DE102023135807B4 - Electric battery pack, process and electric battery system - Google Patents

Abstract

Electric battery pack (1) for an electric battery system (100), wherein the electric battery pack (1) comprises:
- at least one substantially cylindrical electric battery cell (2) which extends axially along a cell height direction (Z) and which has two electric cell contact sections (3, 3A, 3B), wherein the two cell contact sections (3, 3A, 3B) are electrically polarized in an electrically charged state of the battery cell (2),
- at least one electrically conductive connecting device (30, 30A, 30B) for conducting electric current to one of the two cell contact sections (3, 3A, 3B) and/or away from one of the two cell contact sections (3, 3A, 3B), wherein the connecting device (30, 30A, 30B) comprises:
- an electrically conductive contacting section (4, 4A, 4B) for electrically contacting one of the two cell contact sections (3, 3A, 3B), wherein the contacting section (4, 4A, 4B) is electrically and directly mechanically connected to one of the two cell contact sections (3, 3A, 3B), and
- an electrically conductive connecting section (5, 5A, 5B) for conducting electric current to 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 one of the two cell contact sections (3, 3A, 3B);
- wherein the contact section (4, 4A, 4B) has a contact section thickness (7),
- wherein the connecting section (5, 5A, 5B) has a connecting section thickness (8),
- where the contacting section thickness (7) is smaller than the connecting section thickness (8),
- wherein 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,
- wherein the contact section thickness (7) is 0.05 mm to 0.4 mm,
- wherein the connection section thickness (8) is 0.4 mm to 1.0 mm, and
- wherein the contacting section (4, 4A, 4B) is arranged sandwich-like directly without overhang between one of the two cell contact sections (3, 3A, 3B) and the connecting section (5, 5A, 5B).

Description

SCOPE OF APPLICATION AND STATE OF THE ART

The invention relates to an electric battery pack for an electric battery system. The invention also relates to a method for manufacturing such an electric battery pack. Furthermore, the invention relates to an electric battery system comprising such an electric battery pack.

The US 2022 / 0 311 103 A1 reveals a multi-layered flexible battery connector for connecting batteries in battery packs. Furthermore, the US 2021 / 0 384 592 A1 A battery module capable of maintaining a high connection strength at a junction between dissimilar metals on a busbar. Furthermore, the DE 10 2017 112 860 A1 Cell connectors for battery packs with lithium-ion cells. DE 10 2013 017 168 A1 further discloses a device for electrically connecting several cylindrical cells for storing electrical energy.

TASK AND SOLUTION

It is an object of the present invention to provide an electric battery pack for an electric battery system, a method for manufacturing such an electric battery pack, and an electric battery system with such an electric battery pack, which, in particular, each have improved properties.

This problem is solved by the subject matter of the independent patent claims. Preferred embodiments are the subject matter of the dependent patent claims.

An electrical battery pack according to the invention is intended for use in an electrical battery system. In particular, the electrical battery pack is designed for use in the electrical battery system. The electrical battery pack comprises a substantially cylindrical electrical battery cell. The substantially cylindrical electrical battery cell extends axially along a cell height direction. Advantageously, the battery cell is designed for storing electrical energy. The battery cell has two electrical cell contact sections. The two cell contact sections are electrically polarized in an electrically charged state of the battery cell. Thus, an electrical voltage can be present at both cell contact sections in the electrically charged state of the battery cell. The electrical battery pack has at least one electrically conductive connection device. The connection device is designed to conduct electrical current to one of the two cell contact sections and—alternatively or additionally—away from one of the two cell contact sections. In particular, the conduction of the current depends on whether the battery cell is being charged or discharged. The connection device has an electrically conductive contact section. The electrically conductive contact section is designed for electrical contact, in particular only, with one of the two cell contact sections, wherein the contact section is electrically and directly mechanically connected to that one of the two cell contact sections. The connection also includes an electrically conductive connecting section. The electrically conductive connecting section is designed to conduct electric current to the contact section and—alternatively or additionally—away from the contact section, wherein the contact section electrically and indirectly mechanically connects the connecting section to one of the two cell contact sections. In particular, the connecting section is thus indirectly mechanically connected to one of the two cell contact sections via the contact section. The contact section has a contact section thickness. The connecting section has a connecting section thickness. In particular, the connecting section has the connecting section thickness away from the contact section and—alternatively or additionally—at the contact section. The contact section thickness is less than the connecting section thickness.

The contacting section, which is thinner than the connecting section, can advantageously be first connected to one of the two cell contact sections, which is particularly thin, before the connecting section is electrically connected to one of the two cell contact sections via the contacting section. In this way, the connecting section provides a sufficient cross-section for the transmission of the electrical current, while simultaneously achieving a challenging mechanical connection between the comparatively thick connecting section and the comparatively thin cell contact section using the comparatively thin contacting section.

In the present context, "essentially cylindrical" can refer to the presence of a chamfer as well as - alternatively or additionally - a rounding at a transition, in particular a circumferential and/or edge-like one, between an end face. The term "essentially cylindrical" refers to the essentially cylindrical nature of the battery cell and its outer surface. Alternatively or additionally, "essentially cylindrical" can refer to the presence of an unevenness and/or profile on at least one of the end faces of the battery cell. "Essentially cylindrical" can also refer to a convex shape, particularly of the outer surface.

In this context, "essentially cylindrical" can refer, in particular alternatively or additionally, to the shape of a general cylinder. It is therefore conceivable that the essentially cylindrical battery cell, for example, has a prismatic, particularly cuboid, shape. Preferably, the essentially cylindrical battery cell has an essentially circular cylindrical shape. The essentially circular cylindrical battery cell can be synonymously referred to as a "round battery cell." In particular, the essentially cylindrical battery cell is not a pouch cell.

Any "thicknesses" mentioned in this context may be measured along an extreme, i.e., minimum or maximum, extent of the section exhibiting the thickness, particularly if it is planar. Specifically, the contact section thickness is measured at a minimum extent of the contact section. Specifically, the connection section thickness is measured at a maximum extent of the connection section. Alternatively or additionally, any thicknesses may be referenced to average thicknesses. In particular, a given thickness may be measured along the cell height direction, especially if the section exhibiting the thickness extends planarly and—alternatively or additionally—longitudinally perpendicular to the cell height direction.

The terms "configured" or "set up" can be used synonymously with the term "trained".

The terms "include" or "have" can be used synonymously with the term "exhibits".

The phrase “as well as – alternatively or additionally –” can be replaced by “and/or”.

The connecting section is expediently connected electrically to one of the two cell contact sections only indirectly via the contacting section.

The contacting section is expediently present only in an area of the connection device in which the connection device electrically contacts one of the two cell contact sections, in particular by direct contact.

It is advantageous for the contact section to be thinner relative to the connection section and - alternatively or additionally - thinner.

The essentially cylindrical battery cell expediently has an axial cell height and a cell diameter measured perpendicular to the cell height. The cell diameter can range from 10 mm to 30 mm. Alternatively or additionally, the cell height can range from 40 mm to 78 mm.

In an embodiment of the invention, the two cell contact sections of the battery cell are arranged opposite each other along the cell height direction and – alternatively or additionally – particularly at their end faces. Alternatively or additionally, the two cell contact sections of the battery cell are arranged offset from each other perpendicular to the cell height direction, particularly radially. Each cell contact section can be formed by a disc-shaped and/or cap-shaped contact element of the battery cell.

According to the invention, in particular at least one of the two cell contact sections has a cell contact section thickness of 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm. Additionally, the contacting section thickness is 0.05 mm to 0.4 mm, in particular 0.15 mm to 0.3 mm. Additionally, the connecting section has a connecting section thickness of 0.4 mm to 1.0 mm, in particular 0.5 mm to 0.7 mm.

The thickness of the connecting section can be appropriately 1.5 to 5 times the thickness of the cell contact section, as well as – alternatively or additionally – the thickness of the contacting section.

In a further embodiment of the invention, one of the two cell contact sections is connected to the contacting section by a material bond as well as - alternatively or additionally - by a form bond as well as - alternatively or additionally - by a force bond.

Advantageously, one of the two cell contact sections is welded to the contacting section, particularly without filler material. One of the two cell contact sections can be welded to the contacting section by laser welding or by resistance welding, particularly without filler material. Alternatively or additionally, one of the two cell contact sections can be welded, either alternatively or additionally, by The contact section shall be electrically connected by means of hook and loop welding, screws, clinching, riveting, soldering, gluing and press-fit, in particular by means of cutting contacts provided on one of the two cell contact sections and - alternatively or additionally - on the contact section.

In a further embodiment of the invention, one of the two cell contact sections comprises a nickel-plated steel sheet material. Alternatively or additionally, the contacting section comprises a nickel-plated steel sheet material, in particular the same, identical, or a different one, as well as—alternatively or additionally—a copper sheet material. Alternatively or additionally, the connecting section comprises a copper sheet material.

The steel sheet material appropriately corresponds to the standard designation "CC01".

The copper sheet material can suitably consist of pure copper (Cu). Alternatively, the copper sheet material can consist of or be made of a copper alloy with at least 98% copper (Cu) by mass.

According to the invention, the contacting section is arranged sandwich-like directly and without overhang between one of the two cell contact sections and the connecting section. Additionally, the connecting section can be arranged transversely to the cell height direction, and in particular projecting beyond one of the two cell contact sections.

In a further embodiment of the invention, the contacting section is integrally integrated into the connecting section and—alternatively or additionally—integrally integrated into one of the two cell contact sections. Alternatively or additionally, the connecting section is folded over the contacting section and—alternatively or additionally—bent over. The connecting section can thus be at least partially enveloped and/or surrounded by the contacting section. Alternatively or additionally, the connecting section can be at least partially enveloped and/or surrounded by the cell contact section. It is also conceivable that the contacting section is bent over the connecting section and/or that the connecting section is folded over itself.

In a further embodiment of the invention, the contact section is provided by a component of the battery pack, which component is configured differently, in particular separately, from the connection section and – alternatively or additionally – differently, in particular separately, from one of the two cell contact sections. It is understood that this embodiment of the invention can be an alternative to the embodiment of the invention mentioned in the preceding paragraph of description.

In a further embodiment of the invention, the component has a folding section that is distinct from the contacting section and, in particular, that is integrally integrated into the contacting section. The folding section is folded together with the connecting section in such a way that the connecting section is arranged between the folding section and the contacting section, in particular wherein the connecting section is directly connected to the folding section and to the contacting section, as well as – alternatively or additionally – by a material bond.

In a further embodiment of the invention, one of the two cell contact sections has a connection zone, in particular annular in shape. The contacting section is connected to the one of the two cell contact sections directly and – alternatively or additionally – by a material bond exclusively within the connection zone. In particular, the annular connection zone surrounds a central, in particular circular, area in which there is no connection, in particular no material bond, between the contacting section and the one of the two cell contact sections.

Advantageously, the material-bonded connection can be created along a connecting path, in particular along a weld bead. The connecting path can be rounded, in particular circular or spiral, and/or angular, in particular polygonal, at least in some areas. Alternatively or additionally, the connecting path can be straight, at least in some areas. It is understood that, alternatively or additionally to the connecting path, at least one connection point, in particular at least one weld point, can also be provided.

In a further embodiment of the invention, the battery cell has an electrical impedance, wherein the value of the battery cell impedance when an alternating current is applied to the two cell contact sections at an alternating current frequency of 1 kHz, with a state of charge (SOC) of 50% and a battery cell temperature of 20 °C to 25 °C, is less than 10 mΩ (milliohms). In particular, only the real part, and not the imaginary part, of the battery cell impedance is considered for the value of the battery cell impedance. Specifically, the value of the electrical battery cell impedance when the alternating current is applied is less than 10 mΩ (milliohms). currents with an alternating current frequency of 1 kHz at an electrical charge level of 50% and at a temperature of 20 °C to 25 °C less than 5 mΩ, in particular less than or equal to 3 mΩ.

In particular, the value of the electrical impedance of the battery cell when an alternating current with an alternating current frequency of 1 kHz is applied at an electrical charge level of 50% and at a battery cell temperature of 20 °C to 25 °C 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.

The state of charge of 50% can be conveniently determined as follows: The battery cell can be charged to a predetermined nominal voltage, particularly one defined by the manufacturer, where the nominal voltage corresponds to a state of charge of 50%. Alternatively or additionally, the battery cell can first be fully discharged or charged, and then charged or discharged to exactly 50% of its capacity, thus achieving and/or setting a state of charge of 50%. It is understood that other and/or combined methods of determination may be appropriate.

The impedance of a battery cell can be conveniently determined as follows: An alternating current with a fixed frequency of 1 kHz is applied to the battery cell, and the resulting AC voltage response of the battery cell is measured. "Applying" can be understood synonymously with "applying." The battery cell impedance, and in particular its value, is calculated as the AC resistance (z = u/i) from the ratio of the measured AC voltage u to the AC current i.

The battery cell is preferably a multitab cell with at least one multitab electrode and - alternatively or additionally - a tabless cell with at least one tabless electrode.

The Tabless cell, in particular configured as a Tabless cylindrical cell, can be expediently designed according to US 2020/0144676 A1 The Tabless cell can be synonymously referred to as an "Endless-Tab cell" with at least one Endless-Tab electrode, as well as - alternatively or additionally - as an "Earless-Tab cell" with at least one Earless-Tab electrode, as well as - alternatively or additionally - as an "Ear-Free cell" with at least one Ear-Free electrode, as well as - alternatively or additionally - as a "Continuous-Tab cell" with at least one Continuous-Tab electrode, as well as - alternatively or additionally - as a "Full-Tab cell" with at least one Full-Tab electrode.

Advantageously, battery cells can generally have two wound electrodes, separated from each other, particularly by a separator within the respective battery cell, especially in a sandwich-like arrangement. In a battery cell, particularly one not designed as a tabless cell and/or not as a multitab cell, at least one of the electrodes can have, in particular, integral, spaced-apart connection sections (tabs) at one of its axial ends for electrically connecting this electrode to one of the two cell contact sections of the battery cell. The spaced-apart connection sections can form constrictions for the electric current flowing between the respective electrode and the respective cell contact section, which can result in a relatively high battery cell impedance of such battery cells.

Advantageously, the Tabless cell, particularly in contrast to a battery cell not designed as a Tabless cell, can have at least one Tabless electrode, in particular a wound one, wherein the Tabless electrode has at one of its axial ends only a single, in particular integral, and—alternatively or additionally—extending over the entire length of the Tabless electrode around a winding axis of the Tabless electrode, in particular spirally, connection section for electrically connecting this Tabless electrode to the respective of the two cell contact sections. The Tabless electrode thus, in particular, does not have multiple connection sections.

Advantageously, 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 in particular are each radially bent in such a way that two adjacent connection sections touch each other and - alternatively or additionally - overlap each other.

It is understood that hybrid battery cell designs are conceivable, in which, for example, the two electrodes belong to different electrode types. It may even be conceivable that a single electrode belongs to different electrode types, for example, if its axial ends are shaped differently.

In a further embodiment of the invention, the electric battery pack has a number of The connection device comprises specially designed, identical battery cells. It has a number of electrically conductive contact sections, each of which is directly electrically connected to one of the two cell contact sections of one of the battery cells. The contact sections are directly electrically connected to the same connection section, so that the connection section is indirectly electrically connected to one of the two cell contact sections of the battery cells via the contact sections, in particular for current collection, and alternatively or additionally for current distribution. The number of battery cells and the number of contact sections of the connection device can be 1. The number of battery cells and the number of contact sections of the connection device can be a plurality. The number of battery cells can correspond to the number of contact sections of the connection device. Preferably, the number is 1 to 500, in particular 3 to 200. If the number is greater than 1, the connection device can serve as an electrical interconnection of the battery cells.

In a further embodiment of the invention, the battery pack has another, in particular identically or differently designed, electrically conductive connection device. The battery pack can therefore have at least two electrically conductive connection devices. The other electrically conductive connection device can be configured to conduct electric current to other cell contact sections of the battery cells and – alternatively or additionally – away from other cell contact sections of the battery cells. One of the connection devices can be connected to an electrical negative path of the battery pack, and the other connection device can be connected to an electrical positive path of the battery pack.

Advantageously, at least one connection device can define an electrical connection path of the battery pack, wherein the electrical connection path connects at least two battery cells of the battery pack to each other. Advantageously, the connection path can electrically connect at least two packs of battery cells to each other, in particular wherein the packs are electrically connected in parallel or in series by means of the connection path. The battery cells belonging to a pack can be electrically connected in series or in parallel to each other within the pack.

A method according to the invention serves for the production, in particular at least partial production, of an electric battery pack according to the invention as described above. The advantages of the electric battery pack according to the invention can thus be exploited by means of the method according to the invention. The method comprises a step a) in which a substantially cylindrical battery cell is provided, wherein the battery cell extends axially along a cell height direction and has two cell contact sections. The method also comprises a step b) in which an electrically conductive contact section for the electrically conductive connection device and an electrically conductive connection section for the electrically conductive connection device are provided. Furthermore, the method comprises a step c) in which the contact section is electrically connected to one of the two cell contact sections. In particular, the electrical connection according to step c) is made through the contact section. In particular, as a result of the electrical connection according to step c), one of the two cell contact sections can be reinforced, in particular with respect to thickness, by means of the contact section. Reinforcement can be particularly advantageous if the electrical connection according to step c) involves heat input. Furthermore, the method includes a step d) in 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 one of the two cell contact sections.

It is advantageous to carry out step d) directly concurrently with step b), especially if the connecting section and the contacting section are formed in one piece.

It is advantageous to consider 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 from the interior of the battery cell, especially through a cell housing of the battery cell.

If a component for the battery pack has a contact section that also has a reversing section, it is advantageous to first position the connecting section at the reversing section. The connecting section can then be directly connected to the reversing section, or alternatively or additionally, by a material bond. If the connecting section is directly connected to the reversing section, or alternatively or additionally, by a material bond, the The folding section, together with the attached connecting section, can be folded onto the contacting section and – alternatively or additionally – bent so that the connecting section is positioned between the folding section and the contacting section, particularly along the cell height direction. Subsequently, the connecting section can be directly connected to the contacting section, particularly through the folding section, and – alternatively or additionally – by a material bond. The contacting section may have already been electrically connected to one of the two cell contact sections beforehand, or it may be electrically connected to one of the two cell contact sections afterward.

In an 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, is achieved by a material-bonded connection, in particular by welding, especially without filler material, particularly by laser welding or resistance welding. Alternatively or additionally, the electrical connection according to step c) and alternatively or additionally, according to step d), can be achieved by means of hook-and-loop welding, alternatively or additionally, by means of screws, alternatively or additionally, by clinching, alternatively or additionally, by riveting, alternatively or additionally, by soldering, alternatively or additionally, by adhesive bonding, and alternatively or additionally, by means of press-fit connections, in particular by means of cutting contacts provided on 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 prior to steps c) and d), with step c) being carried out prior to or simultaneously with step d). Alternatively or additionally, steps a) to d), in particular for each connecting device, and alternatively or additionally, multiple times, are carried out for a number of battery cells for the battery pack and for a number of contacting devices for electrically contacting one of the two cell contact sections of each of the battery cells.

It is advantageous to perform steps a) and b) multiple times before performing step c) multiple times. In particular, step c) can either be performed multiple times before step d) is performed multiple times, or multiple times simultaneously with step d). Alternatively or additionally, it is also conceivable that steps a) to d) are performed multiple times consecutively in an iterative loop. In particular, steps a) to d) can be performed first for one connection device and then for the other, or simultaneously for both connection devices.

An electrical battery system according to the invention comprises an electrical battery pack according to the foregoing description. In particular, the electrical battery pack of the electrical battery system is manufactured, especially at least partially, by a method according to the invention described above. The electrical battery system also comprises an electrical battery device which has a receiving device for interchangeably receiving and electrically connecting the battery pack to the battery device.

In one embodiment of the invention, the electric battery device is an electric processing device that can be supplied with electrical energy by means of the integrated battery pack. Alternatively or additionally, the electric battery device is an electric charger for electrically recharging the integrated battery pack.

The battery-powered tool, designed as a processing device, is suitable for ground-based and/or handheld operation, particularly hand-carried and/or backpack-carried operation, and/or for garden, forestry, soil, and/or construction work. The processing device may be hand-held, meaning that, in particular, the processing direction of the device can be adjusted relative to a workpiece currently being processed by the user's hand guiding the device. Specifically, the processing device may be a saw, especially a chainsaw, or a pole pruner, or a hedge trimmer, or a hedge cutter, or a shrub pruner, or a branch cutter, an angle grinder, or a blower, or a leaf blower, or a vacuum, or a leaf vacuum, or a cleaning device, or a pressure washer, or a sweeper, or a sweeping roller, or a sweeping brush, or a lawnmower, or grass shears, or a brush cutter, or a scarifier. Additionally or alternatively, the processing device may include a processing tool and/or a drive motor, particularly an electric one, especially for driving the processing tool. The drive motor may be powered by electrical energy from the battery pack, particularly to provide drive power for the processing tool.

The battery-powered device, which also functions as a charger, conveniently features a mains connection for electrical connection to an electrical power source, for example, an electrical outlet. The charger can be used to charge the connected battery pack with electrical energy from the power source. The charger may include an electronic charge controller.

It is understood that the battery-powered device, designed as a processing tool, may have a mains connection for electrical connection to a power source, such as an electrical supply network, in order to charge the battery pack with electrical energy from the power source. In this respect, the battery-powered device can be dual-functional, serving both as a processing tool and as a charger.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and features of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings. In this context, identical reference numerals refer to identical, similar, or functionally equivalent components.

• 1 zeigt in schematischer Seitenansicht eine Ausführungsform eines erfindungsgemäßen elektrischen Akkupacks,
• 2 ein Detail der Seitenansicht nach 1,
• 3 in schematischer Seitenansicht eine weitere Ausführungsform des erfindungsgemäßen elektrischen Akkupacks,
• 4 in schematischer Seitenansicht eine weitere Ausführungsform des erfindungsgemäßen Akkupacks,
• 5 in schematischer Draufsicht eine weitere Ausführungsform des erfindungsgemäßen elektrischen Akkupacks,
• 6 ein schematisches Ablaufschaubild für die Durchführung einer Ausführungsform eines erfindungsgemäßen Verfahrens für eine Herstellung eines erfindungsgemäßen elektrischen Akkupacks, insbesondere gemäß den 1 bis 5,
• 7 in schematischer Seitenansicht eine weitere Ausführungsform eines erfindungsgemäßen elektrischen Akkupacks,
• 8 in schematischer Perspektivdarstellung ein als elektrisches Ladegerät ausgebildetes elektrisches Akkugerät für eine Ausführungsform eines erfindungsgemäßen elektrischen Akkusystems, und
• 9 in schematischer Seitenansicht eine Ausführungsform des elektrischen Akkusystems mit einem als elektrisches Bearbeitungsgerät ausgebildeten elektrischen Akkugerät und mit dem Akkupack gemäß 7.

It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

• 1 shows a schematic side view of an embodiment of an electrical battery pack according to the invention,
• 2 a detail of the side view 1 ,
• 3 A further embodiment of the electrical battery pack according to the invention is shown in a schematic side view.
• 4 A further embodiment of the battery pack according to the invention is shown in a schematic side view.
• 5 a schematic top view of another embodiment of the electrical battery pack according to the invention,
• 6 a schematic flowchart for carrying out an embodiment of a method according to the invention for manufacturing an electrical battery pack according to the invention, in particular according to the 1 to 5 ,
• 7 A further embodiment of an electrical battery pack according to the invention is shown in a schematic side view.
• 8 in a schematic perspective view an electrical battery device designed as an electrical charger for an embodiment of an electrical battery system according to the invention, and
• 9 schematic side view of an embodiment of the electric battery system with an electric battery device designed as an electric processing device and with the battery pack according to 7 .

DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

An electric battery pack 1 is intended for use in 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 comprises an electric battery pack 1. The battery system 100 also comprises an electric battery device 50. The electric battery device 50 has a receiving device 51 designed for the interchangeable receiving and, in particular, detachable electrical connection of the battery pack 1 to the battery device 50. The electric battery device 50 is, for example, an electric processing device 52 that can be supplied with electrical energy by means of the received battery pack 1 (shown in 9 ) trained. Alternatively or additionally, the electric battery device 50 can be used as an electric charger 53 (shown in 8 ) designed for electrically charging the received battery pack 1.

At the in 9 The electrical processing device 52 shown is an electric chainsaw. The processing device 52 includes, for example, a processing tool – in this case, a saw chain. Alternatively or additionally, the processing device 52 can include a drive motor, in particular an electric one, which can be used to drive the processing tool. For example, the drive motor can be supplied with electrical energy from the integrated battery pack 1 to provide drive power for the processing tool.

The battery device 50, designed as a charger 53, has, for example, a mains connection for electrical connection to an electrical energy source, such as an electrical power supply network. The charger 53 serves, for example, to charge the connected 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-powered device 50, designed as a processing device 52, has a - pre- The battery pack 1 may have a mains connection (not shown) for electrical connection to an electrical power source, for example in the form of an electrical supply network, in order to charge the battery pack 1 with electrical energy from the electrical power source. In this respect, the battery device 50 can be dual-functional, serving both as a processing device 52 and as a charger 53.

The battery pack 1 comprises at least one substantially cylindrical 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 this case, the battery cell 2 is designed as a substantially circular cylindrical battery cell 2, i.e., as a cylindrical battery cell.

Battery cell 2 has a cell height measured along the cell height direction Z. Furthermore, battery cell 2 has, for example, a cell diameter measured radially, perpendicular to the cell height. The cell diameter can be between 10 mm and 30 mm. Alternatively or additionally, the cell height can be between 40 mm and 78 mm.

The battery pack 1 also has at least one electrically conductive connection device 30, 30A, 30B. The connection device 30, 30A, 30B serves to conduct electric current to one of the two cell contact sections 3, 3A, 3B and – alternatively or additionally – away from one of the two cell contact sections 3, 3A, 3B. With regard to the 1 to 4 The connecting device 30, 30A can be used to conduct electric current to the cell contact section 3, 3A, whereas the other connecting device 30, 30B is used to conduct electric current away from the other of the two cell contact sections 3, 3B, particularly in both cases when the battery pack 1 is being discharged. When the battery pack 1 is being charged, the electric current can be conducted in the opposite direction.

The electrically conductive connecting device 30, 30A, 30B has an electrically conductive contact section 4, 4A, 4B. The contact section 4, 4A, 4B serves to electrically contact one of the two cell contact sections 3, 3A, 3B. The contact section 4, 4A, 4B is electrically and directly mechanically connected to one of the two cell contact sections 3, 3A, 3B. The contact section 4, 4A, 4B can therefore touch 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 to conduct electrical current to the contacting section 4, 4A, 4B and – alternatively or additionally – away from the contacting section 4, 4A, 4B. With regard to the 1 to 4 The connecting section 5, 5A can be used to conduct electrical current to the contacting section 4, 4A, whereas the other connecting section 5, 5B is used to conduct electrical current away from the other contacting section 4, 4B, particularly when the battery pack 1 is being discharged. The contacting section 4, 4A, 4B connects the connecting section 5, 5A, 5B electrically and indirectly mechanically to 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 contact section 4, 4A, 4B has a contact section thickness 7. The connection section 5, 5A, 5B has a connection section thickness 8. For example, the connection section 5, 5A, 5B has a connection section thickness 8, particularly at least or exclusively, away from the contact section 4, 4A, 4B. Alternatively or additionally, the connection section 5, 5A, 5B can have a connection section thickness 8 at the contact section 4, 4A, 4B, i.e., particularly in a region where the connection section 5, 5A, 5B contacts the contact section 4, 4A, 4B. The contact section thickness 7 is less than the connection section thickness 8.

For example, the connecting section 5, 5A, 5B is electrically connected to one of the two cell contact sections 3, 3A, 3B exclusively indirectly via the contacting section 4, 4A, 4B. The contacting section 4, 4A, 4B can essentially only be present in a region of the connecting device 30, 30A, 30B in which the connecting device 30, 30A, 30B electrically contacts one of the two cell contact sections 3, 3A, 3B, in particular by direct contact.

The contacting section 4, 4A, 4B may be tapered and/or thinned in thickness relative to the connecting section 5, 5A, 5B.

The two cell contact sections 3, 3A, 3B of battery cell 2 can be arranged opposite each other along the cell height direction Z and – alternatively or additionally – at their ends. In this case, the two cell contact sections 3, 3A, 3B are arranged opposite each other along the cell height direction Z. The two cell contact sections 3, 3A, 3B of the battery cell 2 are arranged superimposed and at their end faces. Alternatively or additionally, they can be arranged offset from each other perpendicular to the cell height direction Z, in particular radially.

At least one of the two cell contact sections 3, 3A, 3B, in this case each of them, has a cell contact section thickness 6. The cell contact section thickness 6 is, for example, 0.05 mm to 0.4 mm, in this case 0.15 mm to 0.3 mm. Alternatively or additionally, the contact section thickness 7 is 0.05 mm to 0.4 mm, in this case 0.15 mm to 0.3 mm. The cell contact section thickness 6 can be the same as the contact section thickness 7.

The connecting section 5, 5A, 5B can have a connecting section thickness of 8. The connecting section thickness 8 can be from 0.4 mm to 1.0 mm. In this case, the connecting section thickness 8 is from 0.5 mm to 0.7 mm.

For example, the connection section thickness 8 corresponds to 1.5 to 5 times the cell contact section thickness 6. Alternatively or additionally, the connection section thickness 8 can correspond to 1.5 to 5 times the contacting section thickness 7.

The connecting section 5, 5A, 5B can be multi-layered, in particular wherein the connecting section thickness 8 can comprise several, in particular all, layers of the connecting section 5, 5A, 5B.

One of the two cell contact sections 3, 3A, 3B is, for example, metallurgically bonded to the contacting section 4, 4A, 4B. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be positively bonded to the contacting section 4, 4A, 4B, and—alternatively or additionally—force-fitted. In this case, one of the two cell contact sections 3, 3A, 3B is welded to the contacting section 4, 4A, 4B, for example, without filler metal. One of the two cell contact sections 3, 3A, 3B can be connected to the contacting section 4, 4A, 4B by laser welding and/or resistance welding.

Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected by hook and loop welding. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected to the contact section 4, 4A, 4B by screws. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected to the contact section 4, 4A, 4B by clinching. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected to the contact section 4, 4A, 4B by riveting. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected to the contact section 4, 4A, 4B by soldering. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be connected to the contact section 4, 4A, 4B by adhesive bonding. Alternatively or additionally, one of the two cell contact sections 3, 3A, 3B can be press-fitted to the contacting section 4, 4A, 4B. To connect 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 one of the two cell contact sections 3, 3A, 3B and/or on the contacting section 4, 4A, 4B.

In the drawings of 1 , 3 and 4 Empty triangles are visible, indicating the respective connection of contact section 4, 4A, 4B with cell contact section 3, 3A, 3B and/or the respective connection of connection section 5, 5A, 5B with contact section 4, 4A, 4B. The triangles can illustrate a laser beam focused on a specific welding area for the connection.

One of the two cell contact sections 3, 3A, 3B, for example, has a nickel-plated steel sheet material. The contacting section 4, 4A, 4B can have a nickel-plated steel sheet material and – alternatively or additionally – a copper sheet material. Alternatively or additionally, the connecting section 5, 5A, 5B has a copper sheet material.

The copper material may be pure copper (Cu). The copper sheet material may be a copper alloy with at least 98% copper (Cu) by mass, or may consist of such a copper alloy. The steel sheet material may conform to the standard designation "CC01".

The two cell contact sections 3, 3A, 3B can be of the same or different types.

For example, the contacting section 4, 4A, 4B is arranged in a sandwich-like manner directly, in particular projecting or without a projection, between 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 transversely to the cell height direction Z, in particular projecting, relative to one of the two cell contact sections 3, 3A, 3B.

For example, the contacting section 4, 4A, 4B integrally transitions into the connecting section 5, 5A, 5B, cf. 1 below. Alternatively or additionally, the contacting section 4, 4A, 4B can be integrally integrated into one of the cell contacting sections 3, 3A, 3B.

The connecting section 5, 5A, 5B can be folded over and/or bent onto the contacting section 4, 4A, 4B, as indicated in particular by the dashed lines in 3 and 4 .

For example, the contact section 4, 4A, 4B is provided by a component 20 of the battery pack 1. This component 20 can be configured differently from the connecting section 5, 5A, 5B and – alternatively or additionally – from one of the two cell contact sections 3, 3A, 3B, in particular separately. The component 20, for example, has a repositioning section 9 that is different from the contact section 4, 4A, 4B, in particular one that is integrally integrated into the contact section 4, 4A, 4B. The repositioning section 9 can be repositioned together with the connecting section 5, 5A, 5B such that the connecting section 5, 5A, 5B is arranged between the repositioning section 9 and the contact section 4, 4A, 4B. The connecting section 5, 5A, 5B can be directly and/or materially connected to the rerouting section 9 and to the contacting section 4, 4A, 4B.

As particularly evident from the 5 As can be seen, one of the two cell contact sections 3, 3A, 3B can have a connection zone 11, for example, annular in shape. The contacting section 4, 4A, 4B is directly and/or metallurgically bonded to one of the two cell contact sections 3, 3A, 3B exclusively within the connection zone 11. The metallurgical bond can be formed along a connecting path, in particular along a weld line. The connecting path can be rounded, in particular circular or spiral, at least in some areas. Alternatively or additionally, the connecting path can be angular, in particular polygonal, at least in some areas. It is also conceivable that the connecting path is straight, at least in some areas. It is understood that, alternatively or additionally to the connecting path, a connection point, in particular several connection points, can also be provided.

For example, battery cell 2 has an electrical impedance. The impedance value is less than 10 mΩ when an alternating current with an alternating current frequency of 1 kHz is applied to the two cell contact sections 3, 3A, 3B of battery cell 2, with a state of charge of 50% and a temperature of 20 °C to 25 °C.

The battery cell 2 is, for example, configured as a multitab cell with at least one multitab electrode and – alternatively or additionally – as in the present case – as a Tabless cell 12 with at least one Tabless electrode 13. The Tabless electrode 13 is, for example, wound. The Tabless electrode 13 can have at at least one of its axial ends only a single, in particular integral and/or extending over the entire length of the Tabless electrode 13 around a winding axis of the Tabless electrode 13, connection section (English: “tab”) for electrically connecting the Tabless electrode 13 to the corresponding one of the two cell contact sections 3, 3A, 3B. The Tabless electrode 13 therefore does not have multiple connection sections in the present case. In contrast to the tableless cell 12, a multitab electrode of a multitab cell can have a plurality of connection sections, in particular arranged directly consecutively, which are in particular bent radially such that two adjacent connection sections touch and/or overlap each other. It is understood that hybrid forms of battery cells 2 are conceivable.

The electrical impedance of the battery cell can 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 electrical impedance of the battery cell can be less than 5 mΩ, in particular less than or equal to 3 mΩ.

The electric battery pack 1, for example, comprises a number of battery cells 2, in particular of identical design. The connecting device 30, 30A, 30B can have a number of electrically conductive contact sections 4, 4A, 4B, each of which is directly electrically connected to one of the two cell contact sections 3, 3A, 3B of one of the battery cells 2. The contact sections 4, 4A, 4B can each be directly electrically connected to the connecting section 5, 5A, 5B, in particular of the same type, so that the connecting section 5, 5A, 5B is indirectly electrically connected to one of the two cell contact sections 3, 3A, 3B of the battery cells 2 by means of the contact sections 4, 4A, 4B.

The number of battery cells 2 and/or the number of contact sections 4, 4A, 4B of the connection device 30, 30A, 30B can be 1. The number of battery cells 2 and/or the number of contact sections 4, 4A, 4B of the connection device 30, 30A, 30B can be a plurality. The number of battery cells 2 can correspond to the number of contact sections 4, 4A, 4B of the connection 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 identical, that is to say, in particular, all battery cells 2 can be of the same type.

The battery pack 1 can have two connection devices 30, 30A, 30B, i.e., as in the present case, one connection device 30, 30A and another connection device 30, 30B. The connection device 30, 30A can be configured to conduct electrical current to one of the two cell contact sections 3, 3A of the battery cells 2. In contrast, the other connection device 30, 30B can serve to conduct electrical current away from the other of the two cell contact sections 3, 3B of the battery cells 2.

According to the 1 to 4 The connecting device 30, 30A is, for example, designed differently from the other connecting device 30, 30B. It is understood that the connecting device 30, 30A can also be designed in the same way as the other connecting device 30, 30B. It is understood that the 1 to 4 For example, connecting devices 30, 30A, 30B can be expediently combined in other embodiments.

In 7 An outer casing of battery pack 1 is visible, which may enclose the internal components of battery pack 1. The internal components of battery pack 1 according to 7 is realized, for example, as in the 1 to 4 exemplified. In other words: In particular, the 1 to 4 only the internal components of battery pack 1, specifically without the housing of battery pack 1.

The electric battery pack 1 can be manufactured, in particular at least partially, by a method V. The method V comprises a step a) in which at least one substantially cylindrical battery cell 2 is provided, wherein the battery cell 2 extends axially along the cell height direction Z and has two cell contact sections 3, 3A, 3B. The method V also comprises a step b) in which an electrically conductive contacting section 4, 4A, 4B is provided for the electrically conductive connecting device 30, 30A, 30B. Furthermore, according to step b), an electrically conductive connecting section 5, 5A, 5B is provided for the electrically conductive connecting 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. Method V also includes a step c) in which the contacting section 4, 4A, 4B is electrically connected to one of the two cell contact sections 3, 3A, 3B. Furthermore, method V includes a step d) in 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 one of the two cell contact sections 3, 3A, 3B.

As exemplified in 3 As indicated by the dashed lines, the connecting section 5, 5B can be positioned on the folding section 9. The connecting section 5, 5B can then be directly and/or metallurgically connected to the folding section 9. Once the connecting section 5, 5B is directly and/or metallurgically connected to the folding section 9, the folding section 9, together with the attached connecting section 5, 5B, can be folded and/or bent onto the contacting section 4, 4B, so that the connecting section 5, 5B is positioned, for example, along the cell height direction Z, between the folding section 9 and the contacting section 4, 4B. The connecting section 5, 5B can then be directly and/or metallurgically connected to the contacting section 4, 4B, for example, through the folding section 9. The contacting section 4, 4B may already have been electrically connected to one of the two cell contact sections 3, 3B in advance, or may subsequently be electrically connected to one of the two cell contact sections 3, 3A.

For example, the electrical connection according to step c) and/or step d) is achieved by material bonding. Material bonding according to step c) and/or step d) can be achieved by welding, for example, without filler metal. In this case, the electrical connection according to step c) and/or step d) is achieved by laser welding and/or resistance welding.

For example, steps a) and b) of procedure V are carried out before steps c) and d). Step c) can be carried out before or at the same time as step d).

Steps a) to d) of procedure V can be performed multiple times. For example, steps a) to d) can be performed once or multiple times for each connection device 30, 30A, 30B. Steps a) to d) can be performed for a number of battery cells 2 for the battery pack 1, in particular for each connection device 30, 30A, 30B and/or multiple times. In addition, steps a) to d) can be performed for a number of The timing devices 4, 4A, 4B are used to electrically contact one of the two cell contact sections 3, 3A, 3B of each of the battery cells 2, in particular each connection device 30, 30A, 30B and/or multiple times.

For example, steps a) and b) can be performed multiple times before step c) is performed multiple times. In particular, step c) can be performed multiple times before step d) is performed multiple times, or multiple times simultaneously with step d). Alternatively or additionally, it is also conceivable that steps a) to d) are performed multiple times consecutively in an iterative loop. In particular, steps a) to d) can be performed first for one and then for the other connection device 30, 30A, 30B, or simultaneously for both connection devices 30, 30A, 30B.

Claims (18)

An electric battery pack (1) for an electric battery system (100), wherein the electric battery pack (1) comprises: - at least one substantially cylindrical electric battery cell (2) extending axially along a cell height direction (Z) and comprising two electric cell contact sections (3, 3A, 3B), wherein the two cell contact sections (3, 3A, 3B) are electrically polarized in an electrically charged state of the battery cell (2), - at least one electrically conductive connecting device (30, 30A, 30B) for conducting electric current to and/or away from one of the two cell contact sections (3, 3A, 3B), wherein the connecting device (30, 30A, 30B) comprises: - an electrically conductive contacting section (4, 4A, 4B) for electrically contacting one of the two cell contact sections (3, 3A, 3B), wherein the contacting section (4, 4A, 4B) is electrically and directly mechanically connected to one of the two cell contact sections (3, 3A, 3B), and an electrically conductive connecting section (5, 5A, 5B) for conducting electric current to and/or 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 one of the two cell contact sections (3, 3A, 3B); - wherein the contact section (4, 4A, 4B) has a contact section thickness (7), - wherein the connection section (5, 5A, 5B) has a connection section thickness (8), - wherein the contact section thickness (7) is smaller than the connection section thickness (8), - wherein one of the two cell contact sections (3, 3A, 3B) has a cell contact section thickness (6) of 0.05 mm to 0.4 mm, - wherein the contact section thickness (7) is 0.05 mm to 0.4 mm, - wherein the connection section thickness (8) is 0.4 mm to 1.0 mm, and - wherein the contact section (4, 4A, 4B) is sandwiched directly and without overhang between one of the two cell contact sections (3, 3A, 3B) and the connection section (5, 5A, 5B) is arranged. Electric battery pack (1) according to the preceding claim, - wherein the two cell contact sections (3, 3A, 3B) of the battery cell (2) are arranged opposite each other along the cell height direction (Z) and/or at the end faces, and/or - wherein the two cell contact sections (3, 3A, 3B) of the battery cell (2) are arranged perpendicular to the cell height direction (Z), in particular radially, offset from each other. Electric battery pack (1) according to one of the preceding claims, - wherein the cell contact section thickness (6) is 0.15 mm to 0.3 mm, and/or - wherein the contacting section thickness (7) is 0.15 mm to 0.3 mm, and/or - wherein the connection section thickness (8) is 0.5 mm to 0.7 mm. Electric battery pack (1) according to one of the preceding claims, - wherein one of the two cell contact sections (3, 3A, 3B) is connected to the contacting section (4, 4A, 4B) by a material bond and/or a form-fit and/or a force-fit bond, - in particular wherein one of the two cell contact sections (3, 3A, 3B) is welded to the contacting section (4, 4A, 4B), in particular without filler material, in particular by laser welding or by resistance welding. Electric battery pack (1) according to one of the preceding claims, - wherein one of the two cell contact sections (3, 3A, 3B) comprises a nickel-plated steel sheet material; and/or - wherein the contacting section (4, 4A, 4B) comprises a nickel-plated steel sheet material and/or a copper sheet material; and/or - wherein the connecting section (5, 5A, 5B) comprises a copper sheet material. Electric battery pack (1) according to one of the preceding claims, - wherein the connecting section (5, 5A, 5B) is transverse offset to the cell height direction (Z), in particular projecting beyond, to which one of the two cell contact sections (3, 3A, 3B) is arranged. Electric battery pack (1) according to one of the preceding claims, - wherein the contacting section (4, 4A, 4B) integrally transitions into the connecting section (5, 5A, 5B) and/or integrally into one of the cell contact sections (3, 3A, 3B); and/or - wherein the connecting section (5, 5A, 5B) is folded and/or bent over the contacting section (4, 4A, 4B). Electric battery pack (1) according to one of the Claim 1 until 6 , - wherein the contacting section (4, 4A, 4B) is provided by a component (20) of the battery pack (1), which component (20) is different from the connecting section (5, 5A, 5B) and/or from one of the cell contact sections (3, 3A, 3B), in particular separately designed. Electric battery pack (1) according to the preceding claim, - wherein the component (20) has a repositioning section (9) that is distinct from the contacting section (4, 4A, 4B) and in particular is integrally integrated into the contacting section (4, 4A, 4B), - wherein the repositioning section (9) together with the connecting section (5, 5A, 5B) is repositioned such that the connecting section (5, 5A, 5B) is arranged between the repositioning section (9) and the contacting section (4, 4A, 4B), in particular wherein the connecting section (5, 5A, 5B) is directly and/or metallurgically connected to the repositioning section (9) and to the contacting section (4, 4A, 4B). Electric battery pack (1) according to one of the preceding claims, - wherein one of the two cell contact sections (3, 3A, 3B) has a connection zone (11), in particular annular, - wherein the contacting section (4, 4A, 4B) is directly and/or metallurgically connected to one of the two cell contact sections (3, 3A, 3B) exclusively within the connection zone (11). Electric battery pack (1) according to one of the preceding claims, - wherein the battery cell (2) has an electrical battery cell impedance, wherein a value of the battery cell impedance when an alternating current is applied to the two cell contact sections (3, 3A, 3B) with an alternating current frequency of 1 kHz at an electrical 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 is less than 10 mΩ; and/or - wherein the battery cell (2) is a multitab cell with at least one multitab electrode and/or a tabless cell (12) with at least one tabless electrode (13). An electric battery pack (1) according to one of the preceding claims, - wherein the electric battery pack (1) comprises a number of, in particular identically designed, battery cells (2), - wherein the connecting device (30, 30A, 30B) comprises a number of electrically conductive contact sections (4, 4A, 4B), each of which is directly electrically connected to one of the two cell contact sections (3, 3A, 3B) of one of the battery cells (2), - wherein the contact sections (4, 4A, 4B) are each directly electrically connected to the, in particular the same, connecting section (5, 5A, 5B), so that the connecting section (5, 5A, 5B) is indirectly electrically connected to one of the two cell contact sections (3, 3A, 3B) of the battery cells (2) by means of the contact sections (4, 4A, 4B), in particular by collecting and/or distributing current. Electric battery pack (1) according to the preceding claim, - wherein the battery pack (1) has another, in particular identically or differently designed, electrically conductive connecting device (30, 30A, 30B) for conducting electric current to other cell contact sections (3, 3A, 3B) of the battery cells (2) and/or away from other cell contact sections (3, 3A, 3B) of the battery cells (2). Method (V) for manufacturing an electric battery pack (1) according to any one of the preceding claims, wherein the method (V) comprises the steps of: a) providing a substantially cylindrical battery cell (2) extending axially along a cell height direction (Z) and having two cell contact sections (3, 3A, 3B); b) providing an electrically conductive contact section (4, 4A, 4B) for the electrically conductive connection device (30, 30A, 30B) and an electrically conductive connection section (5, 5A, 5B) for the electrically conductive connection device (30, 30A, 30B); c) electrically connecting the contact 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 one of the two cell contact sections (3, 3A, 3B). Method (V) according to the preceding claim, - wherein the electrical joining according to step c) and/or according to step d) is carried out by means of a material connection, in particular by welding, in particular without welding filler material, 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 performed prior to steps c) and d), with step c) being performed prior to or simultaneously with step d); and/or - wherein steps a) to d), in particular for each connection device (30, 30A, 30B) and/or multiple times, are performed for: - a number of battery cells (2) for the battery pack (1), - a number of contacting devices (4, 4A, 4B) for electrically contacting one of the two cell contact sections (3, 3A, 3B) of each of the battery cells (2). Electrical battery system (100) comprising: - an electrical battery pack (1) according to one of the Claims 1 until 13 , in particular manufactured by means of a method (V) according to one of the three preceding claims, - an electric battery device (50) which has a receiving device (51) for interchangeably receiving and thereby electrically connecting the battery pack (1). Electric battery system (100) according to the preceding claim, - wherein the electric battery device (50) is an electric processing device (52) that can be supplied with electrical energy by means of the received battery pack (1) and/or an electric charger (53) for electrically charging the received battery pack (1).