Uniformly wound battery

• US 8,080,329 B1
• Filed: 03/25/2004
• Issued: 12/20/2011
• Est. Priority Date: 03/25/2004
• Status: Active Grant

• Current Assignee: Quallion, LLC (EnerSys)
• Original Assignee: Quallion, LLC (EnerSys)
• Inventors: Skinlo, David M., Yumoto, Hiroyuki, Nat, Baljit S.
• Primary Examiner(s): Hodge, R
• Application Number:
  US10/810,075
• Time in Patent Office: 2,826 Days
• Field of Search: None
• US Class Current: 429/130
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 50/409 Separators, membranes or diaphragms characterised by the material
• CPC Class Codes: H01M 50/466 U-shaped, bag-shaped or folded
• CPC Class Codes: H01M 50/469 tubular or cylindrical
• CPC Class Codes: H01M 6/10 with wound or folded 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

Abstract

Disclosed is an electric storage battery and method of making it, comprising a jellyroll electrode assembly in which electrodes are wound around a pin, and having one or more spacers at or near the inner ends of the electrodes to aid in winding the jellyroll. Also disclosed is an electric storage battery, and method of making it, comprising a jellyroll electrode assembly in which electrodes are wound around a pin, and having a plastic slotted tube closely fitted around the pin and covering the junction of the pin to an electrode substrate or interface material coupled to the electrode substrate. The spacers and plastic slotted tube may be used separately or together.

Claims

1. An electric storage battery, comprising:

an electrode assembly in a case, the electrode assembly including;

an elongate pin;

first electrode strip and a second electrode strip wound together to form a spiral roll, each electrode strip having inner and outer ends,

the first electrode strip attached to the pin directly or via an interface material;

the first electrode strip including

a substrate having a first face and a second face,

the first face having a coated portion coated by a coating having a coating thickness,

the first face having an uncoated portion on which the coating is not positioned,

the uncoated portion being at the inner end of the first electrode strip,

the coating including an active material;

a first insulating spacer positioned on at least a portion of the uncoated portion and/or on at least a portion of the interface material,

the first insulating spacer in a space between the first face of the substrate and the second electrode strip;

a separator in the space between the first face of the substrate and the second electrode strip; and

the substrate is not present in the space between the first face of the substrate and the second electrode strip.

2. The battery of claim 1, wherein the second face has a second coated portion coated by the coating and a second uncoated portion,

the second uncoated portion being at the inner end of the first electrode strip, and further comprising

a second insulating spacer positioned on at least a portion of the second uncoated portion and/or on at least a portion of the interface material.

3. The battery of claim 1, wherein the spacer has a thickness approximately equal to the coating thickness.

4. The battery of claim 1, wherein the spacer comprises polyimide.

5. The battery of claim 1, further comprising:

a second separator separating the electrode strips.

6. The battery of claim 1, further comprising:

a nonconductive slotted tube closely fitted around the pin and covering a junction between the pin and the first electrode strip or between the pin and interface material.

7. The battery of claim 6, wherein the slotted tube includes polypropylene.

8. The battery of claim 1, wherein the first insulating spacer is positioned on at least a portion of the uncoated portion.

9. The battery of claim 1, wherein the first insulating spacer is positioned on at least a portion of the interface material.

10. The battery of claim 1, wherein the first electrode strip is directly attached to the pin.

11. The battery of claim 1, wherein the first electrode strip is attached to the pin via the interface material.

12. The battery of claim 1, wherein a portion of the separator is between the second electrode and the first insulating spacer.

13. The battery of claim 1, wherein the coating is not positioned between the spacer and the first face of the substrate.

14. An electric storage battery, comprising:

an electrode assembly in a case, the electrode assembly including;

an elongate pin; and

first and second opposite polarity electrode strips wound together to form a spiral roll, each electrode strip having inner and outer ends, the first electrode strip being attached to the pin directly or via an interface material; and

a nonconductive slotted tube closely fitted around said pin and covering a junction between the pin and the first electrode strip or between the pin and interface material.

15. The battery of claim 14, wherein the slotted tube includes polypropylene.

16. The battery of claim 14, wherein the slotted tube has a wall thickness of 0.5 to 0.75 mm.