Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
  • B65H29/38—Delivering or advancing articles from machines; Advancing articles to or into piles by movable piling or advancing arms, frames, plates, or like members with which the articles are maintained in face contact
  • B65H29/40—Members rotated about an axis perpendicular to direction of article movement, e.g. star-wheels formed by S-shaped members
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/44—Moving, forwarding, guiding material
  • B65H2301/447—Moving, forwarding, guiding material transferring material between transport devices
  • B65H2301/4474—Pair of cooperating moving elements as rollers, belts forming nip into which material is transported
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2404/00—Parts for transporting or guiding the handled material
  • B65H2404/10—Rollers
  • B65H2404/11—Details of cross-section or profile
  • B65H2404/111—Details of cross-section or profile shape
  • B65H2404/1113—C-shape
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2404/00—Parts for transporting or guiding the handled material
  • B65H2404/60—Other elements in face contact with handled material
  • B65H2404/65—Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel
  • B65H2404/655—Means for holding material on element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2404/00—Parts for transporting or guiding the handled material
  • B65H2404/60—Other elements in face contact with handled material
  • B65H2404/65—Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel
  • B65H2404/656—Means for disengaging material from element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/10—Handled articles or webs
  • B65H2701/19—Specific article or web
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2801/00—Application field
  • B65H2801/72—Fuel cell manufacture
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/04—Processes of manufacture in general
• • 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
• • 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
  • Y02E60/30—Hydrogen technology
  • Y02E60/50—Fuel cells

Definitions

• the invention relates to an electrode stack wheel which is designed to receive and transport flat electrode elements.
• the electrode stack wheel has an axis of rotation, which is designed to rotate the electrode stack wheel.
• the electrode stack wheel has a plurality of stack fingers formed radially to the axis of rotation, which are arranged circumferentially around the axis of rotation.
• the electrode stack wheel has a plurality of spaces which are each formed between the stack fingers, with a respective space being formed to receive an electrode element.
• the invention also relates to a corresponding electrode stack device and method for producing an electrode stack.
• Electrode elements for the production of electrochemical energy stores such as lithium-ion batteries, or energy converters, such as fuel cells, are usually stacked. Electrode elements are stacked in particular in the production of pouch cells, a widespread type of lithium-ion battery.
• the electrode elements are usually designed as a cathode, based, for example, on aluminum foil, and/or an anode, based, for example, on copper foil.
• the smallest unit of every lithium-ion cell consists of two electrodes and at least one separator that separates the electrodes from one another. Later, after filling, the ion-conductive electrolyte is located in between.
• the electrode elements are stacked in a repeating cycle of anode, separator, cathode, separator, and so on.
• the stacking step in production often represents the bottleneck for production throughput. Accelerating stacking is therefore of great interest.
• WO 2020/212316 A1 describes a method for producing an electrode stack of anodes and cathodes for a lithium-ion battery of an electrically powered motor vehicle, in which the anodes and cathodes are conveyed into receptacles of a rotationally driven or rotationally drivable stacking wheel , and the anodes and cathodes received in the receptacles are conveyed to a stacking compartment by means of a rotation of the stacking wheel.
• An important step in stacking the electrode elements using a stacking wheel is the accuracy of the transport of the electrode elements through the stacking wheel.
• the accuracy of the transport has a direct effect on the stacking accuracy. Put simply, the more precise the transport with the stacking wheel, the more precisely the electrode stack can be produced.
• the object of the invention is to create an electrode stacking wheel, an electrode stacking device and a method for producing an electrode stack with which or with which or with which an electrode element can be stacked more precisely.
• This object is achieved according to the invention by an electrode stacking wheel, an electrode stacking device and a method having the features according to the respective independent claims.
• Advantageous embodiments of the invention are the subject matter of the dependent claims.
• An electrode stacking wheel according to the invention is designed to accommodate and transport flat electrode elements.
• the electrode stack wheel includes the following:
• each gap being designed to receive at least one of the electrode elements or to be able to receive.
• the electrode stack wheel comprises an electrode clamping element which is formed in each of the intermediate spaces.
• the electrode clamping element is designed to apply a clamping force to a main surface of one of the electrode elements in the clamping state and to press the respective electrode element against the respective stacking finger by the application of force.
• the invention is based on the finding that the accuracy of the transport can be increased by the electrode elements being transported by the electrode stacking wheel in a clamped state. This can prevent the electrode elements from moving within the electrode stack wheel and, as a result, from being placed imprecisely on the electrode stack.
• the respective electrode clamping element can have two different states.
• a clamping condition which exists when an electrode element is placed in the space and the electrode clamping element exerts the clamping force on the electrode element.
• a clamp-free state which is present when the Gap is free, so no electrode element is arranged in it.
• the electrode clamping element can be formed without tension or relaxed.
• the electrode stack wheel has a plurality of stack fingers.
• a gap is preferably formed in each case between the stacking fingers.
• At least one of the electrode clamping elements is preferably formed in the respective intermediate space.
• the stacking fingers are preferably each elongate. Furthermore, the stacking fingers each preferably taper with increasing distance from the axis of rotation.
• the electrode clamping element is preferably elongate and/or finger-shaped.
• the electrode clamping element is designed to taper flat at the free end, ie the end remote from the contact point with the stacking finger.
• the electrode clamping element is preferably designed to be bendable under the action of force, at least in the area of the contact point; in particular, the electrode clamping element moves back into the starting position when the force is removed. As a result, the electrode clamping element can be pushed out of the electrode element, but then exerts the clamping force on the electrode element since it wants to return to its original position.
• the electrode stacking wheel, the stacking fingers and in particular the electrode clamping elements are preferably formed in one piece.
• the main surface of the electrode element is designed in particular as a surface with a larger surface area than the side surfaces.
• the main surface is the one Surface which is formed in the clamped state in the direction of the stacking fingers, ie in particular no end surface or side surface which is formed many times narrower than the main surface.
• the intermediate spaces are each preferably designed to be open in the axial direction.
• the stacking fingers have a curvature.
• the curvature is formed counter to the running direction of the electrode stack wheel.
• the stacking fingers and/or the intermediate spaces can also be designed without curvature, in particular for accommodating less flexible or rigid electrode elements.
• the position in the electrode stack wheel can then be radial or secantial.
• a plurality of electrode elements are conveyed with the electrode stack wheel in order to produce the electrode stack.
• the electrode elements can be constructed as cathodes and/or anodes.
• the cathode and anode are conveyed alternately.
• a separator or a separating layer is arranged between the electrode elements, in particular between the cathode and the anode.
• the electrode elements can also be in the form of a prefabricated cell which includes a cathode, an anode and preferably also at least one separating layer.
• the electrode element can already be designed as a cell and finished cells can be stacked on top of one another by the electrode stacking wheel.
• the electrode clamping element in particular elastically, is designed to be resilient, and the electrode element can be subjected to a spring force by the electrode clamping element.
• the spring-reducing property is made possible by the material and the material thickness of the electrode clamping element. Due to the resilient configuration, the clamping force can be provided passively, that is to say without external energy. On an electric actuator can in be waived in this case.
• the electrode clamping element can rest against the adjacent stacking finger in the clamping-free state and is only moved or pushed away from it by the electrode element inserted into the intermediate space.
• the electrode clamping element can provide the clamping force actively, in particular by means of an actuator, which is preferably designed electrically.
• the electrode clamping element is designed as part of the respective stacking finger.
• the electrode clamping element can be designed as a branch or branch of the stacking finger.
• the electrode clamping element is preferably designed to be narrower or thinner than the respective stacking finger.
• the electrode clamping element can be produced by making a half slot in the stacking finger. The half-slit partially separates the electric clamping element from the stacking finger. As a result of the partial separation, the electrode clamping element preferably remains connected to the stacking finger at a contact point and can be designed to be resilient thereon.
• the electrode clamping element is connected to the respective stacking finger by a contact point.
• the area of the contact point is preferably only so large that the electrode clamping element can be flexibly designed on the stacking finger.
• the contact point creates a possibility for the electric clamping element to be able to reliably provide the clamping force.
• the electrode clamping element is made of the same material as the stacking finger.
• the material is designed as plastic, for example.
• the electrode clamping element can be designed inexpensively and reliably.
• the invention also relates to an electrode stack device, in particular for producing an electrode stack for an accumulator or a fuel cell.
• the electrode stacking device has at least one electrode stacking wheel according to the invention.
• the electrode stack device has a plurality of electrode stack wheels according to the invention.
• the electrode stack device to have at least one clamping element-free stacking wheel, which is axially offset relative to the electrode stacking wheel and has the same axis of rotation.
• the combination of electrode stacking wheels with electrode clamping elements and stacking wheels without electrode clamping elements can further increase the accuracy of the transport of the electrode elements. It may be that a few electrode stacking wheels with electrode clamping elements, for example one or two, are sufficient to clamp the respective electrode element during transport. An excessive number of electrode clamping elements can have the disadvantage that the introduction of the electrode element into the gap is unnecessarily difficult, since the resistance of all the electrode clamping elements has to be overcome during the introduction.
• the invention relates to a further aspect of an electrode stacking device with a plurality of stacking wheels or electrode stacking wheels, which are arranged on a common axis of rotation.
• the stacking wheels or electrode stacking wheels can be arranged rotated with respect to the axis of rotation in addition to or as an alternative to being equipped with the electrode clamping element, i.e. rotated by the rotation in the direction of rotation in such a way that the intermediate spaces are no longer exactly aligned in the axial direction, but only aligned obliquely to the axial direction. This is advantageous because the electrode elements are clamped in by the stacking wheels which are twisted in relation to one another.
• the twisted stacking wheels can be formed in addition to the electrode clamping elements or else without the electrode clamping elements.
• the invention also relates to a method.
• an electrode stack in particular for an accumulator or a fuel cell, is produced with flat electrode elements.
• the following steps are carried out: a) providing an electrode element; b) rotating an electrode stack wheel about an axis of rotation; c) introducing the provided electrode element into an intermediate space formed by stacking fingers of the electrode stacking wheel; d) moving the introduced electrode element by the electrode stack wheel rotating about the axis of rotation; e) removing the moving electrode element from the gap; and f) creating the electrode stack with the electrode element removed from the gap.
• the electrode element is subjected to a clamping force by means of an electrode clamping element during the movement through the electrode stack wheel in a clamping position.
• the electrode element is in the clamping position when it is fixed by the electrode clamping element.
• the passive stripping element can be formed, for example, from a stripping arm against which the electrode elements are interlocked after the transport route has been completed by the electrode stack wheel and are automatically stripped out by the continuing rotation of the electrode stack wheel.
• the electrode element in step e) with an active stripping element, which overcomes the clamping force, from the intermediate space is removed.
• the active stripping element can be designed as a curve wheel, for example.
• the cam wheel can, for example, run along the electrode elements and actively scrape them out after the transport route has been completed.
• the active stripping element can be driven by the drive of the electrode stack wheel or by a separate, in particular dedicated, drive.
• the electrode element is decelerated by the electrode clamping element in step c). Due to the decelerating effect of the electrode clamping element, the electrode element can be arranged and transported more precisely in the intermediate space. Due to the more precise arrangement in the electrode stack wheel, in turn, the electrode element can also be placed more precisely on the electrode stack.
• the electrode element is conveyed into the clamping position in a controlled manner by a feeding device in step a).
• controlled means that the movement of the electrode element is not left to chance, as is the case, for example, with an unguided or free flight through the air.
• the position of the electrode element can essentially be influenced at any time.
• a controlled transport occurs, for example, when the electrode element is clamped by means of belts.
• the electrode element is preferably transported in a controlled manner by belts directly into the electrode stack wheel or the respective intermediate space and is clamped there by the electrode clamping elements.
• the guiding of the belt by the feed device is preferably terminated at the earliest when the electrode clamping elements are clamped.
• control over the electrode element is transferred from the feed device to the electrode stacking wheel from the time at which the electrode element is in the clamping position. So will the electrode element is preferably pushed into the intermediate space by the feed device until the electrode element is in the clamped state, then the feed device ends the movement and the control of the electrode element. The movement and control of the electrode element is then taken over or continued by the electrode stack wheel essentially seamlessly.
• the electrode stack can be produced more precisely as a result.
• the contact attachment is designed in particular as a raised segment that is only partially circumferential. Through the contact attachment, the respective electric element can be brought more precisely into the clamping position, since the start and end of the control can be determined more precisely by the feed wheel or the feed device.
• the electrode element can have a cell conductor.
• the cell conductor is used for electrically conductive contacting of the respective electrode element.
• Fig. 1 is a side view of a schematic representation of an exemplary embodiment of an electrode stacking wheel according to the invention with electrode clamping elements;
• FIG. 3 shows a schematic representation of an exemplary embodiment of an electrode stack device according to the invention with the electrode stack wheel and a feed device;
• Fig. 5 is a schematic representation of a further embodiment of the
• Electrode stacking device with several electrode stacking wheels and stacking wheels without clamping elements.
• Fig. 1 shows a schematic of an embodiment of an electrode stack wheel 1 with an axis of rotation 2.
• Stacking fingers 3 are arranged around the axis of rotation 2 .
• the stacking fingers 3 are arranged, in particular, radially to the axis of rotation 2 , i.e. the stacking fingers 3 are arranged such that they protrude from the axis of rotation 2 .
• the stacking fingers 3 have a curvature 4 according to the exemplary embodiment.
• the curvature 4 runs counter to a running direction or direction of rotation 5 of the electrode stack wheel 1.
• the stacking fingers 3 are therefore curved, in particular counterclockwise.
• the thickness of the respective stacking finger 3 decreases essentially with increasing distance from the axis of rotation 2.
• a pocket-shaped space 6 is formed between the stacking fingers 3 in each case.
• the intermediate space 6 is designed to accommodate a flat electrode element 7 (shown in FIGS. 3 to 5).
• the intermediate space 6 is preferably designed to be open in both axial directions.
• the electrode stack wheel 1 rotates about the axis of rotation 2.
• the electrode stack wheel 1 rotates clockwise as viewed in the image plane of FIG.
• the rotation speed is preferably at least 20 rpm.
• the rotational speed can be, for example, up to a maximum of 60 revolutions per minute.
• the rotational speed depends on the number of gaps in relation to the transport speed of the electrode elements.
• An electrode clamping element 8 is formed in each of the gaps 6 .
• the electrode clamping element 8 applies a clamping force to a main surface 9 (shown in FIG. 5) of the electrode element 7 .
• the clamping force has a direction of action 10 which, in the clamping state, acts in the direction of an adjacent stacking finger or an inserted electrode element 7 .
• the electrode clamping element 8 is preferably made of the same material, in particular plastic, as the stacking finger 3 .
• FIG. 1 A detail 11 of the electrode stack wheel 1 is marked in FIG. 1, which is described in more detail in FIG. 2 shows the detail 11 of the electrode stacking wheel 1.
• the electrode clamping element 8 is designed as part of the stacking finger 3.
• FIG. The electric denklemmelement 8 is only partially separated from the stacking finger 3 by a half slot 12 .
• the electrode clamping element 8 is connected to the stacking finger 3 at a contact point 23 .
• the electrode clamping element 8 is flexible enough that it can spring or can provide a spring force. The spring force is exerted on the electrode element 7 in the clamped state.
• Fig. 3 schematically shows an electrode stacking device 13 with the electrode stacking wheel 1 and a feed device 14.
• the electrode stacking device 13 is designed with a plurality of electrode stacking wheels 1 .
• the electrode stack wheels 1 are arranged on the common axis of rotation 2 .
• the electrode stacking device 13 has a stripping element 15 and a stacking base 16 .
• an electric stack 17 is formed on the stack bottom 16 .
• Electrode elements 7 are fed to the electrode stacking wheel 1 or the electrode stacking wheels 1 by means of the feed device 14 . Received in the respective intermediate space 6 and clamped by the associated electrode clamping element 8 . Then the electrode element 7 is transported by means of the electrode stacking wheels 1 by the electrode stacking wheels 1 rotating.
• Aussteifelement 15 the Elektiodenelement 7 is then removed from the gap 6, wherein it is on the stack base 16 or elec-rod elements 8, which are already on the stack base 16, is placed.
• the stripping element 15 is passive according to the embodiment. However, it can also be designed as an active stripping element, for example as a cam wheel, which is driven by an electric drive unit.
• the respective electrode element 7 is checked without interruption either by the feed device 14 or the electrode stacking wheels 1 .
• the feed device 14 has an upper belt 18 and a lower belt 19 .
• the belts 18, 19 are moved so that the respective electrode elements 7 are transported to the electrode stacking wheel 1.
• the lower strap is shorter than the upper strap.
• the respective electrode element 7 can be guided or pushed into the electrode stack wheel 1 in a controlled manner.
• Fig. 4 shows a schematic detailed representation of the feed device 14.
• the feed device 14 has a feed wheel 20 .
• the feed wheel 20 pushes the respective electrode element 7 into the intermediate space 6 until it is subjected to a clamping force by the electrode terminal element 8 and is thereby fixed.
• the feed wheel 20 has a contact attachment 21 .
• the contact attachment 21 is raised and only partially, in particular less than 180°, is designed to run around the feed wheel 20 .
• only the contact attachment 21 contacts the respective electrode element 7, in particular the main surface 9. If the feed wheel 20 is aligned in such a way that the contact attachment 21 does not point in the direction of the upper belt 18, the electrode element 7 is no longer pushed by the feed wheel 20.
• the contact attachment 21 is therefore advantageous in order to interrupt the effect of the feed force from the feed wheel 20 on the respective electrode element 7 .
• the clamping of the electrode element 7 between the contact attachment 21 and the upper belt 18 or a counter-wheel of the upper belt 18 only begins when the electrode element 7 is already partially in the intermediate space 6 .
• the clamping between the Kon clock attachment 21 and the upper belt 18 is preferably terminated before the electrode element 7 is completely in the gap 6.
• the feed wheel 20 continues to rotate clockwise in the image plane of FIG. 4 until the contact cap 21 is aligned opposite the upper belt 18 again. Then one of the electrode elements 7 can be contacted and moved again.
• the feed wheel 20 can be coupled to the drive of the lower belt 19 or driven by a separate drive.
• Fig. 5 schematically shows an embodiment of the electrode stack device 13.
• Two electrode stack wheels 1 each with electrode clamping elements 8 are arranged on the axis of rotation 2 .
• a clamping element-free stacking wheel 22 is arranged on the axis of rotation 2 between the two electrode stacking wheels 1 .
• the clamping element-free stacking wheel 22 does not have any electrode clamping elements 8, but is otherwise designed in particular analogously to the electrode stacking wheel 1.
• the combination of the electrode stacking wheels 1 with the clamping element-free stacking wheel 22 can ensure that the electrode elements 7 are clamped, but can nevertheless be easily inserted into the gaps 6 .
• the electrode stack wheels 1 and/or the stack wheel 22 can be arranged slightly twisted on the axis of rotation 2, so that the intermediate spaces 6 of the respective wheels 1, 22 are not exactly aligned in the axial direction.
• the electrode elements 7 can also be fixed.
• the twisted stacking wheels can be an alternative or a supplement to the electrode clamping elements 8 .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Secondary Cells (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=81384837

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (10)

• 2021
  • 2021-04-08 DE DE102021001819.2A patent/DE102021001819A1/de not_active Withdrawn
• 2022
  • 2022-04-01 KR KR1020237037717A patent/KR20230167069A/ko unknown
  • 2022-04-01 CN CN202280027020.0A patent/CN117120355A/zh active Pending
  • 2022-04-01 WO PCT/EP2022/025128 patent/WO2022214217A1/de active Application Filing
  • 2022-04-01 EP EP22718068.4A patent/EP4320061A1/de active Pending

Also Published As

Similar Documents

Legal Events