Power generation module

Abstract

The visibility of the lead wires was reduced, and the deterioration of sealing performance was suppressed. [Solution] The power generation module comprises a first substrate and a second substrate facing each other, a power generation element disposed on the first substrate between the first and second substrates, lead wires electrically connected to the power generation element, and a sealing member disposed between the first and second substrates to seal the internal space between the first and second substrates. The lead wire has a first wire portion located in the internal space and a second wire portion that penetrates the sealing member. The ratio of the width of the second wire portion to the thickness is greater than the ratio of the width of the first wire portion to the thickness.

Description

Technical Field

[0001] The present disclosure relates to a power generation module used for building integrated photovoltaics (BIPV).

Background Art

[0002] Building integrated photovoltaics (BIPV) that uses a power generation module as a building window has been conventionally studied. As shown in Patent Document 1, in a power generation module, it is generally performed to take out the electricity generated by a power generation element to the outside of the power generation module via a lead wire.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a power generation module is used as part of a building window, the building window is exposed to the outside air, wind, and rain. Therefore, it is necessary to enhance the sealing performance so that oxygen and water vapor do not invade the power generation module and the power generation element does not deteriorate. In particular, for perovskite solar cell elements, higher sealing performance is required because element deterioration due to oxygen and moisture is more likely to occur than for silicon-based solar cell elements.

[0005] Also, in terms of appearance, since lead wires for taking out electricity to the outside are disposed inside the power generation module, if the lead wires are visually recognized from the outside through a transparent substrate, the appearance as a building window deteriorates.

[0006] The present disclosure provides a power generation module that reduces the visibility of lead wires and suppresses a decrease in sealing performance.

Means for Solving the Problems

[0007] The power generation module of this disclosure comprises a first substrate and a second substrate facing each other, a power generation element disposed on the first substrate between the first substrate and the second substrate, lead wires electrically connected to the power generation element, and a sealing member disposed between the first substrate and the second substrate to seal the internal space between the first substrate and the second substrate. The lead wire has a first wire portion located in the internal space and a second wire portion that penetrates the sealing member. The ratio of the width of the second wire portion to the thickness is greater than the ratio of the width of the first wire portion to the thickness. [Effects of the Invention]

[0008] The power generation module of this disclosure provides a power generation module that reduces the visibility of lead wires and suppresses the deterioration of sealing performance. [Brief explanation of the drawing]

[0009] [Figure 1] schematic front view of a power generation module [Figure 2] Schematic cross-section of the power generation module along line VII-VII in Figure 1. [Figure 3] Schematic front view of the power generation element in the power generation module shown in Figure 1. [Figure 4] Figure 3: Enlarged front view of a portion of the power generation element. [Figure 5] Enlarged cross-sectional view along the VIA-VIA line in Figure 4. [Figure 6] Enlarged cross-sectional view along the VIB-VIB line in Figure 4. [Figure 7] Enlarged cross-sectional view of region Z1 in the power generation module in Figure 2. [Figure 8] Enlarged cross-sectional view of region Z2 in the power generation module shown in Figure 2. [Figure 9] Figure 2 shows a vertical cross-sectional view of the power generation module as seen from direction A. [Figure 10] Longitudinal cross-section of the first lead wire [Figure 11] Longitudinal cross-section of the second wire portion of the lead wire. [Figure 12]Vertical cross-sectional view of the power generation module in the modified example [Figure 13] Vertical cross-sectional view of the power generation module in the modified example

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description, terms indicating a specific direction or position (for example, terms including "up", "down", "right", and "left") are used as necessary. However, the use of these terms is for facilitating the understanding of the present disclosure with reference to the drawings, and the technical scope of the present disclosure or the usage mode of the power generation module according to the present disclosure is not limited by the meanings of these terms. Further, the following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the ratios of each dimension etc. do not necessarily match the actual ones.

[0011] In this specification, "electrically connected" means that at least one of the following is satisfied: current can flow between a plurality of components, a plurality of components are capacitively coupled, and a plurality of components are electromagnetically coupled.

[0012] (Embodiment) Hereinafter, this embodiment will be described with reference to the drawings.

[0013] [1. Configuration of the power generation module] Referring to FIGS. 1 and 2, the basic configuration of the power generation module 10 will be described. FIG. ① is a schematic front view of the power generation module 10. FIG. ② is a schematic cross-sectional view taken along line II-II of the power generation module in FIG. ①.

[0014] As shown in FIGS. 1 and 2, the power generation module 10 includes a first substrate 11, a second substrate 12, a power generation element 100, and a filler 32.

[0015] Note: In the above translation, ① and ② are used to replace the specific figure numbers in the original text which are not clearly provided in the input. You can replace them with the actual figure numbers according to the original content.The power generation module 10 can be used as a building material for a window or a veranda that is arranged in a building such that external light enters from the side of the first substrate 11.

[0016] The Z direction (also referred to as the "first direction") shown in FIGS. 1 to 3 corresponds to the thickness direction of the power generation module 10. The thickness direction of the power generation module 10 is, for example, the stacking direction of the two substrates 11 and 12, or the stacking direction of the solar cell layers included in the power generation module 10. Further, in a plane orthogonal to the Z direction, the directions intersecting (here, orthogonal) with each other are defined as the X direction and the Y direction. The Y direction is, for example, the height direction of the window, and the X direction may be, for example, the width direction of the window.

[0017] The first substrate 11 and the second substrate 12 have translucency. "Translucency" means transmissivity with respect to visible light. The first substrate 11 and the second substrate 12 are, for example, rectangular glass substrates (reinforced glass substrates) for building materials, and have a thickness of, for example, 2 mm or more. As shown in FIG. 1, in a top view of the power generation module 10 or a part thereof, for the sake of clarity, the illustration of the second substrate 12 may be omitted.

[0018] As shown in FIG. 2, the first substrate 11 and the second substrate 12 are arranged to face each other in the Z direction. The first substrate 11 on the light-receiving side has the same thickness as the second substrate 12, but may be thinner than the second substrate 12 to improve translucency, or may be thicker than the second substrate 12 to improve strength. The peripheral edge of the first substrate 11 and the peripheral edge of the second substrate 12 are sealed by a sealing member 50. In a plan view seen from the Z direction, the sealing member 50 is located outside the central region 13 where the power generation element 100 is arranged. In other words, the central region 13 is a region surrounded by the sealing member 50 in the power generation module 10. As the sealing member 50, a thermoplastic elastomer such as butyl rubber can be used, for example, to suppress water vapor intrusion. By using ethylene vinyl alcohol copolymer resin (EVOH) in combination to prevent oxygen intrusion, the sealing performance can be further enhanced.

[0019] The power generation element 100 is a solar cell module having a solar cell (power generation unit). The power generation element 100 is located between the first substrate 11 and the second substrate 12. In the example shown in Figure 1, the power generation element 100 is arranged in the space enclosed by the first substrate 11, the second substrate 12, and the sealing member 50.

[0020] As shown in Figure 2, the filler material 32 is located between the second substrate 12 and the first substrate 11, and between the second substrate 12 and the upper surface of the power generation element 100. As these filler materials 32, for example, polyvinyl butyral (PVB), ethylene vinyl acetate copolymer (EVA), polyolefin (PO), etc., can be used.

[0021] The filler material 32 may fill the space surrounded by the first substrate 11, the second substrate 12, and the sealing member 50. This suppresses the influence of air on the solar cell layer within the power generation element 100. In addition, an air layer may be partially formed in the space other than the portion in contact with the power generation module.

[0022] As shown in Figure 1, the power generation module 10 includes a first wiring 41a and a second wiring 42a extending in the Y-axis direction between the first substrate 11 and the second substrate 12. These wirings may be metal wirings. In this embodiment, these wirings are copper wires covered with solder (tab wires).

[0023] In the illustrated example, the first wiring 41a is provided on one end of the power generation element 100 in the X direction. The second wiring (e.g., tab wire) 42a is provided on the other end of the power generation element 100 in the X direction.

[0024] As shown in Figure 1, the power generation module 10 further comprises a pair of lead wires 21 and 22. The lead wires 21 and 22 are, for example, metal wiring (e.g., tab wires). The lead wires 21 and 22 are electrically connected to the power generation element 100 within a space enclosed by the first substrate 11, the second substrate 12, and the sealing member 50. The lead wires 21 and 22 are drawn out from within this space through the sealing member 50 to the outside.

[0025] In the example shown in Figure 1, lead wire 21 includes the first wiring 41a, and lead wire 22 includes the second wiring 42a.

[0026] [2. Structure of the power generation element 100] The structure of the power generation element 100 in the power generation module 10 will be explained with reference to Figures 3 to 6.

[0027] Figure 3 is a schematic top view of the power generation element 100 in the power generation module. Figure 4 is an enlarged top view of a part of the power generation element 100 in Figure 3. Figure 4 shows an enlarged view of the region 100a shown in Figure 3. Figure 5 is an enlarged cross-sectional view along the VIA-VIA line in Figure 4. Figure 6 is an enlarged cross-sectional view along the VIB-VIB line in Figure 4.

[0028] As shown in Figure 3, the power generation element 100 comprises a power generation unit supported by the first substrate 11, a portion of the first wiring 41a, and a portion of the second wiring 42a, all located on a light-transmitting first substrate 11. In the example shown in Figure 3, the power generation unit includes a plurality of linear strings 120. The power generation unit is located on a portion of the main surface 11s (inner surface) of the first substrate 11.

[0029] The power generation unit includes at least a solar cell layer. As will be described later, the power generation unit has a laminated structure that includes, for example, a pair of transparent electrodes and a solar cell layer located between the pair of transparent electrodes. The laminated structure only needs to be supported by the main surface 11s of the first substrate 11 and does not need to be in direct contact with it.

[0030] The first wiring 41a is located on one end of the first substrate 11. The second wiring 42a is located on the other end of the first substrate 11. Wires 41a and 42a are electrically connected to the power generation section.

[0031] Multiple power generation strings 120 are connected in parallel by wirings 41a and 42a. Here, each string 120 extends along the X direction from one end to the other of the first substrate 11. One end of each string 120 is connected to wiring 41a, and the other end is connected to wiring 42a.

[0032] Multiple strings 120 are arranged on the main surface 11s of the first substrate 11, spaced apart from each other in the Y direction. In a plan view from the Z direction, the multiple strings 120 may, for example, extend parallel to each other. In a plan view from the Z direction, the region 130 located between adjacent strings 120 on the main surface 11s of the first substrate 11 is called the "inter-string region".

[0033] As shown in Figures 4 and 5, each of the multiple strings 120 is a solar cell element string having multiple solar cell elements 150 connected in series.

[0034] As shown in Figures 5 and 6, each string 120 has a laminated structure L in which multiple layers, including a lower transparent conductive layer LE, a solar cell layer PV, and an upper transparent conductive layer UE, are stacked in the Z direction. These layers are supported on a main surface 11s. In the laminated structure L, the solar cell layer PV is located between the lower transparent conductive layer LE and the upper transparent conductive layer UE. The lower transparent conductive layer LE is located on the first substrate 11 side of the solar cell layer PV. The solar cell layer PV is a thin film type, for example, a laminated film including an n-type semiconductor layer, an i-type semiconductor layer, and a p-type semiconductor layer from the first substrate 11 side. The solar cell layer PV may further include an electron transport layer and / or a hole transport layer, as needed.

[0035] The lower transparent conductive layer LE, the solar cell layer PV, and the upper transparent conductive layer UE are separated for each solar cell element 150. In this example, the solar cell layer PV and the upper transparent conductive layer UE are separated for each solar cell element 150 by a separation groove 160. The lower transparent conductive layer LE includes the lower transparent electrode 151 of each solar cell element 150. The upper transparent conductive layer UE includes the upper transparent electrode 155 of each solar cell element 150. The solar cell layer PV includes the semiconductor layer 153 of each solar cell element 150.

[0036] Each solar cell element 150 has a lower transparent electrode 151, an upper transparent electrode 155, and a semiconductor layer 153 located between the lower transparent electrode 151 and the upper transparent electrode 155. The lower transparent electrode 151 (or upper transparent electrode 155) of the solar cell element 150 located at one end of each string 120 is electrically connected to the wiring 141. Similarly, the upper transparent electrode 155 (or lower transparent electrode 151) of the solar cell element 150 located at the other end of each string 120 is electrically connected to the wiring 142.

[0037] The solar cell layer PV (i.e., semiconductor layer 153) is a layer that converts absorbed light into photoelectric energy (photoelectric conversion layer). The solar cell layer PV contains, for example, a perovskite compound (peribskite semiconductor) as the photoelectric conversion material. The perovskite compound is a perovskite crystal structure represented by the chemical formula ABX3 and structures having similar crystals. A is a monovalent cation, B is a divalent cation, and X is a halogen anion. The lower transparent conductive layer LE and the upper transparent conductive layer UE are light-transmitting metal oxide layers such as indium tin oxide (ITO) or indium zinc oxide (IZO), or a fluorine-doped tin oxide (FTO) layer. Note that the materials of each layer constituting the solar cell element are not limited to those described above, and known materials may be used.

[0038] [3. Lead wires] Next, the lead wires 21 and 22 of the power generation module 10 will be further described with reference to Figures 7 and 8. Figure 7 is an enlarged cross-sectional view of region Z1 in the power generation module 10 of Figure 2. Figure 8 is an enlarged cross-sectional view of region Z2 in the power generation module 10 of Figure 2.

[0039] If measures are taken to make the lead wires 21 and 22 less noticeable in a plan view, such as narrowing the width of the lead wires 21 and 22, the cross-sectional area of ​​the lead wires 21 and 22 decreases, reducing their electrical conductivity. In contrast, the decrease in electrical conductivity can be suppressed by increasing the thickness of the lead wires 21 and 22. However, if the lead wires 21 and 22, which are thicker in the thickness direction, penetrate the sealing member 50, the difference in thickness of the sealing member 50 becomes large in and around the through hole 51, which may lead to problems such as a decrease in sealing performance around the through hole 51. In this embodiment, a configuration that solves these problems is described below.

[0040] The lower transparent electrode 151 has a first extended portion 161 and a second extended portion 162 that protrude in the X direction from the semiconductor layer 153 in a plan view. The first extended portion 161 is the region in which the lower transparent electrode 151 protrudes in the -X direction relative to the semiconductor layer 153. The second extended portion 162 is the region in which the lower transparent electrode 151 protrudes in the +X direction relative to the semiconductor layer 153. In this embodiment, each extended portion 161, 162 has a band shape that extends along the Y direction in a plan view.

[0041] The first extension 161 becomes the positive electrode of the power generation module 10. The second extension 162 becomes the negative electrode of the power generation module 10.

[0042] In this embodiment, the lead wire 21 for taking out the positive electrode is connected to the first expansion section 161 over substantially the entire length of each first expansion section 161 in the Y direction. Similarly, the lead wire 22 for taking out the negative electrode is connected to the second expansion section 162 over substantially the entire length of each second expansion section 162 in the Y direction.

[0043] Refer to Figures 9 to 11. Figure 9 is a longitudinal cross-sectional view taken from direction A in Figure 2. Figure 10 is a longitudinal cross-sectional view of the first line portions 211 and 221 of lead wires 21 and 22. Figure 11 is a longitudinal cross-sectional view of the second line portions 212 and 222 of lead wires 21 and 22.

[0044] The lead wires 21 and 22 are conductive. In this embodiment, as shown in Figures 10 and 12, the lead wires 21 and 22 have a copper wire 171 and a solder layer 172 covering the copper wire 171. The solder layer 172 constitutes the outermost layer of the lead wires 21 and 22.

[0045] The solder layer 172 suppresses the occurrence of rust on the copper wire 171. In addition, when each lead wire 21, 22 is soldered to other components, the solder layer 172 functions as a pre-solder layer.

[0046] As shown in Figure 9, lead wire 21 has a first wire portion 211 located within the central region 13 surrounded by the sealing member 50, and a second wire portion 212 that penetrates the sealing member 50 within the sealing member 50. Lead wire 22 has a first wire portion 221 located within the central region 13 surrounded by the sealing member 50, and a second wire portion 222 that penetrates the sealing member 50 within the sealing member 50. The ends of the first wire portions 211 and 221 opposite to the portions connected to the lower transparent electrode 151 are connected to one end of the second wire portions 212 and 222, respectively. The other ends of the second wire portions 212 and 222 are connected to connecting lead wires 23, respectively. The connecting lead wires 23 are connected, for example, to terminal boxes provided on the positive and negative sides. The connecting lead wire 23 may have a vertically flattened shape, similar to the first wire sections 211 and 221, or a horizontally flattened shape, similar to the second wire sections 212 and 222.

[0047] In the sealing member 50, a through hole 51 is formed that communicates from the internal space of the power generation module 10 to the outside, and the second line portions 212 and 222 are arranged in the through hole 51. If the thickness of the second line portions 212 and 222 increases, the thickness of the sealing member 50 around the through hole 51 decreases, and the sealing performance deteriorates.

[0048] Figure 10 shows the longitudinal sections of the first line portion 211 of lead wire 21 and the first line portion 221 of lead wire 22. The first line portions 211 and 221 have a thickness Tk1 that is longer than the width W1 of lead wires 21 and 22, and have a longitudinally flattened shape. For example, if the cross-sectional area of ​​the first line portions 211 and 221 is 0.2 mm² 2 This reduces the resistance of each of the lead wires 21 and 22. Also, by making the width W1 / thickness Tk1 of the first wire portions 211 and 221 1 or less, the prominence of the first wire portions 211 and 221 in the power generation module 10 can be suppressed. The width of each of the first wire portions 211 and 221 is, for example, within 0.5m.

[0049] The first wire sections 211 and 221 have a width W1 narrower than that of a normal lead wire, but are longer in the thickness direction, which suppresses an increase in electrical resistance and improves electrical conductivity. In addition, although the lead wires 21 and 22 within the central region 13 are visible from the outside, their vertically flattened shape reduces their visibility, thus preventing the lead wires 21 and 22 from being conspicuous.

[0050] Figure 11 shows the longitudinal sections of the second wire portion 212 of lead wire 21 and the second wire portion 222 of lead wire 22. The second wire portions 212 and 222 have a width W2 that is longer than the thickness Tk2 of lead wires 21 and 22, and have a transversely flattened shape. For example, the thickness Tk2 is 100 μm, and the width W2 is 1 mm to 2 mm, which is about the same as the width of a normal lead wire. The second wire portions 212 and 222 may be formed by workers pressing the first wire portions 211 and 221 with pliers or the like at the installation site, or pre-formed transversely flattened portions may be used. The ratio of the thickness Tk1 of the first wire portion 211 of lead wire 21 to the thickness Tk2 of the second wire portion 212 is, for example, 5 or more. Having a ratio of this magnitude makes it possible to more effectively reduce the visibility of the first wire portions 211 and 221.

[0051] The first wire portion 211 and the second wire portion 212 of lead wire 21 and the connecting lead wire 23 may be formed from a single lead wire. Similarly, the first wire portion 221 and the second wire portion 222 of lead wire 22 and the connecting lead wire 23 may be formed from a single lead wire.

[0052] Furthermore, as shown in Figure 12, in the modified power generation module 10A, the first wire portion 211 and the second wire portion 212 of the lead wire 21 and the connecting lead wire 23 are separate components, and they may be electrically connected by conductive members 24 and 25 such as solder. The conductive member 24 changes shape from vertically flattened to horizontally flattened. The conductive member 25 may change shape from horizontally flattened to match the shape of the connecting lead wire 23.

[0053] Furthermore, as shown in Figure 13, in the modified power generation module 10B, the first wire portion 211 and the second wire portion 212 of the lead wire 21 are separate components, and they may be electrically connected by a conductive material 24 such as solder. Alternatively, the second wire portion 212 may be used as the connecting lead wire 23B.

[0054] [4. Effects, etc.] Thus, the power generation module 10 comprises a first substrate 11 and a second substrate 12 facing each other, a power generation element 100 disposed between the first substrate 11 and the second substrate 12, lead wires 21 and 22 electrically connected to the power generation element 100, and a sealing member 50 disposed between the first substrate 11 and the second substrate 12 along the outer edges of the first substrate 11 and the second substrate 12, sealing the internal space between the first substrate 11 and the second substrate 12. The lead wires 21 and 22 have first wire portions 211 and 221 located in the internal space, and second wire portions 212 and 222 that penetrate the sealing member 50. The ratio of the width W2 of the second wire portions 212 and 222 divided by the thickness Tk2 is greater than the ratio of the width W1 of the first wire portions 211 and 221 divided by the thickness Tk1.

[0055] From the viewpoint of the appearance of the power generation module 10, it is preferable to narrow the width of the lead wires 21 and 22 in a plan view, but in that case, the electrical resistance will increase and the electrical conductivity will decrease. Also, if the thickness of the second wire portions 212 and 222 that penetrate the sealing member 50 increases, the sealing performance of the sealing member 50 may decrease. Therefore, by making the ratio of the width W2 of the second wire portions 212 and 222 divided by the thickness Tk2 larger than the ratio of the width W1 of the first wire portions 211 and 221 divided by the thickness Tk1, the width ratio of the first wire portions 211 and 221 compared to the second wire portions 212 and 222 is reduced, and the thickness ratio of the second wire portions 212 and 222 compared to the first wire portions 211 and 221 is reduced, thereby reducing the visibility of the first wire portions 211 and 221 and improving the sealing performance of the sealing member 50.

[0056] Furthermore, the thickness Tk1 of the first line portions 211 and 221 is longer than the width W1 of the first line portions 211 and 221, and the width W2 of the second line portions 212 and 222 is longer than the thickness Tk2 of the second line portions 212 and 222. By doing so, the visibility of the first line portions 211 and 221 can be reduced and the sealing performance of the sealing member 50 can be improved.

[0057] Furthermore, the cross-sectional areas of the first wire sections 211 and 221 are the same as those of the second wire sections 212 and 222. This makes it possible to make the electrical resistance of the first wire sections 211 and 221 and the second wire sections 212 and 222 the same.

[0058] (Other embodiments) As described above, the above embodiments have been explained as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to these embodiments and can be applied to embodiments that have been modified, replaced, added, or omitted as appropriate. Therefore, other embodiments will be described below as examples.

[0059] (Summary of the embodiment) (1) The power generation module of the present disclosure comprises a first substrate and a second substrate facing each other, a power generation element disposed between the first substrate and the second substrate, lead wires electrically connected to the power generation element, and a sealing member disposed between the first substrate and the second substrate along the outer edges of the first substrate and the second substrate, sealing the internal space between the first substrate and the second substrate. The lead wire has a first wire portion located in the internal space and a second wire portion that penetrates the sealing member. The ratio of the width of the second wire portion to the thickness is greater than the ratio of the width of the first wire portion to the thickness.

[0060] (2) In the power generation module of (1), the thickness of the first wire portion is longer than the width of the first wire portion, and the width of the second wire portion is longer than the thickness of the second wire portion.

[0061] (3) In the power generation module of (1) or (2), the cross-sectional area of ​​the first line portion and the cross-sectional area of ​​the second line portion are the same.

[0062] (4) In any of the power generation modules described in (1) to (3), the ratio of the thickness of the first wire portion to the thickness of the second wire portion is 5 or more.

[0063] (5) In any of the power generation modules described in (1) to (4), the width of the first line portion is 0.5 mm or less. [Industrial applicability]

[0064] This disclosure is useful for power generation modules used in building-integrated photovoltaic power generation. [Explanation of symbols]

[0065] 10, 10A, 10B power generation modules 11. First circuit board 12 Second board 13 Central area 21 Lead wires 211 1st line part 212 Second line part 22 Lead wires 221 1st line part 222 Second line part 23. Connecting lead wires 24 Conductive members 31 First filler 32 Second filler 41a First wiring 42a Second wiring 50 Sealing member 51 Through hole 100 power generation element 120 strings 150 solar cell elements 151 Lower transparent electrode 153 Semiconductor layer 155 Upper transparent electrode 160 Separation groove 161 First Expansion Section 162 Second Expansion Section 171 Copper wire 172 solder layers

Claims

1. A first substrate and a second substrate facing each other, A power generation element disposed between the first substrate and the second substrate, Lead wires electrically connected to the aforementioned power generation element, The first substrate and the second substrate are provided with a sealing member that is positioned along the outer edges of the first substrate and the second substrate and seals the internal space between the first substrate and the second substrate, The lead wire has a first wire portion located in the internal space and a second wire portion that penetrates the sealing member. The ratio obtained by dividing the width of the second line portion by its thickness is greater than the ratio obtained by dividing the width of the first line portion by its thickness. Power generation module.

2. The thickness of the first line portion is longer than the width of the first line portion. The width of the second line portion is longer than the thickness of the second line portion. The power generation module according to claim 1.

3. The cross-sectional area of ​​the first line portion and the cross-sectional area of ​​the second line portion are the same. The power generation module according to claim 2.

4. The ratio obtained by dividing the thickness of the first line portion by the thickness of the second line portion is 5 or more. The power generation module according to claim 2.

5. The width of the first line portion is 0.5 mm or less. The power generation module according to claim 2.

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