Bipolar electrochemical battery of stacked wafer cells

• US 6,503,658 B1
• Filed: 07/11/2001
• Issued: 01/07/2003
• Est. Priority Date: 07/11/2001
• Status: Expired due to Fees

• Current Assignee: Electro Energy, Inc. (Delaware)
• Original Assignee: Electro Energy, Inc. (Delaware)
• Inventors: Klein, Martin G., Ralston, Paula, Plivelich, Robert
• Primary Examiner(s): Kalafut, Stephen
• Assistant Examiner(s): Martin, Angela J.
• Application Number:
  US09/902,871
• Publication Number:
  US 20030013015A1
• Time in Patent Office: 545 Days
• Field of Search: 429/157, 429/210, 429/162, 429/124, 429/127, 429/82, 429/176, 296/231, 296/233
• US Class Current: 429/210
• CPC Class Codes: H01M 10/0418 with bipolar electrodes
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/51 Connection only in series
• CPC Class Codes: H01M 6/42 Grouping of primary cells into batteries H01M6/40 takes precedence
• CPC Class Codes: H01M 6/46 of flat cells
• CPC Class Codes: H01M 6/48 with bipolar electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/4911 including sealing
• CPC Class Codes: Y10T 29/49112 including laminating of indefinite length material

Abstract

The bipolar electrochemical battery of the invention comprises:

a stack of at least two electrochemical cells electrically arranged in series with the positive face of each cell contacting the negative face of an adjacent cell, wherein each of the cells comprises

(a) a negative electrode;

(b) a positive electrode;

(c) a separator between the electrodes, wherein the separator includes an electrolyte;

(d) a first electrically conductive lamination comprising a first inner metal layer and a first polymeric outer layer, said first polymeric outer layer having at least one perforation therein to expose the first inner metal layer, said first electrically conductive lamination being in electrical contact with the outer face of the negative electrode; and

(e) a second electrically conductive lamination comprising a second inner metal layer and a second polymeric outer layer, said second polymeric outer layer having at least one perforation therein to expose the second inner metal layer, said second electrically conductive lamination being in electrical contact with the outer face of the positive electrode; wherein the first and second laminations are sealed peripherally to each other to form an enclosure including the electrodes, the separator and the electrolyte.

Claims

1. A bipolar electrochemical battery comprising:

a stack of at least two electrochemical cells electrically arranged in series with the positive face of each cell contacting the negative face of an adjacent cell, wherein each of the cells comprises

(a) a negative electrode;

(b) a positive electrode;

(c) a separator between the electrodes, wherein the separator includes an electrolyte;

(d) a first electrically conductive lamination comprising a first, inner metal layer and a first polymeric outer layer, said first polymeric outer layer having at least one perforation therein to expose the first, inner metal layer, said first electrically conductive lamination being in electrical contact with the outer face of the negative electrode; and

(e) a second electrically conductive lamination comprising a second, inner metal layer and a second polymeric outer layer, said second polymeric outer layer having at least one perforation therein to expose the second, inner metal layer, said second electrically conductive lamination being in electrical contact with the outer face of the positive electrode;

wherein the first and second laminations are sealed peripherally to each other to form an enclosure including the electrodes, the separator and the electrolyte.

2. The bipolar electrochemical battery of claim 1 wherein said electrodes, said separator and said first and second laminations are each substantially flat.

3. The bipolar electrochemical battery of claim 1 wherein said first and second inner metal layers are each a metal foil.

4. The bipolar electrochemical battery of claim 1 wherein the metal layer is between about 0.0003 inches and about 0.005 inches thick.

5. The bipolar electrochemical battery of claim 1 wherein the metal layer is made of a metal selected from copper, aluminum, silver, steel, lithium, nickel, metal plated materials and mixtures thereof.

6. The bipolar electrochemical battery of claim 1 wherein said first and second polymeric outer layers are each made of a polymeric material selected from polypropylene, polyethylene, polysulfone, polyvinyl chloride and mixtures thereof.

7. The bipolar electrochemical battery of claim 6 wherein said first and second polymeric outer layers are each a thin polymeric film between about 0.001 inches and about 0.005 inches in thickness.

8. The bipolar electrochemical battery of claim 1 wherein said first and second polymeric outer layers each comprise a plurality of perforations which are aligned with respect to each other to create contacts points through which current can flow from cell to cell.

9. The bipolar electrochemical battery of claim 1 wherein said positive electrode comprises a material selected from oxygen, magnesium, nickel, manganese, copper, cobalt, silver, lithium, an oxide or hydroxide of nickel, an oxide or hydroxide of manganese, an oxide or hydroxide of copper, an oxide or hydroxide of mercury, an oxide or hydroxide of silver, an oxide or hydroxide of magnesium, an oxide or hydroxide of lithium, an oxide or hydroxide of cobalt and combinations thereof.

10. The bipolar electrochemical battery of claim 9 wherein said positive electrode is an oxygen electrode or a nickel electrode.

11. The bipolar electrochemical battery of claim 3 wherein at least one metal foil and polymeric layer are bonded together with tar, epoxy or rubber cement.

12. The bipolar electrochemical battery of claim 11 wherein said nickel electrode is selected from a pasted foam, sintered and plastic bonded nickel electrode.

13. The bipolar electrochemical battery of claim 1 wherein said negative electrode comprises a material selected from cadmium, iron, zinc, silver, lithium, carbon containing lithium, hydrogen and mixtures thereof.

14. The bipolar electrochemical battery of claim 1 wherein said negative electrode is a metal hydride electrode.

15. The bipolar electrochemical battery of claim 14 wherein the metal hydride electrode is selected from the group consisting of a nickel hydride electrode, a copper hydride electrode, a lithium hydride electrode, an iron hydride electrode and mixtures thereof.

16. The bipolar electrochemical battery of claim 1 wherein the separator is porous.

17. The bipolar electrochemical battery of claim 1 wherein the first and second polymeric outer layers are sealed to each other to form the enclosure.

18. The bipolar electrochemical battery of claim 1 wherein a conductive paste or cement is present between at least one of said metal layers and said electrode with which it is in contact.

19. The bipolar electrochemical battery of claim 1 wherein said stack of at least two electrochemical cells is contained in a battery housing.

20. The bipolar electrochemical battery of claim 19 wherein a pressure measuring device is included in said sealed battery housing.

21. The bipolar electrochemical battery of claim 19 wherein each electrochemical cell is completely sealed.

22. The bipolar electrochemical battery of claim 19 wherein a conductive paste or cement is present between said cells.

23. The bipolar electrochemical battery of claim 19 wherein at least one of the end cells of said stack of cells is in contact with a metal foil contact, wherein said metal foil contact is electrically connected to a battery terminal.

24. The bipolar electrochemical battery of claim 19 wherein said stack of cells is held in compression.

25. The bipolar electrochemical battery of claim 19 wherein said electrochemical cells include vent ports.

26. The bipolar electrochemical battery of claim 19 wherein a plurality of cells are held in compression.

27. The bipolar electrochemical battery of claim 26 wherein the cells are held in compression by a gas filled bladder.

28. The bipolar electrochemical battery of claim 19 wherein a metal foil layer is placed between cells for thermal conduction.

29. The bipolar electrochemical batter of claim 19 wherein a cell edge is extended for improved thermal contact to battery housing walls.

30. The bipolar electrochemical battery of claim 19 wherein the battery is contained in a housing with a honeycomb plate for lightweight ridge containment of a cell stack.

31. The electrochemical wafer cell of claim 30 wherein the first inner metal layer and the first polymeric outer layer are boned together with tar, epoxy or rubber cement, and the second inner metal layer and the second polymeric outer layer are bonded together with tar, epoxy or rubber cement.

32. An electrochemical wafer cell comprising:

(a) a negative electrode;

(b) a positive electrode;

(c) a separator between the electrodes, wherein the separator comprises an electrolyte;

(d) a first electrically conductive lamination comprising a first inner metal layer and a first polymeric outer layer, said first polymeric outer layer having at least one perforation therein to expose the first inner metal layer, said first electrically conductive lamination being in electrical contact with the outer face of the negative electrode; and

(e) a second electrically conductive lamination comprising a second inner metal layer and a second polymeric outer layer, said second polymeric outer layer having at least one perforation therein to expose the second inner metal layer, said second electrically conductive lamination being in electrical contact with the outer face of the positive electrode;

wherein the first and second laminations are sealed peripherally to each other to form an enclosure including the electrodes, the separator and the electrolyte.

35. The electrochemical wafer cell of claim 32 wherein the cell has extended edges.

33. An assembly for containing contents of a wafer cell, comprising:

(a) a first electrically conductive lamination comprising a first inner metal layer and a first polymeric outer layer, said first polymeric outer layer having at least one perforation therein to expose the first inner metal layer, said first electrically conductive lamination capable of being in electrical contact with a negative electrode; and

(b) a second electrically conductive lamination comprising a second inner metal layer and a second polymeric outer layer, said second polymeric outer layer having at least one perforation therein to expose the second inner metal layer, said second electrically conductive lamination capable being in electrical contact with a positive electrode, wherein the first and second laminations are capable of being sealed peripherally to each other to form an assembly for containing the contents of a wafer cell.

34. A method of making a bipolar electrochemical battery comprising the steps of:

providing a stack of at least two electrochemical cells electrically arranged in series with the positive face of each cell contacting the negative face of an adjacent cell, wherein each of the cells comprises

(a) a negative electrode;

(b) a positive electrode;

(c) a separator between the electrodes, wherein the separator comprises an electrolyte;

(d) a first electrically conductive lamination comprising a first, inner metal layer and a first polymeric outer layer, said first polymeric outer layer having at least one perforation therein to expose the first, inner metal layer, said first electrically conductive lamination being in electrical contact with the outer face of the negative electrode; and

(e) a second electrically conductive lamination comprising a second, inner metal layer and a second polymeric outer layer, said second polymeric outer layer having at least one perforation therein to expose the second, inner metal layer, said second electrically conductive lamination being in electrical contact with the outer face of the positive electrode; and

sealing the first and second laminations peripherally to each other to form an enclosure including the electrodes, the separator and the electrolyte.