Spirally-rolled electrodes with separator and the batteries therewith

• US 7,087,345 B2
• Filed: 05/25/2001
• Issued: 08/08/2006
• Est. Priority Date: 10/26/2000
• Status: Expired due to Term

• Current Assignee: Japan Capacitor Industrial Co., Ltd.
• Original Assignee: Isao Matsumoto
• Inventors: Matsumoto, Isao
• Primary Examiner(s): Ruthkosky, Mark
• Application Number:
  US09/866,180
• Publication Number:
  US 20020076606A1
• Time in Patent Office: 1,901 Days
• Field of Search: 429/94, 429/164, 429/223
• 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 comprising 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) said thin nickel positive electrode is the electrode around which plural positive electrode plates are wound in series in order;

(2) 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.

2. Spirally-rolled electrodes for batteries as set forth in claim 1, wherein each of the several electrode plates comprising said positive electrode and said negative electrode has at least two chamfered corners.

3. Spirally-rolled electrodes for batteries as set forth in claim 1, wherein the interval among the plural electrode plates comprising said positive electrode and/or negative electrode is within the range of 1.0–

5.0 mm.

4. Spirally-rolled electrodes for batteries as set forth in claim 1, wherein each of the several electrodes themselves has substantially the same area.