DE102021114887A1 - Battery cell with cover element - Google Patents

Abstract

Battery cell (1), at least comprising a housing (2) and at least one block (3) of active material arranged therein, the block (3) of active material having a plurality of electrodes (4) comprising at least one anode, at least one cathode and between the different electrodes (4) has a separator; wherein the housing (2) has a casing part (5) with at least one open end face (6, 7); wherein the end face (6, 7) is at least partially closed by a cover element (8); wherein the cover element (8) is designed in multiple layers; wherein a first layer (9) facing the block (3) of active material and a second layer (11) facing the environment (10) of the battery cell (1) are each made of an electrically conductive material, with the first layer (9 ) and the second layer (11), a third layer (12) is arranged, via which the cover element (8) is connected to the casing part (5).

Description

The invention relates to a battery cell, at least comprising a housing and at least one block of active material arranged therein, the block of active material having a plurality of electrodes comprising at least one anode, at least one cathode and a separator between the different electrodes. The block of active material comprises in particular a stack or a coil (e.g. flat coil, round coil, Z-fold) made up of at least two electrodes and the separator.

In particular, each block of active material has several anodes and cathodes and a separator between the different electrodes. The stacked cathodes, anodes and electrodes form a flat but large block of active material. In particular, each electrode comprises a layer of active material arranged on a conductor foil, with the conductor foils extending outwards with an uncoated section from the block of active material. The uncoated section of an arrester foil forms the arrester so that an electric current can be discharged from the block of active material or fed to the block of active material. The conductors of the anodes and the conductors of the cathodes are each connected to one another in order to electrically connect the respective electrodes of the same type in parallel.

Batteries, in particular lithium-ion batteries, are increasingly being used to drive motor vehicles. Batteries are usually composed of battery cells and/or battery modules comprising several battery cells.

The blocks of active material are arranged individually or in groups in a housing, thus forming a battery cell. In particular, the most effective possible use of the installation space should be achieved. The value Wh/I [watt hour per liter] is an important parameter of a battery cell. In the current construction of prismatic cells, a certain proportion of a housing volume can be used for a cell coil/cell stack.

In a current design of a battery cell, a cell stack/cell coil or a block of active material is arranged within a deep-drawn housing part. The deep-drawn housing part is connected to a cover group, which usually has a current collector for contacting the conductors of one type of electrode, a receiving grid for receiving and electrically insulating the current collector from the housing part, a connection for providing electrical contact between the current collector and the environment of the battery cell, and an insulator for isolating the connection from the housing.

The arrangement of the cover as part of the housing, the connection of the arrester to the current collector and the implementation of the electrical contact through the cover to the outside requires space.

From the US 10,290,841 B2 a battery with a housing and a cover for closing the housing is known. The lid has three layers, two made of plastic and one metal layer.

From the U.S. 10,707,461 B2 a battery with a housing and a cover for closing the housing is known. The lid has three layers, two metal layers and one layer made of a plastic.

From the U.S. 2004/0061476 A1 a prismatic battery cell with a housing is known. The housing is closed by a cover on one narrow side.

The object of the present invention is to at least partially solve the problems cited with reference to the prior art. In particular, a battery cell is to be proposed which, with a cover element, enables effective use of space in the housing. In particular, the complexity of the cover element is to be reduced and at the same time the tightness of the battery cell is to be ensured, in particular when the electrical contacts are passed through the cover element.

A battery cell with the features according to patent claim 1 contributes to the solution of these tasks. Advantageous developments are the subject matter of the dependent patent claims. The features listed individually in the patent claims can be combined with one another in a technologically meaningful manner and can be supplemented by explanatory facts from the description and/or details from the figures, with further embodiment variants of the invention being shown.

A battery cell is proposed, at least comprising a housing and at least one block of active material arranged therein. The block of active material has a plurality of electrodes, comprising at least one anode and at least one cathode, and a separator between the different electrodes. The housing has a casing part with at least one open end face. The end face is at least partially closed by a cover element. The cover element is multi-layered. One The first layer of the cover element, which is directed toward the block, and a second layer of the cover element, which is directed toward the area surrounding the battery cell, are each made of an electrically conductive material. A third layer is arranged between the first layer and the second layer, via which the cover element is connected to the casing part. A first intermediate layer is arranged between the first layer and the third layer and a second intermediate layer, each made of an electrically non-conductive material, is arranged between the second layer and the third layer. At least one electrically conductive connecting element extends along a radial direction through the cover element, starting from the first layer to the second layer, for the electrically conductive connection of the first layer to the second layer.

In a known manner, a block of active material comprises in particular at least one anode and at least one cathode as electrodes. A separator is arranged between the anode and the cathode. The active materials are arranged in particular as coatings on electrically conductive carrier materials, which serve in particular as conductors. Specifically, the anode, the cathode and the separator are each referred to as a sheet, which is stacked one on top of the other.

A block of active material can also be designed as a pouch cell, which is therefore arranged with its own housing in the housing described here, comprising the casing part and the core part. A pouch cell comprises a deformable housing consisting of a pouch film and is therefore not a prismatic cell (with a dimensionally stable housing). A pouch film is a well-known deformable housing part that is used as a housing for so-called pouch cells. It is a composite material, e.g. B. comprising a plastic and aluminum.

In particular, the electrodes are arranged in a known manner to form the block of active material and are acted upon by an electrolyte or an electrolyte liquid.

In particular, a block of active material has a multiplicity of electrodes and separators which are stacked on top of one another or stacked and then wound together. The layers can be arranged as a single sheet stack, lamination, Z-fold, jelly roll, each in any number.

The electrodes are designed in particular in the form of foils, ie they have a large side surface and a small thickness. In particular, a coating with active material is arranged on the side surface or on each side surface of the electrode. The separators are each arranged between the side surfaces of the adjacently arranged different electrodes. In particular, uncoated parts of the electrodes extend out of the block of active material as conductors.

In particular, the anodes and the cathodes are connected in parallel within the block of active material or within the housing, so that the conductors of a plurality of anodes are electrically conductively connected to one another and the conductors of a plurality of cathodes are electrically conductively connected to one another.

The housing of the battery cell is in particular only plastically deformable. The housing is also referred to as a hard case and the battery cell z. B. as a prismatic cell.

The battery cell is in particular a lithium-containing battery cell, in particular a secondary cell, ie a rechargeable battery cell.

In the case of the ready-to-use battery cell, the housing is in particular made in one piece. The housing is composed of at least the casing part and the at least one cover element, which are only connected to one another during the manufacture of the housing, but are previously present as individual parts.

The casing part is in particular of cylindrical design, ie it only has surfaces running parallel to an axial direction.

In particular, aluminum or an aluminum alloy or other materials can be used as the material for the housing or the casing part. The material used should in particular have good thermal conductivity, preferably comparable to or higher than the thermal conductivity of aluminum.

The jacket part can be made in one piece or in several pieces. In particular, it has at least one open end face. The end face is at least partially closed by a cover element. The cover element is designed in multiple layers. The individual layers extend in particular parallel to one another and preferably parallel to the open end face. A first layer is arranged on the side of the cover element oriented towards the block. A second layer of the cover element is arranged on the opposite side of the cover element, which is oriented towards the environment of the battery cell. The first layer and the second layer are in particular each made of an electrically conductive material.

In particular, a third layer is arranged between the first layer and the second layer, via which the cover element is connected to the casing part. In particular, the cover element is connected to the casing part exclusively via the third layer. In particular, only the third layer forms a materially bonded first connection with the casing part.

In particular, a first intermediate layer is arranged between the first layer and the third layer, and a second intermediate layer, each made of an electrically non-conductive material, is arranged between the second layer and the third layer. The third layer is electrically insulated from the other, electrically conductive components of the cover element via the intermediate layers.

At least one electrically conductive connecting element extends along a radial direction through the cover element, starting from the first layer to the second layer, for the electrically conductive connection of the first layer to the second layer.

In particular, the housing is essentially cuboid. In particular, the largest side surfaces of the housing extend parallel to the largest side surfaces of the electrodes of the block. The largest side faces are spaced from each other by four peripheral faces. In each case, two mutually opposite circumferential surfaces are in particular of the same size. The pairs of peripheral surfaces formed in this way are in particular of different sizes. The at least one cover element is arranged in particular on one of the smallest peripheral surfaces. Alternatively, the at least one cover element is arranged in particular on the largest peripheral surface. In particular, the largest side surfaces of the housing are formed by the casing part. In particular, at least two or even three of the peripheral surfaces are additionally formed by the casing part.

In particular, at least the at least one anode or the at least one cathode is electrically conductively connected to the first layer. In particular, all anodes or all cathodes of the at least one block are electrically conductively connected to the first layer. The electrodes are connected to the first layer in particular via their conductors. The connection is designed in particular as an integral connection. The integral connection can be implemented in particular by soldering or welding, in particular laser welding.

In particular, the conductors of the electrodes of the same type of the at least one block extend out of a side surface of the block. In particular, the conductors are brought together and arranged one above the other. The arresters assembled in this way can be bonded together or individually to the first layer. The cover element can still be provided as an individual part and separately from the casing part.

In particular, the cover element is only arranged on the casing part and connected thereto after the conductors have been connected to the first layer.

In particular, at least the at least one anode or the at least one cathode can be electrically conductively connected via the cover element to a circuit arranged outside of the battery cell. In particular, the electrically conductive contacting of the circuit takes place via the second layer.

In particular, the third layer is arranged in the cover element in an electrically insulated manner relative to the connecting element and relative to the first layer and the second layer. In particular, the cover element is connected to the casing part exclusively via the third layer, that is to say neither via the first layer nor via the second layer.

In particular, aluminum or an aluminum alloy, copper or a copper alloy or other materials can be used as the material for the first and second layer and for the connecting element. The material used should in particular have good electrical conductivity, preferably comparable to or higher than the conductivity of aluminum.

In particular, a material suitable for the casing part, at least a material suitable for a materially bonded first connection with the casing part, should be selected as the material for the third layer. In particular, the material of the third layer corresponds to the material of the jacket part.

In particular, the casing part is arranged in an electrically insulated manner with respect to the connecting element and with respect to the first layer and the second layer.

In particular, the at least one connecting element is connected to the first layer and to the second layer with a material fit or with a form fit in relation to the radial direction.

The connecting element can, for. B. be designed as a bolt. The bolt can be designed essentially symmetrically along the radial direction. It can also be designed to be rotationally symmetrical, for example around an axis of the connecting element that extends along the radial direction.

The connecting element can, for. B. be inserted into an opening provided for receiving the connecting element in the cover element. The opening is designed in particular as a through-opening in the cover element, ie it is provided as an opening in every layer of the multi-layer cover element. The connection element can be arranged in the opening via an interference fit. In particular, an electrically conductive contacting of the first layer and the second layer with the connecting element should be ensured.

The connecting element can be connected to the first layer and/or to the second layer via a soldered or welded connection, ie via a second connection. Alternatively or additionally, the connecting element can be connected to the layers via a third connection that is form-fitting in relation to the radial direction. For example, for this purpose the connecting element can be deformed at least at one end after it has been arranged in the opening, e.g. B. in the manner of a rivet, so that the form fit is realized.

The cover element can have one or more connecting elements. The geometry and/or the material of the connecting element and/or the number of connecting elements can, in particular, with regard to the properties ensuring the most effective conduction of an electric current, e.g. B. line cross-section, conductivity, etc., are selected appropriately.

The pressure relief valve can also be formed by the connecting element.

In particular, the third layer is bonded to the casing part. In particular, the first connection between the third layer and the jacket part forms a gas-tight connection.

In particular, the cover element has a pressure relief valve. In particular, when the battery cell is in operation, the overpressure valve should be able to reduce an overpressure occurring within the battery cell. The pressure relief valve can also be designed as a type of bursting opening, which means that it cannot be closed again after it has been opened once. Alternatively, the pressure relief valve can be designed as a repeatedly closable valve.

In particular, at least the first intermediate layer or the second intermediate layer consists of a fluorine rubber, PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy polymers, i.e. fully fluorinated plastics, copolymers of tetrafluoroethylene (TFE) and perfluoroalkoxy vinyl ethers, such as perfluorovinyl propyl ether) or a ceramic.

PTFE and PFA in particular are gas-tight and can therefore ensure that no or only a small amount of electrolyte can diffuse out of the housing into the environment

In particular, the casing part additionally has at least one second open end face, in particular opposite to the first end face, which is closed by a further multi-layer cover element.

In particular, the casing part is an extruded profile, ie produced by extrusion, or by extrusion or deep-drawing.

In the extrusion process, a starting material is heated to a forming temperature and pressed through a shaping die at high pressure. The resulting profile is moved out of the die along a feed direction.

In the impact extrusion process, the bottom of the component produced is cut off in particular, thus forming the casing part.

A cover element for the battery cell described is also proposed, the cover element being designed in multiple layers.

The battery cell can be used in particular in a motor vehicle for storing electrical energy. In particular, it is used in a motor vehicle to provide electrical energy for a traction drive.

The statements regarding the battery cell apply in particular equally to the cover element and the motor vehicle and vice versa.

The use of indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral. Correspondingly introduced terms or components are to be understood in such a way that they are present at least once and in particular can also be present several times.

As a precaution, it should be noted that the numerals used here (“first”, “second”, ...) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and/or sequence of these objects, sizes or make processes mandatory for each other. Should a dependency and/or order be necessary, this is explicitly stated here or it will be obvious to the person skilled in the art when studying the concrete described embodiment. If a component can occur several times (“at least one”), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.

• 1: eine Elektrode mit einem Ableiter in einer Draufsicht;
• 2: eine Batteriezelle in einer Seitenansicht während des Zusammenbaus;
• 3: die Batteriezelle nach 2 in einer Seitenansicht nach dem Zusammenbau;
• 4: eine erste Ausführungsvariante eines Deckelelements in einer Draufsicht;
• 5: das Deckelelement nach 4 in einer Seitenansicht;
• 6: ein Detail der 5;
• 7: eine zweite Ausführungsvariante eines Deckelelements in einer Draufsicht;
• 8: das Deckelelement nach 7 in einer Seitenansicht;
• 9: eine dritte Ausführungsvariante eines Deckelelements in einer Draufsicht;
• 10: das Deckelelement nach 9 in einer Seitenansicht;
• 11: eine vierte Ausführungsvariante eines Deckelelements in einer Draufsicht;
• 12: das Deckelelement nach 11 in einer Seitenansicht; und
• 13: ein Detail der 12.

The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be pointed out that the invention should not be limited by the exemplary embodiments given. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. Show it:

• 1 : an electrode with a conductor in a plan view;
• 2 : a battery cell in a side view during assembly;
• 3 : the battery cell after 2 in a side view after assembly;
• 4 : a first embodiment variant of a cover element in a plan view;
• 5 : the cover element after 4 in a side view;
• 6 : a detail of 5 ;
• 7 : a second embodiment variant of a cover element in a plan view;
• 8th : the cover element after 7 in a side view;
• 9 : a third embodiment variant of a cover element in a plan view;
• 10 : the cover element after 9 in a side view;
• 11 : a fourth embodiment variant of a cover element in a plan view;
• 12 : the cover element after 11 in a side view; and
• 13 : a detail of 12 .

1 shows an electrode 4 with a conductor 19 in a plan view. The electrodes 4 have a coated and an uncoated area. The electrode 4 is foil-like, ie it has a large side surface and a small thickness. A coating with active material is arranged on the side surface or on each side surface of the electrode 4 . Uncoated parts of the electrodes 4 serve as conductors 19.

2 shows a battery cell 1 in a side view during assembly. 3 shows the battery cell 1 2 in a side view after assembly. 4 shows a first embodiment of a cover element 8 in a plan view. 5 shows the cover element 8 after 4 in a side view. 6 shows a detail of 5 . the 2 until 6 are explained together below.

The battery cell 1 comprises a housing 2 and at least one block 3 of active material arranged therein. The block of active material has a plurality of electrodes 4, including anodes and cathodes, and a separator between the different electrodes 4 in each case. The housing 2 has a casing part 5 with two open end faces 6, 7. The end faces 6 , 7 are each closed by a cover element 8 .

The anodes and the cathodes are each connected in parallel with one another within the housing 2, so that the conductors 19 of a plurality of anodes are electrically conductively connected to one another and the conductors 19 of a plurality of cathodes are electrically conductively connected to one another. The conductors 19 of the similar electrodes 4 of the block 3 each extend out of a side surface of the block 3 opposite the respective end face 6, 7. The conductors 19 are brought together and arranged one above the other. The conductors 19 folded together in this way are cohesively connected to the first layer 9 of the respective cover element 8 . The cover element 8 is still provided as an individual part and separately from the casing part 5 (see FIG 2 ).

Each cover element 8 is only arranged on the casing part 5 and connected thereto after the arrester 19 has been connected to the first layer 9 (see FIG 3 ).

The electrodes 4 are connected via the respective cover element 8 to a circuit 17 (indicated in Fig 3 ) electrically conductively connectable. The electrically conductive contacting of the circuit 17 takes place via the second layer 11.

The housing 2 is in the ready-to-use battery cell 1 (see 3 ) executed in one piece. The housing 2 consists of the casing part 5 and the two cover elements 8 . The casing part 5 is of cylindrical design, ie it only has surfaces running parallel to an axial direction 20 .

The housing 2 is cuboid. The largest side surfaces of the housing 2 extend parallel to the largest side surfaces of the Electrodes 4 of the block 3, ie transversely to the axial direction 20 and parallel to the radial direction 16. The largest side surfaces are spaced apart from one another by four peripheral surfaces. In each case, two mutually opposite peripheral surfaces are of the same size. The pairs of peripheral surfaces formed in this way are of different sizes. The cover elements 8 are arranged on the end faces 6, 7 formed by the smallest peripheral surfaces.

The shell part 5 is made in one piece. It has two open end faces 6,7. The end faces 6, 7 are closed by a cover element 8.

The cover element 8 is designed in multiple layers. The individual layers 9 , 11 , 12 of the cover element 8 extend parallel to one another and parallel to the end faces 6 , 7 . On the side of the cover element 8 oriented toward the block 3 , a first layer 9 is arranged.

A second layer 11 of the cover element 8 is arranged on the opposite side of the cover element 8 oriented towards the environment 10 of the battery cell 1 . The first layer 9 and the second layer 11 are each made of an electrically conductive material.

A third layer 12 is arranged between the first layer 9 and the second layer 11, via which the cover element 8 is connected to the casing part 6. A first intermediate layer 13 is arranged between the first layer 9 and the third layer 12 and a second intermediate layer 14 made of an electrically non-conductive material is arranged between the second layer 11 and the third layer 12 . Two electrically conductive connecting elements 15 extend along a radial direction 16 through the cover element 8, starting from the first layer 9 to the second layer 11 for the electrically conductive connection of the first layer 9 to the second layer 11.

The third layer 12 is arranged between the first layer 9 and the second layer 11, via which the cover element 8 is connected to the casing part 5. The cover element 8 is connected to the casing part 5 exclusively via the third layer 12 . Only the third layer 12 forms an integral first connection 21 with the jacket part 5 .

The third layer 12 is electrically insulated from the other, electrically conductive components of the cover element 8 via the intermediate layers 13 , 14 .

The third layer 12 is arranged in the cover element 8 so that it is electrically isolated from the connecting elements 15 and from the first layer 9 and the second layer 11 . The cover element 8 is connected to the casing part 5 exclusively via the third layer 12 , ie neither via the first layer 9 nor via the second layer 11 . The third layer 12 is integrally connected to the casing part 5 . The first connection 21 between the third layer 12 and the jacket part 5 forms a gas-tight connection.

The casing part 5 is arranged electrically isolated from the connecting element 15 and from the first layer 9 and the second layer 11 .

The connecting elements 15 are integrally connected to the first layer 9 and to the second layer 11 .

The connecting element 15 are each designed as a bolt. The bolt is designed to be essentially symmetrical along the radial direction 16 . It is additionally designed to be rotationally symmetrical about an axis of the connecting element 15 that extends along the radial direction 16 .

The connecting element 15 is arranged in an opening in the cover element 8 provided for receiving the connecting element 15 . The opening is designed as a through opening in the cover element 8, so it is provided as an opening in each layer 9, 11, 12, 13, 14 of the multi-layer cover element 8. An electrically conductive contacting of the first layer 9 and the second layer 11 is ensured with the connecting element 15 .

The connecting element 15 is connected to the first layer 9 and to the second layer 11 via a materially bonded second connection 22 .

The cover element 8 has an overpressure valve 18 . During operation of the battery cell 1 , an overpressure occurring within the battery cell 1 should be able to be reduced via the pressure relief valve 18 . The pressure relief valve 18 is designed as a kind of bursting opening, which cannot be closed again once it has been opened.

7 shows a second embodiment variant of a cover element 8 in a plan view. 8th shows the cover element 8 after 7 in a side view. the 7 and 8th are described together below. On the remarks on the 1 until 6 is referenced.

In contrast to the first embodiment variant, the connecting elements 15 are connected to the layers 9 , 11 , 12 , 13 , 14 via a third connection 23 which is form-fitting in relation to the radial direction 16 . For this, the connecting elements 15 are shaped at both ends, e.g. B. in the manner of a Rivets that the form fit is realized. A cohesive second connection 22 between the connecting element 15 and the respective layer 9, 11 is not required here.

9 shows a third embodiment of a cover element 8 in a plan view. 10 shows the cover element 8 after 9 in a side view. the 9 and 10 are described together below. On the remarks on the 1 until 8th is referenced.

In contrast to the first and second embodiment variant, the cover element 8 has only one connecting element 15 . However, this extends over a large area over a large portion of each individual layer 9, 11, 12, 13, 14. As in the first embodiment variant, the connecting element 15 is connected to the first layer 9 and the second layer 11 in a materially bonded manner.

The pressure relief valve 18 is formed by the connecting element 15 .

11 shows a fourth embodiment of a cover element 8 in a plan view. 12 shows the cover element 8 after 11 in a side view. 13 shows a detail of 12 . the 11 until 13 are described together below. To the remarks 4 until 6 is referenced.

In contrast to the first embodiment variant, the connecting elements 15 are not designed to be rotationally symmetrical.

reference list

1

battery cell

2

Housing

3

block

4

electrode

5

jacket part

6

first face

7

second face

8th

cover element

9

first layer

10

vicinity

11

second layer

12

third layer

13

first intermediate layer

14

second intermediate layer

15

fastener

16

radial direction

17

circuit

18

pressure relief valve

19

arrester

20

axial direction

21

first connection

22

second connection

23

third connection

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• US10290841B2 [0007]
• US10707461B2 [0008]
• US20040061476A1 [0009]

Claims (10)

Battery cell (1), at least comprising a housing (2) and arranged therein at least one block (3) of active material, the block (3) of active material having a plurality of electrodes (4), comprising at least one anode and at least one cathode, and between the different electrodes (4) has a separator; wherein the housing (2) has a casing part (5) with at least one open end face (6, 7); wherein the end face (6, 7) is at least partially closed by a cover element (8); wherein the cover element (8) is designed in multiple layers; wherein a first layer (9) facing the block (3) of active material and a second layer (11) facing the environment (10) of the battery cell (1) are each made of an electrically conductive material, with the first layer (9 ) and the second layer (11), a third layer (12) is arranged, via which the cover element (8) is connected to the casing part (5); a first intermediate layer (13) being arranged between the first layer (9) and the third layer (12) and a second intermediate layer (14) each made of an electrically non-conductive material being arranged between the second layer (11) and the third layer (12). is; at least one electrically conductive connecting element (15) extending along a radial direction (16) through the cover element (8) starting from the first layer (9) to the second layer (11) for the electrically conductive connection of the first layer (9). of the second layer (11). Battery cell (1) after Claim 1 , wherein at least the at least one anode or the at least one cathode is electrically conductively connected to the first layer (9). Battery cell (1) according to one of the preceding claims, at least the at least one anode or the at least one cathode being electrically conductively connectable via the cover element (8) to a circuit (17) arranged outside the battery cell (1). Battery cell (1) according to one of the preceding claims, wherein the third layer (12) is arranged in the cover element (8) so that it is electrically isolated from the at least one connecting element (15) and from the first layer (9) and the second layer (11). . Battery cell (1) according to one of the preceding claims, wherein the at least one connecting element (15) is connected to the first layer (9) and to the second layer (11) with a material fit or with a form fit in relation to the radial direction (16). Battery cell (1) according to one of the preceding claims, wherein the third layer (12) is materially connected to the casing part (5). Battery cell (1) according to one of the preceding claims, wherein the cover element (8) has a pressure relief valve (18). Battery cell (1) according to one of the preceding claims, wherein at least the first intermediate layer (13) or the second intermediate layer (14) consists of a fluorine rubber, PTFE, PFA or a ceramic Battery cell (1) according to one of the preceding claims, wherein the casing part (5) is an extruded profile or is produced by extrusion. Cover element (8) for a battery cell (1) according to one of the preceding claims, wherein the cover element (8) is designed in multiple layers.

Images