Solar cell module

This application is a continuation application of International Application No. PCT/JP2013/051977, filed on Jan. 30, 2013, entitled “SOLAR CELL MODULE”, which claims priority based on Article 8 of Patent Cooperation Treaty from prior Japanese Patent Application No. 2012-021693, filed on Feb. 3, 2012, the entire contents of which are incorporated herein by reference.

The invention relates to a solar cell module.

Patent Document 1 describes a solar cell module including: a module main body including solar cells; and a frame. In the solar cell module described in Patent Document 1, the frame is provided so as to surround the module main body. The frame is provided with a groove opened to the module main body, and the module main body is inserted in the groove. Butyl rubber is filled between the groove and the module main body.

Patent Document 1: Japanese Utility Model Registration Application Publication No. Hei 6-17257

There is a demand for further improvement in weather-resistance of a solar cell module.

One aspect of the invention provides a solar cell module with an improved weather-resistance.

A solar cell module of an embodiment includes a rectangular plate-shaped module main body, a frame, and an adhesive member. The module main body includes a solar cell. The module main body includes first and second end surfaces parallel to each other and third and fourth end surfaces parallel to each other. The frame is provided so as to surround the module main body. The frame includes a groove. The module main body is inserted in the groove. The adhesive member is disposed in the groove. The adhesive member bonds the module main body and the frame to each other. The frame includes a first frame section, a second frame section, a third frame section, and a fourth frame section. The first frame section is disposed outside the first end surface. The second frame section is disposed outside the second end surface. The third frame section is disposed outside the third end surface. The third frame section includes end surfaces on both sides, one of the end surfaces facing to an end surface of the first frame section, and the other of the end surfaces facing to an end surface of the second frame section. The fourth frame section is disposed outside the fourth end surface. The fourth frame section includes end surfaces on both sides, one of the end surfaces facing to an end surface of the first frame section, and the other of the end surfaces facing to an end surface of the second frame section. The adhesive member is provided in at least part of portions of the frame except corner portions. Through holes communicating with the groove are provided in the corner portions of the frame.

According to the solar cell module, improved weather-resistance is obtained.

FIG. 1 is a schematic plan view of a solar cell module according to a first embodiment.

FIG. 2 is a schematic plan view of Portion II in FIG. 1 .

FIG. 3 is a schematic side view viewed in the direction of Arrow III in FIG. 1 .

FIG. 4 is a schematic back surface side view of Portion II in FIG. 1 .

FIG. 5 is a schematic side view viewed in the direction of Arrow V in FIG. 1 .

FIG. 6 is a schematic plan view of a solar cell module according to a second embodiment.

Hereinafter, an example of a preferred embodiment in which the invention is carried out is described. However, the embodiment below is merely an example. The invention is not limited to the embodiment below at all.

In addition, in each of the drawings referred to in the embodiment and the like, members with substantially the same functions are denoted by the same reference numerals. Moreover, the drawings referred to in the embodiment and the like are depicted schematically, and the ratios of dimensions and the like of objects depicted in the drawings may be different from actual ones. The ratios of dimensions and the like of objects may vary among the drawings. Specific ratios of dimensions and the like of objects should be determined in consideration of the following description.

First Embodiment

As illustrated in FIGS. 1 to 4 , solar cell module 1 includes module main body 10 and frame 20 . Module main body 10 includes at least one solar cell 11 . Specifically, module main body 10 includes solar cells 11 electrically connected to each other with unillustrated wiring members. Solar cells 11 are disposed in a filler layer provided between a first protection member and a second protection member. Each of the first and second protection members can be made of a glass plate, a resin sheet, a resin sheet provided with a metal layer, or the like.

Module main body 10 has a rectangular shape. Module main body 10 includes first and second end surfaces 10 a and 10 b parallel to each other and third and fourth end surfaces 10 c and 10 d parallel to each other. First and second end surfaces 10 a and 10 b are longer than third and fourth end surfaces 10 c and 10 d.

Frame 20 is provided in a frame shape surrounding module main body 10 . Frame 20 includes groove 20 a in which an edge portion of module main body 10 is inserted.

In groove 20 a , adhesive member 31 is disposed. Adhesive member 31 bonds frame 20 and module main body 10 to each other. As illustrated in FIG. 2 , adhesive member 31 is provided in at least part of a region where frame 20 is provided except regions where corner portions of frame 20 are positioned.

Note that, adhesive member 31 may include, for example, a silicone resin, a silicone rubber, a butyl rubber, a pressure-sensitive adhesive agent, an adhesive member, an pressure-sensitive adhesive tape, an adhesive tape, or the like.

Frame 20 includes first frame section 21 , second frame section 22 , third frame section 23 , and fourth frame section 24 .

First frame section 21 is disposed outside first end surface 10 a . First frame section 21 includes two end surfaces 21 a and 21 b in both end portions in an extending direction of first frame section 21 . Each of two end surfaces 21 a and 21 b extends in a direction inclined with respect to the extending direction of first frame section 21 . Specifically, each of two end surfaces 21 a and 21 b is formed at an angle of approximately 45 degrees with respect to an outer surface (a side surface on a side opposite to a side facing to module main body 10 ) of first frame section 21 .

Second frame section 22 is disposed outside second end surface 10 b . Second frame section 22 includes two end surfaces 22 a and 22 b in both end portions in an extending direction of second frame section 22 . Each of two end surfaces 22 a and 22 b extends in a direction inclined with respect to the extending direction of second frame section 22 . Specifically, each of two end surfaces 22 a and 22 b is formed at an angle of approximately 45 degrees with respect to an outer surface of second frame section 22 .

Third frame section 23 is disposed outside third end surface 10 c . Third frame section 23 includes two end surfaces 23 a and 23 b in both end portions in an extending direction of third frame section 23 . Each of two end surfaces 23 a and 23 b extends in a direction inclined with respect to the extending direction of third frame section 23 . Specifically, each of two end surfaces 23 a and 23 b is formed at an angle of approximately 45 degrees with respect to an outer surface of third frame section 23 . One end surface 23 a of third frame section 23 faces to one end surface 21 a of first frame section 21 . The other end surface 23 b of third frame section 23 faces to one end surface 22 a of second frame section 22 .

Fourth frame section 24 is disposed outside fourth end surface 10 d . Fourth frame section 24 includes two end surfaces 24 a and 24 b in both end portions in an extending direction of fourth frame section 24 . Each of two end surfaces 24 a and 24 b extends in a direction inclined with respect to an extending direction of fourth frame section 24 . Specifically, each of two end surfaces 24 a and 24 b is formed at an angle of approximately 45 degrees with respect to an outer surface of fourth frame section 24 . One end surface 24 a of fourth frame section 24 faces to the other end surface 21 b of first frame section 21 . The other end surface 24 b of fourth frame section 24 faces to the other end surface 22 b of second frame section 22 .

By forming each of the end surfaces of the frame sections at an angle of approximately 45 degrees with respect to the outer surface of the frame section, the end surfaces facing to each other are in contact with each other without any space.

Each of first to fourth frame sections 21 to 24 includes first portion 20 A disposed above an edge portion of principal surface 10 A on a light-receiving surface side of module main body 10 , second portion 20 B disposed above an edge portion of principal surface 10 B on aback surface side of module main body 10 , and third portion 20 C connecting first portion 20 A and second portion 20 B to each other (see FIG. 3 ). First to third portions 20 A, 20 B, and 20 C constitute groove 20 a.

As illustrated in FIGS. 1 and 2 , first portion 20 A is not provided in at least part of each of the four corner portions of frame 20 . Specifically, in first portion 20 A of each of first and second frame sections 21 and 22 , removed portions are provided respectively in both end portions in the extending direction of the first and second frame sections 21 and 22 . First portion 20 A of each of first and second frame sections 21 and 22 has a rectangular shape, and the lengths of first portions 20 A in the extending direction thereof are smaller than the lengths of the first and second frame sections 21 and 22 in the extending direction thereof. The lengths of first portions 20 A of first and second frame sections 21 and 22 in the extending direction thereof are set so that the both end portions of first portions 20 A in the extending direction thereof do not come into contact with third and fourth frame sections 23 and 24 . In the regions where the removed portions are formed, adhesive member 31 is not provided.

As illustrated in FIGS. 3 and 5 , first through hole 20 C 1 communicating with groove 20 a is provided in third portion 20 C in each of the four corner portions of frame 20 where adhesive member 31 is not provided. Specifically, first through hole 20 C 1 is provided in each of the both end portions of first and second frame sections 21 and 22 in the extending direction thereof. First through holes 20 C 1 are formed by notches opened in end surfaces of first and second frame sections 21 and 22 in the extending direction thereof. The notches extend in the extending direction of the first and second frame sections 21 and 22 from the end surfaces of first and second frame sections 21 and 22 to positions where the module main body 10 is disposed. Each of the notches is preferably formed such that a lower edge of the notch can be positioned lower than the back surface of module main body 10 . First through hole 20 C 1 is not provided in any of third and fourth frame sections 23 and 24 . Note that a lower position here is a position in a direction extending from the light-receiving surface side to the back surface side of module main body 10 , and the lower edge of the notch is an edge of the notch on the lower side.

As illustrated in FIG. 5 , second portion 20 B is provided with hollow portion 20 B 5 penetrating each of frame sections 21 to 24 in the extending direction thereof. Hollow portion 20 B 5 has a rectangular cross sectional shape taken perpendicularly to the extending direction of the corresponding one of frame sections 21 to 24 and includes first to fourth wall portions 20 B 1 to 20 B 4 . In other words, groove 20 a is formed by first portion 20 A, first wall portion 20 B which forms an upper wall portion of second portion 20 B, and third portion 20 C. Second wall portion 20 B 2 , which forms a bottom wall portion, is provided with second through hole 20 B 21 communicating with hollow portion 20 B 5 . By through second through hole 20 B 21 , water entering the inside of hollow portion 20 B 5 is drained. Note that second through hole 20 B 21 is provided in each of the end portions of first and second frame sections 21 and 22 in the extending direction thereof in the corner portions of frame 20 . Second through hole 20 B 21 extends in the extending direction of first and second frame sections 21 and 22 from each of the end surfaces of first and second frame sections 21 and 22 to a predetermined position.

Here, when the frame includes four frame sections, it is necessary to prevent deterioration of the appearance of the solar cell module due to extrusion of the adhesive member from spaces between the frame sections. In this respect, it is conceivable that no adhesive member is provided in the corner portions of the frame. However, in this case, spaces where neither the module main body nor the adhesive member is present are formed in the groove in the corner portions of the frame. When water is accumulated in these spaces, the water may enter the module main body and deteriorate characteristics of the solar cell module.

In this respect, first through holes 20 C 1 communicating with groove 20 a are provided in solar cell module 1 . Hence, even when water enters groove 20 a , the water is drained through first through holes 20 C 1 . Hence, water is less likely to be accumulated in groove 20 a . Accordingly, it is possible to suppress the entering of water to the inside of module main body 10 . As a result, solar cell module 1 can be achieved with an improved weather-resistance.

Moreover, in solar cell module 1 , first portions 20 A are not provided in at least part of the corner portions of frame 20 . For this reason, water on principal surface 10 A is drained from principal surface 10 A through the regions where first portion 20 A is not provided. Hence, water is less likely to be accumulated on principal surface 10 A.

Specifically, in first portions 20 A of first and second frame sections 21 and 22 , removed portions are provided in both end portions of first and second frame sections 21 and 22 in the extending direction thereof. Hence, water between principal surface 10 A and first portion 20 A of first frame section 21 , first portion 20 A of each of third and fourth frame sections 23 and 24 can be drained through the removed portion. Likewise, water between principal surface 10 A and first portion 20 A of second frame section 22 , first portion 20 A of each of third and fourth frame sections 23 and 24 can be drained through the removed portion. By employing such a configuration, not only water accumulated near first and second frame sections 21 and 22 is efficiently drained, but also water accumulated near third and fourth frame sections 23 and 24 is efficiently drained.

Moreover, in solar cell module 1 , adhesive member 31 is not provided in at least a region in the corner portions where first portions 20 A are not provided. Hence, unlike the case where an adhesive member raised from the principal surface is present, drainage of water on principal surface 10 A is not inhibited. Hence, water is further less likely to be accumulated on principal surface 10 A. As described above, when adhesive member 31 is not provided in the corner portions to improve the drainage of water on principal surface 10 A, it is more effective to promote the drainage of water in groove 20 a by providing first through holes 20 C 1 .

In solar cell module 1 , first through holes 20 C 1 , removed portions, and hollow portions 20 B 5 are provided only in first and second frame sections 21 and 22 among first to fourth frame sections 21 to 24 . Hence, it is not necessary to conduct processes for providing the through holes and the like in third and fourth frame sections 23 and 24 . Accordingly, frame 20 can be manufactured easily through fewer manufacturing processes. Moreover, second through holes 20 B 21 are also provided in only first and second frame sections 21 and 22 , and are not provided in any of third and fourth frame sections 23 and 24 . Hence, frame 20 can be manufactured easily by fewer manufacturing processes.

The notches constituting the first through holes 20 C 1 and the notches constituting second through holes 20 B 21 , which are provided in first and second frame sections 21 and 22 , are opened in the end surfaces of the first and second frame sections 21 and 22 in the extending direction thereof. In other words, the notches are opened to third and fourth frame sections 23 and 24 . By employing such a configuration, not only water accumulated in groove 20 a and hollow portions 20 B 5 of first and second frame sections 21 and 22 is efficiently drained, but also water accumulated in groove 20 a and hollow portions 20 B 5 of third and fourth frame sections 23 and 24 is efficiently drained.

Note that, in solar cell module 1 , the removed portions are provided in the both end portions of first and second frame sections 21 and 22 in the extending direction thereof, and first portion 20 A is not provided in at least part of each of the four corner portions of frame 20 , as described above. However, the invention is not limited to this configuration. For example, as illustrated in FIG. 6 , it is also possible to provide the removed portion in none of first to fourth frame sections 21 to 24 .