Flat-folded, multi-plate electrode assembly

• US 5,776,628 A
• Filed: 06/30/1997
• Issued: 07/07/1998
• Est. Priority Date: 06/30/1997
• Status: Expired due to Term

• Current Assignee: Greatbatch Limited (Greatbatch Incorporated)
• Original Assignee: Wilson Greatbatch Technologies, Inc.
• Inventors: Kraft, Glenn, Czamara, Deborah
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US08/885,085
• Time in Patent Office: 372 Days
• Field of Search: 429/94, 429/161, 429/160, 429/162, 429/127, 429/217, 429/218, 429/211
• US Class Current: 429/94
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/045 Cells or batteries with folded plate-like electrodes
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/545 formed by the casing of the cells cup shaped terminals adapted for cells having curved cross-section H01M50/56
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence
• 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
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

A multi-plate wound cell assembly constructed similar to a conventional jellyroll electrode assembly except that each electrode comprises a series of plates spaced along a continuous current collector, and the plates are flat-folded rather than wound into a cylinder, is described. The length of the current collector between adjacent plates of the anode and cathode electrodes increases as the folding progresses to allow for the increase as the electrode assembly is flat-folded.

Claims

1. A battery, which comprises:

a) an anode comprising an anode current collector having a plurality of anode connector portions bridging between adjacent anode contact portions of the anode current collector provided with an anode active material contacted thereto to thereby provide anode plates connected by the anode connector portions, wherein the anode connector portions are of an increasingly greater length from a first anode plate progressing to a last anode plate;

b) a cathode electrode comprising a cathode current collector having a plurality of cathode connector portions bridging between adjacent cathode contact portions of the cathode current collector provided with a cathode active material contacted thereto to thereby provide cathode plates connected by the cathode connector portions, wherein the cathode connector portions are of an increasingly greater length from a first cathode plate progressing to a last cathode plate;

c) a separator disposed between the anode electrode and the cathode electrode juxtaposed one on top of the other to provide a flat foldable anode and cathode electrode overlay with a first plate of one of the anode electrode and the cathode electrode folded on top of a second plate of the other of the anode electrode and the cathode electrode such that a first connector portion of the one folded cathode plate or anode plate is of a length greater than the thickness of the other of the anode electrode or the cathode electrode to thereby provide a first folded electrode configuration and wherein the first folded electrode configuration is foldable on top of the next anode and cathode electrode overlay with the connector portions of the anode electrode and the cathode electrode intermediate the first folded electrode configuration and the next anode and cathode electrode overlay having lengths sufficient to provide for the combined thickness of the subsequent folded electrode configuration consisting of the first folded electrode configuration and the next anode electrode and cathode electrode overlay and wherein the respective successive connector portions connecting between the subsequent folded electrode configuration and the successive anode plates and the successive cathode plates of the electrode overlay are of a progressively greater length to accommodate the ever increasing thickness of the following folded electrode configuration foldable to the last anode plate and the last cathode plate of the electrode overlay; and

d) an electrolyte activating and operatively associating the anode electrode and the cathode electrode.

2. The battery of claim 1 wherein the first plate of the one of the anode electrode and the cathode electrode folded on top of a second plate of the other of the anode electrode and the cathode electrode is an anode plate.

3. The battery of claim 1 wherein the anode electrode consists of one more anode plate than the cathode electrode consists of cathode plates.

4. The battery of claim 1 wherein the anode electrode is a unitary member.

5. The battery of claim 1 wherein the cathode electrode is a unitary member.

6. The battery of claim 1 wherein the cathode active material is selected from the group of a carbonaceous material, a fluorinated carbon, a metal, a metal oxide, a metal sulfide and a mixed metal oxide, and mixtures thereof.

7. The battery of claim 1 wherein the cathode electrode further comprises at least one of a binder material and a conductive additive.

8. The battery of claim 7 wherein the binder material is a fluoro-resin power.

9. The battery of claim 7 wherein the conductive additive is selected from the group consisting of carbon, graphite powder, acetylene black and metallic powder selected from the group consisting of titanium, aluminum, nickel and stainless steel, and mixtures thereof.

10. The battery of claim 1 wherein the anode electrode is comprised of a Group IA metal.

11. The battery of claim 1 wherein the electrolyte activating the anode electrode and the cathode electrode comprises an ion-forming alkali metal salt dissolved in a nonaqueous solvent, and wherein the alkali metal of the salt is the same as the alkali metal comprising the anode electrode.

12. The battery of claim 1 housed inside of a casing selected from the group consisting of titanium, stainless steel, milled steel, nickel-plated milled steel and aluminum, and mixtures thereof.