JP2005191125A - Connection tab for connecting solar battery element and solar battery module, and method of manufacturing solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate cracking and chipping of solar battery elements at the time of lamination thereof by an easy method having no bad influence on quality such as bubbles remaining inside. <P>SOLUTION: A belt-like connection tab for connecting solar battery elements is such that a metal foil is coated with solder, and is installed to connect a light receiving-side electrode of one of two adjacent solar battery elements and a rear face-side electrode of the other one by soldering. In part of the connection tab which does not overlap the solar battery elements, bending portions, each being bent 3-20 times, are formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connection tab for connecting solar cell elements, and more particularly to a connection tab for connecting solar cell elements that prevents cracks, cracks and cracks of the solar cell elements during solar cell module production. The present invention relates to a solar cell module in which a plurality of solar cell elements are electrically connected using a connection tab and a method for manufacturing the solar cell module.

  Solar cell elements are often manufactured using a single crystal silicon substrate or a polycrystalline silicon substrate. For this reason, a solar cell element is weak to a physical impact, and when a solar cell element is attached outdoors, it is necessary to protect this from rain. Further, since one solar cell element has a small electrical output, it is necessary to use a plurality of solar cell elements that are electrically connected in series or in parallel.

  For this reason, a well-conductive wiring material is cut into an appropriate length (hereinafter, this wiring material is cut into an appropriate length is called a connection tab for connecting solar cell elements). The solar cell elements are connected in series and parallel, and the connected solar cell elements are sealed with a filler mainly composed of ethylene vinyl acetate copolymer (EVA) between the translucent substrate and the back sheet, It is usual to create a solar cell module.

  Encapsulating these connected solar cell elements by heating and pressurizing with a filler under reduced pressure is called laminating.

  FIG. 4 is a view showing a state of lamination of a conventional solar cell module.

  In FIG. 4, 1 is a translucent substrate, 2 is a light receiving surface side filler, 3a and 3b are solar cell elements, 4 is a back surface side filler, 5 is a back sheet, 6 is a connection tab for connecting solar cell elements, and 7 is The direction of pressing during laminating, 8 and 9 indicate the portions where the connection tabs for connecting solar cell elements and the end portions of the solar cell elements contact.

  The translucent substrate 1 is often made of tempered plate glass. The light receiving surface side filler 2 and the back surface side filler 4 are often made of EVA or the like. The solar cell elements 3a and 3b are often manufactured using a single crystal silicon substrate or a polycrystalline silicon substrate as described above. As the back sheet 5, a sheet made of a fluorine resin or the like having weather resistance in which an aluminum foil is sandwiched so as not to transmit moisture is often used. The connection tab 6 for connecting the solar cell elements is usually used by cutting a wiring material such as a copper foil coated with solder to a predetermined length.

  In the laminating step, the above-described translucent substrate 1, light receiving surface side filler 2, solar cell elements 3a and 3b, back surface side filler 4 and back sheet 5 connected by the solar cell element connection tab 6 are placed in the laminator. And heat and pressurize under reduced pressure. As a result, the light-receiving surface side filler 2 and the back surface side filler 4 are melted and bonded to integrate these members.

  In this laminating step, since the light receiving surface side filler 2 and the back surface side filler 4 are melted and pressed in the direction of the arrow 7, the solar cell elements 3 a and 3 b sink in the direction of the translucent substrate 1. Moving. Since this movement becomes non-uniform depending on the pressing state at the time of lamination, a force is applied to the end portions 8 and 9 of the solar cell elements 3a and 3b and the connection tabs 6 for connecting the solar cell elements, and the solar cell elements 3a and 3b. Cracks, cracks, and cracks may occur in this part. For example, considering the case where the moving amount of the solar cell element 3a is larger than the solar cell element 3b, the distance between the solar cell element 3a and the solar cell element 3b extends obliquely downward. For this reason, the solar cell element connection tab 6 also extends. The force for extending the solar cell element connection tab 6 is applied to the end portions 8 and 9 of the solar cell elements 3a and 3b and the solar cell element connection tab 6 in contact with each other. Cracks, cracks and cracks occur in this part.

  As a countermeasure against cracks, cracks and cracks in the solar cell elements 3a and 3b at the time of such lamination, the portions corresponding to the solar cell element connection tabs 6 of the light receiving surface side filler 2 and the back surface side filler 4 are previously removed. Thus, a solar cell module manufacturing method has been devised so that pressure is not directly applied to this portion (see Patent Document 1).

Prior art document information related to the invention of this application includes the following.
Japanese Patent Laid-Open No. 11-312820

  However, in the method in which the portions corresponding to the solar cell element connection tab 6 of the light receiving surface side filler 2 and the back surface side filler 4 as described above are removed in advance, the filler does not go around the removed portion, and bubbles are not formed in the portions. May remain, which may impair the appearance of the solar cell module or reduce its reliability.

  Further, depending on the size of the solar cell element used in addition to the size of the standard solar cell module, the number of solar cell elements to be connected, etc., there are many types of light receiving surface side filler 2 and back surface side filler 4 corresponding to each type. There was a problem that it was necessary to prepare.

  The present invention has been made in view of such problems, and the object thereof is a method that is simple and does not affect the quality, such as bubbles remaining inside, and is a solar cell element at the time of lamination described above. It is to eliminate cracks, cracks and cracks.

  The connection tab for connecting solar cell elements of the present invention is a metal provided to connect the light receiving surface side electrode of one of the adjacent two solar cell elements and the other back surface side electrode by soldering. A strip-shaped connection tab for connecting solar cell elements, which is formed by coating a solder on a foil, wherein a bent portion having a number of bending times of 3 times or more and 20 times or less is provided in a portion of the metal foil that does not overlap with the solar cell elements. It is characterized by that.

  Moreover, the connection tab for other solar cell element connection of this invention is provided in the metal foil provided in order to connect the light-receiving surface side electrodes or back surface side electrodes of two adjacent solar cell elements by soldering. A connection tab for connecting a solar cell element in the form of a solder covering, wherein a bent portion having a folding number of 3 times or more and 20 times or less is provided in a portion of the metal foil that does not overlap the solar cell element. Features.

  Moreover, the solar cell module of the present invention is characterized in that a plurality of solar cell elements are electrically connected using the connection tab for connecting solar cell elements according to claim 1 or 2.

  Moreover, the manufacturing method of the solar cell module of this invention is the manufacturing of the solar cell module characterized by integrating by heating-pressing under pressure reduction, after passing through each process of following (1)-(4) sequentially. Method.

  (1) A light receiving surface side filler is disposed on a translucent substrate.

  (2) A plurality of solar cell elements electrically connected by the connection tab for connecting solar cell elements according to claim 1 or 2 are arranged on the light receiving surface side filler.

  (3) A back surface side filler is disposed on the solar cell element group.

  (4) A back sheet is disposed on the back side filler.

  According to the connection tab for connecting solar cell elements of the present invention, it is provided for connecting the light receiving surface side electrode of one of the adjacent two solar cell elements and the other back surface side electrode by soldering. A strip-shaped connection tab for connecting solar cells to a metal foil, wherein the metal foil is provided with a bent portion having a number of bendings of not less than 3 times and not more than 20 times in a portion not overlapping with the solar cell elements. By providing, when a plurality of solar cell elements are electrically connected in series, the portion between the solar cell elements of the connection tab for connecting solar cell elements can be expanded and contracted, and the pressure during lamination Even when the solar cell element moves so as to sink in the direction of the translucent substrate, the shape of the connection tab for connecting the solar cell element can be changed according to the movement of the solar cell element. It becomes way, the force that is applied eliminated portion contacting the connection tabs for a solar cell element end and the solar cell element connection. Thereby, cracks, chips and cracks of the solar cell element can be eliminated.

  Moreover, according to the connection tab for connecting other solar cell elements of the present invention, the metal provided for connecting the light receiving surface side electrodes or the back surface side electrodes of two adjacent solar cell elements by soldering. A strip-shaped connection tab for connecting solar cell elements, which is obtained by coating solder on a foil, wherein a bent portion having a number of bendings of 3 to 20 times is provided in a portion of the metal foil that does not overlap with the solar cell element Thus, when a plurality of solar cell elements are electrically connected in parallel, the portion between the solar cell element and the solar cell element of the connection tab for connecting the solar cell elements can be expanded and contracted, and the pressing state at the time of lamination Thus, even when the solar cell element moves so as to sink in the direction of the translucent substrate, the shape of the connection tab for connecting the solar cell element can be changed according to the movement of the solar cell element. Uninari, part force is applied it is no longer in contact with the connecting tab for solar cell element end and the solar cell element connection. Thereby, cracks, chips and cracks of the solar cell element can be eliminated.

  Moreover, according to the solar cell module of the present invention, a plurality of solar cell elements are electrically connected using the connection tab for connecting solar cell elements according to claim 1 or 2, so that the end of the solar cell element is connected. Cracks, chips, and cracks are eliminated, and a more reliable solar cell module can be obtained.

  Furthermore, according to the method for manufacturing a solar cell module of the present invention, the solar cell element of the connection tab for connecting the solar cell elements is operated even when the force for moving the solar cell element downward by the pressing during lamination works as described above. Depending on the movement of the solar cell element, even if the solar cell element moves so as to sink in the direction of the translucent substrate due to the pressing state at the time of lamination Thus, the shape of the solar cell element connection tab can be changed, and no force is applied to the portion where the solar cell element connection tab and the solar cell element connection tab are in contact with each other. As a result, cracking, chipping, and cracking of the solar cell element can be eliminated, and not only the production yield of the solar cell module can be increased, but also a more reliable solar cell module can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a view showing a connection tab for connecting solar cell elements according to the present invention.

  In FIG. 1, 11 is a connection tab for connecting solar cell elements, 12a and 12b are portions overlapping the solar cell elements of the connection tab for connecting solar cell elements, and 13 is a bent portion of the connection tab for connecting solar cell elements.

  Furthermore, FIG. 2 shows a state in which two solar cell elements are connected in series using the connection tab for connecting solar cell elements according to the present invention.

  In FIG. 2, as in FIG. 1, 11 is a connection tab for connecting solar cell elements, 12 a and 12 b are portions of the connection tab for connecting solar cell elements that overlap the solar cell elements, and 13 is a bent portion of the connection tab for connecting solar cell elements. 14a and 14b are solar cell elements, 15 is a light-receiving-surface-side busbar electrode of the solar cell element, 16 is a finger electrode, and 33 is a portion that does not overlap with the solar cell element of the connection tab for connecting solar cell elements.

  The connection tab 11 for connecting the solar cell elements is made of a highly conductive metal such as silver, copper, aluminum, or iron, but is made of copper in consideration of its conductivity and ease of solder coating. Is preferable. The thickness is about 0.1 to 0.3 mm, and the width of the bus bar is such that the solar cell element connection tab 11 itself does not shadow the light receiving surfaces of the solar cell elements 14a and 14b when soldering. The width is equal to or less than the width of the electrode 15. Furthermore, the length of the solar cell element connection tab 11 overlaps almost all of the bus bar electrodes 15, and further from 20 to the non-light-receiving surface bus bar electrode (not shown) of the solar cell elements adjacent to the predetermined gap between the solar cell elements. Overlap about 110 mm. When a general 150 mm square polycrystalline silicon solar cell element is used, the width of the solar cell element connection tab is about 1 to 3 mm, and the length is about 150 to 250 mm. The reason why the connection tab 11 for connecting the solar cell elements overlaps almost all of the light receiving surface side bus bar electrode 15 is to reduce the resistance component of the solar cell elements.

  Moreover, the connection tab 11 for connecting solar cell elements according to the present invention is provided with a bent portion 13 having a number of bendings of not less than 3 times and not more than 20 times in a portion not overlapping with the solar cell elements in a state before being connected to the solar cell elements. It is provided. The bent portion 13 may be provided on the entire portion 33 of the solar cell element connection tab 11 that does not overlap the solar cell element, but the portion 33 of the solar cell element connection tab 11 that does not overlap the solar cell element. You may provide said bending part in some.

  The length of one side of the bent portion 13 is preferably about 0.5 to 2 mm and the number of times of bending is preferably about 3 to 20 times. If the length of one side being bent is smaller than 0.5 mm, the range where the expansion and contraction can be performed is limited, and the effect is insufficient. If the length is larger than 2 mm, this portion may be forcibly opened by the pressing during lamination. And the alignment of solar cell elements may be disturbed. Further, if the number of bendings is less than 3, the range in which the expansion and contraction can be performed is limited, and the effect becomes insufficient. If the number exceeds 20 times, the distance between the solar cell element and the solar cell element becomes longer than necessary. The size of the battery module increases, and the power generation efficiency of the solar cell module decreases.

  Such a connection tab 11 is simple and inexpensive to manufacture by forming a mold provided with an uneven portion that fits the bent portion 13, placing a wiring material on the mold, and pressing it.

  The solar cell element connection tab 11 is thus provided with a bent portion having a number of bendings of 3 times or more and 20 times or less in a portion that does not overlap the solar cell element. The portion between the solar cell element and the solar cell element can be expanded and contracted, and even when the solar cell element moves so as to sink in the direction of the translucent substrate due to the pressing state during lamination, the solar cell element The shape of the solar cell element connection tab can be changed according to the movement, and no force is applied to the portion where the solar cell element end and the solar cell element connection tab are in contact. Thereby, cracks, chips and cracks of the solar cell element can be eliminated.

  The solar cell elements 14a and 14b are made of single crystal silicon or polycrystalline silicon having a thickness of about 0.3 to 0.4 mm and a size of about 150 mm square, for example. Inside the solar cell elements 14a and 14b, a PN junction is formed in which a P layer containing a large amount of P-type impurities such as boron and an N layer containing a large amount of N-type impurities such as phosphorus are in contact. The bus bar electrode 15 and the finger electrode 16 are formed of silver paste by a screen printing method or the like, and the surface of the bus bar electrode 15 is soldered over almost the entire surface in order to easily protect it and attach a connection tab for connecting a solar cell element. Coated. The finger electrodes 16 have a width of about 0.1 to 0.2 mm, and a large number of finger electrodes 16 are formed in parallel with the sides of the solar cell element to collect photogenerated carriers. The bus bar electrodes 15 are formed to collect the collected carriers and have a width of about 2 mm for attaching the connection tabs for connecting the solar cell elements, and about two bus bar electrodes 15 are formed so as to intersect the finger electrodes 16 perpendicularly. Such bus bar electrodes 15 and finger electrodes 16 are similarly formed on the back surfaces (non-light-receiving surfaces) of the solar cell elements 14a and 14b.

  A method of connecting the bus bar electrodes 15 of the solar cell elements 14a and 14b and the solar cell element connecting connection tab 11 in series by soldering is as follows.

  First, the solar cell element connection tab 12b is disposed on the bus bar electrode 15 of the solar cell element 14a. Solder of both the bus bar electrode 13 of the solar cell element 14a and the connection tab 12a for solar cell element connection by blowing hot air or pressing a soldering iron while pressing the connection tab 12b for solar cell element with a pressing pin. Melt and connect. Further, the other end of the solar cell element connection tab 11 is disposed on the bus bar electrode (not shown) on the back surface side of the other solar cell element 14b, and the solder is similarly melted and connected. In this case, the space between the solar cell elements 14a and 14b is preferably about 1 to 5 mm in order to prevent cracking, chipping, and cracking during lamination in the connection tab for connecting solar cell elements provided with bent portions.

  Furthermore, the solar cell element connection tab 11 according to the present invention may be preliminarily soldered about 20 to 70 microns on one side by dipping or the like before being connected to the solar cell element. In order not to impair the ease of expansion and contraction of the portion 13, the solar cell element (not shown) adjacent to the portion 12b of the solar cell element connection tab 11 connected to the light receiving surface side bus bar electrode 15 of the solar cell element 14a. By separately dipping the portion 12a connected to the non-light-receiving surface bus bar electrode, a preliminary solder of about 20 to 70 microns on one side is previously coated on the portion, and all or a part between the solar cell elements is applied to the portion. A portion that is not pre-soldered may be provided.

  Thus, by providing a part that is not pre-soldered in all or a part between the solar cell elements, the flexibility between the solar cell element and the solar cell element of the connection tab for connecting the solar cell elements is increased, and the laminate is laminated. Even when the solar cell element moves so as to sink in the direction of the translucent substrate, the shape of the connection tab for connecting the solar cell element is changed according to the movement of the solar cell element depending on the state of pressing at the time. Thus, the effect of eliminating the application of force to the contact portion between the solar cell element end and the solar cell element connection tab can be further enhanced. Thereby, cracks, chips and cracks of the solar cell element can be eliminated.

  In addition, in FIG. 2, although demonstrated in the case of the serial connection which connects the light-receiving surface side electrode of the solar cell element 14b, and the back surface side electrode of the solar cell element 14a, the light-receiving surface side electrodes of the adjacent solar cell element are mutually demonstrated. Or, it goes without saying that the same effect can be obtained even in the case of parallel connection in which the backside electrodes are connected to each other.

  (A) of FIG. 5 shows one Example when the solar cell element adjacent to the connection tab for solar cell element connection concerning this invention is connected in series, (b) is the connection tab for solar cell element connection concerning this invention FIG. 6 (a) shows another embodiment when the adjacent solar cell elements of the connection tab for connecting solar cell elements according to the present invention are arranged in series. (B) shows the other Example when the solar cell element which the connection tab for solar cell element connection which concerns on this invention adjoins is arranged in parallel.

  In FIG. 5 (a), it is an example showing a schematic diagram when two adjacent solar cell elements are electrically connected in series using a connection tab for connecting solar cell elements in which the number of bending of the bent portion is three. is there. The connection tab for connecting solar cell elements is connected to the light receiving surface side electrode of one solar cell element and to the back surface side electrode of the other solar cell element.

  In FIG.5 (b), it is an example which shows the model when two adjacent solar cell elements are electrically connected in parallel using the connection tab for solar cell element connection which the bending frequency | count of a bending part has 3 times. is there. The connection tab for connecting solar cell elements is connected to the light receiving surface side electrode of one solar cell element and is also connected to the light receiving surface side electrode of the other solar cell element.

  FIG. 6A is an example showing a schematic diagram when a connection tab for connecting solar cell elements having a folding portion of 4 is used and two adjacent solar cell elements are electrically connected in series. is there. The connection tab for connecting solar cell elements is connected to the light receiving surface side electrode of one solar cell element and to the back surface side electrode of the other solar cell element.

  FIG. 6B is an example showing a schematic diagram when a connection tab for connecting solar cell elements in which the number of bending of the bent portion is 4 and two adjacent solar cell elements are electrically connected in parallel. is there. The connection tab for connecting solar cell elements is connected to the light receiving surface side electrode of one solar cell element and is also connected to the light receiving surface side electrode of the other solar cell element.

  In addition, as a method for producing a solar cell module using the connection tab for connecting solar cell elements of the present invention, the following steps (1) to (4) were sequentially performed, and then integrated by heating and pressing under reduced pressure. It is characterized by that.

  (1) A light receiving surface side filler is disposed on a translucent substrate.

  (2) A plurality of solar cell elements electrically connected by the connection tab for connecting solar cell elements according to claim 1 are arranged on the light receiving surface side filler.

  (3) A back surface side filler is disposed on the solar cell element group.

  (4) A back sheet is disposed on the back side filler.

  FIG. 3 is a view showing an example of the structure of a solar cell module using the connection tab for connecting solar cell elements according to the present invention.

  In this figure, 21 is a translucent substrate, 22 is a light receiving surface side sealing material, 23 is a solar cell element, 24 is a back surface side sealing material, 25 is a back surface sheet, 26 is a connection tab for connecting solar cell elements, 27 Is an output wiring, and 28 is a terminal box.

  Hereinafter, each member will be described in detail.

  As the translucent substrate 21, a substrate made of glass, polycarbonate resin, or the like is used.

  As the glass plate, white plate glass, tempered glass, double tempered glass, heat ray reflective glass and the like are used, but generally white plate tempered glass having a thickness of about 3 mm to 5 mm is used.

  On the other hand, when a substrate made of a synthetic resin such as polycarbonate resin is used, a substrate having a thickness of about 5 mm is often used.

  The light-receiving surface side sealing material 22 and the back surface side sealing material 24 are made of an ethylene-vinyl acetate copolymer (hereinafter, ethylene-vinyl acetate copolymer is abbreviated as EVA), and have a thickness of about 0.4 to 1 mm. A sheet-like form is used. These are fused and integrated with other members by heating and pressing under reduced pressure with a laminating apparatus.

  EVA may contain titanium oxide, a pigment, etc., and may be colored white. In the light-receiving surface side sealing material 22 according to the present invention, when colored, the amount of light incident on the solar cell element 23 tends to decrease and the power generation efficiency tends to decrease.

  Moreover, although EVA used for the back surface side sealing material 24 is preferably composed of a transparent material, in addition to this, titanium oxide, pigment, or the like is contained in accordance with the installation environment around the solar cell module, thereby coloring it to white or the like. May be.

  As described above, the solar cell element 23 is made of single crystal silicon or a polycrystalline silicon substrate having a thickness of about 0.3 to 0.4 mm.

  The connection tab 26 for connecting the solar cell elements has the structure described in detail above.

  The output wiring 27 transmits the electrical output generated by the solar cell element 23 to the terminal box 28. Usually, the entire surface of a copper foil having a thickness of about 0.1 mm and a width of about 2 mm is solder-coated. Cut into length, one end of which is soldered to the connection tab 26 for connecting solar cell elements, and the other end is soldered to a terminal in the terminal box.

  As the back sheet 25, a fluorine-based resin sheet having weather resistance in which an aluminum foil is sandwiched so as not to transmit moisture, a polyethylene terephthalate (PET) sheet on which alumina or silica is deposited, and the like are used.

  In addition, a slit is provided at a predetermined position of the back sheet 25, and the output wiring 27 is drawn out from the slit to the surface of the back material in advance using tweezers before lamination.

  First, the above-described translucent substrate 21, light-receiving surface side sealing material 22, solar cell element connection tab 26 and solar cell element 23 connected to the output wiring 27, back surface side sealing material 24, and back surface material 25 are superimposed. They are set in a device called a laminator and integrated by applying pressure while heating at a temperature of about 100 to 200 ° C. for about 15 to 60 minutes under a reduced pressure of about 50 to 150 Pa.

  Thereafter, the terminal box 28 is attached to the back side of the integrated solar cell panel.

  The terminal box 28 is provided to connect the electrical output from the solar cell element 23 to an external circuit. For example, a modified polyphenylene ether resin (modified PPE resin) or the like is used to consider the light resistance against ultraviolet rays or the like, and the terminal box 28 is usually black. Built.

  The terminal box according to the present invention is attached to a predetermined position on the back surface side of the solar cell panel using an adhesive or the like.

  In addition, the terminal box 28 according to the present invention is divided into a main body portion and a lid portion so as to facilitate the soldering operation after the attachment, and the lid portion is fixed to the main body portion by fitting or screwing.

  The size of the terminal box 28 according to the present invention may be determined optimally depending on the size of the solar cell module to be attached. As an example, the size of one side is about 5 to 15 cm and the thickness is about 1 to 5 cm.

  Next, a module frame (not shown) is attached to the four sides of the integrated solar cell panel. This module frame is often made of aluminum or resin in consideration of the strength and cost required for the solar cell panel. When it is made of aluminum, it is often made by extruding aluminum, and its surface is often subjected to alumite treatment or clear coating. After such a module frame is attached to each side of the solar cell panel portion, each corner portion of the module frame is screwed to complete the solar cell module.

  In addition, this invention is not limited to the said embodiment, Many corrections and changes can be added within the scope of the present invention. For example, the solar cell element is not limited to a crystalline solar cell such as a single crystal or polycrystalline silicon, and can be applied to a thin film solar cell.

It is a figure which shows the connection tab for solar cell element connection which concerns on this invention. The state which connected two solar cell elements in series using the connection tab for solar cell element connection which concerns on this invention is shown. It is a figure which shows an example of the structure of the solar cell module which uses the connection tab for solar cell element connection which concerns on this invention. It is a figure which shows the mode of the lamination of the conventional solar cell module. (A) An Example when the solar cell element which the connection tab for solar cell element connection which concerns on this invention adjoins is connected in series is shown.

(B) One Example when the solar cell element which the connection tab for solar cell element connection which concerns on this invention adjoins is paralleled is shown.
(A) The other Example when the solar cell element which the connection tab for solar cell element connection which concerns on this invention adjoins is serially shown.

  (B) The other Example when the solar cell element which the connection tab for solar cell element connection concerning this invention adjoins is paralleled is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2: 1: Translucent board | substrate 2, 22: Light-receiving surface side filler 3a, 3b, 14a, 14b, 23: Solar cell element 4, 24: Back surface side filler 5, 25: Back surface sheet 6, 11, 26: Solar cell element connection tab 7: direction of pressing during lamination 8, 9: portions 12a, 12b where the connection tab contacts the end of the solar cell element: portions 13 overlapping the solar cell element of the solar cell element connection tab 13 : Bent portion 15 of connection tab for connecting solar cell element 15: bus bar electrode 16: finger electrode 27: output wiring 28: terminal box 33: portion not overlapping with solar cell element of connection tab for connecting solar cell element

Claims (4)

A strip-shaped solar cell formed by coating a metal foil with solder, which is provided to connect the light-receiving surface side electrode and the other back surface side electrode of one solar cell element of two adjacent solar cell elements by soldering A connection tab for connecting a solar cell element, wherein a bent portion having a number of bendings of 3 to 20 times is provided in a portion of the metal foil that does not overlap the solar cell element . It is a strip-shaped connection tab for connecting solar cell elements, which is provided to solder the light receiving surface side electrodes or the back side electrodes of two adjacent solar cell elements to each other by soldering. A connection tab for connecting solar cell elements, wherein a bent portion having a number of bendings of 3 to 20 times is provided in a portion of the metal foil that does not overlap the solar cell element. A solar cell module, wherein a plurality of solar cell elements are electrically connected using the connection tab for connecting solar cell elements according to claim 1. A method for producing a solar cell module, comprising sequentially following the steps (1) to (4), and then integrated by heating and pressing under reduced pressure.
(1) A light-receiving surface side filler is disposed on a translucent substrate.
(2) A plurality of solar cell elements electrically connected by the connection tab for connecting solar cell elements according to claim 1 or 2 are arranged on the light receiving surface side filler.
(3) A back side filler is disposed on the solar cell element group.
(4) A back sheet is disposed on the back side filler.

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