METHOD AND APPARATUS FOR MANUFACTURING SOLAR CONCENTRATORS USING GLASS PROCESS

• US 20090038343A1
• Filed: 07/23/2008
• Published: 02/12/2009
• Est. Priority Date: 08/06/2007
• Status: Active Grant

• Current Assignee: Maxeon Solar Pte Limited
• Original Assignee: Solaria Corporation (Complete Solaria, Inc. (United States))
• Inventors: GIBSON, KEVIN R.
• Granted Patent: US 8,707,736 B2
• Time in Patent Office: Days
• US Class Current: 65/60.100
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: C03B 13/08 Rolling patterned sheets , e.g. sheets having a surface pattern
• CPC Class Codes: C03B 18/02 Forming sheets
• CPC Class Codes: C03B 18/14 Changing the surface of the glass ribbon, e.g. roughening by chemical methods C03C
• CPC Class Codes: C03C 17/00 Surface treatment of glass, not in the form of fibres or filaments, by coating optical coatings of optical elements G02B1/10
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: H01L 31/18 Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

A method for manufacturing a glass concentrator for a solar module. The method includes providing a glass material in a molten state and processing the glass material in the molten state to form a ribbon glass including a first surface and a second surface. Additionally, the method includes subjecting the first surface to one or more drum members to form a plurality of concentrating structures while continuously passing the ribbon glass via the second surface over a plurality of rollers. Each of the concentrating structures includes an aperture region, an exit region, and one or more reflection regions. The aperture region is configured to receive incoming light and the one or more reflection regions are configured to concentrate the received incoming light to the exit region. The method further includes cutting the ribbon glass into one or more sheets of glasses including a predetermined number of the plurality of concentrating structures.

Claims

1. A method for manufacturing a glass concentrator for a solar module, the method comprising:

providing a glass material in a molten state;

processing the glass material in the molten state to form a ribbon glass including a first surface and a second surface;

subjecting the first surface to one or more drum members to form a plurality of concentrating structures while continuously passing the ribbon glass via the second surface over a plurality of rollers, each of the concentrating structures including an aperture region, an exit region, and one or more reflection regions, the aperture region configured to receive incoming light and the one or more reflection regions configured to concentrate the received incoming light to the exit region, the exit region being smaller in area than the aperture region; and

cutting the ribbon glass into one or more sheets of glasses, each sheet of glass including a predetermined number of the plurality of concentrating structures.

2. The method of claim 1 wherein the processing the glass material in the molten state to form a ribbon glass comprises a float glass process, wherein the ribbon glass is a thickness of strip material floating on a bath of molten tin, the thickness is measured between the first surface and the second surface.

3. The method of claim 2 wherein the ribbon glass can be cooled sufficiently to a first temperature so that the ribbon glass becomes hard enough to be passed over the plurality of rollers from the bath of molten tin.

4. The method of claim 3 wherein the ribbon glass at the first temperature comprises an elastically deformable surface characteristic at least down to a depth, the depth being less than or equal to the thickness of the ribbon glass.

5. The method of claim 3 wherein the first temperature is about 600 °

C.

6. The method of claim 1 wherein the subjecting the first surface to one or more drum members to form a plurality of concentrating structures comprises a rolling process, wherein the ribbon glass is passed through a gap between the one or more drum members and one or more rollers, the one or more drum members include predetermined moldings to form a plurality of concentrating structures into the first surface, the one or more rollers belong to a plurality of rollers supporting the second surface.

7. The method of claim 1 wherein each concentrating structure can be disposed physically one-next-to-another on the first surface in a first direction, the first direction being parallel to passing direction of the ribbon glass.

8. The method of claim 7 wherein each of the concentrating structure can be elongated along a second direction, the second direction being substantially perpendicular to the first direction.

9. The method of claim 8 wherein the concentrating structure can be an elongated truncated pyramid structure,

wherein:

a bottom base with a first area is the aperture region;

a top base with a second area is the exit region, the second area being one half or smaller than the first area;

two side regions are the reflection regions, the two side regions respectively connecting one side of the exit region with one side of the aperture region and another side of the exit region with another side of the aperture region.

10. The method of claim 5 further comprising:

cooling the ribbon glass after passing the gap to maintain the formed plurality of concentrating structures on the first surface.

11. The method of claim 1 wherein the cutting the ribbon glass comprises:

scribing the ribbon glass at predetermined positions;

cutting the ribbon glass along the scribed lines to form one or more sheets of glasses; and

trimming edges of each sheet of glass.

12. The method of claim 1, and further comprising:

processing the one or more sheets of glasses; and

forming a glass concentrator for a solar module from each of the one or more sheets of glasses.

13. The method of claim 12 wherein the processing the one or more sheets of glasses comprises at least partially flame polishing the one or more reflection regions of each concentrating structures on the first surface.

14. The method of claim 12 wherein the processing the one or more sheets of glasses further comprises performing reflection enhancement coating on the one or more reflection regions of each concentrating structures on the first surface.

15. The method of claim 12 wherein the processing the one or more sheets of glasses further comprises performing a tempering process.

16. The method of claim 12 wherein the processing the one or more sheets of glasses further comprises performing a lamination process to bond the second surface with a sheet of flat glass without concentrating structures using a sheet of plastic.

17. The method of claim 12 wherein the processing the one or more sheets of glasses further comprises performing one or more anti-reflection and/or anti-infrared coatings overlying the second surface.

18. The method of claim 12 wherein the glass concentrator formed for solar module comprises a load sustenance characteristic from the thickness, the load being at least of 2400 Pa uniformly applied on the second surface for 1 hour in two cycles.

19. The method of claim 18 wherein the glass concentrator formed for solar module further comprises a hail impact resistance characteristic of the sheet of glass, the impact hail being an ice ball with at least of 25 mm diameter directed at a speed of at least 23 meter per second to at least eleven locations on the second surface.

20. The method of claim 19 wherein the glass concentrator formed for solar module further comprises a geometric concentration characteristic provided by a ratio of the aperture region to the exit region for each concentrating structure, the ratio being characterized by a range from about 1.8 to about 4.5.