EP0487682A1 - Pile - Google Patents

Pile

Info

Publication number
EP0487682A1
EP0487682A1 EP19910911387 EP91911387A EP0487682A1 EP 0487682 A1 EP0487682 A1 EP 0487682A1 EP 19910911387 EP19910911387 EP 19910911387 EP 91911387 A EP91911387 A EP 91911387A EP 0487682 A1 EP0487682 A1 EP 0487682A1
Authority
EP
European Patent Office
Prior art keywords
battery
foraminous
electrolyte material
laminate
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910911387
Other languages
German (de)
English (en)
Inventor
Paul Radmall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dowty Electronic Components Ltd
Original Assignee
Dowty Electronic Components Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dowty Electronic Components Ltd filed Critical Dowty Electronic Components Ltd
Publication of EP0487682A1 publication Critical patent/EP0487682A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/14—Cells with non-aqueous electrolyte
    • H01M6/18—Cells with non-aqueous electrolyte with solid electrolyte
    • H01M6/181—Cells with non-aqueous electrolyte with solid electrolyte with polymeric electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/04—Cells with aqueous electrolyte
    • H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
    • H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes

Definitions

  • This invention relates to a solid state battery, and in particular, a solid state battery of folded construction.
  • the present invention is concerned with providing a solid state battery of folded construction in which this problem is eliminated, or at least drastically reduced.
  • the present invention comprises a solid state battery of at least one electrochemical cell comprising a positive electrode, a negative electrode and a solid electrolyte material which are assembled as a laminate which is then folded back on itself, characterised in that a layer of an electrically non-conducting foraminous material is incorporated within the solid electrolyte material in the region of the fold in the laminate.
  • the foraminous member should be made from a non- electrically conducting material.
  • the non-electrically conducting material may, or may not, have the ability to allow ionic conduction thereacross.
  • non-electrically conducting material should be a material which will not itself deteriorate the actual electrochemical operation of the cell. For example, it should not react or contain latent contaminants (such as water) which will react with the materials of the major components of the battery and so effect the operation of the cells of the battery.
  • the foraminous member prevents the negative and positive electrodes from electrically contacting one another, and ensures that electrolyte material (which is enclosed within the holes of the foraminous member) is present allowing normal electrochemical operation of the cell in this area.
  • the foraminous member is embedded in the electrolyte material so that it does not add to the overall width/thickness of .the major component assembly of the battery.
  • individual foraminous members are provided in respect of each individual fold of the concertina, and each of the individual foraminous members comprises a strip which extends over the full transverse of the negative electrode, positive electrode and electrolyte material.
  • the foraminous member is provided with a series of perforations.
  • the negative electrode of the battery of the present invention is formed from lithium metal or a lithium alloy and the foraminous member is formed from polypropylene.
  • the non-electrically conducting material of the foraminous member is a material substantially free of latent water, namely polypropylene.
  • polypropylene in addition to being non electrically conducting does not exhibit any ionic conductivity of its own right.
  • the actual ionic conductivity of the battery in this area across the foraminous member is brought about by the electrolyte material caught and held within the holes, for example, the holes or perforations of the foraminous member.
  • Figure 1 shows a schematic side view of an electrochemical cell of a battery made in accordance with the present invention
  • FIG. 2 shows a schematic plan view of the electrochemical cell shown in Figure 1 of the drawings;
  • Figure 3 shows a schematic section across the width of a folded section of the core member of Figures 1 and 2.
  • a battery made in accordance with the present invention comprises electrochemical cells as shown in Figure 1 of the drawings, which electrochemical cells include a core member 1.
  • the core member 1 comprises a layered structure having three layers as follows: a first layer 2 which comprises a positive active material held within a polymeric structure and constitutes the positive electrode of the electro ⁇ chemical cell; .
  • a second layer 3 of polymeric solid state electrolyte material for example Polyethylene Oxide containing Propylene Carbonate and Ethylene Carbonate and having a lithium salt dispersed therein;
  • the core member 1 of the battery is assembled within a casing (not shown) and in order to economically achieve this (in a spatial sense) the core member 1 can be formed into a concertina which has a known preset separation between the position of the folds which enable formation of the concertina. In order to form the concertina the core member is folded back and forth across itself so that in a side profile the core member 1 has a zig zag pattern.
  • the core member 1 is provided with a series of foraminous members 5 having a number of perforations 6 formed thereon.
  • the foraminous members 5 in this example are manufactured from polypropylene which in itself, and any latent compounds of the electrochemical cells.
  • the foraminous members 5 are manufactured from polypropylene sheeting whose thickness is less than the thickness of the second layer 3 of electrolyte material of the battery with which it is to be associated. In this way the foraminous member 5 can easily be embedded in the second layer 3 of electrolyte material of the battery without adding any thickness to the core member of the battery.
  • the series of foraminous members 5 are spaced from one another in the second layer 3 of electrolyte material, at the same spacing as the battery will be folded to form the concertina.
  • the electrolyte material When the core member 5 is folded, in the vicinity of the fold the electrolyte material is squeezed as a result of the bunching in the innermost ' layer and the stretching of the outermost layer. Now as the electrolyte material is of a physical consistency which is more likely to flow than that of the surrounding layers it is forced away from the affected area.
  • the foraminous members 5 were not present the positive electrode and negative electrodes of the electrochemical cell(s) would eventually contact one another and short the electrochemical cell(s). This obviously drastically affects the operation of the battery. ow in the present invention some of the electrolyte material in the second layer 3 of the core member 1 may be squeezed away from the vicinity of the fold. However, the foraminous member 5 in the vicinity of the fold prevents the positive electrode and negative electrode from contacting one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Primary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

Une pile à semi-conducteurs composée d'au moins une pile électrochimique comprend une électrode positive (2), une électrode négative (4) et un matériau électrolytique solide (3) qui sont assemblés sous forme de laminé, lequel est alors replié sur lui-même, une couche d'un matériau foraminé non-électroconducteur (5) étant incorporé dans le matériau électrolytique solide (3) dans la région de pliure du laminé. Le matériau foraminé (5) peut se composer de polypropylène et peut être perforé. Un matériau foraminé (5) peut etre ménagé dans la région de chacun d'une multiplicité de plis.
EP19910911387 1990-06-20 1991-06-20 Pile Withdrawn EP0487682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9013754 1990-06-20
GB9013754A GB2245411A (en) 1990-06-20 1990-06-20 Folded solid state battery.

Publications (1)

Publication Number Publication Date
EP0487682A1 true EP0487682A1 (fr) 1992-06-03

Family

ID=10677922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910911387 Withdrawn EP0487682A1 (fr) 1990-06-20 1991-06-20 Pile

Country Status (4)

Country Link
EP (1) EP0487682A1 (fr)
JP (1) JPH05500880A (fr)
GB (1) GB2245411A (fr)
WO (1) WO1991020105A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5300373A (en) * 1992-09-11 1994-04-05 Valence Technology, Inc. Electrochemical cell stack and method of making an electrochemical cell stack
JP3397351B2 (ja) * 1992-12-18 2003-04-14 キヤノン株式会社 角型あるいはシート型電池及びその製造方法
EP0651455B1 (fr) * 1993-10-07 1997-07-30 Matsushita Electric Industrial Co., Ltd. Méthode de fabrication d'un séparateur pour un générateur au lithium d'électrolyte organique et un générateur au lithium d'électrolyte organique utilisant un tel séparateur
US7063918B2 (en) 2000-10-23 2006-06-20 The University Of Maryland, College Park Nanoscale solid-state polymeric battery system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB621239A (en) * 1947-02-10 1949-04-06 Chloride Electrical Storage Co Improvements relating to electric accumulators
NL295064A (fr) * 1962-09-24
US3239380A (en) * 1963-10-02 1966-03-08 Yardney International Corp Electrode assembly for battery cells
FR1391849A (fr) * 1964-01-18 1965-03-12 Accumulateurs Fixes Procédé de fabrication de piles ou accumulateurs à électrodes en forme de bandes ou de chapelets et produits en résultant
DE3067151D1 (en) * 1979-09-12 1984-04-26 Lucas Ind Plc Battery systems employing bipolar electrodes
US4761352A (en) * 1985-05-17 1988-08-02 Eastman Kodak Company Accordian folded electrode assembly
JPS63152884A (ja) * 1986-12-16 1988-06-25 Shin Kobe Electric Mach Co Ltd アルカリ蓄電池の製造法
FR2616970B1 (fr) * 1987-06-18 1995-05-19 Elf Aquitaine Ensemble multi-couches pour la realisation de l'assemblage d'un generateur, procede d'elaboration de cet ensemble et de realisation du generateur complet, et generateur ainsi realise
DE3829541A1 (de) * 1987-09-03 1989-03-16 Ricoh Kk Blattfoermige elektrode, verfahren zur herstellung derselben und diese enthaltende sekundaerbatterie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9120105A1 *

Also Published As

Publication number Publication date
GB9013754D0 (en) 1990-08-08
WO1991020105A1 (fr) 1991-12-26
GB2245411A (en) 1992-01-02
JPH05500880A (ja) 1993-02-18

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19920218

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19930705