Stacked solar cell device

• US 20100018568A1
• Filed: 11/17/2006
• Published: 01/28/2010
• Est. Priority Date: 11/17/2006
• Status: Active Grant

• Current Assignee: Sphelar Power Corporation (Dexerials Corporation)
• Original Assignee: Kyosemi Corporation (Dexerials Corporation)
• Inventors: Nakata, Josuke
• Granted Patent: US 8,716,590 B2
• Time in Patent Office: Days
• US Class Current: 136/246
• CPC Class Codes: H01L 31/02008 for solar cells or solar cell modules
• CPC Class Codes: H01L 31/035281 Shape of the body
• CPC Class Codes: H01L 31/0504 specially adapted for series or parallel connection of solar cells in a module
• CPC Class Codes: H01L 31/0543 comprising light concentrating means of the refractive type, e.g. lenses
• CPC Class Codes: H02S 40/22 Light-reflecting or light-concentrating means directly associated with the PV cell or integrated with the PV cell H01L31/054
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

This stacked solar battery device includes a plurality of solar battery units 4, an enclosure case made of a metal plate to house these solar battery units 4 therein, a cover glass having a partial cylindrical lens formed. The plurality of solar battery units 4 are housed in a plurality of recesses of the enclosure case, and are sealed with a sealing material of synthetic resin. The solar battery unit 4 has a planar light receiving solar battery module 10, and rod light receiving solar battery modules 30 and 50 stacked so that the module having a shorter center wavelength of the sensitivity wavelength band is positioned closer to the incident side of the sunlight. The solar battery module 10 is configured so that five planar light receiving solar-battery cells 11 are connected in parallel with four connection rods 20a and 20b, and the sunlight modules 30 and 50 are configured so that five sub modules 31 and 51 are connected in parallel respectively with the connection rods 40a, 40b, 60a and 60b. The sub modules 31 and 51 are configured so that a plurality of rod-shaped solar battery cells 32 and 52 respectively are connected in series.

Claims

1. A stacked solar battery device comprising a plurality of solar battery modules stacked in plural layers:

at least one of the solar battery modules comprises a plurality of rod light receiving solar battery sub modules each of which is provided with a plurality of rod-shaped solar battery cells and each of which comprises;

a substrate made of a rod-shaped semiconductor crystal of a p-type or n-type semiconductor having a circular or partial circular cross-section;

an another conductive layer formed at a portion of a surface layer of said substrate except for a strap-shaped portion parallel to an axial center of said substrate, and having a conductivity type different from said substrate;

a pn junction formed with said substrate and the another conductive layer and having a partial cylindrical shape;

a first strap-shaped electrode ohmic-connected to a surface of the strap-shaped portion of said substrate; and

a second strap-shaped electrode ohmic-connected to a surface of said another conductive layer on an opposite side from the first electrode with respect to the axial center of said substrate;

the plurality of rod-shaped solar battery cells in the rod light receiving solar battery sub module are arranged on a plane in parallel so that a conductive direction defined by the first and second electrodes is aligned in a horizontal direction and are electrically connected in series by connecting electrically the first and second electrodes in each pair of adjacent rod-shaped solar battery cells.

2. The stacked solar battery device according to claim 1, wherein the plural kinds of solar battery modules have different sensitivity wavelength bands said plural kinds of solar battery modules being stacked so that the solar battery module having a shorter center wavelength of the sensitivity wavelength band is positioned closer to an incident side of sunlight, at least one kind of the solar battery module being comprised by a plurality of planar light receiving sub modules, each of which comprises a planar light receiving solar battery cell having a planar pn junction.

3. The stacked solar battery device according to claim 2, wherein the stacked solar battery device comprises three kinds of solar battery modules;

two kinds of the solar battery modules each comprises a plurality of said rod light receiving solar battery sub modules, and one kind of the solar battery modules comprises a plurality of planar light receiving sub modules; and

the solar battery module constituted by the plurality of planar light receiving sub modules is arranged on an uppermost position.

4. The stacked solar battery device according to claim 2 or 3, wherein each of the rod light receiving solar battery sub modules and each of the planar light receiving sub modules are configured so that light receiving areas thereof are equal to each other.

6. The stacked solar battery device according to claim 4, wherein a pair of first connection rods is provided which connects in parallel and couples integrally the plurality of rod light receiving solar battery sub modules comprising the solar battery module;

and two pairs of second connection rods are provided which connect in parallel and couple integrally the plurality of planar light receiving sub modules comprising the solar battery module.

7. The stacked solar battery device according to claim 6, wherein an enclosure case made of a metal plate and having one or more recesses protruding downward is provided ;

and

the one or more recess of the enclosure case houses the plural kinds of solar battery modules in a stacked state.

8. The stacked solar battery device according to claim 7, wherein said enclosure case has a plurality of said recesses arranged in parallel and horizontally in a width direction of said recess;

and

the plural kinds of solar battery modules are housed in each of the plurality of recesses in a stacked state.

9. The stacked solar battery device according to claim 8, wherein at least one of the recesses of said enclosure case has substantially an inverted trapezoid cross-section of which the width gradually increases upward, and a pair of side walls and a bottom wall of the recess have inner surfaces made to be light reflecting surfaces.

10. The stacked solar battery device according to claim 9, wherein a lens member having a lens portion having a light collecting function to collect the sunlight toward the plurality of solar battery modules is provided closer to the incident side of sunlight than the plurality of solar battery modules.

11. The stacked solar battery device according to claim 10, wherein spaces in the plurality of recesses of said enclosure case are filled with transparent synthetic resin sealing materials, and they are packaged by said enclosure case and the lens member.

12. The stacked solar battery device according to claim 9, wherein a trapezoidal protruding pedestal protruding upward by a slight predetermined height is formed at the bottom wall of said enclosure case.

13. The stacked solar battery device according to claim 8, wherein a plurality of end stopping blocks are provided each of which closes an end of the recess of said enclosure case;

the end stopping block is provided with a plurality of connection pipes made of metal for inserting ends of said first and second connection rods so as to be electrically connected; and

the connection pipes are projected to an outside of the end stopping block as external terminals.

5. (canceled)