JP5423105B2 - Solar cell, solar cell module and solar cell system - Google Patents

Description

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

  Solar cell systems equipped with solar cells are expected as new energy conversion systems because they convert light from the sun into electricity, and in recent years they are also widely used as power sources for general households and large-scale power plants. Is being promoted.

  Under such circumstances, at present, research and development for cost reduction are actively performed for further spread of the solar cell system.

  A conventional solar cell system includes, for example, one or a plurality of solar cell modules, and the solar cell module includes a plurality of solar cells that are electrically connected in series.

  In a conventional solar cell module, generally, between the surface electrode of one solar cell and the back electrode of the other solar cell of adjacent solar cells via solder or the like by a conductive connecting member such as copper foil. Connected.

  In the solar cell, for example, the surface electrode includes a plurality of finger electrodes which are a plurality of narrow electrodes formed in a substantially entire region of the surface of the solar cell (on the upper surface of the semiconductor substrate). It is composed of a wide bus bar electrode connected to the finger electrode, and the back electrode is formed of a plurality of narrow electrodes formed in a substantially entire area of the back surface of the solar battery cell (on the bottom surface of the semiconductor substrate). There are a finger electrode which is an electrode and a wide bus bar electrode connected to the finger electrode, and a metal film formed on the substantially entire surface. In particular, in the case of a double-sided light-receiving solar cell, a cell composed of the above finger electrodes and bus bar electrodes may be employed.

  Recently, the conductivity of a conductive connecting member such as a copper foil between a surface electrode of one solar cell and a back electrode of the other solar cell of adjacent solar cells in a solar cell module is made of resin. It has been proposed to use an adhesive (see, for example, Patent Document 1).

  Patent Document 1 discloses a resin containing conductive particles or insulating particles as the adhesive, and the bus bar electrode is electrically conductive to ensure sufficient electrical connection with the conductive connection member. It is wide so that it can be sufficiently opposed to the conductive connecting member through a conductive adhesive.

JP 2008-147567 A

  However, in the case of using an adhesive made of the resin as described above, the front electrode and the back electrode are more preferable as an electrical connection that bites into the conductive connection member, but in order to bite into the conductive connection member However, it is necessary to increase the pressure of the conductive connecting member on the wide bus bar electrode. As a result, there is a problem that the solar cell is easily cracked and the manufacturing yield is deteriorated.

  Even when the surface of the conductive connection member or the surface of the bus bar electrode has irregularities, the bus bar electrode is wide, so that the portions where the conductive connection member and the bus bar electrode are in contact with each other are distributed in a large or wide range. Therefore, the same problem arises.

  Further, the conventional wide bus bar electrode needs to use a large amount of electrode material, and there is a problem that the cost is increased.

  The present invention has been made in view of the above problems, and provides a solar battery cell, a solar battery module, and a solar battery system capable of achieving good electrical connection and cost reduction.

A solar cell module according to the present invention is a solar cell module comprising a plurality of solar cells and a conductive connection member for electrically connecting the plurality of solar cells,
The solar battery cell includes one electrode having a plurality of first thin wire electrodes and at least one second thin wire electrode configured to cross the plurality of first thin wire electrodes, and the other The conductive connection member is bonded to the solar cell by an adhesive made of resin so that the one electrode of the solar cell bites into the conductive connection member. And

  In the solar cell module according to the present invention, the one electrode has the first fine wire electrode and the second fine wire electrode, and the first and second fine wire electrodes are fine wire, At least one of the first and second thin wire electrodes can be satisfactorily bite into the conductive connection member, and a good electrical connection and cost reduction are possible.

  The adhesive may include a conductive material such as conductive particles such as solder, Ni, and Ag, and may include a nonconductive material such as non-conductive particles such as SiO2. Both of them may be included, or both of them may not be included.

The conductive connection member includes a conductive soft layer on a surface thereof.
Since the conductive connecting member includes a conductive soft layer on the surface thereof, the one electrode is better bite into the conductive connecting member, and a better electrical connection is possible.

  An average height of the second fine wire electrode is larger than an average height of the first fine wire electrode. The average height is the average of the heights along the center line located at the center of each line width of the first thin wire electrode and the second thin wire electrode in the range corresponding to the conductive connecting member. Say.

  Since the average height of the second thin wire electrode is larger than the average height of the first thin wire electrode, the second thin wire electrode bites into the conductive connecting member and is better. Electrical connection is possible.

  The second fine wire electrode is characterized by biting into the conductive connecting member.

  The line width of the second thin line electrode is substantially the same as the line width of the first thin line electrode.

    For example, the absolute value of the difference between the line width of the second thin line electrode and the line width of the first thin line electrode is within 50 μm.

Since the line width of the second thin line electrode is substantially the same as the line width of the first thin line electrode,
For example, it can be easily formed by a screen printing method.

  The second fine wire electrode is non-linear.

  Since the second thin wire electrode is non-linear, the portion where the second thin wire electrode and the conductive connecting member are in contact with each other increases, so that a good space between the one electrode and the connecting member is obtained. In addition to obtaining an electrical connection and increasing the number of contact portions in this way, the external force is dispersed, so the reliability of the mechanical connection is increased. Moreover, since the precision at the time of arrangement | positioning on the said 2nd fine wire electrode of the said electroconductive connection member can be made low, manufacturing time can be reduced and manufacturing cost can be held down.

  The width W of the second thin wire electrode is larger than the width of the conductive connection member.

  Since the width W of the second thin wire electrode is larger than the width of the conductive connecting member, the accuracy in arranging the conductive connecting member on the second thin wire electrode can be reduced. Time can be reduced and manufacturing costs can be reduced.

  The solar battery cell according to the present invention is electrically connected to another solar battery cell by a conductive connecting member, and the solar battery cell and the other solar battery by an adhesive made of resin. A solar battery cell bonded to a cell, wherein the solar battery cell is formed such that a plurality of first fine wire electrodes and the plurality of first fine wire electrodes intersect with each other. One electrode having the thin wire electrode and the other electrode are provided.

  In the solar cell according to the present invention, the one electrode has the first fine wire electrode and the second fine wire electrode, and the first and second fine wire electrodes are fine wire, At least one of the first and second thin wire electrodes can be satisfactorily bite into the conductive connection member, and a good electrical connection and cost reduction are possible.

  The solar cell system according to the present invention includes the above solar cell module.

  In the solar cell system according to the present invention, the one electrode has the first fine wire electrode and the second fine wire electrode, and the first and second fine wire electrodes are fine wire, At least one of the first and second thin wire electrodes can be satisfactorily bite into the conductive connection member, and a good electrical connection and cost reduction are possible.

  The other electrode may include a plurality of first thin wire electrodes and at least one second thin wire electrode configured to cross the plurality of first thin wire electrodes, respectively.

  The shape of the second fine wire electrode of the one electrode and the shape of the second fine wire electrode of the other electrode may be symmetrical. Further, the shape of the second fine wire electrode of the one electrode and the shape of the second fine wire electrode of the other electrode are reversed when viewed from the upper side of the upper surface of the semiconductor substrate in the vertical direction. Relationship may be.

  The second fine wire electrode of the one electrode and the second fine wire electrode of the other electrode are disposed so as to face each other through a semiconductor substrate constituting a solar battery cell, and above the upper surface of the semiconductor substrate. When viewed in the vertical direction from the side, the shape may be different and have intersecting portions. At least one of the second fine wire electrode of the one electrode and the second fine wire electrode of the other electrode may be non-linear.

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 taken along A-A ′ of FIG. 1. 4A is a bottom view of the solar battery cell in the solar battery module of FIG. 1, and FIG. 4B is a back view of the solar battery cell. FIG. 5A is a front plan view for explaining the connection between the solar battery cell and the conductive connection member in the solar battery module according to the first embodiment of the present invention, and FIG. It is a partial schematic cross section along AA 'in (a). 6A is a schematic cross-sectional view of a part along BB ′ in FIG. 5A, and FIG. 6B is a part of CC ′ in FIG. 5A. It is a schematic cross section. FIG. 7A is a top view of the solar battery cell in the solar battery module according to the second embodiment of the present invention, and FIG. 7B is a bottom view of the solar battery cell in the solar battery module. FIG. 8A is a top view of a solar battery cell in the solar battery module according to the third embodiment of the present invention, and FIG. 8B is a bottom view of the solar battery cell in the solar battery module. FIG. 9A is a top view of the solar battery cell in the solar battery module according to the fourth embodiment of the present invention, and FIG. 9B is a bottom view of the solar battery cell in the solar battery module. FIG. 10A is a top view of the solar battery cell in the solar battery module according to the fifth embodiment of the present invention, and FIG. 10B is a bottom view of the solar battery cell in the solar battery module. FIG. 11A is a top view of a solar battery cell in the solar battery module according to the sixth embodiment of the present invention, and FIG. 11B is a bottom view of the solar battery cell in the solar battery module.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A solar cell module including a plurality of solar cells according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. 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, FIG. 3 is a partial cross-sectional view of the AA ′ cross section of FIG. 1, and FIG. The top view of the photovoltaic cell in the photovoltaic module of FIG. 1, FIG.4 (b) is a back view of the said photovoltaic cell, FIG.5 (a) demonstrates the connection of the said photovoltaic cell and an electroconductive connection member. 5 (b) is a schematic cross-sectional view of a part along AA ′ in FIG. 5 (a), and FIG. 6 (a) is a cross-sectional view along the line B- in FIG. 5 (a). FIG. 6B is a partial schematic cross-sectional view along B ′, and FIG. 6B is a partial schematic cross-sectional view along CC ′ in FIG.

  1 to 3, reference numeral 1 denotes a solar cell module, and the solar cell module 1 is made of a transparent surface side cover 2 such as white plate reinforced glass, and a weather resistance made of a resin film such as polyethylene terephthalate (PET). , And a plurality of solar cells 4, 4,... Disposed between the front surface cover 2 and the back surface cover 3 via the filler 7 have a thickness 20 as a conductive surface material. By strip-like conductive connecting members 5, 5,... Having a width of 0.8-2 mm and a thickness of 100-200 μm made of copper foil or the like whose surface is covered with a lead-free solder layer (flexible layer) of ˜40 μm It is comprised from the plate-shaped structure which consists of the linear solar cell group 6,6, ... electrically connected in series, and the metal frame 8 which consists of aluminum etc. which support this structure. .

  Each solar cell group 6, 6,... Is arranged in parallel with each other, and each predetermined adjacent solar cell group 6, so that all the solar cell groups 6, 6,. 6 by a strip-like conductive connecting member 9 made of a flat copper wire or the like, the surface of which is coated with a lead-free solder layer having a width of 6 mm and a thickness of 300 μm. The conductive connection members 5, 5, 5, 5,... On the other end side of other predetermined adjacent solar cell groups 6, 6 are surfaced with a lead-free solder layer having a width of 3 mm and a thickness of 300 μm. Are connected to the L-shaped conductive connecting members 10 and 11 made of a flat copper wire or the like coated with solder. With this configuration, the plurality of solar cells 4, 4,... Of the solar cell module 1 are arranged in a matrix.

  In the outermost solar cell groups 6, 6, the connecting members 5, 5,. Further, L-shaped connecting members (output extraction connecting members) 12 and 13 made of 300 μm thick solder-plated flat copper wire or the like are solder-connected.

  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).

  4 to 6, the solar battery cells 4, 4,... Have a plurality of narrow linear finger electrodes 40 a disposed on the surface so as to cover substantially the entire surface. 40a... And a plurality of narrow-side serrated busbar electrodes 40b, 40b connected to the front surface electrode 40, and a plurality of lines disposed on the back surface so as to cover the entire surface. .. And a back electrode 41 composed of two narrow serrated bus bar electrodes 41b and 41b connected to the finger electrodes 41a, 41a... In addition, the dotted line in FIG. 4 has shown the part by which the connection member 5 is arrange | positioned.

  The solar cells 4, 4,... Are, for example, an i-type amorphous silicon layer, a p-type or an n-type over almost the entire surface on the surface having the texture structure of an n-type single crystal silicon substrate. A conductive amorphous silicon layer and one transparent conductive film layer such as ITO as the cell surface are provided in this order, and the i-type amorphous silicon layer, the one conductive type, Is a solar cell having a so-called HIT structure having a photoelectric conversion part provided with an amorphous silicon layer of the reverse conductivity type and the other transparent conductive film layer such as ITO as the cell back surface in this order. No. 41 is produced by thermosetting a silver paste which is a thermosetting conductive paste using an epoxy resin as a binder and silver particles as a conductive substrate.

  And between adjacent solar cells 4, 4... Are between the bus bar electrodes 40b, 40b of the surface electrode 40 of one solar cell 4 and the bus bar electrodes 41b, 41b of the back electrode 41 of the other solar cell 4. For example, the conductive connection members 5 and 5 are mechanically and electrically connected to each other by a conductive adhesive 10 made of a resin containing epoxy resin and nickel particles that are conductive particles.

  The surface electrode 40 is configured such that the average height of the bus bar electrode 40b is higher than the average height of the finger electrode 40a, preferably 5 μm or more, and the width W of the bus bar electrode 40b is wider than the line width of the conductive connecting member 5. ing.

  In this embodiment, the finger electrodes 40a, 40a... Are set from a thickness (average height) of 20 to 60 μm, for example, 40 μm, and the line width Wf is set from 50 to 120 μm, preferably from 50 to 100 μm. For example, 90 μm thin line electrodes are arranged every 2 mm, and the bus bar electrodes 40 b and 40 b are set from a thickness (average height) of 20 to 80 μm, for example 50 μm, and the line width Wb is 50 to 200 μm, preferably 80 When the line width of the conductive connecting member 5 is 1 mm, for example, it is 1.4 mm.

  The back electrode 41 is configured such that the average height of the bus bar electrode 41b is higher than the average height of the finger electrode 41a, preferably about 5 μm or more, and the width W of the bus bar electrode 40b is wider than the line width of the conductive connecting member 5. ing.

  In this embodiment, the finger electrodes 41a, 41a,... Have a thickness (average height) set from 10 to 60 [mu] m, for example 25 [mu] m, and a line width Wf set from 50 to 150 [mu] m, for example, 120 [mu] m The electrodes are arranged at intervals of 1 mm, and the bus bar electrodes 41 b and 41 b are set from a thickness (average height) of 30 to 100 μm, for example, 30 μm, and the line width Wb is from 50 to 200 μm, preferably from 80 to 150 μm. For example, when the wire width is 120 μm and the width W is 1 to 2.5 mm, and the line width of the conductive connecting member 5 is 1 mm, the width is 1.4 mm, for example.

  The ratio Wf / Wb between the line width Wf of the finger electrodes 40a and 41a and the line width Wb of the bus bar electrodes 40b and 41b is 0.5 to 1.5, and preferably the line width of the finger electrodes 40a and 41a The difference between the line widths of the bus bar electrodes 40b and 41b is, for example, within 50 μm in absolute value.

  In addition, in the surface electrode 40, it is preferable to make the line width of the finger electrode 40a narrower in order to sufficiently enter light. In this case, in the formation by screen printing, it is preferable that the extending direction of the finger electrode 40a is the printing direction, and the line width of the bus bar electrode 40b is set to be the line width of the finger electrode 40a in order to prevent printing blur of the bus bar electrode 40b. The ratio Wf / Wb between the line width Wf of the finger electrode 40a and the line width Wb of the bus bar electrode 40b is preferably 0.5 or more and less than 1.

  In the present embodiment, the surface electrode 40 is formed by connecting narrow bus-line electrodes 40b and 40b having narrow widths to the above-mentioned flexible layers 5a and 5a of the conductive connection members 5 and 5 deeply in a large area. Since the average height of the electrode 40a is lower than that of the bus bar electrodes 40b and 40b, the biting state of the conductive connection members 5 and 5 into the flexible layers 5a and 5a is shallowly connected in most regions. The finger electrode 40a may be in contact with the conductive connecting members 5 and 5, or may be in a form that does not bite.

  In addition, the back electrode 41 is also connected to the above-described flexible layers 5a and 5a of the conductive connection members 5 and 5 by deeply biting in the most part in the narrow line-shaped bus bar electrodes 41b and 41b, and the finger electrode 41a Since the average height is lower than that of the bus bar electrodes 41b and 41b, the biting state of the conductive connecting members 5 and 5 into the above-described flexible layers 5a and 5a is shallowly connected in most regions. The finger electrode 41a may be in contact with the conductive connection members 5 and 5, or may be in a form that does not bite.

  As described above, the connecting members 5, 5,... Are adhesive 10 on the surfaces of the solar cells 4, 4,. In addition to being fixed by the connecting members 5, 10,..., The bus bar electrodes 40 b, 40 b, 41 b, 41 b can be well bitten into the connecting members 5, 5,. Is attached to the solar cells 4, 4... Electrically and mechanically well.

  In this embodiment, since the width W of the bus bar electrodes 40b and 40b and the width W of the bus bar electrodes 41b and 41b are larger than the line width of the conductive connection member, the bus bar electrodes 40b and 40b, the bus bar electrode 41b, Since the accuracy in the arrangement of 41b may be low, manufacturing time can be reduced and manufacturing cost can be reduced.

  In the present embodiment, the front electrode 40 and the back electrode 41 are composed of narrow finger electrodes 40a and 41a having a narrow width and narrow bus bar electrodes 40b and 41b having a narrow width. Less.

  Furthermore, in this embodiment, since the bus bar electrodes 40b and 41b are narrow and narrow in addition to the finger electrodes 40a and 41a, the conductive connecting member is pressed against the bus bar electrode as compared with the conventional wide bus bar electrode. Without enlarging, it is possible to satisfactorily bite into the conductive connection member 5, and a good electrical connection between the front electrode 40, the back electrode 41 and the connection member 5 can be obtained.

  Further, since the bus bar electrodes 40b and 41b have a sawtooth shape, that is, a non-linear shape (non-linear shape), the connecting members 5 and 5 and the bus bar electrodes 40b and 41b are in contact with each other rather than the bus bar electrode having a thin linear shape. Since the number of portions increases, good electrical connection between the front surface electrode 40 and the back surface electrode 41 and the connection member 5 can be obtained. In addition to the increase in the contact portions, the external force is dispersed, so that the reliability of the mechanical connection is increased. Increases nature. Further, since the bus bar electrodes 40b and 41b are non-linear, the accuracy in arranging the bus bar electrodes 40b and 40b and the bus bar electrodes 41b and 41b of the conductive connection member 5 may be low, thereby reducing the manufacturing time. Manufacturing cost can be reduced.

  In this embodiment, since the average height of the bus bar electrodes 40b and 41b is higher than the average height of the finger electrodes 40a and 41a, the mechanical connection of the front electrode 40 and the back electrode 41 to the conductive connecting member is performed by the bus bar electrode. 40b and 41b become more dominant than the finger electrodes 40a and 41a.

  As a result, it is possible to better bite into the conductive connection member without increasing the pressure on the bus bar electrodes 40b and 41b of the conductive connection member 5 as compared with the conventional wide bus bar electrode. In addition to obtaining a good electrical connection between the back electrode 41 and the connection member 5, and when the number of finger electrodes 40a, 41a of the front electrode 40 and the back electrode 41 is different as in the present embodiment, The stress difference on the surface side can be reduced, cell cracking can be suppressed, and a good production yield can be achieved.

  Further, since the average height of the finger electrodes 40a and 41a is smaller than the average height of the bus bar electrodes 40b and 41b, the adhesive 10 is prevented from spreading along the finger electrodes as compared with the case where the average height of the finger electrodes is high. be able to.

In this embodiment, since the width W of the bus bar electrodes 40b and 40b and the width W of the bus bar electrodes 41b and 41b are larger than the line width of the conductive connecting member, even if the adhesive 10 spreads, the spread of the bus bar electrodes 40b and 40b increases. In the overhanging part, it can be pressed down into the part.
(Method for manufacturing solar cell module)
Below, the manufacturing method of the solar cell module which concerns on this embodiment is demonstrated.

  First, an epoxy thermosetting silver paste is printed on the transparent electrode film layer on the surface side of the solar battery cell 4 by screen printing and heated at 200 ° C. for 1 hour to completely cure the surface electrode 40. Form. Thereafter, similarly, an epoxy thermosetting silver paste is printed by screen printing on the transparent electrode film layer on the back surface side of the solar battery cell 4 and heated at 200 ° C. for 1 hour to completely cure the paste. A back electrode 41 is formed.

  In this embodiment, the width of the bus bar electrodes 40b and 41b is set larger than the width of the finger electrodes 40b and 41b so that the average height of the bus bar electrodes 40b and 41b is higher than the average height of the finger electrodes 40a and 41a. And the printing speed of the screen printing described above is controlled. Alternatively, screen printing may be performed twice using different printing plates so that the average height of the bus bar electrodes 40b and 41b is higher than the average height of the finger electrodes 40b and 41b.

  Next, a plurality of connecting members 5, 5,... Are prepared, and a solar cell adjacent to the cell 4 on the other surface and a portion facing the solar cell 4 on one surface of each connecting member 5. The adhesive 10 is applied to the portion facing the cell 4 using a dispenser so as to have a thickness of about 30 μm.

  Next, a plurality of solar cells 4, 4,... Are adjacent to one of the solar cells 4, 4. The bus bar electrode 40 b of the front surface electrode 40 and the back surface electrode 41 of the other solar cell 4. With the connecting members 5, 5,... Arranged so that the surface coated with the adhesive 10 faces the bus bar electrode 41 b, heat at 200 ° C. for 1 hour while applying pressure at about 2 MPa. The adhesive is cured to produce the solar cell group 6. In this heating process, pressure is applied so that the bus bar electrodes 40b, ..., 41b ... bite into the flexible layers 5a, 5a, ... of the connection members 5, 5, .... Here, in order to bond the solar cells 4, 4 and the connection member 5, the connection member 5 in which the adhesive 10 is formed is prepared, but the adhesive 10 is formed on the solar cell 4 by coating or the like. Alternatively, a film-like material may be prepared as the adhesive 10, which is disposed on the bus bar electrodes 40b,... 41b, and the connection members 5, 5,. You may heat and pressurize in a state.

  Next, after preparing a plurality of solar cell groups 6 and preparing a structure to which the connection members 9, 9, 9 and connection members 10, 11, 12, 13 are attached, the front 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, it is completely cured by heating at 150 ° C. for 1 hour.

Finally, the terminal box 14 and the metal frame 8 are attached to complete the solar cell module 1.
(Second Embodiment)
A solar cell module according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7A is a top view of a solar battery cell in the solar battery module according to this embodiment, and FIG. 7B is a bottom view of the solar battery cell.

  It is a top view. Note that differences from the first embodiment will be mainly described.

  Referring to FIG. 7, each of the solar cells 4, 4,... Has a plurality of narrow linear finger electrodes 40a, 40a,. And a plurality of narrow straight lines arranged on the back surface so as to cover substantially the entire surface surface, and having the surface electrode 40 composed of two narrow serrated bus bar electrodes 140b and 140b connected thereto. .. And a back electrode 41 composed of two narrow serrated bus bar electrodes 141b and 141b connected to the finger electrodes 41a, 41a.

  The second embodiment differs from the first embodiment in that the width W of the bus bar electrode 140b of the front electrode 40 is the same as or narrower than the line width of the conductive connection member 5, and the bus bar electrode 141b of the back electrode 41 The width W is the same as or narrower than the line width of the conductive connecting member 5.

  In the present embodiment, the bus bar electrodes 140b, 140b, 141b, and 141b are set from, for example, a width W 0.6 to 1 mm, and the others are the same as in the first embodiment.

In the present embodiment, as in the first embodiment, better electrical and mechanical connection and cell cracking can be suppressed than in the prior art. In particular, the electrode material can be reduced as compared with the first embodiment, and the portion where the connection members 5 and 5 and the bus bar electrodes 140b and 141b face each other is increased, so that better penetration into the conductive connection members 5 and 5 is possible. Thus, better electrical and mechanical connection between the front electrode 40 and the back electrode 41 and the connection member 5 can be obtained.
(Third embodiment)
A solar cell module according to a third embodiment of the present invention will be described with reference to FIG. FIG. 8A is a top view of a solar battery cell in the solar battery module according to this embodiment, and FIG. 8B is a bottom view of the solar battery cell. Note that differences from the first embodiment will be mainly described.

  Referring to FIG. 8, each of the solar cells 4, 4,... Has a plurality of narrow linear finger electrodes 40a, 40a,. And a plurality of narrow straight lines arranged on the back surface so as to cover substantially the entire surface surface, with the front surface electrode 40 comprising two narrow wave-shaped bus bar electrodes 240b and 240b connected thereto. .. And a back electrode 41 composed of two narrow corrugated bus bar electrodes 241b and 241b connected to the finger electrodes 41a, 41a.

In the present embodiment, the same effect as in the first embodiment can be obtained.
(Fourth embodiment)
The solar cell module according to the first embodiment of the present invention will be described with reference to FIG. FIG. 9A is a top view of a solar battery cell in the solar battery module according to this embodiment, and FIG. 9B is a bottom view of the solar battery cell. Note that differences from the first embodiment will be mainly described.

  Referring to FIG. 9, each of the solar cells 4, 4,... Has a plurality of narrow linear finger electrodes 40a, 40a,. And a plurality of narrow straight lines arranged on the back surface so as to cover substantially the entire surface, with the front surface electrode 40 composed of two narrow straight bus bar electrodes 340b and 340b connected thereto. .. And a back electrode 41 composed of two narrow linear bus bar electrodes 341b and 341b connected to the finger electrodes 41a, 41a.

As in the first embodiment, this embodiment can suppress electrical and mechanical connections and cell cracking better than those of the prior art. In particular, the electrode material can be reduced as compared with the first embodiment.
(Fifth embodiment)
A solar cell module according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 10A is a top view of the solar battery cell in the solar battery module according to this embodiment, and FIG. 10B is a bottom view of the solar battery cell. Note that differences from the first embodiment will be mainly described.

  Referring to FIG. 10, each of the solar cells 4, 4,... Has a plurality of narrow linear finger electrodes 40a, 40a,. A plurality of narrow linear bus bar electrodes 440b and 440b connected to this have two surface electrodes 40 and are arranged on the back surface so as to cover substantially the entire surface. .. And a back surface electrode 41 having two narrow linear bus bar electrodes 441b and 441b connected to the two linear finger electrodes 41a, 41a... ing.

As in the first embodiment, this embodiment can reduce the amount of electrode material as compared with the prior art, and can achieve good electrical and mechanical connection and cell cracking. In particular, better electrical and mechanical connection can be realized as compared with the fourth embodiment.
(Sixth embodiment)
A solar cell module according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 10A is a top view of the solar battery cell in the solar battery module according to this embodiment, and FIG. 10B is a bottom view of the solar battery cell. Note that differences from the first embodiment will be mainly described.

  The present embodiment is different from the first embodiment in that the front electrode 40 has three bus bar electrodes 40b, 40b, and 40b, and the back electrode 41 has three bus bar electrodes 41b, 41b, and 41b.

In addition to the same effects as those of the first embodiment, this embodiment has three bus bar electrodes each provided on the front surface and the back surface, so that the effect of increasing current collection efficiency can be obtained.
(Seventh embodiment)
Next, a solar cell system according to a seventh embodiment of the invention will be described.

  In the solar cell system of this embodiment, a plurality of the solar cell modules 1 of the first to sixth embodiments are fastened to the roof surface using fixing screws, for example, on the roof of a private house. A control system for engaging adjacent solar cell modules with each other and installing them in steps (in a staircase) from the water side (eave side) to the water side (building side) and controlling them. It is a solar cell system comprised by these.

  In the above-described solar cell system, for example, for a private house, the present invention is not limited to this, and the installation method of the solar cell module can be appropriately changed.

  The solar cells in the above embodiments have been described using so-called HIT solar cells. However, the solar cells can be used as appropriate for various solar cells such as single crystal solar cells and polycrystalline solar cells. In addition to the mold, it can be applied to a single-sided light receiving type.

  The polycrystalline solar battery cell or the single crystal solar battery includes, for example, an n + layer formed from a surface of a silicon substrate made of P-type polycrystal or P-type single crystal to a predetermined depth to form a pn junction, and the silicon substrate A solar cell in which a p + layer is formed from the back surface to a predetermined depth, a surface electrode 40 is formed on the n + layer, and a back electrode 41 is formed on the p + layer.

  Further, when both the front electrode bus bar electrode and the back electrode bus bar electrode are non-linear linear electrodes, the width W may be the same or different.

  Furthermore, in each of the above embodiments, both the front electrode and the back electrode are electrodes composed of finger electrodes and bus bar electrodes, but the shape of the front electrode and the back electrode may be different. The present invention can also be applied to an electrode having a finger electrode and a bus bar electrode and a back electrode having another structure, for example, an electrode covered with a metal film on the entire surface.

  Further, irregularities may be provided on the surface of the connecting member 5.

  Further, in each of the above embodiments, there are two or three bus bar electrodes for the front electrode and the back electrode, but the number may be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Solar cell module 4 Solar cell 5 Connection member 40 Front surface electrode 40a Finger electrode 40b, 140b, 240b, 340b Bus bar electrode 41 Back surface electrode 41a Finger electrode 41b, 141b, 241b, 341b Bus bar electrode

Claims (6)

A solar cell module comprising a plurality of solar cells and a conductive connection member for electrically connecting the plurality of solar cells,
The solar battery cell includes one electrode having a plurality of first thin wire electrodes and at least one second thin wire electrode configured to cross the plurality of first thin wire electrodes, and the other With electrodes,
The second fine wire electrode is non-linear,
The width W of the second thin wire electrode is larger than the width of the conductive connection member,
The said conductive connection member is adhere | attached with the adhesive agent which consists of this solar cell and resin so that the said 2nd fine wire electrode of the said photovoltaic cell may bite into this conductive connection member, The solar characterized by the above-mentioned. Battery module. The solar cell module according to claim 1, wherein the conductive connecting member includes a conductive soft layer on a surface thereof. 3. The solar cell module according to claim 1, wherein an average height of the second thin wire electrode is larger than an average height of the first thin wire electrode. 4. The sun according to claim 1, wherein a line width of the second thin line electrode is substantially the same as a line width of the first thin line electrode. 5. Battery module. The solar cell module according to any one of claims 1 to 4, wherein the first fine wire electrode is biting into the conductive connecting member shallower than the second fine wire electrode. The solar cell system provided with the solar cell module of any one of Claims 1-5.

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