Method for producing a battery cell arrangement for a traction battery of a motor vehicle and corresponding production device

Abstract

The invention relates to a method for producing a battery cell arrangement (2) for a traction battery of a motor vehicle, wherein the battery cell arrangement (2) is compressed by means of a press (11) and subsequently clamped. Provision is made for the battery cell arrangement (2), which is arranged displaceably on a workpiece carrier (7), to be compressed by a relative movement of two pressing jaws (12, 13) of the press (11) arranged on opposite sides of the battery cell arrangement (2), wherein a relative speed of the pressing jaws (12, 13) to one another is set to different specified values ​​in different process stages and / or is determined and set using different parameters. The invention further relates to a manufacturing device (1) for producing a battery cell arrangement (2) for a traction battery of a motor vehicle.

Description

The invention relates to a method for producing a battery cell arrangement for a traction battery of a motor vehicle, wherein the battery cell arrangement is compressed by means of a press and subsequently braced. The invention further relates to a manufacturing device for manufacturing a battery cell arrangement for a traction battery of a motor vehicle.The prior art discloses, for example, the publication WO 2022 / 128953 A1. This describes a stacking device for receiving, positioning and fixing the cell components of a fuel cell layer structure during the production, comprising a vertically movable base plate on which a lower edge component of the fuel cell layer structure is to be deposited, and a guide system having at least one guide element which extends in the direction of movement of the base plate for lateral contact of the cell components and is designed to move with the base plate in the vertical direction and / or, when the edge component is placed, to be positioned laterally across the latter for contacting the further cell components to be placed thereon.It is an object of the invention to propose a method for producing a battery cell arrangement for a traction battery of a motor vehicle, which method has advantages over known methods, in particular enables the battery cell arrangement to be compressed with little time and correspondingly short cycle time.According to the invention, this is achieved by a method for producing a battery cell arrangement for a traction battery of a motor vehicle. It is provided here that the battery cell arrangement arranged displaceably on a workpiece carrier is compressed by a relative movement of two press jaws of the press arranged on opposite sides of the battery cell arrangement, wherein a relative speed of the press jaws to one another is set to different predefined values in different process sections and / or is determined and set on the basis of different parameters.Advantageous embodiments with expedient developments of the invention are specified in the dependent claims. It is pointed out that the exemplary embodiments explained in the description are not restrictive; rather, any variations of the features disclosed in the description, the claims and the figures can be realized.The method is for manufacturing the battery cell assembly for the traction battery. The battery cell arrangement forms a component of the traction battery, for example, when producing the traction battery, one or more battery cell arrangements are arranged in a common battery housing. The traction battery is preferably part of the motor vehicle, but it can of course also be present separately therefrom, in particular until the traction battery is mounted on or in the motor vehicle. The traction battery is provided and configured for temporarily storing electrical energy for a drive device of the motor vehicle. The drive device serves for driving the motor vehicle, in this respect thus for providing a drive torque directed to driving the motor vehicle.To provide the drive torque, the drive device has at least one drive unit which is designed as an electric traction machine which is electrically connected to the traction battery. The electrical energy temporarily stored in the traction battery is used in this respect at least temporarily for driving the motor vehicle, that is to say for providing the drive torque directed to driving the motor vehicle by means of the drive device or the drive unit. Conversely, it may be provided that electrical energy generated by means of the drive device is temporarily stored in the traction battery.The traction battery preferably has a battery housing and at least one cell module, wherein the cell module is provided and configured for intermediate storage of the electrical energy. For this purpose, it has one or more battery cells, preferably a plurality of battery cells electrically interconnected with one another. The battery cells are preferably designed as prismatic cells or as pouch cells. A cell module receptacle is formed in the battery housing, which is provided and configured to receive the cell module. During the production of the traction battery, the cell module is inserted into the cell module receptacle. Preferably, not only is a single cell module arranged in the battery housing, but a plurality of cell modules are introduced into the battery housing. In such an embodiment, the battery housing has a cell module receptacle which is designed to receive a plurality of cell modules, or a plurality of cell module receptacles.The battery cell or the battery cells of the cell module form a component of the battery cell arrangement. Additionally, the battery cell assembly may include a cell module housing of the cell module. For example, the cell module housing has at least two end plates which accommodate the battery cell or the battery cells between them. In this respect, the end plates are arranged on opposite sides of the battery cell or of the battery cells. The battery cell arrangement is preferably cuboidal or at least approximately cuboidal.If the battery cell arrangement has a plurality of battery cells, these are preferably electrically connected to one another or are connected to one another at least during the production of the traction battery and / or of the battery module. For this purpose, the battery cells are arranged, for example, in such a way that their electrical connections are arranged on the same side. The terminals are electrically connected to one another by a plurality of busbars, which are preferably also electrically connected to electrical terminals of the cell module. In other words, the battery cells are electrically connected to the terminals via the busbars.The battery cell arrangement is thus composed at least of the at least one battery cell, i.e. exactly one battery cell or a plurality of battery cells. On both sides of the at least one battery cell or of the plurality of battery cells, the two end plates are optionally arranged, which in this respect accommodate the at least one battery cell or the battery cells between them. In the case of the plurality of battery cells, a cell separating element is preferably present between at least two of the battery cells. The cell separation element is preferably designed to be electrically insulating and / or elastic.Over time, the at least one battery cell may expand, in particular during charging or discharging of the traction battery. This expansion can also be referred to as "swelling". To counter expansion, the battery cell assembly is typically mechanically stressed. For this purpose, the battery cell arrangement is acted upon by a clamping force with the aid of a clamping device, for example having at least one clamping band, by means of which clamping force the battery cell arrangement is acted upon by a contact pressure directed counter to the expansion. The clamping force acts in this case against an expansion force which is exerted by the expansion of the battery cell arrangement on the clamping device or the at least one clamping band. The clamping band is present, for example, in the form of a metal band.In the case of the elastic configuration of the cell separating element, the latter is elastically compressed by the expansion of the at least one battery cell, such that overall the expansion force is reduced. The clamping device or the clamping band is usually arranged in the open state around the battery cell arrangement and is subsequently closed and subsequently clamped in order to bring about the contact pressure. In particular, the tightening strap is welded to the battery cell arrangement, in particular to at least one of the end plates of the battery cell arrangement. However, it can also be provided to apply a circumferentially closed tightening strap to the battery cell arrangement.In any case, however, it is necessary to compress the battery cell arrangement before the battery cell arrangement is braced. The compressing of the battery cell assembly is performed using the press. The compression takes place in that the battery cell arrangement is initially arranged displaceably on a workpiece carrier. Subsequently, it is compressed by means of press jaws of the press arranged opposite the battery cell arrangement, namely by displacing the press jaws towards each other, i.e. performing a relative movement towards each other. For compressing the battery cell assembly, for example, a first of the jaws engages a first of the end plates of the battery cell assembly and a second of the jaws engages a second of the end plates of the battery cell assembly. This engagement can be effected directly or only indirectly, in the latter case for example via the workpiece carrier.Due to the relative movement of the press jaws towards each other, the end plates are displaced towards each other and correspondingly the at least one battery cell arranged between them is compressed. The relative movement of the press jaws towards each other takes place at the relative speed. The relative speed of the press jaws thus describes a speed of the press jaws relative to one another. In the course of the relative movement, it can be provided that one of the press jaws is stationary and the respective other of the press jaws is displaced towards it. However, it can also be provided to displace the two press jaws towards one another.In order to achieve high process safety on the one hand and to reduce a time required for compressing the battery cell arrangement on the other hand, the compressing of the battery cell arrangement is divided into a plurality of process sections. Each of the process sections is directed towards compressing the battery cell arrangement, such that in all process sections the press jaws are displaced towards each other. A relaxation process section which follows the process section and in which the press jaws are displaced away from one another is therefore no longer attributable to the process sections.It is known to move the press jaws towards one another at a constant speed or with application of a constant force. However, this leads to a comparatively long production time of the battery cell arrangement, since the press jaws normally do not initially bear against the battery cell arrangement. Due to tolerances of the battery cell arrangement, it is namely necessary to set the pressing jaws between them before arranging the battery cell arrangement to a distance from one another which is greater than dimensions of the completely relaxed battery cell arrangement in the same direction, taking all tolerances into account. Accordingly, the distance between the dies and a first battery cell assembly may be different than the distance between the dies and another second battery cell assembly.For this reason, according to the invention, it is provided that the relative speed is set to different predefined values in the different process sections and / or is determined and set on the basis of different parameters. This means that the relative speed of the press jaws in the different process sections is chosen to be different, namely by setting it either to the different preset values or by determining it on the basis of different parameters.It is provided in particular to displace the pressing jaws towards one another at a higher first relative speed until they both bear against the battery cell arrangement. As soon as the press jaws each bear against the battery cell arrangement, the relative speed is lowered to a lower second relative speed in order to avoid damage to the battery cell arrangement during the compression. The different preset values for the relative speed can be selected to be constant or they result from their determination from the different parameters.For example, the relative speed is determined in a first process section on the basis of a first parameter and in a second process section on the basis of a second parameter different from the first parameter. The parameters are each selected from the following parameters: distance of the press jaws from one another, dimensions of the battery cell arrangement, distance of the press jaws from the battery cell arrangement and pressing force exerted by the press jaws on the battery cell arrangement. With the described procedure, the production time of the battery cell arrangement can be significantly reduced.A further development of the invention provides that a constant first setpoint speed is used as a parameter in at least a first of the process sections and the relative speed is set to the first setpoint speed. In the first process section, the first setpoint speed is therefore used as a predefined value for the relative speed or the first setpoint speed is used as a parameter for ascertaining the relative speed. Accordingly, the relative speed is set to the first setpoint speed and the press jaws are displaced towards one another at this speed. The first set speed is selected to rapidly overcome a previously present distance between the dies and the battery cell assembly to reduce the battery cell assembly fabrication time.A further development of the invention provides that, when a first force threshold value is reached by a pressing force exerted by the pressing jaws on the battery cell arrangement, the first process section is ended and a second of the process sections is initiated. During the first process section, the pressing force is thus monitored, which is impressed by the press jaws on the battery cell arrangement or which acts between the press jaws and the battery cell arrangement. If this pressing force exceeds the first force threshold value, it is assumed that the pressing jaws each bear against the battery cell arrangement and the actual compression of the battery cell arrangement begins. The first force threshold is accordingly selected to indicate contact of the dies with the battery cell assembly. Such a procedure enables the battery cell arrangement to be produced with high efficiency and in particular with a short production time.A further development of the invention provides that a constant second setpoint speed is used as a parameter in the second process section and the relative speed is set to the second setpoint speed, and / or that the pressing force and / or a relative position of the press jaws with respect to one another is used as a parameter in the second process section and the relative speed is determined and set on the basis of the parameter, in particular on the basis of the pressing force and / or the relative position. In the second process section, therefore, it is possible to proceed analogously to the first process section, namely the relative speed is set to the second setpoint speed and the press jaws are displaced accordingly.The second setpoint speed is selected here to be smaller than the first setpoint speed, for example it is at most 50%, at most 30% or at most 20% of the first setpoint speed. Additionally or alternatively, the relative speed is determined on the basis of the pressing force and / or the relative position, i.e. the relative speed is present as a function of the pressing force and / or the relative position. The relative position is to be understood in particular as a distance of the press jaws from one another. The use of the pressing force as a parameter enables a force-dependent compression of the battery cell arrangement, in particular until a specific pressing force is reached.The pressing force occurring during the compression of the battery cell arrangement is also dependent, inter alia, on the tolerances of the battery cell arrangement. This applies in particular to the tolerances of the individual battery cells. If, for example, a plurality of comparatively thick battery cells are assigned to the battery cell arrangement, the pressing force increases more rapidly during the compression than in the case of thinner battery cells. Moreover, after the battery cell assembly is removed from the press, a greater elongation occurs for the thicker battery cells than for the thinner battery cells, and the battery cell assembly thus increases by a greater amount of elongation.In order nevertheless to set the battery cell arrangement to specific dimensions to which it sets after its removal from the press, provision can be made for the press jaws to be displaced further towards one another at a relatively high pressing force, that is to say for an end position of the press jaws to be selected in such a way that the press jaws have a smaller spacing than at a relatively low pressing force. In other words, the end position of the press jaws is selected as a function of the pressing force, namely in such a way that a distance of the press jaws from one another in the end position is the smaller the greater the pressing force. This achieves the aforementioned, required compression of the battery cell arrangement.A further development of the invention provides that after reaching a desired relative position by the relative position of the press jaws to one another and / or after reaching a second force threshold value by the pressing force, the battery cell arrangement is fixed by means of at least one fixing device and the press jaws are moved for releasing the battery cell arrangement, wherein the at least one fixing device fixes opposing elements of the workpiece carrier to one another, in particular in such a way that the opposing elements move away from one another by a specific amount of elongation during release of the battery cell arrangement.If the relative position of the target relative position and / or the pressing force corresponds to the second force threshold value, it is assumed that the battery cell arrangement has been compressed sufficiently by means of the press. Accordingly, the pressing jaws are subsequently moved, namely away from each other, for releasing the battery cell arrangement, so that the pressing force is reduced. In particular, the press jaws are moved such that at least one of the press jaws is spaced apart from the battery cell arrangement. Before or during the movement of the pressing jaws for releasing the battery cell arrangement, the battery cell arrangement is fixed by means of the at least one fixing device. This is to be understood to mean that the opposing elements of the workpiece carrier are fixed relative to one another.The oppositely disposed elements of the workpiece carrier are understood to be, for example, elements against which the end plates and / or the at least one battery cell of the battery cell arrangement bear. The fixing is effected by connecting the two opposing elements to one another. For example, this is done in such a way that a length of the battery cell arrangement by a specific amount, namely by the specific amount of elongation, is permitted. The elongation measure is selected such that after relaxing the battery cell arrangement by the elongation measure, i.e. moving the opposing elements away from one another by the elongation measure, the battery cell arrangement has the desired external dimensions. This realizes a high process safety since the battery cell arrangement can subsequently be assigned to the traction battery with a high accuracy of fit.A further development of the invention provides that the desired relative position is determined as a function of the pressing force, in particular as a function of the pressing force present when a specific intermediate relative position is reached by the relative position. Such a procedure has already been pointed out. It serves for force-dependent compression of the battery cell arrangement, in particular force-dependent overpressing. The desired relative position of the press jaws, which corresponds in particular to their distance at the end of the compression, is determined as a function of the pressing force. Here, for example, the pressing force is determined at a specific relative position of the press jaws and the desired relative position is calculated therefrom. In particular, the pressing force is detected when the relative position corresponds to the intermediate relative position. Such a procedure enables the already mentioned advantages to be achieved.A further development of the invention provides that at least one of the devices mentioned below is used as the at least one fixing device: a holding clamp of the workpiece carrier and a fixing element fastened to the opposite elements. The workpiece carrier has two guide plates. For example, one of the guide plates is rigidly fastened to the workpiece carrier, whereas another of the guide plates is present on the workpiece carrier in a displaceable, in particular linearly displaceable manner. Preferably, it is provided that the guide plates abut the press jaws during the compression of the battery cell arrangement. The displaceable guide plate can be fixed in a positive-locking manner by means of the holding clamp. The holding clamp can be arranged in different positions in this respect and, in a first position, releases the guide plates for displacement and, in a second position, fixes them in a form-fitting manner.Additionally or alternatively, the fixing element is provided, which is fastened to the opposite elements in each case. For example, the fixing element is in the form of a pull rod which is fastened, in particular screwed, on the one hand to one of the guide plates and on the other hand to another of the guide plates. Particularly preferably, the battery cell arrangement is fixed both with the aid of the holding clamp and using the fixing element in order to at least substantially hold the dimensions of the battery cell arrangement away from the press, in particular until the already mentioned clamping strap is arranged on the battery cell arrangement. This achieves the advantages already mentioned.A further development of the invention provides that during the movement of the press jaws for releasing the battery cell arrangement, the pressing force exerted by the press jaws on the battery cell arrangement is detected, in particular for determining an end dimension of the battery cell arrangement. The pressing force is therefore also still detected after the compression of the battery cell arrangement, in particular while the pressing jaws are moved away from one another in order to expand the battery cell arrangement. This makes it possible to reliably determine the elongation measure and, accordingly, the final measure of the battery cell arrangement. On the basis of the pressing force detected during the relaxation of the battery cell arrangement, preferably on the basis of the elongation measure and / or the final measure, a judgment of the battery cell arrangement is carried out. If the pressing force, the elongation measure and / or the final measure are beyond a tolerance range, a fault in the battery cell arrangement is detected. However, if the said size is within the tolerance range, a properly produced battery cell arrangement is detected. This results in reliable quality control of the battery cell arrangement.A further development of the invention provides that, if a maximum value is exceeded by the pressing force during the compression of the battery cell arrangement and / or a minimum value is undershot by the pressing force, an error is indicated when the relative position reaches a setpoint relative position. The battery cell arrangement and in particular its at least one battery cell are comparatively sensitive. In particular, it is necessary for a functional traction battery that certain manufacturing parameters are observed during the manufacturing of the battery cell arrangement.If the pressing force exceeds the maximum value during the compression of the battery cell assembly, it can be assumed that the battery cell assembly has been excessively compressed. Consequently, the error is indicated. Additionally or alternatively, the error is displayed if a pressing force is present when the relative position reaches the defined desired relative position, which is smaller than the minimum value. In this case, it is assumed that the dimensional accuracy of the battery cell arrangement is not given. Preferably, it is provided that in the respectively reverse case, i.e. if no fault is indicated, a proper production of the battery cell arrangement is detected. This procedure also serves for reliable quality control.The invention further relates to a production device for producing a battery cell arrangement for a traction battery of a motor vehicle, in particular by carrying out the method according to one or more of the preceding claims, wherein the production device is provided and configured to compress the battery cell arrangement by means of a press and subsequently clamp it. In this case, the production device is further provided and configured to compress the battery cell arrangement, which is arranged displaceably on a workpiece carrier, by a relative movement of two press jaws of the press, which press jaws are arranged on opposite sides of the battery cell arrangement, wherein a relative speed of the press jaws with respect to one another is set to different predefined values in different process sections and / or is determined and set on the basis of different parameters.The advantages of such a procedure or such a configuration of the production device have already been pointed out. Both the production device and the method for operating it can be further developed according to the explanations in this description, so that in this respect reference is made to it.The features and combinations of features described in the description, in particular the features and combinations of features described in the following description of the figures and / or shown in the figures, can be used not only in the respectively specified combination but also in other combinations or alone without departing from the scope of the invention. Embodiments are therefore also to be considered as encompassed by the invention which are not explicitly shown or explained in the description and / or the figures, but which emerge from the explained embodiments or can be derived from them.The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without any restriction of the invention being effected. The following shows: FIG. 1 shows a schematic illustration of a production device for producing a battery cell arrangement for a traction battery of a motor vehicle during different production steps of the battery cell arrangement, and FIG. 2 is a graph in which a pressing force exerted by the manufacturing apparatus on the battery cell assembly is plotted against a relative position of press jaws of a press of the manufacturing apparatus.FIG. 1 shows a schematic illustration of a production apparatus 1 which is provided and configured for producing a battery cell arrangement 2. The battery cell arrangement 2 has at least one battery cell 3, in the exemplary embodiment shown here a plurality of battery cells 3, only some of which are identified by way of example. Furthermore, the battery cell arrangement 2 has two end plates 4 and 5, which are part of a cell module housing of the battery cell arrangement 2. A cell separating element 6 is arranged between each two of the battery cells 3, wherein only some of the cell separating elements 6 shown are again identified by way of example.The individual elements of the battery cell arrangement 2, i.e. the at least one battery cell 3, the end plates 4 and 5 and the cell separating elements 6, are arranged on a workpiece carrier 7 such that they can be displaced in the direction of a longitudinal axis of the battery cell arrangement 2. The workpiece carrier 7 has two guide plates 8 and 9 which are connected to one another via at least one rail 10. For example, a first guide plate 8 is mounted displaceably on the rail 10, namely likewise in the longitudinal direction. The respective other second guide plates 9, on the other hand, are rigidly connected to the rail 10.During a manufacturing process of the battery cell arrangement 2, the battery cell arrangement is introduced on the workpiece carrier 7 into a press 11 of the manufacturing apparatus 1. The press 11 has press jaws 12 and 13, wherein the press jaw 12 is displaceable in the longitudinal direction by means of a piston 14. The press jaw 13, on the other hand, is rigidly connected to an actuator 15, by means of which the piston 14 and thus the press jaw 12 can be displaced. The pressing jaws 12 and 13 are connected to each other via a workpiece table 16. The workpiece carrier 7 together with the battery cell arrangement 2 is arranged on the workpiece table 16.On the side opposite the workpiece table 16 with respect to the battery cell arrangement 2, the press jaws 13 and the actuator 15 are fastened to one another by means of a retaining bracket 17. This is optional and serves for better absorption of the forces acting during the compression of the battery cell arrangement 2 by means of the press 11. In addition to the guide plates 8 and 9, a holding clamp 18 is rotatably mounted on the workpiece carrier 7. By means of this, the displaceable guide plate 8 can be fixed in such a way that a release of the battery cell arrangement 2 is at least partially prevented.In the top illustration, the production apparatus 1 is illustrated during a first process section. In this, the pressing jaw 12 is spaced apart from the guide plate 8 and the battery cell arrangement 2 is completely relaxed. During the first process section, the press jaw 12 is displaced at a first relative speed towards the second press jaws 13.In the second illustration from above, the battery cell arrangement 1 is illustrated during a second process section. During this, the press jaw 12 is displaced towards the press jaw 13 at a second relative speed which is lower than the first relative speed. This displacement is carried out until the press jaws 12 and 13 have reached a desired relative position with respect to one another. This is shown from above in the third illustration.After this desired relative position has been reached by the relative position of the pressing jaws 12 and 13 with respect to one another, the battery cell arrangement 2 is fixed by means of a first fixing device 19 and a second fixing device 20. The first fixing device 19 is the holding clamp 18, which is adjusted in such a way that it fixes the guide plates 8 and 9 and thus also the end plates 4 and 5 to one another. The second fixing device 20 is formed by a fixing element 21, which is present, for example, in the form of a pull rod, which is screwed to both guide plates 8 and 9.After the compression of the battery cell arrangement 2 during the corresponding process sections and their subsequent fixing, the press jaws 12 and 13 are displaced away from one another, in particular the press jaw 12 is displaced in the direction facing away from the press jaw 13. As a result, the battery cell arrangement 2 partially relaxes, so that it becomes larger by a certain extent of elongation until it is finally present in its final extent. In this state, the battery cell arrangement 2 is removed from the press 11 together with the workpiece carrier 7. Before or only subsequently, the battery cell arrangement 2 is tensioned, in particular by means of a tension strap.FIG. 2 shows a diagram in which a curve 22 describes the pressing force F over the relative position s of the press jaws 12 and 13. At the beginning of the first process section, the pressing force is equal to zero or at least less than a first force threshold value F 1. During the first process section, the press jaws 12 and 13 are displaced 0 to one another starting from the relative position s. If the pressing force reaches the first force threshold value F 1, then contact of the pressing jaws 12 and 13 with the battery cell arrangement 2 is detected. If the relative position is smaller than the relative position s 1 or larger than the relative position s 2, then incorrect dimensions of the battery cell arrangement 2 are detected. Otherwise, the battery cell arrangement 2 is classified as okay and is changed from the first process section to the second process section.In the second process section, the pressing force increases significantly more quickly. If the pressing force exceeds a maximum value F 2, a fault is detected during the compression of the battery cell arrangement 2. It can be seen that the second process section can be divided into two partial sections. In a first subsection, the pressing force increases, namely up to a pressing force F 2. It then falls down to a pressing force F 3. During the subsequent expansion of the battery cell arrangement 2, the pressing force finally falls to a value F 4. If the pressing force F 3 is within a pressing force range ΔF, it is assumed that the compression of the battery cell assembly 2 has successfully expired and the battery cell assembly 2 is in order. Otherwise, if the pressing force F 3 is outside the pressing force range ΔF, an error is detected during the compression.The described procedure enables a particularly reliable quality control of the battery cell arrangement 2. in particular, the compression of the battery cell arrangement 2 is monitored without gaps with the aid of the production apparatus 1 or the press 11 and can also be carried out with a short production time. This is achieved in particular by the relative speed of the press jaws 12 and 13 to one another being chosen differently in the different process sections or being determined on the basis of different parameters.LIST OF REFERENCE CHARACTERS:1 Production device 2 Battery cell arrangement 3 Battery cell 4 End plate 5 End plate 6 Cell separating element 7 Workpiece carrier 8 Guide plate 9 Guide plate 10 Rail 11 Press 12 Press jaw 13 Press jaw 14 Piston 15 Actuator 16 Workpiece table 17 Holding bracket 18 Holding clamp 19 1 Fixing device 20 2 Fixing device 21 Fixing elementReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedWO 2022 / 128953 A1

[0002]

Claims

Method for producing a battery cell arrangement (2) for a traction battery of a motor vehicle, wherein the battery cell arrangement (2) is compressed by means of a press (11) and subsequently braced, characterized in that the battery cell arrangement (2) arranged displaceably on a workpiece carrier (7) is compressed by a relative movement of two press jaws (12, 13) of the press (11) arranged on opposite sides of the battery cell arrangement (2), wherein a relative speed of the press jaws (12, 13) with respect to one another is set to different predefined values in different process sections and / or is determined and set on the basis of different parameters.Method according to Claim 1, characterized in that, in at least a first of the process sections, a constant first setpoint speed is used as parameter and / or the relative speed is set to the first setpoint speed.Method according to one of the preceding claims, characterized in that, when a first force threshold value is reached by a pressing force exerted by the pressing jaws (12, 13) on the battery cell arrangement (2), the first process section is ended and a second of the process sections is initiated.Method according to one of the preceding claims, characterized in that in the second process section a constant second setpoint speed is used as a parameter and / or the relative speed is set to the second setpoint speed, and / or in that in the second process section the pressing force and / or a relative position of the press jaws (12, 13) with respect to one another is used as a parameter and the relative speed is determined and set on the basis of the parameter.Method according to one of the preceding claims, characterized in that, after a desired relative position is reached by the relative position of the press jaws (12, 13) with respect to one another and / or after a second force threshold value is reached by the pressing force, the battery cell arrangement (2) is fixed by means of at least one fixing device (19, 20) and the press jaws (12, 13) are moved in order to expand the battery cell arrangement (2), wherein the at least one fixing device (19, 20) fixes elements of the workpiece carrier (7) opposite one another.Method according to one of the preceding claims, characterized in that the desired relative position is determined as a function of the pressing force.Method according to one of the preceding claims, characterized in that at least one of the devices mentioned below is used as the at least one fixing device (19, 20): a holding clamp (18) of the workpiece carrier (7) and a fixing element (21) fastened in each case to the opposite elements.Method according to one of the preceding claims, characterized in that during the movement of the press jaws (12, 13) for releasing the battery cell arrangement (2), the pressing force exerted by the press jaws (12, 13) on the battery cell arrangement (2) is detected.Method according to one of the preceding claims, characterized in that, if a maximum value is exceeded by the pressing force during the compression of the battery cell arrangement (2) and / or a minimum value is undershot by the pressing force, an error is indicated when the relative position reaches a setpoint relative position.Production device (1) for producing a battery cell arrangement (2) for a traction battery of a motor vehicle, in particular for carrying out the method according to one or more of the preceding claims, wherein the production device (1) is provided and configured to compress the battery cell arrangement (2) by means of a press (11) and subsequently clamp it, characterized in that the production device (1) is further provided and configured to compress the battery cell arrangement (2) arranged displaceably on a workpiece carrier (7) by means of a relative movement of two press jaws (12, 13) of the press (11) arranged on opposite sides of the battery cell arrangement (2), wherein a relative speed of the press jaws (12, 13) with respect to one another is set to different predefined values in different process sections and / or is determined and set on the basis of different parameters.

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