Solar cell module output line connection structure

Abstract

To provide an output line connection structure for a solar battery module with which connection work via a cable for external connection can be easily performed.SOLUTION: In a solar battery module 10, an output lead wire 20 provided correspondingly to a solar battery cell string, which is configured by connecting a plurality of solar battery cells in series, is drawn out from the side of a rear face 12. In a cable 40 for external connection, a holding part 511 in which the output lead wire 20 is inserted is provided in a connection terminal part 51 provided in an end at the side of connection with the output lead wire 20. The holding part 511 is connected with a tip end 21 of the output lead wire 20. The cable 40 for external connection is disposed at the rear face side of the solar battery module 10, and the other end is connected with an external electronic apparatus, etc.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an output line connection structure for a solar cell module. [Background technology]

[0002] Photovoltaic power generation systems are widely known in which a plurality of solar cell modules are fixed to the roof or rooftop of a building, the ground, etc. Generally, a solar cell module has a plurality of substantially rectangular solar cells arranged between a light-transmitting substrate and a backsheet, and each solar cell string (connection unit) is provided with an output lead wire that is drawn out to the back side of the solar cell module, opposite the light-receiving surface.

[0003] As shown in Fig. 13, in a conventional solar power generation system, output lead wires 92 are drawn out through slits 91 on the rear surface 902 side of a solar cell module 90, and a terminal box 93 is attached to the output lead wires 92 to extract the output of the solar cell module 90. This type of terminal box 93 generally has a built-in bypass diode. An external connection cable 94 having a connector 95 at its tip is drawn out from the terminal box 93 and is used to connect to other adjacent solar cell modules or external devices (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-357812 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, in addition to constructing solar power generation systems by fixing solar cell modules to buildings or the ground, development has also been progressing to install solar power generation systems that can convert light energy into electrical energy for a variety of uses, such as installing solar cell modules on the surface of automobile bodies or using them as a power source for small electronic devices such as mobile terminals.

[0006] In these cases, unlike the conventional solar power generation systems, there are devices connected to the back side of the solar cell module, so the space on the back side of the solar cell module is limited. Furthermore, since a long service life of several decades is not required, a conventional terminal box or a thickly coated, weather-resistant external connection cable may not be used, and instead, a general electrical cable with a relatively thin coating may be connected to the output lead wires of the solar cell module. However, connecting the output lead wires requires a straight solder connection between the electrical cable and each output lead wire, which results in a complicated connection process. Furthermore, directly soldering the electrical cable to the output lead wires may lead to operational errors, resulting in a lower connection reliability.

[0007] The present disclosure has been made in consideration of the above-mentioned circumstances, and its purpose is to provide an output line connection structure for a solar cell module that allows easy connection work via an external connection cable and is highly reliable. [Means for solving the problem]

[0008] The solution of the present disclosure for achieving the above-mentioned object is an output line connection structure for a solar cell module that connects an output line extended from the solar cell module to an external connection cable, wherein the solar cell module includes at least one solar cell string in which a plurality of solar cells are connected in series, the output line is provided corresponding to the solar cell string and is drawn out from the back surface of the solar cell module opposite the light-receiving surface, the external connection cable is provided with a connection terminal portion at an end on the connection side with the output line, the connection terminal portion is provided with a holding portion into which the output line is inserted, a connection portion between the holding portion and the tip of the output line is provided on the back surface of the solar cell module, the external connection cable is arranged on the back surface of the solar cell module, and the other end of the external connection cable opposite the connection side end is connected to an external electronic device or a terminal box.

[0009] Furthermore, in the output line connection structure of the solar cell module, it is preferable that the output line is a band-shaped conductor plate, the holding portion is configured to be approximately cylindrical with a gap, and the tip of the output line is inserted and crimped to connect it.

[0010] In the output line connection structure of the solar cell module, the output line may have a tapered portion whose width narrows toward its tip.

[0011] Furthermore, in the output wire connection structure of the solar cell module, the holding portion may be configured to have an approximately cylindrical shape with a gap, and the tip of the output wire may be configured to have an approximately cylindrical shape that is tapered toward the tip so that it can be inserted into the holding portion, and the tip of the output wire may be inserted into the holding portion and crimped and connected.

[0012] Furthermore, in the output line connection structure of the solar cell module, the solar cell string may include a plurality of solar cell groups in which adjacent solar cells are connected in series along a first direction, and output wiring material connecting the ends of the solar cell groups is provided along a second direction perpendicular to the first direction, and one end of the output wiring material may be pulled out to the back surface side along the first direction or the second direction to form the output line.

[0013] In the output line connection structure for a solar cell module, a resilient contact piece for clamping the output line may be provided inside the holding portion.

[0014] In the output line connection structure for a solar cell module, the output line may have a bent portion at the tip end that is bent back, and the bent portion may be engaged with the elastic contact piece. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to easily perform connection work via an external connection cable in a solar cell module, and further to improve the reliability of the connection. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a plan view showing the back surface side of a solar cell module according to a first embodiment of the present disclosure, illustrating a main part of an output line connection structure for the solar cell module. [Figure 2] FIG. 2 is a perspective view showing a state before an output lead wire of the solar cell module is connected to an external connection cable. [Figure 3] FIG. 2 is a perspective view showing an example of the solar cell module. [Figure 4] FIG. 10 is a partially enlarged view showing another example of the output lead wire. [Figure 5] FIG. 2 is a perspective view showing an example of a connection side end portion of the external connection cable. [Figure 6]FIG. 10 is a perspective view showing a connection side end of an external connection cable in an output line connection structure for a solar cell module according to a second embodiment of the present disclosure. [Figure 7] 4 is a perspective view showing an example of a tip portion of an output lead wire corresponding to the external connection cable. FIG. [Figure 8] FIG. 10 is a plan view schematically illustrating a part of an output line connection structure for a solar cell module according to a third embodiment of the present disclosure, showing the back surface side of the solar cell module. [Figure 9] FIG. 10 is a plan view schematically showing the back surface side of the solar cell module in the output line connection structure of the solar cell module according to a fourth embodiment of the present disclosure. [Figure 10] FIG. 10 is a cross-sectional view showing a connection terminal portion in an output line connection structure of a solar cell module according to a fifth embodiment of the present disclosure. [Figure 11] FIG. 10 is a cross-sectional view showing another example of the connection terminal portion. [Figure 12] 4 is a cross-sectional view showing an output lead wire connected to the connection terminal portion. FIG. [Figure 13] FIG. 10 is a perspective view showing a conventional output line connection structure of a solar cell module. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an output line connection structure of a solar cell module according to an embodiment of the present disclosure will be described with reference to the drawings. Note that components common to the following embodiments 1 to 5 are designated by common reference numerals, and duplicated explanations will be omitted.

[0018] (Embodiment 1) Fig. 1 is a plan view showing an output line connection structure of a solar cell module 10 according to a first embodiment of the present disclosure, and Fig. 2 is a perspective view showing a state before an output lead wire 20 of the solar cell module 10 is connected to an external connection cable 40. Fig. 3 is a perspective view showing an example of a solar cell module 10 to which the output line connection structure of the present disclosure is applied.

[0019] 1 shows the back surface 12 side of the solar cell module 10, and the solar cell 13, output wiring members 15a, 15b, etc., which are not visible from the back surface 12 side due to the back sheet 16 that constitutes the back surface 12, are shown by dashed lines. In Fig. 3, the light-receiving surface 11 side of the solar cell module 10 is shown, and the resin layer, translucent substrate, etc., provided on the solar cell module 10 are not shown. In the following description, the surface of the solar cell module 10 onto which sunlight is mainly incident is referred to as the light-receiving surface 11, and the surface opposite thereto is referred to as the back surface 12.

[0020] As shown in Figure 3, the solar cell module 10 of the exemplary embodiment includes a plurality of solar cells 13 and a plurality of wiring materials (14, 15) that interconnect the solar cells 13 connected in series, and has a structure sealed between a translucent substrate on the light-receiving surface 11 side and a back sheet 16 (see Figure 1) on the back surface 12 side.

[0021] In the illustrated embodiment, the solar cell module 10 has adjacent solar cells 13 connected in series in the first direction D1 by wiring members 131, forming a solar cell string in which a plurality of solar cells 13 are arranged in a row. The solar cells 13 are flat photovoltaic elements that generate power when irradiated with light, and adjacent solar cells 13 in the first direction D1 are connected in series. Furthermore, for example, the solar cell module 10 may be configured to have a curved shape that is curved in the first direction D1 and the second direction D2 as a whole so that it can be mounted on the roof of a vehicle, and the solar cells 13 are arranged along the curved shape.

[0022] The plurality of solar cells 13 are linearly arranged along the first direction D1 and connected in series to form a solar cell string. In two solar cell strings adjacent to each other in the second direction D2, the solar cells 13 at one end in the first direction D1 are connected in series via relay wiring material 14, and the solar cells 13 at the other end in the first direction D1 are connected in series via output wiring material 15a. In this way, all of the plurality of solar cells 13 in the solar cell module 10 are connected in series.

[0023] At the other end in the first direction D1, for example, a total of four output wiring members 15a, 15b are provided for electrical connection to the external connection cable 40. The surfaces of the output wiring members 15a, 15b may be covered with an insulating member such as an insulating film. Of these, output wiring member 15a also has the function of connecting two adjacent solar cell strings in series. Furthermore, output wiring member 15b at one end is electrically connected to the solar cell string on the high potential side in the second direction D2, and output wiring member 15b at the other end is electrically connected to the low potential side of the solar cell string.

[0024] As shown in Fig. 2, the end of each output wiring member 15a, 15b located approximately in the center of the solar cell module 10 in the second direction D2 is drawn out to the rear surface 12 side of the solar cell module 10 through a through-hole 17 provided in the back sheet 16, and serves as an output lead wire (output wire) 20 for external connection. Therefore, the four tab-shaped output lead wires 20 shown in Fig. 2 are provided corresponding to each solar cell string. The output lead wires 20 extended out to the rear surface 12 side are connected to one end (connection side end) of an external connection cable 40, and the other end of the external connection cable 40 opposite to the connection side end is connected to an external electronic device such as an electrical component or a terminal box.

[0025] The output lead wires 20 are each a strip-shaped conductive plate, and are formed as strip-shaped wiring materials (bus bars) having a configuration in which the outer surface of a base material formed in the shape of a long, thin ribbon (or strip) is coated with a conductive adhesive or solder. The material of the base material is not particularly limited, but metals such as copper can be used.

[0026] As shown in Fig. 2, the external connection cable 40 has a connection terminal 51 at the end on the connection side with the output lead wire 20. The external connection cable 40 is an electrical cable used to connect to electrical components, electronic devices such as batteries, or terminal boxes connected to the solar cell module 10, and the connection terminal 51 is a metal terminal to which a core wire (not shown) of the external connection cable 40 is connected. As the electrical cable, for example, a cable with an insulating coating and a core wire with a cross-sectional area of 2 sq (square, JIS standard, AWG14 (UL standard)) can be used. Various electrical cables can be used depending on the current value.

[0027] The connection terminal portion 51 is provided with a holding portion 511 into which the output lead wire 20 is inserted. The holding portion 511 is provided integrally with the tip side of the connection terminal portion 51, and is formed in a deformable, approximately cylindrical shape.

[0028] The tip 21 of the output lead wire 20 is inserted into a holding portion 511 of an external connection cable 40 routed around the rear surface 12 of the solar cell module 10. As shown in Fig. 1 , the output lead wire 20 is sheathed with the holding portion 511, and a connection portion 30 between the holding portion 511 and the output lead wire 20 is provided on the rear surface 12 side of the solar cell module 10. The connection portion 30, the output lead wire 20, and the through hole 17 are preferably insulated by attaching an insulating film (tape) or by coating with an insulating resin such as silicone.

[0029] 4 is a partially enlarged view showing another example of the output lead wire 20. As shown in the figure, on the rear surface 12 side of the solar cell module 10, the tip portion 21 of the output lead wire 20 is drawn out through a through-hole 17 formed in the back sheet (rear surface protective sheet) 16. The output lead wire 20 is not limited to having a rectangular band shape, and may have a shape provided with a tapered portion 22 that narrows toward the tip. This makes it easier to insert the tip portion 21 of the output lead wire 20 into the holding portion 511 of the connection terminal portion 51, and also makes the connection work easier.

[0030] Fig. 5 is a perspective view showing an example of the connection side end portion of the external connection cable 40. As shown in Fig. 5, the connection terminal portion 51 has, at one end (X1 side in the figure), a holding portion 511 that allows the output lead wire 20 to be inserted, and at the other end (X2 side in the figure), a fixing portion 512 that crimps the core wire of the external connection cable 40.

[0031] The holding portion 511 is integrally formed at one end of the connection terminal portion 51 and has a generally cylindrical shape, into which the output lead wire 20 is inserted. In the embodiment shown in FIG. 5 , the holding portion 511 has a pair of holding pieces, each of which has a curved edge on both sides in the width direction, facing each other with a gap (slit), and each of which is generally U-shaped, forming a generally cylindrical shape. Because of this shape, the holding portion 511 is configured such that the tip end 21 of the output lead wire 20 is directly inserted therein, and then further bent and deformed to be crimped and connected to the tip end 21, thereby forming the connection portion 30. A connection hole 23 may be provided in the middle of the tip end 21 of the output lead wire 20, in which case it can be connected to a protrusion 513 of the holding portion 511. The tip end 21 of the output lead wire 20 and the holding portion 511 may be further connected and fixed by soldering.

[0032] A flat terminal (for example, a 250-type flat female terminal) or the like can be used as the connection terminal portion 51. When a flat terminal is used, the shape of the output lead wire 20 may be a tab (or strip) as exemplified in Fig. 2 or a shape having a tapered portion 22 as exemplified in Fig. 4, as long as the width, thickness, etc. are compatible.

[0033] In the illustrated embodiment, the connection part 30 formed by connecting the holding part 511 and the tip part 21 of the output lead wire 20, and the external connection cable 40 are disposed on the rear surface 12 side of the solar cell module 10. The output lead wire 20 can be connected to the terminal box via the external connection cable 40, rather than being directly connected to the terminal box. Therefore, the position of the output lead wire 20 and the position of the terminal box may be separated, which significantly increases the degree of freedom in the installation position of the bypass diode (terminal box).

[0034] For example, when attaching the solar cell module 10 to a vehicle or electronic device, there are often space restrictions on the back side of the solar cell module, so this structure, which allows the position of the terminal box to be freely set, is extremely useful. Furthermore, although it is expected that the position at which the terminal box can be attached will differ depending on the electronic device to which it is attached, this structure allows the solar cell module structure up to the output lead wire 20 to be standardized regardless of the electronic device to which it is attached, thereby reducing manufacturing costs.

[0035] Furthermore, when connecting the external connection cable 40 to a terminal box that incorporates a bypass diode, the external connection cable that is led out from the terminal box can also be easily connected to electronic devices by using the electrical cable.

[0036] In the first embodiment, the structure is based on the premise that the output lead wire 20 is connected to a bypass diode, but as a simpler system, for example, only the output lead wire 20 connected to two output wiring members 15b is used, and the output taken out via the external connection cable 40 has its voltage converted by a power converter such as a DC / DC converter, and is charged in a battery or the like, which can be used as a power source. In this way, the terminal box can be eliminated, and installation space and costs can be reduced.

[0037] In addition, in this structure, connection to the external connection cable 40 can be achieved simply by inserting the tip 21 of the output lead wire 20 into the connection terminal portion 51, making the operation simple and preventing operational errors.Furthermore, since the tip 21 is crimped to the connection terminal portion 51, it is less likely to come loose, making the connection more reliable.

[0038] In the output line connection structure of the solar cell module 10 of the present disclosure, the solar cell module 10 is not limited to the form exemplified in Fig. 3 etc., and may be configured in any manner. Furthermore, the number of output lead wires 20 drawn out from such a solar cell module 10 is not limited to the four illustrated, and may be any number, and the drawing positions of the output lead wires 20 are not limited to the positions illustrated, and may be provided in multiple locations.

[0039] (Embodiment 2) In the present disclosure, the output line connection structure of the solar cell module 10 is not limited to that shown in the first embodiment, and the connection side end of the external connection cable 40 and the tip of the output lead wire 20 may be configured as shown in Figures 6 and 7, for example. In the following description, the basic configuration of the solar cell module 10 is the same as that of the first embodiment, so common reference numerals are used to indicate the basic configuration and redundant description will be omitted.

[0040] FIG. 6 is a perspective view showing another example of the connection side end of the external connection cable 40, and FIG. 7 is a perspective view showing the shape of the tip of the output lead wire 20 corresponding to the external connection cable 40 shown in FIG.

[0041] 6, the holding portion 521 of the connection terminal portion 52 may be in the form of a female bullet terminal having a pair of holding pieces facing each other with a gap therebetween, forming a generally cylindrical shape. The connection terminal portion 52 has, at one end on the X1 side, the generally cylindrical holding portion 521 that allows the output lead wire 20 to be inserted, and at the other end on the X2 side, a fixing portion 522 that crimps the core wire of the external connection cable 40. The connection terminal portion 52 can be a female bullet terminal (e.g., CB104, JIS standard) or the like.

[0042] The holding portion 521 of the connection terminal portion 52 is shaped to engage with the tip portion 21a of the output lead terminal 20 when inserted. In this case, the tip portion 21a of the output lead wire 20 is preferably formed in the shape of a male bullet terminal, as shown in Fig. 7. The tip portion 21a is tubular with a diameter tapering toward the tip, has a circumferential groove 211 on its outer circumferential surface, and is shaped in length, outer diameter, etc. to correspond to the holding portion 521. The tip portion 21 of the male bullet-shaped output lead wire 20 is inserted into the holding portion 521 of the connection terminal portion 52, which is shaped like a female bullet terminal, and the two are mechanically fixed and electrically connected.

[0043] In addition, even in the holding portion 521 having such a shape, the tip portion 21 of the output lead wire 20 may be directly inserted and crimped and connected, and further may be connected and fixed by soldering.

[0044] In this embodiment as well, the connection portion 30 formed by connecting the holding portion 521 of the connection terminal 52 to the tip portion 21 of the output lead wire 20, and the external connection cable 40 are disposed on the rear surface 12 side of the solar cell module 10. This allows the output lead wire 20 to be connected via the external connection cable 40 rather than directly to the terminal box. Therefore, similar to the first embodiment, the degree of freedom in the installation position of the bypass diode (terminal box) can be increased. Furthermore, as a simpler system, for example, only the output lead wires 20 connected to two output wiring members 15b are used, and the voltage of the output taken out via the external connection cable 40 is converted by a power converter such as a DC / DC converter, and the output is charged into a battery or the like and can be used as a power source.

[0045] (Embodiment 3) In the present disclosure, the output line connection structure of the solar cell module 10 is not limited to that shown in the first embodiment, and may be configured as shown in FIG. 8, for example.

[0046] Fig. 8 is a plan view showing the output line connection structure of a solar cell module 10 according to a third embodiment of the present disclosure, illustrating the back surface 12 side of the solar cell module 10. In Fig. 8, solar cells 13, output wiring members 15c, etc. that are not visible from the back surface 12 side due to the back sheet 16 that constitutes the back surface 12 are indicated by dashed lines.

[0047] The solar cells 13 are connected in series in the first direction D1 by wiring members 131 to form a group of solar cells 13 connected in series in which a plurality of solar cells 13 are arranged in a row, and output wiring members 15c, 15d are connected to the ends of the solar cells 13. The output wiring members 15c, 15d are arranged along the second direction D2, and one of the ends is drawn out to the back surface 12 of the solar cell module 10 through a through hole 17 for electrical connection to an external connection cable 40. The output wiring member 15c connects two adjacent groups of solar cells 13 in series, and the output wiring member 15d has the function of extracting the output of the solar cell module 10 to the outside.

[0048] 8, output wiring member 15c and output wiring member 15d are oriented in a wiring direction along second direction D2 and are drawn out through through-hole 17 to rear surface 12, where they serve as output lead wires (output wires) 20 for external connection. Output lead wires 20 extending out to rear surface 12 are connected to connection terminal portions 51 of external connection cables 40 that are connected to electrical components or the like.

[0049] In this way, by drawing the output wiring members 15c, 15d to the rear surface 12 while keeping them oriented in the wiring direction, the ends of the output wiring members 15c, 15d can be made into output lead wires 20 without processing them, and no additional connection processing is required to orient them in an L-shape in the first direction D1, simplifying the work process and improving workability.

[0050] (Embodiment 4) Fig. 9 is a plan view showing the output line connection structure of the solar cell module 10 according to the fourth embodiment, illustrating the back surface 12 side of the solar cell module 10. In Fig. 9, solar cells 13, output wiring members 15c, 15d, etc., which are not visible from the back surface 12 side due to the back sheet 16 that constitutes the back surface 12, are indicated by dashed lines.

[0051] The output line connection structure of the solar cell module 10 may be further configured as shown in Fig. 9. In the solar cell module 10 shown in Fig. 9, the output wiring members 15c, 15d are also drawn directly to the rear surface 12 side through the through holes 17 with their wiring direction aligned with the second direction D2, and are used as output lead wires (output wires) 20 for external connection.

[0052] 9 is mounted on the back sheet 16 on the rear surface 12, and is configured to include a plurality of terminal sections to which terminals of the external connection cables 40 are connected, and bypass diodes 61 connected to the terminal sections. In the illustrated embodiment, there are six bypass diodes 61 in the terminal box 60, and an external output cable 62 for extracting the output of the solar cell module 10 is also provided at the end terminal section of the plurality of terminal sections.

[0053] 9, seven solar cell modules 13 arranged in a first direction D1 are connected in series by wiring material 131. In the illustrated embodiment, six rows of such series-connected solar cell cells 13 are arranged in a second direction D2.

[0054] The groups of solar cells 13 arranged at both ends in the second direction D2 are connected to output wiring member 15d at one end in the first direction D1 (the upper end in the figure), and are connected in series with adjacent groups of solar cells 13 in one row by output wiring member 15c at the other end. Output wiring member 15d is connected to external output cable 62 of terminal box 60 via external connection cable 40, and also serves to extract output from solar cell module 10. Other adjacent groups of solar cells 13 in one row are connected in series by output wiring member 15c. Solar cell module 10 is provided with a solar cell string in which a total of 42 solar cells 13 connected in series are arranged in a 7 x 6 configuration.

[0055] As a result, the bypass diodes 61 are connected in parallel to the start and end of one row of solar cell 13 groups consisting of seven solar cell 13 via the output lead wires 20 and the external connection cables 40. The solar cell module 10 has six solar cell 13 groups arranged in the second direction D2, and is provided with a circuit configuration in which each of the solar cell 13 groups in one row is connected in parallel to a bypass diode 61 in the terminal box 60.

[0056] As mentioned above, when the solar cell module 10 is used as a power source for a vehicle or a portable device, it is more susceptible to the effects of shadows, such as when the vehicle passes through a shaded area, than when the solar cell module is installed in a fixed position. In contrast, in the solar cell module 10 shown in Figure 9, when the solar cell module 10 is generating power normally, no current flows through the bypass diode 43. However, if some solar cells 13 are shaded by a structure or the like and power generation becomes insufficient, the solar cells 13 act as resistors, and the bypass diode 43 activates. As a result, the row of solar cell groups 13 including the shaded solar cell 13 are bypassed, but the power generation capacity decreases only in the row including the shaded solar cell 13, while the other five rows of solar cell groups 13 are not affected by the shadow, so the decrease in power generation can be suppressed compared to when two rows are connected in parallel to the bypass diode.

[0057] In this case, the output lead wires 20 are drawn out to the rear surface 12 side and connected to the terminal box 60 on the rear surface 12 via the external connection cable 40, so that even if the number of bypass diodes to be connected increases, the internal wiring of the solar cell module 10 does not become complicated and wiring can be easily performed. There is no need to wire the solar cell 13 and the output wiring members 15c, 15d in an overlapping manner within the solar cell module 10, and damage such as cracking of the solar cell 13 can be prevented. Furthermore, as described above, the output lead wires 20 drawn out to the rear surface 12 side can be easily connected to the external connection cable 40, so even if there are many connections, the connection work can be simplified, improving workability.

[0058] The number of solar cells 13 included in one row of solar cell group 13 is not limited to the illustrated seven, but may be any number of smaller units. Furthermore, the total number of solar cells 13 (number of series) constituting solar cell module 10 is not limited to the illustrated configuration.

[0059] (Embodiment 5) In the present disclosure, the output line connection structure of the solar cell module 10 is not limited to the configurations shown in the first to fourth embodiments, and further, the connection terminal portion 51 of the external connection cable 40 may be configured as described below.

[0060] Figure 10 is a cross-sectional view showing the output line connection structure of a solar cell module according to embodiment 3 of the present disclosure, along with the structure of the connection terminal portion 53 of the external connection cable 40, Figure 11 is a cross-sectional view showing another example of the connection terminal portion 53 of the external connection cable 40, and Figure 12 is a cross-sectional view showing the output lead wire 20 connected to the connection terminal portion 53 shown in Figure 11.

[0061] 10, external connection cable 40 has, as connection terminal portion 53, a cylindrical holding portion 531 made of an insulating material such as resin, and an elastically deformable elastic contact piece 532 provided inside holding portion 531. Elastic contact piece 532 is a metal terminal to which a core wire (not shown) of external connection cable 40 is connected, and is configured to clamp tip portion 21 of output lead wire 20 by its elastic force.

[0062] 10, the resilient contact piece 532 has upper and lower pieces 533 and 534, which are curved leaf spring-like and arranged facing each other vertically. The gap (distance) between the downwardly curved upper piece 533 and the upwardly curved lower piece 534 is set to be equal to or smaller than the thickness of the output lead wire 20.

[0063] 10 , the holding portion 531 of the external connection cable 40 is brought close to the tip 21 of the output lead wire 20, and the tip 21 is inserted between the upper piece 533 and the lower piece 534 of the resilient contact piece 532. In the connection terminal portion 53, the output lead wire 20 is clamped between the upper piece 533 and the lower piece 534 of the resilient contact piece 532, and the output lead wire 20 and the external connection cable 40 are connected.

[0064] The resilient contact piece 532 is not limited to a configuration in which both the upper piece 533 and the lower piece 534 are elastically deformable, and either the upper or lower piece may be provided to be elastically deformable within the holding portion 531, as shown in Fig. 11. In Fig. 11, the resilient contact piece 532 of the holding portion 531 is provided in the shape of a leaf spring with an upper piece 535 having a curved shape that is bent downward, and the elastic force of this leaf spring enables the tip portion 21 of the output lead wire 20 to be clamped between the upper piece 535 and the flat plate-shaped lower piece 536.

[0065] 12, the output lead wire 20 may be configured to have a bent portion 24 in which the tip portion 21 is bent back toward the through-hole 17. In this case, the bent portion 24 of the output lead wire 20 is engaged with the upper piece 535 of the elastic contact piece 532, thereby preventing it from coming off.

[0066] Even with the output line connection structure of the solar cell module 10 configured as described above, the output lead wire 20 can be connected via the external connection cable 40 rather than directly to the terminal box. This allows for flexible configuration without the need for precise positioning of the terminal box, enabling quick and space-saving connection work. Furthermore, the solar cell module structure up to the output lead wire 20 can be standardized regardless of the electronic device to be installed, thereby reducing manufacturing costs. When connecting the external connection cable 40 to a terminal box incorporating a bypass diode, the external connection cable extending from the terminal box can also be connected to the electronic device by using the electrical cable. The output voltage extracted from the output lead wire 20 via the external connection cable 40 can be converted by a power converter such as a DC / DC converter, charged into a battery, etc., and used as a power source. This configuration eliminates the need for a terminal box, thereby reducing installation space and costs.

[0067] The above-disclosed embodiments are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-disclosed embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0068] 10. Solar cell modules 11 Photosensitive surface 12 Back side 13 Solar Cells 14 Relay wiring material 15a, 15b, 15c, 15d Output wiring material 16 Back Seat 17 Through hole 20 Output lead wire (output wire) 21 Tip 22 Tapered section 23 Connection hole 24 Bend section 30 Connection 40 External connection cable 51, 52, 53 Connection terminals 511, 521, 531 Holding part 512, 522 Fixed part 532 Elastic contact piece 533, 535 upper piece 534, 536 lower piece 60 Terminal box 61 Bypass diode 62 External output cable

Claims

1. An output line connection structure for a solar cell module that connects an output line extending from the solar cell module to an external connection cable without using a terminal box, The solar cell module includes at least one solar cell string in which a plurality of solar cells are connected in series; the output lines are provided corresponding to the solar cell strings, are drawn out through through holes that open on a back surface side opposite to a light-receiving surface of the solar cell module, and extend in a planar direction of the back surface, the external connection cable is provided with a connection terminal portion at an end portion on the side connected to the output line, and the connection terminal portion is provided with a holding portion into which the output line is inserted; an output wire connection structure for a solar cell module, characterized in that the output wire is inserted into and connected to the holding portion of the external connection cable without being inserted into a terminal box, the connection portion between the holding portion and the tip of the output wire is provided on the back side of the solar cell module, the connection portion is provided away from the through hole in the planar direction of the back surface, the external connection cable is arranged on the back side of the solar cell module, and the other end of the external connection cable opposite to the connection side end is connected to an external electronic device or a terminal box.

2. The output line connection structure of a solar cell module according to claim 1, The holding portion is provided to have a substantially cylindrical shape, a tip end of the output line is tapered toward the tip end to form a generally cylindrical shape that can be inserted into the holding portion, An output wire connection structure for a solar cell module, characterized in that a tip end of the output wire is inserted into the holding portion and crimped and connected.

3. The output line connection structure of a solar cell module according to claim 1, the output line is a strip-shaped conductor plate, the connection terminal portion is a flat terminal, The holding portion has a pair of holding pieces formed on both side edges in the width direction so as to face each other, and the holding pieces are substantially U-shaped, An output wire connection structure for a solar cell module, characterized in that the tip of the output wire is inserted into the pair of holding pieces and crimped and connected.

4. The output line connection structure of a solar cell module according to claim 3, The output line connection structure of a solar cell module, wherein the output line has a tapered portion whose width narrows toward its tip.

5. In the output line connection structure of the solar cell module according to claim 3 or 4, the output line has a connection hole at its tip, the holding portion includes a protrusion, An output line connection structure for a solar cell module, wherein the connection hole and the protrusion are connected.

6. The output line connection structure of a solar cell module according to claim 1, the output line is a strip-shaped conductor plate, an upper piece and a lower piece are provided facing each other on the inside of the holding portion to hold the tip end of the output line; 1. An output line connection structure for a solar cell module, wherein at least one of the upper piece and the lower piece is an elastic contact piece.

7. The output line connection structure of a solar cell module according to claim 6, The output line connection structure for a solar cell module, wherein the output line has a bent portion where the tip end is folded back, and the bent portion is engaged with the elastic contact piece.

8. The output line connection structure of a solar cell module according to claim 1, the solar cell string includes a plurality of solar cell groups in which a plurality of solar cell strings adjacent to each other along a first direction are connected in series, and output wiring members connecting ends of the solar cell strings are provided along a second direction perpendicular to the first direction; an output wire connection structure for a solar cell module, characterized in that one end of the output wiring material is pulled out through the through hole to the back surface side along the first direction or the second direction, and extends from the through hole in the planar direction of the back surface while maintaining an orientation along the first direction or the second direction to form the output wire.

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