoltaic conversion unit 100 can include a second electrode line group 108 in which the second electrode lines 106a and 106b are located in the second electrode line group 108. In other words, the second electrode lines 106a and 106b can be regarded as one second electrode line group 108, wherein the second electrode lines 106a and 106b in each of the first electrode line 104 and the second electrode line group 108 have at least one time or more. s contact.

In this configuration, an unpredictable condition occurs in one of the second electrode lines 106a or 106b of the second electrode lines 106a and 106b in the second electrode line group 108 when affected by the process environment or the use environment (eg, When the line is oxidized or partially broken, the first electrode line 104 can still maintain electrical communication with the other second electrode line 106a or 106b of the second electrode line group 108. For example, when the second electrode line 106a and the first electrode line 104' are disconnected, the first electrode line 104' can still take out the photocurrent generated by the solar cell panel 102 through the second electrode line 106b.

In other words, when another photovoltaic conversion unit is in contact with the first electrode line by a single second electrode line, when one of the first electrode lines and one of the second electrode lines are disconnected, the light generated by the solar cell sheet The current will be disconnected due to the disconnection, and the photocurrent cannot be taken out as designed, resulting in a higher photoelectric transmission loss of the photovoltaic conversion unit. Therefore, by the second electrode lines adjacent to each other and in contact with each other, it is possible to avoid occurrence of the above-mentioned situation in which the photocurrent transmission efficiency is lowered due to the disconnection.

Further, by this configuration, due to each first electric The second line 106a and 106b of the second line group 108 and the second electrode line group 108 may have at least one contact, and the yield of the photovoltaic conversion unit 100 may be further improved due to an increase in process reliability. On the other hand, when one of the second electrode lines 106a or 106b of the second electrode lines 106a and 106b in the second electrode line group 108 is used for a long period of time, causing an unexpected situation to occur, the first electrode line 104 can still be The electrical communication with the other of the second electrode lines 106a or 106b in the second electrode line group 108 is maintained, so that the service life of the photovoltaic conversion unit 100 can also be extended.

As shown in FIG. 1B, the second electrode lines 106a and 106b have a circular or elliptical cross section in the second direction D2. Therefore, in the present embodiment, the second electrode lines 106a and 106b adjacent to each other and in contact with each other in the first direction D1 are at least in line contact. However, it should be understood that the cross-sectional shapes of the second electrode lines 106a and 106b in the second direction D2 are merely illustrative, and are not intended to limit the present invention, and those of ordinary skill in the art to which the present invention pertains, The cross-sectional shape of the second electrode lines 106a and 106b in the second direction D2 can be elastically selected. For example, the cross-sectional shape of the second electrode lines 106a and 106b in the second direction D2 may be designed such that the contact between the second electrode lines 106a and 106b is in the shape of a surface contact.

In addition, in the embodiment, the manufacturing method of the photovoltaic conversion unit 100 can be realized through the following steps. First, the first electrode line 104 is disposed on the solar cell sheet 102. Next, second electrode lines 106 adjacent to and in contact with each other, such as second electrode lines 106a and 106b, wherein the extension of the first electrode lines 104 and the second electrode lines 106 are disposed on the solar cell sheet 102 and the first electrode line 104 The directions are orthogonal to each other. Wherein the adjacent second electrode lines 106 can pass through the coating process Or the evaporation process is formed, please see the instructions below.

For example, in the embodiment in which the second electrode line 106 is formed by a coating process, the second electrode lines 106 adjacent to each other and in contact may be separately formed, for example, the second electrode lines 106a and 106b are formed separately. Next, the second electrode line 106 is disposed on the solar cell sheet 102 and the first electrode line 104. Further, in the manufacturing process of the second electrode line 106, the second electrode line 106 may be formed by plating a metal wire with a conductive layer, and then the metal wire plated with the conductive layer is disposed on the solar cell sheet. 102 is on the first electrode line 104. Further, the plated conductive layer may be in a molten state such that adjacent and contact second electrode lines 106 may be connected to each other after the conductive layer is cured.

In summary, the photovoltaic conversion unit of the present invention increases the conductivity of the second electrode line adjacent to and in contact with each other in the first direction, so that the photocurrent generated by the solar cell can be more efficiently derived, and In order to reduce the loss of photocurrent in the conduction process. In addition, the reliability and the service life of the photovoltaic conversion unit 100 can also be improved by the configuration that the second electrode line of each of the first electrode lines and the second electrode line group has at least one contact.

FIG. 2 is a schematic top view of the photovoltaic conversion unit 100 according to the second embodiment of the present invention. The difference between the present embodiment and the first embodiment is that at least two second electrode lines are disposed in each of the second electrode line groups 108 among the second electrode line groups 108 included in the photovoltaic conversion unit 100. 106.

In this embodiment, the number of the second electrode line groups 108 is plural, and the second electrode line group 108 is disposed on the solar cell sheet 102 and the first electrode line 104 along the first direction D1, wherein the second electrode line Groups 108 are periodically arranged along the first direction D1. That is, between adjacent second electrode line groups 108 One pitch S, and the spacing S between each group of adjacent second electrode line groups 108 is the same. Further, in the present embodiment, two second electrode lines 106 are disposed in each of the second electrode line groups 108. In other words, an equal number of second electrode lines 106 are disposed in each of the second electrode line groups 108. However, it should be understood that the number of second electrode lines 106 disposed in each of the second electrode line groups 108 is merely illustrative, and is not intended to limit the present invention, and is generally in the technical field of the present invention. The knowledgeer can flexibly select the number of second electrode lines 106 disposed in each of the second electrode line groups 108.

With this configuration, the overall conductivity of the photovoltaic conversion unit 100 can be improved, so that the photocurrent generated by the solar cell 102 can be derived more efficiently. Furthermore, since the photocurrent generated by the solar cell 102 can be derived more efficiently, the number of second electrode lines 106 in the photovoltaic conversion unit 100 can vary depending on the design. For example, since the adjacent and in contact second electrode lines 106 can be used to more efficiently derive the photocurrent generated by the solar cell 102, the number of second electrode lines 106 on the solar cell 102 is Can be correspondingly reduced. In other words, through the second electrode line 106 adjacent to and in contact with each other, the photovoltaic conversion unit 100 can reduce the number of the second electrode lines 106 while maintaining the same element characteristics to reduce the manufacturing cost.

Please refer to Figures 3A and 3B. 3A and 3B are respectively a top view and a side view of the photovoltaic cell module 110 to which the photovoltaic conversion unit 100 of FIG. 2 is applied. The photovoltaic cell module 110 includes a photovoltaic conversion unit 100, wherein the photovoltaic cell module 110 depicted in FIGS. 3A and 3B is the photovoltaic conversion unit 100 to which the second embodiment is applied. However, the photovoltaic cell module 110 can also be applied to the photovoltaic conversion unit 100 of the first embodiment, and details are not described herein again.

In this embodiment, the second electrode line 106 is used to electrically connect adjacent solar cells 102 such that the plurality of photovoltaic conversion units 100 can form a series circuit. As described above, since the adjacent and in contact second electrode lines 106 can cause the photocurrent generated by the solar cell 102 to be more efficiently derived, and thereby reduce the loss of the photocurrent during the conduction process, thereby The performance of the photovoltaic cell module 110 formed by the photovoltaic conversion unit 100 can also be improved by this. In addition, since the second electrode line 106 electrically connecting the adjacent solar cell sheets 102 is still disposed in such a manner that each two second electrode lines 106 are adjacent to each other and in contact with each other, the same as the foregoing, the photovoltaic cell module 110 Reliability and service life can also be improved.

In summary, the photovoltaic conversion unit of the present invention enhances the conductivity through the second electrode lines adjacent to and in contact with each other in the first direction, so that the photocurrent generated by the solar cell can be more efficiently extracted and thereby reduce the light. Current loss in the conduction process. In addition, among each of the second electrode line groups, since each of the first electrode lines can have at least one contact with the adjacent and contact second electrode lines, the reliability and service life of the photovoltaic conversion unit can also be Being promoted.

Furthermore, a plurality of photovoltaic conversion units can form a photovoltaic cell module. In the photovoltaic cell module, the photovoltaic cell module can more efficiently derive the overall photocurrent through the second electrode lines adjacent to each other and in contact with each other. On the other hand, in the photovoltaic cell module, the photovoltaic conversion unit can reduce the number of second electrode lines while maintaining the same component characteristics, thereby reducing manufacturing costs.

The present invention has been disclosed in various embodiments as described above, but it is not intended to limit the invention, and those skilled in the art may, without departing from the spirit of the invention. The scope of protection of the present invention is defined by the scope of the appended claims.

100‧‧‧Photovoltaic conversion unit

102‧‧‧Solar cell

104, 104'‧‧‧First electrode line

106, 106a, 106b‧‧‧ second electrode line

108‧‧‧Second electrode line group

D1‧‧‧ first direction

D2‧‧‧ second direction

I-I’‧‧‧ segment

Claims (12)

A photovoltaic conversion unit comprising: a solar cell sheet; a plurality of first electrode lines extending along a first direction and disposed on the solar cell sheet in a second direction, wherein the first direction Orthogonal to the second direction; and a plurality of second electrode lines extending along the second direction and disposed along the first direction on the solar cell and the first electrode lines, wherein At least two of the second electrode lines of the second electrode lines are adjacent to and in contact with each other in the first direction. The photovoltaic conversion unit of claim 1, wherein the second electrode lines adjacent to each other and in contact in the first direction are at least line contact. The photovoltaic conversion unit of claim 1, further comprising: a plurality of second electrode line groups, wherein the second electrode line groups are disposed on the solar cell sheet and the first electrode lines along the first direction The second electrode lines are disposed in the second electrode line groups, and at least two of the second electrode lines are disposed in each of the second electrode line groups. For example, in the photovoltaic conversion unit of claim 3, two of the second electrode lines are disposed in each of the second electrode line groups. The photovoltaic conversion unit of claim 3, wherein the second electrode line groups are periodically arranged along the first direction. The photovoltaic conversion unit of claim 3, wherein each of the second electrode line groups is disposed with an equal number of the second electrode lines. The photovoltaic conversion unit of claim 1, wherein each of the second electrode lines has a circular or elliptical cross section in the second direction. A photovoltaic cell module comprising: a plurality of photovoltaic conversion units according to any one of claims 1 to 7, wherein the second electrode lines are electrically connected to adjacent solar cells. The photovoltaic cell module of claim 8, wherein the photovoltaic conversion units constitute a series circuit. A method for fabricating a photovoltaic conversion unit, comprising: arranging a plurality of first electrode lines on a solar cell sheet; and arranging a plurality of second electrode lines adjacent to and contacting each other on the solar cell sheet and the first electrode lines, The extending directions of the first electrode lines and the second electrode lines are orthogonal to each other. The method for fabricating a photovoltaic conversion unit according to claim 10, wherein the adjacent and contacted second electrode lines are formed by a through coating process or an evaporation process. The manufacturing method of the photovoltaic conversion unit of claim 10, wherein the step of disposing the second electrode lines adjacent to and contacting the solar cell sheets and the first electrode lines comprises: After the electrode lines are formed separately, the second electrode lines are disposed on the solar cell sheet and the first electrode lines.