Spiral wrapped cylindrical proton exchange membrane fuel cells and methods of making same

• US 6,063,517 A
• Filed: 10/16/1997
• Issued: 05/16/2000
• Est. Priority Date: 10/16/1997
• Status: Expired due to Term

• Current Assignee: Southwest Research Institute
• Original Assignee: Southwest Research Institute
• Inventors: Stewart, Michael, Bass, Edward Albert, Montemayor, Alan, Sridhar, Narasi
• Primary Examiner(s): Nuzzolillo, Maria
• Assistant Examiner(s): Martin, Angela J.
• Application Number:
  US08/951,400
• Time in Patent Office: 943 Days
• Field of Search: 429/31, 429/35, 429/39, 429/40, 429/41
• US Class Current: 429/492
• CPC Class Codes: H01M 8/1007 with both reactants being gaseous or vaporised H01M8/12 takes precedence
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A pre-spiral bundle for making a spiral wrapped cylindrical fuel cell and cylindrical fuel cells made using the pre-spiral bundle. The pre-spiral bundle comprises a sleeve defining a hydrogen flowpath. The sleeve comprises a proton exchange membrane encapsulating a substantially planar anode in ionic communication with a catalytically effective amount of a noble metal catalyst. A first hydrogen inlet comprises a first edge of the sleeve and a second hydrogen inlet comprises an opposed, substantially parallel edge of the sleeve. The hydrogen flowpath is defined by the anode. A cylindrical fuel cell is made by abutting a flexible, porous cathode to the sleeve in ionic communication with a noble metal catalyst and wrapping the sleeve and the cathode around one of the hydrogen inlets.

Claims

1. A pre-spiral bundle for a cylindrical fuel cell comprising:

an anode having first and second opposed edges and at least one surface in ionic communication with a noble metal catalyst;

a first hydrogen inlet disposed along said first edge of said anode;

a second hydrogen inlet disposed along said second edge of said anode; and

a sleeve comprising a proton exchange membrane having upper and lower substantially planar surfaces abutting and encapsulating said anode, said first hydrogen inlet, said second hydrogen inlet, and defining a hydrogen flow path along said anode and between the upper and lower surfaces of said sleeve.

2. The pre-spiral bundle of claim 1 wherein

said hydrogen flowpath extends from said first hydrogen inlet toward said second hydrogen inlet and from said second hydrogen inlet toward said first hydrogen inlet.

5. The pre-spiral bundle of claim 1 wherein at least one of said first and second hydrogen inlets comprises a hydrogen injection tube comprising sufficient rigidity to support said pre-spiral bundle wrapped spirally around said hydrogen injection tube.

6. The pre-spiral bundle of claim 2 wherein at least one of said first and second hydrogen inlets comprises a hydrogen injection tube comprising sufficient rigidity to support said pre-spiral bundle wrapped spirally around said hydrogen injection tube.

9. The pre-spiral bundle of claim 1 wherein said anode is sandwiched between first and second layers comprising a catalytically effective amount of said noble metal catalyst.

10. The pre-spiral bundle of claim 2 wherein said anode is sandwiched between first and second layers comprising said a catalytically effective amount of said noble metal catalyst.

13. The pre-spiral bundle of claim 5 wherein said anode is sandwiched between first and second layers comprising a catalytically effective amount of said noble metal catalyst.

14. The pre-spiral bundle of claim 6 wherein said anode is sandwiched between first and second layers comprising a catalytically effective amount of said noble metal catalyst.

22. The pre-spiral bundle of claim 1 wherein said sleeve further comprises third and fourth edges, wherein at least one of said first, second, third and fourth edges is heat sealed.

23. The fuel cell of claim 2 wherein said sleeve further comprises third and fourth edges, wherein at least one of said first, second, third and fourth edges is heat sealed.

24. The pre-spiral bundle of claim 5 wherein said sleeve further comprises third and fourth edges, wherein at least one of said first, second, third and fourth edges is heat sealed.

3. A spirally wrapped cylindrical fuel cell comprising:

a substantially planar anode having first and second opposed edges and at least one surface in ionic communication with a first noble metal catalyst;

a first hydrogen inlet disposed along said first edge of said anode;

a second hydrogen inlet disposed along said second edge of said anode;

a sleeve comprising a proton exchange membrane having upper and lower substantially planar surfaces abutting and encapsulating said anode, said first hydrogen inlet, said second hydrogen inlet, and defining a hydrogen flow path along said anode and between the upper and lower surfaces of said sleeve; and

a cathode in fluid communication with a flowpath for a gas comprising oxygen and in ionic communication with said anode and a second noble metal catalyst;

wherein said sleeve and said cathode are spirally wrapped around a mandrel comprising one of said first and second hydrogen inlets.

4. The fuel cell of claim 3 wherein

said hydrogen flows from said first hydrogen inlet toward said second hydrogen inlet and from said second hydrogen inlet toward said first hydrogen inlet.

7. The fuel cell of claim 3 wherein said at least one of said first and second hydrogen inlets comprises a hydrogen injection tube comprising sufficient rigidity to support said spirally wrapped cylindrical fuel cell.

8. The fuel cell of claim 4 wherein at least one of said first and second hydrogen inlets comprises a hydrogen injection tube comprising sufficient rigidity to support said spirally wrapped cylindrical fuel cell.

11. The fuel cell of claim 3 wherein said anode is sandwiched between first and second layers comprising said a catalytically effective amount of said noble metal catalyst.

12. The fuel cell of claim 4 wherein said anode is sandwiched between first and second layers comprising said a catalytically effective amount of said noble metal catalyst.

15. The fuel cell of claim 7 wherein said anode is sandwiched between first and second layers comprising a catalytically effective amount of said noble metal catalyst.

16. The fuel cell of claim 8 wherein said anode is sandwiched between first and second layers comprising a catalytically effective amount of said noble metal catalyst.

17. A cylindrical fuel cell comprising:

a pre-spiral bundle in ionic communication with a cathode, said pre-spiral bundle and said cathode being spirally wrapped around an axis to form a cylinder comprising a top and a bottom and retained by an electrically conductive casing;

an anode having first and second opposed edges and at least one surface in ionic communication with a first noble metal catalyst effective to produce an open circuit voltage of at least about 0.5 volts;

a first hydrogen inlet disposed along said first edge of said anode;

a second hydrogen inlet disposed along said second edge of said anode;

a sleeve comprising a proton exchange membrane having upper and lower substantially planar surfaces abutting and encapsulating said anode, said first hydrogen inlet, said second hydrogen inlet, and defining a hydrogen flow path along said anode and between the upper and lower surfaces of said sleeve; and

a cathode in fluid communication with a flowpath for a gas comprising oxygen and in ionic communication with said anode and a second noble metal catalyst;

wherein said sleeve and said cathode are spirally wrapped around a mandrel comprising one of said first and second hydrogen inlets.

18. The cylindrical fuel cell of claim 17 wherein said axis is selected from the group consisting of said first and second hydrogen inlets.

19. The cylindrical fuel cell of claim 18 wherein said axis comprises a hydrogen injection tube comprising sufficient rigidity to support said cylindrical fuel cell.

20. The fuel cell of claim 17 wherein said anode is sandwiched between first and second layers comprising said catalytically effective amount of said first noble metal catalyst.

21. The fuel cell of claim 19 wherein said anode is sandwiched between first and second layers comprising said catalytically effective amount of said first noble metal catalyst.

25. The fuel cell of claim 17 wherein said sleeve further comprises third and fourth edges, wherein at least one of said first, second, third and fourth edges is heat sealed.