EP4097785A1 - Connexion d'un empilement d'éléments avec au moins un élément de contact, sous vide au moyen d'un laser - Google Patents

Connexion d'un empilement d'éléments avec au moins un élément de contact, sous vide au moyen d'un laser

Info

Publication number
EP4097785A1
EP4097785A1 EP21703632.6A EP21703632A EP4097785A1 EP 4097785 A1 EP4097785 A1 EP 4097785A1 EP 21703632 A EP21703632 A EP 21703632A EP 4097785 A1 EP4097785 A1 EP 4097785A1
Authority
EP
European Patent Office
Prior art keywords
cell stack
chamber
laser
contact element
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21703632.6A
Other languages
German (de)
English (en)
Inventor
Alexander Breuer
Dennis Böhm
Frederik Grau
Markus Ramm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 AG filed Critical Volkswagen AG
Publication of EP4097785A1 publication Critical patent/EP4097785A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • 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
    • 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
    • H01M10/05—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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/38—Conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to a method for producing a component (e.g. for a (Li-ion) battery cell), comprising at least one cell stack for storing electrical energy and at least one contact element for making electrical contact with the at least one cell stack for storing electrical energy , a corresponding component and a device for producing a corresponding component.
  • a component e.g. for a (Li-ion) battery cell
  • the invention is used in particular in the production of lithium-ion batteries for, for example, electrified vehicles.
  • a casing for a battery module is known from DE 10 2016225 175 A1.
  • electrodes of mutually adjacent cell stacks are welded to one another in order to connect the neighboring cell stacks to one another to form a module.
  • a method for forming an encapsulated solid electrochemical component is known from EP 2 518 812 A2. Layers arranged on a vacuum plate are welded to one another by means of a laser along a circumference and cut to size.
  • a method for producing a component, a component and a device for producing a component are to be specified, which in particular can contribute at least to time savings and / or cost savings in the production of (lithium-ion) batteries.
  • a method for producing a component comprising at least one cell stack for storing electrical energy and at least one contact element for making electrical contact with the at least one cell stack for storing electrical energy, contributes to this, comprising at least the following steps: a) arranging at least part of the at least one Cell stack and the at least one contact element in a defined relative arrangement to one another in or on an evacuable chamber; b) evacuating at least part of the gas located in the chamber; c) connecting the at least one cell stack and the at least one contact element to one another to form an electrically conductive connection by means of at least one laser beam which is introduced into the chamber.
  • Steps a), b) and c) can be carried out at least once in the specified order.
  • at least steps a) and b) or b) and c) can also run at least partially in parallel.
  • the method can be carried out, for example, by means of a device described here.
  • the method is used in particular for Connecting a cell stack with at least one contact element (eg so-called "arrester") in a vacuum using a laser.
  • the welding of the so-called arrester to a cell stack (for a Li-ion cell) in negative pressure or vacuum by means of a laser is a particularly advantageous aspect of the method.
  • the combination of laser welding with the negative or vacuum conditions can in particular achieve the advantages that with the same laser power under negative pressure or vacuum the welding / "penetration" depth (with increasing negative pressure) can be increased and / or with the same welding / "penetration" depth under negative pressure or vacuum (with increasing negative pressure) less laser power can be used.
  • the method can advantageously contribute at least to time savings and / or cost savings and / or to the welding of larger component thicknesses in the production of lithium-ion batteries.
  • the component is suitable for storing electrical energy.
  • the component can be, for example, a component for a (rechargeable) lithium-ion battery.
  • the component can, for example, form a component for a (lithium ion) cell.
  • the component comprises at least at least one cell stack for storing electrical energy and at least one contact element for making electrical contact with the at least one cell stack.
  • the component can comprise a single cell stack.
  • the component can (precisely) comprise two contact elements.
  • the method generally serves to connect the at least one or two contact elements to the (in each case a single) cell stack in an electrically conductive manner, so that the at least one cell stack can be connected to a circuit via the contact element.
  • the contact elements can, for example, form electrical connections of the component or electrical connection elements of the component for connecting the component to components external to the component or to further components.
  • the contact element can be (directly) connected to an (electrode) flag of the cell stack.
  • at least two contact elements are provided, which are (directly) connected to (different-pole electrode) flags of the cell stack.
  • step a) at least part of the at least one cell stack and the at least one contact element are arranged in a defined relative arrangement to one another in or on an evacuable chamber.
  • the at least one cell stack and the at least one contact element can be provided in a defined manner in step a) Relative arrangement to one another take place in an evacuable chamber.
  • An arrangement or provision in the evacuable chamber is to be understood in particular to mean that the at least one cell stack and the at least one contact element are (completely) arranged within a space which is delimited by the chamber inner walls (which usually limit six sides).
  • An arrangement on the evacuable chamber can be designed, for example, in such a way that the chamber is arranged, for example, in the manner of a bell (specifically) over the area in which the connection between the cell stack and the contact element is to be formed.
  • the chamber is usually a negative pressure / vacuum chamber.
  • the chamber can be divided into a lower section and a lid.
  • the cover can be removed to insert the cell stack (s) and contact element (s).
  • the cover is usually reconnected to the lower section (gas-tight) before the laser beam is introduced.
  • a corresponding gas-tight connection can be interrupted locally, for example at one or two points along the circumference of the chamber, by vacuum connections via which the gas (with the lid closed) can be evacuated from the chamber.
  • the defined relative arrangement can for example be such that a contact element overlaps with at least one (electrode) flag of the at least one cell stack.
  • the arrangement of the component to be welded can for example be such that a contact element overlaps with at least one flag or the (homopolar) flags of at least one cell stack.
  • the defined relative arrangement can take place in such a way that a contact element is positioned below or above a flag or several (homopolar) flags of a cell stack.
  • the (laser weld) connection can be made in the corresponding overlap area. In other words, this means in particular that a weld seam can be formed in the overlap area.
  • the “flag” is usually a part of the cell stack that protrudes from one side of the cell stack for connection purposes.
  • the weld seam can be designed as an I-seam or as a fillet weld.
  • the "flags" and the arrester can be arranged in the butt joint.
  • the contact elements are usually also referred to as so-called “arresters” by those skilled in the art.
  • at least one laser weld seam is formed which (directly) materially connects an arrester with at least one (electrode) flag or several (homopolar) flags of a cell stack.
  • step b) at least part of the gas located in the chamber is evacuated.
  • the chamber can be evacuated until a predefined (negative) pressure or vacuum is present in the chamber.
  • the chamber can be evacuated evenly over its entire internal volume. Alternatively, it can be provided that the evacuation takes place in a targeted manner in the area or areas of the chamber in which the connection between the at least one cell stack and the at least one contact element is to take place.
  • gas can be pumped out of the chamber.
  • vacuum pumps can be used in a manner known in principle.
  • step c) the at least one cell stack and the at least one contact element are connected to one another to form an electrically conductive connection by means of at least one laser beam which is introduced into the chamber.
  • This relates in particular to an internal weld between at least one (electrode) tab of the cell stack and at least one conductor.
  • This can be differentiated, for example, from an external cell weld, which usually relates to the contacting of the finished cells with one another in a module and in which the cell arresters that protrude from the respective cell are usually connected to other cell arresters via a current collector rail or a bus connection be connected to each other.
  • at least one laser weld connection is formed between at least one contact element and at least one cell stack.
  • a weld seam formed in the process can run in a straight line and / or in one plane.
  • one weld seam can be used in each case to connect a contact element to one or the (homopolar) flags of a cell stack.
  • the number of weld seams can match the number of contact elements.
  • the connection is carried out in particular by means of a laser device which is suitable for welding aluminum-aluminum and / or copper-copper connections.
  • the laser device can be provided and set up for this purpose a (predominantly) aluminum-containing material (e.g. a contact element) with a (predominantly) aluminum-containing material (e.g. a flag) and / or a (predominantly) copper-containing material (e.g. a contact element) with a (predominantly) copper-containing material (e.g. a flag).
  • anode flags that predominantly contain copper can be connected to an anode arrester that contains mostly copper.
  • cathode flags that predominantly contain aluminum can be connected to a cathode arrester that predominantly contains aluminum become.
  • Corresponding material combinations can be present in lithium-ion batteries in particular.
  • one advantage of the negative pressure or vacuum can also consist in the fact that one or more lasers for a certain wavelength range (which may not be ideal for both materials - aluminum and copper -) are advantageous welds in both materials can perform.
  • the at least one cell stack is a cell stack for a lithium-ion cell.
  • Corresponding cells can find an advantageous application in the field of electrified vehicles.
  • the chamber be designed specifically for the component dimensions.
  • the chamber for example its inner volume and / or its inner contour
  • the chamber is adapted to the dimensions of a certain type or a certain type of component (for example characterized by at least its volume and / or its outer contour) is adapted.
  • the chamber can only be used for a certain type or a certain type of component, such as a cell stack (with a possible product carrier) of a certain size.
  • the internal volume of the chamber (in the loaded state) can be at least 60%, preferably at least 70% and particularly preferably at least 80% filled with the component.
  • the unusable “dead spaces” in the chamber are as small as possible.
  • Advantages that result from this are, among other things, that the sealing of the joining partners (for example: chamber base and cover) and / or to the negative pressure-forming components is simplified and / or the evacuation or ventilation times are significantly reduced until a necessary negative pressure is established and / or the Cleaning effort due to the settling of welding fumes, dusts and splashes can be made easier.
  • the smallest possible dead spaces advantageously mean that the chamber can be evacuated to such an extent (or to such a low negative pressure), even in a sufficiently short period for modern manufacturing processes, that sufficient welding depths can be generated with comparatively low laser power.
  • the at least one laser beam is an infrared laser beam.
  • Advantages of corresponding IR lasers are in particular that they are significantly cheaper than the currently available laser systems in the green or blue wavelength range and that the efficiency and / or the available powers of the IR laser sources are better.
  • a disadvantageous number of spatter and discontinuities in the weld seam could be observed.
  • the vacuum that can be achieved here as easily as possible or the low negative pressure that can be achieved as easily as possible, the weld spatter and weld seam imperfections could advantageously be minimized.
  • the at least one laser beam enter the chamber through at least one laser beam entry glass.
  • the number of laser beam entry glasses corresponds to the number of weld seams to be produced and / or the number of laser devices present.
  • the at least one laser beam entry glass can be let into an (upper) chamber wall and / or a cover of the chamber.
  • the at least one laser beam entry glass also advantageously contributes to reducing the dead spaces, since the laser source can thus be arranged outside the chamber.
  • At least two contact elements be connected to a cell stack by means of laser beams that act at least partially in parallel or simultaneously.
  • at least two laser devices and possibly two laser beam entry glasses can be provided. This can contribute to the fact that at least two weld seams of the component can be produced at least partially in parallel or at the same time, which can advantageously contribute to reducing the production time.
  • At least two contact elements be connected to a cell stack by means of laser beams acting one after the other.
  • only one (single) laser device can be sufficient for connecting the cell stack to the contact elements.
  • the laser device can, for example, be or can be moved relative to the chamber and / or the chamber relative to the laser device.
  • a rotating device can rotate the chamber relative to the laser device.
  • the rotary device can rotate the chamber and the laser device relative to one another, so that the laser device is positioned in one end position of the rotary movement above one of the laser beam entry glasses and in a further end position of the rotary movement above another of the laser beam entry glasses.
  • At least one protective device is used to protect the environment from the at least one laser beam.
  • the protective device can, for example, be a laser protection chamber and / or a local encapsulation.
  • the laser protection chamber is formed in particular with a housing which preferably completely surrounds the chamber and / or the laser device (s).
  • the local encapsulation can be set up and arranged to locally surround or shield the path of the laser beam from the laser device to the chamber.
  • the number of local encapsulations can correspond to the number of laser devices and / or the number of laser beam entry glasses.
  • the encapsulation can be moved towards and away from the chamber, for example with the laser device.
  • a sensory device can be provided which recognizes whether the encapsulation is present and does not release the laser until the encapsulation has been recognized.
  • a chamber can be provided which is repeatedly or repeatedly equipped with a component.
  • the chamber can be assigned to at least one laser device (fixed) and / or integrated in an arrangement with at least one laser device (fixed) or remain there permanently.
  • several chambers can be provided which are each equipped with a component and are arranged one after the other in a specific relation to at least one laser device for the purpose of connecting the cell stack to the at least one contact element.
  • a component comprising at least one cell stack for storing electrical energy and at least one contact element for making electrical contact with the at least one cell stack for storing electrical energy
  • the at least one cell stack and the at least one contact element are by means of a reduced Ambient pressure generated laser welded connection are connected to one another in an electrically conductive manner.
  • Advantageous properties of the welded connection produced in this way are, in particular, a reduced number and / or size of pores and / or finer scaling and / or a finer design of the vapor capillary (compared to a welded connection under ambient pressure).
  • Another advantage of the welded connection produced in this way can be seen in the uniformity of the process, which can advantageously contribute to the formation of the vapor capillary that is as homogeneous as possible.
  • a device for producing a component comprising at least one cell stack for storing electrical energy and at least a contact element for making electrical contact with the at least one cell stack, proposed for storing electrical energy, comprising:
  • At least one laser device by means of which at least one laser beam for connecting the at least one cell stack and the at least one contact element to one another can be introduced into the chamber to form an electrically conductive connection.
  • the device can be provided and set up, for example, to carry out a method described here and / or to manufacture a component described here.
  • the evacuation device can comprise at least one vacuum or negative pressure connection of the chamber and / or at least one vacuum pump.
  • the holding device can comprise at least one receptacle for the at least one cell stack or for a goods carrier that carries the at least one cell stack. Furthermore, the holding device can comprise at least one support for the at least one contact element.
  • the laser device can comprise at least one laser source, in particular an infrared laser source.
  • Fig. 2 the device from Fig. 1 in plan view
  • FIG. 5 shows a further example of a device described here for producing a
  • FIG. 7 shows a further example of a device described here for producing a
  • Fig. 1 shows schematically an example of a device described here for producing a component 1 in a sectional side view.
  • the component 1 is used to store electrical energy and here comprises, for example, a cell stack 2 for storing electrical energy and two contact elements 3 for making electrical contact with the cell stack 2.
  • the cell stack 2 and the contact elements 3 are each made by means of a laser welded connection or welded joint produced under reduced ambient pressure. Laser weld seam 13 connected to one another in an electrically conductive manner.
  • the device for producing the component 1 comprises an evacuable chamber 4, at least one evacuation device that can be connected to the chamber 4 (here indicated by the two negative pressure connections 6), by means of which at least part of the gas in the chamber 4 can be evacuated, at least one holding device.
  • Device 7 by means of which at least a part of the at least one cell stack 2, which is in turn provided in a goods carrier 19, and the at least one contact element 3 in a defined relative arrangement to one another in or on the chamber 4, at least one laser device 8, by means of which at least one laser beam 5 for connecting the at least one cell stack 2 and the at least one contact element 3 to one another to form an electrically conductive connection can be introduced into the chamber 4 is.
  • the cell stack 2 In the goods carrier 19, the cell stack 2 can be transported in and away from the stacking process for welding and, if necessary, transferred to the further process steps.
  • the device is in particular a welding device in which the storage of a Li-ion cell stack 2 including the stack carrier and the contact element 3 (arrester) to be welded to the stack takes place.
  • welds can be carried out under reduced atmospheric pressure or in a vacuum in order to contact the arresters to the stack.
  • the at least one cell stack 2 is here, for example, a cell stack for a lithium-ion cell.
  • the cell stack comprises on two opposite sides (electrodes with different poles) tabs 13 which protrude from the cell stack 2 for the electrical connection of the latter.
  • the cell stack 2 is connected to the contact elements 3.
  • a contact element 3 can be held above or below the flags 13 on one side and connected to the flags in this relative arrangement.
  • the corresponding electrically conductive connection is indicated by way of example in FIG. 1 with the weld seams 13.
  • the contact elements 3 are used to electrically connect the cell stack 2 to an electric circuit, for example.
  • the flags 12 on each side can be provided with a flag tensioner 14.
  • the evacuation device 6 comprises (in addition to the negative pressure connections 6) as a rule at least one vacuum pump (not shown here), which can be connected to the space in the chamber via the negative pressure connections 6.
  • the holding device 7 here has, for example, two supports 15 (so-called arrester support device) for arranging the contact elements 3 in a defined position and a receptacle 16 (so-called stack carrier receptacle) for arranging the (in the goods carrier 19 held) cell stack 2 in a defined position.
  • the cell stack 2 and the contact elements 3 can be inserted together or separately.
  • the contact elements 3 can already be attached to the cell stack 2.
  • the cell stack 2 (including flags 12) and the contact elements 3 can be inserted into the device together become.
  • the holding device 7 can in particular be formed in such a way that the joining partners (flags 12 and contact elements 3) are arranged opposite the laser beam 5 in such a way that the laser beam 5 occurs first or (either) on the contact element 3 (arrester) or on a flag 12 is coupled into component 1.
  • the chamber 4 is formed here, for example, in a component-specific manner.
  • the chamber 4 is formed here, for example, in the form of a negative pressure / vacuum laser chamber, which is only slightly larger than the volume of the component 1, including the cell stack 2 and contact elements 3 (arrester), the goods carrier 19 and the holding device 7 (in particular the Support device of the arrester).
  • a correspondingly small volume can be achieved in that the chamber 4 is adapted to a specific type of cell stack 2 or a specific cell stack size and does not have to be suitable for a large number of different cell stacks.
  • This keeps the evacuation time of the laser chamber as short as possible, since the “dead space” that has to be evacuated is minimized. This advantageously saves manufacturing time in the cell manufacturing process.
  • the process costs can be advantageously reduced due to the reduced cycle time for the formation of the negative pressure.
  • the at least one laser beam 5 is in each case an infrared laser beam.
  • two laser devices 8 are provided in FIG. 1, which may also be referred to as so-called laser optics (or “scanners”).
  • Each of the two laser beams 5 can enter the chamber 4 through one of two laser beam entry glasses 9, for example. So that the laser beams 5 can radiate into the chamber 4 in a targeted manner, the laser beam entry glasses 9 are advantageously let into a chamber wall (and / or a chamber cover) in the area in which the welds are to take place.
  • a protective device 10 for protecting the environment from the at least one laser beam 5 a protective device 10 in the form of a laser protection chamber is used in the exemplary device according to FIG. 1. This here, for example, encapsulates the (entire) chamber 4 and possibly also the laser devices 8.
  • two contact elements 3 can be connected to a cell stack 2 by means of laser beams 5 which act at least partially in parallel or at the same time.
  • the two weld seams 13 can be produced at the same time. This can advantageously save time in the cell production process.
  • the second laser device 8 higher system costs arise. In other words, this can also be described in such a way that the irradiation of the laser for welding on the anode and cathode side can be carried out simultaneously by two lasers.
  • FIG. 2 schematically shows the device from FIG. 1 in plan view.
  • the weld seams 13 are formed below the laser beam entry glasses 9.
  • the chamber 4 can be formed at the top with a cover 17 or can be delimited by this.
  • FIG. 3 shows schematically the device from FIG. 1 in a sectional plan view.
  • the cover 17 is removed.
  • the view from above onto the entire component 1 is free.
  • FIGS. 1 to 3 schematically shows a further example of a device described here for producing a component 1 in a sectional side view.
  • the reference symbols are used uniformly, so that the differences to the example from FIGS. 1 to 3 will be discussed below in particular.
  • the device according to FIG. 4 has only one laser device 8.
  • the two contact elements 3 are connected to a cell stack 2, for example, by means of laser beams 5 acting one after the other.
  • a rotating device 18 is provided, by means of which the chamber 4 and the laser device 8 can be rotated relative to one another so that the laser device 8 is in an end position of the rotary movement above one of the laser beam entry glasses 9 and is positioned over another of the laser beam entry glasses 9 in a further end position of the rotary movement.
  • this can also be described in such a way that the irradiation of the laser for welding on the anode and cathode side can take place by moving the side to be welded by a rotary table.
  • FIG. 5 schematically shows a further example of a device described here for producing a component 1 in a sectional side view.
  • the reference symbols are used uniformly, so that the differences to the example from FIGS. 1 to 3 will be discussed below in particular.
  • the principle of rotating the component from FIG. 4 can also be advantageously combined with the principle of the encapsulation from FIG. 5.
  • a protective device 11 in the form of local encapsulation is used (instead of the laser protection chamber), which is arranged between the laser devices 8 and the laser beam entry glasses 9.
  • the aim of the protective device 11 is to locally encapsulate the free space usually remaining between the laser device 8 and the (negative pressure / vacuum) chamber 4.
  • the free space is encapsulated in particular to control or contain the free laser radiation for safety reasons. If the entire unit consisting of laser device 8 and chamber 4 cannot or should not be enclosed (cf. protective device 10 in FIGS. 1 to 4), the free space between laser device 8 and chamber 4 can, for example, be Protective device 11 are closed in the form of local encapsulation. This locking mechanism is referred to in the following as “encapsulation”.
  • FIG. 6 shows schematically an illustration of a possible working step of the device from FIG Placing the encapsulation on the laser device 8 and / or the chamber 4 is achieved.
  • FIG. 6 illustrates a possible infeed movement after the encapsulation has been placed on the respective laser device 8.
  • a common infeed movement or separate infeed movements of the laser devices 8 are possible.
  • FIG. 7 schematically shows a further example of a device described here for producing a component 1 in a sectional side view (upper illustration in FIG. 7) and top view (lower illustration in FIG. 7).
  • the reference symbols are used uniformly, so that the differences to the example from the previous figures are mainly discussed below.
  • 7 illustrates by way of example that it may be sufficient if (only) a part of the at least one cell stack 2 and the at least one contact element 3 are arranged in a defined relative arrangement to one another in the chamber 4. As a rule, the area in which the connection is to be created is surrounded by the chamber 4.
  • FIG. 7 shows various possibilities for realizing the example on the left-hand side and on the right-hand side.
  • FIG. 8 schematically shows a further example of a device described here for producing a component in a sectional side view (upper illustration in FIG. 8) and top view (lower illustration in FIG. 8).
  • the reference symbols are used uniformly, so that in the following, the differences to the example from the previous figures are mainly discussed.
  • 8 illustrates by way of example that at least part of the at least one cell stack 2 and the at least one contact element 3 can be arranged on the chamber 4 in a defined relative arrangement to one another.
  • the cell stack 2 and the at least one contact element 3 can, for example, form a type of floor of the chamber 4, it possibly being sufficient, as shown in FIG occurs, is in direct contact with the remaining part of the chamber 4 formed, for example, in the manner of a bell.
  • the chamber 4 can, for example, remain permanently positioned in a laser system and be repeatedly (or repeatedly) equipped with components 1.
  • One advantage of this concept is that the setup process only needs to be carried out once.
  • several chambers 4 can be used per laser system.
  • several chambers 4 can be used in a circulating operation.
  • the loading of the chamber with the component 1 can take place outside the laser system.
  • the chamber 4 can be closed and / or evacuated outside the laser system. This can advantageously save process time in the laser system.
  • a method for producing a component, a component and a device for producing a component can be specified which at least partially solve the problems described in connection with the prior art.
  • a method for producing a component, a component and a device for producing a component are specified, which in particular can contribute at least to time savings and / or cost savings in the production of (lithium-ion) batteries.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un composant (1) comprenant au moins un empilement d'éléments (2) pour stocker de l'énergie électrique et au moins un élément de contact (3) pour la mise en contact électrique du ou des empilements d'éléments (2) servant à stocker de l'énergie électrique, ledit procédé étant caractérisé par au moins les étapes suivantes : a) agencement d'au moins une partie du ou des empilements d'éléments (2) et du ou des éléments de contact (3) selon une disposition relative définie les uns par rapport aux autres dans ou au niveau d'une chambre (4) dans laquelle le vide peut être fait ; b) évacuation d'au moins une partie du gaz présent dans la chambre (4) ; c) connexion du ou des empilements d'éléments (2) et du ou des éléments de contact (3) entre eux pour établir une liaison électriquement conductrice au moyen d'au moins un faisceau laser (5) qui est introduit dans la chambre (4).
EP21703632.6A 2020-01-30 2021-01-29 Connexion d'un empilement d'éléments avec au moins un élément de contact, sous vide au moyen d'un laser Pending EP4097785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020102317.0A DE102020102317A1 (de) 2020-01-30 2020-01-30 Verbinden eines Zellstapels mit mindestens einem Kontaktelement im Vakuum mittels Laser
PCT/EP2021/052090 WO2021152080A1 (fr) 2020-01-30 2021-01-29 Connexion d'un empilement d'éléments avec au moins un élément de contact, sous vide au moyen d'un laser

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EP4097785A1 true EP4097785A1 (fr) 2022-12-07

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US (1) US20230078332A1 (fr)
EP (1) EP4097785A1 (fr)
CN (1) CN115004430A (fr)
DE (1) DE102020102317A1 (fr)
WO (1) WO2021152080A1 (fr)

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DE102021108104A1 (de) * 2021-03-30 2022-10-06 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung eines Bauteils für eine Batteriezelle sowie ein solches Bauteil

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US5096518A (en) 1989-02-22 1992-03-17 Kabushiki Kaisha Kobe Seiko Sho Method for encapsulating material to be processed by hot or warm isostatic pressing
US6884541B2 (en) 2000-02-09 2005-04-26 Ngk Insulators, Ltd. Lithium secondary battery and manufacturing method thereof
JP2011170972A (ja) * 2008-06-17 2011-09-01 Panasonic Corp 二次電池の製造方法
DE102009035496A1 (de) 2009-07-31 2011-02-03 Daimler Ag Verfahren zum Herstellen einer bipolaren Rahmenflachzelle
US20120276435A1 (en) 2011-04-26 2012-11-01 Eaglepicher Technologies, Llc Method of forming encapsulated solid electrochemical component
DE102012213110B4 (de) 2012-07-26 2016-12-01 Leichtbau-Zentrum Sachsen Gmbh Verfahren zur Herstellung einer Folienbatterie, Verfahren zur Vorbereitung eines Folienstapels sowie Lithium-Ionen-Batterieelement
DE102016225175A1 (de) 2016-12-15 2018-06-21 Robert Bosch Gmbh Umhüllung für ein Batteriemodul
US10944096B2 (en) 2018-04-10 2021-03-09 GM Global Technology Operations LLC Method of manufacturing a lithium metal negative electrode
US10919112B2 (en) 2018-04-30 2021-02-16 GM Global Technology Operations LLC Method and system for manufacturing a lithium metal negative electrode
DE102019102233A1 (de) 2018-12-20 2020-06-25 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung eines Bauteilverbunds sowie Kraftfahrzeug
CN109483055B (zh) * 2018-12-28 2024-04-26 江苏正力新能电池技术有限公司 一种电芯连接片焊接机构及其焊接方法

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US20230078332A1 (en) 2023-03-16
CN115004430A (zh) 2022-09-02
DE102020102317A1 (de) 2021-08-05
WO2021152080A1 (fr) 2021-08-05

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