JP3349317B2 - Solar cell module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module having a diode for suppressing a decrease in output.

[0002]

2. Description of the Related Art In recent years, solar cell modules have become widespread, and the demand for solar cell modules for medium-scale systems installed outdoors, such as private houses, has been rapidly increasing.

In general, when a solar cell module is used for electric power, a plurality of modules are connected in series to form a block of 200 V or more, and the blocks are connected in parallel to form a solar cell array.

Next, such a module will be described with reference to FIG. 6 which shows a circuit diagram. Reference numeral 1 denotes a solar cell module, and 2 denotes a bypass diode connected in parallel to the module 1. When an abnormality occurs in the module 1 due to a failure or a shadow, the output of a block composed of a plurality of modules 1 is reduced. I am holding it down.

Normally, a current flows through a plurality of modules 1 connected in series as indicated by a solid arrow in FIG. 6, but when an abnormality occurs, for example, when the upper module 1 in the figure fails, the lower The current from the module 1 on the side does not pass through the module 1 on the upper side, but flows through the bypass diode 2 to the module 1 in the next stage, thereby suppressing a decrease in the output of the block.

Although the above description is directed to the case where the bypass diode 2 is connected to the module 1 in parallel, the same applies to the case where the bypass diode 2 is connected to the solar cell in parallel.

[0007]

In the case of the conventional solar cell module, when an abnormality occurs due to a failure, it is necessary to externally visually identify which module 1 in the block has failed in order to cope with the repair. Is difficult.

The present invention has been made in consideration of the above points, and when an abnormality occurs due to a failure, which module in the block has failed can be easily visually identified from the outside, and the solar cell can be easily repaired. The purpose is to provide a module.

[0009]

In order to solve the above problems, a solar cell module according to the present invention comprises a front glass and a rear glass.
One or more solar cells are connected in series between the film and embedded in the sealant, and one or more cells connected in parallel with one or more cells in the sealant are included. In a solar cell module having a plurality of diodes, sealing
The nichrome wire connected in series with the diode
Discolored above 100 ° C placed close to the nichrome wire
Those having a color change body.

[0010]

Means for Solving the Problems] Therefore, when an abnormality occurs due to a failure, it is possible to confirm visually the discoloration of varying color bodies from the outside can of either easily identify which module in the block has failed, easy repair Can respond.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference Example A reference example will be described with reference to FIGS. First, FIG. 1 showing a circuit diagram differs from FIG.
A light emitting body 3 composed of a light emitting diode is connected in series to a bypass diode 2, and this series circuit is connected to the solar cell module 1
In parallel.

Next, the module 1 of FIG. 1 will be described with reference to FIGS. 2A and 2B which are a plan view and a cutaway front view. In the figure, 4 is a surface glass and 5 is a surface glass 4.
A sealing agent made of ethylene vinyl acetate integrally formed on the lower surface of the solar cell; 6 is a plurality of solar cells embedded in the sealing agent 5 and connected in series by tabs (not shown); A light emitter 3 connected in series to the bypass diode 2 is embedded to the right of 6. Reference numeral 7 denotes a back surface film bonded to the lower surface of the sealant 5, which converts light energy of sunlight incident on the cell 6 through the front glass 4 and the sealant 5 into electric energy.

The connection between the bypass diode 2 and the light emitting body 3 is made at the time of manufacturing the module.

Then, as shown in FIG. 3, a plurality of solar cell modules 1 are installed on the roof 9 of the house 8, and when an abnormality occurs due to a failure, the luminous body 3 and the bypass diode of the module 1 in which the abnormality has occurred. When a current flows through the module 2, the light emission of the light emitting body 3 can be visually observed from the outside, and the module 1 in which an abnormality has occurred can be specified.

(Embodiment 1 ) Next, Embodiment 1 will be described with reference to FIG. 4 showing a circuit diagram and FIGS. 5A and 5B showing a plan view and a cutaway front view of the solar cell module 1 of FIG. In these figures, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding elements, and the differences are as follows.

Reference numeral 10 denotes a nichrome wire connected in series to the bypass diode 2. The nichrome wire has a length of, for example, 120 ° C. at a current of 3 A flowing through the diode 2, and is embedded in the sealant 5. Reference numeral 11 denotes a discolored body made of a heat seal that discolors at a temperature of 100 ° C. or higher, and is buried close to a position above the nichrome wire 10 of the sealant 5. In addition, the solar cell module is 70-
Since the color changing body 11 may be overheated to 80 ° C., it is preferable that the color changing body 11 changes color at 100 ° C. or more as described above. Further, the length of the nichrome wire 10 may be appropriately adjusted according to the temperature at which the color of the color-changing body 11 changes.

When an abnormality occurs due to a failure,
An electric current flows through the nichrome wire 10 and the bypass diode 2 of the module 1 in which the abnormality has occurred, and the nichrome wire 10
C., and the discolored body 11 changes color, as in the first embodiment.
An abnormal module 1 can be specified.

Further, the was used heat-sealed to varying chromosome 11 in the form 1, is not limited thereto, as long as the discoloration Ri by the current flowing through the bypass diode 2.

[0019]

Since the present invention is configured as described above, it has the following effects. The solar cell module 1 of the present invention, by a current flowing through the diode 2 connected in parallel to the solar cell 6, due to the provision of a variable color bodies 11 you discoloration, when an abnormality occurs due to a failure, varying color bodies 11
Can be visually checked from the outside, which module 1 in the block has failed can be easily specified, and repair can be easily performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a reference example of the present invention.

2A is a plan view of the solar cell module of FIG. 1, and FIG. 2B is a cut-away front view of FIG. 2A.

FIG. 3 is a perspective view of the installation state of FIG. 2;

4 is a circuit diagram of a form status of the present invention.

5A is a plan view of the solar cell module of FIG. 4, and FIG. 5B is a cut-away front view of FIG. 5A.

FIG. 6 is a circuit diagram of a conventional example.

[Description of Signs] 1 solar cell module 2 diode 3 illuminant 6 solar cell 11 color changing body

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01L 31/04-31/078 H02J 7/34-7/36

Claims (1)

(57) [Claims] 1. One or more solar cells are connected in series between a front glass and a back film and embedded in a sealant.
And a solar cell module having one or more diodes connected in parallel with one or more cells in the sealant , wherein the solar cell module is connected in series with the diodes in the sealant. Done nik
Rom wire and 100 placed close to the nichrome wire.
A solar cell module with a discolored body that discolors above ℃ .