Abstract:
[Problem] To provide a solar cell module that suppresses cell cracks. 
     [Solution] A solar cell module ( 13 ) is constituted to include a plurality of solar cells ( 2 ), which have one main surface side electrode ( 4 ) and another main surface side electrode ( 6 ), and conductive contact members ( 1 ) electrically connecting the one main surface side electrode ( 4 ) or the other main surface side electrode ( 6 ) of one solar cell ( 2 ) and the one main surface side electrode ( 4 ) or the other main surface side electrode ( 6 ) of another solar cell ( 2 ). The conductive contact members ( 1 ) have a first main surface having at least one protruding part ( 1   a ) and a second main surface having a flat surface ( 1   b ) on the side opposite the first main surface. The first main surface is affixed to the other main surface side electrode by an adhesive ( 12 ) formed from a resin, and the second main surface is affixed to the one main surface side electrode ( 4 ) by the adhesive ( 12 ) formed from a resin.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a solar cell module. 
       BACKGROUND 
       [0002]    Generally, solar cell modules are configured by electrically connecting a plurality of solar cells in series and/or parallel. 
         [0003]      FIG. 14  is a perspective view of a solar cell  101 ,  FIG. 15A  is a cross-section view for describing a connection between the solar cell  101  and a conductive connecting member  102 , and  FIG. 15B  is a cross-section view for describing a connection between the solar cell  101  and the conductive connecting member  102  in a solar cell module  100 . 
         [0004]    In the figures, the solar cell  101  contains a semiconductor substrate  107  with a pn junction, a reflection preventing film  108  and a front side electrode  109  formed on the front surface of the semiconductor substrate  107 , and a back surface side electrode  110  formed on the back surface of the semiconductor substrate  107 . 
         [0005]    The front surface side electrode  109  includes a plurality of finger shaped collecting electrodes  109   a  and two busbar electrodes  109   b  orthogonal to the collecting electrodes  109   a . The back surface side electrode  110  includes a metal film collecting electrode  110   a  and a busbar electrode  110   b.    
         [0006]    The busbar electrode  109   b  of one solar cell  101  and the BuSpar electrode  110   b  of an adjacent solar cell  101  are connected by the conductive connecting member  102 . 
       PRIOR TECHNOLOGY DOCUMENTS 
       [0007]    Patent document 1 Japanese Unexamined Patent Application 2009-54981 
       SUMMARY 
     Problem to be Resolved by the Invention 
       [0008]    Japanese Unexamined Patent Application 2009-54981 discloses a conductive connecting member covered by a substantially elliptical solder layer. 
         [0009]    With this conductive connecting member, if the opposing positions of the conductive connecting member on the front surface side of the solar cell and the conductive connecting member on the back surface side shift during the process of connecting the conductive connecting member and the solar cell, an undesirable stress will occur in the solar cell, and there is a possibility that the solar cell will crack. 
       Means for Resolving Problems 
       [0010]    The solar cell module of the present invention contains a plurality of solar cells having a first main surface side electrode and a second main surface side electrode, and a conductive connecting member that electrically connects either the first main surface side electrode or the second main surface side electrode of a first solar cell, and the first main surface side electrode or second main surface side electrode of a second solar cell; wherein the conductive connecting member has a first main surface with at least one convex part and a second main surface with a flat surface opposing the first main surface; the first main surface is attached by adhesive containing resin to the second main surface side electrode; and the second main surface is attached by adhesive containing resin to the first main surface side electrode. 
       Effect of the Invention 
       [0011]    The present invention provides a solar cell module that suppresses cracking of the solar cells. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  illustrates the structure of the conductive connecting member according to the first embodiment of the present invention; 
           [0013]      FIG. 2A  is a front surface side surface view of the solar cell according to the first embodiment of the present invention, and  FIG. 2B  is a back surface side surface view of the solar cell according to the first embodiment the present invention; 
           [0014]      FIG. 3  is a cross-section view along line A-A′ in  FIG. 2A  and  FIG. 2B ; 
           [0015]      FIG. 4  is a front surface side surface view for describing the connection between the solar cell and the conductive connecting member according to the first embodiment the present invention; 
           [0016]      FIG. 5  is a cross-section view along line A-A′ of  FIG. 4A , and is a diagram illustrating the configuration of the connection between the conductive connecting member and the busbar electrode; 
           [0017]      FIG. 6  is a cross-section view of the solar cell module according to the first embodiment of the present invention; 
           [0018]      FIG. 7  illustrates the structure of the conductive connecting member according to the second embodiment of the present invention; 
           [0019]      FIG. 8  is a cross-section view illustrating the configuration of the connection between the conductive connecting member and the busbar electrode according to the second embodiment of the present invention; 
           [0020]      FIG. 9  illustrates the structure of the conductive connecting member according to the third embodiment of the present invention; 
           [0021]      FIG. 10  is a cross-section view illustrating the configuration of the connection between the conductive connecting member and the busbar electrode according to the third embodiment of the present invention; 
           [0022]      FIG. 11  is a partial cross-section view of the solar cell module according to an embodiment of the present invention; 
           [0023]      FIG. 12  is a partial cross-section view of the solar cell module according to an embodiment of the present invention; 
           [0024]      FIG. 13  is a front surface side surface view for describing the solar cell module according to an embodiment of the present invention; 
           [0025]      FIG. 14  is a perspective view of a solar cell in a conventional solar cell module; and 
           [0026]      FIG. 15A  is a cross-section view for describing the connection between a conventional solar cell and the conductive connecting member, and  FIG. 15B  is a cross-section view for describing the connection between the solar cell and the conductive connecting member in a conventional solar cell module. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First embodiment 
       [0027]    The solar cell module according to the first embodiment the present invention is described below in detail all referring to the drawings. 
         [0028]    The conductive connecting member  1  for electrically connecting the solar cells of the solar cell module is described while referring to  FIG. 1 .  FIG. 1  is a perspective view of the conductive connecting member  1 . 
         [0029]    The conductive connecting member  1  is made of a belt shaped copper wire or a silver wire with a hexagonal cross-section, the upper surface side has a convex part  1   a  with a trapezoidal cross-section in the short direction that extends like a stripe in the long direction, and the lower surface side has a flat surface  1   b.    
         [0030]    The conductive connecting member  1  has a width Ws of 1 mm, and a thickness t of 250 μm. The convex part  1   a  has an upper surface width Wu of 0.2 mm, smaller than the width Ws, and the height h is 50 μm. Note that the conductive connecting member  1  is coated with conductive layer such as Ag or a solder such as a Sn—Ag—Cu alloy and the like, so as to cover the area of the conductive connecting member  1  so that the entire lower surface is flat. 
         [0031]    The solar cells that compose this solar cell module are described while referencing  FIG. 2  and  FIG. 3 .  FIG. 2A  is a front surface side surface view of the solar cell  2 ,  FIG. 2B  is a back surface side surface view, and  FIG. 3  is a cross-section view along line A-A′ in  FIG. 2 . 
         [0032]    In the figures,  2  represents a solar cell, where an i-type amorphous silicon layer  8  with a thickness of 5 nm to 20 nm, a p-type amorphous silicon layer  9  with a thickness of 5 nm to 20 nm, and a transparent electrode film layer  3  made of ITO or the like with a thickness of 70 μm to 100 nm are formed in order on the front surface of an n-type monocrystalline silicon substrate with a textured structure having a height of 5 to 10 μm. Furthermore, a front surface side electrode  4  is formed by hardening an Ag paste on the transparent electrode film layer  3 . 
         [0033]    Furthermore, an i-type amorphous silicon layer  10  with a thickness of 5 nm to 20 nm, a n-type amorphous silicon layer  11  with a thickness of 10 nm to 50 nm, and a transparent electrode film layer  5  made of ITO or the like with a thickness of 70 μm to 100 nm are formed in order on the back surface of an n-type monocrystalline silicon substrate  7  with a textured structure having a height of 5 to 10 μm. Furthermore, a back surface side electrode  6  is formed by hardening an Ag paste on the transparent electrode film layer  5 . 
         [0034]    The n-type monocrystalline silicon substrate  7  is essentially a square with approximately 100 mm side for example, and the thickness is 100 μm to 300 μm. 
         [0035]    Note that a configuration with reverse polarity to the solar cell  2  is acceptable, and in other words, a configuration where the n-type amorphous silicon layer is provided on the front surface side and the p-type amorphous silicon layer is provided on the back surface side is also acceptable. 
         [0036]    The front surface side electrode  4  includes a plurality of finger electrodes  4   a  and two busbar electrodes  4   b.    
         [0037]    The plurality of finger electrodes  4   a  are formed across essentially the entire front surface of the transparent electrode film layer  3 . The various finger electrodes  4   a  have a fine wire shape and are arranged to be mutually parallel. For example, the finger electrodes  4   a  have a thickness of 50 μm and a wire width of 50 μm, and are arranged with 2 mm intervals therebetween. 
         [0038]    The two busbar electrodes  4   b  are integrally configured to be connected orthogonal to the plurality of finger electrodes  4   a  on the surface of the transparent electrode film layer  3 . For example, the busbar electrode  4   b  has a linear shape with a thickness of 50 μm and a wire width of 200 μm. At this time, the wire width of the busbar electrode  4   b  is narrower than the lower surface width Ws of the conductive connecting member  1 . 
         [0039]    The back surface side electrode  6  includes a plurality of finger electrodes  6   a  and two busbar electrodes  6   b.    
         [0040]    With the present embodiment, the interval between adjacent finger electrodes  6   a  of the back surface side electrode  6  is formed to be narrower than the interval between adjacent finger electrodes  4   a  of the front surface side electrode  4 . 
         [0041]    The two busbar electrodes  6   b  are integrally configured to be connected to the plurality of finger electrodes  6   a  on the back surface of the transparent electrode film layer  5 . For example, the busbar electrode  4   b  has a thickness of 50 μm and a line width of 200 μm. At this time, the wire width of the busbar electrode  6   b  is wider than the upper surface width Wu of the conductive connecting member  1 . 
         [0042]    The connection between the solar cell  2  and the conductive connecting member  1  is described while referring to  FIG. 4  and  FIG. 5 .  FIG. 4  is a front surface side surface view for describing the connection between the solar cell  2  and the conductive connecting member  1 , and  FIG. 5  is a cross-section view along line A-A′ in  FIG. 4 . 
         [0043]    The busbar electrode  4   b  on the front surface side of one solar cell  2  is connected to the busbar electrode  6   b  on the back surface side of an adjacent solar cell  2  using an adhesive  12  containing a resin on each of the solar cells  2  in order to be electrically connected by the conductive connecting member  1 . 
         [0044]    The solar cell module  13  of the first embodiment is described while referring to  FIG. 6  and  FIG. 13 . 
         [0045]    The solar cell module  13  contains a transparent front surface side cover  14  made of white plate reinforced glass or the like; a weather resistant back surface side cover  15  made from a resin film such as polyethylene terephthalate (PET) or the like; a plate shaped component body with a solar cell group  18  containing a plurality of solar cells  2  electrically connected in series by a conductive connecting member  1  arranged in a filler material  16  such as ethylene vinyl acetate (EVA) or the like between the front surface side cover  14  and the back surface side cover  15 ; and a metal frame  17  made of aluminum or the like that supports the component bodies. 
         [0046]    The solar cell module  13  contains a solar cell group  18  where a plurality of solar cells  2  are connected in series by the conductive connecting member  1 . The solar cell group  18  is connected to an adjacent solar cell group  18  by connecting members  19 ,  20 . 
         [0047]    The outermost solar cell group  18  is electrically connected to an L-shaped connecting member (connecting member for receiving output)  21  for receiving electrical output from the solar cell module  13 . In this manner, the solar cell  2  is electrically connected to other solar cells  2  by the conductive connecting member  1 . 
         [0048]    The solar cell module  13  illustrated in  FIG. 13  is completed by the foregoing process. 
       Solar Cell Module Manufacturing Method 
       [0049]    The manufacturing method of the solar cell module of the present embodiment is described. Herein, as an example, a method is described where the front surface side electrode  4  and the back surface side electrode  6  are manufactured using a silver paste where silver fine powder was kneaded into a resin such as an epoxy resin. 
         [0050]    First, a solar cell  2  is prepared with a transparent electrode film layer  3 ,  5  on both surfaces. 
         [0051]    Next, conductive paste is printed by screenprinting onto the transparent electrode film layer  3  on the front surface side of the solar cell  2 , and after drying for 10 minutes at 150° C., conductive paste is printed by screenprinting or offset printing onto the transparent electrode film layer  3  [Translator&#39;s note: Probably should be film layer  5 ] on the back surface side of the solar cell. Next, drying is performed for 1 hour at 200° C. in order to completely harden the paste to form the front surface side electrode  4  and the back surface side electrode  6 . 
         [0052]    A plurality of solar cells  2  manufactured as described above are prepared along with a plurality of conductive connecting members  1 . 
         [0053]    Next, an adhesive  12  is provided between the flat part  1   b  of the lower surface side of each conductive connecting member  1  and the part facing the busbar electrode  4   b , and between the convex part  1   a  of the upper surface side of the conductive connecting member  1  and the part that faces the BuSpar electrode  6   b . For example, the adhesive  12  is an epoxy type thermoset resin that hard as when heated to approximately 200° C. For example, the adhesive  12  can be in the form of a film. 
         [0054]    The adhesive  12  is provided on the busbar electrode  4   b  on the first solar cell  2  of the adjacent solar cells  2  and on the busbar electrode  6   b  of the second solar cell  2 , a pressure of approximately 2 MPa is applied while heating for 30 seconds at 200° C. with the conductive connecting member  1  positioned on each of these adhesives  12 . 
         [0055]    Next, a structural body is manufactured by preparing a plurality of solar cell group  18 , and attaching to the outermost solar cell group  18  an L-shaped connecting member (connecting member for receiving output)  21  for receiving electrical output from the solar cell module  13 . Next, the front surface side cover  14 , sealing sheet that forms the filler material  16 , structural body, sealing sheet that forms the filler  16 , and the back surface side cover  15  R overlaid in order , and thermocompression bonded for 10 minutes at 150° C. in a vacuum. Next, the filler material  16  is completely hardened by heating for 1 hour at 150° C. 
         [0056]    Finally, a terminal box and metal frame are attached to complete the solar cell module  13 . 
         [0057]    The solar cell module  13  of the present embodiment has a stripe shaped convex part  1   a  on the upper surface side of the conductive connecting member  1 , and a flat surface  1   b  on the lower surface side. Therefore, the busbar electrode  4   b  on the front surface side of the solar cell  2  is connected to the flat surface  1   b  of the conductive connecting member  1 , and the busbar electrode  6   b  on the back surface side of the solar cell is connected to the convex part  1   a  of the conductive connecting member  1 . Therefore, even if shifting occurs between the connecting surface of the flat surface  1   b  of the busbar electrode  4   b  on the front surface side and the connecting surface of the convex part  1   a  of the busbar electrode  6   b  on the back surface side, the lower surface width Ws of the conductive connecting member  1  is wider than the upper surface width Wu, and therefore the flat surface  1   b  acts to disperse the stress on the convex part  1   a  that is applied in a first direction of the solar cell  2 . As a result, shear stress in the solar cell can be suppressed, and cracking of the solar cell  2  can be suppressed. 
         [0058]    Furthermore, with the solar cell module  13  of the present embodiment, a front surface side cover  14  made of a white plate reinforced glass or the like is used on the front surface side, and a weather resistant back surface side cover  15  made from a resin film such as polyethylene terephthalate (PET) and the like is used on the back surface side. With atypical solar cell module  13  of this configuration, a different level of stress is applied to the conductive connecting member  1  on the front surface side and the back surface side of the solar cell  2  by the materials that form the covers on the front surface side and the back surface side. 
         [0059]    With this solar cell module  13  configuration, the stress applied on the conductive connecting member  1  is higher on the back surface side of the solar cell  2  then the front surface side because the back surface side cover  15  is made from a material that is more flexible than the front surface side cover. Therefore, the busbar electrode  6   b  and the convex part  1   a  of the conductive connecting member  1  on the back surface side are connected while embedded in the adhesive  12 . Therefore, the contact area between the conductive connecting member  1  and the adhesive  12  is increased by embedding the convex part  1   a  in the adhesive  12 . As a result, the back surface side of the solar cell  2  and the conductive connecting member  1  are firmly connected, and the conductive connecting member  1  on the back surface side can be suppressed from separating from the solar cell  2  when forming the solar cell module  13 . 
         [0060]    With the manufacturing method of the present embodiment, cracking of the solar cell  2  can be suppressed when manufacturing the solar cell module. 
       Second Embodiment 
       [0061]    The solar cell module of the second embodiment of the present invention is described while referring to  FIG. 7  and  FIG. 8 .  FIG. 7  is a perspective view of the conductive connecting member  10  according to the second embodiment, and  FIG. 8  is a diagram illustrating the connection form between the conductive connecting member  10  and the busbar electrodes  4   b ,  6   b . Note that the differences to the first embodiment will primarily be described. Parts that are the same as the first embodiment are assigned the same code in  FIG. 7  and  FIG. 8 , and a description thereof is omitted. 
         [0062]    In reference to  FIG. 7 , the differences between the first embodiment and the second embodiment is that in the second embodiment, the conductive connecting member  10  has two convex parts  10   a  with a trapezoidal cross-section in the short direction and that extend mutually parallel in the form of a stripe in the long direction, on the upper surface side. The conductive connecting member  10  has a thickness t of 250 μm. The convex part  10   a  has an upper surface width Wu of 20 μm and a height h of 50 μm, and the flat surface  10   b  has a width Ws of 1 mm. The width of the sum of the upper surface widths of the two convex parts  10   a  is smaller than the width Ws of the flat surface  10   b.    
         [0063]    In reference to  FIG. 8 , with the present embodiment, the wire width of the busbar electrode  4   b  on the front surface side is narrower than the width Ws on the conductive connecting member  1 . Furthermore, the upper surface width Wu of the conductive connecting member  10  is narrower than the wire with of the busbar electrode  6   b  on the back surface side. 
         [0064]    With the present embodiment, the busbar electrode  4   b  on the front surface side of the solar cell  2  is connected to the flat surface  10   b  of the conductive connecting member  10 , and the busbar electrode  6   b  on the back surface side of the solar cell is connected to the two stripe shaped convex parts  10   a  of the conductive connecting member  10 . If the connecting surfaces of the connecting members on the front surface side and the back surface side of the solar cell  2  are shifted, the stress that was applied to the solar cell  2  that was a single stress because of the convex part  1   a  in the first embodiment is divided into two stresses by the two convex parts  10   a , and the divided stress can further be dispersed by the flat surface  10   b . As a result, shear stress in the solar cell  2  can be suppressed better than with the first embodiment, and cracking of the solar cell  2  can be suppressed. 
         [0065]    When forming the solar cell module  13 , the busbar electrode  6   b  and the two convex parts  10   a  of the conductive connecting member  10  on the back surface side are connected while embedded in the adhesive  12 . Therefore, the contact area between the conductive connecting member  10  and the adhesive  12  can be larger than the first embodiment by embedding the two convex parts  10   a  in the adhesive  12 . As a result, the back surface side of the solar cell  2  and the conductive connecting member  10  are firmly connected, and the conductive connecting member  1  on the back surface side can be better suppressed from separating from the solar cell  2  when forming the solar cell module  13 , as compared to the first embodiment. 
       Third Embodiment 
       [0066]    The solar cell module of the third embodiment of the present invention is described while referring to  FIG. 9  and  FIG. 10 .  FIG. 9  is a perspective view of the conductive connecting member  100  according to the third embodiment, and  FIG. 10  is a diagram illustrating the connection form between the conductive connecting member  100  and the busbar electrodes  4   b ,  6   b . Note that the differences to the second embodiment will primarily be described. Parts that are the same as the second embodiment are assigned the same code in  FIG. 9  and  FIG. 10 , and a description thereof is omitted. 
         [0067]    In reference to  FIG. 9 , the differences between the third embodiment and the second embodiment is that with the third embodiment, the conductive connecting member  100  has a plurality of convex parts with identical triangular cross-sections in the short direction periodically connected on the upper surface side, and a plurality of concave and convex parts  100   a  with a triangular shape that extend in parallel in the long direction. 
         [0068]    For example, the conductive connecting member  100  is a copper wire with a thickness t of 230 μm. Furthermore, the conductive connecting member  100  has a bottom edge width Wu of the triangular concave and convex parts  100   a  of 30 μm, and the width Ws of the flat surface  100   b  is 1 mm. 
         [0069]    Next, in reference to  FIG. 10 , with the present embodiment, the wire width of the busbar electrode  4   b  on the front surface side is narrower than the width Ws of the flat surface  100   b  on the conductive connecting member  1 . Furthermore, the wire width of the busbar electrode  6   b  on the back surface side is narrower than the sum of the upper surface widths Wu of the conductive connecting member  1 . Furthermore, the convex part on both ends of the conductive connecting member  100  has a configuration that is not exposed from the upper surface width Wu. 
         [0070]    With the present embodiment, the busbar electrode  4   b  on the front surface side of the solar cell  2  is connected to the flat surface  100   b  of the conductive connecting member  100 , and the busbar electrode  6   b  on the back surface side of the solar cell is connected to the plurality of triangular concave and convex parts  100   a  of the conductive connecting member  100 . If the connecting surfaces of the connecting members on the front surface side and the back surface side of the solar cell  2  are shifted, the stress that was applied to the solar cell  2  that was divided into two stresses by the convex parts  10   a , is further dispersed by the plurality of triangular concave and convex parts  100   a , and the divided stress can further be dispersed by the flat surface  100   b . As a result, shear stress in the solar cell  2  can be suppressed better than with the second embodiment, and cracking of the solar cell  2  can be suppressed. 
         [0071]    When forming the solar cell module  13 , the busbar electrode  6   b  and the plurality of triangular concave and convex parts  100   a  of the conductive connecting member  100  on the back surface side are connected while embedded in the adhesive  12 . Therefore, the contact area between the conductive connecting member  100  and the adhesive  12  can be larger than the second embodiment by embedding the plurality of concave and convex parts  100   a  in the adhesive  12 . As a result, the back surface side of the solar cell  2  and the conductive connecting member  100  are firmly connected, and the conductive connecting member  1  on the back surface side can be better suppressed from separating from the solar cell  2  when forming the solar cell module  13 , as compared to the second embodiment. 
         [0072]    Furthermore, with the present embodiment, of the light incident on the light receiving surface side, the light that reaches the plurality of triangular concave and convex parts  100   a  of the conductive connecting member  100  can be efficiently reflected. Therefore, more light will be re-reflected by the front surface side cover  14  illustrated in  FIG. 6  or the filler material  16 , and as a result, more light will enter the solar cell  2 , and the output of the solar cell  2  will be enhanced. 
         [0073]    Furthermore, with the present embodiment, the case where the busbar electrode on the front surface side of the solar cell and the busbar electrode on the back surface side of an adjacent solar cell are connected in series was described as an example, but the connection between adjacent solar cells is not restricted by the aforementioned embodiment. 
         [0074]    For example, the configurations of  FIG. 11  and  FIG. 12  are also possible. Note that in  FIG. 11  and  FIG. 12 , parts that are identical or similar to the aforementioned embodiments are assigned the same code. 
         [0075]    The solar cell module  13  illustrated in  FIG. 11  is configured such that two adjacent solar cells  2  having an element construction with the same polarity are arranged in a set, two adjacent solar cells  2  having an element construction with reverse polarity to the aforementioned solar cells are arranged in a set, and these sets are electrically connected in series by a conductive connecting member  11 . 
         [0076]    With the solar cell module  13  illustrated in  FIG. 12 , the adjacent solar cells  2  have an element construction with mutually reversed polarity , and the conductive connecting members  1  electrically connect in series the front surface side electrodes of adjacent solar cell  2  and the back surface side electrodes of the solar cells  2 . In this case, the lower surface of the conductive connecting member  1  with a flat surface and the front surface side electrode are connected, and the upper surface of the conductive connecting member  1  with at least one convex part is connected to the back surface side electrode. 
         [0077]    The solar cell modules of these embodiments have a configuration with a flat surface on the bottom surface side of the conductive connecting member, but it is also possible for the flat surface to have concave and convex shapes with a thickness less than that of at least one convex part provided on the upper surface side of the conductive connecting member, preferably less than the height of the texture structure, for example 10 μm or less. In this case, cracking of the solar cells can be suppressed similar to the other embodiments. 
         [0078]    Furthermore, the solar cell modules of the present invention can have a configuration with concave and convex shapes with a thickness less than that of at least one convex part provided on the upper surface side of the conductive connecting member, preferably less than the height of the texture structure, for example 10 μm or less, on the front surface side electrode and the back surface side electrode, similar to the flat surface on the lower surface side of the conductive connecting member. In this case, cracking of the solar cells can be suppressed similar to the other embodiments. 
         [0079]    Furthermore, the solar cell module of the present invention is not restricted to the aforementioned embodiments, and for example a configuration without a frame is also possible. 
         [0080]    Furthermore, the solar cell module of the present invention can be a double-sided light receiving solar cell module, and for example, both the front surface side cover and the back surface side cover can be glass plate. 
         [0081]    Furthermore, an insulating adhesive can be used as the adhesive  12 . Furthermore, the resin is not restricted to epoxy thermoset resins, and other resins can be appropriately used. 
         [0082]    Furthermore, the adhesive  12  made from resin may also contain conductive particles such as Ni or Ag or the like, or may contain a non-conductive material such as non-conductive particles like SiO2 and the like, or may contain both of these types of particles, or neither type of particle. 
         [0083]    The present invention is not restricted to the solar cell construction illustrated in  FIG. 3 , and can also be applied to various solar cells such as polycrystalline solar cells and the like. 
         [0084]    Note that the aforementioned embodiments are presented in order to aid in understanding of the present invention, and should not be interpreted as restricting the present invention. The present invention can be altered and improved without violating the gist of the invention, and the present invention includes these alternatives. 
       DESCRIPTION OF CODES 
       [0000]    
       
           1 ,  10 ,  100  conductive connecting member 
           1   a ,  10   a  convex part 
           100   a  concave and convex part 
           1   b ,  10   b ,  100   b  flat surface 
           2  solar cell 
           4  front surface side electrode 
           4   a  finger electrode 
           4   b  busbar electrode 
           6  back surface side electrode 
           6   a  finger electrode 
           6   b  busbar electrode 
           13  solar cell module