JP2008235819A - Solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell module for improving productivity by suppressing warpage of a cell substrate. <P>SOLUTION: The solar cell module has a first solar cell C<SB>11</SB>where not less than two busbar electrodes 21a, 21b with an X direction as a longitudinal direction are arranged on a main surface; a second solar cell adjacent to a Y direction nearly orthogonally crossing an X direction of the first solar cell C<SB>11</SB>, while not less than two busbar electrodes with the X direction as a longitudinal direction are arranged on a main surface; a first connection member 12 for electrically connecting the first solar cell C<SB>11</SB>and a second solar cell; and not less than two second connection members 13a, 13b for electrically connecting not less than two busbar electrodes 21a, 21b and the first connection member 12. Not less than two second connection members 13a, 13b are bonded to the busbar electrodes 21a, 21b and the first connection member 12 so that the difference in the amount of thermal shrinkage between the first solar cell C<SB>11</SB>and the first connection member 12 is absorbed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a semiconductor device that is sensitive to infrared rays, visible light, and short-wave electromagnetic waves, and more particularly to a solar cell module that converts these radiation energy into electrical energy.

  Solar cells are attracting attention as a new environmentally friendly energy source because they can directly convert light from the sun, a clean and inexhaustible energy source, into electricity.

  When such a solar battery is used as a power source (energy source), the output per solar battery cell is about several watts at most, so it is not used for each solar battery cell, but as shown below. In general, it is used as a solar cell module in which a plurality of solar cells are arranged in a matrix and these are electrically connected in series to increase the output to 100 W or more (for example, see Patent Document 1). ).

  First, a predetermined number of solar cells are arranged along a straight line, and a plurality of strings are formed in which these are electrically connected in series with tab wiring extending in the direction of the straight line. Then, a plurality of strings are arranged in the short direction substantially perpendicular to the straight line, and the tab wirings on the solar cells located at the ends of the adjacent strings are electrically connected by a connecting member extending in the short direction. . As described above, a plurality of solar cells arranged in a matrix can be connected in series.

Further, the applicant arranges the electrodes of different polarities of the solar cells located at the ends of the adjacent strings so as to face in the same direction, and the connecting member is arranged on the main surface of the solar cells. There has been proposed a solar cell module that is bonded to a bus bar electrode on the back side of a solar cell located at an end (Japanese Patent Application No. 2006-99978).
JP 2006-278904 A

  However, since usually two or more bus bar electrodes are formed in the solar battery cell, the connecting member is bonded to two or more bus bar electrodes for one solar battery cell. Therefore, due to the difference in thermal expansion coefficient between the connecting member and the cell substrate, the warping of the cell substrate may occur when the connecting member is bonded, and the cell substrate may be cracked after the laminating process, which increases the productivity of the solar cell module. It will decline.

  The objective of this invention is providing the solar cell module which suppressed the curvature of the cell substrate and improved productivity.

  A feature of the present invention is that a first solar cell in which two or more bus bar electrodes having a first direction as a longitudinal direction are arranged on a main surface, and two or more bus bar electrodes having a first direction as a longitudinal direction. Is disposed on the main surface, and is adjacent to the first solar cell in a second direction substantially orthogonal to the first direction, the first solar cell, and the first solar cell. A first connecting member that electrically connects the two solar cells, and two or more bus bar electrodes disposed on the main surface of the first solar cell and the first connecting member. Two or more second connection members that are connected to each other, wherein the two or more second connection members are respectively thermally expanded and contracted between the first solar cell and the first connection member. By adhering to the bus bar electrode and the first connecting member so as to absorb the difference in quantity That.

  In the feature of the present invention, the first connecting member is disposed at a position overlapping the first solar battery cell, and the second connecting member is bonded to the bus bar electrode at a position not overlapping the first connecting member. It is desirable that

  In the feature of the present invention, it is desirable that the bonding portion between the bus bar electrode and the second connection member is outside the outer periphery of the main surface of the first solar battery cell.

  In the feature of the present invention, the solar cell module preferably further includes a filler disposed between the first connection member and the bus bar electrode.

  Moreover, it is desirable that the filler is disposed between the second connection member and the bus bar electrode.

  In the features of the present invention, the bus bar electrode preferably includes a paste portion formed of a conductive paste and a metal foil bonded on the paste portion.

  Two or more second connection members are bonded to the bus bar electrode and the first connection member so as to absorb the difference in thermal expansion and contraction between the first solar cell and the first connection member, respectively. . Thereby, while suppressing the curvature of a cell board by the difference in the amount of thermal expansion and contraction of the 1st photovoltaic cell and the 1st connection member, between two bus-bar electrodes and the 1st connection member electrically Can be connected.

  Since the bonding portion between the bus bar electrode and the second connection member is outside the outer periphery of the main surface of the first solar battery cell, the second connection member is not overlapped with the first solar battery cell. Can be bonded to the bus bar electrode. Therefore, connection work on the main surface of the first solar cell is reduced, workability is improved, and yield is improved.

  By placing the filler between the first connection member and the bus bar electrode, when pressure is applied to press the first connection member against the main surface of the first solar cell in the manufacturing process of the solar cell module. Moreover, the stress which a filler adds to a 1st photovoltaic cell can be disperse | distributed, and a cell crack can be suppressed.

  By arranging the filler between the second connection member and the bus bar electrode, when a pressure is applied to press the second connection member against the first solar cell in the manufacturing process of the solar cell module, The stress which a filler adds to a 1st photovoltaic cell can be disperse | distributed, and a cell crack can be suppressed.

  By arrange | positioning the 1st connection member on the main surface of a 1st photovoltaic cell, the overlap with a 1st connection member and a bus-bar electrode is avoided, and the increase in the thickness of a solar cell module is suppressed. . Therefore, the flatness of the module surface is improved and pressure concentration is suppressed.

Embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals.
(First embodiment)
With reference to FIG. 1, the structure of the solar cell module concerning the 1st Embodiment of this invention is demonstrated. The solar cell module includes a plurality of solar cell groups G _{1 to} G _{n formed} by electrically connecting a predetermined number of solar cells arranged in the first direction (X direction) in series, and a plurality of solar cells. And a first connecting member 12 that electrically connects the battery groups G _{1 to} G _n in series. FIG. 1 illustrates a case where the solar cell module includes n solar cell groups. The n solar cell groups are referred to as first to nth solar cell groups G _{1 to} G _n . And these solar cell groups G ₁ ~G _n is between a not shown light-receiving surface side protection member and the back-surface-side protective member are sealed with a sealing material made of a thermoplastic resin.

Each of the _{first to} n-th solar cell groups G _{1 to} G _n electrically connects a predetermined number of solar cells and a predetermined number of solar cells arranged in the X direction in series. Tab wiring 11a, 11b is provided. Solar cell groups _G 1 ~G _n of first through n in FIG. 1 will be described the case where each comprising k number of the solar cell _C 1 -C _k. The first solar cell group _{G 1} includes a solar cell _C 11 _{-C 1k,} the second solar cell group _{G 2} comprises a solar cell _C 21 _{-C 2k.} Similarly, the third to n-th solar cell groups G _{3 to} G _n include solar cells C _{31 to} C _3k ,..., C _{n1 to} C _nk .

The k solar cells C _{11 to} C _1k included in the first solar cell group G ₁ are arranged in order along the first direction (X direction). In each of the solar cells C _{11 to} C _1k , electrodes having different polarities are provided on the first main surface and the second main surface facing the first main surface, respectively. The k solar cells C _{11 to} C _1k are alternately arranged so that electrodes having different polarities in adjacent solar cells face the same direction. The solar cells C _{11 to} C _{1k each} have a photoelectric conversion unit that generates a photogenerated carrier by light incidence from both surfaces of the first and second main surfaces, and a positive / negative sign for taking out the photogenerated carrier generated by the photoelectric conversion unit. A pair of electrodes. A pair of positive and negative electrodes is provided on each of the first main surface and the second main surface. Here, a case where the positive electrode is formed on the first main surface side and the negative electrode is formed on the second main surface side will be described. The positive electrode of the solar cell _{C 11} (first main surface), a negative electrode (second main surface) of the solar cell _{C 12,} the positive electrode (first main surface) of the solar cell _{C 13,} · · · solar cell The positive electrodes (first main surfaces) of the cells C _1k are arranged to face the same direction.

k pieces of the solar cell C ₁₁ -C _1k are electrically connected in series two of the wiring member 11a, 11b is the same side of the first solar cell and the third solar cells adjacent in the X direction By connecting the electrodes exposed on the surface, the first solar cell and the third solar cell adjacent in the X direction are electrically connected in series. 2 of the wiring member 11a, 11b, respectively, connected between the negative electrode exposed to the surface side of the positive electrode and the solar cell C ₁₂ which is exposed on the surface side of the solar cell C _11, the solar cell C ₁₂ connects between the negative electrode which is exposed to the outside on the back side of the positive electrode and the solar cell C ₁₃ which is exposed to the outside on the back side, ..., the solar cell C _1k-1 on the back side to the exposed the positive electrode and the solar cell The negative electrode exposed on the back side of C _1k is connected.

The k solar cells C _{1 to} C _k and the tab wirings 11a and 11b included in the other second to nth solar cell groups G _{2 to} G _n are also the first except for the differences shown below. a solar cell group _{G 1} comprises k number of solar cells _C 11 _{-C 1k} and the wiring member 11a, the same structure as 11b. The difference is that the second, fourth, sixth, ..., the solar cell group _G 2 of the second _n, G _4, G 6, ..., in _{G n,} the negative electrode of the solar cell _{C 1} (second main surface) of the solar cell C ₂ positive electrode (first main surface), a negative electrode (second main surface of the solar cell C _3), the negative electrode of the ... solar cell C _k (second main Are arranged in the same direction. That is, the order of replacement of the negative electrode and the positive electrode in the even-numbered solar cell groups G ₂ , G ₄ , G ₆ ,..., _Gn is changed to the odd-numbered solar cell groups G ₁ , G ₃ , G ₅ ,. • Reverse for G _n−1 .

The first to n-th solar cell groups G _{1 to} G _n are in order in the short direction (second direction: Y direction) of the solar cell group substantially perpendicular to the first direction (X direction). Are listed. Therefore, the solar cell C _{11 (the} first solar cell) and the solar cell C ₂₁ located in the second end of the solar cell group G _{2 (second} located at a first end of the solar cell group G ₁ The solar cells) are arranged so that electrodes having different polarities face in the same direction. That is, the positive electrode of the solar cell C ₁₁ in the surface side of the solar cell module (first principal surface) and a negative electrode of the solar cell C ₂₁ (second main surface) is placed. Similarly, solar cell C _2k (first solar cell) located at one end of _second solar cell group G ₂ and solar cell C _3k (first solar cell) located at one end of _third solar cell group G ₃ 2 solar cells) are arranged such that electrodes of different polarities face in the same direction, ..., solar cells C _n- positioned at one end of the ( _{n-1) th} solar cell group _{Gn-1. 11} (first solar battery cell) and solar battery cell C _n1 (second solar battery cell) located at one end of _n-th solar battery group G _n so that electrodes having different polarities face the same direction. Be placed.

The first connecting member 12 electrically connects two solar cell groups G _{1 to} G _n adjacent in the Y direction in series. The first connecting member 12, respectively, electrically connected in series to the first solar cell and the second solar cell located at one end of the second solar cell group G ₁ ~G _n adjacent in the Y direction To do. The first solar cell and the second solar cell located at one end of two solar cell groups G _{1 to} G _n adjacent in the Y direction are arranged such that electrodes having different polarities face the same direction. Therefore, the 1st connection member 12 connects the electrodes exposed on the back surface side or surface side of the solar cell module. In the example of FIG. 1, it has shown about the case where the electrode exposed on the back surface side of the solar cell module is connected. The first connecting member 12, respectively, between the solar cells _{C 11} and the solar cell _{C 21,} between the solar cells _{C 2k} and the solar cell _{C 3k,} the solar cell _{C 31} and the solar cell _{C 41} Between the solar cells C _n-11 and the solar cells C _n1 are connected in series. In this manner, the first connecting member 12 is electrically connected in series to the solar cell groups G ₁ ~G _n of first through n. In the embodiment of the present invention, the case where the first connecting member 12 electrically connects the two solar cell groups G _{1 to} G _n adjacent in the Y direction in series will be described. The invention is not limited to this, and can also be applied to a case where they are electrically connected in parallel.

  The solar cell module has a cell structure in which solar cells are arranged in a k × n matrix. A region where the k × n solar cells are arranged is referred to as a “cell region”. The 1st connection member 12 has connected between the 1st photovoltaic cell and 2nd photovoltaic cell which adjoin the Y direction within this cell area | region.

The solar cells C _1k and C _nk positioned at both ends of a series of first to n-th solar cell groups G _{1 to} G _n electrically connected in series by the first connection member 12 include: An output terminal T1 and an output terminal T2 for taking out the electric power generated by the solar cell module are connected to each other.

2 (a) is an enlarged plan view showing the back surface side of the structure of the solar cell C ₁₁ located in the first end of the solar cell group G _1, FIG. 2 (b), 2 ( It is sectional drawing along the AA cut surface of a). Referring to FIGS. 2 (a) and 2 (b), will be described the back surface structure of the solar cell C _{11 (the} first solar cell).

Solar cell C ₁₁ is not shown, it comprises a photoelectric conversion unit for generating photogenerated carriers by light incident from both surfaces of the first and second main surfaces. A collector electrode made up of a plurality of narrow finger electrodes and wide bus bar electrodes 21a and 21b is formed on the first and second main surfaces of the photoelectric conversion section. In the figure, the finger electrodes are omitted.

  The collector electrode is an electrode that collects photogenerated carriers generated by the photoelectric conversion unit, and is formed into a comb shape, for example, by combining finger electrodes extending in the Y direction and bus bar electrodes 21a and 21b extending in the X direction. Has been. The finger electrode is an electrode for collecting photogenerated carriers generated by the photoelectric conversion unit, and is arranged over almost the entire light incident surface of the photoelectric conversion unit. The bus bar electrodes 21a and 21b are electrodes for collecting photogenerated carriers collected by a plurality of finger electrodes, and have a predetermined interval along the X direction so as to intersect all the finger electrodes. And formed in a line shape. The finger electrodes and bus bar electrodes 21a and 21b are made of a conductive metal material formed by firing, for example, silver paste or the like. Further, the number of bus bar electrodes 21a and 21b per one solar battery cell is appropriately set in consideration of the size and resistance of the solar battery cell. In the embodiment of the present invention, a case where one solar battery cell includes two bus bar electrodes 21a and 21b will be described, but the number of bus bar electrodes included in one solar battery cell may be three or more.

On the solar cell _{C 11,} bus bar electrode 21a extending in the X direction, 21b are formed. A metal foil may be bonded onto the bus bar electrodes 21a and 21b. In FIG. 2, bus bar electrodes 21a and 21b to which metal foil is bonded are arranged.

  The first connection member 12 is a wiring having a longitudinal direction in the Y direction, and is disposed on the bus bar electrodes 21a and 21b and intersects with the bus bar electrodes 21a and 21b. It is not glued. Around the intersection of the first connecting member 12 and the bus bar electrodes 21a, 21b, second connecting members 13a, 13b that electrically connect the first connecting member 12 and the bus bar electrodes 21a, 21b. Is arranged. As described above, the first connection member 12 is not directly fixed to the bus bar electrodes 21a and 21b and is not directly electrically connected thereto. However, the bus bar is not connected to the bus bar electrodes 21a and 21b via the second connection members 13a and 13b. It is indirectly fixed to the electrodes 21a and 21b and is indirectly electrically connected. Each of the first connection member 12 and the second connection members 13a and 13b is, for example, a wiring obtained by tin plating the surface of a copper foil.

Second connecting members 13a, 13b are bonded in bonding locations _{S 1} to the first connection member 12 are bonded in the bonding portions _{S 2} bus bar electrode 21a, the 21b. The adhesion location S ₁ and the adhesion location S ₂ are formed at a distance that absorbs the difference in thermal expansion and contraction between the solar battery cell and the first connection member 12. Accordingly, the second connecting member 13a, a 13b, respectively, so as to absorb the difference in thermal expansion amount between the solar cell _{C 11} and the first connecting member 12, the bus bar electrodes 21a, 21b and the first connection It can be adhered to the member 12. Therefore, the bus bar electrodes 21a, 21b and the first are suppressed while suppressing the warpage of the solar cell C ₁₁ (cell substrate) due to the difference between the thermal expansion amount and the thermal contraction amount between the solar cell C ₁₁ and the first connection member 12. The connection members 12 can be electrically connected to each other. Second connecting members 13a, 13b are bus bar electrode 21a, disposed on 21b, a wiring for the X direction is the longitudinal direction, the second connecting member 13a, the connection portions _{S 1} to one end of 13b formed is, the second connecting member 13a, the connecting point _{S 2} on the other end of the 13b are formed.

In the first embodiment, the connection portions S ₁ and S ₂ are formed at both ends in the longitudinal direction of the second connection members 13a and 13b, so that the second connection members 13a and 13b are respectively solar cells. It is absorbed as a cell C ₁₁ differential thermal expansion and contraction of the first connecting member 12. However, the second connecting member 13a for absorbing the difference in thermal expansion amount between the solar cell C ₁₁ and the first connecting member 12, 13b construction of is not limited thereto. In addition to this, for example, in the second connection members 13 a and 13 b, the connection locations S ₁ and S ₂ are formed at positions separated from each other, whereby the solar battery cell C ₁₁ and the first connection member 12 are connected. The difference in thermal expansion and contraction can be absorbed.

The first connecting member 12 and the second connecting member 13a, as the 13b of the connection procedure, first, a first connecting member 12 and the second connecting member 13a, superimposed and 13b, locally adhering portions _{S 1} By applying heat, the first connecting member 12 and the second connecting members 13a and 13b are bonded. This task is not necessary to perform on the solar cell C _11. Thereafter, the first connecting member 12 and the second connecting member 13a, the adhesion of 13b, the bus bar electrode 21a of the solar cell _{C 11,} superimposed on 21b, locally applying heat to the bonding position _{S 2} Thus, the second connecting members 13a and 13b are bonded to the bus bar electrodes 21a and 21b. This operation is performed on the solar cell C _11. Thus, firstly, the first connecting member 12 and the second connecting member 13a, by bonding between 13b, reduces the number of operations performed on the solar cell C _11, improved workability, yield improves.

In the first embodiment, the case where the bus bar electrodes 21a and 21b have a metal foil has been described. However, in the first embodiment, the bus bar electrodes 21a and 21b may have no metal foil. Good.
(Second Embodiment)
In the first embodiment, the second connecting members 13a, 13b and the bus bar electrode 21a, but adhering portions S ₂ 21b has been described to be formed on the solar cell C _11, the present invention is limited to It will never be done. In the second embodiment of the present invention, the bus bar electrodes 21a, 21b and the second connecting member 13a, the adhesive portion _{S 2} of the 13b, the outer periphery of the main surface of the solar cell _{C 11} (the first solar cell) The case where it forms outside is demonstrated.

Referring to FIG. 3 (a) and 3 (b), will be described the back surface structure of the solar cell C _{11 (first} solar cell) in the second embodiment. Bus bar electrodes 21a, 21b is extended toward the -X direction, the ends of the bus bar electrodes 21a, 21b are disposed outside the outer periphery of the main surface of the solar cell _{C 11.} Specifically, the bus bar electrodes 21a and 21b are configured by adhering a metal foil on an electrode material formed of a conductive paste, and the metal foil is extended in the −X direction, and ends thereof. parts are disposed outward from an outer periphery of the solar cell C _11. The second connection members 13 a and 13 b are superimposed on the bus bar electrodes 21 a and 21 b outside the outer periphery of the main surface of the solar battery cell C ₁₁ and on the first connection member 12. Second connecting members 13a, 13b, at the outer side than the outer periphery of the main surface of the solar cell _{C 11,} is connected bus bar electrode 21a, 21b, respectively. In other words, the second connecting members 13a, 13b and the bus bar electrode 21a, the adhesive portion _{S 2} of 21b is formed outside the outer periphery of the main surface of the solar cell _{C 11.} About another point, it is the same as that of the structure of Fig.2 (a) and FIG.2 (b), and abbreviate | omits description.

The first connecting member 12 and the second connecting member 13a, as the 13b of the connection procedure, first, a first connecting member 12 and the second connecting member 13a, superimposed and 13b, locally adhering portions _{S 1} By applying heat, the first connecting member 12 and the second connecting members 13a and 13b are bonded. This task is not necessary to perform on the solar cell C _11. Thereafter, the first connecting member 12 and the second connecting member 13a, the adhesion of 13b, the bus bar electrode 21a of the solar cell _{C 11,} superimposed on 21b, locally applying heat to the bonding position _{S 2} Thus, the second connecting members 13a and 13b are bonded to the bus bar electrodes 21a and 21b. This work may be performed outside than the outer periphery of the main surface of the solar cell C _11. Thus, the bus bar electrodes 21a, 21b and the second connecting member 13a, the adhesive portion _{S 2} of 13b, by an outer side than the outer periphery of the main surface of the solar cell _{C 11,} a main solar cell _{C 11} Connection work on the surface is reduced, workability is improved, and yield is improved.
(Third embodiment)
In the first and second embodiments, the case where the first connecting member 12 is disposed immediately above the bus bar electrodes 21a and 21b has been described. However, the present invention is not limited to this. In the third embodiment of the present invention, a case where the filler 14 is disposed between the first connecting member 12 and the bus bar electrodes 21a and 21b will be described.

Referring to FIG. 4 (a) and 4 (b), will be described the back surface structure of the solar cell C _{11 (first} solar cell) in the third embodiment. Between the first connecting member 12 and the solar cell C _11, sealing member 14 is inserted. The planar shape of the filler 14 is the same as that of the first connecting member 12. In the example of FIGS. 2 and 3, the first connecting member 12 and the bus bar electrodes 21a and 21b are not bonded, but can be electrically contacted. However, in the third embodiment, by inserting the filler 14, the first connection member 12 and the bus bar electrodes 21a and 21b are electrically insulated, and the first connection member 12 and the bus bar are electrically insulated. The electrodes 21a and 21b are electrically connected only through the second connection members 13a and 13b. About another point, it is the same as that of the structure of Fig.3 (a) and FIG.3 (b), and abbreviate | omits description.

The first connecting member 12 and the bus bar electrode 21a, by arranging the filler 14 between 21b, in the manufacturing process of the solar cell modules presses the first connecting member 12 to the main surface of the solar cell C ₁₁ when pressure is applied, the filling material to disperse stress applied to the solar cell C _11, it is possible to suppress the cell fracture.
(Fourth embodiment)
In the first to third embodiments, the first connecting member 12 and the bus bar electrode 21a, but 21b has been described that are superimposed on the normal direction of the principal surface of the solar cell C _11, the present invention will now It is not limited to. In the fourth embodiment of the present invention, the first connecting member 12 and the bus bar electrode 21a, 21b is possible without the mutually stacked, will be described the case where each is located on the main surface of the solar cell C ₁₁ .

Referring to FIG. 5 (a) and 5 (b), will be described the back surface structure of the solar cell C _{11 (first} solar cell) in the fourth embodiment.

FIGS. 3 (a) or the like of the bus bar electrode 21a, but 21b were formed to the outer periphery of the main surface of the solar cell _{C 11,} in the fourth embodiment, the bus bar electrodes 21a, 21b are of the solar cell _{C 11} without being formed to the outer periphery of the main surface, the ends of the bus bar electrodes 21a, 21b are disposed inside the outer periphery of the main surface of the solar cell C _11. First connecting member 12 extending along a direction substantially perpendicular to the bus bar electrode 21a, 21b is disposed on the bus bar electrodes 21a, 21b are not formed part of the principal surface of the solar cell C ₁₁ ing. That is, the bus bar electrodes 21a and 21b and the first connecting member 12 do not intersect. Here, the case where the 1st connection member 12 is arrange | positioned adjacent to the edge part of bus-bar electrode 21a, 21b is illustrated. Second connecting members 13a, 13b is on and the bus bar electrode 21a of the first connecting member 12 is disposed on the 21b, the first connecting member 12 and the bus bar electrode 21a in the adhesive portion _{S 1} and the adhering portions _{S 2} , 21b. About another point, it is the same as that of the structure of FIG. 2A and FIG.

According to the fourth embodiment, since the first connecting member 12 is disposed on the main surface of the solar cell C _11, the first connecting member 12 and the bus bar electrode 21a, overlaps with 21b This avoids the increase in the thickness of the solar cell module. Therefore, the flatness of the module surface is improved and pressure concentration is suppressed.

  As described above, the present invention has been described according to the first to fourth embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Although the case where the filler 14 is further added to the configuration of the second embodiment is shown in the third embodiment, the application of the filler 14 is not limited to this, and the first embodiment You may add the filler 14 further with respect to the structure of embodiment.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters according to the scope of claims reasonable from this disclosure.

FIG. 1 is a plan view showing the configuration of the light-receiving surface side of the solar cell module according to the first embodiment of the present invention. 2 (a) is an enlarged plan view showing the back surface side of the structure of the solar cell C ₁₁ located in the first end of the solar cell group G _1, FIG. 2 (b), 2 ( It is sectional drawing along the AA cut surface of a). 3 (a) is, in the second embodiment, it is an enlarged plan view showing the back surface side of the structure of the solar cell C ₁₁ located in the first end of the solar cell group G _1, FIG. 3 (B) is sectional drawing along the BB cut surface of Fig.3 (a). 4 (a) is in the third embodiment is a plan view showing an enlarged rear side of the structure of the solar cell C ₁₁ located in the first end of the solar cell group G _1, FIG. 4 (B) is sectional drawing which followed the DD cut surface of Fig.4 (a). 5 (a) is, in the fourth embodiment, it is an enlarged plan view showing the back surface side of the structure of the solar cell C ₁₁ located in the first end of the solar cell group G _1, 5 (B) is sectional drawing along the EE cut surface of Fig.5 (a).

Explanation of symbols

11a, 11b ... tab wire 12 ... first connecting member 13a, 13b ... second connecting member 14 ... filler 21a, 21b ... bus bar electrode C ... solar cell G ... solar cell group S _1, S 2 _... adhering portions T1, T2 ... Output terminals

Claims (6)

A first solar cell in which two or more bus bar electrodes having a first direction as a longitudinal direction are disposed on a main surface;
Two or more bus bar electrodes having a first direction as a longitudinal direction are disposed on the main surface and are adjacent to the first solar cell and a second direction substantially orthogonal to the first direction. A second solar cell;
A first connecting member for electrically connecting the first solar cell and the second solar cell;
Two or more second connection members that electrically connect between the first connection member and two or more bus bar electrodes disposed on the main surface of the first solar cell,
The two or more second connecting members each absorb the difference in thermal expansion and contraction between the first solar cell and the first connecting member, and the bus bar electrode and the first connecting member. A solar cell module characterized in that it is adhered to a solar cell module. The first connection member is disposed at a position overlapping the first solar battery cell,
2. The solar cell module according to claim 1, wherein the second connection member is bonded to the bus bar electrode at a position not overlapping the first connection member.   3. The solar cell module according to claim 1, wherein an adhesion portion between the bus bar electrode and the second connection member is outside an outer periphery of a main surface of the first solar cell.   The solar cell module according to claim 1, further comprising a filler disposed between the first connection member and the bus bar electrode.   The solar cell module according to claim 4, wherein the filler is disposed between the second connection member and the bus bar electrode.   6. The solar cell module according to claim 1, wherein the bus bar electrode includes a paste portion formed of a conductive paste and a metal foil adhered on the paste portion.

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