Liquid-gas separator for direct liquid feed fuel cell

• US 20070180992A1
• Filed: 06/02/2006
• Published: 08/09/2007
• Est. Priority Date: 02/07/2006
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kang, Sang-kyun, Cho, Woong-ho, Choi, Sang-hyeon, Sohn, Dong-kee
• Granted Patent: US 7,611,568 B2
• Time in Patent Office: Days
• US Class Current: 96/4
• CPC Class Codes: H01M 8/04164 by condensers, gas-liquid separators or filters
• CPC Class Codes: H01M 8/1009 with one of the reactants being liquid, solid or liquid-charged H01M8/12 takes precedence
• CPC Class Codes: H01M 8/1011 Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A liquid-gas separator for a direct liquid feed fuel cell includes: a housing having an open hole; a gas extracting membrane that covers the open hole and transmits only the gas; a liquid extracting member that defines a first chamber that contacts the gas extracting membrane and a second chamber that does not contact the gas extracting membrane, and selectively transmits the liquid in the first chamber to the second chamber; an inlet that guides the liquid and the gas into the housing; and an outlet that is connected to the second chamber and guides the liquid in the second chamber to the outside.

Claims

1. A liquid-gas separator of a direct liquid feed fuel cell which receives liquid and gas from the direct liquid feed fuel cell and separates the liquid and gas, the liquid-gas separator comprising:

a housing having an open hole;

a gas extracting membrane that covers the open hole and transmits only the gas;

a liquid extracting member that divides an interior of the housing into a first chamber that contacts the gas extracting membrane and a second chamber that does not contact the gas extracting membrane, and selectively transmits the liquid in the first chamber to the second chamber;

an inlet that guides the liquid and the gas into the first chamber; and

an outlet that is connected to the second chamber and guides the liquid in the second chamber to the outside.

2. The liquid-gas separator of claim 1, further comprising a removable cartridge that comprises:

the liquid extracting membrane; and

the second chamber;

wherein the housing comprises an entrance into which the removable cartridge is inserted and therein the second chamber includes a chamber hole through which the second chamber is connected to the outlet.

3. The liquid-gas separator of claim 1, wherein the liquid extracting membrane has pores with diameters of 50 μ

m or less.

4. The liquid-gas separator of claim 1, wherein the liquid extracting membrane comprises a hydrophilic foam.

5. The liquid-gas separator of claim 3, further comprising, in the second chamber, a hydrophilic member having larger pores than the pores of the liquid extracting membrane.

6. The liquid-gas separator of claim 5, wherein the hydrophilic member comprises hydrophilic foam having pores with diameters from 100 μ

m to 1 mm.

7. The liquid-gas separator of claim 3, wherein the second chamber is filled with ion exchange beads having diameters of 0.1 to 1 mm.

8. The liquid-gas separator of claim 1, wherein the gas extracting membrane comprises polytetrafluoro ethylene (PTFE).

9. The liquid-gas separator of claim 6, wherein the gas extracting membrane is formed by pressing the PTFE with a porous reinforcing member.

10. The liquid-gas separator of claim 1, wherein the liquid extracting membrane is installed substantially parallel to the gas extracting membrane.

11. A liquid-gas separator of a direct liquid feed fuel cell which receives liquid and gas from the direct liquid feed fuel cell and separates the liquid and gas, the liquid-gas separator comprising:

a housing having open portion on the outer circumference thereof;

a gas extracting membrane that covers the open portion and transmits only the gas;

a liquid extracting member that defines a first chamber that is connected to the gas extracting membrane and a second chamber that is not connected to the gas extracting membrane, and selectively transmits the liquid in the first chamber to the second chamber, wherein the second chamber is formed inside the first chamber;

an inlet that guides the liquid and the gas into the first chamber; and

an outlet that is connected to the second chamber and guides the liquid in the second chamber to the outside.

12. The liquid-gas separator of claim 11, further comprising a removable cartridge that comprises:

the liquid extracting membrane; and

the second chamber;

wherein the housing comprises an entrance into which the cartridge is inserted.

13. The liquid-gas separator of claim 11, wherein the liquid extracting membrane has pores with diameters of 50 μ

m or less.

14. The liquid-gas separator of claim 11, further comprising, in the second chamber, a first member having larger pores than the pores of the liquid extracting membrane.

15. The liquid-gas separator of claim 11, wherein the second chamber is filled with ion exchange beads having diameters of 0.1 to 1 mm.

16. The liquid-gas separator of claim 11, wherein the gas extracting membrane comprises polytetrafluoro ethylene (PTFE).

17. The liquid-gas separator of claim 16, wherein the gas extracting membrane is formed by pressing the PTFE with a porous reinforcing member.

18. A liquid-gas separator of a direct liquid feed fuel cell which receives liquid and gas from the direct liquid feed fuel cell and separates the liquid and gas, the liquid-gas separator comprising:

a housing having one or more open portions on an outer boundary thereof,

one or more gas extracting membranes, wherein each of the one or more open portions is covered by one of the one or more gas extracting membranes and wherein the one or more gas extracting membranes allow only gas to pass through from an interior of the housing to an exterior of the housing;

a liquid extracting member that divides the interior of the housing into a first chamber that has a least one boundary that includes at least one of the one or more open portions covered by one of the one or more gas extracting membranes and a second chamber that does not have at least one boundary containing at least one of the one or more open portions covered by one of the one or more gas extracting membranes, and wherein the liquid extracting member selectively transmits the liquid in the first chamber to the second chamber;

an inlet that guides the liquid and the gas into the first chamber; and

an outlet that is connected to the second chamber and guides the liquid in the second chamber to the outside.

19. The liquid-gas separator of claim 18, wherein the open portions on the outer boundary of the housing are positioned such that the liquid-gas separator performs liquid-gas separation regardless of the orientation of the liquid-gas separator.