Planar multi-junction electrochemical cell

• US 4,648,955 A
• Filed: 04/19/1985
• Issued: 03/10/1987
• Est. Priority Date: 04/19/1985
• Status: Expired due to Term

• Current Assignee: ALARIS Medical Systems, Inc. (Becton, Dickinson & Co)
• Original Assignee: Ivax Corporation (Teva Pharmaceutical Industries, Ltd.)
• Inventors: Maget, Henri J. R.
• Primary Examiner(s): Valentine, Donald R.
• Application Number:
  US06/724,912
• Time in Patent Office: 690 Days
• Field of Search: 204/263-266, 204/282-283, 204/252, 204/295, 204/258, 204/301, 429/30
• US Class Current: 204/258
• CPC Class Codes: F04B 17/00 Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• CPC Class Codes: H01M 8/00 Fuel cells; Manufacture thereof
• CPC Class Codes: H01M 8/2418 Grouping by arranging unit cells in a plane H01M8/2425, H01M8/244 take precedence
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

An improved arrangement of electrochemical cells wherein the individual cells are arranged on a single electrolytic membrane. The arrangement provides for the placement of many individual cells in one chamber, thereby eliminating the many chamber walls and inlet and outlet lines associated with the standard structure. An electrochemical device can thus be constructed very simply and, when the cells are electrically connected in series, will operate at voltages compatible with standard battery voltages or generate power at any desired voltage.

Claims

1. A planar multi-junction electrochemical pump for pumping an electrochemically active fluid, the pump comprising:

a container defining an inlet chamber in a first portion thereof and an outlet chamber in a second portion thereof;

a single electrolytic membrane disposed within the container between said chambers and forming therebetween a gastight seal;

a plurality of pairs of electrodes disposed on either side of and in contact with the electrolytic membrane, the electrodes in the inlet chamber being separated from one another by spaces and the electrodes in the outlet chamber being separated from one another by spaces;

means for electrically connecting the electrodes; and

means for applying an electrical voltage to the electrodes to establish a voltage gradient across the membrane to convert the fluid into ions in the inlet chamber, propel the ions through the membrane into the outer chamber, and reconvert the ions into fluid in the outlet chamber whereby the fluid is pumped from the inlet chamber into the outlet chamber.

2. The electrochemical pump of claim 1, and further comprising:

means for supplying the fluid to the inlet chamber.

3. The electrochemical pump of claim 1, and further comprising:

means for withdrawing the fluid from the outlet chamber.

4. The electrochemical pump of claim 1, wherein:

the means for electrically connecting the electrodes includes means for electrically connecting the electrodes in series.

5. The electrochemical pump of claim 1, wherein:

the means for electrically connecting the electrodes includes means for electrically connecting the electrodes in parallel.

6. The electrochemical pump of claim 1, wherein:

each of the electrodes includes a thin film of metal deposited directly on the membrane.

7. The electrochemical pump of claim 1, wherein:

the means for electrically connecting the electrodes includes a plurality of contact pins connecting a plurality of metal traces deposited on the inner face of the container walls.

8. The electrochemical pump of claim 1, wherein:

the electrochemically active fluid includes a reduction/oxidation couple of hydrogen and hydrogen.

9. A planar multi-junction electrochemical fuel cell comprising:

a container defining a first chamber in a first portion thereof and a second chamber in a second portion thereof;

a single electrolytic membrane disposed within the container between said chambers and forming therebetween a gastight seal;

a plurality of pairs of electrodes disposed on either side of and in contact with the electrolytic membrane, the electrodes in the first chamber being separated from one another by spaces and the electrodes in the second chamber being separated from one another by spaces;

means for electrically connecting the electrodes;

means for supplying a fuel gas to the first chamber; and

means for supplying a gaseous oxidant to the second chamber.

10. The electrochemical fuel cell of claim 9, and further comprising:

means for withdrawing from the container the fluid by-product of the generation of electricity.

11. The electrochemical fuel cell of claim 10, wherein:

the means for electrically connecting the electrodes includes means for electrically connecting the electrodes in series.

12. The electrochemical fuel cell of claim 10, wherein:

the means for electrically connecting the electrodes includes means for electrically connecting the electrodes in parallel.

13. The electrochemical fuel cell of claim 10 wherein:

each of the electrodes includes a thin film of metal deposited directly on the membrane.

14. The electrochemical fuel cell of claim 10, wherein:

the fuel gas includes hydrogen.

15. The electrochemical fuel cell of claim 14, wherein:

the gaseous oxidant includes oxygen.

16. A planar multi-junction electrochemical fuel cell comprising:

a container;

an electrolytic membrane disposed within the container, the membrane being fixed within the container so as to form a first and second chamber;

a plurality of pairs of electrodes disposed on either side of and in contact with the electrolytic membrane;

means for electrically connecting the electrodes, including a plurality of contact pins connecting a plurality of metal traces deposited on the inner face of the container walls;

means for supplying a fuel gas to the first chamber;

means for supplying a gaseous oxidant to the second chamber; and

means for withdrawing from the container the fluid byproduct of the generation of electricity.

17. A planar multi-junction electrochemical fuel cell comprising:

a container defining a first chamber in a first portion thereof and a second chamber in a second portion thereof;

a single electrolytic membrane disposed within the container between said chambers and forming therebetween a gas-tight seal;

a plurality of first electrodes in the first chamber disposed on the membrane in spaced-apart relationship to one another, and a like number of second electrodes in the second chamber disposed on the membrane in spaced-apart relationship to one another, each first electrode being in generally parallel relationship with a differenet one of the second electrodes but separated therefrom by the membrane to define an electrode pair, each first electrode being separated from the other first electrodes by a distance greater than the thickness of the membrane, and each second electrode being separated from the other second electrodes by a distance greater than the thickness of the membrane;

an electrically conductive path between a first electrode comprised in one of the electrode pairs and a second electrode comprised in a different one of the electrode pairs whereby said electrode pairs are connected in series;

means for supplying a fuel gas to the first chamber; and

means for supplying a gaseous oxidant to the second chamber.

18. A fuel cell according to claim 17 and further comprising means for withdrawing fluid from the container.

19. A fuel cell according to claim 17 wherein an electrode comprises a thin electrically-conductive layer on the membrane.

20. A fuel cell according to claim 17 wherein the fuel gas comprises hydrogen.

21. A fuel cell according to claim 17 wherein the gaseous oxidant comprises oxygen.

22. A fuel cell according to claim 17 wherein the means for electrically connecting the electrodes includes a plurality of contact pins connecting a plurality of metal traces deposited on the inner face of the container walls.

23. A planar multi-junction electrochemical pump for pumping an electrochemically active fluid, the pump comprising:

a container defining an inlet chamber in a first portion thereof and an outlet chamber in a second portion thereof;

a single electrolytic membrane disposed within the container between said chambers and forming therebetween a gas-tight seal;

a plurality of first electrodes in the inlet chamber disposed on the membrane in spaced-apart relationship to one another, and a like number of second electrodes in the outlet chamber disposed on the membrane in spaced-apart relationship to one another, each first electrode being in generally parallel relationship with a different one of the second electrodes but separated therefrom by the membrane to define an electrode pair, each first electrode being separated from the other first electrodes by a distance greater than the thickness of the membrane, and each second electrode being separated from the other second electrodes by a distance greater than the thickness of the membrane;

an electically conductive path between a first electrode comprised in one of the electrode pairs and a second electrode comprised in a different one of the electrode pairs whereby said electrode pairs are connected in series; and

means for producing a voltage gradient across said series-connected electrode pairs to convert the fluid into ions in the inlet chamber, propel the ions through the membrane into the outlet chamber, and reconvert the ions into fluid in the outlet chamber whereby the fluid is pumped from the inlet chamber into the outlet chamber.

24. A pump according to claim 23 and further comprising means for supplying the fluid to the inlet chamber.

25. A pump according to claim 23 and further comprising means for withdrawing the fluid from the outlet chamber.

26. An electrochemical pump according to claim 23 wherein the electrochemically active fluid comprises hydrogen.

27. An electrochemical pump according to claim 23 wherein the means for electrically connecting the electrodes includes a plurality of contact pins connecting a plurality of metal traces deposited on the inner face of the container walls.

28. A planar multi-junction electrochemical pump for pumping a fluid, the pump comprising:

upper and lower generally annular membrane supports;

an electrolytic membrane fixed between said supports;

an upper segment adjacent the upper membrane support and defining therewith an inlet chamber;

a lower segment adjacent the lower membrane support and defining therewith an outlet chamber separated from the inlet chamber by the membrane;

a plurality of first electodes in the first chamber disposed on the membrane in spaced-apart relationship to one another, and a like number of second electrodes in the second chamber disposed on the membrane in spaced-apart relationship to one another, each first electrode being in generally parallel relationship with a different one of the second electrodes but separated therefrom by the membrane to define an electrode pair, each first electrode being separated from the other first electrodes by a distance greater than the thickness of the membrane, and each second electrode being separated from the other second electrodes by a distance greater than the thickness of the membrane;

an electrically conductive path between a first electrode associated with one of the electrode pairs and a second electrode associated with a different one of the electrode pairs whereby said electrode pairs are connected in series; and

means for applying an electrical voltage to the electrodes to establish a voltage gradient across the membrane to convert the fluid into ions in the inlet chamber, propel the ions through the membrane into the outlet chamber, and reconvert the ions into fluid in the outlet chamber whereby the fluid is pumped from the inlet chamber into the outlet chamber.

29. A pump according to claim 28 wherein the means for electrically connecting the electrodes includes a plurality of contact pins connecting a plurality of metal traces, each trace being in contact with a different one of the electrodes.

30. A pump according to claim 28 and further comprising means for supplying the fluid to the inlet chamber.

31. A pump according to claim 28 and further comprising means for withdrawing the fluid from the outlet chamber.