TWI660571B - Solar cell string and method for manufacturing the same - Google Patents

Solar cell string and method for manufacturing the same

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Publication number
TWI660571B
TWI660571B TW107115302A TW107115302A TWI660571B TW I660571 B TWI660571 B TW I660571B TW 107115302 A TW107115302 A TW 107115302A TW 107115302 A TW107115302 A TW 107115302A TW I660571 B TWI660571 B TW I660571B
Authority
TW
Taiwan
Prior art keywords
solar cell
surface
single
attached
electrode
Prior art date
Application number
TW107115302A
Other languages
Chinese (zh)
Inventor
鍾文泰
Original Assignee
茂迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 茂迪股份有限公司 filed Critical 茂迪股份有限公司
Priority to TW107115302A priority Critical patent/TWI660571B/en
Application granted granted Critical
Publication of TWI660571B publication Critical patent/TWI660571B/en

Links

Abstract

A solar cell string includes: a first solar cell and a second solar cell disposed adjacent to each other; a conductive ribbon disposed on a first surface of the first solar cell and a second surface of the second solar cell And a single-sided metal tape, comprising a metal foil and a conductive adhesive layer attached to the metal foil, the single-sided metal tape is located between the first surface and the conductive ribbon, the conductive adhesive layer is located on the metal foil And the first surface, and the conductive ribbon is directly attached to the metal foil.

Description

Solar battery string and manufacturing method thereof

The present invention relates to a solar cell string and a method of manufacturing the same, and more particularly to a solar cell string in which a single-sided metal tape is interposed between a bus electrode and a conductive ribbon.

Referring to FIG. 1, the conventional solar cell module 9 includes a plurality of materials, such as a front glass plate 91, a plurality of solar cells 90, a package material 93, a conductive ribbon 92, a back plate 94, and the like. At present, the solar cells 90 are used as a string bonding connection with the conductive ribbon 92. For the soldering process, busbars 9031 and 9041 are formed on the front surface 903 and the back surface 904 of the solar cells 90. The conductive solder ribbons 92 are soldered to the bus electrodes 9031 and 9041 of the front surface 903 and the back surface 904, respectively. region. After the front surface 903 of the solar cell 90 is soldered, the conductive ribbon 92 must be turned and the back surface 904 of the next solar cell 90 is soldered and repeated several times to complete the string soldering process of the string of solar cells 90.

However, when the conductive ribbon 92 is soldered to the region of the bus electrode, the copper on the bus electrodes 9031, 9041 and the solder on the conductive ribbon 92 form a metal eutectic. Since the reaction for forming the metal eutectic is too intense, the occurrence of cracking of the substrate of the solar cell 90 may occur, thereby reducing the adhesion between the bus electrodes 9031, 9041 and the conductive ribbon 92.

Therefore, there is a need for a solar cell string and a method of manufacturing the same that overcomes the above problems.

It is an object of the present invention to provide a solar cell string in which a single-sided metal tape is interposed between the bus electrode and the conductive ribbon.

According to the above objective, the present invention provides a solar cell string comprising: a first solar cell and a second solar cell disposed adjacent to each other; and a conductive ribbon attached to the first surface of the first solar cell and a second surface of the second solar cell; and a single-sided metal tape comprising a metal foil and a conductive adhesive layer attached to the metal foil, the single-sided metal tape being located on the first surface and the conductive ribbon The conductive adhesive layer is located between the metal foil and the first surface, and the conductive solder ribbon is directly attached to the metal foil.

The addition of the single-sided metal tape of the present invention between the bus electrode and the conductive ribbon still has the following functions: when the conductive metal wire of the solar cell is a copper plating process, the copper on the bus electrode can be prevented from being electrically conductive. When the tin solder on the solder ribbon forms a metal eutectic, the ruthenium substrate ruptures due to the excessively intense reaction. Therefore, the single-sided metal tape of the present invention can serve as a buffer for soldering between the bus electrode and the conductive ribbon to enhance the adhesion between the bus electrode and the conductive ribbon.

1‧‧‧ solar battery string

1'‧‧‧ solar battery string

10‧‧‧ solar cells

10a‧‧‧Solar battery

10b‧‧‧Solar battery

101‧‧‧ first surface

102‧‧‧ second surface

103‧‧‧First electrode layer

1031‧‧‧Concurrent electrode

1032‧‧‧ finger electrode

104‧‧‧Second electrode layer

11‧‧‧ Conductive solder ribbon

111‧‧‧Metal core

112‧‧‧ solder layer

12‧‧‧Single metal tape

121‧‧‧metal foil

122‧‧‧conductive adhesive layer

9‧‧‧Solar battery module

90‧‧‧ solar cells

903‧‧‧ positive

9031‧‧‧Concurrent electrode

904‧‧‧Back

9041‧‧‧Concurrent electrode

91‧‧‧Front glass plate

92‧‧‧ Conductive solder ribbon

93‧‧‧Package

94‧‧‧Back plate

100A~100C‧‧‧Steps

1 is a schematic cross-sectional view of a conventional solar cell module.

2 is a schematic cross-sectional view showing a solar cell string according to a first embodiment of the present invention.

3 is a schematic plan view of a first solar cell according to a first embodiment of the present invention.

4 is a partial cross-sectional view showing the first solar cell of the first embodiment of the present invention.

FIG. 5 is a schematic plan view of a first solar cell according to another embodiment of the present invention, which does not show the conductive ribbon.

Figure 6 is a partial cross-sectional view showing a second solar cell of the first embodiment of the present invention.

Figure 7 is a cross-sectional view showing a solar cell string in accordance with a second embodiment of the present invention.

Figure 8 is a flow chart showing a method of manufacturing a solar cell string according to an embodiment of the present invention.

9 is a cross-sectional view showing a method of manufacturing a solar cell string according to an embodiment of the present invention, showing a first solar cell and a second solar cell being disposed adjacent to each other.

Figure 10 is a cross-sectional view showing a method of manufacturing a solar cell string according to a first embodiment of the present invention, showing a single-sided metal tape attached to a first surface of the first solar cell.

Figure 11 is a plan view of a first solar cell according to a first embodiment of the present invention, showing a single-sided metal tape attached to a first surface of the first solar cell.

The above described objects, features, and characteristics of the present invention will become more apparent from the aspects of the invention.

Please refer to FIG. 2, which shows a schematic cross-sectional view of a solar cell string according to a first embodiment of the present invention. The solar cell string 1 includes a plurality of solar cells 10, at least one conductive ribbon 11 and at least one single-sided metal tape 12. For example, the solar cells 10 include a first solar cell 10a and a second solar cell 10b disposed adjacent to each other, and are single-sided light-receiving solar cells. The conductive ribbon 11 is disposed on the first surface 101 of the first solar cell 10a and the second surface 102 of the second solar cell 10b. The first surface 101 (eg, the back surface) is a polished surface, the second surface 102 (eg, the front surface) is a roughened surface, and the first surface 101 and the second surface 102 are respectively different toward the solar cell string 1 surface.

The single-sided metal tape 12 includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121. The single-sided metal tape 12 is located between the first surface 101 and the conductive ribbon 11 . 122 is located between the metal foil 121 and the first surface 101, and the conductive ribbon 11 is directly attached (for example, soldered) to the metal foil 121. For example, the metal foil 121 can be made of a copper material. The conductive adhesive layer 122 can include a glue layer and a plurality of first conductive particles. The adhesive layer can be made of an epoxy material, and the conductive layers are electrically conductive. The particles can be made of a metal material such as aluminum A group of (Al), silver (Ag), copper (Cu), gold (Au), or a combination thereof. The conductive particles are distributed in the adhesive layer, and the conductive particles can electrically conduct the conductive adhesive layer 122 to the metal foil 121 along a pressing direction. The single-sided conductive tape 12 of this embodiment has only one layer of conductive adhesive.

Please refer to FIG. 3 and FIG. 4, which are schematic cross-sectional views showing a plane and a partial cross section of a first solar cell according to a first embodiment of the present invention. The first solar cell 10a includes a first electrode layer 103 on the first surface 101. The single-sided metal tape 12 is directly attached (eg, bonded) to the first electrode layer 103, and the conductive adhesive layer 122 is directly attached. (for example, bonding) to the first electrode layer 103. The first electrode layer 103 includes a bus electrode 1031 and a plurality of finger electrodes 1032 cross-connected to the bus electrode 1031. The single-sided metal tape 12 is directly attached (eg, bonded) to the bus electrode 1031. The conductive ribbon 11 includes a metal core 111 and a solder layer 112 surrounding the metal core 111, and the solder layer 112 directly contacts a region of the bus electrode 1031. The metal core 111 can be a copper metal material, and the solder layer 112 can be a tin solder.

The single-sided metal tape 12 of the present invention is added between the bus electrode 1031 and the conductive ribbon 11 to have the following functions: First, when the conductive metal wire applied to the solar cell is formed by a copper plating process, the bus electrode can be prevented. When the copper on the 1031 and the tin solder on the conductive ribbon 11 form a metal eutectic, the ruthenium substrate is broken due to excessive reaction. Therefore, the single-sided metal tape 12 of the present invention can serve as a buffer for soldering between the bus electrode 1031 and the conductive ribbon 11 to enhance the adhesion between the bus electrode 1031 and the conductive ribbon 11. Secondly, when the conductive metal wire is formed by re-sintering the screen printing silver paste, the single-sided metal tape 12 is added between the bus electrode 1031 and the conductive ribbon 11 to use a confluence with a thin silver wire. The electrode not only maintains the tensile force (i.e., adhesion) between the bus electrode 1031 and the conductive ribbon 11, but also reduces the use of the silver paste.

Please refer to FIG. 5, which shows a schematic plan view of a first solar cell according to another embodiment of the present invention, which does not show the conductive ribbon 11. The single-sided metal tape 12 is divided into a plurality of sections and attached to different regions of the bus electrode 1031. The single-sided metal tape The relative ratio of the length of each segment of 12 to the bus electrode 1031 can be adjusted by visual adhesion and efficiency requirements.

Referring to FIG. 6 and FIG. 2, the second solar cell 10b includes a second electrode layer 104 on the second surface 102. The conductive ribbon 11 is directly in contact with (eg, soldered) to the second electrode layer 104. The single-sided metal tape 12 of the present invention can be used only on a side having a poor adhesion, such as a bus electrode having a back surface on a polished surface. On the other hand, the bus electrode on the front surface having the roughened surface may not use the single-sided metal tape 12 of the present invention when the adhesion is satisfied to ensure process efficiency, thereby avoiding an increase in cost.

The foregoing description is exemplified by a single-sided light-receiving solar cell having a roughened front surface and a polished back surface, but the present invention can also be applied to a solar cell structure in which both sides are roughened or both surfaces are polished surfaces, and further, The solar cells of these structures may also have different adhesions between the front and back surfaces to the conductive ribbon due to the electrode material, process or other factors. Similarly, only one side of the metal tape may be used on the less adherent side, thereby improving the entire The reliability of the battery string avoids adding too much cost, or, by using the welded structure of the present invention, the manufacturer can select an electrode process or a conductive paste formulation which cannot be used for mass production due to poor adhesion, and can improve design flexibility. And further reduce costs.

Please refer to FIG. 7, which is a cross-sectional view showing a solar cell string according to a second embodiment of the present invention. The solar cell string 1' of the second embodiment is substantially similar to the solar cell string 1 of the first embodiment, and similar elements are denoted by similar reference numerals, the main difference being: the first solar cell 10a of the second embodiment And the second solar cell 10b is a double-sided light-receiving solar cell. The first surface 101 is a roughened surface, the second surface 102 is a roughened surface, and the first surface 101 and the second surface 102 face different faces of the solar cell string 1', respectively. The first solar cell 10a includes a first electrode layer 103 on the first surface 101. The single-sided metal tape 12 is directly attached (eg, bonded) to the bus electrode of the first electrode layer 103. The second solar cell 10b includes a second electrode layer 104 on the second surface 102, and the other single-sided metal tape 12 is directly attached (eg, bonded) to the second The electrode layer 104 is directly attached (eg, bonded) to the second electrode layer 104. The second electrode layer 104 also includes a bus electrode (not shown) and a plurality of finger electrodes (not shown) connected to the bus electrode. The other single-sided metal tape 12 is directly attached (for example, bonded). The bus electrode of the second electrode layer 104.

The other single-sided metal tape 12 also includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121 . The other single-sided metal tape 12 is located between the second surface 104 and the conductive ribbon 11 . The conductive adhesive layer 122 of the other single-sided metal tape 12 is located between the metal foil 121 and the second surface 104, and the conductive ribbon 11 is directly attached (for example, soldered) to the other single-sided metal tape 12 Metal foil 121. In addition, the solar cell string in the second embodiment may also adopt the method of FIG. 5 , that is, the other single-sided metal tape covers only a part of the bus electrode of the second electrode layer, according to the adhesion and cost consideration, FIG. 5 The method can be used only for the strong adhesion between the solar cell and the conductive ribbon to reduce the cost, or the method of Figure 5 can be used on both sides of the solar cell, but on the weaker side, the single-sided metal tape The area ratio of the covered bus electrodes is high.

The soldering structure of the foregoing second embodiment can also be used for a solar cell structure having a polished surface on both sides and a solar cell structure in which one side is a rough surface and the other side is a polished surface, and the surface of the conductive ribbon and the solar cell can be improved. Inter-adhesion or increased flexibility in design selection.

Fig. 8 is a flow chart showing a method of manufacturing a solar cell string according to an embodiment of the present invention. The method for manufacturing the solar cell string includes the following steps:

Referring to FIG. 9, in step 100A, a first solar cell 10a and a second solar cell 10b are disposed adjacent to each other. For example, the solar cells 10a, 10b include a photoelectric conversion substrate, a front electrode (ie, the second electrode 103), and a back electrode (ie, the first electrode 104). The front electrode is located on a front side (ie, the second surface 102) of the photoelectric conversion substrate, and the back electrode is located on a back surface (ie, the first surface 101) of the photoelectric conversion substrate. The photoelectric conversion substrate 11 refers to a substrate capable of converting light energy into electrical energy by a photovoltaic effect, that is, a germanium substrate having a PN junction (P/N junction) or a PIN junction (PIN junction), such as a single crystal. A germanium or polycrystalline germanium substrate having an emitter layer (not shown) and a back field layer (not shown). The main body portion of the germanium substrate and the back electric field layer may be of a first conductivity type, the emitter layer may be of a second conductivity type and located in the germanium substrate near the front surface, and the back electric field layer is located in the germanium substrate Close to the back.

Referring to FIG. 10 and FIG. 11 , in step 100B , a single-sided metal tape 12 is attached to one of the first surfaces 101 of the first solar cell 10a, wherein the single-sided metal tape 12 includes a metal foil 121 and A conductive adhesive layer 122 is attached to one of the metal foils 121, and the conductive adhesive layer 122 is attached to the first surface 101 after being attached. In this embodiment, the first solar cell 10a and the second solar cell 10b may be a single-sided light-receiving solar cell, the first surface 101 is a polished surface, and the second surface 102 is a roughened surface, and the The first surface 102 and the second surface 102 face different faces of the solar cell string, respectively. The first solar cell 10a includes a first electrode layer 103 on the first surface 101. In step 100B, the single-sided metal tape 12 is attached to the first electrode layer 103, and the conductive adhesive layer 122 It is attached to the first electrode layer 103. In detail, the first electrode layer 103 includes a bus electrode 1031 and a plurality of finger electrodes 1032 cross-connected to the bus electrode 1031. In step B, the single-sided metal tape 12 is attached to the bus electrode 1031. .

In another embodiment, in step 100B, the single-sided metal tape 12 is divided into a plurality of sections attached to different regions of the bus electrode 1031, as shown in FIG.

In another embodiment, in step 100B, the first solar cell 10a and the second solar cell 10b may be double-sided light-receiving solar cells, and the first surface 101 is a roughened surface, and the second surface 102 is A roughened surface, and the first surface 101 and the second surface 102 respectively face different faces of the solar cell string 1, as shown in FIG.

In other embodiments, in step 100B, the second solar cell 10b includes a second electrode layer 104 on the second surface 102, and another single-sided metal tape 12 is directly attached to the second electrode layer 104. The conductive adhesive layer 12 is directly attached to the second electrode layer 104. The second electrode layer 104 also includes a bus electrode (not shown) and a plurality of finger electrodes (not shown) cross-connected to the bus electrode, the other The single-sided metal tape 12 is directly attached to the bus electrode as shown in FIG.

In step 100C, a conductive ribbon 11 is directly attached to the metal foil 121 and attached to the second surface 102 of the second solar cell 10b by soldering, so as to complete the electrical connection of the solar cells. As shown in Figure 2 and Figure 3. In this embodiment, the second solar cell 10b includes a second electrode layer 104 on the second surface 102. After the step 100C, the conductive ribbon 11 directly contacts the second electrode layer 104, and the conductive bonding The tape 11 directly contacts the metal foil 121 as shown in FIG.

In another embodiment, the other single-sided metal tape 12 also includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121. The other single-sided metal tape 12 is located on the second surface 102 and the Between the conductive strips 11, the conductive adhesive layer 122 of the other single-sided metal tape 12 is located between the metal foil 121 and the second surface 102, and the conductive ribbon 11 is directly attached to the other single-sided metal tape. 12 metal foil 121, as shown in FIG.

In addition, an array of the plurality of solar cell strings is tiled between a back sheet/package and a front glass sheet/a package, and a layer of pressing is performed to form a solar cell module. During the pressing process of the layer, the conductive adhesive layer 122 of the other single-sided metal tape 12 is also pressed again, which ensures electrical connection of the plurality of solar cells.

In summary, the present invention is only described as a preferred embodiment or embodiment of the technical means for solving the problem, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention.

Claims (9)

  1. A solar cell string comprising: a first solar cell and a second solar cell disposed adjacent to each other; a conductive ribbon disposed on a first surface of the first solar cell and a second of the second solar cell And a single-sided metal tape comprising a metal foil and a conductive adhesive layer attached to the metal foil, the single-sided metal tape being located between the first surface and the conductive ribbon, the conductive adhesive layer being located on the metal Between the foil and the first surface, and the conductive ribbon is directly attached to the metal foil; wherein: the first solar cell comprises a first electrode layer on the first surface, the single-sided metal tape is directly attached to The first electrode layer is directly attached to the first electrode layer; the first electrode layer includes a bus electrode and a plurality of finger electrodes cross-connected to the bus electrode, and the single-sided metal tape is directly attached And the single-sided metal tape is divided into a plurality of sections and attached to different regions of the bus electrode.
  2. The solar cell string of claim 1, wherein the conductive ribbon comprises a metal core and a solder layer surrounding the metal core, and the solder layer directly contacts a region of the bus electrode.
  3. The solar cell string of claim 2, wherein the first surface is a polished surface.
  4. The solar cell string of claim 3, wherein the second surface is a roughened surface, and the first surface and the second surface respectively face different faces of the solar cell string.
  5. The solar cell string of claim 4, wherein the second solar cell comprises a second electrode layer on the second surface, the conductive ribbon being directly in contact with the second electrode layer.
  6. A solar cell string manufacturing method comprising the following steps: Step A: arranging a first solar cell and a second solar cell adjacent to each other; Step B: attaching a single-sided metal tape to the first surface of one of the first solar cells, wherein the single-sided metal tape comprises a metal foil and a conductive adhesive layer attached to the metal foil, the conductive adhesive layer being attached to the first surface after being attached, wherein: the first solar cell comprises a first electrode layer on the first surface In step B, the single-sided metal tape is attached to the first electrode layer, and the conductive adhesive layer is attached to the first electrode layer; the first electrode layer includes a bus electrode and is cross-connected thereto a plurality of finger electrodes of the bus electrode, the single-sided metal tape is attached to the bus electrode in step B; and in step B, the single-sided metal tape is divided into a plurality of sections attached to different regions of the bus electrode; And step C: directly attaching a conductive ribbon to the metal foil and attaching to a second surface of the second solar cell by soldering.
  7. The method of manufacturing a solar cell string according to claim 6, wherein the first surface is a polished surface.
  8. The solar cell string manufacturing method of claim 7, wherein the second surface is a roughened surface, and the first surface and the second surface respectively face different faces of the solar cell string.
  9. The method for manufacturing a solar cell string according to claim 8, wherein the second solar cell comprises a second electrode layer on the second surface, and after the step C, the conductive ribbon directly contacts the second electrode. An electrode layer, and the conductive ribbon directly contacts the metal foil.
TW107115302A 2018-05-04 2018-05-04 Solar cell string and method for manufacturing the same TWI660571B (en)

Priority Applications (1)

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TW107115302A TWI660571B (en) 2018-05-04 2018-05-04 Solar cell string and method for manufacturing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW107115302A TWI660571B (en) 2018-05-04 2018-05-04 Solar cell string and method for manufacturing the same

Publications (1)

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TWI660571B true TWI660571B (en) 2019-05-21

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM416200U (en) * 2011-04-27 2011-11-11 A2Peak Power Co Ltd Solar cell module
TW201445756A (en) * 2013-03-22 2014-12-01 3M Innovative Properties Co Solar cells and modules including conductive tapes and methods of making and using same
TW201446934A (en) * 2006-04-26 2014-12-16 Hitachi Chemical Co Ltd Adhesive tape and solar cell module using the same
TW201611317A (en) * 2014-05-27 2016-03-16 科根納太陽能公司 Shingled solar cell module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201446934A (en) * 2006-04-26 2014-12-16 Hitachi Chemical Co Ltd Adhesive tape and solar cell module using the same
TWM416200U (en) * 2011-04-27 2011-11-11 A2Peak Power Co Ltd Solar cell module
TW201445756A (en) * 2013-03-22 2014-12-01 3M Innovative Properties Co Solar cells and modules including conductive tapes and methods of making and using same
TW201611317A (en) * 2014-05-27 2016-03-16 科根納太陽能公司 Shingled solar cell module

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