WO2023072343A1 - Procédé et dispositif de fabrication d'empilements de cellules pliés en z - Google Patents

Procédé et dispositif de fabrication d'empilements de cellules pliés en z Download PDF

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Publication number
WO2023072343A1
WO2023072343A1 PCT/DE2022/100793 DE2022100793W WO2023072343A1 WO 2023072343 A1 WO2023072343 A1 WO 2023072343A1 DE 2022100793 W DE2022100793 W DE 2022100793W WO 2023072343 A1 WO2023072343 A1 WO 2023072343A1
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WO
WIPO (PCT)
Prior art keywords
cell
gripper
cell component
separator
separator web
Prior art date
Application number
PCT/DE2022/100793
Other languages
German (de)
English (en)
Inventor
Patrick HIERL
Tobias SCHATZ
Michael Rathgeb
Moritz GLÜCK
Original Assignee
Grob-Werke Gmbh & Co. Kg
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 Grob-Werke Gmbh & Co. Kg filed Critical Grob-Werke Gmbh & Co. Kg
Publication of WO2023072343A1 publication Critical patent/WO2023072343A1/fr

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Classifications

    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • 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
    • H01M50/466—U-shaped, bag-shaped or folded

Definitions

  • the invention relates to a method for producing z-folded cell stacks.
  • the invention further relates to a device for producing z-folded cell stacks.
  • the invention lies in the field of manufacturing electrode arrangements and in particular battery cells and cell assemblies therefor. More particularly, the invention is in the technical field of large-scale systems for large-scale production of battery cells.
  • battery cells for use in electromobility in particular battery cells for the main power supply of electric vehicles, such as in particular passenger cars and trucks, are to be mass-produced.
  • [14] discloses a first basic method for producing a z-stacked cell stack from first cell components, such as in particular anodes, and second cell components, such as in particular cathodes, and a z-folded separator web in between, in which the cell stack is produced by moving a stacking table becomes.
  • [15] discloses a second basic method for producing a z-stacked cell stack from first cell components, such as in particular anodes, and second cell components, such as in particular cathodes, and a z-folded separator web in between, in which the cell stack is produced by supplying the cell components and the stacking table stops.
  • a gripping device such as a device with Bernoulli grippers, is used to transport the electrodes from a supply to the stacking station.
  • the separator is fed continuously and can be moved from one side of a stacking station to the opposite side of the stacking station with a corresponding separator guide unit and deposited on the stacking station.
  • hold-down devices are used which can be moved in several directions relative to the stacking station and with which the stack formed on the stacking station can be clamped.
  • the method is carried out similarly in reference [10].
  • the band-shaped separator is guided over the stacking table with a reciprocating device and the electrodes are fed in via a corresponding holding and moving device.
  • Hold-down devices that can be inserted from the side are also described here.
  • a protective function is shown here, since the hold-down devices are designed in such a way that they protect the edges of the electrodes when the separator is folded around the electrode edge in each case.
  • the electrodes are also fed to the stacking table and the cell stack is fixed in each case via a holding element (down clamp) after the separator has been applied.
  • the electrodes are arranged on two opposite sides of the stacking table and are lifted from there by means of suction grippers and fed to the cell stack, although they are positioned in a pre-depositing position before being placed on the stack.
  • Axis 1 put the anode on
  • Axis 1 put the anode on
  • Axis 2 Turn over separator etc.
  • the object of the invention is to provide a device and a method for Z-folding cell components, in particular for a battery cell or the like, in which the process time is reduced.
  • the invention provides a method and a device according to the independent claims.
  • a controller and a computer program with instructions for automatically carrying out the method are also specified.
  • Advantageous configurations are the subject matter of the dependent claims.
  • the invention provides a method for producing z-folded cell stacks, comprising: a) providing first and second cell components and providing a separator web, b) alternately stacking the first and second cell components, the separator web being inserted in between in a z-shaped or meandering manner in such a way that that it is alternately wrapped around a first cell component on a first side and then wrapped around a subsequently deposited second cell component on a second side opposite the first side, in order to obtain a cell stack in this way, step b) comprising: b1) gripping a first cell component with a first gripper and feeding the first cell component with the first gripper by moving to the first side and depositing the first cell component, b2) wrapping the separator web around the first cell component fed in step b1) by means of a first wrapping element arranged on the first gripper, wherein the first wrapping element grips the separator web when the first cell component is fed in and moves it to the first side and releases it again when the first gripper is returned after the
  • Step b) preferably includes b7) guiding a region of the separator web located above the grippers by means of a guide element which is arranged on one of the grippers and moves with it.
  • step b1) and/or step b4) includes: ba) aligning the cell component to be deposited by means of an adjustment mechanism on the associated gripper.
  • Step ba) preferably includes the step: ba1) detecting the current position of the cell component on the gripper and comparing it with a target position.
  • Step ba) preferably includes the step: ba2) optically detecting the position of at least two spaced cell component areas before or after being gripped by the gripper.
  • Step ba) preferably comprises the step: ba3) rotating the cell component about an axis extending transversely to the cell component.
  • Step ba) preferably comprises the step: ba4) displacing the cell component transversely to the direction of movement of the grippers.
  • the cell component (in particular its current position) is preferably recorded after it has been recorded, in particular after it has been sucked in, with the gripper.
  • Step a) preferably includes the step: a1) Providing the first cell components by means of a first cell component magazine and providing the second cell components by means of a second cell component magazine.
  • step a) comprises the step: a2) detecting the position of the first and second cell components by means of image processing.
  • Step a) preferably includes the step: a3) detecting the position of the cell components by means of image processing on an associated magazine.
  • Step a) preferably includes the step: a4) gripping and depositing the first and second cell components on at least one intermediate location and position detection at the intermediate location, in particular by means of image processing and providing the first and second cell components on the at least one intermediate location.
  • the invention provides a device for producing z-folded cell stacks in which first cell components and second cell components are stacked alternately on top of one another, with a separator web being inserted between adjacent cell components in a z-shaped or meandering manner in such a way that they alternate on a first side a first cell component is folded over in each case and a second cell component is folded over in each case on a second side opposite the first side, the device comprising: a first gripper for supplying a first cell component to the cell stack, a second gripper for supplying a second cell component to the cell stack, a separator web feed for feeding the separator web with a wrapping device with at least one wrapping element for wrapping the separator web around the cell components respectively supplied by the grippers, and a controller for controlling the grippers and the separator web guide, the wrapping device having a first wrapping element arranged to move along with the first gripper for wrapping the separator web around a first cell component supplied by the first gripper and a second wrapping element
  • the respective cover element is arranged laterally to a gripping area for receiving the cell component.
  • the respective turning element is configured as a roller rotatably mounted on the associated gripper or as a sliding edge arranged on the associated gripper.
  • the respective envelope element can also be or have a blowing bar with blowing nozzles.
  • the wrapping device has a guide element for guiding a region of the separator web to be guided to the wrapping elements, the guiding element being arranged on one of the grippers above the wrapping element arranged on this one gripper and offset from this wrapping element in the direction of the other gripper .
  • the guide element has at least one guide roller or at least one guide edge for guiding the separator web. It is preferred that the guide member has a plurality of guide rollers and/or guide edges for guiding the separator sheet therebetween. In addition or as an alternative, the guide element can also be equipped with blower strips or blower nozzles.
  • the grippers each have a base movable by a gripper moving device and a gripping portion.
  • the gripping area is provided with a suction device.
  • the gripping area can be adjusted at least one-dimensionally or at least two-dimensionally relative to the base by means of an adjustment mechanism in order to align the cell components to be deposited.
  • the device has a preferably optical position detection device for detecting the position of the cell component to be deposited, the adjustment mechanism being designed to align the cell component as a function of the detection.
  • At least one position detection device is preferably provided for each cell component.
  • a first position detection device is preferably provided for detecting the position of the first cell component.
  • a second position detection device is preferably provided for detecting the position of the second cell component.
  • the adjustment mechanism is preferably designed to rotate the cell component on the gripper about an axis running transversely to the extension of the cell component.
  • the adjustment mechanism is preferably designed to rotate the cell component in the plane of the cell component (preferably horizontally).
  • the adjustment mechanism is preferably designed to displace the cell component transversely to the direction of movement of the gripper during feeding.
  • the device preferably also comprises a holding device for holding down the deposited cell components.
  • the holding device has at least one first hold-down finger, which can preferably be retracted and pulled out transversely to the separator web, for holding down the deposited cell component or the deposited cell component and the separator web on the first side.
  • the holding device has at least one second hold-down finger, which can preferably be retracted and pulled out transversely to the separator web, for holding down the deposited cell component or the deposited cell component and the separator web on the second side.
  • the device preferably has a device for moving the at least one hold-down finger up and down (vertical axis, eg y-axis). Holding down preferably takes place in a force-controlled manner.
  • the device for moving the at least one hold-down finger up/down is preferably set up to carry out the hold-down in a force-controlled manner.
  • the device preferably has a stationary stacking table on which the stacking takes place.
  • the device preferably has a first magazine for providing the first cell components.
  • the device preferably has a second magazine for providing the second cell components.
  • controller is set up to control the device for carrying out the method according to one of the above method configurations.
  • the invention provides a controller for a device according to one of the above device configurations, the controller being set up to control the device for carrying out the method according to one of the above method configurations.
  • the invention creates a computer program, comprising instructions which cause a device according to one of the above device configurations to carry out the method according to one of the above method configurations.
  • Preferred configurations of the invention relate to a method for turning over separators in cell stack formation.
  • Preferred configurations of the invention relate to a method for stacking, in particular laminated and/or glued, cell stacks, in particular for battery cells, with a first cell component and a second component being stacked on top of one another in alternation with a separator in between, with the separator being designed as a separator web which Z-shaped or meandering through the cell stack.
  • Preferred configurations of the method include the step: combined depositing of the respective cell component and simultaneous turning over of the separator.
  • Preferred configurations of the invention further relate to a device for stacking cell stacks, in particular laminated and/or glued ones, in particular for battery cells, wherein a first cell component and a second component are stacked alternately on top of one another with a separator in between, the separator being designed as a separator web, which is guided through the cell stack in a Z-shape or in a meandering shape and is wrapped around the cell components.
  • Preferred configurations of the device include: a first gripper for supplying a first cell component to the cell stack, a second gripper for supplying a second cell component to the cell stack, and a separator web feed for supplying the separator web and a controller designed in particular as an electronic control unit or computer unit for controlling the gripper and the separator web guide in such a way that the separator web is folded over at the same time as the cell component is deposited.
  • Preferred embodiments operate according to the basic second method with a preferably stationary stacking table and moveable grippers.
  • the great advantage of the second method is that the cell stack that is being built up is not moved. Thus, due to no dynamic influences, higher positional accuracies (position of the individual electrode sheets to one another) can be ensured.
  • each individual electrode in relation to one another is also decisive for the quality of a cell stack. For this reason, it is advantageous if the electrodes are aligned before they are placed on the stacking table and fixed using hold-down fingers.
  • the electrodes can be aligned passively, e.g. via mechanical stops, or actively. Active means that the position of the electrode is checked (e.g. using image processing) and then corrected using an adjustment mechanism. Either the position when picking up the electrode or the position of the electrode in the gripper can be changed.
  • positioning occurs after picking up the cell component from a pre-delivery position and feeding it to the stack. Pre-storage can be done in order to reduce the cycle time, especially when capturing the position of the electrode using a camera.
  • first and second grippers feed anodes and cathodes, respectively, and tumble the separator.
  • folding elements are provided on the gripper, which act on the separator web when the cell component is placed in order to support folding.
  • one or more hold-down fingers are provided or provided, which is/are designed to fix the electrode/cell component and the separator after the cell component/electrode has been laid down.
  • the at least one hold-down finger retracts laterally.
  • the at least one hold-down finger is preferably designed to prevent the individual layers or the entire stack from slipping/slipping.
  • the at least one hold-down finger is preferably designed to hold the separator in position when the gripper and the cover element move away from the stack again.
  • the laying-down movement of the cell component/electrode, which is held by the gripper, in particular a suction gripper or a mechanically acting gripper corresponds to an arcuate path, in particular a circular path.
  • the arcuate path/circular path is matched to the present dimensions of the electrode/cell component, in particular the width of the electrode/cell component, more particularly in such a way that a parameter of the movement path, in particular the radius, corresponds to the width of the cell component such as the electrode in particular.
  • the separator web before laying on a further electrode, with its free section essentially transversely, e.g. at an approximate 90° angle, to the stack, e.g.
  • the separator web is held in (this) position by hold-down fingers, so that the horizontal section of the separator covers the electrode laid down last; and/or iii) the next component (eg electrode) is placed on the last-placed component while the section of the separator web is held down in an overlapping manner; and/or iv) when the gripper is laid on, it is moved away in a circular motion, the separator being simultaneously placed with its free section over the last stacked electrode in a circular motion, the separator being guided by the folding element arranged on the gripper; and/or vi) in the method the sequence of steps i) ->ii) -> iii) -> iv) is carried out or in the device the control unit is designed (in particular programmed) the device for carrying out the sequence of steps i) ->ii)- >iii)->iv) to control.
  • an empty fold of the separator without a cell component is produced during stacking at the start of the stacking process or at the end of the stacking process for a cell stack.
  • the separator web is held in place for this purpose without a cell component being present on the corresponding gripper.
  • FIG. 1 shows a front view of a cell stack that is produced with an embodiment of a device and a method for producing cell stacks
  • Fig. 2 is a front view of the apparatus with a schematic representation of the stacking step of the method
  • FIG. 3 shows a front view of the initial situation on a stacking device of the device before the first cell component is placed on it;
  • FIG. 4 shows a front view of the stacking device and the cell stack formed by the stacking after the stacking step—it shows the situation after the end of the stacking process;
  • FIG. 5 shows a top view of the stacking device and the cell stack formed by the stacking after the stacking step—the situation after the end of the stacking process is shown;
  • FIG. 6 shows a schematic front view of parts of the device with a stylized, simplified representation of the function of a turnover device when building a cell stack—here when turning a separator to the right;
  • FIG. 9 shows a schematic front view of a gripper of the device according to an embodiment during depositing, with a first embodiment of a combined depositing and turning being indicated;
  • FIG. 10 shows a schematic front view of a gripper of the device according to a further embodiment during depositing, a second embodiment of a combined depositing and turning over being indicated;
  • FIG. 11 is a perspective view of a second gripper of the device according to a specific one preferred embodiment, wherein the second gripper is shown from the right and from the front (relative to the representation of Fig. 2);
  • FIG 12 is another perspective view of the second gripper, the second gripper being shown from the left and from the front;
  • FIG. 13 is a perspective view of a first gripper of the device according to a specific preferred embodiment, the first gripper being shown from the right and from the front (relative to the representation of FIG. 2);
  • FIG 14 is another perspective view of the first gripper, showing the first gripper from the left and from the front;
  • Fig. 15 is a front view of part of the apparatus showing the first and second grippers laying down a first cell component fed from the left in the figure;
  • FIG. 16 is a view as in FIG. 15, with the first and second grippers laying down a second cell component which is supplied from the right in the figure; is shown;
  • Figure 17 is a front view of part of the apparatus with the first and second grippers showing the geometry and arrangement of elements of a folder;
  • Figs. 18a and 18b are plan views showing examples of cell components arranged on one of the grippers, with their position on the gripper being corrected;
  • FIG. 19 shows a schematic representation of the kinematics of an adjustment mechanism on the respective gripper for correcting the position of the cell components to be deposited.
  • 20 is a partially perspective, partially cut-away view of one of the grippers showing the components of the adjustment mechanism.
  • the cell stack 10 has first cell components 12 and second cell components 14, which are stacked alternately on top of one another and are separated from one another by means of a separator 16 folded around the cell components 12, 14 in a Z-shape or meander-shape.
  • the separator 16 formed by a separator sheet 26 is folded in FIG. 1 around the ends or edges of the first cell component 12 shown on the left and around the ends or edges of the second cell component 14 shown on the right.
  • the cell components 12, 14 are, for example, electrodes; in some embodiments, the first cell components 12 are anodes A and the second cell components are cathodes K. As can be seen in Figure 1, in the illustrated embodiment the anodes A and cathodes K have different dimensions in the direction of extension of the separator 16.
  • the separator 16 has an empty fold 18 below the bottom electrode A.
  • the separator 16 is also wrapped around the entire stack of cell components 12, 14 once more.
  • a free end 20 of the separator 16 is fixed by a suitable fixing means such as an adhesive strip 22 .
  • the cell stack shown in FIG. 1 is produced by Z-folding.
  • Z-folding represents one of the main processes for producing cell stacks 10 for battery cell assembly. Other processes include, for example, laminate stacking of mono cells, winding or single-sheet stacking. During Z-folding, cell components 12, 14 such as anodes A and cathodes K are alternately superimposed.
  • the insulating layer is formed by the separator 16, which is always placed between the layers in this process as a continuous material—separator web 26.
  • the separator 16 is always folded around the individual electrodes A, K so that it runs in the cell stack 10 in a Z-shape.
  • the separator 16 is finally wrapped around the entire cell stack 10 . This allows the entire cell stack 10 to be pre-fixed. After the separator 16 has been wound up, it is separated and the end 20 is fixed on the cell stack 10 with an adhesive strip 22 .
  • the complete separator 16 comes from one web. Therefore, in the embodiments of the device and method for production shown here, the stacking and winding takes place with a continuous separator 16.
  • an empty fold 18 This is either below the first layer, as shown in FIG. 1, or above the last layer.
  • the void fold 18 may be provided either before the first electrode - particularly anode A - or after the last electrode - particularly anode A. In some embodiments, this depends only on the folding direction of the separator 16 . In the illustrated embodiment, the separator 16 is always folded around the anode edge on the left in the illustration; this is just one of several examples.
  • FIG 1 shows the cell stack 10 after it has been wound and with the adhesive strip 22 applied.
  • the device 24 is a stacking system for large-scale production of battery cells.
  • other aspects are also in the foreground.
  • FIGS. 9 to 20 illustrate special features and functions of grippers 56.1, 56.2 of the device 24.
  • the device 24 comprises a first gripper 56.1 for feeding a first cell component 12 to the cell stack 10, a second gripper 56.2 for feeding a second cell component 14 to the cell stack, and a separator web feed 52 for feeding the separator web 26.
  • the separator web feed 52 has a device for providing the separator web 26, not shown in detail, which can have, for example, a roller holder with a roller for delivering the separator web and stationary guide elements such as deflection rollers or sliding edges for preparing the separator web 26 for the grippers 56.1, 56.2. Such elements are from the literature references mentioned at the outset and are therefore not explained in more detail.
  • the separator web feed 52 for feeding the separator web 26 into the cell stack 10 also has a wrapping device 28 with at least one wrapping element 30.1, 30.2 for wrapping the separator web 26 around the cell components 12, 14 fed by the grippers 56.1, 56.2.
  • the device 24 also has a controller 34 for controlling the grippers 56.1, 56.2 and the separator web feed 52.
  • the wrapping device 52 has a first wrapping element 30.1, arranged to move with the first gripper 56.1, for wrapping the separator web 26 around a first cell component 12 fed by the first gripper 56.1, and a second wrapping element 30.2, arranged to move with it on the second gripper 56.2, for wrapping the separator web 26 around a second cell component 14 fed to the second gripper 56.2.
  • the device 24 has the electronic control 34 indicated in FIG. 2 with a corresponding computer program.
  • the controller 34 is designed to control the individual devices/units or stations of the device 24, which are explained in more detail below, for carrying out the method, which is also explained in more detail below.
  • the computer program contains the appropriate instructions for this.
  • the device 24 has a stacking device 36, of which embodiments are explained in more detail below.
  • the stacker 36 includes a stacking table 38 (example of pad) and a holding means 40 having first and spaced apart second hold down fingers 42a, 42b for holding down the stacked cell components 12, 14 during the Z-folding of the separator 16.
  • At least one hold-down finger 42a, 42b is provided in each corner area, i.e. a total of at least four hold-down fingers 42a, 42b, which move in a direction that is essentially parallel to the surface of stacking table 38 for feeding in and out and in a direction that is essentially parallel to the surface of stacking table 38 vertical direction for clamping and descendants are movable in height.
  • the hold down fingers 42a, 42b are set at a slight angle so that there is no relative movement on the cell stack.
  • the hold-down fingers 42a, 42b can also be moved obliquely to the surface of the stacking table 38.
  • the hold-down fingers 42a, 42b can be moved up and down by means of a device not shown in detail. Holding down is force-controlled.
  • the stacking device 36 of the illustrated embodiment has a cathode magazine 44, a cathode gripper that can be moved back and forth between the cathode magazine 44 and the stacking table 38 for supplying cathodes K as an exemplary embodiment for the first gripper 56.1, an anode magazine 48 and one between the anode magazine 48 and the stacking table 38 for delivering anodes K to and fro movable anode gripper as an embodiment of the second gripper 56.2.
  • the magazines 44, 48 provide the first and second cell components 12, 14.
  • the separator web feed 52 is also shown in FIG. 2 .
  • Its turning device 28 causes the separator web 26 to be turned over with its turning elements 30.1, 30.2 arranged to move along with it on the grippers 56.1, 56.2.
  • the stacking method that can be carried out by means of the device 24 is shown schematically in FIGS.
  • the stacking method includes: a) providing the first and second cell components 12, 14, here in the form of the anodes and cathodes A, K, and providing the separator web 26 and b) generating the cell stack 10 by alternately placing the anodes A and cathodes K of both sides (see Fig. 2).
  • step b) includes: alternately stacking the first and second cell components 12, 14, wherein the separator web 26 is inserted in a z-shaped or meandering manner in between such that it alternates on a first side S1 (see Fig. 1). a first cell component 12 is turned over and then on a second side S2 opposite the first side S1 is turned over a subsequently deposited second cell component 14 in order to obtain a cell stack 10 in this way.
  • step b) comprises the sub-steps: b1) gripping a first cell component 12 with the first gripper 56.1 and feeding the first cell component 12 with the first gripper 56.1 by moving to the first side S1 and depositing the first cell component 12, b2) turning over the Separator web 26 around the first cell component 12 supplied in step b1) by means of a first wrapping element 30.1 arranged on the first gripper 56.1, wherein the first wrapping element 30.1 grips the separator web 26 when the first cell component 12 is fed in and moves it to the first side S1 and when the first gripper 56.1 releases again after depositing the first cell component 12, b3) holding the deposited first cell component 12, b4) gripping a second cell component 14 with the second gripper 56.2 and feeding the second cell component 14 with the second gripper 56.2 by moving to the second Side S2 and depositing the second cell component 14, b5) wrapping the separator web 26 around the second cell component 14 supplied in step b4) by means of a second wrapping element 30.2 arranged on the second gripper 56.2,
  • step b) bi)
  • the separator 16 is fixed on the stacking table 38 in front of the first layer using hold-down fingers 42a, 42b.
  • the separator web 26 is fed in from the right side from above (see FIG. 3).
  • the first anode A is then inserted from the right, positioned on the stacking table 38 and then held down on the left side of the stacking table 38 by the first hold-down fingers 42a.
  • the empty fold 18 is produced at the same time, since the separator 16 is turned over from right to left.
  • the wrapping with the separator sheet 26 can take place. Wrapping is only one advantageous embodiment of the method, according to other embodiments the cell stacks 10 are fixed in a different way or used without wrapping. Accordingly, the device 24 may or may not be provided with further wrapping devices (not shown here).
  • FIGS. 6 to 8 show a schematic front view of parts of the stacking device 36 with a stylized, simplified representation of the handling device 28 during the construction of a cell stack 10 - here when the separator 16 is being folded over to the right - while FIGS. 7 and 8 also show the above-mentioned Feeding the first hold-down finger 42a and pressing down the separator 16 onto the cell stack 10 is shown.
  • the separator 16 is folded over the last deposited cell component 12 by means of the folding device 28 and the folding elements 30.1, 30.2 acting on the separator 16.
  • the hold-down finger 42a then presses the separator 16 onto the cell stack 10.
  • the second hold-down fingers 42b are pulled out of the cell stack 10 on the left-hand side.
  • the envelope unit of the envelope device 28 then moves to the left again, so that the separator 16 is now folded around the right hold-down fingers 42a.
  • the left-hand hold-down fingers 42b press the separator 16 down again, so that the z-folded cell stack 10 is formed.
  • the embodiments of the method and the device described here initially have the advantage of minimizing the process times for laying and turning to a significant extent.
  • the electrode gripper is designed to be displaceable and rotatable in the plane.
  • the folding element 30.1, 30.2 is preferably aligned in a fixed manner in the plane in order to deposit the separator 16 correctly.
  • the separate tucking motion or holding down of the separator is replaced by a combined deposition of the electrode and simultaneous tucking of the separator.
  • a novel gripper design enables active position correction of the electrode.
  • the depositing movement of the cell component 12, 14, which is held by one of the grippers 56.1, 56.2, embodied, for example, as a suction gripper or as a mechanically acting gripper, can correspond to a circular path.
  • This circular path is in turn matched to the existing cell component dimensions (usually the electrode width of the electrodes to be laid down in each case).
  • folding elements 30.1, 30.2 of the folding device 28 are attached to the grippers 56.1, 56.2.
  • these turn-up elements 30.1, 30.2 can be embodied as either rollers or slide elements. Blow bars with blow nozzles are also possible.
  • FIG. 9 the movement sequence for the deposit is shown schematically with a circular path.
  • 10 shows a variant of the movement sequence with a circular path in combination with a straight deposit and/or straight delivery of the grippers 56.1, 56.2.
  • the overall structure of the device 24 thus provides at least two grippers 56.1 , 56.2 which respectively feed in anodes and cathodes and turn the separator 16 over.
  • the device 24 according to some exemplary embodiments has a first and a second position detection device 54.1, 54.2 for detecting the position of the cell components 12, 14 before gripping, during gripping or preferably shortly after gripping.
  • the position of the cell components 12, 14 is preferably detected by image processing in the respective magazine 44, 48. It is sufficient if two opposite corners of a cell component 12, 14, in particular electrodes A, K, are detected.
  • the system structure is also expanded by one, two or more intermediate locations, ie the electrodes K, A are not transferred directly from the magazine 44, 48 to the cell stack 10, but are previously placed again in an intermediate location and there captured by image processing.
  • the position detection devices 54.1, 54.2 are assigned to the at least one intermediate location.
  • the wrapping device 28 has a first wrapping element 30.1 arranged to move with it on a first gripper 56.1 and a second wrapping element 30.2 arranged to move with it on a second gripper 56.2.
  • the first wrapping element 30.1 serves to wrap the separator web 26 around a first cell component 12 supplied by the first gripper 56.1.
  • the second wrapping element 30.2 serves to wrap the separator web 26 around the second cell component 14 supplied by the second gripper 56.2.
  • the turning device 28 also has a guide element 58 for guiding an area of the separator web 26 to be guided to the turning elements 30.1, 30.2.
  • the guide element 58 is arranged on one of the grippers 56.2 above the turn-up element 30.2 arranged on this one gripper 56.2 and offset from this turn-up element 30.2 in the direction of the other gripper 56.1.
  • the guide element 58 can optionally be arranged on the first or second gripper 56.1, 56.2, ie for example the anode gripper or the cathode gripper.
  • the guide element 58 is arranged on the second gripper 56.2, which can be fed in from the left in the figures and feeds in the second cell components 14, here e.g. the cathodes.
  • the guide element 58 has at least one guide roller 60.1 or alternatively or additionally at least one guide edge.
  • the guide element 58 can also have a plurality of guide rollers 60.1, 60.2 or guide edges, e.g. the separator web 26 can be guided between a pair of rollers 60.1, 60.2 or edges, respectively. Blow strips or blow nozzles for guiding the separator web 26 on an air cushion are also possible.
  • the grippers 56.1, 56.2 each have a base 64, which can be moved by a gripper movement device 62, and a gripping area 66.
  • the gripper moving device 62 is controlled by the controller 34 and is designed to move the grippers 56.1, 56.2 between the respective magazines 44, 48, the stacking table 38 and possibly the optional intermediate locations.
  • the gripper movement device 62 is e.g. as a linear movement device for moving the grippers 56.1, 56.2 in the x-direction (the coordinate system is indicated in Fig. 15 and 18b), possibly with a lifting arrangement for moving in the vertical y-direction or as a portal arrangement or x-y adjusting device formed or has e.g. robotic arms.
  • the gripping area 66 is designed to grasp and hold the respective cell component 12, 14 in place. This can be done in different ways.
  • the gripping area 66 is provided with a suction device 68 .
  • the suction device 68 includes at least one suction connection 76 for a line to a pump or the like and a suction plate 78 Suction openings (not visible in the figures).
  • the cell components 12 , 14 are in contact with the suction plate 78 during suction.
  • the first flap element 30.1 is fixed to the base 64 of the first gripper 56.1 - stationary to this base 64 - while the second flap element 30.2 to the base 64 of the second gripper 56.2 - fixed to this base 64 - is fixed.
  • the respective folding element 30.1, 30.2 is arranged at the level of the gripping area 66, more precisely at the level of the suction plate 78.
  • the respective base 64 can have, for example in one piece or as an additional construction, an envelope element holder 72 for holding or storing the envelope element 30.1, 30.2.
  • 30.2 are designed here as envelope rollers, which are rotatably mounted on the envelope element holder 72.
  • the guide element 58 is also attached to the base 64 of one of the grippers 56.2.
  • the cover element holder 72 for example of the second gripper 56.2, has an additional arm 74, on which the guide element 58, viewed from the first cover element 30.1, can be attached laterally in the x-direction (direction of movement of the grippers). is arranged offset towards the other gripper 56.2 and is arranged in the vertical direction (y-direction) above the first envelope element 30.1 and here also above the second envelope element 30.2.
  • the guide element 58 has a first and a second guide roller 80.1,
  • 15 and 16 illustrate the combined movement of the grippers 56.1, 56.2 with the moving handling device 28, as a result of which the separator is deposited directly on the cell stack.
  • FIG. 15 shows the placement of an electrode from the left. In particular, the laying down of the electrode and the simultaneous turning over of the separator (coming from the left) are shown.
  • the guidance of the separator 16 on the guide element 58 and the second turning element 30.2 when the second cell component 14 is fed in by the second gripper 56.2 is shown.
  • the upper part of the separator 16 is guided by means of the guide element 58, while the separator 16 is gripped by the second wrapping element 30.2 when the second gripper 56.2 moves to the right in Fig. 15 (ie towards the second side S2) in order to move the separator 16 around to turn supplied second cell component 14 on the second side S2.
  • FIG. 16 shows the placement of an electrode from the right. In particular, the laying down of the electrode and the simultaneous turning over of the separator (coming from the right) are shown.
  • the guide of the separator 16 on the guide element 58 and the first turning element 30.1 when the first cell component 14 is fed in by the first gripper 56.1 is shown.
  • the upper part of the separator 16 is guided by means of the guide element 58, while the separator 16 is gripped by the first wrapping element 30.1 when the first gripper 56.1 moves to the right in Fig. 16 (i.e. towards the first side S1) in order to move the separator 16 when Feeding the first gripper 56.1 to turn over the fed first cell component 12 on the first side S1.
  • Fig. 17 shows the relative arrangement of guide element 58 and turnover elements 30.1, 30.2 in the exemplary embodiment shown as an example of the design of the deflection units 30.1, 30.2, 58 of the turnover device 28.
  • the respective gripper 56.1, 56.2 has an adjustment mechanism 70.
  • the independent adjustment mechanism 70 is integrated into the grippers 56.1, 56.2 so that the electrodes can always be placed in the correct position on the cell stack 10 despite the folding elements 30.1, 30.2 located on the grippers 56.1, 56.2.
  • the adjustment mechanism enables position correction in a longitudinal and in a rotational direction.
  • the two corrections are shown in FIGS. 18a and 18b.
  • 18a shows the position correction in the z-axis.
  • 18b shows the position correction around the y-axis.
  • the gripping area 66 can be adjusted at least one-dimensionally or at least two-dimensionally relative to the base 64 by means of the adjustment mechanism 70 in order to align the cell components 12, 14 to be deposited.
  • the adjustment mechanism 70 is designed in particular to move the respective cell component 12, 14 by relative movement of the gripping area 66 relative to the base 64 in the transverse direction z, transversely to the movement of the grippers 56.1, 56.2 when the cell components 12, 14 ( x-direction).
  • the adjustment mechanism 70 is designed to align the cell components 12, 14 by rotating the gripping area 66 relative to the base about the vertical axis y.
  • the position of the cell component 12, 14 on the gripper 56.1, 56.2 is optically detected by the position detection device 54.1, 54.2 during or shortly after the gripping. Any corrections to be made in the x-direction are made by the gripper movement device 62, corrections in the z-direction and in the angle by the adjusting mechanism 70 the gripper 56.1,
  • the adjustment in the z-axis and around the y-axis can be combined so that the position of the electrodes can be adjusted correctly at any time.
  • the adjustment mechanism 70 is thus designed to move the gripper 56.1,
  • the gripped cell component 12, 14 in the extension plane of the cell component 12, 14 (e.g. electrode plane, i.e. e.g. the horizontal plane referred to as the x-z plane in the illustration in Fig. 18a, 18b).
  • electrode plane i.e. e.g. the horizontal plane referred to as the x-z plane in the illustration in Fig. 18a, 18b.
  • FIG. 19 schematically shows the structure of the adjusting mechanism 70 with a first drive 82.1, a second drive 82.2 and a lever kinematics 94 for connecting the gripping area 66 to the base 68 and for adjusting the respective gripper 56.1, 56.2.
  • the lever kinematics 84 has connecting levers 90.1, 90.2 and swivel joints 92.1, 92.2.
  • the gripping area 66 is rotated relative to the base about the vertical axis y.
  • the gripping area 66 is rotated relative to the base in the transverse direction z delay.
  • the 20 shows the structural design of the bearing in the form of a gripper connection 84 for connecting the gripping area 66 to the base.
  • the drives 82.1, 82.2 are arranged on the base 66.
  • the gripper connection 84 is designed as a rod-shaped or tubular connecting element with two ends that can be rotated relative to one another by means of a pivot bearing 88, one end of which is attached to the base 66 with a linear guide 86 and the other end is attached to the gripping area 66, here with the suction plate 78 and the ones on it attached suction ports 76, carries.
  • the electrode and separator 16 are fixed using hold-down finders 42a, 42b, which retract laterally. These prevent the individual layers or the entire stack from slipping/slipping.
  • the hold-down fingers 42a, 42b thus hold the separator 16 in position when the grippers 56.1, 56.2 and the envelope element 30.1, 30.2 move away from the stack again.
  • Shape and geometry of the turning element 30.1, 30.2, this can be designed either as a mounted roller or deflection roller or as a fixed element (e.g. milled part with deflection edge).
  • Advantages of particularly preferred embodiments of the method and the device 24 lie in a reduced cycle time and in the increase in process reliability by avoiding the formation of folds.
  • the vertical strokes of the hold-down fingers 42a, 42b can be reduced, which in turn creates space in the system.
  • actuators and sensors can also be saved. In this way, the system costs can also be reduced accordingly.
  • a method and a device (24) for producing z-folded cell stacks have been described, wherein a separator web (26) is z-shaped around alternately stacked first and second Cell component (24, 26) is handled.
  • a turning over takes place when the respective cell component (12, 14) is fed in by means of a turning over element (30.1, 30.2) arranged to move along with a respective gripper (56.1, 56.2).

Abstract

L'invention concerne un procédé et un dispositif (24) pour la fabrication d'empilements de cellules pliés en z, une bande de séparation (26) étant rabattue en forme de z autour de premiers et de deuxièmes composants de cellule (24, 26) empilés alternativement. L'invention vise à réduire sensiblement le temps de traitement. A cet effet, le rabattement est réalisé lors de l'amenée du composant de cellule respectif au moyen d'un élément de rabattement (30.1, 30.2) disposé sur un élément de préhension respectif (56.1,56,2) de manière à se déplacer avec celui-ci.
PCT/DE2022/100793 2021-10-29 2022-10-25 Procédé et dispositif de fabrication d'empilements de cellules pliés en z WO2023072343A1 (fr)

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DE102021128321 2021-10-29

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120110836A1 (en) * 2009-04-28 2012-05-10 Sk Innovation Co., Ltd. Method for preparing secondary battery
DE102012019975B3 (de) * 2012-10-04 2013-11-14 Jonas & Redmann Automationstechnik Gmbh Vorrichtung zur Herstellung von Elektrodenstapeln
US20140237808A1 (en) * 2013-02-26 2014-08-28 Hitachi Power Solutions Co., Ltd. Stacked Cell Manufacturing Method and Apparatus Using the Same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120110836A1 (en) * 2009-04-28 2012-05-10 Sk Innovation Co., Ltd. Method for preparing secondary battery
DE102012019975B3 (de) * 2012-10-04 2013-11-14 Jonas & Redmann Automationstechnik Gmbh Vorrichtung zur Herstellung von Elektrodenstapeln
US20140237808A1 (en) * 2013-02-26 2014-08-28 Hitachi Power Solutions Co., Ltd. Stacked Cell Manufacturing Method and Apparatus Using the Same

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