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WO2000024067A1 - Separateur de batterie, et procede de fabrication correspondant - Google Patents

Separateur de batterie, et procede de fabrication correspondant Download PDF

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Publication number
WO2000024067A1
WO2000024067A1 PCT/US1998/022484 US9822484W WO0024067A1 WO 2000024067 A1 WO2000024067 A1 WO 2000024067A1 US 9822484 W US9822484 W US 9822484W WO 0024067 A1 WO0024067 A1 WO 0024067A1
Authority
WO
WIPO (PCT)
Prior art keywords
ribs
backweb
battery separator
submini
major
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.)
Ceased
Application number
PCT/US1998/022484
Other languages
English (en)
Inventor
James Young
Francis E. Alexander
Daniel E. Weerts
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.)
Amtek Research International LLC
Original Assignee
Amtek Research International LLC
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
Priority claimed from US08/954,411 external-priority patent/US6132899A/en
Application filed by Amtek Research International LLC filed Critical Amtek Research International LLC
Priority to AU11970/99A priority Critical patent/AU1197099A/en
Priority to PCT/US1998/022484 priority patent/WO2000024067A1/fr
Publication of WO2000024067A1 publication Critical patent/WO2000024067A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • H01M50/406—Moulding; Embossing; Cutting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/417—Polyolefins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/491—Porosity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/06—Lead-acid accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/44—Fibrous material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This invention relates to a battery separator for use in flooded cell type lead acid batteries and to a method for making such separators .
  • the positive and negative electrodes or “plates” are separated by a battery separator.
  • the battery separator typically has "ribs" or protrusions extending from at least one planar face of the separator.
  • Such ribs are formed in one of several ways : the ribs can be formed integrally with the backweb of the separator; the ribs can be subsequently applied to the backweb as a bead of the same or different material as the backweb; or the ribs can be formed by embossing the backweb.
  • the ribs function to provide proper spacing between the plates and to provide a space wherein free electrolyte resides.
  • the battery separator currently used by most flooded cell type lead acid battery manufacturers is of the microporous polyethylene type.
  • This type of separator has a composition consisting essentially of an ultra high molecular weight polyethylene, a filler (typically amorphous silica) , a plasticizer (typically a processing oil) , and certain minor ingredients such as an antioxidant, lubricant and carbon black.
  • Microporous polyethylene separator material is commercially manufactured by passing the ingredients through a heated extruder, passing the extrudate generated by the extruder through a die and into the nip formed by two heated calender rolls to form a continuous web, extracting a substantial amount of the processing oil from the web by use of a solvent, drying the extracted web, slitting the web into lanes of predetermined width, and winding the lanes into rolls.
  • Such separators and a method of manufacturing them are described in U.S. Patent No. 3,351,495.
  • Microporous polyethylene separators typically have a configuration comprising a backweb having a predetermined thickness, and a plurality of parallel ribs spaced apart a predetermined distance and extending outwardly from one planar surface of the backweb.
  • the ribs extend continuously in a longitudinal direction parallel to the edges of the separator material .
  • the thickness of the backweb and height and spacing of the ribs is specified to the separator manufacturer by the battery manufacturer; the specifications are designed to maximize certain battery characteristics desired by the battery manufacturer.
  • mini-ribs between such "major” ribs to add stiffness to separator webs having thinner backwebs .
  • Such mini-ribs have a lower height than the major ribs and are spaced closer together.
  • the height of such mini-ribs typically varies between about 0.006 inch and about 0.009 inch.
  • the spacing of such mini-ribs varies between about 0.060 inch and about 0.250 inch.
  • Such ribs are formed during manufacture of the microporous polyethylene separator by providing that one of the two heated calender rolls forming the nip through which the extrudate from the extruder is fed is engraved with grooves so that the ribs are formed as an integral part of the separator web.
  • integrally formed ribs in the polyethylene type separator undergoes extraction along with the backweb and, because it has relatively more volume than a portion of the backweb occupying the same planar surface area, generally the ribs retain more processing oil than the backweb, thereby raising the overall electrical resistance of the separator.
  • a battery separator having a longitudinal dimension, a width dimension perpendicular to said longitudinal dimension, upper and lower planar faces, and a plurality of ribs (at least three) projecting from at least one planar face, said ribs extending in a direction substantially parallel to the longitudinal dimension of the separator, each of the ribs being formed of a plurality of individual projecting embossments forming a corrugated structure comprised of alternating ridges and furrows.
  • the ribs may extend from one or both planar faces of the separator.
  • the ribs extend from both planar faces, adjacent projecting embossments (ridges) on one planar face are separated by an indentation (furrow) which forms a projecting embossment (ridge) on the other planar face of the separator.
  • the ribs projecting from one planar surface may have a height equal to or different from the height of the ribs extending from the other planar surface.
  • the improved battery separator of the 08/837,286 patent application employs an embossable base web comprised of a backweb having a plurality of submini-ribs extending from at least one planar face thereof, the base web being embossed with a plurality of major ribs, each major rib extending into at least one, and preferably at least two, adjacent submini- ribs .
  • This invention relates to a battery separator having a longitudinal dimension, a width dimension perpendicular to said longitudinal dimension, upper and lower planar faces, a plurality of submini-ribs extending from at least one of said planar faces, a lesser plurality of stop-ribs extending from the other planar face, and a plurality of individual projecting embossments forming plurality of major ribs, each of said major ribs being a corrugated structure comprised of alternating ridges and furrows, each of which major ribs extending into at least one of the submini-ribs and some, but not all, of the major ribs extending into some of the stopribs .
  • FIG. 1 is a partial perspective view of the upper planar surface of the separator material of this invention.
  • FIG. 2 is a partial perspective view of the lower planar surface of the separator material of this invention.
  • FIG. 3 is an enlarged partial bottom plan view of a single rib of this invention.
  • FIG. 4 is an enlarged partial edge view in cross-section of a portion of the separator of this invention taken along line 4-4 of FIG. 1.
  • FIG. 5 is a frontal view of two embossing rolls employing plurality of embossing wheels.
  • FIG. 6 is a side view of two adjacent embossing wheels .
  • FIGS. 7 through 10 are partial top plan views of the upper planar surface of the separator illustrating several alternative configurations for the rib configuration.
  • FIG. 11 is a perspective view of an embossing tooth having a rounded wedge shape .
  • FIG. 12 is a perspective view of an embossing tooth having a conical shape.
  • FIG. 13 is a perspective view of an embossing tooth having a hemispherical shape.
  • FIG. 14 is a perspective view of an embossing tooth having the shape of a truncated cone.
  • FIG. 1 is a partial perspective top view of the separator 10 of this invention.
  • Separator 10 has parallel, longitudinal edges 11a and lib, and upper and lower planar surfaces 12 and 13, respectively.
  • the major ribs 14 Projecting from the upper planar surface 12 of separator 10 are a plurality of major ribs 14a through 14j .
  • the major ribs 14 are disposed in the longitudinal direction of the separator 10, substantially parallel to longitudinal edges 11a and lib thereof.
  • submini-ribs 15 are also projecting from the upper planar surface 12 of separator 10. These ribs are called “sub-mini ribs” because they are generally shorter and spaced closer together than prior art mini-ribs. Submini-ribs 15 are also disposed in the longitudinal direction of the separator 10, substantiall parallel to longitudinal edges 11a and lib thereof. In the preferred embodiment, submini-ribs 15 are formed integral with backweb 20.
  • Major ribs 14 are formed by embossing separato 10 in the area of one or more submini-ribs 15.
  • the majo ribs 14 illustrated in FIG. 1 do not show the presence o submini-ribs 15 therein for the sake of clarifying the drawing.
  • the relationship of the submini-ribs 15 and major ribs 14 is best shown in FIG. 4.
  • FIG. 2 illustrates the lower planar surface 13 of separator 10.
  • a plurality of stop-ribs 16 extend fro lower planar surface 13 and, in the preferred embodiment are formed integral with backweb 20.
  • Stop-ribs 16 are disposed in the longitudinal direction of separator 10, substantially parallel to longitudinal edges 11a and li thereof.
  • the spacing between adjacent stop-ribs 16 is greater than the spacing between adjacent major ribs 14. In the embodiment illustrated in FIG. IB, the spacing i such that only fifty percent of the major ribs 14 overlays a stop-rib 16.
  • the spacing may, however, be such that between about 30 percent and about 70 percent of the major ribs 14 overlays a stop-rib 16.
  • FIG. 3 is an enlarged, partial bottom view of a major rib 14.
  • Major rib 14 is shown as having been embossed in an area encompassing a single stop-rib 16. The spacing of the stop-ribs 16 may be selected so that between about 30 percent and about 70 percent of the major ribs 14 overlay and are embossed into a stop-rib 16.
  • FIG. 4 is a cross-sectional view through separator 10.
  • a plurality of submini- ribs 15 extend from upper planar surface 12 of backweb 20 and a plurality of stop-ribs 16a, 16b, and 16c extend from the lower planar surface 13 of backweb 20.
  • Major ribs 14e and 14f are embossed into the backweb 20.
  • Major rib 14e is embossed into two submini-ribs 15o and 15p and into a single stop-rib 16a.
  • Major rib 14f is embossed into two submini-ribs 15x and 15y but not into any stop-rib 16.
  • the length dimension of the ridges 22 and 24, i.e., the length of the ridges 22 and 24 from one side wall 26 to the other side wall 28 of major rib 14, is selected in accordance with the desired width of the rib. This dimension will generally be between about 0.020 and about 0.100 inch.
  • the frequency of the ridges i.e., the number of ridges per unit of rib length, will preferably be between about 5 and about 25 ridges per inch.
  • the height of the ridges 22 and 24 above the respective planar surfaces 12 and 13 of the backweb 20 is selected in accordance with the desired height of the major ribs 14. This dimension will generally be between about 0.01 to about 0.10 inch.
  • the submini-ribs 15 are particularly useful in providing improved compression resistance when the desired height of major ribs 14 is greater than about 0.030 inch.
  • the distance between adjacent major ribs 14 will generally be between about 0.25 to about 1.0 inch.
  • the height of the submini-ribs 15 above the upper planar surface of the separator will generally be between about 0.003 inch and about 0.009 inch. Selection of an appropriate height for the submini-ribs 15 will depend upon the height of the major ribs 14 and the desired compression resistance.
  • the width of the submini-ribs 15 may vary between about 0.010 inch and about 0.020 inch.
  • the submini-ribs 15 will generally be evenly spaced, between about 0.025 inch and about 0.050 inch, across the width of the separator.
  • the height of the stop-ribs above the backweb can be between about 0.005 inch and 0.015 inch, preferably about 0.010 inch.
  • the top width of the stop-ribs can be between about 0.010 inch and about 0.020 inch, preferably between about 0.015 inch and about 0.017 inch.
  • the stop-rib has a cross section in the shape of a trapezoid with the widest part located at its intersection with the backweb. The angle of the sides is about 7 degrees from the vertical.
  • the stop-ribs are spaced apart a distance of between about 0.100 inch and about 0.200 inch, preferably about 0.150 inch.
  • the spacing distance is selected to provide that between about 30 percent and about 70 percent of the major ribs overlies and is embossed into a stop-rib.
  • the width of the separator of this invention can be any width used by battery manufacturers; generall this width will range between about 2 to about 12 inches with side edges 16 and 18 being parallel to each other.
  • the thickness of backweb 20 of the separator 10 will typically range between about 0.002 to about 0.025 inch.
  • FIGS. 1-3 The cross-section of the corrugated structure forming the rib of this invention is illustrated in FIGS. 1-3 as being triangular, with each individual embossed projection thus being wedge shaped.
  • Each wedge shaped embossment is comprised of a sloping leading wall 17, a sloping trailing wall 19 and vertical side walls 26 and 28, as best seen in FIG. 3.
  • other similar wedge shapes may be used, including but not limited to a rounded wedge shape where the ridge is slightly rounded instead of angular, or a flattened wedge shape where the ridge is either formed flat during embossing or the ridge flattened by subsequent pressing.
  • the separator provides a substantially barrier free environment for flow of electrolyte and any gases released during charging and discharging since the ribs contact the plates only in the ridge area.
  • Prior art ribs being solid, are in contact with the positive plate in the entire upper surface area of the rib which imposes a barrier to electrolyte and/or gas flow.
  • a further advantage obtained in using the separator of the present invention is in reducing or eliminating rib bending and/or flattening.
  • the number of alternating enveloped (with separator material) and unenveloped plates required to form a cell are stacked together, compressed and inserted into a cell compartment of a battery case.
  • the compressive forces to which the separators are subjected can cause undesirable rib bending and/or flattening with conventional rib construction, especially at higher "overall" dimensions, i.e., rib heights.
  • the rib configuration of the present invention reduces or eliminates such rib bending and/or flattening.
  • submini-ribs 15 to provide higher major rib height without loss of compression resistance also allows separators to be made with thinner backwebs which means a savings in the amount of material required to make a specified square footage of separator product.
  • submini-ribbed separator product Another advantage to the submini-ribbed separator product is that longer production runs between tooling changes can be made compared to manufacturing separator product with major ribs being formed on the production line. Also, solvent extraction and drying of submini-ribbed product is easier and faster than product having major ribs formed thereon during manufacture.
  • the separator of the invention is illustrated as having major ribs 14 extending from both planar surfaces 12 and 13 of the backweb 20, the invention is intended to include a separator where the major ribs are formed on only one side.
  • the height of the ribs 14 above planar surfaces 12 and 13, respectively, of backweb 20 may be the same or the height of the ribs on one side may be greater or lesser than the height of the ribs on the other side.
  • submini-ribs 15 extend from only one planar surface of the backweb 20 with the stop-ribs 16 extending from the opposite planar surface.
  • the submini-ribs and the stop-ribs may extend from both planar faces of the backweb.
  • FIGS. 5 and 6 illustrate an apparatus suitable for making the separators of this invention.
  • FIG. 5 is a front view of two embossing rolls 30 and 32 having a plurality of embossing wheels 31a-31g and 33a-33g, respectively, located thereon.
  • Each of embossing wheels 31a-31g on embossing roll 30 are aligned with embossing wheels 33a-33g, respectively, on embossing roll 32.
  • Each of the embossing wheels 31 and 33 are, essentially, specially shaped gear wheels with a plurality of gear teeth 32 and 33, respectively, projecting therefrom, as best seen in FIG. 6.
  • embossing wheels is intended to include both separate gear wheels located on an embossing roll or axle (such as by press fitting) or an embossing roll having multiple rows of teeth machined therein.
  • Embossing rolls 30 and/or 32 are rotated by suitable drive means, not shown. It is preferred to have only one of embossing rolls 30 or 32 driven by external drive means with the other roll being rotated by the driven embossing roll .
  • the gear teeth 32 and 34 of aligned embossing wheels 31 and 33 intermesh and emboss major ribs 14 and 15 into flat separator material 20 when it is passed through the nip between rotating embossing rolls 30 and 32 in the direction indicated by the arrow in FIG. 6. Where the height of the ribs extending from both planar faces are the same, the teeth 32 and 34 are equal in height.
  • the height of gear teeth 32 and 34 are, correspondingly, different in height.
  • one of embossing wheels 31 or 33 may be a "male" roll having gear teeth as illustrated with the other embossing wheel being a
  • male roll having grooves therein with dimensions corresponding to the dimensions of the gear teeth extending from the male roll .
  • first embossing roll a male with gear teeth of varying height and as the second embossing roll a smooth roll formed of rubber or other deformable material .
  • gear teeth 32 and 33 are shown as having sharp apexes to form sharp ridges in the product illustrated in FIGS. 1-3. However, it is preferred to round the apexes of teeth 32 and 33 and other sharp edges of the teeth in order to minimize stress cracking of the separator substrate. Such a rounded tooth 132 is shown in FIG. 11.
  • FIG. 12 shows a gear tooth 232 having a conical shape.
  • FIG. 13 shows a gear tooth 332 having a hemispherical shape.
  • FIG. 14 shows a gear tooth 432 having the shape of a truncated cone .
  • the formation of the ribs of the present invention involves plastic deformation of the backweb material at the location where the embossing takes place. Plastic deformation indicates that the material was loaded beyond its yield point which, by definition, means that it has experienced plastic flow. It has been shown that oxidation resistance is improved in the area of plastic deformation due to oil being driven to the surface upon collapse of micropores .
  • thermoplastic polymers include polymers and copolymers of ethylene, propylene, butylene, vinyl chloride and styrene.
  • Suitable thermoset compositions include phenolics, ethylene/propylene/diene, isoprene, butadiene, styrene and similar thermosetting polymers.
  • the ribs have been illustrated in the preferred embodiment disclosed herein as having ridges and furrows that are perpendicularly aligned with the longitudinal dimension of the separator.
  • the alignment of the ridges and furrows may be such as to form an angle to the longitudinal dimension of the separator, such angle being less than 180 degrees, and preferably less than about 160 degrees, to the longitudinal dimension, but greater than 0 degrees and preferably greater than about 20 degrees.
  • the alignment of the ridges and furrows of some ribs to the longitudinal dimension of the separator may vary from the alignment of the ridges and furrows of other ribs .
  • FIGS. 7-10 Examples of such alternative configurations are illustrated in FIGS. 7-10.
  • FIG. 7 illustrates a separator 100 in which the major ribs 114 have embossments in adjacent major ribs 114a, 114b and 114c whose ridges 122 and 124, and corresponding furrows, are alternatingly angled with respect to each other.
  • FIG. 8 illustrates a separator 200 in which the ridges of major rib 214 form a chevron pattern made up of ridge elements 222 and 224.
  • FIG. 9 illustrates a separator 300 in which the ridges of major rib 314 form a tractor tread pattern made up of ridge elements 322 and 324.
  • FIG. 10 illustrates a separator 400 in which the ridges of major rib 414 form a continuous sinusoidal (zig-zag) pattern made up of ridge elements 422 and 424.
  • the continuous sinusoidal pattern of the ridges could be rounded ("IS" shaped) instead of sharp as illustrated in FIG. 10.
  • a primary advantage of the present invention is that it allows battery separator manufacturers to continuously produce a uniform sheet of microporous material without interrupting the manufacturing process to change engraved calender rolls. Such sheet material would then be supplied to the battery manufacturer in rolls of appropriate width and the battery manufacturer would apply the major ribs in accordance with this invention. It is contemplated that such ribs would be applied just prior to the plate enveloping operation.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Separators (AREA)

Abstract

L'invention concerne un séparateur (10) de batterie destiné à être utilisé dans les batteries au plomb à accumulateurs immergés, lequel séparateur comprend un élément (20) de support constitué d'un matériau poreux, résistant à l'électrolyte et gaufrable, pourvu d'une pluralité de nervures (14a) principales et de nervures (15, 16) secondaires dépassant d'une surface plane (12) au moins de l'élément de support ainsi que d'une pluralité, moins importante, de nervures (16) d'arrêt dépassant de l'autre surface plane (13). Chaque nervure principale (14a) se présente sous la forme d'une structure ondulée gaufrée comprenant une alternance de crêtes et de sillons. Les nervures principales (14) sont formées sur un élément (20) de support du séparateur de batterie comportant une pluralité de nervures (15) secondaires dépassant d'une surface plane (12) de l'élément et une autre pluralité, moins importante de nervures (16) d'arrêt dépassant de l'autre surface plane (13) de l'élément, par une opération consistant à faire passer l'élément (20) de support dans la ligne de pincement d'une paire de rouleaux (30, 32) de gaufrage opposés, et à gaufrer l'élément (20) de support considéré au niveau de la zone correspondant à une nervure (15) secondaire au moins et au niveau de la zone correspondant à certaines nervures (16) d'arrêt.
PCT/US1998/022484 1997-10-20 1998-10-21 Separateur de batterie, et procede de fabrication correspondant Ceased WO2000024067A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU11970/99A AU1197099A (en) 1997-10-20 1998-10-21 Battery separator and method of making
PCT/US1998/022484 WO2000024067A1 (fr) 1997-10-20 1998-10-21 Separateur de batterie, et procede de fabrication correspondant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/954,411 US6132899A (en) 1997-10-20 1997-10-20 Battery Separator having different size ribs and method of making the same
PCT/US1998/022484 WO2000024067A1 (fr) 1997-10-20 1998-10-21 Separateur de batterie, et procede de fabrication correspondant

Publications (1)

Publication Number Publication Date
WO2000024067A1 true WO2000024067A1 (fr) 2000-04-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1514319A4 (fr) * 2002-05-31 2008-11-05 Daramic Inc Separateur d'accumulateur a nervures crenelees
US9461291B2 (en) 2011-11-21 2016-10-04 Daramic, Llc Embossed separators, batteries and methods

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369236A (en) * 1981-03-04 1983-01-18 W. R. Grace & Co. Battery separator
US4403024A (en) * 1982-01-11 1983-09-06 W. R. Grace & Co. Battery separator
US4927722A (en) * 1988-09-09 1990-05-22 Grace G.M.B.H. Separator for starter batteries
US5679479A (en) * 1996-05-08 1997-10-21 Amtek Research International Llc Battery separator
US5789103A (en) * 1997-04-11 1998-08-04 Amtek Research International Llc Battery separator and method of making

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369236A (en) * 1981-03-04 1983-01-18 W. R. Grace & Co. Battery separator
US4403024A (en) * 1982-01-11 1983-09-06 W. R. Grace & Co. Battery separator
US4927722A (en) * 1988-09-09 1990-05-22 Grace G.M.B.H. Separator for starter batteries
US5679479A (en) * 1996-05-08 1997-10-21 Amtek Research International Llc Battery separator
US5789103A (en) * 1997-04-11 1998-08-04 Amtek Research International Llc Battery separator and method of making

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1514319A4 (fr) * 2002-05-31 2008-11-05 Daramic Inc Separateur d'accumulateur a nervures crenelees
US9461291B2 (en) 2011-11-21 2016-10-04 Daramic, Llc Embossed separators, batteries and methods

Also Published As

Publication number Publication date
AU1197099A (en) 2000-05-08

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