JPH0347335Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The invention relates to a solar cell in which a single or multiple solar cell elements are sandwiched between a transparent cover and an electrically insulating layer made of synthetic resin. The present invention relates to a solar cell module that is constructed by holding a module main body by a frame provided around the module main body and providing terminals for connection to an external electric circuit. Considering the intended use of this type of solar cell module, it is desired that the structure be as simple and as low-cost as possible.

[Prior art and its problems]

In the case of a conventional solar cell module of this kind, for example, a single crystal solar cell module, the fourth
As shown in the figure, a plurality of single crystal solar cell elements 42
are connected in series and parallel in advance by internal connection lead wires 47 as necessary, and an electrically insulating layer 44a made of synthetic resin such as ethylene vinyl acetate is interposed between them and a transparent cover 43 such as glass. Then, the lead wires 46 to the outside, which are arranged substantially parallel to the transparent cover 43 and connected to a specific solar cell element among the plurality of solar cell elements 42, are connected to the series and parallel lines. The solar cell elements 42 and the lead wires 4 are connected to the solar cell elements 42 and the lead wires 4 to be led to the outside through the back side of the solar cell elements 42 connected and arranged in the
A second electrically insulating layer 44b made of synthetic resin such as ethylene vinyl acetate is also formed between the electrically insulating layer 44b and the electrically insulating layer 44b, which is similar to the electrically insulating layer 44b and covers the lead wire 46 from the outside. A layer 44c is provided, and a moisture-proof layer 45 made of a fluorine-based synthetic resin or a fluorine-based resin containing a metal layer as necessary is formed on the outside for moisture-proofing purposes, and the entire layer is sealed by heat compression bonding. After performing this, an appropriate adhesive 4 is applied to the outside of the moisture-proof layer 45.
9 fixes the terminal box 48 containing the connection terminal 56, and connects the lead wire 46 drawn out to the terminal box 48 via the connection terminal 56 provided on the terminal block 50 and the connection wire to the external electric circuit. It is known that a frame body 52 made of aluminum or the like is attached with an appropriate adhesive 53 around a solar cell module main body that can be interconnected with the solar cell module body 51.

In the case of an amorphous silicon type solar cell module as another solar cell module, as shown in FIG.
3 as a board, it can be built directly onto this,
As in the case of the single-crystal solar cell module 41, internal connection lead wires between individual solar cell elements and an electrical insulating layer between the transparent cover 63 serving as a substrate and the solar cell element 62 are not required. but,
From one end of the solar cell 62 to the solar cell element 6
An electric insulating layer 64b made of a synthetic resin such as ethylene vinyl acetate between the lead wire 66 and the solar cell element 62, which is led to the outside through the back side of the lead wire 64, and the outside of the lead wire 66 It is necessary to form an electrically insulating layer 64c for covering and a moisture-proof layer 65 made of a fluorine-based synthetic resin or a fluorine-based synthetic resin containing a metal layer if necessary, which is applied on the outside thereof, and these are all bonded by heat and pressure. After performing the sealing process, the moisture-proof layer 65
The terminal box 68 is fixed to the outside of the terminal box 68 with an appropriate adhesive 69, and the lead wire 66 that has been guided to the terminal box 68 is connected to the connecting terminal 76 of the terminal block 70 provided inside the terminal box 68. The monocrystalline solar cell module is constructed by attaching a frame 72 made of aluminum or the like with an appropriate adhesive 73 around the main body of the solar cell module, which can be connected to a connecting wire 71 to an external electric circuit through the main body. This is similar to the case of No. 41.

In each of the solar cell modules 41 or 61 shown in FIG. 4 or 5, as described above, from the solar cell element 42 or 62 inside the respective solar cell module main body, When leading the lead wire 46 or 66 to the terminal box 48 or 68 fixed to the terminal box 48 or 68, an electrical insulating layer 44b or 64b is placed between each solar cell element 42 or 62 and the lead wire 46 or 66. , and then, before performing the sealing process by heat compression bonding, a lead wire extraction hole 5 is formed that penetrates the electrical insulating layer 44c or 64c located outside and the moisture-proof layer 45 or 65.
4 or 74, and draw out the lead wire 46 or 66 through the hole 54 or 74, and then perform the sealing treatment by heat compression bonding,
Furthermore, in order to prevent moisture from entering the interior through the extraction hole 54 or 74, the extraction hole 54 is filled with a filler material 55 or 75 such as silicone rubber.
Alternatively, a complicated work is required, such as having to fill the space between the lead wire 74 and the lead wire 46 or 66.

Moreover, in the module 61 made of the amorphous silicon type solar cell elements 62 which have a particularly low reverse bias resistance capacity, the solar cell elements 62 built into the transparent cover 63 are already connected in series and parallel at that point. However, due to the uneven irradiation of sunlight during the operation of the solar cell module 61, the solar cell elements 62 are affected by the reverse bypass effect of the diode characteristics that acts between the solar cell elements 62 connected in series and parallel. In order to prevent damage to the solar cell elements 62, a bypass diode for biasing reverse current due to a reverse bias effect is connected in parallel to the solar cell elements 62 connected in series and parallel. At that time, normally, as shown in FIG. 6, inside the terminal box 68, the lead wire 66 is connected to one of the connection terminals 76, and a plurality of bypass diodes 77, 78 are connected to the other side along with the connection wire 71 of the external electric circuit. so that it is connected. As a result, the terminal box 68 in this case inevitably becomes large.

As explained above, in conventional solar cell modules, whether the single crystal type 41 or the amorphous silicon type 61, the connection terminal 56 is fixed to the outside of the module body from the solar cell element 42 or 62 inside the module body. Or 76
In addition, it is necessary to provide a plurality of electrically insulating layers 44b, 44c or 64b, 64c to guide the lead wire 46 or 66 to the connecting terminal 5.
At 6 or 76, the connecting wire 5 of the external electric circuit
The lead wire 4 is connected to the electrically insulating layer 44c or 64e and the moisture-proof layer 45 or 65 on the outside thereof.
6 or 66, and after pulling out the lead wire 46 or 66, insert an appropriate insulating plug between the lead wire 46 or 66 and the hole 54 or 74. material such as silicone rubber 55 or 75
This requires the troublesome work of having to fill in the gaps. Furthermore, since bypass diodes 77 and 78 for protecting the amorphous silicon solar cell element 62 must also be housed in the amorphous silicon solar cell module 61, the terminal box 68 has to be relatively large. I have no choice but to. From these points, the conventional solar cell module 41 or 61 cannot avoid the disadvantages that it has a large number of component parts, is complicated in construction, and has many factors that increase manufacturing costs.

[Purpose of invention]

In view of the above-mentioned drawbacks of conventional solar cell modules, it is an object of the present invention to provide a solar cell module that is simple in construction, requires less labor, and is generally low in cost.

[Key points of the idea]

In order to achieve the above object, the present invention provides the solar cell module described above, in which a lead wire is built into the insulator, one end of which is connected to the solar cell element, and the other end of which is connected to an external electric circuit. The connection terminal is fixed to one end of the translucent cover, and is held together with the solar cell element by the translucent cover and the electrically insulating layer made of the synthetic resin, and is connected to the frame and the electrically insulating layer. By configuring the lead wire to be led out from between the layers, the lead wire can be connected to an external electric circuit directly through the inside of the connection terminal without guiding the back side of the solar cell element. It is something that is done like this.

[Example of idea]

Next, the present invention will be explained in detail based on the embodiments shown in the drawings.

In the monocrystalline solar cell module 1 shown in FIG. 1, a plurality of solar cell elements 2 are connected in series and parallel in advance by internal connection lead wires 7, as required, and then covered with a transparent cover such as glass. The solar cell elements 2 and 3 are arranged substantially parallel to the transparent cover 3 with an electrical insulating layer 4a made of synthetic resin such as ethylene vinyl acetate interposed therebetween, and the solar cell elements 2 and 3 are connected in series and parallel. In the same line, a lead wire 9 is connected to one end of the translucent cover 3 to the outside.
A connecting terminal 8 containing a built-in is fixed with an adhesive 10, and the other end of the lead wire 9, one end of which is connected to an external electric circuit, is connected to a specific one of the solar cell elements 2. Connect to the connection lead wire 6 provided on the element. After that, the solar cell element 2
An electric insulating layer 4c made of a synthetic resin such as ethylene vinyl acetate is applied to cover the entirety and a part of the connection terminal 8, and on the outside thereof, a fluorine-based synthetic resin for moisture proofing or as required. A moisture-proof layer 5 made of a fluorine-based resin containing a metal layer is formed, and the whole is sealed by heat and pressure bonding.A suitable adhesive 12 is applied to the periphery of the main body of the solar cell module made of aluminum or the like. The construction of the single-crystal solar cell module 1 by bonding the frame 11 is the same as in the case of conventional solar cell modules.

On the other hand, in the amorphous silicon type solar cell module 21 shown in FIG. At one end of the translucent cover 23 in the same line as 22, apply an appropriate adhesive 30 (in this case, it is preferable to use an ultraviolet curable adhesive that can be bonded in a particularly short time).
One end of the connection terminal 28 is adhesively fixed to the external electric circuit, and the other end is connected to the solar cell element 22 via the connection lead wire 26.
In addition to incorporating a lead wire 29 to be connected to the amorphous silicon type solar cell element 22, a third As shown in FIG. 3, the single crystal solar cell module 1 shown in FIG. 1 also includes bypass diodes 33 and 34 connected in parallel to the solar cell elements 22 connected in series and parallel. The only difference from the above case is that an electric insulating layer 24c made of a synthetic resin such as ethylene vinyl acetate is applied to cover the solar electronic element 22 and a part of the connection terminal 28, and a moisture-proof layer is further applied to the outside thereof. A moisture-proof layer 25 made of the desired fluorine-based synthetic resin or a fluorine-based resin containing a metal layer if necessary is formed, and the whole is sealed by heat and pressure bonding to form the main body of the solar cell module. As in the case of the single crystal solar cell module 1, the amorphous silicon solar cell module 21 is constructed by adhering a frame 31 made of aluminum or the like around the periphery with an appropriate adhesive 32.

By configuring the monocrystalline solar cell module 1 or the amorphous silicon solar cell module 21 as described above based on the present invention, it can be connected to the solar cell element 2 or 22 for connection to an external electric circuit. Connect the lead wire 9 or 29 to the solar cell element 2 or 2.
This is because the solar cell module 1 or 21 can be guided and drawn out directly through the inside of the connection terminal 8 or 28 fixed to one end of the transparent cover 3 or 23 to the external electrical circuit of the solar cell module 1 or 21 without having to route the back side of the solar cell module 2. , there is no need to provide an electrical insulating layer for insulating between the solar cell element 2 or 22 and the lead wire 9 or 29, and there is no need to provide an electrical insulating layer for insulating between the solar cell element 2 or 22 and the lead wire 9 or 29; Electrical insulation layer 4c or 2
4c and the moisture-proof layer 5 or 25, and there is no need to fill the space between the extraction hole and the extraction lead wire 9 or 29 with an appropriate filling material. By fixing the terminal 8 or 28 to the end of a translucent cover that does not contribute much to the power generation capacity of the solar cell module with a simple configuration, etc.
It is possible to reduce the size and cost of the solar cell module without almost encroaching on the effective power generation area.

[Effect of idea]

As explained above, the present invention includes a solar cell module body in which a single or multiple solar cell elements are sandwiched between a transparent cover and an electrically insulating layer made of synthetic resin, and a solar cell module body is provided around the solar cell module body. In a solar cell module configured by being held by a frame body and provided with a terminal for connection to an external electric circuit, one end of the module is connected to the solar cell element and the other end is connected to the external electric circuit. The connection terminal, which is built in an insulator, is fixed to one end of the translucent cover, and is sandwiched together with the solar cell element by the translucent cover and the electrical insulating layer, and is connected to the frame and the electrically insulating layer. By configuring the lead wire to be led out from between the electrical insulating layer and the external electric circuit, the connection can be made without having to route the lead wire for connecting the solar cell element and an external electric circuit around the back side of the solar cell element. Since the solar cell element can be directly drawn out to the outside via the terminal, there is no need to provide an electrical insulation layer between the solar cell element and the lead wire, and the lead wire can be drawn out directly from the solar cell module main body. In order to draw out from the inside to the outside, a lead-out hole may be made in the electrical insulation layer and moisture-proof layer of the solar cell module main body, and an appropriate filler may be provided to fill the gap between the lead-out hole and the lead wire for drawing out. In addition, since the connection terminals are fixed to the ends that hardly contribute to the power generation capacity of the solar cell module, the power generation capacity is hardly affected, and the solar cell can be made smaller and simpler. This has the effect of reducing costs.

[Brief explanation of the drawing]

1 and 2 are schematic vertical cross-sectional views of the main parts of a single crystal solar cell module and an amorphous silicon solar cell module related to the present invention, respectively, and FIG. FIGS. 4 and 5 are schematic cross-sectional views of the connection terminals showing the arrangement of bypass diodes in the connection terminals of the battery module, respectively. Further, FIG. 6 shows a schematic configuration diagram showing the arrangement of bypass diodes inside the connection terminal box of a conventional amorphous silicon solar cell module. 1, 21... Solar cell module, 2, 22...
...Solar cell element, 3, 23...Translucent cover, 4
a, 4c, 24... Electrical insulating layer, 8, 28... Connection terminal, 9, 29... Output lead wire, 11,
31...Frame body.

Claims (1)

[Scope of utility model registration request] A solar cell module main body, in which a single or multiple solar cell elements are sandwiched between a transparent cover and an electrically insulating layer made of synthetic resin, is held by a frame provided around the main body, and an external In a solar cell module configured with a terminal for connection to an electric circuit, the connecting lead wire is built in an insulator, one end of which is connected to the solar cell element, and the other end of which is connected to an external electric circuit. A terminal is fixed to one end of the translucent cover, and is sandwiched together with the solar cell element by the translucent cover and the electrically insulating layer, and is connected to the outside from between the frame and the electrically insulating layer. A solar cell module characterized in that it is configured to be derived from the solar cell module.