WO2024056266A1 - Dispositif de batterie et composant de véhicule le comprenant - Google Patents

Dispositif de batterie et composant de véhicule le comprenant 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
Authority
WO
WIPO (PCT)
Prior art keywords
individual
battery device
battery
layer
contact
Prior art date
Application number
PCT/EP2023/071164
Other languages
German (de)
English (en)
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/fr

Links

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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne un dispositif de batterie (1) comprenant des éléments de batterie individuels (2, 3), en particulier des éléments de type poche, qui sont connectés les uns aux autres de manière électriquement conductrice et comportent des pattes de contact conductrices (4, 5) pour établir le contact électrique. L'invention est caractérisée en ce qu'au moins une telle patte de contact (4, 5) est placée dans un pli multicouche (6) fait de couches individuelles contiguës (7, 8) qui sont disposées à plat les unes sur les autres et sont reliées en une seule pièce, par soudage, l'une à l'autre, ainsi qu'à un connecteur conducteur (9) du dispositif de batterie (1). L'invention concerne également un composant de véhicule comprenant au moins un tel dispositif de batterie (1).
PCT/EP2023/071164 2022-09-16 2023-07-31 Dispositif de batterie et composant de véhicule le comprenant WO2024056266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022209738.6A DE102022209738A1 (de) 2022-09-16 2022-09-16 Batterievorrichtung sowie Fahrzeugbauteil mit derselben
DE102022209738.6 2022-09-16

Publications (1)

Publication Number Publication Date
WO2024056266A1 true WO2024056266A1 (fr) 2024-03-21

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PCT/EP2023/071164 WO2024056266A1 (fr) 2022-09-16 2023-07-31 Dispositif de batterie et composant de véhicule le comprenant

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DE (1) DE102022209738A1 (fr)
WO (1) WO2024056266A1 (fr)

Citations (2)

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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108140790B (zh) 2015-10-22 2019-04-09 日产自动车株式会社 组电池及组电池的制造方法

Patent Citations (2)

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

Also Published As

Publication number Publication date
DE102022209738A1 (de) 2024-03-21

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