Systems methods and apparatuses for magnetic processing of solar modules
View Patent ↗Provided herein are methods, apparatuses and systems for fabricating photovoltaic cells and modules. In certain embodiments, the methods, apparatuses and systems involve coating ferromagnetic substrates with thin film solar cell materials and using magnetic force to constrain, move or otherwise manipulate partially fabricated cells or modules. According to various embodiments, the methods, apparatuses and systems provide magnetically actuated handling throughout a photovoltaic cell or module fabrication process, from forming photovoltaic cell layers on a substrate to packaging the module for transport and installation. The magnetically manipulated processing provides advantages over conventional photovoltaic module processing operations, including fewer mechanical components, greater control over placement and tolerances, and ease of handling. As a result, the methods, apparatuses and systems provide highly efficient, low maintenance photovoltaic module fabrication processes.
1. A thin film photovoltaic cell pallet to support a partially fabricated thin film photovoltaic cell module, said pallet comprising a planar pallet body; a magnetic sheet disposed on said planar pallet body; and a plurality of spaced-apart substantially parallel magnetic elements disposed on said magnetic sheet.
2. The thin film photovoltaic cell pallet of claim 1 wherein the magnetic elements are magnetic strips.
3. The thin film photovoltaic cell pallet of claim 1 wherein the magnetic elements are rectangular in top profile and have a constant polarity along their lengths.
4. The thin film photovoltaic cell pallet of claim 1 wherein the each of the plurality of spaced-apart substantially parallel magnetic elements has a bottom surface facing said magnetic sheet and a top surface opposite said bottom surface.
5. The thin film photovoltaic cell pallet of claim 4 wherein the plurality of spaced-apart substantially parallel magnetic elements are arranged such that the top surfaces of adjacent magnetic elements are of opposite polarities.
6. The thin film photovoltaic cell pallet of claim 1 wherein the magnetic sheet is a ferromagnetic sheet.
7. The thin film photovoltaic pallet of claim 1 wherein the magnetic sheet has a thickness between 2 mils and 50 mils.
8. The thin film photovoltaic cell pallet of claim 1 wherein the planar pallet body comprises raised fixtures configured to hold a non-magnetic substrate in place.
9. The thin film photovoltaic cell pallet of claim 1 further comprising a non-magnetic layer having a first surface to support a non-magnetic substrate.
10. The thin film photovoltaic cell pallet of claim 9 wherein the non-magnetic layer further comprises raised features on a surface opposite the first surface, wherein said raised features interlock with the plurality of spaced-apart substantially parallel magnetic elements.
11. The thin film photovoltaic cell pallet of claim 9 wherein the non-magnetic layer comprises a high friction polymeric material.
12. The thin film photovoltaic cell pallet of claim 9 wherein the non-magnetic layer comprises silicone or polyurethane.
13. The thin film photovoltaic cell pallet of claim 1 further comprising a magnetic field exerting a force of at least 0.5 N.
14. The thin film photovoltaic cell pallet of claim 1 wherein the planar pallet body comprises an underside having recesses configured to position the pallet on a conveyor assembly.
15. The thin film photovoltaic cell pallet of claim 1 wherein said planar pallet body is rectangular, having a major dimension and a minor dimension.
16. The thin film photovoltaic cell pallet of claim 15 wherein said spaced-apart substantially parallel magnetic elements are magnetic strips aligned with said major dimension of the planar pallet body.
17. The thin film photovoltaic cell pallet of claim 1 wherein said spaced-apart substantially parallel magnetic elements are magnetic strips having a width of about 0.5 inches and a height of about 0.3 inches.
18. The thin film photovoltaic cell pallet of claim 1 wherein said substantially parallel magnetic elements are secured to the magnetic sheet only by magnetic force.
19. A thin film photovoltaic cell pallet to support a partially fabricated thin film photovoltaic cell module, said pallet comprising: a platform, a first magnetic layer disposed on said platform and a second magnetic layer disposed on said first layer.
20. The thin film photovoltaic cell pallet of claim 19 wherein the first magnetic layer is a ferromagnetic layer.
21. The thin film photovoltaic cell pallet of claim 19 wherein the second magnetic layer comprises spaced-apart substantially parallel permanent magnets.
22. A magnetically-actuated assembly line for thin film photovoltaic cell modules, comprising: a magnetic pallet for securing thin film photovoltaic cells on a module substrate, the magnetic pallet comprising a planar pallet body, a magnetic sheet disposed on said planar pallet body, and a plurality of spaced-apart substantially parallel magnetic elements disposed on said magnetic sheet; a conveyor fitted to convey the pallet; and assembly stations disposed along the conveyor.