WO2009096267A1 - 太陽電池、集光型太陽光発電モジュール、および太陽電池製造方法 - Google Patents
太陽電池、集光型太陽光発電モジュール、および太陽電池製造方法 Download PDFInfo
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- WO2009096267A1 WO2009096267A1 PCT/JP2009/050762 JP2009050762W WO2009096267A1 WO 2009096267 A1 WO2009096267 A1 WO 2009096267A1 JP 2009050762 W JP2009050762 W JP 2009050762W WO 2009096267 A1 WO2009096267 A1 WO 2009096267A1
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- solar cell
- sunlight
- optical member
- power generation
- cell element
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/30—Arrangements for concentrating solar-rays for solar heat collectors with lenses
- F24S23/31—Arrangements for concentrating solar-rays for solar heat collectors with lenses having discontinuous faces, e.g. Fresnel lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/79—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/10—Arrangement of stationary mountings or supports for solar heat collector modules extending in directions away from a supporting surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
- F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
- F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
- F24S30/425—Horizontal axis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0543—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the refractive type, e.g. lenses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
Definitions
- the present invention relates to a solar cell that includes a solar cell element that photoelectrically converts the concentrated sunlight and a columnar optical member that irradiates the solar cell element with the concentrated sunlight, and a concentrating type that includes such a solar cell.
- the present invention relates to a solar power generation module and a solar cell manufacturing method for manufacturing such a solar cell.
- a flat plate structure of a non-condensing fixed type in which a solar power generation module configured by laying solar cell elements without gaps is installed on a roof or the like is common.
- a technique for reducing the amount of high-priced solar cell elements among members (parts) constituting the solar power generation apparatus has been proposed.
- FIG. 12 is a cross-sectional view showing a configuration example of a concentrating solar power generation module applied to the tracking concentrating solar power generation device of Conventional Example 1.
- the concentrating solar power generation module 101 receives and condenses sunlight Ls incident in parallel to the optical axis Lax and perpendicular to the incident surface, and a condensing lens 150.
- a solar cell 110 that photoelectrically converts the sunlight Ls collected by.
- the solar cell 110 includes a solar cell element 111 that photoelectrically converts the concentrated sunlight Ls, and a receiver substrate 120 on which the solar cell element 111 is placed.
- the wavelength region of sunlight Ls includes a medium / short wavelength region from a short wavelength of 400 nm to an intermediate wavelength of 1000 nm (1 ⁇ m), and a long wavelength region exceeding 1 ⁇ m. Therefore, among the sunlight Ls collected by the condenser lens 150, the sunlight Ls in the middle and short wavelength side region is collected toward the focal point FPb side, so that it is near the center of the solar cell element 111. The light is collected and constitutes a medium and short wavelength-side light collecting region FLRb.
- the long wavelength side is disposed on the medium / short wavelength side concentrated light flux region FLRb and the outer periphery thereof (for example, the outer periphery of the solar cell element 111). Condensed light flux region FLRc is formed.
- the tracking concentrating solar power generation device of Conventional Example 1 has applied the concentrating solar power generation module 101 having a high condensing magnification by the action of the condensing lens 150.
- the refraction by the condensing lens 150 is slightly different for each of a wide range of wavelengths included in the sunlight Ls, the refraction state varies greatly depending on the wavelength region. Therefore, as described above, sunlight Ls that is not condensed on the solar cell element 111 (the outer peripheral side region FLRcs of the long wavelength side concentrated light flux region FLRc) may be generated.
- misaligned sunlight Ls when the misaligned sunlight Ls is irradiated to a region other than the solar cell element 111, a portion of the member irradiated with the thermal energy of the misaligned sunlight Ls (for example, an insulating film on the receiver substrate 120, There is a problem that the wiring, etc.) becomes high temperature and may be burnt (damaged) in some cases.
- the solar cell element 111 since the solar cell element 111 generates heat due to the concentrated sunlight Ls, there is a problem that the photoelectric conversion efficiency is lowered and the generated power (output) is lowered.
- FIG. 13 is a cross-sectional view showing a configuration of a concentrating solar power generation module applied to the tracking concentrating solar power generation apparatus of Conventional Example 2.
- a concentrating solar power generation module 140m includes a condensing lens 142 that receives and collects sunlight Lsv (sunlight Ls) incident in parallel to the optical axis Lax and perpendicular to the incident surface.
- the solar cell 110 that photoelectrically converts sunlight Ls (sunlight Lsa) collected by the condenser lens 142 is provided. Further, the solar cell 110 includes a solar cell element 111 that photoelectrically converts sunlight Lsa collected by the condenser lens 142 to the focal position FP, and a receiver substrate 120 on which the solar cell element 111 is placed.
- the tracking and concentrating solar power generation device of Conventional Example 2 applied the concentrating solar power generation module 140m having a high condensing magnification by the action of the condensing lens 142.
- the condensing lens 142 is generally applied to perform condensing.
- the wavelength region in the sensitivity wavelength region of the solar cell element 111, particularly in the short wavelength region.
- sunlight Ls unsunlight Lsb
- the alignment error between the condenser lens 142 and the solar cell element 111, the positional deviation due to the difference in the temperature characteristics of the members constituting the solar power generation module 140m, and the like occur.
- sunlight Ls unsunlight Lss
- the sunlight Ls (sunlight Lsb, Lss) that is not condensed on the solar cell element 111 due to the difference in the refraction state depending on the wavelength region, the positional deviation between the constituent members, and the like is substantially equal to the solar cell element 111. Therefore, there is a problem in that the amount of incident light is reduced and the generated power (output) of the solar cell element 111 is reduced to cause a loss.
- a member for example, an insulating film on the receiver substrate 120, a wiring, or the like
- the thermal energy of the misaligned sunlight Lss .
- This invention is made
- the holding frame is provided with a contact frame body and a support body that is arranged away from the columnar optical member and supports the contact frame body, and the side surface of the columnar optical member is inclined so as to totally reflect sunlight toward the irradiation surface.
- the incident light collection area formed by the collected sunlight on the incident surface is located inside the incident surface, so that the fluctuation of the light collection characteristic is prevented and the light collection characteristic is improved.
- To improve the light collection efficiency and photoelectric conversion efficiency To provide a heat and reliable solar cell to a first object.
- this invention is a concentrating solar power generation module provided with the solar cell which photoelectrically converts the sunlight condensed with the condensing lens, Comprising: The solar cell which improved the condensing efficiency and heat dissipation is provided. Therefore, a second object is to provide a concentrating solar power generation module having improved heat generation efficiency and power generation and having high heat resistance and high reliability.
- the present invention also includes a receiver substrate on which a solar cell element is placed, a columnar optical member that irradiates the solar cell element with sunlight collected by a condensing lens without waste, and a side surface of the columnar optical member.
- the solar cell for manufacturing a solar cell comprising: a frame-shaped contact frame body and a support member disposed apart from the columnar optical member and supporting the contact frame body, and a holding unit erected on the receiver substrate
- a battery manufacturing method comprising: a support fixing step for fixing a support to a receiver substrate; a translucent resin injecting step for injecting a translucent resin into the inner resin stopper;
- the present invention includes a columnar optical member that irradiates the solar cell element with sunlight collected by the condenser lens without waste, and an optical holding unit that is placed on the receiver substrate and holds the columnar optical member.
- a fourth object is to provide a solar cell with improved heat condensing characteristics and heat dissipation, and improved heat generation efficiency and power generation, and having high heat resistance, reliability, and weather resistance.
- this invention is a concentrating solar power generation module provided with the solar cell which photoelectrically converts the sunlight condensed with the condensing lens, Comprising: The solar cell which improved the condensing characteristic and heat dissipation is provided.
- a fifth object is to provide a concentrating solar power generation module with improved heat generation efficiency and power generation and having high heat resistance, reliability, and weather resistance.
- the present invention also includes a columnar optical member that irradiates the solar cell element with sunlight collected by the condenser lens without waste, and an optical holding unit that is placed on the receiver substrate and holds the columnar optical member with a holding wall.
- a solar cell manufacturing method for manufacturing a solar cell comprising: a resin injection step of injecting a sealing resin that forms a resin sealing portion in a space formed by an optical holding portion (holding wall) and a receiver substrate; and a holding wall
- a sixth object is to manufacture a solar cell with improved heat resistance, high reliability, and high weather resistance at low cost with high productivity.
- a first solar cell according to the present invention includes a solar cell element that photoelectrically converts sunlight collected by a condenser lens, a receiver substrate on which the solar cell element is placed, and condensed sunlight.
- a columnar optical member having an incident surface for incidence and an irradiation surface that is disposed opposite to the solar cell element and irradiates the solar cell element with sunlight, and a holder that is erected on the receiver substrate and holds the columnar optical member
- a frame-shaped abutting frame body that is in contact with a side surface of the columnar optical member and has a thickness from the incident surface toward the irradiation surface,
- a support body disposed apart from the columnar optical member and supporting the contact frame, and the side surface is inclined so as to totally reflect incident sunlight in the direction of the irradiation surface,
- the entrance surface is formed by the concentrated sunlight.
- the converging light flux area is the incident face converging beam region size to be located inside the formation to the incident surface.
- the incident surface collected light beam region is reliably positioned within the region of the incident surface to collect light. It is possible to prevent fluctuations in characteristics, and it is possible to disperse the heat applied to the columnar optical member by the concentrated sunlight to the surrounding space by the side surface and the contact frame, so that the light collection efficiency And it can be set as the heat resistant and highly reliable solar cell which improved the photoelectric conversion efficiency.
- the side surface has an inclination angle of 8 degrees to 20 degrees with respect to a direction perpendicular to the irradiation surface.
- the irradiation surface has a size located inside the solar cell element.
- this configuration can prevent the receiver substrate from being irradiated with unnecessary sunlight that does not contribute to photoelectric conversion, the receiver substrate can be prevented from being burned out and a highly reliable solar cell can be obtained.
- the contact frame is rectangular, and the support is arranged in a columnar shape at four corners of the contact frame. To do.
- the contact frame body and the columnar optical member can be aligned with high accuracy, and the solar cell element is obtained by the chimney effect in the space provided around the solar cell element and the columnar optical member.
- the photoelectric conversion efficiency can be improved.
- the first concentrating solar power generation module condenses sunlight to make it incident on a solar cell, and photoelectrically converts the sunlight collected by the condensing lens.
- a concentrating solar power generation module including a solar cell, wherein the solar cell is the first solar cell according to the present invention.
- the minimum light collection region where the light collection region is minimized is configured to be located inside the columnar optical member.
- the thickness of the abutment frame is such that the outer peripheral side region of the long wavelength side converging light beam region formed by the long wavelength side sunlight is shielded. It is characterized by having a thickness.
- the minimum light collection region is configured to be positioned between a bottom portion of the contact frame and the irradiation surface. To do.
- the focal point group formed by the focal point of the condensing lens that is displaced according to the temperature change of the condensing lens includes the bottom portion and the irradiation surface. It is characterized by being located between.
- the position of the solar cell when the position of the solar cell is an intermittent tracking control mode in which the position of the solar cell is moved in advance to the destination of the sun on the solar orbit every specified time.
- the entrance surface collecting light flux region is configured to be located inside the entrance surface.
- the 1st solar cell manufacturing method which concerns on this invention is condensed with the solar cell element which photoelectrically converts the sunlight condensed with the condensing lens, the receiver board
- a columnar optical member having an incident surface on which the sunlight is incident and an irradiation surface arranged to face the solar cell element and irradiating the solar cell element with sunlight, and abutted on the side surface of the columnar optical member
- a method for manufacturing a solar cell comprising: a substrate preparation step for preparing the receiver substrate on which the solar cell element is placed; and a light transmitting method in which an adhesive resin is applied to the receiver substrate and the solar cell element is resin-sealed.
- Inner resin stopper that is injected with functional resin And a resin stopper forming step for forming an outer resin stopper for fixing the support on the outer side of the inner resin stopper, and curing the adhesive resin by bonding the support to the outer resin stopper.
- a columnar optical member placing step for placing the irradiation surface on the translucent resin in contact with a frame, and a resin sealing portion forming step for curing the translucent resin to form a resin sealing portion It is characterized by providing.
- a heat-resistant and highly reliable solar cell that prevents the fluctuation and improves the light collection efficiency and photoelectric conversion efficiency by dispersing the heat applied to the columnar optical member by the concentrated sunlight by the contact frame. Can be manufactured easily and with high accuracy.
- a second solar cell according to the present invention includes a solar cell element that photoelectrically converts sunlight condensed by a condensing lens, a receiver substrate on which the solar cell element is placed, and the solar cell element sealed with resin.
- a columnar optical member that constitutes a light guide that guides the concentrated sunlight to the solar cell element, and a holding wall that holds the columnar optical member. And an optical holding part placed on the receiver substrate so as to cover the resin sealing part.
- the columnar optical member has an optical path inclined surface for collecting sunlight on the solar cell element, and the holding wall is aligned with the optical path inclined surface. It is characterized by being a holding inclined surface.
- the columnar optical member can be aligned with the optical holding portion in a self-aligning manner, and the columnar optical member can be held with high accuracy by the holding wall, so that the light guide path is positioned with high accuracy.
- the light condensing characteristics can be improved.
- the optical holding portion is in contact with a metal base base of the receiver substrate.
- the optical holding portion includes comb-shaped fins on an outer peripheral side surface.
- This configuration makes it possible to further improve the heat dissipation characteristics, and further improve the power generation efficiency and reliability.
- the columnar optical member is a quadrangular column
- the optical holding unit includes a groove-shaped notch that surrounds the axial corner of the quadrangular column. It is characterized by that.
- the light guide path can be defined (positioned) with high accuracy.
- the resin sealing portion is thinner than the surrounding region between the columnar optical member and the solar cell element.
- the surface (irradiation surface) facing the solar cell element of the columnar optical member can be reliably brought close to the solar cell element, so that the sunlight collected by the columnar optical member is effectively collected.
- the solar cell element can be irradiated.
- it since it becomes possible to suppress the temperature rise of the receiver board
- a second concentrating solar power generation module includes a condensing lens that condenses sunlight and a solar cell that photoelectrically converts the sunlight condensed by the condensing lens.
- An optical solar power generation module, wherein the solar cell is the second solar cell according to the present invention.
- a concentrated solar photovoltaic module with high heat resistance, reliability, and weather resistance that improves power generation efficiency and power generation by reducing power generation efficiency and temperature rise caused by misalignment of the concentrated sunlight. It becomes possible.
- the 2nd solar cell manufacturing method which concerns on this invention is a solar cell element which photoelectrically converts the sunlight condensed with the condensing lens, the receiver board
- a solar cell manufacturing method for manufacturing a solar cell that includes an optical holding portion that covers a resin sealing portion and is placed on the receiver substrate, wherein the optical holding portion prepares the optical holding portion by molding a metal.
- a preparatory step an optical holding portion arranging step of placing the optical holding portion in contact with the receiver substrate on an outer periphery of the solar cell element, and the resin sealing in a space formed by the optical holding portion and the receiver substrate Sealing resin forming part
- a resin injection step of injecting characterized in that it comprises an optical member placement step of placing the columnar optical member on the holding wall.
- the optical holding unit and the columnar optical member can be positioned with high accuracy by a simple process, and a light guide and an optical holding unit for effectively guiding sunlight with high accuracy can be easily formed. Therefore, heat collection characteristics and heat dissipation are improved, heat generation efficiency and power generation efficiency are improved by reducing power generation efficiency and preventing temperature rise caused by misalignment of the concentrated sunlight. Therefore, it becomes possible to manufacture a solar cell having high weather resistance at low cost with good productivity.
- a solar cell element that photoelectrically converts sunlight collected by the condenser lens, a receiver substrate on which the solar cell element is placed, and the concentrated solar cell
- a columnar optical member having an incident surface on which light is incident and an irradiation surface arranged to face the solar cell element and irradiating the solar cell element with sunlight, and standing on the receiver substrate and holding the columnar optical member
- a frame-shaped contact frame that is in contact with a side surface of the columnar optical member and has a thickness from the incident surface toward the irradiation surface.
- a support member that is disposed apart from the columnar optical member and supports the contact frame, and the side surface is inclined so as to totally reflect incident sunlight in the direction of the irradiation surface.
- the incident surface is shaped by the concentrated sunlight. Since the collected light flux region is sized so that the incident surface collected light flux region formed on the incident surface is located inside, the collected sunlight (collected light flux region) is positioned with respect to the center of the columnar optical member. In the event of a deviation, it is possible to prevent the fluctuation of the condensing characteristic by surely positioning the incident surface collecting light flux region within the region of the incident surface, and the condensed sunlight is added to the columnar optical member. Since heat can be dispersed to the surrounding space by the side surface and the contact frame body, it is possible to obtain a heat-resistant and highly reliable solar cell with improved light collection efficiency and photoelectric conversion efficiency. Play.
- the condensing lens that condenses the sunlight and enters the solar cell, and the sunlight condensed by the condensing lens is photoelectrically converted. It is a concentrating solar power generation module comprising a solar cell to be converted, and since the solar cell is the first solar cell according to the present invention, it is formed on the incident surface by the condensed sunlight. Condensed light with high heat resistance and improved condensing efficiency and converted light rate without reducing condensing efficiency even when the incident surface concentrated light flux region is misaligned with the center of the incident surface There is an effect that it is possible to make a solar photovoltaic module.
- a solar cell element that photoelectrically converts sunlight collected by the condenser lens, a receiver substrate on which the solar cell element is placed, a collector
- a columnar optical member having an incident surface on which illuminated sunlight is incident and an irradiation surface arranged to face the solar cell element and irradiating the solar cell element with sunlight, and abutting on a side surface of the columnar optical member
- a solar cell comprising: a frame-shaped contact frame body; and a support unit that is disposed apart from the columnar optical member and supports the contact frame body, and a holding unit that is erected on the receiver substrate.
- a solar cell manufacturing method for manufacturing a substrate preparation step for preparing the receiver substrate on which the solar cell element is mounted, and applying an adhesive resin to the receiver substrate to seal the solar cell element with resin Inner tree to which translucent resin is injected
- a columnar optical member placement step for placing the irradiation surface on the translucent resin in contact with the abutment frame, and a resin sealing portion for curing the translucent resin to form a resin sealing portion
- Condensation characteristics are prevented from changing, and the concentrated sunlight is columnar light.
- dispersing the heat applied to the member by abutting frame member is advantageously possible to manufacture the light collection efficiency and the photoelectric heat resistance and high solar reliable conversion efficiency improves with ease and high accuracy.
- a solar cell element that photoelectrically converts sunlight collected by the condenser lens, a receiver substrate on which the solar cell element is placed, and the solar cell element are sealed with resin.
- a columnar optical member that constitutes a light guide that guides the concentrated sunlight to the solar cell element, and a holding wall that holds the columnar optical member. Since it has an optical holding part that covers and is placed on the receiver board, it has a light collecting characteristic that can collect sunlight with high accuracy in a wide wavelength range by securing a light guide with high positional accuracy and stability.
- Heat resistance, reliability, and weather resistance that improve the power generation efficiency and power generation by improving the light condensing characteristics and heat dissipation, and reducing the power generation efficiency and temperature rise caused by the misalignment of the concentrated sunlight The effect that can improve Unlikely to.
- the 2nd concentrating solar power generation module which concerns on this invention, it is provided with the condensing lens which condenses sunlight, and the solar cell which photoelectrically converts the sunlight condensed with the condensing lens.
- the solar cell is the second solar cell according to the present invention, it has a light condensing characteristic capable of concentrating sunlight with high accuracy in a wide wavelength region by securing a light guide having high positional accuracy and stability. Obtained, improving the light collection characteristics and heat dissipation, reducing the power generation efficiency caused by the positional deviation of the concentrated sunlight and preventing the temperature rise, improving the power generation efficiency and power generation, heat resistance, reliability, There exists an effect that a weather resistance can be improved.
- a solar cell element that photoelectrically converts sunlight condensed by a condenser lens, a receiver substrate on which the solar cell element is placed, and a solar cell element A resin sealing portion having a resin sealing portion for resin sealing, a columnar optical member that constitutes a light guide for guiding condensed sunlight to the solar cell element, and a holding wall for holding the columnar optical member.
- a solar cell manufacturing method for manufacturing a solar cell including an optical holding unit that covers and is placed on a receiver substrate, an optical holding unit preparing step for preparing an optical holding unit by molding a metal, and an optical holding unit
- a columnar optical member on the holding wall An optical member placing step for placing the optical holding portion and the columnar optical member in a simple process with high accuracy, and a light guide for effectively guiding sunlight with high accuracy and Since the optical holding part can be easily formed, the light collection efficiency and generated power are improved by improving the light collection characteristics and heat dissipation, and reducing the power generation efficiency and the temperature rise caused by the misalignment of the collected sunlight.
- FIG. 6 is a tracking state conceptual diagram conceptually showing a relationship between a tracking state when the concentrating photovoltaic power generation module according to Embodiment 4 of the present invention is subjected to intermittent tracking control and an incident surface collecting light flux region formed on the incident surface.
- FIG. 8 is an enlarged plan view showing a state in which the solar cell shown in FIG. 7 is enlarged from the condenser lens side.
- FIG. 9 is an enlarged cross-sectional view showing a cross section in the arrow YY direction of FIG.
- FIG. 10 is a process diagram for explaining a solar cell manufacturing method according to Embodiment 8 of the present invention, in which the sealing resin is injected into the space formed between the optical holder and the receiver substrate; Shown in cross section in X direction.
- FIG. 8 It is process drawing explaining the solar cell manufacturing method which concerns on Embodiment 8 of this invention, and shows the state which mounted the columnar optical member in the optical holding part in the cross section in the arrow XX direction of FIG. It is a perspective view which shows roughly the structure of the concentrating solar power generation unit which concerns on Embodiment 9 of this invention.
- FIG. It is sectional drawing which shows the structure of the concentrating photovoltaic power generation module applied to the tracking concentrating photovoltaic power generation apparatus of the prior art example 2.
- Concentrating Solar Power Generation Module 205 Tracking Control Unit 210 Solar Cell 211 Solar Cell Element 220 Receiver Substrate 221 Inner Resin Stopper 222 Outer Resin Stopper 225 Resin Sealing Unit 230 Columnar Optical Member 231 Incident Surface 232 Irradiation Surface 233 Side Surface 240 Holding unit 241 Contact frame 241b Bottom 241g Groove 242 Support 250 Condensing lens FLR Focusing light region FLRb Medium / short wavelength side light collection region FLRc Long wavelength side light collection region FLRcs Outer side region FLRd Incident surface collection beam region FLRs Minimum collection Light flux area FLR (T1) Light flux collection area (temperature T1) FLR (T2) Light collecting area (temperature T2) FLR (T3) Light collecting area (temperature T3) FLRd (T1) Incident surface concentrated light flux region (temperature T1) FLRd (T2) Incident surface collecting light flux region (temperature T2) FLRd (T3) Incident surface collecting light flux region (temperature T3) FP focus
- FIG. 1A is a perspective side view transparently showing a schematic configuration of a surface including an optical axis of the solar cell and the concentrating solar power generation module according to Embodiment 1 of the present invention.
- FIG. 1B is a perspective view showing the outer appearance of the holding portion and the columnar optical member of the solar cell shown in FIG. 1A as viewed obliquely from above.
- Solar cell 210 is condensed with solar cell element 211 that photoelectrically converts sunlight Ls collected by condenser lens 250, and receiver substrate 220 on which solar cell element 211 is placed.
- a columnar optical member 230 having an incident surface 231 on which the solar light Ls is incident and an irradiation surface 232 that is disposed facing the solar cell element 211 and irradiates the solar cell element 211 with the solar light Ls, and is erected on the receiver substrate 220.
- a holding portion 240 that holds the columnar optical member 230.
- the holding portion 240 is separated from the columnar optical member 230 and the frame-shaped abutting frame 241 that is in contact with the side surface 233 of the columnar optical member 230 and has a thickness t in the direction from the incident surface 231 to the irradiation surface 232. And a support body 242 that is disposed and supports the contact frame body 241.
- the side surface 233 of the columnar optical member 230 is inclined so that the incident sunlight Ls is totally reflected in the direction of the irradiation surface 232, and the incident surface 231 of the columnar optical member 230 is caused by the condensed sunlight Ls.
- the collected light flux region FLR is formed so that the incident surface collected light flux region FLRd formed on the incident surface 231 is positioned inside.
- the incident sunlight Ls (collected light flux region FLR) is incident when a positional shift (see FIGS. 4 and 5) occurs with respect to the center (optical axis Lax) of the columnar optical member 230. It is possible to reliably position the surface collection light flux region FLRd within the region of the incident surface 231 to prevent fluctuations in the light collection characteristics of the solar cell 210, and the condensed sunlight Ls is applied to the columnar optical member 230. Since the applied heat can be dispersed to the surrounding space by the side surface 233 and the contact frame body 241, the solar cell 210 having high heat resistance and high reliability with improved light collection efficiency and photoelectric conversion efficiency can be obtained. it can.
- the side surface 233 has an inclination angle ⁇ of 8 degrees to 20 degrees with respect to the vertical direction of the irradiation surface 232 (the optical axis Lax direction, that is, the vertical direction with respect to the light receiving surface of the solar cell element 211). Therefore, the sunlight Ls incident on the columnar optical member 230 can be reliably and accurately totally reflected by the side surface 233 and irradiated onto the solar cell element 211, so that the condensing efficiency and photoelectric conversion efficiency of the solar cell 210 are increased. Can be reliably improved.
- the irradiation surface 232 has a size located inside the solar cell element 211 (outer periphery). Therefore, the sunlight Ls irradiated to the solar cell element 211 from the irradiation surface 232 is surely irradiated only to the solar cell element 211. That is, since unnecessary sunlight Ls that does not contribute to photoelectric conversion can be prevented from being irradiated to the receiver substrate 220, the receiver substrate 220 on which the wiring for the solar cell element 211 is formed is prevented from being burned out and highly reliable solar The battery 210 can be used.
- the columnar optical member 230 can be made of, for example, glass, heat-resistant glass, general transparent resin, or the like. It is desirable to apply a material having characteristics that can withstand the high energy density of the concentrated sunlight Ls. That is, heat-resistant glass that can withstand the temperature rise and sudden temperature change caused by sunlight Ls is particularly desirable, but is not limited thereto.
- the contact frame body 241 has a rectangular shape, and the support bodies 242 are arranged in a columnar shape at the four corners of the contact frame body 241. Therefore, it is possible to align the contact frame body 241 and the columnar optical member 230 with high accuracy, and in the space provided around the solar cell element 211 and the columnar optical member 230 (side surface 233). Since the solar cell element 211 and the columnar optical member 230 can be effectively radiated by the chimney effect, the photoelectric conversion efficiency can be improved.
- the region where total reflection of the side surface 233 occurs is exposed to the space without contacting the contact frame body 241, the heat energy by the sunlight Ls supplied to the columnar optical member 230 is efficiently reduced. It becomes possible to discharge into the space, and the heat resistance of the solar cell 210 (solar cell element 211) can be improved.
- a groove portion 241g is formed in a corner portion (corner portion) inside the abutting frame body 241 (a portion in contact with the columnar optical member 230) so as to correspond to the corner of the columnar optical member 230. That is, since the corners of the columnar optical member 230 are disposed in the space formed by the groove portion 241g, there is no direct contact with the contact frame body 241 and there is no possibility of damage during assembly. Further, since the side surface 233 and the inner side surface of the contact frame body 241 are each formed of a flat surface, they can be contacted with high accuracy and can be positioned with high accuracy.
- the groove portion 241g can be filled with an adhesive resin to improve the adhesive strength between the columnar optical member 230 and the holding portion 240, and the mechanical strength is improved to improve the stability of the columnar optical member 230. Can be made. Further, the minimum light collection region FLRs in which the light collection region FLR is minimum is configured to be positioned on the irradiation surface 232 side with respect to the contact frame 241. Therefore, since the sunlight Ls does not irradiate the side surface 233 on the inner side surface of the contact frame 241, there is no influence on the sunlight Ls. That is, even when the groove portion 241g is filled with the adhesive resin, the light collecting property is not adversely affected.
- the holding unit 240 can be made of, for example, a metal such as aluminum, iron, or stainless steel, or a synthetic resin such as polyethylene. It is desirable to use a metal in consideration of heat dissipation and thermal expansion characteristics. Moreover, it is desirable to use aluminum from a viewpoint of weight reduction and cost reduction.
- An inner resin stopper 221 is formed in a ring shape (frame shape) around the solar cell element 211, and a resin sealing part 225 of a translucent resin is formed inside the inner resin stopper 221. . That is, the inner resin stopper portion 221 is used as a resin stopper when the resin sealing portion 225 is formed by resin sealing between the solar cell element 211 and the irradiation surface 232 with a translucent resin.
- the resin sealing portion 225 can reliably protect the surface of the solar cell element 211 to eliminate the influence from the external environment, and the solar cell 210 having excellent weather resistance can be obtained.
- the translucent resin constituting the resin sealing portion 225 has high light transmissivity and excellent adhesiveness.
- an epoxy resin, a silicone resin, or the like can be applied.
- the resin sealing portion 225 covers the surface of the solar cell element 211 and improves the water resistance and moisture resistance of the solar cell element 211. Further, it is bonded to the columnar optical member 230 (irradiation surface 232) and has an action of fixing the columnar optical member 230.
- an outer resin stopper 222 is formed outside the inner resin stopper 221.
- the outer resin stopper 222 is disposed to adhere and fix the support 242. Therefore, it can be formed only at a position corresponding to the support body 242, but it can also be formed in a ring shape (frame shape) like the outer resin stopper 222.
- frame shape In the case of an annular shape (frame shape), when the resin sealing portion 225 is formed, the translucent resin filled in the inner resin stopper 221 is pushed out from the inner resin stopper 221 by the columnar optical member 230. Since the translucent resin is stopped by the outer resin stopper 222, it is possible to prevent the occurrence of process defects.
- the inner resin stopper 221 and the outer resin stopper 222 are preferably formed of an adhesive synthetic resin.
- an adhesive synthetic resin for example, an epoxy resin, a silicone resin, or the like can be applied.
- the concentrating solar power generation module 201 condenses the sunlight Ls and makes it incident on the solar cell 210, and photoelectrically converts the sunlight Ls collected by the condenser lens 250.
- the concentrating solar power generation module 201 has no fear that the condensing efficiency is lowered when the incident surface collection light flux region FLRd is displaced from the center of the incident surface 231. It is possible to improve the light collection efficiency and the conversion light rate, and to realize high heat resistance and reliability.
- the minimum light collection region FLRs where the light collection region FLR is minimum is configured to be located inside the columnar optical member 230. Therefore, the position of the focal group FPg (see FIG. 3A) by the condensing lens 250 can be positioned inside the columnar optical member 230, and the energy density in the incident surface concentrated light flux region FLRd can be suppressed. That is, for example, when dust adheres to the surface of the incident surface 231, the dust is prevented from burning due to high thermal energy caused by the concentrated sunlight Ls, and the columnar optical member 230 is prevented from being burned out.
- the optical solar power generation module 201 can be obtained.
- the minimum light collection region FLRs is located between the bottom 241b of the contact frame 241 and the irradiation surface 232. That is, since it is possible to cause total reflection on the side surface 233 of the columnar optical member 230 at a position where the columnar optical member 230 is not in contact with the contact frame body 241, reflection loss due to the contact frame body 241 does not occur. It is possible to stabilize the output characteristics of the solar cell 210 by stabilizing the light collection efficiency.
- the size of the incident surface collecting light flux region FLRd can be set by optically calculating the condensing characteristic, size, and distance of the condensing lens 250 with respect to the solar cell 210.
- the size and position of the minimum light collection region FLRs are determined by optically determining the condensing characteristics, size, and distance of the condensing lens 250 with respect to the solar cell 210 and further the size and distance of the columnar optical member 230 with respect to the solar cell element 211. It is possible to calculate and obtain the setting.
- FIG. 2 is a side view conceptually showing characteristics with respect to the sunlight wavelength of the solar cell and the concentrating solar power generation module according to Embodiment 2 of the present invention.
- the wavelength region of sunlight Ls includes a medium / short wavelength region from a short wavelength of 400 nm to an intermediate wavelength of 1000 nm (1 ⁇ m), and a long wavelength region exceeding 1 ⁇ m.
- the sunlight Ls collected by the condenser lens 250 the sunlight Ls in the middle and short wavelength side region is collected near the center of the incident surface 231 and constitutes the middle and short wavelength side concentrated light flux region FLRb.
- the sunlight Ls in the long wavelength side region has a long wavelength side concentrated light flux region FLRc on the medium / short wavelength side concentrated light flux region FLRb and the outer periphery thereof (the outer periphery of the incident surface 231 and the region corresponding to the contact frame 241). Configure.
- the medium / short wavelength side concentrated light flux region FLRb which is the concentrated light flux region formed by the medium / short wavelength side region (400 nm to 1000 nm), is configured to be surely irradiated to the solar cell element 211.
- the medium-short wavelength side light collecting flux region FLRb is incident on the incident surface 231, travels inside the columnar optical member 230, and then totally reflects on the side surface 233.
- the incident surface 231 is configured such that the medium and short wavelength-side concentrated light flux region FLRb is positioned inside the incident surface 231.
- the medium-short wavelength-side concentrated light flux region FLRb is configured to be positioned inside the incident surface 231 by the condenser lens 250.
- the sunlight Ls in the long wavelength region contributes to the photoelectric conversion of the solar cell element 211, and the energy required to contribute to the photoelectric conversion is about two thirds of the incident energy. If it is good. Further, the sunlight Ls in the long wavelength side region has an effect of raising the temperature of the solar cell 210 and lowering the photoelectric conversion efficiency.
- a part of the outer peripheral side of the long wavelength side concentrated light flux region FLRc (the middle short wavelength side concentrated light flux region FLRb), which is the concentrated light flux region formed by the sunlight Ls in the long wavelength side region (greater than 1 ⁇ m).
- the outer peripheral side area FLRcs) is shielded by the contact frame 241 (thickness t). That is, the outer peripheral side region FLRcs of the long wavelength side concentrated light flux region FLRc formed by the sunlight Ls in the long wavelength side region is a region corresponding to the top surface of the contact frame 241 and the thickness t on the outer periphery of the incident surface 231.
- the light is condensed by the condensing lens 250 at a light shielding position.
- the thickness t of the contact frame 241 is set to be a thickness that shields the outer peripheral side region FLRcs of the long-wavelength side concentrated light flux region FLRc formed by the long-wavelength side region of sunlight Ls.
- the design current value of the bottom layer is about 1.8 times larger than that of the top layer and the middle layer, so that it is not necessary to absorb the wavelengths in all regions. Therefore, it is possible to eliminate a temperature increase due to sunlight Ls in the long wavelength side region by providing the top surface of the contact frame 241 and the portion of the thickness t with a light shielding characteristic for the long wavelength side region.
- the incident surface collecting light flux region FLRd corresponding to the middle and short wavelength side region is positioned on the incident surface 231 with high accuracy and is totally reflected by the side surface 233, thereby generating a heat shielding effect. It is possible to prevent the output from being reduced due to the positional deviation of the light flux region FLRd and to ensure the stabilization of the output.
- FIG. 3A is a side view conceptually showing a focus displacement state with respect to sunlight wavelength due to temperature characteristics of a condensing lens in the solar cell and the concentrating solar power generation module according to Embodiment 3 of the present invention.
- FIG. 3B is a plan view conceptually showing a displacement state of the incident light collecting light flux region on the incident surface of the solar cell shown in FIG. 3A.
- the condenser lens 250 is, for example, a Fresnel lens formed of silicone resin.
- the temperature of the silicone resin changes, for example, from 20 ° C. to 40 ° C., for example, the refractive index for a wavelength of 650 nm changes from 1.409 (20 ° C.) to 1.403 (40 ° C.) corresponding to the change in temperature. . Note that the change in refractive index occurs for all wavelengths.
- the collected light flux region FLR when the temperature changes varies according to the temperature. For example, when temperature T1> temperature T2> temperature T3, the collected light beam region FLR (T1) at the temperature T1 ⁇ the collected light beam region FLR (T2) at the temperature T2 ⁇ the collected light beam region FLR (at the temperature T3). T3). Further, the relationship between the incident surface collected light beam region FLRd (T1) at the temperature T1, the incident surface collected light beam region FLRd (T2) at the temperature T2, and the incident surface collected light beam region FLRd (T3) at the temperature T3 is as follows. Incident surface collected light beam region FLRd (T1) ⁇ incident surface collected light beam region FLRd (T2) ⁇ incident surface collected light beam region FLRd (T3).
- the positions of the focal point FP (T1) at the temperature T1, the focal point FP (T2) at the temperature T2, and the focal point FP (T3) at the temperature T3 are the focal point FP (T1) and the focal point in order from the incident surface 231.
- FP (T2) and focus FP (T3). Therefore, the focal point FP (T1), the focal point FP (T2), and the focal point FP (T3) are a set of focal points FP, and constitute a focal point group FPg.
- the focal point FP causes a focus shift Sfp, and the condensing characteristic of the condenser lens 250 is changed. Further, the incident surface collection light flux region FLRd on the incident surface 231 changes under the influence of the change in the refractive index.
- the diameter of the condenser lens 250 is, for example, 30 cm, and the distance between the condenser lens 250 and the solar cell element 211 is, for example, 30 cm.
- the incident surface collecting light flux region FLRd (T1) is about 6.5 mm in diameter at a temperature T1 (for example, 40 ° C.), and the incident surface collecting light flux region FLRd (T2) is at a temperature T2 (for example, 30 ° C.).
- T1 for example, 40 ° C.
- T2 for example, 30 ° C.
- the incident surface concentrated light flux region FLRd (T3) has a diameter of about 7.5 mm, the length w of the side of the rectangular incident surface 231 is 9.4 mm, for example.
- the incident light collecting light flux region FLRd is always incident on the inside of the incident surface 231 even if there is a change in the light condensing characteristic due to the temperature change, so that the fluctuation of the light condensing characteristic can be substantially prevented. It becomes possible.
- the focus shift Sfp from the focus FP (T1) to the focus FP (T3) at this time was about 10 mm. Therefore, the distance from the bottom 241b of the contact frame 241 to the irradiation surface 232 may be at least 10 mm or more.
- the focal point group FPg formed by the focal point FP of the condensing lens 250 that is displaced in accordance with the temperature change of the condensing lens 250 includes the bottom 241b of the contact frame 241 and the irradiation surface 232. It is as a structure located between. Therefore, when the focal point is displaced due to the temperature change of the condenser lens 250, total reflection on the side surface 233 can be generated at a position where the condenser lens 250 is not in contact with the contact frame body 241, thereby stabilizing the light collection efficiency. Thus, the output characteristics of the solar cell 210 can be stabilized.
- the focal point FP is located between the bottom portion 241b of the contact frame 241 and the irradiation surface 232, the focal point FP is prevented from moving to a position corresponding to the outer periphery of the holding portion 240, and sunlight Even when Ls irradiates the receiver substrate 220 exceptionally, it is possible to suppress the thermal energy density of the collected light flux region FLR on the surface of the receiver substrate 220, thereby preventing the temperature increase of the receiver substrate 220. And burnout can be avoided.
- FIG. 4 is a tracking diagram conceptually showing the relationship between the tracking state when the concentrating photovoltaic power generation module according to Embodiment 4 of the present invention is subjected to intermittent tracking control and the incident surface concentrated light flux region formed on the incident surface.
- It is a state conceptual diagram, (A) is the state where the concentrating solar power generation module is directly facing the sunlight, (B) is moving the concentrating solar power generation module ahead of the sunlight (C) shows a state where the moved concentrating solar power generation module faces again by the movement of sunlight, and (D) shows that the concentrating solar power generation module is delayed by the movement of sunlight.
- A is the state where the concentrating solar power generation module is directly facing the sunlight
- B is moving the concentrating solar power generation module ahead of the sunlight
- C shows a state where the moved concentrating solar power generation module faces again by the movement of sunlight
- (D) shows that the concentrating solar power generation module is delayed by the movement of sunlight.
- the concentrating solar power generation module 201 (solar cell 210) according to the present embodiment is configured to face the sunlight Ls by so-called tracking control. That is, since the incident direction of sunlight Ls with respect to the concentrating solar power generation module 201 (incident surface 231) fluctuates along the solar moving direction SSD, the concentrating solar power generation module 201 is controlled by the tracking control unit 205. It is configured to be intermittently driven to rotate with respect to the sun azimuth and to be intermittently driven to tilt with respect to the solar altitude. In FIG. 4, only the state of the turning drive is shown for easy understanding, but the same drive control is executed for the tilting drive as well as the turning drive.
- the tracking control for the concentrating solar power generation module 201 is executed at specified time intervals. That is, the tracking control by the tracking control unit 205 is a so-called intermittent tracking control mode. Note that the shape of the concentrating solar power generation module 201 (the diameter of the condensing lens 250 and the interval between the condensing lens 250 and the solar cell element 211) is the same as that in the third embodiment.
- Intermittent tracking control can be executed as follows, for example.
- the concentrating solar power generation module 201 located at a position delayed with respect to the sunlight Ls (position immediately before the same figure (A)) is driven to turn in the direction of the arrow Rot so as to face the sunlight Ls.
- the state ((A) in the figure) is passed, and the sunlight Ls is moved to the overtaken position and fixed ((B) in the figure).
- the turning angle when the concentrating solar power generation module 201 passes the sunlight Ls is, for example, +0.05 degrees at the maximum angle with respect to the directly facing position.
- the swivel deviation dw of the incident surface collected light beam region FLRd is 1 mm with respect to the time of facing.
- the sunlight Ls faces the concentrating solar power generation module 201 moved to the position advanced with respect to the sunlight Ls ((B) in the same figure) while being incident again on the incident surface collection light flux region FLRd (same as above). It passes through the figure (C)) and moves to a position (Drawing (D)) overtaking the concentrating solar power generation module 201.
- the turning angle when the sunlight Ls passes the concentrating solar power generation module 201 is set to, for example, ⁇ 0.05 degrees at the maximum angle with respect to the directly facing position. Therefore, on the opposite side to the time when the concentrating solar power generation module 201 passes the sunlight Ls, the swivel deviation dw of the incident surface collection light flux region FLRd is 1 mm with respect to the time of facing.
- the concentrating solar power generation module 201 has overtaken the concentrating solar power generation module 201 or when the concentrating solar power generation module 201 has overtaken the concentrating solar power generation module 201, Since the swivel deviation dw with respect to the time when the incident surface concentrated light flux region FLRd is directly facing can be set to a sufficiently small value with respect to the size of the incident surface 231, an intentional positional deviation by tracking control (swivel control) is possible. Even when the operation is executed, the light collection characteristic does not fluctuate and the light collection efficiency is not lowered.
- the tilt angle in tilt drive can be ⁇ 0.025 degrees at the maximum angle, and the tilt shift can be 0.5 mm. That is, since the tilt deviation of the incident surface collected light beam region FLRd at the maximum tilt angle with respect to the front-facing time can be set to a sufficiently small value with respect to the size of the incident surface 231, the tracking control (tilt control) Even when an intentional positional shift operation by control) is executed, the light collection efficiency is not lowered.
- the position of the solar cell 210 (concentrating solar power generation module 201) is advanced to the destination of the sun on the solar orbit every specified time.
- the incident surface collecting light flux region FLRd is configured to be located inside the incident surface 231.
- FIG. 5 shows an incident surface formed on a setting angle shift and an incident surface when an assembly error occurs between the condensing lens and the solar cell of the concentrating solar power generation module according to Embodiment 5 of the present invention. It is explanatory drawing which illustrates the relationship with a condensing light beam area
- the positional deviation between the incident light collection light flux region FLRd formed on the incident surface 231 and the center (optical axis Lax) of the incident surface 231 is not limited to the above-described operation but is caused by an assembly error in the manufacturing process. May occur. That is, high-precision parallelism is required between the solar cell 210 (solar cell element 211) and the condenser lens 250. However, the condensing lens 250 may be assembled as the concentrating solar power generation module 201 in a state in which the set angle deviation ⁇ is generated by deviating from the original parallel position with respect to the solar cell 210.
- the sunlight Ls (collected light flux region FLR) collected by the condensing lens 250 is displaced with respect to the incident surface 231.
- the incident surface collection light beam region FLRds that is displaced in the lateral direction is formed on the incident surface 231 with respect to the incident surface light collection beam region FLRd having no positional displacement.
- the set angle deviation ⁇ is a maximum value, for example, 0.1 degree.
- the misaligned incident surface collective light flux region FLRds is displaced by a maximum of 1 mm from the original incident collective light flux region FLRd. That is, even when the condensing lens 250 is displaced with respect to any direction, the incident surface collecting light flux region FLRds can be positioned inside the incident surface 231. Therefore, it is possible to obtain a highly reliable concentrating solar power generation module 201 with improved condensing efficiency and conversion light rate without reducing condensing efficiency.
- FIG. 6A is a process diagram showing a substrate preparation step of preparing a receiver substrate on which a solar cell is placed by the solar cell manufacturing method according to Embodiment 6 of the present invention.
- FIG. 6B is a process diagram showing a resin stopper forming step of forming an inner resin stopper and an outer resin stopper in the solar cell manufacturing method according to Embodiment 6 of the present invention.
- FIG. 6C is a process diagram showing a support fixing process for fixing the support of the holding unit to the receiver substrate in the solar cell manufacturing method according to Embodiment 6 of the present invention.
- FIG. 6D is a process diagram showing a translucent resin injecting step of injecting a translucent resin into the inside resin stopper in the solar cell manufacturing method according to Embodiment 6 of the present invention.
- FIG. 6E is a process chart showing a columnar optical member mounting step in which the columnar optical member is brought into contact with the holding portion and the irradiation surface is mounted on the translucent resin in the solar cell manufacturing method according to Embodiment 6 of the present invention. It is.
- the solar cell manufacturing method includes a solar cell element 211 that photoelectrically converts sunlight Ls collected by the condensing lens 250, a receiver substrate 220 on which the solar cell element 211 is placed, A columnar optical member 230 having an incident surface 231 on which the incident sunlight Ls is incident and an irradiation surface 232 that is disposed facing the solar cell element 211 and irradiates the solar cell element 211 with the sunlight Ls; A holding unit erected on the receiver substrate 220 having a frame-shaped contact frame body 241 that is in contact with the side surface 233 and a support body 242 that is disposed away from the columnar optical member 230 and supports the contact frame body 241.
- the solar cell 210 provided with the part 240 is manufactured.
- the solar cell manufacturing method includes a substrate preparation process, a resin stopper forming process, a support fixing process, a translucent resin injection process, a columnar optical member mounting process, and a resin sealing part forming process. Prepare.
- substrate 220 which mounted the solar cell element 211 is prepared (board
- an adhesive resin is applied to the receiver substrate 220, and a support 242 is placed outside the inner resin stopper 221 and the inner resin stopper 221 into which a translucent resin for sealing the solar cell element 211 is injected.
- the outer resin stopper 222 to be fixed is formed (resin stopper forming step, FIG. 6B).
- the inner resin stopper 221 is formed in a ring shape (frame shape) around the solar cell element 211 because a translucent resin for sealing the solar cell element 211 is injected in a later step. Further, the outer resin stopper 222 is formed only at a position corresponding to the support 242 because the support 242 is bonded and fixed in a later step.
- the outer resin stopper 222 is formed in a ring shape (frame shape) around the inner resin stopper 221 and the translucent resin injected into the inner resin stopper 221 expands more than necessary from the inner resin stopper 221. It is also possible to adopt a form that prevents this. Further, when the outer resin stopper 222 is annular, an effect of blocking moisture that enters along the surface of the receiver substrate 220 is produced.
- the support 242 is fixed to the receiver substrate 220 by bonding the support 242 to the outer resin stopper 222 and curing the adhesive resin (support fixing process, FIG. 6C).
- the outer resin stopper 222 can be cured.
- the inner resin stopper 221 is also cured in conjunction with the outer resin stopper 222.
- a translucent resin is injected inside the inner resin stopper 221 (translucent resin injection step, FIG. 6D).
- an epoxy resin, a silicone resin, or the like can be applied as the translucent resin.
- the translucent resin is cured to form the resin sealing portion 225 (resin sealing portion forming step, not shown).
- the resin sealing portion forming step By heating the translucent resin to an appropriate temperature, it is possible to perform a defoaming treatment simultaneously with curing, and the resin sealing portion 225 having excellent translucency can be formed.
- the irradiation surface 232 Since the irradiation surface 232 is placed and brought into contact with the light-transmitting resin, the irradiation surface 232 is adhered by the light-transmitting resin of the resin sealing portion 225, and the columnar optical member 230 is surely attached to the solar cell element 211. And it is fixed with high precision. In addition, it is possible to secure further mechanical strength by injecting adhesive resin into the groove portion 241g and bonding and fixing the columnar optical member 230 and the holding portion 240 with the groove portion 241g.
- the incident surface collected light beam region FLRd is incident. It is located within the area of the surface 231 to prevent fluctuations in the light collection characteristics, and the heat applied to the columnar optical member 230 by the condensed sunlight Ls is dispersed by the contact frame 241 so that the light collection efficiency and A highly heat-resistant and highly reliable solar cell 210 with improved photoelectric conversion efficiency can be manufactured with high productivity (that is, easily and with high accuracy) and at low cost.
- FIG. 7 is a cross-sectional view showing a solar cell and a concentrating solar power generation module according to Embodiment 7 of the present invention.
- FIG. 8 is an enlarged plan view showing a state in which the solar cell shown in FIG. 7 is enlarged from the condenser lens side.
- FIG. 9 is an enlarged cross-sectional view showing a cross section in the direction of arrows YY in FIG. Note that the cross-sectional view of the solar cell in FIG. 7 is a cross section in the direction of arrows XX in FIG.
- solar cell element 311 that photoelectrically converts sunlight Ls collected by condenser lens 342 (sunlight Lsa, sunlight Lsb), and solar cell element 311 are placed.
- the solar cell 310 includes a receiver substrate 320 and a resin sealing portion 373 that seals the solar cell element 311 with resin.
- the sunlight Lsa is sunlight that is normally condensed by the condenser lens 342 and is directly incident on the solar cell element 311. Further, the sunlight Lsb is collected by the condenser lens 342, but cannot be directly incident on the solar cell element 311 due to the influence of the lens end portion, the wavelength region (particularly, the short wavelength region), and the like. Sunlight that travels while being reflected inside the light guide path (columnar optical member 370) and is irradiated to the solar cell element 311 by being condensed on the incident surface 370f (condensing region Af) of the optical member 370. . That is, the sunlight Lsb is sunlight that has been a loss in the conventional technique (see FIG. 13).
- the solar cell 310 includes a columnar optical member 370 that constitutes a light guide path that guides the concentrated sunlight Ls to the solar cell element 311, and a holding wall 372 w that holds the columnar optical member 370. And an optical holding unit 372 placed on the receiver substrate 320 so as to cover the unit 373.
- a light collecting path (columnar optical member 370) having high positional accuracy and stability is obtained, and a light collecting characteristic capable of collecting sunlight Ls with high accuracy in a wide wavelength region is obtained.
- the solar cell 310 having high heat resistance, high reliability, and high weather resistance, which improves power generation efficiency and power generation power by reducing the power generation efficiency and preventing temperature rise caused by the positional deviation of the concentrated sunlight Ls. It becomes possible.
- the receiver substrate 320 is connected to a desired wiring (an electrode (not shown) of the solar cell element 311) via a suitable insulating layer on a metal base base such as an aluminum plate or a copper plate, and is connected to the outside.
- a connection pattern (not shown) for connecting the solar cells 310 in series or in parallel is formed.
- the current generated by the solar cell element 311 is appropriately taken out of the solar cell 310 by the wiring formed on the receiver substrate 320. Since the wiring formed on the receiver substrate 320 needs to ensure highly reliable insulation, for example, a connection pattern formed of copper foil is covered with an insulating film such as an organic material for insulation. is there.
- the columnar optical member 370 has an optical path inclined surface 370 s for collecting sunlight Ls on the solar cell element 311, and the holding wall 372 w is a holding inclined surface aligned with the optical path inclined surface 370 s.
- the columnar optical member 370 can be aligned with the optical holding portion 372 in a self-aligning manner, and the columnar optical member 370 can be held with high accuracy by the holding wall 372w.
- the member 370) can be positioned with high accuracy, and the light collecting characteristics can be improved.
- the columnar optical member 370 is made of, for example, heat-resistant glass and has a refractive index of about 1.5, for example.
- the width of the incident surface 370f (condensing region Af) of the columnar optical member 370 on which the sunlight Ls is condensed is the short wavelength light most refracted among the sunlight Lsb refracted at the end of the condenser lens 342.
- the size is such that about 400 nm of sunlight can be incident.
- the irradiation surface 370r of the light guide (columnar optical member 370) on which the solar light Ls is irradiated to the solar cell element 311 is an effective light receiving surface of the solar cell element 311 so that the irradiation to the solar cell element 311 can be performed efficiently. It is formed in the same size as the region. Therefore, the columnar optical member 370 includes an optical path inclined surface 370s that tapers from the incident surface 370f to the irradiation surface 370r.
- the angle of the optical holding portion 372 (holding wall 372w) with respect to the receiver substrate 320 is 45 ° or more, and the incident solar light Lsb is totally reflected to irradiate the solar cell element 311.
- the height Hp of the columnar optical member 370 from the receiver substrate 320 is the angle of the inclined surface of the optical holding portion 372, the size of the area of the irradiation surface 370r corresponding to the area of the solar cell element 311 (effective light receiving surface region), It can be determined by the size of the incident surface 370f of the columnar optical member 370.
- the size of the columnar optical member 370 is the area of the incident surface 370f on which the sunlight Ls is incident without loss, the holding wall 372w (holding inclination) of the optical holding unit 372 that totally reflects the sunlight Ls and irradiates the solar cell element 311. Surface) from the receiver substrate 320 and the area of the irradiation surface 370r.
- a metal film such as Al, Ag, Ni or the like is deposited on the optical path inclined surface 370s of the columnar optical member 370 by vacuum deposition or sputtering. You may provide the reflective surface formed by the above.
- the columnar optical member 370 causes the sunlight Lsa normally condensed by the condensing lens 342 to directly enter the solar cell element 311 and collect it on the incident surface 370f by the condensing lens 342.
- the emitted sunlight Lsb can be allowed to travel while being multiple-reflected by the light guide path (columnar optical member 370) and incident on the solar cell element 311, and the power generation efficiency of the solar cell 310 can be increased.
- the optical holding unit 372 is brought into contact with a metal base base (not shown) included in the receiver substrate 320 and bonded to the receiver substrate 320 by the bonding unit 321. That is, the optical holding portion 372 is directly bonded to the receiver substrate 320 (base base) in a state where an appropriate contact area is ensured.
- the heat generated in the receiver substrate 320 (solar cell element 311) due to the concentrated sunlight Ls can be efficiently conducted to the optical holder 372 formed of metal, and the optical holder
- the heat conducted to 372 is effectively dissipated by the fins 372h having an increased heat dissipating area, so that it is possible to efficiently dissipate heat caused by the sunlight Ls collected on the solar cell element 311.
- the power generation efficiency and reliability of the solar cell 310 can be improved.
- the optical holding portion 372 is preferably formed of, for example, metal. By forming it with a metal, the optical holding portion 372 having excellent heat dissipation can be easily and inexpensively formed with good mass productivity.
- the optical holding portion 372 includes comb-shaped fins 372h on the outer peripheral side surface, for example. Therefore, it is possible to further improve the heat dissipation characteristics, and it is possible to further improve the power generation efficiency and reliability.
- the fin 372h has a shape that is inclined from the base to the tip in a direction away from the receiver substrate 320 (upward), and further improves heat dissipation.
- the columnar optical member 370 is a quadrangular column, and the optical holding unit 372 includes a groove-shaped notch 372g that surrounds the axial corner 370c of the quadrangular column. Therefore, it is possible to prevent the optical holding portion 372 from being damaged at the axial corner portion 370c of the columnar optical member 370, and to place the columnar optical member 370 on the optical holding portion 372 reliably and with high accuracy.
- the notched portion 372g can surely degas and fill the sealing resin 373r (see FIG. 10C) filled between the columnar optical member 370 and the optical holding portion 372.
- the optical path (columnar optical member 370) is defined (positioned) with high accuracy, and a high-quality light guiding path is formed in which bubbles are not mixed between the optical path inclined surface 370s and the holding wall 372w or in the resin sealing portion 373. be able to.
- the optical holding portion 372 is preferably formed so that the height Hh from the receiver substrate 320 is higher than the center of gravity position Wb of the columnar optical member 370.
- the center of gravity of the columnar optical member 370 can be reliably and reliably held by the optical holding portion 372. Therefore, it is possible to prevent the columnar optical member 370 from shaking or falling by the optical holding portion 372, and to suppress the shaking of the concentrated sunlight Ls and to perform highly reliable power generation, thereby improving the reliability of the solar cell 310. Can be improved.
- the columnar optical member 370 can be brought into close contact with the optical holding portion 372, and the columnar optical member 370 can be stably placed on the optical holding portion 372. Since it becomes possible, productivity can be improved.
- the resin sealing portion 373 is composed of an insulating sealing resin 373r filled between the solar cell element 311 and the optical holding portion 372.
- a transparent silicone resin a columnar optical member
- the solar cell element 311 can be irradiated with sunlight Ls that has passed through 370.
- the resin sealing portion 373 is thinner than the surrounding region between the columnar optical member 370 and the solar cell element 311. That is, the thickness Tr in the surrounding region is formed to be thicker than the thickness Ts between the columnar optical member 370 and the solar cell element 311.
- the surface (irradiation surface 370r) of the columnar optical member 370 facing the solar cell element 311 can be reliably brought close to the solar cell element 311 (effective light receiving surface region). It is possible to effectively irradiate the solar cell element 311 with the emitted sunlight Ls.
- the heat resistance can be improved and the solar cell 310 having high reliability and weather resistance can be obtained.
- the sunlight Ls is configured to be focused on the solar cell element 311 by the tracking mechanism.
- a positional deviation may occur due to the occurrence of a tracking error or an alignment error of the optical system, and the focused spot may be shifted. That is, the solar cell 310 may be irradiated with the misaligned sunlight Lss.
- tracking error such as tracking error
- the optical holding unit 372 has a light collection region Af (columnar optical member 370) set for sunlight Ls (sunlight Lsa, sunlight Lsb) collected toward the solar cell element 311 (effective light receiving surface region). ), The sunlight Lss can be reflected when the sunlight Lss is generated.
- the wiring formed on the surface of the receiver substrate 320 is composed of an organic member having low heat resistance. Therefore, if sunlight Lss is irradiated, the organic member is damaged, and thus the wiring is damaged. And the reliability of the solar cell 310 may be reduced.
- the receiver substrate 320 around the solar cell element 311 is covered by the optical holding portion 372 (and the resin sealing portion 373), the sunlight Lss is directly irradiated on the receiver substrate 320 (wiring). Therefore, it is possible to prevent damage to the wiring and the like. Therefore, it is possible to suppress the temperature rise of the surface of the receiver substrate 320 and to burn out the members (wiring, insulating film, etc.) disposed on the surface of the receiver substrate 320. Can be prevented.
- the solar cell 310 can be made highly efficient and inexpensive with good reliability and weather resistance with improved heat resistance.
- the optical holding unit 372 can effectively reflect sunlight Lss by using, for example, metal.
- the solar cell element 311 is made of an inorganic material such as Si, GaAs, CuInGaSe, CdTe, for example.
- the solar cell element 311 has various structures such as a single junction solar cell element, a monolithic multi-junction solar cell element, and a mechanical stack type in which various solar cell solar cell elements having different wavelength sensitivity regions are connected. It is possible to apply.
- the external size of the solar cell element 311 is preferably about several mm to about 20 mm from the viewpoints of reduction of the solar cell material to be used, ease of processing, ease of process, simplification, and the like.
- an appropriate antireflection film or the like may be provided on the surface of the solar cell element 311. Further, a UV reflection film, an infrared reflection film, or the like that reflects sunlight having a wavelength other than the sensitivity wavelength region of the solar cell element 311 may be provided.
- the concentrating solar power generation module 340m includes a condensing lens 342 that condenses sunlight Ls (sunlight Lsv), and sunlight Ls (sunlight Lsa) collected by the condensing lens 342.
- the solar cell 310 solar cell element 311) that photoelectrically converts sunlight Lsb).
- the condensing lens 342 is configured to face the sun by the action of a tracking mechanism (not shown). Therefore, the sunlight Lsv is incident in a direction perpendicular to the incident surface of the condenser lens 342.
- the condensing lens 342 is configured to refract the sunlight Lsv and condense it on the solar cell element 311 (in this embodiment, the incident surface 370f as the condensing region Af).
- a three-junction solar cell element composed of InGaP / GaAs / Ge, AlGaAs / It is desirable to use a solar cell element made of Si or a monolithic multi-junction solar cell element.
- the surface of the solar cell element 311 that photoelectrically converts sunlight Ls is flat, the incident surface of the condensing lens 342, the incident surface 370f of the columnar optical member 370, irradiation It is arranged in parallel with the surface 370r.
- the condensing lens 342 examples include a biconvex lens, a plano-convex lens, and a Fresnel lens. From the viewpoint of weight, cost, ease of handling in the usage environment, etc., a Fresnel lens having a flat entrance surface for receiving sunlight Ls and an exit surface for irradiating solar cell element 311 with sunlight Ls having a substantially triangular cross section. It is desirable to have a shape. Note that the condensing lens 342 may be formed in an array (see FIG. 11) in which a plurality of the same optical systems are arranged and integrally molded.
- a material of the condensing lens 342 As a material of the condensing lens 342, a material having a high transmittance in the sensitivity wavelength light of the solar cell element 311 and having weather resistance is preferable. For example, it is possible to apply a thin glass generally used for a normal solar cell module (solar power generation system), weather resistant grade acrylic, polycarbonate, or the like.
- the material of the condensing lens 342 is not limited to these, You may make these materials into the multilayer structure.
- an appropriate ultraviolet absorber may be added to these materials for the purpose of preventing ultraviolet degradation of the condenser lens 342 itself and other members.
- an optical holding portion 372 is prepared by molding a metal (optical holding portion preparation step). Note that the shape of the optical holding portion 372 is as described in Embodiment 7, and thus the description thereof is omitted as appropriate.
- the holding wall 372w (holding inclined surface) having the same inclination angle as the optical path inclined surface 370s corresponding to the optical path inclined surface 370s of the columnar optical member 370 is formed inside the metal block. Further, a notch 372g is formed corresponding to the axial corner 370c of the columnar optical member 370. In addition, a space that covers the resin sealing portion 373 is formed adjacent to the surface that contacts the receiver substrate 320. Further, the fin 372h is formed on the outer periphery of the optical holding portion 372.
- FIG. 10A is a process diagram for explaining a solar cell manufacturing method according to Embodiment 8 of the present invention, and shows a state in which a solar cell element is placed on a receiver substrate in a cross section in the direction of arrows XX in FIG. Show.
- the solar cell element 311 is mounted on the receiver substrate 320 (solar cell device mounting step).
- FIG. 10B is a process diagram for explaining the solar cell manufacturing method according to Embodiment 8 of the present invention, and shows a state in which the optical holding unit is placed on the receiver substrate in a cross section in the direction of arrows XX in FIG. Show.
- the bonding portion 321 is formed on the receiver substrate 320 in correspondence with the position where the optical holding portion 372 is arranged on the outer periphery of the solar cell element 311 (bonding portion forming step).
- a metal frame or a plastic frame can be formed and arranged as the bonding portion 321, but it is desirable to appropriately arrange a resin or an adhesive that can bond the optical holding portion 372.
- the bonding unit 321 is configured to bond the optical holding unit 372 to the receiver substrate 320 on the side surface of the optical holding unit 372 so that the optical holding unit 372 can be brought into direct contact with a base base (not shown) of the receiver substrate 320. Placed in. Note that, when an adhesive having high thermal conductivity is applied, the adhesive portion 321 may be interposed between the receiver substrate 320 and the optical holding portion 372.
- the optical holding portion 372 is aligned with the bonding portion 321 and placed in contact with the receiver substrate 320 (optical holding portion arranging step). At this time, the optical holding unit 372 is mounted so that the center position of the optical holding unit 372 (corresponding to the center position of the irradiation surface 370r) formed by the holding wall 372w and the center of the solar cell element 311 (effective light receiving surface region) coincide. Put.
- FIG. 10C is a process diagram for explaining the solar cell manufacturing method according to Embodiment 8 of the present invention, in which the sealing resin is injected into the space formed between the optical holder and the receiver substrate in FIG. Shown in section in the direction of arrow XX.
- the injection amount of the sealing resin 373r is such that when the columnar optical member 370 is placed, the sealing resin 373r fills the gap between the columnar optical member 370 and the optical holding portion 372, and the optical holding portion 372 (notch portion). 372g) is sufficient as long as it does not leak, and an appropriate amount obtained in advance is injected.
- FIG. 10D is a process diagram for explaining the solar cell manufacturing method according to Embodiment 8 of the present invention, and shows a state in which the columnar optical member is placed on the optical holding unit in the direction of the arrows XX in FIG. It shows with.
- the columnar optical member 370 is placed on the optical holding portion 372 (holding wall 372w) (optical member placing step), and is stored in a vacuum chamber for defoaming (bubbles) Defoaming step). Since the notch portion 372g formed in the optical holding portion 372 serves as a bubble discharge path, reliable defoaming can be performed by a simple process.
- the columnar optical member 370 Since the pressure of the sealing resin 373r is reduced by performing defoaming in the bubble defoaming step, the columnar optical member 370 is pressed against the holding wall 372w by its own weight, and is self-aligned toward the solar cell element 311 with high accuracy. Inserted. Further, since the sealing resin 373r is filled between the columnar optical member 370 and the optical holding portion 372 and acts as a lubricant, the frictional resistance between the columnar optical member 370 and the optical holding portion 372 is reduced. While protecting the surface of the columnar optical member 370, it is possible to more smoothly place (couple) it on the optical holding portion 372.
- the sealing resin 373r is cured to form the resin sealing portion 373, and the columnar optical member 370 and the optical holding portion 372 are closely attached and fixed (resin curing step / columnar optical member fixing step). ).
- the solar cell element 311 that photoelectrically converts the sunlight Ls collected by the condenser lens 342 and the receiver substrate 320 on which the solar cell element 311 is placed.
- the present invention relates to a solar cell manufacturing method for manufacturing a solar cell 310 that includes a holding wall 372 w to hold and an optical holding portion 372 that covers a resin sealing portion 373 and is placed on a receiver substrate 320.
- the solar cell manufacturing method includes an optical holding unit preparation step of forming a metal to prepare an optical holding unit 372, and the optical holding unit 372 on the receiver substrate 320 on the outer periphery of the solar cell element 311.
- the optical holding portion 372 and the columnar optical member 370 can be positioned with high accuracy by a simple process, and the light guide path (columnar optical member 370) and the optical holding for effectively guiding the sunlight Ls with high accuracy. Since the portion 372 can be easily formed, the light collection efficiency and the generated power are improved by improving the light collecting characteristics and heat dissipation, and preventing the reduction of the power generation efficiency and the temperature rise caused by the positional deviation of the collected sunlight Ls. It is possible to manufacture the solar cell 310 with improved heat resistance, reliability, and weather resistance at a low cost with high productivity.
- the concentrating solar power generation unit according to the present embodiment will be described.
- the concentrating solar power generation unit according to the present embodiment is configured by arranging a plurality of concentrating solar power generation modules 340m including the solar cell 310 described in the seventh embodiment.
- the code at 7 is applied as it is.
- FIG. 11 is a perspective view schematically showing a configuration of a concentrating solar power generation unit according to Embodiment 9 of the present invention.
- the concentrating solar power generation unit 340 includes a long frame 344 and a plurality of concentrating solar power generation modules 340m arranged along the long frame 344. Note that the concentrating solar power generation module 340m can be made independent by disposing the concentrating solar power generation module 340m in an individual frame different from the long frame 344.
- the concentrating solar power generation module 340m includes, for example, a concentrating lens 342 of about 30 cm square, and the concentrating solar power generation unit 340 includes, for example, 5 ⁇ 1 (five) concentrating solar power generation modules 340m. It is possible to make it the structure provided with. At this time, the concentrating solar power generation unit 340 constitutes a light receiving surface of about 30 cm ⁇ 150 cm, for example.
- the concentrating solar power generation module 340m is connected in series or in parallel with an appropriate number in order to generate necessary power.
- seven concentrating solar power generation units 340 are juxtaposed to form a concentrating solar power generation system (concentrating solar power generation device).
- a concentrating solar power generation system configured by a plurality of concentrating solar power generation units 340 is supported by a support column 381 and is moved in a horizontal direction by a tracking mechanism unit (not shown).
- the condensing lens 342 (incident surface), which is automatically driven in the direction of tracking the sun by the rotation Roth and the rotation Rotv in the vertical direction, is arranged on the surface of the concentrating solar power generation module 340m with respect to the sunlight Lsv
- the configuration is oriented in the vertical direction.
- the concentrating solar power generation unit 340 according to the present embodiment can be applied to a concentrating solar power generation system having a high concentration ratio. That is, the concentrating solar power generation module 340m according to the present invention can constitute a highly efficient and inexpensive tracking concentrating solar power generation system with good reliability and weather resistance.
- the solar cell 310 is not burned out, and a highly reliable tracking and concentrating solar power generation system can be obtained.
- the tracking mechanism unit (tracking drive system) has an azimuth axis for directing the condenser lens 342 (incident surface) to the sun's azimuth and a tilt axis for tilting the condenser lens 342 (incident surface) to the sun's altitude. Therefore, it is possible to track the sun with high accuracy.
- a motor and a speed reducer are used to rotate a gear at a predetermined rotational speed to drive in a predetermined direction
- a hydraulic pump and a hydraulic cylinder are used to adjust the cylinder to a predetermined length.
- There is a method of driving in a predetermined direction and either method may be used.
- the solar orbit is calculated in advance by a clock mounted inside the tracking drive system that controls the operation of the tracking drive system, and the concentrating solar power generation module 340m (concentrating solar power generation unit 340) is oriented in the direction of the sun.
- solar tracking methods such as a method of controlling the sun to be directed, a method of attaching a solar sensor such as a photodiode to the tracking drive system and monitoring and controlling the sun direction as needed. good.
- the concentrating solar power generation unit 340 includes a plurality of concentrating solar power generation modules 340m arranged along the elongated frame 344.
- a concentrating solar power generation unit 340 with improved heat generation efficiency and power generation and improved heat resistance, reliability, and weather resistance. I will provide a.
- the elongate frame 344 and the plurality of concentrating solar power generation modules 340m arranged along the long frame 344 are provided. Therefore, it is possible to obtain a light condensing characteristic capable of concentrating sunlight Ls with high accuracy in a wide wavelength region by securing a light guiding path having high positional accuracy and stability, improving the light condensing characteristic and heat dissipation, and collecting light. In addition, it is possible to improve the power generation efficiency and the generated power by reducing the power generation efficiency and the temperature rise caused by the positional deviation of the sunlight Ls, thereby improving the heat resistance, reliability, and weather resistance.
- the present invention relates to a solar cell that includes a solar cell element that photoelectrically converts the concentrated sunlight and a columnar optical member that irradiates the solar cell element with the concentrated sunlight, and a concentrating type that includes such a solar cell.
- the present invention can be applied to a solar power generation module and a solar cell manufacturing method for manufacturing such a solar cell.
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Abstract
Description
205 追尾制御部
210 太陽電池
211 太陽電池素子
220 レシーバ基板
221 内側樹脂止め部
222 外側樹脂止め部
225 樹脂封止部
230 柱状光学部材
231 入射面
232 照射面
233 側面
240 保持部
241 当接枠体
241b 底部
241g 溝部
242 支持体
250 集光レンズ
FLR 集束光領域
FLRb 中短波長側集光束領域
FLRc 長波長側集光束領域
FLRcs 外周側領域
FLRd 入射面集光束領域
FLRs 最小集光束領域
FLR(T1) 集光束領域(温度T1)
FLR(T2) 集光束領域(温度T2)
FLR(T3) 集光束領域(温度T3)
FLRd(T1) 入射面集光束領域(温度T1)
FLRd(T2) 入射面集光束領域(温度T2)
FLRd(T3) 入射面集光束領域(温度T3)
FP 焦点
FPg 焦点群
FP(T1) 焦点(温度T1)
FP(T2) 焦点(温度T2)
FP(T3) 焦点(温度T3)
Lax 光軸
Ls 太陽光
Sfp 焦点ズレ
SSD 太陽移動方向
t 厚さ
α 設定角度ズレ
θ 傾斜角(側面233の傾斜)
310 太陽電池
311 太陽電池素子
320 レシーバ基板
321 接着部
340 集光型太陽光発電ユニット
340m 集光型太陽光発電モジュール
342 集光レンズ
344 長尺状フレーム
370 柱状光学部材(導光路)
370c 軸方向角部
370f 入射面
370r 照射面
370s 光路傾斜面
372 光学保持部
372g 切り欠き部
372h フィン
372w 保持壁(保持傾斜面)
373 樹脂封止部
373r 封止樹脂
381 支柱
Af 集光領域
Hh、Hp 高さ
Lax 光軸
Ls、Lsa、Lsb、Lss 太陽光
Roth 水平方向回転
Rotv 垂直方向回転
Tr、Ts 厚さ
Wb 重心位置
図1Aないし図3Bに基づいて、本実施の形態に係る太陽電池および集光型太陽光発電モジュールについて説明する。
図2に基づいて、本実施の形態に係る太陽電池および集光型太陽光発電モジュールについて説明する。本実施の形態に係る太陽電池および集光型太陽光発電モジュールの基本的な構成は実施の形態1の場合と同様であるので、適宜符号を援用し、主に異なる事項について説明する。
図3Aおよび図3Bに基づいて、本実施の形態に係る太陽電池および集光型太陽光発電モジュールについて説明する。本実施の形態に係る太陽電池および集光型太陽光発電モジュールの基本的な構成は実施の形態1、実施の形態2の場合と同様であるので、適宜符号を援用し、主に異なる事項について説明する。
図4に基づいて、本実施の形態に係る太陽電池および集光型太陽光発電モジュールについて説明する。本実施の形態に係る太陽電池および集光型太陽光発電モジュールの基本的な構成は実施の形態1ないし実施の形態3の場合と同様であるので、適宜符号を援用し、主に異なる事項について説明する。
図5に基づいて、本実施の形態に係る集光型太陽光発電モジュールについて説明する。本実施の形態に係る集光型太陽光発電モジュールの基本的な構成は実施の形態1ないし実施の形態4の場合と同様であるので、適宜符号を援用し、主に異なる事項について説明する。
図6Aないし図6Eに基づいて、本実施の形態に係る太陽電池製造方法について説明する。本実施の形態に係る太陽電池の基本的な構成は実施の形態1ないし実施の形態5の場合と同様であるので、適宜符号を援用し、主に異なる事項について説明する。
図7ないし図9に基づいて、本実施の形態に係る太陽電池および集光型太陽光発電モジュールについて説明する。
図10Aないし図10Dに基づいて、本実施の形態に係る太陽電池製造方法について説明する。なお、本実施の形態に係る太陽電池製造方法で製造する太陽電池は実施の形態7に係る太陽電池310であるので、実施の形態7での符号をそのまま適用する。
図11に基づいて、本実施の形態に係る集光型太陽光発電ユニットについて説明する。なお、本実施の形態に係る集光型太陽光発電ユニットは実施の形態7で説明した太陽電池310を備える集光型太陽光発電モジュール340mを複数配置して構成してあるので、実施の形態7での符号をそのまま適用する。
Claims (19)
- 集光レンズにより集光された太陽光を光電変換する太陽電池素子と、該太陽電池素子が載置されたレシーバ基板と、集光された太陽光を入射させる入射面と前記太陽電池素子に対向して配置され前記太陽電池素子に太陽光を照射する照射面とを有する柱状光学部材と、前記レシーバ基板に立設され前記柱状光学部材を保持する保持部とを備える太陽電池であって、
前記保持部は、前記柱状光学部材の側面に当接され前記入射面から前記照射面の方向へ厚さを持たせた枠状の当接枠体と、前記柱状光学部材から離して配置され前記当接枠体を支持する支持体とを備え、
前記側面は、入射された太陽光を前記照射面の方向へ全反射するように傾斜させてあり、
前記入射面は、集光された太陽光によって形成される集光束領域が前記入射面に形成する入射面集光束領域を内側に位置させる大きさとしてあること
を特徴とする太陽電池。 - 請求項1に記載の太陽電池であって、
前記側面は、前記照射面の垂直方向に対して8度~20度の傾斜角を有していること
を特徴とする太陽電池。 - 請求項1または請求項2に記載の太陽電池であって、
前記照射面は、前記太陽電池素子の内側に位置する大きさとしてあること
を特徴とする太陽電池。 - 請求項1~請求項3のいずれか一つに記載の太陽電池であって、
前記当接枠体は、矩形状としてあり、前記支持体は、前記当接枠体の4隅に柱状に配置してあること
を特徴とする太陽電池。 - 太陽光を集光して太陽電池に入射させる集光レンズと、該集光レンズにより集光された太陽光を光電変換する太陽電池とを備える集光型太陽光発電モジュールであって、
前記太陽電池は、請求項1~請求項4のいずれか一つに記載の太陽電池であること
を特徴とする集光型太陽光発電モジュール。 - 請求項5に記載の集光型太陽光発電モジュールであって、
前記集光束領域が最小となる最小集光束領域は、前記柱状光学部材の内部に位置するように構成してあること
を特徴とする集光型太陽光発電モジュール。 - 請求項5または請求項6に記載の集光型太陽光発電モジュールであって、
前記当接枠体の厚さは、長波長側の太陽光が形成する長波長側集光束領域の外周側領域を遮光する厚さとしてあること
を特徴とする集光型太陽光発電モジュール。 - 請求項7に記載の集光型太陽光発電モジュールであって、
前記最小集光束領域は、前記当接枠体の底部と前記照射面との間に位置する構成としてあること
を特徴とする集光型太陽光発電モジュール。 - 請求項8に記載の集光型太陽光発電モジュールであって、
前記集光レンズの温度変化に伴って変位する前記集光レンズの焦点が構成する焦点群は、前記底部と前記照射面との間に位置する構成としてあること
を特徴とする集光型太陽光発電モジュール。 - 請求項5~請求項9のいずれか一つに記載の集光型太陽光発電モジュールであって、
前記太陽電池の位置を太陽軌道上の太陽の移動先へ規定時間毎に先行して移動させる間欠追尾制御態様としたとき、
前記入射面集光束領域は、前記入射面の内側に位置する構成としてあること
を特徴とする集光型太陽光発電モジュール。 - 集光レンズにより集光された太陽光を光電変換する太陽電池素子と、該太陽電池素子が載置されたレシーバ基板と、集光された太陽光を入射させる入射面と前記太陽電池素子に対向して配置され前記太陽電池素子に太陽光を照射する照射面とを有する柱状光学部材と、該柱状光学部材の側面に当接された枠状の当接枠体と前記柱状光学部材から離して配置され前記当接枠体を支持する支持体とを有して前記レシーバ基板に立設された保持部とを備える太陽電池を製造する太陽電池製造方法であって、
前記太陽電池素子を載置した前記レシーバ基板を準備する基板準備工程と、
前記レシーバ基板に接着性樹脂を塗布して、前記太陽電池素子を樹脂封止する透光性樹脂が注入される内側樹脂止め部および該内側樹脂止め部の外側で前記支持体が固定される外側樹脂止め部を形成する樹脂止め部形成工程と、
前記支持体を前記外側樹脂止め部に接着して前記接着性樹脂を硬化することで前記支持体を前記レシーバ基板に固定する支持体固定工程と、
前記内側樹脂止め部の内側に前記透光性樹脂を注入する透光性樹脂注入工程と、
前記柱状光学部材を前記当接枠体に当接させて前記照射面を前記透光性樹脂に載置する柱状光学部材載置工程と、
前記透光性樹脂を硬化して樹脂封止部を形成する樹脂封止部形成工程とを備えること
を特徴とする太陽電池製造方法。 - 集光レンズにより集光された太陽光を光電変換する太陽電池素子と、該太陽電池素子が載置されたレシーバ基板と、前記太陽電池素子を樹脂封止する樹脂封止部とを備える太陽電池であって、
集光された太陽光を前記太陽電池素子へ導光する導光路を構成する柱状光学部材と、
該柱状光学部材を保持する保持壁を有し前記樹脂封止部を覆って前記レシーバ基板に載置された光学保持部とを備えること
を特徴とする太陽電池。 - 請求項12に記載の太陽電池であって、
前記柱状光学部材は、太陽光を前記太陽電池素子に集光する光路傾斜面を有し、前記保持壁は、前記光路傾斜面に整合させた保持傾斜面としてあること
を特徴とする太陽電池。 - 請求項12または請求項13に記載の太陽電池であって、
前記光学保持部は、前記レシーバ基板が有する金属のベース基台に当接させてあること
を特徴とする太陽電池。 - 請求項12ないし請求項14のいずれか一つに記載の太陽電池であって、
前記光学保持部は、外周側面に櫛の歯状のフィンを備えること
を特徴とする太陽電池。 - 請求項12ないし請求項15のいずれか一つに記載の太陽電池であって、
前記柱状光学部材は、四角柱としてあり、前記光学保持部は、前記四角柱の軸方向角部を包囲する溝状の切り欠き部を備えること
を特徴とする太陽電池。 - 請求項12ないし請求項16のいずれか一つに記載の太陽電池であって、
前記樹脂封止部は、前記柱状光学部材と前記太陽電池素子との間で周囲領域より薄くしてあること
を特徴とする太陽電池。 - 太陽光を集光する集光レンズと、該集光レンズにより集光された太陽光を光電変換する太陽電池とを備える集光型太陽光発電モジュールであって、
前記太陽電池は、請求項12ないし請求項17のいずれか一つに記載の太陽電池であることを特徴とする集光型太陽光発電モジュール。 - 集光レンズにより集光された太陽光を光電変換する太陽電池素子と、該太陽電池素子が載置されたレシーバ基板と、前記太陽電池素子を樹脂封止する樹脂封止部と、集光された太陽光を前記太陽電池素子へ導光する導光路を構成する柱状光学部材と、該柱状光学部材を保持する保持壁を有し前記樹脂封止部を覆って前記レシーバ基板に載置された光学保持部とを備える太陽電池を製造する太陽電池製造方法であって、
金属を成形加工して前記光学保持部を準備する光学保持部準備工程と、
前記光学保持部を前記太陽電池素子の外周で前記レシーバ基板に当接させて配置する光学保持部配置工程と、
前記光学保持部および前記レシーバ基板が構成する空間に前記樹脂封止部を形成する封止樹脂を注入する樹脂注入工程と、
前記保持壁に前記柱状光学部材を載置する光学部材載置工程とを備えること
を特徴とする太陽電池製造方法。
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AU2009208410A1 (en) | 2009-08-06 |
EP2246900A1 (en) | 2010-11-03 |
US20100326494A1 (en) | 2010-12-30 |
CN101981707A (zh) | 2011-02-23 |
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