Systems and methods for recycling fuel cell stack components

Patent metadata

Field	Value
Publication number	US-10756355-B2
Application number	US-201715437799-A
Country	US
Kind code	B2
Filing date	Feb 21, 2017
Priority date	Feb 23, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

System and methods for refurbishing fuel cell stack components, the methods including singulating the stack using a splitting apparatus or a liquid nitrogen bath. Fuel cell debris may be removed from interconnects of the fuel cell stack using laser heating, flame heating, a die, sonication, a nubbed roller, grit blasting, and/or a high pressure fluid.

First claim

What is claimed is:

1. A method of using a splitting apparatus comprising:
a main body;
an alignment plate disposed on the main body and configured to receive a fuel cell stack;
a first arm connected to the main body and configured to move with respect to the main body; and
first wedges attached to the first arm and configured to be inserted into the stack and separate components of the stack, the method comprising:
aligning the first wedges with openings in the stack;
inserting the first wedges into the openings in the stack to mechanically separate components of the stack; and
removing the separated components.

2. The method of claim 1 , wherein the inserting of the first wedges comprises changing a pressure applied to a fluid disposed in the main body, such that the first arm moves toward the stack.

3. The method of claim 1 , wherein the inserting of the first wedges comprises inserting multiple pairs of the first wedges into openings in at least one side of the stack along a stack stacking direction, such that multiple components of the stack are separated substantially simultaneously.

4. The method of claim 1 , wherein the stack is positioned horizontally and the first wedges are inserted into air inlet openings disposed on one side of the stack.

5. The method of claim 1 , wherein:
the separated components comprise interconnects; and
the method further comprises irradiating the interconnects with a laser to remove fuel cell debris from interconnects.

6. The method of claim 5 , wherein the fuel cell debris comprises at least one of a ceramic electrolyte or a seal material.

7. The method of claim 5 , wherein scanning the laser comprises irradiating opposing sides of the interconnect with one or more laser beams.

8. The method of claim 7 , wherein the opposing sides of the interconnect are irradiated simultaneously.

9. The method of claim 6 , wherein scanning the laser beam comprises scanning the laser beam while the interconnect is disposed in a vertical position.

10. A method of recycling fuel cell stack components, comprising:
singulating the stack into separate interconnects by inserting first wedges into air channel openings exposed on a first side of the stack, using a hydraulically or pneumatically driven first arm attached to the first wedges;
removing fuel cell electrolyte from the interconnects;
removing metal contacts from the interconnects;
removing seal material from the interconnects; and
removing a coating from the interconnects.

11. The method of claim 10 , wherein the singulating further comprises separating the interconnects by inserting second wedges into air channel openings exposed on an opposing second side of the stack, using a hydraulically or pneumatically driven second arm attached to the second wedges.

12. The method of claim 10 , wherein the removing the metal contacts comprises using a pin array, ultrasonic waves, or grit blasting to remove the metal contacts.

13. The method of claim 10 , wherein the removing of the seal material comprises using laser radiation to remove the seal material.

14. The method of claim 10 , wherein the removing the coating comprises using grit blasting to remove the coating.

15. The method of claim 1 , wherein the splitting apparatus further comprises:
a second arm connected to the main body and configured to move with respect to the main body; and
second wedges attached to the second arm and configured to be inserted into the stack and separate components of the stack,
wherein the first and second arms are disposed on opposing sides of the stack, and
wherein the method further comprises simultaneously inserting the first and second wedges into the opposing sides of the stack, to singulate the stack.

16. The method of claim 15 , wherein the first and second arms are hydraulically or pneumatically driven.

17. The method of claim 1 , wherein the openings are openings of air channels of interconnects of the stack.

18. The method of claim 1 , wherein the aligning comprises moving the alignment plate relative to the main body.

19. The method of claim 1 , wherein the splitting apparatus further comprises a gripper to attach to the first wedges to the first arm.

Assignees

• Bloom Energy Corp

Inventors

• Seiki Elson
• Lin Cheng-Yu
• Moslehi Bijan
• Hilton Jakob
• Paran Drew
• Delkaninia Ali
• Bui Young

Classifications

• Y02E60/50

  Fuel cells · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• H01M8/008 Primary

  Disposal or recycling of fuel cells · CPC title

• Y02W30/86

  Cross-Sectional Technologies · mapped topic