Electrochemical cell, method for producing an electrochemical cell, electrochemical system and method for producing an electrochemical system

Description

[0001] The present invention relates to an electrochemical cell, a method for manufacturing an electrochemical cell, an electrochemical system and a method for manufacturing an electrochemical system.

[0002] A bursting device should be as simple to manufacture as possible and allow for controlled opening in the event of overpressure. Within the electrochemical cell, there is a risk of overcharging, which releases fluid from the cell's interior. This leads, in particular, to a pressure increase within the cell. Specifically, there is a risk of self-reinforcing heat generation and overheating of the electrochemical cell or adjacent cells, which can result in an explosive ignition (a so-called "thermal runaway").

[0003] To control a so-called "thermal runaway" or other thermal event, pressure equalization with the environment of the electrochemical cell can be carried out using the bursting device.

[0004] Document US 2005 / 0069760 A1 describes a dense rectangular battery.

[0005] The present invention relates to an electrochemical cell and a method for manufacturing an electrochemical cell.

[0006] The present invention relates to an electrochemical system and a method for producing an electrochemical system.

[0007] The present invention is based on the objective of providing an electrochemical cell which is as easy to manufacture as possible and in which, in the event of overpressure in an interior space of the electrochemical cell, fluid can flow out of the interior space.

[0008] This problem is solved by an electrochemical cell comprising a housing surrounding an interior of the electrochemical cell and a bursting device, wherein the bursting device is arranged on a wall of the housing and is in particular formed integrally with the wall.

[0009] The bursting device comprises at least one bursting rib. The at least one bursting rib has a thickness that varies in the longitudinal direction and is formed by at least one first recess, which is arranged on an inner side of the wall facing the interior, and at least one second recess, which is arranged on an outer side of the wall facing away from the interior.

[0010] The electrochemical cell is particularly suitable for use in a vehicle.

[0011] For example, the electrochemical cell is a lithium-ion battery and / or a lithium-ion accumulator.

[0012] Particularly in embodiments in which the at least one bursting bridge is curved or arched, the longitudinal direction is preferably a circumferential direction.

[0013] The wall is preferably formed by a wall component. For example, the wall component is a cover element of the electrochemical cell.

[0014] The at least one burst bridge is formed by embossing, in particular by embossing an unprocessed area of ​​the wall.

[0015] The embossing process preferably allows for the targeted insertion of at least one bursting rib. This makes it possible, in particular, to adjust the bursting behavior of the bursting device.

[0016] For example, a burst pressure can be set by selecting an indentation depth and / or a length of the at least one bursting bridge, when this pressure is exceeded a part of the at least one bursting bridge or the at least one bursting bridge as a whole breaks and / or tears.

[0017] The burst pressure is preferably identical to the critical pressure in the interior of the electrochemical cell.

[0018] For example, the at least one first depression and the at least one second depression are formed by pressing into a solid material of the wall from both sides.

[0019] It can be advantageous if at least one first indentation and / or at least one second indentation has a bottom area in which the indentation depth of the respective indentation is at its maximum.

[0020] It can be advantageous if the bursting device is arranged and / or designed in such a way that the at least one bursting bridge partially or completely breaks and / or tears when a critical pressure and / or a critical temperature is exceeded in the interior of the electrochemical cell, depending on its thickness, thereby causing the bursting device to move from a closed to an open state.

[0021] In a closed state of the bursting device, the at least one bursting bridge preferably connects a bursting surface surrounded by the at least one bursting bridge and an area of ​​the wall component surrounding the at least one bursting bridge in a fluid-tight manner.

[0022] In the open state of the bursting device, the bursting surface surrounded by the at least one bursting rib is preferably pushed away from the interior and / or unfolded outwards.

[0023] It can be advantageous if the at least one bursting bridge, which has a longitudinally varying thickness, is formed by a depression located on the inner side of the electrochemical cell wall facing the interior, and in particular, if it is pressed into the wall. The depression is preferably a first depression.

[0024] The bursting device of the electrochemical cell preferably has one or more features described below in connection with the bursting device disclosed herein and / or one or more of the advantages described below in connection with the bursting device disclosed herein: The bursting device comprises a wall component having at least one bursting rib. The at least one bursting rib has a thickness that varies in the longitudinal direction. The at least one bursting rib is formed by at least one first depression located on a first side of the wall component and at least one second depression located on a second side of the wall component opposite the first side. The bursting device is suitable, for example, for use in an electrochemical system, such as an electrochemical cell of an electrochemical system. Preferably, part or all of the at least one bursting rib forms a predetermined breaking point. The at least one predetermined breaking point is, for example, a material weak point formed by the at least one first depression and / or the at least one second depression.Particularly in embodiments where the at least one bursting rib is angled or curved, the longitudinal direction is preferably a circumferential direction of the at least one bursting rib. Preferably, the at least one bursting rib defines a bursting path. In particular, the at least one bursting rib has a varying material thickness along the direction of the bursting path. The at least one bursting rib is preferably cord-shaped and / or linear. This allows the bursting behavior of the bursting device to be defined as precisely as possible. In particular, a bursting device with reproducible bursting behavior can be designed in this way. For easier handling during assembly and / or for the manufacture of the bursting device, it can be advantageous if the at least one bursting rib is spaced apart from an outer edge of a region of the wall component surrounding the at least one bursting rib.The area of ​​the wall component surrounding the at least one rupture rib is preferably a base body of the wall component. The at least one first recess and the at least one second recess are preferably recesses on both sides and / or arranged on opposite sides of the wall component. Preferably, the first side is an underside and / or an inner side facing the interior of the container when the rupture device is installed. The second side of the wall component is preferably an upper side of the wall component and / or an outer side facing away from the interior of the container when the rupture device is installed. It can be advantageous if the at least one rupture rib is formed by embossing the wall component. In particular, the at least one first recess and / or the at least one second recess are formed by embossing.By embossing, particularly into a solid material without pre-machining, a bursting device with a defined geometry can be produced. Specifically, the at least one first depression and / or the at least one second depression form embossed recesses and / or are created in a solid material. Preferably, the wall component is embossed exclusively in the area of ​​the at least one first depression and / or the at least one second depression. Embossing minimizes the volume of material that needs to be displaced. In particular, machining of larger areas of the wall component is unnecessary. Preferably, embossing the wall component can form a bursting membrane that is integral with the area of ​​the wall component surrounding the at least one bursting rib.Complex assembly processes for a separately manufactured rupture membrane, such as welding in a separate rupture membrane, are particularly unnecessary due to the one-piece and / or single-piece design of the rupture device. It can be advantageous if the at least one first recess and / or the at least one second recess are and / or are incorporated into unmachined areas of the wall component. The wall component preferably comprises a metallic material, for example, aluminum, or is formed from a metallic material, for example, aluminum. It can be advantageous if the at least one rupture rib has a closed shape in a cross-section parallel to a principal extension plane of the wall component, the extent of which in one spatial direction is, for example, by a factor of 2 or more, greater than in a spatial direction perpendicular to it.For example, the at least one rupture bridge is asymmetrically designed in a top view. In embodiments in which the wall component as a whole has a curvature, features defined by a relationship to the principal extension plane of the wall component preferably refer to a plane arranged perpendicular to a normal of the wall component. According to a preferred embodiment, the at least one rupture bridge is at least approximately oval or at least approximately rectangular in a cross-section taken parallel to the principal extension plane of the wall component. For example, the at least one rupture bridge is stadium-shaped in a cross-section taken parallel to the principal extension plane of the wall component. Alternatively, other shapes of the at least one rupture bridge are also conceivable, for example, further polygonal shapes.It can be advantageous if the depressions in the area of ​​the at least one bursting rib taper towards the central plane of the wall component in directions perpendicular to the main extension plane of the wall component, particularly on both sides. It can also be advantageous if the at least one first depression and / or the at least one second depression, in a cross-section taken perpendicular to the main extension plane of the wall component, are at least approximately triangular, in the form of an isosceles trapezoid, or circular arc-shaped, for example, U-shaped. For example, the at least one first depression and / or the at least one second depression are formed in the form of an isosceles triangle and / or at least approximately V-shaped.As an alternative to the aforementioned shapes, the at least one first depression and / or the at least one second depression can be formed in the shape of a right-angled triangle and / or a K-shape. The at least one first depression and the at least one second depression can have different shapes. For example, the at least one first depression can have a V-shape and the at least one second depression can have a U-shape. According to a preferred embodiment, the at least one first depression and the at least one second depression have the same shape. It can be advantageous if the at least one first depression and / or the at least one second depression each have a bottom area in which the indentation depth of the respective depression is at its maximum.Preferably, two flank sections adjoin each bottom section on both sides, connecting the bottom section and unmachined areas of the wall component. In particular, the ratio of the wall component thickness in an area surrounding the at least one bursting rib, especially from the outside, to the thickness of the at least one bursting rib is at least approximately 2:1 and / or at most approximately 30:1. By adjusting the thickness of the at least one bursting rib, reliable opening of the bursting device can be ensured. The thickness of the wall component preferably refers to an average material thickness and / or an initial material thickness, especially before the at least one first recess and / or the at least one second recess is created.The thickness of the wall component and / or the thickness of the at least one rupture rib are preferably defined perpendicular to the main plane of extension of the wall component. It may be advantageous if the at least one rupture rib is arranged and / or designed such that it partially or completely ruptures and / or tears upon exceeding a critical pressure and / or temperature. Preferably, the at least one rupture rib ruptures and / or tears due to a force exerted by pressure acting transversely to the main plane of extension of the wall component. It may be advantageous if the at least one rupture rib has a closed shape, particularly annular, which surrounds a rupture surface. The rupture surface forms, for example, a rupture membrane. In particular, the rupture surface has a thickness that corresponds at least approximately to the thickness of the area of ​​the wall component surrounding the at least one rupture rib.It can be advantageous if the at least one bursting rib has at least one fracture section and at least one retention section. The minimum material thickness of the at least one bursting rib in the at least one fracture section is, in particular, at least approximately 10%, and in particular at least approximately 30%, less than the minimum material thickness of the at least one bursting rib in the at least one retention section. In an assembled state of the bursting device, when a critical pressure and / or a critical temperature is exceeded in the interior of a container that includes the wall component, the at least one fracture section preferably forms a predetermined breaking point, which then breaks and / or tears. This allows the bursting surface to be pushed outwards and / or unfolded outwards. The bursting device thus enters an open state.In the assembled state of the bursting device, the at least one retaining section preferably forms a hinge element and / or a deflection line around which the bursting surface is bent and / or pivoted when a critical pressure and / or temperature is exceeded in an interior of the container that includes the wall component. In particular, the at least one retaining section forms a pivot point around which, when the bursting device opens, the bursting surface moves relative to the area of ​​the wall component surrounding the at least one bursting rib. This allows the bursting device to open on one side only. The at least one retaining section prevents parts of the wall component from completely detaching from its base body when the bursting device bursts. In particular, the at least one retaining section enables controlled opening of the bursting device.By means of a movement, particularly a controlled movement, such as a controlled pivoting, of the rupture surface around the at least one holding section, the rupture surface can form a flow guide element for fluid flowing out of the interior. In particular, a directed fluid flow can be created from the interior of the container. Alternatively, instead of the at least one holding section being formed by a part of the at least one rupture rib, it can be provided that the holding section is formed by a region of the wall component adjacent to the at least one rupture rib. The at least one rupture rib then forms, in particular as a whole, the at least one fracture section. For example, the at least one rupture rib is at least approximately U-shaped in a cross-section taken parallel to the main extension plane of the wall component.It can be advantageous if the ratio of the thickness of the wall component to the width of the at least one bursting rib is at least approximately 5:1, and in particular at least approximately 10:1. The width of the at least one bursting rib is preferably identical to the width of the bottom area of ​​the at least one first depression and / or to the width of the bottom area of ​​the at least one second depression, particularly in a direction running at least approximately parallel to the main extension plane of the wall component. It can be advantageous if the ratio of the volume formed by the at least one first depression and / or the at least one second depression to the volume of a machined area of ​​the wall component in which the at least one first depression and / or the at least one second depression are arranged is at least approximately 1:2 and / or at most approximately 4:1.In particular, the ratio of the volume formed by the at least one first depression and the at least one second depression to the volume of a machined area of ​​the wall component in which the at least one first depression and the at least one second depression are arranged is at least approximately 1:2 and / or at most approximately 4:1. The volume formed by the at least one first depression and / or the at least one second depression is preferably a volume that has been removed and / or displaced by machining the machined area. Preferably, the volume formed by the at least one first depression is a volume that is bounded by the flank areas and the bottom area of ​​the wall component. Additionally, the volume formed by the at least one first depression is particularly bounded by an extension of a surface of the first side of the wall component in an unmachined area.The volume formed by the at least one second recess is preferably a volume bounded by the flank regions and the bottom region of the wall component. Additionally, the volume formed by the at least one second recess is particularly bounded by an extension of a surface on the second side of the wall component in an unworked area. It can be advantageous if the bursting device comprises several bursting rib sections, wherein one bursting rib section forms a, in particular closed, bursting rib edge, and wherein one or more further bursting rib sections form separating rupture ribs that divide a bursting surface surrounded by the bursting rib edge into several bursting surface sections. Preferably, the at least one bursting rib lies at least approximately in a median plane of the wall component. The median plane of the wall component is preferably at least approximately parallel to the main extension plane of the wall component.In particular, the wall component has the same indentation depth in the area of ​​the at least one first indentation and in the area of ​​the at least one second indentation. Alternatively, it may be provided that the indentation depth in the area of ​​the at least one first indentation is at least approximately 45%, in particular at least approximately 40%, smaller than the indentation depth in the area of ​​the at least one second indentation.

[0025] It can be advantageous if the at least one burst bridge has at least one fracture section which breaks and / or tears when a critical pressure and / or a critical temperature is exceeded in the interior of the electrochemical cell.

[0026] Preferably, the at least one burst bridge has at least one holding section which, when a critical pressure and / or a critical temperature is exceeded in the interior of the electrochemical cell, maintains a connection between a burst surface surrounded by the at least one burst bridge and a region of the wall surrounding the at least one burst bridge, and about which the burst surface is moved, in particular pivoted.

[0027] In embodiments where the rupture surface comprises several rupture surface parts, which are separated from each other, for example, by separating rupture bridges, the at least one rupture bridge preferably comprises several holding sections. In particular, each rupture surface part is moved around a holding section, especially pivoted.

[0028] The at least one holding section forms, for example, a deflection line around which the bursting surface is deflected and / or deflected.

[0029] For example, the at least one holding section forms at least one hinge element around which the bursting surface or parts thereof is / are deflected.

[0030] Preferably, the bursting surface forms a guide plate for a heat flow which, when the bursting device is open, flows out of the interior of the electrochemical cell.

[0031] Preferably, the at least one holding section and the at least one fracture section form adjacent areas of the at least one burst bridge whose thicknesses differ from each other, with a transition between the areas of different thicknesses being, for example, step-like.

[0032] As an alternative to a stepped transition, it can be provided that the at least one burst bridge has a thickness gradient and / or thickness profile.

[0033] Preferably, a bursting surface surrounded by the at least one fracture section forms a flow guiding element for fluid flowing out of the interior of the electrochemical cell in an open state of the bursting device.

[0034] Preferably, the bursting surface encloses an opening angle of at least approximately 10° and / or at most approximately 80° with a main extension plane of the wall in the open state of the bursting device or during an opening process.

[0035] In particular, when the bursting device is open, a directed outflow and / or a guided degassing takes place.

[0036] The bursting surface forms, for example, a heat-conducting plate.

[0037] The bursting surface preferably has a gas-controlling function when the bursting device is opened.

[0038] It can be advantageous if the at least one bursting bridge has a closed shape, in particular annular, and is approximately oval or at least approximately rectangular in cross-section taken parallel to a main extension plane of the wall component.

[0039] Preferably, the ratio of the length of the fracture section of the at least one burst bridge to the length of the holding section of the at least one burst bridge is at least 2:1 and / or at most 20:1.

[0040] It can be advantageous if the fracture section of the at least one bursting bridge forms at least approximately a U-shape in a cross-section taken parallel to the main extension plane of the wall, and if the holding section of the at least one bursting bridge connects the legs of the U-shape to form a closed shape.

[0041] It may further be provided that a double-sided embossing serves to produce the bursting bridge, whereby the embossing depths on the two sides may differ. In particular, it may be provided that an embossing depth for producing the bursting bridge on one side is at least approximately twice, preferably at least approximately five times, for example at least approximately ten times, the embossing depth on the other side (opposite side), at least partially or completely circumferentially.

[0042] Furthermore, in addition to embossing, and in particular in addition to embossing for the production of the bursting bridge, deformation or shaping to produce a ring prong may be provided. This can, in particular, enable optimized positioning and / or guidance during the production of the bursting element.

[0043] It can be advantageous if the first depression includes a flank area forming an inner flank and a flank area forming an outer flank.

[0044] The inner flank is positioned facing the bursting surface. The outer flank is positioned on the side of the bursting bridge facing away from the bursting surface.

[0045] It can be advantageous if the inner flank and the outer flank enclose varying angles with a main surface and / or middle plane of the bursting element at different points along the bursting bridge.

[0046] For example, it can be provided that in a fracture section of the bursting bridge, in particular in a counter-straight section opposite a holding section, which forms a fracture section that is particularly straight, an angle α a (alpha a) between the outer flank and the main surface and / or median plane of the bursting element is at least approximately 60°, preferably at least approximately 80°, in particular at least approximately 85°, and / or at most approximately 90°, preferably at most approximately 89°. For example, the angle is approximately 88°.

[0047] Furthermore, it can be provided that in the fracture section of the bursting bridge, in particular in the opposite straight section to the holding section, which forms a fracture section that is preferably straight, an angle α i (alpha i) between the inner flank and the main surface and / or median plane of the bursting element is at least approximately 35°, preferably at least approximately 40°, particularly at least approximately 50°, and / or at most approximately 75°, preferably at most approximately 65°. For example, the angle is approximately 60°.

[0048] For example, it may be provided that in a holding section of the bursting bridge, an angle β a (beta a) between the outer flank and the main surface and / or central plane of the bursting element is at least approximately 60°, preferably at least approximately 80°, in particular at least approximately 85°, and / or at most approximately 90°, preferably at most approximately 89°. For example, the angle is approximately 88°.

[0049] Furthermore, it can be provided that in the holding section of the bursting bridge, an angle β i (beta i) between the inner flank and the main surface and / or central plane of the bursting element is at least approximately 35°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 75°, preferably at most approximately 65°. For example, the angle is approximately 60°.

[0050] For example, it can be provided that in one or two curved sections of the bursting bridge, which form a rupture section and in particular each connect a holding section with a counter-straight section, an angle γ a (gamma a) between the outer flank and the main surface and / or median plane of the bursting element is at least approximately 30°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 80°, preferably at most approximately 70°. For example, the angle is approximately 60°.

[0051] Furthermore, it can be provided that in one or two curved sections of the bursting bridge, which form a rupture section and in particular each connect a holding section with a counter-straight section, an angle γ i (gamma i) between the inner flank and the main surface and / or median plane of the bursting element is at least approximately 30°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 80°, preferably at most approximately 70°. For example, the angle is approximately 60°.

[0052] The angle α i (alpha i) is preferably smaller than the angle α a (alpha a). Alternatively or additionally, it may be provided that the angle β i (beta i) is smaller than the angle β a (beta a).

[0053] The angle γ i (gamma i) is preferably at least approximately equal to the angle γ a (gamma a).

[0054] The described angle selection enables, in particular, an optimized and reliable opening of the bursting element, preferably also preventing complete detachment of the bursting surface from the surrounding area. Furthermore, a desired opening angle of the bursting surface can preferably be set, the opening angle indicating the angle by which the bursting surface rotates around the holding section until it reaches an open position.

[0055] It may be provided that the thickness of the burst bridge in one or more or all fracture sections is less than in the holding section.

[0056] Furthermore, the bursting bridge in the holding section is preferably wider, which can be achieved in particular by using a stamping tool for producing the bursting element with flanks shaped as similarly as in the opposite straight section, but flattening and / or shortening them at its end defining the bursting bridge.

[0057] It can be advantageous if the bursting element, in particular the bursting bridge, is designed, and in particular dimensioned, in such a way that the bursting element fails when a differential pressure between an inside and an outside of more than 4 bar, in particular more than 7 bar, preferably at approximately 9 bar, is reached, thereby releasing an opening between the inside and the outside.

[0058] The indentation depth of the first indentation is preferably greater than the indentation depth of the second indentation, wherein the first indentation is preferably arranged on an outer side of the bursting element facing away from a pressure chamber.

[0059] Optionally, in addition to one-sided embossing, a counter-embossing with a shallow embossing depth can be provided.

[0060] In principle, the information mentioned above is suitable for optimizing a first deepening and / or a second deepening.

[0061] The invention further relates to a method for producing an electrochemical cell according to the invention.

[0062] The invention is based on the objective of providing a method by which an electrochemical cell can be manufactured as simply as possible.

[0063] This problem is solved by a method according to the independent claim directed to a method for manufacturing an electrochemical cell.

[0064] According to the method, a wall of a housing of an electrochemical cell, in particular a cover element, is provided.

[0065] At least one bursting bridge will be installed in the wall.

[0066] The at least one bursting bridge has a thickness that varies in the longitudinal direction.

[0067] In addition to the fact that the at least one bursting rib has a thickness that varies in the longitudinal direction, at least one first depression is made on a first side of the wall and at least one second depression is made on a second side of the wall facing away from the first side of the wall, thereby forming the at least one bursting rib.

[0068] Preferably, the at least one first depression and the at least one second depression are simultaneously introduced into the wall of the electrochemical cell.

[0069] In particular, the wall is then connected to one or more other housing components, so that an interior of the electrochemical cell is surrounded by the housing of the electrochemical cell.

[0070] One or more of the features and / or advantages described in connection with the electrochemical cell according to the invention preferably apply equally to the method according to the invention.

[0071] At least one burst bridge is imprinted into the wall of the electrochemical cell.

[0072] The present invention further relates to an electrochemical system.

[0073] The invention is based on the objective of providing an electrochemical system that is as easy to manufacture as possible.

[0074] This problem is solved according to the invention by an electrochemical system according to the independent claim directed to an electrochemical system.

[0075] The electrochemical system comprises one or more electrochemical cells according to the invention.

[0076] Additionally or alternatively, the electrochemical system comprises a housing which surrounds an interior space of the electrochemical system, and a bursting device which is arranged on a wall of the housing and is in particular formed integrally with the wall.

[0077] The bursting device comprises at least one bursting bridge.

[0078] The at least one bursting bridge has a thickness that varies in the longitudinal direction and is formed by at least one first depression, which is arranged on an inner side of the wall of the electrochemical system facing the interior, and at least one second depression, which is arranged on an outer side of the wall of the electrochemical system facing away from the interior, wherein the at least one bursting bridge is formed by embossing.

[0079] The electrochemical system according to the invention preferably has one or more of the features described in connection with the electrochemical cell according to the invention and / or one or more of the advantages described in connection with the electrochemical cell according to the invention.

[0080] Furthermore, the present invention relates to a method for producing an electrochemical system according to the invention.

[0081] The invention is based on the objective of providing a method by which an electrochemical system can be produced as simply as possible.

[0082] This problem is solved by a method for producing an electrochemical system according to the independent claim directed to a method for producing an electrochemical system.

[0083] A wall of a housing for an electrochemical system is provided. At least one rupture rib is incorporated into the wall. The at least one rupture rib has a thickness that varies in the longitudinal direction.

[0084] In addition, at least one first depression is made on a first side of the wall and at least one second depression is made on a second side of the wall facing away from the first side of the wall, thereby forming at least one bursting bridge.

[0085] Preferably, the at least one first depression and the at least one second depression are introduced into the wall simultaneously.

[0086] In particular, the wall is then connected to one or more other housing components, so that an interior space of the electrochemical system is surrounded by the housing of the electrochemical system.

[0087] At least one burst bridge is imprinted into the wall of the electrochemical system.

[0088] Preferably, the at least one first depression and the at least one second depression are introduced into the wall of the electrochemical system by embossing.

[0089] The inventive method for producing an electrochemical system preferably has one or more features of the inventive electrochemical cell and / or one or more advantages of the inventive electrochemical cell.

[0090] Further preferred features and / or advantages of the invention are the subject of the following description and the graphic representation of exemplary embodiments.

[0091] They show: Fig. 1 a schematic perspective view of an embodiment of an electrochemical system comprising several bursting devices; Fig. 2 a schematic perspective view of several electrochemical cells of the electrochemical system made of Fig. 1 , wherein a bursting device is arranged centrally between cell terminals on and / or in each cover element of the electrochemical cells; Fig. 3 a schematic perspective view of an embodiment of a bursting device in the closed state, wherein a wall component of the bursting device has a bursting rib which is at least approximately oval in a top view; Fig. 4 a schematic top view of the bursting device made of Fig. 3 Fig. 5 shows a schematic sectional view through the bursting device from the Fig. 3 and 4 along a in Fig. 4 Plane labelled V; Fig. 6 an enlarged view of the in Fig. 5 area designated VI; Fig. 7, essentially the Fig. 6 corresponding schematic sectional view of the bursting device from the Fig. 3 bis 6 , wherein a volume is shown in the area where material was displaced and / or removed during the creation of a first depression and a second depression; Fig. 8 essentially the Fig. 6 corresponding schematic sectional view of the bursting device from the Fig. 3 bis 7 , where a volume of an area of ​​the wall component which is processed during the insertion of the bursting bridge is shown. Fig. 9 one of the Fig. 6 similar section through a counter-straight segment of an alternative embodiment of a bursting device; Fig. 10 one of the Fig. 9 corresponding cut through a holding section of the bursting device Fig. 9 ; and Fig. 11 one of the Fig. 9 corresponding section through a curve segment of the bursting device Fig. 9 .

[0092] Identical or functionally equivalent elements are designated with the same reference symbols in all figures.

[0093] In Fig. 1 A housing 102 of an electrochemical system designated as a whole by 100 is shown.

[0094] The electrochemical system 100 is preferably suitable for use in a vehicle. For example, the electrochemical system 100 is a battery module.

[0095] In the present case, the housing 102 is at least approximately cuboid in shape and surrounds an interior space 104 of the electrochemical system 100. Several bursting devices 108 are arranged on a wall 106 of the housing 102, which is designed as a side side.

[0096] In the interior space 104 of the electrochemical system 100, several electrochemical cells 110 are arranged (see below). Fig. 2 ).

[0097] For example, the multiple electrochemical cells are 110 prismatic electrochemical cells.

[0098] Preferably, the multiple electrochemical cells are 110 lithium-ion batteries and / or lithium-ion accumulators.

[0099] Each of the electrochemical cells 110 comprises a first housing component 112 of a housing 114, which is at least approximately cup-shaped. The first housing component 112 is covered and / or closed by a second housing component 116 of the housing 114, in particular in such a way that an interior space 118 of the respective electrochemical cell 110 is enclosed in a fluid-tight manner.

[0100] The second housing component 116 is in this case a cover element 120.

[0101] The cover elements 120 each form a wall 122 of the housing 114 of the respective electrochemical cell 110, on and / or in which a bursting device 108 is arranged.

[0102] Alternatively, instead of having bursting devices 108 arranged both on and / or in a wall 106 of the housing 102 of the electrochemical system 100 and on and / or in walls 122 of the electrochemical cells 110, it may be provided that one or more bursting devices 108 are provided either exclusively on and / or in the wall 106 of the housing 102 of the electrochemical system 100 or exclusively on and / or in a wall 122 of one or more electrochemical cells 110.

[0103] The bursting devices 108 preferably serve to equalize pressure between an interior space 104 of the electrochemical system 100 and an environment 124 of the electrochemical system 100 in the event of exceeding a critical pressure and / or a critical temperature in the interior space 104 of the electrochemical system 100.

[0104] In addition or alternatively, the bursting devices 108 each serve to equalize pressure between an interior 118 of one or more electrochemical cells 110 and an environment of the respective electrochemical cell 110 in the event of exceeding a critical pressure and / or a critical temperature in the interior 118 of the respective electrochemical cell 110.

[0105] In the Fig. 1 and 2 The bursting devices 108 are shown purely schematically.

[0106] In the Fig. 3 bis 8 A preferred embodiment of a bursting device 108, such as that which can be used, for example, in the electrochemical system 100 and / or the electrochemical cells 110, is shown in more detail below. This preferred embodiment will be described in detail below.

[0107] As an alternative to use in an electrochemical system 100 and / or one or more electrochemical cells 110, the bursting device 108 is suitable for use in other systems in which, when a critical pressure and / or a critical temperature is exceeded in an interior of a container, pressure equalization between the interior and the environment of the container is to be achieved.

[0108] The bursting device 108 comprises a wall component 126. The wall component 126 can, for example, completely form a wall 106 of a housing 102 of an electrochemical system 100 or a wall 122, for example a cover element 120, of a housing 114 of an electrochemical cell 110 (see Fig. 1 and 2 ).

[0109] It can be advantageous if the wall component 126 comprises or is formed from a metallic material. For example, the wall component 126 comprises or is formed from aluminum.

[0110] In the present case, the wall component 126 is at least approximately planar and / or flat.

[0111] The wall component 126 has a bursting web 128 which, in a cross-section taken parallel to a main extension plane of the wall component 126, is at least approximately oval, for example stadium-shaped.

[0112] Alternatively, it can be provided that the bursting bridge 128 is at least approximately rectangular in cross-section taken parallel to a main extension plane of the wall component 126 (in Fig. 2 (schematically indicated).

[0113] The bursting bridge 128 can alternatively have a shape different from those mentioned above, wherein the bursting bridge 128, in a cross-section taken perpendicular to the main extension plane of the wall component 126, preferably has an extension which in one spatial direction is, for example, by a factor of 2 greater than in a spatial direction perpendicular to it. The spatial directions preferably run parallel to the main extension plane of the wall component 126.

[0114] For example, other polygonal shapes of the bursting bridge 128 are conceivable (not shown in the drawing).

[0115] The wall component 126 can also have several bursting bridges 128 (not shown in the drawing).

[0116] Preferably, the ratio of the thickness of the wall component 126 in an area 152 surrounding the bursting bridge 128, particularly from the outside, to the thickness of the bursting bridge 128 is at least approximately 2:1 and / or at most approximately 30:1.

[0117] The thickness of the wall component 126 preferably denotes a material thickness, for example an initial material thickness, of the wall component 126, in particular in a state before processing of the wall component 126 and / or in a state before the insertion of the bursting web 128.

[0118] The thickness of the bursting bridge 128 preferably refers to a material thickness of the wall component 126 in the area of ​​the bursting bridge 128 and / or a material thickness of the wall component 126 after machining and / or after the insertion of the bursting bridge 128. The thickness of the bursting bridge 128 is, in particular, a minimum thickness of the wall component 126.

[0119] The bursting bridge 128 has a varying thickness along its longitudinal direction 130, which in this case is a circumferential direction 132.

[0120] In this case, part of the burst bridge 128 forms a predetermined breaking point 134.

[0121] According to alternative embodiments, the burst bridge 128 as a whole forms a predetermined breaking point 134.

[0122] As especially in the Fig. 5 bis 8 As can be seen, the bursting bridge 128 is formed by a first depression 136 and a second depression 138 in the wall component 126.

[0123] The first depression 136 and the second depression 138, for example, are cord-shaped and / or linear in shape.

[0124] The first recess 136 and the second recess 138 are preferably arranged on opposite sides of the wall component 126. Preferably, the first recess 136 and the second recess 138 have the same shape and / or the same indentation depth.

[0125] The first recess 136 is preferably arranged on a first side 140 of the wall component 126. The second recess 138 is preferably arranged on a second side 142 of the wall component 126 opposite the first side 140 of the wall component 126 and / or facing away from the first side 140 of the wall component 126.

[0126] In embodiments in which the bursting device 108 forms a component of a housing 102 of an electrochemical system 100, the first side 140 of the wall component 126 forms, for example, an inner side of the wall 106 of the electrochemical system 100 facing the interior 104. The second side 142 forms, for example, an outer side of the wall 106 facing away from the interior 104.

[0127] In embodiments in which the bursting device 108 forms a component of an electrochemical cell 110, the first side 140, for example, forms an inner side of the wall 122 facing the interior 118. The second side 142 preferably forms an outer side of the wall 122 facing away from the interior 118.

[0128] It can be advantageous if the ratio of the thickness of the wall component 126 to the width of the bursting bridge 128 is at least approximately 5:1, in particular at least approximately 10:1.

[0129] The width of the bursting bridge 128 is preferably identical to the width of a bottom area 156 of the first depression 136 and / or to the width of a bottom area 156 of the second depression 138.

[0130] The floor areas 156 are preferably those areas in which the depressions 136, 138 each have a maximum indentation depth.

[0131] In this case, the bursting bridge 128 has a closed shape, in particular a ring-shaped one. The bursting bridge 128 surrounds a bursting surface 144, which, for example, forms a bursting membrane.

[0132] As in Fig. 3 As indicated by a dashed line, it may be intended that the bursting bridge 128 is designed in multiple parts.

[0133] For example, the burst bridge 128 has a burst bridge edge 146, for example a closed one, and one or more dividing burst bridges 148, which divide the burst bridge edge 146 into several segments. The rupture surface 144 is thus divided into several rupture surface parts 150 by the dividing burst bridges 148.

[0134] For controlled breaking and / or rupture of the bursting rib 128 upon exceeding a critical pressure and / or a critical temperature in an interior of a container, which is partially formed by the wall component 126, it may be advantageous if a thickness of the bursting surface 144 and a thickness of the wall component 126 in a region 152 surrounding the bursting rib 128 (from the outside) is at least approximately identical.

[0135] The first recess 136 and the second recess 138 are preferably formed in the wall component 126 by embossing. For example, the wall component 126 is embossed, particularly on both sides, to manufacture the bursting device 108.

[0136] By embossing the wall component 126, complex assembly processes for mounting a separate bursting membrane are particularly unnecessary.

[0137] In the present case, the first recess 136 and the second recess 138 are formed at least approximately in the form of an isosceles trapezoid in a cross-section taken perpendicular to the main extension plane of the wall component 106.

[0138] For example, a tool used to create the first recess 136 and the second recess 138, such as an embossing tool, has elements whose shape is complementary to the shape of the first recess 136 and the second recess 138. These elements are preferably pressed into the wall component 126 simultaneously.

[0139] As an alternative to the first recess 136 and the second recess 138 being in the form of an isosceles trapezoid, it may be provided that the first recess 136 and / or the second recess 138 are formed in a cross-section perpendicular to the main extension plane of the wall component 126 in the form of an isosceles triangle, a right-angled triangle or circular arc (not shown graphically).

[0140] The first depression 136 and the second depression 138 may also have different shapes (not shown in the drawing).

[0141] Preferably, the first recess 136 and the second recess 138 are each formed by two flank regions 154 of the wall component 126, wherein the two flank regions 154 each accommodate a bottom region 156 between them and / or connect laterally to the respective bottom region 156.

[0142] Preferably, the main extension planes of the two flank regions 154 of the first recess 136 enclose an angle of at least approximately 30° and / or at most approximately 80° with each other.

[0143] The main extension planes of the two flank regions 154 of the second recess 138 preferably enclose an angle of at least approximately 30° and / or at most approximately 80° with each other.

[0144] The bursting bridge 128 is formed in this case by the bottom area 156 of the first depression 136 and the bottom area 156 of the second depression 138.

[0145] In the present case, the bursting bridge 128 lies at least approximately in a middle plane of the wall component 126, in particular such that the bursting bridge 128 is arranged centrally between the first side 140 and the second side 142 of the wall component 126.

[0146] The impression depth in the area of ​​the first indentation 136 and the impression depth in the area of ​​the second indentation 138 are identical in this case.

[0147] According to an alternative embodiment (not shown in the drawing), it can be provided that the impression depth in the area of ​​the first recess 136 is at least approximately 45%, in particular at least approximately 40%, smaller than the impression depth in the area of ​​the second recess 138, or vice versa.

[0148] The bursting bridge 128 comprises a holding section 158 and a fracture section 160.

[0149] The minimum material thickness of the bursting bridge 128 in the fracture section 160 is in this case at least approximately 10%, and in particular at least approximately 30%, less than the minimum material thickness of the bursting bridge 128 in the holding section 158.

[0150] In the present case, the fracture section 160 forms at least an approximate U-shape in a cross-section taken parallel to the main extension plane of the wall component 126.

[0151] The retaining section 158 is preferably formed in a cross-section taken parallel to the main extension plane of the wall component 126, at least approximately curved, and / or connects free ends of the legs of the U-shape of the fracture section 160.

[0152] According to an embodiment not shown in the drawing, as an alternative to the bursting rib 128 having a closed shape, the retaining section 158 can be formed by a region of the wall component 126 adjacent to the bursting rib 128. The bursting rib 128 then forms, in particular as a whole, the fracture section 160 and / or a predetermined breaking point 134.

[0153] By selecting a thickness of the retaining section 158 and / or the fracture section 160, a bursting pressure can preferably be set, the exceedance of which causes a part of the bursting bridge 128 or the bursting bridge 128 as a whole to break and / or tear.

[0154] The transition from the holding section 158 to the fracture section 160 can be step-like or via a thickness gradient.

[0155] If a critical pressure (burst pressure) and / or a critical temperature is exceeded in an interior of a container which includes the wall component 126, the fracture section 160 of the burst bridge 128 preferably breaks and / or tears.

[0156] The bursting surface 144 is preferably pushed away from the interior and / or folded outwards during and / or after the breaking and / or tearing of the fracture section 160.

[0157] Thus, the bursting device 108 changes from a closed state to an open state and / or fluid can flow from the interior of the container into the environment (not shown in the drawing).

[0158] The retaining section 158 preferably forms a hinge element and / or a deflection line about which the bursting surface 144 is moved and / or pivoted during a movement of the bursting surface 144 relative to an area 152 of the wall component 126 surrounding the bursting bridge 128.

[0159] For example, when the bursting device 108 is opened, the bursting surface 144 is deflected and / or folded around the holding section 158.

[0160] The bursting surface 144 preferably forms a flow guiding element 162 during an opening process and / or in an open state of the bursting device 108.

[0161] The flow guide element 162 preferably serves to direct fluids flowing out of the container and / or as a heat shield for thermal dissipation and / or shielding.

[0162] It may be advantageous if the flow guide element 162, in an open state of the bursting device 108, forms an angle of at least approximately 10° and / or at most approximately 80° with a main extension plane of the area 152 of the wall component 126 surrounding the bursting bridge 128 (not shown in the drawing).

[0163] The retaining section 158 remains unchanged during an opening process of the bursting device 108 and / or in an open state of the bursting device 108 compared to the closed state of the bursting device 108. In particular, the connection between the bursting surface 144 and the area 152 of the wall component 126 surrounding the bursting web 128 in the area of ​​the retaining section 158 also remains in place in an open state of the bursting device 108.

[0164] In particular, for setting an opening speed, it may be advantageous if the ratio of the length of the breaking section 160 to the length of the holding section 158 is at least approximately 2:1 and / or at most approximately 20:1.

[0165] In embodiments in which the rupture surface 144 is subdivided into several rupture surface parts 150, one or more separating rupture ribs 148 preferably form one or more components of the fracture section 160. For example, the rupture rib 128 has several retaining sections 158, each of which is curved and connects straight sections of the rupture rib 128 to one another. The straight sections of the rupture rib 128 each form, in particular, a fracture section 160.

[0166] For example, the bursting bridge 128 includes a separating bursting bridge 148 arranged centrally as a fracture section 160 (see Fig. 3 ), which ruptures and / or tears when a critical pressure and / or temperature is exceeded in the interior of the container comprising the bursting device 108. In particular, the bursting surface sections 150 fold outwards. The retaining sections 158 each form, for example, a hinge element and / or a deflection line around which the fracture sections 160 are moved and / or pivoted.

[0167] For example, the bursting surface parts 150 are folded away from each other and / or outwards during an opening process of the bursting device 108.

[0168] It can be advantageous if the ratio of a volume formed by the first recess 136 and the second recess 138 to a volume of a machined area of ​​the wall component 126, in which the first recess 136 and the second recess 138 are arranged, is at least approximately 1:2 and / or at most approximately 4:1.

[0169] The volume formed by the first recess 136 and the second recess 138 is preferably a sum of volumes bounded by two flank regions 154 and the bottom region 156 arranged between them, each of which is bounded by an extension of the first side 140 or the second side 142.

[0170] The volume formed by the first depression 136 and the second depression 138 is in Fig. 7 shown hatched and labelled V1 in the area of ​​the first depression 136 and V2 in the area of ​​the second depression 138.

[0171] The volume V1 formed by the first depression 136 is preferably a volume of material that was removed and / or displaced from the wall component 126 to create the first depression 136. The volume V2 formed by the second depression 138 is preferably a volume of material that was removed and / or displaced from the wall component 126 to create the second depression 138.

[0172] The processed area in the wall component 126 is in Fig. 8 This is indicated by a dashed line. This is preferably an area of ​​the wall component 126 on which force was exerted during the creation of the first recess 136 and the second recess 138 and / or which was under the influence of the tool.

[0173] For the production of the electrochemical system 100, a wall 106 is provided into which depressions 136, 138 are introduced on both sides, for example by stamping, in particular in such a way that at least one burst bridge 128 is formed.

[0174] In this process, a tool is adjusted in such a way that the depressions 136, 138 each have a varying thickness along their longitudinal directions 130, for example at least two sections of different impression depth.

[0175] The wall 106 is then preferably connected to another housing component, in particular in a fluid-tight manner, for example by welding.

[0176] An electrochemical cell 110 is preferably manufactured by forming, for example by embossing, recesses 136, 138 on both sides of a wall 122. The embossing particularly forms at least one rupture ridge 128. In an assembled state of the electrochemical cell 110, the wall 122 preferably forms a cover element 120.

[0177] The indentation depth is preferably varied along a longitudinal direction 130 of the first depression 136 and along a longitudinal direction 130 of the second depression 138. In particular, at least two sections are formed in which the first depression 136 and / or the second depression have different indentation depths.

[0178] After embossing, the wall 122 is preferably connected to a housing component 112, for example a cup-shaped one, for example by welding. In particular, a housing 114 of the electrochemical cell 110 is thus formed, which is fluid-tight when the bursting device 108 is closed.

[0179] The bursting device 108 preferably provides a bursting device which exhibits controlled fracture behavior.

[0180] One in the Fig. 9 bis 11 The illustrated alternative embodiment of a bursting device 108 differs from the other illustrated embodiments in particular in that only a one-sided (main) embossing is provided for the production of the bursting bridge 128.

[0181] Alternatively, it can also be provided that a double-sided embossing serves to produce the bursting bridge 128, wherein the embossing depths T are different on the two sides. In particular, it can be provided that an embossing depth T for producing the bursting bridge 128 is at least partially or completely circumferential on one side at least approximately twice, preferably at least approximately five times, for example at least approximately ten times, an embossing depth T on the other side.

[0182] Furthermore, as an alternative or supplement to single-sided or double-sided embossing, in particular in addition to single-sided or double-sided embossing for the production of the bursting bridge, a deformation or shaping process for the production of a ring prong 164 may be provided. This may, in particular, enable optimized positioning and / or guidance during the production of the bursting element 128.

[0183] It can be advantageous if the first depression 136, in particular the only depression 136, comprises a flank area 154 forming an inner flank 166 and a flank area 154 forming an outer flank 168.

[0184] The inner flank 166 is arranged facing the bursting surface 144. The outer flank is arranged on the side of the bursting bridge 128 facing away from the bursting surface 144.

[0185] It can be advantageous if the inner flank 166 and / or the outer flank 168 enclose varying angles with a main surface and / or median plane of the bursting element 108 at different points along the bursting bridge 128.

[0186] For example, it may be provided that in a fracture section 160 of the bursting bridge 128, in particular in a counter-straight section 170 opposite a holding section 158, which forms a particularly straight fracture section 160, an angle α a (alpha a) between the outer flank 168 and the main surface and / or median plane of the bursting element 108 is at least approximately 60°, preferably at least approximately 80°, in particular at least approximately 85°, and / or at most approximately 90°, preferably at most approximately 89°. For example, the angle is approximately 88°.

[0187] Furthermore, it can be provided that in the fracture section 160 of the bursting bridge 128, in particular in the opposite straight section 170 to the holding section 158, which forms a particularly straight fracture section 160, an angle α i (alpha i) between the inner flank 166 and the main surface and / or median plane of the bursting element 108 is at least approximately 35°, preferably at least approximately 40°, particularly at least approximately 50°, and / or at most approximately 75°, preferably at most approximately 65°. For example, the angle is approximately 60°.

[0188] For example, it can be provided that in a holding section 158 of the bursting bridge 128, an angle β a (beta a) between the outer flank 168 and the main surface and / or median plane of the bursting element 108 is at least approximately 60°, preferably at least approximately 80°, in particular at least approximately 85°, and / or at most approximately 90°, preferably at most approximately 89°. For example, the angle is approximately 88°.

[0189] Furthermore, it can be provided that in the holding section 158 of the bursting bridge 128 an angle β i (beta i) between the inner flank 166 and the main surface and / or central plane of the bursting element 108 is at least approximately 35°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 75°, preferably at most approximately 65°. For example, the angle is approximately 60°.

[0190] For example, it can be provided that in one or two curved sections 172 of the bursting bridge 128, which form a fracture section 160 and in particular each connect a holding section 158 with a counter-straight section 170, an angle γ a (gamma a) between the outer flank 168 and the main surface and / or median plane of the bursting element 108 is at least approximately 30°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 80°, preferably at most approximately 70°. For example, the angle is approximately 60°.

[0191] Furthermore, it can be provided that in one or two curved sections 172 of the bursting bridge 128, which form a fracture section 160 and in particular each connect a holding section 158 with a counter-straight section 170, an angle γ i (gamma i) between the inner flank 166 and the main surface and / or median plane of the bursting element 108 is at least approximately 30°, preferably at least approximately 40°, in particular at least approximately 50°, and / or at most approximately 80°, preferably at most approximately 70°. For example, the angle is approximately 60°.

[0192] The angle α i (alpha i) is preferably smaller than the angle α a (alpha a). Alternatively or additionally, it may be provided that the angle β i (beta i) is smaller than the angle β a (beta a).

[0193] The angle γ i (gamma i) is preferably at least approximately equal to the angle γ a (gamma a).

[0194] The described angle selection enables, in particular, an optimized and reliable opening of the bursting element 108, preferably also preventing complete detachment of the bursting surface 144 from the surrounding area 152. Furthermore, a desired opening angle of the bursting surface 144 can preferably be set, the opening angle indicating the angle by which the bursting surface 144 rotates around the holding section 158 until it reaches an open position.

[0195] How the Fig. 9 bis 11 Furthermore, it can be seen that the thickness D BS of the burst bridge 128 in the fracture sections 160 is less than in the holding section 158.

[0196] Furthermore, the bursting bridge 128 in the holding section 158 is preferably wider, which is particularly achievable by having a stamping tool for producing the bursting element 108 with flanks shaped as similarly as in the opposite straight section 170, but flattened and / or shortened at its end defining the bursting bridge 128.

[0197] According to the invention, the following can be added to the Fig. 9 bis 11 The depicted one-sided embossing is to be accompanied by a counter-embossing with a shallow impression depth T.

[0198] In principle, the above information is suitable for optimizing each of depths 136 and / or 138.

Claims

1. Electrochemical cell (110), comprising: - a housing (114) which surrounds an interior (118) of the electrochemical cell (110); and - a rupture device (108) which is arranged on a wall (122) of the housing (114) and in particular is formed in one piece with the wall (122), wherein the rupture device (108) comprises at least one rupture web (128), wherein the at least one rupture web (128) has a thickness which varies in the longitudinal direction (130), and wherein the at least one rupture web (128) is formed by at least one first depression (136) which is arranged on an inner side of the wall (122), the inner side facing the interior (118), and at least one second depression (138) which is arranged on an outer side of the wall (122), the outer side facing away from the interior (118), wherein the at least one rupture web (128) is formed by embossing, in particular by embossing a non-pre-machined region of the wall (122).

2. Electrochemical cell (110) according to Claim 1, characterized in that the at least one rupture web (128), which has a thickness which varies in the longitudinal direction (130), is formed by a depression (136) which is arranged on the inner side of the wall (122), the inner side facing the interior (118), in particular is embossed into it.

3. Electrochemical cell (110) according to Claim 1 or 2, characterized in that the at least one rupture web (128) has at least one breaking portion (160) which breaks and / or tears when a critical pressure and / or a critical temperature in the interior (118) of the electrochemical cell (110) is exceeded, and in that the at least one rupture web (128) has at least one retaining portion (158) which, when a critical pressure and / or a critical temperature in the interior (118) of the electrochemical cell (110) is exceeded, maintains a connection between a rupture surface (144), which is surrounded by the at least one rupture web (128), and a region (152) of the wall (122), the region surrounding the at least one rupture web, and around which the rupture surface (144) can be moved, in particular pivoted, wherein a minimum material thickness of the at least one rupture web (128) in the at least one breaking portion (160) is at least about 10% less than a minimum material thickness of the at least one rupture web (128) in the at least one retaining portion (158).

4. Electrochemical cell (110) according to Claim 3, characterized in that a minimum material thickness of the at least one rupture web (128) in the at least one breaking portion (160) is at least approximately 30% less than a minimum material thickness of the at least one rupture web (128) in the at least one retaining portion (158).

5. Electrochemical cell (110) according to one of Claims 1 to 4, characterized in that a rupture surface (144) surrounded by at least one breaking portion (160) forms, in an open state of the rupture device (108), a flow guiding element (162) for fluid flowing out of the interior (118) of the electrochemical cell (110), wherein the rupture surface (144) preferably includes an opening angle of at least approximately 10° and / or at most approximately 80° with a main plane of extent of the wall (122).

6. Electrochemical cell (110) according to one of Claims 1 to 5, characterized in that the at least one rupture web (128) has an, in particular annularly, closed shape and is at least approximately oval or at least approximately rectangular in a cross section parallel to a main plane of extent of the wall (122), for example.

7. Electrochemical cell (110) according to one of Claims 1 to 6, characterized in that a ratio of a length of at least one rupture portion (160) of the at least one rupture web (128) to a length of at least one retaining portion (158) of the at least one rupture web (128) is at least 2:1 and / or at most 20:1.

8. Electrochemical cell (110) according to one of Claims 1 to 7, characterized in that at least one breaking portion (160) of the at least one rupture web (128) at least approximately forms a U shape in a cross section parallel to a main plane of extent of the wall (122), and in that at least one retaining portion (158) of the at least one rupture web (128) connects limbs of the U shape to form a closed shape, for example to form a closed oval.

9. Electrochemical cell (110) according to one of Claims 1 to 8, characterized in that, in a cross section perpendicular to a main plane of extent of the wall (122), the at least one first depression (136) and / or the at least one second depression (138) are / is at least approximately triangular, in the form of an isosceles trapezium or circular-arc-shaped.

10. Electrochemical cell (110) according to one of Claims 1 to 9, characterized in that, in a cross section perpendicular to a main plane of extent of the wall (122), the at least one first depression (136) and / or the at least one second depression (138) are / is at least approximately in the form of an isosceles trapezium or circular-arc-shaped.

11. Method for producing an electrochemical cell (110) according to one of Claims 1 to 10, wherein the method comprises the following: - providing a wall (122) of a housing (114) of an electrochemical cell (110), in particular a covering element (120); - forming at least one rupture web (128) in the wall (122), wherein the at least one rupture web (128) has a thickness which varies in the longitudinal direction (130); and - forming at least one first depression (136) on a first side (140) of the wall (122) and, in particular simultaneously, forming at least one second depression (138) on a second side (142) of the wall (122), the second side facing away from the first side (140) of the wall (122), whereby the at least one rupture web (128) is formed; - connecting the wall (122) to one or more other housing components (112), so that an interior (118) of the electrochemical cell (110) is surrounded by the housing (114), wherein the at least one rupture web (128) is embossed into the wall (122) of the electrochemical cell (110).

12. Electrochemical system (100), comprising a plurality of electrochemical cells (110), wherein the plurality of electrochemical cells (110) comprise: - a housing (114) which surrounds an interior (118) of the respective electrochemical cell (110); and - a rupture device (108) which is arranged on a wall (122) of the housing (114) and in particular is formed in one piece with the wall (122), wherein the rupture device (108) comprises at least one rupture web (128), wherein the at least one rupture web (128) has a thickness which varies in the longitudinal direction (130) and / or wherein the at least one rupture web (128) is formed by at least one first depression (136) which is arranged on an inner side of the wall (122), the inner side facing the interior (118), and at least one second depression (138) which is arranged on an outer side of the wall (122), the outer side facing away from the interior (118), wherein - the plurality of electrochemical cells (110) are a plurality of electrochemical cells (110) according to one of Claims 1 to 10 and / or - the electrochemical system comprises: - a housing (102) which surrounds an interior (104) of the electrochemical system (100); and - a rupture device (108) which is arranged on a wall (106) of the housing (102) and in particular is formed in one piece with the wall (106), wherein the rupture device (108) comprises at least one rupture web (128), wherein the at least one rupture web (128) has a thickness which varies in the longitudinal direction (130) and wherein the at least one rupture web (128) is formed by at least one first depression (136) which is arranged on an inner side of the wall (106) of the electrochemical system (100), the inner side facing the interior (104), and at least one second depression (138) which is arranged on an outer side of the wall (106) of the electrochemical system (100), the outer side facing away from the interior (104), wherein the at least one rupture web is formed by embossing.

13. Method for producing an electrochemical system (100) according to Claim 12, wherein the method comprises the following: - providing a wall (106) of a housing (102) of an electrochemical system (100); - forming at least one rupture web (128) in the wall (106), wherein the at least one rupture web (128) has a thickness which varies in the longitudinal direction (130); and - forming at least one first depression (136) on a first side (140) of the wall (106) and, in particular simultaneously, forming at least one second depression (138) on a second side (142) of the wall (106), the second side facing away from the first side (140) of the wall (106), whereby the at least one rupture web (128) is formed; - connecting the wall (106) to one or more other housing components, so that an interior (104) of the electrochemical system (100) is surrounded by the housing (102), wherein the at least one rupture web (128) is embossed into the wall (106) of the electrochemical system (100).