Battery cell for a battery of a vehicle

Abstract

The invention relates to a battery cell (1), in particular for a drive battery of a vehicle. The battery cell (3) comprises an electrode stack (2) and a housing (11) having an inner housing part (4) and an outer housing part (3) which at least partially surrounds the inner housing part (4). The electrode stack (2) is arranged in the inner housing part (4), the inner housing part (4) has at least one passive cooling element (5), and the outer housing part (3) can be deformed at least along a height direction of the electrode stack (2) and is correspondingly designed to be at least partially movable relative to the inner housing part (4). A connecting part (6) is provided via which the inner housing part (4) and the outer housing part (3) are connected to one another and are thereby in contact in such a way that thermal energy can be transferred from the inner housing part (4) to the outer housing part. The outer housing part (3) can be designed in particular as a bellows. The battery cell (1) is in particular a solid-state battery cell.

Description

[0001] BATTERY CELL FOR A VEHICLE BATTERY

[0002] The present invention relates to the field of batteries for electric vehicles. In particular, the invention is directed to a battery cell for a drive battery of a vehicle, in particular an electric vehicle, and to a vehicle having a drive battery with at least one such battery cell.

[0003] A key focus in the development of electric or hybrid vehicles, i.e., vehicles that are at least partially powered by electric motors, is the battery that powers the electric motor (hence also called "drive battery" or "traction battery"). Various battery cells have been developed for this purpose, for example, lithium-ion cells. Several battery cells are typically arranged as a "battery pack" and, through appropriate wiring, form a "battery module" or simply a "battery." It is understood that the term "battery" hereinafter refers in particular to a rechargeable battery ("accumulator" or "battery").

[0004] In addition to battery cells with a liquid electrolyte, such as conventional lithium-ion batteries, there are also solid-state batteries (solid-state batteries or all-solid-state batteries - ASSB), in which the electrodes and electrolyte are made of solid material. In particular, lithium-silicon batteries are increasingly being developed, which use a silicon-based anode and lithium ions as charge carriers. However, in batteries with a high silicon content, and especially in solid-state batteries, the thickness of the electrode layers depends on the state of charge. In the discharged state, all-solid-state batteries initially have no anode on the anode side, but merely a current collector (e.g., a copper foil).When charged, an anode is formed in the form of pure lithium, which migrates from the cathode (lithium is stored in the cathode) through a separator during the charging process and deposits or forms on the copper foil. To activate the cell, the electrode layers must be pressed together. The necessary forces are in the kN range (or the corresponding pressures in the tens of bar range).

[0005] For a solid-state battery to function properly, the forces or pressures used to press or hold the electrode layers of a cell together must be within certain threshold values. At the same time, it must be taken into account that the height of the electrode stack changes depending on the state of charge, as explained above. If the forces (pressures) within the cell were designed for the (fully) charged state, then they would be too low in all intermediate states (i.e., between "full" and "empty"), and the cell would no longer function. Conversely, if the forces (pressures) were designed for the discharged state, then they would be too high in all intermediate states, and the cell would burst.

[0006] Constant compression of the layers can be achieved hydraulically (or pneumatically). However, this would be complex, as the cells would have to be supplied with a pressure unit, either individually or as modules. This would require additional space, and the hydraulic system would have to be constantly supplied with power to maintain constant forces, even during extended storage periods. However, hydraulic systems can leak, and the corresponding lines also require space. Furthermore, the hydraulic components and hydraulic oil add weight.

[0007] To compensate for height differences during charging or discharging of a solid-state battery cell, the outer geometry of a cell can be designed as a corrugated tube or bellows. A cylindrical cell shell with the electrode layers can be arranged within this. However, cooling is difficult because the heat from the inner cell shell cannot simply be dissipated via the corrugated outer shell surface. This is particularly due to the insufficient contact between the corrugated tube and the cylinder, as movement must be guaranteed to compensate for height differences. Heat cannot be dissipated to a cooler via the corrugated outer surface. A thermal bond would shear away during movement due to the change in height. A cooling fluid could flow through the gap, but this type of active cooling is only useful for high-performance applications.

[0008] In vehicles that do not have particular requirements for rapid charging or high power demands, there is no need for such high-performance cooling. This eliminates the need for complex cooling circuits, which saves costs, weight, and complexity, and increases reliability because fewer components can be damaged. However, with simple passive cooling, the problem described above of dissipating heat from the electrode stack or the cylindrical cell casing via the corrugated outer surface still exists. It is an object of the present invention to provide a battery cell for a solid-state battery in which the electrode layers are held or pressed together appropriately in every state of charge, while simultaneously providing sufficient cooling.

[0009] This object is achieved according to the teaching of the independent claims. Various embodiments and further developments of the invention are the subject of the dependent claims.

[0010] A first aspect of the invention relates to a battery cell, in particular for a drive battery of a vehicle, in particular an electric vehicle. The battery cell has an electrode stack and a housing with an inner housing part and an outer housing part that at least partially surrounds the inner housing part. The electrode stack is arranged in the inner housing part, the inner housing part has at least one passive cooling element, and the outer housing part is deformable at least along a height direction of the electrode stack and correspondingly designed to be at least partially displaceable with respect to the inner housing part. A connecting part is provided, via which the inner housing part and the outer housing part are connected to one another and are thereby in contact such that thermal energy can be transferred from the inner housing part to the outer housing part.

[0011] The invention is therefore based on the housing of the battery cell having two parts, an inner housing part and an outer housing part. The electrode stack of the battery cell, which is in particular a solid-state battery cell, is arranged in the inner housing part, wherein heat generated during operation can be dissipated via at least one cooling element which is located in the inner housing part, i.e. in particular adjacent to the electrode stack. The cooling element is a passive cooling element, i.e. no cooling fluid is passed through the battery cell, but cooling takes place, for example, by condensing a fluid in the passive cooling element, which is closed per se. While the inner housing part can be designed to be essentially dimensionally stable, the outer housing part is deformable and displaceable relative to the inner housing part, in particular in a height direction of the electrode stack.This means that it can adapt to changes in the layer thickness of the electrode stack depending on the state of charge and at the same time keep it pressed together. In order to be able to dissipate the heat from the inner housing part, a connecting part is provided which connects the inner and outer housing parts to one another. This creates a heat sink, particularly in a stationary part of the housing, so that the heat can be dissipated from the inner housing part or the cooling element therein to the outer housing part and thus to the environment. It is therefore possible to provide a battery cell which, on the one hand, holds the electrode stack together with a suitable force in every state of charge because it adapts to changes in layer thickness thanks to the deformable outer housing part, and which, on the other hand, can be cooled (passively) with little effort. This means thatNo additional piping or cooling systems are required, saving effort, space, weight, and costs. For applications that aren't in the high-performance range, this type of cooling is perfectly sufficient.

[0012] Thanks to passive cooling, which is integrated directly into the battery cell, each battery cell that can be combined in battery modules for the traction battery can have its own passive cooling system. Passive cooling means that no additional controllable and / or movable elements that are supplied with energy for cooling, such as a fan and / or an active cooling circuit, are required. Instead, a heat pipe, for example made of copper and / or stainless steel, can be provided as a passive cooling element. This heat pipe provides an encapsulated volume with a working medium, for example water, ammonia, or methanol. This heat absorbs heat by evaporating the working medium due to enthalpy of vaporization, distributes it in the heat pipe, and condenses the working medium at cooler locations so that the heat can be released into the environment due to enthalpy of condensation.

[0013] The term "vehicle" used here refers in particular to a passenger car, including all types of motor vehicles, hybrid and battery-powered electric vehicles, as well as vehicles such as sedans, vans, buses, trucks, delivery vans, and the like. The term "electric vehicle" then refers in particular to electric or hybrid vehicles, in particular vehicles that are at least partially powered by an electric motor. An electric vehicle can in particular be a passenger car, but also a vehicle such as a van, bus, truck, delivery van, and the like, or a two-wheeler such as an (electric) motorcycle, (electric) scooter, e-bike, e-scooter, and the like. The battery module can in particular be a battery or part of a battery, in particular the drive battery of an electric vehicle. The terms "comprises," "includes," "includes," "has" 1, "has," "with," or any other variation thereof is intended to cover non-exclusive inclusion. For example, a method or apparatus that includes or has a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or that are inherent in such method or apparatus.

[0014] Furthermore, unless explicitly stated to the contrary, "or" refers to an inclusive "or" and not an exclusive "or." For example, a condition A or B is satisfied by one of the following conditions: A is true (or present) and B is false (or absent), A is false (or absent) and B is true (or present), and both A and B are true (or present).

[0015] The terms "a" or "an" as used herein are defined as "one or more." The terms "another" and "another," and any other variations thereof, are defined as "at least one other."

[0016] The term “plurality” as used here shall mean “two or more”.

[0017] The term “configured” or “set up” to fulfil a specific function (and respective modifications thereof) is to be understood within the meaning of the invention that the corresponding device is already in a design or setting in which it can carry out the function or is at least adjustable - i.e. configurable - so that it can carry out the function after being set accordingly. The configuration can be carried out, for example, by appropriately setting parameters of a process sequence or of switches or the like for activating or deactivating functionalities or settings. In particular, the device can have a plurality of predetermined configurations or operating modes, so that the configuration can be carried out by selecting one of these configurations or operating modes.

[0018] Preferred embodiments of the battery cell according to the first aspect are described below, each of which can be combined with one another as desired, unless this is expressly excluded or technically impossible. In some embodiments, the inner housing part is cylindrical, wherein the connecting part extends from a front end of the inner housing part. In particular, the electrode stack is arranged in the inner housing part such that the height direction of the electrode stack corresponds to the longitudinal direction of the cylindrical housing part. The at least one passive cooling element can then be arranged in particular in or on the outer surface, i.e. the wall of the inner housing part, as will be described in more detail below.Since the outer housing part moves along the vertical direction of the electrode stack depending on the charge state, it is advantageous to provide the connecting part at a front end that remains essentially stationary during operation. Other shapes are also conceivable for the inner housing part, which do not have a circular cross-section, but rather a polygonal cross-section, for example, square, pentagonal, or hexagonal, i.e., in particular, prismatic or cuboidal, whereby the above statements regarding the front sides, lateral surface, and vertical direction apply accordingly. It is understood that the outer housing part has a shape that matches the inner housing part.

[0019] In some embodiments, the connecting part forms an end face of the inner housing part and at least partially abuts an end face of the outer housing part from the inside. In particular, the connecting part, as an end face, can form a closure or “cover” of the inner housing part. The connecting part can thus abut an end face of the outer housing part from the inside, so that a sufficiently large surface area can be provided for heat transfer. Alternatively or additionally, the connecting part can also be designed such that it abuts (in an end region of the battery cell) against a lateral surface of the outer housing part (from the inside). In this way, additional surface area can be provided for heat transfer if necessary. However, the connecting part does not have to completely close the inner housing part at the end face. For example, an opening can be provided there to provide a terminal connection for the battery cell.

[0020] In some embodiments, the connecting part is configured to extend circumferentially around the inner housing part. While it may in principle be sufficient to provide, for example, one or more webs as a connecting part, it is advantageous if the connecting part extends circumferentially around the inner housing part. In this way, the greatest possible contact is achieved between the inner housing part and the connecting part, and furthermore, correspondingly, also with the outer housing part. In particular, the connecting part can then form an end face of the inner housing part, as just explained.

[0021] In some embodiments, the connecting part is integral, i.e., formed in one piece with the inner housing part. This integral design achieves optimal heat transfer from the inner housing part or the at least one cooling element to the connecting part. The connecting part can thus form an "extension" of the inner housing part, in particular as an end face as described above. It is understood that, alternatively, the connecting part can also be formed as a separate part, which can be connected to the inner housing part, for example, glued or welded.

[0022] In some embodiments, the connecting part is welded to the outer housing part. A welded connection improves heat transfer from the connecting part to the outer part. It is understood that the connecting part can also be connected to the outer housing part in other ways, for example, by gluing, in particular using a thermally conductive adhesive.

[0023] In some embodiments, the inner housing part has a movable base plate which is firmly connected to the outer housing part. The base plate can act on the electrode stack in such a way that forces (or pressures) are transferred from the outer housing part to the electrode stack in order to compress it. In particular, if the inner housing part is cylindrical (or prismatic), it can be designed as a tube open towards one end, wherein the movable base plate (or a part thereof) is received in the open end and then moves with the electrode stack, in particular when the layer thickness of the electrode stack changes. The connecting part can then be arranged at the opposite end. The two housing parts are thus firmly connected by means of the connecting part, while at the opposite end there is space for the outer housing part to move relative to the inner housing part.

[0024] In some embodiments, the outer housing part is hermetically sealed. This means, in particular, that there are no connections, such as passages for a cooling fluid or the like. In addition to a lateral surface (which allows deformation and movement), an end face, in the region of which (from the inside) the connecting part is arranged, the outer housing part can have, for example, a base plate on the other end face. This can then be connected to the movable base plate of the inner housing part just described. It is understood that the hermetic closure of the outer housing part thus hermetically seals the entire battery cell.

[0025] In some embodiments, the outer housing part is designed as a bellows. A bellows, which can also be referred to as a corrugated tube, allows, in particular, a height change depending on the height of the electrode stack (which, as explained, changes depending on the state of charge). Furthermore, the bellows can seal the battery cell despite the variable height, in particular, a hermetic seal as described above. Furthermore, the bellows functions as a compression element, compressing the electrode stack accordingly at all times using a spring force.

[0026] The bellows can have essentially parallel corrugations. This also increases the surface area of ​​the housing, which can lead to better heat transfer between the connections. Alternatively, the bellows can have essentially spiral corrugations. The corrugations, for example, form one or more spirals along the housing shell in the longitudinal direction.

[0027] In some embodiments, the passive cooling element is connected to an outer surface, in particular the lateral surface of the inner housing part, or is integrated into a wall of the inner housing part. The cooling element can, as will be explained in more detail below, be designed as a heat pipe or specifically as a chamber (vapor chamber). The battery cell can have a plurality of passive cooling elements, each designed as a heat pipe, and arranged circumferentially around the battery cell. Alternatively, the battery cell can have exactly one cooling element that completely encloses the battery cell laterally. In particular, heat pipes can be designed as very flat structures, such as planar vapor chambers with a small wall thickness, so that the volume of the battery cell is only slightly increased.The heat pipe can be arranged in a region of the outer wall of the inner housing part of the battery cell, so that the heat generated (by the electrode stack in the inner housing part) can be absorbed and dissipated via the connecting part to the outer housing part and thus to the environment. The passive cooling element can be connected to an outer surface of the outer wall of the inner housing part, for example by plugging, welding, screwing, gluing, or crimping. The passive cooling element can also be integrated into the outer wall of the inner housing part. This means that chambers designed as heat pipes can be provided within the wall. For example, the outer wall can also be provided by an extruded aluminum profile, wherein corresponding cooling elements (heat pipes) can be arranged in undercuts of the profile.

[0028] As mentioned, the battery cell can have a plurality of passive cooling elements, each of which can be designed as a heat pipe and can be distributed around the circumference. In other words, a circumferential structure of passive cooling elements, each of which is designed as a heat pipe, can be provided around a surface, in particular a lateral surface of the inner housing part. Thus, the passive cooling elements form a plurality of chambers that can absorb, distribute, and release heat from each side of the battery cell. The respective chambers can be directly adjacent to one another or arranged with respective gaps between them in order to save material and / or costs.

[0029] Alternatively, the battery cell can also have a single cooling element that completely surrounds the battery cell, or more precisely, the inner housing part, from the sides. This means that the passive cooling element can cover the outer surface or be integrated into it, with only one chamber of the heat pipe being provided, which surrounds the battery cell towards the sides. In other words, the wall of the inner housing part can be double-walled to provide the passive cooling element through the gap.

[0030] The at least one passive cooling element can, as already briefly mentioned, be designed as a flat vapor chamber. A vapor chamber is a special embodiment of a heat pipe, which is designed in particular for uniform temperature control of surfaces. The advantage of vapor chambers is that they require less space than conventional heat pipes and are therefore suitable for cramped and limited areas. A support structure can preferably be provided within the vapor chamber so that the vapor chamber is not compressed even under load. A second aspect of the invention relates to a vehicle, in particular an electric vehicle, which has a drive battery with at least one battery cell according to the first aspect of the invention.

[0031] The features and advantages explained with respect to the first aspect of the invention also apply accordingly to the further aspects of the invention.

[0032] Further advantages, features and possible applications of the present invention will become apparent from the following detailed description in conjunction with the drawings.

[0033] It shows:

[0034] Fig. 1 shows a battery cell in a sectional view in the discharged state;

[0035] Fig. 2 shows the battery cell from Fig. 1 in the charged state;

[0036] Fig. 3 the housing of the battery cell in a sectional view;

[0037] Fig. 4a the outer housing part of the battery cell in a perspective view;

[0038] Fig. 4b shows an alternative embodiment of the outer housing part;

[0039] Fig. 5 is an exploded view of the battery cell;

[0040] Fig. 6 is a detailed view of Fig. 2;

[0041] Fig. 7 is a detailed view of Fig. 3; and

[0042] Fig. 8a to Fig. 8d sectional views through the inner housing part with cooling elements according to various embodiments.

[0043] Throughout the figures, the same reference numerals are used for the same or corresponding elements of the invention.

[0044] Fig. 1 shows a battery cell 1 in a sectional view. The battery cell 1 can in particular be part of a drive battery of an electric vehicle (not shown). In the structure of such a drive battery, several battery cells 1 are usually connected to form a battery module (not shown) in order to achieve a desired voltage. The battery cell 1 is a solid-state battery cell. This means that both the electrodes and the electrolyte are solid (a gel-like electrolyte is also conceivable). In contrast, battery cells with a liquid electrolyte, for example, are known in which the electrodes can be arranged in a rolled-up manner. In the battery cell 1 shown, however, the electrodes are in the form of an electrode stack 2.

[0045] The electrode stack 2 comprises layers arranged one above the other, namely a cathode layer, an anode layer, and a separator layer arranged between the cathode layer and the anode layer. The electrode stack 2 is formed by a plurality of these layer sequences. Furthermore, additional layers can be provided, such as insulators and metallic conductor foils. The electrode stack is arranged in an inner housing part 4, which is surrounded by an outer housing part 3. The cathode layers and the anode layers are electrically contacted with the inner housing part 4 and the outer housing part 3, respectively, to form a positive pole and a negative pole of the battery cell 1, respectively. This is indicated in Fig. 1 by (+) and (-).

[0046] The illustrated embodiment is a lithium battery with a high silicon content. The cathode layers have essentially the same layer thickness in the charged, partially discharged, and discharged states. In contrast, the layer thickness of the anode layers changes depending on the state of charge. In the discharged state, which is shown in Fig. 1, no anode layer is formed. Lithium is stored in the cathode layers. The lithium migrates from the anode layers through the separator layers into the cathode layers and is stored there. In the charged state, which is shown in Fig. 2, anode layers have been deposited. These are formed by the charging process, with lithium collecting on conductor foils (e.g., copper foils). The electrode stack 2 grows in height by the thickness of one anode layer x the number of layers.

[0047] For proper functionality of the battery cell 1, the electrode stack 2 must be pressed together in all charge states. This is achieved by means of the outer housing part 3, which is designed as a bellows and thus exerts a compressive spring force on the electrode stack 2. For this purpose, the outer housing part 3 is designed to be displaceable relative to the inner housing part 4, with the pressure on the electrode stack 2 being transmitted via a base plate 7, which is displaceable in the inner housing part 4 but firmly connected to the outer housing part 3, e.g., welded at the edges. The housing 11 with the outer housing part 3, the inner housing part 4, and the base plate 7 just described is shown in particular in Fig. 3. The base plate 7 consists of two disks connected by a connecting piece.This can be designed in such a way that it breaks when a predetermined internal pressure is exceeded in order to prevent the battery cell 1 from bursting.

[0048] Different embodiments of the outer housing part 3, 3' are shown in Fig. 4a and Fig. 4b, which differ only in the shape of the pleat waves, which can be parallel (Fig. 4a) or spiral (Fig. 4b).

[0049] Fig. 5 shows an exploded view of all components of the battery cell 1, which can also be seen in Fig. 1 and Fig. 2. The inner housing part 4, which in the example shown is essentially cylindrical, is arranged in the outer housing part 3, the bellows. The electrode stack 2 is arranged therein. A terminal connection 9 is provided above the electrode stack 2, which here forms the positive pole and is electrically insulated from the outer housing part 3, which forms the negative pole, by an insulation 8. A pressure plate 10 is arranged at the upper end of the electrode stack 2, which pressure plate absorbs the pressing force on the electrode stack 2. The special profile shape allows the absorption of forces in the double-digit kN range. Finally, the base plate 7 described above is arranged at the lower end of the battery cell 1.The outer housing part 3 and thus the battery cell 1 are hermetically sealed when assembled.

[0050] Cooling of the hermetically sealed battery cell 1 is achieved via passive cooling elements 5. These cooling elements 5, which are integrated into or attached to the inner housing part 4, can be designed in particular as heat pipes. The exterior of the cooling elements 5 can be made of copper or aluminum. The interior has a so-called wick structure, which, through capillary action, can transport condensed cooling medium, such as water or ammonia, in the cooling elements 5 to the warmer areas, thus creating an internal circuit.

[0051] The heat is dissipated from the inner housing part 4 or the cooling elements 5 via a connecting part 6. This extends from one end of the inner housing part 4 and is connected, for example welded, to the inner side of the outer housing part 3. The connecting part 6 can be seen in particular in the detailed views in Fig. 6 and Fig. 7. The connecting part 6 is formed integrally with the inner housing part 4 and forms a circumferential end-face closure, as can be seen in particular in Fig. 5. In this way, a sufficiently large contact surface on the outer housing part 3 is created in order to thereby form a heat sink. It is understood that the connecting part 6 can also have a different shape and, for example, can alternatively or additionally also bear against the inner side of the lateral surface of the outer housing part 3.

[0052] While the heat generated can be dissipated by the fixed connection of the outer housing part 3 and the inner housing part 4 via the connecting part 6 at one end of the battery cell 1, the base plate 7 at the other end of the battery cell 1 allows the necessary change in height of the electrode stack 2, which is pressed together by the outer housing part 3 with the appropriate force in any state and at any time due to the spring action of the bellows.

[0053] Fig. 8a to Fig. 8d show sectional views through the housing 11 perpendicular to the longitudinal axis (height direction) of the battery cell 1 with various embodiments of the passive cooling elements 5, which all function according to the evaporation principle described above. In the example shown in Fig. 8a, only one passive cooling element 5 is provided, which is formed circumferentially in the wall of the inner housing part 4, i.e. the cooling element 5 is formed by the double-walled housing part 4. In the example shown in Fig. 8b, several passive cooling elements 5' are arranged in the housing part 4', wherein they are embedded in the wall. The wall can act as a support and, for example, be formed as an extruded profile with undercuts in which the cooling elements 5' are received. In contrast, the cooling elements 5" in the example shown in Fig. 8c are attached to the outside of the housing part 4".For example, the cooling elements 5" can be welded externally to the housing part 4". In the example shown in Fig. 8d, the cooling elements 5'" are designed as vapor chambers, which have a larger surface area compared to narrower heat pipes. The cooling elements 5'" are integrated into the wall of the housing part 4'" but protrude radially outwards. While at least one exemplary embodiment has been described above, it should be noted that a large number of variations exist. It should also be noted that the described exemplary embodiments represent only non-limiting examples and are not intended to limit the scope, applicability, or configuration of the devices and methods described herein.Rather, the foregoing description will provide one skilled in the art with guidance for implementing at least one exemplary embodiment, it being understood that various changes may be made in the operation and arrangement of the elements described in an exemplary embodiment without departing from the subject matter as defined in the appended claims, as well as their legal equivalents.

[0054] LIST OF REFERENCE SYMBOLS

[0055] 1 battery cell

[0056] 2 electrode stacks

[0057] 3 outer housing part 4 inner housing part

[0058] 5 Cooling element

[0059] 6 Connecting part

[0060] 7 Base plate

[0061] 8 Insulation 9 Terminal connection

[0062] 10 printing plate

[0063] 11 housings

Claims

CLAIMS 1. A battery cell (1), in particular for a drive battery of a vehicle, comprising an electrode stack (2) and a housing (11) with an inner housing part (4) and an outer housing part (3) at least partially surrounding the inner housing part (4), wherein the electrode stack (2) is arranged in the inner housing part (4), the inner housing part (4) has at least one passive cooling element (5), and the outer housing part (3) is designed to be deformable at least along a height direction of the electrode stack (2) and correspondingly at least partially displaceable with respect to the inner housing part (4), wherein a connecting part (6) is provided, via which the inner housing part (4) and the outer housing part (3) are connected to one another and are thereby in contact such that thermal energy can be transferred from the inner housing part (4) to the outer housing part.

2. Battery cell according to claim 1, wherein the inner housing part (4) is cylindrical or prismatic, wherein the connecting part (6) extends from a front end of the inner housing part (4).

3. Battery cell according to claim 1 or 2, wherein the connecting part (6) forms an end face of the inner housing part (4) and at least partially abuts an end face of the outer housing part (3) from the inside.

4. Battery cell according to one of the preceding claims, wherein the connecting part (6) is formed circumferentially in a circumferential direction of the inner housing part (4).

5. Battery cell according to one of the preceding claims, wherein the Connecting part (6) is formed integrally with the inner housing part (4).

6. Battery cell according to one of the preceding claims, wherein the Connecting part (6) is welded or glued to the outer housing part (3).

7. Battery cell according to one of the preceding claims, wherein the inner housing part (4) has a movable base plate (7) which is firmly connected to the outer housing part (3).

8. Battery cell according to one of the preceding claims, wherein the outer housing part (3) is hermetically sealed.

9. Battery cell according to one of the preceding claims, wherein the outer housing part (3) is designed as a bellows.

10. Battery cell according to one of the preceding claims, wherein the passive Cooling element (5) is connected to an outer surface of the inner housing part (4) or integrated into a wall of the inner housing part (4).

11. Battery cell according to one of the preceding claims, wherein the battery cell (1) is a solid-state battery cell.

12. Vehicle comprising a drive battery with at least one battery cell (1) according to one of the preceding claims.

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