JP2009302327A - Connection structure of wiring member, solar-battery module comprising the same, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the connection structure of a wiring member which electrically connects an electrode and the wiring member without forming an insulating member on a substrate on which the electrode is formed suppressing an electric loss, and to provide a solar-battery module and its manufacturing method. <P>SOLUTION: One solar-battery cell and the other solar-battery cell which are adjacent to each other are electrically connected in series by a wiring member 20 comprising a base 21 and an insulating layer 22 with which the base 21 is covered. Each electrode 8 of each solar-battery cell and the wiring member 20 are electrically connected with each other by applying pressure to a joining member 30 at a predetermined temperature and thereby making a conductive particle 31 contained in the joining member 30 break through the insulating layer 22 of the wiring member 20 and come into contact with the base 21 of the wiring member 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wiring member connection structure, a solar cell module including the wiring member connection method, and a method of manufacturing the same, and more particularly, to a wiring member connection structure in which a wiring member is electrically connected to a predetermined electrode, and to the wiring member. The present invention relates to a solar cell module having a connection structure and a method for manufacturing the solar cell module.

  In solar cells that are currently mass-produced, double-sided electrode type solar cells occupy a large number. In a general double-sided electrode type solar cell, an n-electrode is formed on the surface (light-receiving surface) of the solar cell, and a p-electrode is formed on the back surface. The n-electrode formed on the light-receiving surface is indispensable for taking out the current generated when sunlight enters the solar battery cell. However, in the portion (region) of the solar battery cell where the n electrode as the extraction electrode is arranged, the n electrode is shaded so that sunlight does not enter and no current is generated.

  Therefore, a back junction solar cell has been developed in which a take-out electrode is not formed on the light receiving surface side, but a take-out electrode is formed on the back side and a pn junction is formed. In a solar cell module (string) including a plurality of back junction solar cells, the back junction solar cells are electrically connected to each other using a predetermined wiring member. Conventionally, three methods are known for wiring of the back junction solar cell.

  First, as a first technique, in the technique proposed in Patent Document 1 or Non-Patent Document 1, the electrodes 102 and 103 are formed on the back surface of the solar battery cell 101 as shown in FIGS. An insulating material 104 is formed in an area excluding the existing area. This insulating material 104 prevents the wiring member 105 connected to the electrodes 102 and 103 taken out from the light receiving surface side from directly contacting the back surface of the solar battery cell 101.

  Next, as a second technique, in the technique already used for one product, as shown in FIGS. 32 and 33, the electrode area (n electrode 202) taken out from the light receiving surface and the back surface of the solar battery cell 201 are used. Electrode (p electrode 203) is formed along substantially the same straight line. In one solar cell 201, one end side of the wiring member 204 is connected so as not to protrude from the area of the n electrode 202, and the other end side is connected to the p electrode 203 of the adjacent solar cell 201. Thus, the wiring member 204 connected to the n-electrode 202 is connected without being in electrical contact with the p-electrode 203 of the solar battery cell 201.

Next, as a third technique, in the technique already used for other products, as shown in FIGS. 34 and 35, the comb-shaped electrode 302 is formed on the back surface of the solar battery cell 301 so as to face each other with silver paste. 303 are collected, plus (p) charges are collected on one electrode, and minus (n) charges are collected on the other electrode. An electrode area 304 for connecting the wiring member 305 is provided at opposite ends of the solar battery cell 301. The electrode area 304 on one end side is connected to the plus (p) comb-shaped electrode 302, and the electrode on the other end side. The area 304 is connected to the negative (n) comb-shaped electrode 302. A wiring member 305 is disposed and soldered so as to pass the n electrode area 304 of one solar cell 301 adjacent to each other and the p electrode area 304 of another solar cell 301.
US 6,559,479 Marcel Meuwissen et al., “SIMULATION ASSISTED DESIGN OF A PV MODULE INCORPORATING ELECTRICALLY CONDUCTIVE ADHESIVE INTERCONNECTS”, 21st European Photovotaic Solar Energy Conference and Exhibition (2006)

  However, the conventional back junction solar cell has the following problems. First, in the first method, as shown in FIG. 31, the insulating material 104 is formed in a region excluding the region where the electrodes 102 and 103 are formed, so that the portions of the electrodes 102 and 103 become the insulating material 104. It becomes a dent against. Therefore, joining of the wiring member 105 corresponding to the dent is required. Further, there is a problem that the solar battery cell 101 is warped by forming the insulating material 104.

  In the second method, as compared with the first method, the average distance that passes through the sub-electrodes and the like formed in the solar battery cell 201 before the charge generated by the power generation is collected by the wiring member 204 becomes longer. Since this portion has a higher resistance than the wiring member 204, electrical loss increases.

  In the third method, the electric charge generated by the power generation is collected by the wiring member 305 through the comb-shaped electrodes 302 and 303 having a higher resistance than that of the wiring member 305, and therefore, compared with the first method. , The electrical loss increases.

  The present invention has been made in order to solve the above-described problems, and its object is to suppress electrical loss and to electrically connect the electrode and the wiring member without forming an insulating material on the substrate on which the electrode is formed. Another object is to provide a solar cell module including the wiring member connection structure in which a simple connection is made, and still another object is to manufacture such a solar cell module. Is to provide a method.

  A wiring member connection structure according to the present invention is a wiring member connection structure in which a wiring member is electrically connected to a predetermined electrode, and includes a substrate having a main surface, an electrode, a bonding member, and a wiring member. Yes. The electrode is formed on the main surface of the substrate. The joining member is formed so as to cover the surface of the electrode. The wiring member is disposed on the bonding member and is electrically connected to the electrode via the bonding member. The wiring member includes a base material formed of a predetermined conductive material, and an insulating layer including a predetermined insulating material formed on a surface of the base material facing at least the bonding member. The bonding member includes conductive particles that break through the insulating layer of the wiring member and come into contact with the base material.

  According to this configuration, the conductive member contained in the joining member breaks through the insulating layer of the wiring member and contacts the substrate, whereby the wiring member is electrically connected to the electrode. Thereby, a wiring member can be connected to an electrode, without forming an insulating material in a board | substrate. Further, since the wiring member is covered with the insulating layer, the wiring member is not electrically short-circuited with an electrode other than a predetermined electrode, so that the degree of freedom of electrode layout can be increased, and the electrical Loss can be suppressed.

  Specifically, it is preferable that the bonding member includes either an anisotropic conductive film or an anisotropic conductive paste, and the conductive particles are included in either of them.

  In addition, as the conductive material forming the base material of the wiring member, at least one of copper (Cu), aluminum (Al), nickel (Ni), gold (Au), silver (Ag), and titanium (Ti) is used. It is preferable to include.

  Furthermore, as the conductive material, copper (Cu) coated with solder or silver (Ag), copper (Cu) / aluminum (Al) / copper (Cu), and copper (Cu) / Invar / copper ( Cu) is preferably included.

  Moreover, you may apply the base material containing a predetermined | prescribed insulating film and the circuit pattern formed with the electroconductive foil on the insulating film as a base material.

  As the insulating film of the base material, one of polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, and polyvinyl fluoride. It is preferable to contain.

  The conductive material of the wiring member may be copper (Cu), and the insulating material may be an oxide film formed on the copper surface by blackening treatment or the like. Alternatively, the conductive material of the wiring member may be aluminum, and the insulating material may be an aluminum oxide film formed on the surface of the aluminum.

  The insulating material of the insulating layer of the wiring member preferably includes an insulating organic material or an insulating inorganic material.

  When the insulating material is an insulating organic material, the insulating organic material preferably contains any of polyimide, poly-imide, epoxy, and acrylic.

  On the other hand, when the insulating material is an insulating inorganic material, the insulating inorganic material preferably contains either silica or alumina.

  The solar cell module which concerns on this invention is a solar cell module provided with the connection structure of the wiring member in any one of the claims which concern on the connection structure of a wiring member. The substrate is a solar cell, and the electrodes are a first electrode and a second electrode having different polarities formed in the solar cell. A predetermined number of solar cells are connected in series in a mode in which the first electrode of one solar cell and the second electrode of another solar cell are connected by the wiring member.

  According to this configuration, the conductive member contained in the joining member breaks through the insulating layer of the wiring member and contacts the substrate, whereby the wiring member is electrically connected to the electrode. Thereby, a wiring member can be connected to an electrode, without forming an insulating material in a photovoltaic cell. Further, since the wiring member is covered with the insulating layer, the wiring member is not electrically short-circuited with an electrode other than the predetermined electrode, so that the degree of freedom in electrode layout can be increased. Electrical loss in the module can be suppressed.

  The manufacturing method of the solar cell module according to the present invention includes the following steps. A solar battery cell in which electrodes are arranged is formed. A joining member containing predetermined conductive particles is supplied to the surface of the electrode. A wiring member covered with a predetermined insulating layer is prepared, and the wiring member is disposed so as to contact the bonding member. The electrode and the wiring member are electrically connected through the conductive particles by performing a heat treatment while pressing the wiring member against the solar battery cell in such a manner that the insulating layer is pierced by the conductive particles.

  According to this method, by performing the heat treatment while pressing the wiring member against the solar cell side, the conductive particles contained in the bonding member break through the insulating layer of the wiring member and contact the substrate, thereby The member is electrically connected to the electrode. Thereby, a wiring member can be connected to an electrode, without forming an insulating material in a photovoltaic cell. Moreover, since the wiring member is covered with the insulating layer, the wiring member is not electrically short-circuited with an electrode other than the predetermined electrode, so that the degree of freedom of electrode layout can be increased, and the solar cell module The electrical loss in can be suppressed.

Embodiment 1
A solar cell module according to Embodiment 1 of the present invention will be described. In the solar cell module, a plurality of solar cells are connected in series by a predetermined wiring member. As a basic configuration of the solar cell module, two adjacent solar cells and a wiring member connecting them in series are shown in FIG. As shown in FIG. 1, in the solar cell module, the adjacent solar cells 1a and 1b are electrically connected in series by a comb-shaped wiring member 20 having comb portions 20a and 20b. .

  As shown in FIG. 2, a plurality of n-electrodes 8 and p-electrodes 9 are formed on the back surfaces of solar cells 1a and 1b adjacent to each other. The n electrode 8 and the p electrode 9 are arranged along a row (up and down direction in the drawing). The comb part 20a of the wiring member 20 is electrically connected to the p electrode 9 of the solar battery cell 1b, and the comb part 20b is electrically connected to the n electrode 8 of the solar battery cell 1a. As will be described later, the p (n) electrodes 9 and 8 and the wiring member 20 are electrically connected by a predetermined bonding member.

  Next, the structure of the solar battery cell 1 will be described in more detail. As shown in FIGS. 2 and 3, the solar cell 1 is composed of a semiconductor substrate 2 having a predetermined size. A cell p layer 3 is formed in the semiconductor substrate 2, and a through hole 5 is formed so as to penetrate the cell p layer 3. A cell n layer 4 is formed on the surface of the cell p layer 3 including the side wall of the through hole 5.

  An n electrode 8 that contacts the cell n layer 4 and fills the through hole 5 is formed to be exposed on the front surface side and the back surface side. The portion exposed to the front side becomes the light receiving surface electrode 7. Further, a p-electrode 9 is formed on the back surface of the cell p layer 3. A cell p + layer 6 is formed on the back surface of the cell p layer 3, and an aluminum dust layer 10 is formed on the cell p + layer 6. The aluminum dust layer 10 is electrically insulated from the n electrode 8 at a predetermined distance. On the other hand, the aluminum dust layer 10 may be electrically connected to the p electrode 9.

  Next, the wiring member 20 will be described. As shown in FIG. 4, the wiring member 20 includes a predetermined base material 21 and an insulating layer 22. In this wiring member 20, the insulating layer 22 is formed so as to cover the entire surface of the substrate 21. As the base material 21, for example, a conductive material such as copper (Cu), aluminum (Al), nickel (Ni), gold (Au), silver (Ag), or titanium (Ti) is applied. Also, copper (Cu), copper (Cu) / aluminum (Al) / copper (Cu), or copper (Cu) / invar / copper (Cu) laminated with solder or silver (Ag) A conductive material of structure may be applied. The shape of the base material 21 is preferably a flat wire, a stranded wire, a round wire or the like.

  Further, as the base material 21, copper (Cu) is formed on the surface of an insulating film such as PET (Polyethylene terephthalate), PEN (Polyethylene naphthalate), PBT (Polybutylene terephthalate), PPS (Polyphenylene sulfide), or PVF (Polyvinyl fluoride). ) Or a sheet having a circuit pattern formed of a conductive material foil such as aluminum (Al).

  Next, an insulating organic material such as polyimide (Polyimide), polyamideimide (Polyamide-imide), epoxy, or acrylic is applied as the insulating layer 22. Further, an insulating inorganic material such as silica or alumina may be applied. Further, when aluminum is applied as the base material 21, an insulating surface treatment may be performed on the conductor itself, such as by anodizing the surface of the aluminum or performing a chemical conversion treatment. Examples of the method for forming the insulating layer 22 include electrolytic coating, powder coating, spray coating, thermal spraying, dipping, sputtering, vapor deposition, and spraying.

  Next, the joining member will be described. As shown in FIGS. 5 and 6, the joining member 30 is interposed between the p (n) electrodes 8 and 9 and the wiring member 20 to electrically connect them. As the joining member 30, there is an anisotropic conductive film (ACF), an anisotropic conductive paste (ACP), or the like. The anisotropic conductive film and the anisotropic conductive paste contain conductive particles.

  As shown in FIG. 7, by applying pressure to the bonding member 30, the conductive particles 31 break through the insulating layer 22 covering the wiring member 20, and the conductive particles 31 come into contact with the base member 21 to contact the wiring member 20. The electrodes 8 and 9 are electrically connected. The particle size of the conductive particles 31 is preferably sufficiently larger than the thickness of the insulating layer 22. For example, when the thickness of the insulating layer 22 is about 6 μm, the particle size of the conductive particles 31 is about 20 μm. It is preferably about ˜30 μm.

  The conductive particles 31 are desirably metal particles having sharp irregularities. Thereby, the conductive particles 31 can easily break through the insulating layer 22, and the wiring member 20 and the p (n) electrodes 8 and 9 can be electrically connected reliably.

  Furthermore, it is desirable that the conductive particles 31 are a material harder than the material forming the insulating layer 22, or the base material 21 itself of the wiring member 20 is softer than the conductive particles 31. Thereby, the conductive particles 31 can easily break through the insulating layer 22, and the wiring member 20 and the p (n) electrodes 8 and 9 can be electrically connected more reliably. As an example, it is preferable to apply an aluminum wiring member 20 having an anodized film formed on the surface and to apply and connect nickel (Ni) conductive particles 31 having irregularities formed on the surface.

Embodiment 2
Next, an example of a method for manufacturing a solar cell module will be described. Here, an anisotropic conductive paste is taken as an example of the joining member. First, as shown in FIG. 8, the solar battery cell 1 in which the p electrode 9 and the n electrode 8 are disposed on the back surface opposite to the light receiving surface is formed. Next, as shown in FIG. 9, the anisotropic conductive paste 33 is supplied onto the surface of the p electrode 9 and the surface of the n electrode 8 by dipping, for example. In addition to dropping the anisotropic conductive paste, for example, it may be applied using a printing method such as screen printing.

  Next, as shown in FIG. 10, the comb portion 20b of the wiring member 20 contacts the anisotropic conductive paste 33 dropped on the n electrode 8 of the solar cell 1a, and the comb portion 20a is the p electrode 9 of the solar cell 1b. The wiring member 20 is arrange | positioned so that the solar cell 1a and the photovoltaic cell 1b which straddle may be straddled in the aspect which contacts the anisotropic electrically conductive paste 33 dripped in the. Next, as shown in FIG. 11, by using a predetermined jig 50 and pressing the comb portions 20 a and 20 b of the wiring member 20 from above with a predetermined pressure at a predetermined temperature, the joining member 30 is pressed. The conductive particles 31 contained in the paste penetrate through the insulating layer 22 and contact the substrate 21 (see FIG. 7), and the wiring member 20 and the p (n) electrodes 8 and 9 are electrically connected. In this way, a predetermined number of solar cells 1 are connected in series by the wiring member 20 to form a solar cell string.

  Next, the solar cell string is sandwiched between sealing materials 62 such as an EVA (Ethylene Vinyl Acetate) film, and further sandwiched between the glass plate 63 and the back film 61 (see FIG. 12). Next, in that state, the bubbles are removed by reducing the pressure between the glass plate 63 and the back film 61. Next, the solar cell string is sealed with the sealing material 62 by heating the sealing material 62 under a predetermined temperature to cure the sealing material 62.

  From the back film 61, one external terminal 65a and the other external terminal 65b of the solar cell string are taken out toward the outside. Then, the solar cell module 60 is completed as shown in FIG. 12 by attaching the glass plate 63, the sealing material 62, and the back surface film 61 to the flame | frame 64 which consists of aluminum frames.

  In the solar cell module described above, an anisotropic conductive paste is supplied by supplying an anisotropic conductive paste between the wiring member 20 and the p (n) electrodes 8 and 9 and applying pressure and heat from above in that state. The conductive particles 31 included in the electrode can break through the insulating layer 22 and come into contact with the base material 21 so that the wiring member 20 and the p (n) electrodes 8 and 9 can be electrically connected reliably.

(Modification of wiring member)
As the wiring member, the wiring member 20 in which the insulating layer 22 is formed on the entire surface of the base material 21 has been described as an example. For example, as shown in FIG. 13, one surface of a predetermined film material 23 Alternatively, the wiring member 20 may be applied in which the substrate 21 is attached to the surface and the surface thereof is covered with the insulating layer 22.

  Moreover, as shown in FIG. 14, the wiring member 20 which coat | covered the insulating layer 22 only on the surface of the base material 21 facing a photovoltaic cell may be sufficient, and as shown in FIG. 15, the surface facing a photovoltaic cell In addition, the wiring member 20 may be formed by covering the end surfaces of the both ends with the insulating layer 22. Moreover, the wiring member 20 of the aspect which bent the both ends of the longitudinal direction of the base material 21 upwards may be sufficient as the wiring member shown by FIG. 14 as shown in FIG. Further, the wiring member shown in FIG. 14 may be a wiring member 20 in a form in which both ends in the longitudinal direction of the substrate 21 are bent inward as shown in FIG.

Embodiment 3
Next, another example of the method for manufacturing a solar cell module will be described. Here, an anisotropic conductive film is taken as an example of the bonding member. An anisotropic conductive film will be affixed on a photovoltaic cell from a predetermined | prescribed tape material. As shown in FIG. 18, in the tape material 35, release films 37 and 38 are attached to one surface and the other surface of the anisotropic conductive film 36, respectively. The tape material 35 is wound around a predetermined reel, and when the wiring member is connected, the tape material 35 is pulled out from the reel and cut into a predetermined shape.

  The manufacturing flow is shown in FIG. First, the tape material is pulled out from the reel (see FIG. 20) (step S1). Next, as shown in FIG. 20, of the release films 37 and 38, the release film 37 facing the solar battery cell 1 is peeled off from the anisotropic conductive film 36 and wound on another reel ( Step S2). Next, the drawn tape material 35 is punched into a predetermined shape corresponding to the planar shape of the electrode (step S3).

  Next, the punched tape material 35 is adhered to the surface of the p (n) electrodes 9 and 8 (step S4). At this time, for example, the tape material 35 punched out by a Bernoulli chuck or the like is conveyed to the p (n) electrodes 9 and 8, and the tape is set at predetermined coordinates corresponding to the positions of the p (n) electrodes 9 and 8. The material 35 may be arranged. Further, the tape material may be arranged on the p (n) electrodes 9 and 8 by image recognition.

  Next, as shown in FIG. 21, a predetermined jig 50 is used to apply pressure (about 0.5 to 1.5 MPa) from above to the tape material 35 adhered to the surface of the p (n) electrodes 9 and 8. ) And heating (about 70 ° C. to 90 ° C.) to temporarily cure the tape material 35 (step S5). Next, the release film 38 (see FIG. 18) is peeled from the anisotropic conductive film 36 to expose the anisotropic conductive film 36 (step S6). Next, the wiring member 20 (refer FIG. 10) is arrange | positioned so that the adjacent photovoltaic cell 1a and the photovoltaic cell 1b may be straddled (step S7).

  Next, the conductive particles 31 contained in the anisotropic conductive film 36 are insulated from the wiring member 20 by applying pressure (about 2 to 4 MPa) from above and heating (temperature about 150 ° C. to 200 ° C.). The layer 22 is penetrated to contact the base material 21 (see FIG. 7), and the p (n) electrodes 9, 8 of the solar battery cell 1 and the wiring member 20 are electrically connected (step S8). Thus, a solar cell string is formed. Thereafter, as described above, the solar cell module is completed by sealing the solar cell string.

  In the solar cell module described above, the anisotropic conductive film 36 is interposed between the wiring member 20 and the p (n) electrodes 8 and 9, and in this state, pressure and heat are applied from above, whereby the anisotropic conductive film. The conductive particles 31 contained in the film 36 can penetrate the insulating layer 22 and contact the base material 21 of the wiring member 20 to electrically connect the wiring member 20 and the p (n) electrodes 8 and 9 reliably. it can.

  In the above-described embodiment, the case where the tape material 35 is punched into the shape of the p (n) electrodes 9 and 8 has been described as an example. However, as shown in FIG. ) A shape substantially the same as the planar shape of the electrodes 9 and 8 (left end) or a slightly smaller size is preferable. For example, a rectangular shape may be used in addition to the circular shape.

Embodiment 4
In the above-described embodiment, the case where the anisotropic conductive film is punched into the shape of the p (n) electrode has been described as an example. Here, a case where an anisotropic conductive film is cut to a predetermined length and attached to a solar battery cell will be described as an example. In FIG. 23, the sticking aspect of the anisotropic conductive film is shown. As shown in FIG. 23, the anisotropic conductive film 36 is attached to a predetermined length along the row in which the p (n) electrodes 9 and 8 are arranged.

  As shown in FIG. 24, first, the tape material 35 is pulled out from the reel 39 (step S1), and among the release films 37 and 38, the release film 37 facing the solar battery cell 1 is replaced with the anisotropic conductive film 36. And is wound on another reel (step S2). Next, the drawn tape material 35 is cut to a predetermined length (step S3). Next, the tape material 35 cut to a predetermined length is adhered to a predetermined position of the solar battery cell 1 so as to continuously cover the electrodes 9 and 8 having the same polarity (step S4).

  Next, as shown in FIG. 25, using a predetermined jig 50, pressure (about 0.5 to 1.5 MPa) is applied to the tape material 35 adhered to the surface of the solar battery cell 1 from above. The tape material 35 is temporarily cured by heating (about 70 ° C. to 90 ° C.) (step S5). Next, the release film 38 is peeled from the anisotropic conductive film 36 to expose the anisotropic conductive film 36 (step S6).

  Next, as shown in FIG. 26, the wiring member 20 is disposed so as to straddle the adjacent solar battery cell 1a and the solar battery cell 1b (step S7). Next, as shown in FIG. 27, by using a predetermined jig 50 and applying pressure (about 2 to 4 MPa) from above and heating (temperature about 150 ° C. to 200 ° C.), anisotropy is achieved. The conductive particles 31 contained in the conductive film 36 break through the insulating layer 22 of the wiring member 20 and come into contact with the base material 21 of the wiring member 20 (see FIG. 7), and the p (n) electrodes 9, 8 of the solar battery cell 1. And the wiring member 20 are electrically connected (step S8). At this time, with respect to the n electrode 8, it is necessary to apply pressure only to a portion of the wiring member 20 in contact with the n electrode 8 so as not to be electrically short-circuited with the p electrode 9 through the aluminum dust layer.

  In the method for manufacturing the solar cell module described above, the following effects can be obtained in addition to the effects described above. That is, when the anisotropic conductive film 36 containing conductive particles is cut and attached to the solar battery cell 1, the number of anisotropic conductive films 36 corresponding to the number of the electrodes 9 and 8 is cut. It is only necessary to attach the anisotropic conductive film 36 to the solar battery cell 1 in an efficient manner, and the attaching operation can be completed in a shorter time.

  Moreover, you may combine the method of punching the anisotropic conductive film mentioned above in the shape of an electrode, and the method of cutting an anisotropic conductive film to predetermined length. In this case, the anisotropy punched into the shape of the electrode as shown in FIG. 28 is performed so that the n-electrode 8 is not electrically short-circuited with the p-electrode 9 through the aluminum dust layer by the pressure heat treatment. It is preferable that the conductive film is adhered to the n-electrode 8 and an anisotropic conductive film cut to a predetermined length is attached along the p-electrode.

  Also in this case, the conductive particles 31 contained in the anisotropic conductive film 36 break through the insulating layer 22 of the wiring member 20 by pressurizing under a predetermined temperature after the wiring member is arranged. The adjacent solar cells 1 can be electrically connected to each other by the wiring member 20 (see FIG. 7).

  Further, in addition to the method of punching the sealing material into the shape of the electrode or cutting it to a predetermined length, as shown in FIG. 29, the entire region of the solar cell 1 in which the p (n) electrodes 9 and 8 are formed. A sealing material 35 that covers the surface of the solar battery cell may be attached. In this case, when applying pressure to the wiring member 20, the n electrode 8 is included in the anisotropic conductive film 36 by applying pressure only to the portion of the wiring member 20 that contacts the n electrode 8. The conductive particles 31 that break through the insulating layer 22 of the wiring member 20 come into contact with the base material 21 of the wiring member 20, and the adjacent solar cells 1 can be electrically connected by the wiring member 20 (FIG. 7). reference). In particular, according to this method, it is only necessary to attach one sealing material 35 to the solar battery cell 1, and it is possible to electrically connect the solar battery cells 1 to each other by completing the attaching operation in a shorter time. it can.

  In addition, in the manufacturing method of each solar cell module mentioned above, although the case where the joining member was supplied to the electrode of the photovoltaic cell or pasted was described as an example, the joining member was fed to the wiring member or pasted. By doing so, the wiring member and the p (n) electrode may be electrically connected.

  The embodiment disclosed this time is an example, and the present invention is not limited to this. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a top view which shows the basic composition of the solar cell module which concerns on Embodiment 1 of this invention. In the embodiment, it is a top view of the side by which the electrode in a photovoltaic cell is arrange | positioned. FIG. 3 is a cross-sectional view taken along a cross-sectional line III-III shown in FIG. 2 in the same embodiment. In the same embodiment, it is sectional drawing of a wiring member. FIG. 5 is a cross-sectional view taken along a cross-sectional line VV shown in FIG. 1 in the same embodiment. FIG. 6 is a cross-sectional view taken along a cross-sectional line VI-VI shown in FIG. 1 in the same embodiment. In the same embodiment, it is a partial expanded sectional view which shows the connection part of a wiring member and an electrode. It is a perspective view which shows 1 process of the manufacturing method of the solar cell module which concerns on Embodiment 2 of this invention. FIG. 9 is a perspective view showing a step performed after the step shown in FIG. 8 in the same embodiment. FIG. 10 is a perspective view showing a step performed after the step shown in FIG. 9 in the same embodiment. FIG. 11 is a perspective view showing a step performed after the step shown in FIG. 10 in the same embodiment. FIG. 12 is a cross-sectional view showing a step performed after the step shown in FIG. 11 in the same embodiment. FIG. 10 is a cross-sectional view showing a first modification of the wiring member in the embodiment. In the same embodiment, it is sectional drawing which shows the 2nd modification of a wiring member. In the same embodiment, it is sectional drawing which shows the 3rd modification of a wiring member. In the same embodiment, it is sectional drawing which shows the 4th modification of a wiring member. In the same embodiment, it is sectional drawing which shows the 5th modification of a wiring member. It is a fragmentary sectional view which shows the structure of the tape material applied to the solar cell module which concerns on Embodiment 3 of this invention. In the same embodiment, it is a figure which shows the manufacturing flow of a solar cell module. In the same embodiment, it is a perspective view which shows 1 process of the manufacturing method of a solar cell module. FIG. 21 is a perspective view showing a step performed after the step shown in FIG. 20 in the same embodiment. In the same embodiment, it is a figure which shows the variation of the pattern of an electrode and a joining member. It is a top view which shows the sticking aspect of the joining member in the solar cell module which concerns on Embodiment 4 of this invention. In the same embodiment, it is a perspective view which shows 1 process of the manufacturing method of a solar cell module. FIG. 25 is a perspective view showing a step performed after the step shown in FIG. 24 in the same embodiment. FIG. 26 is a perspective view showing a step performed after the step shown in FIG. 25 in the same embodiment. FIG. 27 is a perspective view showing a step performed after the step shown in FIG. 26 in the same embodiment. In the same embodiment, it is a top view which shows one modification of the affixing aspect of the joining member in a solar cell module. In the embodiment, it is a top view which shows the other modification of the affixing mode of the joining member in a solar cell module. It is a top view which shows the 1st example of the conventional solar cell module. FIG. 31 is a cross sectional view taken along a cross sectional line XXXI-XXXI shown in FIG. 30. It is a top view which shows the 2nd example of the conventional solar cell module. FIG. 33 is a cross sectional view taken along a cross sectional line XXXIII-XXXIII shown in FIG. 32. It is a top view which shows the 3rd example of the conventional solar cell module. It is sectional drawing in sectional line XXXV-XXXV shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Solar cell, 2 Semiconductor substrate, 3 Cell p layer, 4 Cell n layer, 5 Through hole, 6 Cell p + layer, 7 Light receiving surface electrode, 8 n electrode, 9 p electrode, 10 Aluminum dust layer, 11 Light receiving surface electrode 12 Solar cell string, 20 Wiring member, 20a, 20b Comb, 21 Base material, 22 Insulating layer, 23 Film material, 30 Joining member, 31 Conductive particle, 33 Anisotropic conductive paste, 35 Tape material, 36 Anisotropic Conductive film, 37, 38 release film, 39 reel, 50 jig, 60 solar cell module, 61 back film, 62 sealing material, 63 glass plate, 64 frame, 65a, 65b external terminals.

Claims (13)

A wiring member connection structure in which a wiring member is electrically connected to a predetermined electrode,
A substrate having a main surface;
An electrode formed on the main surface of the substrate;
A bonding member formed to cover the surface of the electrode;
A wiring member disposed on the joining member and electrically connected to the electrode through the joining member;
Have
The wiring member is
A base material formed of a predetermined conductive material;
An insulating layer including a predetermined insulating material formed on at least a surface of the base material facing the bonding member;
The connection member connection structure, wherein the joining member includes conductive particles that break through the insulating layer of the wiring member and come into contact with the base material. The joining member includes any one of an anisotropic conductive film and an anisotropic conductive paste,
The wiring member connection structure according to claim 1, wherein the conductive particles are included in any of the above.   The conductive material includes at least one of copper (Cu), aluminum (Al), nickel (Ni), gold (Au), silver (Ag), and titanium (Ti). Wiring member connection structure.   The conductive materials include copper (Cu), copper (Cu) / aluminum (Al) / copper (Cu), and copper (Cu) / invar / copper (Cu) coated with solder or silver (Ag). The connection structure for a wiring member according to claim 1, comprising any one of the laminated structures. The substrate is
A predetermined insulating film;
The wiring member connection structure according to claim 1, further comprising a circuit pattern formed of a conductive foil on the insulating film.   The insulating film includes any of polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, and polyvinyl fluoride. Item 6. A wiring member connection structure according to Item 5. The conductive material is copper;
The wiring member connection structure according to claim 1, wherein the insulating material is an oxide film formed on the surface of the copper. The conductive material is aluminum;
The wiring member connection structure according to claim 1, wherein the insulating material is an aluminum oxide film formed on the surface of the aluminum.   The wiring member connection structure according to claim 1, wherein the insulating material includes an insulating organic material or an insulating inorganic material.   The wiring member connection structure according to claim 9, wherein the insulating organic material includes one of polyimide, poly-imide, epoxy, and acrylic.   The wiring member connection structure according to claim 9, wherein the insulating inorganic material includes one of silica and alumina. It is a solar cell module provided with the connection structure of the wiring member in any one of Claims 1-11,
The substrate is a solar cell;
The electrodes are first and second electrodes having different polarities formed in the solar battery cell,
A solar cell module in which a predetermined number of the solar cells are connected in series in a mode in which the wiring member connects the first electrode of one solar cell and the second electrode of another solar cell. Forming a solar cell in which an electrode is disposed;
Supplying a bonding member containing predetermined conductive particles to the surface of the electrode;
Preparing a wiring member coated with a predetermined insulating layer, and arranging the wiring member so as to contact the bonding member;
The electrode and the wiring member are electrically connected to each other through the conductive particles by performing a heat treatment while pressing the wiring member against the solar battery cell in such a manner that the insulating layer is pierced by the conductive particles. The manufacturing method of a solar cell module provided with the process to connect electrically.

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