Electric battery pack, process and electric battery system

Abstract

The invention relates to an electric battery pack (1) for an electric battery system (100), wherein the electric battery pack (1) comprises: a substantially cylindrical electric battery cell (2) which extends axially along a cell height direction (Z) and which has two electrical cell contact sections (3), at least one electrically conductive connecting device (30) for conducting electrical current to one of the two cell contact sections (3) and / or away from one of the two cell contact sections (3), wherein the connecting device (30) comprises: an electrically conductive contacting section (4) for electrically contacting one of the two cell contact sections (3), wherein the contacting section (4) is electrically and directly mechanically connected to one of the two cell contact sections (3),and an electrically conductive connecting section (5) for conducting electrical current to and / or away from the contacting section (4), wherein the contacting section (4) electrically and indirectly mechanically connects the connecting section (5) to one of the two cell contact sections (3); wherein the contacting section (4) has a contacting section thickness (7), wherein the connecting section (5) has a connecting section thickness (8), wherein the contacting section thickness (7) is smaller than the connecting section thickness (8).

Description

FIELD OF APPLICATION AND PRIOR ARTThe invention relates to an electric rechargeable battery pack for an electric rechargeable battery system. The invention also relates to a method for producing an electrical rechargeable battery pack of this type. The invention also relates to an electric battery system having an electric battery pack of this type.OBJECT AND SOLUTIONIt is an object of the present invention to provide an electric rechargeable battery pack for an electric rechargeable battery system, a method for producing an electric rechargeable battery pack of this type, and an electric rechargeable battery system having an electric rechargeable battery pack of this type, which have, in particular, improved properties in each case.This object is achieved by the subject matters of the independent claims. Preferred embodiments are the subject of the dependent claims.An electric battery pack (battery pack) according to the invention is provided for an electric battery system. In particular, the electric battery pack is designed for use in the electric battery system. The electric battery pack has a substantially cylindrical electric battery cell. The substantially cylindrically formed electric battery cell is axially extended along a cell height direction. The battery cell is expediently designed for storing electrical energy. The battery cell has two electrical cell contact sections. The two cell contact sections are electrically polarized in opposite directions in a state of the battery cell that is charged with electrical energy. In the state of the battery cell charged with electrical energy, an electrical voltage can therefore be present at the two cell contact sections. The electrical battery pack has at least one electrically conductive connecting device. The connecting device is designed to conduct electric current to one of the two cell contact sections and-alternatively or additionally-away from the one of the two cell contact sections. In particular, one of the conducted current depends on whether the battery cell is being charged or discharged. In this case, the connecting device has an electrically conductive contacting section. The electrically conductive contacting section is configured for electrically contacting, in particular only, the one of the two cell contact sections, wherein the contacting section is electrically and directly mechanically connected to the one of the two cell contact sections. In addition, the connecting device has an electrically conductive connecting section. The electrically conductive connecting section is designed to conduct electric current to the contacting section and-alternatively or additionally-away from the contacting section, wherein the contacting section electrically and indirectly mechanically connects the connecting section to the one of the two cell contact sections. In particular, the connecting section is thus indirectly mechanically connected to the one of the two cell contact sections via the contacting section. The contacting portion has a contacting portion thickness. The connecting portion has a connecting portion thickness. In particular, the connecting section has the connecting section thickness away from the contacting section and-alternatively or additionally-at the contacting section. The contacting portion thickness is smaller than the connecting portion thickness.The contacting section formed thinner than the connecting section can advantageously be connected first to the one of the two cell contact sections, in particular a comparatively thin one, before the connecting section is electrically connected to the one of the two cell contact sections by means of the contacting section. In this way, on the one hand, a sufficient cross section for transmitting the electric current can be provided by means of the connecting section, wherein a challenging mechanical connection of the comparatively thick connecting section to the comparatively thin cell contact section can be accomplished with the aid of the comparatively thin contacting section."Substantially cylindrical" can take account in the present context of the presence of a chamfer and-alternatively or additionally-of a rounding at an, in particular circumferential and / or edge-like, transition between an end face of the substantially cylindrical battery cell and a lateral surface of the battery cell. Alternatively or additionally, "substantially cylindrical" can take account of the presence of unevenness and / or profiling of at least one of the end faces of the battery cell. "Substantially cylindrical" can take account of a spherical shape, in particular of the lateral surface"Substantially cylindrical" can refer in the present context, in particular alternatively or additionally, to the shape of a general cylinder. It is therefore conceivable for the substantially cylindrical rechargeable battery cell to have, for example, a prismatic, in particular cuboidal, shape. The substantially cylindrical rechargeable battery cell preferably has a substantially circular cylindrical shape. The substantially circular cylindrical battery cell can be referred to as a "circular battery cell" as synonym. In particular, the substantially cylindrical battery cell is not a pouch cell.Any "thicknesses" can be measured in the present context along an extreme, i.e. minimum or maximum, extension of the section having the thickness, in particular configured in a planar manner. In particular, the contacting section thickness is measured at a minimum extension of the contacting section. In particular, the connecting portion thickness is measured at a maximum extent of the connecting portion. Alternatively or additionally, any thicknesses may be related to average thicknesses. In particular, a respective thickness along the cell height direction can be measured, in particular if the section having the thickness extends substantially perpendicularly to the cell height direction in a planar manner and-alternatively or additionally-in an elongate manner.The term "configured" or "configured" may be used interchangeably with the term "formed.".The term "comprises" or "has" may be used interchangeably with the term "comprising.".The phrase "as well as-alternatively or additionally-" may be interchangeably replaceable by "and / or.".Expediently, the connecting section is electrically connected exclusively indirectly by means of the contacting section to the one of the two cell contact sections.Expediently, the contacting section is present substantially only in a region of the connecting device in which region the connecting device makes electrical, in particular direct contact with the one of the two cell contact sections.Expediently, the contacting section is tapered in thickness relative to the connecting section and-alternatively or additionally-thinned.The battery cell, which is substantially cylindrical, expediently has an axial cell height and a cell diameter measured perpendicularly to the cell height. The cell diameter may be 10 mm to 30 mm. Alternatively or additionally, the cell height can be 40 mm to 78 mm.In one embodiment of the invention, the two cell contact sections of the rechargeable battery cell are arranged opposite one another along the cell height direction and-alternatively or additionally-in particular at the end face. Alternatively or additionally, the two cell contact sections of the battery cell are arranged offset relative to one another perpendicularly to the cell height direction, in particular radially. A respective cell contact section can be formed by a disk-shaped and / or cap-shaped contact element of the battery cell.In a further embodiment of the invention, in particular at least one of the two cell contact sections has a cell contact section thickness which is 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm. Alternatively or additionally, the contacting section thickness is 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm. Alternatively or additionally, the connecting portion has a connecting portion thickness which is 0.4 mm to 1.0 mm, in particular 0.5 mm to 0.7 mm.Expediently, the connection section thickness can correspond to 1.5 times to 5 times the cell contact section thickness and-alternatively or additionally-to the contacting section thickness.In a further embodiment of the invention, the one of the two cell contact sections is connected to the contacting section in a materially integral manner and-alternatively or additionally-in a positively locking manner and-alternatively or additionally-in a frictionally locking manner.Expediently, one of the two cell contact sections is welded to the contacting section, in particular free of welding filler metal. The one of the two cell contact sections can be welded to the contacting section by means of laser welding or by means of resistance welding, in particular free of welding filler metal. Alternatively or additionally, the one of the two cell contact sections can be electrically connected to the contact section, in each case alternatively or additionally, by means of Velcro welding, by means of screws, by means of clinching, by means of rivets, by means of soldering, by means of adhesive bonding and by means of press fit, in particular by means of insulation displacement contacts provided on the one of the two cell contact sections and - alternatively or additionally - insulation displacement contacts provided on the contact section.In a further embodiment of the invention, the one of the two cell contact sections comprises a nickel-plated steel sheet material. Alternatively or additionally, the contacting section has a nickel-plated steel sheet material, in particular the same, the same or different, and also-alternatively or additionally-a copper sheet material. Alternatively or additionally, the connecting section comprises a copper sheet material.The steel sheet material expediently corresponds to the standard designation "CC01".Expediently, the copper sheet material can comprise or be pure copper (Cu). The copper sheet material may comprise a copper alloy with at least 98% by mass of copper (Cu) or consist of such a copper alloy.In a further embodiment of the invention, the contacting section is arranged directly in a sandwich-like manner, in particular protruding or without protruding, between the one of the two cell contact sections and the connecting section. Alternatively or additionally, the connecting section is offset, in particular protruding, transversely to the cell height direction with respect to the one of the two cell contact sections.In a further embodiment of the invention, the contacting section merges integrally into the connecting section and-alternatively or additionally-integrally into the one of the two cell contact sections. Alternatively or additionally, the connecting section is folded over onto the contacting section and-alternatively or additionally-bent. The connecting section can thus be at least partially sheathed and / or surrounded by the contacting section. Alternatively or additionally, the connecting section can be at least partially sheathed and / or surrounded by the cell contact section. It is also conceivable for the contacting section to be bent over onto the connecting section and / or for the connecting section to be folded over onto itself.In a further embodiment of the invention, the contacting section is exhibited by a component of the battery pack, which component is formed differently, in particular separately, from the connecting section and-alternatively or additionally-differently, in particular separately, from the one of the two cell contact sections. It is understood that this embodiment of the invention can be alternative to the embodiment of the invention mentioned in the preceding description paragraph.In a further embodiment of the invention, the component has a turn-over section which is different from the contacting section and which merges in particular integrally into the contacting section. In this case, the transfer section is transferred together with the connecting section in such a way that the connecting section is arranged between the transfer section and the contacting section, in particular wherein the connecting section is connected to the transfer section and to the contacting section in each case directly and-alternatively or additionally-in a materially bonded manner.In a further embodiment of the invention, the one of the two cell contact sections has a connection zone, in particular a circular ring-shaped connection zone. In this case, the contacting section is connected to the one of the two cell contact sections directly and-alternatively or additionally-in a materially bonded manner exclusively within the connecting zone. In particular, the circular ring-shaped connection zone surrounds a central, in particular circular, region in which there is no, in particular materially bonded, connection of the contacting section to the one of the two cell contact sections.Expediently, the cohesive connection can be produced along a connecting path, in particular along a welding path. The connecting path can extend at least in regions in a rounded manner, in particular in a circular or spiral manner, and / or in an angular manner, in particular in a polygonal manner. Alternatively or additionally, the connecting track can run at least in regions in a straight line. It is understood that alternatively or additionally to the connecting path, at least one connecting point, in particular at least one welding point, can also be provided.In a further refinement of the invention, the battery cell has an electrical battery cell impedance, wherein a value of the battery cell impedance when an electrical alternating current is applied to the two cell contact sections at an alternating current frequency of 1 kHz is less than 10 mΩ (milliohm) at an electrical state of charge (SOC)) of the battery cell of 50% and at a temperature of the battery cell of 20° C. to 25° C. In particular, for the value of the battery cell impedance, only a real part, in particular and not the imaginary part, of the battery cell impedance is taken into account. In particular, the value of the battery cell electrical impedance when the alternating current having the alternating current frequency of 1 kHz is applied is less than 5 mΩ, more particularly less than or equal to 3 mΩ, at an electrical state of charge of 50% and at a temperature of 20° C. to 25° C.In particular, the value of the battery cell electrical impedance of the battery cell when an alternating current having an alternating current frequency of 1 kHz is applied is greater than 0.1 mΩ, in particular greater than 0.5 mΩ, in particular greater than 1 mΩ, in particular greater than 2 mΩ, in particular greater than 2 mΩ, in the case of an electrical state of charge of the battery cell of 50% and at a temperature of the battery cell of 20° C. to 25° C.The state of charge of 50% can expediently be determined as follows: the battery cell can be charged to a predetermined nominal electrical voltage, in particular defined by the manufacturer, wherein the nominal electrical voltage corresponds to the state of charge of 50%. Alternatively or additionally, the battery cell can first be completely electrically discharged or charged, in order to then charge or discharge exactly 50% of the capacity of the battery cell, so that the state of charge of 50% is reached and / or set. It is understood that other and / or combined determination methods may be expedient.The battery cell impedance can expediently be determined as follows: An electrical alternating current with a fixed alternating current frequency of 1 kHz can be impressed on the battery cell, wherein the alternating voltage response of the battery cell resulting from the impressed is measured. "impressed" can be understood here as synonymous with "applied". The battery cell impedance, in particular its value, is obtained as an alternating current resistance (z=u / i) from the ratio of the measured alternating voltage u to the alternating current i.The battery cell is expediently a multitab cell having at least one multitab electrode and, alternatively or additionally, a tabless cell having at least one tabless electrode.Expediently, the tabless cell, in particular designed as a round tabless cell, can be designed according to US 2020 / 0144676 A1. The tab cell can be referred to as synonymous "endless tab cell" with at least one endless tab electrode and-alternatively or additionally-as "early tab cell" with at least one early tab electrode and-alternatively or additionally-as "early free cell" with at least one early free electrode and-alternatively or additionally-as "continuous tab cell" with at least one continuous tab electrode and-alternatively or additionally-as "full tab cell" with at least one full tab electrode.Expediently, battery cells can generally have two wound electrodes which are separated from one another, in particular by means of a separator of the respective battery cell, in particular in a sandwich-like manner. In this case, in the case of a rechargeable battery cell, which is in particular not designed as a tabless cell and / or not as a multitab cell, at least one of the electrodes can have, at one of its axial ends, in particular integral terminal sections (tabs) which are arranged spaced apart from one another for electrically connecting this electrode to one of the two cell contact sections of the relevant rechargeable battery cell. The connection sections, which are spaced apart from one another, can form narrow locations for an electric current flowing between the relevant electrode and the relevant cell contact section, which can cause a relatively high battery cell impedance of such battery cells.Expediently, the tabless cell, in particular in contrast to a battery cell not designed as a tabless cell, can have at least one tabless electrode, in particular a wound tab, wherein the tabless electrode has at one of its axial ends only a single, in particular integral, and-alternatively or additionally-extended over an entire extent of the tabless electrode around a winding axis of the tabless electrode, in particular in a spiral manner, connection section for electrically connecting this tabless electrode to the relevant one of the two cell contact sections. The tabless electrode therefore does not have in particular a plurality of connection sections.Expediently, in particular in contrast to the tabless electrode of the tabless cell, a multitab electrode of a multitab cell can have a plurality of connection sections, in particular arranged directly one after the other, which are in particular each bent over radially in such a way that two adjacent ones of the connection sections touch one another and-alternatively or additionally-overlap one another.It is understood that mixed forms of battery cells are expediently conceivable, in which, for example, the two electrodes are associated with different electrode types. It may even be conceivable under certain circumstances for a single electrode of the electrodes to be associated with different electrode types, for example if their axial ends are of different design.In a further embodiment of the invention, the electric battery pack has a number of battery cells, in particular of similar design. In this case, the connecting device has a number of electrically conductive contact-making sections, wherein the contact-making sections are each directly electrically connected to one of the two cell contact sections of one of the battery cells. The contact sections are in this case directly electrically connected to the, in particular the same, connection section, so that the connection section is indirectly electrically connected to the one of the two cell contact sections of the battery cells by means of the contact sections, in particular in a current-collecting manner, and-alternatively or additionally-in a current-distributing manner. The number of battery cells and-alternatively or additionally-the number of contact-making sections of the connecting device can be 1. The number of battery cells and-alternatively or additionally-the number of contact-making sections of the connecting device can be a plurality. The number of battery cells can correspond to the number of contact-making sections of the connecting device. The number is preferably 1 to 500, in particular 3 to 200. If the number is greater than 1, the connecting device can serve for electrically interconnecting the battery cells.In a further embodiment of the invention, the battery pack has another electrically conductive connecting device, in particular of identical or different design. The battery pack can therefore have at least two electrically conductive connecting devices. The other electrically conductive connecting device can be designed to conduct electric current to other of the cell contact sections of the battery cells and-alternatively or additionally-away from the other of the cell contact sections of the battery cell. One of the connecting devices can be exhibited by an electrical minus path of the battery pack and the other of the connecting devices can be exhibited by an electrical plus path of the battery pack.Expediently, at least one connecting device can define an electrical connecting path of the battery pack, wherein the electrical connecting path connects at least two battery cells of the battery pack to one another. The connection path can expediently electrically connect at least two packets of battery cells to one another, in particular wherein the packets are electrically connected in parallel or in series by means of the connection path. The battery cells associated with a packet can be connected electrically in series or in parallel to one another within the packet.A method according to the invention serves for, in particular at least partially, producing an electrical rechargeable battery pack according to the invention as described above. Advantages of the electrical rechargeable battery pack according to the invention can thus be utilized by means of the method according to the invention. The method has a step a), according to which a substantially cylindrical battery cell is provided, wherein the battery cell is axially extended along a cell height direction and has two cell contact sections. The method also has a step b), according to which an electrically conductive contacting section is provided for the electrically conductive connecting device and an electrically conductive connecting section is provided for the electrically conductive connecting device. Furthermore, the method comprises a step c), according to which the contacting section is electrically connected to one of the two cell contact sections. In particular, the electrical connection according to step c) takes place through the contacting section. In particular, as a result of the electrical connection according to step c), the one of the two cell contact sections can be reinforced, in particular in terms of thickness, by means of the contacting section. The reinforcement can be advantageous in particular if the electrical connection according to step c) is accompanied by a heat input. In addition, the method has a step d) according to which the connection section is electrically connected to the contacting section, so that the contacting section electrically and indirectly mechanically connects the connection section to the one of the two cell contact sections.It is expediently conceivable for step d) to be carried out directly accompanying step b), in particular if the connecting section and the contacting section are formed in one piece.It is expediently conceivable that steps a) and b) can be carried out simultaneously if the contacting section is already attached to the battery cell, in particular in such a way that the contacting section protrudes outwards from an interior of the battery cell, in particular through a cell housing of the battery cell.Expediently, if the contacting section is comprised of a component for the battery pack, which also has a wrapping section, the connecting section can be positioned at the wrapping section first. Subsequently, the connecting portion can be connected directly and-alternatively or additionally-in a materially integral manner to the transfer portion. If the connecting section is directly and alternatively or additionally materially connected to the wrapping section, the wrapping section together with the connecting section fastened thereto can be wrapped over onto the contacting section and can be bent over alternatively or additionally, so that the connecting section is arranged between the wrapping section and the contacting section, in particular along the cell height direction. Subsequently, in particular through the wrapping section, the connecting section can be directly and-alternatively or additionally-materially connected to the contacting section. In this case, the contacting section can already have been electrically connected to the one of the two cell contact sections in advance or can subsequently be electrically connected to the one of the two cell contact sections.In one embodiment of the invention, the electrical connection according to step c) of the method and-alternatively or additionally-the electrical connection according to step d) of the method are carried out in a materially integral manner, in particular by welding, in particular without welding additives, in particular by laser welding or by resistance welding. Alternatively or additionally, the electrical connection according to step c) and - alternatively or additionally - according to step d) can be effected by means of hook-and-loop welding and - alternatively or additionally - by means of screws and - alternatively or additionally - by means of clinching and - alternatively or additionally - by means of rivets and - alternatively or additionally - by means of soldering and - alternatively or additionally - by means of adhesive bonding and - alternatively or additionally - by means of press fit, in particular by means of insulation displacement contacts provided on the one of the two cell contact sections and - alternatively or additionally - on the contacting section.In a further embodiment of the invention, steps a) and b) of the method are carried out temporally before steps c) and d), step c) being carried out temporally before or simultaneously with step d). Alternatively or additionally, steps a) to d), in particular for each connecting device and-alternatively or additionally-are carried out multiple times for a number of battery cells for the battery pack and a number of contacting devices for electrically contacting the one of the two cell contact sections of one of the battery cells in each case.Advantageously, steps a) and b) can be carried out a plurality of times before step c) is carried out a plurality of times. In particular, step c) may be performed either multiple times before step d) is performed multiple times, or multiple times simultaneously along with step d). Alternatively or additionally, however, it is also conceivable for steps a) to d) to be carried out repeatedly one after the other in an iteration loop-like manner. In particular, steps a) to d) can be carried out first for one connection device and then for the other connection device or simultaneously for both connection devices.An electric battery system according to the invention has an electric battery pack according to the invention as described above. In particular, the electric rechargeable battery pack of the electric rechargeable battery system is produced, in particular at least partially, by means of a method according to the invention described above. The electric battery system also has an electric battery device which has a receiving device for interchangeably receiving and for the associated electrical connection of the battery pack to the battery device.In one embodiment of the invention, the electrical rechargeable battery device is an electrical processing device that can be supplied with electrical energy by means of the rechargeable battery pack accommodated. Alternatively or additionally, the electric battery device is an electric charger for electrically charging the accommodated battery pack.Expediently, the battery device designed as a processing device is ground-guided and / or hand-guided, in particular hand-carried and / or back-carried and / or a garden, forest, ground and / or construction processing device. The processing device can be configured to be manually guidable, that is to say in particular a processing direction of the processing device is adjustable relative to a workpiece currently processed by means of the processing device by a user hand guiding the processing device. In particular, the processing device can be a saw, in particular a chainsaw, or a high-end switch, or a hedge trimmer, or a hedge trimmer, or a wood cutter, or an branch trimmer, a grinding cutter or a blower, or a leaf blower, or a suction device, or a leaf sucker, or a cleaning device, or a high-pressure cleaner, or a sweeping device, or a sweeping roller, or a sweeping brush, or a lawnmower, or a grass trimmer, or a brush cutter, or a ticuter. Additionally or alternatively, the processing device can have a processing tool and / or a drive motor, in particular an electric drive motor, in particular for driving the processing tool. The drive motor can be supplied with electrical energy from the battery pack, in particular in order to provide drive power for the machining tool.The rechargeable battery device designed as a charger expediently has a grid connection for electrical connection to an electrical energy source, for example to an electrical supply grid. The charging device can serve to charge the accommodated battery pack with electrical energy from the energy source. The charger may comprise an electronic charge controller.It is understood that the battery device designed as a processing device can have a mains connection for electrically connecting to an electrical energy source, for example to an electrical supply mains, in order to charge the battery pack with electrical energy from the electrical energy source. In this respect, the rechargeable battery device can be designed in dual function both as a processing device and as a charging device.BRIEF DESCRIPTION OF THE DRAWINGSFurther advantages and features of the invention are evident from the claims and from the following description of preferred exemplary embodiments of the invention, which are illustrated on the basis of the drawings. The same reference numerals refer to the same or similar or functionally the same components.It is understood that the features mentioned above and those still to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention. FIG. 1 shows a schematic side view of an embodiment of an electric battery pack according to the invention, FIG. 2 shows a detail of the side view according to FIG. 1, FIG. 3 shows a schematic side view of a further embodiment of the electric battery pack according to the invention, FIG. 4 shows a schematic side view of a further embodiment of the battery pack according to the invention, FIG. 5 shows a schematic plan view of a further embodiment of the electrical battery pack according to the invention, FIG. 6 shows a schematic flow chart for carrying out an embodiment of a method according to the invention for producing an electrical rechargeable battery pack according to the invention, in particular according to FIGS. 1 to 5, FIG. 7 shows a schematic side view of a further embodiment of an electric battery pack according to the invention, FIG. 8 shows a schematic perspective illustration of an electrical rechargeable battery device designed as an electrical charger for an embodiment of an electrical rechargeable battery system according to the invention, and FIG. 9 shows a schematic side view of an embodiment of the electric rechargeable battery system with an electric rechargeable battery device designed as an electric processing device and with the rechargeable battery pack according to FIG. 7.DETAILED DESCRIPTION OF THE EMBODIMENTSAn electric battery pack 1 is provided for a battery system 100. The electric battery pack 1 is therefore designed, for example, for use in the battery system 100.An electric battery system 100 has the electric battery pack 1. In addition, the battery system 100 has an electric battery device 50. The electrical rechargeable battery device 50 has a receiving device 51 which is designed for interchangeably receiving and for the associated, in particular releasable, electrical connection of the rechargeable battery pack 1 to the rechargeable battery device 50. The electric battery device 50 is designed, for example, as an electric processing device 52 (shown in FIG. 9 ) that can be supplied with electrical energy by means of the picked-up battery pack 1. Alternatively or additionally, the electric battery device 50 is designed as an electric charger 53 (shown in FIG. 8 ) for electrically charging the accommodated battery pack 1.The electric machining apparatus 52 shown in FIG. 9 is an electric power saw. The processing device 52 has, for example, a processing tool-in the present case in the form of a saw chain. Alternatively or additionally, the machining device 52 can have a drive motor, in particular an electric drive motor, which can serve to drive the machining tool. For example, the drive motor can be supplied with electrical energy from the picked-up battery pack 1 in order to provide drive power for the machining tool.The rechargeable battery device 50 designed as a charger 53 has, for example, a grid connection for electrically connecting to an electrical energy source, for example in the form of an electrical supply grid. The charging device 53 serves, for example, to charge the accommodated battery pack 1 with electrical energy from the energy source. The charger 53 may include an electronic charge controller.It is understood that the battery device 50 designed as a processing device 52 can have a mains connection-not shown here-for electrically connecting to an electrical energy source, for example in the form of an electrical supply network, in order to charge the accommodated battery pack 1 with electrical energy from the electrical energy source. In this respect, the battery device 50 can be designed in dual function both as a processing device 52 and as a charging device 53.The battery pack 1 has at least one substantially cylindrical electric battery cell 2. The battery cell 2 extends axially along a cell height direction Z. The battery cell 2 has two electrical cell contact sections 3, 3A, 3B. The two cell contact sections 3, 3A, 3B are electrically polarized in opposite directions when the battery cell 2 is charged with electrical energy. In the present case, the battery cell 2 is designed as a substantially circular cylindrical battery cell 2, that is to say as a round battery cell.In the present case, the battery cell 2 has a cell height measured along the cell height direction Z. In addition, the battery cell 2 has, for example, a cell diameter measured perpendicularly to the cell height, i.e. radially. The cell diameter may be 10 mm to 30 mm. Alternatively or additionally, the cell height can be 40 mm to 78 mm.The battery pack 1 also has at least one electrically conductive connecting device 30, 30A, 30B. The connecting device 30, 30A, 30B serves for carrying electric current to one of the two cell contact sections 3, 3A, 3B and-alternatively or additionally-away from the one of the two cell contact sections 3, 3A, 3B. With reference to FIGS. 1 to 4, the connecting device 30, 30A can serve for conducting electric current to the cell contact section 3, 3A, whereas the other connecting device 30, 30B serves for conducting electric current away from the other of the two cell contact sections 3, 3B, in particular in the event of the battery pack 1 being discharged. When the battery pack 1 is charged, the electric current can be conducted in the reverse direction.The electrically conductive connecting device 30, 30A, 30B has an electrically conductive contacting section 4, 4A, 4B. The contacting section 4, 4A, 4B serves for electrically contacting the one of the two cell contact sections 3, 3A, 3B. In this case, the contacting section 4, 4A, 4B is electrically and directly mechanically connected to the one of the two cell contact sections 3, 3A, 3B. The contacting section 4, 4A, 4B can thus contact the respective cell contact section 3, 3A, 3B.The connecting device 30, 30A, 30B has an electrically conductive connecting section 5, 5A, 5B. The electrically conductive connecting section 5, 5A, 5B serves for carrying electric current to the contacting section 4, 4A, 4B and-alternatively or additionally-away from the contacting section 4, 4A, 4B. With reference to FIGS. 1 to 4, the connecting portion 5, 5A may serve for conducting electric current toward the contacting portion 4, 4A, whereas the other connecting portion 5, 5B serves for conducting electric current away from the other contacting portion 4, 4B, in particular when the battery pack 1 is discharged. The contacting section 4, 4A, 4B electrically and indirectly mechanically connects the connecting section 5, 5A, 5B to the one of the two cell contact sections 3, 3A, 3B. In particular, the respective connecting section 5, 5A, 5B is thus electrically and indirectly mechanically connected via the respective contacting section 4, 4A, 4B.The contacting portion 4, 4A, 4B has a contacting portion thickness 7. The connecting portion 5, 5A, 5B has a connecting portion thickness 8. For example, the connecting section 5, 5A, 5B has the connecting section thickness 8, in particular at least or exclusively, away from the contacting section 4, 4A, 4B. Alternatively or additionally, the connecting section 5, 5A, 5B can have the connecting section thickness 8 at the contacting section 4, 4A, 4B, i.e. in particular in a region in which the connecting section 5, 5A, 5B contacts the contacting section 4, 4A, 4B. The bonding portion thickness 7 is smaller than the bonding portion thickness 8.For example, the connecting section 5, 5A, 5B is electrically connected exclusively indirectly by means of the contacting section 4, 4A, 4B to the one of the two cell contact sections 3, 3A, 3B. The contacting section 4, 4A, 4B can be present substantially only in a region of the connecting device 30, 30A, 30B, in which region the connecting device 30, 30A, 30B makes electrical contact, in particular directly contacting, with the one of the two cell contact sections 3, 3A, 3B.The contacting section 4, 4A, 4B can be tapered and / or thinned in thickness relative to the connecting section 5, 5A, 5B.The two cell contact sections 3, 3A, 3B of the battery cell 2 can be arranged opposite one another along the cell height direction Z and-alternatively or additionally-on the end face. In the present case, the two cell contact sections 3, 3A, 3B are arranged opposite one another along the cell height direction Z and in each case on the end face. Alternatively or additionally, the two cell contact sections 3, 3A, 3B of the battery cell 2 can be arranged offset from one another perpendicularly to the cell height direction Z, in particular radially.At least one of the two, in the present case each of the cell contact sections 3, 3A, 3B has, for example, a cell contact section thickness 6. The cell contact portion thickness 6 is, for example, 0.05 mm to 0.4 mm, in the present case 0.15 mm to 0.3 mm. Alternatively or additionally, the contacting section thickness 7 is 0.05 mm to 0.4 mm, in the present case 0.15 mm to 0.3 mm. The cell contact portion thickness 6 may be the same as the contacting portion thickness 7.The connecting portion 5, 5A, 5B may have a connecting portion thickness 8. The joint portion thickness 8 may be 0.4 mm to 1.0 mm. In the present case, the connecting portion thickness 8 is 0.5 mm to 0.7 mm.For example, the connection portion thickness 8 corresponds to 1.5 times to 5 times the cell contact portion thickness 6.The connecting portion 5, 5A, 5B can be formed in multiple layers, in particular wherein the connecting portion thickness 8 can comprise multiple, in particular all, layers of the connecting portion 5, 5A, 5B.The one of the two cell contact sections 3, 3A, 3B is connected to the contacting section 4, 4A, 4B, for example, in a materially bonded manner. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B in a form-fitting and-alternatively or additionally-in a force-fitting manner. In the present case, the one of the two cell contact sections 3, 3A, 3B is welded to the contacting section 4, 4A, 4B, for example free of welding filler metal. The one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of laser welding and / or by means of resistance welding.Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected by means of Velcro-type welding. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of screws. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of clinching. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of rivets. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of soldering. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of adhesive bonding. Alternatively or additionally, the one of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by means of a press fit. For connecting the one of the two cell contact sections 3, 3A, 3B to the contacting section 4, 4A, 4B, at least one cutting contact can be provided on the one of the two cell contact sections 3, 3A, 3B and / or on the contacting section 4, 4A, 4B.In the drawings of FIGS. 1, 3 and 4, empty triangles can be seen which are intended to indicate the respective connection of the contacting section 4, 4A, 4B to the cell contact section 3, 3A, 3B and / or for the respective connection of the connecting section 5, 5A, 5B to the contacting section 4, 4A, 4B. The triangles may illustrate a laser beam for laser welding focused on a respective welding region for the joint.The one of the two cell contact portions 3, 3A, 3B includes, for example, a nickel-plated steel sheet material. The contacting section 4, 4A, 4B can comprise a nickel-plated steel sheet material and, alternatively or additionally, a copper sheet material. Alternatively or additionally, the connecting section 5, 5A, 5B comprises a copper sheet material.The copper material may include or be pure copper (Cu). The copper sheet material may comprise a copper alloy with at least 98% by mass of copper (Cu) or consist of such a copper alloy. The steel sheet material may be under the standard designation "CC01".The two cell contact sections 3, 3A, 3B can be embodied in the same or in different ways.For example, the contacting section 4, 4A, 4B is arranged in a sandwich-like manner directly, in particular protruding or without protruding, between the one of the two cell contact sections 3, 3A, 3B and the connecting section 5, 5A, 5B. Alternatively or additionally, the connecting section 5, 5A, 5B is offset, in particular protruding, transversely to the cell height direction Z, with respect to which one of the two cell contact sections 3, 3A, 3B is arranged.For example, the contacting section 4, 4A, 4B integrally merges into the connecting section 5, 5A, 5B, cf. FIG. 1 at the bottom. Alternatively or additionally, the contacting section 4, 4A, 4B can merge integrally into the one of the cell contact sections 3, 3A, 3B.The connecting section 5, 5A, 5B can be folded over and / or bent over the contacting section 4, 4A, 4B, as indicated in particular by dashed lines in FIGS. 3 and 4. This component 20 can be formed differently from the connecting section 5, 5A, 5B and-alternatively or additionally-from the one of the two cell contact sections 3, 3A, 3B, in particular separately. The component 20 has, for example, a transfer section 9 which is different from the contacting section 4, 4A, 4B and merges in particular integrally into the contacting section 4, 4A, 4B. In this case, the transfer section 9 can be transferred together with the connecting section 5, 5A, 5B in such a way that the connecting section 5, 5A, 5B is arranged between the transfer section 9 and the contacting section 4, 4A, 4B. In this case, the connecting section 5, 5A, 5B can be connected to the folding section 9 and to the contacting section 4, 4A, 4B in each case directly and / or in a materially integral manner.As can be seen in particular with reference to FIG. 5, the one of the two cell contact sections 3, 3A, 3B can have a connection zone 11, for example a circular ring. In this case, the contacting section 4, 4A, 4B is connected directly and / or firmly bonded to the one of the two cell contact sections 3, 3A, 3B exclusively within the connecting zone 11. The cohesive connection can be produced along a connecting path, in particular along a welding path. The connecting path can extend at least in regions in a rounded manner, in particular in a circular or spiral manner. Alternatively or additionally, the connecting web can extend at least in regions angularly, in particular polygonally. Alternatively or additionally, it is conceivable for the connecting path to extend at least in regions in a straight line. It is understood that alternatively or additionally to the connecting track, a connecting point can also be provided, in particular a plurality of connecting points.For example, the battery cell 2 has an electrical battery cell impedance. Here, a value of the battery cell impedance is less than 10 mΩ when an alternating electric current having an alternating current frequency of 1 kHz is applied to the two cell contact portions 3, 3A, 3B of the battery cell 2 at an electric state of charge of the battery cell 2 of 50% and at a temperature of the battery cell 2 of 20° C. to 25° C.The battery cell 2 is designed, for example, as a multitab cell having at least one multitab electrode and-alternatively or additionally-as in the present case-as a tabless cell 12 having at least one tabless electrode 13. The tabless electrode 13 is wound up, for example. The tab electrode 13 can have at at least one of its axial ends only a single, in particular integral, connection section ("tab") for electrically connecting the tab electrode 13 to the associated one of the two cell contact sections 3, 3A, 3B, and / or extending over an entire extent of the tab electrode 13 about a winding axis of the tab electrode 13. The tabless electrode 13 therefore does not have a plurality of connection sections in the present case. In contrast to the tabless cell 12, a multitab electrode of a multitab cell can have a multiplicity of connection sections, which are arranged in particular directly one after the other, and which are bent over in particular radially in such a way that two adjacent ones of the connection sections touch one another and / or overlap one another. It is understood that mixed forms of battery cells 2 are conceivable.The value of the battery cell electrical impedance may be greater than 0.1 mΩ, in particular greater than 0.5 mΩ, in particular greater than 1 mΩ, in particular greater than 2 mΩ. Alternatively or additionally, the value of the electric battery cell impedance can be less than 5 mΩ, very particularly less than or equal to 3 mΩ.The electric battery pack 1 has, for example, a number of battery cells 2, in particular of similar design. In this case, the connecting device 30, 30A, 30B can have a number of electrically conductive contact-making sections 4, 4A, 4B, which are each directly electrically connected to one of the two cell contact sections 3, 3A, 3B of one of the battery cells 2. The contact-making sections 4, 4A, 4B can be directly electrically connected to the, in particular the same, connection section 5, 5A, 5B, respectively, so that the connection section 5, 5A, 5B is indirectly electrically connected to the one of the two cell contact sections 3, 3A, 3B of the battery cells 2 by means of the contact-making sections 4, 4A, 4B.The number of battery cells 2 and / or the number of contact-making sections 4, 4A, 4B of the connecting device 30, 30A, 30B can be 1. The number of battery cells 2 and / or the number of contact-making sections 4, 4A, 4B of the connecting device 30, 30A, 30B can be a plurality. The number of battery cells 2 may correspond to the number of contact sections 4, 4A, 4B of connecting device 30, 30A, 30B. For example, the number is 1 to 500, in particular 3 to 200. In particular, all of the battery cells 2 are of the same type, that is to say in particular all of the battery cells 2 can be of the same type.The battery pack 1 can have two connecting devices 30, 30A, 30B, i.e. as in the present case one connecting device 30, 30A and another connecting device 30, 30B. The connecting device 30, 30A can be designed to conduct electric current to the one of the two cell contact sections 3, 3A of the battery cells 2. In contrast, the other connecting device 30, 30B can serve for conducting electric current away from other of the two cell contact sections 3, 3B of the battery cells 2.According to FIGS. 1 to 4, the connecting device 30, 30A is, for example, embodied differently from the other connecting device 30, 30B. It goes without saying that the connecting device 30, 30A can, however, also be designed in the same way as the other connecting device 30, 30B. It is understood that the connecting device 30, 30A, 30B shown by way of example in FIGS. 1 to 4 can be combined expediently in other embodiments.FIG. 7 shows an outer housing of the battery pack 1, by means of which inner life of the battery pack 1 can be housed. The inner life of the battery pack 1 according to FIG. 7 is realized, for example, as shown by way of example in FIGS. 1 to 4. In other words: FIGS. 1 to 4 show in particular only an inner life of the battery pack 1, in particular without a housing of the battery pack 1.The electric battery pack 1 can be produced, in particular at least partially, by means of a method V. The method V comprises a step a) according to which at least one substantially cylindrical rechargeable battery cell 2 is provided, wherein the rechargeable battery cell 2 is axially extended along the cell height direction Z and comprises two cell contact sections 3, 3A, 3B. The method V also has a step b) according to which an electrically conductive contacting section 4, 4A, 4B is provided for the electrically conductive connecting device 30, 30A, 30B. Moreover, according to step b), an electrically conductive connection section 5, 5A, 5B is provided for the electrically conductive connection device 30, 30A, 30B. In other words: according to step b), the electrically conductive connecting device 30, 30A, 30B can be provided, in particular in individual parts. The method V also has a step c), according to which the contacting section 4, 4A, 4B is electrically connected to one of the two cell contact sections 3, 3A, 3B. Furthermore, the method V has a step d) according to which the connecting section 5, 5A, 5B is electrically connected to the contacting section 4, 4A, 4B, such that the contacting section 4, 4A, 4B electrically and indirectly mechanically connects the connecting section 5, 5A, 5B to the one of the two cell contact sections 3, 3A, 3B.As is indicated by way of example in FIG. 3 by dashed lines, the connecting section 5, 5B can be positioned on the transfer section 9. Subsequently, the connecting section 5, 5B can be connected directly and / or in a materially integral manner to the transfer section 9. If the connecting section 5, 5B is directly and / or materially connected to the wrapping section 9, the wrapping section 9 together with the connecting section 5, 5B fastened thereto can be wrapped and / or bent over onto the contacting section 4, 4B, so that the connecting section 5, 5B is arranged between the wrapping section 9 and the contacting section 4, 4B, for example along the cell height direction Z. Subsequently, for example through the wrapping section 9, the connecting section 5, 5B can be connected directly and / or in a materially integral manner to the contacting section 4, 4B. In this case, the contacting section 4, 4B can already have been electrically connected to the one of the two cell contact sections 3, 3B in advance or can subsequently be electrically connected to the one of the two cell contact sections 3, 3A.For example, the electrical connection according to step c) and / or according to step d) takes place in a materially integral manner. The cohesive connection according to step c) and / or according to step d) can be effected by welding, for example without welding additives. In the present case, the electrical connection according to step c) and / or according to step d) is effected by laser welding and / or by resistance welding.For example, steps a) and b) of method V are performed prior to steps c) and d). In this case, step c) can be carried out temporally before or simultaneously with step d).Steps a) to d) of process V can be carried out a plurality of times. For example, steps a) to d) per connecting device 30, 30A, 30B can be carried out once or several times. Steps a) to d) can be carried out for a number of battery cells 2 for battery pack 1, in particular for each connecting device 30, 30A, 30B and / or multiple times. In addition, steps a) to d) can be carried out for a number of contact-making devices 4, 4A, 4B for electrically contacting the one of the two cell contact sections 3, 3A, 3B of in each case one of the battery cells 2, in particular for each connection device 30, 30A, 30B, and / or several times.For example, steps a) and b) may be performed a plurality of times before step c) is performed a plurality of times. In particular, step c) may be performed multiple times before step d) is performed multiple times, or multiple times simultaneously along with step d). Alternatively or additionally, however, it is also conceivable for steps a) to d) to be carried out repeatedly one after the other in an iteration loop-like manner. In particular, steps a) to d) can be carried out first for one and then for the other connecting device 30, 30A, 30B or simultaneously for both connecting devices 30, 30A, 30B.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedUS 2020 / 0144676 A1

[0035]

Claims

An electric battery pack (1) for an electric battery system (100), the electric battery pack (1) comprising: - at least one substantially cylindrical electric battery cell (2) which is axially extended along a cell height direction (Z) and which comprises two electric cell contact portions (3, 3A, 3B), wherein the two cell contact portions (3, 3A, 3B) are electrically poled in opposite directions in a state of the battery cell (2) being charged with electrical energy, - at least one electrically conductive connecting device (30, 30A, 30B) for carrying electrical current to one of the two cell contact portions (3, 3A, 3B) and / or away from the one of the two cell contact portions (3, 3A, 3B), wherein the connecting device (30, 30A, 30b): - an electrically conductive contacting section (4, 4A, 4B) for electrically contacting the one of the two cell contact sections (3, 3A, 3B), wherein the contacting section (4, 4A, 4B) is electrically and directly mechanically connected to the one of the two cell contact sections (3, 3A, 3B), and - an electrically conductive connecting section (5, 5A, 5B) for carrying electric current to the contacting section (4, 4A, 4B) and / or away from the contacting section (4, 4A, 4B), wherein the contacting section (4, 4A, 4B) electrically and indirectly mechanically connects the connecting section (5, 5A, 5B) to the one of the two cell contact sections (3, 3A, 3B); wherein the contacting portion (4, 4A, 4B) has a contacting portion thickness (7), - wherein the connecting portion (5, 5A, 5B) has a connecting portion thickness (8), - wherein the contacting portion thickness (7) is smaller than the connecting portion thickness (8).Electrical rechargeable battery pack (1) according to the preceding claim, - wherein the two cell contact sections (3, 3A, 3B) of the rechargeable battery cell (2) are arranged opposite one another and / or on the end side along the cell height direction (Z), and / or - wherein the two cell contact sections (3, 3A, 3B) of the rechargeable battery cell (2) are arranged offset with respect to one another perpendicularly to the cell height direction (Z), in particular radially.Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the one of the two cell contact sections (3, 3A, 3B) has a cell contact section thickness (6) which is 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm, and / or - wherein the contact section thickness (7) is 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm, and / or - wherein the connection section (5, 5A, 5B) has a connection section thickness (8) which is 0.4 mm to 1.0 mm, in particular 0.5 mm to 0.7 mm.Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the one of the two cell contact sections (3, 3A, 3B) is connected to the contacting section (4, 4A, 4B) in a materially bonded and / or positively bonded and / or non-positively bonded manner, - in particular wherein the one of the two cell contact sections (3, 3A, 3B) is welded to the contacting section (4, 4A, 4B), in particular without welding additives, in particular by means of laser welding or by means of resistance welding.Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the one of the two cell contact sections (3, 3A, 3B) has a nickel-plated steel sheet material; and / or - wherein the contacting section (4, 4A, 4B) has a nickel-plated steel sheet material and / or a copper sheet material; and / or - wherein the connecting section (5, 5A, 5B) has a copper sheet material.Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the contacting section (4, 4A, 4B) is arranged in a sandwich-like manner directly, in particular protruding or without protruding, between the one of the two cell contact sections (3, 3A, 3B) and the connecting section (5, 5A, 5B); and / or - wherein the connecting section (5, 5A, 5B) is arranged offset, in particular protruding, transversely to the cell height direction (Z) with respect to the one of the two cell contact sections (3, 3A, 3B).Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the contact-making section (4, 4A, 4B) merges integrally into the connection section (5, 5A, 5B) and / or integrally into the one of the cell contact sections (3, 3A, 3B); and / or - wherein the connection section (5, 5A, 5B) is folded over and / or bent over onto the contact-making section (4, 4A, 4B).Electrical battery pack (1) according to one of Claims 1 to 6, - wherein the contacting section (4, 4A, 4B) is exhibited by a component (20) of the battery pack (1), which component (20) is formed differently from the connecting section (5, 5A, 5B) and / or from the one of the cell contact sections (3, 3A, 3B), in particular separately.Electrical rechargeable battery pack (1) according to the preceding claim, - wherein the component (20) has a transfer section (9) which is different from the contact-making section (4, 4A, 4B) and merges in particular integrally into the contact-making section (4, 4A, 4B), - wherein the transfer section (9) is transferred together with the connecting section (5, 5A, 5B) in such a way that the connecting section (5, 5A, 5B) is arranged between the transfer section (9) and the contact-making section (4, 4A, 4B), in particular wherein the connecting section (5, 5A, 5B) is connected in each case directly and / or integrally to the transfer section (9) and to the contact-making section (4, 4A, 4B).Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the one of the two cell contact sections (3, 3A, 3B) has a connection zone (11), in particular a circular ring-shaped connection zone, - wherein the contact section (4, 4A, 4B) is connected directly and / or firmly bonded to the one of the two cell contact sections (3, 3A, 3B) exclusively within the connection zone (11).Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the rechargeable battery cell (2) has an electrical rechargeable battery cell impedance, wherein a value of the rechargeable battery cell impedance is less than 10 mΩ when an electrical alternating current is applied to the two cell contact sections (3, 3A, 3B) with an alternating current frequency of 1 kHz, in the case of an electrical state of charge of the rechargeable battery cell (2) of 50% and in the case of a temperature of the rechargeable battery cell (2) of 20°C to 25°C; and / or - wherein the rechargeable battery cell (2) is a multitab cell having at least one multitab electrode and / or a tabless cell (12) having at least one tabless electrode (13).Electrical rechargeable battery pack (1) according to one of the preceding claims, - wherein the electrical rechargeable battery pack (1) has a number of rechargeable battery cells (2), in particular of similar design, - wherein the connecting device (30, 30A, 30B) has a number of electrically conductive contact-making sections (4, 4A, 4B), which are each directly electrically connected to one of the two cell contact sections (3, 3A, 3B) of one of the rechargeable battery cells (2), - wherein the contact-making sections (4, 4A, 4B) are each directly electrically connected to the, in particular the same, connection section (5, 5A, 5B), such that the connection section (5, 5A, 5B) is directly electrically connected to the one of the two cell contact sections (3, 3A, 3B) of the rechargeable battery cells (2) by means of the contact-making sections (4, 4A, 4 b), in particular current-collecting and / or current-distributing, is indirectly electrically connected.Electrical battery pack (1) according to the preceding claim, - wherein the battery pack (1) has another electrically conductive connecting device (30, 30A, 30B), in particular of identical or different design, for carrying electrical current to other of the cell contact sections (3, 3A, 3B) of the battery cells (2) and / or away from the other of the cell contact sections (3, 3A, 3B) of the battery cells (2).Method (V) for producing an electric battery pack (1) according to one of the preceding claims, wherein the method (V) comprises the steps of: a) providing a substantially cylindrical battery cell (2) which is axially extended along a cell height direction (Z) and which has two cell contact sections (3, 3A, 3B); b) providing an electrically conductive contacting section (4, 4A, 4B) for the electrically conductive connecting device (30, 30A, 30B) and an electrically conductive connecting section (5, 5A, 5B) for the electrically conductive connecting device (30, 30A, 30B); c) electrically connecting the contacting section (4, 4A, 4B) to one of the two cell contact sections (3, 3A, 3B); and d) electrically connecting the connecting section (5, 5A, 5B) to the contacting section (4, 4A, 4B), so that the contacting section (4, 4A, 4B) electrically and indirectly mechanically connects the connecting section (5, 5A, 5B) to the one of the two cell contact sections (3, 3A, 3B).Method (V) according to the preceding claim, - wherein the electrical connection according to step c) and / or according to step d) is effected in a materially integral manner, in particular by welding, in particular without welding additives, in particular by laser welding or by resistance welding.Method (V) according to one of the two preceding claims, - wherein steps a) and b) of method (V) are carried out temporally before steps c) and d), wherein step c) is carried out temporally before or simultaneously with step d); and / or - wherein steps a) to d), in particular per connecting device (30, 30A, 30B) and / or multiple times, are carried out for: - a number of battery cells (2) for the battery pack (1), - a number of contacting devices (4, 4A, 4B) for electrically contacting the one of the two cell contact sections (3, 3A, 3B) of in each case one of the battery cells (2).An electric battery system (100), which comprises: - an electric battery pack (1) according to one of claims 1 to 13, in particular produced by means of a method (V) according to one of the three preceding claims, - an electric battery device (50), which comprises a receiving device (51) for interchangeably receiving and for the associated electrical connection of the battery pack (1).Electrical battery system (100) according to the preceding claim, - wherein the electrical battery device (50) is an electrical processing device (52) which can be supplied with electrical energy by means of the accommodated battery pack (1) and / or an electrical charger (53) for electrically charging the accommodated battery pack (1).

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