JP2014112734A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module improved in power generation amount per unit area and a method of manufacturing the same.SOLUTION: On a projection plane parallel to a rear surface of a solar cell module (100), a third conductive part (4c) has an extension part in a direction opposite to a second conductive part (4b) with respect to a first conductive part (4a), a first extraction wiring part (10a) is connected to the extension part, and the first conductive part (4a) and the second conductive part (4b) are arranged apart from the first extraction wiring part (10a) at the boundary between a power generation region and a non-power generation region.

Description

  The present invention relates to a solar cell module including a power generation region and an extraction wiring for taking out power from the power generation region.

  Solar cells are expected as new energy sources because they directly convert clean and inexhaustible sunlight into electricity.

  Since the output per solar cell is about several watts, when a solar cell is used as a power source (energy source) for a house or a building, a solar cell module in which a plurality of solar cells are arranged is used. .

  Generally, a solar cell module includes a power generation region formed by arranging a plurality of solar cells, and a pair of positive and negative extraction wirings that are connected to the power generation region and extract electric power from the power generation region to the outside.

  Here, as a conventional solar cell module, a solar cell module in which an extraction wiring is arranged along the outer periphery of a power generation region is known (for example, see Patent Document 1). In such a solar cell module, one terminal box is disposed on the back surface of the solar cell module. Each of the pair of positive and negative lead wires is routed along the outer periphery of the power generation region from the position connected to the power generation region to the position where it can be easily pulled out to the terminal box.

JP 2006-278904 A

  However, the region where the lead-out wiring is routed along the outer periphery of the power generation region forms a non-power generation region that does not contribute to power generation. As a result, the ratio of the area of the power generation region to the total area of the solar cell module decreases, and the amount of power generation per unit area of the solar cell module decreases.

  Thus, in the conventional solar cell module, there was room for improvement in the improvement of the power generation amount per unit area.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a solar cell module with improved power generation per unit area and a method for manufacturing the same.

A first feature of the present invention is a power generation region that has a light receiving surface that receives light and a back surface opposite to the light receiving surface, and generates power by receiving light, and a non-power generation formed outside the power generation region A solar cell module comprising a region and an extraction wiring for taking out the electric power generated by the power generation region to the outside of the solar cell module, wherein the power generation region is configured by arranging a plurality of solar cells according to a first direction, respectively. A plurality of solar cell groups formed, wherein the plurality of solar cell groups are arranged according to a second direction substantially orthogonal to the first direction, and the extraction wiring is included in the plurality of solar cell groups Electrically connected to the extraction solar cell group via a conductive material, the conductive material is connected to the extraction solar cell group and extends to the non-power generation region, and the extraction wiring is connected to the non-power generation region. In the projection plane parallel to the main surface of the solar cell module, the extraction wiring is electrically connected within the non-power generation region. The gist of the present invention is to have a first extraction wiring portion provided along the material and a second extraction wiring portion provided continuously to the first extraction wiring portion in the power generation region.

  As described above, the extraction wiring extends from the position connected to the conductive material in the non-power generation region to the back surface of the power generation region. That is, the lead-out wiring is not routed outside the power generation area. Therefore, the ratio of the area of the power generation region to the area of the solar cell module can be increased. As a result, the amount of power generation per unit area of the solar cell module can be improved.

  1st characteristic of this invention WHEREIN: The solar cell group connection member which electrically connects the 1st solar cell group and 2nd solar cell group which are contained in these solar cell groups is further provided, The said solar cell group connection The member is provided in the non-power generation region, the width of the extraction wiring is larger than the width of the solar cell group connection member, and the thickness of the extraction wiring is larger than the thickness of the solar cell group connection member Small is preferable.

  1st characteristic of this invention WHEREIN: The said electrically-conductive material is located in a line with the said 1st electroconductive part in the said 1st electroconductive part which is electrically connected to the said extraction solar cell group, and extends to the said non-electric power generation area | region. And a second conductive portion that is electrically connected to the take-out solar cell group and extends to the non-power generation region, and electrically connects the first conductive portion and the second conductive portion in the non-power generation region. A third conductive portion, wherein the extraction wiring is connected to the third conductive portion, and the extraction wiring is connected to the power generation region and the non-power generation on a projection plane parallel to a main surface of the solar cell module. It is preferable that the first conductive portion and the second conductive portion do not intersect at the boundary with the region.

  In the first feature of the present invention, it is preferable that the second extraction wiring portion does not intersect the boundary between the power generation region and the non-power generation region on a projection plane parallel to the main surface of the solar cell module.

  In the first feature of the present invention, it is preferable that a cushioning material is disposed between the second extraction wiring portion and at least a part of the power generation region.

  In the first aspect of the present invention, it is preferable that at least a part of the second extraction wiring portion is subjected to an insulation treatment.

  A second feature of the present invention relates to the first feature of the present invention, and is a first wiring member that electrically connects the first solar cell group and the solar cell group connection member, and the second solar cell. A second wiring member for electrically connecting a group and the solar cell group connecting member; and a bypass diode connecting wire electrically connected to the solar cell group connecting member; Extends from the position connected to the solar cell group connection member to the back surface of the power generation region, and on the projection plane parallel to the main surface of the solar cell module, the bypass diode connection wiring is the non-power generation A first bypass diode connecting wiring portion provided along the first wiring material and the second wiring material in the region, and a first bypass diode connecting wiring portion provided in the power generation region. And summarized in that and a second bypass diode connecting interconnection section.

  In the second feature of the present invention, the width of the bypass diode connection wiring is larger than the width of the solar cell group connection member, and the thickness of the bypass diode connection wiring is larger than the thickness of the solar cell group connection member. Is preferably small.

  In the second feature of the present invention, it is preferable that the second extraction wiring portion and the second bypass diode connection wiring portion do not intersect on a projection plane parallel to the main surface of the solar cell module.

  In the second feature of the present invention, the second bypass diode connecting wiring portion does not intersect the boundary between the power generation region and the non-power generation region on a projection plane parallel to the main surface of the solar cell module. preferable.

  In the second feature of the present invention, it is preferable that a buffer material is disposed between the second bypass diode connecting wiring portion and at least a part of the power generation region.

  In the second feature of the present invention, it is preferable that at least a part of the second bypass diode connecting wiring portion is subjected to insulation treatment.

  The third feature of the present invention is that a step A for forming a plurality of solar cell groups each having a plurality of solar cells arranged in the first direction, and a removal solar cell group included in the plurality of solar cell groups A step B for electrically connecting a conductive material extending outside the solar cell group, and a light receiving surface for receiving light by arranging the plurality of solar cell groups in a second direction substantially orthogonal to the first direction; A power generation region that has a back surface opposite to the light receiving surface and generates electric power by receiving light; and an extraction wiring that takes out the electric power generated by the power generation region to the outside of the solar cell module. A step D of electrically connecting to the conductive material outside the region, wherein in the step D, the lead-out wiring extends to the back surface of the power generation region and is parallel to the main surface of the solar cell module. On the projection plane, the lead-out wiring includes a first lead-out wiring portion provided along the conductive material outside the power generation region, and a second lead provided in the power generation region and connected to the first lead-out wiring portion. The gist is to have a lead-out wiring section.

  In the third aspect of the present invention, in the step A, each of the plurality of solar cells is further provided on the opposite side of the first main surface and the first main surface on which electrodes having different polarities are formed. Each of the plurality of solar cells is arranged such that electrodes of the same polarity face the same direction, and in the step B, further included in the plurality of solar cell groups The first wiring member is electrically connected to the first solar cell located at one end of the first solar cell group so as to extend to the outside of the first solar cell group, and is included in the plurality of solar cell groups. A second wiring member is electrically connected to the second solar cell located at one end of the second solar cell group so as to extend to the outside of the second solar cell group. On the outside, the first solar cell group and the A solar cell group connection member for electrically connecting two solar cell groups is electrically connected to the first wiring material and the second wiring material, and in the step B, a part of the first wiring material Is summarized in that it is bent in the thickness direction of the first solar cell along the side surface of the first solar cell.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module which improved the electric power generation amount per unit area, and its manufacturing method can be provided.

It is a top view of the solar cell module 100 which concerns on embodiment of this invention. It is a back view of the solar cell module 100 which concerns on embodiment of this invention. It is a side view of the solar cell module 100 which concerns on embodiment of this invention. FIG. 3 is an enlarged view of the vicinity of solar cells C11 to C41 in FIG. 2. It is sectional drawing in the CC cut surface of FIG. FIG. 6A is a cross-sectional view for explaining the shape of the wiring member 2 connected to the solar cell C21. FIG. 6B is a cross-sectional view for explaining the shape of the wiring member 2 connected to the solar cell C31. 3 is a cross-sectional view for explaining a solar cell group connection member 1 connected to a wiring member 2. FIG. It is a back view of the solar cell module 100 which concerns on the modification of embodiment of this invention. FIG. 6 is a diagram showing another wiring configuration of the conductive material 4 and the extraction wiring 10.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Configuration of solar cell module)
Below, the structure which shows an example of the solar cell module 100 which concerns on embodiment of this invention is demonstrated, referring FIG.1 and FIG.2. FIG. 1 is a plan view showing the configuration of the solar cell module 100. FIG. 2 is a back view showing the configuration of the solar cell module 100.

  The solar cell module 100 according to the present embodiment is connected to the power generation region X, the non-power generation region Y, the extraction wirings 10 and 11 that extract the power generated by the power generation region X to the outside of the solar cell module 100, and the bypass diode. Bypass diode connection wirings 20 and 21.

  The power generation region X includes eight solar cell groups G1 to G8 that are formed by arranging five solar cells C in the first direction. That is, the power generation region X is formed by arranging the solar cells C in an 8 × 5 matrix. Solar cell C has a light-receiving surface that receives light and a back surface provided on the opposite side of the light-receiving surface, and generates power by receiving light. Therefore, the power generation region X formed by arranging the solar cells C in an 8 × 5 matrix has a light receiving surface and a back surface in the same manner, and generates power by receiving light.

  The solar cell groups G1 to G8 are arranged side by side in a second direction substantially orthogonal to the first direction in which the solar cells C are arranged. The solar cell groups G adjacent to each other in the second direction are electrically connected in series by the solar cell group connection member 1. The number of solar cell group connection members 1 is seven. Each of the seven solar cell group connection members 1 is provided in the non-power generation region Y, and is electrically connected to two adjacent solar cell groups via the wiring member 2. A bypass diode connection wiring 20 is electrically connected to the solar cell group connection member 1. The wiring configuration of the solar cell group connecting member 1, the wiring member 2, and the bypass diode connecting wiring 20 will be described later.

  Each of the solar cell groups G1 to G8 includes five solar cells C and a solar cell connection member 3 that electrically connects the five solar cells C arranged in the first direction in series.

  Here, as shown in FIGS. 1 and 2, in the power generation region X, the solar cell groups G <b> 1 and G <b> 8 located at both ends in the second direction are provided with a pair of positive and negative lead wires 10 through the conductive material 4, 11 is electrically connected. Therefore, in this embodiment, the solar cell groups G1 and G2 are referred to as take-out solar cell groups G1 and G8.

  The extraction solar cell group G1 includes solar cells C11 to C15, and the extraction solar cell group G8 includes solar cells C81 to C85. Similarly, the other solar cell groups G2 to G7 include solar cells C21 to C25, solar cells C31 to C35, ..., solar cells C71 to C75, respectively.

  First, the extraction solar cell group G1 will be described. The five solar cells C11 to C15 included in the extraction solar cell group G1 are arranged in order along the first direction. Each of the solar cells C11 to C15 includes a photoelectric conversion unit that generates a photogenerated carrier by receiving light on the light receiving surface, and a pair of positive and negative electrodes for taking out the photogenerated carrier generated by the photoelectric conversion unit. Solar cells C11 to C15 are provided with electrodes having different polarities on the light receiving surface and the back surface, respectively. Moreover, the solar cells C adjacent to each other are arranged such that electrodes having the same polarity face the same direction.

  The solar cell connecting member 3 electrically connects an electrode provided on the light receiving surface of one solar cell C and an electrode provided on the back surface of another solar cell C adjacent to the one solar cell. As described above, the electrodes provided on the light receiving surface of one solar cell C and the electrodes provided on the back surface of another solar cell C adjacent to one solar cell C are different from each other. Two adjacent solar cells C are electrically connected in series by the solar cell connecting member 3. The number of solar cell connecting members 3 is four.

  An extraction wiring 10 is electrically connected to the extraction solar cell group G <b> 1 through the conductive material 4. The conductive material 4 is connected to the extraction solar cell group G1 and extends to the non-power generation region Y. Specifically, the conductive material 4 is connected to the solar cell C11 located at one end in the first direction of the extraction solar cell group G1, and extends into the non-power generation region Y along the first direction. The wiring configuration between the conductive material 4 and the extraction wiring 10 will be described later. In addition, the solar cell group connection member 1 is electrically connected to the solar cell C15 located at the other end in the first direction of the extraction solar cell group G1 via the wiring member 2.

  Next, the extraction solar cell group G8 includes five solar cells C81 to C85 and four solar cell connection members 3, and has the same configuration as the extraction solar cell group G1. Therefore, the extraction wiring 11 is electrically connected to the extraction solar cell G8 through the conductive material 4. The extraction wiring 11 has a polarity different from that of the extraction wiring 10.

  The other solar cell groups G2 to G7 each include five solar cells C and four solar cell connection members 3, and have the same configuration as the above-described extraction solar cell groups G1 and G8. The difference is that the solar cell group connection member 1 is electrically connected to the solar cells C located at both ends in the first direction of the solar cell groups G2 to G7 via the wiring member 2.

  Here, in the present embodiment, electrodes having different polarities are provided on the light receiving surfaces and the back surfaces of all the solar cells C, and the electrodes having the same polarity are arranged so as to face the same direction.

  FIG. 3 shows a side view of the solar cell module 100 having the above configuration. As shown in the figure, the solar cell module 100 includes a plurality of solar cells C (only the solar cells C11 to C15 are illustrated) arranged in an 8 × 5 matrix, a sealing material 101, and a light receiving surface side protective material. 102, a back surface side protective material 103, and a terminal box 104.

  The sealing material 101 seals a plurality of solar cells C arranged in an 8 × 5 matrix, that is, eight solar cell groups G1 to G8 forming the power generation region X. As the sealing material 101, a light-transmitting resin such as EVA, EEA, PVB, silicon, urethane, acrylic, or epoxy can be used.

  The light receiving surface side protective material 102 is disposed on the light receiving surface side of the sealing material 101. For the light-receiving surface side protective material 102, light-transmitting and water-blocking glass, light-transmitting plastic, or the like can be used.

  The back surface side protective material 103 is disposed on the back surface side of the sealing material 101. As the back surface side protective material 103, a resin film such as PET (Polyethylene Terephthalate) or an Al foil sandwiched between resin films can be used.

  The terminal box 104 is disposed on the back surface of the solar cell module 100. The pair of positive and negative lead wires 10 and 11 and bypass diode connection wires 20 and 21 are led to a bypass diode (not shown) stored in the terminal box 104. In the present embodiment, the terminal box 104 is disposed at a position overlapping the solar cells C41 and C51 on a projection plane parallel to the main surface of the solar cell module 100. The position of the terminal box 104 can be appropriately changed according to the form of the solar cell module 100 or the power generation region X.

  An Al frame frame can be attached around the solar cell module 100 having the above configuration.

(Wiring configuration of conductive material 4 and lead-out wiring 10)
Next, the wiring configuration of the conductive material 4 and the extraction wiring 10 will be described with reference to FIG. This figure is an enlarged view of the vicinity of the solar cells C11 to C41 shown in FIG.

  As shown in FIG. 4, the conductive material 4 is connected to the extraction solar cell group G1 and extends into the non-power generation region Y along the first direction. Specifically, the conductive material 4 is connected to an electrode provided on the light receiving surface of the solar cell C11 located at one end in the first direction of the extraction solar cell group G1. The conductive material 4 is arranged side by side with the first conductive portion 4a that is electrically connected to the light receiving surface of the solar cell C11 and extends to the non-power generation region Y, and the first conductive portion 4a in the second direction. A second conductive portion 4b that is electrically connected to the light receiving surface and extends to the non-power generation region Y, and a third conductive portion 4c that electrically connects the first conductive portion 4a and the second conductive portion 4b in the non-power generation region Y. Including.

  The extraction wiring 10 is connected to the third conductive portion 4c by a conductive adhesive such as solder. Thus, the extraction wiring 10 is electrically connected to the solar cell C11 (that is, the extraction solar cell group G1) via the first conductive portion 4a, the second conductive portion 4b, and the third conductive portion 4c.

  The lead-out wiring 10 extends from the position soldered to the third conductive portion 4c in the non-power generation region Y to the back surface of the solar cell C11, that is, the back surface of the power generation region X. Therefore, as shown in FIG. 4, the lead-out wiring 10 is a first lead-out wiring portion 10 a provided along the conductive material 4 in the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. And a second lead-out wiring portion 10b provided in the power generation region X and connected to the first lead-out wiring portion 10a. Between the 2nd extraction wiring part 10b and the electric power generation area | region X, the buffer material (not shown) for relieving the stress in a modularization process is arrange | positioned. As the buffer material, EVA or the like can be used. In addition, the outer periphery of the second extraction wiring portion 10b is subjected to insulation treatment.

  Here, the extraction wiring 10 intersects the first conductive portion 4 a and the second conductive portion 4 b at the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Absent. Accordingly, the lead-out wiring 10 is separated from the first conductive portion 4a and the second conductive portion 4b on the outer side in the first direction of the solar cell C11 that forms the boundary between the power generation region X and the non-power generation region Y, It is located near the center of solar cells C11, C21, C31, C41.

  Further, the second extraction wiring portion 10 b does not cross the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Therefore, the 2nd extraction wiring part 10b is spaced apart from the edge | side formed in the 1st direction outer side of the solar cell C11, C21, C31, C41 which forms the boundary of the electric power generation area | region X and the non-electric power generation area | region Y.

(Wiring configuration of solar cell group connecting member 1, wiring member 2 and bypass diode connecting wiring 20)
Next, the wiring configuration of the solar cell group connecting member 1, the wiring member 2, and the bypass diode connecting wiring 20 will be described with reference to FIG.

  As shown in FIG. 4, two wiring members 2 are connected to the solar cell group G2 and extend into the non-power generation region Y along the first direction. Specifically, the two wiring members 2 are connected to electrodes provided on the back surface of the solar cell C21 located at one end in the first direction of the solar cell group G2. Similarly, two wiring members 2 are connected to the solar cell group G3 and extend into the non-power generation region Y along the first direction. Specifically, the two wiring members 2 are connected to electrodes provided on the light receiving surface of the solar cell C31 located at one end in the first direction of the solar cell group G3. In the non-power generation region Y, the solar cell group connection member 1 is electrically connected to these four wiring members 2 using a conductive adhesive such as solder.

  Further, the two wiring members 2 connected to the solar cell C31 are arranged side by side in the second direction. In the non-power generation region Y, the bypass diode connection wiring 20 is disposed between the two wiring members 2 and is electrically connected to the solar cell group connection member 1 using a conductive adhesive such as solder. ing.

  The bypass diode connection wiring 20 extends from the position solder-connected to the solar cell group connection member 1 in the non-power generation region Y to the back surface of the solar cell C31, that is, the back surface of the power generation region X. Therefore, as shown in FIG. 4, the bypass diode connection wiring 20 is provided on the projection surface parallel to the main surface of the solar cell module 100, and the first bypass provided along the wiring member 2 in the non-power generation region Y. It has a diode connection wiring portion 20a and a second bypass diode connection wiring portion 20b provided in the power generation region X so as to be connected to the first bypass diode connection wiring portion 20a. Between the second bypass diode connecting wiring portion 20b and the power generation region X, a buffer material (not shown) for relaxing stress in the modularization process is disposed. As the buffer material, EVA or the like can be used. In addition, the outer periphery of the second bypass diode connecting wiring portion 20b is subjected to insulation treatment.

  Here, the bypass diode connection wiring 20 does not cross the wiring member 2 at the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Therefore, the bypass diode connection wiring 20 is separated from the wiring member 2 on the outer side in the first direction of the solar cell C31 that forms the boundary between the power generation region X and the non-power generation region Y.

  Further, the second bypass diode connecting wiring portion 20 b does not cross the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Therefore, the second bypass diode connecting wiring portion 20b is separated from the outer side in the first direction of the solar cells C31 and C41 that form the boundary between the power generation region X and the non-power generation region Y, and the solar cells C31, It is located only on the back side of C41.

Further, on the projection plane parallel to the main surface of the solar cell module 100, the second extraction wiring portion 10b and the second bypass diode connection wiring portion 20b do not intersect with each other, and both are aligned along the second direction. Has been placed.

  FIG. 5 is a cross-sectional view taken along the line CC of FIG. As shown in FIGS. 4 and 5, the width α1 of the extraction wiring 10 is larger than the width β1 of the solar cell group connection member 1, and the thickness α2 of the extraction wiring 10 is smaller than the thickness β2 of the solar cell group connection member 1. Further, the width γ1 of the bypass diode connecting wire 20 is larger than the width β1 of the solar cell group connecting member 1, and the thickness γ2 of the bypass diode connecting wire 20 is smaller than the thickness β2 of the solar cell group connecting member 1.

  The wiring configuration of the extraction wiring 10 and the bypass diode connection wiring 20 has been described above. However, the extraction wiring 11 electrically connected to the solar cell C81 has the same wiring configuration as the extraction wiring 10. The bypass diode connection wiring 21 electrically connected to the solar cell C61 has the same wiring configuration as the bypass diode connection wiring 20.

(Method for manufacturing solar cell module)
First, a plurality of solar cells C are prepared. As the solar cell C, a general solar cell having a semiconductor junction such as a semiconductor pn junction or a semiconductor pin junction as a basic structure can be used. Note that electrodes having different polarities are provided on the light receiving surface and the back surface of the solar cell C, respectively.

  Next, the five solar cells C11 to C15 are arranged so that the electrodes of the same polarity face the same direction, and are arranged in order according to the arrangement direction. The solar cell connection members 3 are electrically connected to the solar cells C adjacent to each other using a conductive adhesive such as solder. At this time, the conductive material 4 is connected to the solar cell C11, and the wiring material 2 is connected to the solar cell C15. In this way, the extraction solar cell group G1 is formed. Similarly, an extraction solar cell group G8 is formed.

  Further, the five solar cells C21 to C25 are arranged so that the electrodes having the same polarity face the same direction, and are arranged according to the arrangement direction. The solar cell connection members 3 are electrically connected to the solar cells C adjacent to each other using a conductive adhesive such as solder. At this time, the wiring member 2 is connected to the solar cell C21 and the solar cell C25. Here, the wiring member 2 connected to the solar cell C21 is formed in a straight line as shown in FIG. In this way, the solar cell group G2 is formed. Similarly, a solar cell group G4 and a solar cell group G6 are formed.

  Further, the five solar cells C31 to C35 are arranged so that the electrodes having the same polarity face the same direction, and are arranged according to the arrangement direction. The solar cell connection members 3 are electrically connected to the solar cells C adjacent to each other using a conductive adhesive such as solder. At this time, the wiring member 2 is connected to the solar cell C31 and the solar cell C35. Here, a part of the wiring member 2 connected to the solar cell C31 is bent in the thickness direction along the side surface of the solar cell C31, as shown in FIG. 6B. That is, the position in the thickness direction of the wiring member 2 connected to the solar cell C31 is equivalent to the position in the thickness direction of the wiring member 2 connected to the solar cell C21. In this way, the solar cell group G3 is formed. Similarly, a solar cell group G5 and a solar cell group G7 are formed.

  Next, the solar cell group connection member 1 is electrically connected to the wiring member 2 using a conductive adhesive such as solder. FIG. 7A shows a state in which the solar cell group connection member 1 is connected to the wiring member 2 connected to the solar cell C21. FIG.7 (b) has shown the state by which the solar cell group connection member 1 was connected to the wiring material 2 connected to the solar cell C31. As described above, the eight solar cell groups G1 to G8 are electrically connected in series, and the power generation region X is formed.

Next, the lead-out wires 10 and 11 are solder-connected to the conductive material 4, and the bypass diode connection wires 20 and 21 are electrically connected to the solar cell group connection member 1 using a conductive adhesive such as solder. The extraction wirings 10 and 11 extend from the position connected to the conductive material 4 to the back surface of the power generation region X. The bypass diode connection wires 20 and 21 extend from the position connected to the solar cell group connection member 1 to the back surface of the power generation region X.

  Next, an EVA sheet (sealing material 101), eight solar cell groups G1 to G8, an EVA sheet (sealing material 101), and a PET / aluminum / PET laminate on a glass substrate (light-receiving surface side protective material 102) Sheets (back side protective material 103) are sequentially laminated to form a laminate. At this time, the extraction wirings 10 and 11 and the bypass diode connection wirings 20 and 21 are brought out to the outside of the stacked body through notches formed in the sealing material 101 and the back surface side protection material 103.

  Next, the laminate is pressure-bonded while being heated in a vacuum atmosphere. Thereby, the eight solar cell groups G1 to G8 are sealed between the glass substrate and the PET / aluminum / PET sheet.

  The extraction wirings 10 and 11 and the bypass diode connection wirings 20 and 21 are stored in the terminal box 104.

  Thus, the solar cell module 100 is manufactured. Note that an Al frame can be attached to the solar cell module 100.

(Function and effect)
In the solar cell module 100 according to the present embodiment, on the projection plane parallel to the main surface of the solar cell module 100, the extraction wiring 10 is a first extraction wiring provided along the conductive material 4 in the non-power generation region Y. Part 10a and a second extraction wiring part 10b provided in the power generation region X and connected to the first extraction wiring part 10a. Further, the bypass diode connection wiring 20 includes a first bypass diode connection wiring portion 20a provided along the wiring member 2 in the non-power generation region Y and a first bypass diode connection wiring portion 20a in the power generation region X. And a second bypass diode connecting wiring portion 20b provided continuously with the second bypass diode connecting portion.

  Thus, the extraction wiring 10 and the bypass diode connection wiring 20 are not routed outside the power generation region X. Therefore, the ratio of the area of the power generation region X to the area of the solar cell module 100 can be increased. As a result, the power generation amount per unit area of the solar cell module 100 can be improved.

  Moreover, in the solar cell module 100 according to the present embodiment, the width of the extraction wiring 10 is larger than the width of the solar cell group connection member 1, and the thickness of the extraction wiring 10 is smaller than the thickness of the solar cell group connection member 1. . Further, the width of the bypass diode connection wiring 20 is larger than the width of the solar cell group connection member 1, and the thickness of the bypass diode connection wiring 20 is smaller than the thickness of the solar cell group connection member 1.

  Thus, the thickness of the extraction wiring 10 and the bypass diode connection wiring 20 is smaller than the thickness of the solar cell group connection member 1. Therefore, when each component of the solar cell module 100 is pressure-bonded as a laminated body, it is possible to prevent stress from being concentrated on a part of the solar cell C arranged so as to overlap with the extraction wiring 10. As a result, it is possible to suppress the occurrence of cracking and chipping of the solar cell C in the modularization process. Further, by increasing the widths of the extraction wiring 10 and the bypass diode connection wiring 20, it is possible to avoid an increase in the resistance value of each member. Furthermore, by increasing the thickness of the solar cell group connection member 1 arranged in the non-power generation region Y and reducing the width, the resistance value of the solar cell group connection member 1 is prevented from increasing, The area of the power generation region Y can be reduced. As a result, the power generation amount per unit area can be further improved.

  Further, in the solar cell module 100 according to the present embodiment, the second extraction wiring portion 10b and the second bypass diode connection wiring portion 20b do not intersect. Therefore, it is possible to avoid stress concentration on a part of the solar cell C. As a result, it is possible to suppress the occurrence of cracking and chipping of the solar cell C in the modularization process.

  Here, cracks and chips generated when stress concentrates on a part of the solar cell C are particularly likely to occur at the end of the solar cell C. Therefore, it is desirable that the constituent members are not overlapped with the end portion of the solar cell C.

  In the solar cell module 100 according to the present embodiment, the extraction wiring 10, the first conductive portion 4a, and the second conductive portion 4b are located at the boundary between the power generation region X and the non-power generation region Y, that is, at the end of the solar cell C11. Since it does not cross, the generation | occurrence | production of the crack in the edge part of the solar cell C11 can be suppressed.

  Further, in the solar cell module 100 according to the present embodiment, the second extraction wiring portion 10b and the second bypass diode connection wiring portion 20b are boundaries between the power generation region X and the non-power generation region Y, that is, solar cells C11 and C21. , C31 and C41 are not crossed. Therefore, cracks and chippings at the end portions of these solar cells C can be suppressed.

  Further, in the solar cell module 100 according to the present embodiment, a buffer material (EVA) is provided between the second extraction wiring portion 10b and the power generation region X and between the second bypass diode connection wiring portion 20b and the power generation region X. Etc.) are arranged. Therefore, the stress applied in the modularization process can be reduced.

  Moreover, in the solar cell module 100 according to the present embodiment, the second extraction wiring portion 10b and the second bypass diode connection wiring portion 20b are insulated. Therefore, it is possible to sufficiently ensure insulation between the second extraction wiring portion 10b and the second bypass diode connection wiring portion 20b and each solar cell C included in the power generation region X.

  Moreover, in the manufacturing method of the solar cell module 100 according to the present embodiment, a part of the wiring member 2 connected to the solar cell C31 is bent in the thickness direction along the side surface of the solar cell C31. That is, in the non-power generation region Y, the position in the thickness direction of the wiring member 2 connected to the solar cell C31 is equivalent to the position in the thickness direction of the wiring member 2 connected to the solar cell C21.

  Therefore, when connecting the solar cell group connecting member 1 to the wiring member 2, it is not necessary to bend the wiring member 2 by pressing the solar cell group connecting member 1 against the wiring member 2. As a result, it is possible to avoid stress concentration on the end of the solar cell C31 and to suppress the occurrence of cracks and chips in the solar cell C.

(Modification of the embodiment)
In the above-described embodiment of the present invention, the case where the eight solar cell groups G1 to G8 constituting the solar cell module 100 are electrically connected in series has been described, but the present invention is not limited to this. The present invention can also be applied to the case where some solar cell groups are connected in parallel.

  With reference to FIG. 8, the structure of the solar cell module 100 which concerns on this modification is demonstrated. FIG. 8 is a back view showing the configuration of the solar cell module 100 according to this modification.

The solar cell module 100 according to this modification is configured such that power generated by the power generation region X, the non-power generation region Y, the solar cell group connection member 5, the conductive material 6, and the power generation region X is supplied to the outside of the solar cell module 100. Extraction wirings 10 and 11 and a bypass diode connection wiring 20 are provided.

  The power generation region X includes twelve first to twelfth solar cell groups G01 to G12 formed by arranging n solar cells C in the first direction. That is, the power generation region X is formed by arranging the solar cells C in a 12 × n matrix.

  The first to twelfth solar cell groups G01 to G12 are arranged in order along the second direction. Solar cells C011 to G031 positioned at one end in the first direction of each of the first to third solar cell groups G01 to G03 are arranged such that electrodes having the same polarity face each other in the same direction. In addition, the solar cells C01n to G03n positioned at the other ends in the first direction of the first to third solar cell groups G01 to G03 are arranged so that electrodes having the same polarity face each other in the same direction. The same applies to the fourth to sixth solar cell groups G04 to G06, the seventh to ninth solar cell groups G07 to G09, and the tenth to twelfth solar cell groups G10 to G12. However, the solar cells C011 to G031 are arranged such that electrodes having the same polarity as the solar cells C071 to G091 face the same direction, but electrodes having different polarities from the solar cells C041 to G061 and the solar cells C101 to G121 are arranged. It is arranged to face the same direction.

  The solar cell group connection member 5 electrically connects the electrodes of the same polarity of the solar cells C01n to G03n in parallel and electrically connects the electrodes of the same polarity of the solar cells C04n to G06n in parallel. . Furthermore, the solar cell group connection member 5 electrically connects the solar cells C01n to G03n and the solar cells C04n to G06n in series. As described above, the solar cell group connection member 5 electrically connects the three solar cell groups G adjacent to each other in parallel and electrically connects the three solar cell groups G in series. . The number of solar cell group connection members 5 is three. The three solar cell group connection members 5 are each provided in the non-power generation region Y. A bypass diode connection wiring 20 is electrically connected to the solar cell group connection member 5 connecting the fourth to ninth solar cell groups G04 to G09.

  A pair of positive and negative lead wires 10 and 11 are electrically connected to the third solar cell group G03 and the tenth solar cell group G10 via the conductive material 6. Therefore, in this modification, the solar cell groups G03 and G10 are taken out and referred to as a solar cell group.

  An extraction wiring 10 is electrically connected to the extraction solar cell group G03 through a conductive material 6. The conductive material 6 is connected to the extraction solar cell group G03 and extends to the non-power generation region Y. Specifically, the conductive material 6 is connected to the solar cell C031 positioned at one end in the first direction of the extraction solar cell group G03, and extends into the non-power generation region Y along the first direction.

  Next, the extraction solar cell group G10 includes n solar cells C101 to C10n, and has the same configuration as the extraction solar cell group G03. Therefore, the extraction wiring 11 is electrically connected to the extraction solar cell G <b> 10 via the conductive material 6. The extraction wiring 11 has a polarity different from that of the extraction wiring 10.

(Wiring configuration of conductive material 6 and lead-out wiring 10)
Next, the wiring configuration of the conductive material 6 and the extraction wiring 10 will be described. The wiring configuration of the conductive material 6 and the extraction wiring 10 is the same as the wiring configuration of the conductive material 4 and the extraction wiring 10 according to the above embodiment. Therefore, in the following description, please refer to FIG. 4 as appropriate.

The conductive material 6 is connected to the extraction solar cell group G · BR> O3 and extends into the non-power generation region Y along the first direction. In the non-power generation region Y, the lead-out wiring 10 is solder-connected to the third conductive portion 6c. Thus, the extraction wiring 10 is electrically connected to the solar cell C031 (that is, the extraction solar cell group G03) through the conductive material 6.

  The lead-out wiring 10 extends from the position connected to the third conductive portion 6c in the non-power generation region Y to the back surface of the solar cell C031, that is, the back surface of the power generation region X, along the first conductive portion 6a and the second conductive portion 6b. It extends. Accordingly, the lead-out wiring 10 is a first lead-out wiring portion provided along the first conductive portion 6a and the second conductive portion 6b in the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. 10a and a second extraction wiring portion 10b provided in the power generation region X and connected to the first extraction wiring portion 10a. Between the 2nd extraction wiring part 10b and a part of electric power generation area | region X, the buffer material for relieving the stress in a modularization process is arrange | positioned. As the buffer material, EVA or the like can be used. In addition, an insulation process is applied to a part of the outer periphery of the second lead-out wiring portion 10b.

  Here, the extraction wiring 10 intersects the first conductive portion 6 a and the second conductive portion 6 b at the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Absent. Further, the second extraction wiring portion 10 b does not cross the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100.

(Wiring configuration of solar cell group connecting member 5 and bypass diode connecting wiring 20)
The wiring configuration of the solar cell group connection member 5 and the bypass diode connection wiring 20 conductive material 6 is the same as the wiring configuration of the solar cell group connection member 1 and the bypass diode connection wiring 20 according to the above embodiment. Therefore, in the following description, please refer to FIG. 4 as appropriate.

  Two wiring members 2 are connected to the solar cell group G07 and extend into the non-power generation region Y along the first direction. Specifically, the two wiring members 2 are connected to the electrodes provided on the back surface of the solar cell C071 located at one end in the first direction of the solar cell group G07. The solar cell group connection member 5 is connected to the two wiring members 2 in the non-power generation region Y using solder.

  In addition, the two wiring members 2 connected to the solar cell C071 are arranged side by side in the second direction. The bypass diode connection wiring 20 is arranged side by side with these two wiring members 2 and is connected to the solar cell group connection member 5 in the non-power generation region Y.

  The bypass diode connection wiring 20 extends from the position soldered to the solar cell group connection member 5 in the non-power generation region Y to the back surface of the solar cell C071, that is, the back surface of the power generation region X. Accordingly, the bypass diode connection wiring 20 includes the first bypass diode connection wiring portion 20a provided along the wiring member 2 in the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. And a second bypass diode connecting wiring portion 20b provided in the power generation region X and connected to the first bypass diode connecting wiring portion 20a. Between the second bypass diode connecting wiring portion 20b and the power generation region X, a buffer material for relaxing stress in the modularization process is disposed. As the buffer material, EVA or the like can be used. In addition, the outer periphery of the second bypass diode connecting wiring portion 20b is subjected to insulation treatment.

  Here, the bypass diode connection wiring 20 does not intersect the two wiring members 2 at the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100. Further, the second bypass diode connecting wiring portion 20 b does not intersect the boundary between the power generation region X and the non-power generation region Y on the projection plane parallel to the main surface of the solar cell module 100.

Further, on the projection plane parallel to the main surface of the solar cell module 100, the second extraction wiring portion 10b and the second bypass diode connecting wiring portion 20b do not intersect. In addition, the position where the 2nd extraction wiring part 10b and the 2nd bypass diode connection wiring part 20b are arrange | positioned can be changed suitably.

  Here, the width of the extraction wiring 10 is larger than the width of the solar cell group connection member 5, and the thickness of the extraction wiring 10 is smaller than the thickness of the solar cell group connection member 5. Further, the width of the bypass diode connection wiring 20 is larger than the width of the solar cell group connection member 5, and the thickness of the bypass diode connection wiring 20 is smaller than the thickness of the solar cell group connection member 5.

(Method for manufacturing solar cell module)
Since the manufacturing method of the solar cell module 100 according to this modification is the same as that of the first embodiment, differences will be described.

  In the said embodiment, all the solar cells C were arrange | positioned so that the electrode of the same polarity might face the same direction. Therefore, the solar cells C are electrically connected in series by connecting the solar cell group connection member 1 to the wiring member 2 connected to the light receiving surface and the wiring member 2 connected to the back surface. Therefore, a concentration of stress when connecting the solar cell group connection member 1 is avoided by bending a part of one wiring member 2 in advance.

  On the other hand, in this modification, the solar cells C in which electrodes having the same polarity are arranged in the same direction are electrically connected in parallel. Moreover, the solar cells C in which electrodes having different polarities are arranged in the same direction are electrically connected in series. In this modification, all the wiring members 2 are connected to the back side of each solar cell C, and the solar cell group connection member 5 is connected to all the wiring members 2 from the light receiving surface side in the non-power generation region Y. ing. Therefore, all the wiring members 2 can be linearly formed.

(Function and effect)
Also by the solar cell module 100 according to the present modification, the same effect as in the above embodiment can be obtained. That is, since the extraction wirings 10 and 11 and the bypass diode connection wiring 20 are not routed outside the power generation region X in this way, the power generation amount per unit area of the solar cell module 100 can be improved.

  Further, the solar cells C in which electrodes of the same polarity are arranged in the same direction are electrically connected in parallel, and the solar cells C in which electrodes of different polarities are arranged in the same direction are electrically connected in series. Therefore, it is possible to use all the wiring members 2 processed into a straight line.

(Other embodiments)
Although the present invention has been described with reference to the above-described embodiments and modifications thereof, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the said embodiment, although the solar cell C was arrange | positioned at matrix form, the number of the solar cells C contained in the one solar cell group G and the number of the solar cell groups G can be changed suitably.

  Moreover, in the said embodiment, although the 2nd extraction wiring part 10b and the 2nd bypass diode connection wiring part 20b were arrange | positioned substantially parallel, arrangement | positioning can be changed unless each intersects.

Moreover, in the said embodiment, although it was set as the structure by which the bypass diode connection wirings 20 and 21 were connected to the solar cell groups G3 and G6, the bypass diode connection wiring was further connected to the solar cell groups G2 and G7. Also good. Further, the solar cell module 100 may not include the bypass diode connection wires 20 and 21.

  Moreover, in the said embodiment, although the 1st extraction wiring part 10a was connected to the 3rd electroconductive part 4c between the 1st electroconductive part 4a and the 2nd electroconductive part 4b, as shown in FIG. The wiring part 10a may be connected to the extending part of the third conductive part 4c.

  A ... Power generation region, B ... Non-power generation region, C ... Solar cell, G ... Solar cell group, 1 ... Solar cell group connection member, 2 ... Wiring material, 3 ... Solar cell connection member, 4 ... Conductive material, 4a ... No. DESCRIPTION OF SYMBOLS 1 conductive part, 4b ... 2nd conductive part, 4c ... 3rd conductive part, 5 ... Solar cell group connection member, 6 ... Conductive material, 6a ... 1st conductive part, 6b ... 2nd conductive part, 6c ... 3rd conductive , 10, 11 ... extraction wiring, 10a ... first extraction wiring section, 10b ... second extraction wiring section, 20, 21 ... bypass diode connection wiring, 20a ... first bypass diode connection wiring section, 20b ... second Bypass diode connection wiring portion, 100 ... solar cell module, 101 ... sealing material, 102 ... light-receiving surface side protective material, 103 ... back surface side protective material, 104 ... terminal box

Claims (6)

A power generation region having a light receiving surface for receiving light and a back surface opposite to the light receiving surface, and generating power by receiving light, and a non-power generation region formed outside the power generation region, and having a bypass diode A solar cell module having a terminal box provided on the back side,
A first solar cell group having a plurality of solar cells provided in the power generation region and arranged according to a first direction;
A first conductive part electrically connected to the first solar cell group and extending to the non-power generation region; and a first conductive part arranged side by side in the second direction substantially orthogonal to the first direction. A second conductive portion electrically connected to the first solar cell group and extending to the non-power generation region; and a third conductive portion electrically connecting the first conductive portion and the second conductive portion in the non-power generation region. A conductive material comprising a conductive part;
A first extraction wiring portion connected to the conductive material in the non-power generation region; and a second extraction wiring portion provided in the power generation region and connected to the first extraction wiring portion. A lead-out wiring that leads the power generated by the region to the terminal box and takes it out of the solar cell module;
A solar cell module comprising:
On the projection plane parallel to the back surface of the solar cell module,
The third conductive part has an extending part in a direction opposite to the second conductive part with respect to the first conductive part, and the first extraction wiring part is connected to the extending part,
The solar cell module, wherein the first conductive portion, the second conductive portion, and the first lead-out wiring portion are spaced apart at a boundary between the power generation region and the non-power generation region. The power generation region is a region including the first solar cell group,
The non-power generation region is a region not including the first solar cell group,
The solar cell module according to claim 1, wherein the boundary is an end portion of the solar cell included in the first solar cell group. The third conductive portion is provided along the second direction;
The first extraction wiring portion is provided along the first direction;
The solar cell module according to claim 1 or 2, wherein the second lead-out wiring portion is provided along the second direction.   The solar cell module according to claim 1, wherein a buffer material is provided between the second extraction wiring portion and the power generation region. A plurality of solar cells provided in the power generation region, arranged in accordance with a first direction, and arranged in parallel with the first solar cell group in a second direction substantially orthogonal to the first direction; A group of solar cells;
A wiring member electrically connected to the second solar cell group and extending to the non-power generation region;
In the non-power generation area, a solar cell group connection member that connects the solar cell group adjacent to the second solar cell group and the wiring member;
Connected to the solar cell group connection member and provided along the first direction, and a bypass diode connection wiring for connecting to the bypass diode;
Further comprising
On the projection plane parallel to the back surface of the solar cell module,
The extraction wiring and the bypass diode connection wiring do not intersect,
The solar cell module according to claim 3, wherein the wiring member and the bypass diode connection wiring are spaced apart from each other at a boundary between the power generation region and the non-power generation region.   The solar cell module according to claim 5, wherein a buffer material is provided between the bypass diode connection wiring and the power generation region.

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