JP2011077362A - Solar cell, and solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell and a solar cell module that can suppress cracking of a substrate of the solar cell and peeling of an electrode, and also suppress a decrease in yield. <P>SOLUTION: The solar cell includes one principal surface-side electrode 23 formed on one principal surface of the semiconductor substrate and the other principal surface-side electrode 22 formed on the other principal surface of the semiconductor substrate, a conductive connection member for connection being provided on the one principal surface-side electrode 23 and the other principal surface-side electrode 22, wherein an auxiliary film 23c is provided on the end side of the semiconductor substrate, and has its contour region wider than the width of the conductive connection member for connection being provided on the end side of the semiconductor substrate and also includes a part 234c where the auxiliary film 23c is not present in the contour region. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solar battery cell and a solar battery module.

  Solar cells are expected to be a new power source that converts the light from the sun into electricity and has a low environmental impact. In recent years, solar cell systems such as general household power generation systems and large-scale power plants and various applications Use in products is actively promoted.

  Under such circumstances, research and development of high performance, low cost, high durability, and the like are being actively conducted for the further spread of solar cells.

  A solar cell system is configured to include, for example, one or a plurality of solar cell modules. Generally, a solar cell module is electrically connected to a plurality of solar cells depending on its use such as a solar cell system or an application product. Connected in series.

  FIG. 21A is a perspective view of a solar battery cell used in a conventional solar battery module, and FIG. 21B is a cross-sectional view of the solar battery cell to which a conductive connecting member in the conventional solar battery module is connected. FIG. 22 is a partial cross-sectional view for explaining connection of solar cells in a conventional solar cell module.

  As shown in FIG. 21, the solar cell 100 includes, for example, a semiconductor substrate 101 having a pn junction, an antireflection film 102 is formed on the surface of the substrate 101, and finger electrodes 103 a A front side electrode 103 composed of the bus bar electrode 103b is formed.

  Further, on the back surface of the substrate 101, a back-side electrode 104 composed of a metal film-like current collecting electrode 104a and a bus bar electrode 104b is formed.

  Referring to FIG. 22, the solar cell module includes, for example, front-side electrodes 103, 103,..., Bus bar electrodes 103 b, 103 b,. Are connected in series or in parallel, by connecting the bus bar electrodes 104b, 104b,... With the conductive connecting members 105, 105,. .. Are arranged via a filler between a translucent member (not shown) and a back member, and a frame member is provided.

  In the manufacturing process of such a solar cell module, the conductive connection member expands and contracts greatly due to the temperature change in the step of connecting the conductive connection member to the solar cell and the step of modularization. The substrate may be broken, and the manufacturing yield may be deteriorated.

As a method for reducing cell cracking due to temperature change of the conductive connecting member when the conductive connecting member is solder-connected to the solar battery cell, it is known to widen the ends of the bus bar electrode and the conductive connecting member. (For example, refer to Patent Document 1).

JP 2009-141264 A

  Although the method of widening the end portion of the bus bar electrode can reduce the crack of the substrate of the solar battery cell due to the expansion and contraction of the conductive connection member due to the temperature change in the manufacturing process, since the wide portion increases the film stress, There is a risk of peeling from the end of the wide bus bar electrode.

  This invention is made | formed in view of the said subject, and can provide the photovoltaic cell and photovoltaic module which can suppress the crack of the board | substrate of a photovoltaic cell and peeling of an electrode, and can suppress the fall of a yield.

The solar cell of the present invention includes a semiconductor substrate, the one main surface side electrode formed on one main surface of the semiconductor substrate, and the other main surface formed on the other main surface of the semiconductor substrate. A solar cell comprising a main surface side electrode, wherein a conductive connecting member for connection is provided on the one main surface side electrode and the other main surface side electrode, on an end side of the semiconductor substrate An auxiliary membrane, the auxiliary membrane has a portion whose contour region is wider than the width of the conductive connecting member for connection provided on the end side, and the auxiliary membrane has the auxiliary membrane within the contour region. It has a portion that does not exist.

  In such a solar cell, since the contour region of the auxiliary film has a portion wider than the width of the conductive connecting member for connection provided on the end side on the one main surface of the semiconductor substrate, A predetermined area of a large area on the end side on the main surface of the solar cell can be covered, and cracking of the substrate of the solar battery cell due to expansion and contraction of the conductive connection member due to temperature change in the manufacturing process can be reduced.

  In addition, since the auxiliary film has a portion where the auxiliary film does not exist in the contour region, even if the area is increased, the film stress can be reduced and the peeling of the one main surface side electrode can be suppressed.

  The auxiliary film functions as a reinforcing film and functions as a cell crack prevention film.

  As a result, the yield of solar cells is improved.

  There may be a plurality of portions where the auxiliary film does not exist. In this case, it is preferable that the portions where the plurality of auxiliary films do not exist are regularly arranged.

  Further, the portions where the plurality of auxiliary films are not present may have the same size and shape.

  It is preferable that the auxiliary film is substantially symmetric with respect to the center line in the longitudinal direction of the position where the conductive connecting member for connection is provided.

  The auxiliary film may be integrated with the one main surface side electrode.

  In this case, the auxiliary film is preferably made of a conductive material, and more preferably made of the same material as the one main surface side electrode. Thus, the auxiliary film made of a conductive material can also function as a current collecting electrode.

  The auxiliary film may be provided on one end side of the semiconductor substrate or may be provided on both end sides.

The one main surface side electrode may be an electrode on the opposite side to the side that mainly receives light.
In this case, light shielding loss due to the auxiliary film can be suppressed.

The one main surface side electrode may be an electrode mainly receiving light.
In this case, the auxiliary film has a portion where the auxiliary film does not exist in the contour region, and light can be transmitted from this portion, so that the light shielding loss can be suppressed as compared with the solid film.

  The contour region may be wide on the end side of the semiconductor substrate and narrow on the center side of the semiconductor substrate.

  In this case, it is possible to reduce the crack of the substrate of the solar battery cell and to suppress the peeling of the one main surface side electrode while reducing the material of the auxiliary film.

  The portion where the auxiliary film does not exist in the contour region may be an opening of the auxiliary film.

  The auxiliary film may have a mesh structure.

  The auxiliary film may be composed of a plurality of strip films.

  The plurality of strip films may be parallel to each other.

  The one main surface side electrode may include a collector electrode.

  The collector electrode may be a finger electrode.

  The one main surface side electrode may include a plurality of finger electrodes.

  Further, the one main surface side electrode may include a bus bar electrode.

  The bus bar electrode may have a non-linear shape.

  The bus bar electrode may be a narrow electrode.

  The other main surface side electrode is provided with an auxiliary film on the end side on the other main surface of the semiconductor substrate, and the auxiliary film has a contour region provided on the end side on the other main surface. The conductive connecting member may have a portion wider than the width of the conductive connecting member, and the auxiliary film may have a portion where the auxiliary film does not exist in the contour region.

  The solar cell module of the present invention includes the solar cell.

  The connection between the one main surface side electrode and the conductive connecting member for connection may be made by using an adhesive made of resin, or by melting and solidifying solder.

  The adhesive made of the resin may include conductive particles such as Ni and Ag, or may be a conductive adhesive. Further, non-conductive materials such as non-conductive particles such as SiO 2 may be included, or both of them may not be included.

  The resin is preferably a thermosetting resin, and an epoxy resin or the like can be used as appropriate.

  INDUSTRIAL APPLICABILITY The present invention can provide a solar battery cell and a solar battery module that can suppress cracking of the substrate of the solar battery cell and peeling of the electrode and can suppress a decrease in yield.

It is a top view of the solar cell module which concerns on 1st Embodiment of this invention. It is a perspective view of the solar cell module which concerns on 1st Embodiment of this invention. FIG. 2 is a partial cross-sectional view of a solar cell module along A-A ′ in FIG. 1. FIG. 4A is a top view of a solar battery cell used in the solar battery module according to the first embodiment of the present invention, and FIG. 4B is a back view of the solar battery cell. FIG. 5A is a back view for explaining the connection between the solar battery cell and the conductive connecting member in the solar battery module according to the first embodiment of the present invention, and FIG. It is sectional drawing along AA 'in the inside. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 1st Embodiment of this invention. FIG. 5 is a partial cross-sectional view for explaining the connection between the solar battery cell and the conductive connection member along A-A ′ in FIG. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 2nd Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 3rd Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 4th Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 5th Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 5th Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 6th Embodiment of this invention. It is a top view of the auxiliary | assistant film | membrane of the photovoltaic cell used for the solar cell module which concerns on 7th Embodiment of this invention. FIG. 15 (a) is a top view of a solar battery cell used in the solar battery module according to the eighth embodiment of the present invention, FIG. 15 (b) is a back view of the solar battery cell, and FIG. 15 (c) is the present invention. It is a top view for demonstrating the connection of the photovoltaic cell and electroconductive connection member in the solar cell module which concerns on this 8th Embodiment. 16 (a) is a top view of a solar battery cell used in the solar battery module according to the ninth embodiment of the present invention, FIG. 16 (b) is a back view of the solar battery cell, and FIG. 16 (c) is the present invention. It is a top view for demonstrating the connection of the photovoltaic cell and electroconductive connection member in the solar cell module which concerns on 9th Embodiment of this. FIG. 17 (a) is a top view of a solar battery cell used in the solar battery module according to the tenth embodiment of the present invention, FIG. 17 (b) is a back view of the solar battery cell, and FIG. 17 (c) is the present invention. It is a top view for demonstrating the connection of the photovoltaic cell in the solar cell module which concerns on 10th Embodiment, and an electroconductive connection member. It is a partial cross section for demonstrating the connection of the said photovoltaic cell and electroconductive connection member along A-A 'in FIG.17 (c). FIG. 19 (a) is a top view of a solar battery cell used in the solar battery module according to the eleventh embodiment of the present invention, FIG. 19 (b) is a back view of the solar battery cell, and FIG. 19 (c) is the present invention. It is a top view for demonstrating the connection of the photovoltaic cell and electroconductive connection member in the solar cell module which concerns on 11th Embodiment of this. It is a partial cross section figure of the other solar cell module which concerns on this invention. FIG. 21A is a perspective view of a solar battery cell used in a conventional solar battery module, and FIG. 21B is a cross-sectional view for explaining the connection between the solar battery cell and the conductive connection member. It is a partial cross section figure for demonstrating the connection of the photovoltaic cell and the conductive connection member in the conventional solar cell module.

Next, embodiments of the present invention will be described with reference to the drawings. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
(First embodiment)
A solar cell module according to a first embodiment of the present invention will be described with reference to the drawings.

  1 is a top view of the solar cell module according to the present embodiment, FIG. 2 is a perspective view of the solar cell module, and FIG. 3 is a cross-sectional view of a part of the solar cell module along AA ′ in FIG. 4 (a) is a top view of the solar battery cell used in the solar battery module, FIG. 4 (b) is a back view of the solar battery cell, and FIG. 5 (a) is the sun according to the first embodiment of the present invention. FIG. 5B is a cross-sectional view taken along line AA ′ in FIG. 5A, and FIG. 6 is provided in the solar battery cell for explaining the connection of the solar battery cells in the battery module. FIG. 7 is a partial cross-sectional view for explaining the connection between the solar cell and the conductive connecting member along AA ′ in FIG. 4A.

  1 to 3, reference numeral 1 denotes a solar cell module, and the solar cell module 1 is made of, for example, a transparent surface side cover 2 such as white plate reinforced glass, and a resin film such as polyethylene terephthalate (PET). A plurality of solar cells 5, 5,... Disposed between a weather-resistant back cover 3 and a filler 4 such as ethylene vinyl acetate (EVA) between the front cover 2 and the back cover 3. Is a width of 0.5 mm to 4 mm made of a flat copper wire or the like whose surface is coated with a solder layer (conductive layer) 6a, 6a, 6a, 6a, etc. of Sn-Ag-Cu having a thickness of 5 to 50 μm, It consists of linear solar cell groups 7, 7,... Electrically connected in series by strip-like (band-like) conductive connection members 6, 6, 6, 6,. Plate-like structure And body, and a metal frame 8 made of aluminum or the like for supporting the above constituting adult.

  Each of the solar cell groups 7, 7,... Is arranged in parallel with each other, and each predetermined adjacent solar cell group 7, 7 so that the solar cell groups 7, 7,. The surface of the conductive connecting member 6, 6, 6, 6,... Is covered with a solder layer (conductive layer) 6a, 6a, 6a, 6a,. The conductive connection members 6 and 6 on the other end side of other predetermined adjacent solar cell groups 7 and 7 are solder-connected by strip-shaped (band-shaped) conductive connection members 9 made of flat copper wires and the like. , 6, 6,... Are composed of a flat copper wire or the like whose surface is covered with a solder layer (conductive layer) 6 a, 6 a, 6 a, 6 a,. The electrode-shaped conductive connection members 10 and 11 are solder-connected.

  With this configuration, the plurality of solar cells 5, 5,... Of the solar cell module 1 are arranged in a matrix.

  In the outermost solar cell groups 7, 7,..., The conductive connection members 6, 6, 6, 6,. Is an L-shaped connection made of a flat copper wire or the like whose surface is covered with a solder layer (conductive layer) such as Sn—Ag—Cu having a width of 3 mm and a thickness of 30 μm for extracting electric output from the solar cell module 1 Members (output extraction connecting members) 12 and 13 are connected by soldering.

  The portions intersecting between the L-shaped connecting members 10 and 11 and the L-shaped connecting members 12 and 13 and between the L-shaped connecting member 11 and the L-shaped connecting member 13 are as follows. An insulating member such as an insulating sheet such as polyethylene terephthalate (PET) (not shown) is interposed.

  Although not shown in the drawings, the front end side portions of the L-shaped connecting member 10, the L-shaped connecting member 11, the L-shaped connecting member 12, and the L-shaped connecting member 13 are provided on the back surface side cover 3. It is led in the terminal box 14 so that it may be located in the upper center of the solar cell module 1 through the notch.

  In the terminal box 14, between the L-shaped connecting member 12 and the L-shaped connecting member 10, between the L-shaped connecting member 10 and the L-shaped connecting member 11, and L-shaped The connection member 11 and the L-shaped connection member 13 are connected by a bypass diode (not shown).

  Referring to FIGS. 4 to 7, the solar battery cell 5 is, for example, a double-sided light receiving solar battery cell. As an example, the solar battery cell 5 is formed on substantially the entire surface of the n-type single crystal silicon substrate 15 having the texture structure. , An i-type amorphous silicon layer 16, a p-type or n-type one-conductive amorphous silicon layer 17, a transparent conductive film layer 18 made of indium oxide (ITO) film containing tin, and the like. A transparent conductive film layer comprising an i-type amorphous silicon layer 19, an amorphous silicon layer 20 having a conductivity type opposite to the one conductivity type, an indium oxide (ITO) film containing tin, and the like on substantially the entire back surface having a texture structure. 21 is a solar cell having a so-called HIT structure including a photoelectric conversion unit.

  The n-type single crystal silicon substrate 15 of the present embodiment is, for example, a substantially square of about 125 mm square, and the thickness is, for example, 100 μm to 300 μm.

  In the solar cell 1, a front side electrode 22 is formed on the transparent conductive film 18, and a back side electrode 23 is formed on the transparent conductive film 21.

  The front-side electrode 22 is made of a conductive material, for example, mainly made of silver, and a plurality of narrow linear finger electrodes arranged in parallel to each other so as to cover substantially the entire surface of the transparent conductive film layer 18. 22a, 22a,... And two parallel straight (band-shaped) bus bar electrodes 22b, 22b connected so as to be substantially orthogonal thereto.

  In this embodiment, the thickness of the finger electrode 22a is set to 20 to 50 μm, for example, 30 μm, the width is 30 to 150 μm, preferably 80 to 100 μm, for example, a 100 μm thin wire electrode, and 1 to 5 mm. It arrange | positions at intervals, for example, 2 mm intervals.

  The bus bar electrodes 22b and 22b are set to have a thickness of 20 to 50 μm, for example, 30 μm linear electrodes, and have a width of 0.1 to 5 mm, for example 2 mm.

  The back-side electrode 23 is made of a conductive material, for example, mainly made of silver, and a plurality of narrow linear finger electrodes arranged in parallel to each other so as to cover substantially the entire surface of the transparent conductive film layer 21. 23a, 23a..., Two parallel straight (band-shaped) bus bar electrodes 23b and 23b connected so as to be substantially orthogonal thereto, and both ends in the longitudinal direction of the bus bar electrodes 23b and 23b, that is, Auxiliary films 23c, 23c, 23c which are non-solid films configured to cover a predetermined region on the end side of the back surface of the substrate 15 and to expose the transparent conductive film 21 on the predetermined region at a plurality of locations. , 23c.

  In the present embodiment, the bus bar electrodes 23b and 23b are disposed to face the bus bar electrodes 22b and 22b of the front electrode 22 with the substrate 15 in between.

  The sizes (contour areas) of the auxiliary films 23c, 23c, 23c, and 23c are the same as the outline of the predetermined area, and the length in the longitudinal direction is 10 mm larger than the width of the conductive connecting member 6, and the length The length in the direction orthogonal to the direction is a rectangular shape of 20 mm larger than the width of the conductive connecting member 6. Note that the edge of the substrate 15 in the contour region of the auxiliary films 23c, 23c, 23c, and 23c is separated from the edge of the substrate 15 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary films 23c, 23c, 23c, 23c are linear connection lines 231c, 231c, ... made of the conductive material in the longitudinal direction, linear connection lines made of the conductive material in a direction orthogonal to the longitudinal direction. 232c, 232c,... And a connecting mesh 233c made of the conductive material provided at the contour position, and a plurality of rectangular openings 234c, 234c, which constitute the mesh structure. ... are regularly arranged and have the same size and shape.

  The auxiliary films 23c, 23c, 23c, and 23c are considered to be non-solid films having a structure having a large number of rectangular openings 234c, 234c,.

  The auxiliary films 23c, 23c, 23c, and 23c have a connecting line 233c at the contour position to further improve the adhesion strength. The connection line 233c may be omitted.

  Therefore, the auxiliary films 23c, 23c, 23c, and 23c are configured such that portions where the film does not exist (film-free portions) are regularly dispersed. As a result, the auxiliary films 23c, 23c, 23c, and 23c are The exposed portions in the predetermined area are regularly dispersed.

  The auxiliary film 23c is substantially symmetrical with respect to the corresponding bus bar electrode 23b, that is, the conductive connecting member 6 to be installed, that is, with respect to its center line along the longitudinal direction. The center line of 23b substantially coincides with the center line of the auxiliary film 23c. Therefore, the non-film portion and the exposed portion are arranged substantially symmetrically with respect to the corresponding bus bar electrode 23b, that is, with respect to the center line along the longitudinal direction thereof.

  The finger electrodes 23a, 23a,..., The bus bar electrodes 23b, 23b, and the auxiliary films 23c, 23c, 23c, 23c are integrated so as to be electrically connected to each other. Has been.

  In the present embodiment, the auxiliary film 23c is directly connected to the bus bar electrode 23b, and is also directly connected to part of the finger electrodes 23a, 23a.

  In this embodiment, the finger electrodes 23a, 23a... Are thin wire electrodes having a thickness of 10 to 30 μm, for example, 15 μm, and a width of 50 to 600 μm, preferably 100 to 200 μm, for example 100 μm. And set at intervals of 0.1 to 2 mm, for example, at intervals of 0.6 mm.

  The bus bar electrodes 23b, 23b are linear electrodes having a thickness of 10 to 30 μm, for example, 15 μm, a width of 0.1 to 5 mm, and 2 mm, for example.

The auxiliary film 23c has a thickness of 10 to 30 μm, for example, 15 μm,
The linear connecting lines 231c, 232c, and 233c are narrower than the connecting member 6 and wider than the finger electrodes 23a. Further, the linear connecting lines 231c, 232c, and 233c are narrower than the bus bar electrode 23b.

  The width and interval of the linear connecting line 231c in the longitudinal direction are, for example, a width of 200 μm and an interval of 1 mm, and the width and interval of the linear connecting line 232c in the direction orthogonal to the longitudinal direction are, for example, a width of 200 μm and an interval 0.3 mm.

In the present embodiment, the linear connecting lines 232c, 232c,.
Is a half of the interval (pitch) between the finger electrodes 23a, 23a,..., And the finger electrodes 23a, 23a,.
Are shared with the straight connecting lines 232c, 232c,.

When the front side electrode 22 and the back side electrode 23 are mainly made of silver, for example,
It is produced by thermosetting a silver paste, which is a thermosetting conductive paste mainly using an epoxy resin as a binder and silver particles as a conductive substrate.

  And between the adjacent solar cells 5, 5... Is between the bus bar electrodes 22b, 22b of the front side electrode 22 of one solar cell 5 and the bus bar electrodes 23b, 23b of the back side electrode 23 of the other solar cell 5. For example, it is mechanically and electrically connected by the conductive connection members 6 and 6 using an adhesive 24 made of a resin containing an epoxy resin. Note that the adhesive 24 may include a conductive filler such as nickel particles.

(Method for manufacturing solar cell module)
Below, the manufacturing method of the solar cell module which concerns on this embodiment is demonstrated. Here, as an example, the case where the front electrode 22 and the back electrode 23 are made of an epoxy thermosetting silver paste will be described.

  First, the solar cell 5 provided with the transparent electrode film layer 18 on both surfaces is prepared.

  Next, an epoxy thermosetting silver paste is printed by screen printing on the transparent electrode film layer 18 on the surface side of the solar battery cell 5 and dried at 150 ° C. for 10 minutes. On the transparent electrode film layer 21 on the back surface side, an epoxy thermosetting silver paste is printed by screen printing and simultaneously heated at 200 ° C. for 1 hour to completely cure the surface electrode 22 and the auxiliary film 23c. The back side electrode 23 is formed.

  Next, a plurality of conductive connection members 6, 6,... Are prepared, a portion facing each of the solar cells 5 on one surface of each conductive connection member 6, and the cells 5 on the other surface The adhesive 24 is applied to a portion facing the adjacent solar battery cell 5 using a dispenser so as to have a thickness of about 30 μm.

  Next, the adhesive 24 is applied on the bus bar electrode 22b of the front side electrode 22 of one of the adjacent solar cells 5 and 5 and on the bus bar electrode 23b of the back side electrode 23 of the other solar cell 5. With the conductive connecting members 6, 6,... Arranged so that the surfaces coated with the resin face each other, the adhesive 24 is cured by heating at 200 ° C. for 1 hour while pressing at about 2 MPa. Battery group 7 is produced. In this step, the solder layers (conductive layers) 6a, 6a, ... of the conductive connecting members 6, 6, ... are not melted.

  Here, in order to bond the solar cells 5, 5 and the conductive connection member 6, the conductive connection member 6 formed with the adhesive 24 is prepared, but the adhesive 24 is formed on the solar cell 5 by coating or the like. Alternatively, a film-like adhesive 24 is prepared and disposed on the bus bar electrodes 22b,..., 23b, and the conductive connection members 6, 6,. -You may connect by the method of heating and pressurizing in the state which arranged.

  Next, after preparing a plurality of solar cell groups 7 and preparing a structure to which the connection members 9, 9, 9 and connection members 10, 11, 12, 13 are attached, the surface side cover 2, sealing that becomes the filler A sheet, the structure, a sealing sheet as a filler, and a back surface side cover 3 are laminated in this order, and heat-pressed for 10 minutes at 150 ° C. in a vacuum state.

  Then, the said filler is hardened completely by heating at 150 degreeC for 1 hour.

  Finally, the terminal box 14 and the metal frame 8 are attached to complete the solar cell module 1.

  The width of the contour region of the auxiliary films 23c, 23c, 23c, and 23c is larger than the width of the conductive connection member 6, and covers the predetermined region on the end side of the back surface of the substrate 15 and the transparent conductive material on the predetermined region. It is a film | membrane comprised so that the film | membrane 21 may be exposed in several places.

  Accordingly, the auxiliary films 23c, 23c, 23c, and 23c can cover a predetermined area of a wide area (wide and vertically long) on the end side of the back surface of the substrate 15, so that the conductive connection member caused by temperature change in the manufacturing process 6 can reduce the cracking of the substrate of the solar battery cell due to the expansion and contraction of 6, and the auxiliary films 23c, 23c, 23c, and 23c have a portion where the film does not exist (non-film portion) even if the area is increased as described above. Therefore, it is possible to reduce the film stress and to suppress the back side electrode 23 from peeling off.

  Further, the auxiliary films 23c, 23c, 23c, 23c have a width of the contour region larger than the width of the conductive connecting member 6 and function as a reinforcing member against the pressure when the conductive connecting member 6 is connected. It is possible to reduce cracks in the substrate of the solar battery cell during the connection.

  Further, the auxiliary films 23c, 23c, 23c, 23c are formed by linear connecting lines 231c parallel to the extending direction of the bus bar electrode 23b (longitudinal direction of the connecting member 6 at the time of connection), and straight lines in the orthogonal direction. Since the grid-like mesh structure having the connection lines 232c has a portion where the film does not exist (non-film portion), it is possible to effectively reduce the cracking of the substrate.

  The large number of rectangular openings 234c, 234c,... Formed by the auxiliary films 23c, 23c,... Have the same size and are regularly arranged, so that the cracking of the substrate can be reduced more effectively. .

  The auxiliary film 23c has a symmetrical shape with respect to the bus bar electrode 23b, that is, with respect to its center line along the longitudinal direction thereof, and the center line of the bus bar electrode 23b is the center line of the auxiliary film 23c. Therefore, it is possible to effectively reduce the cracking of the substrate.

  Further, since the auxiliary film 23c is provided with a linear connecting line 231c extending in the longitudinal direction in the vicinity of the bus bar electrodes 23b, 23b, even if the adhesive 24 spreads laterally in the connecting step, The spread can be suppressed by the straight connecting lines 231c,.

In the present embodiment, the width and thickness of the linear connecting lines 232c,.
The end side of the substrate 15 may be increased in width or / and thickness.
(Second Embodiment)
A solar cell module according to a second embodiment of the present invention will be described. FIG. 8 is a top view of the auxiliary film according to the second embodiment.

  The difference from the first embodiment is the shape of the auxiliary film provided in the back side electrode, and the other is the same as in the first embodiment. The same parts are omitted from the description, and in FIG. Differences from the first embodiment will be described using the same reference numerals. The shape, size, and position of the contour region of the auxiliary membrane are the same.

  As shown in FIG. 8, the auxiliary film 33c of the back electrode 23 has a connecting line 331c,..., A connecting line 332c,... Having a width of 200 .mu.m, a thickness of 15 .mu.m and an interval of 200 .mu.m, and finger electrodes 23a, 23a,. And the bus bar electrodes 23b and 23b form an angle of about 45 degrees, and the connection lines 331c,... And the connection lines 332c,. It has a line 333c.

  In the auxiliary films 33c, 33c, 33c, 33c, a large number of rectangular openings 334c, 334c,... Constituting the mesh structure are regularly arranged, and have the same size and shape.

  The auxiliary films 33c, 33c, 33c, and 33c can be regarded as non-solid films having a structure in which a large number of rectangular openings 334c, 334c,.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

(Third embodiment)
A solar cell module according to a third embodiment of the present invention will be described. FIG. 9 is a top view of the auxiliary film according to the third embodiment.

  The difference from the first embodiment is the shape of the auxiliary membrane provided in the back side electrode, and the other is the same as the first embodiment, and the same parts are omitted from the description. In FIG. Differences from the first embodiment will be described using the same reference numerals. The shape, size, and position of the contour region of the auxiliary membrane are the same.

  As shown in FIG. 9, the auxiliary film 43c of the back electrode 23 has a configuration in which a large number of circular openings 434c, 434c,... Are formed in the solid film, and the openings 434c, 434c,. It is about 0.8 mm, and is arranged at an interval of about 1 mm in the longitudinal direction and at an interval of about 1 mm in a direction orthogonal to the longitudinal direction.

  The auxiliary films 43c, 43c, 43c, 43c are connected in the longitudinal direction and the direction perpendicular to the longitudinal direction, with the opening 434c, 434c adjacent to each other having a width of about 0.2 mm larger than the width of the finger electrode 23a. And a large number of circular openings 434c, 434c,... Having the same size and shape that are regularly arranged.

Also in this embodiment, the same effect as the first embodiment can be obtained.
(Fourth embodiment)
A solar cell module according to a fourth embodiment of the present invention will be described. FIG. 10 is a top view of the auxiliary film according to the fourth embodiment.

  The difference from the first embodiment is the shape of the auxiliary film of the back side electrode, and the others are the same as those of the first embodiment, and the same parts are omitted from description, and the same or similar parts in FIG. 10 are the same. Differences from the first embodiment will be described with reference numerals.

  As shown in FIG. 10, the auxiliary film 53c of the back electrode 23 is composed of four wide strip-like connecting lines 531c, 531c, 531c, 531c in parallel with the finger electrodes 23a, 23a,. A connecting line as the auxiliary film 53c is not provided in the longitudinal direction.

  The width of the connecting line 531c is larger than the width of the finger electrode 23a, for example, 450 μm, and the distance between the connecting lines 531c is 1 mm.

  The sizes (contour areas) of the auxiliary films 53c, 53c, 53c, 53c of the present embodiment are the same as the outline of the predetermined area, and are areas surrounded by dotted lines in FIG.

  The sizes (contour areas) of the auxiliary films 53c, 53c, 53c, 53c are the same as the outline of the predetermined area, and the length in the longitudinal direction is larger than the width of the conductive connection member 6 by about 4.8 mm. The length in the direction orthogonal to this is a rectangular shape of about 20 mm, which is larger than the width of the conductive connecting member 6. Note that the end of the substrate 15 in the contour region of the auxiliary films 53c, 53c, 53c, 53c is separated from the end of the substrate 15 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary film 53c has a substantially symmetrical shape with respect to the corresponding bus bar electrode 23b, that is, the conductive connecting member 6 to be installed, that is, with respect to its center line along the longitudinal direction thereof. That is, the center line of the conductive connection member 6 to be installed substantially coincides with the center line of the auxiliary film 53c.

  The auxiliary films 53c, 53c, 53c, and 53c of the present embodiment also have a width of the contour region that is larger than the width of the conductive connection member 6, and covers the predetermined region on the end side of the back surface of the substrate 15 and the predetermined region. It is a film | membrane comprised so that the said transparent conductive film 21 may be exposed in several places.

  Accordingly, since the auxiliary films 53c, 53c, 53c, 53c can cover a predetermined area of a wide area (wide, vertically long) on the end side of the back surface of the substrate 15, the conductive connection member due to a temperature change in the manufacturing process. 6 can reduce the cracking of the substrate of the solar battery cell, and the auxiliary films 53c, 53c, 53c, and 53c have a portion where the film does not exist (non-film portion) even if the area is increased as described above. Therefore, it is possible to reduce the film stress and to suppress the back side electrode 23 from peeling off.

  In the present embodiment, the auxiliary film 53c of the back electrode 23 does not have a connecting line in the longitudinal direction. However, in the connection process, the adhesive 24 cannot be prevented from spreading laterally. The same effect as the embodiment can be obtained.

  In addition, a plurality of parallel connection lines parallel to each other as the auxiliary film 53c may be provided in the longitudinal direction. For example, the width of the connection line is 100 μm narrower than the connection line 531c and the interval is 1 mm.

In this case, it is possible to suppress the adhesive 24 from spreading laterally in the connection step of the conductive connection member 6.
(Fifth embodiment)
A solar cell module according to a fifth embodiment of the invention will be described. FIG. 11 is a top view of the auxiliary film according to the fifth embodiment.

  The difference from the first embodiment is the shape of the auxiliary film of the back side electrode, and the others are the same as those of the first embodiment, and the same parts are omitted from description, and the same or similar parts in FIG. 11 are the same. Differences from the first embodiment will be described with reference numerals.

  As shown in FIG. 11, the auxiliary film 63c of the back electrode 23 is formed of a wide band-like connecting line orthogonal to the finger electrodes 23a, 23a,... As an auxiliary film 63c in the parallel direction. Are not provided, and the finger electrodes 23a, 23a,...

  The width of the connecting line 631c is larger than the width of the finger electrode 23a, for example, 450 μm.

  The sizes (contour areas) of the auxiliary films 63c, 63c, 63c, and 63c in this embodiment are areas surrounded by dotted lines in FIG.

  The auxiliary films 63c, 63c, 63c, 63c have a size (contour area) in which the length in the longitudinal direction is about 10 mm larger than the width of the conductive connecting member 6, and the length in the direction perpendicular thereto is conductive. It is a rectangular shape of about 11.6 mm which is larger than the width of the connecting member 6. In addition, the edge of the substrate 15 in the contour region of the auxiliary films 63c, 63c, 63c, 63c is separated from the edge of the substrate 15 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary film 63c has a substantially symmetrical shape with respect to the corresponding bus bar electrode 23b, that is, the conductive connecting member 6 to be installed, that is, with respect to the center line along the longitudinal direction thereof, and the bus bar electrode 23b, That is, the center line of the conductive connection member 6 to be installed substantially coincides with the center line of the auxiliary film 63c.

  In this case, the same effect as the first embodiment can be obtained.

  As shown in FIG. 12, a plurality of linear connecting lines 632c parallel to each other as auxiliary films 63c in the direction parallel to the bus bar electrodes 23b and connecting lines 633c on the contour may be provided. The widths of 632c and 633c are larger than the width of the finger electrode 23a and are 100 μm narrower than the connecting line 631c, and the interval between the connecting lines 632c is 1 mm.

(Sixth embodiment)
A solar cell module according to a sixth embodiment of the invention will be described. FIG. 13 is a top view of the auxiliary film according to the sixth embodiment.

  The difference from the first embodiment is the shape of the auxiliary film of the back-side electrode, and the others are the same as in the first embodiment, and the same parts are omitted from description, and the same or similar parts in FIG. 13 are the same. Differences from the first embodiment will be described with reference numerals.

  As shown in FIG. 13, the auxiliary film 73c of the back-side electrode 23 has a triangular upper surface contour having a bottom side on the end side so that the end side of the substrate 15 is wide.

  The auxiliary films 73c, 73c, 73c, 73c have a size (contour area) in which the length in the longitudinal direction (the height of the triangle) is 10 mm larger than the width of the conductive connecting member 6, and the direction perpendicular thereto. The length (the base of the triangle) is a rectangular shape having a length of 20 mm, which is larger than the width of the conductive connecting member 6. In addition, the edge of the substrate 15 in the contour region of the auxiliary films 63c, 63c, 63c, 63c is separated from the edge of the substrate 15 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary film 73c has a substantially symmetrical shape with respect to the corresponding bus bar electrode 23b, that is, the conductive connecting member 6 to be installed, that is, with respect to the center line along the longitudinal direction thereof, and the bus bar electrode 23b, That is, the center line of the conductive connection member 6 to be installed substantially coincides with the center line of the auxiliary film 73c.

  The auxiliary films 73 c, 73 c, 73 c, and 73 c of the present embodiment have a wider portion on the end side of the substrate 15 (width of the contour region) than the conductive connection member 6.

  In this embodiment, the same effect as that of the first embodiment can be obtained.

In the case of this embodiment, the length of the connecting line 731c of the auxiliary film 73c on the end side of the substrate 15 that is greatly affected by the expansion and contraction of the conductive connection member 6 due to the temperature change in the manufacturing process is long. While reducing the material of the auxiliary film 73c, it is possible to reduce the cracking of the substrate of the solar battery cell due to the expansion and contraction of the conductive connection member 6 due to the temperature change in the manufacturing process.
(Seventh embodiment)
A solar cell module according to a seventh embodiment of the invention will be described. FIG. 14 is a top view of the auxiliary film according to the seventh embodiment.

  The difference from the first embodiment is the shape of the auxiliary film of the back side electrode, and the others are the same as those of the first embodiment, and the same parts are omitted from description, and the same or similar parts in FIG. 14 are the same. Differences from the first embodiment will be described with reference numerals.

  As shown in FIG. 14, the auxiliary film 83 c of the back electrode 23 has a rectangular shape on the end side so that the end side of the substrate 15 is wide, and has an upper surface contour that is substantially arc-shaped on the opposite side to the end. .

  The auxiliary films 83c, 83c, 83c, 83c have a size (contour area) of 10 mm larger than the width of the conductive connecting member 6 in the longitudinal direction, and the length in the direction orthogonal thereto is the conductive connecting member. It is a rectangular shape of 20 mm larger than the width of 6. Note that the edge of the substrate 15 in the contour region of the auxiliary films 83c, 83c, 83c, 83c is separated from the edge of the substrate 15 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary film 83c has a substantially symmetrical shape with respect to the corresponding bus bar electrode 23b, that is, the conductive connecting member 6 to be installed, that is, with respect to the center line along the longitudinal direction thereof, and the bus bar electrode 23b, That is, the center line of the conductive connection member 6 to be installed substantially coincides with the center line of the auxiliary film 83c.

  The auxiliary films 83 c, 83 c, 83 c, 83 c of the present embodiment have a wider width than the conductive connecting member 6 on the end side of the substrate 15 (width of the contour region).

In the present embodiment, the same effect as in the sixth embodiment can be obtained.
(Eighth embodiment)
A solar cell module according to an eighth embodiment of the invention will be described. FIG. 15A is a top view of the solar battery cell used in the solar battery module, FIG. 15B is a back view of the solar battery cell, and FIG. It is a back view of a battery cell. The shape, size, and position of the contour region of the auxiliary membrane are the same.

  The difference from the first embodiment is that the bus bar electrode of the front electrode 22 and the bus bar electrode of the back electrode 23 of the solar battery cell 5 are non-linear and narrow, and the saw blade has a width less than twice that of the finger electrodes 22a and 23a. The other points are the same as in the first embodiment, and the same parts and similar parts are not described. In FIG. 15, the same or similar parts are denoted by the same reference numerals, and the first embodiment is omitted. Differences from the above will be described.

  As shown in FIGS. 15A and 15B, the bus bar electrodes 221b and 221b of the front side electrode 22 and the bus bar electrodes 231b and 231b of the back side electrode 23 have a non-linear width and a sawtooth structure.

  The longitudinal connecting lines 231c, 231c, ... of the auxiliary films 23c, 23c, 23c, 23c, and the connecting lines 232c, 232c, ... made of the conductive material in a direction orthogonal to the longitudinal direction. Is narrower than the connecting member 6 and wider than the finger electrode 23a.

  The auxiliary film 23c has a substantially symmetrical shape with respect to the corresponding bus bar electrode 231b, that is, the conductive connecting member 6 to be installed, that is, with respect to its center line along the longitudinal direction thereof, and the bus bar electrode 231b, That is, the center line of the conductive connection member 6 to be installed substantially coincides with the center line of the auxiliary film 23c.

In this embodiment, since the area width W of the bus bar electrodes 221b and 221b of the front electrode 22 and the bus bar electrodes 231b and 231b of the back electrode 23 is larger than the width of the conductive connection member 6, the conductive connection member 6 is connected. The conductive connecting member 6 can be connected with a high yield without increasing the manufacturing accuracy.

In the present embodiment, the bus bar electrodes 221b and 221b of the front side electrode 22 and the bus bar electrodes 231b and 231b of the back side electrode 23 are narrow, so that the stress applied to the solar cell 5 at the time of manufacture is smaller than that of the wide bus bar electrode. Can be reduced. .
(Ninth embodiment)
A solar cell module according to a ninth embodiment of the invention will be described. FIG. 16 (a) is a top view of a solar battery cell used in the solar battery module, FIG. 16 (b) is a back view of the solar battery cell, and FIG. 16 (c) is the solar battery connected to a conductive connecting member. It is a back view of a battery cell.

  The difference from the first embodiment is that the solar battery cell 5 has a bus bar-less structure that does not include a bus bar electrode, and the other parts are the same as those of the first embodiment, and the same parts and similar parts are not described. In FIG. 16, the same or similar parts are denoted by the same reference numerals, and differences from the first embodiment will be described.

  As shown in FIGS. 16A and 16B, neither the front-side electrode 22 nor the back-side electrode 23 has a bus bar electrode.

  As shown in FIG. 16 (c), the auxiliary films 23c, 23c, 23c, 23c are linear connecting lines 231c, 231c,... In the longitudinal direction and straight lines made of the conductive material in the direction perpendicular to the longitudinal direction. The connecting lines 232c, 232c,... Are narrower than the connecting member 6 and wider than the finger electrodes 23a.

  The auxiliary film 23c has a substantially symmetrical shape with respect to the conductive connecting member 6 to be installed, that is, with respect to the center line along the longitudinal direction thereof. The center line substantially coincides with the center line of the auxiliary film 23c.

In this embodiment, the same effect as that of the first embodiment can be obtained.
(10th Embodiment)
A solar cell module according to the tenth embodiment of the invention will be described. FIG. 17A is a top view of a solar battery cell in the solar battery module according to this embodiment, FIG. 17B is a back view of the solar battery cell, and FIG. 17C is the solar battery. The top view of the said photovoltaic cell for demonstrating the connection of a cell and an electroconductive connection member, FIG. 18 is sectional drawing of the said photovoltaic cell along AA 'in FIG.17 (c).

  The difference from the first embodiment is that the solar battery cell 5 is a single-sided light receiving type, the front electrode includes an auxiliary film, and the structure of the back electrode is different. Others are the same as those in the first embodiment, and the description of the same parts and similar parts is omitted. In FIGS. 17 and 18, the same or similar parts are denoted by the same reference numerals and are different from the first embodiment. Will be described.

  Referring to FIGS. 17 and 18, the solar cells 5, 5,... Are, for example, phosphorous on the surface side having a p-type polycrystalline silicon substrate 95 and the textured surface of the p-type polycrystalline silicon substrate 95. Is formed on the n-type diffusion layer 96 so that the front-side electrode 97 is exposed. An antireflection film 98 made of a silicon nitride film or a silicon oxide film having a film thickness of, for example, 60 nm, and an aluminum film metal film 99a having a film thickness of about several μm to several mm formed over substantially the entire back surface of the substrate 95. And a back-side electrode 99 formed of two bus bar electrodes 99b and 99b having a width of 300 μm and a thickness of 30 μm mainly made of silver and formed on this film.

  The front-side electrode 97 is made of a conductive material, for example, mainly made of silver, and a plurality of narrow linear finger electrodes 97a arranged in parallel to each other so as to cover substantially the entire surface of the n-type diffusion layer 96. 97a, two parallel straight (band-shaped) bus bar electrodes 97b, 97b connected so as to be substantially orthogonal thereto, and both ends in the longitudinal direction of the bus bar electrodes 97b, 97b, that is, the above-mentioned An auxiliary film 97c similar to the auxiliary film of the first embodiment configured to cover a predetermined region on the end side of the surface of the substrate 15 and to expose the n-type diffusion layer 96 on the predetermined region at a plurality of locations. 97c, 97c, 97c.

  The sizes (contour areas) of the auxiliary films 97c, 97c, 97c, and 97c are the same as the outline of the predetermined area, and the length in the longitudinal direction is 10 mm larger than the width of the conductive connecting member 6, The length in the orthogonal direction is a rectangular shape of 20 mm larger than the width of the conductive connecting member 6. The end side of the substrate 50 in the outline of the auxiliary films 97c, 97c, 97c, and 97c is separated from the end of the substrate 50 by about 1 mm or less, for example, about 0.5 mm.

  The auxiliary films 97c, 97c, 97c, 97c are linear connecting lines 971c, 971c,... Made of the conductive material in the longitudinal direction and linear connecting lines made of the conductive material in a direction orthogonal to the longitudinal direction. 972c, 972c,..., Having a large number of square openings 974c, 974c,..., And a plurality of square openings 974c, 974c. Are arranged regularly and have the same size and shape.

  The auxiliary films 97c, 97c, 97c, and 97c have a connecting line 974c at the contour position to further improve the adhesion strength.

  The finger electrodes 97a, 97a,..., The bus bar electrodes 97b, 97b, and the auxiliary films 97c, 97c, 97c, 97c are integrated so as to be electrically connected to each other. Has been.

  The auxiliary film 97c has a substantially symmetrical shape with respect to the bus bar electrode 97b, that is, the conductive connecting member 6 to be installed, that is, with respect to its center line along the longitudinal direction thereof. The center line of the conductive connecting member 6 is substantially coincident with the center line of the auxiliary film 97c.

  In the present embodiment, the auxiliary film 97c is directly connected to the bus bar electrode 97b, and is also directly connected to part of the finger electrodes 97a, 97a.

  In the present embodiment, the finger electrode 97a has a thickness of 10 to 30 μm, for example, 15 μm, a width of 50 to 200 μm, preferably 60 to 120 μm, for example, a 90 μm thin wire electrode, and at 2 mm intervals. Has been placed.

  The bus bar electrode 97b is a linear electrode having a thickness of 10 to 30 μm, for example, 15 μm, a width of 0.1 to 1.8 mm, preferably 0.1 to 0.3 mm, for example, 0.3 mm.

The auxiliary film 97c has a thickness of 10 to 30 μm, for example, 15 μm,
The linear connecting lines 971c, 972c, and 973c are narrower than the connection member 6 and wider than the finger electrode 97a. The linear connecting lines 971c, 972c, and 973c are narrower than the bus bar electrode 97b.

  The width and interval of the linear connecting line 971c in the longitudinal direction are, for example, 1 mm, and the width and interval of the linear connecting line 522c in the direction orthogonal to the longitudinal direction are, for example, 0.3 mm.

  In this embodiment, adjacent solar cells 5, 5,... Are bus bar electrodes 97 b and 97 b of the front side electrode 97 of one solar cell 5 and bus bar electrodes 99 b of the back side electrode 99 of the other solar cell 5. 99b are electrically connected by conductive connecting members 6 and 6, and the conductive connecting members 6 and 6 are fixed by melting and solidifying using solder as an adhesive 24 made of solder. .

In this embodiment, since the back-side electrode 99 is composed of a solid film, cracks in the substrate of the solar battery cell 5 due to expansion and contraction of the conductive connection member 6 due to temperature changes in the manufacturing process can be reduced. Since 97c, 97c, 97c, 97c can cover a predetermined area of a wide area (wide, vertically long) on the surface side of the substrate 95, the sun due to expansion and contraction of the conductive connection member 6 due to temperature change in the manufacturing process Since the cracks of the substrate of the battery cell can be further reduced and the auxiliary films 97c, 97c, 97c, 97c have a portion where the film does not exist (non-film portion) even if the area is increased as described above, The stress can be reduced, and the front electrode 97 can be prevented from peeling off.
(Eleventh embodiment)
A solar cell module according to the eleventh embodiment of the present invention will be described. FIG. 19 (a) is a top view of the solar battery cell in the solar battery module according to the present embodiment, FIG. 19 (b) is a back view of the solar battery cell, and FIG. 19 (c) is the solar battery. It is a top view of the said photovoltaic cell for demonstrating the connection of a cell and an electroconductive connection member.

  The difference from the tenth embodiment is that the front-side electrode 97 of the solar battery cell 5 has a bus bar-less structure, and the other parts are the same as those of the tenth embodiment, and the description of the same and similar parts is omitted. The same or similar parts are denoted by the same reference numerals, and differences from the tenth embodiment will be described.

  As shown in FIG. 19, the front electrode 97 does not have a bus bar electrode.

  The longitudinal connecting lines 971c, 971c, ... of the auxiliary films 97c, 97c, 97c, 97c, and the connecting lines 972c, 972c, ... made of the conductive material in a direction orthogonal to the longitudinal direction. Is narrower than the connecting member 6 and wider than the finger electrode 97a.

  The auxiliary membrane 97c has a substantially symmetric shape with respect to the conductive connecting member 6 to be installed, that is, with respect to the center line along the longitudinal direction thereof, and the center line of the conductive connecting member 6 to be installed is , Substantially coincides with the center line of the auxiliary film 97c.

  In this embodiment, the same effect as that of the tenth embodiment can be obtained.

  In the first to eighth embodiments, in consideration of light-shielding loss, auxiliary films are provided on both ends of the substrate of the back-side electrode that is opposite to the light-receiving side, but this configuration is replaced. In addition, an auxiliary film may be provided on both ends of the front side electrode on the substrate end side in consideration of the influence of light shielding loss.

  Since the semiconductor substrate of the solar battery cell is thinner than 1 mm, it is effective to reduce substrate cracking either on the front side electrode or the back side electrode on the end side of the substrate.

  Furthermore, an auxiliary film may be provided on both ends of the substrate of the front electrode and on both ends of the substrate of the back electrode.

  In the above description, the auxiliary films are provided on both ends of the substrate. When the auxiliary film is provided on either one, the end side of the substrate on the side where the connecting member is connected to the adjacent solar battery cell is preferable.

  Further, the solar cell module of the first embodiment in which the front side cover is made of a glass substrate and the back side cover is made of a resin sheet having rigidity lower than that of the glass substrate, etc. In this case, in the manufacturing process, since the connecting member on the cover side having low rigidity is easy to move, it is more preferable to provide an auxiliary film on the main surface side electrode on the cover side having low rigidity.

  The auxiliary film is not limited to an electrode material, and a material such as a resin can be used as appropriate.

  In the above embodiment, the contour shape of the auxiliary membrane is a square, a triangle, or the like, but is not limited to these shapes, and may be various shapes such as a trapezoid.

  In the said embodiment, although demonstrated using what is called a HIT photovoltaic cell and a polycrystalline solar cell, this invention can be utilized suitably for various photovoltaic cells, such as a single crystal photovoltaic cell.

  Moreover, in the said embodiment, although the electroconductive connection member was connected with the adhesive agent which consists of resin on a front side electrode and a back side electrode, you may connect by fusion | melting, such as solders, such as Sn-Ag-Cu, and solidification.

  Furthermore, the solar cell module of the present invention is not limited to the above-described embodiment, and may be, for example, a configuration without a frame, or may be a double-sided light-receiving solar cell module. The back cover may be a glass plate.

  In each of the above embodiments, the number of front-side electrode bus bar electrodes and back-side electrode bus bar electrodes may be changed as appropriate, for example, three bus bar electrodes.

  Moreover, the connection by the electroconductive connection member between adjacent photovoltaic cells is not restricted to the said embodiment, For example, a structure like FIG. 20 may be sufficient. In FIG. 20, the same or similar parts as those in the first embodiment are denoted by the same reference numerals.

DESCRIPTION OF SYMBOLS 1 Solar cell module 5 Solar cell 6 Conductive connection member 15 for connection Single crystal silicon substrate (semiconductor substrate)
95 Polycrystalline silicon substrate (semiconductor substrate)
22, 97 Front side electrode (Main surface side electrode)
22a, 97a Finger electrodes 22b, 97b, 221b Bus bar electrodes 23, 99 Back side electrode (main surface side electrode)
23a, 99a Finger electrodes 23b, 99b, 231b Bus bar electrodes 23c, 33c, 43c, 53c, 63c, 73c, 83c, 97c Auxiliary membrane

Claims (8)

A semiconductor substrate, the one main surface side electrode formed on one main surface of the semiconductor substrate, and the other main surface side electrode formed on the other main surface of the semiconductor substrate, A solar cell provided with a conductive connecting member for connection on one main surface side electrode and the other main surface side electrode,
An auxiliary film is provided on the end side of the semiconductor substrate,
The auxiliary membrane has a portion whose contour region is wider than the width of the conductive connecting member for connection provided on the end side, and the auxiliary membrane has a portion where the auxiliary membrane does not exist in the contour region. A solar battery cell characterized by that.   The solar cell according to claim 1, wherein the portion where the auxiliary film does not exist in the contour region is an opening of the auxiliary film.   The solar cell according to claim 1, wherein the auxiliary film has a mesh structure.   The solar cell according to claim 1, wherein the auxiliary film is composed of a plurality of strip-shaped films.   The solar cell according to any one of claims 1 to 4, wherein the one main surface side electrode includes a plurality of finger electrodes.   The solar cell according to claim 1, wherein the one main surface electrode includes a bus bar electrode.   The solar cell according to any one of claims 1 to 6, wherein the bus bar electrode has a non-linear shape.   A solar cell module comprising the solar cell according to claim 1.

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