Electrochemical energy storage element having contact plate metallic component, and manufacturing method of the same

Abstract

To provide an electrochemical energy storage element having a contact plate metallic component and provide a manufacturing method of the same.SOLUTION: The present invention proposes an electrochemical energy storage element (100) having a housing. An electrode-separator assembly (104) is arranged in the housing. The electrode-separator assembly (104) contains sides (104a and 104b) defined by a peripheral edge or a plurality of edges. A contact plate metallic component (110) is mounted onto the sides (104a and 104b) of the electrode-separator assembly (104), and is connected to the electrode-separator assembly in a region on the side by welding. In addition, in the energy storage element (100), the contact plate metallic component (110) contains at least one portion (120) that is bent in a direction of the electrode-separator assembly (104), particularly, that is bent on the edges defining the sides or on one of the plurality of edges defining the sides.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electrochemical energy storage element having at least one contact sheet metal member resting on an end surface of an electrode-separator assembly of the electrochemical energy storage element, and to a method of manufacturing such an electrochemical energy storage element. [Background technology]

[0002] Electrochemical energy storage elements are capable of converting stored chemical energy into electrical energy by means of redox reactions. Electrochemical energy storage elements generally include at least one storage cell with a positive electrode and a negative electrode separated from each other by a separator. During discharge, as a result of an oxidation process, electrons are released at the negative electrode. This results in an electronic current that can be extracted by an external electrical consumer, with the at least one electrochemical energy storage cell acting as an energy supplier. At the same time, an ionic current corresponding to the electrode reactions is generated within the cell. This ionic current crosses the separator and is made possible by an ion-conducting electrolyte.

[0003] If the discharge is reversible, i.e., the conversion of chemical energy to electrical energy is reversed during discharge, so that the cell can be recharged, it is said to be a secondary cell. The common designation of the negative electrode as the anode and the positive electrode as the cathode in a secondary cell refers to the discharge function of the electrochemical cell.

[0004] Lithium-ion cells are currently used in many applications and feature a relatively high energy density, as they can supply large currents. Lithium-ion cells are based on the use of lithium, which in the form of ions can move back and forth between the electrodes of the cell.

[0005] The negative and positive electrodes in the energy storage element are often formed by so-called composite electrodes, which contain electrochemically inactive and electrochemically active components. The composite electrodes are usually combined with one or more separators to form an electrode-separator assembly. The basic function of the cell can be established by impregnating the assembly with an electrolyte. Alternatively, a solid electrolyte can be used instead of the separator impregnated with electrolyte.

[0006] In many embodiments of the energy storage element, the electrode-separator assembly is formed in the form of a winding or processed into a winding. The electrode-separator assembly typically includes a positive electrode / separator / negative electrode arrangement. The assembly is often fabricated as a so-called two-cell with possible arrangements of negative electrode / separator / positive electrode / separator / negative electrode or positive electrode / separator / negative electrode / separator / positive electrode. In other embodiments, the electrode-separator assembly is formed by stacking electrodes with a separator or solid electrolyte layer between them.

[0007] Energy storage elements including an electrode-separator assembly in the form of a winding often have a cylindrical structure. A distinction is made between cylindrical round cells and button cells. Cylindrical round cells are generally characterized by the fact that their height is greater than their diameter. Button cells, on the other hand, have a height that is smaller than their diameter.

[0008] Some button cells are provided in very small configurations, suitable for example for powering small electronic devices such as watches, hearing aids, wireless headphones or the like. Button cells typically have a maximum diameter of less than 3 cm.

[0009] A typical form factor for a cylindrical circular cell is, for example, 21×70 (diameter×height in mm). Modern lithium-ion cells of this form factor can achieve, for example, energy densities up to 270 Wh / kg.

[0010] The housing of an energy storage element having an electrode-separator assembly of stacked electrodes is usually a prismatic housing, characterized by a polygonal base, in particular a rectangular base. The stack generally comprises electrodes having similar polygonal shapes arranged on top of each other in such a way that the electrode-separator assembly is also prismatic. Such a prismatic assembly can completely fill the interior space of the prismatic housing. Typically, all electrodes with the same polarity are connected to a common current conductor that electrically connects the electrodes to the metal housing part of the prismatic housing or is connected to a rod leading out of the housing through a corresponding opening.

[0011] In the patent application EP 1 239 633 A1, an energy storage cell is described in which the electrodes are ribbon-shaped and the electrode-separator assembly is in the form of a winding. The electrodes each have a current collector on which electrode material is attached. Opposite polarity electrodes are arranged offset from one another in the electrode-separator assembly, such that the longitudinal edge of the current collector of the positive electrode protrudes from the winding on one side and the longitudinal edge of the current collector of the negative electrode protrudes from the winding on the opposite side. For electrical contact of the current collectors, the cell has at least one contact plate metal element resting on one of the longitudinal edges at one end face of the electrode-separator assembly. The contact plate metal element is connected to the longitudinal edges by welding. This allows electrical contact to be made over the entire length with the current collector and therefore also with the associated electrode. This significantly reduces the internal resistance in the described cell. As a result, high current generation can be absorbed much better.

[0012] The housing of the electrochemical energy storage element is often made of metal components. For example, the housing may be formed from a cup-shaped metal housing part and a metal lid part. In these cases, the energy storage element may be manufactured in such a way that the electrode-separator assembly in the form of the described winding or stack is inserted into the cup-shaped housing part before closing the housing with a welded lid part, for example. These steps of manufacturing the energy storage element are generally carried out in an automated manner as part of an industrial manufacturing process.

[0013] To achieve the highest possible energy density of the energy storage element to be manufactured, an attempt is generally made to incorporate as much electrochemically active material into the energy storage element as possible. Thus, an attempt is made to maximize the housing volume available for the electrode-separator assembly by inserting the largest possible assembly into the housing. This can cause problems, for example, when inserting a cylindrical winding into a cup-shaped housing section. If the electrode-separator assembly presses too hard against the interior of the housing during insertion, the insertion can fail or be damaged.

[0014] This problem may be exacerbated by contact plate metal members welded to the electrode-separator assembly, as described in U.S. Pat. No. 5,399,363. This is especially true if the contact plate metal members are not precisely positioned on each end face of the electrode-separator assembly and protrude beyond the edges of the end faces. Accurate centering of such contact plate metal members is not always easy in industrial manufacturing processes, since the periphery of the electrode-separator assembly may be subject to manufacturing-related variations, and as a result, this may cause problems simply when placing and welding the contact plate metal members to the end faces.

[0015] Furthermore, if the contact plate metal members are not positioned accurately, the electrode-separator assembly may not be welded to the contact plate metal members optimally or over the entire available area of ​​each end face. For example, if the contact plate metal members are not positioned optimally, the outer windings of the cylindrical electrode-separator assembly may not be able to make contact with the contact plate metal members. This may increase the internal resistance of the target energy storage element.

[0016] Various procedures are already known that address the known problems of inserting the electrode-separator assembly into the housing. For example, US Pat. No. 5,399,433 proposes compressing the electrode-separator assembly before inserting it into the housing. US Pat. No. 5,399,433 relates to a method of manufacturing an energy storage element in which a metal housing part is heated before inserting the electrode-separator assembly. This causes the housing part to expand so that the electrode-separator assembly can be inserted into the housing part more easily. However, the smaller the housing part, the less heating occurs. However, these approaches do not solve the problems discussed above regarding the contact plate metal members disposed on the end faces of the electrode-separator assembly. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] International Publication No. 2017 / 215900A1 Brochure [Patent Document 2] U.S. Patent No. 10505222B2 [Patent Document 3] European Patent Application Publication No. 4053955A1 Summary of the Invention [Problem to be solved by the invention]

[0018] Against this background, the present invention sets itself the task of facilitating the accurate positioning of the contact plate metal members on the end faces of the electrode-separator assembly. Furthermore, the insertion of the electrode-separator assembly into the housing of the energy storage element should be facilitated. [Means for solving the problem]

[0019] This object is achieved by an electrochemical energy storage element having the features of claim 1. Advantageous embodiments of the energy storage element are evident from the dependent claims. Furthermore, the object is solved by a method for producing an energy storage element according to claim 13. Further, advantageous embodiments of the method are evident from the dependent claims.

[0020] The electrochemical energy storage element according to the present invention comprises: a. the electrochemical energy storage element includes a housing; b. the electrode-separator assembly is disposed within the housing; c. the electrode-separator assembly includes one side defined by a peripheral edge or multiple edges; d. The contact plate metal member rests on a side of the electrode-separator assembly defined by a peripheral edge or edges and is connected to the electrode-separator assembly in the area of ​​the side by welding. It is characterized by the following features.

[0021] According to the present invention, the energy storage element comprises: e. the contact plate metal member includes at least one portion that is bent in the direction of the electrode-separator assembly, in particular at or on an edge that defines a side; It further has the following characteristic.

[0022] Particularly preferably, at least one portion which is bent in the direction of the electrode-separator assembly, in particular on an edge defining a side, is at least one extension or, alternatively, a protruding region extending from a main part of the contact plate metal member resting on the side.

[0023] Particularly preferably, the bend extension or bend protruding area encloses a bend angle in the range of 60° to 120° with the main part of the contact plate metal part. A bend angle in the range of 80° to 100° is preferred, in particular an angle in the range of 90°±5° or exactly 90°.

[0024] Preferably, the energy storage element according to the invention comprises: a. the electrode-separator assembly includes at least one anode, at least one cathode, and at least one separator in an anode / separator / cathode arrangement; b. the electrode-separator assembly comprises at least one anode, at least one cathode, and at least one layer of solid electrolyte in an anode / solid electrolyte / cathode arrangement; c. the housing in which the electrode-separator assembly is disposed is an air-tight and liquid-tight sealed housing; d. The electrode-separator assembly is electrically connected to an electrode that passes through the housing via a part of the housing or a contact plate metal member. It is characterized by at least one of the following features.

[0025] The energy storage element may have a prismatic or cylindrical housing. In the case of a prismatic housing, the electrode-separator assembly preferably also has a prismatic shape. In the case of a cylindrical housing, the electrode-separator assembly preferably has a cylindrical shape.

[0026] Thus, in a preferred embodiment, the energy storage element according to the invention comprises: a. an electrode-separator assembly formed by spirally wound electrode ribbons having at least one separator ribbon between the spirally wound electrode ribbons, the electrode-separator assembly having first and second end faces and a wound shell between the end faces, one of the end faces being a side of the electrode-separator assembly defined by a periphery; b. the electrode ribbon is formed by a ribbon-shaped current collector coated with an electrode material; c. at least one of the ribbon electrode current collectors has a longitudinal edge that is not covered with electrode material, and the electrode ribbon is disposed within the electrode-separator assembly such that the longitudinal edge that is not covered with electrode material protrudes beyond an end face of the electrode-separator assembly on which the contact plate metal member rests; d. The contact plate metal member is welded to the longitudinal edge protruding from the end face It is characterized by at least one of the following features. Preferably, the above-mentioned features a. to d. are realized in combination with each other.

[0027] In this embodiment, the energy storage element preferably includes a cylindrical housing and a cylindrical electrode-separator assembly.

[0028] Typically, the spirally wound electrode ribbon and at least one separator ribbon preferably have the following dimensions: - Lengths ranging from 0.5m to 25m - Widths ranging from 40mm to 145mm

[0029] To produce a wound electrode-separator assembly consisting of an electrode ribbon and at least one ribbon-like separator, the ribbon-like electrode and at least one separator are typically fed into a winding device and wound, preferably helically, around a winding shaft. Bonding or high temperature gluing of the electrode and separator is typically not required. In some embodiments, the electrode and at least one separator are fitted onto a winding mandrel and wound onto a cylindrical or hollow cylindrical winding core that continues to wind.

[0030] The winding shell can be formed, for example, by a plastic film or an adhesive tape, and can also be formed by one or more separator windings.

[0031] In a further preferred embodiment, the energy storage element according to the invention comprises: a. the electrode-separator assembly is formed by stacked electrodes having a layer of separator or solid electrolyte disposed therebetween; b. the electrode is formed by a current collector coated with an electrode material; c. the electrodes are arranged in the stack such that the current collectors of the positive and / or negative electrodes each have a current collector edge that is not covered with electrode material, and the electrodes are arranged in the stack such that the entire current collector edge of the positive or negative electrode that is not covered with electrode material protrudes from one side of the electrode-separator assembly, this side being the side of the electrode-separator assembly on which the contact plate metal member rests; d. The contact plate metal member is welded to the edge of the current collector protruding from this side It is characterized by at least one of the following features. Preferably, the above-mentioned features a. to d. are realized in combination with each other.

[0032] In this embodiment, the energy storage element preferably comprises a prismatic housing and a prismatic electrode-separator assembly.

[0033] In a prismatic electrode-separator assembly, the current collector edges of the positive and negative electrodes can also protrude from more than one side of the electrode-separator assembly. For example, it may be provided that each positive electrode having a rectangular base shape has two uncoated current collector edges protruding from two adjacent sides of the electrode-separator assembly. In this case, the contact plate metal member can be, for example, L-shaped and rest on both sides on which the uncoated longitudinal edges protrude.

[0034] In the case of a prismatic shape, the electrode-separator assembly preferably includes a plurality of electrodes having a rectangular base shape, whereas in the case of a cylindrical shape, the electrode-separator assembly preferably comprises a spirally wound ribbon electrode and at least one ribbon separator, preferably impregnated with a suitable electrolyte, as is the electrode.

[0035] Additionally, the electrode-separator assembly may be formed as a flat coil with a spirally wound ribbon electrode and have an essentially prismatic shape.

[0036] Preferably, the electrode is a composite electrode comprising the electrochemically active and electrochemically inactive components already described in the introduction.

[0037] The current collectors of the energy storage element according to the invention serve to make electrical contact with the electrochemically active components contained in the respective electrode materials over as large an area as possible. Preferably, the current collectors consist of a metal or are at least metallized on the surface.

[0038] In the case of an energy storage element designed as a lithium-ion cell, suitable metals for the anode current collector are, for example, copper or nickel or other electrically conductive materials, in particular copper and nickel alloys or metals coated with nickel. In particular, materials of the type EN CW-004A or EN CW-008A with a copper content of at least 99.9% can be used as copper alloys. Alloys of the types NiFe, NiCu, CuNi, NiCr and NiCrFe are particularly suitable as nickel alloys. Alloys of the types NiFe, NiCu, CuNi, NiCr and NiCrFe are particularly suitable as nickel alloys. Stainless steels (for example type 1.4303 or 1.4404 or type SUS304) can also be considered.

[0039] For energy storage elements designed as lithium-ion cells, aluminum or other conductive materials, including aluminum alloys, are particularly suitable as the metal for the cathode current collector.

[0040] Suitable aluminum alloys for the cathode current collector are, for example, aluminum alloys of types 1235, 1050, 1060, 1070, 3003, 5052, Mg3, Mg212 (3000 series) and GM55. Also suitable are AlSi, AlCuTi, AlMgSi, AlSiMg, AlSiCu, AlCuTiMg and AlMg. The aluminum content of these alloys is preferably greater than 99.5%.

[0041] Preferably, the anode current collector and / or the cathode current collector are each a metal foil having a thickness in the range of 4 μm to 30 μm.

[0042] However, in addition to foils, other substrates (eg, metal or metallized nonwovens, or perforated metal foams or metal foams) can also be used as current collectors.

[0043] Preferably, each electrode material is attached to either side of the current collector.

[0044] Preferably, the separator of the energy storage element according to the invention is made of an electrically insulating plastic film. This plastic film preferably has pores so that it can be permeated by the liquid electrolyte. The plastic film can consist, for example, of polyolefins or polyetherketones. However, nonwoven fabrics and cloths made of plastic films or other electrically insulating fabrics can also be used as separators. A separator having a thickness in the range of 5 μm to 50 μm is preferred.

[0045] In particular, in the case of a prismatic electrode-separator assembly, a layer of the above-mentioned solid electrolyte can be used instead of the separator. The solid electrolyte has an intrinsic ionic conductivity, and there is no need to impregnate the solid electrolyte with a liquid electrolyte. The solid electrolyte can be, for example, a polymer solid electrolyte based on a polymer conductive salt complex that exists in a single phase without a liquid component. The polymer solid electrolyte can have polyacrylic acid (PAA), polyethylene glycol (PEG) or polymethyl methacrylate (PMMA) as the polymer matrix. The polymer solid electrolyte may include a lithium conductive salt (for example, lithium bis(trifluoromethane)sulfonylimide (LiTFSI), lithium hexafluorophosphate (LIPFS6) and lithium tetrafluoroborate (LIPFS4)).

[0046] Preferably, the longitudinal edges of the separator or separators, or of said layers of solid electrolyte, form the side or sides of the electrode-separator assembly from which the longitudinal edges not covered with electrode material (in the case of a cylindrical electrode-separator assembly) or the full current collector edges of the positive or negative electrodes not covered with electrode material (in the case of a prismatic electrode-separator assembly of a stacked electrode) protrude.

[0047] With regard to electrochemistry, the energy storage element according to the invention is not limited to a particular type. In a particularly preferred embodiment, the energy storage element is or comprises a lithium-ion cell, since such cells can provide a particularly high energy density at a relatively low weight.

[0048] In other embodiments, the energy storage element is a sodium-ion cell or includes a sodium-ion cell, a potassium-ion cell, a calcium-ion cell, a magnesium-ion cell, or an aluminum-ion cell. Of these variations, energy storage elements having a sodium-ion cell chemistry are particularly preferred. As is well known, lithium-ion cells are based on the use of lithium, which in the form of ions can be transported back and forth between the electrodes of an energy storage element.

[0049] In the context of the present invention, all materials capable of absorbing and releasing lithium ions can be considered as electrochemically active components (active materials) for lithium-ion cells. For example, carbon-based particles (e.g., graphitic carbon) are used in the negative electrode. The active material for the positive electrode can be, for example, lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), or derivatives thereof. The electrochemically active material is generally included in the electrode in the form of particles.

[0050] The active material is generally the main component of the layer applied to the current collector. The current collector is an electrochemically inactive component of the energy storage element. Metal foils are particularly suitable as current collectors. The current collector for the negative electrode (anode current collector) of a lithium-ion cell can be made of, for example, copper or nickel, and the current collector for the positive electrode (cathode current collector) can be made of, for example, aluminum. In addition, the electrode can contain an electrode binder (for example, polyvinylidene fluoride (PVDF) or another polymer, for example, carboxymethyl cellulose), a conductivity enhancing additive, and other additives as electrochemically inactive components. The electrode binder ensures the mechanical stability of the layer on the current collector and often also ensures the adhesion of the layer to the current collector. Common conductivity enhancing additives are carbon black, fine graphite, carbon fibers, carbon nanotubes, and metal powders.

[0051] Solutions of lithium salts (eg, lithium hexafluorophosphate (LiPF6)) in organic solvents (eg, ethers and esters of carbonic acid) are particularly suitable as electrolytes for lithium-ion cells.

[0052] Sodium-ion cells are known to be based on the use of sodium, which in the form of ions can migrate back and forth between the electrodes of an energy storage element.

[0053] The following materials may, for example, be considered within the scope of the present invention as electrochemically active components (active materials) for a sodium-ion cell on the anode side: Carbon, in particular hard carbon (pure or with nitrogen and / or phosphorus doping) or soft carbon or graphene-based materials (for example with nitrogen doping), carbon nanotubes, graphite - Polyanions, e.g. Na2Ti3O7, Na3Ti2(PO4)3, TiP2O7, TiNb2O7, Na-Ti-(PO4)3, Na-V-(PO4)3 - Transition metal oxides: V2O5, MnO2, TiO2, Nb2O5, Fe2O3, Na2Ti3O7, NaCrTiO4, Na4Ti5O 12

[0054] On the cathode side, for example, the following materials can be considered: - Polyanions: NaFePO4(Triphylit-Typ), Na2Fe(P2O7), Na4Fe3(PO4)2(P2O7), Na2FePO4F, Na / Na2[Fe 1 / 2 Mn 1 / 2 ]PO4F, Na3V2(PO4)2F3, Na3V2(PO4)3, Na4(CoMnNi)3(PO4)2P2O7, NaCoPO4, Na2CoPO4F - Silicates: Na2MnSiO4, Na2FeSiO4 - Layered oxides: NaCoO2, NaFeO2, NaNiO2, NaCrO2, NaVO2, NaTiO2, Na(FeCo)O2, Na(Ni-FeCo)3O2, Na(NiFeMn)O2, Na(NiFeCoMn)O2, Na(NiMnCo)O2

[0055] Furthermore, preferably, the electrodes of the sodium ion based energy storage element according to the present invention comprise one of the electrode binders and / or conductivity enhancing or other additives mentioned above.

[0056] In the sodium-ion energy storage cell, both the anode and cathode current collectors are preferably made of aluminum or an aluminum alloy.

[0057] Energy storage elements based on sodium ion technology preferably have an electrolyte comprising at least one solvent and at least one conductive salt.

[0058] Organic carbonates, ethers, nitriles, and mixtures thereof are particularly suitable as solvents.

[0059] Preferred lead salts are NaPF6, sodium difluoro(oxalyl)borate (NaBOB), NaBF4, sodium bis(fluorosulfonyl)imide (NaFSl), sodium 2-trifluoromethyl-4,5-dicyanoimidazole (NaTDl), sodium bis(trifluoromethanesulfonyl)imide (NaTFSL), NaAsF6, NaBF4, NaClO4, NaB(C2O4)2, NaP(C6H4O2)3, NaCF3SO3, sodium triflate (NaTf) and Et4NBF4.

[0060] In a preferred embodiment, additives may be added to the electrolyte of the sodium-ion cell. Particularly, examples of preferred additives for stabilization are as follows: fluoroethylene carbonate (FEC), trans-difluoroethylene carbonate (DFEC), ethylene sulfite (ES), vinylene carbonate (VC), bis(2,2,2-trifluoroethyl)ether (BTFE), sodium 2-trifluoromethyl-4,5-dicyanoimidazole (NaTDl), sodium bis(fluorosulfonyl)imide (NaFSl), aluminum chloride (AlCl3), ethylene sulfate (DTD), sodium difluorophosphate (NaPO2F2), sodium difluoro(oxalic acid)borate (NaODFB), sodium difluorobisoxalic acid phosphate (NaDFOP), and tris(trimethylsilyl)borate (TMSB).

[0061] In a preferred embodiment, the energy storage element according to the invention comprises: a. The bent portion of the contact plate metal member, in particular the extension or protruding region protruding from the main portion of the contact plate metal member, is located on the outer periphery of the contact plate metal member, in particular the outer periphery region of the main portion of the contact plate metal member; b. the contact plate metal member comprises at least two, preferably from 2 to 100, particularly preferably 3 or 4, portions, extensions or protruding regions that are bent in the direction of the electrode-separator assembly, in particular on the edge of the side on which the contact plate metal member rests; It is characterized by at least one of the following features.

[0062] A particular advantage of the energy storage element according to the invention is that the bent portion or portions can greatly facilitate the accurate positioning, if necessary the positioning of the contact plate metal element in the center of the end face of the electrode-separator assembly. This is especially true if the contact plate metal element has two or, particularly preferably, three or more bent portions. The bent portions can encourage accurate positioning and ensure that incorrect positioning is avoided. Even if the contact plate metal element is not initially accurately positioned on the end face of the electrode-separator assembly, the contact plate metal element can be aligned with the end face of the electrode-separator assembly by means of the extensions or protruding areas, so that the contact plate metal element is uniform and rests center-positioned on the end face of the electrode-separator assembly. This allows to compensate for manufacturing-related variations in the size and shape of the end face, so that no problems arise during the post-processing of the electrode-separator assembly provided with the contact plate metal element. The accurate positioning of the contact plate metal element positioned on the end face simplifies the subsequent insertion of the electrode-separator assembly into, for example, a cup-shaped housing part. This allows the diameter, or generally the size, of the electrode-separator assembly to be maximized, thereby increasing the energy density of the energy storage element according to the present invention compared to conventional energy storage elements.

[0063] It is further conceivable to bend at least one extension or protruding region in more than one step, for example by subjecting the extension or protruding region to a first bending step (pre-bending) in the direction of the electrode-separator assembly, for example at a bending angle of 30° to 55°, and then subjecting the extension or protruding region to a second bending step in a further step, for example at a bending angle of 60° to 120° in the direction of the electrode-separator assembly.

[0064] In a preferred embodiment, a pre-bending is performed before placing the contact plate metal part on the end face of the electrode-separator assembly, and a further bending is performed after placing the contact plate metal part on the end face of the electrode-separator assembly. The further bending can be performed, for example, when inserting the electrode-separator assembly into the above-mentioned cup-shaped housing part with corresponding contact with the interior of the cup-shaped housing part during insertion.

[0065] The contact plate metal member may have two extensions or protruding regions if the bending process results in different bending results. For example, one extension or protruding region may be bent at a larger bending angle than another. This may be done, for example, if the contact plate metal member is not positioned exactly in the center of the end face of the electrode-separator assembly. When inserting the electrode-separator assembly into the housing part, one extension may be bent more than another extension.

[0066] The measures according to the invention also allow for improved scrap rates when forming welded joints between the electrode-separator assembly and the contact plate metal members.

[0067] The particular advantages of the solution according to the invention are particularly useful for energy storage elements having an electrode-separator assembly and a cylindrical housing, since the positioning of the contact plate metal element in the center of the end face of the cylindrical electrode-separator assembly causes particular difficulties in the manufacturing process. Nevertheless, the advantages of the solution according to the invention can also be used for energy storage elements having a prismatic housing and a prismatic electrode-separator assembly.

[0068] In a particularly preferred embodiment of the energy storage element according to the invention, the contact plate metal member has a. the contact plate metal member has said main portion from which an extension or protruding region protrudes, or from which a plurality of extensions or a plurality of protruding regions protrude; b. the main portion has at least one circular or one straight outer edge from which the extension or protruding area or areas protrude; c. The maximum extension length of the main portion of the contact plate metal member is shorter than the maximum extension length of the side of the electrode-separator assembly on which the contact plate metal member rests. and designed according to at least one of the following additional features:

[0069] The shape and size of the main part of the contact plate metal part is appropriately adapted to the shape and size of the side of the electrode-separator assembly on which it rests, since the contact plate metal part should be in contact with the edge of the current collector protruding from the side over as long as possible. In the case of an electrode-separator assembly in the form of a cylindrical winding, in a preferred embodiment the contact plate metal part has a disk-shaped main part with a circular outer edge, for example to correspond to the shape of the end face to be covered. If the electrode-separator assembly is a prismatic winding or comprises, for example, a prismatic electrode stack, and the side to be covered by the main part has a polygonal base, the contact plate metal part preferably has a polygonal main part.

[0070] Particularly preferably, the outer edge of the main part is, in the case of a cylindrical winding, a circumferential edge, particularly preferably a circular circumferential edge.

[0071] The maximum extension length of the main part of a contact plate metal member is defined as the greatest distance between any two points on the outer edge of the main part.

[0072] The maximum extension length of a side of an electrode-separator assembly on which a contact plate metal member rests is defined as the greatest distance between two points on the edge or edges that define the side.

[0073] In a particularly preferred embodiment of the energy storage element according to the invention, the energy storage element comprises a. at least one bent portion has a rectangular or strip shape; b. at least one bent portion has a triangular shape; c. at least one bent portion has a semicircular profile or includes a circular end, particularly an end having a semicircular profile; d. the contact plate metal member includes several bent portions between which recesses, in particular notched recesses, are provided; e. the contact plate metal member includes several bent portions with notches therebetween; f. the contact plate metal member includes a plurality of bent portions, the bent portions protruding from at least one outer edge of the main portion at regular intervals; At least one of the additional features is characterized by at least one bent portion of the contact plate metal member.

[0074] The bent portion can have various shapes and configurations. Rectangular or triangular shapes according to features a. or b. above are particularly preferred.

[0075] If there are several bends, they are preferably equally spaced and distributed over the entire outer edge of the main part. The bends can also adjoin each other. If the bends adjoin each other directly, cut-out or embossed recesses may be provided between the bends according to the above-mentioned features d. or e.

[0076] At least one bent portion, preferably at least two bent portions, are made of the same material as the main part. In theory, the bent portions can be manufactured separately and fixed to the main part. However, it is much easier to manufacture the contact plate metal part in one piece including the extensions or protruding areas, for example as a stamped part. The stamping die is then preferably designed so that the contact plate metal part including the extensions can be stamped out of the plate in a single operation. The bending, which will be described in more detail below, can then preferably be carried out later.

[0077] With regard to the at least one extension or protruding region, preferably the energy storage element according to the invention has At least one extension or protruding area protrudes from the outer edge of the main portion by at least 0.1 mm and at most 1 mm It is characterized by the additional feature that:

[0078] Particularly preferably, at least one extension or protruding region protrudes from the outer edge of the main portion by at least 0.1 mm and at most 0.5 mm.

[0079] Preferably, the given preferred values ​​refer to the state of the contact plate metal member in which at least one extension or protruding region has not yet been bent.

[0080] In view of the above-mentioned advantages of the measures according to the invention, even very short lengths of the extensions or protruding regions of the contact plate metal parts, i.e. in particular in the region of less than 1 mm, are sufficient. In some preferred embodiments, the length of the extensions can be selected such that after bending, the extensions or protruding regions are in exclusive contact with the uncoated longitudinal edges of the current collector or collectors to which the contact plate metal parts are welded. However, the length can also be selected such that the extensions or protruding regions extend into the regions of the current collectors that are coated with electrode material.

[0081] Preferably, the maximum projection of at least one extension or protruding region starting from an outer edge of the main part is less than the minimum distance of the main part from the end face from which the outer edge or edges protrude.

[0082] In a preferred embodiment of the energy storage element according to the invention, the contact plate metal member has a. The contact plate metal member preferably has a uniform thickness in the range of 50 μm to 600 μm, particularly in the range of 100 μm to 500 μm (preferably 200 μm or 300 μm). It is characterized by the additional feature that:

[0083] A contact plate metal member thickness of 200 μm is particularly suitable for contacting an anode or negative electrode, and a contact plate metal member thickness of 300 μm is particularly suitable for contacting a cathode or positive electrode.

[0084] In a particularly preferred embodiment of the energy storage element according to the invention, the contact plate metal member has a. the contact plate metal member has at least one bead formed as an elongated depression on one flat side of the contact plate metal member and as an elongated ridge on the opposite flat side, the contact plate metal member facing the electrode-separator assembly having the flat side with the elongated ridge; It is characterized by the additional feature that:

[0085] Furthermore, in a preferred embodiment, the energy storage element according to the invention comprises a. the contact plate metal member is welded to the electrode-separator assembly in the area of ​​at least one bead; b. The weld is straight; c. The weld is formed by two or more parallel weld lines per bead The present invention may be characterized by at least one of the following additional features:

[0086] Preferably, the above-mentioned features a. and b., and particularly preferably, the above-mentioned features a. to c. are realized in combination with one another.

[0087] Welding the contact plate metal member to the electrode-separator assembly in the region of at least one bead generally further improves the stability of the weld and the weld contact with the electrode. Preferably, the contact plate metal member has two or more beads.

[0088] The bead may exclude a central region of the contact plate metal member. In a preferred embodiment, an opening, for example in the form of a circular hole, may be provided in the central region of the contact plate metal member. This opening in the contact plate metal member may be used to fill with electrolyte liquid.

[0089] In some embodiments, it has been found to be advantageous to subject the longitudinal edge of each current collector protruding from the end face of the electrode-separator assembly to a pretreatment before placing the contact plate metal member thereon. In particular, at least one recess corresponding to at least one bead or elongated ridge on the flat side of the contact plate metal member facing the electrode-separator assembly can be folded into the longitudinal edge.

[0090] The longitudinal edges of the current collector may be subjected to directional shaping by pre-treatment, for example the longitudinal edges may be bent in a predefined direction.

[0091] In a particularly preferred embodiment of the energy storage element according to the invention, the contact plate metal member has a. The contact plate metal member has at least one extension or protruding region adjacent to the bead region It is characterized by the additional feature that:

[0092] This embodiment has the advantage that the extensions or protruding regions can be bent in a particularly simple manner: since the bead forms a groove-like recess in the flat side of the contact plate metal part facing away from the electrode-separator assembly, the adjacent extensions or protruding regions are also at a lower level than other areas of the contact plate metal part. This provides a target bending line for bending the extensions or protruding regions, making the bending easier.

[0093] Preferably, the contact plate metal member has at least one extension or protruding area configured as an extension to the bead.

[0094] The contact plate metal member can be electrically connected to the anode current collector or the cathode current collector of the energy storage element. As described in (Patent Document 1), the use of the contact plate metal member has the advantage that the electrodes are in contact with the contact plate metal member along each longitudinal edge of the electrode. This generally reduces the internal resistance of the energy storage element, so that it can absorb larger current events much better than conventional energy storage elements.

[0095] In particular in lithium ion cells, the contact plate metal member provided for electrical connection to the anode current collector of the electrode-separator assembly is a. the contact plate metal components are made of nickel or copper or titanium, or nickel or copper or titanium alloys, for example stainless steel of type 1.4303 or 1.4404 or type SUS304, or nickel-plated copper; b. The contact plate metal member and the anode current collector are made of the same material. At least one of the above features may be included.

[0096] In particular in lithium ion cells, the contact plate metal member provided for electrical connection to the cathode current collector of the electrode-separator assembly is a. The contact plate metal member is made of aluminum or an aluminum alloy; b. The contact plate metal member and the cathode current collector are made of the same material. It is preferable that the present invention has at least one of the following characteristics.

[0097] Suitable aluminum alloys for the contact plate metal components include, for example, aluminum alloys of types 1235, 1050, 1060, 1070, 3003, 5052, Mg3, Mg212 (3000 series) and GM55. AlSi, AlCuTi, AlMgSi, AlSiMg, AlSiCu, AlCuTiMg and AlMg are also suitable. The aluminum content of these alloys is preferably greater than 99.5%.

[0098] Furthermore, the contact plate metal member is a. the contact plate metal member has two opposing flat sides and extends essentially in only one dimension; b. The contact plate metal member is a disk or a polygonal plate; c. The contact plate metal member is dimensioned to cover at least 40%, preferably at least 50%, preferably at least 60%, preferably at least 70%, particularly preferably at least 80% of the end surface of the electrode-separator assembly on which it rests. At least one of the above features may be included.

[0099] Preferably, the above-mentioned features a. and b. or a. and c. or b. and c., particularly preferably the immediately above-mentioned features a. to c. are realized in combination with one another.

[0100] Covering the end faces of the energy storage element with the contact plate metal over as large an area as possible is advantageous for the thermal management of the energy storage element according to the invention. The larger the coverage, the easier it is to contact the longest possible portion of each electrode. Heat generated in the electrode-separator assembly can therefore be dissipated particularly well through the contact plate metal to the housing.

[0101] Preferably, the housing is formed from a cup-shaped metal housing part and a lid part, which are at least partially made of metal. The cup-shaped housing part can be formed, for example, by deep drawing. However, it is also possible to manufacture the cup-shaped housing part by welding the bottom part to the tubular housing part. The two housing parts can be connected via a seal, which has electrically insulating properties and electrically insulates the two housing parts from each other. The two housing parts can also be joined by welding. In this case, a metal rod, which is preferably insulated from the housing, is led out through an opening in the housing.

[0102] The electrical and thermal contact of the electrode with the housing or with one of the housing parts is effected via a contact plate metal part, which itself can be electrically connected to the housing part or to a metal bar, for example, via a current conductor or direct welding.

[0103] The housing part can consist of aluminum, aluminum alloys or steel sheet (e.g. nickel-plated steel sheet). Suitable aluminum alloys for the cup-shaped metal housing part are, for example, aluminum alloys of types 1235, 1050, 1060, 1070, 3003, 5052, Mg3, Mg212 (3000 series) and GM55. AlSi, AlCuTi, AlMgSi, AlSiMg, AlSiCu, AlCuTiMg and AlMg are also suitable. The aluminum content of these alloys is preferably greater than 99.5%.

[0104] The present invention further provides a method for producing an electrochemical energy storage element as described, comprising the steps of: a. providing an electrode-separator assembly (104) having at least one side defined by a perimeter or edge; b. placing a contact plate metal member (110) on this side of the electrode-separator assembly, the contact plate metal member having at least one extension or protruding area (120); c. bending at least one extension or protruding region (120) towards the electrode-separator assembly, in particular over one or more edges defining the sides; d. before or after bending at least one extension or protruding region (120), connecting the contact plate metal member (130) to the electrode-separator assembly in the region of its end faces by welding; e. Providing a cup-shaped housing portion (101) and a lid portion (102) having an opening for housing an energy storage element; f. inserting the electrode-separator assembly (104) having a contact plate metal member (110) into the cup-shaped housing portion (101); g. Closing the opening of the cup-shaped housing portion (101) with a lid portion (102); h. before and / or after closing the opening of the cup-shaped housing portion with the lid, placing the electrodes of the electrode-separator assembly (104) in electrical contact with the housing portion and / or the rod bushing; The present invention includes a method comprising the steps of:

[0105] All functional parts used in the method have already been described in connection with the energy storage element according to the invention, reference is hereby made to the corresponding description.

[0106] In the method for manufacturing an energy storage element according to the invention, preferably, the contact plate metal member in step a. is first placed on the side of the electrode-separator assembly such that at least one extension or protruding area of ​​the contact plate metal member protrudes beyond one or more edges defining the side. In a further step, the at least one extension or protruding area is bent in the direction of the electrode-separator assembly, so that the at least one extension or protruding area is used to grip around the side of the electrode-separator assembly on which the contact plate metal member rests. Ideally, the at least one extension or protruding area is bent in such a way that it is at an angle of 90 degrees to the main part of the contact plate metal member. Inserting the electrode-separator assembly into the cup-shaped housing part using such a contact plate metal member is significantly easier than with conventional methods.

[0107] Furthermore, the gripping has the advantage that the outer current collector edge can no longer be pushed past the contact plate metal part.

[0108] Either before or after bending, the contact plate metal member may be welded to one or more edges of the current collector that protrude from the side of the electrode-separator assembly on which the contact plate metal member rests.

[0109] As an alternative to step c. above, which involves bending at least one extension or protruding region towards the electrode-separator assembly, the at least one extension or protruding region can also be bent before the contact plate metal member is positioned on the end face of the electrode-separator assembly.

[0110] The cup-shaped housing part can be closed with the lid part according to step g. above in a manner known per se, for example by welding, in particular laser welding, or possibly by crimping or gluing.

[0111] The electrolyte can be added to the electrode-separator assembly before or after closing the opening of the cup-shaped housing part with the lid. For this purpose, for example, an opening can be provided in the bottom of the cup-shaped housing part for introducing the electrolyte into the interior of the housing. This activation opening can then be reclosed with a washer or the like, or for example by gluing or welding.

[0112] In a particularly preferred embodiment of the method according to the invention, the electrode-separator assembly with the contact plate metal member is inserted into the cup-shaped housing part so that the contact plate metal member is in direct contact with the bottom of the cup-shaped housing part. The cup-shaped housing part is often electrically connected to the positive electrode and therefore has a negative polarity. The contact plate metal member with the bent extension serves as an insertion aid and makes the assembly easier. In a later step, the bottom and the contact plate metal member can be joined by welding.

[0113] Furthermore, the use of a contact plate metal member on the cathode side can be advantageous.

[0114] To improve positioning and fixing of the contact plate metal members to each end surface of the electrode-separator assembly, a weld (e.g., a laser line) can be directed to the outer regions of each end surface of the electrode-separator assembly, so that the outer layers of the electrode-separator assembly can also be better connected. [Brief description of the drawings]

[0115] Further features and advantages of the invention will become apparent from the following description of preferred embodiments taken in conjunction with the drawings. As shown in the drawing below. [Figure 1] 1 is a schematic longitudinal section through a preferred embodiment of an energy storage element according to the invention; [Diagram 2] 1A and 1B show two preferred embodiments of a contact plate metal component according to the invention (partial views A and B). [Diagram 3] 3A and 3B show two further preferred embodiments of the contact plate metal part according to the invention (parts A and B). [Figure 4] 2 is a schematic cross-sectional view illustrating the connection of a contact plate metal member to an electrode-separator assembly according to the present invention. [Diagram 5] For example, an energy storage element as shown in FIG. 1 and an electrode-separator assembly that can be installed in a component of the energy storage element. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0116] In the embodiment of an energy storage element according to the invention shown in Figure 1, the energy storage element 100 comprises a housing essentially formed by a cup-shaped housing part 101 and a lid part 102. The cup-shaped housing part 101 has a circular opening at the top of the embodiment which is closed by the lid part 102. An electrically insulating seal 103 is provided between the edge of the opening of the cup-shaped housing part 101 and the lid part 102, electrically insulating the housing parts 101 and 102 from each other and sealing the housing.

[0117] Inside the housing there is a wound electrode-separator assembly 104, which is a cylindrical winding of a spirally wound ribbon-shaped electrode and at least one ribbon-shaped separator. The electrodes are composite electrodes each formed from a ribbon-shaped current collector coated with an electrode material. The electrode-separator assembly 104 has an upper end surface facing the lid portion 102 and a lower end surface facing the bottom of the housing portion 101. The free longitudinal edges 106a or 109a of the current collectors included by the electrodes not coated with the current collector electrode material protrude from each of these current collectors. For example, the free longitudinal edge 106a of the anode current collector may protrude from the lower end surface and the free longitudinal edge 109a of the cathode current collector may protrude from the upper end surface of the electrode-separator assembly. The layers of electrode material and the separator ribbons arranged between the electrodes are not shown in this illustration.

[0118] In a preferred embodiment, a contact plate metal member 110 is provided on each of the two end faces of the electrode-separator assembly 104. In other embodiments, for example, a contact plate metal member may be provided on only the top end face or only the bottom end face.

[0119] The contact plate metal members 110 are each electrically connected to a free longitudinal edge 106a or 109a of the current collector protruding from each end face. The free longitudinal edge 106a or 109a of the current collector is in direct contact with the respective contact plate metal member 110 over its entire length and is connected to the contact plate metal member 110 by welding.

[0120] The contact plate metal element 110 welded to the free longitudinal edge 106a of the anode current collector rests directly on the bottom of the cup-shaped housing part 101 and is assembled to the free longitudinal edge 106a by welding. The contact plate metal element 110 welded to the free longitudinal edge 109a of the cathode current collector is in electrical contact with the lid part 102 via a conductor 117. Preferably, the conductor 117 is connected to both the lid part 102 and the bottom of the cup-shaped housing part 101 by welding.

[0121] The lid portion 102 is electrically isolated from the cup-shaped housing portion 101 by an insulating seal 103 such that the cup-shaped housing portion 101 forms the negative electrode and the lid portion 102 forms the positive electrode of the energy storage element 100 .

[0122] The exemplary design of the energy storage element 100 can be transferred in a similar manner to cells having prismatic housings and, for example, flat-wound or stacked electrode-separator assemblies.

[0123] The energy storage element 100 according to the invention differs from conventional energy storage elements in which contact plates or contact plate metal members are provided by the design of the contact plate metal members 110. According to the invention, these contact plate metal members are provided with a number of extensions 120 each bent in the direction of the electrode-separator assembly 104, so that the contact plate metal members 110 surround with their bent extensions the two end faces of the electrode-separator assembly 104 on which they rest. In the illustrated embodiment, both contact plate metal members 110 include the bent extensions 120.

[0124] The bending of the extensions 120 occurs during the manufacturing process of the energy storage element 100. Preferably, after the contact plate metal members 110 are placed, the extensions 120 are pressed against each end face of the electrode-separator assembly 104. The bending can occur before or after the contact plate metal members 110 are welded to the free longitudinal edges 106a and 109a of the current collectors.

[0125] 2 shows in partial views A and B two exemplary embodiments of a contact plate metal member 110 according to the present invention. Both embodiments have a main portion 155 defined by a circular outer edge 111 from which an extension 120 projects. Such a contact plate metal member 110 is suitable for placing, for example, on an end face of an electrode-separator assembly as shown in FIG.

[0126] In these examples, the extensions 120 are each arranged along the entire outer edge 111 of the contact plate metal member 110. In the example according to partial view A, a cutout recess is provided between adjacent extensions 120. In the example according to partial view B, a cutout is provided between each individual extension 120.

[0127] The contact plate metal member 110 is a stamped portion.

[0128] The contact plate metal members 110 each have three beads 130 arranged in a star shape. On the flat side of the contact plate metal member 110 provided for contacting the electrode-separator assembly, the beads 130 each appear as a bump. On the side of the contact plate metal member 110 facing away from the electrode-separator assembly, the beads 130 each appear as an elongated depression. The beads 130 can be produced, for example, by embossing.

[0129] Preferably, the contact plate metal member 110 is welded to each free longitudinal edge of the current collector in the region of the bead 130, for example by one, two or more parallel weld lines 131 within the bead 130.

[0130] 3 shows in partial views A and B two further particularly preferred embodiments of a contact plate metal part 110 according to the invention. In partial view A, the contact plate metal part 110 is shown with three extensions 120, each of which is an extension of one of three star-arranged beads 130. The embodiment of the contact plate metal part 110 shown in partial view B is similar, although in this example it provides four beads 130, each of which surrounds another bead 130 by an angle of 90 degrees.

[0131] The configuration of the extension 120 as an extension of the bead 130 has proven to be particularly advantageous in practice: the extension is at a lower level than the remainder of the contact plate metal part 120. This allows the extension 120 to be easily bent.

[0132] The embodiment of the contact plate metal member 110 according to part B of Fig. 3 is particularly preferred, since with this embodiment a particularly accurate positioning of the contact plate metal member 110 on each end face of the electrode-separator assembly can be achieved.

[0133] The embodiments of contact plate metal members 110 shown in partial views A and B of Figure 3 each have a central opening in the form of a hole 140. This opening 140 can be used to impregnate the electrode-separator assembly with electrolyte after the contact plate metal members 110 have been installed and welded.

[0134] 4 shows a cross-section through the contact plate metal part 110 according to the invention, corresponding to FIG. 3, forming the (not yet bent) extension 120 as an extension of the bead 130. The extension 120 is located at a lower level than the rest of the contact plate metal part 110 outside the bead 130.

[0135] Further, the electrode-separator assembly 104 is shown on one end face on which the contact plate metal member 110 is placed. Preferably, after the contact plate metal member 110 is placed on the end face of the electrode-separator assembly 104, the extensions 120 are bent downwards so as to orient the extensions 120 towards the electrode-separator assembly 104. The bent extensions 120 grip around the edge regions of each end face. On the one hand, this ensures the correct positioning of the contact plate metal member 110 on the end face. On the other hand, this facilitates the insertion of the electrode-separator assembly 104 with the contact plate metal member 110 into the cup-like or tubular housing part. The contact plate metal member 110 performs the function of assisting the insertion.

[0136] FIG. 5 illustrates the structure of an electrode-separator assembly 104 that can be a component of an energy storage element according to the invention. The assembly 104 includes a ribbon-shaped anode 105 having a ribbon-shaped anode current collector 106 with a first longitudinal edge 106a and a second longitudinal edge parallel to the first longitudinal edge. The anode current collector 106 is a foil made of copper or nickel. It includes a strip-shaped main area on which a layer of negative electrode material 107 is applied, and a free edge strip 106b extending along the first longitudinal edge 106a and on which no electrode material 107 is applied. Furthermore, the assembly 104 includes a ribbon-shaped cathode 108 having a ribbon-shaped cathode current collector 109 with a first longitudinal edge 109a and a second longitudinal edge parallel to the first longitudinal edge. The cathode current collector 109 is an aluminum foil. It includes a strip-shaped main region having a layer of positive electrode material 110 applied thereto, and a free edge strip 109b extending along a first longitudinal edge 109a and not having any applied electrode material 110. Both electrodes are shown individually in their unrolled state.

[0137] The anode 105 and cathode 108 are offset from one another within the electrode-separator assembly 104 such that a first longitudinal edge 106a of the anode current collector 106 protrudes from the first end face 104a and a first longitudinal edge 109a of the cathode current collector 109 protrudes from the second end face 104b of the electrode-separator assembly 104. The offset arrangement is seen illustratively at the bottom left. Two ribbon-like separators 156 and 157 that separate the electrodes 105 and 108 from one another in the windings are also shown at the bottom left.

[0138] In the illustration at the bottom right, the electrode-separator assembly 104 is shown in a rolled form so that it can be used in an energy storage element according to Fig. 1. The electrode edges 106a and 109a protruding from the end faces 104a and 104b are clearly visible. The rolled shell 104c is formed by a plastic film.

Claims

1. An electrochemical energy storage element (100), comprising: a. the electrochemical energy storage device includes a housing; b. an electrode-separator assembly (104) is disposed within said housing; c. the electrode-separator assembly (104) includes a side defined by a peripheral edge or multiple edges; d. A contact plate metal member (110) rests on said side of said electrode-separator assembly (104) and is connected to said electrode-separator assembly (104) in the region of said side by welding. It has the following characteristics: e. said contact plate metal member (110) includes at least one portion (120) that is bent toward said electrode-separator assembly (104), in particular on said edge defining said side or on one of said edges defining said side; An electrochemical energy storage element (100).

2. a. the at least one portion of the contact plate metal member (110) that is bent in the direction of the electrode-separator assembly (104), particularly over the edge that defines an end face, is at least one extension or protruding region that protrudes from a main portion of the contact plate metal member that rests on the end face; Electrochemical energy storage element according to claim 1 , having the additional feature:

3. a. the electrode-separator assembly (104) is formed by spirally wound electrode ribbons having at least one separator ribbon between the spirally wound electrode ribbons, the electrode-separator assembly having first and second end faces and a wound shell between the end faces, one of the end faces being defined by the periphery and being the side of the electrode-separator assembly on which the contact plate metal member (110) rests; b. the electrode ribbon is formed by a ribbon-shaped current collector coated with an electrode material; c) at least one of the ribbon-shaped current collectors has a longitudinal edge (106a, 106b) that is not covered with electrode material, the electrode ribbon being positioned within the electrode-separator assembly (104) such that the longitudinal edge that is not covered with electrode material protrudes beyond the end face of the electrode-separator assembly on which the contact plate metal member (110) rests; d. The contact plate metal member (110) is welded to the longitudinal edge protruding from the end face.

3. An electrochemical energy storage element according to claim 1 or 2, having at least one of the following additional features:

4. a. the electrode-separator assembly (104) is formed by stacked electrodes with layers of separator or solid electrolyte disposed therebetween; b. the electrode is formed by a current collector coated with an electrode material; c. the current collectors of the positive and / or negative electrodes each have a current collector edge that is not covered with electrode material, and the electrodes are arranged in the stack such that the entire current collector edge of the positive or negative electrode that is not covered with electrode material protrudes from one side of the electrode-separator assembly, this side being the side of the electrode-separator assembly on which the contact plate metal member (110) rests; d. The contact plate metal member (110) is welded to the edge of the current collector protruding from this side.

3. An electrochemical energy storage element according to claim 1 or 2, having at least one of the following additional features:

5. a. the at least one bent portion (120) of the contact plate metal member (110) is provided on the outer periphery of the contact plate metal member (110), in particular in the area of ​​the outer periphery of the main portion of the contact plate metal member (110); b. The contact plate metal member (110) comprises at least two, preferably from two to one hundred, particularly preferably three or four, portions, extensions or protruding regions that are bent in the direction of the electrode-separator assembly (104), in particular on the edge of the side on which the contact plate metal member (110) rests. Electrochemical energy storage element according to any one of claims 1 to 4, having at least one of the following additional features:

6. a. the contact plate metal member has the main portion from which the extension or protruding region protrudes, or from which the plurality of extensions or protruding regions protrude; b. said main portion having at least one circular or one straight outer edge from which said extension or protruding region protrudes; c) the maximum extension length of said main portion of said contact plate metal member is less than the maximum extension length of said side of said electrode-separator assembly on which said contact plate metal member rests; 6. The electrochemical energy storage element according to claim 5, comprising at least one of the following additional features:

7. a. the at least one bent portion (120) has a rectangular or strip shape; b. said at least one bent portion (120) has a triangular shape; c. the at least one bent portion (120) has a semicircular profile or includes a circular end, preferably an end having a semicircular profile; d. the contact plate metal member includes a plurality of bent portions (120) having recesses therebetween, in particular notch recesses; e. the contact plate metal member includes a plurality of bent portions (120) having notches therebetween; f. The contact plate metal member includes a plurality of bent portions (120), the bent portions (120) protruding from the at least one outer edge of the main portion at regular intervals. Electrochemical energy storage element according to any one of claims 1 to 6, comprising at least one of the following additional features:

8. a. said at least one extension or protruding region (120) protrudes from said outer edge of said main portion by at least 0.1 mm and at most 1 mm; Electrochemical energy storage element according to any one of claims 1 to 7, having the additional characteristic that:

9. a. The contact plate metal member (110) has a thickness in the range of 50 μm to 600 μm, in particular in the range of 100 μm to 500 μm, preferably 200 μm or 300 μm. Electrochemical energy storage element according to any one of claims 1 to 8, having the additional characteristic that:

10. a. the contact plate metal member (110) has at least one bead (130) formed as an elongated depression on one flat side of the contact plate metal member and as an elongated ridge on the opposite flat side, the contact plate metal member facing the electrode-separator assembly (104) with the flat side bearing the elongated ridge; Electrochemical energy storage element according to any one of claims 1 to 9, having the additional characteristic that:

11. a. said contact plate metal member (110) is welded to said electrode-separator assembly in the area of ​​said at least one bead (130); b. the weld is a straight line; c. The weld is formed by two parallel weld lines (131) per bead (130). Electrochemical energy storage element according to any one of claims 1 to 10, having at least one of the following additional features:

12. a. said contact plate metal member having at least one extension (120) or protruding region adjacent said region of the bead (130); Electrochemical energy storage element according to any one of claims 1 to 11, having the additional feature that:

13. A method for producing an electrochemical energy storage element (100) according to any one of claims 1 to 12, comprising the steps of: a. providing an electrode-separator assembly (104) having at least one side defined by a perimeter or multiple edges; b. placing a contact plate metal member (110) on this side of said electrode-separator assembly, said contact plate metal member having at least one extension or protruding area (120); c. bending said at least one extension or protruding region (120) towards said electrode-separator assembly, in particular over said edge or edges defining said side; d. before or after bending said at least one extension or protruding region (120), connecting said contact plate metal member (130) to said electrode-separator assembly in the region of its end faces by welding; e. Providing a cup-shaped housing part (101) and a lid part (102) with an opening for housing the energy storage element; f. Inserting the electrode-separator assembly (104) with the contact plate metal member (110) into the cup-shaped housing portion (101); g. closing the opening of the cup-shaped housing portion (101) with the lid portion (102); h. before and / or after closing the opening of the cup-shaped housing portion with the lid, placing the electrodes of the electrode-separator assembly (104) in electrical contact with portions of the housing and / or rod bushings; The method includes:

14. a. Adding electrolyte to the electrode-separator assembly (104) either before or after closing the opening of the cup-shaped housing portion (101) with the lid portion (102). The method of claim 13 including additional method steps.

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