JP6047389B2 - Solar cell and method for manufacturing the same - Google Patents

Description

  The present invention relates to a solar cell that can be used for photovoltaic power generation and a method for manufacturing the solar cell.

  In recent years, development of clean energy sources has been desired due to problems of depletion of energy resources and global environmental issues such as an increase in carbon dioxide in the atmosphere. In particular, solar power generation using solar cells is a new energy source. Developed, put into practical use, and are on the path of development.

  As such a solar cell, conventionally, for example, a pn junction is formed by diffusing impurities of a conductivity type opposite to the silicon substrate on the light receiving surface of a single crystal or polycrystalline silicon substrate, and the light reception of the silicon substrate is performed. Solar cells formed by connecting a plurality of double-sided electrode type solar cells each having an electrode formed on the surface and the back surface are mainly used.

  In recent years, so-called back electrode type solar cells have been developed in which electrodes are not formed on the light receiving surface of a silicon substrate, but P electrodes and N electrodes are formed on the back surface thereof. In a back electrode type solar cell, since there is generally no electrode on the light receiving surface, there is no shadow loss due to the electrode, and a higher output than a solar cell having electrodes on the light receiving surface and the back surface of the silicon substrate can be obtained. There is expected.

  In addition, the use of a wiring board is adopted to facilitate the connection of the solar cells, and in the back electrode type solar battery cell, it is possible to connect using a wiring substrate in which wiring is formed on an insulating base material. Has been sought.

  In order to facilitate such electrical connection work, the solar cell and the wiring board are connected to each other by bonding the solar cell and the wiring board using an adhesive. A solar cell and a manufacturing method thereof have already been proposed (see, for example, Patent Document 1).

  In addition, the wiring board is formed by forming a desired wiring pattern on an insulating substrate, but a flexible film substrate such as a resin film is used in addition to the insulating substrate using a hard substrate. Some have already been proposed (see, for example, Patent Document 2).

JP 2009-88145 A JP 2010-16074 A

  However, the solar cell described in Patent Document 1 has a configuration in which an adhesive is filled and bonded between a solar battery cell and a wiring substrate in which a wiring pattern is formed on a flat insulating base material. The gap between the electrode non-formation region of the solar battery cell and the insulating base material has to be filled with a large amount of adhesive.

  Moreover, even if it is a board | substrate using the resin film described in patent document 2, when adhering a flat film board | substrate to a photovoltaic cell simply using an adhesive agent, the electrode non-contact of a photovoltaic cell is similarly applied. It is the same that it is necessary to fill a gap between the formation region and the substrate (insulating base material) with a large amount of adhesive.

  As described above, the configuration in which the solar battery cell and the wiring board are bonded using a large amount of adhesive causes a problem in that productivity is deteriorated. Therefore, it is desired that the solar cell can be bonded with a small amount of adhesive and has excellent productivity, and a method for manufacturing the solar cell.

  Therefore, in view of the above problems, the present invention provides a solar battery including a back electrode type solar battery cell and a wiring board, and a solar battery capable of joining the solar battery cell and the wiring board without using a large amount of adhesive, and the production thereof. It aims to provide a method.

  In order to achieve the above object, the present invention provides a back electrode type solar cell in which two types of electrodes having different polarities are provided on one surface of a substrate, and a wiring corresponding to the electrode on one surface of an insulating substrate. A wiring board, wherein the electrode of the back electrode type solar cell and the wiring of the wiring board are electrically connected, and the insulating base material is the back electrode type. It is characterized in that it is bent toward the solar cell side and a recess is formed between the adjacent electrodes of the back electrode type solar cell.

  According to this configuration, the insulating base material is bent toward the back electrode type solar battery cell to form a recess between the adjacent electrodes, so that the gap between the solar battery cell and the insulating base material is filled. The amount of adhesive used can be reduced. Moreover, the insulation between adjacent electrodes can also be ensured through this insulating substrate. That is, it is possible to obtain a solar battery that can join the solar battery cell and the wiring board without using a large amount of adhesive.

  Moreover, it is preferable that the hollow part of an insulating base material contacts a back electrode type solar cell between the electrodes which mutually adjoin a back electrode type solar cell.

  Moreover, it is preferable that the hollow part of an insulating base material contacts the side surface which the mutually adjacent wiring opposes.

  Further, the back electrode type solar cell and the wiring substrate are sealed with a sealing material, and the recess is filled with a sealing material, so that an insulating substrate is provided between wirings adjacent to each other on the wiring substrate. It is preferable that a sealing material exists through the material.

  The present invention also includes a back electrode type solar cell in which two types of electrodes having different polarities are provided on one surface of the substrate, and a wiring substrate in which wiring corresponding to the electrodes is provided on one surface of the insulating base material. A method for manufacturing a solar cell, wherein the back electrode solar cell is arranged on the wiring substrate so that the electrode of the back electrode solar cell and the wiring of the wiring substrate face each other. A step of stacking the light-transmitting substrate, the first sealing material, the wiring substrate on which the back electrode type solar cells are disposed, and a structure in which the second sealing material is stacked in this order; A base material bending step of bending the insulating base material of the wiring board to the back electrode type solar cell side, heating the structure, and the first sealing material and the second sealing material. Before the back electrode type solar cell is placed It is characterized in that it comprises a sealing step of sealing the wiring substrate. According to this configuration, since it is not necessary to use an adhesive to ensure insulation, it is possible to obtain a method for manufacturing a solar battery that can join the solar battery cell and the wiring board without using a large amount of adhesive.

  Moreover, in the manufacturing method of the solar cell having the above-described configuration, a flexible film substrate is used as the insulating substrate, and the substrate bending step is performed by evacuating the film substrate to the back electrode type solar cell side. It is preferable that the vacuuming process bends.

  Moreover, in the manufacturing method of the solar cell of the said structure, a base-material bending process and a sealing process are as a series of processes through the heating vacuum press-bonding process performed at a predetermined heating temperature and a predetermined vacuum pressure using a laminator apparatus. Preferably, it is done.

  According to the present invention, the insulating base material of the wiring board interposed on the electrode surface of the back electrode type solar battery cell is bent toward the back electrode type solar battery cell and is adjacent to each other of the back electrode type solar battery cell. By forming the depression between the electrodes, a solar battery that can join the solar battery cell and the wiring board without using a large amount of adhesive and a method for manufacturing the solar battery can be obtained.

It is typical sectional drawing which shows the structure of the solar cell which concerns on this invention. It is a typical top view which shows the electrode structure of the photovoltaic cell used for the solar cell of this invention. It is a typical top view which shows the wiring structure of the wiring board used for the solar cell of this invention. It is a typical top view which shows the 1st example of an embodiment which adhere | attaches and fixes a photovoltaic cell to a wiring board. It is typical sectional drawing explaining the cell arrangement | positioning process in the manufacturing method of the solar cell which concerns on this invention. It is typical sectional drawing explaining the lamination process in the manufacturing method of the solar cell which concerns on this invention. It is a typical top view which shows the example of 2nd Embodiment which adheres and fixes a photovoltaic cell to a wiring board. It is a typical top view which shows the 3rd embodiment which adheres and fixes a photovoltaic cell to a wiring board. It is typical sectional drawing which shows the principal part structure of the completion state of the solar cell which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. Moreover, the same code | symbol is used about the same structural member, and the overlapping description is abbreviate | omitted suitably. First, the solar cell according to the present embodiment will be described with reference to FIG.

  In FIG. 1, typical sectional drawing of an example of the solar cell 1 of this invention is shown. This solar cell 1 joins the solar cell 10 and the wiring board 20, and seals together through the sealing material 2, and forms a solar cell sealing body, This solar cell sealing body Both the front and back surfaces are covered with a translucent substrate 3 (glass substrate) and a weather resistant film 4 (back film).

  Here, an antireflection film 12 is formed on the light-receiving surface (surface on which sunlight is mainly incident) of the n-type or p-type silicon substrate 11 of the solar battery cell 10, and the back surface of the silicon substrate 11 ( The n-type impurity doped region 13 formed by diffusing n-type impurities and the p-type impurity doped region 14 formed by diffusing p-type impurities have a predetermined interval on the surface opposite to the light receiving surface). They are alternately formed.

  That is, the solar cell 10 according to the present embodiment is a back electrode type solar cell 10 in which two types of electrodes having different polarities are provided on one surface of a substrate (silicon substrate 11). It may also be referred to as solar cell 10 or back electrode type solar cell 10.

  Further, a passivation film 17 is formed on the back surface of the silicon substrate 11, and an N electrode 15 is formed so as to be in contact with the n-type impurity doping region 13 through a contact hole formed in the passivation film 17. A P electrode 16 is formed so as to be in contact with the doping region 14.

  In addition, another passivation film may be formed between the silicon substrate 11 and the antireflection film 12. The antireflection film 12 and the passivation film 17 can be formed from, for example, a silicon nitride film or a silicon oxide film.

  The wiring substrate 20 is a substrate in which a desired wiring pattern (N wiring 22 and P wiring 23) is formed on an insulating substrate 21, and a film material having flexibility and a material using a hard material as an insulating substrate. Some use In the present embodiment, the wiring board 20 having flexibility using the insulating base material 21 using a polyester film such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate) is used.

  For example, the wiring substrate 20 is formed by bonding an insulating film serving as a base material and a metal foil using an adhesive or the like, forming a protective resist on the surface of the metal foil in a desired shape, and then exposing the exposed metal foil. The wiring board 20 having a desired wiring pattern is formed by etching and removing the resist.

  That is, the solar cell according to the present embodiment includes the back electrode type solar cell 10 in which two types of electrodes having different polarities are provided on one surface of the substrate (silicon substrate 11), and the electrode on one surface of the insulating base material 21. Is a solar cell 1 including a flexible wiring board 20 provided with wirings (N wiring 22 and P wiring 23) corresponding to.

  As described above, since the wiring board 20 is made of a flexible film base material, it can be easily bent by being vacuumed after being bonded to the back electrode type solar battery cell 10. It can also be bent easily by being deformed while heating. In any case, it can be bent according to the surface shape of the mating member to be bonded (bonded).

  Therefore, in the solar cell 1 according to the present embodiment, the electrodes (N electrode 15 and P electrode 16) of the back electrode type solar cell 10 and the wiring (N wiring 22 and P wiring 23) of the wiring board 20 are electrically connected. And the insulating base material 21 is bent toward the back electrode type solar cell side (via a predetermined base material bending step) and between the adjacent electrodes of the back electrode type solar cell 10 (to each other). A recess K is formed between adjacent wirings.

  With this configuration, the insulating base material 21 is bent toward the back electrode type solar cell side and forms a recess K between the electrodes (N electrode 15 and P electrode 16) adjacent to each other. The amount of adhesive used to fill the gap between the insulating base 21 and the insulating base 21 can be reduced. In addition, it is possible to ensure insulation between adjacent electrodes via the insulating substrate 21. That is, the solar battery 1 that can join the solar battery cell 10 and the wiring board 20 without using a large amount of adhesive can be obtained.

  Moreover, if the recessed part of the insulating base material 21 is the structure which contacts the back surface electrode type photovoltaic cell 10 between the electrodes which mutually adjoin the back surface electrode type photovoltaic cell 10, this adjacent electrode will be ensured. Since insulation is possible, it is not necessary to use an adhesive to ensure insulation, and the amount of adhesive can be reduced, which is preferable.

  Moreover, it is preferable that the hollow part of the insulating base material 21 contacts the side surface which the mutually adjacent wiring opposes. If it is this structure, adjacent wiring can be insulated reliably and also a sealing material can be filled between adjacent wiring. Therefore, adjacent wirings can be reliably insulated via the sealing material filled in the depressions K, and positional deviation between the solar battery cell 10 and the wiring board 20 can be reliably prevented. Moreover, since the gap between the electrodes and between the wirings can be filled with the sealing material, the mechanical strength of the solar cell 1 can be improved.

  Next, the electrodes (N electrode 15 and P electrode 16) provided in the solar battery cell 10 will be described with reference to FIG. 2, and the wiring substrate 20 having the N wiring 22 and the P wiring 23 will be described with reference to FIG.

  For example, as shown in FIG. 2, the electrodes (N electrode 15 and P electrode 16) provided in the solar battery cell 10 according to the present embodiment include the strip-shaped N electrode 15 and P electrode 16 on one surface of the silicon substrate 11. It is set as the structure provided alternately in the up-down direction. That is, two types of electrodes having different polarities are alternately provided in a comb shape on one surface of the substrate.

  Moreover, the wiring board 20 provided with the wiring electrically connected to this electrode is formed into a long shape for joining a plurality of solar battery cells 10 together as shown in FIG. 3, for example. The wiring board 20 according to the present embodiment has a length for integrally joining the four photovoltaic cells 10 as shown in FIG. The insulating base 21 having this length is integrally formed with N wirings 22 and P wirings 23 corresponding to the strip-shaped N electrodes 15 and P electrodes 16 of the four solar cells 10.

  In addition, a connection electrode 24 for electrically connecting the N wiring 22 and the P wiring 23 respectively corresponding to the adjacent solar cells 10 is provided, and one end portion in the longitudinal direction of the insulating base material 21 is provided. The bus bar P electrode 25 is provided at the other end, and the bus bar N electrode 26 is provided at the other end.

  In addition, although not shown in the drawing, a mark, a slit, or the like for alignment of the solar cells 10 to be joined is provided so that the plurality of solar cells 10 can be joined (bonded) at an accurate position, and wiring is performed. It is preferable that the connection error can be suppressed.

  The solar cells 10 are bonded to the wiring substrate 20 to join the electrodes (N electrode 15 and P electrode 16) on the solar cell 10 side and the wirings (N wiring 22 and P wiring 23) on the wiring substrate 20 side. The bonding between the electrode and the wiring can be performed using a conventionally known conductive adhesive or solder, but in a state where the electrode on the solar cell 10 side and the wiring on the wiring substrate 20 side are aligned, It is also possible to bond the solar battery cell 10 and the wiring board 20 together.

  Therefore, in the present embodiment, the adhesive is disposed in a part of the region other than the electrodes and the wiring, and the solar cells 10 are temporarily fixed to the wiring substrate 20, and the sealing is performed through the sealing material 2 described above. By stopping, it becomes possible to electrically connect the electrode on the solar cell 10 side and the wiring on the wiring substrate 20 side.

  Accordingly, since the connection between the wiring of the wiring board 20 and the electrode of the solar battery cell 10 can be made by direct contact without using a conductive adhesive or solder, in addition to shortening the manufacturing process, the connection The electrical resistance in the portion can be lowered, and the electrical characteristics of the solar cell can be improved.

  For example, in the example shown in FIG. 4 (first embodiment), the region where the adhesive is disposed is provided at two locations on the diagonal line with respect to one solar battery cell 10.

  That is, in 1st Embodiment shown in FIG. 4, adhesive agent SB1 and SB2 are arrange | positioned on the insulating base material 21 of the wiring board 20 at two places on the diagonal line of the position where each photovoltaic cell 10 is joined. Then, the solar cells 10 are wired so that the positions of the electrodes (N electrode 15 and P electrode 16) on the solar cell 10 side and the wirings (N wiring 22 and P wiring 23) on the wiring board 20 side are matched. Temporarily fasten to the substrate 20.

  As described above, in the present embodiment, the wiring substrate 20 is bonded to the outer peripheral portion of the solar battery cell 10 partially using the adhesive SB (SB1, SB2). The adhesive SB is preferably an insulating adhesive (including a pressure-sensitive adhesive). For example, a silicone adhesive, an acrylic adhesive, an epoxy adhesive, a rubber adhesive, or the like is used. it can.

  In addition, in order to improve these adhesiveness between the insulating base material 21 and the photovoltaic cell 10 of the wiring board 20, resin may be arrange | positioned so that a clearance gap may be filled up.

  After temporarily fixing all the solar cells 10 to the wiring substrate 20, a laminating process for laminating and forming the sealing material 2, the translucent substrate 3, the weather resistant film 4, and the like, and the sealing material 2 are heated. A sealing step of hardening after softening is performed.

  As the sealing material 2, it is preferable to use a light-transmitting sealing material such as EVA (ethylene vinyl acetate) resin. Sheet-like EVA resin is laminated on the upper and lower sides of the solar cell 10 and the wiring substrate 20 that are bonded together. By performing the sealing step of vacuum pressure bonding while heating, the sealing material 2 having a configuration in which the solar cells 10 and the wiring substrate 20 are integrally sealed can be formed.

  In this way, by performing a sealing step of evacuating the structure formed by stacking the solar cell 10, the wiring substrate 20, and other members to a predetermined vacuum pressure while heating the structure to a predetermined temperature, insulation is achieved. The base material 21 is bent toward the back electrode type solar cell 10 to form the depression K, and the depression K is filled with the softened sealing material.

  That is, the predetermined temperature or the predetermined vacuum pressure in the sealing process is a temperature at which the insulating base 21 to be used is bent to form the depression K and the used sealing material is softened to fill the depression K. It is a vacuum pressure. In this way, the presence of the sealing material via the insulating base material 21 between the wirings adjacent to each other on the wiring board 20 improves the degree of pressure bonding between the solar battery cell 10 and the wiring board 20, so that Insulation between the matching electrodes can be increased. Therefore, it is possible to ensure electrical connection between the electrode on the solar cell 10 side and the wiring on the wiring substrate 20 side, and it is necessary to use a large amount of adhesive to ensure insulation between the electrodes. Therefore, it is possible to provide the solar cell 1 excellent in productivity.

  Thus, since it heats to predetermined temperature in a sealing process, as adhesive SB, it is preferable to use what shows the stable adhesiveness even when exposed to this predetermined temperature. Moreover, the reliability of the electrical connection between the solar battery cell 10 and the wiring board 20 can be maintained by exhibiting stable adhesiveness even after heating.

  Since the insulating base material 21 is relatively inexpensive and exhibits reliable insulating properties, it is preferably a material that is bent to the side of the solar battery cell 10 by evacuation to form the depression K and has a thickness. In this embodiment, a polyester film such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate) is used. The thickness is preferably about 25 to 150 μm, more preferably about 50 to 100 μm.

  Next, the manufacturing method of the solar cell according to the present embodiment will be further described with reference to FIGS.

  The method for manufacturing a solar cell according to the present embodiment includes the back electrode type solar cell 10 in which two types of electrodes having different polarities are provided on one surface of the substrate (silicon substrate 11), and the one surface of the insulating base material 21. It is a manufacturing method of the solar cell 1 provided with the wiring board 20 provided with the wiring corresponding to an electrode.

  In addition, a cell disposing step of disposing the back electrode type solar cell 10 on the wiring substrate so that the electrode of the back electrode type solar cell 10 and the wiring of the wiring substrate 20 face each other; A laminating process in which the sealing material 2A, the wiring substrate 20 on which the back electrode type solar cells 10 are arranged, and the second sealing material 2B are stacked in this order, and the insulating substrate of the wiring substrate 20 The base material bending step of bending the material 21 to the back electrode type solar cell side, the structure 30 is heated, and the first sealing material 2A and the second sealing material 2B are softened to form the back electrode type. And a sealing step for sealing the wiring substrate 20 on which the solar battery cells 10 are arranged.

  For example, FIG. 5 shows a schematic cross-sectional view for explaining the cell placement step, and FIG. 6 shows a schematic cross-sectional view for explaining the stacking step. As shown in FIG. 5, the cell placement process according to the present embodiment includes a back electrode type solar cell 10 having a configuration in which N electrodes 15 and P electrodes 16 having different polarities are alternately provided on one surface of a silicon substrate 11. A wiring board 20 having a configuration in which N wirings 22 and P wirings 23 are alternately provided on an insulating base material 21 made of a resin film is bonded with, for example, adhesive SB at two locations on the diagonal line.

  Here, the adhesive SB may be arranged in the electrode non-formation region of the back electrode type solar battery cell 10, but since the space of the wiring non-formation region of the wiring substrate 20 is wide, considering productivity, It is preferable to arrange on the wiring board 20 side.

  That is, in the cell placement step according to the present embodiment shown in FIG. 5, the back electrode solar cell 10 is placed on the wiring substrate 20 so that the wiring of the wiring substrate 20 and the electrode of the back electrode solar cell 10 face each other. Place. Here, the adhesive SB disposed in a part of the wiring non-formation region of the wiring substrate 20 is in contact with the electrode non-formation region of the back electrode solar cell 10, and the wiring substrate 20, the back electrode solar cell 10, Are bonded and temporarily fixed.

  Then, in the laminating process shown in FIG. 6, from above, the translucent substrate 3 (glass substrate), the sheet-like first sealing material 2A, the wiring substrate 20 on which the back electrode type solar cells 10 are temporarily fixed, and the sheet The structure 30 which laminated | stacked the 2nd sealing material 2B of a shape and the weather resistant film 4 (back film) in this order is formed.

  Next, this structure 30 is set in a laminator device. And the structure 30 is crimped | bonded to the up-down direction by performing the sealing process which evacuates to predetermined vacuum pressure, heating to predetermined temperature with a laminator apparatus. Then, the insulating base material 21 of the wiring board 20 is softened, bent to the cell side while being elongated, and a depression K is formed on the back electrode type solar cell 10 side.

  Further, in the process in which the insulating base material 21 is softened and bent, the gap is reduced so as to fill the gap between the back electrode type solar cell 10 and the wiring substrate 20. Further, the sealing materials 2A and 2B are softened and filled into the depression K. Further, the first sealing material 2A and the second sealing material 2B are integrated to form the sealing material 2 described above.

  Here, the base material bending step of bending the insulating base material 21 of the wiring board 20 to the back electrode type solar cell side, the structure 30 is heated, and the first sealing material 2A and the second sealing material are heated. The sealing step of softening the material 2B and sealing the wiring substrate 20 on which the back electrode type solar cells 10 are arranged may be performed as a series of steps using the laminator device described above. The substrate bending step and the sealing step may be performed independently of each other.

  In that case, after bonding the wiring board 20 and the back electrode type solar cell 10 and temporarily fixing them, a method of evacuating or a method of applying pressure by air pressure while blowing hot air and heating is adopted. Can do. However, in the manufacturing process of the solar cell 1, a sealing process for evacuating while heating is employed, and thus the base material bending process can be performed using this sealing process. In this way, if the base bending process and the sealing process are performed as a series of processes, the manufacturing process can be shortened, and the manufacturing is effective in terms of cost and process simplification. Preferred as a method.

  For example, the base material bending step and the sealing step can be carried out as a series of steps via a laminator device that performs a heating vacuum pressing step at a predetermined heating temperature and a predetermined vacuum pressure. With this configuration, it is possible to shorten the manufacturing process, which is preferable as a manufacturing method effective for cost and process simplification.

  That is, by performing a vacuum pressure bonding process and a heat curing process as a series of processes using a laminator device, the above-described base material bending process and sealing process can be performed continuously. For example, the structure 30 in which the back electrode type solar cell 10, the sealing material 2 (EVA), the translucent substrate 3, and the weather-resistant film 4 are integrally laminated is installed in a laminator device and evacuated while being evacuated. After holding at 7 ° C. for 7 minutes (vacuum pressure bonding step), by heating at 145 ° C. for 40 minutes (heat curing step), EVA is cured and the back electrode type solar cell 10 is pressure-bonded and sealed to produce solar cell 1. To do.

  In the above, the adhesive (adhesive material) SB is applied to one cell (back electrode type solar battery cell 10) in a part of the wiring non-formation region of the wiring board in the vicinity of the outer periphery of the cell arrangement region. Although the configuration (first embodiment) provided in two points on the diagonal line has been described, the arrangement position of the adhesive (adhesive material) SB is not limited to such a configuration.

  For example, in the example shown in FIG. 7 (second embodiment), the adhesives are arranged in a plurality of spots in a plurality of places with respect to one side of the cell (two places for one side and a total of four places for one cell). SB1 to SB4 are adopted. Further, in the example shown in FIG. 8 (third embodiment), the adhesives SB5 and SB6 arranged in a line at two locations on opposite sides are employed.

In any case, the adhesive SB (SB1 to SB6) is disposed in a part of the wiring non-formation region of the wiring substrate 20 near the outer periphery of the cell arrangement region, and the wiring substrate 20 and the solar battery cell 10 are bonded together. The same is true. In other words, adhesive (including adhesive) in the wiring formation area inside the board
Therefore, the amount of the adhesive and the pressure-sensitive adhesive may be small.

  That is, the amount of the necessary adhesive or pressure-sensitive adhesive is sufficient if it can be adhered and temporarily fixed to the extent that the wiring substrate 20 and the solar battery cell 10 are not misaligned in the base material bending step or the sealing step, Adhesives SB (SB1 to SB6) need only be installed at a plurality of locations in the vicinity of the outer peripheral portion of the cell arrangement region in the form of dots or lines.

  As described above, the solar cell manufacturing method according to the present embodiment includes the flexible wiring board 20 and the solar battery cell 10 by arranging the adhesive SB in a part of the region other than the electrode and the wiring. A cell placement step for temporarily fixing, a laminating step for forming the structure 30, a base material bending step for bending the insulating base material 21 of the wiring board 20 to the solar cell side, and heating and sealing the structure 30 Sealing step.

  With this solar cell manufacturing method, it is not necessary to use an adhesive to ensure insulation in the wiring formation region, so the solar cells 10 and the wiring substrate 20 can be joined without using a large amount of adhesive. The manufacturing method of the solar cell which can be obtained can be obtained.

  The solar cell 1 is manufactured through the steps as described above, and as shown in FIG. 9, an aluminum frame 40 is attached around the solar cell 1 and a terminal box 8 is attached to take out electricity to the outside. The converted solar cell module M is completed. The electricity generated by the solar cell module M can be taken out via the output cable 81.

  Moreover, the penetration | invasion of the water | moisture content to the solar cell 1 is effective by covering parts other than the glass substrate 3 with the laminated | multilayer film which laminated | stacked the metal film which has the function which suppresses permeation | transmission of water | moisture, and the resin film which has insulation. Further, a configuration in which the aluminum frame 40 is fitted around the outer periphery may be adopted.

  As described above, the means for solving the problem corresponding to claim 1 of the present invention is provided with two types of electrodes (N electrode 15 and P electrode 16) having different polarities on one surface of the substrate (silicon substrate 11). A solar cell 1 comprising a back electrode type solar battery cell 10 and a wiring substrate 20 provided with wiring (N wiring 22 and P wiring 23) corresponding to the electrode on one surface of an insulating base material 21. The electrode of the electrode type solar cell 10 and the wiring of the wiring board 20 are electrically connected, and the insulating base material 21 is bent toward the back electrode type solar cell 10 side, so that the back electrode type solar cell. The depression K is formed between 10 adjacent electrodes.

  The effect corresponding to the first aspect is that the insulating base material 21 is bent toward the back electrode type solar battery cell and forms a recess K between the adjacent electrodes. The amount of adhesive used to fill the gap between the material 21 can be reduced. In addition, it is possible to ensure insulation between adjacent electrodes via the insulating substrate 21. That is, the solar battery 1 that can join the solar battery cell 10 and the wiring board 20 without using a large amount of adhesive can be obtained.

  The means for solving the problem corresponding to claim 2 is that the recessed portion of the insulating base 21 is in contact with the back electrode solar cell 10 between the electrodes of the back electrode solar cell 10 adjacent to each other. It is. The effect corresponding to the second aspect is that the adjacent electrodes can be reliably insulated from each other, so that it is not necessary to use an adhesive to ensure insulation, and the amount of the adhesive can be reduced. .

  A means for solving the problem corresponding to claim 3 is that the recessed portion of the insulating base material 21 is in contact with the opposite side surfaces of the wirings adjacent to each other. The effect corresponding to the third aspect is that the adjacent wirings can be reliably insulated from each other, and the sealing material can be filled between the adjacent wirings.

  A means for solving the problem corresponding to claim 4 is that the back electrode type solar cell 10 and the wiring substrate 20 are sealed with the sealing material 2, and the recess K is filled with the sealing material 2, That is, a sealing material exists between the wirings adjacent to each other on the wiring board 20 via the insulating base material 21. The effect corresponding to the fourth aspect is that the connecting portions between the adjacent electrodes and the wiring are reliably insulated via the sealing material filled in the depression K, and further, the solar battery cell 10 and the wiring substrate 20 Can be reliably prevented.

  The means for solving the problem corresponding to claim 5 corresponds to the back electrode type solar cell 10 in which two kinds of electrodes having different polarities are provided on one surface of the substrate, and the electrode on one surface of the insulating base 21. A method of manufacturing a solar cell 1 including a wiring substrate 20 provided with wiring, wherein the back electrode type solar cell 10 and the wiring of the wiring substrate 20 are opposed to each other so that the electrodes on the wiring substrate 20 face each other. The cell placement step for placing the solar cells 10, the translucent substrate 3, the first sealing material 2 </ b> A, the wiring substrate 20 on which the back electrode solar cells 10 are placed, and the second sealing material 2 </ b> B A laminating process for sequentially stacking the structure 30, a base material bending process for bending the insulating base material 21 of the wiring substrate 20 toward the back electrode type solar cell side, and heating the structure 30, Soften the sealing material 2A and the second sealing material 2B, The wiring board 20 electrode type solar cell 10 is disposed is to include a sealing step of sealing. The effect corresponding to claim 5 is that it is not necessary to use an adhesive in order to ensure insulation between adjacent electrodes, so that the solar battery cell 10 and the wiring substrate 20 can be joined without using a large amount of adhesive. The manufacturing method of the solar cell 1 which can be obtained can be obtained.

  A means for solving the problem corresponding to claim 6 uses a flexible film base material as the insulating base material, and the base material bending step evacuates the film base material to form a back electrode type solar cell. It is a vacuum drawing process to bend to the side. The effect corresponding to the sixth aspect is that the flexible film substrate can be evacuated and the substrate bending step can be easily performed.

  A means for solving the problem corresponding to claim 7 is a series of steps through a heating vacuum pressure bonding step in which the base material bending step and the sealing step are performed at a predetermined heating temperature and a predetermined vacuum pressure using a laminator device. It is that it was set as the manufacturing method of the solar cell 1 performed as follows. The effect corresponding to the seventh aspect is that the base material bending step and the sealing step can be carried out as a series of steps through a heating / vacuum pressing step in which vacuum pressing is performed by heating to a predetermined temperature. Therefore, the manufacturing process can be shortened, and the manufacturing method is effective in terms of cost and process simplification.

  As described above, according to the present invention, the insulating base material of the wiring board interposed in the electrode surface of the back electrode type solar cell is bent toward the back electrode type solar cell side, and the back electrode type solar cell By forming a recess between the electrodes adjacent to each other in the cell, a solar battery that can join the solar battery cell and the wiring board without using a large amount of adhesive and a method for manufacturing the solar battery can be obtained.

  In addition, the connection between the wiring of the wiring board and the electrode of the back electrode type solar battery cell can be made by direct contact without using a conductive adhesive. The electrical resistance of the solar cell can be reduced, and the electrical characteristics of the solar cell can be improved.

  Since the solar cell and the method thereof according to the present invention can join the solar cell and the wiring board without using a large amount of adhesive, the solar cell required to shorten the manufacturing process and reduce the cost, and its It can be suitably used for the manufacturing method.

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Sealing material 3 Translucent substrate 4 Weather resistance film 10 Solar cell (back electrode type solar cell)
DESCRIPTION OF SYMBOLS 11 Silicon substrate 12 Antireflection film 13 N-type impurity doping area | region 14 P-type impurity doping area | region 15 N electrode 16 P electrode 17 Passivation film | membrane 20 Wiring board 21 Insulating base material 22 N wiring 23 P wiring 30 Structure 40 Frame K hollow M Solar cell module SB (SB1 to SB6) Adhesive

Claims (4)

A solar cell comprising a back electrode type solar cell in which two types of electrodes having different polarities are provided on one surface of a substrate, and a wiring substrate in which a wire corresponding to the electrode is provided on one surface of an insulating substrate. ,
The electrode of the back electrode solar cell and the wiring of the wiring board are electrically connected;
The insulative base material is bent toward the back electrode solar cell side to form a recess between the electrodes of the back electrode solar cell adjacent to each other;
The solar cell, wherein the indented portion of the insulating base material is in contact with the back electrode type solar battery cell between the adjacent electrodes of the back electrode type solar battery cell.   2. The solar cell according to claim 1, wherein the recessed portion of the insulating base material is in contact with opposing side surfaces of the wirings adjacent to each other.   The back electrode type solar cell and the wiring board are sealed with a sealing material, the recess is filled with a sealing material, and the insulating property is provided between the wirings adjacent to each other on the wiring board. The solar cell according to claim 1, wherein the sealing material is present via a base material.   The back electrode type solar cell and the wiring substrate are sealed with a sealing material, and separately from the sealing material, the back electrode type solar cell at the outer periphery of the back electrode type solar cell. 4. The solar cell according to claim 1, further comprising an insulating adhesive that adheres the wiring board to the wiring board.

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