WO2024056266A1 - Battery device and vehicle component comprising same - Google Patents

Battery device and vehicle component comprising same Download PDF

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Publication number
WO2024056266A1
WO2024056266A1 PCT/EP2023/071164 EP2023071164W WO2024056266A1 WO 2024056266 A1 WO2024056266 A1 WO 2024056266A1 EP 2023071164 W EP2023071164 W EP 2023071164W WO 2024056266 A1 WO2024056266 A1 WO 2024056266A1
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WO
WIPO (PCT)
Prior art keywords
individual
battery device
battery
layer
contact
Prior art date
Application number
PCT/EP2023/071164
Other languages
German (de)
French (fr)
Inventor
Julius Aktas
Jochen Eppinger
Dragos-Cristian Iancu
Thomas KALMBACH
Jessica Kansy
Christian Kern
Oleksandr Pavlov
Eduard Reimer
Dieter Reisinger
Karl-Ulrich Schmid-Walderich
Original Assignee
Mahle International Gmbh
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 Mahle International Gmbh filed Critical Mahle International Gmbh
Publication of WO2024056266A1 publication Critical patent/WO2024056266A1/en

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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
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals

Definitions

  • the invention relates to a battery device according to the subject matter of claim 1.
  • the invention further relates to a vehicle component with at least one such battery device.
  • Battery devices have individual battery cells designed to store electrical energy, which have electrically conductive contact tabs for their electrical contacting.
  • the contact lugs of the individual battery cells are each individually guided through a cell carrier, folded over and held down, with an electrically conductive cell connector of the battery device then being arranged on the contact lugs.
  • the contact tabs are materially connected to the cell connector by welding. The applicant's experiments have shown that the contact tabs and/or the cell connector can completely melt due to the thermal energy introduced into the material during the welding process, which makes them unusable for making electrical contact.
  • the object of the invention is therefore to provide an improved or at least a different embodiment of a battery device.
  • the implementation of electrical contacting of the individual battery cells by welding should become more reliable.
  • a vehicle component with at least one such battery device should be specified.
  • a battery device designed to store electrical energy which is equipped with, in particular, rechargeable individual battery cells, in particular pouch cells, which have electrically conductive contact tabs for their electrical contacting.
  • the contact tab of at least one individual battery cell is placed or folded in a multi-layer fold made of individual layers arranged flat on top of one another.
  • the multi-layer fold can, for example, have at least two or more individual layers.
  • the individual layers can in particular be designed to be coherent.
  • the individual layers of the multi-layer fold and an electrically conductive connector of the battery device are connected to one another in a materially bonded manner using a connecting seam created by welding, ie as part of a welding process.
  • This provides an advantageous electrical contact between the at least one individual battery cell and the electrically conductive connector, with the welding process being used to realize the electrical contacting can be carried out comparatively reliably.
  • this is due to the fact that the multi-layer folding of the contact lug has a material thickness that is relatively large compared to the material thickness of the unfolded contact lug and can be easily adjusted by varying the number of individual layers.
  • the thermal energy introduced into the contact lug material during the implementation of the electrical contact by welding is sufficient for the local melting of the contact lug and the connector and thus for the planned production of the connecting seam, but there is no longer any risk of the contact lug and/or the connector completely melting is at least reduced.
  • the invention understands an electrically conductive contact tab of a single battery cell to be a flat and possibly strip-shaped flat body made of metallic material, which can be, for example, a sheet metal strip.
  • the contact lug or the flat body of the contact lug is expediently designed to be ductilely foldable transversely to its main extent, i.e. in particular ductilely bendable, so that a multi-layer fold can be produced relatively easily by bending the contact lug once or several times.
  • the contact lug or its contact lug material is expediently suitable for welding. I.e. it is selected so that a cohesive connection with an electrically conductive connector, in particular another contact lug or a cell connector plate, can be realized. It can also be provided that the contact lug or the flat body of the contact lug has a rectangular cross section or another comparable flat body cross section.
  • said connector is formed by a contact lug of another individual battery cell.
  • the contact lugs are of the individual battery cells involved are directly connected to one another, i.e. without an intermediate element.
  • the contact lug of the further single battery cell for example immediately adjacent to the said single battery cell, or a specially designed connecting section of the contact lug of this single battery cell is guided to the multi-layer folding of the contact lug of the single battery cell, placed there in contact and then materially connected to it by welding .
  • the battery device can thereby be manufactured relatively inexpensively, since the number of individual components to be provided is relatively small, and can be constructed in a relatively lightweight manner, since the small number of individual components can result in a low overall weight.
  • said connector is formed by a cell connector plate made of metallic material.
  • the cell connector plate can be arranged on the multi-layer fold of the individual battery cell and connected to it in a materially bonded manner by welding.
  • the multi-layer fold of the individual battery cell is arranged in direct contact with the cell connector plate.
  • the cell connector plate is expediently formed by a mechanically rigid flat body, which can be arranged in particular on a cell carrier of the battery device.
  • the multi-layer fold has at least two or more individual layers arranged flat on top of each other.
  • the resulting material thickness of the multi-layer fold can be adjusted relatively easily, so that the welding process used can also be adapted to changing boundary conditions and then carried out reliably.
  • the multi-layer folding may be necessary if the contact tabs of the individual battery cells are made from a different metallic material or are provided with a different material thickness or if the connector in question is formed by a cell connector plate instead of a contact tab.
  • the multi-layer fold is formed on a free tab end of the contact tab of the individual battery cell or forms the same.
  • the unfolded contact tab of the individual battery cell has a free tab end which projects away from the cell body of the individual battery cell and which is folded over one or more times to realize the multi-layer folding. Folding over can be understood in the sense of folding around.
  • the contact tab of the individual battery cell is folded over in such a way that a first individual layer of the multi-layer fold, which forms a free tab end of the unfolded contact tab, is cohesively connected to a second individual layer of the multi-layer fold via a folded edge region.
  • the first individual layer is preferably folded over with respect to the second individual layer in such a way that it is supported flat on a large area of the second individual layer facing or away from a cell body of the individual battery cell.
  • the first individual layer or the second individual layer of the multi-layer fold is fixed or at least supported on a contact surface of a cell carrier of the battery device that faces away from the individual battery cells. This provides an advantageous multi-layer fold made up of two individual layers that can be provided relatively inexpensively and can optionally be fixed to a cell carrier of the battery device.
  • the contact tab or its multi-layer folding is fixed via the first individual layer to said cell carrier of the battery device or at least supported on it.
  • the contact tab or its multi-layer fold is immovable relative to the cell carrier or at least immovable in the direction of the cell carrier in a working axis perpendicular to the cell carrier.
  • a welding process for realizing electrical contacting of the individual battery cell can be carried out relatively simply and reliably.
  • the first individual layer is arranged on the large area of the second individual layer facing away from the cell body of the individual battery cell, which is also referred to as the second large area, it can be provided that the contact tab or its multi-layer fold is fixed to the cell carrier of the battery device via the second individual layer or at least supported, which also results in an advantageous fixation of the contact tab or its multi-layer fold on the cell carrier or at least an immobility relative to the cell carrier in a working axis perpendicular to the cell carrier in the direction of the cell carrier.
  • the contact tab is L-shaped.
  • a correspondingly L-shaped contact flag expediently has a flag base arranged directly on a cell body of the individual battery cell and individual layers folded at an angle or right angles with respect to the flag base.
  • the connecting seam is produced by laser welding. This makes it possible to create a particularly cost-effective and at the same time mechanically robust electrical contact. the.
  • the invention is not limited to laser welding processes; other welding processes can also be used and the same advantages can be achieved.
  • Another basic idea of the invention is to provide an advantageous vehicle component. This is solved by a vehicle component, in particular a vehicle battery system, further in particular a vehicle traction battery system, which has at least one battery device according to the previous description.
  • the present invention expediently relates to a battery device with individual battery cells, in particular pouch cells, which are electrically conductively connected to one another and have electrically conductive contact tabs to form the electrical contact. It is essential for the invention that at least one such contact tab is placed in a multi-layer fold made up of, for example, at least two coherent individual layers arranged flat on top of each other, which are connected to one another by welding and to an electrically conductive connector of the battery device.
  • the invention relates in particular to a vehicle component with at least one such battery device.
  • 1 is a sectional view of a battery device
  • FIG. 2 shows a section of the battery device from FIG. 1,
  • Fig. 3 is a perspective view of a cell carrier of the battery device from Fig. 1.
  • FIG. 1 to 3 show an embodiment of a battery device, designated overall by reference number 1, which is set up to store electrical energy and is preferably used in a vehicle component, in particular a vehicle traction battery system of a vehicle.
  • the battery device 1 has a large number of rechargeable individual battery cells 2, 3 arranged one behind the other on a straight stacking path 20, which are implemented purely as an example by pouch cells.
  • the individual battery cells 2, 3 each have a cell body 15, which are each held in a separate slot in a housing-like cell carrier 18.
  • the individual battery cells 2, 3 also have an electrically conductive contact lug 4, 5 which projects away from the respective cell body 15 to a slot opening, by means of which a respective individual battery cell 2, 3 can be electrically contacted.
  • the contact flags 4, 5 are realized, purely as an example, by a strip-shaped flat body made of metallic material that is flat in the unfolded state and can be ductilely folded, ie in particular bendable, so that they can be folded or bent relatively easily and, if necessary, with relatively little effort.
  • the section of a contact lug 4, 5 located directly on a cell body 15 of an individual battery cell 2, 3 is understood in the present case as the lug base 13 of an individual battery cell 2, 3, while a section adjoining the lug base 13 on a side of the lug base 13 facing away from the cell body 15 a contact lug 4, 5 is referred to as a free lug end 12 of a contact lug 4, 5 of a single battery cell 2, 3.
  • the unfolded contact lugs 4, 5 are inserted through the slot opening of a slot and their free lug ends 12 are each placed in a multi-layer fold 6 made up of, for example, two contiguous individual layers 7, 8 arranged flat on top of each other or be folded.
  • the individual layers 7, 8 are integrally connected in such a way that a first individual layer 7 of the respective multi-layer fold 6, which forms a free flag end 12 of the unfolded contact flag 4, 5, is cohesively connected to a second individual layer 8 of the respective multi-layer fold 6 via a folded edge region 14 , which can be seen in particular in FIGS. 1 and 2.
  • first individual layer 7 is folded over with respect to the second individual layer 8 in such a way that it is supported flatly on a first large surface 16 of the second individual layer 8 facing the cell body 15 and that the individual layers 7, 8 with respect to the respective flag base 13 are folded at an angle or preferably at a right angle on a further folding edge area 22 opposite the folding edge area 14, so that an approximately L-shaped shape of the contact tabs 4, 5 results when viewed from the side.
  • an effective range, for example a thermal influence range, of the laser beam used in the laser welding process is indicated by a dashed frame 21. This provides electrical contacting of the individual battery cells 2, 3, with the multi-layer folds 6 allowing the welding process to be carried out comparatively reliably.
  • the contact tabs 4, 5 are fixed via their first individual layers 7 on flat contact surfaces 19 of the cell carrier 18 facing away from the cell bodies 15 or are at least supported on the same.
  • the contact tabs 4, 5 or their multi-layer folds 6 are immovable relative to the cell carrier 18 or at least in a vertical position on the contact surface. before 19 of the cell carrier 18 standing working axis in the direction of the cell carrier 18 is kept immobile, which advantageously allows the welding process to be carried out even more reliably.

Abstract

The present invention relates to a battery device (1) comprising individual battery cells (2, 3), in particular pouch cells, which are connected together in an electrically conductive manner and have electrically conductive contact lugs (4, 5) for producing the electrical contact. It is essential to the invention that at least one such contact lug (4, 5) is placed in a multilayer fold (6) made of contiguous individual layers (7, 8) which are arranged flat on top of one another and are integrally connected, by welding, to one another and to an electrically conductive connector (9) of the battery device (1). The invention also relates to a vehicle component comprising at least one such battery device (1).

Description

Batterievorrichtung sowie Fahrzeugbauteil mit derselben Battery device and vehicle component with the same
Die Erfindung betrifft eine Batterievorrichtung nach dem Gegenstand des Anspruchs 1 . Die Erfindung betrifft ferner ein Fahrzeugbauteil mit mindestens einer solchen Batterievorrichtung. The invention relates to a battery device according to the subject matter of claim 1. The invention further relates to a vehicle component with at least one such battery device.
Batterievorrichtungen weisen zur Speicherung von elektrischer Energie eingerichtete Einzelbatteriezellen auf, die zu ihrer elektrischen Kontaktierung elektrisch leitfähige Kontaktfahnen besitzen. Zur Realisierung von entsprechenden Kontaktierungen ist seither vorgesehen, dass die Kontaktfahnen der Einzelbatteriezellen jeweils einzeln durch einen Zellträger geführt, umgefalzt und niedergehalten werden, wobei dann ein elektrisch leitfähiger Zellverbinder der Batterievorrichtung auf den Kontaktfahnen angeordnet wird. In einem sich daran anschließenden Fügeschritt werden die Kontaktfahnen mit dem Zellverbinder durch Schweißen stoffschlüssig verbunden. Bei Versuchen der Anmelderin hat sich herausgestellt, dass die Kontaktfahnen und/oder der Zellverbinder durch die beim Schweißvorgang in das Material eingebrachte thermische Energie vollständig aufschmelzen können, was dieselben zur Realisierung einer elektrischen Kontaktierung unbrauchbar macht. Battery devices have individual battery cells designed to store electrical energy, which have electrically conductive contact tabs for their electrical contacting. In order to realize corresponding contacts, it has since been provided that the contact lugs of the individual battery cells are each individually guided through a cell carrier, folded over and held down, with an electrically conductive cell connector of the battery device then being arranged on the contact lugs. In a subsequent joining step, the contact tabs are materially connected to the cell connector by welding. The applicant's experiments have shown that the contact tabs and/or the cell connector can completely melt due to the thermal energy introduced into the material during the welding process, which makes them unusable for making electrical contact.
Die Aufgabe der Erfindung liegt daher darin, eine verbesserte oder zumindest eine andere Ausführungsform einer Batterievorrichtung bereitzustellen. Insbesondere soll die Realisierung einer elektrischen Kontaktierung der Einzelbatteriezellen durch Schweißen zuverlässiger werden. Weiterhin soll ein Fahrzeugbauteil mit mindestens einer solchen Batterievorrichtung angegeben werden. The object of the invention is therefore to provide an improved or at least a different embodiment of a battery device. In particular, the implementation of electrical contacting of the individual battery cells by welding should become more reliable. Furthermore, a vehicle component with at least one such battery device should be specified.
Bei der vorliegenden Erfindung wird diese Aufgabe insbesondere durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche und der Beschreibung. Die Erfindung beruht auf der Überlegung, dass die Gefahr des vollständigen Aufschmelzens einer Kontaktfahne im Rahmen eines Schweißvorgangs von der beim Schweißen in das Kontaktfahnenmatenal eingebrachten thermischen Energie einerseits und von der Materialdicke der Kontaktfahne andererseits abhängig ist. Hieraus resultiert die Erkenntnis, dass die Realisierung einer elektrischen Kontaktierung der Einzelbatteriezellen durch Schweißen zuverlässiger gemacht werden kann, indem man die Kontaktfahnen der Einzelbatteriezellen zwei- oder mehrfach faltet und die dadurch realisierten Mehrlagenfaltungen mit einem elektrisch leitfähigen Verbinder der Batterievorrichtung durch Schweißen stoffschlüssig verbindet. Die vergleichsweise große Materialdicke einer jeweiligen Mehrlagenfaltung verhindert oder vermindert dabei die Gefahr des vollständigen Aufschmelzens der Kontaktfahne im Rahmen eines Schweißvorgangs. In the present invention, this object is achieved in particular by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims and the description. The invention is based on the consideration that the risk of a contact lug completely melting during a welding process depends on the thermal energy introduced into the contact lug material during welding on the one hand and on the material thickness of the contact lug on the other hand. This results in the finding that the realization of electrical contacting of the individual battery cells by welding can be made more reliable by folding the contact tabs of the individual battery cells two or more times and connecting the multi-layer folds thus realized to an electrically conductive connector of the battery device by welding. The comparatively large material thickness of a respective multi-layer fold prevents or reduces the risk of the contact tab completely melting during a welding process.
Demnach wird konkret eine zur Speicherung von elektrischer Energie eingerichtete Batterievorrichtung vorgeschlagen, die mit insbesondere wiederaufladbaren Einzelbatteriezellen, insbesondere Pouchzellen, ausgestattet ist, die zu ihrer elektrischen Kontaktierung elektrisch leitfähige Kontaktfahnen aufweisen. Wesentlich für die Erfindung ist, dass die Kontaktfahne zumindest einer Einzelbatteriezelle in eine Mehrlagenfaltung aus flächig aufeinander angeordneten Einzellagen gelegt oder gefaltet ist. Die Mehrlagenfaltung kann beispielsweise zumindest zwei oder mehr Einzellagen aufweisen. Die Einzellagen können insbesondere zusammenhängend ausgebildet sein. Zur Realisierung der elektrischen Kontaktierung der zumindest einen Einzelbatteriezelle sind die Einzellagen der Mehrlagenfaltung und ein elektrisch leitfähiger Verbinder der Batterievorrichtung anhand einer durch Schweißen, d.h. im Rahmen eines Schweißvorgangs, erzeugten Verbindungsnaht stoffschlüssig miteinander verbunden. Dadurch ist eine vorteilhafte elektrische Kontaktierung zwischen der zumindest einen Einzelbatteriezelle sowie dem elektrisch leitfähigen Verbinder bereitgestellt, wobei der Schweißvorgang zur Realisierung der elektrischen Kontaktierung vergleichsweise zuverlässig ausführbar ist. Dies liegt, wie vorstehend erwähnt, darin begründet, dass die Mehrlagenfaltung der Kontaktfahne eine im Vergleich zur Materialdicke der ungefalteten Kontaktfahne relativ große und durch Variation der Anzahl der Einzellagen leicht einstellbare Materialdicke besitzt. Dadurch genügt die bei der Realisierung der elektrischen Kontaktierung durch Schweißen in das Kontaktfahnenmaterial eingebrachte thermische Energie zum lokalen Aufschmelzen der Kontaktfahne und des Verbinders und damit zur planmäßigen Erzeugung der Verbindungsnaht, die Gefahr des vollständigen Aufschmelzens der Kontaktfahne und/oder des Verbinders besteht jedoch nicht mehr oder ist zumindest reduziert. Accordingly, a battery device designed to store electrical energy is specifically proposed, which is equipped with, in particular, rechargeable individual battery cells, in particular pouch cells, which have electrically conductive contact tabs for their electrical contacting. It is essential for the invention that the contact tab of at least one individual battery cell is placed or folded in a multi-layer fold made of individual layers arranged flat on top of one another. The multi-layer fold can, for example, have at least two or more individual layers. The individual layers can in particular be designed to be coherent. To realize the electrical contacting of the at least one individual battery cell, the individual layers of the multi-layer fold and an electrically conductive connector of the battery device are connected to one another in a materially bonded manner using a connecting seam created by welding, ie as part of a welding process. This provides an advantageous electrical contact between the at least one individual battery cell and the electrically conductive connector, with the welding process being used to realize the electrical contacting can be carried out comparatively reliably. As mentioned above, this is due to the fact that the multi-layer folding of the contact lug has a material thickness that is relatively large compared to the material thickness of the unfolded contact lug and can be easily adjusted by varying the number of individual layers. As a result, the thermal energy introduced into the contact lug material during the implementation of the electrical contact by welding is sufficient for the local melting of the contact lug and the connector and thus for the planned production of the connecting seam, but there is no longer any risk of the contact lug and/or the connector completely melting is at least reduced.
Die Erfindung versteht unter einer elektrisch leitfähigen Kontaktfahne einer Einzelbatteriezelle zweckmäßigerweise einen ebenen und gegebenenfalls streifenförmigen Flachkörper aus metallischem Material, wobei es sich beispielsweise um einen Blechstreifen handeln kann. Die Kontaktfahne oder der Flachkörper der Kontaktfahne ist zweckmäßigerweise quer zu seiner Hauptausdehnung duktil faltbar, d.h. insbesondere duktil biegbar, gestaltet, sodass eine Mehrlagenfaltung sich relativ einfach durch ein- oder mehrfaches Umbiegen der Kontaktfahne erzeugen lässt. Die Kontaktfahne bzw. ihr Kontaktfahnenmaterial besitzt zweckmäßigerweise Schweißeignung. D.h. es ist so ausgewählt, dass eine stoffschlüssige Verbindung mit einem elektrisch leitfähigen Verbinder, insbesondere einer anderen Kontaktfahne oder einer Zellverbinderplatte, realisierbar ist. Es kann weiterhin vorgesehen sein, dass die Kontaktfahne oder der Flachkörper der Kontaktfahne einen Rechteckquerschnitt oder einen anderen vergleichbaren Flachkörperquerschnitt besitzt. The invention understands an electrically conductive contact tab of a single battery cell to be a flat and possibly strip-shaped flat body made of metallic material, which can be, for example, a sheet metal strip. The contact lug or the flat body of the contact lug is expediently designed to be ductilely foldable transversely to its main extent, i.e. in particular ductilely bendable, so that a multi-layer fold can be produced relatively easily by bending the contact lug once or several times. The contact lug or its contact lug material is expediently suitable for welding. I.e. it is selected so that a cohesive connection with an electrically conductive connector, in particular another contact lug or a cell connector plate, can be realized. It can also be provided that the contact lug or the flat body of the contact lug has a rectangular cross section or another comparable flat body cross section.
Gemäß einer bevorzugten ersten Ausführungsform der Erfindung kann vorgesehen sein, dass der besagte Verbinder von einer Kontaktfahne einer weiteren Einzelbatteriezelle gebildet ist. Bei dieser Ausführungsform sind die Kontaktfahnen der beteiligten Einzelbatteriezellen direkt, d.h. ohne Zwischenelement, stoffschlüssig miteinander verbunden. Dies kann dadurch realisiert sein, dass die Kontaktfahne der weiteren, beispielsweise zur besagten Einzelbatteriezelle unmittelbar benachbarten, Einzelbatteriezelle oder ein eigens hierzu eingerichteter Verbindungsabschnitt der Kontaktfahne dieser Einzelbatteriezelle zur Mehrlagenfaltung der Kontaktfahne der Einzelbatteriezelle geführt, dort berührend aufgelegt und dann mit derselben durch Schweißen stoffschlüssig verbunden ist. Die Batterievorrichtung kann dadurch relativ kostengünstig hergestellt werden, da die Anzahl der bereitzustellenden Einzelbauteile verhältnismäßig gering ist, und relativ leichtgewichtig bauen, da aus der geringen Anzahl von Einzelbauteilen ein geringes Gesamtgewicht resultieren kann. According to a preferred first embodiment of the invention, it can be provided that said connector is formed by a contact lug of another individual battery cell. In this embodiment the contact lugs are of the individual battery cells involved are directly connected to one another, i.e. without an intermediate element. This can be realized in that the contact lug of the further single battery cell, for example immediately adjacent to the said single battery cell, or a specially designed connecting section of the contact lug of this single battery cell is guided to the multi-layer folding of the contact lug of the single battery cell, placed there in contact and then materially connected to it by welding . The battery device can thereby be manufactured relatively inexpensively, since the number of individual components to be provided is relatively small, and can be constructed in a relatively lightweight manner, since the small number of individual components can result in a low overall weight.
Gemäß einer bevorzugten weiteren Ausführungsform der Erfindung kann vorgesehen sein, dass der besagte Verbinder durch eine Zellverbinderplatte aus metallischem Material gebildet ist. Zur Realisierung einer elektrischen Kontaktierung kann die Zellverbinderplatte an die Mehrlagenfaltung der Einzelbatteriezelle angeordnet und durch Schweißen mit derselben stoffschlüssig verbunden sein. Hierbei ist die Mehrlagenfaltung der Einzelbatteriezelle unmittelbar berührend an der Zellverbinderplatte angeordnet. Zweckmäßigerweise ist die Zellverbinderplatte durch einen mechanisch starren Flachkörper gebildet, der insbesondere an einem Zellträger der Batterievorrichtung angeordnet sein kann. According to a preferred further embodiment of the invention, it can be provided that said connector is formed by a cell connector plate made of metallic material. To implement electrical contact, the cell connector plate can be arranged on the multi-layer fold of the individual battery cell and connected to it in a materially bonded manner by welding. Here, the multi-layer fold of the individual battery cell is arranged in direct contact with the cell connector plate. The cell connector plate is expediently formed by a mechanically rigid flat body, which can be arranged in particular on a cell carrier of the battery device.
Zweckmäßigerweise kann vorgesehen sein, dass die Mehrlagenfaltung zumindest zwei oder mehr flächig aufeinander angeordnete Einzellagen aufweist. Dadurch kann, wie vorstehend erwähnt, die resultierende Materialdicke der Mehrlagenfaltung relativ einfach eingestellt werden, sodass das eingesetzte Schweißverfahren auch an sich ändernde Randbedingungen angepasst und dann zuverlässig ausgeführt werden kann. Eine entsprechende Anpassung der Materialdi- cke der Mehrlagenfaltung kann notwendig sein, wenn die Kontaktfahnen der Einzelbatteriezellen aus einem anderen metallischen Material realisiert oder mit einer abweichenden Materialdicke bereitgestellt werden oder falls der besagte Verbinder von einer Zellverbinderplatte statt von einer Kontaktfahne gebildet ist. It can expediently be provided that the multi-layer fold has at least two or more individual layers arranged flat on top of each other. As a result, as mentioned above, the resulting material thickness of the multi-layer fold can be adjusted relatively easily, so that the welding process used can also be adapted to changing boundary conditions and then carried out reliably. A corresponding adjustment of the material di- The multi-layer folding may be necessary if the contact tabs of the individual battery cells are made from a different metallic material or are provided with a different material thickness or if the connector in question is formed by a cell connector plate instead of a contact tab.
Weiter zweckmäßigerweise kann vorgesehen sein, dass die Mehrlagenfaltung an einem freien Fahnenende der Kontaktfahne der Einzelbatteriezelle ausgebildet ist oder dasselbe bildet. Dies ist zweckmäßigerweise dadurch realisiert, dass die ungefaltete Kontaktfahne der Einzelbatteriezelle ein vom Zellkörper der Einzelbatteriezelle wegragendes, freies Fahnenende aufweist, das zur Realisierung der Mehrlagenfaltung ein- oder mehrfach umgefaltet ist. Umfalten kann im Sinne von umfalzen verstanden werden. Further expediently, it can be provided that the multi-layer fold is formed on a free tab end of the contact tab of the individual battery cell or forms the same. This is expediently realized in that the unfolded contact tab of the individual battery cell has a free tab end which projects away from the cell body of the individual battery cell and which is folded over one or more times to realize the multi-layer folding. Folding over can be understood in the sense of folding around.
In diesem Zusammenhang kann es zweckmäßig sein, wenn die Kontaktfahne der Einzelbatteriezelle so umgefaltet ist, dass eine erste, ein freies Fahnenende der ungefalteten Kontaktfahne bildende Einzellage der Mehrlagenfaltung über einen Umfaltrandbereich stoffschlüssig mit einer zweiten Einzellage der Mehrlagenfaltung verbunden ist. Die erste Einzellage ist dabei bezüglich der zweiten Einzellage bevorzugt so umgefaltet, dass sie an einer einem Zellkörper der Einzelbatteriezelle zu- oder abgewandten Großfläche der zweiten Einzellage flächig abgestützt ist. Hierbei kann optional vorgehsehen sein, dass die erste Einzellage oder die zweite Einzellage der Mehrlagenfaltung an einer von den Einzelbatteriezellen wegweisenden Anlagefläche eines Zellträgers der Batterievorrichtung fixiert oder zumindest abgestützt sind. Dadurch ist eine vorteilhafte, sich relativ kostengünstig bereitstellbare Mehrlagenfaltung aus zwei Einzellagen angegeben die optional an einem Zellträger der Batterievorrichtung festlegbar ist. In this context, it may be expedient if the contact tab of the individual battery cell is folded over in such a way that a first individual layer of the multi-layer fold, which forms a free tab end of the unfolded contact tab, is cohesively connected to a second individual layer of the multi-layer fold via a folded edge region. The first individual layer is preferably folded over with respect to the second individual layer in such a way that it is supported flat on a large area of the second individual layer facing or away from a cell body of the individual battery cell. It can optionally be provided here that the first individual layer or the second individual layer of the multi-layer fold is fixed or at least supported on a contact surface of a cell carrier of the battery device that faces away from the individual battery cells. This provides an advantageous multi-layer fold made up of two individual layers that can be provided relatively inexpensively and can optionally be fixed to a cell carrier of the battery device.
Wenn die erste Einzellage an der dem Zellkörper der Einzelbatteriezelle zuge- wandten Großfläche der zweiten Einzellage, die auch als erste Großfläche bezeichnet ist, angeordnet ist, kann vorgesehen sein, dass die Kontaktfahne oder ihre Mehrlagenfaltung über die erste Einzellage an dem besagten Zellträger der Batterievorrichtung fixiert oder zumindest an demselben abgestützt ist. Dadurch ist die Kontaktfahne oder ihre Mehrlagenfaltung relativ zum Zellträger unbeweglich oder zumindest in einer senkrecht auf dem Zellträger stehenden Arbeitsachse in Richtung zum Zellträger unbeweglich. Dadurch kann ein Schweißverfahren zur Realisierung einer elektrischen Kontaktierung der Einzelbatteriezelle relativ einfach und zuverlässig ausgeführt werden. Weiterhin, wenn alternativ die erste Einzellage an der dem Zellkörper der Einzelbatteriezelle abgewandten Großfläche der zweiten Einzellage, die auch als zweite Großfläche bezeichnet ist, angeordnet ist, kann vorgesehen sein, dass die Kontaktfahne oder ihre Mehrlagenfaltung über die zweite Einzellage an dem Zellträger der Batterievorrichtung fixiert oder zumindest abgestützt ist, wodurch sich ebenfalls eine vorteilhafte Fixierung der Kontaktfahne oder ihrer Mehrlagenfaltung am Zellträger oder zumindest eine Unbeweglichkeit relativ zum Zellträger in einer senkrecht auf dem Zellträger stehenden Arbeitsachse in Richtung zum Zellträger ergibt. If the first individual layer on the cell body of the individual battery cell is facing large area of the second individual layer, which is also referred to as the first large area, it can be provided that the contact tab or its multi-layer folding is fixed via the first individual layer to said cell carrier of the battery device or at least supported on it. As a result, the contact tab or its multi-layer fold is immovable relative to the cell carrier or at least immovable in the direction of the cell carrier in a working axis perpendicular to the cell carrier. As a result, a welding process for realizing electrical contacting of the individual battery cell can be carried out relatively simply and reliably. Furthermore, if alternatively the first individual layer is arranged on the large area of the second individual layer facing away from the cell body of the individual battery cell, which is also referred to as the second large area, it can be provided that the contact tab or its multi-layer fold is fixed to the cell carrier of the battery device via the second individual layer or at least supported, which also results in an advantageous fixation of the contact tab or its multi-layer fold on the cell carrier or at least an immobility relative to the cell carrier in a working axis perpendicular to the cell carrier in the direction of the cell carrier.
Um das Verschweißen der Einzellagen der Mehrlagenfaltung und des Verbinders zu erleichtern kann weiterhin vorgesehen sein, dass die Kontaktfahne L-förmig gestaltet ist. Eine dementsprechend L-förmig gestaltete Kontaktfahne besitzt zweckmäßigerweise eine unmittelbar an einem Zellkörper der Einzelbatteriezelle angeordnete Fahnenbasis und bezüglich der Fahnenbasis winkelig oder rechtwinkelig umgefaltete Einzellagen. In order to make it easier to weld the individual layers of the multi-layer fold and the connector, it can also be provided that the contact tab is L-shaped. A correspondingly L-shaped contact flag expediently has a flag base arranged directly on a cell body of the individual battery cell and individual layers folded at an angle or right angles with respect to the flag base.
Weiter zweckmäßigerweise kann vorgesehen sein, dass die Verbindungsnaht durch Laser-Schweißen erzeugt ist. Dadurch kann eine besonders kostengünstige und zugleich mechanisch robuste elektrische Kontaktierung ausgebildet wer- den. Die Erfindung ist jedoch nicht auf Laser-Schweißverfahren beschränkt, vielmehr können auch andere Schweißverfahren eingesetzt und dieselben Vorteile erzielt werden. It can further expediently be provided that the connecting seam is produced by laser welding. This makes it possible to create a particularly cost-effective and at the same time mechanically robust electrical contact. the. However, the invention is not limited to laser welding processes; other welding processes can also be used and the same advantages can be achieved.
Ein weiterer Grundgedanke der Erfindung liegt darin ein vorteilhaftes Fahrzeugbauteil bereitzustellen. Dies wird durch ein Fahrzeugbauteil, insbesondere ein Fahrzeugbatteriesystem, weiter insbesondere ein Fahrzeugtraktionsbatteriesystem, gelöst, das zumindest eine Batterievorrichtung nach der vorhergehenden Beschreibung aufweist. Another basic idea of the invention is to provide an advantageous vehicle component. This is solved by a vehicle component, in particular a vehicle battery system, further in particular a vehicle traction battery system, which has at least one battery device according to the previous description.
Zusammenfassend bleibt festzuhalten: Die vorliegende Erfindung betrifft zweckmäßigerweise eine Batterievorrichtung mit Einzelbatteriezellen, insbesondere Pouchzellen, die miteinander elektrisch leitfähig verbunden sind und zur Ausbildung der elektrischen Kontaktierung elektrisch leitfähige Kontaktfahnen aufweisen. Wesentlich für die Erfindung ist, dass zumindest eine solche Kontaktfahne in eine Mehrlagenfaltung aus beispielsweise zumindest zwei flächig aufeinander angeordneten, zusammenhängenden Einzellagen gelegt ist, die durch Schweißen miteinander sowie mit einem elektrisch leitfähigen Verbinder der Batterievorrichtung stoffschlüssig verbunden sind. Die Erfindung betrifft insbesondere ein Fahrzeugbauteil mit mindestens einer solchen Batterievorrichtung. In summary, the present invention expediently relates to a battery device with individual battery cells, in particular pouch cells, which are electrically conductively connected to one another and have electrically conductive contact tabs to form the electrical contact. It is essential for the invention that at least one such contact tab is placed in a multi-layer fold made up of, for example, at least two coherent individual layers arranged flat on top of each other, which are connected to one another by welding and to an electrically conductive connector of the battery device. The invention relates in particular to a vehicle component with at least one such battery device.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen. Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen. Bevorzugte Ausführungsformen der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen. It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the present invention. Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, with the same reference numbers referring to the same or similar or functionally the same components.
Es zeigen, jeweils schematisch Show it schematically
Fig. 1 eine Schnittansicht einer Batterievorrichtung, 1 is a sectional view of a battery device,
Fig. 2 einen Ausschnitt der Batterievorrichtung aus Fig. 1 , 2 shows a section of the battery device from FIG. 1,
Fig. 3 eine perspektivische Ansicht eines Zellträgers der Batterievorrichtung aus Fig. 1 . Fig. 3 is a perspective view of a cell carrier of the battery device from Fig. 1.
Die Fig. 1 bis 3 zeigen eine Ausführungsform einer im Gesamten mit der Bezugsziffer 1 bezeichneten Batterievorrichtung, die zur Speicherung von elektrischer Energie eingerichtet ist und bevorzugt in einem Fahrzeugbauteil, insbesondere einem Fahrzeugtraktionsbatteriesystem eines Fahrzeuges zum Einsatz kommt. 1 to 3 show an embodiment of a battery device, designated overall by reference number 1, which is set up to store electrical energy and is preferably used in a vehicle component, in particular a vehicle traction battery system of a vehicle.
Die Batterievorrichtung 1 besitzt eine Vielzahl von auf einer geraden Stapelbahn 20 hintereinanderliegend angeordneten, wiederaufladbaren Einzelbatteriezellen 2, 3, die rein exemplarisch durch Pouchzellen realisiert sind. Die Einzelbatteriezellen 2, 3 besitzen jeweils einen Zellkörper 15, die in einem gehäuseartigen Zellträger 18 jeweils in einem separaten Steckplatz gehaltert sind. Die Einzelbatteriezellen 2, 3 weisen weiterhin eine vom jeweiligen Zellkörper 15 zu einer Steckplatz-Öffnung wegragende elektrisch leitfähige Kontaktfahne 4, 5 auf, anhand welcher eine jeweilige Einzelbatteriezelle 2, 3 elektrisch kontaktierbar ist. Die Kontaktfahnen 4, 5 sind rein exemplarisch durch einen im ungefalteten Zustand ebenen, streifenförmigen Flachkörper aus metallischem Material realisiert und duktil faltbar, d.h. insbesondere biegbar, sodass sie sich relativ einfach und ggf. mit relativ geringem Kraftaufwand falten oder umbiegen lassen. Der unmittelbar an einem Zellkörper 15 einer Einzelbatteriezelle 2, 3 befindliche Abschnitt einer Kontaktfahne 4, 5 wird vorliegend als Fahnenbasis 13 einer Einzelbatteriezelle 2, 3 verstanden, während ein sich an einer bezüglich dem Zellkörper 15 abgewandten Seite der Fahnenbasis 13 an die Fahnenbasis 13 anschließender Abschnitt einer Kontaktfahne 4, 5 als freies Fahnenende 12 einer Kontaktfahne 4, 5 einer Einzelbatteriezelle 2, 3 bezeichnet ist. The battery device 1 has a large number of rechargeable individual battery cells 2, 3 arranged one behind the other on a straight stacking path 20, which are implemented purely as an example by pouch cells. The individual battery cells 2, 3 each have a cell body 15, which are each held in a separate slot in a housing-like cell carrier 18. The individual battery cells 2, 3 also have an electrically conductive contact lug 4, 5 which projects away from the respective cell body 15 to a slot opening, by means of which a respective individual battery cell 2, 3 can be electrically contacted. The contact flags 4, 5 are realized, purely as an example, by a strip-shaped flat body made of metallic material that is flat in the unfolded state and can be ductilely folded, ie in particular bendable, so that they can be folded or bent relatively easily and, if necessary, with relatively little effort. The section of a contact lug 4, 5 located directly on a cell body 15 of an individual battery cell 2, 3 is understood in the present case as the lug base 13 of an individual battery cell 2, 3, while a section adjoining the lug base 13 on a side of the lug base 13 facing away from the cell body 15 a contact lug 4, 5 is referred to as a free lug end 12 of a contact lug 4, 5 of a single battery cell 2, 3.
Zur elektrischen Kontaktierung der Einzelbatteriezellen 2, 3 ist vorgesehen, dass die ungefalteten Kontaktfahnen 4, 5 durch die Steckplatz-Öffnung eines Steckplatzes durchgesteckt und deren freien Fahnenenden 12 jeweils in eine Mehrlagenfaltung 6 aus exemplarisch zwei zusammenhängenden, flächig aufeinander angeordneten Einzellagen 7, 8 gelegt oder gefaltet werden. Die Einzellagen 7, 8 hängen integral zusammen, in der Art, dass eine erste, ein freies Fahnenende 12 der ungefalteten Kontaktfahne 4, 5 bildende Einzellage 7 der jeweiligen Mehrlagenfaltung 6 über einen Umfaltrandbereich 14 stoffschlüssig mit einer zweiten Einzellage 8 der jeweiligen Mehrlagenfaltung 6 verbunden ist, was insbesondere in Fig. 1 und 2 zu erkennen ist. Dort ist auch zu erkennen, dass die erste Einzellage 7 bezüglich der zweiten Einzellage 8 so umgefaltet ist, dass sie sich an einer bezüglich dem Zellkörper 15 zugewandten ersten Großfläche 16 der zweiten Einzellage 8 flächig abstützt und dass die Einzellagen 7, 8 bezüglich der jeweiligen Fahnenbasis 13 an einem weiteren, bezüglich dem Umfaltrandbereich 14 entgegengesetzten Umfaltrandbereich 22 winkelig oder bevorzugt rechtwinkelig umgefaltet sind, sodass sich mit Blick von der Seite eine in etwa L-förmige Gestalt der Kontaktfahnen 4, 5 ergibt. Weiterhin ist vorgesehen, dass ein elektrisch leitfähiger Verbinder 9 der Batterievorrichtung 1 , der vorliegend durch eine ebene, elektrisch leitfähige Zellverbinderplatte 11 realisiert ist, auf einer zweiten, bezüglich der ersten Großfläche 16 der zweiten Einzellage 8 entgegengesetzten Großfläche 17 der zweiten Einzellage 8 angeordnet ist. Weiterhin ist zur Realisierung einer stoffschlüssigen Verbindung der Einzelbatteriezellen 2, 3 mit dem Verbinder 9 vorgesehen, dass die Einzellagen 7, 8 der jeweiligen Mehrlagenfaltungen 6 sowie die Zellverbinderplatte 11 durch eine durch Laser-Schweißen erzeugte Verbindungsnaht 10 stoffschlüssig miteinander verbunden sind. In Fig. 1 und 2 ist ein Wirkbereich, beispielsweise ein thermischer Einflussbereich, des beim Laser-Schweiß- verfahrens eingesetzten Laserstrahls durch einen gestrichelten Rahmen 21 angedeutet. Dadurch ist eine elektrische Kontaktierung der Einzelbatteriezellen 2, 3 bereitgestellt, wobei durch die Mehrlagenfaltungen 6 der Schweißvorgang vergleichsweise zuverlässig ausführbar ist. Dies liegt, wie vorstehend erwähnt, darin begründet, dass die Mehrlagenfaltungen 6 der Kontaktfahnen 4, 5 eine im Vergleich zur Materialdicke der ungefalteten Kontaktfahne 4, 5 relativ große Materialdicke besitzt, wodurch die im Rahmen des Schweißvorgangs in das Kontaktfahnenmaterial eingebrachte thermische Energie zwar zum lokalen Aufschmelzen der Kontaktfahnen 4, 5 und des Verbinders 9, 11 und damit zur planmäßigen Erzeugung der Verbindungsnaht 10 genügt, die Gefahr des vollständigen Aufschmelzens der Kontaktfahnen 4, 5 und/oder des Verbinders 9, 11 jedoch nicht mehr besteht oder ist zumindest reduziert ist. For electrical contacting of the individual battery cells 2, 3, it is provided that the unfolded contact lugs 4, 5 are inserted through the slot opening of a slot and their free lug ends 12 are each placed in a multi-layer fold 6 made up of, for example, two contiguous individual layers 7, 8 arranged flat on top of each other or be folded. The individual layers 7, 8 are integrally connected in such a way that a first individual layer 7 of the respective multi-layer fold 6, which forms a free flag end 12 of the unfolded contact flag 4, 5, is cohesively connected to a second individual layer 8 of the respective multi-layer fold 6 via a folded edge region 14 , which can be seen in particular in FIGS. 1 and 2. It can also be seen there that the first individual layer 7 is folded over with respect to the second individual layer 8 in such a way that it is supported flatly on a first large surface 16 of the second individual layer 8 facing the cell body 15 and that the individual layers 7, 8 with respect to the respective flag base 13 are folded at an angle or preferably at a right angle on a further folding edge area 22 opposite the folding edge area 14, so that an approximately L-shaped shape of the contact tabs 4, 5 results when viewed from the side. Furthermore, it is provided that an electrically conductive connector 9 of the battery device 1, which in the present case is electrically connected by a flat conductive cell connector plate 11 is realized, is arranged on a second large surface 17 of the second individual layer 8 which is opposite to the first large area 16 of the second individual layer 8. Furthermore, in order to realize a cohesive connection of the individual battery cells 2, 3 with the connector 9, it is provided that the individual layers 7, 8 of the respective multi-layer folds 6 and the cell connector plate 11 are cohesively connected to one another by a connecting seam 10 produced by laser welding. In FIGS. 1 and 2, an effective range, for example a thermal influence range, of the laser beam used in the laser welding process is indicated by a dashed frame 21. This provides electrical contacting of the individual battery cells 2, 3, with the multi-layer folds 6 allowing the welding process to be carried out comparatively reliably. As mentioned above, this is due to the fact that the multi-layer folds 6 of the contact tabs 4, 5 have a relatively large material thickness compared to the material thickness of the unfolded contact tab 4, 5, whereby the thermal energy introduced into the contact tab material during the welding process is local Melting the contact lugs 4, 5 and the connector 9, 11 and thus for the planned production of the connecting seam 10 is sufficient, but the risk of the contact lugs 4, 5 and/or the connector 9, 11 completely melting no longer exists or is at least reduced.
Weiterhin ist zu erwähnen, dass vorliegend die Kontaktfahnen 4, 5 über ihre ersten Einzellagen 7 an ebenen, von den Zellkörpern 15 wegweisenden Anlagefläche 19 des Zellträgers 18 fixiert oder zumindest an denselben abgestützt sind. Dadurch sind die Kontaktfahnen 4, 5 oder ihre Mehrlagenfaltungen 6 relativ zum Zellträger 18 unbeweglich oder zumindest in einer senkrecht auf der Anlageflä- ehe 19 des Zellträgers 18 stehenden Arbeitsachse in Richtung zum Zellträger 18 unbeweglich gehalten, wodurch vorteilhafterweise der Schweißvorgang noch zuverlässiger realisiert werden kann. Furthermore, it should be mentioned that in the present case the contact tabs 4, 5 are fixed via their first individual layers 7 on flat contact surfaces 19 of the cell carrier 18 facing away from the cell bodies 15 or are at least supported on the same. As a result, the contact tabs 4, 5 or their multi-layer folds 6 are immovable relative to the cell carrier 18 or at least in a vertical position on the contact surface. before 19 of the cell carrier 18 standing working axis in the direction of the cell carrier 18 is kept immobile, which advantageously allows the welding process to be carried out even more reliably.
***** *****

Claims

Ansprüche Expectations
1 . Eine zur Speicherung von elektrischer Energie eingerichtete Batterievorrichtung (1) 1 . A battery device (1) designed to store electrical energy
- mit Einzelbatteriezellen (2, 3), insbesondere Pouchzellen, die zu ihrer elektrischen Kontaktierung elektrisch leitfähige Kontaktfahnen (4, 5) aufweisen,- with individual battery cells (2, 3), in particular pouch cells, which have electrically conductive contact tabs (4, 5) for their electrical contacting,
- wobei die Kontaktfahne (4) zumindest einer Einzelbatteriezelle (2) in eine Mehrlagenfaltung (6) aus flächig aufeinander angeordneten Einzellagen (7, 8) gelegt ist, - wherein the contact tab (4) of at least one individual battery cell (2) is placed in a multi-layer fold (6) made of individual layers (7, 8) arranged flat on top of each other,
- wobei zur elektrischen Kontaktierung der zumindest einen Einzelbatteriezelle (2) die Einzellagen (7, 8) ihrer Kontaktfahne (4) und ein elektrisch leitfähiger Verbinder (9) der Batterievorrichtung (1) anhand einer durch Schweißen erzeugten Verbindungsnaht (10) stoffschlüssig miteinander verbunden sind. - wherein for electrical contacting of the at least one individual battery cell (2), the individual layers (7, 8) of its contact lug (4) and an electrically conductive connector (9) of the battery device (1) are materially connected to one another using a connecting seam (10) created by welding .
2. Batterievorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass der Verbinder (9) von einer Kontaktfahne (5) einer weiteren Einzelbatteriezelle (3) gebildet ist. 2. Battery device (1) according to claim 1, characterized in that the connector (9) is formed by a contact lug (5) of a further individual battery cell (3).
3. Batterievorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass der Verbinder (9) durch eine Zellverbinderplatte (11 ) gebildet ist. 3. Battery device (1) according to claim 1, characterized in that the connector (9) is formed by a cell connector plate (11).
4. Batterievorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mehrlagenfaltung (6) zumindest zwei oder mehr flächig aufeinander angeordnete Einzellagen (7, 8) aufweist. 4. Battery device (1) according to one of the preceding claims, characterized in that the multi-layer fold (6) has at least two or more individual layers (7, 8) arranged flat on top of each other.
5. Batterievorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mehrlagenfaltung (6) an einem freien Fahnenende (12) der ungefalteten Kontaktfahne (4) der zumindest einen Einzelbatteriezelle (2) realisiert ist. 5. Battery device (1) according to one of the preceding claims, characterized in that the multi-layer fold (6) is realized on a free tab end (12) of the unfolded contact tab (4) of the at least one individual battery cell (2).
6. Batterievorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine erste, ein freies Fahnenende (12) der ungefalteten Kontaktfahne (4) bildende Einzellage (7) der Mehrlagenfaltung (6) über einen Umfaltrandbereich (14) stoffschlüssig mit einer zweiten Einzellage (8) der Mehrlagenfaltung (6) verbunden ist, wobei die erste Einzellage (7) bezüglich der zweiten Einzellage (8) so umgefaltet ist, dass sie an einer bezüglich einem Zellkörper (15) der Einzelbatteriezellen (2, 3) zu- oder abgewandten Großfläche (16, 17) der zweiten Einzellage (8) flächig abgestützt ist. 6. Battery device (1) according to one of the preceding claims, characterized in that a first single layer (7) of the multi-layer fold (6), which forms a free flag end (12) of the unfolded contact flag (4), is cohesively bonded to a folded edge region (14). second individual layer (8) of the multi-layer fold (6), the first individual layer (7) being folded over with respect to the second individual layer (8) in such a way that it is attached to a cell body (15) of the individual battery cells (2, 3). or facing away from the large surface (16, 17) of the second individual layer (8).
7. Batterievorrichtung (1 ) nach Anspruch 6, dadurch gekennzeichnet, dass die erste Einzellage (7) oder die zweite Einzellage (8) an einer bezüglich den Einzelbatteriezellen (2, 3) abgewandten Anlagefläche (19) eines Zellträgers (18) der Batterievorrichtung (1 ) fixiert oder zumindest abgestützt ist. 7. Battery device (1) according to claim 6, characterized in that the first individual layer (7) or the second individual layer (8) on a contact surface (19) of a cell carrier (18) of the battery device (19) facing away from the individual battery cells (2, 3). 1) is fixed or at least supported.
8. Batterievorrichtung (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kontaktfahne (4) L-förmig gestaltet ist. 8. Battery device (1) according to one of the preceding claims, characterized in that the contact lug (4) is L-shaped.
9. Batterievorrichtung (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsnaht (10) durch Laser-Schweißen erzeugt ist. 9. Battery device (1) according to one of the preceding claims, characterized in that the connecting seam (10) is produced by laser welding.
10. Fahrzeugbauteil, insbesondere ein Fahrzeugbatteriesystem, weiter insbesondere ein Fahrzeugtraktionsbatteriesystem, aufweisend zumindest eine Batterievorrichtung (1 ) nach einem der vorhergehenden Ansprüche. 10. Vehicle component, in particular a vehicle battery system, further in particular a vehicle traction battery system, having at least one battery device (1) according to one of the preceding claims.
PCT/EP2023/071164 2022-09-16 2023-07-31 Battery device and vehicle component comprising same WO2024056266A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3518320A1 (en) * 2016-09-26 2019-07-31 Nissan Motor Co., Ltd. Battery pack
US20210074985A1 (en) * 2019-09-09 2021-03-11 GM Global Technology Operations LLC Battery assembly and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017068706A1 (en) 2015-10-22 2017-04-27 日産自動車株式会社 Battery pack and method for producing battery pack

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3518320A1 (en) * 2016-09-26 2019-07-31 Nissan Motor Co., Ltd. Battery pack
US20210074985A1 (en) * 2019-09-09 2021-03-11 GM Global Technology Operations LLC Battery assembly and method

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