WO2023020740A1 - Dispositif de découpe et procédé de production de nappes d'électrodes à partir d'une feuille d'électrode - Google Patents

Dispositif de découpe et procédé de production de nappes d'électrodes à partir d'une feuille d'électrode Download PDF

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Publication number
WO2023020740A1
WO2023020740A1 PCT/EP2022/068280 EP2022068280W WO2023020740A1 WO 2023020740 A1 WO2023020740 A1 WO 2023020740A1 EP 2022068280 W EP2022068280 W EP 2022068280W WO 2023020740 A1 WO2023020740 A1 WO 2023020740A1
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WO
WIPO (PCT)
Prior art keywords
roller
cutting
electrode foil
electrode
cutting device
Prior art date
Application number
PCT/EP2022/068280
Other languages
German (de)
English (en)
Inventor
Kartik Jamadar
Sebastian DERSCH
Sven Schopf
Henrike Schünemann
Original Assignee
Volkswagen Aktiengesellschaft
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 Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Publication of WO2023020740A1 publication Critical patent/WO2023020740A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2614—Means for mounting the cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D11/00—Combinations of several similar cutting apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/20—Cutting beds
    • B26D7/204—Anvil rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/40—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member
    • B26D1/405—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D2210/00—Machines or methods used for cutting special materials

Definitions

  • the invention relates to a cutting device and a method for producing electrode sheets from an electrode foil.
  • the electrode sheets are used in particular in a battery cell, preferably a secondary battery cell.
  • Batteries in particular lithium-ion batteries, are increasingly being used to drive motor vehicles. Batteries are usually assembled from cells, each cell having a stack of electrode sheets, namely anode, cathode and separator sheets. At least some of the anode and cathode sheets are designed as current collectors to divert the current provided by the cell to a consumer arranged outside the cell.
  • a carrier material in particular a strip-shaped carrier material, e.g. B. a carrier film, preferably coated on both sides with at least one active material.
  • the carrier film forms a current collector for the battery cell.
  • the coated carrier material forms an electrode foil.
  • the electrode foil is an endless material that can be divided into electrode sheets by cutting processes. These electrode sheets can be used in battery cells.
  • collector tabs which as uncoated components of the carrier foil protrude laterally from the coated part of the electrode sheet
  • electrode separation also referred to as "separation”; i.e. the production of electrode sheets from the electrode foil
  • These operations are carried out either mechanically or by laser. Due to the separate machines for slotting and notching or separating, a higher investment and floor space is required.
  • Laser notching is an energy-intensive process (approx. 6 kW power requirement of the system) and creates a heat-affected zone.
  • the laser process is inefficient because most of the concentrated light rays are reflected off the copper surface of the electrode foil.
  • a special green laser is needed to achieve better light adsorption by copper. This type of laser is expensive and does not allow speeds higher than 80 m/min.
  • the movement of the electrode foil in the z-direction (thickness direction of the electrode foil, transverse to the conveying direction) during the slitting process causes waves at the slit edge. It is not possible to control this ripple as there is no counter tool.
  • the movement of the electrode foil in the y-direction is not restricted. This leads to a ripple in the y-direction.
  • Burr formation occurs due to the lack of a counterforce when slotting and mechanically notching.
  • Both slotting and notching are the largest sources of particles in the electrode manufacturing process. Both operations require the installation of web face, edge and tool cleaning equipment, resulting in double costs.
  • a device for cutting an electrode foil is known from EP 2 648 264 B1.
  • the device includes a knife that cuts through the electrode foil as a result of a movement directed transversely to the surface of the electrode foil.
  • a cutting device for electrode foils is known from JP 3619618 B2 and KR 101211804 B1. In this case, an endless material of an electrode foil is guided through two rollers which have circular cutting edges. The circular blades cooperate to make a line of cut so that the electrode foil can be divided into narrower ribbons.
  • a cutting device for electrode foils is known from KR 2006-0080092 A.
  • the electrode foil is guided through a pair of rollers, one of which is cylindrical and serves as a support surface for the electrode foil.
  • the other roll has a cutting contour and spacers. The distance between the rollers is fixed via the spacers.
  • the cutting contour generates cutting lines on the electrode foil that run lengthwise and crosswise to the conveying direction. The cutting contour does not contact the support surface of the opposite roll.
  • the object of the present invention is to at least partially solve the problems cited with reference to the prior art.
  • a cutting device and a method for producing electrode sheets from an electrode foil are to be proposed, by means of which a high effectiveness of the production process can be achieved at the same time as low costs and high product quality.
  • a cutting device for producing electrode sheets from an electrode foil comprises at least one first roller with a first axis of rotation and at least one second roller arranged opposite the first roller with a second axis of rotation parallel to the first axis of rotation.
  • the first roller has a continuously cylindrical first support surface for contacting an electrode foil that can be guided through a first gap between the rollers.
  • the at least one second roller has a cutting contour through which at least one cutting line runs into the first gap when the rollers are rotating Electrode foil can be introduced.
  • the second roller has a second support surface surrounding the cutting contour for contacting the electrode foil that can be guided through the first gap, the second support surface being elastically deformable at least with respect to a radial direction running transversely to the second axis of rotation.
  • the cutting device serves in particular to process a coated electrode foil.
  • the coating comprises at least one active material for storing ions, in particular lithium ions.
  • the coating on the electrode foil can be carried out on one side or on both sides.
  • the coating has a thickness of at least 5 ⁇ m [microns], in particular between 5 ⁇ m and 40 ⁇ m, preferably between 8 ⁇ m and 25 ⁇ m, particularly preferably at most 40 ⁇ m or even at most 25 ⁇ m.
  • the electrode foil is fed to the cutting device in particular as an endless material.
  • the electrode foil is guided through the cutting device along a conveying direction.
  • the conveying direction runs, in particular, transversely to the axes of rotation of the rollers and through the first gap between the rollers.
  • a plurality of electrode sheets are produced from the endless material with the cutting device.
  • An electrode sheet produced with the cutting device has, in particular, a geometry that is intended and suitably designed for use in a battery cell.
  • the coating is arranged particularly continuously along the conveying direction, preferably on both sides, on the carrier material of the electrode foil. Uncoated areas can be provided on the sides of the electrode foil, which is designed as an endless material, optionally also continuously along the conveying direction. These uncoated areas can form the conductor lugs of the electrode sheets.
  • a width of the first gap is designed in particular in such a way that it is greater than the extension of the electrode foil.
  • the height of the first gap is matched to the electrode foil.
  • the cutting contour is always arranged at a distance from the first support surface.
  • the second roller with the cutting contour is arranged relative to the first roller that the cutting contour never comes into contact with the (non-elastically deformable) first support surface of the first roller during operation of the cutting device, ie when the rollers are rotating.
  • the cutting contour extends so far through the first gap and towards the first roller that at least the carrier material of the electrode foil is completely severed.
  • the cutting contour has a minimum distance from the first support surface of at least 5 ⁇ m, in particular at least 10 ⁇ m, preferably at most 40 ⁇ m, particularly preferably at most 25 ⁇ m or even at most 15 ⁇ m.
  • the second roller has a second support surface surrounding the cutting contour.
  • This second support surface is elastically deformable along the radial direction.
  • the non-deformed second support surface extends along the radial direction in particular so far outwards that the deformation of the second support surface takes place through the electrode foil arranged in the first gap. In the area of the first gap, the second support surface is displaced towards the second axis of rotation by the electrode foil.
  • the second support surface is in particular undeformed.
  • the cutting device extends in the radial direction beyond the second support surface and can thus produce the at least one cutting line in the electrode foil.
  • the undeformed second support surface extends in the radial direction at least as far as the cutting contour or even beyond the cutting contour.
  • the first support surface is elastically deformable at least in relation to the radial direction.
  • the first support surface can be made of an elastically deformable material of the same type as the second support surface or of a different elastically deformable material.
  • the undeformed first support surface extends along the radial direction in particular so far outwards that the first support surface is deformed by the electrode foil arranged in the first gap. In the area of the first gap, the first support surface is displaced by the electrode foil towards the first axis of rotation.
  • an elastically deformable support surface allows a coating of the electrode foil to remain undamaged during the cutting processes outside of the cutting lines.
  • a compressive force acting on the electrode foil from the rollers can be adjusted as precisely as possible via the elastically deformable support surface, with tolerances, e.g. B. the electrode foil or the thickness of the coating, can be easily compensated.
  • a conveying force acting on the electrode foil in the conveying direction can be uniformly transmitted via at least one driven roller.
  • the cutting device in the case of an elastically deformable first support surface, can be designed in such a way that the electrode foil is completely severed by the cutting contour.
  • the cutting contour then extends through the electrode foil and penetrates into the elastically deformable material of the first support surface.
  • the cutting contour is in particular not arranged at a distance from the first support surface.
  • the cutting depth or the projection of the cutting contour from the second support surface be set out.
  • the cutting device comprises at least a plurality of second rollers, with each second roller having a cutting contour that differs from one another and through which a different cutting line can be made in the electrode foil.
  • the second rollers are arranged at a distance from one another along a conveying direction of the electrode foil and thus in a circumferential direction and form the respective first gap with the one first roller.
  • the electrode foil is in particular guided at least partially around the first roller.
  • the electrode foil therefore contacts the first roller not only in the area of a single first gap, but also at least in the area of a second first gap, possibly also over an angular area of the first support surface of the first roller that extends between the at least two first gaps.
  • a cutting contour-free third roller with a third axis of rotation parallel to the second axis of rotation is arranged at least between two second rollers, preferably between each two second rollers.
  • the third roller has a third support surface Contacting an electrode foil that can be guided through a second gap between the third roller and the first roller.
  • the at least one third roller serves to press the electrode foil against the first roller and to generate tension in the section of the electrode foil that is (immediately) in front of the second gap or the third roller along the conveying direction.
  • first roller and a second roller are arranged one behind the other along the conveying direction, predetermined cutting lines being introduced into the electrode foil by each pair.
  • a first group of cutting lines can e.g. B. exclusively a slitting (also referred to as "slitting"; cutting line runs parallel to the conveying direction and extends in particular continuously; several electrode foils with a reduced width are produced from the electrode foil).
  • a second group of cutting line can e.g. B. exclusively a notching (also referred to as "notching", i.e. the production of conductor lugs, which protrude laterally from the coated part of the electrode sheet as uncoated components of the carrier film).
  • These cutting lines can run at least partially transversely to the conveying direction and at least partially parallel to the conveying direction.
  • the conductor lugs produced in this way are arranged at a distance from one another along the conveying direction on the electrode foil (present as endless material).
  • the areas of the electrode foil that are present along the conveying direction between the conductor lugs and are in particular uncoated are separated and removed as a result of these cutting lines (and in particular are not used as an electrode sheet).
  • a third group of cutting lines can e.g. B. exclusively an electrode detachment or a separation (also referred to as “separation”; i.e. the production of electrode sheets from the electrode foil).
  • These cutting lines run in particular (at least partially) transversely to the conveying direction or parallel to the axes of rotation, with individual electrode sheets being produced from the endless material of the electrode film as a result of the cutting lines.
  • the cutting contour produces at least one cutting line running parallel to the axes of rotation (the first axis of rotation, the at least one second axis of rotation, possibly a third axis of rotation) by means of which the electrode foil can be divided into separate electrode sheets.
  • slitting along the conveying direction always takes place in front of another pair of rollers, which has a cutting contour for notching and/or separating.
  • notching and/or slitting along the conveying direction always takes place in front of another pair of rollers, which has a cutting contour for separating.
  • each pair of rollers or a second roller is assigned to only one group of cutting lines.
  • each pair of rollers or a second roller is assigned to exactly two groups of cutting lines.
  • Preferably only one pair of rollers is provided, through which all groups of cutting lines and in particular also all cutting lines required for the production of the electrode sheets are produced.
  • the electrode sheets have a geometry intended for arrangement in battery cells.
  • the cutting contour is inseparable from the second roller, that is to say one piece with the second roller.
  • the cutting contour is designed to be separable from the second roller. A wear-dependent change in the cutting contour can thus take place in a simple manner.
  • the cutting contour can be fixed on the second roller at least by a magnetic force.
  • a material forming at least one of the support surfaces has such a texture that when the material is elastically deformed, a force directed away from the respective cutting line acts on the electrode foil from the material.
  • the texture can e.g. B. be designed spirally, so extend spirally around the axis of rotation of the respective role.
  • the elastic deformability of the material forming the support surface makes it possible in particular for the areas of the electrode foil separated by the cutting line to also be displaced as a result of the displacement of the elastically deformed material, so that the cutting effect of the cutting contour is supported. With a texture of the material, this effect can be intensified.
  • the elastically deformable material comprises in particular a polymer, preferably polyurethane.
  • the material can be designed as a coating on the respective roll.
  • the roller is in particular made of steel, in particular chromium-coated.
  • the cutting contour comprises a generally known hard metal material, preferably tungsten carbide.
  • the cutting device can be arranged in particular in a device for calendering.
  • the coated carrier material is guided through an arrangement of rollers, which are optionally temperature-controlled and can therefore heat the coated carrier material.
  • the coating is compacted by the rollers. There is usually an increase in the density of the coating of at least 20%.
  • the at least one first roller can be designed as a calendering roller.
  • the cutting device is preferably provided for processing completely coated and completely compacted electrode foils.
  • the cutting device represents the last method step for processing the electrode foil, through which the individual electrode sheets are then provided.
  • the cutting device can also be combined with known cutting devices.
  • a waviness in the area close to the cutting lines can be reduced or even prevented by a transverse tensile stress induced by the elastically deformable material of the support surfaces. Burr formation at the cut lines can be reduced or prevented by inducing a compressive stress on the electrode foil by the rollers.
  • the cutting device can be easily combined with a lamination to produce monocells in which an anode or a cathode is directly laminated with a separator material. Instead of the manufactured electrode sheets being stacked and collected in a magazine, each individual electrode sheet can be transported directly to the laminating process for the application of the separator material.
  • the cutting device can also be integrated into the calendering, whereby the calendering roll can serve as the first roll.
  • the cutting device comprises at least one first roller with a first axis of rotation and at least one second roller arranged opposite the first roller with a second axis of rotation parallel to the first axis of rotation.
  • the first roller has a continuously cylindrical first support surface for contacting an electrode foil that can be guided through a first gap between the rollers.
  • the at least one second roller has a cutting contour, through which at least one cutting line can be made in the electrode foil that is guided through the first gap when the rollers are rotating.
  • the second roller has a second support surface surrounding the cutting contour for contacting the electrode foil that can be guided through the first gap.
  • Either the second support surface is elastically deformable at least with respect to a radial direction running transversely to the second axis of rotation, or an elastically deformable support film is guided through the first gap together with the electrode film.
  • the method comprises at least the following steps: a) providing the cutting device; b) providing at least the electrode foil or additionally the supporting foil; c) Conveying at least the electrode foil or additionally the supporting foil through the rotating rollers of the cutting device along a conveying direction and thereby introducing the cutting lines into the electrode foil by at least one cutting contour, the cutting contour at least one cutting line running parallel to the axes of rotation produced, through which the electrode foil can be divided into separate electrode sheets, so that the plurality of electrode sheets is produced.
  • the cutting device includes
  • the supporting film serves exclusively to prevent the cutting contour from coming into contact with the first supporting surface, which in particular is not elastically deformable. In this way, the supporting film can only be used between the first roll and the second roll. If necessary, the electrode foil can then be conveyed on alone.
  • the cutting device thus corresponds to the cutting device described, with the elastically deformable second support surface not necessarily having to be implemented in the proposed method or in the cutting device used therein. Their function can be fulfilled by the elastically deformable support film.
  • the supporting film is arranged in particular between the electrode film and the first roller, so that the at least one cutting contour can extend through the electrode film and into the supporting film.
  • the cutting device in the case of an elastically deformable support foil, can be designed in such a way that the electrode foil is completely severed by the cutting contour.
  • the cutting contour then extends through the electrode foil and penetrates into the elastically deformable material of the supporting foil.
  • the cutting contour is always arranged at a distance from the first support surface.
  • the cutting depth or the projection of the cutting contour out of the electrode foil and into the supporting foil can be adjusted by adjusting a pressure force between the first roller and the second roller or by selecting the elastically deformable material of the supporting foil.
  • a battery cell is also proposed, at least comprising a housing and arranged therein at least one electrode sheet, which is produced by the method described.
  • the battery cell comprises in particular a housing enclosing a volume and arranged in the volume at least one first electrode sheet of a first type of electrode, a second electrode sheet of a second type of electrode and a separator material arranged in between and an electrolyte.
  • the battery cell is in particular a pouch cell (with a deformable housing consisting of a pouch film) or a prismatic cell (with a dimensionally stable housing).
  • a pouch film is a well-known deformable housing part that is used as a housing for so-called pouch cells. It is a composite material, e.g. B. comprising a plastic and aluminum.
  • the battery cell is in particular a lithium-ion battery cell.
  • the individual sheets of the plurality of electrode sheets are arranged one on top of the other and in particular form a stack.
  • the electrode sheets are each assigned to different types of electrodes, ie they are designed as an anode or a cathode. In this case, anodes and cathodes are arranged alternately and are each separated from one another by the separator material.
  • a battery cell is an electricity storage device that B. is used in a motor vehicle for storing electrical energy.
  • a motor vehicle has an electric machine for driving the motor vehicle (a traction drive), wherein the electric machine can be driven by the electrical energy stored in the battery cell.
  • a motor vehicle at least comprising a traction drive and a battery with at least one of the battery cells described, wherein the traction drive can be supplied with energy by the at least one battery cell.
  • the method can be carried out in particular by a control unit that is equipped, configured or programmed to carry out the method described. At least you can with the control unit
  • a rotational speed of at least one driven roller can be regulated.
  • the method can also be carried out by a computer or with a processor of a control unit.
  • a system for data processing which includes a processor which is adapted/configured in such a way that it carries out the method or part of the steps of the proposed method.
  • a computer-readable storage medium can be provided which comprises instructions which, when executed by a computer/processor, cause the latter to carry out the method or at least part of the steps of the proposed method.
  • the statements on the cutting device can be transferred in particular to the method, the battery cell, the motor vehicle, the control unit and the computer-implemented method (i.e. the computer or the processor, the data processing system, the computer-readable storage medium) and vice versa.
  • the computer-implemented method i.e. the computer or the processor, the data processing system, the computer-readable storage medium
  • indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral.
  • indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral.
  • Correspondingly introduced terms or components are to be understood in such a way that they are present at least once and in particular can also be present several times.
  • first”, “second”, ...) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and/or sequence of these objects, sizes or make processes mandatory for each other. Should a dependency and/or order be necessary, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment. If a component can occur several times (“at least one”), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.
  • FIG. 3 the cutting device according to FIG. 2 in a view along a conveying direction
  • FIG. 4 shows a section of FIG. 3
  • FIG. 9 the cutting device according to FIG. 8 in a view along a conveying direction
  • Fig. 10 a section of Fig. 9.
  • Fig. 1 shows a method for producing electrodes sheets 2 from an electrode foil 3.
  • the electrode foil 3 is present as a coated endless material.
  • the coating 20 comprises at least one active material for storing ions, in particular lithium ions.
  • the coating 20 is arranged continuously along the conveying direction 14 on the carrier material 25 of the electrode foil 3 .
  • uncoated areas are provided continuously along the conveying direction 14 . These uncoated areas form the collector lugs 21 of the electrode sheets 2 .
  • the cutting lines 11 of a first group 22 and a second group 23 are indicated.
  • a first group 22 of cutting lines 11 is assigned exclusively to slitting (also referred to as “slitting”; cutting line 11 runs parallel to the conveying direction 14 and extends continuously; a plurality of electrode foils 3 with a reduced width are produced from the electrode foil 3).
  • a second group 23 of cutting line 11 is assigned exclusively to notching (also referred to as “notching”; i.e. the production of output tabs 21 which, as uncoated components of the electrode foil 3, protrude laterally from the coated part of the electrode foil 3).
  • These cutting lines 11 run partially transversely to the conveying direction 14 and partially parallel to the conveying direction 14 .
  • the uncoated areas of the electrode foil 3 present between the conductor tabs 21 along the conveying direction 14 are separated and removed as a result of these cutting lines 11 and are not used as the electrode sheet 2 .
  • a third group 24 of cutting lines 11 is assigned exclusively to an electrode detachment or a separation (also referred to as “separation”; ie the production of electrode sheets 2 from the electrode foil 3). These cutting lines 11 run exclusively transversely to the conveying direction 14, as a result of the cutting lines 11 being produced from the continuous material of the electrode foil 3, individual electrode sheets 2 are produced.
  • FIG. 2 shows a first embodiment of a cutting device 1 in a side view.
  • FIG. 3 shows the cutting device 1 according to FIG. 2 in a view along a conveying direction 14.
  • FIG. 4 shows a section of FIG. 3.
  • FIGS. 2 to 4 are described together below. Reference is made to the statements relating to FIG.
  • the cutting device 1 comprises a first roller 4 with a first axis of rotation 5 and a second roller 6 arranged opposite the first roller 4 with a second axis of rotation 7 parallel to the first axis of rotation 5.
  • the first roller 4 has a continuously cylindrical first support surface 8 for contacting an electrode foil 3 guided through a first gap 9 between the rollers 4, 6.
  • the second roller 6 has a cutting contour 10 through which cutting lines 11 can be introduced into the electrode foil 3 guided through the first gap 9 when the rollers 4, 6 are rotating.
  • the cutting contour 10 is always arranged at a distance from the first support surface 8 .
  • the second roller 6 has a cutting contour 10 surrounding the second support surface 12 for contacting through the first Gap 9 guidable electrode film 3, wherein the second support surface 12 is elastically deformable at least with respect to a transverse to the second axis of rotation 7 radial direction 13.
  • the electrode foil 3 is fed to the cutting device 1 as an endless material.
  • the electrode foil 3 is guided through the cutting device 1 along a conveying direction 14 .
  • the conveying direction 14 runs transversely to the axes of rotation 5, 7 of the rollers 4, 6 and through the first gap 9 between the rollers 4, 6.
  • the electrode foil 3 is kept under tension in the conveying direction 14 in front of the cutting device 1 (see arrow on the left of the cutting device 1 in FIG. 2).
  • the cutting contour 10 includes all cutting lines 11 of the first group 22, the second group 23 and the third group 24, so that in the conveying direction 14 after the cutting device 1 there are separated electrode sheets 2 which are transported away on a conveying device 26.
  • the second roller 6 is arranged with the cutting contour 10 relative to the first roller 4 such that the cutting contour 10 never contacts the first support surface 8 of the first roller 4 during operation of the cutting device 1, i.e. when the rollers 4, 6 are rotating. In this case, however, the cutting contour 10 extends so far through the first gap 8 and towards the first roller 4 that at least the carrier material 25 of the electrode foil 3 is completely severed.
  • the second roller 6 has a second support surface 12 surrounding the cutting contour 10 .
  • This second support surface 12 is elastically deformable along the radial direction 13 .
  • the non-deformed second support surface 12 extends outwards along the radial direction 13 so far that the deformation of the second support surface 12 takes place through the electrode foil 3 arranged in the first gap 9 .
  • the second support surface 12 is displaced in the area of the first gap 9 by the electrode foil 3 towards the second axis of rotation 7 .
  • the cutting device 1 extends in the radial direction 13 beyond the second support surface 12 and can thus produce the cutting lines 11 in the electrode foil 3 .
  • the non-deformed second support surface 12 extends in the radial direction 13 beyond the cutting contour 10 .
  • FIG. 5 shows a second embodiment variant of a cutting device 1 in a side view. Reference is made to the statements relating to FIGS.
  • the first support surface 8 of the first roller 4 is also elastically deformable here, at least with respect to the radial direction 13 .
  • the undeformed first support surface 8 extends outwards along the radial direction 13 so far that the first support surface 8 is deformed by the electrode foil 3 arranged in the first gap 9 .
  • the first support surface 8 is displaced in the area of the first gap 9 by the electrode foil 3 towards the first axis of rotation 5 .
  • FIG. 6 shows a third embodiment variant of a cutting device 1 in a side view. Reference is made to the statements relating to FIGS.
  • the cutting device 1 comprises two pairs of a first roller 4 and a second roller 6, which are arranged one behind the other along the conveying direction 14, predetermined cutting lines 11 being introduced into the electrode foil 3 by each pair.
  • a pair of rollers consisting of a first roller 4 and a second roller 6, is used to slit, i.e. to introduce cutting lines 11 of the first group 22, along the conveying direction 14 in front of another pair of rollers, which have a cutting contour 10 for notching and separating, i.e for introducing cutting lines of the second group 23 and the third group 24 has.
  • FIG. 7 shows a fourth embodiment variant of a cutting device 1 in a side view. Reference is made to the statements relating to FIG.
  • the cutting device 1 comprises two second rollers 6, with each second roller 6 having a cutting contour 10 that differs from one another, through which a different cutting line 11 can be introduced into the electrode film 3 in each case.
  • the second rollers 6 are arranged at a distance from one another along a conveying direction 14 of the electrode foil 3 and thus in a circumferential direction 15 and form the respective first gap 9 with the one first roller 4 .
  • the electrode foil 3 is guided at least partially around the first roller 4 .
  • the electrode foil 3 therefore contacts the first roller 4 not only in the area of a single first gap 9, but also at least in the area of a second first gap 9, and also over an angular area of the first support surface 8 of the first roller 4, which extends between the two first columns 9 extends.
  • a third roller 16 Arranged between the two second rollers 6 is a third roller 16 which is free of cutting contours and has a third axis of rotation 17 which is parallel to the axes of rotation 5 , 7 .
  • the third roller 16 has a third support surface 18 for contacting an electrode foil 3 guided through a second gap 19 between the third roller 16 and the first roller 4 .
  • the third roller 16 serves to press the electrode foil 3 against the first roller 4 and to generate tension in the section of the electrode foil 3 that is located directly in front of the second gap 19 or the third roller 16 along the conveying direction 14 .
  • FIG. 8 shows a fifth embodiment variant of a cutting device 1 in a side view.
  • FIG. 9 shows the cutting device 1 according to FIG. 8 in a view along a conveying direction 14.
  • FIG. 10 shows a section of FIG. 9.
  • FIGS. 8 to 10 are described together below. Reference is made to the statements relating to FIGS.
  • the cutting device 1 used here does not have an elastically deformable second support surface 12 , but an elastically deformable support film 27 is guided through the first gap 9 together with the electrode film 3 .
  • the function of the deformable second support surfaces 12 is fulfilled by the elastically deformable support film 27 in the fifth embodiment variant or in the method described.
  • the support film 27 serves to prevent the cutting contour 10 from coming into contact with the non-elastically deformable first support surface 8.
  • the support film 27 is only to be used between the first roller 4 and the second roller 6, so that the electrode film 3 can then be conveyed on alone.
  • the supporting foil 27 is arranged between the electrode foil 3 and the first roller 4 so that the at least one cutting contour 10 extends through the electrode foil 3 and into the supporting foil 27 .
  • the cutting device 1 is designed in such a way that the electrode film 3 is completely severed by the cutting contour 10 .
  • the cutting contour 10 then extends through the electrode foil 3 and penetrates into the elastically deformable material of the supporting foil 27 .
  • the cutting contour 10 is always arranged at a distance from the first support surface 8 .
  • the cutting depth or the projection of the cutting contour 10 out of the electrode foil 3 and into the supporting foil 27 can be adjusted by adjusting a pressure force between the first roller 4 and the second roller 6 or by selecting the elastically deformable material of the supporting foil 27 .

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention concerne un dispositif (1) de découpe destiné à produire des nappes (2) d'électrodes à partir d'une feuille (3) d'électrode, comportant au moins un premier rouleau (4) doté d'un premier axe (5) de rotation et au moins un second rouleau (6), disposé en face du premier rouleau (4), doté d'un second axe (7) de rotation qui est parallèle au premier axe (5) de rotation; le premier rouleau (4) présentant une première surface (8) d'appui continûment cylindrique destinée à entrer en contact avec une feuille (3) d'électrode qui peut être guidée à travers un premier écartement (9) entre les rouleaux (4, 6); le ou les seconds rouleaux (6) présentant un contour (10) de découpe au moyen duquel au moins une ligne (11) de découpe peut être introduite dans la feuille (3) d'électrode guidée à travers le premier écartement (9) lorsque les rouleaux (4, 6) tournent; le second rouleau (6) présentant une seconde surface (12) d'appui, entourant le contour (10) de découpe, destinée à entrer en contact avec la feuille (3) d'électrode qui peut être guidée à travers le premier écartement (9). L'invention concerne également un procédé de production de nappes (2) d'électrodes à partir d'une feuille (3) d'électrode.
PCT/EP2022/068280 2021-08-17 2022-07-01 Dispositif de découpe et procédé de production de nappes d'électrodes à partir d'une feuille d'électrode WO2023020740A1 (fr)

Applications Claiming Priority (2)

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DE102021209025.7A DE102021209025A1 (de) 2021-08-17 2021-08-17 Schneidvorrichtung und Verfahren zur Herstellung von Elektrodenblättern aus einer Elektrodenfolie
DE102021209025.7 2021-08-17

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JPS619618B2 (fr) 1978-11-14 1986-03-25 Minolta Camera Kk
US4640165A (en) * 1985-04-11 1987-02-03 Baldwin Technology Corporation Rotary knife system
JP2001093515A (ja) * 1999-09-28 2001-04-06 Honda Motor Co Ltd 電極板の製造方法およびその装置
WO2006024470A1 (fr) * 2004-08-28 2006-03-09 Umicore Ag & Co. Kg Procede de production d'unites membrane-electrodes
KR20060080092A (ko) 2005-01-04 2006-07-07 엘지전자 주식회사 전극 제조용 커팅장치
DE102005038612A1 (de) * 2005-08-16 2007-02-22 Basf Ag Verfahren zur Herstellung von beidseitig katalysatorbeschichteten Membranen
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EP2648264B1 (fr) 2010-12-02 2019-10-02 LG Chem, Ltd. Nouveau dispositif de coupe d'une feuille d'électrode et accumulateur fabriqué au moyen de ce dispositif
WO2013037591A1 (fr) * 2011-09-15 2013-03-21 Siemens Aktiengesellschaft Procédé de production à sec d'une unité membrane-électrodes, unité membrane-électrodes et ensemble de laminage
WO2016130659A1 (fr) * 2015-02-12 2016-08-18 Dicar, Inc. Manchon cylindrique rotatif pouvant être fixé
JP2017132019A (ja) * 2016-01-29 2017-08-03 株式会社豊田自動織機 電極製造装置
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