JP6670989B2 - Solar cell module - Google Patents

Description

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

  Patent Literature 1 discloses a solar cell in which a heat sink is disposed on the back surface of a solar cell element. The solar cell includes a concentrating solar cell element that photoelectrically converts the condensed and irradiated sunlight to generate power, and a receiver substrate on which the solar cell element is mounted. The receiver substrate includes a base, an intermediate insulating layer stacked on the base, a connection pattern layer stacked on the intermediate insulating layer, and a surface protection layer for protecting the connection pattern layer. This makes it possible to obtain high power generation efficiency with good heat dissipation and productivity.

JP 2008-91440 A

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

  A solar cell module according to an embodiment of 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 for supporting the optical member, wherein the lead frame is disposed in the through hole.

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

Sectional view showing the configuration of the solar cell module according to Embodiment 1. FIG. 3 is a perspective view illustrating a configuration of a photoelectric conversion unit in Embodiment 1. Sectional view in which a part of the support frame in Embodiment 1 is enlarged. Perspective view for describing a connection state of a photoelectric conversion unit in Embodiment 1. Sectional view where a part of the second optical system and the support frame in Embodiment 2 is enlarged. Perspective view for describing a second optical system according to Embodiment 2. Sectional view showing the configuration of the solar cell module according to Embodiment 3. Perspective view showing the configuration of the solar cell module according to Embodiment 3.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, an unnecessary detailed description may be omitted. For example, a detailed description of a well-known item or a redundant description of substantially the same configuration may be omitted. This is to prevent the following description from being 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 claimed subject matter.

(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 sink 140. A plurality of the solar cell modules 100 are arranged side by side in a tracking device (not shown) that tracks the sunlight so as to vertically enter the condensing optical system 110.

  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 condenser lenses 111 may be integrated or separate. The condensing optical system 110 has a plane of incidence of sunlight and a plane of emission of sunlight having a Fresnel surface.

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

  Here, the screw 150 is attached to the radiator 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 linear expansion coefficient between the support frame 120 and the radiator plate 140. Designed. Further, the heat sink 140 and the support frame 120 are not fixed. That is, even if the size of the heat radiating plate 140 and the size of the support frame 120 are changed due to the temperature change of the solar cell module 100, the screw 150 is displaced laterally in the X-axis direction in FIG. I support it as much as I can. Further, even when the support frame 120 is displaced laterally due to a temperature difference, the contact portion 131 a of the photoelectric conversion unit 130 and the heat sink 140 can maintain contact with each other through the heat radiation 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, a sealing portion 161 is applied to an exposed portion of the screw 150 penetrating the heat sink 140. The sealing portions 160 and 161 are sheared and deformed in the X-axis and Y-axis directions when the support frame 120 expands and contracts in the X and Y-axis directions due to a temperature change, and when the sealing portions 160 and 161 are laterally displaced. However, no stress is applied to the solar cell module 100. Therefore, the sealing portions 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 illustrating 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 131b and 131c abut on the side surface of the through hole 121. The lead frame 131 is made of phosphor bronze having good thermal conductivity and subjected to nickel plating. The photoelectric conversion element 134 is bonded to the lead frame 131 using a silicon resin having high heat dissipation. The silicon resin having high heat dissipation contains a filler such as alumina having good thermal conductivity, so that even if the photoelectric conversion element 134 generates heat by irradiating sunlight, the generated heat is efficiently transferred to the lead frame 131. You 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.

  On both surfaces of the ceramic substrate 132, electrodes 133 in which titanium, platinum, and gold are sequentially laminated are formed. 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 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 to fix the photoelectric conversion unit 130 in the plane direction of the support frame 120. Accordingly, 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 light collecting optical system 110. Since the spring portion 131b of the photoelectric conversion unit 130 inserted into the through hole 121 presses the inclined surface 121a, the spring portion 131b receives an upward force (a 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 it receives an upward force, and is firmly fixed. As described above, in the photoelectric conversion unit 130, since the spring portion 131b is fixed in the through hole 121 by pressing the inclined surface 121a, mechanical vibration is externally applied to the solar cell module 100 during transportation or installation. However, the photoelectric conversion unit 130 does not move through the through hole 121. Therefore, the photoelectric conversion unit 130 does not deviate from the focal point of the condenser lens 111 due to transportation or installation. Further, when the photoelectric conversion element 134 in the photoelectric conversion unit 130 is deteriorated when the solar cell module 100 generates power outdoors for a long time and stops generating power, the photoelectric conversion unit 130 having the deteriorated photoelectric conversion element 134 is mounted on the solar cell module 100. 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. In the photoelectric conversion unit 130 inserted into the through hole 121 of the support frame 120, the electrodes 133 are connected by wiring wires 136 made of copper wire or the like. The connection of the wiring wires 136 is performed by low melting point solder 137 such as Sn-Bi (tin-bismuth) solder in order to suppress thermal deformation of the support frame 120.

[1-2. Effects]
As described above, in the present embodiment, the support frame 120 is made of the same material as the condensing optical system 110. As a result, even if a temperature change occurs in the solar cell module 100, the condensing optical system 110 and the support frame 120 expand and contract in the same manner, so that the condensing spot of sunlight condensed by the condensing lens 111 Then, the position of the photoelectric conversion element 134 mounted in the support frame 120 via the photoelectric conversion unit 130 does not shift.

  In the present embodiment, the photoelectric conversion element 134 is provided in the lead frame 131 inserted into the through hole 121 and connected to the heat radiating plate 140 through the heat radiating grease 141. Therefore, heat generated in the photoelectric conversion element 134 can be radiated to the outside, and a rise in the temperature 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 radiator plate 140 and the support frame 120 are not fixed, even if the size of the radiator plate 140 and the support frame 120 changes due to the temperature change of the solar cell module 100, the support frame 120 having a large linear expansion coefficient is The lateral displacement with respect to the heat sink 140 is possible. Accordingly, even if the support frame 120 is displaced laterally due to a temperature change, the contact portion 131a of the lead frame 131 and the heat radiating plate 140 are radiated by the thermal grease while the photoelectric conversion element 134 is positioned at the condensing spot of the condensing lens 111. Contact can be maintained via 141.

(Embodiment 2)
Hereinafter, the second embodiment will be described with reference to FIGS. Note that 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. The solar cell module 100 according to the present embodiment includes the second optical system 170 and the light guide member 180 on the support frame 120 on the side where the photoelectric conversion element 134 is installed.

  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 to the photoelectric conversion element 134. Although the second lens 171 and the glass substrate 172 are formed integrally, they may be separate bodies. In the second optical system 170, the glass substrate 172 is supported by being 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 formed separately. The glass substrate 172 and the support portion 123 are fixed at positions where they contact each other using an elastic adhesive such as silicon.

  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 support frame 120 showing how the second optical system 170 of solar cell module 100 according to the present embodiment is attached. The second optical system 170 is installed so that the support unit 123 supports four corners of the glass substrate 172 after the light guide member 180 is provided on the photoelectric conversion element 134. The light guide member 180 has elasticity, and when the second optical system 170 is disposed, the light guide member 180 comes into close contact with the glass substrate 172. Note that 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 also be a shape having the same curvature as the glass substrate 172. By this. The step of alignment at the time of manufacturing can be omitted.

[2-2. Effects]
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. Thus, 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 similarly expand and contract, so that the light is condensed by the condensing lens 111. The position shift of the condensing spot of sunlight, the second optical system 170 supported by the support unit 123, and the photoelectric conversion element 134 can be suppressed.

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

(Embodiment 3)
Hereinafter, the third embodiment will be described with reference to FIGS. 7 and 8. The third embodiment is different from the first embodiment in that the third embodiment has an opening 140a of the heat radiation plate 140 and a heat radiation fin 142. 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 according to Embodiment 3. FIG. 8 is a perspective view for explaining heat radiation fins 142 of solar cell module 100 in the third embodiment. Heat radiating plate 140 of solar cell module 100 according to the present embodiment includes opening 140a and heat radiating fin 142. The opening 140a is formed in a strip shape in one direction (Y-axis direction in FIG. 7) at a position on the heat sink 140 that does not contact the contact portion 131a of the lead frame 131. The heat radiation fin 142 is a plate-like member provided along the opening 140 a directly below the contact portion 131 a of the lead frame 131 in the heat radiation plate 140. The radiation fin 142 has a substantially L-shaped cross section perpendicular to the Y-axis direction in the drawing, and has a surface perpendicular to the radiation plate 140. Thereby, the surface area of the heat radiating member is increased to improve the heat radiation efficiency. The heat radiating plate 140 and the heat radiating fin 142 may be formed integrally or separately.

  A sealing portion 160 is arranged between the support frame 120 and the heat sink 140 along the opening 140a. Thus, even when the opening 140a is provided, it is possible to prevent moisture and the like from entering the inside of the support frame 120 from the outside.

[3-2. Effects]
As described above, radiator plate 140 of solar cell module 100 in the present embodiment includes opening 140a and radiator fin 142. Accordingly, of the light emitted from the light collecting optical system 110, stray light that does not enter the photoelectric conversion element 134 can be emitted to the outside. Further, the radiation fins 142 are provided perpendicular to the radiation plate 140. Accordingly, 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 140a from hitting the radiation fins 142.

(Other embodiments)
It should be noted that the above-described embodiments are intended to exemplify the technology of the present disclosure, and thus various changes, substitutions, additions, omissions, and the like can be made within the scope of the claims or the equivalents thereof.

  The present disclosure is applicable to a concentrating solar cell device that collects light using a light-collecting member such as a lens.

100 solar cell module 110 condensing optical system (one example of condensing member)
111 Condensing lens 120 Support frame 120a Side wall 120b Bottom surface 121 Through hole 121a Inclined surface 122 Screw hole 123 Support portion 130 Photoelectric conversion unit 131 Lead frame (an example of a first heat dissipation member)
131a contact part 131b, 131c spring part 132 ceramic substrate 133 electrode 134 photoelectric conversion element 135 wire 136 wiring wire 140 heat sink (an example of a second heat sink)
140a Opening 141 Thermal grease (an example of a third thermal member)
142 Heat radiation fin 150 Screw (an example of a regulating member)
160, 161 Sealing section 170 Second optical system 171 Second lens 172 Glass substrate 180 Light guide member

Claims (4)

A light-collecting member that collects 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;
The same material as the light collecting member, having a through-hole, a support substrate that supports the light collecting member,
A second heat radiation member;
With
The first heat radiating member is disposed in the through hole, and is in thermal contact with the second heat radiating member at a position facing the photoelectric conversion element with the support substrate interposed therebetween.
Solar cell module. A third heat dissipating member having a lower rigidity than the second heat dissipating member is disposed between the first heat dissipating member and the second heat dissipating member.
The solar cell module according to claim 1 . A regulating member that regulates movement of the second heat radiating member in a direction perpendicular to an incident surface of the light collecting member;
The restricting member allows the second heat radiating member to move in a direction parallel to the incident surface of the light collecting member,
The solar cell module according to claim 1 . The first heat radiation member has a spring portion,
The spring portion is in contact with an inner wall of the through hole;
The solar cell module according to claim 1 .

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