Method for laminating a cylindrical energy-storage cell

Abstract

The invention relates to a method for laminating a cylindrical energy-storage cell, comprising the steps of: providing an electrode layer sequence (2) comprising at least an anode, a cathode and a separator; laminating a core region (2) of the electrode layer sequence (1) by connecting a laminate to the core region (2) of the electrode layer sequence (1) under the pressure and the temperature that are produced by a lamination rod (200); and winding the electrode layer sequence (1) to form an electrode coil (120), so that the core region (2) of the electrode layer sequence (1) forms the coil core (190) of the electrode coil (120).

Description

[0001] METHOD FOR LAMINATING A CYLINDRICAL ENERGY STORAGE CELL

[0002] The following description relates to a method for laminating a cylindrical energy storage cell and to a cylindrical energy storage cell. In particular, the description relates to electrochemical energy storage cells having a cylindrical form factor and manufactured using the method for laminating a cylindrical energy storage cell.

[0003] State of the art

[0004] Modern electrochemical storage cells (also called battery cells or cells for short) are subject to increasingly stringent requirements regarding their space-to-performance ratio. Cylindrical battery cells (also called round cells) are one possible design for electrochemical energy storage cells that are used in a wide variety of applications such as electric vehicles, electronic devices, energy storage systems, or emergency power supplies. Round cells have the advantage of a high energy-to-density ratio compared to other battery cell formats, as they offer better heat dissipation and greater mechanical stability. They also often have low resistance and are therefore increasingly used for applications requiring a high discharge rate. Round cells comprise an electrolyte, a cathode, an anode, and a separator, which are wound together into a spiral to form an electrode coil, also called a jelly roll.The electrodes are designed, for example, as metal foils. The electrode coil is then placed in a cylindrical housing made of metal or plastic, which can serve as a current collector.

[0005] The lamination of the electrode coil is an important step in the production of battery cells in the round cell format (cylindrical form factor), as it compresses the structure of the electrode coil and ensures that the cell components are firmly connected to one another. Lamination compresses the spiral shape of the electrode coil and, with the help of high-temperature and pressure treatment, creates a stronger and more stable structure. The goal of lamination is to bond the individual layers of the electrode coil into a homogeneous unit (interface) and to ensure that the active material mix of the electrode coil is effectively electrically conductive. This can be crucial for producing a reliable and high-performance battery. To ensure the most uniform lamination possible, precise control of temperature, pressure, time, and arrangement of the components is usually necessary.

[0006] The electrode coil is wound around a central winding axis. The areas of the electrodes that are located in the turns closest to the winding axis are referred to below as the winding core. Lamination is particularly critical in the winding core of the electrode coil, as this area has the highest energy density and is also highly sensitive to external interference. Faulty lamination at this point can lead to problems such as increased internal resistance, overheating, or even short circuits. Precise knowledge of the behavior of the components during lamination is crucial to ensure high production quality and battery performance. This includes, for example, optimizing the material composition, lamination temperature and pressure, as well as the thickness and arrangement of the electrodes.Another factor that can be considered during lamination is the alignment of the electrodes within the electrode coil. Incorrect alignment can lead to inhomogeneities in the material mix and thus impair the battery cell's performance. Precise control of the lamination process, along with high-precision electrode positioning, helps optimize electrode alignment and ensure a homogeneous structure of the electrode coil.

[0007] The known prior art involves the use of an axial electrode winding core to achieve a homogeneous electrode surface in the core region and the use of a separator coated with a binder layer, such as MCS or MFS, to achieve a homogeneous interface. Lamination of the electrode winding in the core region typically requires high pressure and high temperatures. Since the core region can hardly withstand pressure without a solid electrode winding core, effective lamination without such an electrode winding core is challenging.

[0008] It is an object to provide a method for laminating a cylindrical energy storage cell that allows for simpler and more homogeneous lamination of a winding core. Furthermore, an advantageously laminated cylindrical energy storage cell is to be provided. These objects are achieved by a method for laminating a cylindrical energy storage cell and a cylindrical energy storage cell having the features of the independent and subordinate patent claims. Advantageous embodiments and developments of the invention are set forth in the dependent claims.

[0009] Summary

[0010] It is understood below that each feature described with respect to any embodiment may be used alone or in combination with other features described herein, and may be used in combination with one or more features of any other embodiment, or in any combination of any other embodiment, unless explicitly described as an alternative. Furthermore, equivalents and modifications not described below may be used without departing from the scope of the claimed subject matter.

[0011] The following proposes a method for laminating a cylindrical energy storage cell. In one embodiment, an electrode layer sequence is provided. The electrode layer sequence comprises at least one anode, one cathode, and one separator. Furthermore, a core region of the electrode layer sequence is laminated by bonding a laminate to the core region of the electrode layer sequence under the pressure and temperature generated or mediated by a laminating rod. The electrode layer sequence is wound into an electrode coil, also called a jelly roll, so that the core region of the electrode layer sequence forms the winding core of the electrode coil.

[0012] A battery cell, for example, is an accumulator here and in the following. A battery cell is thus, for example, a single rechargeable storage element for electrical energy. An electrode coil is generally a wound electrode layer sequence with at least one electrode layer. For example, such an electrode coil has a cylindrical shape and can also be referred to as a "jelly roll." For use in an electrode coil, for example, several electrode and separator layers are stacked vertically to form a layer sequence. Cylindrical energy storage cells, also called round cells, comprise an electrolyte, a cathode, an anode, and a separator, or several of these components. The electrodes are usually designed as layers, for example, as metal foils with an active material.The electrode coil can then be placed in a cylindrical housing made of metal or plastic, which serves, for example, as a current collector. The improved concept proposed here can be used for different battery cell types or cell chemistries, for example, lithium-ion or sodium-ion cells.

[0013] The electrode layer is, for example, formed with or formed from an active electrode material. Here and in the following, the term "anode" refers to a negative electrode and the term "cathode" refers to a positive electrode of the battery cell. For example, the electrode layer is formed with or formed from an active anode material. In this case, the electrode layer is an anode layer of the battery cell. Furthermore, for example, an electrode layer is formed with or formed from an active cathode material. In this case, the electrode layer is a cathode layer of the battery cell.

[0014] The core region refers to the area of ​​the electrode layer sequence that, when wound up, forms the winding core of the electrode coil. The winding core comprises, for example, one or more inner turns of the electrode coil. From another perspective, the winding core comprises, for example, the first turns that arise when the electrode layer sequence is wound up. The number of turns assigned to the winding core depends on the specific case. For example, the first five, ten, or fifteen turns can be assigned to the winding core. The exact number is not restrictive and can be determined by the design and the desired properties of the cell. The distinction between core region and winding core in the following is intended to take into account the fact that lamination can take place before or after winding.The term “core region” refers to the electrode layer sequence, regardless of whether it is wound to form the electrode coil. The pressure referred to here is exerted on the core region and refers to the corresponding region of the electrode layer sequence, regardless of whether it is wound to form the electrode coil. The term “winding core” refers to the electrode coil formed by winding the electrode layer sequence along a central axis. The core region can form the outer surface of an axial cavity in the electrode coil or extend over several internal turns of the electrode coil. The laminate can be applied to the laminating rod or, alternatively or additionally, applied to a partial surface or to the entire surface of the electrode layer sequence, for example the core region. Thin polymer films or porous materials such as nonwovens can be used as the laminate.The laminate can also be used as a separator between the electrodes, meaning the separator and laminate can be identical or complement each other. Among the polymer films, polyolefins such as polyethylene (PE) and polypropylene (PP) are possible examples, but polyamide (PA), polyacetals (POM), and polyvinylidene fluoride (PVDF) can also be used. When used as a separator, it is advantageous if the materials used are highly porous, allowing ions to move as freely as possible, while at the same time offering good mechanical stability and chemical resistance. Oxide-based ceramic separators, including aluminum oxide (Al2O3) and zirconium oxide (ZrO2), as well as synthetic polymer coatings, such as PVDF, can also be used. The laminate plays an important role in the performance and safety of cylindrical cells.It protects the electrodes from short circuits, supports ion transport, ensures mechanical stability and heat dissipation, and helps prevent capacity losses.

[0015] The electrode coil, for example, comprises opposing pairs of anodes and cathodes separated by the separator. This arrangement can be achieved in various ways. One aspect is that a basic electrochemical unit consisting of anode, cathode, and separator is in direct mechanical contact, and this contact can be maintained. This can be achieved by external forces such as tensile forces, air pressure, or compression forces. Lamination can create a permanent bond between the basic electrochemical unit. During lamination, the electrodes and separators are fused together with a laminate (e.g., a polymer). Lamination has the advantage that the electrodes are positioned in a non-slip manner, eliminating this potential source of error for subsequent process steps.

[0016] The improved concept presented here is based in particular on the considerations outlined below. After the electrode layer sequence has been wound into the electrode coil, a winding mandrel is typically removed from the coil, leaving a cylindrical central cavity in the core area. The method proposed here aims, for example, at improved lamination of the electrode coil in the core area when the electrode coil has the described cavity (jelly-roll core). Compared to alternative methods for laminating the electrode coil in the core area, the proposed method does not require high pressure.

[0017] The proposed process offers an effective and cost-effective way to achieve a homogeneous interface in the electrode winding. The improved concept makes a valuable contribution to optimizing the performance and safety of cylindrical energy storage cells, such as lithium-ion batteries, by achieving a more homogeneous interface in the core area without the use of a rigid jelly-roll core. The proposed process opens up new possibilities for the production of cylindrical energy storage cells with higher energy density and longer lifetimes, which can be of great importance to both the manufacturer and the end user.

[0018] The improved concept allows for targeted lamination to avoid the use of an electrode winding core (or jelly-roll core), thus saving weight and costs. The cylindrical energy storage cell can thus be manufactured without or without an axial winding core. A winding core can act as an axis through the central cavity and fill this cavity in the core area. However, this also has several disadvantages, such as an increase in cell weight, a decrease in volume efficiency, and a concomitant increase in costs. Furthermore, the use of an overly soft winding core can, in some cases, lead to disruptive effects, such as lithium plating. Overall, the lamination of the electrode winding can contribute significantly to the performance of cylindrical energy storage cells, such as lithium-ion batteries, and can therefore be an important factor in the production of high-quality battery cells.

[0019] According to one embodiment, the core region of the electrode layer sequence is laminated in parallel with or before the electrode layer sequence is wound into an electrode coil. Lamination can take place at different times or even be performed multiple times. For example, the electrode layer sequence can already be provided with the laminate, and lamination can take place before winding into the electrode coil.

[0020] According to one embodiment, the core region of the electrode layer sequence is laminated by the laminating rod applying the pressure and temperature required for lamination to the core region through local pressing and / or rolling. Lamination can be performed directly on the electrode layer sequence by the laminating rod laminating the core region before winding it into the electrode coil. Lamination is mediated by the laminating rod, which generates the pressure and temperature and applies them to the core region.

[0021] According to one embodiment, the core region of the electrode layer sequence is laminated after the electrode layer sequence has been wound into an electrode coil. Alternatively, or additionally, the lamination takes place after the electrode layer sequence has been wound into an electrode coil. In this case, a solid electrode coil core (or jelly-roll core) can be omitted.

[0022] According to one embodiment, the electrode layer sequence is wound around the laminating rod, and the laminating rod is removed from the electrode coil after winding. The laminating rod can be removed from the electrode coil after lamination, so that an axial cavity is formed. According to one embodiment, the electrode layer sequence is wound to form the electrode coil. The laminating rod is then inserted into an axial cavity that has formed in the electrode coil as a result of winding, for example, when a winding mandrel has been removed from the electrode coil. The laminating rod can be removed from the electrode coil after lamination, so that the axial cavity is formed. The axial cavity in the embodiments described here does not have to be provided with a fixed electrode coil core, so that weight and costs can be saved while simultaneously achieving a homogeneous interface in the core area.

[0023] According to one embodiment, the laminating rod is inserted into the winding core. The laminating rod is shaped such that, due to the shape of the laminating rod, the pressure is applied locally to the core region of the electrode layer sequence. The laminating rod can be inserted into the central axis (or the axial cavity) of the electrode coil for lamination. The shape of the rod is a factor that determines the locations and strength of the pressure exerted by the rod. For example, the laminating rod can be conical or have a bulge. The laminating rod thus has regions of different thicknesses or diameters. The diameters can be selected such that, when the rod is inserted into the axial cavity of the electrode coil, they exert the pressure for lamination on the core region of the electrode layer sequence. Furthermore, due to the shape of the laminating rod, the temperature can also be applied locally.According to one embodiment, the laminating rod comprises an electrically conductive material. An induction device is configured to generate an alternating magnetic field using a coil and low-frequency, medium-frequency, or high-frequency alternating current, which induces eddy currents in the laminating rod. The electrically conductive material can be heated as a result of eddy current losses generated in the rod.

[0024] According to one embodiment, the laminating rod comprises a heating element. The laminating rod can be heated using electrical energy and then transfer heat directly to the core region of the electrode layer sequence, thereby establishing the temperature for lamination.

[0025] According to one embodiment, the laminate is applied to the core region of the electrode layer sequence before inserting the laminating rod and / or the laminate is applied to the laminating rod. The laminate is applied to the core region of the electrode layer sequence together with the laminating rod. The laminate can thus be applied before or together with the laminating rod.

[0026] According to one embodiment, the laminating rod is designed in multiple parts, for example, in two parts. A first part is inserted into the winding core from an upper side of the electrode coil, and a second part from a lower side. The laminating rod can be designed in one part, two parts, or in multiple parts. The parts form, for example, the laminating rod when it is inserted into the axial cavity. The rod can, for example, be provided with locking positions that enable a defined and controllable pressure. As a multi-part embodiment, it is conceivable, for example, to provide middle parts that are inserted into the axial cavity separately from the first and second parts.

[0027] According to one embodiment, the laminating rod is designed in two parts, so that upon insertion the first part from the upper side and the second part from the lower side of the electrode coil engage with each other when they are fully inserted into the winding core, so that after engagement the pressure on the core region of the electrode layer sequence is established. Engagement can also occur at a middle part if the rod is designed in several parts. Furthermore, a cylindrical energy storage cell is proposed. According to one embodiment, the cylindrical energy storage cell comprises an electrode layer sequence with at least one anode, one cathode and one separator. The electrode layer sequence is wound to form an electrode coil. A core region of the electrode layer sequence is laminated. The core region of the electrode layer sequence forms the winding core of the electrode coil.

[0028] According to one embodiment, the core region of the electrode layer sequence was laminated according to one or more aspects of the method presented above for laminating a cylindrical energy storage cell.

[0029] In the following, exemplary embodiments are described with reference to the accompanying drawings. Further details, preferred embodiments, and further developments emerge from them. Identical or similarly functioning components are provided with the same reference numerals in the figures. The components depicted, as well as their relative sizes, are not to be considered to scale. To the extent that components and parts in the various figures have the same function, their description is not necessarily repeated for each of the following figures.

[0030] In detail:

[0031] Figure 1 shows an embodiment of a method for laminating a cylindrical energy storage cell,

[0032] Figure 2 shows an embodiment of a cylindrical energy storage cell, and

[0033] Figure 3A - 30 embodiments of laminating rods for laminating a cylindrical energy storage cell.

[0034] Detailed

[0035] Figure 1 shows an embodiment of a method for laminating a cylindrical energy storage cell. In a first step S1, an electrode layer sequence is prepared or produced. The electrode layer sequence 1 comprises a sequence of electrode layers, at least one anode and one cathode. The electrode layers are embodied, for example, as metal foils with active materials. Furthermore, at least one separator or separator layer is provided, which is arranged between the anode and the cathode in the electrode layer sequence 1.

[0036] In further steps, a core region of the electrode layer sequence 1 is laminated (step S2) and the electrode layer sequence 1 is wound up to form an electrode coil (step S3). The order of these steps can vary and / or the lamination can be carried out multiple times. This is indicated in the figure by the solid and dashed arrows. Regardless of the order, a core region 2 of the electrode layer sequence 1 is laminated by bonding a laminate to the core region 2 of the electrode layer sequence 1 under the pressure and temperature generated by a laminating rod 200. The laminate is, for example, a polymer, for example a thin polymer film or a porous material such as a nonwoven. In addition, the laminate can be used as a separator between the electrode layers of the electrode layer sequence 1, i.e. the separator and laminate can be identical or complement each other.Alternatively, or additionally, the laminate can be applied to a surface of the electrode layer sequence 1.

[0037] In one variant, the laminate is first applied as part of the electrode layer sequence 1. This occurs, for example, between the anode and cathode as a separator or in addition to or in addition to the separator. Alternatively, or additionally, the laminate can be applied to a surface of the electrode layer sequence 1. In a next step, the core region 2 of the unwound electrode layer sequence is then laminated. This is done by the laminating rod 200 exerting a pressure and a temperature for lamination on the core region 2 by local pressing or rolling. The lamination thus occurs parallel to or before the winding of the electrode layer sequence 1 into an electrode coil 120.

[0038] In a further variant, the electrode layer sequence 1 is first wound to form the electrode coil 120. The laminate can already be applied to the electrode layer sequence 1 or can be applied after winding, for example, using the laminating rod 200. The winding of the electrode layer sequence 1 into an electrode coil 120 is carried out such that the core region 2 of the electrode layer sequence 1 forms the winding core 190 of the electrode coil 120. The core region 2 of the electrode layer sequence 1 is laminated to form an electrode coil 120 after the winding of the electrode layer sequence 1. The lamination is carried out by the laminating rod 200. For this purpose, the laminating rod 200 is inserted along the central axis 210 (or the axial cavity 220 of the electrode coil 120). The laminating rod 200 is inserted in such a way that it exerts a pressure on the core region 2 of the electrode layer sequence 1 in a position that supports the lamination.If the laminating rod 200 is heated in this position, the temperature for laminating can be set and the core area 2 can be laminated under the set pressure.

[0039] Figure 2 shows an exemplary embodiment of a cylindrical energy storage cell. It shows a schematic sectional view of a cylindrical energy storage cell, also called a round cell. Typically, several battery cells 100 are combined into a battery pack and form a battery for an electric vehicle (not shown), in particular a drive battery for an electric motor of the electric vehicle. The battery cell 100 can, for example, have a diameter of 46 mm and a length of 95 mm.

[0040] The battery cell 100 has a housing 110 in the form of a hollow cylinder made of an electrically conductive material. An electrode winding 120 is arranged in the housing 110, which can be formed by winding an electrode layer sequence 1 around a winding core 190. An anode of the electrode winding 120 is connected to a base plate 130 of the housing 110 via a current collector 150 and corresponding electrical connections 140. The base plate 130, like the anode current collector 150, can be made of copper, whereby the battery cell 100 can be electrically connected from outside the battery cell 100 through the base plate 130.

[0041] Similarly, on a side of the hollow cylinder 110 opposite the base plate 130, a contact plate 170 is arranged. The contact plate 170 comprises an electrically conductive material and is electrically connected to the cathode by electrical connections 180 with a cathode current collector 160, so that the battery cell 100 can be electrically connected from outside the battery cell 100 through the contact plate 170. The contact plate 170 and the electrical connections 180 comprise, in particular, aluminum. The cathode current collector 160 as well as the aforementioned anode current collector 150 are each produced by compression or folding. The electrode coil 1 is placed in the cylindrical housing 110. The housing serves, for example, as a current collector. The housing 110 is also filled with an electrolyte (not shown), so that the electrode coil 1 forms an electrochemical storage cell with the electrolyte.For example, the electrochemical storage cell can be designed as a lithium-ion battery or a sodium-ion battery. In the assembled storage cell, the lamination rod 200 is finally removed, forming an axial cavity 220 (jelly-roll core) along the central axis 210. A solid electrode winding core (or jelly-roll core) is not necessary.

[0042] Figures 3A to 3C show exemplary embodiments of laminating rods for laminating a cylindrical energy storage cell. The laminating rod 200 combines two functions. Firstly, the rod 200 is shaped such that it can exert pressure on the core region of the electrode layer sequence during lamination. Secondly, the laminating rod 200 can be heated and is thus configured to exert a temperature on the core region. In this combination, the laminating rod 200 can effect the lamination of the core region through pressure and temperature.

[0043] The laminating rod 200 can, for example, be a one-piece or two-piece version. The laminating rod 200 is shaped such that it exerts pressure and temperature on the core area when inserted into the axial cavity 220 of the electrode coil 1 or when pressed or unrolled. In the one-piece version, the laminating rod 200 is inserted, pressed, or unrolled as a whole. In the two-piece version, the laminating rod 200 can be used in parts. For example, parts of the laminating rod 200 are inserted into the axial cavity 220 of the electrode coil 1 from different sides of the electrode coil 1.

[0044] Figure 3A shows a two-part variant of the laminating rod. The laminating rod 200 can, for example, be described by a cylinder. The illustrated parts 205, 210 are then, for example, cylindrical sections of the cylindrical laminating rod 200 (see left, dashed line). If the first part 205 is inserted into the winding core 190 from an upper side and the second part 210 from a lower side of the electrode coil 120, the two parts 205, 210 can meet along their intersection surfaces 215 in the winding core 190 (see Figure 3B). In this final position, pressure and temperature can then be exerted on the core region 2. In a two-part variant, it may be sufficient if one part of the laminating rod 200 is configured to be heated. In the final position, the two parts 205, 210 can touch each other along their cutting surfaces 215 and thus transfer the temperature to the core area 2 by heat conduction.Both parts 205, 210 together exert pressure on core area 2.

[0045] Figure 3C shows, by way of example, how the two parts of the laminating rod from Figure 3A can meet along their intersection surfaces 215 in the winding core 190. Different pressures can be set depending on the advance of the two parts 205, 210. The left-hand drawing shows a first end position, which corresponds to a first pressure. This is indicated by a dashed rectangle. Starting from this position, if the advance is increased and the two parts 205, 210 are brought closer together, a second end position can be reached, which corresponds to a second pressure. This is indicated by another dashed rectangle.

[0046] Figure 3C shows another two-part variant of the laminating rod. In this variant, parts 205, 210 are designed as symmetrical half-cylinders. The half-cylinders each comprise a stop surface 220. If the half-cylinders are inserted from the upper or lower side of the electrode coil 120, they can engage with the stop surfaces 220 in the final position when they are completely inserted into the coil core 190. After engaging, the pressure on the core region 2 of the electrode layer sequence 1 is established, and the lamination temperature can be adjusted.

[0047] Although the improved concept has been illustrated and described in detail using exemplary embodiments, it is not limited by the exemplary embodiments. Rather, other variations of the improved concept may be derived therefrom by those skilled in the art without departing from the scope of protection defined by the claims.

[0048]

[0049] 1 Electrode layer sequence

[0050] 2 Core area

[0051] 100 battery cells

[0052] 110 housings

[0053] 120 electrode coils

[0054] 130 base plate

[0055] 140 electrical connections

[0056] 150 anode current collectors

[0057] 160 cathode current collectors

[0058] 170 contact plate

[0059] 180 electrical connections

[0060] 190 winding core

[0061] 200 laminating sticks

[0062] 210 central axis

[0063] 220 axial cavity

[0064] S1 - S3 process steps

Claims

1. A method for laminating a cylindrical energy storage cell, comprising the steps of: - providing an electrode layer sequence (2) comprising at least one anode, one cathode and one separator, - laminating a core region (2) of the electrode layer sequence (1) by bonding a laminate to the core region (2) of the electrode layer sequence (1) under the pressure and temperature generated by a laminating rod (200), and - Winding the electrode layer sequence (1) to form an electrode coil (120), so that the core region (2) of the electrode layer sequence (1) forms the winding core (190) of the electrode coil (120).

2. The method according to claim 1, wherein the core region (2) of the electrode layer sequence (10) is laminated parallel to or before the winding of the electrode layer sequence (1) to form an electrode coil (120).

3. The method according to one of the preceding claims, wherein the core region (2) of the electrode layer sequence (1) is laminated by the laminating rod (200) exerting pressure and temperature for lamination on the core region (2) by local pressing or rolling.

4. The method according to one of the preceding claims, wherein the core region (2) of the electrode layer sequence (1) is laminated to form an electrode coil (120) after the winding of the electrode layer sequence (1).

5. The method according to one of the preceding claims, wherein the electrode layer sequence (1) is wound around the laminating rod (200) and the laminating rod (200) is removed from the electrode coil (120) after winding.

6. The method according to any one of the preceding claims, wherein the laminating rod (200) is inserted into the winding core (190), and the laminating rod (200) is shaped is that the pressure on the core region (2) of the electrode layer sequence (1) is adjusted as a result of the shape of the laminating rod (200).

7. The method according to one of the preceding claims, wherein the laminate is applied to the core region (2) of the electrode layer sequence (1) before insertion of the laminating rod (200) and / or the laminate is applied to the laminating rod (200) and is applied to the core region (2) of the electrode layer sequence (1) together with the laminating rod (200).

8. The method according to one of the preceding claims, wherein the laminating rod (200) is designed in two parts and a first part (205) is inserted into the winding core (190) from an upper side and a second part (210) from a lower side of the electrode winding (120).

9. The method according to one of the preceding claims, wherein the laminating rod (200) is designed in two parts and, upon insertion, the first part (205) from the upper side engages with the second part (210) from the lower side of the electrode coil (120) when they are inserted into the coil core (190), and after engagement, the pressure on the core region (2) of the electrode layer sequence (1) is established.

10. A cylindrical energy storage cell comprising an electrode layer sequence (1) with at least one anode, one cathode and one separator, wherein: - the electrode layer sequence (1) is wound into an electrode coil (120), - a core region (2) of the electrode layer sequence (120) is laminated, and - the core region (2) of the electrode layer sequence (1) forms the winding core (190) of the electrode winding (120).

11. The cylindrical energy storage cell, wherein the core region of the electrode layer sequence was laminated according to a method of claims 1 to 9.

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