Flexible high-voltage adaptable current photovoltaic modules and associated methods
View Patent ↗A flexible photovoltaic module for converting light into an electric current includes a plurality of electrically interconnected flexible photovoltaic submodules monolithically integrated onto a common flexible substrate. Each photovoltaic submodule includes a plurality of electrically interconnected flexible thin-film photovoltaic cells monolithically integrated onto the flexible substrate. A flexible photovoltaic module for converting light into an electric current includes a backplane layer for supporting the photovoltaic module. A first pottant layer is disposed on the backplane layer, and a photovoltaic submodule assembly is disposed on the first pottant layer. The photovoltaic submodule assembly has at least one photovoltaic submodule, where each photovoltaic submodule includes a plurality of thin-film photovoltaic cells. A second pottant layer is disposed on the photovoltaic submodule assembly, and a upper laminate layer disposed on the second pottant layer.
1. A method for forming a photovoltaic module, comprising:
disposing a stack of thin-film layers on a flexible substrate;
creating a plurality of scribes and electrical connections in the stack of thin-film layers to form a plurality of photovoltaic submodules on the flexible substrate, each of the plurality of photovoltaic submodules including a plurality of electrically-connected photovoltaic cells; and
electrically connecting the plurality of photovoltaic submodules to form a photovoltaic submodule assembly;
wherein each of the plurality of photovoltaic submodules is electrically independent and electrically isolated from each other before the step of electrically connecting the plurality of photovoltaic submodules.
2. The method of claim 1 , the step of disposing the stack of thin-film layers comprising:
disposing a back contact layer on the flexible substrate;
disposing a solar absorber layer on the back contact layer;
disposing a window layer on the solar absorber layer; and
disposing a top contact layer on the window layer.
3. The method of claim 2 , further comprising:
electrically coupling leads to the photovoltaic submodule assembly; and
laminating the photovoltaic submodule assembly.
4. The method of claim 3 , the step of laminating comprising disposing the photovoltaic submodule assembly between a backplane layer and an upper laminate.
5. The method of claim 4 , the step of laminating further comprising:
disposing a first pottant layer between the backplane layer and the photovoltaic submodule assembly; and
disposing a second pottant layer between the photovoltaic submodule assembly and the upper laminate.
6. The method of claim 2 , the flexible substrate comprising a flexible web substrate, and the step of creating the plurality of scribes and electrical connections in the stack of thin-film layers comprising using a continuous web, roll-to-roll, processing system to create the plurality of scribes and electrical connections.
7. The method of claim 6 , the step of creating the plurality of scribes and electrical connection in the stack of thin-film layers comprising creating scribes parallel to a direction of transport of the flexible web substrate in the continuous web, roll-to-roll, processing system.
8. The method of claim 6 , the step of creating the plurality of scribes and electrical connection in the stack of thin-film layers comprising creating scribes perpendicular to a direction of transport of the flexible web substrate in the continuous web, roll-to-roll, processing system.
9. The method of claim 6 , further comprising inputting specifications into a computer controlling the continuous web, roll-to-roll, processing system to determine a number of photovoltaic cells electrically coupled in series in each of the plurality of photovoltaic modules.
10. The method of claim 2 , the step of electrically connecting the plurality of photovoltaic submodules comprising electrically connecting the plurality of photovoltaic submodules using electrically conductive flexible bus bars.
11. The method of claim 2 , the step of electrically connecting the plurality of photovoltaic submodules comprising electrically connecting the plurality of photovoltaic submodules using electrically conductive ink.
12. The method of claim 2 , the step of electrically connecting the plurality of photovoltaic submodules comprising:
determining an electrical topology of the photovoltaic submodule assembly which achieves a predetermined electrical characteristic of the photovoltaic submodule assembly; and
electrically connecting the plurality of photovoltaic submodules to realize the electrical topology.
13. The method of claim 12 , the predetermined electrical characteristic of the photovoltaic submodule assembly comprising a predetermined open circuit voltage of the photovoltaic submodule assembly.
14. The method of claim 13 , the predetermined electrical characteristic of the photovoltaic submodule assembly comprising a predetermined maximum current capability of the photovoltaic submodule assembly.