# US 5,618,318 A · Method for forming a folded electrode configuration for galvanic cells

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- Number: US 5,618,318 A
- Document ID: US5618318A
- Status: Granted
- Kind: A
- Application number: 08/614,199
- Filed: 1996-03-12
- Granted: 1997-04-08
- Earliest claimed: 1994-09-13
- Assignees: Power Conversion, Inc.
- Inventors: Thomas B. Reddy; Pedro Rodriquez
- Web page: https://patentgrep.com/patent/US5618318A

## CPC

- H01M 10/052: Li-accumulators
- H01G 11/12: Stacked hybrid or EDL capacitors
- H01G 11/52: Separators
- H01G 11/56: Solid electrolytes, e.g. gels; Additives therein
- H01G 11/58: Liquid electrolytes
- H01G 11/82: Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
- H01M 6/10: with wound or folded electrodes
- H01M 6/16: with organic electrolyte (H01M6/18 takes precedence)
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/045: {Cells or batteries with folded plate-like electrodes}
- H01M 10/05: Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence)
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/38: Construction or manufacture
- H01M 2300/0025: Organic electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02E 60/13: Energy storage using capacitors
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/49108: Electric battery cell making
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A high density cell stack is provided utilizing strips of flexible cathode material and flexible anode materials folded over each other at right angles. A suitable anode material is lithium and a suitable cathode material is manganese dioxide. The disclosed cell stacks are rapidly manufactured to provide high density cells with good mechanical stability and good stability against shorting.

## Claims

### Claim 1

The method of fabricating a electrochemical cell stack comprising:
A) providing a strip of cathode material having flexibility sufficient to permit folding over of said strip onto itself;
B) providing a strip of flexible anode material having flexibility sufficient to permit folding over of said onto itself and comprising a lithium foil constructed and arranged with a metal current collector extending along the length of said foil;
C) providing a flexible, non-conductive separator material between said anode and cathode strips of A and B to prevent electrical contact between said strip and being in contact with an electrolyte; and
D) folding said anode and cathode strips at right angles to provide a cell stack having at least 3 layers of said anodes and cathodes folded over onto each other at right angles.

### Claim 2 (depends on 1)

The method of claim 1 wherein there are at least 3 folds to provide 3 layers of anodes and 4 layers of cathodes.

### Claim 3 (depends on 2)

The method of claim 2 wherein said non-conductive flexible separator material is a porous polymeric material.

### Claim 4 (depends on 3)

The method of claim 3 wherein said non-conductive flexible separator material is in the form of an envelope.

### Claim 5 (depends on 1)

The method of claim 1 wherein said metal current collector is a copper current collector strip inlaid into the surface of said lithium foil.

### Claim 6 (depends on 5)

The method of claim 5 wherein said cathode comprises manganese dioxide as the active material.

### Claim 7 (depends on 1)

The method of claim 1 wherein the electrolyte is a solid polymer.

### Claim 8 (depends on 1)

The method of claim 1 wherein the electrolyte is a liquid electrolyte.