JP4004203B2 - Solar cell module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solar cell module.
[0002]
[Prior art]
In a conventional solar cell module, a plurality of solar cells constitute a plurality of solar cell groups, a plurality of solar cell groups are connected in series with adjacent solar cell groups, and a structure for electrical output from the solar cell groups at both ends, This is disclosed in JP-A-10-256584.
[0003]
Each solar cell group includes a plurality of solar cell protection bypass diodes that are electrically connected in parallel.
[0004]
Thus, in order to output from the solar cell group at both ends and to connect the bypass diode in parallel for each solar cell group, the part connected in series between the adjacent solar cell groups and the output unit from the solar cell group at both ends And a wiring for electrically connecting the plurality of bypass diodes.
[0005]
[Problems to be solved by the invention]
As shown in FIGS. 4 and 5 of the above publication, such wirings have to be arranged one by one at a long distance and soldered by one. For this reason, there existed a problem that workability | operativity was bad or position shift occurred in wiring during work.
[0006]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a structure in which the workability of electrical wiring is good and the positional displacement of the wiring hardly occurs.
[0007]
[Means for Solving the Problems]
Main configuration of a solar cell module of the present invention, the surface member, and back member, and a plurality of solar cells arranged in a matrix between the front member and back member, and the solar cell and the surface member A light-receiving side sealing resin disposed between, a back-side sealing resin disposed between the solar cell and the back surface member, and a plurality of bypass diodes disposed on the back surface side of the back surface member A solar cell module comprising a terminal box, wherein the plurality of solar cells include a plurality of solar cell groups including at least one column of solar cells arranged in electrical connection in a row direction. Parallel wiring for output derivation that is electrically connected to the solar cell groups at both ends of the battery group, parallel wiring for electrically connecting the adjacent solar cell groups in series, and these parallel wirings And the terminal A wiring unit body that electrically connects the plurality of bypass diodes arranged inside the wiring, the wiring unit body covering the plurality of wirings that electrically connect the parallel wiring and the plurality of bypass diodes with an insulating film In addition, there is a cutout between each wiring, and a sealing resin is disposed between the wiring unit body and the solar cell located below the wiring unit body, and on the back side of the wiring unit body. The back side sealing resin is disposed and sealed .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 are completed views of the solar cell module 1 according to the present embodiment.
[0009]
The solar cell module 1 includes a surface member 2 made of an insulating transparent material such as glass, a back surface member 3 having a three-layer structure in which a metal foil such as Al is sandwiched between resin films (for example, PVF (polyvinyl phthalate)), and the like. A plurality of solar cells 4... Arranged in a matrix having rows and columns are provided therebetween. And as sealing material, it fills between the surface member 2 and the solar cell 4 and between the solar cell 4 and the back surface member 3, respectively, and fixes the mutual positional relationship and seals transparent sealing resin 5 such as EVA. It has.
[0010]
An outer frame 6 made of aluminum or the like is attached to the outer periphery of the front surface member 2 and the back surface member 3. The outer frame 6 has a hollow main body portion 6a and a U-shaped fitting portion 6b which is located at the upper portion of the main body portion 6a and fits the outer peripheral portions of the front surface member 2 and the back surface member 3 through the sealing material 7. And an outer peripheral groove 6c located outside the main body portion 6a. The outer peripheral groove 6c is a groove through which rainwater flows when the solar cell module 1 is installed outdoors.
[0011]
Further, as shown in FIG. 3, on the back surface side of the solar cell module 1, a terminal box 8 for deriving an output from the solar cell 4 is provided inside the outer peripheral portion of the back surface member 3. From this terminal box 8, positive and negative output lines 9 and 9 are led out.
[0012]
Below, the structure is demonstrated, explaining the intermediate body in the middle of manufacture of the said completed solar cell module 1 one by one.
[0013]
FIGS. 4 and 5 are views showing the solar cell module intermediate body 11 in the middle of the first production of the present embodiment, as seen from the back side of the completed solar cell module.
[0014]
This intermediate body 11 has a sheet-shaped light-receiving side sealing resin 5a before pressing and vacuum heating disposed on the surface member 1, and a solar cell 4 is disposed thereon (back surface side). ing.
[0015]
In the figure, the solar cells 4... Are displayed from 1 to 12 rows (intermediate rows are omitted in the drawing) and 1 column so as to be indicated by reference numerals outside the solar cell module intermediate body 11. It is configured in an 8-row matrix.
[0016]
As each solar cell 4, a substantially rectangular plate-like silicon single crystal or polycrystalline solar cell can be used. The plurality of solar cells 4... Are composed of a first solar cell group 12a, a second solar cell group 12b, a third solar cell group 12c, and a fourth solar cell group 12d each composed of two rows. Yes.
[0017]
In each solar cell group 12, each solar cell 4 is electrically connected in series. Specifically, each solar cell group 12 is connected in series in the order of rows in each column, and the 12 rows of solar cells that are the bottom row of each solar cell group 12. The batteries 4 are connected in series with the 12 solar cells 4 in the lowermost row adjacent to the same solar cell group 4.
[0018]
Each solar cell group 12 is connected in series with the adjacent solar cell group 12 on the outer peripheral side of the first row as one end.
[0019]
The leftmost first solar cell group 12a is electrically output from the first row and first column solar cells 4 connected in series at the extreme end, and the rightmost fourth solar cell group 12d is connected in series at the extreme end. The output can be obtained from the solar cell module by performing electrical output from the solar cells 4 in the first row and the eighth column. In the following description, the solar cell 4 in the Xth row and the Yth column is represented as a solar cell 4 (X, Y).
[0020]
Next, in the terminal box 8, for each solar cell group 12, electric wiring for connecting the solar cell protecting bypass diode in parallel with each solar cell group 12 will be described.
[0021]
This electrical wiring is connected in series between the parallel wirings 13a and 13d from the output portions of the first solar cell group 12a and the fourth solar cell group 12d at both ends, and the adjacent solar cell groups 4, and from this serially connected portion. The extended parallel wirings 13ab, 13bc, and 13cd are included. In addition, internal wirings 14 a, 14 ab, 14 bc, 14 cd, and 14 d that are orthogonally soldered to the ends of the parallel wirings 13 and go to the terminal box 8 are provided. And these internal wiring 14 is comprised from the wiring unit body 16 which has the insulating member 15 which connects each internal wiring 14 previously.
[0022]
Specifically, each parallel wiring 13 is obtained by solder plating a metal foil such as copper, and the parallel wiring 13a is connected in series at the outermost end of the first solar cell group 12a and outputs solar cells 4 (1, 1). Are connected to the tab electrodes 17, 17 made of metal foil extending from the solder, and arranged in parallel in the row direction on the outer peripheral portion on the surface member 2.
[0023]
The parallel wiring 13ab was connected in series at one end in the tab electrodes 17, 17 and the second electrode battery group 12b extending from the solar cells 4 (1, 2) connected in series at the other end of the first solar cell group 12a. The tab electrodes 17, 17 extending from the solar cell 3 (1, 3) are solder-connected on a straight line, and are arranged in parallel in the row direction on the outer peripheral portion on the surface member 2.
[0024]
The parallel wiring 13bc was connected in series at one end in the tab electrodes 17 and 17 and the third solar cell group 12c extending from the solar cell 4 (1, 4) connected in series at the other end of the second solar cell group 12b. The tab electrodes 17, 17 extending from the solar cell 4 (1, 5) are solder-connected on a straight line, and are arranged in parallel in the row direction on the outer peripheral portion on the surface member 2.
[0025]
The parallel wiring 13cd was connected in series at one end in the tab electrodes 17, 17 extending from the solar cell 4 (1, 6) connected in series at the other end of the third solar cell group 12c and the fourth solar cell group 12d. The tab electrodes 17, 17 extending from the solar cell 4 (1, 7) are solder-connected on a straight line, and are arranged in parallel in the row direction on the outer peripheral portion on the surface member 2.
[0026]
The parallel wiring 13d is solder-connected to the tab electrodes 17 and 17 made of metal foil extending from the solar cell 4 (1, 8) connected in series and output at the outermost end of the fourth solar cell group 12d. The upper outer peripheral portion is arranged in parallel to the row direction.
[0027]
As shown in the figure, in the parallel wiring 13, the parallel wirings 13a and 13b are arranged on the outer peripheral side from the parallel wirings 13ac and 13cd, and the parallel wirings 13ac and 13cd are arranged on the outer peripheral side from the parallel wiring 13bc. Since the parallel wirings 13 do not cross each other, it is not necessary to perform insulation processing at the crossing portions.
[0028]
FIG. 5 is an enlarged view of the vicinity of the wiring unit body 16 in FIG. In the wiring unit body 16, each internal wiring 14 is obtained by solder plating a metal foil such as copper. The insulating member 15 (indicated by hatching in the rear view of FIG. 5A) is made of an insulating film such as PET resin, and sandwiches both surfaces of each internal wiring 14 with an acrylic adhesive (not shown). At the same time, it has connecting portions 15x and 15y, and the internal wirings 14 are connected by the connecting portions 15x and 15y. And the extraction part 15s ... is formed between the connection parts 15x and 15y. Then, the sealing resin 5 is disposed in these punched portions 15s when completed by vacuum heating. Peeling is likely to occur at the interface between the sealing resin 5 and the insulating member 15 such as PET with long-term use. However, by providing the cutout portion 15s, the interface between the transparent resin 5 and the insulating member 15 is easily peeled off. The area is reduced to reduce peeling, and the progress of the peeling can be stopped by the sealing resin 5 disposed in the punched portion 15.
[0029]
As described above, in this embodiment, each internal wiring 14 is composed of the wiring unit body 16 having the insulating member 15 that connects the internal wirings 14 in advance, so that one end of each internal wiring 14 is connected to each parallel wiring 14. When soldering to the end of the wiring 13, the operation is easy and the internal wirings 14 are not displaced from each other.
[0030]
Then, the solar cell module intermediate body 21 in the second manufacturing process shown in FIG. 6 is created. As shown in the figure, between the wiring unit body 16 and the solar cell 4 positioned therebelow, a rectangular sheet-shaped sealing resin before pressurizing and vacuum heating having a substantially the same external dimension as the wiring unit body 16 5b is arranged.
[0031]
Next, the solar cell module intermediate body 31 in the third manufacturing process shown in FIG. 7 is created. On the back surface side of the intermediate body 21 shown in FIG. 6, a sheet-shaped sealing resin 5c such as EVA having a size substantially equal to that of the front surface member 2 is disposed, and the back surface member 2 described above is disposed thereon. Place. In detail, the cut line 32 is provided in the sealing resin 5c and the back surface member 3, and the front end portion of the wiring unit body 16 is disposed in a state where the cut line 32 is exposed to the back surface side. Thereafter, the intermediate member 31 is heated in a vacuum while being pressurized, thereby sealing resin between the solar cell 3, the wiring unit body 16, and other wirings disposed between the front surface member 1 and the back surface member 2. 5 spreads, the mutual positional relationship is fixed, and it becomes a sealing structure. As shown in the cross-sectional view of FIG. 7B, as described above, the sealing resin 5 is disposed in the extracted portion 15s, and the area of the interface between the transparent resin 5 and the insulating member 15 that is easily peeled is set. The peeling can be reduced by reducing the size, and the progress of the peeling can be stopped by the sealing resin 5 disposed in the extracted portion 15s.
[0032]
Next, as shown in FIG. 1, the terminal box 8 is installed on the back member 3 via an adhesive such as silicone, and the solar cell module of this embodiment is completed.
[0033]
The terminal box 8 is a substantially flat box made of a plastic material. The terminal box 8 has a plate-like lid 8a on the back side, and the internal structure with the lid 8a removed is shown in FIG. On the back member 8 side of the terminal box 8, there is a cutout portion 8 b having a substantially rectangular shape in plan view. Each notch 8b guides each internal wiring 14 that is the tip of the wiring unit body 16 shown in FIG. 7 into the terminal box.
[0034]
Inside the terminal box 8, rectangular metal terminals 41a, 41ab, 41bc, 41cd, 41d made of metal plates are provided, and these metal terminals 41 are respectively the tip portions of the internal wirings 14a, 14ab, 14bc, 14cd, 14d. And soldered. The metal terminals 41a and 41d for leading out the external output have extended portions 41at and 41dt, and output lines 9 and 9 guided through the extended portions 41at and 41dt and the side wall of the terminal box 8 are provided. Electrical connection. A solar cell protective bypass diode 42 is electrically connected between the internal wirings 14 with the same polarity. With this electrical connection, the protective bypass diode 42 is electrically connected to each solar cell group 12 in parallel and in the opposite direction for each solar cell group 12.
[0035]
【The invention's effect】
As described above, according to the present invention, the wiring includes the parallel wiring arranged along the row direction and the inner wiring connected to the ends of the parallel wiring and connected to the plurality of bypass diodes. And an insulating member for connecting all the inner wirings. Accordingly, when one end of each internal wiring is soldered to the end of each parallel wiring, the operation is easy and the internal wirings are not displaced from each other.
[0036]
In addition, since the insulating member is made of an insulating film and has a cut-out portion, a resin to be sealed is disposed in the cut-out portion, and the area of the interface between the transparent resin and the insulating member that is easily peeled is reduced. While the peeling is reduced, the progress of the peeling can be stopped by the sealing resin disposed in the extracted portion.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, where (a) is a front view and (b) is a right side view.
2 is a rear view of FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view along AA ′ in FIG. 1;
FIG. 4 is a rear view showing an intermediate body during the first production of one embodiment of the present invention.
5 is an enlarged view of the vicinity of the wiring unit body in FIG. 4, (a) is a rear view, (b) is a cross-sectional view along AA ′ in (a), and (c) is BB in (a). 'Cross sectional view, (d) is a cross sectional view along CC' in (a).
FIG. 6 is a rear view showing an intermediate body during the second production of an embodiment of the present invention.
7A and 7B are views showing an intermediate body in the middle of the second production of an embodiment of the present invention, in which FIG. 7A is a rear view, and FIG. 7B is a cross-sectional view along AA ′ in FIG.
FIG. 8 is a plan view showing an internal structure of a terminal box according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Front surface member 3 Back surface member 4 Solar cell 5 Sealing resin 8 Terminal box 12 Solar cell group 13 Parallel wiring 14 Internal wiring 15 Insulation member 15s Extraction part 15x, 15y Connection part 42 Bypass diode

Claims (1)

A front surface member, a back surface member , a plurality of solar cells arranged in a matrix between the front surface member and the back surface member, a light-receiving side sealing resin disposed between the front surface member and the solar cell, A solar cell module comprising: a back surface side sealing resin disposed between the solar cell and the back surface member; and a terminal box disposed on the back surface side of the back surface member and having a plurality of bypass diodes therein. ,
The plurality of solar cells include a plurality of solar cell groups including at least one column of solar cells arranged in electrical connection in the row direction,
Parallel wiring for output derivation respectively electrically connected to the solar cell groups at both ends of the plurality of solar cell groups;
Parallel wiring for electrically connecting in series between adjacent solar cell groups;
A wiring unit body that electrically connects these parallel wiring and the plurality of bypass diodes arranged inside the terminal box,
The wiring unit body is formed by covering a plurality of wirings for electrically wiring the parallel wirings and the plurality of bypass diodes with an insulating film, and has a cutout portion between each wiring,
A sealing resin is disposed between the wiring unit body and a solar cell located below the wiring unit body, and the back surface side sealing resin is disposed and sealed on the back surface side of the wiring unit body. A solar cell module.

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