Spirally-rolled electrodes with separator and the batteries therewith

• US 20020076606A1
• Filed: 05/25/2001
• Published: 06/20/2002
• Est. Priority Date: 10/26/2000
• Status: Active Grant

• Current Assignee: Japan Capacitor Industrial Co., Ltd.
• Original Assignee: Isao Matsumoto
• Inventors: Matsumoto, Isao
• Granted Patent: US 7,087,345 B2
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• 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 10/286 Cells or batteries with wound or folded electrodes
• CPC Class Codes: H01M 10/30 Nickel accumulators H01M10/34 takes precedence
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2006/106 Elliptic wound cells
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/566 by welding, soldering or brazing
• 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

Spirally-rolled electrodes for batteries wherein the electrodes having a concentric circle shape or an elliptic shape with positive electrode and negative electrode wound spirally via a separator therebetween has the characteristics as below:

(1) the positive electrode and/or negative electrode consist of the combinations of several electrode plates;

(2) each of the combinations in the positive electrode and/or the negative electrode so includes that the total amount of the active material or pseudo-active material which are the main materials for the electrode is substantially constant and;

(3) each electrode plate in the electrode including plural electrodes is wound in series with an interval therebetween.

Claims

1. Spirally-rolled electrodes for batteries having a concentric circle shape or an elliptic shape with positive electrodes, negative electrodes and a separator therebetween, wherein;

(1) the said positive electrode and/or negative electrode comprise the combinations of plural electrode plates;

(2) each of the said combinations in the said positive electrode and/or the said negative electrode is constituted so that the total amount of the active material or pseudo-active material which are the main materials is substantially constant and;

(3) each electrode plate in the electrode comprising plural electrode plates is wound in series with an interval therebetween.

2. Spirally-rolled electrodes for batteries as set forth in claim 1, wherein each of the plural electrode plates comprising the said positive electrode and/or negative electrode has a lead terminal or a terminal equivalent to a lead terminal respectively.

3. Spirally-rolled electrodes for batteries as set forth in claim 1, wherein each of the plural electrode plates comprising at least in the said positive electrode has a metal foil without active materials along the edge of one side in the winding direction and the said metal foil exposed over a separator.

4. Spirally-rolled electrodes for batteries wherein the electrodes for batteries having a concentric circle shape or an elliptic shape with a thin nickel positive electrode and a thin metal hydride negative electrode which are wound spirally interposing a separator therebetween has the characteristics as below:

(1) the said thin nickel positive electrode is the electrode around which plural positive electrode plates are wound in series in order;

(2) the said thin metal hydride negative electrode is the electrode around which one or plural negative electrodes are wound in series in order;

(3) plural electrode plates in each electrode are so combined that the total amount of the active material or pseudo-active material is substantially constant;

(4) plural electrode plates in each electrode are wound in series with an interval therebetween and;

(5) the thickness of an electrode at the side where the winding starts is thinner than the thickness of an electrode at the side where the winding ends in several electrode plates in an electrode comprising several electrode plates.

5. Spirally-rolled electrodes for batteries as set forth in claim 4, wherein each of the several electrode plates comprising the said positive electrode and the said negative electrode has at least two chamfered corners.

6. Spirally-rolled electrodes for batteries as set forth in claim 4, wherein the interval among the plural electrode plates comprising the said positive electrode and/or negative electrode is within the range of 1.0-5.0 mm.

7. Spirally-rolled electrodes for batteries as set forth in claim 4, wherein each of the several electrodes themselves has substantially the same area.

8. A secondary battery wherein the spirally-rolled electrodes for batteries are sealed having a concentric circle shape or an elliptic shape with a positive electrode and a negative electrode which are wound spirally interposing a separator therebetween has the structure as below:

(1) the said positive electrode and/or negative electrode comprise with the combinations of plural electrode plates;

(2) each of the said combinations in the said positive electrode and/or the said negative electrode so comprises that the total amount of the active material or pseudo-active material which are the main materials is substantially constant and;

(3) each electrode plate in the electrode is wound in series with an interval therebetween.

9. A secondary battery as set forth in claim 8, wherein the thickness at the bottom of the said battery case (t₂) is thick enough for welding and the ratio (t_2/t₁) of the thickness at the bottom (t₂) to the thickness at the side wall (t₁) is not less than 1.5.

10. A secondary battery as set forth in claim 9, wherein thicker part is provided inside the battery case at the border of the side wall and the bottom of the said battery case.

11. A secondary battery as set forth in claim 9, wherein the adjacent positive terminal of the secondary battery is welded directly or indirectly by a metallic connector to the bottom of the neighboring battery case.