WO2018061758A1

WO2018061758A1 - Solar battery module

Info

Publication number: WO2018061758A1
Application number: PCT/JP2017/032971
Authority: WO
Inventors: 大裕岩田; 淳平入川; 大介藤嶋; 篠原　亘; 幹朗田口
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-09-29
Filing date: 2017-09-13
Publication date: 2018-04-05

Abstract

A solar battery module 10 is provided with a plurality of solar battery cells 1 and a front surface glass 2 disposed on a light receiving side where light is mainly incident with respect to the plurality of solar battery cells 1. The solar battery module 10 is also provided with a back surface glass 3 which is disposed on the opposite side from the light receiving side with respect to the plurality of solar battery cells 1, and which is made of glass. The back surface glass 3 is provided with a plurality of through-holes for passing a plurality of output wires which are electrically connected to the solar battery cells 1 and which are electrically connected to the same terminal box. Each of the through-holes extends in a thickness direction of the back surface glass 3 and has a substantially rectangular shape in a cross section perpendicular to the thickness direction. The plurality of through-holes include a through-hole for passing two or more output wires.

Description

Solar cell module

This disclosure relates to a solar cell module.

Conventionally, as a solar cell module, there is one described in Patent Document 1. This solar cell module includes a plurality of solar cells, a translucent surface protection member is disposed on the front surface side of the plurality of solar cells, and a back surface protection member is disposed on the back surface side. The front side is a light receiving side on which light is mainly incident, and the back side is the opposite side. The plurality of solar cells are arranged in a double row. Two or more solar cells arranged on the same straight line in each row are connected in series. The two or more solar cells and the wiring material connecting them in series constitute a string.

The back surface protection member is made of glass (hereinafter referred to as back glass). By providing the back surface protection member, the solar battery cell has excellent load resistance, and water entry from the outside is also efficiently suppressed. A terminal box is attached to the outer surface of the back glass, and the back glass is provided with a plurality of cylindrical holes (hereinafter simply referred to as round holes). The plurality of round holes are spaced from each other on the same straight line extending in a direction substantially orthogonal to the extending direction of the strings (direction in which the strings are arranged). The output wiring for taking out the electrical output from the solar battery cell is electrically connected to the terminal in the terminal box after passing through the round hole. The opening area of each round hole is set to such a size that only one output wiring can pass through, and only one output wiring passes through each round hole.

International Publication No. 2014/002329

When the back side protection member of the solar cell module is formed of the back glass and the through hole for passing the output wiring is provided in the back glass, there is a risk that moisture passes through the through hole and enters the solar cell module. Therefore, since there is a possibility that the solar battery cell may be deteriorated due to the permeation of moisture, it is preferable that the opening of the through hole is small.

On the other hand, the opening area of the through hole needs to be set to a size through which the output wiring can pass. Specifically, the length in the width direction of the output wiring at the opening of the through hole needs to be set longer than the width of the output wiring, and the length in the direction perpendicular to the width direction of the opening is near the through hole. Therefore, it is necessary to set in consideration of the bent shape of the output wiring.

In such a background, in the solar cell module of Patent Document 1, since the through hole provided in the back glass is a round hole, it is orthogonal to the width direction of the opening due to the bending of the output wiring in the vicinity of the through hole. The length in the direction is increased, and the gap between the through hole and the output wiring is increased. For this reason, moisture easily passes through the through-holes, and it is difficult for moisture to enter the solar cell module, and the solar cells in the solar cell module may be deteriorated due to moisture penetration.

Therefore, the purpose of the present disclosure is to reduce the gap between the through-hole provided in the back glass member and the output wiring passing through the through-hole, and it is difficult for moisture to pass through the through-hole and hardly cause deterioration due to moisture intrusion. The object is to provide a solar cell module.

A solar cell module which is one embodiment of the present disclosure includes a plurality of solar cells, a translucent front-side member provided on a light receiving side on which light mainly enters the plurality of solar cells, and a plurality of solar cells. A back glass member made of glass and provided on the opposite side of the light receiving side, and the back glass member is electrically connected to the solar cells and electrically connected to the same terminal box One or more through-holes that allow a plurality of output wires connected to each other to pass through are provided, and the through-holes extend in the thickness direction of the back glass member and have a substantially rectangular shape on a cut surface perpendicular to the thickness direction. Have.

According to the solar cell module of one aspect of the present disclosure, each through-hole provided in the back glass member extends in the thickness direction of the back glass member, and has a substantially rectangular shape in a cut surface perpendicular to the thickness direction. Have Therefore, in comparison with the case where the through hole is a round hole, the length in the direction perpendicular to the width direction of the output wiring passing through the through hole in the opening of the through hole is approximately the same as the length necessary for bending the output wiring. It becomes easy to set the length. Therefore, the gap between the through-hole provided in the back glass member and the output wiring passing through the through-hole can be reduced, and the moisture does not easily pass through the through-hole, thereby suppressing the deterioration of the solar cell module due to the ingress of moisture. it can.

It is a mimetic diagram showing the back side of the solar cell module concerning one embodiment of this indication. It is a figure which shows a part of AA sectional view taken on the line of FIG. It is a figure which shows arrangement | positioning of the two rectangular holes provided in the back glass. It is a figure corresponding to FIG. 3 in the solar cell module of a reference example, and is the figure which provided five identical round holes on the same straight line extended in the Y direction in a back surface glass. It is a schematic cross section around a round hole in the solar cell module of the reference example. It is a schematic diagram showing the comparison of the manufacturing cost and opening area in the some through-hole pattern provided in back glass. It is a figure explaining the predominance in the case of providing two rectangular holes in a back glass with respect to the case where one rectangular hole is provided in a back glass. It is a figure explaining the advantage at the time of providing two rectangular holes in a back glass with respect to the case where a plurality of round holes are provided in a back glass. (A) is a laminate in a reference example in which the front filler and the back filler are made of a material having the same degree of hardness and a material having the same degree of fluidity (reciprocal of viscosity) at the temperature at which the lamination is performed. It is a schematic cross section which shows the state before a process. Moreover, (b) is a schematic cross-sectional view showing a state after lamination processing of the reference example shown in (a). Moreover, (c) is a schematic cross-sectional view after lamination corresponding to (b) in the present embodiment. It is a schematic diagram when a part of back glass in the solar cell module of a modification is seen from the back side. When viewed from the thickness direction of the solar cell module, it is a schematic cross-sectional view including a central axis of a rectangular hole in a modification including a front filler, a back filler, and an additional filler in a region overlapping with the rectangular hole.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In addition, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the features of the embodiments and modifications described below.

In the following description, in the solar cell module 10, the side on which sunlight is mainly incident (over 50% to 100%) is the light receiving side (front side), and the side opposite to the front side is the back side. In the following description and drawings, the X direction is an extending direction of the string 50 described below, and the Y direction is a direction orthogonal to the X direction. This is the direction of the alignment. Further, the Z direction is a direction orthogonal to the X direction and the Y direction, and is the thickness direction of the solar cell module 10. Further, the

rectangular holes

21a, 21b, 121a to 121c, 221a to 221c, 321a, 321b, and 421 described in the following embodiments and modifications are all through-holes that penetrate the back glass member in the thickness direction.

FIG. 1 is a schematic diagram showing the back side of a solar cell module 10 according to an embodiment of the present disclosure. FIG. 2 is a diagram showing a part of a cross-sectional view taken along line AA of FIG.

As shown in FIG. 1, the solar cell module 10 has a flat plate-like structure having a substantially rectangular shape in plan view, and includes a terminal box 60 on one side in the longitudinal direction (X direction) of the rectangular shape. As shown in FIG. 2, the solar cell module 10 includes a plurality of solar cells 1, a front glass member (hereinafter simply referred to as surface glass) 2 as an example of a translucent front member, a back glass member (hereinafter referred to as “surface glass”). 3), a wiring material 4 and a sealing material 5.

The solar battery cell 1 is made of a crystalline semiconductor made of, for example, single crystal silicon or polycrystalline silicon. The solar battery cell 1 has, for example, an n-type region and a p-type region, and a junction for generating an electric field for carrier separation is provided at an interface portion between the n-type region and the p-type region. Although the upper surface of the photovoltaic cell 1 has a substantially square shape, for example, it is not restricted to this. As the solar cell 1, any known structure may be used, and any shape may be used.

The surface glass 2 is provided on the light receiving side where light mainly enters the plurality of solar cells 1 and protects the front side of the solar cell module 10. The surface glass 2 is made of tempered glass having translucency, and the thickness thereof is 0.5 mm to 4.0 mm, preferably about 2.0 mm to 3.2 mm. In addition, as a translucent front side member, not only tempered glass but translucent members, such as translucent plastic, can be used.

The back glass 3 is provided on the side opposite to the light receiving side with respect to the plurality of solar cells 1 and is made of glass. The back glass 3 protects the back side of the solar cell module 10. The back glass 3 is made of tempered glass having a thickness of 0.5 mm to 4.0 mm, preferably about 2.0 mm to 3.2 mm, and is configured to have weather resistance. The back glass 3 may be translucent or non-translucent.

The wiring member 4 electrically connects the electrode on the light receiving surface side of one solar cell 1 and the electrode on the back surface side of the other solar cell 1 in two solar cells 1 adjacent in the X direction. The wiring member 4 is attached to each electrode with an adhesive or the like. The wiring member 4 is preferably composed of, for example, a thin copper foil and solder plated on the surface of the copper foil, but may be composed of any other conductor.

The sealing material 5 is filled between the front glass 2 and the back glass 3 and seals the plurality of solar cells 1 between the front glass 2 and the back glass 3. The sealing material 5 includes a front filler 5a and a back filler 5b. The front filler 5a is disposed between the surface glass 2 and the solar battery cell 1, whereas the back filler 5b is a solar filler. Arranged between the battery cell 1 and the back glass 3. The front filler 5a is made of a material having excellent translucency, and the back filler 5b is made of a transparent or colored filler. For example, the front filler 5a is made of a transparent filler, and the back filler 5b is made of a white filler that reflects light efficiently. The encapsulating material 5 includes a front filler 5a excellent in translucency and a back filler 5b excellent in the property of reflecting light, thereby improving the light utilization efficiency.

The front filler 5a and the back filler 5b are laminated by laminating at a temperature of about 100 to 160 ° C. For example, the front filler 5a is laminated on the surface glass 2, and then the solar battery cell 1 and the wiring material 4 are placed, the back filler 5b and the back glass 3 are laminated thereon, and heated in this state. Press to integrate. In addition, on the back glass 3, you may laminate | stack the back filler 5b, the photovoltaic cell 1, the wiring material 4, the surface filler 5a, and the surface glass 2, and may pressurize, heating. The back filler 5b is made of a material satisfying at least one of having a hardness higher than that of the front filler 5a and a fluidity lower than that of the front filler 5a at the temperature at which the lamination process is performed. The front filler 5a is preferably composed of, for example, an ethylene / vinyl acetate copolymer or polyolefin, but is not limited thereto. The back filler 5b is preferably composed of, for example, an ethylene / vinyl acetate copolymer or polyolefin, but is not limited thereto.

Referring to FIG. 1 again, the plurality of solar cells 1 are arranged in a matrix on one side in the X direction with respect to the terminal box 60. Two or more photovoltaic cells 1 arranged on the same straight line along the X direction are connected in series by a wiring member 4. The two or more solar cells 1 and the wiring member 4 connecting the two or more solar cells 1 in series constitute a string 50.

In the example shown in FIG. 1, in two strings 50 adjacent to each other in the Y direction, the solar cells 1 at one end in the X direction are connected in series by the relay wiring 30 and all the solar cells 1 are connected in series. The As a result, the solar cell 1a arranged on the most terminal box 60 side in the X direction and on the rightmost side in the drawing is arranged on the highest potential side, and arranged on the most terminal box 60 side in the X direction and on the most left side on the drawing. The provided solar battery cell 1b is disposed on the lowest potential side.

The solar cell module 10 includes five

output wirings

30a, 30b, 30c, 30d, and 30e for electrically connecting to the terminals of the terminal box 60 on the terminal box 60 side in the X direction. The surface of each

output wiring

30a, 30b, 30c, 30d, 30e is covered with an insulating member such as an insulating film. Of the five

output wirings

30a, 30b, 30c, 30d, and 30e, the three

output wirings

30b, 30c, and 30d also have a function of connecting two adjacent strings 50 in series. The output wiring 30a is arranged on the rightmost side in the Y direction and is electrically connected to the high potential side of the string 50 on the highest potential side, and the output wiring 30b is arranged in the second column from the right in the Y direction. Then, it is electrically connected to the lowest potential side of the second highest potential string 50. The output wiring 30c is arranged in the fourth column from the right in the Y direction and is electrically connected to the lowest potential side of the fourth highest potential string 50, and the output wiring 30d is from the right in the Y direction. It is arranged in the sixth column and is electrically connected to the highest potential side of the sixth highest potential string 50. The output wiring 30e is arranged in the eighth column from the right in the Y direction and is electrically connected to the lowest potential side of the string 50 having the lowest potential.

The terminal box 60 is attached to the back surface of the back glass 3. As will be described in detail later with reference to FIG. 3 and subsequent figures, the back glass 3 is provided with two through-holes having a rectangular cross section (hereinafter simply referred to as rectangular holes). Each

output wiring

30a, 30b, 30c, 30d, 30e is electrically connected to a predetermined terminal of the terminal box 60 after passing through one of the two rectangular holes. Although not described in detail, a bypass diode for preventing backflow is provided between the terminals in the terminal box 60. If a light-shielding object such as fallen leaves covers a specific solar cell 1, the amount of power generated by the solar cell 1 may be reduced and heat may be generated. The two strings 50 connected in series including the solar battery cells 1 whose power generation amount has decreased are short-circuited by a bypass diode. As a result, almost no current flows through the two strings 50, and damage to the solar battery cell 1 due to heat generation is suppressed. The electric power from the solar cell module 10 is taken out by the two

power supply wirings

40 and 41 electrically connected to the terminals of the terminal box 60.

FIG. 3 is a diagram showing the arrangement of the two

rectangular holes

21 a and 21 b provided in the back glass 3. As shown in FIG. 3, the two

rectangular holes

21a and 21b are located on the same straight line extending in the Y direction with a space in the Y direction. The longitudinal direction of the rectangular opening of each

rectangular hole

21a, 21b substantially coincides with the extending direction of the same straight line. The sum of the output wirings (30a, 30b, 30c, 30d, 30e) passing through the

rectangular holes

21a, 21b is an odd number. In this case, the length of one rectangular hole 21a in the extending direction (Y direction) is 55% to 70% of the length of the other rectangular hole 21b in the extending direction (Y direction). However, the length may be shorter than 55% or may be longer than 70%. Note that the total of the output wirings passing through the two rectangular holes may be an odd number other than 5, unlike the present embodiment. Also in this case, the length of one rectangular hole in the extending direction (Y direction) is 55% to 70% of the length of the other rectangular hole in the extending direction (Y direction). However, the length may be shorter than 55% or may be longer than 70%. Further, the aspect ratio of each

rectangular hole

21a, 21b (ratio of the length in the short direction (width direction) in the rectangular opening to the length in the longitudinal direction in the rectangular opening) is set to 5% or more and 30% or less. However, it may be smaller than 5% or larger than 70%. Although not shown, when the total number of output wires (30a, 30b, 30c, 30d, 30e) passing through the

rectangular holes

21a, 21b is an even number, the length of the

rectangular holes

21a, 21b in the extending direction (Y direction) Are preferably substantially equal.

The length of one rectangular hole 21a in the short direction (Y direction) is substantially the same as the length of the other rectangular hole 21b in the short direction. In addition, the output wiring 30a and the output wiring 30b pass through the rectangular hole 21a in a state spaced from each other in the Y direction, and the output wiring 30c, the output wiring 30d, and the output wiring 30e are spaced from each other in the Y direction. Passes through the rectangular hole 21b.

In addition, the output wiring 30a having the highest potential and the output wiring 30e having the lowest potential are wider than the

output wirings

30b, 30c, and 30d having the potential between the

output wirings

30a and 30e. Has an area. In this way, by reducing the resistance of the highest potential output wiring 30a and the lowest potential output wiring 30e through which current flows normally, the power loss is reduced and the output during normal operation is increased. However, the cross-sectional areas of all output wirings electrically connected to the same terminal box may be the same. .

Hereinafter, with reference to FIG. 4 to FIG. 6, the superiority of the case where the back glass is provided with the rectangular holes compared to the case where the back glass is provided with the cylindrical through hole (round hole) will be described.

FIG. 4 is a diagram corresponding to FIG. 3 in the solar cell module 510 of the reference example, and is a diagram in which five identical circular holes 521 are provided on the same straight line extending in the Y direction on the back glass 503. FIG. 5 is a schematic cross-sectional view around the round hole 521 of the solar cell module 510. In FIG. 5, 501 indicates surface glass, 505a indicates a front side filler, and 505b indicates a back side filler.

When the back side protection member of the solar cell module is configured by the back glass, it is necessary to provide a through hole for allowing the output wiring to pass through the back glass. Therefore, there is a possibility that moisture passes from the outside through the through hole and enters the solar cell module, and the solar cells are deteriorated by the moisture. In addition, the possibility of such deterioration increases as the opening area of the through hole increases.

Therefore, it is better to reduce the opening area of the through hole. However, as shown in FIG. 4, the width in the width direction of the output wiring 530 is the dimension in the width direction (Y direction) of the output wiring 530 in each through hole. Required at a minimum. In addition, when the round holes 521 are provided in the back glass 503, the back glass 503 is easily broken when the distance between the holes is close. Therefore, the round holes 521 adjacent to each other in the Y direction need to be arranged apart by a predetermined distance or more. There is. Furthermore, in each through hole, the bending dimension a (see FIG. 5) of the output wiring 530 is required as a minimum in the extending direction (X direction) of the output wiring 530. Here, when the through hole is the round hole 521, the length b (see FIG. 5) in the X direction of the region where the output wiring 530 does not exist is increased, a useless space is increased, and moisture can pass through the through hole. Increases nature. In addition, when the round hole 521 is provided in the back glass 503, a through hole is generally formed by using a drill. However, the round hole 521 needs to be provided in a number corresponding to the number of the output wirings 530, and the manufacturing cost. Becomes higher.

On the other hand, as shown in FIG. 3, when the

rectangular holes

21a and 21b are provided in the back glass 3, compared with the case where the round holes 521 are provided in the back glass 503, the extending direction of the output wirings 30a to 30e (X (Direction) can be reduced, and useless space in the X direction can be reduced. Further, when the

rectangular holes

21a and 21b are provided in the back glass 3, the

rectangular holes

21a and 21b may be provided by laser processing or the like, which is smaller than the number of the output wirings 30a to 30e. Therefore, when the

rectangular holes

21a and 21b are provided in the back glass 3 as in the solar cell module 10 of the present embodiment, the opening area of the through holes provided in the back glass 3 can be reduced, and deterioration due to moisture intrusion can be suppressed. In addition, the manufacturing cost can be reduced.

FIG. 6 is a schematic diagram showing a comparison of manufacturing costs and opening areas in a plurality of through-hole patterns provided on the back glass.

As shown in FIG. 6, in the case of (a) to (e) in which a rectangular hole is provided on the back glass, as the number of rectangular holes increases as shown in (a), the area of the hole decreases, and Although it is easy to suppress the penetration | invasion of a water | moisture content, the cost for a process will become large. On the other hand, when the number of rectangular holes is reduced as shown in (e), the area of the holes is increased and it is difficult to suppress the intrusion of moisture from the rectangular holes, but the cost for processing can be reduced.

Next, with reference to FIG. 7, the superiority in the case of providing two rectangular holes in the back glass relative to the case of providing one rectangular hole in the back glass will be described.

When a rectangular hole is provided in the back glass, the aspect ratio (ratio of the rectangular dimension of the rectangular opening to the longitudinal dimension of the rectangular opening of the rectangular hole) is preferably as small as possible in order to suppress deterioration due to moisture intrusion. On the other hand, the smaller the aspect ratio, the more difficult the glass processing is and the more easily the finished product is broken.

Specifically, as shown in FIG. 7A, when the aspect ratio (opening area) of the rectangular hole 621 is large, deterioration due to moisture intrusion is likely to occur. On the other hand, as shown in FIG. 7B, when the aspect ratio of the rectangular hole 721 is reduced, the back glass is easily broken. On the other hand, if the rectangular hole is not the single hole but the two

holes

21a and 21b as in this embodiment shown in FIG. 7C, the opening area can be reduced compared to the case shown in FIG. The aspect ratio can be increased in comparison with the case shown in FIG. Therefore, deterioration due to moisture intrusion can be suppressed, and cracking of the back glass can also be suppressed.

Next, with reference to FIG. 8, the superiority of the case where two rectangular holes are provided in the back glass relative to the case where a plurality of round holes are provided in the back glass will be described.

∙ Available terminal boxes may differ depending on the installation area. Moreover, the pitch between the terminals in the terminal box is different for each type of terminal box. Therefore, when a plurality of round holes corresponding to the number of output terminals are provided on the back glass, the location of the back glass through which the output wiring passes is limited to a narrow range. It becomes impossible to correspond to. On the other hand, when one rectangular hole is provided in the back glass, the longitudinal dimension of the rectangular hole tends to be large, and the back glass is easily broken.

Specifically, the rear glass provided with five round holes 821 having a large adjacent interval c shown in FIG. 8A corresponds only to a terminal box having a large pitch in the Y direction. Further, the back glass provided with five round holes 921 shown in FIG. 8 (b) where the adjacent gap d is smaller than the case shown in FIG. 8 (a) is Y more than in the case shown in FIG. 8 (a). Only compatible with terminal boxes with small pitch in direction. That is, it is difficult to apply the terminal box corresponding to the round hole 921 shown in FIG. 8B as it is to the round hole 821 shown in FIG. Accordingly, the back glass provided with a plurality of round holes corresponding to a plurality of output wirings electrically connected to the same terminal box is limited in applicable terminal boxes and has low versatility. This leads to an increase in the types of terminal box designs, which increases the cost of the solar cell module.

On the other hand, in the case shown in FIG. 8C showing the present embodiment, the

rectangular holes

21a and 21b extending in the Y direction are provided in the back glass, and therefore, in FIGS. 8B and 8C. In comparison with the case shown, the degree of freedom in the Y direction of the portion through which the output wiring passes is significantly increased. And the back glass which has the

rectangular holes

21a and 21b shown in FIG.8 (c) respond | corresponds to the terminal box corresponding to the round hole 821 shown to Fig.8 (a), and the round hole 921 shown in FIG.8 (b). It can be applied to various terminal boxes including terminal boxes, improving versatility. Furthermore, in the case shown in FIG. 8C showing the present embodiment, since two

rectangular holes

21a and 21b are provided in the back glass, glass cracking of the back glass can also be suppressed. Therefore, glass breakage can be suppressed, and there is no need to prepare a separate back glass for each different terminal box, so that member costs can be reduced.

Further, in the case shown in FIG. 8C showing this embodiment, since the

rectangular holes

21a and 21b extending in the Y direction are provided in the back glass, the pitch setting in the Y direction of the plurality of output wirings is rectangular. It becomes difficult to be affected by the arrangement of the

holes

21a and 21b. This makes it easy to reduce the pitch in the Y direction of the plurality of output wirings, and it is also possible to reduce the terminal box provided to cover the

rectangular holes

21a and 21b.

Next, the output drop that can occur when the back glass is employed and the superiority of the above-described embodiment that has improved it will be described with reference to FIG. FIG. 9A shows that the front filler 1005a and the back filler 1005b are made of a material having the same degree of hardness and a material having the same degree of fluidity (reciprocal of viscosity) at the temperature at which the laminating process is performed. It is a schematic cross section which shows the state before the lamination process in the case of the performed reference example. Moreover, FIG.9 (b) is a schematic cross section which shows the state after the lamination process of the structure shown to Fig.9 (a), FIG.9 (c) respond | corresponds to FIG.9 (b) in this embodiment. It is a schematic cross section. In FIGS. 9A and 9B, reference numeral 1002 denotes a front glass, 1003 denotes a back glass, and 1030 denotes an output wiring.

When there is a wiring take-out hole, the filler receives a force in the direction of discharging from the through hole during laminating. In such a background, in the reference example shown in FIG. 9A, the transparent front filler 1005a and the white back filler 1005b are made of a material having the same degree of hardness or the same degree at the temperature at which the lamination process is performed. It is made of fluid material. Therefore, as shown in FIG. 9B, after lamination, the front filler 1005a may push away the back filler 1005b and erode into the rectangular holes 1021 due to the force in the direction of discharging from the rectangular holes 1021. . Then, the back filler 1005b may be discharged from a part of the rectangular hole 1021 to the outside. Then, the front filler 1005a penetrates a part of the rectangular hole 1021 in the depth direction, the filled portion of the front filler 1005a becomes transparent, and light leaks out of the rectangular hole 1021 from the transparent part and is output. May decrease, and the appearance may also decrease.

On the other hand, in the case of the present embodiment shown in FIG. 9C, the back filler 5b has higher hardness than the front filler 5a at the temperature at which the laminating process is performed, and from the front filler 5a. Satisfies at least one of low fluidity. Therefore, even if the back filler 5b receives a force from the front filler 5a to the outside of the rectangular hole 21a based on the force in the direction of discharging from the rectangular hole 21a generated during the lamination, the front filler 5a Penetration through the filler 5b is suppressed. Therefore, generation | occurrence | production of the location where the back filler 5b which can implement | achieve high reflection does not exist can be suppressed, and the fall of an output can be suppressed. Furthermore, since the occurrence of a portion where the back filler 5b does not exist is suppressed, the appearance is also good.

As described above, according to the solar cell module 10 having the above-described configuration, the

rectangular holes

21a and 21b provided in the back glass 3 extend in the thickness direction of the back glass 3 and are cut perpendicular to the thickness direction. The surface has a substantially rectangular shape. Therefore, the length in the direction perpendicular to the width direction of the output wirings 30a to 30e in the

rectangular holes

21a and 21b is compared with the length necessary for bending the output wirings 30a to 30e as compared with the case where a round hole is provided in the back glass. It becomes easy to set to the same length. Therefore, the gap between the

rectangular holes

21a and 21b provided in the back glass 3 and the output wirings 30a to 30e passing through the

rectangular holes

21a and 21b can be reduced, so that moisture does not easily pass through the

rectangular holes

21a and 21b. The module 10 is less likely to deteriorate due to moisture ingress.

It should be noted that the present disclosure is not limited to the above-described embodiment and modifications thereof, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

For example, in the above-described embodiment, the case where two

rectangular holes

21a and 21b are provided on the same straight line extending in the Y direction on the back glass 3 has been described. However, as shown in FIG. 6B, the back glass may be provided with three

rectangular holes

121a, 121b, and 121c that are positioned on the same straight line with an interval in the extending direction of the straight line. Moreover, the longitudinal direction of the rectangular opening of each

rectangular hole

121a, 121b, 121c may substantially coincide with the extending direction of the same straight line. Of the three

rectangular holes

121a, 121b, and 121c, the rectangular hole 121b located at the center of the extending direction is divided into three planes f1 that are perpendicularly divided into two including the direction orthogonal to the extending direction. The

rectangular holes

121a, 121b, and 121c may be disposed substantially plane-symmetrically. Further, the length in the extending direction of the rectangular hole 121b located at the center is longer than the length in the extending direction of the

rectangular holes

121a, 121c located at the ends in the extending direction among the three

rectangular holes

121a, 121b, 121c. May be longer. With such a configuration, the rectangular hole 121b may constitute the central through hole, or the

rectangular holes

121a and 121c may constitute the end through hole.

Or as shown in FIG.6 (c), you may provide three

rectangular holes

221a, 221b, and 221c located in the back surface glass at intervals in the extension direction of the straight line. Further, the longitudinal direction of the rectangular openings of the respective

rectangular holes

221a, 221b, 221c may substantially coincide with the extending direction of the same straight line. Of the three

rectangular holes

221a, 221b, and 221c, the rectangular hole 221b positioned at the center of the extending direction includes three planes f2 that are perpendicularly divided into two including the direction orthogonal to the extending direction. The

rectangular holes

221a, 221b, and 221c may be disposed substantially plane-symmetrically. Further, the length in the extending direction of the rectangular hole 221b located at the center is longer than the length in the extending direction of the

rectangular holes

221a, 221c located at the end in the extending direction among the three

rectangular holes

221a, 221b, 221c. May be shorter. With such a configuration, the rectangular hole 221b may constitute the central through hole, or the

rectangular holes

221a and 221c may constitute the end through hole.

Then,

rectangular holes

121a, 121b, 121c, 221a, 221b, and 221c as shown in FIGS. 6B and 6C are provided in the back glass to reduce the manufacturing cost and reduce the opening area. Good.

In addition, as shown in FIG. 10, that is, a schematic view of a part of the back glass 303 in the solar cell module 310 of the modification example when viewed from the back side, the back glass 303 may be provided with two

rectangular holes

321 a and 321 b. Good. Further, the extending direction of one rectangular hole 321a (longitudinal direction of the rectangular opening; Y direction) may substantially coincide with the extending direction of the other rectangular hole 321b. In addition, the dimension in the direction (X direction) orthogonal to the extending direction of one rectangular hole 321a may be shorter than the dimension in the direction orthogonal to the extending direction of the other rectangular hole 321b. Alternatively, the back glass member may be provided with only one through-hole that allows a plurality of output wirings that are electrically connected to the solar battery cell and electrically connected to the same terminal box to pass therethrough. And only the one through-hole may extend in the thickness direction of the back side glass member, and may have a substantially rectangular shape in a cut surface perpendicular to the thickness direction.

In addition, the case where the back filler 5b has at least one of having higher hardness than the front filler 5a and lower fluidity than the front filler 5a at the temperature at which the laminating process is performed will be described. did. However, in other configurations, exposure of the front filler to the back side of the back glass at the time of laminating may be suppressed.

For example, as shown in FIG. 11, an additional filler 406 is disposed between the back filler 405 b and the back glass 403 in a hole peripheral region overlapping the rectangular hole 421 when viewed from the thickness direction of the solar cell module. Alternatively, the additional filler 406 may be disposed between the back filler 405b and the rectangular hole 421. The additional filler 406 is made of, for example, a film or a filler, and is made of a material that is harder or less fluid than both the front filler 405a and the back filler 405b at the temperature at which the lamination process is performed. The As a material of the additional filler 406, a white and hard resin can be preferably used. For example, a polyethylene terephthalate resin can be preferably used, but is not limited thereto. In FIG. 11, reference numeral 402 denotes surface glass.

According to this modified example, as shown in FIG. 11, after the lamination process, the additional filler 406 can completely suppress the exposure of the front filler 405a to the back glass 403. Therefore, a decrease in output due to the provision of the rectangular hole can be prevented, and a deterioration in appearance does not occur.

In the case where the front filler and the back filler are provided, the back filler does not have a higher hardness than the front filler and has a lower fluidity than the front filler at the temperature at which the lamination process is performed. You do not have to. Alternatively, the sealing material may not include the front filler and the back filler, and may be configured with only one filler.

Moreover, as shown in FIG. 1, the case where the solar cell module 10 has the eight strings 50, and the back surface glass 3 has the two

rectangular holes

21a and 21b was demonstrated. However, the solar cell module may have any number of strings other than 8, and the back glass may have any number of rectangular holes of 3 or more. For example, the solar cell module may have six strings, and the back glass may have two rectangular holes.

Moreover, as shown in FIG. 1, the terminal box 60 was arrange | positioned in the X direction at intervals in the several photovoltaic cell 1, and demonstrated the case where it did not overlap with the several photovoltaic cell 1 when it sees from a Z direction. . However, the terminal box may be attached to the back side of the back glass so as to overlap a part of the plurality of solar cells when viewed from the thickness direction of the solar cell module. Moreover, although the case where the terminal box 60 exists only in the one side of the X direction of the some photovoltaic cell 1 was demonstrated, in the direction where a string extends, a terminal box is one side of several photovoltaic cells. It may be arranged on both sides of the other side.

As is clear from the above description, the solar cell module 10 includes a plurality of solar cells 1 and a surface glass 2 provided on the light receiving side on which light mainly enters the plurality of solar cells 1. May be. Moreover, the solar cell module 10 is provided with the back glass 3 which is provided in the opposite side to the light-receiving side with respect to the several photovoltaic cell 1, and is comprised with glass. In addition, the back glass 3 includes one or more

rectangular holes

21a and 21b that allow a plurality of output wirings 30a to 30e that are electrically connected to the solar cell 1 and electrically connected to the same terminal box 60 to pass therethrough. Is provided. The rectangular holes 21a and 21e extend in the thickness direction of the back glass 3, and have a substantially rectangular shape on a cut surface perpendicular to the thickness direction.

Also, the back glass 3 may be provided with a plurality of

rectangular holes

21a, 21b. The plurality of

rectangular holes

21a and 21b may include a rectangular hole 21a through which two or

more output wirings

30a and 30b pass, and may include a rectangular hole 21b through which two or more output wirings 30c to 30e pass. .

In addition, the plurality of

rectangular holes

21a and 21b are configured by two

rectangular holes

21a and 21b that are positioned on the same straight line with an interval in the extending direction of the straight line, and the length of the rectangular opening of each

rectangular hole

21a and 21b. The direction may substantially coincide with the extending direction of the same straight line.

Furthermore, in such a case, the length in the extending direction of one rectangular hole 21a may be 55% or more and 70% or less of the length in the extending direction of the other rectangular hole 21b.

In addition, the plurality of rectangular holes 121a to 121c are configured by three rectangular holes 121a to 121c that are positioned on the same straight line with an interval in the extending direction of the straight line, and the length of the rectangular opening of each rectangular hole 121a to 121c is The direction may substantially coincide with the extending direction of the same straight line. Then, among the three rectangular holes 121a to 121c, the three rectangular holes with respect to the plane f1 that bisects the rectangular hole 121b located at the center in the extending direction, including the direction orthogonal to the extending direction, vertically. 121a to 121c may be arranged substantially symmetrically. The length in the extending direction of the rectangular hole 121b located at the center in the extending direction is the same as the extending direction of the

rectangular holes

121a and 121c positioned at the ends in the extending direction among the three rectangular holes 121a to 121c. It may be longer than the length.

In addition, the plurality of rectangular holes 221a to 221c are configured by three rectangular holes 221a to 221c that are positioned on the same straight line with an interval in the extending direction of the straight line, and the length of the rectangular opening of each rectangular hole 221a to 221c The direction may substantially coincide with the extending direction of the same straight line. Of the three rectangular holes 221a to 221c, the three rectangular holes with respect to the plane f2 that bisects the rectangular hole 221b positioned at the center of the extending direction, including the direction orthogonal to the extending direction, into two parts. 221a to 221c may be disposed substantially symmetrically. The length in the extending direction of the rectangular hole 221b located at the center in the extending direction is the same as the extending direction of the

rectangular holes

221a and 221c positioned at the ends in the extending direction among the three rectangular holes 221a to 221c. It may be shorter than the length.

Further, the length in the short direction of the rectangular openings of the

rectangular holes

21a and 21b provided in the back glass 3 is 5% or more and 30% or less of the length in the longitudinal direction of the rectangular openings of the

rectangular holes

21a and 21b. It's okay.

Further, a sealing material 5 that is provided between the front glass 2 and the back glass 3 and seals the plurality of solar cells 1 may be provided. And the sealing material 5 may contain the front filler 5a provided in the surface glass 2 side, and the back filler 5b provided in the back glass 3 side of the front filler 5a. Then, at least one of the back filler 5b having a hardness higher than that of the front filler 5a and a fluidity lower than that of the front filler 5a at the temperature at which the lamination is performed may be satisfied.

Alternatively, a sealing material that is provided between the front glass and the rear glass and seals a plurality of solar cells may be provided. The sealing material may include a front filler 405a provided on the front glass side, a back filler 405b provided on the back glass 403 side of the front filler 405a, and an additional filler 406. Further, the additional filler 406 may be provided between the back filler 405b and the plurality of rectangular holes 421. In addition, the additional filler 406 has a higher hardness than the front filler 405a and the back filler 405b, and the additional filler 406 has a lower fluidity than the front filler and the back filler at the temperature at which the lamination process is performed. At least one of the following may be satisfied.

1 solar cell, 2, 402, surface glass, 3, 303, 403, back glass, 5 sealing material, 5a, 405a, front filler, 5b, 405b, back filler, 10, 310, solar cell module, 21a, 21b, 121a , 121b, 121c, 221a, 221b, 221c, 321a, 321b, 421 rectangular hole, 30a, 30b, 30c, 30d, 30e output wiring, 60 terminal box, 406 additional filler, f1, f2 extending through the central through hole A plane that bisects vertically, including a direction perpendicular to.

Claims

A plurality of solar cells,
A translucent front side member provided on the light receiving side on which light is mainly incident on the plurality of solar cells;
A back side glass member that is provided on the opposite side of the light receiving side with respect to the plurality of solar cells and is made of glass,
The back glass member is provided with one or more through-holes that allow a plurality of output wirings that are electrically connected to the solar cells and electrically connected to the same terminal box to pass therethrough,
The said through-hole is a solar cell module extended in the thickness direction of the said back side glass member, and having a substantially rectangular shape in the cut surface perpendicular | vertical to the said thickness direction.
The solar cell module according to claim 1, wherein
The back glass member is provided with a plurality of the through holes,
The solar cell module, wherein the plurality of through holes include the through holes through which two or more of the output wirings pass.
In the solar cell module according to claim 2,
The plurality of through holes are composed of two through holes that are positioned on the same straight line with an interval in the extending direction of the straight line,
The solar cell module in which the longitudinal direction of the rectangular opening of each through hole substantially coincides with the extending direction.
In the solar cell module according to claim 3,
The length in the extending direction of one of the through holes is a solar cell module that is not less than 55% and not more than 70% of the length in the extending direction of the other through hole.
In the solar cell module according to claim 2,
The plurality of through-holes are configured by three through-holes positioned on the same straight line at intervals in the extending direction of the straight line,
The longitudinal direction of the rectangular opening of each through hole substantially coincides with the extending direction,
Of the three through-holes, the three through-holes are substantially parallel to a plane that bisects the central through-hole located at the center of the extending direction, including the direction orthogonal to the extending direction. Arranged symmetrically,
The length of the central through hole in the extending direction is longer or shorter than the length in the extending direction of an end through hole located at the end of the extending direction among the three through holes. module.
In the solar cell module according to any one of claims 1 to 5,
The length in the short direction of the rectangular opening of each through hole is a length of 5% to 30% of the length of the through hole in the longitudinal direction of the rectangular opening.
In the solar cell module according to any one of claims 1 to 6,
Provided between the translucent front side member and the back side glass member, comprising a sealing material for sealing the plurality of solar cells,
The sealing material is
A front filler provided on the translucent front side member side;
At least one of having higher hardness than the front filler and lower fluidity than the front filler at a temperature at which the front side filler is provided on the back glass member side and laminating is performed. And a back filler that is filled with a solar cell module.
In the solar cell module according to any one of claims 1 to 6,
Provided between the translucent front side member and the back side glass member, comprising a sealing material for sealing the plurality of solar cells,
The sealing material is
A front filler provided on the translucent front side member side;
A back filler provided on the back glass member side of the front filler;
It is provided between the back filler and the plurality of through holes, and has a higher hardness than the front filler and the back filler at a temperature at which laminating is performed, and the front filler and the An additional filler that is filled with at least one of having lower fluidity than the back filler.