Battery device

Abstract

A battery device (1) comprises at least a housing (2) and at least one circular battery cell (3) arranged in the housing, which extends from a base area (4) with a cylindrical battery cell body (5) along a longitudinal axis (6) to a head area (7) and has a circular battery cell head (9) on the head area (7) protruding in the direction of the longitudinal axis (6) relative to the head area end face (8), and a first channel (10) extending from an inlet (11) through the housing (2) to an outlet (12); wherein the first channel (10) has at least one opening (13) through which the circular battery cell head (9) extends into the first channel (10); so that gas of the at least one circular battery cell (3) is discharged into the first channel (10) through the circular battery cell head (9).

Description

Technical Field

[0001] The present invention relates to a battery device comprising: a housing, at least one circular battery cell arranged therein or a module comprising a plurality of circular battery cells, and a channel. Background Art

[0002] A battery cell is an electrical storage device that is used, for example, in a motor vehicle to store electrical energy. In particular, for example, a motor vehicle has an electric motor for driving the motor vehicle, wherein the electric motor can be driven by the electrical energy stored in the battery cell.

[0003] For example, battery cells having a liquid electrolyte or a solid electrolyte (solid-state batteries) are known.

[0004] A module comprises, in particular, a battery cell or a plurality of battery cells electrically connected in series or in parallel. Individual modules can be electrically connected in series or in parallel. A battery arrangement comprises at least one module or, if necessary, a plurality of modules.

[0005] In the development of battery devices, a primary goal is to design the volume of the battery cells to be as large as possible and the housing surrounding the battery cells to be as small as possible, while all mechanical load conditions must be withstood without fire or short circuits.

[0006] To achieve maximum power and energy density, the components must be designed to be space-saving and as free of redundancy as possible. Furthermore, in addition to the installation space for the battery cells, sufficient space must also be left in the housing for the wiring and controller.

[0007] The primary driver is the z-dimensional chain (i.e., in the vertical direction of the vehicle), which inevitably requires a large accumulation due to the high-rise battery system in the vehicle floor. It is crucial to minimize the z-dimensional dimension, i.e., the height, of the battery system without neglecting or compromising existing requirements. Besides improved driving dynamics and improved flow resistance, the issue of vehicle accessibility is also a driving factor (e.g., space requirements).

[0008] In particular, the load paths for external crash situations (eg, pile impact sides) are to be moved directly into or integrated into the module housing, thereby providing more installation space for battery cells, for example.

[0009] US Pat. No. 8,944,198 B2 discloses an exhaust system for a battery of a motor vehicle. The exhaust system comprises a fan which is operated in the event of a crash to exhaust gases from the battery. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to at least partially solve the problems existing in the prior art. In particular, a battery device is proposed, by which the available installation space can be utilized as efficiently as possible.

[0011] This object is achieved by a battery arrangement having the features of claim 1. Advantageous further developments are the subject of the dependent claims. The features mentioned individually in the description can be combined with one another in a technically meaningful manner and can be supplemented by explanatory facts in the description and / or details in the drawings, which illustrate further embodiments of the invention.

[0012] A battery device is proposed, which comprises at least

[0013] ·The housing and the

[0014] at least one round battery cell, which extends from a base region with a cylindrical battery cell body along the longitudinal axis to a head region and has a round battery cell head on the head region that protrudes in the direction of the longitudinal axis relative to the end face of the head region, and

[0015] • A first passage extending through the housing from the inlet to the outlet.

[0016] The first channel has at least one opening through which the round battery cell head extends into the first channel, so that gas of the at least one round battery cell is discharged into the first channel through the round battery cell head.

[0017] In particular, at least one battery cell of the battery device serves as a supporting element. In the event of a crash, the crash energy can therefore be dissipated by deformation of the at least one battery cell.

[0018] At least one round battery cell, preferably a plurality of round battery cells, particularly preferably a plurality of modules each comprising a plurality of round battery cells, are arranged in the housing of the battery device. In this case, the round battery cells are arranged in the housing in particular with the highest possible packing density.

[0019] In particular, the round battery cell extends from a base region along a longitudinal axis with a cylindrical cell body to a head region, and has a round cell head protruding in the direction of the longitudinal axis relative to the end face of the head region. The cell body is composed of multiple layers of electrode sheets (anode and cathode) and separators. In particular, these layers and separators are initially arranged in a stacked manner and then wound around each other about the longitudinal axis to form a substantially cylindrical cell body.

[0020] In particular, the cell body has a constant cross section along the longitudinal axis, so that the base region end face and the head region end face have, in particular, the same dimensions.

[0021] The round battery cell has a round cell head in the head region. In particular, the round cell head has a smaller cross-section transversely to the longitudinal axis than the cell body or the end face of the head region. In particular, the round cell head is arranged substantially concentrically with respect to the end face of the head region, the cell body, or the longitudinal axis.

[0022] In the event of damage or a crash, components of the round cell, such as gases and / or electrolyte residues, are discharged from the round cell through the round cell head.

[0023] The first channel is also arranged in the housing. The first channel has an opening, in particular for each round battery cell arranged thereon (or in other words, the first channel has an opening, in particular for each round battery cell arranged thereon), through which the corresponding round battery cell head extends into the first channel. The contents of the round battery cell can be discharged into the first channel via the corresponding round battery cell head, so that these contents do not escape into the housing and damage other round battery cells located therein.

[0024] The at least one round battery cell can be arranged vertically or horizontally or in another installation position in the battery device and thus be arranged relative to the surroundings (in particular relative to the direction of gravity) during operation of the battery device.

[0025] In particular, a heat-conducting material is arranged between the head region end face and the first channel. In particular, the heat-conducting material enables particularly good heat dissipation from the round battery cell to the first channel or to the coolant flowing through the first channel.

[0026] In particular, the entire head region end face, optionally excluding the round battery cell heads extending through the opening, is thermally connected to the first channel via the heat-conducting material. In particular, heat is dissipated to the first channel via the entire head region (i.e., the head region end face and the round battery cell heads).

[0027] In particular, the opening is sealed relative to the housing, for example fluid-tight or gas-tight, by the heat-conducting material. That is, the heat-conducting material is particularly used to separate the volume arranged in the first channel from the volume arranged in the housing but outside the first channel and the corresponding round battery cell.

[0028] In particular, the base region is connected to the second channel in a heat-conducting manner. In particular, the base region is also connected to the second channel in a heat-conducting material or the heat-conducting material over as large an area as possible.

[0029] The second channel also has an inlet and an outlet. In particular, the second channel is acted upon by the coolant.

[0030] In particular, the round battery cell has a winding mandrel extending along the longitudinal axis, wherein the winding mandrel is thermally connected to the head of the round battery cell. In particular, the winding mandrel is thermally connected to the base region of the round battery cell, if necessary. In particular, heat can be effectively dissipated from the round battery cell via the winding mandrel, in particular to a cooling medium flowing through the first channel or the second channel.

[0031] In particular, the opening is closed by a membrane, wherein the membrane can be compressed and at least partially destroyed when the gas of the round battery cell is discharged into the first channel.

[0032] In particular, the battery device comprises at least a plurality of round battery cells, wherein the plurality of round battery cells are arranged adjacent to one another and each round battery cell extends with a round battery cell head through a corresponding opening into the first channel.

[0033] In particular, during operation of the battery device, the first channel and, if appropriate, the second channel are acted upon by a cooling medium (eg, a coolant). During operation of the battery device, heat can be dissipated from the housing or the temperature of the round battery cells can be adjusted via the cooling medium.

[0034] In particular, it is proposed that the first channel serves, on the one hand, to cool or temperature-control the at least one round battery cell and, on the other hand, to discharge components of the round battery cell that could escape from the round battery cell in the event of a crash.

[0035] Specifically, a combined cooling and degassing system for round battery cells is proposed. In this system, the closed cooling system, i.e., the first channel, is used to guide the generated hot gases in a targeted and closed manner toward the environment in the event of damage to one or more round battery cells, and ultimately to discharge them safely there. This involves, in particular, the functional integration of the two systems, which, in addition to safety benefits, also yields advantages in weight and installation space.

[0036] Another advantage is the possibility of cooling the round battery cells on both ends, i.e., in the base area via the second channel and in the head area via the first channel. Furthermore, the resulting possibility of eliminating the inner, curved heat-conducting plates allows continued and, if necessary, enhanced utilization of the compression of the round battery cells, provided the combined cooling and degassing system is suitably designed.

[0037] In particular, the second channel is a further first channel which is thermally connected on one side to the base region of at least one round battery cell and which has on the other side at least one opening for receiving at least one round battery cell head of a further round battery cell.

[0038] The round battery cell is designed in particular to have an outwardly shaped round battery cell head similar to a common household AA or AAA battery. This round battery cell head is inserted in a form-fitting manner into a coolant line structure provided with an opening (preferably a bore), i.e., a first channel, so that the battery cell body (the actual round battery cell) is located outside the first channel, while the round battery cell head projects into the first channel.

[0039] The remaining gap between the round battery cell and the first channel is closed in particular with a heat-conducting material, in particular a heat-conducting adhesive, which is to be provided at this location anyway for improved heat conduction.

[0040] Thus, the thermally conductive material, in a functionally integrated manner, fulfills both its naturally intended function of improving heat conduction and the required additional function of sealing the first channel relative to the circular battery cell. A third function integrated in this context is securing the position of the circular battery cell within the housing.

[0041] The first channel or cooling system has inlet or outlet channels (inlet or outlet) on both sides, in particular, through which cooling medium is supplied or discharged in the normal state and round cell components (e.g. gases) escaping from the round cell are discharged in the damaged state.

[0042] The round battery cell has a degassing opening at the round battery cell head (preferably at a predetermined weak point in the metal round battery cell housing). This degassing opening is normally closed and is opened only in the event of an incident to allow for the targeted discharge of generated hot gases and electrolyte residues. It is proposed that the gases and electrolyte residues of the round battery cell be discharged not into the housing but into a closed coolant line structure, i.e., the first channel, so that the gases and electrolyte residues of the round battery cell are directed and safely away from the damaged round battery cell to a safety outlet at another location in the battery device or the motor vehicle. This prevents damage to other round battery cells or other (electrical) components.

[0043] These outlets can be designed to be closed off from the environment by means of membranes or pressure relief valves, so that the contents of the circular battery cell can be discharged into the environment only in the event of degassing.

[0044] Since the round cell head protrudes into the first channel, the coolant flows permanently around it, resulting in the most efficient direct cooling in this area. Furthermore, heat management is advantageous if a winding mandrel is located within or in the center of the round cell and is directly thermally connected to it, thus allowing the round cell to be cooled from the inside.

[0045] In particular, the first channel is fluidically connected to at least one venting device, wherein if battery components escape from at least one round battery cell into the first channel and a limit pressure in the first channel is exceeded, excess pressure can be relieved via the at least one venting device. In particular, the venting device is arranged such that the excess pressure is relieved at a predeterminable area outside the housing.

[0046] In particular, the first channel is fluidically connected to a plurality of exhaust devices, wherein these exhaust devices can be switched in a controllable manner so that components escaping into the first channel can be specifically diverted toward at least one exhaust device. Damage to other round battery cells can thus be avoided by discharging components escaping from the round battery cells through the first channel, for example, along the shortest possible path out of the housing.

[0047] The opening (preferably a drilled hole) in the first channel can be closed, in particular, with an additional membrane. The membrane can be designed to be very thin because, in the normal state, the membrane is pressed against the directly adjacent round battery cell head by the internal pressure of the cooling system, i.e. the pressure of the cooling medium present in the first channel. This is advantageous insofar as the membrane or the damage to the membrane may have been designed for a smaller pressure difference and opens the opening quickly and relatively early, which is equivalent to or results in a rapid discharge of the components of the round battery cell (e.g. gas). In particular, the design of the membrane can only take into account the degassing requirements. In the event of degassing, i.e. in the event of damage to the round battery cell, the degassing opening of the round battery cell on the round battery cell head is opened, and due to the pressure difference generated on the membrane, the membrane deforms into the structurally free first channel until the membrane is finally destroyed and the opening is opened relative to the first channel. The advantage of this additional membrane is the additional sealing function of the cooling system relative to the round battery cell, i.e. a redundant sealing design in parallel with the thermally conductive adhesive.

[0048] Through the proposed battery device, the many advantages of round battery cells in the battery system can still be fully utilized, and at the same time their high load-bearing capacity can be additionally used. On the one hand, this improves the safety of the battery system and therefore also the safety of the vehicle equipped with such a battery system, and on the other hand, it also enables a more efficient battery system. In addition, in addition to injection molding, 3D printing can also be used as a manufacturing process. 3D printing can achieve additional degrees of freedom in the production of structures, such as the design of the first channel and, if necessary, the second channel and its openings, and can also be fast and cheap. The most important advantage is the (very) high speed and very high degree of automation of the process, which can be achieved through the development of structural details. Therefore, the manufacture of battery devices consisting of round battery cells can be achieved quickly and cheaply, and the individual cost advantages of round battery cells can therefore be maintained. Therefore, compared with soft-pack battery cell modules and modules with prismatic battery cells, the battery device is also price-competitive in its assembly.

[0049] Furthermore, a method for operating the described battery arrangement is proposed. The battery arrangement includes a controller, by which at least one exhaust device, preferably a plurality of exhaust devices, can be switched in a controlled manner. A first channel of the battery arrangement is fluidically connected to the plurality of exhaust devices, wherein the exhaust devices can be controlled and switched by the controller such that battery components escaping into the first channel can be directed in a targeted manner toward the at least one exhaust device.

[0050] Therefore, the battery device comprises, in particular, a control unit which is equipped, configured or programmed to carry out the described method, ie, to switch at least one venting device in a targeted manner.

[0051] Furthermore, the method can also be executed by a computer or by means of a processor of a control unit.

[0052] Therefore, a system for data processing is also proposed, which system comprises a processor adapted / configured to carry out the method.

[0053] A computer-readable storage medium may be provided, comprising instructions which, when executed by a computer / processor, enable the computer / processor to carry out the method.

[0054] The embodiments of the method can in particular be transferred to a battery device or a computer-implemented method (i.e. a computer or processor, a system for data processing, a computer-readable storage medium), and vice versa.

[0055] In particular, the use of the indefinite article ("a", "an") in the claims and the description describing the claims is to be understood as such and not as a numeral. Therefore, the terms or components introduced in this manner are to be understood as meaning that they occur at least once and, in particular, also multiple times.

[0056] It should be noted that the numerals used herein ("first," "second," etc.) serve primarily (only) to distinguish between multiple identical objects, dimensions, or processes, i.e., they do not, in particular, impose a mandatory requirement for the interdependence and / or order of these objects, dimensions, or processes. If a dependency and / or order is required, this will be explicitly stated or will be readily apparent to a person skilled in the art upon studying the specifically described design. If a component can appear multiple times ("at least one"), a description of one of these components may also apply to all or most of these components, but this is not mandatory. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention and the technical environment are described in more detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the exemplary embodiments listed. In particular, unless otherwise explicitly stated, it is also possible to extract details of the facts depicted in the drawings and combine them with other components and concepts in the description. It should be noted in particular that the drawings and, in particular, the dimensional ratios shown are merely schematic. In the drawings:

[0058] Figure 1 A cross-section of a battery device having vertical circular battery cells is shown in side view;

[0059] Figure 2 Show the basis Figure 1 Battery device in damaged condition;

[0060] Figure 3 A cross section of a battery device having horizontal round battery cells is shown in side view;

[0061] Figure 4 A cross section of a battery arrangement (e.g., with vertical round battery cells) is shown in top view; and

[0062] Figure 5 Show the basis Figure 4 of the battery unit in case of damage. DETAILED DESCRIPTION

[0063] Figure 1 The side view shows a section through a battery device 1 having vertical round battery cells 3 . Figure 2 Show the basis Figure 1 The battery device 1 in the case of damage. Figure 1 and Figure 2 .

[0064] The battery device 1 comprises a housing 2 and a round battery cell 3 arranged therein, the round battery cell extending from a base region 4 with a cylindrical battery cell body 5 along a longitudinal axis 6 to a head region 7 and having a round battery cell head 9 on the head region 7 protruding in the direction of the longitudinal axis 6 relative to the head region end face 8, the battery device further comprising a first channel 10 extending from an inlet 11 through the housing 2 to an outlet 12. The first channel 10 has an opening 13 through which the round battery cell head 9 extends into the first channel 10, so that in the event of damage (see Figure 2 ) The gas of at least one circular battery cell 3 is discharged into the first channel 10 through the circular battery cell head 9.

[0065] The round battery cell 3 extends from a base region 4 along a longitudinal axis 6 with a cylindrical cell body 5 to a head region 7. The head region 7 has a round cell head 9 that protrudes in the direction of the longitudinal axis 6 relative to the head region end face 8. The cell body 5 is composed of multiple layers of electrode sheets (anode and cathode) and separators. These layers and separators are initially arranged in a stacked arrangement and then wound around each other around the longitudinal axis 6 to form the cylindrical cell body 5. The cell body 5 has a constant cross-section or cross-sectional area along the longitudinal axis 6, so that the base region end face in the base region 4 and the head region end face 8 have the same dimensions.

[0066] The round battery cell 3 has a round cell head 9 in the head region 7. This round cell head has a smaller cross section transversely to the longitudinal axis 6 than the cell body 5 or the head region end face 8. The round cell head 9 is arranged essentially concentrically with respect to the head region end face 8 or the cell body 5 or the longitudinal axis 6.

[0067] In the event of damage or a collision, components 20 of the round cell 3 , such as gases and / or electrolyte residues, are discharged from the round cell 3 through the round cell head 9 .

[0068] A first channel 10 is also arranged in the housing 2. The first channel has an opening 13 for each round battery cell 3 arranged thereon, through which the corresponding round battery cell head 9 extends into the first channel 10. The contents 20 of the round battery cells 3 can be discharged into the first channel 10 via the corresponding round battery cell head 9, so that these contents do not escape into the housing 2 and damage other round battery cells 3 located therein.

[0069] The round battery cells 3 are arranged vertically in the battery arrangement 1 and are therefore arranged relative to the surroundings and relative to the direction of gravity during operation of the battery arrangement 1 .

[0070] A heat-conducting material 14 is arranged between the head region end face 8 and the first channel 10 . The heat-conducting material 14 enables particularly good heat dissipation from the round battery cells 3 to the first channel 10 or to a coolant 18 flowing through the first channel 10 .

[0071] The opening 13 is sealed, for example, fluid-tight or gas-tight, relative to the housing 2 by the heat-conducting material 14. That is, the heat-conducting material 14 separates the volume arranged in the first channel 10 from the volume arranged in the housing 2 but outside the first channel 10 and the corresponding round battery cell 3.

[0072] The base region 4 of the round battery cell 3 is connected to the second channel 15 in a heat-conducting manner.

[0073] The round battery cell 3 has a winding mandrel 16 extending along the longitudinal axis 6, wherein the winding mandrel 16 is connected to the round battery cell head 9 in a heat-conducting manner. The winding mandrel 16 is also connected to the base region 4 of the round battery cell 3, so that heat can be effectively dissipated from the round battery cell 3 via the winding mandrel 16 to the cooling medium 18 flowing through the first channel 10 or the second channel 15.

[0074] The opening 13 is closed by a membrane 17 , wherein the membrane 17 can be compressed and at least partially destroyed when the gas of the round battery cell 3 is discharged into the first channel 10 .

[0075] During operation of the battery device 1 , the first channel 10 and the second channel 15 are acted upon by a cooling medium 18 (eg, a coolant). During operation of the battery device 1 , the cooling medium 18 can dissipate heat from the housing 2 or control the temperature of the round battery cells 3 .

[0076] The first channel 10 serves, on the one hand, to cool or temperature-control the round battery cell 3 and, on the other hand, to discharge components 20 of the round battery cell 3 that could escape from the round battery cell 3 in the event of a collision.

[0077] In this combined cooling and degassing system for circular battery cells 3, a closed cooling system, i.e., a first channel 10, is used to direct the hot gases or components 20 generated by the circular battery cells 3 in a directed and closed manner toward the environment 22 in the event of damage to one or more circular battery cells 3 and ultimately to discharge them safely into the environment.

[0078] The first channel 10 or cooling system has an inlet 11 and an outlet 12 on both sides of the housing 2. In the normal state, a cooling medium 18 is supplied or discharged through the inlet and outlet, and in the case of a damage state, components 20 escaping from the round battery cells 3 are discharged.

[0079] The first channel 10 is fluidically connected to a venting device 19, wherein, if components 20 of the round battery cells 3 escape from at least one round battery cell 3 into the first channel 10 and a limit pressure 21 in the first channel 10 is exceeded, the excess pressure can be released into the environment 22 via the venting device 19. The venting device 19 is arranged such that the excess pressure is released over a predeterminable area outside the housing 2.

[0080] In this case, the first channel 10 is fluidically connected to a plurality of exhaust devices 19, wherein these exhaust devices can be switched controllably by a controller 23 so that components 20 of the round battery cells 3 escaping into the first channel 10 can be directed in a targeted manner toward at least one exhaust device 19. Thus, damage to other round battery cells 3 can be avoided by discharging components 20 escaping from the round battery cells 3 through the first channel 10, for example, along the shortest possible path out of the housing 2.

[0081] Figure 3 The side view shows a cross section of a battery device 1 with horizontal round battery cells 3. Figure 1 and Figure 2 Description.

[0082] Here, a plurality of round battery cells 3 are arranged one on top of the other. These round battery cells 3 extend with their head region end faces 8 into a first channel 10. Further stacks of round battery cells 3 are arranged within the housing 2. The stacks arranged adjacent to one another are arranged so that the round battery cells 3 of one stack are arranged with their head regions 7 adjacent to a first channel 10, while the round battery cells 3 of the other stack are arranged with their base regions 4 adjacent to the same channel, now referred to as a second channel 15. The individual first channels 10 are fluidically connected to a common inlet 11 and a common outlet 12.

[0083] Figure 4 The top view shows a section through a battery device 1 having vertical round battery cells 3 . Figure 5 Show the basis Figure 4 The battery device 1 in the case of damage. Figure 4 and Figure 5 . Figures 1 to 3 Description.

[0084] and Figure 1 and Figure 2 In contrast, here a plurality of first round battery cells 3 are arranged vertically adjacent to each other.

[0085] A first channel 10 is arranged in the housing 2. The first channel has an opening 13 for each round battery cell 3 arranged thereon, through which the corresponding round battery cell head 9 extends into the first channel 10. The contents 20 of the round battery cells 3 can be discharged into the first channel 10 via the corresponding round battery cell head 9, so that these contents do not escape into the housing 2 and damage other round battery cells 3 located therein.

[0086] The opening 13 of the round battery cell 3 is closed by a membrane 17 , wherein the membrane 17 can be compressed and at least partially destroyed when the gas of the round battery cell 3 is discharged into the first channel 10 .

[0087] Reference Signs List

[0088] 1 Battery device

[0089] 2 Housing

[0090] 3 round battery cells

[0091] 4 Base area

[0092] 5 Battery cell body

[0093] 6 Vertical axis

[0094] 7 Head area

[0095] 8 End face of head area

[0096] 9 round battery cell heads

[0097] 10 First Channel

[0098] 11 Entrance

[0099] 12 Exit

[0100] 13 Opening

[0101] 14 Thermal Conductive Materials

[0102] 15 Second Channel

[0103] 16 Winding mandrel

[0104] 17 membrane

[0105] 18 Cooling medium

[0106] 19 Exhaust system

[0107] 20 ingredients

[0108] 21 Ultimate pressure

[0109] 22 Environment

[0110] 23 Controller

Claims

1. A battery device (1), comprising at least: The housing (2) and the At least one round battery cell (3) which extends from a base region (4) with a cylindrical battery cell body (5) along a longitudinal axis (6) to a head region (7) and has a round battery cell head (9) on the head region (7) which protrudes in the direction of the longitudinal axis (6) relative to the head region end face (8), and a first channel (10) extending from an inlet (11) through the housing (2) to an outlet (12), and wherein during operation of the battery device (1), the first channel (10) is acted upon by a cooling medium (18) in order to control the temperature of the round battery cells (3); wherein the first channel (10) has at least one opening (13) through which the circular battery cell head (9) extends into the first channel (10); so that the circular battery cell head is circulated by the cooling medium and so that gas from the at least one circular battery cell (3) is discharged into the first channel (10) through the circular battery cell head (9); wherein a heat-conducting material (14) is arranged between the head region end face (8) and the first channel (10); wherein the opening (13) is sealed relative to the housing (2) by the heat-conducting material (14) so as to separate the volume arranged in the first channel from the volume arranged in the housing but outside the first channel and the corresponding circular battery cell; The base region (4) is thermally connected to a second channel (15), which is a further first channel for a further round battery cell, which is arranged overlapping the at least one round battery cell (3) in the direction of the longitudinal axis (6).

2. The battery device (1) according to claim 1, wherein: The round battery cell (3) has a winding mandrel (16) extending along the longitudinal axis (6), wherein the winding mandrel (16) is connected to the round battery cell head (9) in a heat-conducting manner.

3. The battery device (1) according to claim 1, wherein: The opening (13) is closed by a membrane (17), wherein the membrane (17) can be squeezed and at least partially destroyed when the gas of the circular battery cell (3) is discharged into the first channel (10).

4. The battery device (1) according to claim 1, comprising at least a plurality of circular battery cells (3), wherein: The plurality of circular battery cells (3) are arranged adjacent to each other and each circular battery cell (3) extends with a circular battery cell head (9) through a corresponding opening (13) into the first channel (10).

5. The battery device (1) according to claim 1, wherein: The first channel (10) is fluidically connected to at least one venting device (19), wherein, if a component (20) of a circular battery cell (3) escapes from the at least one circular battery cell (3) into the first channel (10) and a limit pressure (21) in the first channel (10) is exceeded, the excess pressure can be relieved via the at least one venting device (19).

6. The battery device (1) according to claim 5, wherein: The channel is fluidically connected to a plurality of exhaust devices (19), wherein at least some of the exhaust devices (19) can be switched controllably so that battery components (20) escaping into the first channel (10) can be directed in a targeted manner around at least one exhaust device (19).

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