Electrode assembly including mandrel having removable portion

Patent metadata

Field	Value
Publication number	US-9054387-B2
Application number	US-201113044178-A
Country	US
Kind code	B2
Filing date	Mar 9, 2011
Priority date	Apr 7, 2010
Publication date	Jun 9, 2015
Grant date	Jun 9, 2015

Abstract

Provided is an electric storage battery including a jelly roll type electrode assembly having a mandrel. The mandrel includes a positive portion, a negative portion and a removable portion. In some embodiments, the mandrel is planar having two faces with a groove on each of the positive and negative portions. The grooves can be on the same or different faces of the mandrel. The grooves are dimensioned to accommodate a positive and negative feedthrough pin. The electrodes are wrapped around the mandrel using the removable portion to wind the mandrel. Once wrapped, the removable portion can be detached. The positive portion and the negative portion are left in the electrode assembly insulated from each other. The mandrel allows tighter wrapping of the jelly roll assembly, increasing battery miniaturization and also results in electrode assemblies in which after-placement of tabs does not result in burrs or shorting.

First claim

What is claimed is:

1. An electrode assembly comprising:
a mandrel comprising a positive portion, a negative portion, a breakaway incision and one or more removable portions;
wherein the positive portion and negative portion are adjacent to and connected to the one or more removable portions; and
wherein the mandrel includes a passage from a first face of the mandrel to a second face of the mandrel dividing the positive and negative portions;
a positive electrode attached to the positive portion;
a negative electrode attached to the negative portion;
a positive feedthrough pin; and
a negative feedthrough pin;
wherein the positive portion has a groove configured to accept the positive feedthrough pin and the negative portion has a groove configured to accept the negative feedthrough pin;
wherein the positive electrode and the positive feedthrough pin are conductively connected electrically to the mandrel on the positive portion;
wherein the negative electrode and the negative feedthrough pin are conductively connected electrically to the mandrel on the negative portion; and
wherein the one or more removable portions are detachable by the breakaway incision.

2. The electrode assembly of claim 1 , wherein the one or more removable portions connect the positive portion and the negative portion.

3. The electrode assembly of claim 1 , wherein the positive and negative feedthrough pins are independently selected from steel, platinum, aluminum, titanium, niobium, molybdenum, platinum-iridium, and copper and their alloys.

4. The electrode assembly of claim 1 , wherein the positive and negative electrode materials are independently selected from aluminum, steel, silver, copper, nickel, titanium or alloys thereof.

5. The electrode assembly of claim 4 , wherein the positive electrode is coated with a positive active material selected from lithium cobalt oxide, carbon monofluoride, silver vanadium oxide, or combinations thereof.

6. The electrode assembly of claim 4 , wherein the negative electrode is coated with a negative active material selected from lithium titanate, artificial graphite powder, lithium or combinations thereof.

7. The electrode assembly of claim 1 , wherein the mandrel is formed from an electrically conductive material selected from stainless steel, aluminum, titanium, nickel, copper or combinations thereof.

8. The electrode assembly of claim 1 , wherein the mandrel is formed from a non-electrically conductive material selected from polypropylene, polyethylene, or poly(ethylene-co-tetrafluoroethylene).

9. The electrode assembly of claim 1 , wherein the positive feedthrough pin is placed in the groove in the positive portion and negative feedthrough pin is placed in the groove in the negative portion.

10. The electrode assembly of claim 1 , wherein the positive, the negative electrode, or both is/are interposed in the groove between the positive feedthrough pin or negative feedthrough pin and the mandrel.

11. The electrode assembly of claim 1 , wherein the mandrel is planar.

12. A method of preparing an electrode assembly comprising:
providing a mandrel comprising a positive portion, a negative portion, a breakaway incision and one or more removable portions;
wherein the positive portion and negative portion are adjacent to and connected to the one or more removable portions; and
wherein the mandrel includes a passage from a first face of the mandrel to a second face of the mandrel dividing the positive and negative portions;
providing a positive electrode;
providing a negative electrode;
providing a positive feedthrough pin;
providing a negative feedthrough pin;
providing a groove on the positive portion configured to accept the positive feedthrough pin;
providing a groove on the negative portion configured to accept the negative feedthrough pin;
conductively connecting electrically the positive feedthrough pin and the positive electrode to the positive portion of the mandrel;
conductively connecting electrically the negative feedthrough pin and the negative electrode to the negative portion of the mandrel; and
wherein the one or more removable portions are detachable by the breakaway incision.

13. The method of preparing an electrode assembly of claim 12 , wherein the one or more removable portions connect the positive portion and the negative portion.

14. The method of preparing an electrode assembly of claim 12 , wherein the positive and negative feedthrough pins are independently selected from steel, platinum, aluminum, titanium, niobium, molybdenum, platinum-iridium, and copper and their alloys.

15. The method of preparing an electrode assembly of claim 12 , wherein the positive and negative electrode materials are independently selected from aluminum, steel, silver, copper, nickel, titanium, or alloys thereof.

16. The method of preparing an electrode assembly of claim 15 , wherein the positive electrode is coated with a positive active material selected from lithium cobalt oxide, carbon monofluoride, silver vanadium oxide, or combinations thereof.

17. The method of preparing an electrode assembly of claim 15 , wherein the negative electrode is coated with a negative active material selected from lithium titanate, artificial graphite powder, lithium, or combinations thereof.

18. The method of preparing an electrode assembly of claim 12 , wherein the mandrel is formed from an electrically conductive material selected from stainless steel, aluminum, titanium, nickel, copper, or combinations thereof.

19. The method of preparing an electrode assembly of claim 12 , wherein the mandrel is formed from a non-electrically conductive material selected from polypropylene, polyethylene, or poly(ethylene-co-tetrafluoroethylene).

20. The method of preparing an electrode assembly of claim 12 , further comprising the steps of placing the positive feedthrough pin in the positive portion groove and placing the negative feedthrough pin in the negative portion groove.

21. The method of preparing an electrode assembly of claim 12 , wherein the positive electrode, the negative electrode, or both is/are interposed in the groove between the positive feedthrough pin or negative feedthrough pin and the mandrel.

22. The method of preparing an electrode assembly of claim 12 , wherein the mandrel is planar.

Assignees

• Viavattine Joseph J
• Aamodt Paul B
• Zhao Hailiang Jeff
• Medtronic Inc

Inventors

• Viavattine Joseph J
• Aamodt Paul B
• Zhao Hailiang Jeff

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/286

  Cells or batteries with wound or folded electrodes · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/287

  Small-sized flat cells or batteries for portable equipment (H01M10/283 and H01M10/286 take precedence) · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title