Cell tester device employing a printed transparent electrically conductive electrode

• US 5,654,640 A
• Filed: 09/08/1995
• Issued: 08/05/1997
• Est. Priority Date: 01/31/1991
• Status: Expired due to Term

• Current Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Original Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Inventors: Bailey, John C.
• Primary Examiner(s): Nguyen, Vinh P.
• Assistant Examiner(s): DO, DIEP N
• Application Number:
  US08/525,888
• Time in Patent Office: 697 Days
• Field of Search: 324/435, 324/96, 324/104, 340/636, 429/90, 429/93, 359/265, 359/269, 359/270, 359/273, 345/87, 345/88, 345/98, 345/104
• US Class Current: 324/435
• CPC Class Codes: G01R 13/403 using passive display devices, e.g. liquid crystal display or Kerr effect display devices
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte
• CPC Class Codes: G02F 1/153 Constructional details
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/488 Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 6/505 Cells combined with indicating means for external visualization of the condition, e.g. by change of colour or of light intensity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A cell tester device for use on an electrochemical cell which comprises a printed transparent electrically conductive electrode disposed on a plastic film, an ionically conductive electrochromic electrolyte printed on the electrode, and a conductive layer printed on the electrolyte.

Claims

1. A cell tester device for an electrochemical cell having a first terminal and a second terminal of opposite polarity in which the cell tester device comprises a translucent plastic layer;

a transparent electrically conductive electrode printed on the plastic layer and adapted to make electrical contact with the first terminal of the cell;

an ionically conductive electrolyte layer disposed on the transparent electrically conductive electrode and said electrolyte containing at least one electrochromic material that undergoes a visible change in color as the result of a chemical reaction in response to an applied potential voltage; and

a conductive layer disposed over the electrolyte and adapted to make contact with the second terminal of the cell so that when the conductive means of the transparent electrically conductive electrode makes electrical contact with the first terminal of the cell and the conductive layer makes electrical contact with the second terminal of the cell, the electrochromic material will undergo a visible change that can be seen through the transparent electrically conductive electrode.

2. The cell tester device of claim 1 wherein the electrolyte layer is a printed electrolyte layer.

3. The cell tester device of claim 1 wherein the conductive layer is a printed conductive layer.

4. The cell tester device of claim 3 wherein the electrolyte layer is a printed electrolyte layer.

5. The cell tester device of claim 4 wherein the transparent electrically conductive printed electrode is between 0.1 to 20 microns thick.

6. The cell tester device of claim 5 wherein the electrolyte printed layer is between 1 to 200 microns thick.

7. The cell tester device of claim 6 wherein the conductive printed layer is between 2 to 200 microns thick.

8. The cell tester device of claim 1 wherein the transparent electrically conductive electrode is an indium-tin oxide material.

9. The cell tester device of claim 1 where conductive means is provided as a second conductive layer in contact with the transparent electrically conductive electrode.

10. The cell tester device of claim 9 wherein the second conductive layer is selected from the group consisting of carbon, silver, nickel, titanium and electrically conductive polymers.

11. The cell tester device of claim 1 wherein the electrolyte comprises hydroxyethyl cellulose, hydroxypropyl cellulose, polyvinylalcohol or PEO;

a TiO₂ pigment, and a bismuth, copper or bromine salt or combinations of salts.

12. The cell tester device of claim 1 wherein the electrolyte contains a binder and a color pigment.

13. The cell tester device of claim 12 wherein the color pigment in the electrolyte TiO₂ pigment.

14. The cell tester device of claim 1 wherein the transparent electrically conductive electrode comprises indium-tin oxide.

15. The cell tester device of claim 4 wherein the transparent electrically conductive printed electrode is from 0.1 to 20 microns thick, the conductive printed layer is from 2 to 200 microns thick and the ionically conductive printed electrolyte is from 1 to 200 microns thick.

16. A method of producing a printed cell tester device comprising the steps:

(a) printing a transparent electrically conductive electrode ink with conductive means on a transparent plastic film;

(b) printing an ionically conductive electrolyte ink on the printed transparent electrically conductive electrode; and

(c) printing a conductive ink on the printed ionically conductive electrolyte.

17. The method of claim 16 wherein after step (c) assembling the printed components onto an electrochemical cell.

18. The method of claim 17 wherein the printed transparent electrically conductive electrode is between 0.1 to 20 microns thick, the printed ionically conductive electrolyte is between 1 to 200 microns thick, and the printed conductive layer is between 2 to 200 microns thick.

19. The method of claim 18 wherein the transparent electrically conductive electrode comprises indium-tin oxide.

20. The method of claim 18 wherein the printed transparent electrically conductive electrode, the printed electrolyte ink and printed conductive ink is between 20 and 800 microns thick.