ES2449141T3 - Connection between solar cells in a module that uses thermal compression joint and said manufactured module - Google Patents

Connection between solar cells in a module that uses thermal compression joint and said manufactured module Download PDF

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Publication number
ES2449141T3
ES2449141T3 ES08252624.5T ES08252624T ES2449141T3 ES 2449141 T3 ES2449141 T3 ES 2449141T3 ES 08252624 T ES08252624 T ES 08252624T ES 2449141 T3 ES2449141 T3 ES 2449141T3
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Spain
Prior art keywords
wiring element
direction
adhesive resin
solar cell
solar cells
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Active
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ES08252624.5T
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Spanish (es)
Inventor
Atsushi Saita
Yukihiro Yoshimine
Shigeyuki Okamoto
Yasufumi Tsunomura
Shigeharu Taira
Hiroshi Kanno
Haruhisa Hashimoto
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Priority to JP2007202265 priority Critical
Priority to JP2007202265 priority
Priority to JP2007341070A priority patent/JP5288790B2/en
Priority to JP2007341070 priority
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Application granted granted Critical
Publication of ES2449141T3 publication Critical patent/ES2449141T3/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/52Manufacturing of products or systems for producing renewable energy
    • Y02P70/521Photovoltaic generators

Abstract

Solar cell module comprising first and second solar cells arranged in a line in a first direction and a wiring element that electrically connects the first and second solar cells, in which the first and second solar cells each include a part of Photoelectric conversion configured to produce photogenerated carriers upon receiving light and a collection electrode that is formed on a main surface of the photoelectric conversion part and that is configured to collect the photogenerated carriers, the wiring element is provided in the first direction on the main surfaces of the first and second solar cells, an adhesive resin is provided between the wiring element and the main surfaces of the first and second solar cells in which said adhesive resin may contain a plurality of conductive particles, characterized by the fact that: a circumfe A cross section of the wiring element is convexly formed towards the first and second solar cells, the cross section being perpendicular to the first direction, and in a second direction perpendicular to the first direction, a width of a connection zone (W1) in which the wiring element and the pick-up electrode are electrically connected is greater than one half of a width (W2) of the wiring element that can be printed under high pressure; wherein when the adhesive resin includes a plurality of conductive particles, the connection zone is an area in which a distance between the wiring element and the collection electrode is the same as or less than that of the diameter of the conductive particles in the cross section perpendicular to the first direction and when the adhesive resin does not include a plurality of conductive particles, the connection zone is an area formed by embedding a portion of a thin wire electrode (30) in the wiring element.

Description

Connection between solar cells in a module that uses thermal compression joint and said manufactured module.

[0001] The present invention relates to a solar cell module in which an adhesive resin is provided between a wiring element and a main surface of a solar cell and a method of manufacturing the solar cell module.

[0002] A solar cell can directly convert sunlight, which is a clean and unlimited energy, into electricity. Therefore, the solar cell is expected to be a new source of energy.

[0003] In general, the energy production of a solar cell is approximately several watts. Therefore, as a source of energy for a house, a building or the like, a solar cell module is used that includes multiple solar cells connected to each other to provide greater power. A solar cell module is configured by connecting multiple solar cells arranged in one or more lines in a first direction by using wiring elements. Wiring elements are generally welded on the main surfaces of solar cells.

[0004] In this regard, a technique has been described in which a resin adhesive element, which is thermosetting at a temperature lower than a welding melting temperature, is inserted between a wiring element and a main surface of a solar cell in order to make the wiring element thermally adhere to the main surface of the solar cell (see, for example, Japanese Patent Application No. 2005-101519).

[0005] According to this technique, an impact of temperature change, caused by the thermal adhesion of the wiring element, on the solar cell can be made smaller than the case in which the wiring element is welded directly on it.

[0006] In general, the surfaces of the wiring element are flat. Therefore, when the wiring element is thermally adhered to the main surface of the solar cell, a pressure is also applied to the adhesive resin. For this reason, gas bubbles trapped in the edge portions of the adhesive resin are easily removed, but gas bubbles trapped in a central portion of the resin adhesive are barely removed. Accordingly, gas bubbles trapped in the central portion of the resin adhesive element can remain as a mass (cavity). This reduces the area of adhesion between the wiring element and the solar cell, and, as a consequence, the conventional technique has the disadvantage of causing a decrease in the capture efficiency of the solar cell and a decrease in the adhesiveness of the wiring element .

[0007] JP-A-11-21660 describes a solar cell module with solar cells interconnected by a wiring element, and with an adhesive resin between the main surface of the solar cells and the wiring element.

[0008] According to a first aspect of the invention there is provided a solar cell module comprising first and second solar cells arranged in a line in a first direction and a wiring element that electrically connects the first and second solar cells, in the that the first and second solar cells each include a photoelectric conversion part configured to produce photogenerated carriers upon receiving light and a collection electrode that is formed on a main surface of the photoelectric conversion part and that is configured to collect the photogenerated carriers , the wiring element is provided in the first direction on the main surfaces of the first and second solar cells, an adhesive resin is provided between the wiring element and the main surfaces of the first and second solar cells in which said adhesive resin may contain a plurality of part conductive cells, in which: a circumference of a cross section of the wiring element is convexly formed towards the first and second solar cells, the cross section being perpendicular to the first direction, and in a second direction perpendicular to the first direction , a width of a connection zone in which the wiring element and the pick-up electrode are electrically connected is greater than one half of a width of the wiring element that can be printed under high pressure; wherein when the adhesive resin includes a plurality of conductive particles, the connection zone is an area in which a distance between the wiring element and the collection electrode is the same as or less than that of the diameter of the conductive particles in the cross section perpendicular to the first direction and when the adhesive resin does not include a plurality of conductive particles, the connection zone is an area formed by embedding a portion of a thin wire electrode in the wiring element.

[0009] With the present invention, it is possible to provide a solar cell module in which the capture efficiency of the solar cell and the adhesion capacity of the wiring element are improved by degassing the resin element.

[0010] In the first aspect of the present invention, thin wire electrodes are configured to collect the photogenerated carriers from the photoelectric conversion part and there is a connection electrode configured to pick up the photogenerated carriers of the thin wire electrodes. The connection electrode may be formed in the first direction, the wiring element is provided on the connection electrode. The adhesive resin may include a plurality of conductive particles. The connection zone may be formed by the particles included in the adhesive resin. Furthermore, it is preferred that the connection electrodes have a convexly shaped protruding portion formed towards the wiring element, the protruding portion is formed on an edge portion of the connecting electrode in the second direction, and the protruding portion sinks into the wiring element.

[0011] According to a second aspect of the invention there is provided a method for manufacturing a solar cell module that includes first and second solar cells arranged in a line in a first direction and a wiring element that electrically connects the first and first solar cells second, whose wiring element can be printed under high pressure, the process comprising the steps of:

(TO)
 manufacturing the first and second solar cells forming a collection electrode configured to collect photogenerated carriers on a main surface of a photoelectric conversion part configured to produce the photogenerated carriers upon receiving light; Y

(B)
thermocompressively joining the wiring element on main surfaces of the first and second solar cells in the first direction with an adhesive resin, adhesive resin that can contain a plurality of conductive particles in which in the stage of (B), a circumference of a cross section of the wiring element is convexly formed towards the first and second solar cells, the cross section being substantially perpendicular to the first direction, and a width of a connection zone in which the wiring element and the electrode of connection are electrically connected is established wider than one half of a width of the wiring element, in a second direction perpendicular to the first direction; wherein when the adhesive resin includes a plurality of conductive particles, the connection zone is an area in which a distance between the wiring element and the collection electrode is the same as or less than that of the diameter of the conductive particles in the cross section perpendicular to the first direction and when the adhesive resin does not include a plurality of conductive particles, the connection zone is an area formed by embedding a portion of a thin wire electrode in the wiring element.

[0012] According to the procedure described above for manufacturing a solar cell module, the circumference of the wiring element is convexly formed towards the collection electrode. Therefore, in the thermocompression joint process of the wiring element, a pressure is first applied to the central portion of the second direction of the adhesive resin and then gradually to edge portions thereof. In other words, the edge portions of the adhesive resin are heat pressed behind the central portion thereof.

[0013] Accordingly, a gas trapped in the adhesive resin is gradually pushed out from the central portion to the edge portions. In other words, the degassing of the adhesive resin is carried out gradually from the central part to the edge portions. As described above, degassing of the adhesive resin is promoted. In this way, the presence of a mass of residual gas such as a cavity in the adhesive resin can be avoided after the thermocompression joining process of the wiring element.

[0014] In addition, in the thermocompression joint process of the wiring element, the width of the connection area is adjusted to be wider than substantially one half of a width of the wiring element. In this way, the electrical connection between the wiring element and the collection electrode can be sufficiently secured.

[0015] In the second aspect of the present invention, the adhesive resin may include a plurality of conductive particles. in the step of (B), the width of the connection zone is established wider than substantially one half of a width of the wiring element by establishing a diameter of each particle included in the adhesive resin at a predetermined or greater diameter.

[0016] In the second aspect of the present invention, in the step of (B), the width of the connection zone is established wider than substantially one half of a width of the wiring element by establishing a pressure for thermocompressive joining the wiring element on the main surfaces of the first and second solar cells at a predetermined or greater pressure.

In the drawings Figure 1 is a side view of a solar cell module 100 according to a first embodiment of the present invention; Figure 2 is a plan view of a solar cell 10 according to the first embodiment of the present invention; Figure 3 is a cross section taken along line A-A in Figure 2; Figure 4 is a view showing a state in which a wiring element 11 is connected to an electrode of connection 40 of Figure 2; Figure 5 is an enlarged cross section taken along the line B-B in Figure 4; Figure 6 is a view to illustrate a process for manufacturing the solar cell module 100 according to the first embodiment of the present invention;

Figure 7 is an enlarged cross section of a solar cell module 100 according to a second embodiment of the present invention; Fig. 8 is a side view of a solar cell module 200 according to a third embodiment of the present invention; Figure 9 is a plan view of a solar cell 10 according to the third embodiment of the present invention; Figure 10 is a view showing a state in which a wiring element 11 is attached to a solar cell 10 according to the third embodiment of the present invention; Figure 11 is a cross section taken along the line D-D in Figure 10; Y Figure 12 is a cross section taken along the line E-E in Figure 10.

[0017] Preferred embodiments of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same or similar reference numbers are given to denote equal or similar parts. It should be noted that the drawings are merely schematic and the proportions of sizes and the like are different from the real ones. Therefore, specific or similar sizes should be determined with reference to the following description. In addition, parts are obviously included in which the ratios or proportions of sizes are different between drawings.

1. First embodiment (Schematic configuration of a solar cell module)

[0018] A schematic configuration of a solar cell module 100 according to a first embodiment of the present invention will be described below with reference to Figure 1. Figure 1 is an enlarged side view of the solar cell module 100 according to the present embodiment. .

[0019] The solar cell module 100 includes a solar cell strip 1, a lateral light receiving surface protection element 2, a rear surface lateral protection element 3, and a sealing element 4. The cell module solar 100 is configured causing the solar cell strip 1 to be sealed between the side surface protection element receiving light 2 and the side surface protection element 3.

[0020] The solar cell strip 1 includes multiple solar cells 10, wiring elements 11, and an adhesive resin 12. The solar cell strip 1 is configured by connecting the multiple solar cells 10 arranged in the first by means of the wiring elements 11 address.

[0021] The solar cell 10 has a light receiving surface into which sunlight enters and a rear surface provided on the opposite side of the light receiving surface. The light receiving surface and the rear surface are main surfaces of the solar cell 10. A collection electrode is formed on the light receiving surface and the rear surface of the solar cell 10. The configuration of the solar cell 10 is will describe later.

[0022] The wiring element 11 is attached to the collection electrode formed on the light receiving surface of a solar cell 10 and the collection electrode formed on the rear surface of another solar cell 10 adjacent to the first solar cell. Thus, the first solar cell 10 and the other solar cell 10 are electrically connected. The wiring element 11 includes a low sheet-shaped resistivity (such as copper) and a soft conductor (such as an eutectic weld) that is deposited on the low resistivity surface.

[0023] The adhesive resin 12 is provided between the wiring element 11 and the solar cell 10. In other words, the wiring element 11 is attached to the solar cell 10 using the adhesive resin 12. Preferably, the adhesive resin 12 it should be cured at a temperature equal to or less than the melting point of the eutectic weld, that is, at a temperature equal to or less than about 200 ° C. As adhesive resin 12, for example, a two-part reactive adhesive can be used in which a curable material is mixed in an epoxy zone, acrylic resin, or urethane resin in addition to a thermosetting adhesive resin such as an acrylic resin or resin a Polyurethane base that has great flexibility. In the present embodiment, an adhesive in the form of a film film on tape consisting mainly of an epoxy resin is used as adhesive resin 12.

[0024] In addition, adhesive resin 12 includes several conductive particles. Nickel, gold-coated nickel, or the like can be used as conductive particles.

[0025] The lateral light receiving surface protection element 2 is arranged on the light receiving surface side of the sealing element 4 to protect the surface of the solar cell module

100. A translucent or water-proof glass, a translucent plastic or the like can be used as a lateral protection element of the light receiving surface 2.

[0026] The rear surface side protection element 3 is arranged on the rear surface side of the sealing element 4 to protect the rear surface of the solar cell module 100. As a rear surface side protection element 3, it can be used a resin film, such as PET (polyethylene terephthalate) or a layered film having a structure in which an aluminum foil is sandwiched between resin films.

[0027] The sealing element 4 seals the solar cell strip 1 between the lateral light receiving surface protection element 2 and the rear surface lateral protection element 3. As sealing element 4, a resin can be used translucent, such as EVA, EEA, PVB, silicon, urethane, acryl, epoxy, or the like.

[0028] In addition, an aluminum frame (not shown) can be adhered to the circumference of the solar cell module 100 which has a configuration described above. (Solar cell configuration)

[0029] Next, the configuration of the solar cell 10 will be described with reference to Figure 2. Figure 2 is a plan view of the solar cell 10.

[0030] As shown in Figure 2, the solar cell 10 includes a photoelectric conversion part 20, thin cable electrodes 30, and connection electrodes 40.

[0031] The photoelectric conversion part 20 produces photogenerated carriers upon receiving sunlight. Photogenerated carriers mean electron holes and electrons produced when sunlight is absorbed by the photoelectric conversion part 20. The photoelectric conversion part 20 has a zone of type n and a zone of type p inside, and a junction of semiconductor is formed in an interface between the zone of type n and the zone of type p. The photoelectric conversion part 20 can be formed using a semiconductor substrate made of a semiconductor crystalline material, such as a single polycrystalline Si or Si crystal, or a composite semiconductor material, such as a composite semiconductor material, for example, of GaAs or InP . It should be noted that the photoelectric conversion part 20 may have a structure in which the characteristics of a hetero-junction interface are improved by inserting a substantially intrinsic amorphous silicon layer between a single crystal silicon substrate and a layer of amorphous silicon, that is, a so-called hetero-union with intrinsic thin layer structure (HIT).

[0032] The thin wire electrode 30 is an electrode configured to pick up the photogenerated carriers from the photoelectric conversion part 20. As shown in Figure 2, the thin wire electrodes 30 are formed in a line along a second address substantially perpendicular to the first address. Several thin wire electrodes 30 are formed through substantially the entire area of the light receiving surface of the photoelectric conversion part 20. The thin wire electrode 30 can be formed by using a resin-like conductive paste in the that a resin material is used as a binder and a conductive particle such as a silver particle is used as filler material. As shown in Figure 1, thin wire electrodes 30 are formed similarly on the light receiving surface and the back surface of the photoelectric conversion part 20.

[0033] The connection electrode 40 is an electrode configured to pick up the photogenerated carriers from the multiple thin cable electrodes 30. As shown in Figure 2, the connection electrodes 40 are formed along the first direction for intersect with thin wire electrodes 30. The connection electrodes 40 can be formed by the use of a resin-like conductive paste in which a resin material is used as a binder and a conductive particle such as a silver particle is used as Filling material. In addition, the connection electrodes 40 are also formed on the rear surface of the photoelectric conversion part 20 (See Figure 1).

[0034] Here, the number of connection electrodes 40 can be determined as appropriate taking into account the size of the photoelectric conversion part 20 or the like. The solar cell 10 according to the present embodiment includes two connection electrodes 40. Accordingly, the multiple thin cable electrodes 30 and the connection electrodes 40 are formed in the form of a grid on the light receiving surface and the rear surface of the photoelectric conversion part 20.

[0035] Next, it will be described as an example of the configurations of the solar cell 10, the case in which the photoelectric conversion part 20 has the HIT structure with reference to Figure 3. Figure 3 is an enlarged cross-section taken along the line AA in figure 2.

[0036] As shown in Figure 3, the photoelectric conversion part 20 includes an ITO film 20a, an amorphous silicon layer of type p 20b, an amorphous silicon layer of type i 20c, a crystal silicon substrate single type n 20d, a layer of amorphous silicon type i 20e, a layer of amorphous silicon type n 20f, and an ITO 20g film.

[0037] The amorphous silicon layer of type p 20b is formed on the light receiving surface side of the single crystal silicon substrate of type n 20d through the amorphous silicon layer of type i 20c. The ITO film 20a is formed on the side of the light receiving surface of the p 20b amorphous silicon layer. In contrast, the amorphous silicon layer of type n 20f is formed on the back surface side of the single crystal silicon substrate of type n 20d through the amorphous silicon layer of type i 20e. The ITO 20g film is formed on the back surface side of the amorphous silicon layer of type n 20f.

[0038] The thin cable electrodes 30 and the connection electrodes 40 are formed on each side of the light receiving surface of the ITO film 20a and the rear surface side of the ITO film 20g.

[0039] The solar cell module 100 having the solar cell 10 with the configuration described above is called the HIT solar cell module. (Configuration of the solar cell strip)

[0040] Next, the configuration of the solar cell strip 1 will be described with reference to Figures 4 and 5. Figure 4 is a view showing a state in which the wiring elements 11 are arranged on the electrode of connection 40 shown in figure 2. Figure 5 is an enlarged cross section taken along line BB in figure 4.

[0041] As shown in Figure 4, the adhesive resin 12 is provided on the connecting electrode 40 formed in a line shape along the first direction. In Figure 4, a width of the adhesive resin 12 is adjusted to be wider than a width of the connecting electrode 40 in the second direction. However, the configuration is not limited to this.

[0042] In addition, the wiring element 11 is arranged along the connecting electrode 40 on the adhesive resin 12. In other words, the wiring element 11 is arranged in the first direction on the main surface of the solar cell 10. A width of the wiring element 11 in the second direction is substantially the same as a width of the connecting electrode 40.

[0043] As described above, the connecting electrode 40, the adhesive resin 12, and the wiring element 11 are sequentially arranged on the photoelectric conversion part 20. The wiring element 11 and the connecting electrode 40 are electrically connected

[0044] As shown in Figure 5, the wiring element 11 includes a low resistivity 11a, a soft conductor 11b, and a soft conductor 11c. The soft conductor 11b is positioned between the low resistivity 11a and the solar cell 10, while the soft conductor 11c is positioned on the low resistivity 11a. A width of the wiring element 11 in the second direction is W2.

[0045] A thickness T1 of the soft conductor 11b gradually becomes smaller from the central portion of the second direction to each edge portion of the second direction according to a third direction substantially vertical to the main surface of the solar cell 10, that is, in the thickness direction. Accordingly, the circumference of cross section substantially perpendicular to the first direction of the wiring element 11 is convexly formed towards the solar cell 10. As shown in Figure 5, the wiring element 11 has similar external shapes on the side of the light receiving surface and the rear surface side.

[0046] The adhesive resin 12 is inserted between the wiring element 11 and the solar cell 10. In addition, the adhesive resin 12 includes several conductive particles 13. As shown in Figure 5, the various particles 13 include particles embedded in the soft conductor 11b, sandwich particles 13 arranged between the soft conductor 11b and the connecting electrode 40, or particles 13 embedded in the adhesive resin 12.

[0047] In the present embodiment, an area in which the soft conductor 11b and the connecting electrode 40 are electrically connected is called a connection zone C. The connection zone C is formed by the particles 13 embedded in the soft conductor 11b and the sandwich particles 13 arranged between the soft conductor 11b and the connection electrode 40. Accordingly, the connection zone C is an area in which a distance between the soft conductor 11b and the connection electrode 40 is substantially the same as or less than the diameter of the particle 13 in the cross section substantially perpendicular to the first direction.

[0048] Here, a width W1 of the connection zone C in the second direction is greater than substantially one half of the width W2 (W2 / 2) of the wiring element 11. In other words, on the two edges of the connection zone C, the distance between the particles 13 each sandwiched between the soft conductor 11b and the connection electrode 40 is greater than substantially half the width W2 of the wiring element 11.

(Procedure to manufacture the solar cell module)

[0049] Next, a process for manufacturing the solar cell module 100 according to the present embodiment will be described.

[0050] First, a single crystal silicon substrate of type 20d is processed in a 100 mm square by anisotropic attack by using an alkaline solution. In this way, small convexities and concavities are formed on the light receiving surface of the single crystal silicon substrate of type n 20d. Then, the light receiving surface of the single crystal silicon substrate type n 20d is cleaned to remove impurities.

[0051] Subsequently, the amorphous silicon layer of type i 20c and the amorphous silicon layer of type p 20b are sequentially layered on the side of the light receiving surface of the single crystal silicon substrate type n 20d using a CVD (chemical vapor deposition) procedure. Similarly, the amorphous silicon layer of type i 20e and the amorphous silicon layer of type n 20f are sequentially layered on the back surface side of the single crystal silicon substrate of type n 20d.

[0052] Next, the ITO film 20a is formed on the side of the light receiving surface of the p-20b amorphous silicon layer using a PVD (physical vapor deposition) procedure. Similarly, the ITO 20g film is formed on the back surface side of the amorphous silicon layer of type n 20f. As described above, the photoelectric conversion part 20 is manufactured.

[0053] Next, an epoxy-based thermosetting silver paste is disposed with a predetermined pattern on the light receiving surface and back surface of the photoelectric conversion part 20 using a printing method, such as a screen procedure. printing or an offset printing procedure. As shown in Figure 2, the predetermined pattern means a grid shape, which is formed by two connecting electrodes 40 that extend along the first direction and by the multiple thin-wire electrodes 30 that extend to along the second direction.

[0054] The silver paste is heated under a predetermined condition to volatilize the solution, and then further heated to be completely dried. In this way, solar cell 10 is manufactured.

[0055] Next, as shown in Figure 6, the wiring element 11 is thermally compressed on the connecting electrode 40 using the adhesive resin 12 which includes the various particles 13. Thus, the wiring element 11 and solar cell 10 are connected mechanically and electrically. In particular, first, the adhesive resin 12 and the wiring element 11 are arranged sequentially on the connection electrode 40 formed on the light receiving surface and the rear surface of the photoelectric conversion part 20. Subsequently, the element of wiring 11 is printed for approximately 15 seconds on the solar cell 10 by a heating block 50 that is heated to approximately 180 ° C. In this way, the various particles 13 are embedded inside the soft conductor 11b and are sandwiched between the soft conductor 11b and the connecting electrode 40.

[0056] The Mohs hardness of the nickel which is a material for the particles 13 is 3.5, the Mohs hardness of the welding material that is a soft conductor material 11b is 1.8, and the Mohs hardness of the silver paste which It is a material for the connecting electrode 40 is 2.5. For this reason, the particles 13 are embedded in the soft conductor 11b by printing the wiring element 11 on the solar cell 10.

[0057] Here, the wiring element 11 and the solar cell 10 are electrically connected by the connection zone C in which a distance between the soft conductor 11b and the connection electrode 40 is substantially the same or less than the diameter of the particle 13. In the present embodiment, the width W1 of the connection zone C is adjusted to be wider than substantially one half of the width W2 of the wiring element 11 in the second direction. Specifically, the following three approaches can be used in order to make the width W1 of the connection zone C substantially wider than half the width W2 of the wiring element 11.

[0058] In the first approach, a pressure for printing the wiring element 11 on the solar cell 10 over the heating block 50 is set equal to or greater than a predetermined value. In the second approach, a diameter of the particle 13 included in the adhesive resin 12 is set equal to or greater than a predetermined diameter. In the third approach, a curvature of the cross-sectional circumference substantially perpendicular to the first direction of the wiring element 11 becomes smaller. In other words, the third approach uses an almost flat wiring element as wiring element 11. Specifically, a speed to extract the low resistivity 11a of a soft conductor coating bath 11b or a shape of a say to be used to extract The low resistivity 11a of a coating bath is changed to control the curvature of the circumference of the wiring element 11.

[0059] In the actual pressure adjustment process, the pressure for printing the heating block 50, the diameter of the particle 13, and the curvature of the circumference of the wiring element 11 all work together integrally, so that the width W1 of the connection zone C is adjusted to be wider than substantially half of the width W2 of the wiring element 11.

[0060] As described above, the solar cell strip 1 is manufactured.

[0061] After this, an EVA sheet (sealing element 4), a solar cell strip 1, an EVA sheet (sealing element 4), and a PET sheet (rear surface side protection element 3) are arranged sequentially layered on a glass substrate (side light receiving surface protection element 2) to form a layered body.

[0062] Then, the layer body described above is temporarily pressurized by thermosetting in a vacuum atmosphere, and then heated to a predetermined condition. In this way, the EVA is completely cured. In this way, the solar cell module 100 is manufactured.

[0063] Note that a terminal box, an Al frame, or the like can be connected to the solar cell module 100.

(Advantageous effects)

[0064] With the process for manufacturing the solar cell module 100 according to the present embodiment, the width W1 of the connection zone C in which the wiring element 11 and the connection electrode 40 are electrically connected is adjusted to be wider than substantially half the width W2 of the wiring element 11 in the thermocompression bonding process of the wiring element 11 using adhesive resin 12 which includes the particles 13 on the main surface of the solar cell 10. Accordingly, The circumference of cross section substantially perpendicular to the first direction of the wiring element 11 is convexly formed towards the connecting electrode 40.

[0065] As described above, the circumference of the wiring element 11 is convexly formed towards the connecting electrode 40. Therefore, in the thermocompression joint process, the pressure is first applied to the portion center of the second direction of the adhesive resin 12 and then gradually applied to the edge portions thereof. In other words, the edge portions of the adhesive resin 12 are heat-pressed behind its central portion.

[0066] Accordingly, the gas trapped in the adhesive resin 12 is gradually pushed out from the central portion to the edge portions. In other words, the degassing of the adhesive resin 12 is gradually carried out from the central portion to the edge portions. As described above, the degassing of the adhesive resin 12 is promoted. In this way, a mass of the residual gas can be avoided as a cavity in the adhesive resin 12 after the thermal compression bonding process.

[0067] In addition, in the thermocompression joint process, the width W1 of the connection zone C is adjusted to be wider than substantially half of the width W2 of the wiring element 11. In this way, it can be guaranteed sufficiently the electrical connection between the wiring element 11 and the solar cell 10 (connection electrode 40).

[0068] Accordingly, the collection efficiency of the solar cell 10 and the adhesion capacity of the wiring element 11 with the solar cell 10 (connection electrode 40) can be improved.

[0069] In addition, in the present embodiment, the connection zone C is formed by the various particles 13. Accordingly, the connection zone C is an area in which a distance between the soft conductor 11b and the connection electrode 40 it is substantially the same as or less than the diameter of the particle 13 in the cross section substantially perpendicular to the first direction.

[0070] Accordingly, the pressure for printing of the wiring element 11 on the solar cell 10 by the heating block 50 is set equal to or greater than the predetermined value. In this way, the width W1 of the connection zone C can be set to be wider than substantially half of the width W2 of the wiring element 11. Also, the wiring element 11 is printed on the solar cell 10 ( connection electrode 40) with a high pressure. In this way, the soft conductor 11b deforms. As a result, the width W1 of the connection zone C can be set wide.

[0071] In addition, the diameter of the particle 13 included in the adhesive resin 12 is set equal to or greater than the predetermined diameter. In this way, the width W1 of the connection zone C can be set to be wider than substantially half of the width W2 of the wiring element 11. The reason is that the connection zone C is an area where a distance between the soft conductor 11b and the solar cell 10 (connection electrode 40) is substantially equal to or less than the diameter of the particle 13. Thus, establishing the diameter of the widest particle 13, the width W1 of the Connection zone C can be set wide.

[0072] In addition, the curvature of the cross-sectional circumference substantially perpendicular to the first direction of the wiring element 11 becomes smaller. Thus, the width W1 of the connection zone C can be set wider than substantially half of the width W2 of the wiring element 11. The reason is that when the wiring element 11 is practically flat, the width of a zone in which a distance between the wiring element 11 and the solar cell 10 (connection electrode 40) is substantially equal to

or smaller than the diameter of the particle 13 can be set wide.

2. Second embodiment

[0073] A second embodiment of the present invention will be described with reference to the drawings. The present embodiment is different from the first embodiment in that a connection electrode has protruding parts of a wiring element. Therefore, parts equal to or similar to those of the first embodiment will not be omitted below.

(Configuration of a solar cell strip)

[0074] The configuration of a solar cell strip 1 according to the present embodiment will be described below with reference to Figure 7. Figure 7 is an enlarged cross-section taken along line B-B in Figure

Four.

[0075] As shown in Fig. 7, a connection electrode 40 according to the present embodiment has protruding portions 40a formed towards a wiring element 11. The protruding parts 40a are formed on each edge portion of the connection electrode 40 In a second direction. The protruding portions 40a sink into a soft conductor 11b included in the wiring element 11. It is preferred that a height of the protruding portion 40a in a third direction be substantially equal to a thickness T1 of the soft conductor 11b. This protuberant portion 40a may be formed first according to the following three approaches.

[0076] In the first approach, a distance between a frame body for fixing a screen and a photoelectric conversion part 20 is set to be wider when the connection electrode 40 is formed on the photoelectric conversion part 20 by a method of screen printing.

[0077] First, the photoelectric conversion part 20 and the frame body are set at a predetermined distance. Subsequently, a silver paste is pushed into an opening portion of the screen on the photoelectric conversion part 20. At this time, the screen is printed on the side of the photoelectric conversion part 20 by the brush and then It returns to the original position.

[0078] Here, the screen has a portion in which an opening portion of stretched wires in the form of a grid on the frame body is closed by emulsion and a portion in which emulsion is lost in a form of the connecting electrode 40 Accordingly, the silver paste rises stretched across the screen at an interface between the portion in which the emulsion is formed and the portion in which the emulsion is lost when the screen jumps up. In this way, the protruding portion 40a is formed on each edge portion of the connecting electrode 40. This protruding portion 40a can be formed higher the greater the jump of the screen, that is, as the distance between the body of frame to fix the screen and the photoelectric conversion part 20 is larger.

[0079] In the second approach, a printing speed is increased when the connection electrode 40 is formed on the photoelectric conversion part 20 by the screen printing procedure. The printing speed means a speed of movement of the brush when the silver paste is pushed to exit the opening portion of the screen on the photoelectric conversion part 20.

[0080] When the brush movement speed is increased, the screen jumps faster. When the screen jumps quickly, the silver paste is stretched across the screen at the interface between the portion in which the emulsion is formed or and the portion in which the emulsion is lost. In this way, the protruding portion 40a is formed on each edge portion of the connecting electrode 40. This protruding portion 40a can be formed higher the faster the screen skips, that is, as the printing speed is increased.

[0081] In the third approach, a viscosity of the silver paste which is a material for the connection electrode 40 is increased when the connection electrode 40 is formed on the photoelectric conversion part 20 by the screen printing procedure. As described above, the silver paste rises together with the screen at the interface between the portion in which the emulsion is formed and the portion in which the emulsion is lost. At this time, silver paste easily stretches across the screen as its viscosity increases. In other words, as the viscosity of the silver paste becomes higher, the protuberant portion 40a can be formed above.

[0082] It should be noted in the present embodiment, as shown in Figure 7, that the circumference of the wiring element 11 is convexly formed towards the connecting electrode 40. Thus, the width W1 of the area of connection C in the second direction is greater than substantially half of the width W2 of the wiring element 11.

(Advantageous effects)

[0083] In the solar cell module 100 according to the present embodiment, similar to the first embodiment, the circumference of cross section substantially perpendicular to the first direction of the wiring element 11 is convexly formed towards the connecting electrode 40 The width W1 of the connection zone C is greater than substantially half of the width W2 of the wiring element 11.

[0084] Accordingly, in the process of connecting the wiring element 11, degassing of the adhesive resin 12 can be promoted. At the same time, the wiring element 11 and the connecting electrode 40 can be electrically connected in the area of connection C.

[0085] In addition, in the solar cell module 100 according to the present embodiment, the connecting electrode 40 has the protruding portion 40a formed protruding towards the wiring element 11. The protruding portion 40a is formed at each edge portion of the electrode of connection 40 in the second direction and sinks into the wiring element 11.

[0086] As described above, the protruding portion 40a sinks into the wiring element 11. In this way, the resistance of mechanical connection between the wiring element 11 and the connecting electrode 40 and also can be improved. The electrical connection between the wiring element 11 and the connecting electrode 40 can be improved. Consequently, the pickup efficiency of the solar cell 10 and the adhesion capacity of the wiring element 11 can be further improved.

3. Third embodiment

[0087] A third embodiment of the present invention will be described below with reference to the drawings. The present embodiment is different from the first embodiment in that a solar cell according to the present embodiment does not include a connection electrode as a collection electrode. Accordingly, portions equal or similar to those of the first embodiment will not be described in the following description.

(Schematic configuration of a solar cell module)

[0088] A schematic configuration of a solar cell module 200 according to the present embodiment will be described below with reference to Figure 8. Figure 8 is an enlarged side view of the solar cell module 200 according to the present embodiment.

[0089] The solar cell module 200 is configured causing a solar cell strip 60 to be sealed with a sealing element 4 between a lateral light receiving surface protection element 2 and a rear surface lateral protection element 3.

[0090] The solar cell strip 60 includes multiple solar cells 70, wiring elements 11, and adhesive resin 72. The solar cell strip 60 is configured by connecting the multiple solar cells 70 to each other arranged in a line in a first direction by the wiring elements 11.

[0091] Adhesive resin 72 is a tape-shaped film sheet adhesive that is primarily formed by an epoxy resin. However, adhesive resin 72 does not include conductive particles.

[0092] The configurations of the other parts are similar to those of the first embodiment. (Solar cell configuration)

[0093] The configuration of solar cell 70 will be described below with reference to Figure 9. Figure 9 is a plan view of solar cell 70 on the side of the light receiving surface.

[0094] As shown in Figure 9, solar cell 70 includes a photoelectric conversion part 20 and thin-wire electrodes 30. Solar cell 70 does not include a connection electrode as a collection electrode.

[0095] The configurations of the other parts are similar to those of the first embodiment. (Configuration of the solar cell strip)

[0096] Next, the configuration of the solar cell strip 60 will be described below with reference to Figures 10 to 12. Figure 10 shows a state in which the wiring elements 11 are arranged on the solar cell 70. The Figure 11 is an enlarged cross section taken along the line DD in Figure 10. Figure 12 is an enlarged cross section taken along the line EE in Figure 10.

[0097] As shown in Figure 10, the adhesive resin 72 is provided for 2 is aligned along the first direction on the solar cell 70. In addition, the wiring element 11 is arranged in the first direction on the adhesive resin 72. a width of the wiring element 11 in the second direction is less than a width of the adhesive resin 72.

[0098] In this way, the adhesive resin 72 and the wiring element 11 are placed sequentially on the solar cell 70.

[0099] As shown in Figure 11, the wiring element 11 includes a low resistivity 11a, a soft conductor 11b, and a soft conductor 11c. a width of the wiring element 11 in the second direction is W2.

[0100] A thickness T1 of the soft conductor 11b gradually becomes smaller from the central portion of the second direction to the edge portions according to a third direction substantially vertical to the main surface of the solar cell 70. In other words, the circumference of cross section substantially perpendicular to the first direction of the wiring element 11 is formed towards the solar cell 70.

[0101] As shown in Figure 12, an upper edge portion of the thin wire electrode 30 is embedded in the soft conductor 11b. In other words, a portion of the thin cable electrode 30 is embedded in the wiring element 11. In this way, the thin cable electrode 30 and the wiring element 11 are electrically and mechanically connected to each other.

[0102] In the present embodiment, as shown in Figures 11 and 12, an area in which the thin wire electrode 30 and the soft conductor 11b are electrically connected is indicated as a connection zone

F. The connection zone F is formed by embedding the thin wire electrode portion 30 in the wiring element 11.

[0103] Here, as shown in Figure 11, the width W1 of the connection zone F in the second direction is greater than substantially half of the width W2 of the wiring element 11. (Procedure for manufacturing the module Solar cells)

[0104] Next, a process for manufacturing the solar cell module 200 according to the present embodiment will be described.

[0105] First, the photoelectric conversion part 20 similar to that described in the first embodiment is manufactured.

[0106] Subsequently, an epoxy-based heat-hardening silver paste is provided in several lines on the light receiving surface and the back surface of the photoelectric conversion part 20 along the second direction using a printing method , such as a screen printing procedure or an offset printing procedure. The silver paste is then heated under a predetermined condition to volatilize the solution, and then further heated to be completely dried. In this way, thin wire electrode 30 is formed. In this way, solar cell 70 is manufactured.

[0107] Next, the wiring element 11 is joined by thermocompression on the solar cell 70 using adhesive resin 72. In this way, the wiring element 11 and the solar cell 70 are mechanically and electrically connected. Specifically, first, the adhesive resin 72 and the wiring element 11 are provided sequentially on the light receiving surface and the back surface of the photoelectric conversion part 20. Subsequently, the wiring element 11 is pressed for approximately 15 seconds on the solar cell 70 using a heating block that is heated to approximately 180 ° C.

[0108] The electrical connection between the wiring element 11 and the solar cell 70 is formed in an area in which the portion of the thin wire electrode 30 is embedded in the wiring element 11, that is, the connection zone

F. Here, in the present embodiment, a width W1 of the connection zone F in the second direction is adjusted to be wider than substantially one half of the width W2 of the wiring element 11.

[0109] Specifically, the following two approaches can be used in order to cause the width W1 of the connection area F to be wider than substantially half the width W2 of the wiring element

eleven.

[0110] In the first approach, a pressure for printing the wiring element 11 on the solar cell 70 by the heating block 50 is set equal to or greater than a predetermined value.

[0111] In the second approach, a curvature of the circumference of the wiring element 11 in the cross section substantially perpendicular to the first direction is set as minor. In other words, the second approach uses an almost flat wiring element as wiring element 11. Specifically, a low resistivity 11a extraction speed is changed from a soft conductor coating bath 11b or a form of a sieve to be used to remove the low resistivity 11a of the coating bath to control the curvature of the circumference of the wiring element 11.

[0112] In the current contact joining process, the printing pressure of the heating block 50 and the curvature of the wiring element circumference 11 work together integrally, so that the width W1 of the connection zone F is adjusted so that it is wider than substantially half the width W2 of the wiring element 11. In this way, the solar cell strip 60 is manufactured.

[0113] After that, an EVA sheet (sealing element 4), a strip of solar cells 60, an EVA sheet (sealing element 4), and a PET sheet (protection element) are sequentially arranged in layers. rear surface side 3) on a glass substrate (protective material of the light receiving surface side 2) to form a layered body.

[0114] Then, the previously described layer body is temporarily bonded by thermocompression in a vacuum atmosphere, and then heated to a predetermined condition. In this way, the EVA is completely cured. In this way, the solar cell module 200 is manufactured.

[0115] Note that a terminal box, an Al frame, or the like can be attached to the solar cell module 200.

(Advantages and effects)

[0116] With the process for manufacturing the solar cell module 200 according to the present embodiment, the width W1 of the connection zone F in which the wiring element 11 and the thin cable electrode 30 are electrically connected is adjusted so that is wider than substantially half the width W2 of the wiring element 11 in the thermocompression joint process of the wiring element 11 using adhesive resin 72 on the main surface of the solar cell 70. The circumference of the cross-section substantially perpendicular to the first direction of the wiring element 11 is convexly formed towards the connection electrode 40.

[0117] As described above, the circumference of the wiring element 11 is convexly formed towards the connecting electrode 40. Therefore, in the thermocompression joint process, the pressure is first applied to the portion center of the adhesive resin 72 in the second direction and then gradually applied to the edge portions. Accordingly, the degassing of the adhesive resin 72 is gradually carried out from the central portion to the edge portions. As described above, the degassing of the adhesive resin 72 is promoted. In this way, a mass of residual gas in the form of a cavity in the adhesive resin 72 can be avoided after the thermal compression bonding process.

[0118] In addition, in the thermocompression joint process, the width W1 of the connection zone F is adjusted to be wider than substantially half of the width W2 of the wiring element 11. In this way, it can be guaranteed sufficiently the electrical connection between the wiring element 11 and the solar cell 70 (thin wire electrode 30).

[0119] Consequently, the capture efficiency of the solar cell 70 and the adhesion capacity of the wiring element 11 with the solar cell 70 (thin wire electrode 30) can be improved.

4. Other Accomplishments

[0120] The present invention has been described using the embodiments described above. It should be understood that the description and drawings that constitute a part of the present description are not intended to limit the present invention. In addition, various alternative embodiments, examples, operational techniques would be clear to those skilled in the art from this description.

[0121] In the embodiments described above, multiple thin wire electrodes 30 are formed on the rear surface of the photoelectric conversion part 20. However, thin wire electrodes 30 can be formed to cover their entire rear surface. The present invention does not limit the shape of the thin wire electrode 30 formed on the back surface of the photoelectric conversion part 20.

[0122] In addition, in the first embodiment, the width of the adhesive resin 12 in the second direction is adjusted to be wider than the width of the connecting electrode 40 in the second direction. However, the width of the adhesive resin 12 in the second direction may be substantially equal to or less than the width of the connection electrode 40 in the second direction.

[0123] In addition, in the second embodiment, the protuberant portion 40a is formed to be smaller in height than the thickness T1 of the soft conductor 11b. However, the height of the protuberant portion 40a can be formed to be higher than the thickness T1 of the soft conductor 11b. In other words, the protuberant portion 40a reaches the low resistivity 11a.

[0124] Also, in the third embodiment, the width of the adhesive resin 72 in the second direction is adjusted to be wider than the width of the wiring element 11 in the second direction. However, the width of the adhesive resin 72 in the second direction may be substantially equal to or less than the width of the wiring element 11 in the second direction.

[0125] As described above, the present invention obviously includes several embodiments that are not described herein. Therefore, the technical scope of the present invention is limited only by the patent claims according to their scope, which is valid from the above description.

[Examples] 10 [0126] Solar cells to be used in a solar cell module according to the present invention will be specifically described below. However, the present invention is not limited to the following examples and can be suitably modified without departing from the scope of the claims.

[0127] The first of eight examples and the first of five comparative examples are manufactured from the following table 1. [Table 1]

Welding Thickness (! M)
Nickel particle particle diameter (! M) Pressure (MPa) Connection Zone (%) Solar cell output ratio

Central portion
Edge portion

Comparative Example 1
40 10 5 0.5 twenty 91.5

Comparative Example 2
40 10 5 one 40 96.5

Example 1
40 10 5 2 fifty 99.3

Example 2
40 10 5 3 55 99.5

Example 3
40 10 10 0.5 fifty 99.5

Example 4
40 10 10 one 55 99.5

Example 5
40 10 10 2 60 99.6

Example 6
40 10 10 3 70 99.7

Comparative Example 3
40 10 2 2 40 95.3

Comparative Example 4
40 10 2 3 Four. Five 97.8

Example 7
30 10 5 one 55 99.5

Example 8
twenty 10 5 one 60 99.7

Comparative Example 5
10 10 5 one 30 93.3

(Examples) 20 [0128] First, a single crystal silicon substrate of type n with the square size of 100 mm is used to make a photoelectric conversion part.

[0129] Subsequently, an epoxy-based thermosetting silver paste is used to form a thin-wire electrode and a comb-shaped connecting electrode on a light receiving surface and a back surface of a photoelectric conversion part by a screen printing procedure. The thickness (height) and width of the connection electrode are adjusted respectively to be 50 mm and 1.5 mm. In this way, a solar cell is manufactured.

[0130] Next, a wiring element is prepared in which a SnAgCu-based weld deposited convexly or on top and bottom surfaces of a flat copper sheet with the width of 1.5 mm. Specifically, the thicknesses of the central portion and edge portions of the wiring element in one direction width are changed for each example as shown in Table 1.

[0131] The thickness of the wiring element is controlled by changing the shape of a sieve that is an element for removing a copper foil from a solder bath.

[0132] Then, an epoxy adhesive resin is applied to each of the connection electrode formed on the light receiving surface of a solar cell and the connection electrode formed on the rear surface of another solar cell adjacent to the first solar cell . The epoxy adhesive resin is one in which approximately 50,000 particles of Nickel are mixed in 1 mm3 of the epoxy zone. The particle diameter of Nickel particle is adjusted for each example as shown in table 1.

[0133] After this, the wiring element is arranged on the epoxy adhesive resin.

[0134] Next, a pressure is applied from the upper and lower sides of the wiring material using a metal head that is heated to 200 ° C, and the wiring element is heated for 60 seconds. The pressure applied by the metal head is adjusted for each example as shown in table 1.

[0135] In this way, solar cells are manufactured according to the first to eighth examples.

(Comparative examples)

[0136] The solar cell strips according to the first to fifth comparative examples of the present invention have been manufactured from Table 1. The procedures for manufacturing the comparative examples are different from the procedure for manufacturing the examples in adjustments of the thicknesses of the central portion and edge portions of the wiring element in the width direction, the diameters of the Nickel particles, and the pressures applied by the metal head.

[0137] The other processes are similar to those of the examples described above.

(Output power measurements)

[0138] With reference to Table 1, the output powers of solar cells according to the first to eighth examples and the first to fifth comparative examples will be examined below. Their output powers were measured before and after thermocompression bonding of the wiring element.

[0139] In Table 1, a power output ratio means a relative value of solar cell output power after thermocompression junction of the wiring element in relation to the solar cell output power before joint by thermocompression of the wiring element.

[0140] Furthermore, with respect to each of the first to eighth examples and the first to fifth comparative examples, a width of a connection zone is measured in which the wiring element and the connection electrode are electrically connected. Here, the connection zone means an area in which a distance between welding and connection electrode is equal to or less than the diameter of the Nickel particle. In table 1, the width of the connection zone in relation to the width of the wiring element in the second direction is shown by a relative value.

[0141] From the results of the first and second comparative examples and the first and second examples, it is confirmed that the connection zone can be increased causing the contact junction pressure of the wiring element to be higher. In addition, it is observed that the deterioration of the output power of the solar cell can be suppressed since it is the largest connection zone. This result shows an achievement of lower contact resistance between the wiring element and the connection electrode as the connection zone increases.

[0142] Similarly, it is also observed from the results of the third to sixth examples that the deterioration of solar cell power can be suppressed by increasing the connection zone by increasing the contact pressure of wiring element union.

[0143] Furthermore, when comparing the results of the first and second examples, the third to sixth examples, and the third and fourth comparative examples, it is observed that the deterioration of the solar cell power can be suppressed when the diameter is increased of the nickel particles. This is because the connection zone is an area in which a distance between the weld and the connection electrode is equal to or less than the diameter of the Nickel particle. It should be noted that the connection zone is formed by the Nickel particles in the epoxy resin adhesive.

[0144] When comparing the results of the second comparative example and the results of the seventh and eighth examples, it is observed that the connection zone can be increased by a smaller difference in thickness between the central part and the edge portions of the welding. This is because the width of the connection zone formed by the nickel particle can be increased by becoming the almost flat wiring element.

[0145] In contrast, from the result of the fifth comparative example, when the wiring element is formed flat, it is observed that the connection zone decreases greatly. As a result, the power of the solar cell is extremely reduced by the thermocompression junction of the wiring element. This is because the degassing of the epoxy adhesive resin cannot be promoted due to the flat formation of the wiring element. In this way, the mass of the gas in the epoxy adhesive resin becomes residual as a cavity. In other words, in the first to eighth examples, degassing of the epoxy adhesive resin is promoted.

Claims (6)

  1.  CLAIMS
    1. Solar cell module comprising first and second solar cells arranged in a line in a first direction and a wiring element that electrically connects the first and second solar cells, in which
    the first and second solar cells each include a photoelectric conversion part configured to produce photogenerated carriers upon receiving light and a collection electrode that is formed on a main surface of the photoelectric conversion part and that is configured to collect the photogenerated carriers, the wiring element is provided in the first direction on the main surfaces of the first and second solar cells, an adhesive resin is provided between the wiring element and the main surfaces of the first and second solar cells in which said adhesive resin can contain a plurality of conductive particles,
     characterized by the fact that:
    a circumference of a cross section of the wiring element is convexly formed towards the first and second solar cells, the cross section being perpendicular to the first direction, and in a second direction perpendicular to the first direction, a width of a zone of connection (W1) in which the wiring element and the pick-up electrode are electrically connected is greater than one half of a width (W2) of the wiring element that can be printed under high pressure; wherein when the adhesive resin includes a plurality of conductive particles, the connection zone is an area in which a distance between the wiring element and the collection electrode is the same as or less than that of the diameter of the conductive particles in the cross section perpendicular to the first direction and when the adhesive resin does not include a plurality of conductive particles, the connection zone is an area formed by embedding a portion of a thin wire electrode (30) in the wiring element.
  2. 2.
    The solar cell module according to claim 1, wherein the thin cable electrodes are configured to collect the photogenerated carriers from the photoelectric conversion part and there is a connection electrode configured to collect the photogenerated carriers of the thin cable electrodes, The connection electrode is formed in the first direction, the wiring element is provided on the connection electrode, the adhesive resin includes a plurality of conductive particles, and the connection zone is formed by the particles included in the adhesive resin.
  3. 3.
    The solar cell module according to claim 2, wherein the connecting electrode has a convex protruding portion formed towards the wiring element, the protruding portion is formed on an edge portion of the connecting electrode in the second direction, and the protruding portion sinks into the wiring element.
  4. Four.
    Procedure for manufacturing a solar cell module that includes first and second solar cells arranged in a line in a first direction and a wiring element that electrically connects the first and second solar cells, whose wiring element can be printed under high pressure the procedure comprising the steps of:
    (TO)
     manufacturing the first and second solar cells forming a collection electrode configured to collect photogenerated carriers on a main surface of a photoelectric conversion part configured to produce the photogenerated carriers upon receiving light; Y
    (B)
     thermocompressively joining the wiring element on main surfaces of the first and second solar cells in the first direction with an adhesive resin, adhesive resin that can contain a plurality of conductive particles in which in the stage of (B), a circumference of a cross section of the wiring element is convexly formed towards the first and second solar cells, the cross section being substantially perpendicular to the first direction, and a width of a connection zone in which the wiring element and the electrode of connection are electrically connected is established wider than one half of a width of the wiring element, in a second direction perpendicular to the first direction; wherein when the adhesive resin includes a plurality of conductive particles, the connection zone is an area in which a distance between the wiring element and the collection electrode is the same as or less than that of the diameter of the conductive particles in the cross section perpendicular to the first direction and when the adhesive resin does not include a plurality of conductive particles, the connection zone is an area formed by embedding a portion of a thin wire electrode (30) in the wiring element.
  5. 5.
    Process for manufacturing a solar cell module according to claim 4, wherein the adhesive resin includes a plurality of conductive particles, and in the step of (B), the width of the connection zone is
    sets wider than one half of a width of the wiring element by establishing a diameter of each of the plurality of conductive particles included in the adhesive resin to a predetermined or greater diameter.
  6. 6.
    The method for manufacturing a solar cell module according to claim 4, wherein, in the step of (B), the width of the connection zone is established wider than one half of a width of the wiring element by establishing a pressure to thermocompressively join the wiring element on the main surfaces of the first and second solar cells at a predetermined or greater pressure.
     FIRST ADDRESS  
     FIRST DIRECTION
    SECOND ADDRESS THIRD ADDRESS
    SECOND ADDRESS
     SECOND ADDRESS  
     THIRD ADDRESS
    SECOND ADDRESS
    SUNLIGHT
     SECOND ADDRESS  
    FIRST ADDRESS
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