Battery module with a clamping device for clamping battery cells

Abstract

The invention relates to a battery module (1) with a clamping device for clamping battery cells (3', 3'', 3'''). The battery module (1) has a clamping device with a plurality of separating elements (2), wherein a plurality of battery cells (3', 3'', 3''') arranged one behind the other along a stacking direction (Y) are arranged in the clamping device, wherein a separating element (2) of the plurality of separating elements (2) is arranged between adjacent battery cells (3', 3'', 3''') in each case, such that the separating elements (2) each delimit, in pairs, a receiving space (4) for a battery cell (3'') arranged between the respective pair of separating elements (2), wherein the respective pair of adjacent separating elements (2) exerts a clamping force on the battery cell (3'') arranged between the respective pair, wherein the clamping device has electromechanical actuators (5'') assigned to the respective pair.wherein the separating elements (2) of the respective pair are coupled to one another via the electromechanical actuator (5'') assigned to the pair, wherein a distance (a'') between the pair of separating elements (2) can be changed by controlling the actuator (5'') assigned to the pair, whereby a clamping force on the battery cell (3'') arranged between the pair of separating elements (2) can be changed.

Description

[0001] The invention relates to a battery module with a clamping device for clamping battery cells.

[0002] In electrically or partially electrically powered vehicles, numerous battery cells are usually connected together to form a high-voltage battery, also known as a traction battery. Such a high-voltage battery usually consists of several hundred, sometimes up to several thousand battery cells. The battery cells of the high-voltage battery are usually connected together to form battery modules, i.e. subgroups, with these battery modules typically having an identical number of battery cells. The battery cells are usually stacked in one stacking direction, thus forming a battery cell stack, which is then introduced, in particular pushed, into a battery module housing. Typically, a high-voltage battery has several battery modules. However, it is also entirely conceivable for the high-voltage battery to have only a single battery module.

[0003] There are different types of battery cells. One type of battery cell is the so-called pouch cell, also known as a coffee bag cell. In pouch cells, the stacked or folded active anode layers, cathode layers, separator layers, and the electrolyte are enclosed in a flexible, usually aluminum-based outer shell, usually in the form of a welded foil. The terminal lugs, namely the anode terminal lug and the cathode terminal lug, then protrude from the outer shell to enable electrical contact with the battery cell. These terminal lugs are also often referred to as cell tabs. Another type of battery cell is the prismatic cell, which, unlike pouch cells, has a solid housing, usually made of metal. Prismatic cells can be combined in relatively simple housings to form battery modules or battery systems.Pouch cells require installation in a housing that must meet higher mechanical requirements.

[0004] Pouch cells potentially have the highest volumetric and gravimetric energy density because they do not require their own rigid housing. Since pouch cells are compliant, they must always be protected by a rigid housing. Furthermore, to ensure a long service life, pouch cells must be continuously subjected to external pressure. The housing for pouch cells must therefore be able to provide this pressure or the appropriate mechanical stress.

[0005] In order to ensure a long service life and operational reliability of the battery cells, the battery cells of a battery cell stack are usually tensioned in the thickness direction, insofar as the battery cell stack is compressed in the thickness direction, already at BOL (Begin of Life).

[0006] During operation of the high-voltage battery, irreversible and reversible changes in the volume of the battery cell occur due to charging and discharging processes. These effects are often referred to as swelling (irreversible processes) and breathing (reversible processes). With increasing operating age of the battery cells, the irreversible increase in volume increases. In a battery cell stack, the linear expansion of the battery cell stack in the stack direction changes during operation due to the change in volume or thickness of the battery cells. The components intended for the initial clamping of the battery cells can generally no longer be changed over the service life or during operation of the vehicle, so the clamping forces acting on the battery cells depend on the initial setting of the clamping forces and the changing expansion of the battery cells during operation.If the battery cells are initially clamped, for example, using a clamping device with fixed clamping elements whose spacing is thus unchangeable, the clamping force acting on the battery cells depends on the current expansion of the battery cell(s). This can lead to undesirably high clamping forces acting on the battery cells. Therefore, there is a need to dynamically adjust the clamping of the battery cells during vehicle operation.

[0007] DE 10 2018 103 305 A1 discloses a battery module with at least one cell and a method for operating such a battery module. It is provided that the contact pressure of the cell is adjusted depending on the actual state of the cell by means of a control loop, wherein the pressure can be varied via a controllable actuator.

[0008] DE 10 2020 214 014 A1, US 2023 / 0066229 A1 and US 2021 / 0226246 A1 disclose further prior art.

[0009] The object of the present invention is to provide a novel battery module that enables dynamic adjustment of the clamping forces acting on the battery cells.

[0010] This problem is solved by the subject matter of the independent patent claims. The dependent claims relate to advantageous developments of the invention.

[0011] The battery module according to the invention is a battery module of a high-voltage battery. The battery module has a clamping device with a plurality of separating elements, wherein a plurality of battery cells arranged one behind the other along a stacking direction are arranged in the clamping device, wherein a separating element of the plurality of separating elements is arranged between adjacent battery cells in each case, such that the separating elements, in pairs, delimit a receiving space for a battery cell arranged between the respective pair of separating elements, wherein the respective pair of adjacent separating elements exerts a clamping force on the battery cell arranged between the pair, wherein the clamping device has electromechanical actuators assigned to the respective pair, wherein the separating elements of the respective pair are coupled to one another via the electromechanical actuator assigned to the pair.wherein a distance between the pair of separating elements can be changed by controlling the actuator assigned to the pair, whereby a clamping force on the battery cell arranged between the pair of separating elements can be changed.,

[0012] By individually adjusting the spacing of the respective pair of separating elements, the clamping forces can be adapted to each individual cell. In particular, this can be achieved by changing the dimensions of the receiving spaces defined by the respective pair of separating elements in the stacking direction for each individual cell, in order to take into account the respective properties and, in particular, the thickness expansion of the battery cell arranged in the receiving space. For example, it is conceivable that one of the battery cells has a greater cell thickness than the other battery cells due to production fluctuations and / or expands more than the other battery cells during operation of the motor vehicle.In order to avoid excessive clamping force on this battery cell, the receiving space can be adjusted individually for each cell by controlling the electromechanical actuator assigned to the corresponding pair of separating elements, thus adjusting the clamping force exerted on this battery cell.

[0013] Because each separating element is assigned to two receiving spaces, any displacement of the separating element influences both receiving spaces. This type of design has the advantage of being particularly space-saving, as a corresponding free space does not have to be provided for each receiving space. Furthermore, the design according to the invention has the advantage that the forces exerted on the separating element by the battery cell arranged on one side of the separating element are absorbed by the battery cell arranged on the other side of the separating element. This allows the separating element to be designed to be weaker in terms of its mechanical stability than would be the case if the respective separating element were not supported on the other side by another battery cell.Accordingly, the separating elements can be designed with relatively thin walls, which in turn has a beneficial effect on the package density of the battery module.

[0014] It is considered particularly advantageous if the respective electromechanical actuator has a housing and a mechanical element that is adjustable in the stacking direction with respect to the housing, wherein the housing is connected to one separating element of the pair and the mechanical element is connected to the other separating element of the pair.

[0015] In a particularly preferred embodiment, it is provided that the housing has an electromagnet, wherein the control of the respective electromechanical actuator takes place by energizing the electromagnet, wherein the mechanical element can be displaced in the stacking direction with respect to the housing by energizing the electromagnet.

[0016] In a particularly preferred embodiment, the battery module has a control system for controlling the electromechanical actuators. The control system can also be configured to determine a clamping force acting on the individual battery cell and, by controlling the electromechanical actuator(s), to regulate the clamping force acting on the respective battery cell to a desired value.

[0017] In a particularly preferred embodiment, it is provided that the bracing device has a first fixed end plate and a second fixed end plate spaced from the first end plate in the stacking direction of the battery cells, wherein the stacked battery cells are arranged between the first end plate and the second end plate.

[0018] The two fixed end plates define a total space available to the multiple battery cells. In addition, the two end plates absorb the counterforces exerted by the clamped battery cell stack. Accordingly, these end plates must be sufficiently solid to absorb these forces. The end plates can, for example, be part of a battery module housing that encloses the battery cell all the way around. In contrast to the fixed end plates, the separating elements can be moved within the battery module housing using electromechanical actuators in order to regulate the clamping forces acting on the respective battery cell. Due to the fact that the separating elements are arranged between the battery cells, preferably held in a clamped manner between these battery cells, it is not necessary to guide the separating elements in the battery module housing with regard to their movement.This makes assembly easier.

[0019] It is considered particularly advantageous if the stacked battery cells have a first end-side battery cell, wherein a separating element of the plurality of separating elements and the first end plate delimit a first end-side receiving space for the first end-side battery cell, wherein the separating element and the first end plate are coupled to one another via a further electromechanical actuator, wherein a distance between the separating element and the first end-side end plate can be changed by controlling the further electromechanical actuator, whereby a clamping force on the first end-side battery cell can be changed.

[0020] In a particularly preferred embodiment, it is provided that the stacked battery cells have a second end-side battery cell, wherein a stop element which is displaceable in the stacking direction is arranged between the second end-side battery cell and the second end plate, wherein a separating element of the plurality of separating elements and the stop element delimit a second end-side receiving space for the second end-side battery cell, wherein the second end-side battery cell is supported on the stop element in the stacking direction, wherein the stop element and the second end plate are coupled to one another via a further electromechanical actuator, wherein a distance between the stop element and the second end plate can be changed by controlling the further electromechanical actuator.

[0021] It is quite conceivable that the stop element is designed to be more solid than the separating elements, since, in contrast to the separating elements, the stop element interacts with only one battery cell, namely the second end-side battery cell, whereby the forces exerted by this battery cell on the stop element are not counteracted by forces from an opposite battery cell that at least partially compensate for the forces.

[0022] In connection with a stop element, it is considered advantageous if the stop element and the separating element are coupled to one another via a further electromechanical actuator, wherein a distance between the separating element and the stop element can be changed by controlling the further electromechanical actuator, whereby a clamping force on the first end-side battery cell can be changed.

[0023] In an alternative design of the battery module, it is provided that the battery module has a clamping device, wherein the clamping device has a first clamping plate and a second clamping plate, wherein a plurality of battery cells arranged one behind the other along a stacking direction are arranged between the first clamping plate and the second clamping plate, wherein the clamping device has a clamping band, wherein the first clamping plate and the second clamping plate are coupled to one another via the clamping band, wherein a clamping force exerted by the clamping plates on the battery cells is dependent on an active length of the clamping band, wherein an electromechanical actuator is fastened to the first clamping plate, wherein the clamping band is coupled to the electromechanical actuator, wherein the active length of the clamping band can be changed by controlling the electromechanical actuator.

[0024] This embodiment also provides for the clamping forces to be variable by controlling an electromechanical actuator. In contrast to the inventive design with the separating elements, the alternative design with the clamping wall whose active length can be adjusted does not provide for individual cell-specific adjustment of the clamping forces. By changing the active length of the clamping band, the first clamping plate and the second clamping plate are clamped together more tightly or more loosely, thereby altering the clamping forces acting on the battery cells.

[0025] In an advantageous further development, it is provided that the tensioning strap is coupled to the electromechanical actuator via a pulley with at least one loose deflection pulley.

[0026] By providing a pulley system, the forces required by the electromechanical actuator for tensioning can be reduced. This allows the electromechanical actuator to be designed with a lower maximum force.

[0027] In an advantageous further development, it is provided that a plurality of tensioning straps are provided, wherein at least one electromechanical actuator is assigned to each of the tensioning straps.

[0028] By providing several tensioning straps, tilting moments and / or bending moments can be avoided.

[0029] In a particularly preferred embodiment, it is provided that a plurality of tensioning straps are provided, wherein the plurality of tensioning straps are connected to the same electromechanical actuator.

[0030] The multiple tensioning straps can, for example, be guided over a pulley and then connected to the common electromechanical actuator.

[0031] The following figures illustrate the invention in more detail using exemplary embodiments, without being limited to them. They show: Fig. 1 a first embodiment of a battery module according to the invention in an internal view in a schematic representation in a first state, Fig. 2 the battery module according to Fig. 1 in a second state, Fig. 3 a second embodiment of a battery module in a schematic representation in a perspective view, Fig. 4 a third embodiment of a battery module in a schematic representation in a perspective view.

[0032] The Fig. 1 and Fig. 2 show an embodiment of a battery module 1 of a high-voltage battery for a motor vehicle. The battery module 1 is shown only schematically. The battery module 1 comprises a plurality of battery cells 3', 3'', 3''' arranged one behind the other or side by side along a stacking direction, which in this case runs in the Y direction. In the present case, the battery module 1 comprises three battery cells 3', 3'', 3''', namely a first end-side battery cell 3', an internal battery cell 3'', and a second end-side battery cell 3'''. The battery module 1 has a battery module housing 6, wherein the battery module housing 6 has two fixed end plates 61, 62 spaced apart in the stacking direction Y. The battery cells 3', 3'', 3''' are arranged between these end plates 61, 62. The battery module housing 6 encloses an interior space in which the battery cells 3', 3'', 3''' are accommodated.Between adjacent battery cells 3', 3'', 3''', a separating element 2 is arranged, which in this case is plate-shaped. In this case, the battery module 1 accordingly comprises two separating elements 2. The two separating elements 2 form a pair of separating elements 2, which delimits a receiving space 4'' for the internal battery cell 3'' arranged between the pair of separating elements 2. The separating elements 2 exert a clamping force on the internal battery cell 3'' arranged between the pair. This clamping force is applied via the separating elements 2 on opposite sides of the internal battery cell 3''. The separating elements 2 form components of a clamping device, wherein the clamping device has electromechanical actuators 5'' assigned to the pair of separating elements 2.In the present exemplary embodiment, two electromechanical actuators 5'' are arranged between the separating elements 2, one of the actuators 5'' being arranged above the battery cell 3'' in the vertical direction Z and the other actuator 5'' being arranged below the battery cell 3'' in the vertical direction Z. The electromechanical actuators 5'' can each be controlled via a control device 8, wherein by controlling the electromechanical actuators 5'' of the actuators 5'' arranged between the separating elements 2, a distance a'' between the pair of separating elements 2 can be changed. By changing the distance a'', a clamping force exerted by the separating elements 2 on the inner battery cell 3'' arranged between the pair of separating elements 2 can be changed.

[0033] A separating element 2 of the plurality of separating elements 2 and the first end plate 61 define a first end-side receiving space 4' for the Fig. 1 right first end-side battery cell 3'. The separating element 2 and the first end plate 61 are in turn coupled to each other via two electromechanical actuators 5'. A distance a' between the separating element 2 and the first end plate 61 can be changed by controlling these actuators 5', whereby a clamping force on the first end-side battery cell 3' can be adjusted.

[0034] Furthermore, a stop element 7 is arranged in the interior of the battery module housing 6, wherein this stop element 7 is again plate-shaped, similar to the separating elements 2. The stop element 7 is located on a side facing the second housing wall 62 of the Fig. 1 left second end-side battery cell 3'''. Accordingly, a second end-side receiving space 4''' for this second end-side battery cell 3''' is delimited by the stop element 7 and the adjacent separating element 2. Between this stop element 7 and the separating element 2, two electromechanical actuators 5''' are arranged, which act in the same way as the actuators 5' arranged between the pair of separating elements 2.

[0035] By means of further electromechanical actuators 5'''' arranged between the stop element 7 and the second end plate 62, a distance between the stop element 7 and the second end plate 62 can be changed in order to thus change the entire internal space available for the plurality of battery cells 3', 3'', 3'''. Accordingly, by moving the stop element 7, a clamping force for all battery cells 3', 3'', 3''' can be changed, whereas by moving the separating elements 2 relative to one another, a clamping force applied by the separating elements 2 can be changed for each individual cell.

[0036] The respective electromechanical actuator 5', 5'', 5''', 5'''' comprises a housing 51 and a mechanical element 52 that is adjustable relative to the housing 51 in the stacking direction Y. In the actuators 5'' assigned to the receiving space 4'', the housing 51 is connected to one separating element 2 of the pair of separating elements 2, and the mechanical element 52 is connected to the other separating element 2 of the pair of separating elements 2. In the present embodiment, the mechanical element 52 of the respective electromechanical actuator 5' of the first end-side receiving space 4' is connected to the first end plate 61, and the housing 51 is connected to the adjacent separating element 2. In the second end-side receiving space 4''', the housing 51 of the respective electromechanical actuator 5''' is connected to the stop element 7, and the mechanical element 52 is connected to the separating element 2.In the electromechanical actuators 5'''' arranged between the stop element 7 and the second end plate 62, the housing 51 of the respective electromechanical actuator 5'''' is connected to the second end plate 61 and the mechanical element 52 is connected to the stop element 7.

[0037] In the Fig. 1, the separating elements 2 and the stop element 7 are in a state in which the receiving spaces 4', 4'', 4''' for the respective battery cell 3', 3'', 3''' have an identical dimension in the stacking direction Y and accordingly the distances a', a'' and a''' are identical. In the Fig. 2, however, the receiving space 4'' for the internal battery cell 3'' is, by appropriately controlling the actuators 5'' defining the dimensions of this receiving space 4'', compared to the state in the Fig. 1 in the stacking direction. For the two end-side battery cells 3', 3''', however, the electromechanical actuators 5', 5''' defining the end-side receiving spaces 4', 4''' are enlarged compared to the state in the Fig. 1 unchanged, so that the end-side receiving spaces 4', 4''' for the end-side battery cells 3', 3''' are in the Fig. 2 are identical to the state shown in the Fig. 1. To make this possible, the distance between the stop element 7 and the second end plate 62 is reduced by the same amount as the receiving space 4" for the internal battery cell 3" was increased by appropriately controlling the actuators 5"".

[0038] The Fig. 3 shows a second embodiment of the battery module 1. The battery module 1 according to the Fig. 3 has a clamping device for clamping the battery cells 3. The clamping device has a first clamping plate 9 and a second clamping plate, wherein a plurality of battery cells 3 arranged one behind the other along a stacking direction Y are arranged between the first clamping plate 9 and the second clamping plate. In the present case, there are again three battery cells 3. The clamping device has two clamping straps 10. The clamping straps 10 run parallel and are spaced from one another in a vertical direction Z. The first clamping plate 9 and the second clamping plate are coupled to one another via the clamping straps 10. A clamping force exerted by the clamping plates 9 on the battery cells 3 can be changed by changing the active length of the respective clamping strap 10. For this purpose, four electromechanical actuators 5 are attached to the first clamping plate 9.Two of the actuators 5 are assigned to the respective clamping band 10, with the actuators 5 each being connected to one of the opposite ends of the respective clamping band 10. By controlling the electromechanical actuators 5, an active length of the respective clamping band 10 can be changed in order to change the clamping force exerted by the clamping plates 9 on the battery cells 3 arranged between the clamping plates 9. The electromechanical actuators 5 are in turn controlled via a control device 8.

[0039] In the Fig. In the embodiment shown in Figure 3, the electromechanical actuators 5 act directly on the tensioning straps 10. In order to apply high tensioning forces, the electromechanical actuators 5 must therefore be designed with corresponding strength.

[0040] The embodiment in the Fig. 4 differs from the embodiment according to the Fig.3 essentially in that only a single electromechanical actuator 5 is attached to the first clamping plate 9 and operatively connected to the ends of the clamping straps 10, wherein the clamping straps 10 are operatively connected to the actuator 5 via a common deflection pulley 11, a further pulley 12, and a loose pulley 13. The further pulley 12 and the loose pulley 13 form a pulley kinematics, whereby the forces to be applied by the actuator 5 for the purpose of clamping are reduced compared to an embodiment without pulley kinematics. List of reference symbols 1 battery module 2 separating element 3 battery cells 3' first end-side battery cell 3'' internal battery cell 3''' second end-side battery cell 4 Recording room 4' first end recording room 4'' recording room 4''' second end-side recording room 5 Actuator 5' actuator 5'' actuator 5''' actuator 5'''' actuator 6 Battery module housing 7 Stop element 8 Control device 9 first clamping plate 10 tensioning strap 11 pulley 12 rolls 13 loose roll 51 housings 52 Mechanical element 61 first end plate 62 second end plate a' distance a'' distance a''' distance Y direction QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 103 305 A1

[0007] DE 10 2020 214 014 A1

[0008] US 2023 / 0066229 A1

[0008] US 2021 / 0226246 A1

[0008]

Claims

[1] Battery module (1) of a high-voltage battery, wherein the battery module (1) has a clamping device with a plurality of separating elements (2), wherein a plurality of battery cells (3', 3'', 3''') arranged one behind the other along a stacking direction (Y) are arranged in the clamping device, wherein a separating element (2) of the plurality of separating elements (2) is arranged between adjacent battery cells (3', 3'', 3''') in each case, such that the separating elements (2) each delimit in pairs a receiving space (4) for a battery cell (3'') arranged between the respective pair of separating elements (2), wherein the respective pair of adjacent separating elements (2) exerts a clamping force on the battery cell (3'') arranged between the pair, wherein the clamping device has electromechanical actuators (5'') assigned to the respective pair,wherein the separating elements (2) of the respective pair are coupled to one another via the electromechanical actuator (5'') assigned to the pair, wherein a distance (a'') between the pair of separating elements (2) can be changed by controlling the electromechanical actuator (5'') assigned to the pair, whereby a clamping force on the battery cell (3'') arranged between the pair of separating elements (2) can be changed. [2] Battery module (1) according to claim 1, wherein the respective electromechanical actuator (5'') comprises a housing (51) and a mechanical element (52) which is adjustable with respect to the housing (51) in the stacking direction (Y), wherein the housing (51) is connected to one separating element (2) of the pair and the mechanical element (52) is connected to the other separating element (2) of the pair. [3] Battery module (1) according to claim 1 or 2, wherein the housing (51) has an electromagnet, wherein the control of the respective electromechanical actuator (5'') is effected by energizing the electromagnet, wherein the mechanical element (52) is displaceable with respect to the housing (51) in the stacking direction (Y) by energizing the electromagnet. [4] Battery module (1) according to one of claims 1 to 3, wherein the clamping device has a first fixed end plate (61) and a second fixed end plate (62) spaced apart from the first end plate (61) in the stacking direction (Y) of the battery cells (3', 3'', 3'''), wherein the stacked battery cells (3', 3'', 3''') are arranged between the first end plate (61) and the second end plate (62). [5] Battery module (1) according to claim 4, wherein the stacked battery cells (3', 3'', 3''') have a first end-side battery cell (3'), wherein a separating element (2) of the plurality of separating elements (2) and the first end plate (61) delimit a first end-side receiving space (4') for the first end-side battery cell (3'), wherein the separating element (2) and the first end plate (61) are coupled to one another via a further electromechanical actuator (5'), wherein a distance (a') between the separating element (2) and the first end plate (61) can be changed by controlling the further electromechanical actuator (5'), whereby a clamping force on the first end-side battery cell (3') can be changed. [6] Battery module (1) according to claim 4 or 5, wherein the stacked battery cells (3', 3'', 3''') have a second end-side battery cell (3'''), wherein a stop element (7) displaceable in the stacking direction (Y) is arranged between the second end-side battery cell (3''') and the second end plate (62), wherein a separating element (2) of the plurality of separating elements (2) and the stop element (7) delimit a second end-side receiving space (4''') for the second end-side battery cell (3'''), wherein the second end-side battery cell (3''') is supported on the stop element (7) in the stacking direction (Y), wherein the stop element (7) and the second end plate (62) are coupled to one another via a further electromechanical actuator (5''''), wherein a distance between the stop element (7) and the second end plate (62) can be controlled by controlling the further electromechanical actuator Actuator (5'''') is variable. [7] Battery module (1) of a high-voltage battery, wherein the battery module (1) has a clamping device, wherein the clamping device has a first clamping plate (9) and a second clamping plate, wherein a plurality of battery cells (3) arranged one behind the other along a stacking direction (Y) are arranged between the first clamping plate (9) and the second clamping plate, wherein the clamping device has a clamping band (10), wherein the first clamping plate (9) and the second clamping plate are coupled to one another via the clamping band (10), wherein a clamping force exerted by the clamping plates (9) on the battery cells (3) is dependent on an active length of the clamping band (10), wherein an electromechanical actuator (5) is fastened to the first clamping plate (9), wherein the clamping band (10) is coupled to the electromechanical actuator (5), wherein the active length of the clamping band (10) can be changed by controlling the electromechanical actuator (5). [8] Battery module (1) according to claim 7, wherein the tensioning strap (10) is coupled to the electromechanical actuator (5) via a pulley with at least one loose deflection roller (13). [9] Battery module (1) according to claim 7 or 8, wherein a plurality of tensioning straps (10) are provided, wherein at least one electromechanical actuator (5) is assigned to each of the tensioning straps (10). [10] Battery module (1) according to claim 7 or 8, wherein a plurality of tensioning straps (10) are provided, wherein the plurality of tensioning straps (10) are connected to the same electromechanical actuator (5).

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