JP2012094846A - Power collection sheet for solar cell and solar cell module using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power collection sheet for solar cell used for internal wiring of a solar cell module which can prevent short circuit between the P pole, i.e. an element on the non-light receiving surface side, and a wiring part corresponding to the N electrode, and can relax impact.SOLUTION: The power collection sheet 2 for solar cell is arranged on the back side of a back contact solar cell element 1 for internal wiring of a solar cell module. A circuit 22 consisting of a metal wiring part 221 and a non-wiring part 222 is formed on the surface of a resin substrate 21, and a sealing material layer 23 is laminated on the circuit 22. Above the sealing material layer 23 on the wiring part 221, a conduction recess 24 for exposing the wiring part 221 in order to conduct an electrode 4 of the solar cell element 1 on the non-light receiving surface side and a corresponding wiring part 221 via the sealing material layer 23 is formed.

Description

  The present invention relates to a solar cell current collector sheet for taking out electricity from a back contact type solar cell element and a solar cell module using the same.

  In recent years, solar cells as a clean energy source have attracted attention due to the growing awareness of environmental issues. Generally, a solar cell module constituting a solar cell has a configuration in which a transparent front substrate, a front surface side sealing material sheet, a solar cell element, a back side sealing material sheet, and a back surface protection sheet are laminated in order from the light receiving surface side. Yes, it has a function of generating power when sunlight enters the solar cell element.

  A plurality of solar cell elements that generate power inside the solar cell module are usually provided inside the solar cell module, and are configured to obtain necessary voltages and currents by connecting them in series and parallel. . In order to wire a plurality of solar cell elements inside a solar cell module, for example, a solar cell current collector sheet in which a metal foil that becomes a circuit is laminated on the surface of a resin sheet as a base material is used (Patent Literature). 1).

  By the way, the solar cell element includes a light receiving surface for receiving sunlight and a non-light receiving surface located on the back side thereof. In order to increase the light receiving efficiency of the sunlight on the light receiving surface, electrodes are arranged on the light receiving surface. First, a back contact type solar cell element in which a plurality of electrodes having different polarities are arranged on a non-light-receiving surface is known.

  There are various types of back contact solar cell elements. Metal wrap-through (MWT) method or emitter wrap-through (EWT) comprising a semiconductor substrate having a plurality of through-holes penetrating the light-receiving surface and the non-light-receiving surface, and having a plurality of electrodes having different polarities on the non-light-receiving surface In addition to the solar cell element of the type, there is also a solar cell element having a structure having no through hole.

  Here, there is a risk of causing a short circuit between the non-light-receiving surface side element which is the P pole and the wiring portion corresponding to the N electrode, particularly when electricity is directly taken out from the electrode of the solar cell element having a structure having a through hole. .

  Such a short circuit can be prevented by forming an insulating layer on the circuit of the solar cell current collector sheet. Patent Document 2 discloses a solar cell module in which an insulating layer made of an insulating adhesive is formed on a circuit of a solar cell current collector sheet.

  On the other hand, since the solar cell element has been made thinner in recent years, the solar cell element is broken by a slight impact from the outside, or at the junction between the solar cell element and the circuit on the solar cell current collector sheet. Although the above-mentioned insulating adhesive is usually a curable resin by heat, UV, etc., the cured insulating layer has no impact resistance, and the insulating layer alone is not from the outside. The effect of mitigating impact cannot be sought.

JP 2007-081237 A JP 2010-157553 A

  For this reason, there is a need for a solar cell current collector sheet that can safely extract electricity from a back-contact solar cell element without causing a short circuit and that can sufficiently mitigate external impacts. It was.

  The present invention has been made in view of the above situation, and is a solar cell current collector sheet bonded to a back contact type solar cell element, which is a P-pole non-light-receiving surface side element and N A solar cell current collector sheet that can reliably prevent a short circuit with the wiring portion corresponding to the electrode and can sufficiently mitigate external impact on the solar cell element and the junction between the solar cell element and the circuit. It is another object of the present invention to provide a manufacturing method thereof.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors formed an encapsulant (filler) layer on the circuit of the solar cell current collector sheet, thereby impacting the encapsulant layer. It was found that in addition to the original effect of relaxation, an effect as an insulating layer is also required. Then, the solar cell current collector sheet having the above-described configuration having a sealing material layer can prevent the above-described short circuit, and can also sufficiently reduce the external impact, thereby completing the present invention. It came to do. Specifically, the present invention provides the following.

  (1) The present invention is arranged on the back side of a back contact type solar cell element for internal wiring in a solar cell module, is formed on the surface of a resin base material, and includes a wiring portion made of metal and a non-wiring portion. A circuit and a sealing material layer laminated on the circuit, and the sealing material layer on the wiring portion includes an electrode on the non-light-receiving surface side of the solar cell element via the sealing material layer The solar cell current collector sheet is characterized in that a conductive recess is formed through which the wiring portion is exposed in order to conduct the wiring portion corresponding thereto.

  (2) Moreover, this invention is the said conduction | electrical_connection recessed part corresponding to the negative electrode position formed in the non-light-receiving surface side through a through hole from the light-receiving surface side element of the said solar cell element, and the said solar It is a current collection sheet for solar cells as described in (1) provided with the 2nd conduction | electrical_connection recessed part corresponding to the positive electrode position of the non-light-receiving surface side element of a battery element.

(3) Moreover, this invention is a collector sheet for solar cells as described in (1) or (2) whose volume resistance value measured by JISC6481 of the said sealing material layer is 10 < ⁷ > (ohm) or more.

  (4) Moreover, this invention is a collector sheet for solar cells as described in any one of (1) to (3) whose said sealing material layer is a polyethylene-type resin or an ionomer.

  (5) Moreover, this invention is a collector sheet for solar cell integrated with a back surface protection sheet according to any one of (1) to (4), in which a back surface protection sheet is integrated on the back surface side of the resin base material. .

  (6) Moreover, this invention is a manufacturing method of the current collection sheet | seat for solar cells in any one of (1) to (5), Comprising: After laminating | stacking metal foil on the surface of a resin base material, the said metal foil is used. A step of forming a circuit by etching, and a step of forming a through hole forming the conductive recess in the encapsulant layer and laminating the encapsulant layer on the circuit. It is a manufacturing method of a sheet.

  (7) Moreover, this invention is a solar provided with the joining member by which the collector sheet for solar cells in any one of (2) to (5) is laminated | stacked on the non-light-receiving surface side of a back contact type solar cell element. A battery module, wherein the solar cell element comprises a light receiving surface side element and a non-light receiving surface side element, a negative electrode formed on the non light receiving surface side through a through hole from the light receiving surface side element, and the non-light receiving surface A positive electrode formed on the surface-side element, the conductive recess of the solar cell current collector sheet is filled with a conductive material, and the negative electrode and the conductive in the first conductive recess The solar cell module is joined so that the conductive material is conductive, and is joined so that the positive electrode and the conductive material in the second conductive recess are conductive.

  (8) Moreover, this invention is formed in the surface of a resin base material, the circuit which consists of the wiring part which consists of a metal, and a non-wiring part, the sealing material layer laminated | stacked on the said circuit, and the said sealing material And a back contact type solar cell element laminated on the layer.

  According to the present invention, a solar cell current collector sheet joined to a back contact solar cell element, wherein a short circuit between a non-light-receiving surface side element that is a P pole and a wiring portion corresponding to an N electrode is provided. Provided are a solar cell current collector sheet and a method for producing the same, which can surely prevent and sufficiently mitigate external impact on solar electronic elements and the like.

It is the perspective view which represented typically the back contact type solar cell element which has a through hole. It is sectional drawing which follows the XX line of FIG. It is the perspective view which represented typically the joining member of the solar cell element and the collector sheet for solar cells of this invention. It is sectional drawing which follows the YY line | wire in the state before joining of the solar cell element and the collector sheet for solar cells of the joining member of FIG. It is sectional drawing which follows the YY line in the state after joining of the solar cell element of the joining member of FIG. 3, and the collector sheet for solar cells.

  Hereinafter, one embodiment of the current collector sheet for solar cells of the present invention and one embodiment of the method for producing the current collector sheet for solar cells of the present invention will be described.

  First, a back contact solar cell element 1 having a through hole used in an embodiment of the solar cell current collector sheet of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view schematically showing the solar cell element 1. 2 is a cross-sectional view taken along line XX of FIG.

  A solar cell element 1 used in the present embodiment includes an N-pole light-receiving surface side element 11 and a P-pole non-light-receiving surface side element 12 that are stacked one above the other. The light-receiving surface side element 11 and the non-light-receiving surface side element 12, a negative electrode 41 formed on the non-light-receiving surface side element 12 through the through-hole 13 from the light-receiving surface side element 11, and a positive electrode formed on the non-light-receiving surface side element 12. An electrode 42.

  As an example of the back contact type solar cell element 1 having the through hole 13 used in the present embodiment, a metal wrap through (MWT) type or an emitter wrap through (EWT) type solar cell element can be cited. The solar cell element of the MWT system is a structure in which a metal such as silver paste 14 is filled in the through hole 13 of the solar cell element 1 and the power collected on the light receiving surface through the metal is taken out from the negative electrode 41 on the non-light receiving surface side. The solar cell element. The EWT solar cell element is a solar cell element having a structure in which a diffusion layer is provided on the inner wall of the through hole 13 of the solar cell element 1 and the power collected on the light receiving surface through the diffusion layer is taken out from the negative electrode 41 on the non-light receiving surface side. Say.

  With reference to FIGS. 3 to 5, an embodiment of the solar cell current collector sheet 2 of the present invention will be described. FIG. 3 is a perspective view schematically showing the joining member 3 of the back contact solar cell element 1 having the through hole 13 and the solar cell current collector sheet 2 of the present invention. FIG. 4 is a cross-sectional view of the bonding member 3 of FIG. 3 taken along line YY in a state before the solar cell element 1 and the solar cell current collector sheet 2 are bonded. FIG. 5 is a cross-sectional view of the bonding member 3 of FIG. 3 taken along line YY in a state after the solar cell element 1 and the solar cell current collector sheet 2 are bonded.

<Current collector sheet for solar cell>
The solar cell current collector sheet 2 of this embodiment includes a resin base material 21, a circuit 22, a sealing material layer 23, and a conductive recess 24 formed in a part of the sealing material layer 23. On the surface of the resin base 21, a wiring part 221 made of a metal such as copper and a circuit 22 made up of a non-wiring part 222 are formed. A sealing material layer 23 is formed so as to cover the circuit 22. In addition, a conductive recess 24 that penetrates from the upper surface of the sealing material layer 23 to the upper surface of the circuit 22 is formed.

  The resin base material 21 is a resin molded into a sheet shape. Here, the sheet form is a concept including a film form, and there is no difference between them in the present invention. Examples of the resin constituting the resin substrate 21 include polyethylene resin, polypropylene resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polyvinyl chloride resin, Fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide resins such as various nylons, polyimide resins, polyamideimide resins Examples thereof include resins, polyaryl phthalate resins, silicone resins, polysulfone resins, polyphenylene sulfide resins, polyether sulfone resins, polyurethane resins, acetal resins, and cellulose resins.

  What is necessary is just to set the thickness of the resin base material 21 suitably according to the intensity | strength, thinness, etc. which are requested | required of the collector sheet 2 for solar cells. Although the thickness of the resin base material 21 is not specifically limited, 20-250 micrometers is mentioned as an example.

  The circuit 22 is an electrical wiring formed on the surface of the solar cell current collector sheet 2 so as to have a desired wiring shape. The wiring portion 221 of the circuit 22 is a layer made of a metal such as copper. In order to form the circuit 22 on the surface of the resin base material 21, a method of bonding a copper foil to the surface of the resin base material 21, and then patterning the copper foil by etching or the like is exemplified.

  What is necessary is just to set the thickness of the circuit 22 suitably according to the magnitude | size of the electric current resistance requested | required of the collector sheet 2 for solar cells. Although the thickness of the circuit 22 is not particularly limited, an example is 10 to 50 μm.

  As shown in FIG. 5, the sealing material layer 23 is formed on the circuit 22 except for the place occupied by the conductive recess 24. The sealing material layer in the present invention is also referred to as a filler, and is, for example, an olefin-based resin base disposed in the solar cell module to fix the position of the solar cell element and to reduce external impact. A layer made of a filler such as a material.

  Examples of the sealing material include conventionally known ethylene-vinyl acetate copolymer resins (EVA), ionomers, polyvinyl butyral (PVB), and olefin resins such as polyethylene. These are all in terms of impact relaxation characteristics. It has characteristics that can sufficiently mitigate external impacts.

Here, in a conventional solar cell current collector sheet provided with an insulating layer made of, for example, thermosetting insulating ink on a circuit, a non-light-receiving surface side element which is a P pole and a wiring portion corresponding to an N electrode In order to prevent a short circuit between them, the insulating layer is required to have a volume resistance value measured by JIS C6481 of 10 ⁷ Ω or more, preferably 10 ¹¹ Ω or more. The solar cell current collector sheet according to this example causes the encapsulant layer 23 to also play the role of the insulating layer, and the resistance value of the encapsulant layer 23 satisfies the condition of the volume resistance value. By satisfying, the short circuit can be prevented.

  Samples were prepared for EVA and olefin-based resin used as the sealing material layer 23, respectively, and an insulation test was performed as described below.

  The test about insulation was performed by measuring the volume resistance value of the following sample according to JIS C6481. As a measuring instrument, a super insulation meter (manufactured by Hioki Electric Co., Ltd .: model number SM-8215) was used. For the sample, an olefin-based resin described in JP-A-2003-46105 and an EVA resin having a VA content of 28% were used, and the thickness of each sample was 400 μm. The results are shown in Table 1.

  From Table 1, it turns out that the sealing material layer 23 using EVA and olefin resin has sufficient insulation to prevent the short circuit in the current collector sheet for solar cells.

  The sealing material layer 23 is preferably excellent in metal adhesion with the copper foil or the like forming the wiring part 221 on the circuit 22 in addition to having the above-described impact relaxation characteristics and insulation. From this viewpoint, an ionomer excellent in metal adhesion can be preferably used as the sealing material layer 23. In addition, olefin-based resins can also improve metal adhesion by blending a tackifier (tackifier), modifying a part of the polyethylene resin with silane, or blending a silane coupling agent. Therefore, it can be preferably used as the sealing material layer 23. From the above, it is particularly preferable to use a polyethylene resin or an ionomer as the sealing material layer 23.

  The thickness of the sealing material layer 23 is preferably 100 μm or more and 600 μm or less, and if it is less than 100 μm, it is not preferable because the impact cannot be sufficiently mitigated and the insulating property becomes insufficient. Further, if the thickness exceeds 600 μm, no further effect is obtained, and it is rather undesirable because it is difficult to form the pattern of the conductive recess 24 and it is uneconomical.

  The color of the sealing material layer 23 is not particularly limited. The material resin is not particularly colored and may remain colorless and translucent, or may be colored in any color. For example, by coloring to a color having a high light reflectance such as white, it is possible to reflect incident light and contribute to improving the power generation efficiency of the solar cell module, and by coloring to white or black, The designability of the solar cell module can also be improved.

  As shown in FIGS. 4 and 5, the conductive recess 24 is a first conductive recess formed immediately below the negative electrode 41 of the solar cell element 1 when the solar cell element 1 and the solar cell current collector sheet 2 are joined. 241 and a second conductive recess 242 formed immediately below the positive electrode 42 of the solar cell element 1. The first conductive recess 241 has a shape and an area in plan view as viewed from the upper surface side of the solar cell element and is substantially the same as the through hole 13, and is a hole penetrating from the upper surface portion of the sealing material layer 23 to the upper surface of the wiring portion 221. is there. On the other hand, the second conductive recess 242 is also a hole that penetrates from the upper surface portion of the sealing material layer 23 to the upper surface of the wiring portion 221, and the shape and area thereof may be joined to the positive electrode 42. It is designed appropriately according to the shape position.

  At the time of joining the solar cell element 1 and the solar cell current collector sheet 2, the first conductive recess 241 is formed at a position overlapping the corresponding through hole 13 with the negative electrode 41 interposed therebetween, and the second conductive recess 241. 242 is formed at a position overlapping the corresponding through hole 13 with the positive electrode 42 interposed therebetween. The space between the first conductive recess 241 and the second conductive recess 242 is filled with a conductive material 25 such as solder.

  As described above, any of the sealing material layers in the present invention can sufficiently relieve an impact from the outside due to the impact relieving characteristics which are conventionally known characteristics. Further, in addition to the impact mitigation effect that is a known effect of the conventional sealing material layer, the conventional sealing material layer in the present invention has sufficient insulation to prevent the short circuit, which has not been conventionally considered. New effects can be exhibited. Therefore, according to the solar cell current collector sheet of the present invention, for example, there is no need for a multilayer structure in which an insulating layer is first formed on a circuit and then a sealing material layer is formed on the insulating layer. Since only the sealing material layer plays the role of impact relaxation and insulation, the number of materials and processes in the production process can be reduced, which can contribute to the improvement of productivity.

<Method for producing solar battery collector sheet>
In the manufacturing method of the solar cell current collector sheet 2 of the present embodiment, a laminated sheet in which a conductive layer made of a metal such as copper is first laminated on the surface of the resin base material 21 is used. By performing an etching process and a peeling process on the laminated sheet, a circuit 22 is formed on the solar cell current collector sheet 2. Furthermore, the sealing material layer 23 is formed on the circuit 22 by performing the sealing material lamination process with respect to the lamination sheet in which the circuit 22 was formed. Hereinafter, an etching process, a peeling process, and a sealing material lamination process are demonstrated.

[Etching process]
First, the etching process will be described. In this process, an etching mask (not shown) patterned in the shape of a desired circuit 22 is formed on the surface of the laminated sheet, and then an etching process is performed, so that the conductivity in a portion not covered with the etching mask is obtained. A step of removing the layer.

  As already described, the laminated sheet used in this step is one in which a conductive layer made of a metal such as copper is formed on the surface of the resin base material 21. About the method of forming the conductive layer which consists of metals, such as copper, on the surface of the resin base material 21, the method of adhere | attaching copper foil on the surface of the resin base material 21 with an adhesive agent, and vapor-depositing copper foil on the surface of the resin base material 21 Although the method of making it etc. is illustrated, the method of adhere | attaching copper foil on the surface of the resin base material 21 with an adhesive agent is advantageous from the surface of cost. Among these, a method of adhering the copper foil to the surface of the resin substrate 21 by a dry laminating method using an adhesive such as urethane, polycarbonate, or epoxy is preferable.

  In this step, first, an etching mask (not shown) patterned in the shape of a desired wiring portion 221 is formed on the surface of the laminated sheet (that is, the surface of the conductive layer). In the etching process, the etching mask is provided so that the conductive layer to be the wiring portion 221 is free from corrosion by the immersion liquid in the future. The method for forming such an etching mask is not particularly limited. For example, the etching mask may be formed on the surface of the laminated sheet by developing a photoresist or a dry film after exposure through the photomask, An etching mask may be formed on the surface of the laminated sheet by a printing technique such as an inkjet printer. The etching mask needs to be able to be stripped with an alkaline stripping solution in a stripping step described later. From such a viewpoint, it is preferable to produce an etching mask using a photoresist or a dry film.

  Next, the etching process in an etching process is demonstrated. This process is a process of removing the conductive layer in a portion not covered with the etching mask with an immersion liquid. Through this treatment, the conductive layer is removed from the conductive layer except for the portion to be the wiring part 221, so that the conductive layer remains in the desired shape of the wiring part 221 on the surface of the resin base material 21. become.

[Peeling process]
Next, the etching mask is removed using an alkaline stripping solution in the stripping step. Through this step, the etching mask is removed from the surface of the wiring portion 221. Examples of the alkaline stripping solution used in the stripping step include an aqueous solution of caustic soda having a predetermined concentration.

[Sealing material lamination process]
The method for forming the sealing material layer 23 is not particularly limited. For example, after forming the sealing material in a sheet shape, a through hole is formed in advance at a position where the conductive recess 24 is formed, and then laminated. A conductive recess 24 penetrating on the circuit 22 can be formed.

  According to the above manufacturing method, at the stage where the sheet-like sealing material is laminated on the circuit, strictly, the sealing material layer 23 may not be formed on the non-wiring portion 222 as shown in FIG. . However, in the process of vacuum thermal laminating in the manufacturing process of the solar cell module described later, the softened sealing material flows into the non-wiring part 222 due to the heat related to the processing, and as shown in FIG. Also, the sealing material layer 23 is formed.

<Method for manufacturing solar cell module>
Next, the manufacturing method of a solar cell module provided with the junction member 3 which joined the current collector sheet 2 for solar cells and the solar cell element 1 which are one Embodiment of this invention is demonstrated.

  As shown in FIG. 5, before the step of integrating the solar cell current collector sheet 2, the solar cell element 1 and other members, first, a conductive material 25 is applied to the conductive recess 24 of the solar cell current collector sheet 2. Fill. Examples of the conductive material 25 include solder. Thereby, since the conductive recess 24 is formed so that the wiring part 221 is exposed on the bottom surface, the conductive material 25 and the wiring part 221 are electrically connected. More specifically, in FIG. 5, the first conductive recess 241 connected to the wiring portion 221 and the P pole and the second conductive recess 242 connected to the wiring portion 221 and the N pole are respectively the sealing material layer 23. Are conducted separately.

  On the one solar cell element 1 side, a back contact type solar cell element such as an MWT type solar cell element shown in FIG. 5 or an EWT type solar cell element is used. In the case of an MWT solar cell element, the through hole 13 is filled with a silver paste 14 as shown in FIG.

  Next, the solar cell current collector sheet 2, the solar cell element 1, and other members such as a back surface protection sheet (not shown) are laminated and integrated. An example of this integration method is a method of integration by vacuum heat lamination. The laminating temperature when using the above method is preferably in the range of 130 ° C to 190 ° C. The laminating time is preferably in the range of 5 to 60 minutes, particularly preferably in the range of 8 to 40 minutes.

  In this integration process, the encapsulant layer 23 of the solar cell current collector sheet 2 is softened by heating and flows into the non-wiring portion 222, and is also sealed into the non-wiring portion 222 as shown in FIG. The material layer 23 will be formed. Thereby, the sealing material layer 23 can function as an insulating layer that prevents a short circuit between the electrodes.

  Further, in this integration process, the resin base material 21 of the solar cell current collector sheet 2 is firmly integrated with other members as a solar cell module. Even when heated above the Tg of the resin, there is no problem of shrinkage or deformation due to heat.

  The solar cell current collector sheet 2 of the present invention is a sheet in which the sealing material layer 23 is laminated on the circuit 22. The solar cell module of the present invention is previously sealed on the circuit 22. The material layer 23 is not limited to being laminated. A circuit formed on the surface of a resin base material, which includes a wiring portion made of metal and a non-wiring portion, a sealing material layer laminated on the circuit, and a back contact type laminated on the sealing material layer A solar cell module including the solar cell element is within the scope of the present invention.

  Due to the above integration, as shown in FIG. 4, electricity taken out from the negative electrode 41 corresponds through the silver paste 14 in the through hole 13 and further through the conductive material 25 in the first conduction recess 241. Conducted to the wiring part 221. Further, the electricity taken out from the positive electrode 42 can be conducted to the corresponding wiring part 221 through the conductive material 25 in the second conduction recess 242.

<Other Examples of Current Collection Sheet for Solar Cell>
As described above, the solar cell current collector sheet 2 becomes a solar cell module through a process of integrating with other members in addition to the solar cell element 1, but prior to the process, the back side of the resin base material 21. It is also possible to obtain a back surface protection sheet integrated sheet used for manufacturing a solar cell module by previously integrating another back surface protection sheet (not shown) such as ETFE or water resistant PET.

  In order to prepare the above-mentioned back surface protection sheet integrated sheet, a back surface protection sheet is laminated on the back surface side of the resin base material 21 by a dry lamination method or the like.

  As described above, the solar cell current collector sheet 2 of the present invention insulates between the non-light-receiving surface side element 12 as the P pole and the wiring portion corresponding to the N electrode when bonded to the solar cell element 1. And a sealing material layer 23 that can alleviate the impact on the solar cell element 1 and the like from the outside. 2 can prevent a short circuit between the non-light-receiving surface side element 12 which is the P pole and the wiring portion corresponding to the N electrode, and at the same time, the solar cell element 1 and the like can be appropriately applied by external impact. Can be protected.

DESCRIPTION OF SYMBOLS 1 Solar cell element 13 Through hole 2 Current collector sheet for solar cells 21 Resin base material 22 Circuit 23 Sealing material layer 24 Conductive recessed part 3 Joining member of a solar cell element and the current collector sheet for solar cells 4 Electrode 41 Negative electrode 42 Positive electrode

Claims (8)

Arranged on the back side of the back contact solar cell element for internal wiring in the solar cell module,
Formed on the surface of the resin base material, a circuit composed of a wiring portion made of metal and a non-wiring portion;
A sealing material layer laminated on the circuit,
In order to electrically connect the electrode on the non-light-receiving surface side of the solar cell element and the corresponding wiring part to the sealing material layer on the wiring part via the sealing material layer. A current collecting sheet for a solar cell, wherein a conductive recess is formed through which is exposed. As the conduction recess,
A first conductive recess corresponding to a negative electrode position formed on the non-light-receiving surface side through a through hole from the light-receiving surface side element of the solar cell element;
A second conductive recess corresponding to the positive electrode position of the non-light-receiving surface side element of the solar cell element;
The solar cell current collector sheet according to claim 1, comprising: The current collector sheet for solar cells according to claim 1 or 2, wherein the sealing material layer has a volume resistance value measured by JIS C6481 of 10 ⁷ Ω or more.   The solar cell current collector sheet according to claim 1, wherein the sealing material layer is a polyethylene resin or an ionomer.   The current collector sheet for solar cell integrated with a back surface protection sheet according to any one of claims 1 to 4, wherein a back surface protection sheet is integrated with the back surface side of the resin base material. It is a manufacturing method of the current collection sheet for solar cells in any one of Claim 1 to 5,
After laminating the metal foil on the surface of the resin substrate, etching the metal foil to form a circuit;
Forming a through hole constituting the conductive recess in the sealing material layer and laminating the sealing material layer on the circuit;
A method for producing a solar cell current collector sheet. The solar cell current collector sheet according to any one of claims 2 to 5, wherein the solar cell current collector sheet is a solar cell module comprising a bonding member laminated on the non-light-receiving surface side of the back contact solar cell element,
The solar cell element is composed of a light receiving surface side element and a non-light receiving surface side element, and is formed on the non-light receiving surface side element from the light receiving surface side element through a through hole and formed on the non light receiving surface side. A positive electrode,
The conductive recess of the solar cell current collector sheet is filled with a conductive material,
The negative electrode and the conductive material in the first conductive recess are joined so as to conduct,
The solar cell module joined so that the said positive electrode and the electroconductive material in the said 2nd conduction | electrical_connection recessed part may conduct | electrically_connect. A circuit formed on the surface of the resin base material, which is composed of a metal wiring portion and a non-wiring portion;
A sealing material layer laminated on the circuit;
A back contact type solar cell element laminated on the sealing material layer.

Images