# US 5,525,441 A · Folded electrode configuration for galvanic cells

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- Number: US 5,525,441 A
- Document ID: US5525441A
- Status: Granted
- Kind: A
- Application number: 08/305,439
- Filed: 1994-09-13
- Granted: 1996-06-11
- Earliest claimed: 1994-09-13
- Assignees: Power Conversion, Inc.
- Inventors: Thomas B. Reddy; Pedro Rodriguez
- Web page: https://patentgrep.com/patent/US5525441A

## 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

An electrochemical cell stack comprising:
A) a strip of cathode material having sufficient flexibility to permit folding over of the strip onto itself;
B) a strip of anode material having flexibility sufficient to permit the strip to be folded over onto itself and comprising a lithium foil constructed and arranged with a metal current collector extending along the length of said foil; and
C) non-conductive porous separator means positioned between said cathode strip and anode strip to prevent electrical contact between said two strips and being in contact with an electrolyte, said strips being of sufficient length to permit the formation of a plurality of cells when the strips are folded over onto themselves, said anode and cathode cell stack being folded so that the anodes and cathodes are folded at right angles to each other.

### Claim 2 (depends on 1)

The cell stack 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 cell stack of claim 2 wherein said nonconductive flexible separator material is a porous polymeric material.

### Claim 4 (depends on 3)

The cell stack of claim 3 wherein said nonconductive flexible separator material is in the form of an envelope.

### Claim 5 (depends on 1)

The cell stack of claim 1 wherein said lithium anode is a laminate comprising in order a first lithium foil layer, a copper current collector strip and a second lithium foil layer.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The cell stack of claim 1 wherein the electrolyte is a liquid electrolyte.

### Claim 9

An electrochemical cell stack comprising:
A) a plurality of individual cathodes connected together through flexible current collector means;
B) a plurality lithiumfoil anodes connected together through flexible means including a metal current collector; and
C) non-conductive flexible members between said plurality of cathodes and said plurality of anodes, said cell stack assembly having said plurality of cathodes and plurality of anodes folded one on top of the other at right angles.