Methods of preparing a safety battery

Patent metadata

Field	Value
Publication number	US-10826050-B1
Application number	US-201816016452-A
Country	US
Kind code	B1
Filing date	Jun 22, 2018
Priority date	Aug 15, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present invention relates, in part, to methods of preparing a safety battery. Methods can include dispensing a safety ink formulation between the two poles of a battery. Upon exposure to moisture, the formulation provides an electrical connection between two poles, thus minimizing electrical discharge and/or reducing the formation of electrochemically generated ions at the pole(s).

First claim

The invention claimed is:

1. A method of preparing a safety battery, the method comprising:
providing a battery on a stage, wherein the battery comprises a negative pole, a positive pole, and a separated region configured to electrically separate the negative pole from the positive pole; and
dispensing a safety ink formulation from a stationary dispenser, thereby printing a microdeposited safety ink formulation within the separated region and providing a physical connection between the negative pole and the positive pole,
wherein the microdeposited safety ink formulation comprises one or more water permeable polymers and a metal reactant configured to form an electrical connection between the negative pole and the positive pole upon exposure to moisture.

2. The method of claim 1 , wherein the dispensing step comprises dispensing the safety ink formulation from the stationary dispenser while rotating the stage.

3. The method of claim 1 , further comprising, after the dispensing step:
spinning the battery comprising the microdeposited safety ink formulation, thereby displacing the formulation across a surface portion of the negative pole and/or the positive pole.

4. The method of claim 1 , wherein the metal reactant comprises one or more metal salts.

5. The method of claim 4 , wherein the microdeposited safety ink formulation further comprises a reducing agent configured to reduce the one or more metal salts to provide a conductive agent that forms the electrical connection between the negative pole and the positive pole upon exposure of the microdeposited safety ink formulation to moisture.

6. The method of claim 5 , wherein the microdeposited safety ink formulation comprises of from about 5 wt. % to about 95 wt. % of the one or more metal salts and about 5 wt. % to about 95 wt. % of the one or more water permeable polymers.

7. The method of claim 1 , wherein the safety ink formulation comprises the metal reactant, the one or more water permeable polymers, one or more optional reducing agents, one or more optional water-soluble salts, one or more optional non-metal salts, one or more optional additives, one or more optional pigments, and one or more optional solvents.

8. The method of claim 7 , wherein the safety ink formulation comprises of from about 5 wt. % to about 95 wt. % of the metal reactant and about 5 wt. % to about 95 wt. % of the one or more water permeable polymers.

9. The method of claim 7 , wherein the safety ink formulation comprises of from about 20 wt. % to about 95 wt. % of the metal reactant, about 5 wt. % to about 60 wt. % of the one or more water permeable polymers, about 20 wt. % to about 95 wt. % of the one or more reducing agents, 0 wt. % to about 95 wt. % of the one or more water-soluble salts, 0 wt. % to about 95 wt. % of the one or more non-metal salts, 0 wt. % to about 5 wt. % of the one or more additives, and 0 wt. % to about 30 wt. % of the one or more pigments.

10. The method of claim 7 , wherein the safety ink formulation has a viscosity of from about 100 cP to about 5000 cP.

11. The method of claim 1 , wherein the stationary dispenser comprises a droplet dispenser, aerosol dispenser, ink jet printer, or direct ink printer.

12. The method of claim 1 , wherein the microdeposited safety ink formulation has a dimension of from about 30 μm to about 2.0 mm in width corresponding to the separated region and configured to provide the physical connection between the negative pole and the positive pole through the separated region.

13. The method of claim 1 , wherein the dispensing step comprises direct writing, aerosol printing, ink jet printing, contact printing, flexographic printing, pad printing, gravure printing, or sticker application.

14. The method of claim 1 , wherein the one or more water permeable polymers comprises poly(ethylene glycol), poly(ethylene oxide), poly(vinyl alcohol), poly(vinyl acetate), poly(methyl methacrylate), poly(ethyl methacrylate), poly(dimethyl siloxane), cellulose, cellulose acetate, polystyrene, poly(vinyl chloride), polyacrylic acid, polyacrylamide, poly(N-isopropylacrylamide), polyacrylate, poly(propylene maleate), poly(propylene fumarate), hyaluronic acid, alginate, agarose, chitin, chitosan, fibrin, albumin, poly(caprolactone), poly(lactic acid), poly(glycolic acid), polyamide, poly(lysine), polyvinylester, polyvinyl pyrrolidone, pullulan, gelatin, hydroxylpropylmethyl cellulose, hydroxypropylcellulose, polysaccharide, and combinations or copolymers thereof or graft forms thereof or linker forms thereof or cross-linked forms thereof.

15. The method of claim 1 , wherein the one or more water permeable polymers comprises polymethacrylates, polyvinyl alcohols, acrylate copolymers, polyvinyl esters, poly(vinyl butyrate), poly(vinyl propionate), and poly(vinyl formate)), water-soluble natural polymers, as well as copolymers thereof or combinations or cross-linked forms thereof.

16. The method of claim 5 , wherein the metal reducing agent comprises an organic reducing agent, inorganic reducing agent, or particles of a metallic element or a metal alloy in its fully reduced state.

17. A safety battery manufactured using a method according to claim 1 , comprising:
a negative pole;
a positive pole separated from the negative pole by a separated region; and a microdeposited safety ink comprising a metal reactant configured to form an electrical connection between the negative pole and the positive pole upon exposure to moisture,
wherein the microdeposited safety ink is disposed within the separated region, thereby providing a physical connection between the negative pole and the positive pole.

18. The battery of claim 17 , wherein the microdeposited safety ink has a dimension of from about 200 μm to about 1.0 mm configured to provide the physical connection between the negative pole and the positive pole through the separated region.

19. The battery of claim 17 , wherein the metal reactant comprises one or more metal salts.

20. The battery of claim 19 , wherein the microdeposited safety ink further comprises a reducing agent configured to reduce the one or more metal salts to provide a conductive agent that forms the electrical connection between the negative pole and the positive pole upon exposure to moisture.

21. The battery of claim 19 , wherein the microdeposited safety ink comprises of from about 5 wt. % to about 95 wt. % of the one or more metal salts and about 5 wt. % to about 95 wt. % of one or more polymers.

Assignees

• Nat Tech & Eng Solutions Sandia Llc
• Duracell Us Operations Inc

Inventors

• Kaehr Bryan James
• Paxton Walter F
• Cook Adam
• Reinholtz William
• Pozin Michael

Classifications

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M50/574 Primary

  Devices or arrangements for the interruption of current · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/109

  of button or coin shape · CPC title

• H01M10/0427

  Button cells · CPC title