JP2016158362A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a curing time of an adhesive resin, relating to a solar battery module having a structure in which a frame piece having a structure which covers a side surface and a rear surface of an end part of a solar battery module body respectively does not cover a front surface is bonded to the end part of the solar battery module body using an adhesive resin.SOLUTION: A frame body which holds a peripheral end part of a square solar battery module body 110 includes a frame piece 130 having a structure which covers a side surface and a rear surface of an end part of the solar battery module body 110 that covers a front surface. The side surface and the rear surface of the end part of the solar battery module body 110 and a counter surface of the frame piece 130 are bonded and fixed by using an adhesive resin 140 containing air bubble 140a.SELECTED DRAWING: Figure 3

Description

  The present invention includes a frame piece having a structure in which a frame body holding a peripheral end portion of a rectangular solar cell module body covers a side surface and a back surface of the end portion of the solar cell module body, and the surface is not covered. The present invention relates to a solar cell module.

  In recent solar cell modules, in order to efficiently remove dust and dirt accumulated on the surface (light-receiving surface) of the solar cell module body after installation, and also to remove snow, etc., the surface portions of the two opposite frames are removed. Thus, a solar cell module having a structure in which a step between the light receiving surface of the solar cell module main body and the frame end surface is eliminated has been proposed (see, for example, Patent Document 1).

  Specifically, the first frame having a structure in which the frame body that holds the peripheral end portion of the rectangular solar cell module main body covers the surface, the side surface, and the back surface of the two opposite end portions of the solar cell module main body. It comprises a piece and a second frame piece having a structure that covers the side surface and the back surface of the two opposite ends of the solar cell module main body and does not cover the surface.

  According to this structure, dust and dirt accumulated on the light-receiving surface of the solar cell module body, and even snow can be slid down without being caught on the end face of the frame body via the second frame piece side. Can be prevented.

JP 2014-68002 A

  By the way, the 2nd frame piece of the structure which does not cover the surface of a solar cell module main body is adhere | attached and fixed with adhesive resin with respect to the side surface and back surface of the edge part of a solar cell module main body. Therefore, after manufacturing the solar cell module, it is necessary to sufficiently dry the adhesive resin in order to stabilize the mounting position of the solar cell module main body and the second frame piece. There was a problem that the curing time was prolonged for a long time. As a result, the production time of the solar cell module becomes long.

  On the other hand, if the curing period is long, the possibility of receiving an impact in an uncured state during that time increases, and as a result, there is a problem that the probability that a defective product is generated also increases.

  The present invention was devised to solve such problems, and an object thereof is to provide a solar cell module having excellent productivity by shortening the curing time of an adhesive resin.

  In order to solve the above problems, in the solar cell module of the present invention, the frame body that holds the peripheral end portion of the rectangular solar cell module body covers the side surface and the back surface of the end portion of the solar cell module body, And it is a solar cell module provided with the frame piece of the structure which does not cover the surface, Comprising: The said side and the back surface of the said edge part of the said solar cell module main body and the opposing surface of the said frame piece adhere | attached with adhesive resin containing a bubble It is characterized by being fixed.

  According to this configuration, the area where the applied adhesive resin comes into contact with the gas increases, and the drying time is shortened. In this case, it is possible to further shorten the curing time of the adhesive resin by injecting a gas that promotes the curing of the adhesive resin as the gas to be injected.

  Moreover, according to the solar cell module of the present invention, the adhesive resin is preferably a low foam resin. By making the foam low, the surface of the resin can be maintained smoothly.

  Moreover, according to the solar cell module of this invention, it is good also as a structure by which the spacer is arrange | positioned between the said back surface of the said solar cell module main body and the said opposing surface of the said frame piece. By arranging the spacer, the solar cell module main body and the frame piece can be positioned in the height direction, and the thickness of the adhesive resin is also secured to a constant thickness.

  Moreover, according to the solar cell module of this invention, it is good also as a structure by which the said opposing surface of the said frame piece to which the said adhesive resin is apply | coated was formed in the uneven surface. By making the opposing surface an uneven surface, the adhesive strength between the adhesive resin and the frame piece increases.

  Moreover, according to the solar cell module of the present invention, the adhesive resin is applied between the back surface of the solar cell module body and the facing surface of the frame piece, and the solar cell module. It consists of a side adhesive resin applied between the side surface of the main body and the opposing surface of the frame piece, and more bubbles are mixed in the back side adhesive resin with respect to the side surface side adhesive resin. It is good also as a structure.

  The adhesion area is basically wider on the back surface side than the side surface side of the solar cell module body. Accordingly, since the back side has fewer parts that come into contact with the outside air, the drying speed is slower on the back side than on the side. Therefore, the drying speed of the back surface side adhesive resin can be increased to the same level as the drying speed of the side surface side adhesive resin by mixing more bubbles in the back surface side adhesive resin with respect to the side surface side adhesive resin.

  According to the present invention, the area where the applied adhesive resin comes into contact with the gas increases, and the drying time of the resin can be shortened. Therefore, a solar cell module excellent in productivity can be provided. In addition, since the curing time is shortened, it is possible to reduce the occurrence of defective products due to impact or the like in an uncured state.

It is a perspective view which shows typically a mode that the solar cell module which concerns on this invention was seen from the light-receiving surface side. It is A-A 'sectional drawing of the solar cell module shown in FIG. It is B-B 'sectional drawing of the solar cell module shown in FIG. 1 is a schematic cross-sectional view schematically showing an adhesive structure according to a first embodiment. FIG. 6 is a schematic cross-sectional view schematically showing an adhesion structure according to a second embodiment. FIG. 6 is a schematic cross-sectional view schematically showing an adhesive structure according to a third embodiment. It is a schematic sectional drawing which shows typically the adhesion structure concerning Embodiment 4. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view schematically showing the solar cell module 101 as viewed from the light receiving surface 110a side.

  The solar cell module 101 according to the present embodiment includes a solar cell module main body 110, horizontal frames 130 and 131 and vertical frames 120 and 121 that are frames that hold the peripheral end of the solar cell module main body 110. Yes.

  The solar cell module main body 110 has a configuration in which a translucent base material, a sealing resin, a solar battery cell, a sealing resin, and a back surface side protective material are sequentially stacked from the light receiving surface 110a side.

  In the present embodiment, a glass substrate is used as the translucent substrate, and EVA (ethylene vinyl acetate resin) is used as the sealing resin. Further, a solar battery cell using a polycrystalline silicon wafer is used as the solar battery cell, and a multilayer sheet in which a PET sheet is laminated is used as the back surface side protective material. In addition, although description is abbreviate | omitted in FIG. 1, in order to obtain output power sufficient as a solar cell module, the several photovoltaic cell is electrically connected in series using internal wiring. Further, the solar cell module has two extraction electrodes on the positive electrode side and the negative electrode side, one end of each extraction electrode is electrically connected to the solar cell, and one end on the opposite side of the extraction electrode is not shown. It is electrically connected to the terminal box.

  The solar cell module 101 is formed by fitting a frame body into a side portion of a substantially rectangular solar cell module main body 110. Here, let four sides which comprise the light-receiving surface 110a of the solar cell module main body 110 be a pair of vertical sides and a pair of horizontal sides.

  In solar cell module 101 according to the present embodiment, vertical frames 120 and 121 are fitted into a pair of opposing vertical sides 111 and 112 of solar cell module body 110, and vertical frames 120 and 121 are respectively vertical sides. 111 and 112 are close to each other. Further, the horizontal frames 130 and 131 are respectively fitted into another pair of opposing lateral sides 113 and 114 of the solar cell module body 110, and the lateral frames 130 and 131 are close to the lateral sides 113 and 114, respectively. Yes.

  The vertical frames 120 and 121 are close to the vertical sides 111 and 112 of the solar cell module body 110, respectively, and cover the light receiving surface 110a and the back surface of the side portion. Here, the back surface is a surface on the opposite side of the light receiving surface 110a.

  On the other hand, the horizontal frames 130 and 131 are close to the horizontal sides 113 and 114 of the solar cell module main body 110, respectively, but do not cover the light receiving surface 110a of the solar cell module main body 110. As described above, since the horizontal frames 130 and 131 do not cover the light receiving surfaces 110a of the pair of horizontal sides 113 and 114 of the solar cell module body 110, the volume of the frame body can be reduced, and the solar cell module 101 can be reduced. Can be reduced in weight.

  The solar cell module 101 having such a configuration is disposed on a gantry or a roof so as to be inclined along the longitudinal direction of the vertical frames 120 and 121 such that one horizontal side 114 is high and the other horizontal side 113 is low. It can be attached to a crosspiece. Therefore, when rain falls on the solar cell module 101, the horizontal frames 130 and 131 do not cover the light receiving surface 110a of the solar cell module main body 110, so that rainwater smoothly covers the light receiving surface 110a of the solar cell module 101. It will flow down. Therefore, it is possible to prevent rainwater containing dust and dust from staying on the light receiving surface and evaporating, and depositing dust and dust on the light receiving surface to reduce the amount of power generation.

  In addition, even when snow is accumulated, the snow on the light receiving surface slides smoothly, so that it is possible to avoid an event that the snow remains on the light receiving surface for a long time and the power generation amount does not recover. Since the horizontal frames 130 and 131 have the same structure, even if the solar cell modules 101 are continuously installed in the vertical direction, the flow of water and the falling snow fall are not hindered.

  FIG. 2 is a cross-sectional view taken along the line A-A ′ of the solar cell module 101 shown in FIG. 1, and shows the relationship between the vertical side 111 of the solar cell module body 110 and the vertical frame 120.

  The vertical frame 120 is formed by extrusion of aluminum. The vertical frame 120 includes a fitting portion 122, a box portion 123, and a flange portion 124. The fitting portion 122 is located above the box portion 123, and is formed in a C shape in which an upper piece 122a, a side piece (side surface) 122b, and a lower piece 122c are connected. The box portion 123 has a shape in which an upper piece 123a, an inner piece 123b, a lower piece 123c, and an outer piece 123d are connected in a box shape. A partition piece is formed on the inner piece 123b, and the inner piece 123b and the outer piece 123d Are connected. Further, screw holes 123e and 123e are formed in a part of the inner piece 123b. The lower piece 122 c of the fitting portion 122 is shared with the upper piece 123 a of the box portion 123. The flange portion 124 is formed by extending the lower piece of the box portion 123 toward the inside of the solar cell module main body 110. The front end of the flange portion 124 is formed to be bent slightly upward. The partition piece can be omitted depending on the structure of the frame.

  An elastic body 150 made of an elastomer resin is disposed between the vertical side 111 and the vertical frame 120 of the solar cell module main body 110. The elastic body 150 is in close contact with the inner wall of the fitting portion 122. In the present embodiment, an elastic body 150 whose cross section is formed in a substantially C shape in accordance with the shape of the inner wall of the fitting portion 122 is used. The vertical frame 120 is attached to the vertical side 111 of the solar cell module main body 110 by inserting the vertical side 111 of the solar cell module main body 110 into the fitting portion 122 of the vertical frame 120. The elastic body 150 sandwiched between the fitting portion 122 and the vertical side 111 of the solar cell module main body 110 is compressed and comes into contact with the fitting portion 122 and the vertical side 111 of the solar cell module main body 110 to form the vertical frame 120. It has a function of making it difficult to transmit the applied impact to the solar cell module body 110. In addition, the solar cell module main body 110 has a function of more reliably sealing the end surface including the vertical side 111 and preventing entry of moisture and the like. As the elastic body 150, butyl rubber, silicone resin, synthetic rubber, or the like may be used in addition to the elastomer resin.

  The relationship between the vertical side 112 of the solar cell module main body 110 and the vertical frame 121 is the same as the relationship between the vertical side 111 of the solar cell module main body 110 and the vertical frame 120 shown in FIG. The description about the relationship between the vertical side 112 of the battery module main body 110 and the vertical frame 121 is abbreviate | omitted.

  FIG. 3 is a cross-sectional view taken along the line B-B ′ of the solar cell module 101 shown in FIG. 1, and shows the relationship between the horizontal side 113 of the solar cell module body 110 and the horizontal frame 130.

  The horizontal frame 130 is formed by extrusion of aluminum in the same manner as the vertical frames 120 and 121. The horizontal frame 130 is attached close to the horizontal side 113 of the solar cell module main body 110. The horizontal frame 130 includes a support part 132, an extension part 133, a protrusion part 134, and a flange part 135.

  The horizontal frame 130 does not cover the light receiving surface 110a of the solar cell module main body 110, and the upper end surface of the horizontal frame 130 is substantially flush with the light receiving surface 110a of the solar cell module main body 110.

  More specifically, the support portion 132 of the horizontal frame 130 includes a horizontal piece 132a and a vertical piece 132b. The front end surface 132b1 of the vertical piece 132b of the support portion 132 is substantially on the same surface as the light receiving surface 110a of the solar cell module body 110. However, the front end surface 132b1 of the vertical piece 132b may be below the light receiving surface 110a of the solar cell module body 110.

  The elongated portion 133 is not flush with the vertical piece 132b of the support portion 132, and is recessed in one step from the vertical piece 132b of the support portion 132 to the solar cell module main body 110 side at a portion that is not both ends of the horizontal piece 132a. Connected to the lateral piece 132a.

  The flange portion 135 is connected so as to receive the lower end portion of the vertical piece 132b, and is disposed in parallel with the horizontal piece 132a of the support portion 132. That is, the flange part 135 is extended inside the lower surface of the solar cell module main body 110 from the connection part with the vertical piece 132b.

  With such a structure, the load applied to the horizontal piece 132a of the support portion 132 can be received by the extending portion 133 and the flange portion 135 with a good balance.

  Further, an adhesive resin 140 made of silicone resin or the like is disposed between the back surface 113a of the horizontal side 113 of the solar cell module body 110 and the opposing surface 132a1 of the horizontal piece 132a of the support portion 132 of the horizontal frame 130. Further, an adhesive resin 140 made of silicone resin or the like is also disposed between the end surface 113b of the horizontal side 113 of the solar cell module body 110 and the opposing surface 132b2 of the vertical piece 132b of the support portion 132. By adopting such a structure, the bonding area between the solar cell module main body 110 and the horizontal frame 130 is widened, so that the bonding strength between the solar cell module main body 110 and the horizontal frame 130 can be increased. In addition, since the silicone resin has high weather resistance and can maintain high adhesive strength, the long-term reliability of the solar cell module 101 can be ensured. The adhesive resin 140 is not limited to a silicone resin.

  The relationship between the other lateral side 114 of the solar cell module body 110 and the other lateral frame 131 is also the same as the relationship between the lateral side 113 of the solar cell module body 110 and the lateral frame 130 shown in FIG. Here, the description of the relationship between the horizontal side 114 and the horizontal frame 131 is omitted.

  Next, an embodiment of an adhesive structure in which the horizontal frames 130 and 131 and the horizontal sides 113 and 114 of the solar cell module main body 110 are bonded with the adhesive resin 140 in the solar cell module 101 having the above configuration will be described.

<Embodiment 1>
FIG. 4 is a schematic cross-sectional view schematically showing the bonding structure according to the first embodiment.

  In the first embodiment, the adhesive resin 140 is a bubble-containing adhesive resin in which a large number of bubbles 140a are mixed. Specifically, the adhesive resin 140 is formed of a foam made of silicone resin. In the first embodiment, the air bubbles 140a are mixed almost uniformly throughout the applied adhesive resin 140.

  As a method for mixing bubbles, a conventionally known foaming method using a resin can be used. Examples of the foaming method include a cast foam molding method, a melt foam molding method, and a solid phase foam molding method.

  As the casting foam molding method, an adhesive resin and a foaming material that are stirred (and optionally added with a curing agent) are poured between the lateral side 113 and the lateral frame 130 of the solar cell module body 110. Examples thereof include panel foaming, and spray foaming in which an adhesive resin and a foaming material are stirred on the horizontal frame 130 (in some cases, a stiffening agent is also added) and sprayed directly with a spray. .

  As the solid-phase foam molding method, solid pre-expanded particles are prepared and filled between the horizontal side 113 and the horizontal frame 130 of the solar cell module body 110, and heat is applied thereto to promote the reaction. The bead method etc. which shape | mold can be illustrated.

  The melt-foam molding method for generating bubbles in a heat-smelted synthetic resin includes two-stage pressure foaming, in which a raw material kneaded with a foaming agent is foamed again, or one-stage addition in which gas is blown into an extruder and continuously molded. An example is pressure foaming.

  According to the first embodiment, the area where the applied adhesive resin 140 comes into contact with the gas increases, and the drying time is shortened. In this case, in order to further shorten the curing time of the adhesive resin 140, a silicone resin of a type that cures with heat and moisture (moisture curable adhesive resin) is used as the adhesive resin 140. Therefore, curing can be further promoted by using air having a high water vapor content. In addition to this, curing can be promoted by using a curing agent mixed type silicone resin. However, these are merely examples, and the adhesive resin 140 is not limited to such a moisture curing type or a curing agent mixed type. Resins other than silicone resin such as epoxy resin can also be used.

  The adhesive resin 140 is preferably a low foam resin. By making the foam low, the surface of the resin can be maintained smoothly.

  Here, the degree of foaming (foaming ratio) is desirably about 105 to 200%, but considering the strength as an adhesive, it is more preferably about 105 to 130%.

In the present specification, the expansion ratio is the ratio A / B between the density A (g / cm ³ ) without foaming and the density B (g / cm ³ ) of the foam. The density A without foaming is obtained by curing the adhesive resin without foaming, measuring the volume (cm ³ ) and weight (g), and calculating the ratio (weight / volume). Can do. The density B of the foam can be obtained by foaming to cure the adhesive resin, measuring the volume and weight, and calculating the ratio.

  In consideration of the strength as an adhesive, the surface of the adhesive resin 140 exposed to the outside air may be smoothly processed by pressing, for example, a resin spatula so that no traces of bubbles remain on the surface. desirable. If traces of bubbles remain on the surface (that is, fine concave portions appear on the surface), dust or the like accumulates on the surface, causing dirt, and cracks or the like are generated from the concave portions. Become. For this reason, the surface of the adhesive resin 140 exposed to the outside air is preferably a smooth flat surface.

  According to the first embodiment, in addition to shortening the drying time, it is expected that the weight of the product is reduced, the adhesive resin 140 is further elasticized by introducing bubbles, and the dielectric constant is reduced as an electrical property. .

<Embodiment 2>
FIG. 5 is a schematic cross-sectional view schematically showing the bonding structure according to the second embodiment.

  In the second embodiment, in addition to the configuration of the first embodiment, an elastic body such as rubber is provided between the back surface 113a of the lateral side 113 of the solar cell module body 110 and the opposing surface 132a1 of the lateral piece 132a of the lateral frame 130. The spacer 170 made of is arranged. The spacer 170 is formed in, for example, a small piece of a cube shape, and the small piece is disposed on a facing surface 132a1 of the horizontal piece 132a at a plurality of positions with a predetermined interval in the longitudinal direction (perpendicular to the paper surface in FIG. 5). That's fine.

  By disposing the spacer 170, the solar cell module body 110 can be positioned in the height direction with respect to the horizontal frame 130 during bonding. Further, by arranging the spacer 170, the thickness of the adhesive resin 140 between the back surface 113a of the lateral side 113 of the solar cell module body 110 and the opposing surface 132a1 of the lateral piece 132a of the lateral frame 130 is ensured to be a constant thickness. And the adhesive strength is maintained.

  The spacer 170 is desirably arranged near the center in the width direction of the horizontal piece 132a of the support portion 132. The spacer 170 is not necessarily disposed from end to end in the length direction of the horizontal frame 130, and a plurality of spacers 170 shorter than the length of the horizontal frame 130 may be disposed. For example, with respect to the length direction of the horizontal frame 130, it can arrange | position in at least 3 places of a center part and both ends.

  By arranging a plurality at intervals, the adhesive resin 140 spreads over the entire surface between the horizontal piece 132a and the opposing surface 132a1.

<Embodiment 3>
FIG. 6 is a schematic cross-sectional view schematically showing the bonding structure according to the third embodiment.

  In the third embodiment, in addition to the first embodiment or the second embodiment, the opposing surface 132a1 of the horizontal piece 132a of the horizontal frame 130 to which the adhesive resin 140 is applied is formed on an uneven surface made up of a large number of small protrusions. Has been. By making the opposing surface 132a1 as an uneven surface in this way, the surface area of the opposing surface 132a1 increases, so that the adhesive strength between the adhesive resin 140 and the horizontal frame 130 can be increased.

<Embodiment 4>
FIG. 7 is a schematic cross-sectional view schematically showing the bonding structure according to the fourth embodiment.

  In the fourth embodiment, the adhesive resin 140 includes a back surface side adhesive resin 141 applied between the back surface 113a of the horizontal side 113 of the solar cell module body 110 and the opposing surface 132a1 of the horizontal piece 132a of the horizontal frame 130; The side surface adhesive resin 142 is applied between the end surface 113b of the horizontal side 113 of the solar cell module body 110 and the opposing surface 132b2 of the vertical piece 132b of the horizontal frame 130, and the back surface side with respect to the side surface side adhesive resin 142. The configuration is such that more bubbles 140 a are mixed in the adhesive resin 141.

  The adhesion area is basically wider on the back surface 113a side than on the end surface 113b side of the solar cell module body 110. Therefore, since the back surface side adhesive resin 141 on the back surface 113a side is less exposed to outside air, the drying speed of the back surface side adhesive resin 141 on the back surface 113a side is slower than that on the side surface side adhesive resin 142 on the end surface 113b side. Therefore, the back surface side adhesive resin 142 is mixed with more bubbles 140a in the back surface side adhesive resin 141, so that the drying speed of the back surface side adhesive resin 141 is about the same as the drying speed of the side surface side adhesive resin 142. You can expedite.

  In addition, as a method of changing the mixing ratio of bubbles depending on the part, for example, two foam nozzles for the back surface side adhesive resin 141 and the side surface side adhesive resin 142 are prepared, and pressures suitable for the respective conditions are prepared from the respective nozzles. At the same time, the adhesive resin may be extracted and applied in parallel. In this case, for example, the back surface side adhesive resin 141 is foamed at a foaming ratio of 130%, and the side surface side adhesive resin 142 is foamed at a foaming rate of 105%. Many bubbles 140a can be mixed.

  In the fourth embodiment, the adhesive resin 140 is described as being divided into two parts. However, for example, the back surface side adhesive resin 141 is further divided into two parts to divide the adhesive resin 140 into three parts as a whole. It is also possible to change the bubble mixing ratio.

  Moreover, in the said embodiment, although the structure which does not cover the surface of the solar cell module main body 110 is only the horizontal frames 130 and 131, the vertical frames 120 and 121 are structures which do not cover the surface of the solar cell module main body 110. The present invention is also applicable. That is, the present invention can be applied to a solar cell module having a structure in which all four sides of the frame do not cover the surface of the solar cell module main body 110 and all four sides are bonded and fixed.

  It should be noted that the embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiment, but is defined based on the description of the scope of claims. Moreover, all the changes within the meaning and range equivalent to a claim are included.

DESCRIPTION OF SYMBOLS 101 Solar cell module 110 Solar cell module main body 110a Light-receiving surface 111,112 Vertical side 113,114 Horizontal side 113a Back surface 113b End surface 120,121 Vertical frame 122 Fitting part 123 Box part 124 Flange part 130,131 Horizontal frame 132 Support part 132a Horizontal piece 132a1 Opposing surface 132b Vertical piece 132b2 Opposing surface 133 Elongating part 134 Protruding part 135 Flange part 140 Adhesive resin 140a Air bubble 141 Back side adhesive resin 142 Side side adhesive resin 150 Elastic body 170 Spacer

Claims (5)

A solar cell provided with a frame piece having a structure in which a frame body holding a peripheral end portion of a rectangular solar cell module body covers a side surface and a back surface of the end portion of the solar cell module body, and the surface is not covered A module,
The solar cell module, wherein the side surface and the back surface of the end portion of the solar cell module main body and the opposing surface of the frame piece are bonded and fixed with an adhesive resin containing bubbles. The solar cell module according to claim 1,
The solar cell module, wherein the adhesive resin is a low foam resin. The solar cell module according to claim 1 or 2, wherein
The solar cell module characterized by the spacer being arrange | positioned between the said back surface of the said solar cell module main body, and the said opposing surface of the said frame piece. The solar cell module according to any one of claims 1 to 3, wherein
The solar cell module, wherein the facing surface of the frame piece to which the adhesive resin is applied is formed in an uneven surface. The solar cell module according to any one of claims 1 to 4, wherein:
The adhesive resin includes a back surface side adhesive resin applied between the back surface of the solar cell module body and the facing surface of the frame piece, and the side surface of the solar cell module body and the facing surface of the frame piece. It consists of side-side adhesive resin applied between
The solar cell module, wherein more air bubbles are mixed in the back side adhesive resin than in the side side adhesive resin.

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