Process for filling electrochemical cells with electrolyte

• US 5,865,860 A
• Filed: 06/20/1997
• Issued: 02/02/1999
• Est. Priority Date: 06/20/1997
• Status: Expired due to Fees

• Current Assignee: IMRA America Incorporated (Aisin Corp.)
• Original Assignee: IMRA America Incorporated (Aisin Corp.)
• Inventors: Delnick, Frank M.
• Primary Examiner(s): Gorgos, Kathryn
• Assistant Examiner(s): Nicolas, Wesley A.
• Application Number:
  US08/879,936
• Time in Patent Office: 592 Days
• Field of Search: 429/50, 429/51, 429/52, 429/80, 429/124, 429/137, 429/189, 429/194, 29/890.1, 29/623.1, 29/623.5, 347/5
• US Class Current: 29/623.5
• CPC Class Codes: B41J 2/01 Ink jet
• CPC Class Codes: H01M 4/04 Processes of manufacture in general
• CPC Class Codes: H01M 50/609 Arrangements or processes for filling with liquid, e.g. electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

A process for manufacturing an electrochemical cell comprising the steps of providing an electrode and applying electrolyte to the electrode using an ink-jet printer. In the preferred embodiment of the present invention, an ink-jet printing process is utilized to print the electrolyte onto the surface of the electrodes and separators or the electrode/separator bilayers. The ink-jet printing accurately meters and uniformly distributes the electrolyte throughout the pore structure of the separator and the electrode without contaminating the cell gasket. Preferably, a drop-on-demand ink-jet printing head is used to facilitate the electrolyte printing process. The ink-jet printing head is electronically pulsed to form and eject the electrolyte droplets from a nozzle of printing-head. The volume and the distribution of each electrolyte droplet are accurately determined and controlled by varying the pulse width and the pulse frequency of the printing head.

Claims

1. A process for manufacturing an electrochemical cell, comprising:

providing an electrode; and

applying electrolyte to said electrode using an ink-jet printer.

2. The process of claim 1 wherein said step of applying electrolyte to said electrode comprises printing drops of said electrolyte on said electrode.

3. The process of claim 2 wherein said printing of drops of said electrolyte comprises forming a dot matrix image of said electrolyte on said electrode.

4. The process of claim 3 wherein said drops of said electrolyte have a known volume.

5. The process of claim 4 wherein said known volume of said drops is adjusted by varying a pulse applied to said ink-jet printer.

6. A process for filling an electrochemical cell with electrolyte, comprising:

providing a porous separator layer; and

placing said electrolyte in a selected pattern on said separator layer using an ink-jet printer.

7. The process of claim 6, wherein said step of placing said electrolyte in a selected patten comprises forming a dot matrix image of said electrolyte on said separator.

8. The process of claim 7, wherein said dot matrix image is comprised of a combination of individual electrolyte drops.

9. The process of claim 8, wherein said individual drops comprise a known volume.

10. The process of claim 9, wherein said known volume of said individual drops is adjusted by varying a pulse applied to said ink-jet printer.

11. An ink jet printing cartridge, comprising:

an ink jet printing nozzle for ejecting electrochemical cell electrolyte consisting essentially of at least one salt and at least one solven; and

a source of said electrochemical cell electrolyte is connected to said nozzle.

12. The ink jet printing cartridge of claim 11, wherein said electrolyte is ejected by applying a pulse to said source of electrochemical cell electrolyte so that discrete drops of said electrolyte ejected through said ink jet printing nozzle.

13. The ink jet printing cartridge of claim 12, wherein said discrete drops comprise a known volume.

14. The ink jet printing cartridge of claim 13, wherein said known volume of said discrete drops is adjusted by varying said pulse applied to said source of electrolyte.

16. The process of claim 14, wherein said step of ejecting said electrolyte comprises applying a pulse to said source tank to eject said electrolyte in discrete drops through said nozzle.

15. A process of distributing electrolyte in a selected pattern comprising the steps of:

placing said electrolyte into a source tank of an ink-jet printer; and

ejecting said electrolyte through a nozzle in said selected pattern wherein said nozzle is connected to said source tank.

17. The process of claim 15, wherein said discrete drops comprise a known volume.

18. The process of claim 17, wherein said volume of said discrete drops is adjusted by varying said pulse applied to said source tank.