DE102018210177A1 - Windable electrode - Google Patents

Abstract

The invention relates to a windable electrode (200) for a battery cell (300) with a metallic collector foil (201) and with an at least one-sided electrode coating (202), the electrode coating (202) with the exception of connecting strip surfaces (203) of the metallic collector foil (201 ), which extend transversely to a longitudinal direction (L) of the metallic collector foil (201) over an entire width (B) of the metallic collector foil (201), is applied over the entire surface of the metallic collector foil (201). A method for producing the windable electrode and for producing a battery cell and a battery cell are also described.

Description

The present invention relates to a windable electrode for a battery cell, a method for producing a windable electrode for a battery cell, a method for producing a battery cell and a battery cell.

For the production of battery cells, which are also referred to as cells or galvanic cells, it is known to wind a stack consisting of an anode electrode, a first separator, a cathode electrode and a second separator about an axis parallel to the width direction of the stack. As a result, the effective surface area of the opposite anode electrode and cathode electrode can be increased with compact external dimensions of the battery cell.

Typically, at least one of the two electrodes has a metallic collector foil with an at least one-sided electrode coating. Connection elements for the electrical connection of the electrode to a connection of the battery cell are preferably attached to the metallic collector foil itself. Therefore, an edge area of the metallic collector film is usually left uncoated. For manufacturing reasons, it is customary to leave symmetrical edge areas on the two opposite longitudinal edges of the metallic collector foil uncoated. The electrode edge area that is not required is then removed.

Proceeding from this, the object of the present invention is to provide improved electrodes. In particular, it is an object of the invention to avoid the increased outlay in material and labor associated with the removal of the marginal area that is not required.

This object was achieved with the subject matter of the independent patent claims. Advantageous embodiments of the invention are set out in the claims which refer back to the independent claims.

According to a first aspect, a windable electrode for a battery cell is proposed. The windable electrode comprises a metallic collector film and an at least one-sided electrode coating. With the exception of connecting strip surfaces of the metallic collector foil, which extend transversely to a longitudinal direction of the metallic collector foil over an entire width of the metallic collector foil, the electrode coating is applied essentially over the entire surface of the metallic collector foil.

In contrast to the prior art described at the outset, the connecting strip surfaces of the windable electrode do not extend along the edges of the metallic collector film. This can simplify the coating of the metallic collector foil in a continuous process.

According to a first advantageous embodiment of the windable electrode, the metallic collector foil is a cathode foil and the electrode coating is a cathode electrode coating or the metallic collector foil is an anode foil and the electrode coating is an anode electrode coating.

In other words, both the anode electrode and the cathode electrode of a battery cell can be configured in the manner described above. The advantages associated with the use of the proposed wrap-around electrode film can then be seen twice in the battery cell. In principle, however, it is also conceivable to provide an electrode coating only for the anode electrode or only for the cathode electrode. In particular, it is not excluded to use an uncoated, metallic collector foil as the anode electrode or cathode electrode. This can possibly further simplify the manufacture of the battery cell.

A further advantageous embodiment of the windable electrode provides that the connecting strip surfaces are set up for the attachment, in particular welding, of Alb conductor tabs.

Welding on can allow a permanent connection of the conductor tabs to the metallic collector foil and thus a long service life of a battery cell produced using the windable electrode. Alternatively, it is also conceivable in principle to connect the conductor tabs to the metallic collector foil by soldering or gluing to the connection strip surfaces.

Furthermore, a further development of the windable electrode is proposed as a further advantageous embodiment, in which the spacing or spacings of the connecting strip surfaces are adapted to the geometry of the electrode in the wound state such that the connecting strip surfaces of the electrode in the wound state only on one side of a first level , in which a winding axis of the electrode is arranged.

The disclosed arrangement of the connecting strip surfaces on one side of the plane can make it easier to separate the two different poles of the battery cell. In particular, short circuits can be prevented in this way and the operational safety of one Battery cell manufactured using the windable electrode can be improved.

According to a further advantageous embodiment of the windable electrode, the connecting strip surfaces cut a second plane in the wound state, which is aligned parallel to one or the winding axis of the electrode.

In a cross-sectional view of the windable electrode in the wound state, the connecting strips consequently intersect a straight line. This can simplify the electrical connection of the metallic collector foil on the different connection strip surfaces.

In particular, arrester tabs attached to these connecting strip surfaces can be connected both to one another and to the electrical connection of the battery cell more quickly and therefore more cost-effectively.

Another advantageous embodiment of the windable electrode provides that the second level intersects the first level.

In this way, the separation of the two poles of the battery cell can be realized even more simply with a simplified electrical connection of the two metallic collector foils.

Furthermore, a further development of the windable electrode is proposed as a further advantageous embodiment, in which an adhesion promoter layer is arranged between the electrode coating and the metallic collector foil.

The use of an adhesion promoter layer between the electrode coating and the metallic collector foil can be accompanied by fewer restrictions with regard to the choice of the electrode coating. The adhesive layer can permanently connect the electrode coating to the metallic collector layer. It can also increase high-current load capacity and reduce cell internal resistance. For example, materials can be used for the electrode coating that cannot be connected directly to the metallic collector foil. Such materials can have advantageous electrochemical, chemical and mechanical properties.

According to another advantageous embodiment of the windable electrode, the adhesion promoter layer has a polymer and / or carbon or graphite.

Polymers can be made available inexpensively and are characterized by a long shelf life. Carbon can in particular enable improved electrical conduction from the electrode coating to the metallic collector foil.

According to a second aspect, a method for producing a windable electrode described above is proposed. A metallic collector foil is provided and then an electrode coating material is applied to the metallic collector foil.

In an advantageous embodiment of the method for producing a windable electrode, an adhesion promoter layer is applied to the metallic collector film before the electrode coating material is applied.

The metallic collector foil can be provided as a continuous, metallic collector foil, to which the electrode coating material or the adhesion promoter layer is applied intermittently over the entire width of the metallic collector foil. The collector foil can then be cut to the appropriate length later. Due to the continuous transport of the metallic collector foil and the intermittent coating thereof, the manufacture of the windable electrode can be made more cost-effective. Existing systems, e.g. Coaters and calenders can continue to be used for the new process. The new method can also be designed to be compatible with existing methods for producing a battery (cell) housing, in particular for a hardcase or softpack cell.

With regard to further advantages associated with the method, reference is also made to the above explanations regarding the windable electrode.

A further development of the method for producing a windable electrode provides that the electrode coating material is a self-supporting electrode coating film and / or an electrode coating liquid and / or an electrode coating powder.

The total thickness of the windable electrode can be predetermined more precisely by using an electrode coating film. In particular, the electrode coating film can be compressed before being applied to the metallic collector film, so that a thinner, windable electrode can be obtained in a process-reliable manner. In particular, pre-pressing the electrode layer before applying it to the metallic collector can result in less mechanical stress on the collector film. For given dimensions of the Battery cell allow a larger effective surface and thus a higher capacity of the battery cell.

An electrode coating liquid, in particular an electrode paste or a slurry, can enable the use of conventional liquid coating devices. The electrode coating liquid can, for example, be rolled up, poured on or sprayed on.

It is conceivable to apply an electrode coating powder to the metallic collector foil by means of static electricity. When using electrode coating powder in combination with an adhesion promoter layer, excess electrode coating powder can simply be removed from the regions not wetted by the adhesion promoter layer by blowing off.

According to a further exemplary embodiment of the method for producing a windable electrode, the metallic collector foil, the electrode coating material and the optional adhesion promoter layer are compressed together. Due to the common compression, the total thickness of the windable electrode can be further reduced and, as a result, the capacity of the battery cell can be further increased as described above.

According to a third aspect, a method for producing a battery cell is proposed. An anode electrode is provided. The anode electrode can in particular have been produced using one of the methods described above. A first separator is arranged on the anode electrode coating of the anode electrode. A cathode electrode with the cathode electrode coating is arranged on the first separator. The cathode electrode can also have been produced using one of the methods described above. A second separator is arranged on the cathode electrode and / or on the side facing away from the anode electrode coating of the anode electrode. The stack comprising the anode electrode, the first separator, the cathode electrode and the second separator is then wound around a winding axis arranged perpendicular to the longitudinal direction of the anode electrode and cathode electrode.

According to a first embodiment of the method for producing a battery cell, conductor tabs are attached, in particular welded, to the connecting strip surfaces before winding. Attaching the conductor tabs before winding can be easier than attaching the conductor tabs after winding.

In an alternative exemplary embodiment of the method for producing a battery cell, conductor tabs are attached, in particular welded, to the connecting strip surfaces after winding. Attaching the arrester tabs after winding can simplify the winding of the stack.

Furthermore, a development of the method for producing a battery cell provides that the distances between the connecting strip surfaces, the thickness of the anode electrode, the first separator, the cathode electrode and the second separator, and the winding geometry are adapted such that the connecting strip surfaces of the anode electrode are on one side of a plane , in which the winding axis is located, and the connecting strip surfaces of the cathode electrode are arranged on the opposite side. Alternatively or additionally, the conductor tabs can be arranged one above the other, both in the case of an electrode coil and in an electrode stack, in such a way that a multi-tab design is achieved.

In this way, the electrical contacts assigned to the anode can be cleanly separated from the electrical contacts assigned to the cathode and short circuits can be avoided. This can improve the operational safety of the battery cells.

According to a fourth aspect, a battery cell is proposed. The battery cell can in particular be produced using one of the methods described above. The battery cell has a stack wound around a winding axis. The stack comprises an anode electrode, a first separator which is arranged on the anode electrode coating of the anode electrode, a cathode electrode which is arranged with the cathode electrode coating on the first separator, and a second separator. The anode electrode and / or the cathode electrode can have been produced using one of the methods mentioned above. The second separator can be arranged on the cathode electrode or on the side facing away from the anode electrode coating of the anode electrode. The connecting strip surfaces of the anode electrode are arranged on one side of a plane in which the winding axis lies, and the connecting strip surfaces of the cathode electrode are arranged on the opposite side. The advantages associated with the proposed battery cell of a higher energy density and a reduced risk of short circuit have been explained above.

In one configuration of the battery cell, the connecting strip surfaces cut a second plane in the wound state, which is aligned parallel to the winding axis of the electrode, and wherein the second plane intersects the first plane. This can simplify the electrical connection of the metallic collector foils to the connections of the battery cell.

An advantageous embodiment of the battery cell provides that the wound stack has an essentially circular or an essentially polygonal cross section perpendicular to the winding axis. In the case of an essentially circular cross section, the curvature of the stack changes slowly and continuously, which can prevent the stack from buckling during winding and a denser winding with an associated higher energy density based on the cross-sectional area of the stack. In contrast, the provision of a stack with an essentially polygonal cross section can simplify the provision of batteries which comprise a multiplicity of battery cells. In particular, stacks and thus battery cells with a rectangular, triangular or hexagonal cross section can be packed particularly densely, so that a given volume, e.g. in an electric vehicle, can be optimally used.

A battery can include one or more of the proposed battery cells, which may be electrically connected to one another. The battery can be used in particular as an energy store in a motor vehicle. A passenger car or lorry, which has one of the batteries disclosed here, can have a greater range than conventional electric vehicles. The battery cells described can be primary cells, but in particular also rechargeable secondary cells (accumulator cells).

• 1 eine beispielhafte Vorrichtung zur Herstellung einer wickelbaren Elektrode;
• 2 einen Abschnitt der in 1 gezeigten Vorrichtung;
• 3 beispielhafte Zwischen- und Endprodukte bei der Ausführung eines Verfahrens zur Herstellung einer wickelbaren Elektrode mit der in den 1 und 2 gezeigten Vorrichtung;
• 4 einen Stapel mit wickelbaren Elektroden gemäß 3 in einem Längsschnitt entlang einer Schnittachse X3-X3;
• 5 Stapel nach 4 im Querschnitt entlang der Schnittachse X2-X2;
• 6 eine beispielhafte Batteriezelle mit einem gewickelten Stapel nach 4 und 5;
• 7 die Batteriezelle nach 6 entlang einer Schnittachse X3-X3;
• 8 ein Ausführungsbeispiel einer Vorrichtung zur Herstellung einer wickelbaren Elektrode gemäß dem ersten Aspekt;
• 9 ein alternatives Ausführungsbeispiel einer Vorrichtung zur Herstellung einer wickelbaren Elektrode gemäß dem ersten Aspekt;
• 10 ein erstes Ausführungsbeispiel einer wickelbaren Elektrode gemäß dem ersten Aspekt in der Aufsicht;
• 11 ein zweites Ausführungsbeispiel einer wickelbare Elektrode gemäß dem ersten Aspekt in der Aufsicht;
• 12 einen Stapel mit wickelbaren Elektroden gemäß dem in 10 gezeigten Ausführungsbeispiel oder gemäß dem in 11 gezeigten Ausführungsbeispiel im Längsschnitt;
• 13 den in der 12 gezeigten Stapel im gewickelten Zustand; und
• 14 ein Ausführungsbeispiel einer Batteriezelle nach dem vierten Aspekt mit einem Stapel gemäß 13.

Embodiments and advantages of the invention are explained in more detail with the aid of the following figures. At least partially shows schematically:

• 1 an exemplary device for producing a windable electrode;
• 2 a section of the in 1 shown device;
• 3 exemplary intermediate and end products in the execution of a method for producing a windable electrode with the in the 1 and 2 shown device;
• 4 according to a stack with windable electrodes 3 in a longitudinal section along a cutting axis X3 - X3 ;
• 5 Stack after 4 in cross section along the cutting axis X2 - X2 ;
• 6 an exemplary battery cell with a wound stack after 4 and 5 ;
• 7 the battery cell after 6 along an intersection axis X3 - X3 ;
• 8th an embodiment of a device for producing a windable electrode according to the first aspect;
• 9 an alternative embodiment of a device for producing a windable electrode according to the first aspect;
• 10 a first embodiment of a windable electrode according to the first aspect in plan;
• 11 a second embodiment of a windable electrode according to the first aspect in plan;
• 12 a stack with windable electrodes according to the in 10 shown embodiment or according to the in 11 embodiment shown in longitudinal section;
• 13 the one in the 12 shown stack in the wound state; and
• 14 an embodiment of a battery cell according to the fourth aspect with a stack according to 13 ,

Based on 1 , which schematically shows a first device for producing a windable electrode, a method for producing a windable electrode is explained below, the intermediate and end products of which 3 are shown.

First, a metallic collector sheet 101 provided and an electrode coating on this 102 applied. In the 1 is a nozzle for this 110 for applying the electrode coating 102 indicated.

Like in the 3a is shown, the electrode coating 102 not across the entire width B the metallic collector foil 101 applied, but it remains essentially symmetrical on both sides of an edge of the metallic collector film 101 uncovered.

After applying the electrode coating 102 this is together with the metallic collector foil 101 by means of two rollers 121 and 122 compacted. The compressed electrode then has a compressed metallic collector foil 101v and a densified electrode coating 102v on. Because the electrode coating 102 the metallic collector foil 101 not covered over the full width as it is in the 2 is shown, the pressure that the rollers 121 and 122 on exercise the electrode, vary across the width. This can lead to the fact that, particularly in the transition area between the covered and uncovered area of the metallic collector foil 101v Form ripples as in the 3b and 3c is indicated. After compacting, the electrode can be trimmed in such a way that an uncovered edge of the metallic collector foil is only on one side 101v remains as it is in 3c is shown.

The 4 shows in a longitudinal cross section a stack for producing a battery along a cutting axis X1 - X1 the 3c ,

The stack preferably has an anode foil 101 , an anode electrode coating 102 , a first separator 106 , a cathode electrode coating 102k , a cathode foil 102k and a second separator 107 on.

The 5 shows the stack 4 again in cross section according to the in 4 drawn cutting axis X2 - X2 , It is easy to see that the anode foil 101 to the right and the cathode foil 101k protrudes to the left from the stack.

In the 6 is the wound stack from the side and in the 7 from the front along the in the 6 drawn cutting axis X3 - X3 schematically in a cuboid housing 108 shown. The protruding sections of the anode foil 101 and the cathode foil 101k are each with battery cell contacts 150a and 150k connected. Preferably form the stack with the housing 108 and the battery cell contacts 150a and 150k a battery cell.

Based on 8th , which schematically shows an exemplary embodiment of a device for producing a windable electrode, a method for producing a windable electrode according to the second aspect for a battery cell with a metallic collector foil is described below 201 and an at least one-sided electrode coating 202 explained. The electrode coating 202 with the exception of connecting strip surfaces 203 the metallic collector foil 201 which are transverse to a longitudinal direction of the metallic collector foil 201 over an entire width of the metallic collector foil 201 extend, in this exemplary embodiment of the method preferably essentially over the entire surface of the metallic collector foil 201 applied.

The metallic collector foil 201 can in the example shown as a continuous metallic collector foil 201 be provided and will be in the 8th transported from left to right.

Using a nozzle 211 can be an electrode coating liquid 2021 intermittently on the metallic collector foil 201 be applied. In this case, coating with the electrode coating liquid can take place at predetermined intervals 2021 be disregarded so that a connecting strip surface 203 can remain uncoated.

After the electrode coating liquid has hardened 202l The electrode coating can be accelerated by heat treatment, UV radiation and / or a hardener 202 together with the metallic collector foil 201 between two rollers 221 and 222 be condensed, similar to how it is in relation to 1 has been described.

In the 10 A first exemplary embodiment of an electrode according to the invention is shown, which preferably corresponds to that with reference to FIG 8th described manufacturing process was produced. The electrode therefore has a compressed metallic collector foil 201v and a densified electrode coating 202V on.

Due to the essentially full-surface coating of the collector film 201v can ripples, as in the case of the 1 to 3 described methods can occur, preferably reduced or even completely avoided. Waviness could lead to mechanical defects in the metallic collector foil during further processing. The essentially full-surface coating of the metallic collector foil can enable a higher compression of the electrode, which is not the result of the method according to 1 to 3 occurring ripples is limited. Due to the higher compression of the electrodes, the energy density of the battery cells can be increased.

Based on 9 , which schematically shows an alternative device for producing a windable electrode, a further method according to the second aspect for producing a windable electrode for a battery cell is shown below.

First, an adhesion promoter layer is preferred 205 by means of a nozzle 212 intermittently on the metallic collector foil 201 applied. The adhesion promoter layer can in particular have a polymer and / or carbon.

A self-supporting electrode coating film is further preferred 202f on a roll 232 provided. The self-supporting electrode coating film 202f preferably adheres only to those with the adhesion promoter layer 205 provided areas. On the other areas, ie the connecting area areas, it can be, for example, by Blow off can be removed. The role is also conceivable 232 to be equipped with appropriately cut electrode coating film sections that automatically apply to the appropriate area of the adhesion promoter layer 205 be applied.

After applying the electrode coating film 202f can use the metallic collector foil 201 who have favourited Bonding Layer 205 and the electrode coating sheet 202f together by means of the rollers 221 and 222 be compressed. As an alternative to using a self-supporting electrode coating film 202f is also the combination of using an adhesion promoter layer with an electrode coating liquid 202l how it is in terms of 8th has been described, or an electrode coating powder is conceivable.

In the 11 is a second embodiment of a windable electrode 200 shown, which was preferably produced with a manufacturing method, as it is in relation to the 8th or 9 was explained.

Except for the connecting strip surfaces 203 the metallic collector foil is preferably full-surface with the electrode coating 202 covered. The connecting strip surfaces 203 preferably extend transversely to the longitudinal direction L the metallic collector foil over its entire width B , The connecting strip surfaces are further 203 for attaching, in particular welding, arrester tabs 204 set up. The connecting strip surfaces preferably have a predefined distance A on.

12 shows a further stack for producing a battery cell with a windable electrode according to 10 or 11 ,

The stack includes an anode electrode 200a , a first separator 206 , a cathode electrode 200k and a second separator 207 ,

The anode electrode 200a and the cathode electrode are preferably arranged such that the anode electrode coating 202a and the cathode electrode coating 202k face each other and only through the first separator 206 are separated.

The distance A1 the connecting strip surfaces of the anode foil 201 can differ from the distance A2 the connecting strip surfaces of the cathode foil 201k differ.

In addition, the connecting strip surfaces of the anode foil lie 201 and the cathode foil 201k preferably not opposite.

In the 13 is the in 12 shown stack shown in the wound state.

In the exemplary embodiment shown, the stack is wound such that the cathode electrode 200kw is on the inside and the anode electrode 200AW is outside. Accordingly, the dimensions of the cathode electrode 200k and the anode electrode 200a in in 12 shown stack preferably chosen so that the anode electrode 200a is longer than the cathode electrode 200k ,

The stack is preferably wound around a winding axis, which is between the two innermost, immediately opposite sections of the second separator 207 is arranged.

The connecting strip surfaces 203a the anode electrode 200AW are preferably on one side of a plane E1 , in which the winding axis lies, namely the (right) side S1 arranged. In contrast are the connecting strip surfaces 200kw the cathode electrode 200kw preferably on the opposite (left) side S2 arranged. The connecting strip surfaces also cut 203a and 203k preferably a second level in the wound state E2 , which is aligned parallel to the winding axis and preferably intersects the first plane.

14 shows an embodiment of a battery cell 300 according to the fourth aspect with a housing 208 and a stack according to the 12 and 13 ,

The housing 208 the battery cell 300 can be made of aluminum or stainless steel, for example. The use of aluminum can have weight advantages. A housing 208 stainless steel can be easier to manufacture, for example by welding, and / or offer greater security against mechanical stress on the battery cell.

Compared to that in terms of 6 and 7 The example of a battery cell described can have a larger volume within the housing 208 can be used for the stack, since the battery cell contacts are very easy with the conductor tabs 204 can be connected.

In addition, there is no need for the laterally projecting edges of the metallic collector foils, so that a larger proportion of the volume inside the housing can be used for the active, opposing surface areas of the anode electrode and cathode electrode. In this way, the energy density of the battery cell can be increased further. In addition, the current capacity of the battery cell described can be increased by the improved separation of the cathode connections and anode connections.

The exemplary embodiments of the battery cell according to the invention described above can in particular be implemented as a lithium-ion cell.

LIST OF REFERENCE NUMBERS

A

Distance of the connecting strip surfaces

A1

Distance of the connecting strip surfaces

A2

Distance of the connecting strip surfaces

L

Longitudinal direction of the electrode

B

Width of the electrode

E1

first floor

E2

second level

101

metallic collector foil

101v

compressed metallic collector foil

101

anode foil

101k

cathode foil

102

electrode coating

102

Anode electrode coating

102k

Cathode electrode coating

102v

compressed electrode coating

106

first separator

107

second separator

108

casing

110

jet 110

121

roller

122

roller

150a

Battery cells Contact

150k

Battery cells Contact

200

windable electrode

200a

anode electrode

200k

cathode electrode

200AW

Anode electrode in the wound state

201

metallic collector foil

201

anode foil

201k

cathode foil

201v

compressed, metallic collector foil

202

electrode coating

202a

Anode electrode coating

202k

Cathode electrode coating

202f

Electrode coating film

2021

Electrode coating liquid

202V

compacted, electrode coating

203

Connecting strip surfaces

203aw

Connecting strip surfaces

203kw

Connecting strip surfaces

204

output lugs

205

Bonding layer

206

first separator

207

second separator

300

battery cell

Claims (19)

Windable electrode (200) for a battery cell (300) with a metallic collector foil (201), and with an at least one-sided electrode coating (202), characterized in that the electrode coating (202) with the exception of connecting strip surfaces (203) of the metallic collector foil (201 ), which extend transversely to a longitudinal direction (L) of the metallic collector foil (201) over an entire width (B) of the metallic collector foil (201), is applied essentially over the entire surface of the metallic collector foil (201). Windable electrode (200) after Claim 1 , where the windable electrode is a cathode electrode (200k), the metallic collector foil (201) is a cathode foil (201k) and the electrode coating is a cathode electrode coating (202k), or wherein the wound electrode is an anode electrode (200a), the metallic collector foil (201) is an anode foil ( 201a) and the electrode coating (202) is an anode electrode coating (202a). Windable electrode (200) according to one of the Claims 1 or 2 , wherein the connecting strip surfaces (203) are arranged for the attachment, in particular welding, of conductor tabs (204). Windable electrode (200) according to one of the Claims 1 to 3 , the distance or distances (A) the connecting strip surfaces (203) are adapted to the geometry of the electrode in the wound state (200aw) in such a way that the connecting strip surfaces (203) of the electrode in the wound state only on one side (S1) of a first plane (E1), in which a winding axis of the electrode lies. Windable electrode (200) according to one of the Claims 1 to 4 , wherein the connecting strip surfaces in the wound state intersect a second plane (E2) which is aligned parallel to one or the winding axis of the electrode. Windable electrode (200) after Claim 5 , wherein the second level (E2) intersects the first level (E1). Windable electrode (200) according to one of the Claims 1 to 6 , an adhesion promoter layer (205) being arranged between the electrode coating (202) and the metallic collector foil (201). Windable electrode (200) after Claim 7 , wherein the adhesion promoter layer comprises a polymer and / or carbon. Method for producing a windable electrode (200) according to one of the Claims 1 to 8th The method comprises: providing a metallic collector foil (201), then applying an electrode coating material (202) to the metallic collector foil (201). Method for producing a windable electrode (200) according to Claim 9 , wherein before the application of the electrode coating material (202) an adhesion promoter layer (205) is applied to the metallic collector foil (201). Method for producing a windable electrode (200) according to one of the Claims 9 or 10 , wherein the electrode coating material (202) is a self-supporting electrode coating film (202f) and / or an electrode coating liquid (2021) and / or an electrode coating powder. Method for producing a windable electrode (200) according to one of the Claims 9 to 11 , wherein the metallic collector foil (201), the electrode coating material (202) and the optional adhesion promoter layer (205) are compressed together. Method for producing a battery cell (300), providing an anode electrode (200a) according to Claim 2 , in particular produced with a method according to one of the Claims 9 to 12 , Arranging a first separator (206) on the anode electrode coating (202a) of the anode electrode (200a), arranging a cathode electrode (200k) after Claim 2 with the cathode electrode coating (202k) on the first separator (206), arranging a second separator (207) on the cathode electrode (200k) and / or on the side facing away from the anode electrode coating (202a) of the anode electrode (200a), winding the stack comprising the Anode electrode (200a), the first separator (206), the cathode electrode (200k) and the second separator (207) around a winding axis arranged perpendicular to the longitudinal direction (L) of the anode electrode (200a) and cathode electrode (200k). Method for producing a battery cell (300) according to Claim 13 comprising attaching, in particular welding, of conductor tabs (204) to the connecting strip surfaces (203) before winding. Method for producing a battery cell (300) according to one of the Claims 13 or 14 , comprising attaching, in particular welding, of conductor tabs (204) to the connecting strip surfaces (203) after winding. Method for producing a battery cell (300) according to one of the Claims 13 to 15 , the distances between the connecting strip surfaces (203), the thickness of the anode electrode (200a), the first separator (206), the cathode electrode (200k) and the second separator (207) and the winding geometry being adapted such that the connecting strip surfaces (203) the anode electrode (200a) on one side (S1) of a plane (E) in which the winding axis lies, and the connecting strip surfaces (203) of the cathode electrode (200k) are arranged on the opposite side (S2). Battery cell (300), in particular produced using a method according to one of the Claims 13 to 16 , The battery cell (300) having a stack wound around a winding axis, the stack following an anode electrode (200a) Claim 2 , in particular produced with a method according to one of the Claims 8 to 11 , a first separator (206), which is arranged on the anode electrode coating (202a) of the anode electrode (200a), after a cathode electrode (200k) Claim 2 , in particular produced with a method according to one of the Claims 8 to 11 which with the cathode electrode coating (202k) is arranged on the first separator (206), and a second separator (207) which is arranged on the cathode electrode (200k) and / or on the side facing away from the anode electrode coating (202a) of the anode electrode (200a), The connecting strip surfaces (203) of the anode electrode (200a) are arranged on one side (S1) of a plane (E) in which the winding axis lies, and the connecting strip surfaces (203) of the cathode electrode (200k) on the opposite side (S2) are arranged. Battery cell (300) after Claim 17 , wherein the connecting strip surfaces in the wound state intersect a second plane (E2) which is aligned parallel to the winding axis of the electrode, the second plane (E2) intersecting the first plane. Battery cell (300) after Claim 17 or 18 , wherein the wound stack has a substantially circular or a substantially polygonal cross section perpendicular to the winding axis.

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