JP5478369B2 - Solar cell module - Google Patents

Description

  The present invention relates to a solar cell module that converts light energy such as the sun into electrical energy, and more particularly to a wiring method for electrically connecting a plurality of solar cell modules installed side by side on a roof or the like. .

  In general, in a solar power generation system, a solar cell module is installed by mounting a module installation member such as a mount on a roof structure of a house, and a plurality of solar cell modules arranged vertically and horizontally on the module.

  The solar cell module receives sunlight and generates DC power. The DC power is input to the power conditioner via the connection box, and converted to AC in the power conditioner. The AC power is consumed by the load (electric equipment) in the house, and the surplus is made to flow backward to the power system.

  The AC voltage output from the power conditioner is 200V AC for use in a residential load or for reverse power flow to the power system. The DC voltage required for conversion to AC200V requires about DC200V. Since the generated voltage per solar cell module is generally 20 to 50 V, several solar cell modules are connected in series on the roof, and the voltage is raised to the power conditioner via the connection box. I try to capture it.

  As for the connection and wiring of the solar cell module on the roof, the simplest possible work is desired due to restrictions on the working environment. Conventionally, a wiring method as disclosed in Patent Document 1 has been proposed.

JP 2004-186548 A

  However, in the conventional method as described above, first, a required number of solar cell module groups are connected in series, and then cables (+ pole and -pole) from the solar cell modules at both ends of the group are separately roofed. Connected to the trunk line wired above, the trunk line is drawn into the junction box, and taken into the inverter through the junction box. Moreover, about parallel connection, it can implement | achieve by connecting several sets of the same series solar cell module group, and connecting the both ends sequentially. Therefore, the number of necessary wiring connection work increases, such as cable connection between each module terminal box in the series group, cable connection between the terminal boxes at both ends of the series module group, and cable connection from the both end modules to the main line. Those tasks must be carried out on an unstable roof. Further, in addition to the series connection and the parallel connection, trunk cables (+ and-) are required, and the cable length for wiring of the solar cell module on the roof has been a problem.

  Rather than the trunk line system as described above, one end (for example, eaves side) of a solar cell module connected in series (for example, a positive pole) and the other end (for example, a ridge side) cable (for example, negative) There is also a method of stretching the cable with an extension cable and connecting it to a junction box installed under the eaves, for example. This is performed for each parallel module group (the connection box has a role of collecting a plurality of inputs and sending them to the inverter). In this case, although the number of connection points is reduced, an extension cable for wiring from the module at the end on the ridge side to the connection box is required, and this is necessary for the number of parallel connections, which also increases the cable length for wiring. It was an issue.

The present invention has been made to solve the above-described problems, and can be easily connected on the roof, and does not require an extra trunk cable or extension cable for wiring. and to provide a module.

In order to solve the above-described problems and achieve the object, a solar cell module according to the present invention is a solar cell module having a positive electrode and a negative electrode, and one of the negative electrode and the positive electrode is electrically connected to one end. A connection cable that is connected and provided with a first connection at the other end, a third connection provided at the other of the negative and positive poles, and a second connection that accommodates the first connection. A first connector in which the first connector is disposed, a second connector in which the third connector is accommodated and a fourth connector is disposed and which can be coupled to the first connector, and one end of the second connector in the second connector A solar cell module with a cable, comprising: a folded cable electrically connected to the fourth connection portion at the other end; and a terminal box having a housing; The cable is integrated with a covering material to form a double-wire cable And, multi-line cable has a length enough to be fitted to the second connector of the solar cell module in which the first connector adjacent the second connector is fixed to the housing of the terminal box When the first connector and the second connector of the adjacent solar cell module are coupled, the first connection portion and the third connection portion of the adjacent solar cell module are electrically connected, and the second And the fourth connecting portion of the adjacent solar cell module are electrically connected.

  According to the present invention, with the above configuration, the solar cell module can be easily connected on the roof, and a solar cell module that does not require a trunk cable or an extension cable for wiring can be obtained. There is an effect.

FIG. 1 is a front view of Embodiment 1 of a solar cell module according to the present invention as a reference example . FIG. 2 is a side view of Embodiment 1 of the solar cell module according to the present invention as a reference example . FIG. 3 is a back view of Embodiment 1 of the solar cell module according to the present invention as a reference example . FIG. 4 is a diagram showing a state in which the terminal box of Embodiment 1 is opened as a reference example . FIG. 5 is a diagram of a solar cell module array in which the solar cell modules of Embodiment 1 are connected in series as a reference example . FIG. 6 is a diagram of a short-circuit means for connecting in series the solar cell modules showing Embodiment 1 of the present invention as a reference example . FIG. 7 is a diagram illustrating a state in which a terminal box cover of the solar cell module according to Embodiment 2 is opened. FIG. 8 is a diagram of a solar cell module array in which the solar cell modules of Embodiment 2 are connected in series.

Embodiment 1 ( reference example)
FIG. 1 is a front view of Embodiment 1 of a solar cell module according to the present invention as a reference example . FIG. 2 is a side view of Embodiment 1 of the solar cell module according to the present invention as a reference example . FIG. 3 is a back view of Embodiment 1 of the solar cell module according to the present invention as a reference example . FIG. 4 is a diagram showing a state in which the terminal box of Embodiment 1 is opened as a reference example . FIG. 5 is a diagram of a solar cell module array in which the solar cell modules of Embodiment 1 are connected in series as a reference example . FIG. 6 is a diagram of a short-circuit means for connecting in series the solar cell modules showing Embodiment 1 of the present invention as a reference example .

  As shown in FIG. 1 to FIG. 3, in the solar cell module 80, a plurality of solar cells 11 are arranged in a plane in the vertical and horizontal directions, and the light receiving surface side is covered with the surface cover material 12, and the back surface The side is covered with a back cover member 13 to form a solar cell panel 14. Further, the peripheral portion of the solar cell panel 14 is sandwiched and protected by a metal frame member 15.

  The front surface electrode of the solar battery cell 11 and the back electrode of the adjacent solar battery cell 11 are sequentially connected, and the plurality of solar battery cells 11 are connected in series. In one solar cell module 80, all the solar cells 11 constituting the solar cell module 80 are connected in series, and the negative electrode of the solar cell module 11 at the end is the negative electrode of the solar cell module 80. The + electrode of the battery cell 11 is the + electrode of the solar battery module 80. The terminal box 20 is attached to the back surface of the solar cell module 80, and the negative electrode of the terminal solar cell 11 and the positive electrode of the starting solar cell 11 are drawn into the terminal box 20 by wiring.

  In FIG. 4, the negative electrode 16 of the terminal solar cell 11 and the positive electrode 17 of the starting solar cell 11 are drawn into the upper portion of the terminal box 20 in FIG. 4. The electrode 16 is connected to one end of the negative electrode cable (connection cable) 21 via the first terminal plate 18 in the terminal box 20. A first connection part (connection terminal) 21 a is provided at the other end of the polar cable 21. The + electrode 17 is connected to one end of a + pole cable (connection cable) 22 through the second terminal plate 19 in the terminal box 20. A third connection portion (connection terminal) 22 a is provided at the other end of the positive electrode cable 22.

  On the other hand, the folded cable 23 and the folded cable 24 extend in parallel substantially along the negative electrode cable 21 and the positive electrode cable 22 respectively. The folded cable 23 and the folded cable 24 are continuous in the terminal box 20, and are configured as a single seamless third cable 25 from a portion along the −pole cable 21 to a portion along the + pole cable 22. Has been. A second connection portion (connection terminal) 23 a is provided at the end of the return cable 23 opposite to the terminal box 20. The pole cable 21 and the folded cable 23 are two-core multi-wire cables in which two core wires are integrally molded with a coating material such as resin, and constitute a first double-wire cable 28. Similarly, a fourth connection portion (connection terminal) 24a is provided at the end of the return cable 24 opposite to the terminal box 20, and the + pole cable 22 and the return cable 24 are two-core double-wire cables. A second double-wire cable 29 is configured.

  The first connecting portion (connecting terminal) 21a is disposed in a housing made of an insulating material (for example, resin) together with the second connecting portion (connecting terminal) 23a, and constitutes the first connector 26. Yes. An insulating wall is provided between the first connection portion (connection terminal) storage portion and the second connection portion (connection terminal) storage portion in the housing, and is electrically separated (insulated). Similarly, the third connecting portion (connecting terminal) 22 a is disposed in the housing together with the fourth connecting portion (connecting terminal) 24 a, and constitutes the second connector 27. An insulating wall is provided between the third connection portion (connection terminal) storage portion and the fourth connection portion (connection terminal) storage portion in the housing, and is electrically separated (insulated).

  Here, the first connector 26 and the second connector 27 have a structure that can be fitted, and in the fitted state, the first connection portion 21a and the third connection portion 22a come into contact with each other electrically. The second connecting portion 23a and the fourth connecting portion 24a are in contact with each other and electrically connected.

  The solar cell modules 80 having the above-described configuration are installed side by side on the roof of a house, for example. The direct current output of each solar cell module 80 is input to the power conditioner by connecting the modules in series and increasing the output voltage. The power conditioner converts direct current power from the solar cell module 80 into alternating current power and consumes it with a load in a house or allows surplus power to flow backward to the power system.

The series connection between the solar cell modules 80 will be described with reference to FIG. To series connect n pieces of solar cell modules installed side by side on the roof, first endmost solar cell module of the n sheets lined solar cell module (the first solar cell module 80A) + pole cable Bed The second connector 27 to which the cable 22 and the third cable 25 are connected is connected to the negative electrode 21 and the third cable 25 of the adjacent solar cell module (second solar cell module 80B). The first connector 26 is connected by fitting.

  Next, the second connector 27 of the second solar cell module 80B and the first connector 26 of the adjacent solar cell module are fitted and connected. By repeating this sequentially, n solar cell modules are connected in series. In this state, with the first connector 26 of the first solar cell module 80A and the second connector 27 of the nth solar cell module 80N as both ends, the n solar cell modules are connected to the negative electrode 21 and the positive electrode 21, respectively. The cable 22, the first connector 26, and the second connector 27 are connected in series. In this way, a forward path is formed in which a current flows in the direction of arrow A.

  Further, the short-circuit means 40 is connected to the second connector 27 of the n-th solar cell module 80N which is the end of the n solar cell modules 80, and the third connection portion (connection terminal) of the second connector 27 is connected. 22a and the 4th connection part (connection terminal) 24a are electrically short-circuited. As shown in FIG. 6, the short-circuit means 40 electrically connects the fifth connection portion (connection terminal) 41 and the sixth connection portion (connection terminal) 42 in a housing made of an insulating material (for example, resin). One end is connected to the third connector 45 and the fifth connecting portion (connecting terminal) 41, and the other end is connected to the sixth connecting portion (connecting terminal) 42. Are connected to the fourth cable 43.

  The third connector 45 has a structure that can be fitted to the second connector 27, and in the fitted state, the fifth connection portion (connection terminal) 41 of the third connector 45 and the second connector 27. The third connection portion 22a is electrically connected, and the sixth connection portion (connection terminal) 42 of the third connector 45 and the fourth connection portion 24a of the second connector 27 are electrically connected. To do. The fourth cable 43 only needs to have a short length because it only connects the fifth connection portion 41 and the sixth connection portion 42.

  By the short-circuit means 40, the + electrode 17 of the nth solar cell module 80N is connected to the + polar cable 22 of the nth solar cell module 80N, the fourth cable 43, and the third cable 25 of the nth solar cell module 80N. ,..., Via the third cable 25 of the second solar cell module 80B and the third cable 25 of the first solar cell module 80A, the second connection portion (connection) of the first solar cell module 80A Terminal) 23a. In this way, a return path is formed such that a current flows in the direction indicated by arrow B in FIG. 5, and a closed loop is formed together with the forward path.

  That is, the + electrode of n solar cell modules connected in series is connected to the second connection part (connection terminal) 23a of the first solar cell module 80A, and the-electrode of n solar cell modules connected in series is Since it appears in the first connection part (connection terminal) 21a of the first solar cell module 80A, the power generated by the n solar cell modules connected in series is from the first connector 26 of the first solar cell module 80A. It can be taken out. Specifically, an extension cable is connected to the first connector 26 portion of the first solar cell module 80A, the extension cable is wired to the connection box, and taken into the power conditioner via the connection box. If the first solar cell module 80A is arranged on the eave side of the roof and the connection box is installed under the eaves, the length of the extension cable can be minimized.

  As described above, according to the first embodiment of the present invention, for example, in wiring work for connecting solar cell modules installed on a roof in series, the second connectors 27 and the first connectors of the n solar cell modules are connected. The first solar cell module 80A is simply connected to the second connector 27 in order and the short-circuit means 40 is fitted and connected to the second connector 27 of the n-th solar cell module 80N. The generated power can be taken out from the first connector 26. In addition, a solar cell module can be obtained that does not require a trunk cable for wiring and that requires a minimum length for an extension cable to the connection box.

  Note that the -polar cable 21 and the folded cable 23, and the + polar cable 22 and the folded cable 24 of the present embodiment are each integrally molded with a covering material. It may be a double-wire cable made up of two cables.

  A seal member such as an O-ring may be provided between the first connector 26 and the second connector 27 in order to enhance water tightness.

  Further, in this embodiment, each cable is coupled (fitted) by a connector provided at the end, but it is not always necessary to be coupled by the connector, for example, connected by a crimp terminal for connection, They may be connected by being wound from above with an insulating tape or the like.

  The folding cable 23 and the folding cable 24 of the present embodiment are configured by a single third cable 25 without a joint. However, a terminal block is provided in the terminal box 20 and this terminal is provided. The return cable 23 and the return cable 24 may be connected by a stand. In general, when the first double-wire cable 28 and the second double-wire cable 29 are produced from one two-core double-wire cable, it is difficult to divide only one of the one side, but the folded cable 23 and the folded cable 24 are separated. This makes it easy to manufacture.

Embodiment 2. FIG.
FIG. 7 is a diagram illustrating a state in which a terminal box cover of the solar cell module according to Embodiment 2 is opened. FIG. 8 is a diagram of a solar cell module array in which the solar cell modules of Embodiment 2 are connected in series. In the terminal box 30 of the present embodiment, the negative electrode cable (connection cable) 31 and the folded cable 33 are two-core multi-wire cables in which two core wires are integrally molded with a coating material such as resin. One double-line cable 38 is configured. In the present embodiment, the first double-wire cable 38 is longer (about twice as long) as the first double-wire cable 28 of the first embodiment. On the other hand, the second double-wire cable 29 of the first embodiment is omitted, and the second connector 27 is directly fixed to the housing of the terminal box 30. As shown in FIG. 7, the third connection portion (connection terminal) 22 a is formed by extending the lower end portion of the second terminal plate 19. Other configurations are the same as those of the first embodiment.

Also in the solar cell module of the present embodiment, a series-connected closed loop similar to that of the first embodiment can be configured, the same effects as the first embodiment can be obtained, and the number of parts can be reduced. And cost reduction can be achieved. The first connector 26 for you connecting cable and the second connector 27 can be provided with excellent environmental resistance are hidden on the back surface of the solar cell module.

  In the present embodiment, the first double-wire cable 38 is lengthened and the second double-wire cable 29 is omitted from that of the first embodiment. On the other hand, the same effect can be obtained even if the second double-wire cable 29 is lengthened and the first double-wire cable 28 is omitted.

  In addition, although the negative electrode cable 31 and the return cable 33 of this embodiment are integrally molded, the present invention is not limited to this, and may be a double-wire cable including two cables that are independently molded.

  Although not shown, as another example of the present embodiment, the first double-wire cable 38 may be omitted, and the first connector 26 may be directly fixed to the housing of the terminal box 30. If a double-wire cable provided with connectors that can be coupled (fitted) to the first connector 26 and the second connector 27 at both ends is prepared as a separate part, a substantially similar series-connected closed loop is formed. be able to.

  In the said Embodiment 1, 2, all the connection cables which connect a some solar cell module are made into the double track cable. Of course, a large effect can be obtained by making all the lines double, but for example, a certain effect can be obtained even if the lines are doubled only in a specific section. As a minimum configuration, a connection cable spanned between the first solar cell module and the second solar cell module electrically connected in series with the first solar cell module is a connecting cable. The effect of facilitating the connection can be obtained by using a double-wire cable including a folded cable and a folded cable.

  As described above, the solar cell module according to the present invention is useful for a solar cell module that converts light energy, such as the sun, into electrical energy, and in particular, a plurality of the solar cell modules that are arranged side by side on a roof or the like are electrically connected in series. Suitable for solar cell module.

DESCRIPTION OF SYMBOLS 11 Solar cell 12 Front cover material 13 Back surface cover material 14 Solar cell panel 15 Frame member 16- Electrode 17+ Electrode 18 1st terminal board 19 2nd terminal board 20, 30 Terminal box 21- Polar cable (connection cable)
21a 1st connection part (connection terminal)
22 + pole cable (connection cable)
22a Third connection (connection terminal)
23, 24 Folded cable 23a Second connection (connection terminal)
24a Fourth connection part (connection terminal)
25 3rd cable 26 1st connector 27 2nd connector 28 1st double track cable 29 2nd double track cable 31 -Pole cable (connection cable)
33 Folded cable 38 Double-wire cable 40 Short-circuit means 41 Fifth connection (connection terminal)
42 6th connection part 43 4th cable 45 3rd connector 80 Solar cell module

Claims (1)

+ Pole and - a solar cell module having the electrode,
A connection cable in which one end is electrically connected to one of the -pole and the + pole and a first connection portion is provided at the other end;
A third connection provided on the other of the − pole and the + pole;
A first connector that houses the first connection portion and is further provided with a second connection portion;
A second connector that houses the third connection portion and is further provided with a fourth connection portion and is connectable to the first connector;
A folded cable having one end electrically connected to the second connecting portion and the other end electrically connected to the fourth connecting portion;
A terminal box with a housing;
A solar cell module with a cable, comprising:
The connecting cable and the folded cable are integrated with a covering material to constitute a double-wire cable,
The double- wire cable has a length such that the first connector can be fitted to the second connector of the adjacent solar cell module;
The second connector is fixed to the casing of the terminal box,
When the first connector and the second connector of the adjacent solar cell module are coupled, the first connection portion and the third connection portion of the adjacent solar cell module are electrically connected, The solar cell module, wherein the second connection portion and the fourth connection portion of the adjacent solar cell module are electrically connected.

Images