Battery cell for traction battery, battery cell stack for electric vehicle, electric vehicle, and method for manufacturing battery cell and battery cell stack

Abstract

The present disclosure provides a battery cell (130) for a traction battery of an electric vehicle. The battery cell (130) comprises a battery cell body having at least a first side (510) and a second side (520), wherein the second side (520) is arranged adjacent to the first side (510). The vent valve is arranged on a first side (510) of the battery cell body. Further, a cover element (300) covers at least a portion of the exhaust valve and extends onto the second side (520). In addition, a battery cell stack, a battery system and an electric vehicle are described. The invention further relates to a method for producing the battery cells (130) and to a method for producing a stack of battery cells.

Description

Technical Field

[0001] The present disclosure relates to a battery cell for a traction battery of an electric vehicle.

[0002] The present disclosure also relates to a battery cell stack including such a battery cell, a battery system including such a battery cell stack, and an electric vehicle including such a battery cell stack and / or such a battery system.

[0003] Furthermore, the present disclosure relates to a method for producing a battery cell and a method for producing a battery cell stack. Background Art

[0004] A battery electric vehicle or hybrid electric vehicle may comprise a plurality of battery cells arranged in one or more battery cell stacks in a battery system. The battery cell system is configured to provide electrical energy for driving the vehicle. The battery system may alternatively be referred to as a battery pack or traction battery pack. It goes without saying that the battery system needs to be operated in a safe manner. For this purpose, known battery cells are equipped with so-called degassing valves, which allow hot gases to leave the battery cell in the event of a thermal event within the battery cell. Summary of the Invention

[0005] Therefore, one object of the present disclosure is to further improve battery cells and battery systems comprising such battery cells. The improvements should particularly relate to the protection of battery systems against thermal events.

[0006] This problem is at least partially solved or alleviated by the subject matter of the present disclosure.

[0007] According to a first aspect, a battery cell for a traction battery of an electric vehicle is provided. The battery cell includes a battery cell body having at least a first side and a second side, wherein the second side is arranged adjacent to the first side. A vent valve is arranged on the first side of the battery cell body. Furthermore, a cover element covers at least a portion of the vent valve and extends onto the second side. The cover element protects the associated battery cell from thermal events occurring in other battery cells in the same battery system and / or battery stack. At the same time, the cover element does not interfere with the function of the vent valve covered by the cover element. In short, if a battery cell with the cover element experiences a thermal event, the vent valve opens to allow hot gases to escape from the battery cell. The cover element is displaced by these hot gases, for example, by being pushed back or deformed. However, if a thermal event occurs in another battery cell, the cover element protects the associated battery cell, particularly the vent valve it covers, from the undesirable effects of the hot gases generated by the other battery cell. The fact that the cover element extends onto the second side ensures that the cover element is securely attached to the battery cell body. This is due to several advantages. First, the portion of the cover element that extends onto the second side can be used for any type of attachment to the battery cell body. Thus, the cover element can be reliably and flexibly attached to the battery cell body. Secondly, the portion of the cover element extending onto the second side can be clamped between the battery cell including the cover element and an adjacent battery cell. This further enhances the attachment. Overall, the operational safety of the battery cell is enhanced.

[0008] It should be noted that battery cells according to the present disclosure can generally be of any shape. In one example, the battery cells are so-called prismatic battery cells, i.e., the battery cells have a generally rectangular parallelepiped shape. In another example, the battery cells have a cylindrical shape. More generally, the battery cells can have any shape that allows for the arrangement of several battery cells adjacent to each other in a battery cell stack.

[0009] According to one example, the battery cell body may further include a third side, wherein the second and third sides are arranged adjacent to the first side at opposite edges of the first side. The cover element further extends onto the third side. In this configuration, the reliability of the cover element's attachment to the battery cell body is further enhanced because the portion of the cover element extending onto the third side can be used to attach the cover element to the battery cell body. Furthermore, the portion of the cover element extending onto the third side can be clamped between the battery cell including the cover element and an adjacent battery cell. This further enhances attachment.

[0010] When a battery cell including a cover element is arranged between two other battery cells, a compressive force can be exerted on the battery cell including the cover element. Thus, the cover element can be compressed by two adjacent battery cells, one of which is arranged adjacent to a second side of the battery cell including the cover element, and one of which is arranged adjacent to a third side of the battery cell including the cover element.

[0011] It should be noted that, in the case where the cover element extends onto only one side of a battery cell, the protection provided by the cover element from gases discharged from another battery cell may be higher if these gases originate from a battery cell arranged on the same side as the second or third side on which the cover element extends to the battery cell. In this case, the gases may push the cover element onto the vent valve.

[0012] According to one example, the cover element can be connected to at least one of the first, second, and third sides via an adhesive. Thus, the cover element is securely attached to the battery cell body. This applies when the battery cells are used during assembly, such as when assembling a battery system or battery cell stack including the battery cells. According to one example, the adhesive can be configured to securely attach the cover element to the battery cell body during assembly, but not at temperatures typically experienced during a thermal event or over the lifetime of the battery cells. This enhances the selection of a suitable adhesive and facilitates attaching the cover element to the battery cell body. Note that during a thermal event with an adjacent battery cell, the cover element can be held in place due to the fact that at least a portion of the cover element extends onto the second and / or third sides of the battery cell body and is thereby clamped by the adjacent battery cell. The same applies during use of the battery cell in the absence of a thermal event, i.e., during the lifetime of the battery cell. In other words, the mechanical clamping force provided by the compression of the battery cells in the associated battery cell stack serves to hold the cover element in place throughout the life of the battery cell stack and the duration of the thermal event. Since this compression is already used in the battery cell stack to ensure, for example, cell durability, it can be used to accomplish two tasks.

[0013] According to one example, the cover element can extend at least 3 mm and / or at most 30 mm onto at least one of the second side and the third side. In doing so, the minimum extension of 3 mm onto the second side and / or the third side can provide a sufficient amount of cover element between adjacent battery cells so that the compressive force can be applied over a sufficiently large area of the cover element. Furthermore, this configuration allows the cover element to be securely attached to the battery cell body, for example, using an adhesive.

[0014] According to one example, the width of the cover element in a direction perpendicular to the direction in which the cover element extends to the second side can be at least equal to the maximum width of the exhaust valve in that direction. This means that the width of the cover element is equal to the maximum width of the exhaust valve, or the width of the cover element is greater than the maximum width of the exhaust valve. As a result, the exhaust valve is securely covered while requiring relatively little material for the cover element.

[0015] According to one example, the cover element may include at least one of fiberglass, mica material, and silicone rubber, all of which are heat-resistant enough to reliably protect the covered vent valve from possible effects of hot gases generated by a thermal event in another battery cell.

[0016] According to one example, the cover element can have a thickness in the range of 0.05 mm to 1.0 mm. This thickness has been shown to be sufficient to produce the desired protective effect. At the same time, it is small enough to allow a portion of the cover element to be clamped between adjacent battery cells without negatively affecting them, for example by generating force peaks in the area where the cover element contacts the battery cell body.

[0017] According to one example, the cover element may be strip-shaped. This facilitates application of the cover element because the strip-shaped cover element can be easily and reliably handled during manufacturing. At the same time, the strip shape is a relatively simple form that allows efficient production of the cover element.

[0018] It should be noted that the use of a cover element (e.g., in the form of a thin layer of material, such as fiberglass (e.g., fiberglass tape), mica material, and / or silicone rubber) that directly covers the vent valve of a battery cell provides a reliable way to protect the vent valve of a battery cell from gases generated by thermal events in adjacent battery cells. Such a thin layer can serve as a relatively inexpensive and simple shield to prevent hot pressurized gases that are known to melt the aluminum vent valve of a battery cell and have the potential to cause the thermal event to propagate in other battery cells that were initially unaffected by the thermal event.

[0019] According to one example, a mechanical connection interface can be arranged on the first side. The mechanical connection interface can be configured to structurally connect the battery cell to a structural element of the vehicle. This means that the battery cell can serve as a structural component of the vehicle. Thus, the battery cell can support the loads incurred during vehicle operation. This structural connection can provide the opportunity to achieve additional mechanical stability for the vehicle, provided by the battery cell. The remaining structural components of the vehicle can be adapted to this effect, thereby reducing the overall weight of the vehicle while maintaining overall mechanical stability.

[0020] According to a second aspect, a battery cell stack for an electric vehicle is provided. The battery cell stack includes a plurality of battery cells arranged adjacent to each other along an arrangement direction. At least one battery cell of the plurality of battery cells is a battery cell according to the first aspect. A portion of the cover element extending onto the second side of the battery cell according to the first aspect contacts an adjacent battery cell. Additionally or alternatively, a portion of the cover element extending onto the third side of the battery cell according to the first aspect contacts an adjacent battery cell. In other words, the portion of the cover element extending onto the second side and / or the portion of the cover element extending onto the third side can be clamped between the battery cell including the cover element and the adjacent battery cell. Therefore, the above-mentioned advantages of a single battery cell can therefore be applied and applicable to a battery cell stack.

[0021] According to one example, the battery cells of the battery cell stack can be compressed along the arrangement direction. Therefore, a compressive force is applied to the portion of the cover element that contacts the adjacent battery cells, i.e., the portion of the cover element extending to the second side and / or the portion of the cover element extending to the third side.

[0022] According to a third aspect, a battery system for an electric vehicle is provided, comprising a battery cell stack according to the second aspect. Thus, at least some of the battery cells of the battery system are protected from the effects of a thermal event occurring in another battery cell in the same battery system and / or in the same cell stack. This protection is provided by the cover element. At the same time, the cover element does not interfere with the function of the exhaust valve covered by the cover element. Therefore, in short, if a battery cell with a cover element experiences a thermal event, the exhaust valve opens to allow hot gases to leave the battery cell. The cover element is removed by these hot gases, for example pushed back or deformed. However, if a thermal event occurs in another battery cell, the cover element protects the associated battery cell, in particular the exhaust valve it covers, from the undesirable effects of the hot gases generated by the other battery cell. The fact that the cover element extends onto the second side ensures that the cover element is reliably attached to the battery cell body. Therefore, the battery system meets particularly high standards in terms of safety and reliability.

[0023] According to a fourth aspect, an electric vehicle is provided, comprising a battery cell stack according to the second aspect and / or a battery system according to the third aspect. Due to the fact that the battery cell stack and / or the battery system meet particularly high standards with regard to safety and reliability, this also applies to electric vehicles.

[0024] According to one example, the battery stack and / or battery system can be a structural component of the vehicle. This means that the battery stack and / or battery system can function as a structural component of the vehicle. Thus, the battery stack and / or battery system can support the loads incurred during vehicle operation. This offers the possibility of achieving additional mechanical stability for the vehicle, provided by the battery stack and / or battery system. The remaining structural components of the vehicle can be adapted to this effect, making it possible to reduce the overall weight of the vehicle while maintaining overall mechanical stability.

[0025] According to a fifth aspect, a method for manufacturing a battery cell is provided, wherein the battery cell comprises: a battery cell body having at least a first side and a second side, wherein the second side is arranged adjacent to the first side; and a vent valve arranged on the first side of the battery cell body. The method comprises providing a battery cell body and arranging a cover element on the battery cell body such that the cover element covers at least a portion of the vent valve and extends onto the second side. Thus, using this method, a battery cell can be manufactured that is protected from thermal events occurring in another battery cell in the same battery system and / or the same cell stack.

[0026] According to a sixth aspect, a method for manufacturing a battery cell stack is provided, the battery cell stack including a plurality of battery cells arranged adjacent to one another along an arrangement direction. The method comprises: providing a plurality of battery cells, wherein at least one battery cell according to the first aspect is included among the plurality of battery cells; and arranging the plurality of battery cells adjacent to one another along the arrangement direction such that a portion of a cover element extending to a second side of a battery cell according to any one of the first aspects contacts the adjacent battery cell, and / or such that a portion of the cover element extending to a third side of a battery cell according to the first aspect contacts the adjacent battery cell. Thus, using this method, a battery cell stack can be manufactured, the battery cell stack including a battery cell protected from a thermal event occurring in another battery cell in the same battery system and / or the same battery stack.

[0027] It should be noted that the above examples can be combined with each other regardless of the aspects involved.

[0028] These and other aspects of the disclosure will be apparent from and elucidated with reference to the examples described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Examples of the present disclosure will be described below with reference to the following drawings.

[0030] Figure 1An electric vehicle according to the present disclosure is shown, which includes a battery system according to the present disclosure, the battery system having a battery cell stack according to the present disclosure and a plurality of battery cells according to the present disclosure;

[0031] Figure 2 Shown Figure 1 a portion of two battery cell stacks of a vehicle, wherein the cover element is not shown;

[0032] Figure 3 Another example of a battery cell stack is shown;

[0033] Figure 4 A further example of a battery cell stack is shown, wherein cover elements are shown only for some of the battery cells;

[0034] Figure 5 An example of a battery cell is shown in which the cover element has not yet been attached to the battery cell body;

[0035] Figure 6 An example of a battery cell is shown in which a cover member is partially attached to the battery cell body;

[0036] Figure 7 An example of the battery cell is shown wherein the cover element is fully attached to the battery cell body; and

[0037] Figure 8 Shown as a separate representation Figures 5 to 7 A cover element of a battery cell. DETAILED DESCRIPTION

[0038] The drawings are merely schematic representations and serve merely to illustrate examples of the present disclosure. Identical or equivalent elements are in principle provided with the same reference numerals.

[0039] Figure 1 An electric vehicle 100 is shown.

[0040] The electric vehicle 100 comprises a battery system 110 , which in this example is a traction battery. Furthermore, the battery cell system 110 is a structural component of the vehicle 100 .

[0041] The battery system 110 includes a plurality of battery cell stacks 120 arranged in a battery housing. Figure 1 In the schematic diagram of FIG, only one battery cell stack 120 is visible.

[0042] Each battery cell stack 120 includes a plurality of battery cells 130. For better visibility, Figure 1 Only some of the battery cells 130 are provided with reference numerals.

[0043] exist Figure 2 , two battery cell stacks 120 of the battery system 110 are shown in more detail. In addition, the individual battery cells 130 are shown in more detail. For better visibility, bus bars 150 for connecting the individual battery cells 130 are illustratively shown only for some of the battery cells 130 in one battery cell stack 120. Figure 3 and Figure 4 Additional examples of battery cell stacks 120 are shown.

[0044] Each battery cell stack 120 includes a plurality of battery cells 130 arranged adjacent to each other along an arrangement direction. In other words, the battery cells 130 collectively forming the battery cell stack 120 are arranged side by side along the arrangement direction.

[0045] In this example, all battery cells 130 are so-called prismatic battery cells, ie, the battery cells 130 are in the shape of a rectangular parallelepiped.

[0046] Furthermore, when arranged in the housing of the battery system 110 , the battery cells 130 united to form the battery cell stack 120 are compressed along the arrangement direction.

[0047] Each battery cell 130 has a battery cell body. Due to the rectangular parallelepiped shape, the battery cell body has a total of six sides.

[0048] The first side 510 is defined as a side of the battery cell body where the electrical terminals are provided.

[0049] The second side 520 is disposed adjacent to the first side 510 , ie, the first side and the second side share one edge of the battery cell body.

[0050] The third side 530 is also disposed adjacent to the first side 510. Thus, the first side 510 and the third side 530 also share one edge of the battery cell body.

[0051] Furthermore, the second side 520 and the third side 530 are arranged at opposite edges of the first side 510 .

[0052] The battery cell 130 also includes a vent valve 140 disposed on the first side 510 of the battery cell body 130 .

[0053] In this example, the exhaust valve 140 is arranged between the electrical terminals.

[0054] Furthermore, the battery cell 130 includes a cover member 300 .

[0055] In this example, the cover element 300 is a strip-shaped component including glass fibers. Therefore, the cover element 300 can be described as a glass fiber tape.

[0056] The cover element 300 has a length L, a width W and a thickness T (see Figure 8 ).

[0057] The cap member 300 is placed on the battery cell body such that it covers the exhaust valve 140 and extends onto the second side 520 and the third side 530 .

[0058] The width W of the cover element 300 is equal to the maximum width of the exhaust valve 140 , wherein the width of the exhaust valve 140 is measured in the same direction as the width W of the cover element 300 .

[0059] In the example shown in the figures, the cover element 300 extends to approximately 25 mm on the second side 520. Furthermore, the cover element 300 extends to approximately 25 mm on the third side 530.

[0060] The thickness T of the cover element is 0.5 mm.

[0061] Thus, the cover element 300 can include three sections 310, 320, and 330. Section 310 can be described as a middle section 310. Sections 320 and 330 can be described as end sections. The end sections are arranged on opposite sides of the middle section. The middle section has a length L1, the first end section has a length L2, and the second end section has a length L3.

[0062] In the installed state of battery cell 130, middle section 310 contacts first side 510, end section 320 contacts second side 520, and end section 330 contacts third side 530. Furthermore, cover element 300 is connected to the battery cell body, i.e., to first side 510, second side 520, and third side 530, via an adhesive.

[0063] Therefore, in each battery cell 130, the vent valve 140 is individually protected, i.e., individually covered by the cover element 300. Furthermore, the cover element 300 can extend from the side including the vent valve 140 (i.e., the first side 510) to the second side 520 and the third side 530. Therefore, in the assembled state of the battery cell stack 120, the sections 320 and 330 of the cover element 300 are mechanically clamped between the battery cell bodies of adjacent battery cells.

[0064] Thus, if one of the battery cells 130 experiences a thermal event that causes the associated vent valve 140 to open and allow hot gases to escape from the battery cell body of the battery cell 130, the cover element 300 of that battery cell 130 is deformed or removed, allowing the hot gases to escape from the battery cell body. However, for the other battery cells 130, the cover element 300 protects the associated vent valve 140 from the hot gases. This means, in particular, that the vent valve is protected from the thermal effects of the hot gases, i.e., from thermal influences. Therefore, the vent valves 140 of the other battery cells 130 can remain closed, so that the thermal event does not affect the other battery cells 130.

[0065] Figures 5 to 7 A method for manufacturing the battery cell 130 is shown.

[0066] The method includes providing a battery cell body and placing the cap member 300 on the battery cell body such that the cap member 300 covers the vent valve 140 and extends onto the second side 520 and the third side 530 , as described above.

[0067] In this example, the cover member 300 is folded over the battery cell body and attached thereto using an adhesive.

[0068] The method for manufacturing a battery cell stack 120 includes providing a plurality of such battery cells 130. The battery cells 130 are then arranged adjacent to one another along an arrangement direction. This results in each first end section 320 of one of the cover elements 300 contacting an adjacent battery cell 130. The same is true for each second end section 330 of one of the cover elements 300. Consequently, each second end section 330 of the cover element 300 contacts an adjacent battery cell 130.

[0069] As used herein, the phrase "at least one" with respect to a list of one or more entities should be understood to mean at least one entity selected from any one or more entities in the list of entities, but does not necessarily include at least one of each entity specifically listed within the list of entities, and does not exclude any combination of entities in the list of entities. This definition also allows for entities to optionally exist beyond the entities specifically identified within the list of entities to which the phrase "at least one" refers, whether related or unrelated to those entities specifically identified. Thus, as a non-limiting example, "at least one of A and B" (or equivalently, "at least one of A or B," or equivalently, "at least one of A and / or B") may, in one example, refer to at least one A, optionally including more than one A, with no B (and optionally including entities other than B); in another example, refer to at least one B, optionally including more than one B, with no A (and optionally including entities other than A); and in yet another example, refer to at least one A, optionally including more than one A, and at least one B, optionally including more than one B (and optionally including other entities). In other words, the phrases "at least one," "one or more," and "and / or" are open-ended expressions that are both conjunctive and disjunctive in operation. For example, each of the expressions "at least one of A, B, and C," "at least one of A, B, or C," "one or more of A, B, and C," "one or more of A, B, or C," and "A, B, and / or C" may mean A alone, B alone, C alone, A and B together, A and C together, B and C together, A, B, and C together, and optionally any one of the foregoing in combination with at least one other entity.

[0070] Other variations to the disclosed examples may be understood and implemented by those skilled in the art in practicing the claimed disclosure, based on a study of the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other monomer may implement the functions of several items or steps recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used advantageously. The computer program may be stored / distributed on a suitable medium, such as an optical storage medium or solid-state medium provided together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunications systems. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0071] Reference Signs List

[0072] 100 vehicles

[0073] 110 battery system

[0074] 120 battery cell stack

[0075] 130 battery cells

[0076] 140 exhaust valve

[0077] 150 busbar

[0078] 300 cover elements

[0079] 510 The first side of the battery cell

[0080] The second side of the 520 battery cell

[0081] The third side of the 530 battery cell

[0082] 310 middle section of the cover element

[0083] 320 End section of cover element

[0084] 330 End section of cover element

[0085] L The length of the cover element

[0086] Length of the middle section of L1

[0087] L2 Length of the end section

[0088] L3 Length of the end section

[0089] W Width of the cover element

[0090] T is the thickness of the cover element.

Claims

1. A battery cell (130) for a traction battery of an electric vehicle (100), comprising: a battery cell body having at least a first side (510) and a second side (520), wherein the second side (520) is disposed adjacent to the first side (510); a vent valve (140) disposed on the first side (510) of the battery cell body, and A cover member (300) covers at least a portion of the exhaust valve (140) and extends onto the second side (520).

2. The battery cell (130) according to claim 1, wherein: The battery cell body also has a third side (530), wherein the second side (520) and the third side (530) are arranged adjacent to the first side (510) at opposite edges of the first side (510), and wherein the cover element (300) also extends onto the third side (530).

3. The battery cell (130) according to claim 1 or 2, in, The cover element (300) is connected to at least one of the first side (510), the second side (520), and the third side (530) via an adhesive.

4. The battery cell (130) according to any one of claims 1 to 3, in, The cover element (300) extends to at least 3 mm and / or at most 30 mm onto at least one of the second side (520) and the third side (530).

5. The battery cell (130) according to any one of claims 1 to 4, wherein: In a direction perpendicular to the direction in which the cover element (300) extends onto the second side (520), The width (W) of the cover element (300) is at least equal to the maximum width of the exhaust valve (140) in this direction.

6. The battery cell (130) according to any one of claims 1 to 5, wherein: The cover element (300) includes at least one of glass fiber, mica material and silicone rubber.

7. The battery cell (130) according to any one of claims 1 to 6, wherein: The cover element (300) has a thickness (T) in the range of 0.05 mm to 1.0 mm.

8. The battery cell (130) according to any one of claims 1 to 7, wherein: The cover member (300) is strip-shaped.

9. The battery cell (130) according to any one of claims 1 to 8, wherein: A mechanical connection interface is arranged on the first side (510), the mechanical connection interface being configured to structurally connect the battery cell (130) to a structural element of the vehicle (100).

10. A battery cell stack (120) for an electric vehicle (100), comprising: a plurality of battery cells arranged adjacent to each other along an arrangement direction, wherein at least one battery cell (130) among the plurality of battery cells is a battery cell (130) according to any one of claims 1 to 9, wherein the portion (320) of the cover element (300) extending onto the second side (520) of the battery cell (130) according to any one of claims 1 to 9 contacts an adjacent battery cell, and / or wherein the portion (330) of the cover element (300) extending onto the third side (530) of the battery cell (130) according to any one of claims 1 to 9 contacts an adjacent battery cell.

11. The battery cell stack (120) according to claim 10, in, The plurality of battery cells are compressed along a direction extending parallel to the arrangement direction, wherein the portion (320; 330) of the cover member (300) contacting the adjacent battery cells is subjected to a compressive force.

12. A battery system (110) for an electric vehicle (100), comprising the battery cell stack (120) according to claim 10 or 11.

13. An electric vehicle (100), comprising the battery cell stack (120) according to claim 10 or 11 and / or the battery system (110) according to claim 12.

14. The electric vehicle (100) according to claim 13, wherein: The battery cell stack (120) and / or the battery system (110) are structural components of the vehicle (100).

15. A method for manufacturing a battery cell (130), wherein: The battery cell (130) includes a battery cell body having at least a first side (510) and a second side (520), wherein the second side (520) is arranged adjacent to the first side (510), and a vent valve (140) is arranged on the first side (510) of the battery cell body, the method comprising: Providing the battery cell body, and A cover member (300) is arranged on the battery cell body such that the cover member (300) covers at least a portion of the exhaust valve (140) and extends onto the second side (520).

16. A method for manufacturing a battery cell stack (120), the battery cell stack comprising a plurality of battery cells arranged adjacent to each other along an arrangement direction, the method comprising: providing a plurality of battery cells, the plurality of battery cells comprising at least one battery cell (130) according to any one of claims 1 to 9; as well as The plurality of battery cells are arranged adjacent to each other along the arrangement direction so that a portion (320) of the cover element (300) extending to the second side (520) of the battery cell (130) according to any one of claims 1 to 9 contacts an adjacent battery cell, and / or a portion (330) of the cover element (300) extending to the third side (530) of the battery cell (130) according to any one of claims 1 to 9 contacts an adjacent battery cell.

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