WO2024251782A1 - Interchangeable rechargeable battery pack for a consumer - Google Patents

Interchangeable rechargeable battery pack for a consumer Download PDF

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Publication number
WO2024251782A1
WO2024251782A1 PCT/EP2024/065415 EP2024065415W WO2024251782A1 WO 2024251782 A1 WO2024251782 A1 WO 2024251782A1 EP 2024065415 W EP2024065415 W EP 2024065415W WO 2024251782 A1 WO2024251782 A1 WO 2024251782A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery pack
maximum
milliohms
battery cells
connection
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.)
Ceased
Application number
PCT/EP2024/065415
Other languages
German (de)
French (fr)
Inventor
Jan Breitenbach
Florian Kneer
Andreas GONSER
Holger Wernerus
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP24731894.2A priority Critical patent/EP4725074A1/en
Publication of WO2024251782A1 publication Critical patent/WO2024251782A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • 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
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • 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
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • 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
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • 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

Definitions

  • the present invention relates to a removable battery pack for a consumer, as well as a consumer, in particular a power tool.
  • Interchangeable battery packs are known for consumers such as power tools, which have a number of battery cells for storing electrical energy for operating the consumer.
  • the efficiency and operational reliability of such interchangeable battery packs usually depends on a variety of factors.
  • An electrical transmission path based on the electrical energy chemically stored inside the battery cells often has a particular influence. Due to the large number of components of the interchangeable battery pack, which are often connected to one another, and other requirements in terms of installation space and weight, there are often several loss factors that impair the efficiency of the battery pack.
  • the interchangeable battery pack according to the invention with the features of claim 1 is characterized by a particularly high performance.
  • higher power preferably a larger electrical current
  • heating of the interchangeable battery pack during operation can advantageously be reduced, whereby in particular the longevity, operational reliability and efficiency of the interchangeable battery pack can be increased.
  • an interchangeable battery pack for a consumer in particular for a power tool, comprising at least two battery cells, at least one cell connector, and a first contact element and a second contact element.
  • the two contact elements are designed for the electrical connection of the removable battery pack. This means that the electrical energy can be provided to other components of the consumer, for example an electric motor, at the two contact elements.
  • Each battery cell of the removable battery pack is electrically connected to the at least one cell connector by means of a connection.
  • the battery cells and the at least one cell connector and each connection are designed in such a way that the total AC internal resistance of the removable battery pack between the first contact element and the second contact element is a maximum of 40 milliohms.
  • An alternating current internal resistance is considered to be an AC internal resistance.
  • Such an AC internal resistance is preferably determined according to a standardized measuring method, preferably according to DIN EN IEC 61960.
  • the battery cells and the at least one cell connector and each connection of the removable battery pack can be designed such that a total DC internal resistance is a maximum of 12 milliohms, preferably a maximum of 9 milliohms, in particular a maximum of 7 milliohms.
  • a direct current internal resistance can be regarded as a DC internal resistance.
  • such a DC internal resistance is determined according to a standardized method, such as according to DIN EN IEC 61960.
  • a removable battery pack in which preferably all elements inside the removable battery pack involved in providing the electrical current are designed and preferably coordinated with one another in such a way that the total AC internal resistance is as low as possible, in detail a maximum of 40 milliohms.
  • This can preferably be made possible in a variety of ways, for example by providing battery cells with low internal resistance, by providing cell connectors with the lowest possible electrical resistance, and by connections that have optimal efficiency in power transmission.
  • the interchangeable battery pack according to the invention offers the advantage that an electrical energy storage device with particularly high performance can be provided for consumers, such as power tools. The fact that there is a particularly low AC internal resistance enables a particularly high power output from the interchangeable battery pack.
  • the battery cells and the at least one cell connector and each connection of the interchangeable battery pack are designed such that the total AC internal resistance of the interchangeable battery pack is a maximum of 30 milliohms, in particular a maximum of 21 milliohms. This makes it possible to provide a particularly powerful and efficient interchangeable battery pack.
  • a plurality of battery cells are electrically connected to one another in series by means of the at least one cell connector.
  • a plurality of battery cells are electrically connected to one another in parallel by means of the at least one cell connector.
  • the battery cells are electrically connected to one another in series.
  • the battery cells are electrically connected exclusively in series.
  • the battery cells are preferably connected to one another in a single layer.
  • such a configuration can also be referred to as a 5s1p configuration of the removable battery pack.
  • a removable battery pack with a A total voltage of 18 V is provided.
  • the battery cells and the at least one cell connector and all connections of the interchangeable battery pack are designed such that the total AC internal resistance is a maximum of 21 milliohms, preferably a maximum of 16 milliohms, in particular a maximum of 11 milliohms.
  • the battery cells are electrically connected to one another in series.
  • two battery cells are electrically connected to one another in parallel.
  • a configuration can also be referred to as a 5s2p configuration of the removable battery pack.
  • the battery cells and the at least one cell connector and all connections of the removable battery pack are designed such that the total AC internal resistance is a maximum of 12 milliohms, preferably a maximum of 9 milliohms, in particular a maximum of 6 milliohms.
  • the battery cells and the at least one cell connector and all connections of the removable battery pack are designed such that the total AC internal resistance is a maximum of 7 milliohms, preferably a maximum of 6 milliohms, in particular a maximum of 4 milliohms. This makes it possible to provide a particularly powerful removable battery pack.
  • the battery cells are particularly preferably designed as lithium-ion battery cells.
  • a design of the battery cells in a multi-tab configuration is particularly advantageous, that is to say in particular with a large number of tabs which form the electrical pole of the battery cell or are connected to it.
  • Such a multi-tab configuration of a lithium-ion battery cell offers the advantage of a particularly low internal resistance.
  • Such battery cells with a maximum AC internal resistance of 8 milliohms, preferably e milliohms, in particular 4 milliohms, are particularly advantageous. per battery cell. This makes it possible to provide a removable battery pack with a particularly low overall AC internal resistance and thus particularly high performance and efficiency.
  • the battery cells are cylindrical and are arranged adjacent to one another along a longitudinal axis and/or radially next to one another. This means that several battery cells can be arranged stacked in the axial direction. Alternatively or additionally, several battery cells can be arranged next to one another in a plane orthogonal to the longitudinal axis. This makes it possible to provide a flexible and compact structure for the interchangeable battery pack.
  • the battery cells are particularly preferably in 21700 format.
  • connection is particularly preferably a material connection, preferably a laser welded connection, or a resistance welded connection, or a bonded connection, or a soldered connection. This makes it possible to provide an electrically conductive connection between battery cells and cell connectors with low electrical resistance while being easy and cost-effective to manufacture.
  • connection preferably has several contact points per pole of each battery cell.
  • the battery cells are electrically connected to the cell connector at the contact points. This makes it possible to provide defined connection points between the cell connector and the battery cell, which has an advantageous effect on a mechanical connection between the cell connector and the battery cell, as well as on low electrical resistance and simple and cost-effective manufacture.
  • all contact points of the connection are arranged at at least a predetermined first distance from a center point of the respective pole of the corresponding battery cell.
  • each pole is located on an axial end face of the corresponding battery cell.
  • the center point corresponds to a center of the preferably circular end face.
  • a prohibition zone is defined which corresponds to an area with a radius corresponding to the first distance, within which none of the contact points are arranged.
  • the contact points are distributed widely across the cell cross-section. This allows for an optimal flow of current from the battery cell to the cell connector and thus a low contact resistance, which makes it particularly advantageous to enable the low AC internal resistance of the interchangeable battery pack.
  • the first distance at the positive pole is at least 2 mm, preferably at least 3 mm.
  • the first distance at the negative pole is at least 3 mm, in particular at least 4 mm.
  • this allows a greater distance between the contact point and the center point at the larger negative pole, i.e. a wider distribution of the contact point over the pole.
  • all contact points are arranged at at least a predetermined second distance from one another.
  • the second distance is preferably at least 2 mm, in particular at least 3 mm.
  • all of the contact points also have a predetermined minimum distance from one another in order to ensure a broad distribution of the contact points over the surface of the respective pole of the battery cell. This can also promote optimal current flow and low contact resistance.
  • the at least one cell connector is designed as a sheet metal, which preferably has a thickness of at least 0.1 mm, preferably of at least 0.2 mm, in particular a maximum of 0.5 mm, and preferably a cross-sectional area of at least 0.5 mm 2 , preferably at least 4 mm 2 , in particular a maximum of 15 mm 2 .
  • the sheet metal i.e. the cell connector, is particularly preferably made of copper or a copper alloy or of steel. This enables efficient current transmission through the cell connector to be provided in order to enable the low AC internal resistance.
  • the cell connector preferably has a contact region on which the contact points are arranged, and a base region which is connected to the contact region.
  • the contact region and the base region are preferably formed together as a one-piece component.
  • the base region is arranged at a predetermined third distance from the contact region with respect to the axial direction.
  • the base region and contact area are arranged offset from one another in the axial direction of the battery cell, in particular such that the contact area is arranged closer to the pole of the battery cell than the base area.
  • this can be provided by means of a bend between the base area and the contact area.
  • This makes it possible to provide a defined design with a particularly simple and cost-effective geometry of the cell connector, which reliably ensures electrical contact exclusively at the contact area. For example, this can also ensure a certain distance between the base area and the pole, so that unintentional contact with the pole can be avoided.
  • the invention leads to a consumer, in particular a power tool, comprising the described interchangeable battery pack.
  • the consumer comprises at least one electric motor, wherein the removable battery pack is configured to provide electrical energy for the at least one electric motor.
  • Figure 1 is a perspective view of a removable battery pack according to a first embodiment of the invention
  • FIG. 1 is a detailed view of the removable battery pack of Figure 1
  • Figure 3 is an enlarged detail of Figure 2
  • Figure 4 is a detailed view of an interchangeable battery pack according to a second embodiment of the invention.
  • Figure 1 shows a perspective view of a removable battery pack 1 according to a first embodiment of the invention.
  • Figures 2 and 3 show detailed views of the removable battery pack 1 of Figure 1.
  • the interchangeable battery pack 1 serves as an electrical energy storage device for a consumer (not shown), such as a power tool, preferably one that can be operated by hand. Preferably, at least one electric motor of the consumer can be supplied with the electrical energy stored in the interchangeable battery pack 1.
  • the interchangeable battery pack 1 can be detachably connected to a tool part of the consumer by means of a connection mechanism that is not described in more detail. This means that the interchangeable battery pack 1 can be replaced, for example, with an identical interchangeable battery pack 1.
  • An electrical connection between the removable battery pack 1 and the other components, such as the electric motor, of the consumer is made by means of contact elements 11, 12 on the removable battery pack 1.
  • a different electrical potential is present at the two contact elements 11, 12.
  • the interchangeable battery pack 1 further comprises several battery cells 2 and several cell connectors 4 (see Figure 2).
  • the battery cells 2 and cell connectors 4 are accommodated within a housing 50 (see Figure 1), which is provided for protection.
  • the battery cells 2 can also be held in position relative to one another by means of a cell holder 60.
  • the battery cells 2 are designed as cylindrical lithium-ion cells in the 21700 format. In the removable battery pack 1, all battery cells 2 are arranged parallel to one another, i.e. parallel to a longitudinal axis 15.
  • a plurality of battery cells 2 are electrically connected to one another by means of the cell connectors 4.
  • the cell connectors 4 are designed as copper sheets, which preferably have a thickness of at least 0.1 mm and in particular a cross-sectional area of at least 1 mm 2 .
  • the interchangeable battery pack 1 of the first embodiment comprises a total of 15 battery cells 2, which are electrically connected to one another by means of the cell connectors 4 in such a way as to provide a so-called 5s3p configuration. This means that five battery cells 2 are electrically connected to one another in series, and at the same time three battery cells 2 are electrically connected to one another in parallel.
  • the battery cells 2 are electrically connected to the two contact elements 11, 12 via the cell connectors 4.
  • the respective different poles 21, 31, namely positive pole 21 and negative pole 31, of the battery cells 2 are arranged on the two axial end faces of the battery cells 2.
  • Each pole 21, 31 is electrically connected to one of the cell connectors 4 by means of a connection 5.
  • Each connection 5 preferably has several resistance welded connections.
  • the cell connectors 4 are preferably designed such that they have a contact region 41 which is preferably circular and in particular concentric to the positive pole 21.
  • the cell connectors 4 at the positive pole 21 comprise a base region 42 which surrounds the contact region 41. With respect to the direction of the longitudinal axis 15, the contact region 41 is arranged closer to the positive pole 21 at a predetermined distance, for example of at least 0.5 mm, from the base region 42.
  • the corresponding connection 5 has several contact points 51, at which the corresponding pole 21, 31 of the battery cell is electrically connected to the cell connector 4.
  • a separate resistance welding connection is provided at each of the contact points 51.
  • exactly four contact points 51 are provided per pole 21, 31.
  • a different number of contact points 51 can also be provided, for example exactly two contact points 51.
  • the contact points 51 are arranged such that they are arranged at least at a predetermined first distance 52 from a center point 25 of the respective pole 21, 31 (see Figure 3).
  • the first distance 52 is preferably at least 3 mm at the positive pole 21.
  • a wider distribution of the contact points 51 can be made possible at the negative pole 31, so that the first distance 52 at the negative pole 31 is preferably at least 4 mm.
  • a prohibited zone is defined around the center point 25 of the respective pole 21, 31, within which none of the contact points 51 is arranged.
  • all contact points 51 are arranged at least a predetermined second distance 53 from each other.
  • the second distance 53 is at least 3 mm.
  • the contact points 51 By arranging the contact points 51 according to the predetermined distances 52, 53, the contact points 51 can be distributed as widely or as extensively as possible over the respective pole 21, 31. In particular, current can be tapped as widely as possible over the pole 21, 31, so that an optimal current flow from the battery cell 2 to the cell connector 4 can be provided with the lowest possible contact resistance.
  • the cell connectors 4 are slotted. This makes it possible to produce the connections 5 more easily by means of resistance welding. In particular, when using an alternative connection method, cell connectors 4 without a slot can also be provided.
  • the battery cells 2, the cell connectors 4 and all connections 5 are specially designed in such a way that the total AC internal resistance of the entire exchangeable battery pack 1 is a maximum of 7 milliohms.
  • the total AC internal resistance of the exchangeable battery pack 1 is defined between the first contact element 11 and the second contact element 12.
  • the exchangeable battery pack 1 can be provided with a particularly high performance.
  • a particularly high power output to other components of the consumer can be made possible, for example.
  • high power can be drawn from the removable battery pack 1, for example through larger currents.
  • the heating of the removable battery pack 1 can be kept low, which can also increase the service life of the removable battery pack 1.
  • FIG 4 shows a detailed view of a removable battery pack 1 according to a second embodiment of the invention.
  • the second embodiment essentially corresponds to the first embodiment of Figures 1 to 3, with the difference of an alternative number of battery cells 2.
  • the removable battery pack 1 comprises a total of five battery cells 2, with all battery cells 2 being electrically connected in series with one another by means of the cell connectors 4. This means that the removable battery pack 1 of the second embodiment is designed in a so-called 5s1p configuration.
  • the battery cells 2, the cell connectors 4, and all connections 5 are designed in such a way as to provide a total AC internal resistance of the interchangeable battery pack 1 of a maximum of 21 milliohms. This means that, for example, with a given number of battery cells 2 and/or a given geometric size, an optimal performance of the interchangeable battery pack 1 can be provided.

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

Abstract

The invention relates to an interchangeable rechargeable battery pack (1) for a consumer, in particular for a power tool, comprising at least two rechargeable cells (2), at least one cell connector (4), and a first contact element (11) and a second contact element (12) for electrically connecting the interchangeable rechargeable battery pack (1), wherein each rechargeable cell (2) is electrically conductively connected to the at least one cell connector (4) by means of a connection (5), and wherein the rechargeable cells (2) and the at least one cell connector (4) and each connection (5) are configured such that a total AC internal resistance of the interchangeable rechargeable battery pack (1) between the first contact element (11) and the second contact element (12) is at most 40 milliohms.

Description

Beschreibung Description

Titel title

Wechselakkupack für einen Verbraucher removable battery pack for one consumer

Stand der Technik State of the art

Die vorliegende Erfindung betrifft ein Wechselakkupack für einen Verbraucher, sowie einen Verbraucher, insbesondere ein Elektrowerkzeug. The present invention relates to a removable battery pack for a consumer, as well as a consumer, in particular a power tool.

Bekannt sind Wechselakkupacks für Verbraucher, wie Elektrowerkzeuge, welche eine Mehrzahl an Akkuzellen aufweisen, zur Speicherung von elektrischer Energie für den Betrieb des Verbrauchers. Eine Effizienz und Betriebssicherheit bei der Verwendung derartiger Wechselakkupacks ist üblicherweise von verschiedensten Faktoren abhängig. Besonderen Einfluss hat dabei häufig ein elektrischer Übertragungsweg ausgehend von der chemisch im Inneren der Akkuzellen gespeicherten elektrischen Energie. Durch eine Vielzahl an häufig miteinander verbundenen Komponenten des Wechselakkupacks und weitere Anforderungen an Bauraum und Gewicht, ergeben sich dabei häufig mehrere Verlustfaktoren, welche die Effizienz des Akkupacks beeinträchtigen. Interchangeable battery packs are known for consumers such as power tools, which have a number of battery cells for storing electrical energy for operating the consumer. The efficiency and operational reliability of such interchangeable battery packs usually depends on a variety of factors. An electrical transmission path based on the electrical energy chemically stored inside the battery cells often has a particular influence. Due to the large number of components of the interchangeable battery pack, which are often connected to one another, and other requirements in terms of installation space and weight, there are often several loss factors that impair the efficiency of the battery pack.

Offenbarung der Erfindung disclosure of the invention

Der erfindungsgemäße Wechselakkupack mit den Merkmalen des Anspruchs 1 zeichnet sich demgegenüber durch eine besonders hohe Leistungsfähigkeit aus. Insbesondere können dabei höhere Leistungen, vorzugsweise ein größerer elektrischer Strom, aus dem Wechselakkupack entnommen werden. Zudem kann vorteilhafterweise eine Erwärmung des Wechselakkupacks beim Betrieb reduziert werden, wodurch insbesondere eine Langlebigkeit, Betriebssicherheit und Effizienz des Wechselakkupacks gesteigert werden kann. Dies wird erfindungsgemäß erreicht durch einen Wechselakkupack für einen Verbraucher, insbesondere für ein Elektrowerkzeug, umfassend zumindest zwei Akkuzellen, zumindest einen Zellverbinder, und ein erstes Kontaktelement und ein zweites Kontaktelement. Die beiden Kontaktelemente sind zum elektrischen Anschluss des Wechselakkupacks ausgebildet. Das heißt, an den beiden Kontaktelementen kann die elektrische Energie an weitere Komponenten des Verbrauchers, beispielsweise einen Elektromotor, bereitgestellt werden. Vorzugsweise liegen an den beiden Kontaktelementen unterschiedliche elektrische Potenziale vor. Jede Akkuzelle des Wechselakkupacks ist mittels einer Verbindung mit dem zumindest einen Zellverbinder elektrisch leitend verbunden. Die Akkuzellen und der zumindest eine Zellverbinder und jede Verbindung sind dabei derart ausgebildet, dass ein gesamter AC-Innenwiderstand des Wechselakkupacks zwischen dem ersten Kontaktelementes und dem zweiten Kontaktelementes maximal 40 Milliohm beträgt. The interchangeable battery pack according to the invention with the features of claim 1 is characterized by a particularly high performance. In particular, higher power, preferably a larger electrical current, can be drawn from the interchangeable battery pack. In addition, heating of the interchangeable battery pack during operation can advantageously be reduced, whereby in particular the longevity, operational reliability and efficiency of the interchangeable battery pack can be increased. This is achieved according to the invention by an interchangeable battery pack for a consumer, in particular for a power tool, comprising at least two battery cells, at least one cell connector, and a first contact element and a second contact element. The two contact elements are designed for the electrical connection of the removable battery pack. This means that the electrical energy can be provided to other components of the consumer, for example an electric motor, at the two contact elements. Different electrical potentials are preferably present at the two contact elements. Each battery cell of the removable battery pack is electrically connected to the at least one cell connector by means of a connection. The battery cells and the at least one cell connector and each connection are designed in such a way that the total AC internal resistance of the removable battery pack between the first contact element and the second contact element is a maximum of 40 milliohms.

Als AC-Innenwiderstand wird dabei ein Wechselstrom-Innenwiderstand angesehen. Vorzugsweise wird ein derartiger AC-Innenwiderstand gemäß einem standardisierten Messverfahren, vorzugsweise nach DIN EN IEC 61960 ermittelt. An alternating current internal resistance is considered to be an AC internal resistance. Such an AC internal resistance is preferably determined according to a standardized measuring method, preferably according to DIN EN IEC 61960.

Alternativ oder zusätzlich bevorzugt können die Akkuzellen und der zumindest eine Zellverbinder und jede Verbindung des Wechselakkupacks derart ausgebildet sein, dass ein gesamter DC-Innenwiderstand maximal 12 Milliohm, bevorzugt maximal 9 Milliohm, insbesondere maximal 7 Milliohm, beträgt. Als DC-Innenwiderstand kann dabei ein Gleichstrom-Innenwiderstand angesehen werden. Vorzugsweise wird ein derartiger DC-Innenwiderstand gemäß einem standardisierten Verfahren, wie beispielsweise nach DIN EN IEC 61960 ermittelt werden. Alternatively or additionally, the battery cells and the at least one cell connector and each connection of the removable battery pack can be designed such that a total DC internal resistance is a maximum of 12 milliohms, preferably a maximum of 9 milliohms, in particular a maximum of 7 milliohms. A direct current internal resistance can be regarded as a DC internal resistance. Preferably, such a DC internal resistance is determined according to a standardized method, such as according to DIN EN IEC 61960.

Mit anderen Worten wird ein Wechselakkupack bereitgestellt, bei dem bevorzugt alle im Inneren des Wechselakkupacks an der Bereitstellung des elektrischen Stroms beteiligten Elemente derart ausgebildet und vorzugsweise aufeinander abgestimmt sind, dass ein gesamter AC-Innenwiderstand möglichst niedrig ist, im Detail maximal 40 Milliohm beträgt. Vorzugsweise kann dies auf vielfältige Weise ermöglicht werden, beispielsweise durch Bereitstellung von Akkuzellen mit niedrigem Innenwiderstand, durch Bereitstellung von Zellverbindern mit möglichst niedrigem elektrischen Widerstand, sowie durch Verbindungen die eine optimale Effizienz bei der Stromübertragung aufweisen. Der erfindungsgemäße Wechselakkupack bietet dabei den Vorteil, dass ein elektrischer Energiespeicher mit besonders hoher Leistung für Verbraucher, wie beispielsweise Elektrowerkzeuge, bereitgestellt werden kann. Dadurch, dass ein besonders niedriger AC-Innenwiderstand vorliegt, kann eine besonders hohe Leistungsabgabe des Wechselakkupacks ermöglicht werden. So können höhere Leistungen, insbesondere durch größere Ströme, aus dem Wechselakkupack entnommen werden. Gleichzeitig kann die Erwärmung des Wechselakkupacks, insbesondere der Akkuzellen, während des Betriebs reduziert werden. Dadurch kann zum einen die Lebensdauer und die Betriebssicherheit des Wechselakkupacks erhöht werden, und zum anderen kann die Effizienz der Akkuzellen weiter erhöht werden. In other words, a removable battery pack is provided in which preferably all elements inside the removable battery pack involved in providing the electrical current are designed and preferably coordinated with one another in such a way that the total AC internal resistance is as low as possible, in detail a maximum of 40 milliohms. This can preferably be made possible in a variety of ways, for example by providing battery cells with low internal resistance, by providing cell connectors with the lowest possible electrical resistance, and by connections that have optimal efficiency in power transmission. The interchangeable battery pack according to the invention offers the advantage that an electrical energy storage device with particularly high performance can be provided for consumers, such as power tools. The fact that there is a particularly low AC internal resistance enables a particularly high power output from the interchangeable battery pack. This means that higher power can be drawn from the interchangeable battery pack, in particular through larger currents. At the same time, the heating of the interchangeable battery pack, in particular of the battery cells, during operation can be reduced. This can increase the service life and operational reliability of the interchangeable battery pack on the one hand, and the efficiency of the battery cells can also be further increased.

Die Unteransprüche haben bevorzugte Weiterbildungen der Erfindung zum Inhalt. The subclaims contain preferred developments of the invention.

Bevorzugt sind die Akkuzellen und der zumindest eine Zellverbinder und jede Verbindung des Wechselakkupacks derart ausgebildet, dass der gesamte AC- Innenwiderstand des Wechselakkupacks maximal 30 Milliohm, insbesondere maximal 21 Milliohm beträgt. Dadurch kann ein besonders leistungsfähiger und effizienter Wechselakkupack bereitgestellt werden. Preferably, the battery cells and the at least one cell connector and each connection of the interchangeable battery pack are designed such that the total AC internal resistance of the interchangeable battery pack is a maximum of 30 milliohms, in particular a maximum of 21 milliohms. This makes it possible to provide a particularly powerful and efficient interchangeable battery pack.

Besonders bevorzugt sind mehrere Akkuzellen mittels des zumindest einen Zellverbinders elektrisch in Serie miteinander verbunden. Alternativ oder zusätzlich sind mehrere Akkuzellen mittels des zumindest einen Zellverbinders elektrisch parallel miteinander verbunden. Dadurch kann eine gesamte elektrische Kapazität, die durch den Wechselakkupack bereitgestellt werden kann, und/oder ein gesamter elektrischer Strom, der durch den Wechselakkupack bereitgestellt werden kann, flexibel angepasst werden. Particularly preferably, a plurality of battery cells are electrically connected to one another in series by means of the at least one cell connector. Alternatively or additionally, a plurality of battery cells are electrically connected to one another in parallel by means of the at least one cell connector. As a result, a total electrical capacity that can be provided by the interchangeable battery pack and/or a total electrical current that can be provided by the interchangeable battery pack can be flexibly adapted.

Bevorzugt sind jeweils fünf Akkuzellen elektrisch in Serie miteinander verbunden. Insbesondere liegt dabei eine ausschließlich serielle elektrische Verbindung der Akkuzellen vor. Das heißt, die Akkuzellen sind bevorzugt einlagig miteinander verschaltet. Beispielsweise kann eine derartige Konfiguration auch als 5s1p- Konfiguration des Wechselakkupacks bezeichnet werden. Beispielsweise kann dabei bei einer Verwendung von Akkuzellen, welche pro Akkuzelle eine Zellspannung von 3,6 V aufweisen, ein Wechselakkupack mit einer Gesamtspannung von 18 V bereitgestellt werden. Vorzugsweise sind dabei die Akkuzellen und der zumindest eine Zellverbinder und sämtliche Verbindungen des Wechselakkupack derart ausgebildet, dass der gesamte AC- Innenwiderstand maximal 21 Milliohm, bevorzugt maximal 16 Milliohm, insbesondere maximal 11 Milliohm, beträgt. Preferably, five battery cells are electrically connected to one another in series. In particular, the battery cells are electrically connected exclusively in series. This means that the battery cells are preferably connected to one another in a single layer. For example, such a configuration can also be referred to as a 5s1p configuration of the removable battery pack. For example, when using battery cells that have a cell voltage of 3.6 V per battery cell, a removable battery pack with a A total voltage of 18 V is provided. Preferably, the battery cells and the at least one cell connector and all connections of the interchangeable battery pack are designed such that the total AC internal resistance is a maximum of 21 milliohms, preferably a maximum of 16 milliohms, in particular a maximum of 11 milliohms.

Vorzugsweise sind jeweils fünf Akkuzellen elektrisch in Serie miteinander verbunden. Zusätzlich sind jeweils zwei Akkuzellen elektrisch parallel miteinander verbunden. Beispielsweise kann eine derartige Konfiguration auch als 5s2p-Konfiguration des Wechselakkupacks bezeichnet werden. Beispielsweise kann dabei bei einer Verwendung von Akkuzellen, welche pro Akkuzelle eine Zellspannung von 3,6 V aufweisen, ein Wechselakkupack mit einer Gesamtspannung von 18 V bereitgestellt werden. Vorzugsweise sind dabei die Akkuzellen und der zumindest eine Zellverbinder und sämtliche Verbindungen des Wechselakkupack derart ausgebildet, dass der gesamte AC- Innenwiderstand maximal 12 Milliohm, bevorzugt maximal 9 Milliohm, insbesondere maximal 6 Milliohm, beträgt. Preferably, five battery cells are electrically connected to one another in series. In addition, two battery cells are electrically connected to one another in parallel. For example, such a configuration can also be referred to as a 5s2p configuration of the removable battery pack. For example, when using battery cells that have a cell voltage of 3.6 V per battery cell, a removable battery pack with a total voltage of 18 V can be provided. Preferably, the battery cells and the at least one cell connector and all connections of the removable battery pack are designed such that the total AC internal resistance is a maximum of 12 milliohms, preferably a maximum of 9 milliohms, in particular a maximum of 6 milliohms.

Weiter bevorzugt sind jeweils fünf Akkuzellen elektrischen Serie miteinander verbunden. Zusätzlich sind jeweils drei Akkuzellen elektrisch parallel miteinander verbunden. Beispielsweise kann eine derartige Konfiguration auch als 5s3p- Konfiguration des Wechselakkupacks bezeichnet werden. Vorzugsweise sind dabei die Akkuzellen und der zumindest eine Zellverbinder und sämtliche Verbindungen des Wechselakkupacks derart ausgebildet, dass der gesamte AC- Innenwiderstand maximal 7 Milliohm, bevorzugt maximal 6 Milliohm, insbesondere maximal 4 Milliohm, beträgt. Damit kann ein besonders leistungsfähiger Wechselakkupack bereitgestellt werden. More preferably, five battery cells are connected to one another in electrical series. In addition, three battery cells are connected to one another in electrical parallel. For example, such a configuration can also be referred to as a 5s3p configuration of the removable battery pack. Preferably, the battery cells and the at least one cell connector and all connections of the removable battery pack are designed such that the total AC internal resistance is a maximum of 7 milliohms, preferably a maximum of 6 milliohms, in particular a maximum of 4 milliohms. This makes it possible to provide a particularly powerful removable battery pack.

Besonders bevorzugt sind die Akkuzellen als Lithium-Ionen-Akkuzellen ausgebildet. Besonders vorteilhaft ist eine Ausgestaltung der Akkuzellen in einer Multi-Laschen-Konfiguration, das heißt insbesondere mit einer Vielzahl an Laschen, welche den elektrischen Pol der Batteriezelle bilden oder mit diesem verbunden sind. Eine derartige Multi-Laschen-Konfiguration einer Lithium-Ionen- Akkuzelle bietet den Vorteil eines besonders geringen Innenwiderstands. Besonders vorteilhaft sind derartige Akkuzellen mit einem maximalen AC- Innenwiderstand von 8 Milliohm, bevorzugt e Milliohm, insbesondere 4 Milliohm, pro Akkuzelle. Dadurch kann ein Wechselakkupack mit besonders geringem gesamten AC-Innenwiderstand und somit besonders hoher Leistungsfähigkeit und Effizienz bereitgestellt werden. The battery cells are particularly preferably designed as lithium-ion battery cells. A design of the battery cells in a multi-tab configuration is particularly advantageous, that is to say in particular with a large number of tabs which form the electrical pole of the battery cell or are connected to it. Such a multi-tab configuration of a lithium-ion battery cell offers the advantage of a particularly low internal resistance. Such battery cells with a maximum AC internal resistance of 8 milliohms, preferably e milliohms, in particular 4 milliohms, are particularly advantageous. per battery cell. This makes it possible to provide a removable battery pack with a particularly low overall AC internal resistance and thus particularly high performance and efficiency.

Vorzugsweise sind die Akkuzellen zylindrisch ausgebildet und entlang einer Längsachse aneinander angrenzend und/oder radial nebeneinander angeordnet. Das heißt, es können mehrere Akkuzellen in axialer Richtung gestapelt angeordnet sein. Alternativ oder zusätzlich können in einer zur Längsachse orthogonalen Ebene mehrere Akkuzellen nebeneinanderliegend angeordnet sein. Dadurch kann ein flexibler und kompakter Aufbau des Wechselakkupacks bereitgestellt werden. Preferably, the battery cells are cylindrical and are arranged adjacent to one another along a longitudinal axis and/or radially next to one another. This means that several battery cells can be arranged stacked in the axial direction. Alternatively or additionally, several battery cells can be arranged next to one another in a plane orthogonal to the longitudinal axis. This makes it possible to provide a flexible and compact structure for the interchangeable battery pack.

Besonders bevorzugt sind die Akkuzellen im Format 21700 ausgebildet. The battery cells are particularly preferably in 21700 format.

Besonders bevorzugt ist die Verbindung eine stoffschlüssige Verbindung, vorzugsweise eine Laserschweißverbindung, oder eine Widerstandsschweißverbindung, oder eine Bondverbindung, oder eine Lötverbindung. Dadurch kann bei einfacher und kostengünstiger Herstellbarkeit eine elektrisch leitende Verbindung zwischen Akkuzellen und Zellverbinder mit niedrigem elektrischen Widerstand bereitgestellt werden. The connection is particularly preferably a material connection, preferably a laser welded connection, or a resistance welded connection, or a bonded connection, or a soldered connection. This makes it possible to provide an electrically conductive connection between battery cells and cell connectors with low electrical resistance while being easy and cost-effective to manufacture.

Bevorzugt weist die Verbindung mehrere Kontaktpunkte pro Pol jeder Akkuzelle auf. An den Kontaktpunkten sind die Akkuzellen dabei elektrisch leitend mit dem Zellverbinder verbunden. Damit können definierte Verbindungspunkte zwischen Zellverbinder und Akkuzelle bereitgestellt werden, was sich vorteilhaft auf eine mechanische Verbindung von Zellverbinder und Akkuzelle sowie auf einen geringen elektrischen Widerstand und eine einfache und kostengünstige Herstellbarkeit auswirkt. The connection preferably has several contact points per pole of each battery cell. The battery cells are electrically connected to the cell connector at the contact points. This makes it possible to provide defined connection points between the cell connector and the battery cell, which has an advantageous effect on a mechanical connection between the cell connector and the battery cell, as well as on low electrical resistance and simple and cost-effective manufacture.

Weiter bevorzugt sind sämtliche Kontaktpunkte der Verbindung in mindestens einem vorbestimmten ersten Abstand von einem Mittelpunkt des jeweiligen Pols der entsprechenden Akkuzelle angeordnet. Vorzugsweise liegt jeder Pol dabei an einer axialen Stirnseite der entsprechenden Akkuzelle. Insbesondere entspricht der Mittelpunkt dabei einem Zentrum der vorzugsweise kreisrunden Stirnseite. Mit anderen Worten ist eine Verbotszone definiert, welche einem Bereich mit einem dem ersten Abstand entsprechenden Radius entspricht, innerhalb welcher keiner der Kontaktpunkte angeordnet ist. Mit anderen Worten sind die Kontaktpunkte breit über den Zell-Querschnitt verteilt. Dadurch kann ein optimaler Stromfluss von der Akkuzelle zum Zellverbinder und somit ein geringer Übergangswiderstand bereitgestellt werden, wodurch besonders vorteilhaft der niedrige AC-Innenwiderstand des Wechselakkupacks ermöglicht werden kann. Further preferably, all contact points of the connection are arranged at at least a predetermined first distance from a center point of the respective pole of the corresponding battery cell. Preferably, each pole is located on an axial end face of the corresponding battery cell. In particular, the center point corresponds to a center of the preferably circular end face. In other words, a prohibition zone is defined which corresponds to an area with a radius corresponding to the first distance, within which none of the contact points are arranged. In other words, the contact points are distributed widely across the cell cross-section. This allows for an optimal flow of current from the battery cell to the cell connector and thus a low contact resistance, which makes it particularly advantageous to enable the low AC internal resistance of the interchangeable battery pack.

Besonders bevorzugt beträgt der erste Abstand am Pluspol mindestens 2 mm, bevorzugt mindestens 3 mm. Alternativ oder zusätzlich bevorzugt beträgt der erste Abstand am Minuspol mindestens 3 mm, insbesondere mindestens 4 mm. Vorteilhafterweise kann somit am größeren Minuspol ein größerer Abstand der Kontaktpunkt der vom Mittelpunkt ermöglicht werden, also eine breitere Verteilung der Kontaktpunkt über den Pol. Particularly preferably, the first distance at the positive pole is at least 2 mm, preferably at least 3 mm. Alternatively or additionally, the first distance at the negative pole is at least 3 mm, in particular at least 4 mm. Advantageously, this allows a greater distance between the contact point and the center point at the larger negative pole, i.e. a wider distribution of the contact point over the pole.

Vorzugsweise sind sämtliche Kontaktpunkte in mindestens einem vorbestimmten zweiten Abstand voneinander angeordnet. Bevorzugt beträgt der zweite Abstand mindestens 2 mm, insbesondere mindestens 3 mm. Das heißt, sämtliche der Kontaktpunkte weisen auch untereinander einen vorbestimmten Mindestabstand auf, um eine breite Verteilung der Kontaktpunkte über die Fläche des jeweiligen Pols der Akkuzelle sicherzustellen. Damit kann weiterhin ein optimaler Stromfluss und ein geringer Übergangswiderstand begünstigt werden. Preferably, all contact points are arranged at at least a predetermined second distance from one another. The second distance is preferably at least 2 mm, in particular at least 3 mm. This means that all of the contact points also have a predetermined minimum distance from one another in order to ensure a broad distribution of the contact points over the surface of the respective pole of the battery cell. This can also promote optimal current flow and low contact resistance.

Bevorzugt ist der zumindest eine Zellverbinder als Blech ausgebildet, welches vorzugsweise eine Dicke von mindestens 0,1 mm, bevorzugt von mindestens 0,2 mm, insbesondere maximal 0,5 mm, und bevorzugt eine Querschnittsfläche von mindestens 0,5 mm2, vorzugsweise mindestens 4 mm2, insbesondere maximal 15 mm2, aufweist. Besonders bevorzugt ist das Blech, also der Zellverbinder, aus Kupfer oder einer Kupferlegierung oder aus Stahl gebildet. Damit kann eine effiziente Stromübertragung durch den Zellverbinder bereitgestellt werden, um den niedrigen AC-Innenwiderstand zu ermöglichen. Preferably, the at least one cell connector is designed as a sheet metal, which preferably has a thickness of at least 0.1 mm, preferably of at least 0.2 mm, in particular a maximum of 0.5 mm, and preferably a cross-sectional area of at least 0.5 mm 2 , preferably at least 4 mm 2 , in particular a maximum of 15 mm 2 . The sheet metal, i.e. the cell connector, is particularly preferably made of copper or a copper alloy or of steel. This enables efficient current transmission through the cell connector to be provided in order to enable the low AC internal resistance.

Vorzugsweise weist der Zellverbinder einen Kontaktbereich auf, an welchem die Kontaktpunkte angeordnet sind, und einen Grundbereich, der mit dem Kontaktbereich verbunden ist. Bevorzugt sind der Kontaktbereich und der Grundbereich gemeinsam als ein einstückiges Bauteil ausgebildet. Dabei ist der Grundbereich bezüglich der Axialrichtung in einem vorbestimmten dritten Abstand zum Kontaktbereich angeordnet. Mit anderen Worten sind Grundbereich und Kontaktbereich in Axialrichtung der Akkuzelle versetzt zueinander angeordnet, insbesondere derart, dass der Kontaktbereich näher am Pol der Akkuzelle als der Grundbereich angeordnet ist. Beispielsweise kann dies mittels einer Kröpfung zwischen Grundbereich und Kontaktbereich bereitgestellt werden. Dadurch kann bei besonders einfacher und kostengünstiger Geometrie des Zellverbinders eine definierte Ausgestaltung bereitgestellt werden, welche zuverlässig den elektrischen Kontakt ausschließlich am Kontaktbereich sicherstellt. Beispielsweise kann dadurch auch ein gewisser Abstand zwischen Grundbereich und Pol sichergestellt werden, sodass ein unabsichtlicher Kontakt zum Pol vermieden werden kann. The cell connector preferably has a contact region on which the contact points are arranged, and a base region which is connected to the contact region. The contact region and the base region are preferably formed together as a one-piece component. The base region is arranged at a predetermined third distance from the contact region with respect to the axial direction. In other words, the base region and contact area are arranged offset from one another in the axial direction of the battery cell, in particular such that the contact area is arranged closer to the pole of the battery cell than the base area. For example, this can be provided by means of a bend between the base area and the contact area. This makes it possible to provide a defined design with a particularly simple and cost-effective geometry of the cell connector, which reliably ensures electrical contact exclusively at the contact area. For example, this can also ensure a certain distance between the base area and the pole, so that unintentional contact with the pole can be avoided.

Weiterhin führt die Erfindung zu einem Verbraucher, insbesondere einem Elektrowerkzeug, umfassend den beschriebenen Wechselakkupack. Furthermore, the invention leads to a consumer, in particular a power tool, comprising the described interchangeable battery pack.

Vorzugsweise umfasst der Verbraucher zumindest einen Elektromotor, wobei der Wechselakkupack eingerichtet ist zur Bereitstellung elektrischer Energie für den zumindest einen Elektromotor. Preferably, the consumer comprises at least one electric motor, wherein the removable battery pack is configured to provide electrical energy for the at least one electric motor.

Kurze Beschreibung der Zeichnungen Short description of the drawings

Im Folgenden wird die Erfindung anhand von Ausführungsbeispielen in Verbindung mit den Figuren beschrieben. In den Figuren sind funktional gleiche Bauteile jeweils mit gleichen Bezugszeichen gekennzeichnet. Dabei zeigt: The invention is described below using exemplary embodiments in conjunction with the figures. In the figures, functionally identical components are each identified with the same reference numerals. In the following:

Figur 1 eine perspektivische Ansicht eines Wechselakkupacks gemäß einem ersten Ausführungsbeispiel der Erfindung, Figure 1 is a perspective view of a removable battery pack according to a first embodiment of the invention,

Figur 2 eine Detailansicht des Wechselakkupacks der Figur 1 , Figure 2 is a detailed view of the removable battery pack of Figure 1,

Figur 3 ein vergrößertes Detail der Figur 2, und Figure 3 is an enlarged detail of Figure 2, and

Figur 4 eine Detailansicht eines Wechselakkupacks gemäß einem zweiten Ausführungsbeispiel der Erfindung. Figure 4 is a detailed view of an interchangeable battery pack according to a second embodiment of the invention.

Bevorzugte Ausführungsformen der Erfindung Die Figur 1 zeigt eine perspektivische Ansicht eines Wechselakkupacks 1 gemäß einem ersten Ausführungsbeispiel der Erfindung. In Figur 2 und 3 sind Detailansichten des Wechselakkupacks 1 der Figur 1 dargestellt. Preferred embodiments of the invention Figure 1 shows a perspective view of a removable battery pack 1 according to a first embodiment of the invention. Figures 2 and 3 show detailed views of the removable battery pack 1 of Figure 1.

Der Wechselakkupack 1 dient als elektrischer Energiespeicher für einen (nicht dargestellten) Verbraucher, wie beispielsweise ein, vorzugsweise von Hand führbares, Elektrowerkzeug. Vorzugsweise kann dabei zumindest ein Elektromotor des Verbrauchers mittels der im Wechselakkupack 1 gespeicherten elektrischen Energie versorgt werden. Der Wechselakkupack 1 ist dabei mittels eines nicht näher beschriebenen Verbindungsmechanismus mit einem Werkzeugteil des Verbrauchers lösbar verbindbar. Dadurch kann der Wechselakkupack 1 beispielsweise durch einen baugleichen Wechselakkupack 1 ausgewechselt werden. The interchangeable battery pack 1 serves as an electrical energy storage device for a consumer (not shown), such as a power tool, preferably one that can be operated by hand. Preferably, at least one electric motor of the consumer can be supplied with the electrical energy stored in the interchangeable battery pack 1. The interchangeable battery pack 1 can be detachably connected to a tool part of the consumer by means of a connection mechanism that is not described in more detail. This means that the interchangeable battery pack 1 can be replaced, for example, with an identical interchangeable battery pack 1.

Eine elektrische Verbindung zwischen Wechselakkupack 1 und den weiteren Komponenten, wie dem Elektromotor, des Verbrauchers erfolgt mittels Kontaktelementen 11 , 12 am Wechselakkupack 1. Vorzugsweise liegt an den beiden Kontaktelementen 11 , 12 dabei ein unterschiedliches elektrisches Potenzial an. An electrical connection between the removable battery pack 1 and the other components, such as the electric motor, of the consumer is made by means of contact elements 11, 12 on the removable battery pack 1. Preferably, a different electrical potential is present at the two contact elements 11, 12.

Der Wechselakkupack 1 umfasst ferner mehrere Akkuzellen 2, sowie mehrere Zellverbinder 4 (vgl. Figur 2). Die Akkuzellen 2 und Zellverbinder 4 sind innerhalb eines Gehäuses 50 (vgl. Figur 1), welches zum Schutz vorgesehen ist, aufgenommen. Die Akkuzellen 2 können zudem mittels eines Zellhalters 60 relativ zueinander in Position gehalten werden. The interchangeable battery pack 1 further comprises several battery cells 2 and several cell connectors 4 (see Figure 2). The battery cells 2 and cell connectors 4 are accommodated within a housing 50 (see Figure 1), which is provided for protection. The battery cells 2 can also be held in position relative to one another by means of a cell holder 60.

Die Akkuzellen 2 sind als zylindrische Lithium-Ionen-Zellen im Format 21700 ausgebildet. Im Wechselakkupack 1 sind sämtliche Akkuzellen 2 parallel zueinander, das heißt parallel zu einer Längsachse 15, angeordnet. The battery cells 2 are designed as cylindrical lithium-ion cells in the 21700 format. In the removable battery pack 1, all battery cells 2 are arranged parallel to one another, i.e. parallel to a longitudinal axis 15.

Mittels der Zellverbinder 4 sind jeweils mehrere Akkuzellen 2 elektrisch miteinander verbunden. Die Zellverbinder 4 sind dabei als Kupfer-Bleche ausgebildet, welche vorzugsweise eine Dicke von mindestens 0,1 mm, und insbesondere eine Querschnittsfläche von mindestens 1 mm2 aufweisen. Der Wechselakkupack 1 des ersten Ausführungsbeispiels umfasst insgesamt 15 Akkuzellen 2, welche mittels der Zellverbinder 4 derart elektrisch miteinander verbunden sind, um eine sogenannte 5s3p-Konfiguration bereitzustellen. Das heißt, es sind jeweils fünf Akkuzellen 2 elektrisch in Serie miteinander verbunden, und gleichzeitig sind jeweils drei Akkuzellen 2 elektrisch parallel miteinander verbunden. A plurality of battery cells 2 are electrically connected to one another by means of the cell connectors 4. The cell connectors 4 are designed as copper sheets, which preferably have a thickness of at least 0.1 mm and in particular a cross-sectional area of at least 1 mm 2 . The interchangeable battery pack 1 of the first embodiment comprises a total of 15 battery cells 2, which are electrically connected to one another by means of the cell connectors 4 in such a way as to provide a so-called 5s3p configuration. This means that five battery cells 2 are electrically connected to one another in series, and at the same time three battery cells 2 are electrically connected to one another in parallel.

Über die Zellverbinder 4 sind die Akkuzellen 2 dabei mit den beiden Kontaktelementen 11 , 12 elektrisch verbunden. The battery cells 2 are electrically connected to the two contact elements 11, 12 via the cell connectors 4.

An den beiden axialen Stirnseiten der Akkuzellen 2 sind die jeweiligen unterschiedlichen Pole 21 , 31, nämlich Pluspol 21 und Minuspol 31, der Akkuzellen 2 angeordnet. Jeder Pol 21 , 31 ist dabei mittels einer Verbindung 5 elektrisch leitend mit einem der Zellverbinder 4 verbunden. Jede Verbindung 5 weist dabei vorzugsweise mehrere Widerstandsschweißverbindungen auf. The respective different poles 21, 31, namely positive pole 21 and negative pole 31, of the battery cells 2 are arranged on the two axial end faces of the battery cells 2. Each pole 21, 31 is electrically connected to one of the cell connectors 4 by means of a connection 5. Each connection 5 preferably has several resistance welded connections.

An den Pluspolen 21 sind die Zellverbinder 4 vorzugsweise derart ausgebildet, dass diese einen Kontaktbereich 41 aufweisen, welcher bevorzugt kreisrund, und insbesondere konzentrisch zum Pluspol 21 ausgebildet ist. Zudem umfassen die Zellverbinder 4 am Pluspol 21 einen Grundbereich 42, der den Kontaktbereich 41 umgibt. Bezüglich der Richtung der Längsachse 15 ist der Kontaktbereich 41 dabei in einem vorbestimmten Abstand, von beispielsweise mindestens 0,5 mm, zum Grundbereich 42 näher am Pluspol 21 angeordnet. At the positive poles 21, the cell connectors 4 are preferably designed such that they have a contact region 41 which is preferably circular and in particular concentric to the positive pole 21. In addition, the cell connectors 4 at the positive pole 21 comprise a base region 42 which surrounds the contact region 41. With respect to the direction of the longitudinal axis 15, the contact region 41 is arranged closer to the positive pole 21 at a predetermined distance, for example of at least 0.5 mm, from the base region 42.

An jedem Pol 21, 31 weist die entsprechende Verbindung 5 mehrere Kontaktpunkte 51 auf, an denen der entsprechende Pol 21 , 31 der Akkuzelle mit dem Zellverbinder 4 elektrisch leitend verbunden ist. An jedem der Kontaktpunkte 51 ist dabei eine separate Widerstandsschweißverbindung vorgesehen. At each pole 21, 31, the corresponding connection 5 has several contact points 51, at which the corresponding pole 21, 31 of the battery cell is electrically connected to the cell connector 4. A separate resistance welding connection is provided at each of the contact points 51.

Im dargestellten Ausführungsbeispiel sind pro Pol 21 , 31 genau vier Kontaktpunkte 51 vorgesehen. Alternativ bevorzugt kann auch eine andere Anzahl an Kontaktpunkten 51 vorgesehen sein, beispielsweise genau zwei Kontaktpunkte 51. Die Kontaktpunkte 51 sind dabei derart angeordnet, dass diese mindestens in einem vorbestimmten ersten Abstand 52 von einem Mittelpunkt 25 des jeweiligen Pols 21 , 31 angeordnet sind (vgl. Figur 3). In the illustrated embodiment, exactly four contact points 51 are provided per pole 21, 31. Alternatively, a different number of contact points 51 can also be provided, for example exactly two contact points 51. The contact points 51 are arranged such that they are arranged at least at a predetermined first distance 52 from a center point 25 of the respective pole 21, 31 (see Figure 3).

Der erste Abstand 52 beträgt vorzugsweise mindestens 3 mm am Pluspol 21. Am Minuspol 31 kann eine breitere Verteilung der Kontaktpunkte 51 ermöglicht werden, sodass der erste Abstand 52 am Minuspol 31 vorzugsweise mindestens 4 mm beträgt. Mit anderen Worten ist somit eine Verbotszone um den Mittelpunkt 25 des jeweiligen Pols 21, 31 definiert, innerhalb welchem keiner der Kontaktpunkte 51 angeordnet ist. The first distance 52 is preferably at least 3 mm at the positive pole 21. A wider distribution of the contact points 51 can be made possible at the negative pole 31, so that the first distance 52 at the negative pole 31 is preferably at least 4 mm. In other words, a prohibited zone is defined around the center point 25 of the respective pole 21, 31, within which none of the contact points 51 is arranged.

Zusätzlich sind sämtliche Kontaktpunkte 51 in mindestens einem vorbestimmten zweiten Abstand 53 jeweils voneinander angeordnet. Der zweite Abstand 53 beträgt dabei mindestens 3 mm. In addition, all contact points 51 are arranged at least a predetermined second distance 53 from each other. The second distance 53 is at least 3 mm.

Durch die Anordnung der Kontaktpunkte 51 entsprechend den vorbestimmten Abständen 52, 53 kann eine möglichst breite bzw. großflächige Verteilung der Kontaktpunkte 51 über den jeweiligen Pol 21, 31 erfolgen. Insbesondere kann somit ein möglichst breit über den Pol 21, 31 verteilter Stromabgriff erfolgen, sodass ein optimaler Stromfluss von der Akkuzelle 2 zum Zellverbinder 4 mit einem möglichst geringen Übergangswiderstand bereitgestellt werden kann. By arranging the contact points 51 according to the predetermined distances 52, 53, the contact points 51 can be distributed as widely or as extensively as possible over the respective pole 21, 31. In particular, current can be tapped as widely as possible over the pole 21, 31, so that an optimal current flow from the battery cell 2 to the cell connector 4 can be provided with the lowest possible contact resistance.

Im gezeigten Ausführungsbeispiel sind die Zellverbinder 4 geschlitzt ausgebildet. Dadurch kann eine vereinfachte Herstellung der Verbindungen 5 mittels Widerstandsschweißen ermöglicht werden. Insbesondere bei Verwendung einer alternativen Verbindungsmethode können beispielsweise auch Zellverbinder 4 ohne Schlitz vorgesehen sein. In the embodiment shown, the cell connectors 4 are slotted. This makes it possible to produce the connections 5 more easily by means of resistance welding. In particular, when using an alternative connection method, cell connectors 4 without a slot can also be provided.

Bei dem Wechselakkupack 1 sind dabei die Akkuzellen 2, die Zellverbinder 4 und sämtliche Verbindungen 5 speziell derart ausgebildet, dass ein gesamter AC- Innenwiderstand des gesamten Wechselakkupacks 1 maximal 7 Milliohm beträgt. Der gesamte AC-Innenwiderstand des Wechselakkupacks 1 ist dabei zwischen dem ersten Kontaktelement 11 und dem zweiten Kontaktelementes 12 definiert. In the exchangeable battery pack 1, the battery cells 2, the cell connectors 4 and all connections 5 are specially designed in such a way that the total AC internal resistance of the entire exchangeable battery pack 1 is a maximum of 7 milliohms. The total AC internal resistance of the exchangeable battery pack 1 is defined between the first contact element 11 and the second contact element 12.

Damit kann der Wechselakkupack 1 mit einer besonders hohen Leistungsfähigkeit bereitgestellt werden. Insbesondere kann eine besonders hohe Leistungsabgabe an beispielsweise weitere Komponenten des Verbrauchers ermöglicht werden. Im Detail können hohe Leistungen, beispielsweise durch größere Ströme, aus dem Wechselakkupack 1 entnommen werden. Gleichzeitig kann die Erwärmung des Wechselakkupacks 1 niedrig gehalten werden, wodurch auch die Lebensdauer des Wechselakkupacks 1 erhöht werden kann. This means that the exchangeable battery pack 1 can be provided with a particularly high performance. In particular, a particularly high power output to other components of the consumer can be made possible, for example. In detail, high power can be drawn from the removable battery pack 1, for example through larger currents. At the same time, the heating of the removable battery pack 1 can be kept low, which can also increase the service life of the removable battery pack 1.

Figur 4 zeigt eine Detailansicht eines Wechselakkupacks 1 gemäß einem zweiten Ausführungsbeispiel der Erfindung. Das zweite Ausführungsbeispiel entspricht im Wesentlichen dem ersten Ausführungsbeispiel der Figuren 1 bis 3, mit dem Unterschied einer alternativen Anzahl an Akkuzellen 2. Im zweiten Ausführungsbeispiel umfasst der Wechselakkupack 1 insgesamt fünf Akkuzellen 2, wobei sämtliche Akkuzellen 2 elektrisch in Serie miteinander mittels der Zellverbinder 4 verbunden sind. Das heißt, der Wechselakkupack 1 des zweiten Ausführungsbeispiels ist in einer sogenannten 5s1p-Konfiguration ausgebildet. Figure 4 shows a detailed view of a removable battery pack 1 according to a second embodiment of the invention. The second embodiment essentially corresponds to the first embodiment of Figures 1 to 3, with the difference of an alternative number of battery cells 2. In the second embodiment, the removable battery pack 1 comprises a total of five battery cells 2, with all battery cells 2 being electrically connected in series with one another by means of the cell connectors 4. This means that the removable battery pack 1 of the second embodiment is designed in a so-called 5s1p configuration.

Dadurch kann ein Wechselakkupack 1 mit alternativer elektrischer Kapazität bereitgestellt werden, wobei vorteilhafterweise eine besonders kompakte Konstruktion ermöglicht werden kann. This makes it possible to provide an exchangeable battery pack 1 with alternative electrical capacity, whereby a particularly compact design can advantageously be made possible.

Im zweiten Ausführungsbeispiel liegt durch die geringere Anzahl an Akkuzellen 2 im Vergleich zum ersten Ausführungsbeispiel inhärent ein größerer AC- Innenwiderstand vor. Insbesondere sind im zweiten Ausführungsbeispiel die Akkuzellen 2, die Zellverbinder 4, sowie sämtliche Verbindungen 5 derart ausgebildet, um einen gesamten AC-Innenwiderstand des Wechselakkupack 1 von maximal 21 Milliohm bereitzustellen. Dadurch kann bei beispielsweise gegebener Anzahl der Akkuzellen 2 und/oder vorgegebener geometrische Größe eine optimale Leistungsfähigkeit des Wechselakkupacks 1 bereitgestellt werden. In the second embodiment, there is an inherently greater AC internal resistance due to the smaller number of battery cells 2 compared to the first embodiment. In particular, in the second embodiment, the battery cells 2, the cell connectors 4, and all connections 5 are designed in such a way as to provide a total AC internal resistance of the interchangeable battery pack 1 of a maximum of 21 milliohms. This means that, for example, with a given number of battery cells 2 and/or a given geometric size, an optimal performance of the interchangeable battery pack 1 can be provided.

Claims

Ansprüche claims 1. Wechselakkupack für einen Verbraucher, insbesondere für ein Elektrowerkzeug, umfassend: 1. Replaceable battery pack for a consumer, in particular for a power tool, comprising: - zumindest zwei Akkuzellen (2), - at least two battery cells (2), - zumindest einen Zellverbinder (4), und - at least one cell connector (4), and - ein erstes Kontaktelement (11) und ein zweites Kontaktelement (12) zum elektrischen Anschluss des Wechselakkupacks (1), - a first contact element (11) and a second contact element (12) for the electrical connection of the exchangeable battery pack (1), - wobei jede Akkuzelle (2) mittels einer Verbindung (5) mit dem zumindest einen Zellverbinder (4) elektrisch leitend verbunden ist, und - wherein each battery cell (2) is electrically connected to the at least one cell connector (4) by means of a connection (5), and - wobei die Akkuzellen (2) und der zumindest eine Zellverbinder (4) und jede Verbindung (5) derart ausgebildet ist, dass ein gesamter AC-Innenwiderstand des Wechselakkupacks (1) zwischen dem ersten Kontaktelement (11) und dem zweiten Kontaktelement (12) maximal 40 Milliohm beträgt. - wherein the battery cells (2) and the at least one cell connector (4) and each connection (5) are designed such that a total AC internal resistance of the interchangeable battery pack (1) between the first contact element (11) and the second contact element (12) is a maximum of 40 milliohms. 2. Wechselakkupack nach Anspruch 1, wobei die Akkuzelle (2) und der zumindest eine Zellverbinder (4) und jede Verbindung (5) derart ausgebildet ist, dass der gesamte AC-Innenwiderstand maximal 30 Milliohm, insbesondere maximal 21 Milliohm, beträgt. 2. Exchangeable battery pack according to claim 1, wherein the battery cell (2) and the at least one cell connector (4) and each connection (5) are designed such that the total AC internal resistance is a maximum of 30 milliohms, in particular a maximum of 21 milliohms. 3. Wechselakkupack nach einem der vorhergehenden Ansprüche, wobei mehrere Akkuzellen (2) durch den zumindest einen Zellverbinder (4) elektrisch in Serie und/oder elektrisch parallel miteinander verbunden sind. 3. Exchangeable battery pack according to one of the preceding claims, wherein a plurality of battery cells (2) are electrically connected to one another in series and/or electrically in parallel by the at least one cell connector (4). 4. Wechselakkupack nach Anspruch 3, wobei jeweils fünf Akkuzellen (2) in Serie miteinander verbunden sind, insbesondere wobei der AC-Innenwiderstand maximal 21 Milliohm, bevorzugt maximal 16 Milliohm, insbesondere maximal 11 Milliohm, beträgt. 4. Exchangeable battery pack according to claim 3, wherein five battery cells (2) are connected to one another in series, in particular wherein the AC internal resistance is a maximum of 21 milliohms, preferably a maximum of 16 milliohms, in particular a maximum of 11 milliohms. 5. Wechselakkupack nach Anspruch 3, wobei jeweils fünf Akkuzellen (2) in Serie und jeweils zwei Akkuzellen (2) parallel miteinander verbunden sind, insbesondere wobei der AC-Innenwiderstand maximal 12 Milliohm, bevorzugt maximal 9 Milliohm, insbesondere maximal 6 Milliohm, beträgt. 5. Exchangeable battery pack according to claim 3, wherein five battery cells (2) are connected in series and two battery cells (2) are connected in parallel, in particular wherein the AC internal resistance is a maximum of 12 milliohms, preferably a maximum of 9 milliohms, in particular a maximum of 6 milliohms. 6. Wechselakkupack nach Anspruch 3, wobei jeweils fünf Akkuzellen (2) in Serie und jeweils drei Akkuzellen (2) parallel miteinander verbunden sind, insbesondere wobei der AC-Innenwiderstand maximal 7 Milliohm, bevorzugt maximal 6 Milliohm, insbesondere maximal 4 Milliohm, beträgt. 6. Exchangeable battery pack according to claim 3, wherein five battery cells (2) are connected in series and three battery cells (2) are connected in parallel, in particular wherein the AC internal resistance is a maximum of 7 milliohms, preferably a maximum of 6 milliohms, in particular a maximum of 4 milliohms. 7. Wechselakkupack nach einem der vorhergehenden Ansprüche, wobei die Akkuzellen (2) als Lithium-Ionen-Akkuzellen ausgebildet sind. 7. Exchangeable battery pack according to one of the preceding claims, wherein the battery cells (2) are designed as lithium-ion battery cells. 8. Wechselakkupack nach einem der vorhergehenden Ansprüche, wobei die Verbindung (5) eine stoffschlüssige Verbindung ist, insbesondere eine Laserschweißverbindung, oder eine Widerstandsschweißverbindung, oder eine Bondverbindung, oder eine Lötverbindung. 8. Exchangeable battery pack according to one of the preceding claims, wherein the connection (5) is a material-locking connection, in particular a laser-welded connection, or a resistance-welded connection, or a bonded connection, or a soldered connection. 9. Wechselakkupack nach einem der vorhergehenden Ansprüche, wobei die Verbindung (5) mehrere Kontaktpunkte (51) pro Pol (21 , 31) jeder Akkuzelle (2) aufweist, wobei die Akkuzellen (2) an den Kontaktpunkten (51) mit dem Zellverbinder (4) elektrisch leitend verbunden sind. 9. Exchangeable battery pack according to one of the preceding claims, wherein the connection (5) has several contact points (51) per pole (21, 31) of each battery cell (2), wherein the battery cells (2) are electrically conductively connected to the cell connector (4) at the contact points (51). 10. Wechselakkupack nach Anspruch 9, wobei sämtliche Kontaktpunkte (51) in mindestens einem vorbestimmten ersten Abstand (52) von einem Mittelpunkt (25) des jeweiligen Pols (21 , 31) angeordnet ist. 10. Exchangeable battery pack according to claim 9, wherein all contact points (51) are arranged at least a predetermined first distance (52) from a center point (25) of the respective pole (21, 31). 11. Wechselakkupack nach Anspruch 10, wobei der erste Abstand (52) am Pluspol (21) mindestens 2 mm, bevorzugt mindestens 3 mm, beträgt, und/oder wobei der erste Abstand (52) am Minuspol (31) mindestens 3 mm, insbesondere mindestens 4 mm, beträgt. 11. Exchangeable battery pack according to claim 10, wherein the first distance (52) at the positive pole (21) is at least 2 mm, preferably at least 3 mm, and/or wherein the first distance (52) at the negative pole (31) is at least 3 mm, in particular at least 4 mm. 12. Wechselakkupack nach Anspruch 10 oder 11, wobei sämtliche Kontaktpunkte (51) in mindestens einem vorbestimmten zweiten Abstand (53) voneinander angeordnet sind, insbesondere wobei der zweite Abstand (53) mindestens 2 mm, vorzugsweise mindestens 3 mm, beträgt. 12. Exchangeable battery pack according to claim 10 or 11, wherein all contact points (51) are at least a predetermined second distance (53) from each other are arranged, in particular wherein the second distance (53) is at least 2 mm, preferably at least 3 mm. 13. Wechselakkupack nach einem der vorhergehenden Ansprüche, wobei der zumindest eine Zellverbinder (4) als Blech ausgebildet ist, das vorzugsweise eine13. Exchangeable battery pack according to one of the preceding claims, wherein the at least one cell connector (4) is designed as a sheet metal, which preferably has a Dicke von mindestens 0,1 mm, vorzugsweise mindestens 0,2 mm, insbesondere maximal 0,5 mm, bevorzugt eine Querschnittsfläche von mindestens 0,5 mm2, vorzugsweise mindestens 4 mm2, insbesondere maximal 15 mm2, aufweist, und das besonders bevorzugt aus Kupfer oder einer Kupferlegierung oder Stahl gebildet ist. Thickness of at least 0.1 mm, preferably at least 0.2 mm, in particular a maximum of 0.5 mm, preferably a cross-sectional area of at least 0.5 mm 2 , preferably at least 4 mm 2 , in particular a maximum of 15 mm 2 , and which is particularly preferably formed from copper or a copper alloy or steel. 14. Wechselakkupack nach Anspruch 13, wobei jeder Zellverbinder (4) einen Kontaktbereich (41), an dem die Kontaktpunkte (51) angeordnet sind, und einen Grundbereich (42), der mit dem Kontaktbereich (41) verbunden ist, aufweist, und wobei der Grundbereich (42) bezüglich der Axialrichtung in einem vorbestimmten dritten Abstand angeordnet ist. 14. Exchangeable battery pack according to claim 13, wherein each cell connector (4) has a contact region (41) on which the contact points (51) are arranged, and a base region (42) which is connected to the contact region (41), and wherein the base region (42) is arranged at a predetermined third distance with respect to the axial direction. 15. Verbraucher, insbesondere Elektrowerkzeug, umfassend ein Wechselakkupack (1) nach einem der vorhergehenden Ansprüche. 15. Consumer, in particular power tool, comprising a removable battery pack (1) according to one of the preceding claims.
PCT/EP2024/065415 2023-06-07 2024-06-05 Interchangeable rechargeable battery pack for a consumer Ceased WO2024251782A1 (en)

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