Solar-cell module

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a solar cell module having a plurality of solar cells electrically connected in series or series-parallel, and more particularly to a solar cell module having a bypass diode that bypasses the output current of the solar cells.

【0002】

[Conventional technology]

The conventional solar cell module is shown in FIGS. 10 and 11. In FIGS. 10 and 11, 1 is a solar cell module, 2 is a translucent panel, 3 is a backsheet, 4 is a solar cell, and 5 is a translucent adhesive. A plurality of solar cells 4 are connected in series or series-parallel and arranged in a matrix consisting of rows and columns. A plurality of solar cells 4 are fixed with ethylene vinyl acetate (EVA) resin as a translucent adhesive 5, and the front surface side thereof is covered with a translucent panel 2 made of glass or the like, and the back surface side has weather resistance. It is configured by providing a back sheet 3.

【0003】

Then, as shown in FIG. 12, a plurality of solar cell groups 6 (6a, 6b, 6c) are formed by the solar cell 2 connected in series or series-parallel, and these plurality of solar cell groups 6a, 6b, 6c are combined. In addition to connecting in series, in order to take out the electrical output of the solar cell group 6, the output is taken out from the solar cell groups 6a and 6c at both ends. Therefore, the solar cell groups 6a and 6c at both ends are connected to the terminal box 8. Further, a plurality of solar cell protection bypass diodes 7 are connected in parallel to each solar cell group 6, and the bypass diodes 7 installed in the terminal box 8 are connected to the bypass diode 7 installed in the terminal box 8 from one end of the solar cell module 1. They are connected in parallel.

【0004】

The bypass diode 7 is provided to protect the solar cell 2 from damage or the like. That is, when a part of the solar cell 2 in the solar cell group 6 is in the shadow, the output is lowered and the solar cell 2 is subjected to the reverse bias, and the cell 2 is overheated to cause the solar cell 2 to be overheated. It releases the reverse bias of the solar cell 2 and protects the solar cell 2 from damage due to the reverse bias because it may cause damage or cause a fire.

【0005】

[Problems to be Solved by the Invention]

However, the amount of heat generated when a reverse bias is applied to the solar cells greatly affects the number of solar cells 2 in series in the solar cell group 6, and the number of solar cells 2 in one solar cell group 6 is large. Is limited by the amount of heat generated. Therefore, there is a problem that the size of the solar cell module is limited by the number of solar cell 2 to which the bypass diode 7 must be connected. That is, in the conventional solar cell module, since the bypass diode 7 is connected from one end of the solar cell module, the solar cell module 1 reciprocates once in the column direction or the row direction of the solar cell 2. It could only be as large as the number of units that could be connected in series. Generally, the number of cells that can be taken by the solar cell groups 6a, 6b, and 6c is about 5 to 30.

【0006】

The present invention has been made in view of such problems, and a solar cell having a highly flexible matrix arrangement in which the size of the solar cell module is not limited by the number of solar cells in one solar cell group. The purpose is to provide a module.

【0007】

[Means for solving problems]

In order to achieve the above object, in the solar cell module according to the present invention, a plurality of solar cells are arranged in a matrix consisting of rows and columns on the back surface side of the translucent panel, and the plurality of solar cells are arranged in a matrix. A plurality of solar cell groups connected in series or in parallel are formed for each, and the plurality of solar cell groups are connected in series and housed in a terminal box formed on the back surface side of the solar cell in each solar cell group. In the solar cell module in which the bypass diodes are connected in parallel, the solar cell of any of the above solar cell groups is arranged on an extension of the row of the solar cell of the other solar cell group, and the solar cell group Is connected to a bypass diode in the terminal box via the back surface side of another solar cell group.

【0008】

In the solar cell module, the solar cell group may be arranged so as to extend over a row of solar cell cells of a plurality of other solar cell groups.

【0009】

Further, in the solar cell module, an insulating film is arranged on the back surface side of the other solar cell group, and any of the solar cell groups and the bypass diode are connected via the back surface side of the insulating film. Is desirable.

【0010】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the solar cell module according to the present invention will be described. FIG. 1 is a view showing one embodiment of the solar cell module according to the present invention, and FIG. 2 is a view of the solar cell module also viewed from the back side. In the solar cell module according to the present invention, the sealing structure of the solar cell is the same as that of the conventional solar cell module shown in FIG. That is, the solar cell module 1 has a translucent panel 2 made of an insulating transparent material such as glass, a back sheet 3 having a three-layer structure in which PET or the like is sandwiched between resin films (for example, PVF (polyvinyl fluoride)), and between them. , A plurality of solar cells 4 arranged in a matrix consisting of rows and columns, and as a sealing material, a translucent panel 2 and a solar cell 4, a solar cell 4 and a back sheet 3. It is equipped with a translucent adhesive 5 such as EVA that is filled between each of the above, fixes and seals the mutual positional relationship, and the outer periphery of the translucent panel 2 and the backsheet 3 is made of Al or the like. A frame 6 is attached. As shown in FIG. 3, on the back surface side of the solar cell module 1, a terminal box 8 for deriving the output from the solar cell 4 is provided inside the outer peripheral portion of the back sheet 3. And the output lines 10a and 10b of the positive and negative electrodes are derived from this terminal box 8.

【0011】

Fig. 3 shows the equivalent circuit of the solar cell module shown in Fig. 1. A plurality of solar cells 4 are arranged in a matrix consisting of rows and columns, and a plurality of solar cell groups 6 (6a, 6b, 6c) connected in series or in parallel to each of the plurality of solar cells 4 are formed. There is. The solar cell 4 of the second solar cell group 6b is arranged on an extension of the row of the solar cell group 4 of the first solar cell group 6a and the second solar cell group 6c, and the solar cell group 6a, The solar cells 4 of the second solar cell group 6b are arranged across the extension of the row of the solar cells 4 of 6c.

【0012】

Multiple solar cell groups 6a, 6b, 6c are connected in series. That is, one end of the first solar cell group 6a is connected to one terminal 12a in the terminal box 8, the first solar cell group 6a and the second solar cell group 6b are connected by wiring 14a, and the second The solar cell group 6b and the third solar cell group 6c are connected by wiring 14b, and the other end of the third solar cell group is connected to the other terminal 12b in the terminal box 8.

【0013】

Further, the wiring 15a is connected by branching from the wiring 14a, and the wiring 15b is connected by branching from the wiring 14b. The wirings 15a and 15b are connected between the bypass diodes 11 in their terminal boxes 7. Therefore, the bypass diode 11 is connected in parallel to each of the solar cell groups 6a, 6b, and 6c.

【0014】

The wirings 15a and 15b for connecting the second solar cell group 6b to the bypass diode 11 pass through the other solar cell groups, that is, the back side of the first solar cell group 6a and the second solar cell group 6b. It is connected to the bypass diode 11 in the terminal box 7.

【0015】

6 is a sectional view taken along line BB in FIG. 1, FIG. 7 is a sectional view taken along line CC in FIG. 1, and FIG. 8 is a sectional view taken along line DD in FIG. As shown in FIG. 8, first, the wiring 15a connected to the solar cell 4 in the second solar cell group 6b is pulled out laterally so as to be located on the insulating film 16. Next, as shown in FIG. 7, the wirings 15a and 15b are pulled upward through the insulating film 17 arranged on the back surface side of the solar cell 4 belonging to the other solar cell groups 6a and 6c, and the solar cell module Connect to the terminal of the bypass diode 11 in the terminal box 7 provided on the back side of the.

【0016】

FIG. 6 is a diagram showing the inside of the terminal box 7. Three bypass diodes 11 (11a, 11b, 11c) are provided in the terminal box 7, and wiring 14a connected to the second solar cell group 6b between the anode terminal and the cathode terminal of the second diode 11b. , 14b are connected. The wiring 13a connected to the first solar cell group 6a is connected to the cathode side of the first bypass diode 11a, and the wiring 13b connected to the third solar cell group 6c is the anode side of the third bypass diode 11c. It is connected to the.

【0017】

That is, the wiring 14a that divides the first solar cell group 6a and the second solar cell group 6b into blocks is between the first column and the second column solar cell back electrode 15 in the 12th row on the matrix of FIG. , Connected parallel to the row direction. This wiring 14a is connected to the cathode side of the diode 11a of the terminal box 7 shown in FIG. 4 and the terminal 10b on the anode side of the diode 11b. In addition, the wiring 14b that divides the 2nd solar cell group 6b and the 3rd solar cell group 6c into blocks is in the row direction between the 3rd column of the 13th row and the back electrode 15 of the solar cell in the 4th row on the matrix. Connected in parallel to (see Figure 4).

【0018】

This wiring 14b is connected to the terminal 10c which is the cathode side of the diode 11b of the terminal box 7 of FIG. 6 and the anode side of the diode 11c. Further, as shown in FIG. 5, since the internal wirings 14a and 14b pass through the back side of the solar cell 4, the insulating member 16 has a structure for preventing an electrical short circuit.

【0019】

[Effect of the invention]

As described above, according to the solar cell module according to the present invention, the solar cell of any of the solar cell groups is arranged on the extension line of the row of the solar cell of the other solar cell group, and this Since the solar cell group is connected to the bypass diode in the terminal box via the back side of the other solar cell group, the arrangement of the matrix is limited by the number of solar cells connected in parallel to the bypass diode. It will be possible to arrange them freely without any problems, and the size and shape of the solar cell mogul can be freely designed.

[Simple explanation of drawings]

[Figure 1]

It is a figure which shows the solar cell module which concerns on this invention.

[Figure 2]

It is a figure which shows the back side of the solar cell module which concerns on this invention.

[Fig. 3]

It is a figure which shows the equivalent circuit of the solar cell module of FIG.

[Fig. 4]

It is the AA line sectional view of FIG.

[Fig. 5]

It is the BB line sectional view of FIG.

[Fig. 6]

It is a figure which shows the terminal box part of the solar cell module which concerns on this invention.

[Fig. 7]

It is a figure which shows the conventional solar cell module.

[Fig. 8]

It is a cross-sectional view of AA line in FIG.

[Fig. 9]

It is a figure which shows the equivalent circuit of the conventional solar cell module.