JP2017017060A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which inhibits influences of temperature change.SOLUTION: A solar cell module 100 includes: a light condensing optical system 110 which condenses sun light; photoelectric conversion units 130 which receive emission light from the light condensing optical system 110; and a support frame (a side surface 120a, a bottom surface 120b) supporting the light condensing optical system 110 and a heat sink 140. The support frame bottom surface 120b has through holes 121. A lead frame forming each photoelectric conversion unit 130 is disposed in the through hole 121. The photoelectric conversion unit 130 is in contact with the heat sink 140 through a contact part lead frame 131a of the photoelectric conversion unit 130 and heat radiation grease 141.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a solar cell module that collects sunlight using a condensing lens.

  Patent document 1 discloses the solar cell by which the heat sink is arrange | positioned at the back surface of the solar cell element. This solar cell includes a concentrating solar cell element that photoelectrically converts sunlight that is collected and irradiated and generates power, and a receiver substrate on which the solar cell element is mounted. The receiver substrate includes a base base, an intermediate insulating layer stacked on the base base, a connection pattern layer stacked on the intermediate insulating layer, and a surface protective layer for protecting the connection pattern layer. Thereby, heat dissipation and productivity are good and high power generation efficiency can be obtained.

JP 2008-91440 A

  The present disclosure provides a solar cell module in which the influence of temperature change is suppressed.

  A solar cell module in the present disclosure includes a light collecting member that collects sunlight, a photoelectric conversion element that receives light emitted from the light collecting member, a lead frame that supports the photoelectric conversion element, and a through hole. And a support frame that supports the optical member, and the lead frame is disposed in the through hole.

  The solar cell module in the present disclosure is effective for suppressing the influence of temperature change.

Sectional drawing which shows the structure of the solar cell module in Embodiment 1 FIG. 3 is a perspective view illustrating a configuration of a photoelectric conversion unit in Embodiment 1. Sectional drawing which expanded a part of support frame in Embodiment 1 The perspective view for demonstrating the connection state of the photoelectric conversion unit in Embodiment 1 Sectional drawing which expanded a part of 2nd optical system and support frame in Embodiment 2 The perspective view for demonstrating the 2nd optical system in Embodiment 2. FIG. Sectional drawing which shows the structure of the solar cell module in Embodiment 3 The perspective view which shows the structure of the solar cell module in Embodiment 3. FIG.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, Embodiment 1 will be described with reference to FIGS.

[1-1. Constitution]
[1-1-1. overall structure]
FIG. 1 is a schematic diagram illustrating a solar cell module 100 according to the first embodiment.

  The solar cell module 100 mainly includes a condensing optical system 110, a support frame 120, a photoelectric conversion unit 130, wiring wires 136, and a heat dissipation plate 140. A plurality of solar cell modules 100 are arranged side by side on a tracking device (not shown) that tracks the sunlight so that it is incident on the condensing optical system 110 vertically.

  The condensing optical system 110 includes a plurality of condensing lenses 111 arranged in an array. The condenser lens 111 is made of a resin material such as PMMA (polymethyl methacrylate) having a thickness of about 2 mm. The condensing lenses 111 may be integrated or separate. In the condensing optical system 110, the incident surface of sunlight has a flat surface, and the outgoing surface of sunlight has a Fresnel surface.

  The support frame 120 includes a side wall 120 a that supports the condensing optical system 110 and a bottom surface 120 b that is substantially parallel to the condensing optical system 110. The support frame 120 is made of PMMA, which is the same material as the condensing optical system 110. In addition, through holes 121 are formed on the bottom surface 120 b of the support frame 120 at positions corresponding to the individual condenser lenses 111. A photoelectric conversion unit 130 is inserted into each of the through holes 121, and the photoelectric conversion units 130 are electrically connected in series or in parallel by wiring wires 136. The support frame 120 is attached with a heat sink 140 and screws 150. The photoelectric conversion unit 130 and the heat radiating plate 140 are in contact with the contact portion 131 a of the photoelectric conversion unit 130 via the heat radiating grease 141. The heat dissipating grease 141 includes alumina or the like, and has lower rigidity than the support frame 120 and the heat dissipating plate 140. That is, when the photoelectric conversion unit 130 is not fixed to the heat sink 140 and the expansion coefficients of the bottom surface 120b and the heat sink 140 are different, even if they are deformed due to a temperature change or the like, only the deformation in the X-axis direction is performed. No deflection deformation in the Z-axis direction occurs.

  Here, the screw 150 is attached to the heat radiating plate 140 through the screw hole 122, but the inner diameter of the screw hole 122 is larger than the diameter of the screw 150 in consideration of the difference in coefficient of linear expansion between the support frame 120 and the heat radiating plate 140. Designed. Moreover, the heat sink 140 and the support frame 120 are not fixed. That is, even if the screws 150 change the dimensions of the heat sink 140 and the support frame 120 due to the temperature change of the solar cell module 100, the support frame 120 having a large linear expansion coefficient is laterally displaced in the X-axis direction in FIG. I support it so that I can do it. Further, even if the lateral displacement of the support frame 120 due to the temperature difference occurs, the contact portion 131a of the photoelectric conversion unit 130 and the heat radiating plate 140 can be kept in contact via the heat radiating grease 141.

Further, a sealing portion 160 is applied between the support frame 120 and the heat radiating plate 140 along the periphery of the support frame 120 and the heat radiating plate 140 in order to prevent moisture from entering the solar cell module 100. Similarly, the sealing portion 161 is also applied to the exposed portion of the screw 150 that penetrates the heat radiating plate 140. The sealing portions 160 and 161 are shear-deformed in the X-axis and Y-axis directions when a lateral shift occurs due to expansion or contraction of the support frame 120 in the X- and Y-axis directions due to temperature changes. However, the solar cell module 100 is not stressed. Therefore, the sealing parts 160 and 161 can use butyl rubber that can be elastically deformed.
[1-1-2. Configuration of photoelectric conversion unit]
FIG. 2 is a schematic diagram showing the photoelectric conversion unit 130. The photoelectric conversion unit 130 includes a lead frame 131, a ceramic substrate 132, an electrode 133, and a photoelectric conversion element 134.

  The lead frame 131 includes a spring portion 131b on a side surface thereof and a spring portion 131c on a side surface perpendicular to the spring portion 131b. Although details will be described later, when the lead frame 131 is inserted into the through hole 121, the spring portions 131 b and 131 c abut against the side surface of the through hole 121. As the lead frame 131, phosphor bronze having good thermal conductivity and nickel plating is used. The photoelectric conversion element 134 is bonded to the lead frame 131 using a silicon resin with high heat dissipation. The silicon resin with high heat dissipation contains a filler such as alumina with good thermal conductivity, and even if the photoelectric conversion element 134 generates heat due to the irradiation of sunlight, the generated heat is efficiently supplied to the lead frame 131. I can escape. Further, distortion due to expansion due to a temperature difference between the photoelectric conversion element 134 and the lead frame 131 formed on a GaAs (gallium arsenide) substrate can be reduced.

  Electrodes 133 in which titanium, platinum, and gold are sequentially laminated are formed on both surfaces of the ceramic substrate 132. An electrode 133 (not shown) on the back surface of the ceramic substrate 132 is fused to the lead frame 131 using a solder material. The photoelectric conversion element 134 and the electrode on the ceramic substrate 132 are connected via a wire 135 bonded by wire bonding to form a positive electrode 133a and a negative electrode 133b.

  FIG. 3 is an enlarged cross-sectional view of a part of the support frame 120. The through hole 121 has an inclined surface 121a and has a tapered shape. After the photoelectric conversion unit 130 is inserted into the through hole 121 of the support frame 120, the contact portion 131a is bent. The lead frame 131 has a spring portion 131b. With the photoelectric conversion unit 130 inserted into the through hole 121, the spring portion 131 b presses against the inclined surface 121 a of the inner wall of the through hole 121 and fixes the photoelectric conversion unit 130 in the planar direction of the support frame 120. Thereby, even when there is a gap between the through hole 121 and the photoelectric conversion unit 130, the photoelectric conversion element 134 can be installed at the focal point of the condensing optical system 110. Since the spring part 131b of the photoelectric conversion unit 130 inserted into the through hole 121 presses the inclined surface 121a, it receives an upward force (positive direction in the Z-axis direction in FIG. 3) from the inclined surface 121a as a reaction. Thereby, the photoelectric conversion unit 130 receives an upward force through the spring portion 131b. Here, since the through-hole 121 has the inclined surface 121a, the photoelectric conversion unit 130 does not move in the through-hole 121 even when receiving an upward force, and is firmly fixed. Thus, since the photoelectric conversion unit 130 is fixed in the through hole 121 by the spring portion 131b pressing the inclined surface 121a, mechanical vibration is applied to the solar cell module 100 from the outside during transportation or installation. However, the photoelectric conversion unit 130 does not move in the through hole 121. Therefore, the photoelectric conversion unit 130 does not deviate from the condensing point of the condensing lens 111 by transportation or installation. Further, when the solar cell module 100 generates electricity outdoors for a long period of time, when the photoelectric conversion element 134 in the photoelectric conversion unit 130 deteriorates and stops generating power, the photoelectric conversion unit 130 on which the deteriorated photoelectric conversion element 134 is mounted is It can be removed from the through hole 121 and replaced with a new photoelectric conversion unit.

  FIG. 4 is a perspective view showing an electrical connection state between the photoelectric conversion units 130 in the solar cell module 100. The photoelectric conversion unit 130 inserted into the through hole 121 of the support frame 120 connects the electrodes 133 by wiring wires 136 made of copper wire or the like. In order to suppress thermal deformation of the support frame 120, the wiring wires 136 are connected by solder 137 having a low melting point such as Sn-Bi (tin-bismuth) solder.

[1-2. Effect]
As described above, in the present embodiment, the support frame 120 is made of the same material as the condensing optical system 110. Thereby, even if a temperature change occurs in the solar cell module 100, the condensing optical system 110 and the support frame 120 are similarly expanded and contracted. The position of the photoelectric conversion element 134 attached to the support frame 120 via the photoelectric conversion unit 130 does not cause a positional shift.

  In the present embodiment, the photoelectric conversion element 134 is provided in the lead frame 131 that is inserted into the through hole 121 and connected to the heat dissipation plate 140 through the heat dissipation grease 141. Therefore, the heat generated in the photoelectric conversion element 134 can be radiated to the outside, and the temperature rise of the photoelectric conversion element 134 can be suppressed.

  The inner diameter of the screw hole 122 is designed to be larger than the diameter of the screw 150. Since the heat radiating plate 140 and the support frame 120 are not fixed, even if the dimensions of the heat radiating plate 140 and the support frame 120 change due to the temperature change of the solar cell module 100, the support frame 120 having a large linear expansion coefficient is It can be laterally displaced with respect to the heat sink 140. As a result, even if the lateral displacement of the support frame 120 due to temperature change occurs, the photoelectric conversion element 134 is positioned at the condensing spot of the condensing lens 111, and the contact portion 131a of the lead frame 131 and the heat radiating plate 140 are radiated grease. Contact can be maintained via 141.

(Embodiment 2)
Hereinafter, Embodiment 2 will be described with reference to FIGS. The second embodiment is different from the first embodiment in that the second lens 171 is provided on the support frame 120. Hereinafter, different points will be mainly described, and description of the same configuration will be omitted.

[2-1. Constitution]
FIG. 5 is an enlarged cross-sectional view of a part of the support frame 120 of the solar cell module 100 according to Embodiment 2. Solar cell module 100 in the present embodiment includes second optical system 170 and light guide member 180 on the installation surface side of photoelectric conversion element 134 of support frame 120.

  The second optical system 170 includes a second lens 171 and a glass substrate 172, and has a function of condensing light emitted from the condenser lens 111 on the photoelectric conversion element 134. The second lens 171 and the glass substrate 172 are integrally formed, but may be separate. In the second optical system 170, the glass substrate 172 is supported in contact with a support portion 123 provided on the support frame 120. The support portion 123 is formed integrally with the support frame 120, but may be a separate body. In addition, it fixes to the position where the glass substrate 172 and the support part 123 contact using the adhesive agent which has elasticity, such as a silicon | silicone.

  The light guide member 180 is disposed between the second optical system 170 and the photoelectric conversion unit 130, and guides light emitted from the second optical system 170 to the photoelectric conversion element 134. The light guide member 180 is formed of an elastic transparent member such as silicon rubber, and molds the photoelectric conversion element 134 disposed on the photoelectric conversion unit 130.

  FIG. 6 is a perspective view of the support frame 120 showing how the second optical system 170 of the solar cell module 100 in this embodiment is attached. The second optical system 170 is installed to support the four corners of the glass substrate 172 by the support portion 123 after the light guide member 180 is provided on the photoelectric conversion element 134. The light guide member 180 has elasticity, and comes into close contact with the glass substrate 172 when the second optical system 170 is disposed. The glass substrate 172 is not limited to a rectangle, and may be a polygon or a circle. In the case of a circular shape, it is desirable that the shape of the support portion 123 be a shape having the same curvature as that of the glass substrate 172. By this. The alignment process during manufacturing can be omitted.

[2-2. Effect]
As described above, in the present embodiment, the support frame 120 and the support portion 123 are made of the same material as the condensing optical system 110. Thereby, even if a temperature change occurs in the solar cell module 100, the condensing optical system 110, the support frame 120, and the support portion 123 are similarly expanded and contracted. The positions of the sunlight condensing spot, the second optical system 170 supported by the support portion 123, and the photoelectric conversion element 134 can suppress positional deviation.

  In the present embodiment, the photoelectric conversion element 134 is provided on the lead frame 131 that is inserted into the through hole 121 and connected to the heat dissipation plate 140 via the heat dissipation grease 141. Thereby, the heat generated in the photoelectric conversion element 134 can be radiated to the outside, and the temperature rise of the photoelectric conversion element 134 can be suppressed.

(Embodiment 3)
Hereinafter, the third embodiment will be described with reference to FIGS. Note that the third embodiment is different from the first embodiment in that the opening 140a of the heat radiating plate 140 and the heat radiating fins 142 are provided. Hereinafter, different points will be mainly described, and description of the same configuration will be omitted.

[3-1. Constitution]
FIG. 7 is a cross-sectional view of solar cell module 100 in the third embodiment. FIG. 8 is a perspective view for explaining heat radiation fin 142 of solar cell module 100 in the third embodiment. The heat dissipation plate 140 of the solar cell module 100 in the present embodiment includes openings 140a and heat dissipation fins 142. The opening 140a is provided in a strip shape in one direction (Y-axis direction in FIG. 7) at a position where it does not contact the contact portion 131a of the lead frame 131 in the heat radiating plate 140. The heat radiation fins 142 are plate-like members provided along the openings 140 a in the heat radiation plate 140 immediately below the contact portions 131 a of the lead frame 131. The radiating fin 142 has a substantially L-shaped cross section perpendicular to the Y-axis direction of the drawing, and has a surface perpendicular to the radiating plate 140. As a result, the surface area of the heat radiating member is increased to improve the efficiency of heat dissipation. The heat radiating plate 140 and the heat radiating fins 142 may be formed integrally or separately.

  Further, the sealing portion 160 is disposed between the support frame 120 and the heat radiating plate 140 along the opening 140a. Thereby, even when the opening 140a is provided, moisture or the like is prevented from entering the inside of the support frame 120 from the outside.

[3-2. Effect]
As described above, the heat dissipation plate 140 of the solar cell module 100 in the present embodiment includes the openings 140a and the heat dissipation fins 142. Accordingly, stray light that does not enter the photoelectric conversion element 134 out of the light emitted from the condensing optical system 110 can be emitted to the outside. The heat radiation fins 142 are provided perpendicular to the heat radiation plate 140. Thereby, when the solar cell module 100 is provided in a tracking device that can vertically enter sunlight, it is possible to suppress stray light emitted from the opening 140 a from hitting the radiation fins 142.

(Other embodiments)
The above-described embodiments are for illustrating the technique in the present disclosure, and various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and their equivalents.

  The present disclosure is applicable to a concentrating solar cell device that condenses light by a condensing member such as a lens.

100 Solar cell module 110 Condensing optical system (an example of a condensing member)
DESCRIPTION OF SYMBOLS 111 Condensing lens 120 Support frame 120a Side wall 120b Bottom surface 121 Through hole 121a Inclined surface 122 Screw hole 123 Support part 130 Photoelectric conversion unit 131 Lead frame (an example of 1st heat radiating member)
131a Contact part 131b, 131c Spring part 132 Ceramic substrate 133 Electrode 134 Photoelectric conversion element 135 Wire 136 Wiring wire 140 Heat radiation plate (an example of a second heat radiation member)
140a opening 141 heat radiation grease (an example of a third heat radiation member)
142 Radiation fin 150 screw (an example of a regulating member)
160, 161 Sealing portion 170 Second optical system 171 Second lens 172 Glass substrate 180 Light guide member

Claims (5)

A light collecting member for collecting sunlight;
A photoelectric conversion element that receives light emitted from the light collecting member;
A first heat dissipation member that supports the photoelectric conversion element;
A support substrate having a through hole and supporting the light collecting member,
The first heat radiating member is disposed in the through hole.
Solar cell module. A second heat dissipating member;
The heat dissipation member is in contact with the second heat dissipation member at a position facing the solar cell;
The solar cell module according to claim 1. Between the first heat radiating member and the second heat radiating member, a third heat radiating member having a lower rigidity than the support substrate and the second heat radiating member is disposed.
The solar cell module according to claim 1 or 2. A regulating member for regulating movement of the second heat radiating plate in a direction perpendicular to the surface direction of the support substrate;
The regulating member allows movement of the second heat radiating plate in the surface direction;
The solar cell module according to any one of claims 1 to 3. The first heat dissipating member has a spring portion;
The spring portion contacts the inner wall of the through hole;
The solar cell module according to any one of claims 1 to 4.

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