Battery system for an electrically powered motor vehicle

Abstract

The invention relates to a battery assembly (2) for an electrically powered motor vehicle. This assembly comprises a cell stack (4) with prismatic battery cells (6) arranged one behind the other in a stacking direction (S), wherein the cell poles (12) of each battery cell (6) are arranged on opposite longitudinal sides (16) of the cell stack (4), and a clamping device (34) for the cell stack (4), comprising two pressure plates (38) between which the cell stack (4) is arranged, and clamping bands (32) for clamping the pressure plates (38) against the cell stack (4), wherein the clamping bands (32) are arranged on the longitudinal sides (16) of the cell stack (4) that have the cell poles (12). The invention further relates to a motor vehicle with such a battery assembly (2) and to an assembly (18) for such a battery assembly (2).

Description

[0001] The invention relates to a battery system for an electrically powered motor vehicle, wherein the battery system comprises a cell stack with prismatic battery cells arranged one behind the other and a clamping device for the cell stack. The invention further relates to an electrically powered motor vehicle with such a battery system.

[0002] An electrically powered vehicle typically has a traction battery (high-voltage battery, HV battery) that supplies energy to an electric motor to propel the vehicle. The term "electrically powered vehicle" refers in particular to an electric vehicle that stores the energy required for propulsion solely in the traction battery (BEV, battery electric vehicle), an electric vehicle with a range extender (REEV, range extended electric vehicle), a hybrid vehicle (HEV, hybrid electric vehicle), a plug-in hybrid vehicle (PHEV, plug-in hybrid electric vehicle), and / or a fuel cell vehicle (FCEV, fuel cell electric vehicle), which temporarily stores the electrical energy generated by a fuel cell in the traction battery.

[0003] Such a traction battery, particularly one designed as a lithium-ion battery, comprises a number of interconnected battery cells. The battery cells are expediently arranged one behind the other to form a cell stack.

[0004] The battery cells, especially those designed as prismatic battery cells, are expediently subjected to pressure from the outside of the cell so that the battery cells are operated in an optimal pressure range.

[0005] In the so-called modular construction method, the battery cells or cell stack are inserted into a frame, which is then welded together. Alternatively, in the so-called stack construction method, the battery cells or cell stack are placed between two pressure plates and clamped against each other. The two pressure plates are held together by one or more tension bands.

[0006] From DE 10 2018 124 365 A1, a battery module for supplying energy to electrical consumers is known. This module comprises a plurality of interconnected battery cells, a plurality of connecting elements for interconnecting the battery cells and / or the battery module, wherein the interconnected battery cells have electrically conductive, potential-free cell housings, wherein the cell housings are electrically connected to each other and combined to form a cell housing assembly, and wherein the cell housing assembly is electrically connected to the terminal of a battery cell arranged within the battery module.

[0007] The cell terminals of the battery cells are typically arranged on a common top surface of the cell stack and interconnected there. This requires a comparatively large vertical space, i.e., above the top surface of the battery cells, which is a disadvantage.

[0008] The invention is based on the objective of facilitating the assembly of the battery unit and / or reducing the installation space required in the vertical direction.

[0009] This problem is solved according to the invention by a battery device having the features of claim 1. Furthermore, this problem is solved according to the invention by an assembly having the features of claim 9 and by a motor vehicle having the features of claim 10. Advantageous embodiments and further developments are the subject of the dependent claims. The descriptions relating to the battery device apply mutatis mutandis to the assembly and to the motor vehicle, and vice versa.

[0010] The battery system is specifically designed and configured for an electrically powered motor vehicle, and is particularly suitable for its traction battery.

[0011] The battery system comprises a cell stack consisting preferably of lithium-ion battery cells, arranged one behind the other in a longitudinal stacking direction. The battery cells are prismatic cells, meaning they are cuboid in shape and housed in a casing, preferably made of sheet metal. The two cell terminals of each battery cell are located on opposite sides of the casing, particularly on the shorter, narrower sides. Preferably, the cell terminals are positioned centrally on each side of the casing. Thus, the two cell terminals of each battery cell are not located on a common side (face), but rather on parallel, i.e., opposite, sides of the casing.

[0012] The battery cells are arranged in the cell stack such that the two cell poles of each battery cell are located on opposite, and therefore parallel, longitudinal sides of the cell stack. In other words, each battery cell is arranged in the cell stack such that one of its cell poles is located on one of the longitudinal sides of the cell stack and the other cell pole is located on the other of the two longitudinal sides of the cell stack.

[0013] For example, the cell stack comprises between 10 and 100, in particular between 20 and 50 battery cells.

[0014] The term "transverse direction" here and in the following refers to a direction perpendicular to the stacking direction and oriented from one of the long sides of the cell stack to the opposite long side. Thus, the transverse direction of the cell stack is parallel to a battery cell's longitudinal direction, oriented from the side with one cell pole to the side with the other cell pole.

[0015] Accordingly, “arranged to the side of the cell stack” or “arranged on the long side of the cell stack” means an arrangement in which the corresponding component is arranged next to the cell stack with respect to the transverse direction; in other words, this component and the cell stack are arranged one behind the other in or against the transverse direction.

[0016] The vertical direction is understood to be the direction perpendicular to the transverse direction and perpendicular to the stacking direction. Similarly, the top of the cell stack is understood to be the side of the cell stack that is oriented vertically and perpendicular to the vertical direction, and the bottom is understood to be the side of the cell stack that is oriented vertically and perpendicular to the vertical direction. Advantageously, the cell stack comprises such a number of battery cells that the top and bottom sides form the largest surfaces (base sides) of the suitably cuboid-shaped cell stack.

[0017] The battery assembly further includes a clamping device for the cell stack. The clamping device has two pressure plates between which the cell stack is arranged. The pressure plates are thus located at the end faces of the cell stack, with others positioned at the ends of the cell stack relative to the stacking direction. The clamping device also includes clamping straps for clamping the pressure plates against the cell stack. Advantageously, at least one clamping strap is provided for each of the longitudinal sides, which is joined to both pressure plates, for example, welded.

[0018] The tension bands are arranged on the longitudinal sides of the cell stack that contain the cell poles. In particular, the tension bands are arranged only on the longitudinal sides of the cell stack. Thus, one tension band is arranged on one of the two longitudinal sides and another on the other. The respective tension band is therefore located laterally to the cell stack and, particularly preferably, not on the top or bottom of the cell stack. Advantageously, the tension band(s) are arranged vertically above or below the cell poles on the respective longitudinal side. The respective tension band extends along the respective longitudinal side in the stacking direction from one of the pressure plates to the other. During the assembly of the battery assembly, each tension band is joined to the pressure plates, in particular by welding.

[0019] Particularly advantageous is the arrangement of the cell poles on the longitudinal sides of the cell stack and the arrangement of the tension bands on the longitudinal sides, resulting in a battery system that requires a comparatively small installation space in the vertical direction.

[0020] In contrast to battery modules or battery stacks, where all cell poles are located on the top, it is also possible to utilize both the top and bottom surfaces of the cell stack for heat dissipation. This results in a comparatively high cooling capacity.

[0021] According to a preferred embodiment of the battery assembly, a first cooling device, for example a cooling plate, is arranged on the upper side and, in particular, glued to it. Alternatively or preferably additionally, a second cooling device, for example a cooling plate, is arranged on the underside and, in particular, glued to it. Advantageously, a thermally conductive adhesive is used for this purpose.

[0022] By bonding the cooling unit(s) directly to the cell stack in this way, a comparatively rigid battery unit and traction battery are provided. Consequently, an additional stiffening element for the battery unit or traction battery, particularly in the form of a longitudinal or transverse beam, can be (and expediently is) omitted. This results in less installation space being required for the battery unit or traction battery and / or its energy density being advantageously increased.

[0023] According to a suitable embodiment, one cell terminal, i.e., the positive terminal or the negative terminal, of each of two battery cells, in particular the cell terminals of two adjacent battery cells, are electrically connected to each other by means of an associated contact element (contact, HV contact, HV connector, cell connector). The contact element is, for example, designed as a busbar or as a conductor plate. The respective contact element is particularly preferably arranged on the corresponding longitudinal side of the cell stack. Thus, the respective contact element is preferably arranged only laterally to the side of the cell stack. Preferably, the contact elements do not project beyond the cell stack in and / or against the vertical direction. Due to such an arrangement of the contact elements, the installation space required for the battery assembly in the vertical direction is advantageously comparatively small.For the connection of the other battery cells, additional contact elements are provided in a similar manner. In summary, the battery cells are conveniently electrically connected to each other via the contact elements.

[0024] The battery cells are suitably connected in series. The battery cells are advantageously arranged longitudinally such that the positive and negative terminals alternate along the longitudinal sides. Preferably, the positive and negative terminals of directly adjacent battery cells are connected by means of their respective contact elements.

[0025] During the assembly of the battery unit, each of the contact elements is welded to the respective cell poles.

[0026] According to an advantageous embodiment, the battery assembly comprises a support frame to which at least one of the tensioning bands and the contact element, or at least one of the contact elements, is attached. The respective tensioning band and the respective contact element are thus connected to the support frame. In other words, the respective tensioning band and the respective contact element are pre-assembled on the support frame. Therefore, during the assembly of the battery assembly, the respective contact element and the respective tensioning band can be mounted on the cell stack with relatively little effort by means of this assembly. Advantageously, a support frame is provided for each of the longitudinal sides of the cell stack, to which at least one of the tensioning bands and at least one of the contact elements are attached in a similar manner.

[0027] For example, the respective contact element is held on the carrier frame by means of a snap-fit ​​or clip connection. Preferably, the carrier frame has one or more recesses in which the sections of the respective contact element intended for contact with the cell poles are inserted.

[0028] For example, the support frame has loop-like openings through which the respective tensioning strap passes. These openings are advantageously continuous in the longitudinal direction, so that the tensioning strap can be moved in or against the longitudinal direction for installation and / or is held in place with respect to the transverse and vertical directions.

[0029] Preferably, the support frame is made of an electrically non-conductive material, for example, a plastic.

[0030] The support frame is particularly preferably arranged and / or attached to the corresponding longitudinal side.

[0031] During assembly, the battery cells are suitably positioned along one long side of the cell stack and clamped against each other using the clamping band and pressure plates. The contact elements are then welded to the respective cell terminals, preferably after clamping.

[0032] For example, the support frame is a single, monolithic piece. Preferably, the support frame comprises several, expediently identical, support frame units (segments) arranged side by side in the longitudinal direction, i.e., in the stacking direction of the cell stack, and joined together. In this way, the length of the support frame can be adapted to the extent of the cell stack in the stacking direction by selecting the appropriate number of support frame units. For example, the support frame units are joined together by means of a snap-fit ​​connection.

[0033] Depending on a suitable design of the battery assembly, it includes a measuring lead. For example, the measuring lead is designed as, or comprises, a flexible printed circuit board. The measuring lead is attached to the support frame and, additionally or alternatively, to at least one of the tension bands. For example, the tension band is attached to the support frame using a clip connection or by hot-stitching. Additionally or alternatively, the measuring lead is, for example, glued to the tension band. In this way, the measuring lead is integrated into the assembly. Thus, the measuring lead is pre-assembled on the support frame.

[0034] Preferably, the measuring line extends in the stacking direction. Alternatively, or preferably additionally, the measuring line is arranged laterally to the side of the cell stack. Advantageously, the measuring line does not project above or below the cell stack in the vertical direction. With such an arrangement laterally to the cell stack, a space-saving design of the battery assembly in the vertical direction is achieved.

[0035] Advantageously, a measuring tap is provided on the contact element or on each of the contact elements. Preferably, the measuring tap is arranged on the side of the respective contact element facing away from the cell stack. The measuring line is connected to the measuring tap(s) for signal and / or data transmission. The measuring taps and the measuring line serve in particular to detect a cell voltage and / or a voltage between two cell poles. Advantageously, the measuring line is connected to a suitable evaluation unit.

[0036] According to a preferred embodiment of the battery assembly, a temperature sensor is arranged on the side of the support frame facing the cell stack. This sensor is expediently connected to the measuring line for signal and / or data transmission. Preferably, the temperature sensor is not positioned above or below the cell terminal in the transverse direction. In particular, the temperature sensor is positioned at a distance from the cell terminals of the battery cells along their respective longitudinal sides. Thus, the temperature sensor is located next to the cell terminals in the vertical direction. For example, the temperature sensor is located on the respective longitudinal side in the region of its upper or lower end in the vertical direction. Therefore, the temperature sensor is positioned near the cooling device (if present).Coldspot measurement), so that the temperature measurement of the respective battery cell is less affected by the current flow through the cell terminal and the associated heat generation. Alternatively, the temperature sensor is located in the area of ​​the cell terminals (hotspot measurement). For example, both coldspot and hotspot measurements are provided.

[0037] For example, the temperature sensor is glued, clipped, or screwed to the support frame. The support frame may also have a recess or a depression on the side facing the cell stack for the temperature sensor, in which the temperature sensor is received.

[0038] According to an advantageous embodiment, the support frame has a cover for the respective tension band and for the contact element, and preferably, if present, for the measuring cable. In the final assembly state, the cover thus covers the tension band, the contact element, and / or the measuring cable, thereby providing touch protection and / or protection for these components. For this purpose, the cover is positioned externally in the assembly state; in other words, the respective tension band, the contact element, and, if applicable, the measuring cable are arranged transversely between the cover and the cell stack.

[0039] Another aspect of the invention relates to an assembly for the battery unit, also referred to as a contacting unit. According to the embodiments of the battery unit described above, the assembly comprises at least one tension band and at least one contact element. This tension band and the contact element are held on the support frame to form the assembly, particularly as shown in connection with the battery unit. Preferably, the assembly includes a measuring lead that is connected to the support frame and / or to the tension band.

[0040] In summary, the assembly forms a sub-assembly whose components are pre-assembled and, in particular, joined together. The pre-assembled sub-assembly can then be attached to the cell stack and joined to it relatively easily.

[0041] Another aspect of the invention relates to an electrically powered motor vehicle which has a battery assembly configured in one of the variants described above, and / or which has an assembly configured in one of the variants described above. In particular, a traction battery (HV battery) of the motor vehicle, which provides electrical energy for powering the motor vehicle, comprises at least one such battery assembly, for example two or more than two such battery assemblies, and / or at least one such assembly. Alternatively, the battery assembly forms the traction battery.

[0042] It is advantageous for the battery installation in the motor vehicle to be arranged in such a way that the upward direction of the battery installation is the same as the upward direction of the vehicle.

[0043] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. The drawing shows: Fig. 1 schematically in an exploded view a battery device comprising a cell stack with prismatic battery cells and an assembly with a tension band, contact elements and a measuring lead, Fig. 2. Schematic overview and partial view of the assembly, and Fig. 3 schematically shows a cross-section of the battery assembly, wherein a cooling device is arranged on the top and bottom of the cell stack.

[0044] Corresponding parts and sizes are always provided with the same reference symbols in all figures.

[0045] In the Fig. Figure 1 shows an exploded view of a battery assembly 2 in perspective. This assembly comprises a cell stack 4, the battery cells 6 of which are arranged one behind the other in a stacking direction S, in particular stacked on top of each other in the stacking direction S. Optionally, a compression pad 8 and / or a thermally insulating pad 10 are inserted between adjacent battery cells 6 of the cell stack 4 to prevent thermal propagation.

[0046] The battery cells 6 of the cell stack 4 are designed as prismatic battery cells with a cuboid housing. In each of the battery cells 6, both cell poles 12, i.e., the positive pole and the negative pole, are arranged on opposite, and thus parallel, sides of the housing, namely on its narrow sides 14. The cell poles are located centrally on this housing side 14. Accordingly, in the cell stack 4, the cell poles 12 of the battery cells 6 are arranged on opposite long sides 16 of the cell stack 4.

[0047] The normals of the casing sides 14 of the battery cells 6, and thus the normals of the longitudinal sides 16 of the cell stack 4, are oriented parallel to a direction designated as the (stack) transverse direction Q. This transverse direction Q is therefore perpendicular to the stack direction S. The vertical direction H is the direction perpendicular to both the stack direction S and the transverse direction Q.

[0048] Furthermore, the battery assembly 2 comprises, for each of its longitudinal sides 16, an assembly 18, also referred to as a contacting unit or contacting device. In other words, a (first) assembly 18 is provided for the first longitudinal side 16 and a further assembly 18 (second assembly) is provided for the other longitudinal side 16. The first assembly 18 is arranged on one of the longitudinal sides 16 and the second assembly 18 is arranged on the second longitudinal side 16 of the cell stack 4.

[0049] Each assembly 18 comprises a support frame 20, preferably electrically insulating. As shown in particular in the Fig. As can be seen in Figure 2, the support frame 20 is designed in multiple parts. The support frame 20 comprises several, expediently identical support frame units 20a (segments 20a). The support frame units 20a are arranged side by side in the stacking direction S and are joined together here by way of an example using a snap-fit ​​connection 22. For this purpose, in the assembled state, snap hooks 22a of one of the support frame units 20a engage behind an associated snap projection 22b (snap lug) of the adjacent support frame unit 20a in the stacking direction S.

[0050] Furthermore, each assembly has 18 contact elements 24, by means of which the cell terminals 12 of adjacent battery cells 6 of the cell stack 4 are electrically connected to one another. For example, the battery cells 6 are electrically connected in series. For this purpose, the battery cells 6 are arranged such that the positive and negative terminals of the battery cells 6 alternate on the respective longitudinal side 16 in the stacking direction S. In this way, the positive terminal of one of the battery cells 6 is electrically connected to the negative terminal of the battery cell 6 adjacent to it by means of the respective contact element 24.

[0051] Each of the contact elements 24 is formed in a sheet-like manner. It has two flat joining sections 24a for contacting the cell poles. A channel-like, i.e., rib-like, recess is arranged between the two joining sections 24a. In the area of ​​this recess, the respective contact element 24 has a U-shaped cross-section. In summary, each contact element 24 has two joining sections 24a that span a common plane. The two joining sections 24a are connected to a retaining section 24b that forms the recess and has a U-shaped cross-section, with the two joining sections 24a being integrally formed at the free ends of the U-shaped legs of the retaining section 24b.

[0052] For each of the joining sections 24a, a recess 26 extending transversely in the direction Q is provided in the support frame 20. The joining sections 24a are received in these recesses 26. A locking element 28 engages behind the respective joining section 24a on its side facing away from the cell stack 4, i.e., on the side that faces away from the cell stack 4 in the assembled state of the battery assembly 2. In this way, the contact elements are held against falling out, particularly in a direction away from the cell stack 4. Furthermore, the support frame 20 includes a web 30 extending between the recesses 26, onto which the contact elements 24 are mounted. The web 30 is received in the area encompassed by the retaining section 24b, i.e., by the recess. The contact elements 24 are arranged such that the recess is open towards the cell stack.Thus, the contact elements 24 are prevented from falling out before being joined to the cell poles, particularly in the direction towards the cell stack 4. In summary, the contact elements 24 are held on one side by the locking elements 28 and on the other side by the web 30 received in the recess on the support frame 20, i.e., joined to it.

[0053] Due to the arrangement of the contact elements 24 in the area of ​​the respective cell poles 12, these are arranged on the corresponding longitudinal side 16 of the cell stack 4. In a space-saving manner, they do not project beyond the cell stack 4 with respect to the vertical direction H.

[0054] Furthermore, each assembly 18 comprises at least one tension band 32 for a clamping device 34 of the battery assembly 2. According to the embodiment shown here, each assembly 18 has two tension bands 32. The tension bands 32 extend in the stacking direction S and project through, in particular loop-shaped, openings 36 of the support frame 20 in the stacking direction S. In other words, each of the tension bands 32 is held on the support frame 20 by being guided through and received in the openings 36. The respective tension band 32 is thus displaceable for assembly in or against the stacking direction S and is held in the respective opening 36 with respect to the transverse direction Q and the vertical direction H.

[0055] The battery assembly 2 comprises two pressure plates 38, with the cell stack 4 arranged between the two pressure plates 38. In other words, the cell stack 4 is flanked on both sides (with respect to the stacking direction S) by the two pressure plates 38 at its stack ends. The clamping bands 32 are each joined to the two pressure plates 38, in particular by welding. According to the embodiment shown here, two clamping bands 32 are arranged on each of the longitudinal sides 16 of the cell stack, with one of these two clamping bands 32 being arranged above and the other below the cell poles 12 with respect to the vertical direction H.

[0056] The tension bands 32, together with the pressure plates 38, form the clamping device 34 of the battery assembly 2. The clamping device 34 serves to clamp the battery cells 6 against each other in the stacking direction S, thus pressing them against each other. This advantageously results in a comparatively uniform pressure distribution on the individual battery cells 6.

[0057] Furthermore, each assembly 18 includes a measuring line 40, which is designed here as a flexible printed circuit board. The measuring line 40 extends laterally to the cell stack in the stacking direction S.

[0058] The measuring cable 40 is attached to the support frame 20, specifically to a cover 20c of the support frame 20 (see also below). According to the embodiment shown here, the measuring cable 40 is connected to the cover 20c by means of a clip connection 42.

[0059] Each contact element 24 is provided with a measuring tap 44, the measuring tap 44 being located on the side of the respective contact element 24 facing away from the cell stack 4. The measuring line 40 is connected to the measuring tap(s) 44 for signal and / or data transmission, so that a cell voltage and / or a voltage between two cell poles 12 can be detected. A section 40a extending towards the respective measuring tap 44 covers one of the tension bands 32. In the area where it overlaps in the transverse direction, this section 40a is joined to the tension band 32. In particular, this section 40a is glued to the tension band 32 in this area. Optionally, an electrical or electronic component, in particular an SMD component, is arranged in this section 40a of the measuring line 40 (not shown in detail).Preferably, a fuse, in particular an SMD fuse, is arranged in this section 40a to protect the measuring lead against a short circuit and / or overcurrent (and consequently also against thermal damage). Advantageously, this section 40a is comparatively rigid due to its connection with the tension band 32.

[0060] The measuring cable 40 has a connection 46 designed as a plug and / or as a device receptacle, by means of which the measuring cable 40 can be connected to an evaluation unit (not shown). In the final assembly state of the battery assembly 2, the connection 46 is located on the outside of one of the pressure plates 38.

[0061] A temperature sensor 48 is connected to the measuring line 40 for signal and / or data transmission. To measure the temperature of one of the battery cells 6 of the cell stack 4, the temperature sensor 48 is arranged on the side of the support frame 20 facing the cell stack 4. Fig. 2 the temperature sensor is therefore covered by the support frame 20, which is why the temperature sensor 48 and the section 40b of the measuring line 40 leading to it are shown with dashed lines.

[0062] As especially in the Fig. As can be seen in Figure 2, the temperature sensor is not obscured by the contact element 24 with respect to the transverse direction Q. Thus, the temperature sensor 48 is arranged at a distance from the cell terminals 12 of the battery cells 6 on their respective longitudinal sides.

[0063] The temperature sensor 48 is joined to the support frame 20 in a manner not shown in detail, for example by being glued to it. The support frame 20 has a recess on its side facing the cell stack 4, which serves as a receptacle 50 for the temperature sensor 48.

[0064] For the assembly of the battery unit 2, the assembly 18, i.e., the support frame with the contact elements 24 attached to it, the tension bands 32 attached to it, and the measuring line 40 attached to them, is positioned on the respective longitudinal side 16 of the cell stack 4. The battery cells 6 are clamped against each other, and the tension bands 32 are joined to the pressure plates 38. In addition, the contact elements 24 are welded to the cell terminals 12 in the area of ​​their joining sections 24a.

[0065] The cover 20c of the support frame 20 is rotatably held relative to the (support) section 20b of the support frame 20 on which the contact elements 24 and the tension bands 32 are attached, by means of a hinge 52.

[0066] In the Fig. 1 and Fig. Figure 2 shows the support frame 20 in an arrangement where the cover 20c is folded away from the support section 20b. For example, in this state the contact elements 24 can be joined to the cell contacts.

[0067] In the final assembly state of the battery assembly, the cover 20c is rotated relative to the support section 20b such that the cover conceals the support section 20b, the contact elements 24, the tension bands 32 and the measuring line 40 with respect to the transverse direction Q, see also Fig. 3. Here, the measuring line is bent in the section 40a leading towards the respective measuring tap 44.

[0068] In the Fig. Figure 3 shows the battery assembly 2 schematically in a cross-section through one of its battery cells 6. The respective assembly 18 is shown in the Fig. 3 only schematically indicated.

[0069] A first cooling device 56 is arranged on the upper surface 54 of the cell stack 4, i.e., on its upper side in the vertical direction H, in other words, on its upper side oriented perpendicular to the vertical direction H. Advantageously, this is designed as a cooling plate. For example, this first cooling device 56 is glued to the cell stack 4, preferably using a thermally conductive adhesive.

[0070] Similarly, a second cooling device 60 is arranged on the underside 58 of the cell stack 4, i.e., on its lower side in the vertical direction H, in other words, on its lower side oriented perpendicular to the vertical direction H. Advantageously, this is designed as a cooling plate. For example, the second cooling device 60 is glued to the cell stack 4, preferably using a thermally conductive adhesive.

[0071] Due to the arrangement of the cell poles 12 and the respective assembly 18 on the opposite longitudinal sides 16 of the cell stack 4, it is particularly advantageous to use the comparatively largest side surfaces, i.e. the top 54 and the bottom 58, of the cell stack 4 for cooling the cell stack.

[0072] In a manner not shown in detail, an electrically powered motor vehicle has one or more than one battery unit 2 according to the Fig.1 to 3. The battery unit 2 is designed and configured to provide high voltage, i.e., a voltage greater than 60V, for a high-voltage electrical system of the motor vehicle. In particular, the battery unit 2 provides electrical energy for the traction drive of the motor vehicle.

[0073] The invention is not limited to the embodiments described above. Rather, other variants of the invention can also be derived by a person skilled in the art within the scope of the claims, without departing from the subject matter of the invention. In particular, all individual features described in connection with the embodiments and / or in the claims can also be combined with one another in other ways without departing from the subject matter of the invention. Reference symbol list 2 Battery setup 4 cell stacks 6 battery cells 8 compression pads 10 thermally insulating pads 12 cell poles 14 Narrow side 16 Long side 18 Assembly / Contacting unit 20 support frames 20a Carrier frame unit / segment 20b Carrier section 20c cover 22 rest connection 22a Locking hook 22b Resting projection / resting nose 24 contact elements 24a Joining section 24b Stop section 26 recess 28 locking elements for a contact element 30 Bridge 32 tension band 34 Clamping device 36 Implementation 38 Printing plate 40 measuring leads 40a,40b section of the measuring line 42 clip connections 44 Measuring tap 46 connection 48 Temperature sensor 50 recordings for the temperature sensor 52 hinge 54 Top 56 first cooling device 58 Underside 60 second cooling unit H Upward direction Q transverse direction S Stacking direction / longitudinal direction QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 10 2018 124 365 A1

[0006]

Claims

[1] Battery device (2) for an electrically driven motor vehicle, comprising - a cell stack (4) with prismatic battery cells (6) arranged one behind the other in a stacking direction (S), wherein cell poles (12) of each battery cell (6) are arranged on opposite longitudinal sides (16) of the cell stack (4), and - a clamping device (34) for the cell stack (4), with two pressure plates (38) between which the cell stack (4) is arranged, and with clamping bands (32) for clamping the pressure plates (38) against the cell stack (4), - wherein the tensioning straps (32) are arranged on the longitudinal sides (16) of the cell stack (4) having the cell poles (12). [2] Battery device (2) according to claim 1, characterized bya contact element (24) for electrically connecting cell poles of two of the battery cells (6), and / or wherein the contact element (24) is arranged, in particular only, on one of the longitudinal sides (16) of the cell stack (4). [3] Battery device (2) according to claim 2, characterized by a support frame (20) on which at least one of the tensioning straps (32) and the contact element (24) are held, and / or wherein the support frame (20) is arranged on one of the longitudinal sides (16). [4] Battery device (2) according to one of claims 1 to 3, characterized by a measuring line (40) which is fastened to the support frame and / or to at least one of the tensioning straps (32). [5] Battery device (2) according to claim 3 or 4, characterized by that the support frame (20) has a plurality of, in particular identically designed, support frame units (20a) which are arranged next to one another in the stacking direction (S) and joined to one another. [6] Battery device (2) according to one of claims 3 to 5, characterized by that a temperature sensor (48) is arranged on the side of the support frame (20) facing the cell stack (4), and / or wherein the temperature sensor (48) is arranged next to the cell poles of the battery cells (6). [7] Battery device (2) according to one of claims 3 to 6, characterized by that the support frame (20) has a cover (20c) for the respective clamping element and the contact element (24). [8] Battery device (2) according to one of claims 1 to 7, characterized by - a first cooling device (56) which is arranged on an upper side (54) of the cell stack (4), in particular glued thereto, and / or by - a second cooling device (60) which is arranged on an underside (58) of the cell stack (4), in particular glued thereto. [9] Assembly (18), in particular for a battery device (2) according to one of claims 3 to 7, comprising - a tensioning band (32) for a tensioning device (34) for tensioning battery cells (6) of a cell stack (4), - a contact element (24) for electrically connecting cell poles of two of the battery cells (6), - wherein the clamping band (32) and the contact element (24) are held on the support frame (20). [10] Electrically driven motor vehicle with a battery device (2) according to one of claims 1 to 8 and / or with an assembly (18) according to claim 9.

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