Cell separator with holder, battery arrangement and method for producing a cell separator

Abstract

The invention relates to a cell separating element (10) for arrangement on a prismatic battery cell (16), wherein the cell separating element (10) has a first wall (20) and a second wall (22) opposite the first wall, between which a cavity (24) filled or fillable with a fluid (15) is formed, whereby a cushion (12) filled or fillable with the fluid (15) is provided, wherein the cell separating element (10) is divided into a cushion region (12a) and a cell separating element edge region (12b) which surrounds the cushion region (12a) in a circumferential direction and in which the first wall (20) and the second wall (22) are connected to one another, wherein a first part (30a) of a first edge region (20b) of the first wall (20) is designed as a fastening tab (34) for fastening the cell separating element (10) to the battery cell (16) and is arranged at an angle (α) is arranged at an angle to a second part (30b) of the first edge region (20b) adjacent to the cushion region (12a) and lying in a cushion plane of the cushion (12);

Description

[0001] The invention relates to a cell separator for arrangement in a prismatic battery cell. Furthermore, the invention also relates to a battery arrangement with such a cell separator and a method for producing a cell separator.

[0002] High-voltage batteries in electric vehicles often predominantly use lithium-ion cells in various packaging forms, such as round cells, prismatic cells (also called cans), or pouch cells. Cell separators are often positioned between the cells to perform various functions in combination with the cell. These functions include, for example, swelling compensation: electrochemical processes cause the volume of the active material in the foil wrap or foil stack of a battery cell to increase. This increase in volume is referred to as swelling. Defined pressure exerted by the cell separator on the cells is advantageous in order to enable controlled cell swelling. Uncontrolled swelling as well as completely suppressed swelling lead to a reduced service life. Another function relates to thermal propagation in the event of thermal runaway of a battery cell.It is advantageous to install cell separators between the cells, providing thermal insulation, for example, by thermally insulating a continuous cell to such an extent that neighboring cells are prevented from catching fire or thermally breaking through. Another function can also be cell temperature control. Cells can generally be thermally controlled via a thermal connection to a heating and / or cooling circuit to ensure full functionality and meet service life requirements. The thermal connection of the cell can be established via the cell base and / or cell lid or via cell separators.

[0003] With current cell separation element designs, the functions described above require the use of multiple components or cannot be implemented to the desired extent. This sometimes requires significantly increased material usage. This negatively impacts the required installation space, weight, manufacturing and assembly effort, and material costs.

[0004] It would therefore be desirable to be able to integrate as many of the above-mentioned functions as possible into a cell separation element in the most efficient and space-saving way possible.

[0005] The construction of a cell stack has also been relatively complex, as the battery cells and cell separators must be stacked alternately and then clamped together or arranged in a common housing. To hold the cell separators in position, they are often glued to the battery cells. However, this in turn complicates the disassembly of such a cell stack. Furthermore, the placement of such a cell separator in the position where it is to be glued is very difficult.

[0006] DE 10 2010 012 932 A1 describes a battery with a stack of battery cells designed as self-contained flat cells with an insulating sheath and exposed electrical terminals. The stack is stacked alternately from battery cells and at least one intermediate plate, wherein the intermediate plate is connected to at least one of the electrical terminals of at least one of the adjacent battery cells. The intermediate plates can be connected to the electrical terminals by soldering, welding, clamping, or crimping. The intermediate plate serves as a large-surface battery terminal that can be contacted quickly and easily. Furthermore, heat conduction can be provided via the intermediate plate to better equalize temperatures within the battery cells.

[0007] Neither swelling compensation nor a thermal barrier can be achieved using such an intermediate plate.

[0008] JP 2021 - 9 787 A describes a cell separator element that is arranged on a battery cell by means of a fastening tab.

[0009] The object of the present invention is to provide a cell separator, a battery arrangement and a method which allow the provision of a cell separator for thermally shielding two battery cells and for swelling compensation with as few individual parts as possible and the simplest and most efficient production of a cell stack.

[0010] This object is achieved by a cell separator, a battery assembly, and a method having the features according to the respective independent patent claims. Advantageous embodiments of the invention are the subject of the dependent patent claims, the description, and the figures.

[0011] A cell separator element according to the invention for arrangement on a prismatic battery cell comprises a first wall and a second wall opposite the first wall, between which a cavity filled or fillable with a fluid is formed, thereby providing a cushion filled or fillable with the fluid. The cell separator element is divided into a cushion region and a cell separator edge region that surrounds the cushion region in a circumferential direction, delimits the cushion in and against a first direction and in and against a second direction, and comprises a first edge region of the first wall and a second edge region of the second wall. Furthermore, the first wall and the second wall are connected to one another in the cell separator edge region.Furthermore, a first part of at least the first edge region is designed as a fastening tab and is arranged at an angle to a second part of the first edge region adjacent to the cushion region, wherein the cell separating element is held or can be fastened to the battery cell by means of the fastening tab.

[0012] By designing the cell separation element with a cushion, a large number of advantageous functions can be integrated into the cell separation element, as will be explained in more detail below. In particular, the cell separation element can be designed with very good thermally insulating properties, as well as very good swelling compensation properties, and with an optional cooling function. However, it is particularly advantageous that very few components are required to provide such a cell separation element, and moreover, an additional holding or fastening function can be integrated into the cell separation element without additional components, for example simply by slightly extending at least one edge region of a wall of the cell separation element and correspondingly forming, for example bending, this part, which is referred to here as the first part of the first edge region and provides a corresponding fastening tab.The cell separation element can therefore be formed from two walls that are joined together in the cell separation element edge region, and whose edge regions, or at least one of the edge regions of the walls, can be used to provide a holding function for the cell separation element through an angled design. As a result, the cell separation element can advantageously be held force-fitting and / or form-fittingly on a prismatic battery cell, e.g., by clipping it on. This holder provided by the fastening tab can, on the one hand, serve as a positioning aid, for example, to arrange the cell separation element precisely on the prismatic battery cell. The angled design of the first edge region can thus serve as a stop angle to enable such positioning. Furthermore, this holder also enables simplified assembly of a cell stack.For example, the cell separator no longer needs to be glued to a battery cell to enable easy assembly or stacking while holding the cell separator in position. Instead, this function can now also be performed by the fastening tab. Furthermore, additional functions can be easily integrated into the fastening tab, such as a spacer function and / or a mechanical coupling function for connecting multiple cell separators to one another, as will be explained in more detail later. This significantly increases the overall mechanical stability of a cell stack.

[0013] The walls of the cell separation element, in particular at least one of the walls or both walls, can be bowl-shaped. The first wall and / or second wall can each be formed with an opposing elevation or convex curvature in the cushion region. This creates the cavity between the two walls in the central cushion region. The two walls can be realized, for example, by two deep-drawn plates or films. These can be deep-drawn opposite one another in their respective central regions, so that a cavity is formed between the two walls in the central region. It is also conceivable for one of the walls to be flat and only the other with a corresponding bowl-shaped geometry.

[0014] The cushion can, for example, be designed such that such a fluid, generally a liquid and / or a gas such as air, is permanently enclosed in the cavity. However, it can also be designed so that such a fluid can flow through it. For this purpose, a coolant supply and discharge connection can be provided on the cushion. In both cases, it is possible to generate a certain pressure in the cavity using the fluid. If the cell separation element is arranged between two cells that swell due to their swelling properties, the cushion can advantageously be compressed at least in part. The cushion is therefore designed to be at least partially compressible. With increasing compression, the counterforce generated by the fluid in the cavity can increase. In particular, the cushion can also be elastically deformable, especially when filled with the fluid. This can, above all, also prevent breathing of the cells, i.e.A state-of-charge-dependent, cyclical swelling and shrinking of the cells, which can also be called charge-induced swelling, can be very well compensated. The cushion can thus adapt very well to the cyclical swelling and shrinking of the cells by correspondingly elastically varying its thickness. If a gas is also present as a fluid in the cavity of the cushion, this can provide particularly good thermal insulation properties of the cell separation element. Furthermore, for example, a thermal runaway of a battery cell adjacent to the cell separation element causes the fluid, in particular the gas, in the cavity to heat up, causing it to expand and thus distance the thermally continuous cell from its neighboring cells. This advantageously allows many advantageous properties to be easily combined in a cell separation element.

[0015] In the following, for the sake of simplicity, reference is made in part to different directions. These are to be defined as follows: The cell separator has a length in the first direction, a width in the second direction, and a thickness in a third direction. The first wall lies opposite the second wall with respect to the third direction. The thickness of the cell separator or cushion is likewise defined in the third direction. When the cell separator is arranged as intended in a cell stack with a plurality of battery cells arranged next to one another in a stacking direction, which battery cells can be designed, for example, as pouch cells and / or prismatic battery cells, the third direction preferably also corresponds to the stacking direction.

[0016] In principle, the cushion can have any desired geometry and can, for example, also be circular. However, the geometry of the cushion is preferably adapted to the geometry of the battery cells between which the cushion is to be arranged. The cushion is preferably arranged between cells that are designed as prismatic battery cells. These battery cells typically have essentially rectangular side surfaces viewed perpendicular to the stacking direction. Accordingly, it is preferred that the cushion also has a rectangular geometry. Accordingly, it is preferred that the first wall as well as the second wall, or at least the wall sections delimiting the cushion, each have a rectangular geometry. Furthermore, it is preferred that the first, second and third directions defined above are perpendicular to one another.In other words, the first direction should preferably be perpendicular to the second and third directions, and the second direction should preferably be perpendicular to the third direction.

[0017] Furthermore, it is very advantageous if a length and width of the cell separation element and the cushion are significantly greater than a thickness of the cell separation element or the cushion in the third direction, in particular by at least a factor of 10. The length and width can generally be several centimeters, while the thickness of the cell separation element or the cushion at the thickest point is, for example, a maximum of 15 mm or less.

[0018] The thickness of the cushion in the third direction can be substantially constant across the cushion, i.e. in the course in the first and / or second direction, in the uninstalled state of the cell separation element, i.e. without additional external force application, apart from a prevailing ambient pressure corresponding to standard conditions, or can, for example, vary in the course in the first and / or second direction.

[0019] The cell separation element edge region can comprise a first edge region of the first wall, which runs around the first central region of the first wall and delimits the first wall on both sides with respect to the first and second directions. Furthermore, the cell separation element edge region can comprise a second edge region of the second wall, which runs around a second central region of the second wall and delimits the second wall on both sides with respect to the first and second directions. In other words, the first and second walls can each be divided into a central region and an edge region which runs around this central region and delimits the respective wall on both sides in both the first and second directions.

[0020] If a fluid is enclosed in the cushion or its cavity, or if a fluid flows through the cushion during operation, the cushion can have a compressed and an uncompressed state. In the uncompressed state, the fluid in the cavity can have a pressure greater than ambient pressure or a pressure corresponding to ambient pressure or normal pressure under predetermined standard conditions. In the compressed state of the cushion, the fluid in the cavity has a pressure greater than ambient pressure.

[0021] Optional connections, for example a coolant supply connection and a coolant discharge connection, can be arranged in the edge region of the cell separation element. This can provide an additional cooling function for the cell separation element. However, it is particularly advantageous if the cushion is designed such that the fluid is enclosed in the cushion's cavity. In this case, the cushion does not need to be provided with connections. The fluid can be enclosed in the cavity during cushion production. This means that the cushion does not need to be provided with interfaces for subsequently filling the cavity with a fluid. It is therefore very advantageous if the cushion's cavity is filled with a fluid, for example a liquid and / or a gas, and the two walls in the cell separation element's edge region are joined in a fluid-tight manner by the closed, circumferential joint.The first edge region of the first wall can thus be joined to the second edge region of the second wall in a fluid-tight manner, all the way around. In this case, the joining connection can be designed along a closed, circumferential joining contour.

[0022] The cushion can, for example, be permanently filled with a gas as the fluid. As a cell separation element, such a gas-filled cushion has the great advantage that it allows precisely adjustable pressure conditions to be provided as a counterforce to the cell, perfect elastic properties can be achieved over the cell's lifetime thanks to the gas filling, and very good insulation properties can be achieved thanks to the gas cushion between the cells. Furthermore, additional expansion of the gas cushion in the cushion can result in even better insulation in the event of thermal runaway of a cell due to the increase in volume of the gas caused by the high temperature increase, and thus the hot cell can be pushed away from the cells to be protected. The gas-filled cushion can therefore also be used to integrate a safety mechanism in the event of thermal runaway of a battery cell.

[0023] A closed, circumferential cell separator edge region is to be understood as an area that runs along a closed edge contour, e.g. around a center of the respective and second wall relative to the first and second direction. In the case of a rectangular cushion or in the case of rectangular side walls, the closed, circumferential cell separator edge region is also rectangular. In the case of a round cushion, for example, the cell separator edge region would also be round. The cell separator edge region can comprise an edge or an edge of the respective wall, e.g. the top and bottom as well as the left and right edges of the first wall or second wall, but does not have to be restricted to this edge, but can extend some distance towards the center of the respective wall.For example, the cell separation element edge region, and accordingly also the first and second edge regions of the respective two walls, can extend from the edge of the respective wall towards the center by a length which is preferably also only a few centimeters or millimeters, for example a maximum of 30 millimeters or a maximum of 20 millimeters or a maximum of 10 millimeters.

[0024] The first and second walls furthermore preferably border directly on the cavity delimited thereby. Furthermore, the cavity is delimited exclusively by regions of the first and second walls. A cushion edge region, which borders the cushion or the cavity all the way around perpendicular to the third direction, is also correspondingly provided by regions of the first and / or second wall, namely by the regions that, viewed perpendicular to the third direction, are located between the cavity and the area surrounding the cushion. The cushion edge region thus borders on the cavity perpendicular to the third direction and surrounds it, and the cell separation element edge region, in turn, adjoins the cushion edge region all the way around and perpendicular to the first direction. The first and second walls can in particular be the only components of the cell separation element. In particular, the cushion therefore has no further elements delimiting the cavity.

[0025] The cavity is preferably a continuous cavity. Alternatively, the cavity can also be subdivided into individual subchambers that are separated from one another or not fluidically connected. For example, when the cell separation element is arranged as intended between the two battery cells, a large portion of the space between the two battery cells is filled with the cushion region of the cell separation element, which encompasses the cavity as the only cavity in the cushion region. The cushion region or cavity is therefore preferably not subdivided or separated into individual smaller cavities.

[0026] The joint allows this cavity to be hermetically sealed. The walls themselves are also airtight or gas-tight and, at least if the cushion is designed as a fluid-filled pressure cushion, in which the fluid is permanently contained and enclosed in the cavity, have no interfaces, valves, or similar devices for supplying or removing gas or another fluid from the cushion, at least not without impairing the function of the cushion or destroying it. The cavity can therefore be filled with the fluid before or during the joining process for joining the two edge regions of the first and second walls, and does not have to be done subsequently.

[0027] The fact that the first part of the first edge region is formed as a fastening tab means that this fastening tab is an integral part of the first wall. The fastening tab is thus formed from a part of the first wall, for example, by forming, such as bending or folding or the like. This enables particularly simple production of the cell separation element and easy integration of such a holding function, since no additional separate component is required to form such a fastening tab.

[0028] The fastening tab can generally be single-walled or double-walled. In other words, the fastening tab can consist only of the first part of the first edge region of the first wall, or the fastening tab can also comprise a corresponding first part of the second edge region of the second wall, which is arranged at an angle to a second part of the second edge region of the second wall, which part is adjacent to the cushion region and lies in a cushion plane of the cushion. The two first parts of the first and second edge regions can, for example, lie flat against one another and together provide the fastening tab. The single-walled design of the fastening tab saves weight and material. The double-walled design of the fastening tab can increase its rigidity and strength.

[0029] The fact that the first part of the first edge region is arranged at an angle to the second part of the first edge region should in particular be understood to mean that there is an angle different from 180° between the first and second parts. The first and second parts, which are to be understood in particular as flat elements, therefore do not lie in a common plane. The second part can furthermore lie in a cushion plane of the cushion or in a plane or parallel to a plane that can be spanned by the first and second directions. The cushion plane can therefore likewise be aligned parallel to a plane that is spanned by the above-mentioned first and second directions. With regard to a correct arrangement of the cell separation element in a cell stack with a plurality of prismatic battery cells arranged next to one another in a stacking direction, the cushion plane can therefore be oriented essentially perpendicular to the stacking direction.

[0030] According to a further advantageous embodiment of the invention, the first part of the first edge region is arranged at an angle such that, when the cushion region of the cell separating element is arranged on a first housing side of the battery cell, the first part of the first edge region can be placed or laid flat on a second housing side of the battery cell adjacent to the first housing side. In other words, if the cell separating element is arranged as intended on the prismatic battery cell, the cushion region of the cell separating element is arranged on the first housing side of the battery cell, which preferably represents one of the two housing sides of the prismatic battery cell with the largest area, and the first part of the first edge region, which therefore provides the fastening tab, lies flat against the second housing side of the battery cell. For example, the first part of the first edge region can form an angle of approximately90 degrees relative to the second part of the first edge region, for example + / - 10 degrees or + / - 5 degrees. As explained in more detail below, the cell separator can also comprise a plurality of such fastening tabs. These can, for example, be arranged opposite one another to provide a type of clamping function. The angle between the first part of the first edge region and the second part of the first edge region can then, for example, be slightly less than 90 degrees. By plugging the cell separator onto the battery cell, a correspondingly slight bending or flexion of the first part relative to the second part can be provided, in particular an elastic bending, which results in a certain contact force of the first part on the second housing side. The same applies to the opposite fastening tab.

[0031] According to a further advantageous embodiment of the invention, the cell separating element comprises a plurality of fastening tabs. These can include the fastening tab already mentioned. Furthermore, the plurality of fastening tabs or in particular the at least one further fastening tab can be designed in the same way as already described for the at least one fastening tab and explained below. In other words, the features described above and below with regard to the fastening tab can also apply analogously to all other optional fastening tabs of the cell separating element. The respective fastening tabs can each be designed as a first part of the first and / or second edge region, in particular wherein the cell separating element comprises, for example, a first and a second fastening tab that are arranged on opposite sides of the cushion with respect to the first direction or the second direction.This allows, for example, the aforementioned clamping function to be easily implemented. The cell separator element can also comprise three or four fastening tabs, for example. These third and fourth fastening tabs can also be located opposite each other. Generally, such a fastening tab can be provided on one, two, three, or four sides of the cushion as part of the cell separator edge area.

[0032] According to a further advantageous embodiment of the invention, the first part of the edge region is as wide as the second part of the edge region. In this case, the first part of the edge region, i.e. the fastening tab, can extend essentially over the entire width of the cushion or the cell separation element, for example in the first direction or in the second direction, depending on the arrangement of the fastening tab. For example, the corresponding edge region can simply be made somewhat longer in a desired direction and bent over to provide the fastening tab. Cutting or similar measures to the edge region is then not necessary. However, it is also conceivable for the first part of the edge region to be less wide than the second part of the edge region. This also makes it possible to provide a correspondingly narrower fastening tab.This means that it doesn't have to extend across the entire width of the cell separator or cushion. This also makes it possible, for example, to provide multiple fastening tabs on the same side of the cushion.

[0033] The wide design of the fastening tab has the advantage that a large part of, for example, an edge of the cell housing and / or the second housing side can be covered and concealed by the fastening tab. This offers additional protection for the battery cell, especially in the event of outgassing from the battery cell or another battery cell. Even if the battery cell itself outgasses, for example via a cell venting opening provided in the second housing side, e.g. a bursting membrane, the probability of damage to or tearing of the second housing side caused by the escaping hot gases can be largely minimized by the covering fastening tab. In such a case, the fastening tab is designed so that at least one such releasable cell venting opening is not covered by the fastening tab.

[0034] According to a further advantageous embodiment of the invention, the at least one fastening tab comprises a first locking element which, when the cushion region of the cell separating element is arranged on a first housing side of the battery cell, can be coupled in a locking manner to a corresponding second locking element of a second housing side of the battery cell adjacent to the first housing side. For example, the fastening tab can be designed with a locking lug as such a first locking element, and the second housing side of the battery cell has a corresponding notch with which the locking lug can be engaged. Instead or additionally, the second housing side can also be designed with such a locking lug, and the first locking element is designed as a corresponding recess or notch in the fastening tab. As a result, the fastening tab can advantageously lock onto the battery cell, in particular onto its second housing side.This means that the fastening tab and in particular the entire cell separator element can be fixed to the battery cell even more reliably.

[0035] Such a locking element can be located at one end of the fastening tab, although this does not necessarily have to be the case. Such a locking element can be designed as a local locking element on the fastening tab. This can, for example, make it impossible for the fastening tab to be moved relative to the battery cell in a plane in which the second housing side also lies. Overall, the cell separator element can thus be fixed relative to the battery cell in three spatial directions, e.g. in combination with another tab on the opposite side, which rests against and / or is clipped into a housing side of the cell housing opposite the second housing side.

[0036] According to a further advantageous embodiment of the invention, the at least one fastening tab is formed with a spacer at one end of the tab, in particular wherein the fastening tab projects beyond the battery cell in the third direction when the cushion region of the cell separator is arranged on the first housing side of the battery cell. The cell separator, in combination with the battery cell, can, for example, form a battery cell unit. By forming the fastening tab with a spacer at the end of the tab, a defined minimum distance to the next battery cell unit in the stacking direction can be ensured.In other words, to form a cell stack, a plurality of battery cell units provided in this way can be arranged next to one another in the stacking direction, in particular arranged against one another, wherein the spacer of a respective cell separating element ensures a certain minimum distance between two battery cell units, and thus also between two battery cells in the stacking direction. Such a spacer, in turn, has great advantages, especially in combination with the design of the cell separating element with a cushion that can be filled or is filled with the fluid or gas, since this can prevent, for example, swelling-related flattening of the cushion. However, such a spacer can also be implemented differently, for example by means of a different type of embossing of the first and / or second wall of the cell separating element, as explained in more detail later.

[0037] In principle, the spacer can already be realized by the fastening tab projecting beyond the battery cell in the third direction when the cushion region of the cell separator is arranged on the first housing side of the battery cell. However, it is particularly advantageous if the tab end is configured with an additional, specific geometry, for example, bent and / or folded and / or curved and / or bent or folded multiple times, or has a groove pattern. This can increase the rigidity and robustness of the spacer.

[0038] According to a further advantageous embodiment of the invention, the spacer is designed as a hook which is folded over at the end and which, when the cushion region is arranged on the first housing side, engages around a third housing side of the battery cell, which adjoins the second housing side and is opposite the first housing side. On the one hand, such a hook-shaped design can additionally stabilize the holding function of the cell separator element, since it enables it to engage around the third housing side of the battery cell. The cell separator element can be easily clipped onto the battery cell, especially if it comprises several such fastening tabs, for example two opposing fastening tabs, with the fastening tabs engaging around the battery cell at the end and snapping into place.The folded hook design also has the significant advantage that such a hook can be easily created without additional components by simply reshaping the fastening tab. The hook can also be folded or bent multiple times, making it even thicker in the third direction. This allows the hook to simultaneously provide the spacer function in a simple manner.

[0039] Furthermore, the tab end, in particular the spacer, can be designed as a spring element. The tab end, in particular the spacer, can thus be elastically flexible in the third direction. This advantageously provides tolerance compensation for different distances to neighboring cells or the cell separation elements arranged on them. Such a spring function can also be realized, for example, by a type of hook geometry of the tab end. This can, for example, be bent several times, e.g., into a V-shaped geometry or a type of zigzag geometry.

[0040] However, such a hook does not necessarily have to function as such a spacer, but can also fulfil another function in addition or alternatively.

[0041] Accordingly, a further advantageous embodiment of the invention is provided if the cell separator element has a third locking element for locking connection to a locking element with a specific locking geometry, and the fastening tab at the end of the tab has a fourth locking element with the specific locking geometry for locking into another similar cell separator element. This fourth locking element can, for example, also be designed like the folded hook described above, in particular folded over several times. Optionally, the fourth locking element can also function as a spacer. In the present case, the fourth locking element takes on the function of being able to lock battery cell units arranged next to one another by locking the respective cell separator elements into one another. For this purpose, each of the cell separators therefore has a third and corresponding fourth locking element.The fourth locking element is advantageously arranged at the end of the fastening tab. The fastening tab is also designed such that, when the cell separator is arranged on the battery cell as intended, it projects beyond the battery cell in the third direction. This allows the end of the tab with the fourth locking element to be easily hooked or locked into the cell separator of the next battery cell unit. The locking element can also be designed to be spring-loaded. The third locking element can also be located in the edge area or, for example, in the shell edge of the cushion. Individual battery cell units can thus be mechanically secured to one another.

[0042] Here, too, the locking elements can be, for example, locking lugs and / or V-shaped bending geometries and corresponding recesses or notches or any other locking geometries that correspond to one another.

[0043] Furthermore, these locking elements, namely the third and fourth locking elements, can be provided in addition to the first locking element described above.

[0044] Furthermore, the cell separator element can have further advantageous features, as described, for example, in the applications of the same applicants, filed with the German Patent and Trademark Office on the same day as the present application, with the titles "Cell separator element with integrated cooling channel, battery module, battery and method for producing a cell separator element", "Cell separator element with integrated structural pattern, and battery module with such a cell separator element" and "Cell separator element with integrated spacer, battery module and method for producing a cell separator element", in particular in each case in claims 1 to 10.

[0045] An outer side of the first and / or second wall can be formed in the central cushion region with a first recess which comprises a first end and a second end, each of which opens into a shell edge of the cushion. The recess can be formed as a first structure embossed on the outside of the first and / or second wall, in particular as a groove, e.g. a straight groove. The second wall can be formed to correspond to the first wall or only the second wall can be formed as described for the first wall. The first and / or wall can have a plurality of such grooves; these can run parallel to one another and / or intersect at an angle, e.g. perpendicular, to form a grooved grid.With regard to the intended installation position in a cell stack, a cooling channel through which a coolant, e.g., air, can flow is formed between the first and / or second outer side and a cell wall of a battery cell of the battery module adjacent to the first and / or outer side by the recess in the first outer side. These one or more recesses or grooves can be part of the structural pattern described below or its structural element.

[0046] Additionally or alternatively, the first and / or second wall may have an embossed, recessed structural pattern with at least one embossed, recessed structural element, wherein the structural pattern, when the cushion is compressed such that the at least one structural element has contact with an inner side of the second or first wall adjacent to the cavity, is elastically deformable and / or plastically deformable such that a cavity volume of the cavity is increased by a plastic deformation of the structural pattern.The at least one structural element can be designed such that it is elastically deformable or more elastically than plastically deformable below a certain limit pressure, and plastically deformable or more plastically than elastically deformable above the limit pressure, and / or wherein the structural pattern as the at least one structural element comprises a first structural element and a second structural element which are designed such that below a certain limit pressure the first structural element is essentially only elastically deformed and above the limit pressure the second structural element is essentially only plastically deformed. A first structural element can be stiffer than a second structural element of the structural pattern and / or be embossed more or less deeply. The structural pattern can be designed with a varying maximum structural depth. The second orThe first wall can have an embossed, recessed second structural pattern with at least one embossed, recessed third structural element, which is directly opposite the at least one structural element of the first or second wall. Structural elements of the first and second walls can therefore be directly opposite each other. The structural pattern, as the at least one structural element, can comprise an elongated, groove-shaped depression, in particular wherein the structural pattern has a plurality of groove-shaped depressions forming a grid structure, which subdivide the first and / or second wall in the cushion region into a plurality of segments, in particular rectangular segments.Additionally or alternatively, as the at least one structural element, the structural pattern may comprise a local indentation having a center defining a deepest point of the indentation, wherein the indentation comprises a region surrounding the center and in which the depth of the indentation decreases with increasing distance from the center. The structural pattern may comprise a plurality of indentations, wherein the outer side of the first and / or second wall may be divided into a plurality of segments by the aforementioned grooved grid, and one of the indentations may be arranged in a respective segment.

[0047] In particular, the cell separating element edge region can have a structure in at least one section of the cell separating element edge region different from the fastening tab, which structure is formed by at least one deformation of the cell separating element edge region and by which a supporting spacer with respect to the third direction is provided. Such a spacer can therefore be provided in addition to or alternatively to the spacer that can be provided by the tab end described above. The structure extends along the circumferential direction, e.g. along the entire cell separating element edge region surrounding the cushion or only over one or more partial regions of the cell separating element edge region, in particular over two partial regions that are opposite one another with respect to the first direction or with respect to the second direction.The structure can also be designed such that it provides pressure relief and / or stabilization of the joint connection in the event of external force being applied to the cushion on both sides with respect to the third direction. In particular, the structure is designed such that when the spacer is subjected to external force from both sides with respect to the third direction, the first and second walls are pressed together in a contact area of ​​the cell separator edge area, wherein the joint connection is located in the contact area, and / or the contact area is located closer to the central cushion area than the joint connection. The joint connection can also be closer to the central cushion area than the contact area.The deformation of the cell separation element edge region can be provided by bending and / or folding and / or flanging at least a portion of the first and / or second edge region, in particular by a mutually opposite, opposite bending and / or folding and / or flanging of the first and second edge region, e.g. in regions in which the fastening tab is not located. The deformation of the cell separation element edge region can also be provided by embossing the first and / or second wall in the cell separation element edge region, in particular by a mirror-symmetrical embossed structure in the first and second edge region. The first and / or second edge region can also be formed with a wave structure and / or bead structure and / or groove structure, in particular as the structure or in addition to the structure.Furthermore, at least the first edge region can be formed with an elongated first elevation which is convex with respect to the third direction and extends completely or partially around the first central region of the first wall in the circumferential direction, wherein in particular an elastic groove is located between the first central region of the first wall and the first elevation, in particular wherein additionally the second edge region is formed with an elongated second elevation which is convex with respect to the third direction, which is directly opposite the first elevation with respect to the third direction, and which extends completely or partially around the second central region of the second wall in the circumferential direction, wherein in particular a further elastic groove is located between the second central region of the second wall and the second elevation.

[0048] Furthermore, the invention also relates to a battery assembly with a cell separator according to the invention or one of its embodiments. Furthermore, the battery assembly can also comprise a battery cell, in particular a prismatic battery cell. The cell separator can be held or secured to the battery cell in a force-fitting and / or form-fitting manner by means of the fastening tab. The cell separator and the battery cell can, for example, form a battery cell unit as defined above.

[0049] In addition, the battery arrangement can also comprise a cell stack with a plurality of battery cell units arranged next to one another in a stacking direction.

[0050] Furthermore, the battery arrangement can be designed as already described in connection with the cell separating element according to the invention or its embodiments.

[0051] Furthermore, the invention also relates to a battery with a battery arrangement according to the invention or one of its embodiments.

[0052] The battery cells can be designed, for example, as lithium-ion cells or as battery cells with any other cell chemistry. Furthermore, the battery cells can be designed, for example, as prismatic battery cells. The battery cells can also be designed using wound or stack technology, i.e. with an electrode arrangement inside the cell that is designed as an electrode wound or as a layered or stacked electrode arrangement. The battery or the battery arrangement can be designed as a high-voltage battery. In this example, the battery can also comprise several battery arrangements, e.g. in the form of battery modules. The battery or the battery module can also be designed as a medium-voltage battery or low-voltage battery.In addition, the battery can be used in a motor vehicle, but also in other areas outside of a vehicle, for example as a stationary battery or in a battery-operated product, for example power tools, and so on.

[0053] Furthermore, the invention also relates to a motor vehicle with a battery according to the invention or one of its embodiments. The battery can be a traction battery of the motor vehicle.

[0054] The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle.

[0055] Furthermore, the invention also relates to a method for producing a cell separator for arrangement on a prismatic battery cell, wherein the cell separator is formed with a first wall and a second wall opposite the first wall, between which a cavity filled or fillable with a fluid is formed, thereby providing a cushion filled or fillable with the fluid. The cell separator is divided into a cushion region and a cell separator edge region that surrounds the cushion region in a circumferential direction, delimits the cushion in and opposite to the first direction and in and opposite to a second direction, and comprises a first edge region of the first wall and a second edge region of the second wall. Furthermore, the first wall and the second wall are connected to one another in the cell separator edge region.In addition, a first part of the first edge region is designed as a fastening tab and is angled at an angle to a second part of the first edge region adjacent to the cushion region, wherein the cell separating element is held or attachable to the battery cell by means of the fastening tab.

[0056] The advantages described for the cell separation element according to the invention and its embodiments apply equally to the method according to the invention.

[0057] The angled formation of the first part relative to the second part can be achieved by forming at least the first edge region, e.g. bending or folding or chamfering.

[0058] The invention also includes further developments of the method according to the invention that have features already described for the further developments of the cell separator element according to the invention and the battery assembly according to the invention. For this reason, the corresponding further developments of the method according to the invention are not described again here.

[0059] The invention also encompasses combinations of the features of the described embodiments. The invention therefore also encompasses implementations that each comprise a combination of the features of several of the described embodiments, unless the embodiments are described as mutually exclusive.

[0060] Exemplary embodiments of the invention are described below. Shown are: Fig. 1 a schematic and perspective representation of a battery cell unit with a cell separator and a battery cell according to an embodiment of the invention; Fig. 2 a schematic cross-sectional view of a battery cell unit with a cell separator according to an embodiment of the invention; Fig. 3 a schematic representation of a fastening tab for a cell separating element according to an embodiment of the invention; Fig. 4 a schematic representation of another fastening tab in an uncompressed and a compressed state according to an embodiment of the invention; Fig. 5 a schematic representation of another fastening tab with a locking function according to an embodiment of the invention; and Fig. 6 a schematic representation of a battery cell unit with a cell separator according to a further embodiment of the invention.

[0061] The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that can be considered independently of one another, each of which also develops the invention independently of one another. Therefore, the disclosure is intended to encompass combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0062] In the figures, the same reference symbols designate elements with the same function.

[0063] The coordinate systems shown are preferably Cartesian coordinate systems. The x-direction shown corresponds to the previously defined first direction, the y-direction shown corresponds to the previously defined third direction, and the z-direction shown corresponds to the previously defined second direction.

[0064] Fig. 1 shows a schematic and perspective view of a battery cell unit 14 with a cell separating element 10 according to an embodiment of the invention and a battery cell 16, which represents a prismatic battery cell 16. Fig. 2 shows a schematic cross-sectional view of the battery cell unit 14 from Fig. 1. Fig. 1 and Fig. 2 are described together below. The cell separation element 10 comprises a cushion 12 which has a cavity 24 filled with a fluid 15. In this case, the fluid 15 is a gas, for example, air. The cell separation element 10 comprises two walls, namely a first wall 20 and a second wall 22, between which the cavity 24 is formed, and which are joined to one another, for example, welded to one another, in an edge region 12b surrounding the cushion 12, which is also referred to as the cell separation element edge region 12b. The joint is designated here by 26. The walls 20, 22 can, for example, be made of a metallic material, for example, steel or stainless steel. Due to a thin-walled design of the walls 20, 22, the cushion is nevertheless flexible and compressible, in particular with respect to the illustrated y-direction, when external force is applied.

[0065] The peripheral edge region 12b surrounds the cushion 12, which correspondingly defines a cushion region 12a of the cell separation element 10. The two walls 20, 22 can also each be divided into a central region 20a, 22a and an edge region 20b, 22b, which surrounds the respective central region 20a, 22a in a closed manner. The cushion region 12a of the cell separation element accordingly comprises the central region 20a, 22a of the first and second walls 20, 22, as well as the cavity 24 formed between these walls 20, 22. The cell separation element edge region 12b accordingly comprises the two edge regions 20b, 22b of the respective walls 20, 22. Furthermore, one or both walls 20, 22 can be bowl-shaped in order to enclose the cavity 24 between them. In the present example, the first wall 20 in the cushion area 12b is flat, but can also be designed in a shell-shaped manner corresponding to the second wall 22.

[0066] At least a first part 30a of the first edge region 20b is designed as a fastening tab 34 and is arranged at an angle α to a second part 30b of the first edge region 20b, which adjoins the cushion region 12a and lies, for example, in a plane parallel to the cushion plane of the cushion 12. In this example, a first part 32a of the second edge region 22b is also designed as such a fastening tab 34 and is arranged at a corresponding angle α to a second part 32b of the second edge region 22b, which adjoins the cushion region 12a and also lies in the cushion plane or parallel to the cushion plane of the cushion 12. In this example, the respective first part 30a, 32a is angled relative to the respective second part 30b, 32b by an angle α that is essentially 90 degrees. The first two parts 30a, 32a form a common fastening tab 34.However, it would also be conceivable for such a fastening tab 34 to be formed by only one of the two aforementioned parts 30a, 32a. In the present example, the cell separating element 10 also has such a tab 34 on each of the two opposite sides of the cushion 12 with respect to the z-direction. Optionally, the sections 36 of the edge region 12b, of which only a few are shown in FIG. Fig. 1, such a section 36 can be formed as tabs 34 arranged on one or both sides of the cushion 12 in and / or opposite the x-direction. Such fastening tabs 34 can advantageously provide a holding or fastening option for attaching the cell separator element 10 to the battery cell 16.

[0067] The battery cell 16 has a substantially prismatic cell housing 38, which comprises a first housing side 40, which represents one of the two largest housing sides in terms of area, and on which the cell separating element 10, in particular the cushion region 12a of the cell separating element 10, is arranged. Furthermore, the housing 38 comprises a second housing side 42, which adjoins the first housing side 40, a third housing side 44, which adjoins the second housing side 42 and is opposite the first housing side 30, and a fourth housing side 46, which adjoins the first and third housing sides 40, 44 and is opposite the second housing side 42. Furthermore, the housing 38 comprises two further housing sides opposite one another with respect to the x-direction, which, however, are not provided with a reference symbol in the present case.In the present case, the tabs 34 are designed such that they bear flatly on the one hand against the second housing side 42 and on the other hand against the fourth housing side 46. Furthermore, they are shorter in the y-direction than the thickness of the battery cell 16 in the y-direction. Thus, the tabs 34 do not completely cover the cell housing 38 in the y-direction. In the present example, the tabs 34 are relatively short in the y-direction and, in particular, do not extend halfway across the cell 16 in the y-direction. However, the tabs 34 can also be longer and cover a large portion of the second or fourth side 42, 46 in the y-direction, or the entire respective housing sides 42, 46.

[0068] The protruding tabs 34 of the cell separator 10 are bent by approximately 90 degrees, creating a U-shape in this example. However, only one, two, three, or all ends, i.e., edge region sections of the edge region 12b, can be bent. In general, this enables particularly simple integration of a holding function or enclosing function and thus integration of a fixation of the cell separator 10 to a prismatic battery cell 16. This enables, for example, an axially predetermined positioning on the cell housing 38. With appropriate design, the bend, i.e., for example, the angle α, can be configured such that the friction between the bent tabs 34 and the cell housing 38 is sufficiently large to hold such a cell separator in its position after assembly and thus simplify further processing.The angle α can be chosen to be slightly smaller than 90 degrees, for example, and the tab 34 can be bendable or flexible due to its small wall thickness.

[0069] By means of additional geometric structures, such as a snap connection, a snap-in into recesses provided in the cell housing 38 can also be enabled, as will be described below with reference to Fig. 3 is described.

[0070] Fig. Figure 3 shows a schematic representation of a tab 34 for a cell separating element 10 according to an embodiment of the invention. The cell separating element 10 and its tab 34 can be designed as described above. In the present example, the tab 34 is illustrated as narrower in the x-direction, but can be just as wide, as shown, for example, in Fig. 1. Alternatively, the cell separating element 10 can also be formed, for example, with several such narrow tabs 34 arranged next to one another on the same side of the cushion 12 in a specific direction, for example, in the x-direction.

[0071] In the present example, a latching element 48, in this example a type of latching nose 50, is formed on one end of the tab 34a, which corresponds to a corresponding second latching element 52, which is arranged in the second housing side 42 of the cell 16. Fig. 3 in particular the locking of the cell separating element 10 or its tab 34 in the recess 52 in the cell housing 38 is shown, i.e. the tab 34 is in the locked state. This second locking element 52 can, for example, be designed as a corresponding depression or notch. It is also conceivable for the first locking element 48 to be designed as such a recess or notch in the end region 34a of the tab 34, while the cell housing 38, particularly in this example on the second housing side 42, is designed with a protruding locking lug or the like. In this way, the tab 34 can be locked with its tab end 34a into one side 42 of the cell housing 38 and clipped to the cell housing 38. Such a locking connection can also be referred to as a snap connection.In addition to the axial orientation, a firmly fixed position of the cell separating element 10 on the cell housing 38 is thus advantageously possible without additional material, such as adhesive.

[0072] According to a further embodiment, the length of the bent leg, i.e. the length of the tab 34 in the y-direction, can be dimensioned such that the tab 34 projects beyond or covers the entire thickness of the cell housing 38 in the y-direction, as shown schematically in Fig. 4 is shown.

[0073] Fig. 4 shows in particular a schematic representation of a further example of a fastening tab 34 for a cell separating element 10, namely in the above representation in a non-compressed, relaxed state Z1 and in Fig. 4 at the bottom in a state Z2 partially compressed by a compressive force F. In this example, the tab 34 is designed in its end region 34a with a type of hook 54, which is also elastic or resilient due to its geometry. In particular, the end region 34a is V-shaped. In the intended state of the cell separator 10, the hook can engage around a battery cell 16 on its third side 44. The flat region 56 of the tab 34, which is different from the hook 54, completely covers, for example, the second housing side 42 in the y-direction, and the hook region 54 projects beyond the cell 16 in the y-direction. If several battery cell units 14 are arranged next to one another in the y-direction, this hook 54 comes to bear against the next battery cell unit 14 in the y-direction, in particular in the edge region 12b of the cell separator 10 of the next battery cell unit 14.The contact force F can thus be achieved by arranging it on the next battery cell unit 14. The resilient action of the hook 54 advantageously provides tolerance compensation in the y-direction. Furthermore, the hook 54 can simultaneously provide a spacer function. In other words, the hook 54 can also function as a spacer 58.

[0074] Alternatively or additionally, it is possible for this hook 54 or another geometry to form a further locking element 60 (cf. Fig. 5) which engages in a corresponding locking element 62 (cf. Fig. 5) of the next cell separation element 10, for example in its edge region 12b or in the region of the shell edge R (cf. Fig. 2) can be provided as a corresponding indentation, can snap or engage.

[0075] Fig. 5 shows a schematic representation of a tab 34 for a cell separation element 10 according to a further exemplary embodiment. This tab, in turn, has a specific locking geometry 60 in the end region 34a, which can be coupled to or locked into a corresponding locking geometry 62 of a cell separation element 10 adjacent in the y-direction. This can be provided, for example, by a suitable tab 34' of the further cell separation element 10, which in turn is provided by a partial region of the second edge region 22b of the second wall 22. Alternatively, as mentioned above, this can also be formed as a suitable notch in the shell edge R.

[0076] Such an overlapping or projecting end 34a of the tab 34 of the cell separator 10 can be designed such that it can snap into a designated geometry 62 of the next cell separator 10, e.g., as soon as the battery cell units 14 of a cell stack are pressed together during assembly. This advantageously results in greater rigidity of the overall structure. This could be implemented in the swelling direction, which corresponds to the illustrated y-direction, but also transversely to the swelling direction y, i.e., for example, with respect to the x-direction. This offers an advantage in the event of lateral shock. Overall, the mechanical stability of the overall structure can be increased in the x-, y-, and z-directions. Fig. 5 shows in particular locking geometries 60, 62 of the cell separation elements 10, which enable a closed component assembly and thus an increase in the rigidity of the overall structure.

[0077] Fig.6 shows a schematic representation of a battery cell unit 14 with a cell separator 10 according to a further exemplary embodiment of the invention. This can be designed as described above, in particular with the differences or special features described below: In this case, the cell separator 10 is again designed with a tab 34 which, for example, extends over the entire width or substantially the entire width of the cushion 12 with respect to the x-direction shown. In addition, the tab 34 also extends over the entire width of the side 42 of the cell 16 in the y-direction. The end 34a is again designed with a spacer 58, which in this case, however, has a substantially round geometry and not a hook-shaped geometry. This can increase the rigidity of the spacer 58.This spacer 58 can also be designed so that it does not collide with the cushion 12 of the next cell separation element 10, against which it rests in the cell stack. In particular, this or the cushion 12 can be dimensioned and positioned so that the spacer 58 rests in the edge region 12b of the next cell separation element 10 in the cell stack.

[0078] If the tab 34 simultaneously covers a large part or a large part or almost the entire housing side 42, this results in the further advantage that an additional protective function of a neighboring cell of the present cell 16 is provided against the hot fire jet of the thermally continuous cell 16, in case its housing 38 should open in the area covered by the cell separating element 10, in particular in the area of ​​the second housing side 42.

[0079] These respective previously described special shapes of the end region 32a of such a tab 34 and in particular the projection of the tab 34 beyond the cell 16 in the y-direction enable the provision of many advantageous functions. For example, this makes it possible to fix the cell separating element 10 on the cell 16, e.g. by designing the tab ends 34a in the form of, for example, a snap connection 52. The legs, i.e. tabs 34, can be designed with regard to their width in the x-direction as the same width as the rest of the cell separating element 10 or the cushion 12 or the second part 30b, 32b of the respective walls 20, 22, or they can also be shorter or less wide. The ends 34a can additionally or alternatively be designed, in particular with regard to shape and / or thickness, such that they simultaneously form an elastic frame function 58 to the next cell 16 or cell unit 14.This can also be implemented across the entire width of the cell separator 10 in the x-direction or only over a partial length in the x-direction. This also offers the advantage of realizing the frame 58 provided by the spacer 54 with a certain spring force, as exemplified by the V-shape of the hook 54 shown. However, other geometries are also suitable for this purpose. Furthermore, the cell separator 10 can be locked to another cell separator 10 via locking geometries 60, 62.

[0080] Overall, the examples show how the invention can provide a cell separation element with a pressure cooling pad and integrated fixation.

Claims

[1] Cell separator element (10) for arrangement on a prismatic battery cell (16), characterized by , that - the cell separation element (10) has a first wall (20) and a second wall (22) opposite thereto, between which a cavity (24) filled or fillable with a fluid (15) is formed, whereby a cushion (12) filled or fillable with the fluid (15) is provided, - wherein the cell separating element (10) is divided into a cushion region (12a) and a cell separating element edge region (12b) which surrounds the cushion region (12a) in a circumferential direction and which delimits the cushion (12) in and against a first direction (x) and in and against a second direction (z), and which comprises a first edge region (20b) of the first wall (20) and a second edge region (22b) of the second wall (22), - wherein the first wall (20) and the second wall (22) are connected to one another in the cell separating element edge region (12b), - wherein a first part (30a) of the first edge region (20b) is designed as a fastening tab (34) and is arranged at an angle (α) to a second part (30b) of the first edge region (20b) adjacent to the cushion region (12a), wherein the cell separating element (10) is held or can be fastened to the battery cell (16) by means of the fastening tab (34). [2] Cell separating element (10) according to claim 1, characterized by that the first part (30a) of the first edge region (20b) is arranged at an angle such that, when the cushion region (12a) of the cell separating element (10) is arranged on a first housing side (40) of the battery cell (16), the first part (30a) of the first edge region (20b) can be placed or laid flat on a second housing side (42) of the battery cell (16) adjacent to the first housing side (40). [3] Cell separation element (10) according to one of the preceding claims, characterized byin that the cell separating element (10) comprises a plurality of fastening tabs (34), each of which is formed as a first part (30a, 32a) of the first and / or second edge region (20b, 22b), in particular wherein the cell separating element (10) comprises a first and a second fastening tab (34) which are arranged on opposite sides of the cushion (12) with respect to the first direction (x) or the second direction (z). [4] Cell separation element (10) according to one of the preceding claims, characterized by that the first part (30a) of the edge region (20b) is as wide as the second part (30b) of the edge region (20b) or less wide. [5] Cell separation element (10) according to one of the preceding claims, characterized byin that the at least one fastening tab (34) comprises a first latching element (48) which, when the cushion region (12a) of the cell separating element (10) is arranged on a first housing side (40) of the battery cell (16), can be coupled in a latching manner to a corresponding second latching element (52) of a second housing side (42) of the battery cell (16) adjacent to the first housing side (40). [6] Cell separation element (10) according to one of the preceding claims, characterized by that the at least one fastening tab (34) is formed with a spacer (58) at a tab end (34a), in particular wherein the fastening tab (34) projects beyond the battery cell (16) in the third direction (y) when the cushion region (12a) of the cell separating element (10) is arranged on the first housing side (40) of the battery cell (16). [7] Cell separating element (10) according to claim 6, characterized bythat the spacer (58) is designed as a hook (54) folded over at the end, which, when the cushion region (12a) is arranged on the first housing side (40), engages over a third housing side (44) of the battery cell (16), which adjoins the second housing side (42) and is opposite the first housing side (40). [8] Cell separation element (10) according to one of the preceding claims, characterized by that the cell separating element (10) has a third locking element (62) for locking connection to a locking element (60) of a specific locking geometry and the fastening tab (34) at the tab end (34a) has a fourth locking element (60) with the specific locking geometry for locking into another similar cell separating element (10). [9] Battery arrangement (14) with a cell separator (10) according to one of the preceding claims and at least one battery cell (16). [10] Method for producing a cell separating element (10) for arrangement on a prismatic battery cell (16), characterized by , that - the cell separation element (10) is formed with a first wall (20) and a second wall (22) opposite thereto, between which a cavity (24) filled or fillable with a fluid (15) is formed, whereby a cushion (12) filled or fillable with the fluid (15) is provided, - wherein the cell separating element (10) is divided into a cushion region (12a) and a cell separating element edge region (12b) which surrounds the cushion region (12a) in a circumferential direction and which delimits the cushion (12) in and against a first direction (x) and in and against a second direction (z), and which comprises a first edge region (20b) of the first wall (20) and a second edge region (22b) of the second wall (22), - wherein the first wall (20) and the second wall (22) are connected to one another in the cell separating element edge region (12b), - wherein a first part (30a) of the first edge region (20b) is designed as a fastening tab (34) and is angled at an angle (α) to a second part (30b) of the first edge region (20b) adjacent to the cushion region (12a) and lying in a cushion plane of the cushion (12), wherein the cell separating element (10) is held or attachable to the battery cell (16) by means of the fastening tab (34).

Images