Method for producing a battery cell, a battery cell component, and a battery cell

Abstract

The invention relates to a method for producing a battery cell (1), comprising at least the following steps: a) providing a stack (2) of electrodes, the stack (2) having two mutually opposite end faces (3, 4) and a circumferential surface (5) therebetween; b) providing a winding body (6), which has at least one foil portion (7) and a fastening portion (8); c) wrapping the stack (2) with the winding body (6), at least the circumferential surface (5) being enclosed by the winding body (6); d) arranging a first cover element (9) on a first end face (3); e) producing an overlap (10) between a joining region (11) of the first cover element (9) and the fastening portion (8); f) connecting the fastening portion (8) to the joining region (11) in the region of the overlap (10) by means of a joining element (12) which is made of a plastics material. The invention further relates to a battery cell component (16), comprising at least a stack (2) of electrodes, a winding body (6) and at least one cover element (9, 13), as well as to a battery cell (1).

Description

[0001] Description

[0002] Method for producing a battery cell, a battery cell component and a battery cell

[0003] The invention relates to a method for producing a battery cell, a battery cell component and a battery cell.

[0004] The battery cell component comprises, in particular, a stack of electrodes and a winding body. The stack has two opposing end faces and a peripheral surface between them, wherein the peripheral surface is enclosed by the winding body. The stack comprises, in particular, at least a plurality of electrodes comprising at least one anode and one cathode, which are alternately stacked on top of one another in the stack and each separated from one another by a layer of separator material.

[0005] The at least stacked, and possibly additionally wound or folded, cathodes, anodes, and separators form, in particular, a stack or coil (hereinafter referred to as a stack). Each electrode is connected, in particular, to a conductor extending outward from the stack, so that an electrical current can be drawn from the stack or supplied to the stack. The conductors of the anodes and the conductors of the cathodes are each connected to one another and to power terminals of the battery cell in order to electrically connect the respective electrodes in parallel and connect the battery cell to an electrical circuit. Multiple stacks can also be arranged in the battery cell.

[0006] When using a liquid electrolyte, the electrodes are arranged within the electrolyte. With a solid electrolyte, the electrolyte is integrated into the electrodes or separator material.

[0007] The battery cell is in particular a lithium-containing battery cell, in particular a secondary cell, i.e. a rechargeable battery cell.

[0008] A battery cell is an energy storage device used, for example, in a motor vehicle to store electrical energy. In particular, a motor vehicle, for example, has a traction drive (electric motor) for propelling the motor vehicle, wherein the electric motor can be driven by the electrical energy stored in the battery cell.

[0009] A battery module comprises, in particular, one or a plurality of battery cells that are electrically connected in series or parallel. Individual modules can be electrically connected in series or parallel. A battery arrangement comprises at least one or possibly several modules.

[0010] During battery cell manufacturing, the electrodes are first stacked on top of each other, and then the winding former is wound around this stack. This allows the relative position of the electrodes to be fixed, simplifying handling of the stack during subsequent manufacturing steps.

[0011] There is a continuing need to further simplify the production of battery cells and to tailor them to specific requirements.

[0012] The object of the present invention is to at least partially solve the problems cited with reference to the prior art. In particular, a method for producing a battery cell or a battery cell component, a battery cell component, and a battery cell are to be proposed, which further simplify the production of battery cells.

[0013] A method having the features according to claim 1, a battery cell component having the features according to claim 9, and a battery cell having the features according to claim 10 contribute to achieving these objectives. Advantageous developments are the subject of the dependent claims. The features listed individually in the claims can be combined with one another in a technologically expedient manner and can be supplemented by explanatory facts from the description and / or details from the figures, whereby further embodiments of the invention are demonstrated.

[0014] A method for producing a battery cell or a battery cell component is proposed. The method comprises at least the following steps: a) providing a stack of electrodes, wherein the stack has two opposing end faces and a circumferential surface therebetween; b) providing a winding body having at least one film section and a fastening section; c) wrapping the winding body around the stack, wherein at least the circumferential surface is enclosed by the winding body; d) arranging a first cover element on a first end face; e) creating an overlap between a joining region of the first cover element and the fastening section; f) connecting the fastening section to the joining region in the region of the overlap by a joining element made of a plastic material.

[0015] The above (non-exhaustive) classification of the process steps into a) to f) is primarily intended to serve as a distinction and does not enforce any order and / or dependency. The frequency of the process steps, e.g. during the manufacture of the battery cell or battery cell component, can also vary. It is also possible that process steps overlap one another at least partially. In particular, steps a) and b) are carried out independently of one another. In particular, steps c) to f) are carried out after steps a) and b). In particular, step f) is carried out after step e). In particular, steps e) and f) are carried out after steps c) and d).

[0016] Preferably, step d) is performed before or during step c). In particular, steps e) and f) are then performed at least during step c) and after step d).

[0017] According to step a), in particular, a stack of electrodes is provided. The stack comprises, in particular, at least a plurality of electrodes comprising at least one anode and one cathode, which are arranged alternately on top of one another in the stack and are each separated from one another by a layer of separator material.

[0018] The stack consists of at least stacked, and possibly additionally wound or folded, cathodes, anodes, and separators. Each electrode is connected, in particular, to a conductor extending outward from the stack, so that an electrical current can be drawn from or supplied to the stack. The conductors of the anodes and the conductors of the cathodes are each connected to one another.

[0019] The stack has two opposing end faces and a peripheral surface between them. The stack can, in particular, be cuboid-shaped. However, the stack can also be cylindrical or have a different shape. In particular, the end faces form the smallest side faces of the stack or at least do not form the largest side faces of the stack.

[0020] In particular, the anode conductors are arranged on one end face and the cathode conductors on the other end face.

[0021] According to step b), in particular, a winding body is provided which has at least one film section and one fastening section.

[0022] The winding body serves in particular to fix the position of the individual components of the stack relative to one another, i.e. in particular the position of the electrodes and, if applicable, the separator material.

[0023] The winding body comprises, in particular, a foil section that is designed to be deformable so that it can be used to wrap a body. Thus, during wrapping, the foil section adheres as closely as possible to the contour of the stack to be wrapped.

[0024] The winding body, in particular, has at least one fastening section. This section, in particular, has a greater material thickness than the film section. The material of the film section and the fastening section can be the same or different from each other. In particular, the fastening section is not deformable, or at least less easily deformable, than the film section, and cannot adapt to the shape of the stack.

[0025] The fastening section is applied in particular to a side surface of the stack and serves to align or fix the position of the components of the stack.

[0026] If, for example, the stack is cuboid-shaped and the end faces form, for example, the smallest side faces of the stack, then the at least one fastening section is preferably arranged on the medium-sized side face of the stack.

[0027] The winding body preferably has at least several film sections, each of which adjoins the one fastening section. In particular, the winding body has several film sections and several fastening sections, which are arranged alternately along the (later) winding direction. In particular, the winding body is an overall film-like body that has sections of greater (deformation) stiffness (the at least one fastening section) and lower stiffness (the at least one film section).

[0028] According to step c), the stack is wrapped with the winding body, with at least the peripheral surface being enclosed by the winding body. For this purpose, the fastening section is first arranged on a side surface of the stack, and from there, the film section is wound around the stack.

[0029] After step c), at least the peripheral surface is completely enclosed by the winding body, wherein at the end of the winding process, one end of the winding body is arranged on a part of the winding body already adjacent to the stack and, if necessary, connected thereto, e.g., via an adhesive connection, e.g., by means of an adhesive strip.

[0030] If, for example, the stack is cuboid-shaped and the end faces form, for example, the smallest side faces of the stack, then the at least one fastening section is preferably arranged on the medium-sized side face of the stack and the film section is wound further around the peripheral surface of the stack from there.

[0031] The peripheral surface of the stack includes in particular the two largest side surfaces and the two medium-sized side surfaces.

[0032] In particular, the winding body has a further fastening section, which is then arranged on the other medium-sized side surface. A further film section then extends from there, with at least each of the largest side surfaces then being covered by a respective film section.

[0033] The last film section of the winding body, starting from the (first) fastening section, extends with one end of the winding body in particular back to the (first) fastening section and can be fixed thereto, e.g. via an adhesive connection, e.g. by means of an adhesive strip.

[0034] Step c) is carried out in particular after steps a) and b), which can be performed in parallel or sequentially. Steps a) and b) are in particular independent of one another. According to step d), a first cover element is arranged on a first end face. The first cover element has in particular a joining region that forms an overlap with the fastening section according to step e).

[0035] The first cover element can be arranged on the first end face, in particular before step c). In particular, the conductors of the anodes or cathodes are electrically connected to a power connection arranged on the first cover element.

[0036] Steps c) and d) can also be carried out at least partially in parallel, with the winding of the winding body then taking place successively.

[0037] Step d) can also be carried out (immediately) after step c).

[0038] According to step e), in particular, an overlap is created between a joining region of the first cover element and the fastening section. According to the above explanations, step e) can also be carried out at least partially in parallel with step c) or with steps c) and d). Of course, the overlap can only be created according to step e) if the first cover element has been provided according to step d).

[0039] According to step f), in particular, the fastening section is connected to the joining area in the area of ​​the overlap by a joining element made of a plastic material. According to the above explanations, step f) can also be carried out at least partially in parallel with step c) or with steps c), d), and e). Of course, the overlap according to step e) can only be created if the first cover element has been provided according to step d). Equally, the connection according to step f) can only be created if the first cover element has been provided according to step d) and the overlap has been created according to step e).

[0040] The joining element is in particular a nail or another element, e.g. a tacker element, which is in particular exclusively non-positively connected to at least one of the fastening section and joining area (hereinafter also referred to as the joining partner). The non-positive connection between the joining element designed in this way and the material of the fastening section or joining area is achieved by the friction of the adjoining surfaces of these components. For the arrangement of the joining element, either a bore can be provided or the joining element penetrates into the solid material of the joining partner and displaces it. Alternatively, the joining element can also be designed as a screw, in particular as a self-tapping screw, which, in addition to the non-positive connection, also creates a positive connection with at least one of the joining partners.

[0041] When the joining element is arranged, the joining element penetrates at least the fastening section or the joining area and penetrates the material of the other of the fastening section and the joining area. In particular, the joining element extends beyond the fastening section into the joining area. In particular, after the connection has been created, the joining element extends through a hole in the fastening section.

[0042] In particular, the joining element is not or does not form a material connection.

[0043] In particular, at least the joining area and the fastening section (and preferably also the film section) are made of a plastic material.

[0044] In particular, all joining partners are made of a plastic material.

[0045] In particular, the plastic material is electrically insulating, i.e. not electrically conductive.

[0046] In particular, the stack is electrically insulated from a housing of the battery cell by the winding body and the joining area as well as the at least one joining element.

[0047] In particular, step d) is carried out before or directly after step c) (or in parallel).

[0048] In particular, in a step d1) a second cover element is arranged on the second end face.

[0049] The second cover element also has at least one joining area like the first cover element. However, the second cover element may not have a power connection for connecting to the arresters. In particular, the second cover element is made entirely of a plastic material. The above statements (e.g., also regarding the plastic material) apply accordingly. In particular, steps d) and d1) are carried out before step c) (or concurrently with step c)), and in step e) with each cover element, an overlap is created between a joining area of ​​each cover element and the fastening section.

[0050] In particular, in step f), each cover element is connected to the fastening section via at least one joining element.

[0051] Preferably, the first cover element and the second cover element are arranged on the respective end faces of the stack, and then the (first) fastening section is placed on another side face of the stack. Joining elements can then be arranged (successively or simultaneously) at the resulting overlaps between the (first) fastening section and the respective joining area, so that the (first) fastening section and the cover elements are connected to one another.

[0052] Starting from these connections, the winding body can then be wound around the peripheral surface. In particular, the winding body has a further (second) fastening section, which is arranged on a side surface of the stack opposite the (first) fastening section. A film section extends between these two fastening sections and adheres as closely as possible to the stack's contour. Joining elements can then be arranged (successively or simultaneously) at the resulting overlaps between the (second) fastening section and the respective joining area, so that the further (second) fastening section and the cover elements are connected to one another.

[0053] Starting from these connections with the further (second) fastening section, the winding body can then be further wound around the circumferential surface with another (second) film section.

[0054] The joining elements offer a fast, cost-effective, and robust solution for connecting battery cell components. In particular, they can also compensate for larger tolerances in the stack or winding body, because the joining elements can be flexibly positioned in the overlap area.

[0055] When the (second) film section is applied to the other side surface of the stack, the peripheral surface of the stack is completely enclosed by the winding body, wherein at the end of the wrapping, one end of the winding body (of the second film section) is arranged on a part of the winding body already adjacent to the stack and / or connected thereto, e.g. via an adhesive connection, e.g. by means of an adhesive strip.

[0056] In particular (as described above), after step c), in a step c1), the winding body is fixed to itself, with this fixation being arranged in the region of the circumferential surface. In particular, this fixation is arranged substantially centrally between the two end faces. The fixation preferably comprises several connections, e.g., adhesive connections.

[0057] In particular, after step f) (or when all intended joining elements have been arranged on the stack), in a step g) a housing part of the battery cell is pushed over the second end face onto the wrapped stack and connected to the first cover element arranged on the first end face.

[0058] The housing part is designed, in particular, as a sleeve and has a shape that closely matches the contour of the wrapped stack. In particular, the housing part is made at least partially of a metallic material and is connected to a metallic part of the first cover element, preferably by means of a material bond, e.g., by welding.

[0059] In particular, after step g), in a step h) a housing end part is arranged on the second end face and connected to the housing part to form the battery cell.

[0060] In particular, during or before the connection of the housing end part to the housing part, a power connection arranged on the housing end part is electrically connected to the conductors of the cathodes or the anodes.

[0061] The housing end part is at least partially made of a metallic material and is connected to a metallic part of the housing part, preferably by a material fit, e.g.

[0062] B. welding technology.

[0063] The second cover element serves in particular as a spacer between the stack and the housing end part.

[0064] A battery cell component is further proposed, comprising at least a stack of electrodes, a winding body, and at least one (first) cover element. The winding body has at least one film section and a fastening section. The stack has two opposing end faces and a circumferential surface therebetween, wherein the circumferential surface is enclosed by the winding body. An overlap is formed between a joining region of the (first) cover element and the fastening section. The fastening section is connected to the joining region in the region of the overlap by at least one joining element made of a plastic material.

[0065] In particular, all joining elements that create a connection between a fastening section of the winding body and a joining area of ​​a cover element are made of a plastic material.

[0066] In particular, the battery cell component was manufactured using the described method. In particular, the battery cell component comprises a first cover element and a second cover element.

[0067] A battery cell is further proposed, comprising at least a housing and the described battery cell component arranged therein, wherein at least one side surface of the housing is formed by the (first) cover element. In particular, the opposite side surface of the housing is formed by a housing closure part.

[0068] In particular, a first electrical power connection of the battery cell is formed on the (first) cover element and a second electrical power connection is formed on the housing end part.

[0069] The battery cell housing, in particular, is only plastically deformable. The housing is also referred to as a hard case, and the battery cell, for example, is referred to as a prismatic cell.

[0070] The method for producing the battery cell component or the battery cell can be carried out in particular by a manufacturing facility that comprises, for example, handling devices, joining devices, etc. In particular, the manufacturing facility provided for carrying out the method comprises a data processing system, for example, a control unit, which has means for carrying out the steps of the method and / or has means that are suitably equipped, configured, or programmed to carry out the steps of the method or that carry out the method. The means comprise, for example, a processor and a memory in which instructions to be executed by the processor are stored, as well as data lines or transmission devices that enable a transmission of instructions, measured values, data, or the like between the aforementioned elements.

[0071] The “means” may in particular comprise one or more of the following components: controller(s), microcontroller, data memory, data connection, display devices (such as a display), counter or timer, at least one further sensor, an energy source, etc.

[0072] A computer program is further proposed, comprising instructions which, when the program is executed by a computer, cause the computer to carry out the described method or the steps or individual steps of the described method.

[0073] Furthermore, a computer-readable storage medium is proposed, comprising instructions which, when executed by a computer, cause the computer to carry out the described method or the steps or individual steps of the described method.

[0074] The statements regarding the method are particularly transferable to the battery cell component, the battery cell, the manufacturing facility, the data processing system and / or the computer-implemented method (i.e. the computer program and the computer-readable storage medium) and vice versa.

[0075] The use of indefinite articles ("a," "an," "one," and "another"), particularly in the patent claims and the description reproducing them, is to be understood as such and not as a numeral. Terms or components introduced accordingly are therefore to be understood as appearing at least once and, in particular, as being able to appear multiple times.

[0076] As a precaution, it should be noted that the numerals used here ("first", "second", ...) primarily serve (only) to distinguish between several similar objects, quantities, or processes, and therefore do not necessarily prescribe any interdependence and / or sequence of these objects, quantities, or processes. Should a dependence and / or sequence be required, this is explicitly stated here or will be obvious to the person skilled in the art upon studying the specifically described embodiment. To the extent that a component can occur multiple 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.

[0077] The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be noted that the invention is not intended to be limited by the exemplary embodiments cited. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and combine them with other components and findings from the present description. In particular, it should be noted that the figures, and in particular the proportions shown, are only schematic. They show:

[0078] Fig. 1 : a winding body in a perspective view;

[0079] Fig. 2: Step c) of the process;

[0080] Fig. 3: the arrangement of a lid element on the wrapped stack, in a perspective view;

[0081] Fig. 4: a first embodiment of a joining element, in perspective view;

[0082] Fig. 5: a selection of joining elements of a second embodiment, in perspective view;

[0083] Fig. 6: the arrangement of a joining element according to step f) of the method, in perspective view;

[0084] Fig. 7: a battery cell component immediately before step g) of the method, in perspective view; and

[0085] Fig. 8: a battery cell in perspective view.

[0086] Fig. 1 shows a winding former 6 in a perspective view. The winding former 6 has two foil sections 7 and two fastening sections 8, which are arranged alternately along the (later) winding direction. The winding former 6 serves to fix the position of the individual components of the stack 2 relative to one another, i.e., the position of the electrodes and the separator material. The foil sections 7 are designed to be deformable so that they can be used to wrap the stack 2. During wrapping, the foil sections 7 thus adhere as closely as possible to the contour of the stack 2 to be wrapped (see Fig. 2).

[0087] The fastening sections 8 have a greater material thickness than the film section 7 (see Fig. 2). The material of the film sections 7 and the fastening sections 8 can be the same or different from each other. The fastening sections 8 are not deformable, or at least less easily deformable, than the film sections 7, and cannot adapt to the shape of the stack 2.

[0088] The fastening sections 8 are applied to a side surface of the stack 2 and serve to align or fix the position of the components of the stack 2 (see Fig. 2).

[0089] If the stack 2 is, for example, cuboid-shaped and the end faces 3, 4 form, for example, the smallest side faces of the stack 2 (as shown in the following Figs. 2 to 8), then the fastening sections 8 are preferably arranged on the medium-sized side face of the stack 2.

[0090] The winding body 6 is an overall foil-like body which has sections of greater (deformation stiffness (the fastening sections 8) and lower stiffness (the foil sections 7).

[0091] Fig. 2 shows step c) of the method. Reference is made to the explanations for Fig. 1.

[0092] According to step c), the stack 2 is wrapped with the winding body 6, whereby only the peripheral surface 5 is enclosed by the winding body 6. For this purpose, the (first) fastening section 8 (here at the bottom in Fig. 2) is first arranged on a side surface of the stack 2, and from there, the (first) film section 7 (here to the left of the stack 2) is wrapped around the stack 2.

[0093] The stack 2 is cuboid-shaped and the end faces 2, 3 form the smallest side faces of the stack 2. The (first) fastening section 8 is arranged on the medium-sized side face of the stack 2 and the (first) film section 7 is wound further around the peripheral surface 5 of the stack 2 from there.

[0094] The peripheral surface 5 of the stack 2 comprises the two largest side surfaces and the two medium-sized side surfaces. The winding body 6 has a further (second) fastening section (here at the top in Fig. 2), which is arranged on the other medium-sized side surface. Another (second) film section (here to the right of the stack 2) extends further from this, with each of the largest side surfaces then being covered by a respective film section 7.

[0095] The last film section 7 (right of the stack in Fig. 2) of the winding body 6, starting from the (first) fastening section 8 (bottom in Fig. 2), extends with one end of the winding body 6 back to the (first) fastening section 8 and can be fixed thereto, e.g. via an adhesive connection, e.g. by means of an adhesive strip (see Figs. 3, 6 and 7).

[0096] Fig. 3 shows the arrangement of a first cover element 9 on the wrapped stack 2 in a perspective view. Reference is made to the explanations for Figs. 1 and 2.

[0097] According to step d), a first cover element 9 is arranged on a first end face 3 of the stack 2. The first cover element 9 has a joining region 11 which, according to step e), forms an overlap 10 with the fastening section 8.

[0098] The first cover element 9 is arranged on the first end face 3 after step c). The conductors 18 of the anodes or cathodes are electrically connected to a first power terminal 19 arranged on the first cover element 9.

[0099] Fig. 4 shows a perspective view of a first embodiment of a joining element 12. The joining element 12 is designed like a nail, with lamellae intended to increase the friction between the joining element 12 and the joining partners, i.e., the fastening section s and the joining area 11.

[0100] Fig. 5 shows a perspective view of a selection of joining elements 12 of a second embodiment. Here, the joining element is designed as a type of tacker element (U-shaped and T-shaped). A plurality of tacker elements are shown, which are only separated during the joining operation of the joining element 12.

[0101] Fig. 6 shows the arrangement of a joining element 12 according to step f) of the method, in a perspective view. Reference is made to the explanations for Figs. 1 to 5. According to step f), the fastening section 8 is connected to the joining area 11 in the region of the overlap 10 by a joining element 12 made of a plastic material.

[0102] The joining element 12 is a nail that is or will be connected exclusively by force-locking to at least one of the fastening section 8 and the joining area 11. The force-locking connection between the joining element 12 designed in this way and the material of the fastening section 8 or the joining area 11 is achieved by the friction of the adjoining surfaces of these components. For the arrangement of the joining element 12, either a bore can be provided or the joining element 12 penetrates into the solid material of the fastening section 8 and the joining area 11 and displaces it.

[0103] Alternatively, the joining element 12 can also be designed as a screw, e.g. as a self-tapping screw, which, in addition to the force-locking connection, also creates a form-locking connection with at least one of the fastening section s and the joining area 11.

[0104] When the joining element 12 is arranged, the joining element 12 penetrates the fastening section 8 and penetrates the material of the joining area 11. The joining element 12 thus extends over the fastening section 8 into the joining area 11. After the connection has been created, the joining element 12 extends through a hole in the fastening section 8.

[0105] Fig. 7 shows a perspective view of a battery cell component 16 immediately before step g) of the method. Reference is made to the explanations regarding Figs. 1 to 6.

[0106] In a step d1), a second cover element 13 is arranged on the second end face 4 (only indicated here).

[0107] The second cover element 13 also has a joining region 11 like the first cover element 9. In step e), an overlap 10 is created between a joining region 11 of each cover element 9, 13 and the fastening section s with each cover element 9, 13.

[0108] In step f), each cover element 9, 13 is connected to the respective fastening section 8 via two joining elements 12 each. The first cover element 9 and the second cover element 13 can also be arranged on the respective end faces 3, 4 of the stack 2 before step c), and then the first fastening section 8 can be placed on another side face of the stack 2. Joining elements 12 can then be arranged (successively or simultaneously) on the resulting overlaps 10 between the (first) fastening section 8 and the respective joining area 11, so that the (first) fastening section 8 and the cover elements 9, 13 are connected to one another.

[0109] Starting from these connections, the winding body 6 can then be wound around the circumferential surface 5. For this purpose, the winding body 6 has a further (second) fastening section 8, which is arranged on a side surface of the stack 2 opposite the (first) fastening section 8. A (first) film section 7 extends between these two fastening sections 8 and adheres as closely as possible to the contour of the stack 2. Joining elements 12 can then be arranged (successively or simultaneously) on the overlaps 10 thus created between the (second) fastening section s and the respective joining area 11, so that the further (second) fastening section 8 and the cover elements 9, 13 are connected to one another.

[0110] Starting from these connections with the further (second) fastening section 8, the winding body 6 can then be further wound around the circumferential surface 5 with a further (second) film section 7.

[0111] The joining elements 12 provide a fast, cost-effective, and robust solution for connecting components of a battery cell 1. This allows even larger tolerances of the stack 2 or the winding body 6 to be compensated for, because the joining elements 12 can be flexibly arranged with regard to their positioning in the area of ​​the overlap 10.

[0112] When the (second) film section 7 is applied to the other side surface of the stack 2, the peripheral surface 5 of the stack 2 is completely enclosed by the winding body 6, wherein at the end of the wrapping, one end of the winding body 6 (of the second film section 7) is connected to a part of the winding body 6 already adjacent to the stack 2, here via an adhesive connection, i.e. by means of two adhesive strips 20.

[0113] In a step c1), the winding body 6 is fixed to itself by the adhesive strips 20, with this fixation being arranged in the region of the peripheral surface 5. This fixation is arranged essentially centrally between the two end faces 3, 4. Here, the fixation comprises two adhesive bonds.

[0114] The stack 2 is electrically insulated from a housing 17 of the battery cell 1 by the winding body 6 and the joining area 11 as well as the joining elements 12.

[0115] Fig. 8 shows a perspective view of a battery cell 1. Reference is made to the explanations for Figs. 1 to 7.

[0116] The battery cell 1 comprises a housing 17 and the battery cell component 16 arranged therein, wherein one side surface of the housing 17 is formed by the first cover element 9. The opposite side surface of the housing 17 is formed by a housing end part 15.

[0117] A first electrical power connection 19 of the battery cell 1 is formed on the first cover element 9 and a second electrical power connection (not shown) on the housing end part 15.

[0118] The housing 17 of the battery cell 1 is only plastically deformable. The housing 17 is also referred to as a hard case, and the battery cell 1, for example, is referred to as a prismatic cell.

[0119] After step f) (or when all intended joining elements 12 have been arranged on the stack 2), in a step g) a housing part 14 of the battery cell 1 is pushed over the second end face 4 onto the wrapped stack 2 and connected to the first cover element 9 arranged on the first end face 3.

[0120] The housing part 14 is designed as a sleeve and has a shape that closely matches the contour of the wrapped stack 2. The housing part 14 is at least partially made of a metallic material and is connected to a metallic part of the first cover element 9, preferably by means of a material bond, e.g., by welding.

[0121] After step g), in a step h), a housing end part 15 is arranged on the second end face 4 and connected to the housing part 14 to form the battery cell 1. In particular, during or before the connection of the housing end part 15 to the housing part 14, a second power connection (not shown) arranged on the housing end part 15 is electrically connected to the conductors 18 of the cathodes or the anodes.

[0122] The housing end part 15 is at least partially made of a metallic material and is connected to a metallic part of the housing part 14, preferably in a materially bonded manner, e.g. by welding.

[0123] The second cover element 13 serves as a spacer between the stack 2 and the housing end part 15.

[0124] List of reference symbols

[0125] Battery cell

[0126] Stack first face second face

[0127] circumferential area

[0128] winding body

[0129] Slide section

[0130] Fastening section first cover element overlap joining area joining element second cover element

[0131] Housing part

[0132] Housing end part

[0133] Battery cell component

[0134] Housing

[0135] Arrester first power connection

[0136] Adhesive strips

Claims

Patent claims 1. A method for producing a battery cell (1), comprising at least the following steps: a) providing a stack (2) of electrodes, wherein the stack (2) has two opposing end faces (3, 4) and a peripheral surface (5) therebetween; b) providing a winding body (6) having at least one film section (7) and one fastening section (8); c) wrapping the stack (2) with the winding body (6), wherein at least the peripheral surface (5) is enclosed by the winding body (6); d) arranging a first cover element (9) on a first end face (3); e) creating an overlap (10) between a joining region (11) of the first cover element (9) and the fastening section (8); f) connecting the fastening section (8) to the joining region (11) in the region of the overlap (10) by means of a joining element (12) made of a plastic material.

2. Method according to claim 1, wherein at least the joining region (11) and the fastening section (8) are made of a plastic material.

3. Method according to one of the preceding claims, wherein step d) is carried out before or directly after step c) 4. Method according to one of the preceding claims, wherein in a step d1) a second cover element (13) is arranged on the second end face (4).

5. Method according to claim 4, wherein steps d) and d1) are carried out before step c) and in step e) with each cover element (9, 13) an overlap (10) is produced between a joining region (11) of each cover element (9, 13) and the fastening section (8) and in step f) each cover element (9, 13) is connected to the fastening section (8) via at least one joining element (12) in each case.

6. Method according to one of the preceding claims, wherein after step c) in a step c1) the winding body (6) is fixed to itself, wherein this fixation is arranged in the region of the circumferential surface (5).

7. Method according to one of the preceding claims, wherein after step f) in a step g) a housing part (14) of the battery cell (1) is pushed over the second end face (4) onto the wrapped stack (2) and is connected to the cover element (9) arranged on the first end face (3).

8. Method according to one of the preceding claims, wherein after step g) in a step h) a housing end part (15) is arranged on the second end face (4) and connected to the housing part (14) to form the battery cell (1).

9. A battery cell component (16), comprising at least a stack (2) of electrodes, a winding body (6), and at least one cover element (9, 13); wherein the winding body (6) has at least one film section (7) and one fastening section (8); wherein the stack (2) has two opposing end faces (3, 4) and a peripheral surface (5) therebetween, wherein the peripheral surface (5) is enclosed by the winding body (6); wherein an overlap (10) is formed between a joining region (11) of the cover element (9, 13) and the fastening section (8); wherein the fastening section (8) is connected to the joining region (11) in the region of the overlap (10) by at least one joining element (12) made of a plastic material.

10. Battery cell (1), at least comprising a housing (17) and arranged therein a battery cell component (16) according to claim 9, wherein at least one side surface of the housing (17) is formed by the cover element (9, 13).

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