CN102208469A - Solar cell module - Google Patents

Abstract

The present invention provides a solar battery module comprising: a solar battery panel configured to include a plurality of solar battery cells formed in a plate shape and arranged on the same plane, and to cover the plurality of solar battery cells arranged on the same plane. A cell protection member formed in a plate shape, a surface protection member bonded to the surface of the cell protection member, and a back plate bonded to the back side of the cell protection member; and an outer frame holding the outer periphery of the solar cell panel wherein, the thickness of the back panel is determined such that, when the solar cell panel is bent and deformed by an external force on the surface of the panel, the unit is close to an oblique neutral axis in the thickness direction of the panel.

Description

solar cell module

This application is a divisional application of the same applicant's Chinese invention patent application with the application date of April 24, 2007, application number 200780052703.7 (PCT/JP2007/058852), and the invention name "solar battery module".

technical field

The present invention relates to a solar cell module, and more particularly to a support structure for a solar cell panel included in the solar cell module.

Background technique

In a conventional solar battery module, a plurality of solar battery cells formed in a plate shape and arranged on the same plane are covered with a flexible resin cell protection member such as EVA (ethylene-vinyl acetate copolymer). A surface protection member such as tempered glass is bonded to the surface of the cell protection member to ensure structural strength as a building member.

As a solar cell module whose strength is further improved compared with the above-mentioned conventional solar cell module, there is a solar cell panel, a heat insulator arranged on the back thereof, and a metal plate arranged on the back side of the solar cell are laminated with an adhesive layer interposed therebetween. An integrated solar cell module (for example, refer to Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 09-119202 (page 4, FIG. 1 )

However, any of the above-mentioned conventional solar cell modules has a problem in that the power generation efficiency of the solar cell module after it is installed outdoors such as on the roof of a house is lower than the power generation efficiency before installation.

Contents of the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable solar cell module that does not lower power generation efficiency when installed outdoors.

In order to solve the above-mentioned problems and achieve the purpose, the present invention provides a solar cell module characterized by comprising: a solar cell panel configured to include a plurality of solar cell cells formed in a plate shape and arranged on the same plane to cover The plurality of solar battery cells arranged on the same surface are formed in the form of a plate-shaped cell protection member, and a surface protection member bonded to the surface of the cell protection member; an outer frame that holds the outer periphery of the solar battery panel and beams, both ends of which are respectively connected to two opposing positions of the outer frame to support the central portion of the back side of the solar cell panel, wherein an initial tension is applied to the beams.

In addition, the present invention provides a solar battery module characterized by comprising: a solar battery panel configured to include a plurality of solar battery cells formed in a plate shape and arranged on the same plane so as to cover the solar battery cells arranged on the same plane. A plurality of solar battery cells are formed in the form of a plate-shaped unit protection member, a surface protection member bonded to the surface of the cell protection member, and a back plate bonded to the back side of the above-mentioned cell protection member; and an outer frame, holding In the outer peripheral portion of the solar cell panel, the modulus of elasticity of the surface protection member is E ₁ , the thickness is t ₁ , the modulus of elasticity of the back plate is E ₂ , and the thickness of the cell protection member is t ₃ , the thickness _t2 of the above-mentioned back plate is set to be more than the thickness t _A calculated according to the formula (1) and not more than the thickness t _B calculated according to the formula (2),

Formula 1)

${\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Formula (2)

${\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

According to the present invention, there is an effect of obtaining a highly reliable solar cell module that does not lower power generation efficiency even after it is installed outdoors.

Description of drawings

FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the solar cell module of the present invention.

FIG. 2 is a bottom view of the solar cell module according to Embodiment 1. FIG.

3 is a plan view of a solar cell panel included in the solar cell module according to Embodiment 1. FIG.

Fig. 4 is a partial bottom view showing the junction of the outer frame and beams of the solar cell module according to the first embodiment.

FIG. 5 is a perspective view showing a support stand of the solar cell module according to Embodiment 1. FIG.

6 is a partial longitudinal sectional view of a solar cell panel included in the solar cell module according to Embodiment 1. FIG.

7 is a longitudinal sectional view showing Embodiments 2 and 3 of the solar cell module of the present invention.

8 is a partial vertical cross-sectional view of a solar cell panel included in a solar cell module according to Embodiment 2. FIG.

FIG. 9 is a diagram illustrating a state of deformation occurring in a conventional solar cell panel.

10 is a partial longitudinal sectional view of a solar cell panel included in a solar cell module according to Embodiment 3 of the present invention.

(Explanation of labels)

1, 21, 31 solar panels

2 solar cells

3 surface protection parts

4 unit protection parts

5, 25, 35 solar cell modules

6 beams

6a screw

6b end face

7 outer frame

7a Corner

7b oblique piece

7c Inner end face

7e slot

8 support table

8a Support block

8b cross slot

8c support plate

9 initial clearance

10 nuts

12 Central part of the solar panel

14 Back panel (sandwich panel)

15 Occurrence distribution of deformation

16 neutral axis

18 skin board

19 core pieces

Detailed ways

Hereinafter, embodiments of the solar cell module of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to this embodiment.

Embodiment 1

1 is a longitudinal sectional view showing Embodiment 1 of a solar cell module according to the present invention, FIG. 2 is a bottom view of the solar cell module according to Embodiment 1, and FIG. 3 is a solar cell panel included in the solar cell module according to Embodiment 1. Fig. 4 is a partial bottom view showing the junction of the outer frame and the beam of the solar cell module in Embodiment 1, Fig. 5 is a perspective view showing the support platform of the solar cell module in Embodiment 1, Fig. 6 is A partial longitudinal sectional view of a solar cell panel included in the solar cell module according to the first embodiment.

As shown in FIGS. 1 to 5 , a solar cell module 5 according to Embodiment 1 includes a rectangular plate in which a plurality (12 in Embodiment 1) of rectangular plate-shaped solar cells 2 are arranged at intervals on the same surface. shaped solar cell panel 1; an aluminum alloy rectangular frame-shaped outer frame 7 that is held by inserting the outer peripheral portion of the solar cell panel 1 into the groove 7e; and the outer frame 7 arranged on the back side of the solar cell panel 1 Two high-tensile steel beams 6, 6 are connected to the oblique pieces 7b of the corners 7a of the outer frame 7 on two diagonal lines.

The two beams 6 , 6 intersect at the outer frame 7 and the central portion 12 of the solar cell panel 1 . A support stand 8 made of aluminum alloy is provided at the intersection of the beams 6 and 6 , and the central portion 12 on the rear side of the solar cell panel 1 is supported by a rectangular support plate 8 c of the support stand 8 .

As shown in FIG. 6, the solar battery unit 2 (only one is shown in FIG. 6, but 12 solar battery units 2 are arranged at intervals on the same surface) is coated with EVA (ethylene-vinyl acetate copolymer) for example. The unit protection member 4 made of flexible resin is covered. The surface protection member 3 is adhered to the surface of the plate-shaped cell protection member 4 formed to cover the 12 solar battery cells 2 .

The surface protection member 3 is tempered glass with a thickness of 2 to 4 mm. The solar battery unit 2 is made of crystalline silicon with a thickness of 0.1-0.4 mm. In addition, the cell protection member 4 includes the solar cell 2 and has a thickness of 0.3 to 1 mm.

In conventional solar cell modules, bending loads are applied during transportation, bending loads are applied by people standing on the solar cell panels during installation on the roof of a house, and surface pressure due to strong winds is received after installation. When a large external force (bending load) is applied to the solar cell panel, the solar cell panel is deformed, and cracks may occur in the internally sealed solar cell 2 . In addition, when the solar cell panel receives the above-mentioned external force exceeding the allowable value, cracks generated in the solar cell 2 become a cause, and power generation efficiency decreases.

In the solar cell module 5 according to the first embodiment, in order to prevent the solar cell panel 1 from being deformed and cracked, the central portion of the back side of the solar cell panel 1 is supported by the beams 6 , 6 and the support base 8 .

Arranged on two diagonal lines of the outer frame 7 holding the outer peripheral portion of the solar cell panel 1, and the two ends are connected to the oblique members 7b, 7b of the two opposite corners 7a, 7a of the outer frame 7, respectively. The two beams 6, 6 cross at the central portion 12 of the outer frame 7. The central part of the back side of the solar cell panel 1 is supported by a rectangular support plate 8c of a support stand 8 made of aluminum alloy provided at the intersection.

Even if a bending load is applied to the solar cell panel 1, since the central portion on the back side of the solar cell panel 1 is supported by the beams 6, 6, the bending deformation of the solar cell panel 1 is suppressed. Even if loads during transportation, loads during installation, and loads due to wind after installation are applied to the solar battery module 5 , cracks hardly occur in the solar battery cells 2 .

Therefore, it is possible to prevent the reduction in power generation efficiency after installation of the solar battery module 5 and to improve reliability. In addition, since the beams 6 and 6 are rod-shaped, the rigidity of the solar cell panel 1 is increased without covering the rear surface of the solar cell panel 1 , and heat dissipation from the rear surface of the solar cell panel 1 is maintained. Therefore, the phenomenon that the temperature of the solar cell 2 rises and the power generation efficiency decreases does not occur.

As shown in FIG. 4 , screws 6 a are formed at both ends of the bar-shaped beam 6 . At corners 7a of the outer frame 7, inclined pieces 7b are fixed. The screw 6a is inserted into the hole of the inclined piece 7b, and the two ends of the beam 6 are respectively connected to two opposite corners 7a, 7a of the outer frame 7 through nuts 10, 10 screwed into the screw 6a.

An initial gap 9 is provided between the end surface 6b of the portion of the beam 6 where the screw 6a is not formed and the inner end surface 7c of the slope 7b. By tightening the nuts 10 , 10 , an initial tension T can be given to the beam 6 . If an initial tension T is applied to the beam 6, when the solar cell panel 1 is bent and deformed, in addition to the normal restoring force against the bending of the beam, the length of the beam 6 is set to L, and the bending deformation displacement is set to The restoring force F represented by the formula F=2Tx/L acts when x is x.

The beam 6 to which the initial tension T is applied has a greater restoring force than the beam 6 to which the initial tension T is not applied, and the rigidity of the beams 6 and 6 against bending deformation of the solar cell panel 1 can be increased. In addition, compared with the case where no initial tension is applied, the beams 6, 6 can be further reduced in size, and the mass of the beams 6, 6 can also be reduced.

In addition, the beam 6 can also be divided into two and connected with a turnbuckle, and the initial tension T is applied to the beam 6 through the turnbuckle. The beam 6 is not only connected to the outer frame 7 holding the solar battery panel 1, but also serves as a frame structure (not shown) for attaching the outer frame 7 to an installation location.

As shown in Figure 5, the supporting platform 8 arranged at the intersection of the beams 6, 6 includes: a supporting block 8a provided with an intersecting groove 8b fitted with the intersecting beams 6, 6; and a solar cell fixed on the supporting block 8a On the surface on the panel 1 side, a support plate 8c is formed such that its outer peripheral portions are located on the outer peripheral portions of the two solar battery cells 2, 2 arranged in the center.

When the support plate 8c is formed as described above, as shown in FIG. 2 and FIG. gap, so the rupture of the solar battery unit 2 can be prevented. In Embodiment 1, the outer peripheral portion of the support plate 8c is positioned on the outer peripheral portion of the two solar battery cells 2,2, but it is only necessary to position the outer peripheral portion of the support plate 8c in the gap between the solar battery cells 2,2. The size of 8c may be the size of one solar cell 2 or the size of a plurality of them.

In addition, in Embodiment 1, the surface protection member 3 is made of tempered glass, but the surface protection member 3 may be made of a transparent resin as long as it is a member through which light passes. In addition, two beams 6 are arranged on a diagonal line of the solar cell panel 1 , but the present invention is not limited thereto, and may be arranged so as to straddle the central portion of the solar cell panel 1 .

Embodiment 2

7 is a longitudinal sectional view showing Embodiments 2 and 3 of the solar cell module of the present invention, and FIG. 8 is a partial longitudinal sectional view of a solar cell panel included in the solar cell module of the second embodiment.

As shown in FIGS. 7 and 8 , a solar cell module 25 according to Embodiment 2 includes: a rectangular plate-shaped solar cell panel 21 in which a plurality of solar cell cells 2 are arranged; The rectangular frame-shaped outer frame 7 made of aluminum alloy held in the center.

In addition, as shown in FIG. 8, in the solar battery panel 21, the solar battery unit 2 (only one is shown in FIG. 8, but a plurality of solar battery units 2 are arranged at intervals on the same surface) is formed like EVA. The cell protection member 4 made of such a flexible resin is covered, and the surface protection member 3 made of plate-shaped tempered glass is bonded to the surface of the plate-shaped cell protection member 4 . Furthermore, the back plate 14 is bonded to the back surface of the cell protection member 4 of the solar battery panel 21 .

In a conventional solar cell module, the fracture curvature of a solar cell cell is much larger than that of tempered glass as a surface protection member, and since the solar cell and the surface protection member are bonded, deformation until the fracture curvature does not occur. Nevertheless, the reason why cracks occur in solar battery cells when they are subjected to loads during transport, load during installation, or wind is as follows.

FIG. 9 is a diagram showing a state of deformation occurring in a solar cell panel when a conventional solar cell panel is bent and deformed by a load during transportation, a load during installation, or a load of wind. The dotted line 15 in FIG. 9 represents the distribution of the compressive deformation and the tensile deformation from the neutral axis 16 of the solar cell panel to the surface layer.

As shown in FIG. 9 , when a conventional solar cell panel is subjected to a large surface pressure from above to below in FIG. 9 due to wind during transportation, installation, or after installation, it bends downward. The solar cell panel is a panel in which the surface protection member 3 and the cell protection member 4 are bonded together, but since the adhesive layer 4a does not easily slip, it is bent and deformed like an integral member.

Regarding the deformation of the solar cell panel, when the deformation of the neutral axis 16 is set to 0, it increases linearly as it moves away from the neutral axis 16 upwards or downwards. Above the neutral axis 16, compressive deformation occurs as indicated by the dotted arrow in FIG. 9 , and tensile deformation occurs below it as indicated by the solid arrow.

In the conventional solar cell panel, since the solar cell 2 made of crystalline silicon with a thickness of 0.1 to 0.4 mm is bonded to the surface protection member 3 made of tempered glass with a thickness of 2 to 4 mm, the solar cell 2 is arranged at a distance from the neutral axis 16 downward. In the solar battery cell 2 of , large tensile deformation occurred. As a result, cracks occurred in the solar battery cell 2 although the failure curvature of the solar battery cell 2 alone was not reached.

As shown in FIG. 8 , in the solar cell panel 21 according to Embodiment 2, the rear surface plate 14 having a predetermined thickness is adhered to the back surface of the cell protection member 4 so that the solar cell 2 is brought closer to the neutral axis, thereby reducing the tension generated in the solar cell 2 . elongation deformation, and inhibit cracking.

Therefore, even if the solar battery module 25 is loaded by the wind pressure after transportation, installation, and installation, cracks in the solar battery cells 2 can be reduced, and the power generation efficiency of the solar battery module 25 after installation can be prevented from being lowered.

In particular, when the neutral axis 16 (not shown in FIG. 8 ) is positioned within the thickness of the cell protection member 4, the deformation that occurs in the solar battery cell 2 becomes small, so even if a large force is applied to the solar battery panel 21, The bending load can also prevent damage caused by cracks in the solar cell 2 .

In order to position the neutral axis 16 within the range of the thickness of the unit protection member 4, the elastic modulus of the surface protection member 3 may be E ₁ , the plate thickness may be t ₁ , the elastic modulus of the back plate 14 may be E ₂ , Assuming that the plate thickness is t ₂ and the thickness of the cell protection member 4 around the solar battery cell 2 is t ₃ , using the formula (Mechanical Science のためのMaterial Mechanics, Yang According to the thickness t _A calculated by the formula (1) derived by Xian Tang, 2001, page 179) and the thickness t _B calculated by the formula (2), the thickness t ₂ of the back panel 14 is set to be not less than t _A and not more than t _B (t _A ≤ t ₂ ≤ t _B ).

Formula 1)

${\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Formula (2)

${\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>\sqrt{\frac{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

As described above, in the solar cell module 25 according to the second embodiment, the back sheet 14 is bonded to the back surface of the cell protection member 4 of the solar cell panel 21, and the thickness _t2 of the back sheet 14 is determined based on the elastic modulus _E1 of the surface protection member 3. , thickness t ₁ , elastic modulus E ₂ of the back panel 14, and thickness t ₃ of the unit protection member 4 are equal to or greater than the thickness t _A calculated by the formula (1) and are equal to or less than the thickness t _B calculated by the formula (2). The occurrence of cracks in the solar cell 2 can be greatly reduced, and the reduction in power generation efficiency after the installation of the solar cell module 25 can be prevented, thereby improving reliability.

In addition, since the bending deformation up to the failure curvature of the solar battery unit 2 is allowed, and the rigidity of the surface protection member 3 can be reduced compared with the case where the back plate 14 is not provided, the thickness of the surface protection member 3 can be reduced. The quality of the solar cell panel 21 is reduced.

In addition, if a metal with high thermal conductivity such as steel is used as the back plate 14, the amount of heat radiation from the back surface of the solar cell panel 21 increases, the temperature rise of the solar cell 2 can be suppressed, and the power generation of the solar cell module 25 can be improved. efficiency.

Embodiment 3

10 is a partial longitudinal sectional view of a solar cell panel included in a solar cell module according to Embodiment 3 of the present invention.

As shown in FIG. 10, in the solar cell panel 31 of Embodiment 3, the solar cell 2 is covered with a flexible cell protection member 4, the surface protection member 3 is bonded to the surface, and the rear surface is used as the back plate 14. A sandwich-structured panel (sandwich-structured panel) 14 in which both sides of a plate-like core 19 are sandwiched by an outer skin plate 18 is bonded. In addition, the structure of the solar cell module 35 of Embodiment 3 is the same as that of the solar cell module 25 shown in FIG. 7 .

The sandwich panel 14 represented by a honeycomb panel has very large bending rigidity, and is bonded on the back side of the solar cell panel 31 as a back panel 14, thereby preventing damage caused by bending deformation of the solar cell unit 2. damaged.

Especially when the neutral axis 16 (not shown in FIG. 10 ) is located within the range of the thickness of the cell protection member 4, the tensile deformation that occurs in the solar battery cell 2 becomes small, and the larger bending of the solar battery panel 31 Deformation can also prevent damage to the solar cell 2 and improve the reliability of the solar cell module 35 (see FIG. 7 ).

In the case of using the sandwich panel 14, since the sandwich panel 14 is a composite material, the formula (1) and formula ( 2).

In the case of using the three-layer sandwich panel 14 shown in FIG. 10 , in order to position the neutral axis 16 within the range of the thickness of the unit protection member 4, the thickness of the outer skin plate 18 is t _2a , and the modulus of elasticity is t 2a . E _2a , the thickness of the core member 19 is set as t _2b , the thickness t ₂ of the sandwich panel 14 is set as the value calculated according to formula (3), the elastic modulus E ₂ is set as the value calculated according to formula (4), and The thickness _t2 of the sandwich panel 14 calculated by the formula (3) is set to be more than the thickness t _A calculated by the formula (1) and not more than the thickness t _B calculated by the formula (2) (t _A ≤ t ₂ ≤ t _B ), namely Can.

Formula (3)

t ₂ =2t _2a +t _2b (3)

Formula (4)

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; a</span>}}\frac{{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; a</span>}}}{{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

As described above, in the solar cell module 35 according to Embodiment 3, as the back panel 14 adhered to the back surface of the cell protection member 4, a sandwich panel is used in which both sides of the core member 19 are sandwiched by the outer skin sheet 18, and the formula ( 3) Calculate the thickness t ₂ of the sandwich panel 14, calculate the elastic modulus E ₂ by the formula (4), set the thickness t ₂ of the sandwich panel 14 to be more than the thickness t _A calculated according to the formula (1) and according to the formula (2 ) is less than the calculated thickness t _B , so the occurrence of cracks in the solar battery unit 2 can be greatly reduced, the power generation efficiency of the solar battery module 35 after installation can be prevented from being reduced, and the reliability can be improved.

In addition, in Embodiment 3, since the sandwich panel is used as the back panel 14, the mass of the solar cell module 35 can also be reduced. Furthermore, when a metal honeycomb such as aluminum is used as the core member 19, compared with the case of using a heat insulator, the thermal conductivity is better, the temperature rise of the solar cell 2 can be suppressed, and the power generation efficiency of the solar cell module 35 can be improved.

In addition, if metal such as aluminum is used as the outer skin plate 18 , thermal conductivity is good, the temperature rise of the solar cell 2 can be suppressed, and the power generation efficiency of the solar cell module 35 can be improved. In addition, FRP (Fiber Reinforced Plastics, fiber reinforced plastics) may also be used as the outer skin panel 18. Compared with the case of using metal such as aluminum, the mass of solar cell panel 31 can be reduced.

Industrial availability

As described above, the solar cell module of the present invention is useful as a solar cell module that is highly resistant to loads during transportation, installation, and strong wind.

Claims (3)

1. solar module is characterized in that possessing:

Solar battery panel constitutes to possess and forms at grade a plurality of solar battery cells of tabular and configuration, forms tabular cell protection parts, is bonded in the lip-deep surface protection parts of these cell protection parts and is bonded in the backplate at the back side of said units guard block to cover above-mentioned being configured in the form of a plurality of solar battery cells on the one side; And

Outside framework keeps the peripheral part of above-mentioned solar battery panel,

Wherein, the thickness of described backplate is confirmed as, at above-mentioned solar battery panel because the face of panel is subjected to external force flexural deformation situation under, said units is near the oblique neutral axis of the thickness direction of described panel.

2. solar module according to claim 1 is characterized in that,

Described backplate is a metal;

The spring rate of above-mentioned surface protection parts is made as E ₁, thickness is made as t ₁, the spring rate of above-mentioned backplate is made as E ₂, the thickness of said units guard block is made as t ₃,

Thickness t with above-mentioned backplate ₂Be made as the thickness t of calculating according to formula (1) _AMore than and the thickness t calculated according to formula (2) _BBelow,

Formula (1)

$t_A=\sqrt{\frac{E_1}{E_2}{t_1}^2+{t_3}^2}-t_3---\left(1\right)$

Formula (2)

$t_B=\sqrt{\frac{E_1}{E_2}{t}_1(t_1+2t_3)}---\left(2\right).$

3. solar module according to claim 1 is characterized in that, above-mentioned backplate is made as with two crust plate holders the sandwich panel on the two sides of chipware,

The spring rate of above-mentioned outer dermatotome is made as E _2a, thickness is made as t _2a, the spring rate of above-mentioned chipware is made as E _2b, thickness is made as t _2b,

Thickness t with above-mentioned sandwich panel ₂Be made as the value of calculating according to formula (3), with the spring rate E of above-mentioned sandwich panel ₂Be made as the value of calculating according to formula (4),

Formula (3)

t ₂＝2t _2a+t _2b (3)

Formula (4)

$E_2=E_{2a}\frac{{2t}_{2a}}{{2t}_{2a}+t_{2b}}---\left(4\right).$

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