Method for manufacturing an electrochemical storage cell and electrochemical storage cell

Abstract

A method for manufacturing an electrochemical storage cell is presented. The method comprises the following steps: providing a flat, essentially circular contact disk (200) having at least two contact sections (201, 202) which each constitute a sector of the contact disk (200) and are arranged symmetrically around a center point (204) of the contact disk (200), and wherein between the contact sections (201, 202) sector sections (205, 206) are removed from the contact disk (200) and are arranged symmetrically around the center point (204) of the contact disk (204); arranging an electrode roll (190) in a cylindrical cell housing (110), wherein the electrode roll (190) comprises an electrode layer sequence (1); contacting the electrode roll (190) by contacting edge regions of the electrode layer sequence with a first face of the contact sections (201, 202) of the contact disk (200); and welding the electrode roll (190) to the contact disk by applying a welding arc (209) to a second face (208) of the contact sections (201, 202) which faces away from the first face of the contact disk (200), wherein the welding arc (209) is arranged at least partially concentrically around the center point (204).

Description

Technical Field

[0001] The following description relates to a method for manufacturing an electrochemical storage cell and an electrochemical storage cell. Background Technology

[0002] Increasing demands are being placed on modern electrochemical storage cells, battery cells, or simply cells (Zelle), in terms of the ratio of installation space to power. This presents numerous technical challenges, one of which involves efficient electrode contact. Cylindrical cell (also known as spherical cell) is a possible structural form of electrochemical storage cell, used in a variety of applications such as electric vehicles, electronic devices, energy storage systems, and emergency power supplies. Compared to flat cell, these cells offer the advantage of higher energy density due to better heat dissipation and greater mechanical stability. Furthermore, they have low resistance and are therefore commonly used in applications requiring high discharge rates.

[0003] A circular monomer comprises an electrolyte, a cathode, an anode, and a diaphragm, which are wound together to form an electrode roll, also known as a jelly roll structure. The electrodes are, for example, metal foil. The electrode roll is then placed in a cylindrical housing made of metal or plastic, serving as a current collector. A technical challenge lies in establishing contact between the electrodes of the electrode roll and the monomer housing. In existing technologies, for example, conductive tabs are provided for the electrodes, which are welded to a contact plate after the electrode roll is assembled into the housing. In this way, the contact plate establishes a conductive connection between the electrode or metal foil and the pole or monomer housing.

[0004] To date, various electrode rolls with different tab designs have been proposed, such as the so-called "variable-distance tab" and "kneading tab" designs for cylindrical cells. However, the traditional design with a flat, disc-shaped contact pad has always been used as the current collector for cylindrical cells. Consequently, the advantages of different tab designs are not fully utilized. Therefore, it is necessary to identify the weaknesses of current designs and make corresponding improvements. This also requires the development of optimized welding patterns corresponding to the disc designs of current cylindrical battery cells.

[0005] The design of contact discs for circular monomers is typically divided into six to eight sections, with three to four evenly distributed sections serving as current paths. The remaining sections act as reinforcement. Due to boundary layer effects, the shape of the divided contact discs can impede liquid flow. Since, in the case of cylindrical monomers, the exhaust section is typically located within the wound core, the contact disc structure must consider gas emissions during thermal events and maintain the current path during normal operation of the monomer. However, existing solutions suffer from the problem of gas emission disturbances, which can often obstruct exhaust gas flow, making it difficult to meet safety requirements.

[0006] Here, typical welding modes play a crucial role in the sealing of the monomer. Along with advantageous designs for the contact disc, appropriate welding modes should also be developed based on the disc design. The welding mode in cylindrical electrochemical storage monomers depends on the monomer's structure and dimensions. Some commonly used welding modes for cylindrical electrochemical monomers are: simple butt welding, where the two ends of a cylinder are welded together to form a complete monomer; double-fold welding, which creates a double-fold joint where the two ends of the cylinder are folded over each other and then welded; tubular welding, where tubular electrodes are used to weld the two ends of the cylinder together; resistance welding, a welding method that uses current to heat the two ends of the cylinder and then welds them; and laser welding, where laser technology is used to melt the two ends of the cylinder and then join them together to form a monomer. Other welding modes may also be used depending on the specific requirements of the electrochemical monomer. Summary of the Invention

[0007] The objective is to propose a method for manufacturing an electrochemical storage cell and an electrochemical storage cell that at least partially overcomes the limitations discussed above in the prior art.

[0008] These tasks are accomplished by methods for manufacturing electrochemical storage cells, having the features of independent and parallel claims, as well as the electrochemical storage cells themselves. Advantageous embodiments and improvements of the invention are derived from the dependent claims.

[0009] The following is based on the premise that each feature described with respect to any implementation 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 implementation or in any combination of any other implementation, unless expressly described as an alternative. Furthermore, equivalents and modifications not described below may be used without departing from the scope of the claimed subject matter.

[0010] The following describes a method for manufacturing electrochemical storage cells. According to one embodiment, a flat, substantially circular contact disk is first provided, the contact disk having at least two contact segments. These contact segments respectively form sector sections of the contact disk and are arranged symmetrically around the center point of the contact disk. The sector sections are removed from the contact disk between the contact segments, and these sector sections are here arranged symmetrically around the center point of the contact disk.

[0011] In a further step, an electrode roll is arranged within a cylindrical monolithic housing, wherein the electrode roll comprises a sequence of electrode layers. The electrode roll is made into conductive contact with the contact segment by contacting the edge region of the electrode layer sequence with the first surface of the contact segment. Finally, the electrode roll is welded to the contact segment by applying a welding arc to the second surface of the contact segment opposite to the first surface of the contact segment. Here, the welding arc is arranged concentrically around a center point, at least partially.

[0012] For example, the welding arc follows the geometry of the contact pad. The number of contact segments is not limited herein and below. The two segments mentioned should be understood as examples. The number of contact segments can be determined by considering the desired unit design.

[0013] The proposed method allows the fabrication of an electrochemical storage cell with a design largely independent of the arrangement and shape of the conductive tabs on the electrode roll. For example, zero or more different tabs can be used, shaped, and arranged. Examples, non-exhaustively, include relief cuts, relief cuts with variable distances, and kneading. However, more advantages can be achieved with relief cuts compared to kneading. For combined tab shapes, the shapes of relief cuts and kneading can also be combined.

[0014] The performance of an electrochemical storage cell depends on effective functional partitioning. Here, the tabs located in the edge region of the contact pad, serving as current paths, play a crucial role. The shortened current path reduces heat generation, improving cell performance and enabling faster charging. Uniform current distribution also increases lifespan, improves fast-charging performance, and reduces liquid resistance. The symmetrical spacing of the fan-shaped sections removed between contact segments optimizes electrolyte and gas paths, resulting in reduced interference when the air passage is open. This improves safety by reducing short circuits between the positive contact pad and the negative cell housing during pin puncture. Furthermore, the contact pad can be welded using a welding arc in a faster process.

[0015] The improved concept proposed here is based in particular on the considerations described below. The contact pad for the electrochemical storage cell can be divided into uniform contact segments, such as two, three, or four segments. In this way, a uniform current path can be achieved and boundary layer effects can be minimized. The contact segments are symmetrically arranged and designed so that they make contact with each other to ensure sufficient gas venting path during thermal triggering, and simultaneously provide a uniform current path in both the core and outer regions of the electrode roll. An advantageous welding path designed according to this pad is an arc-shaped section that connects all joints in the welding area and serves as the current path. A larger welding area ensures that the current path remains consistent regardless of the charge-discharge rate (C-Rate), which is relevant to fast charging in the automotive field as well as vibration and plastic deformation.

[0016] Other aspects of the considerations involve a contact plate with a current collector design structure featuring symmetrical current paths and connection paths that prevent blockage of venting capabilities during thermal triggering. The connection paths can be welded to the connector to provide sufficient current path while simultaneously ensuring uniform current distribution within the electrode roll. An arc welding mode that connects the electrode roll and the connector (tab) in the current collector, independent of tab shape (such as variable distance, conventional subtractive cut, or "kneading"), can contribute to improved performance, such as fast charging.

[0017] The term "energy storage cell" here refers to an electrochemical energy storage device, particularly a rechargeable energy storage device, suitable for storing electrical energy and supplying it to electrical devices, such as those in vehicles. This electrochemical storage cell is particularly a lithium-ion or sodium-ion battery, and thus the following description relates especially to lithium-ion or sodium-ion batteries.

[0018] In the following text, the term "lithium-ion battery" is used synonymously with all common names in the prior art for lithium-containing primary batteries and cells, such as lithium battery, lithium cell, lithium-ion cell, lithium polymer cell, lithium-ion battery cell, and lithium-ion rechargeable battery. Similarly, the term "sodium-ion battery" is used synonymously with all common names in the prior art for sodium-containing primary batteries and cells, such as sodium battery, sodium cell, sodium-ion cell, sodium polymer cell, sodium-ion battery cell, and sodium-ion rechargeable battery. The aspects presented within the scope of this specification are not limited to specific types of primary batteries and cells, but can be used, among others, for lithium, magnesium, and sodium-ion batteries. For example, this type using SO2 as an electrolyte can be used. In particular, this includes rechargeable batteries, i.e., so-called secondary batteries. The terms "battery" and "electrochemical cell" are also used as synonyms for the terms "lithium-ion battery" and "lithium-ion cell" or "sodium-ion battery" and "sodium-ion cell."

[0019] A contact plate is a flat disc with a circular shape and a center point. It consists of at least two interconnected or separate contact segments, each forming a sector of the disc and arranged symmetrically around the center point. More than two contact segments may also exist, similarly arranged symmetrically around the center point. If the contact segments are interconnected, it means the contact plate is a single unit, and the contact segments represent multiple parts of the disc. Alternatively, the contact segments may be separate or composed of multiple parts. Openings or recesses are symmetrically arranged between the contact segments, forming another sector of the disc. A sector (also called a fan-shaped section) refers to multiple portions of a circular surface, at least partially defined by an arc and two circular radii (as opposed to a "circular segment / collapse" defined by an arc and a chord). A sector resembles a cake slice viewed from above.

[0020] According to one embodiment, the contact segments of the circular contact disc can be connected together or separated from each other.

[0021] According to one embodiment, an electrode roll is formed by winding an electrode layer sequence into a cylinder. The electrode layer sequence is then contacted with a first surface of a contact pad that is perpendicular to the orientation of the electrode layer sequence. Here, the electrode sequence includes contact areas or edge areas, which are bent (especially bent 180°) (e.g., before winding) such that the bent contact areas contact the first surface and are welded to the contact pad.

[0022] According to one embodiment, a contact pad is welded to a first end of an electrode roll. Furthermore, another contact pad is welded to a second end of the electrode roll opposite the first end. Here, the contact pad has an opening in the region of its center point. The other contact pad has a continuous connection region between the contact segments of the contact pads in the region of its center point.

[0023] According to one embodiment, the contact area includes conductive electrode tabs, which are bent (e.g., bent before winding, and especially bent 180°) such that the conductive electrode tabs contact a first surface of the contact pad. The bent electrode tabs are then welded to the contact pad.

[0024] According to one embodiment, the conductive electrode tabs are arranged in the contact area such that the bent electrode tabs only contact the contact plate in the area of ​​the contact segment.

[0025] Below, an electrochemical storage monomer is proposed. According to one embodiment, the storage monomer includes a cylindrical monomer shell and an electrode roll disposed within the cylindrical monomer shell. The electrode roll includes a sequence of electrode layers.

[0026] The electrochemical storage cell also includes a flat, substantially circular contact disk having at least two interconnected or separate contact segments. These contact segments each form a sector of the contact disk and are arranged symmetrically around the center point of the contact disk. Sector-shaped sections are removed from the contact disk between the contact segments, and these sector-shaped sections are also arranged symmetrically around the center point of the contact disk.

[0027] The electrode roll makes conductive contact with the first surface of the contact segment of the contact disk through the edge region of the electrode layer sequence. Furthermore, the electrode roll is welded to the contact disk by applying a welding arc to the second surface of the contact segment opposite to the first surface of the contact disk. The welding arc is arranged concentrically around a center point, at least partially.

[0028] According to one embodiment, an electrode layer sequence is wound into a cylinder, thereby forming a cylindrical electrode roll. The electrode layer sequence makes conductive contact with a first surface of a contact pad perpendicular to the orientation of the electrode layer sequence and is welded to the contact pad.

[0029] In one embodiment, the contact area includes a bent conductive tab. The bent tab is welded to the contact pad.

[0030] According to one embodiment, the conductive electrode tabs are arranged in the contact area such that the bent electrode tabs only contact the contact plate in the area of ​​the contact segment.

[0031] According to one embodiment, the contact disk has an opening in the region of its center point. Alternatively, the contact disk has a continuous connecting region between the contact segments of the contact disk in the region of its center point.

[0032] Other aspects of electrochemical storage monomers are derived from the methods discussed in this paper for manufacturing electrochemical storage monomers, and vice versa.

[0033] Different embodiments are shown and described in the following figures. Further details, implementations, and optimizations are derived herein. For better identification, identical or similar parts are given the same reference numerals in the figures. The dimensions of the parts shown relative to each other are not drawn to scale. If components or parts perform the same function in different figures, the description does not necessarily have to be repeated in each figure. Attached Figure Description

[0034] It is shown in detail:

[0035] Figure 1 A cross-sectional view of a cylindrical electrochemical storage cell is shown;

[0036] Figures 2A to 2D An embodiment of a contact plate for electrochemical storage cells is shown;

[0037] Figures 3A to 3D Other embodiments of contact pads for electrochemical storage cells are shown; and

[0038] Figure 4 An example of a cylindrical electrochemical storage cell is shown. Detailed Implementation

[0039] Figure 1 A cylindrical electrochemical storage cell 100 (hereinafter referred to as a battery cell or circular cell) is schematically shown in cross-section. For example, it may involve lithium-ion cells or sodium-ion cells. The circular cell 100 shown is suitable, for example, for electric vehicles. Typically, multiple battery cells 100 are combined together to form a package (“battery pack”) and constitute a battery (not shown) for electric vehicles, particularly for the drive battery of an electric motor in an electric vehicle. The battery cell 100 may, 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 conductive material. An electrode roll 120 is arranged within the housing 110, which is formed by winding an electrode layer sequence around a winding core 190. The electrode layer sequence typically includes multiple electrode layers, such as an anode and a cathode. The anode of the electrode roll 120 contacts a first contact pad 200 (e.g., an anode-contact pad) via a current-conducting element 150 (e.g., a tab implemented as an anode). The first contact pad 200 is connected to a base plate 130 of the housing 110 via a corresponding electrical connector 140. The base plate 130 and the first contact pad 200 may be made of copper or other metal, through which the battery cell 100 can be electrically connected to the outside of the battery cell 100.

[0041] Similarly, a contact plate 170 is arranged on the side of the hollow cylinder 110 opposite to the base plate 130. This contact plate is made of conductive material and is electrically connected to a second contact pad 200 (referred to as a cathode-contact pad) via an electrical connector 180, and further electrically connected to the cathode via a corresponding current-delivering element 160 (e.g., a tab). This allows for electrical connection of the battery cell 100 to the outside of the battery cell 100 via the second contact pad 200. The contact plate 170 and the electrical connector 180 are, for example, made of aluminum or other metal. The current-delivering element 160, as well as the aforementioned current-delivering element 150, are formed, for example, by compression or bending, and thereby conductively contact the corresponding contact pad 200. The polarity and arrangement of the battery cell 100 shown are exemplary. Alternatively, the cell may have opposite polarities, thus interchangeable anode and cathode.

[0042] Figures 2A to 2D An embodiment of a contact pad for an electrochemical storage cell is shown. A flat, substantially circular contact pad 200 is shown, which can be used to contact an electrode roll 120, such as a cylindrical circular cell 100. The electrode roll 120 typically includes a sequence of electrode layers having one or more anode layers and one or more cathode layers. The contact pad 200 provides current paths to the electrodes for electrical contact with the anode or cathode, respectively. In this way, the electrodes can be contacted via the posts of the circular cell 100. The contact pad 200 is made of a conductive material, such as a metal.

[0043] Figure 2A The contact plate 200 described herein is an embodiment of an anode-contact plate. The plate, shown in a top view, includes two interconnected contact segments 201 and 202, each forming a sector of the contact plate 200, and connected to each other by an arcuate portion 203. The contact segments 201 and 202 are arranged symmetrically around a center point 204 of the contact plate 200. Between the contact segments 201 and 202, regions 205 and 206 are removed from the contact plate 200, which also form sector segments. These regions 205 and 206 are also arranged symmetrically around a center point 204 of the contact plate 200. In this embodiment of an anode-contact plate, the plate 200 has a central opening 207 around the center point 204, which is partially surrounded by the arcuate portion 203 and opens toward one of the removed regions 205. Preferably, the central opening 207 is larger than the winding core 190 of the electrode roll 120 to prevent material from blocking the opening 207 in the event of a thermal safety incident, and thereby to allow for better discharge from the central opening 207.

[0044] The contact disk 200 is configured as a contact electrode roll 120. For this purpose, the edge regions of the electrode layer sequence can contact the first surfaces (below the disk in the figure) of the contact segments 201, 202 of the contact disk 200. The edge regions respectively include current-conducting elements 150, 160, and may, for example, have conductive tabs that can be bent so that the contact disk 200 can be placed on the edge regions having the current-conducting elements 150, 160 (e.g., bent tabs), and then the tabs touch or conductively contact the first surfaces of the contact segments 201, 202.

[0045] Figure 2B It shows a welding arc 209. Figure 2A The anode-contact disk is formed by applying a welding arc 209 to the second surface 208 of the contact segments 201 and 202, which is opposite to the first surface 208 of the contact disk 200, to weld the electrode roll 120 to the contact disk 200. Since the contact segments 201 and 202 (fan-shaped segments) are partially circular, the welding arc 209 forms a partial arc of a circle and is arranged concentrically around the center point 204 at least partially.

[0046] Figure 2C The contact plate 200 described herein is an embodiment of a cathode-contact plate. The plate 200, shown in a top view, includes two interconnected contact segments 201 and 202, each forming a sector of the contact plate 200, and connected to each other by a continuous, circular connecting region 210. The contact segments 201 and 202 are arranged symmetrically around the center point 204 of the contact plate 200. Between the contact segments 201 and 202, regions 205 and 206 are removed from the contact plate 200, which also form sector segments. These regions 205 and 206 are also arranged symmetrically around the center point 204 of the contact plate 200. In this embodiment of a cathode-contact plate, the plate 200 does not have a central opening 207 around the center point 204, but instead has a connecting region 210.

[0047] The contact disk 200 is configured to contact the electrode roll 120. For this purpose, similar to an anode-contact disk, the edge regions of the electrode layer sequence 1 can contact the first surfaces of the contact segments 201, 202 of the contact disk 200. The edge regions may, for example, have conductive tabs that can be bent so that the contact disk 200 can be placed on the second end of the electrode roll with the tabs, and then the tabs touch or conductively contact the first surfaces of the contact segments.

[0048] Figure 2D It shows a welding arc with multiple arcs. Figure 2CThe cathode-contact disk is used. The electrode roll 120 is welded to the contact disk 200 by applying a welding arc 209 to the second surface 208 of the contact segments 201 and 202, which is opposite to the first surface of the contact disk. Since the contact segments (fan-shaped sections) are partially circular, the welding arcs 209 form a partial arc of a circle and are arranged concentrically around the center point 204, at least partially. Furthermore, one or more welding arcs 209 in the circular connection area 211 can be closed to form a circle.

[0049] Figures 3A to 3D Other embodiments of contact disks for electrochemical storage cells are shown. Flat, substantially circular contact disks 200 are shown, which can be used to contact electrode rolls 120, such as cylindrical circular cells 100. The disks 200 are shown in top view and include two contact segments 201 and 202, which respectively constitute sector-shaped sections of the contact disk 200. The contact segments 201 and 202 are arranged symmetrically around the center point 204 of the contact disk 200. Between the contact segments 201 and 202, regions 205 and 206 are removed from the contact disk 200, which also constitute sector-shaped sections. These regions are also arranged symmetrically around the center point of the contact disk.

[0050] Figure 3A The contact disc 200 is one embodiment, which can be used, for example, as an anode-contact disc. For use in a cylindrical monomer housing 110, the contact disc 200 is arranged, for example, before the contact plate 170. A valve (not shown) can be provided in the contact plate 170, which can be arranged before the central opening 207 and the winding core 190 to allow material to be discharged from inside the monomer.

[0051] exist Figure 3A In the illustrated embodiment, contact segments 201 and 202 are interconnected, particularly electrically connected, by two outer arcuate portions 212 and 213. In other words, contact segments 201 and 202 and outer arcuate portions 212 and 213 substantially constitute contact disk 200. Furthermore, contact disk 200 has a substantially circular central opening 207 centered at center point 204. Preferably, this central opening 207 is larger than the winding core 190 of electrode roll 120 to prevent material from blocking the opening in the event of a thermal safety incident, and thereby allows for better discharge from the central opening 207.

[0052] Figure 3B A similar implementation is shown, which is the same as Figure 3A The difference lies in the absence of a central opening. Instead, contact segments 201 and 202 are interconnected via a central connecting region 210. This embodiment can be used, for example, as a cathode-contact disk, and thus supplements... Figure 3A The contact plate in the middle serves as the anode-contact plate.

[0053] Figure 3C and Figure 3D It shows the corresponding Figure 3A and Figure 3B Examples of these implementations differ in that they do not include an external curved portion.

[0054] Figures 3A to 3D The implementation method can be arranged on the carrier 211.

[0055] The proposed contact disk 200 can be configured such that contact segments 201, 202 form welding areas corresponding to the edge regions of electrode roll 120. For example, tabs 150, 160 can be arranged on the edge regions such that, in the assembled state of the circular unit 100, they are essentially located only below contact segments 201, 202. In this way, the disk material can exist only in the welding areas, and the function of the contact disk 200 is separated. Thus, there is a current path through contact segments 201, 202, as well as possible gas flow for venting and ventilation through the empty portions removed from the contact disk 200 (i.e., regions 205, 206). Electrolyte filling can also be performed through these regions 205, 206.

[0056] The shape of the disc can be interpreted as the BMW logo and thus used to clearly identify the company's battery cells. To prevent the internal material venting openings of the electrode roll from being blocked in the event of a thermal event, a central opening 207 can be provided in the contact disc 200, which allows for ventilation. The contact disc 200 can be welded to the cell housing, for example, via the outer edge of the disc. "Pizza-shaped" elements that can be connected or separated via the outer or inner edges also exist. Ventilation obstruction can be avoided via the outer edge of the contact disc. For example, the contact segment can be welded to the housing from the outside.

[0057] Figure 4 The electrode layer sequence 1, which is wound to form an electrode roll 120, is shown schematically and not to scale. The figure here shows the layered structure 1 in a top view. The electrode layer sequence 1 has an anode layer, a cathode layer, and a separator layer that electrically separates the anode and cathode layers from each other. These layers are stacked in an order extending into the drawing plane and are therefore not shown in the top view. It goes without saying that, due to the winding, another separator layer (not shown) can also be provided on the anode layer or the cathode layer to ensure electrical separation of the anode and cathode layers even in the wound state within the electrode roll 120.

[0058] The electrode layer sequence 1 has a generally rectangular basic shape and can be wound, i.e., rolled up, from the first longitudinal end 2 in the longitudinal direction (indicated by the arrow) to the second longitudinal end 3. The first longitudinal end 2 is then located at the winding core 190. Current-conducting elements 150 or 160 extend laterally from the corresponding electrodes on opposite sides 4 and 5 of the layer structure 1, thereby establishing a bond. Figure 1 The electrical connection is shown. The edge region includes multiple conductive electrode tabs 150, 160.

[0059] Figure 5 An embodiment of the edge region of the electrode layer sequence is shown. The tabs (150, 160, anodic or cathode current leads, depending on the viewing direction) are arranged in electrode layer sequence 1 such that they form regions 122 resembling circular segments 201, 202 when bent. For example, the tabs are bent from the inside out, causing them to overlap. This creates a relatively small surface through which the tabs can be welded to contact segments 201, 202. For example, an overlap is typically created in which a 0.4 mm tab is available for contact and welding (radial welding) with the contact pad 200. When welding in an arc shape, a longer weld area can be achieved compared to radial welding, which means lower resistance and a lower probability of unwelded tabs.

[0060] Although the improved concept has been detailed and described with reference to embodiments, it is not limited to those embodiments. Rather, other variations of the improved concept can be derived by those skilled in the art without departing from the scope of protection defined by the claims.

[0061] List of reference numerals

[0062] 1 Electrode layer sequence

[0063] 2 First longitudinal end

[0064] 3 Second longitudinal end

[0065] 4 sides

[0066] 5 sides

[0067] 100 cylindrical electrochemical storage monomers (circular monomers)

[0068] 110 casing

[0069] 120 electrode roll

[0070] 121 Edge Area

[0071] Region 122 (with bent tabs)

[0072] 130 base plate

[0073] 140 electrical connector

[0074] 150 current output component

[0075] 160 current output component

[0076] 170 contact plate

[0077] 180 electrical connector

[0078] 190 winding core

[0079] 200 contact plate

[0080] 201 contact section

[0081] 202 contact section

[0082] 203 Arc-shaped section

[0083] 204 center point

[0084] 205 areas removed

[0085] 206 areas removed

[0086] 207 Center Opening

[0087] 208 sides

[0088] 209 welding arc

[0089] 210 Connection Area

[0090] 212 External arc-shaped part

[0091] 213 External arc-shaped part

Claims

1. A method for manufacturing an electrochemical storage cell, comprising the following steps: - A flat, substantially circular contact disk (200) is provided, the contact disk having at least two contact segments (201, 202), the contact segments respectively forming sector sections of the contact disk (200) and arranged symmetrically around the center point (204) of the contact disk (200), and wherein sector sections (205, 206) are removed from the contact disk (200) between the contact segments (201, 202), and the sector sections are arranged symmetrically around the center point (204) of the contact disk (204); - An electrode roll (190) is arranged in a cylindrical single-unit housing (110), wherein the electrode roll (190) includes an electrode layer sequence (1). - The electrode roll (190) is contacted by contacting the edge regions of the electrode layer sequence with the first surfaces of the contact segments (201, 202) of the contact disk (200); and - The electrode roll (190) is welded to the contact disk by applying a welding arc (209) to the second side (208) of the contact segment (201, 202) opposite to the first side of the contact disk (200), wherein the welding arc (209) is arranged concentrically around the center point (204) at least partially.

2. The method according to claim 1, wherein, - The electrode roll (190) is formed by winding the electrode layer sequence (1) into a cylinder. - The electrode layer sequence (1) is brought into contact with a first surface of the contact disk (200) perpendicular to the orientation of the electrode layer sequence (1), wherein the electrode layer sequence (1) includes contact areas (150, 160), and the contact areas are bent, in particular bent by 180°, for example before winding, such that the bent contact areas (150, 160) contact the first surface and are welded to the contact disk (200).

3. The method according to any one of the preceding claims, wherein, - Weld the contact plate (200) to the first end of the electrode roll (1), and weld the other contact plate (200) to the second end of the electrode roll (1) opposite to the first end; wherein: - The contact plate (200) has an opening (207) in the region of the center point (204), and - The additional contact plate (200) has a continuous connection area (210) between the contact segments (201, 202) of the contact plate (200) in the region of the center point (204).

4. The method according to any one of the preceding claims, wherein, - The contact areas (150, 160) include conductive electrode tabs, which are respectively bent—for example, bent before winding and especially bent by 180°—such that the conductive electrode tabs contact the first surface of the contact disk (200); and - Weld the bent tabs to the contact plate (200).

5. The method according to any one of the preceding claims, wherein, The conductive electrode tabs are arranged in the contact area such that the bent electrode tabs only contact the contact plate (200) in the area of ​​the contact segments (201, 202).

6. An electrochemical storage monomer, comprising: - A cylindrical monolithic housing (110) and an electrode roll (190) arranged in the cylindrical monolithic housing, wherein the electrode roll (190) includes an electrode layer sequence (1). - A flat, substantially circular contact disk (200) having at least two contact segments (201, 202), the contact segments forming fan-shaped sections of the contact disk (200) and arranged symmetrically around the center point (204) of the contact disk (200), wherein fan-shaped sections (205, 206) are removed from the contact disk (200) between the contact segments (201, 202), and the fan-shaped sections are arranged symmetrically around the center point (204) of the contact disk (200); wherein, electrode roll (190): - Conductive contact is made between the edge regions (150, 160) of the electrode layer sequence (1) and the first surface of the contact segments (201, 202) of the contact disk (200); and - Welding is performed on the second side (208) of the contact segment (201, 202) opposite to the first side of the contact disk (200) by applying a welding arc (209), wherein the welding arc (209) is arranged concentrically around the center point (204) at least partially.

7. The electrochemical storage cell according to claim 6, wherein, - The contact sections (201, 202) of the circular contact disc (200) are connected together; or - The contact sections (201, 202) of the circular contact plate (200) are separated from each other.

8. The electrochemical storage cell according to any one of the preceding claims, wherein, - The electrode layer sequence (190) is wound into a cylinder, thereby forming a cylindrical electrode roll; and - The electrode layer sequence (1) makes conductive contact with the first surface of the contact disk (200) perpendicular to the orientation of the electrode layer sequence (1) and is welded to the contact disk (200).

9. The electrochemical storage cell according to any one of the preceding claims, wherein, - The electrode layer sequence (1) includes contact regions (150, 160) that are bent, particularly bent by 180°; and - The bent contact area (150, 160) is welded to the contact plate (200).

10. The electrochemical storage cell according to any one of the preceding claims, wherein, - The contact area (150, 160) includes the bent conductive electrode tabs; and - The bent tabs are welded to the contact plate (200).

11. The electrochemical storage cell according to any one of the preceding claims, wherein, The conductive electrode tabs are arranged in the contact areas (150, 160) such that the bent electrode tabs only contact the contact plate (200) in the area of ​​the contact segments (201, 202).

12. The electrochemical storage cell according to any one of the preceding claims, wherein, - The contact plate (200) has an opening (207) in the area of ​​the center point (204); or - The contact plate (200) has a continuous connection area between the contact segments of the contact plate in the region of the center point (204).

Images