Traction battery for a motor vehicle and corresponding motor vehicle

Abstract

The invention relates to a traction battery (3) for a motor vehicle (1), comprising a battery housing (6) and a battery cell arrangement (11) arranged in the battery housing (6), which has several battery cells (12) that are in contact with a flat temperature control element (13) for heat transfer, wherein the temperature control element (13) has at least one bulge (18) on its side facing away from the battery cells (12) to form at least one fluid channel (16) in the temperature control element (13). It is provided that the battery cell arrangement (11) is arranged between two stiffening plates (20, 21) to increase stiffness, wherein one of the stiffening plates (20, 21) completely overlaps the temperature control element (13), partially abuts the temperature control element (13), and has a recess (2 20) that accommodates the bulge (18). The invention further relates to a motor vehicle (1) with a traction battery (3).

Description

[0001] The invention relates to a traction battery for a motor vehicle, comprising a battery housing and a battery cell arrangement located in the battery housing, which has several battery cells in contact with a flat temperature control element for heat transfer, wherein the temperature control element has at least one bulge on its side facing away from the battery cells to form at least one fluid channel in the temperature control element. The invention further relates to a motor vehicle with a traction battery.

[0002] For example, the prior art document DE 20 2020 006 035 U1 describes a battery module comprising: a cell unit containing a plurality of battery cells arranged on both surfaces of a unit plate; and a housing that accommodates the cell unit and is provided with a cooling device comprising at least one surface of the housing, wherein the unit plate comprises a plurality of receiving spaces, each formed by a plate section with a flat surface and a side section projecting upwards and downwards from both sides of the plate section, and the plurality of battery cells are received in each of the receiving spaces.

[0003] Furthermore, the publication EP 3 905 366 B1 describes a battery box comprising a lower box body. The lower box body is provided to comprise: a first plate comprising: a bottom wall; a perimeter wall connected to a perimeter of the bottom wall and extending upwards; wherein the bottom wall and the perimeter wall form an upwardly opening receiving space; a second plate attached to the bottom wall by a base and engaging with the bottom wall to form a flow channel, wherein the second plate is provided with: a second projection extending from a side facing a reinforcing beam to the first plate and extending along a transverse direction;and an opening extending through the second projection of the second plate along a vertical direction and along the transverse direction, the second projection of the second plate being sealed and connected to the bottom wall of the first plate; and the battery box further comprising: the reinforcing beam arranged below the second plate and extending along the transverse direction, the reinforcing beam being installed at a position of a corresponding opening and being rigidly connected to the first plate and / or the second plate.

[0004] Further traction batteries and housings for battery cells are known from publications WO 2024 / 115299 A1, EP 4 156 390 A1 and EP 2 086 035 B1.

[0005] The object of the invention is to propose a traction battery for a motor vehicle which has advantages over known traction batteries, in particular providing additional installation space in the battery housing for accommodating battery cells and also effectively stiffening the traction battery, in particular the battery cell arrangement.

[0006] This is achieved according to the invention with a traction battery for a motor vehicle with the features of claim 1. It is provided that the battery cell arrangement is arranged between two stiffening plates to increase stiffness, wherein one of the stiffening plates completely overlaps the temperature control element, partially abuts the temperature control element, and has a recess to accommodate the bulging.

[0007] Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are possible.

[0008] The traction battery is preferably an integral part of the motor vehicle; however, it can, of course, also be separate from it, particularly until the traction battery is mounted on or in the motor vehicle. The traction battery is designed and configured for the intermediate storage of electrical energy for the motor vehicle's drive system. The drive system serves to propel the motor vehicle, thus providing drive torque for propelling the motor vehicle. To provide the drive torque, the drive system has at least one drive unit, which is designed as an electric traction motor electrically connected to the traction battery.

[0009] The traction battery comprises a battery cell assembly, which in turn contains several battery cells. The battery cells are preferably prismatic or pouch cells. The battery cell assembly forms, for example, a component of a cell module, which in turn can be part of a battery module. The battery module preferably includes end plates and / or a clamping device in addition to the battery cell assembly. The end plates are, for example, part of a battery module housing and accommodate the battery cell assembly between them. The battery cell assembly is positioned between the end plates and clamped by means of the clamping device to form the battery module. In this respect, the end plates are arranged on opposite sides of the battery cell assembly. Preferably, the battery module is cuboid or at least approximately cuboid.

[0010] The battery cells of the battery cell assembly are preferably electrically interconnected. For this purpose, the battery cells are arranged, for example, such that the electrical connections of the battery cells are located on the same side and / or facing each other. The connections are preferably electrically connected to each other by means of one or more busbars, which are also preferably electrically connected to electrical connections of the battery module and / or the traction battery. In other words, the battery cells of the battery module are electrically connected to the terminals via the busbars.

[0011] The traction battery has a battery housing containing a battery module receptacle designed and configured to hold one or more battery modules. During the manufacturing process, the battery module is inserted into this receptacle. Preferably, the battery housing does not contain just a single battery module, but rather multiple battery modules. In such a configuration, the battery housing has a corresponding battery module receptacle designed and configured to hold multiple battery modules.

[0012] During operation of the traction battery, heat is generated in the battery cell assembly, which must be dissipated, or heat must be supplied to reach a specific temperature within the battery cell assembly. For this reason, the battery cells of the battery cell assembly are connected to a flat temperature control element via heat transfer. This element is integrated into the battery cell assembly and, for example, forms part of the battery module. The temperature control element is generally plate-shaped and can therefore also be referred to as a temperature control plate or – depending on its intended use – as a cooling plate and / or heating plate. Preferably, the temperature control element and the battery cell assembly form the battery module, which is then installed as such in the battery housing.During the assembly of the traction battery, the battery cell arrangement and the temperature control element are therefore installed together as a single unit in the battery housing.

[0013] The temperature control element contains at least one fluid channel through which a fluid, particularly a coolant, flows at least temporarily. Insofar as this description refers to the coolant, it is understood that this can serve both to cool and to heat the battery cell assembly; it can accordingly also be called a temperature control medium. The temperature control element thus forms a component of a temperature control device by means of which the battery module is at least temporarily temperature-controlled. With the aid of the temperature control device, heat is at least temporarily removed from the battery module and / or heat is at least temporarily supplied to the battery module using the temperature control device.

[0014] For example, to ensure reliable thermal connection between the battery cell assembly and the temperature control element, a thermal interface material is introduced. This thermal interface material is, for example, a thermal paste, specifically a viscous, thermally conductive material. The thermal paste can also be referred to as a "gap filler." Alternatively, a thermally conductive adhesive can be used as the thermal interface material.

[0015] For weight reasons, the temperature control element is designed to be as flat as possible, meaning it is made of the thinnest possible material. This necessitates that the temperature control element has a raised section on the side facing away from the battery cells to form the fluid channel. On the side facing the battery cells, the temperature control element is flat, preferably completely and continuously, to ensure that the element makes full contact with the battery cells and thus reliable heat transfer between the temperature control element and the battery cells.

[0016] For example, the temperature control element consists of two thin plates, preferably made of metal or plastic (i.e., metal or plastic sheets), which are placed on top of each other and bonded together. The two plates are joined by roll bonding, preferably by rolling. In the area where the fluid channel will later be located, no pressing force is applied to the plates during rolling, and / or a release agent is applied between the plates beforehand. This means that the plates are only mechanically bonded together by rolling or roll bonding away from the fluid channel. Subsequently, a pressurized fluid, such as compressed air, is introduced between the plates, causing the fluid channel to expand.

[0017] Such a temperature control element is characterized by its particularly low weight and is also inexpensive to manufacture. However, it has very low stiffness and therefore contributes little to the mechanical rigidity of the battery cell assembly. For this reason, it might be advisable to mount the battery cell assembly in a frame that defines the mechanical strength of the battery cell assembly or the battery module.

[0018] This frame, for example, surrounds the battery cell arrangement by means of frame members and additionally has longitudinal and / or transverse struts which extend through the battery cell arrangement in one or more directions and are attached to the frame members at their ends. Such a frame ensures excellent strength properties of the battery module, but significantly increases the weight. For this reason, according to the invention, a different approach is to be taken to ensure the strength of the battery module.

[0019] For this purpose, the battery cell assembly is arranged between two stiffening plates, which serve to increase the rigidity of the battery module. The stiffening plates are preferably made of solid material and have a higher stiffness than the temperature control element, in particular by a factor of at least 5, at least 10, or at least 25. In particular, the stiffening plates are designed such that they support the battery cell assembly on their own.

[0020] For example, the stiffening plates that support the battery cell assembly are fastened to one another, in particular by means of at least one fastening element, preferably a bolt or the like. If the assembly consisting of the battery cell assembly and stiffening plates is now attached via one of the stiffening plates, for example to a vehicle body, the battery cell assembly is reliably held in place simply by virtue of its position between the two stiffening plates. The stiffening plates are therefore specifically designed to bear the weight of the battery cell assembly.

[0021] The stiffening plates are preferably dimensioned such that they completely enclose the battery cell assembly, meaning they have at least the same dimensions as the battery cell assembly in two mutually perpendicular directions. Accordingly, one of the stiffening plates also completely overlaps the temperature control element, so that the temperature control element is subsequently held, and in particular clamped, between the battery cell assembly and the stiffening plate. The stiffening plate thus rests against the temperature control element and presses it towards the battery cell assembly. Therefore, the stiffening plates not only provide mechanical stiffening of the battery module, but also ensure that the temperature control element is reliably in contact with the battery cell assembly and thus reliably regulates the temperature of the battery cell assemblies by means of the temperature control element.

[0022] Since the temperature control element has a raised section to form the fluid channel, the stiffening plate must not contact the temperature control element within the fluid channel itself, but only away from it, in order to prevent compression and thus blockage of the fluid channel. For this reason, the stiffening plate has a recess on its side facing the temperature control element, which accommodates the raised section. Specifically, the recess is designed such that the stiffening plate only contacts the temperature control element away from the fluid channel and the raised section, thus pressing the element towards the battery cell assembly.

[0023] Where this description refers to the fluid channel or the at least one fluid channel, or the bulge or at least one bulge, the descriptions are equivalent. Explanations regarding the fluid channel are therefore applicable to the at least one fluid channel, and explanations regarding the bulge are applicable to the at least one bulge, and vice versa. Preferably, there is not just one fluid channel and, consequently, not just one bulge, but rather several fluid channels and, consequently, several bulges. In this case, the explanations regarding the fluid channel and the bulge are applicable to each of the several fluid channels and each of the several bulges. The recess in the stiffening plate is designed in this case to accommodate all the bulges. For this purpose, several recesses may be produced in the temperature control element, or the recess may consist of several partial recesses.

[0024] In any case, the stiffening plate rests only against the temperature control element away from the fluid channels or the raised sections. This design achieves high mechanical rigidity of the battery module while maintaining the simple and cost-effective manufacturing of the temperature control element. It should be noted that, with the traction battery in its intended configuration, the stiffening plates are located below and above the battery cell assembly, i.e., on opposite sides of the battery cell assembly with respect to the vehicle's vertical axis.

[0025] A further development of the invention provides that a first stiffening plate abuts a first housing wall of the battery housing, and a second stiffening plate is at least partially spaced away from a second housing wall of the battery housing and / or is supported on the second housing wall via at least one housing wall projection of the second housing wall. The battery cell assembly is arranged together with the temperature control element and the two stiffening plates in the battery housing. Here, the first stiffening plate abuts the first housing wall, whereas the second stiffening plate is spaced away from the second housing wall opposite the first housing wall. Preferably, in the intended arrangement of the traction battery, the first stiffening plate and the first housing wall are located above the battery cell assembly, and the second stiffening plate and the second housing wall are located below the battery cell assembly.

[0026] Preferably, the first housing wall rests against the vehicle body, so that the first stiffening plate and the body clamp the first housing wall between them. The spacing of the second stiffening plate from the second housing wall creates a cavity within the battery housing. This cavity serves primarily as underride protection for the traction battery, thus allowing a certain degree of deformation of the second housing wall in the direction of the battery cell arrangement without causing damage to the battery cell arrangement.

[0027] To ensure sufficiently high mechanical strength of the battery housing, the second housing wall preferably has a housing wall projection extending from the second housing wall and abutting the second stiffening plate. For example, the second housing wall is attached to the second housing plate via the housing wall projection. Preferably, several such housing wall projections are present, spaced apart from one another within the battery housing. This design of the traction battery also serves to achieve the advantages already mentioned.

[0028] A further development of the invention provides that the battery cells, on a side facing away from the temperature control element, bear against a further flat temperature control element in a heat-transferring manner. This further temperature control element has at least one further bulge to form at least one further fluid channel, wherein another of the stiffening plates bears against the further temperature control element in a partial area and has a further recess to accommodate the further bulge. The temperature control element and the further temperature control element accommodate the battery cell or the battery cell arrangement between them. The further temperature control element is preferably designed analogously to the temperature control element, so reference is made to the corresponding embodiments.

[0029] The temperature control elements, i.e., the temperature control element and the additional temperature control element, accommodate the battery cell between them, whereas the stiffening plates, i.e., the stiffening plate and the additional stiffening plate, accommodate both the battery cells and the temperature control element between them. The stiffening plates thus rest against the temperature control elements on their facing sides. A fluid channel is also formed in the additional temperature control element, creating a raised section, which is referred to here as the additional fluid channel and the additional raised section. Analogous to the explanations for the stiffening plate, the additional stiffening plate also has the recess, or the additional recess, in which the additional raised section is arranged. Reference is also made here to the explanations for the raised section and the recess, which are analogous to the additional raised section and the additional recess.The additional temperature control element enables particularly effective temperature control of the battery cells, namely from opposite sides.

[0030] A further development of the invention provides that a material reduction is produced in one of the stiffening plates on its side facing away from the battery cells to form a predetermined breaking point defining a degassing opening. The battery cells preferably each have a degassing valve which opens in the event of overpressure occurring in the battery cell, allowing the overpressure to be released towards the outside environment. To prevent the pressure in the battery housing from rising too high in this case and causing uncontrolled deformation of the battery housing, the stiffening plates and the battery housing are designed to allow a flow path from the battery cells to the outside environment if overpressure occurs.

[0031] For this purpose, the stiffening plate has a predetermined breaking point where, under pressure, the plate yields and releases the degassing opening. This breaking point is achieved by a material reduction, i.e., a local decrease in the wall thickness of the stiffening plate. The material reduction is located on the side of the stiffening plate facing away from the battery cells. It is particularly preferably situated at a point where the traction battery is positioned under the stiffening plate as intended. This design ensures a high level of safety for the traction battery.

[0032] A further development of the invention provides that, in addition to the battery cell arrangement, a further battery cell arrangement is arranged, and that the battery cells of the further battery cell arrangement are in contact with the temperature control element and / or the further temperature control element in a heat-transferring manner. The battery cells of the battery cell arrangement are preferably arranged side by side in a first direction. The further battery cell arrangement also has battery cells arranged side by side in the first direction. The battery cell arrangement and the further battery cell arrangement are arranged side by side in a second direction perpendicular to the first direction, so that ultimately the battery cells of the battery cell arrangement and the further battery cell arrangement are parallel to each other.

[0033] The battery cell assembly and the additional battery cell assembly are components of the same cell module and therefore both have heat transfer in contact with the temperature control element and / or the additional temperature control element. In principle, any number of such additional battery cell assemblies can be part of the traction battery; for example, there are at least five battery cell assemblies per cell module. Using a single temperature control element and / or a single additional temperature control element to regulate the temperature of both the battery cell assembly and the additional battery cell assembly allows for particularly efficient heat dissipation and / or supply.

[0034] A further development of the invention provides that the battery cell arrangement, the further battery cell arrangement, and the temperature control element form a cell module, and that a further cell module is arranged adjacent to the cell module. The cell module and the further cell module are arranged between the two stiffening plates, and one stiffening plate completely overlaps a temperature control element of the further cell module and partially abuts it. The aforementioned cell module comprises at least the battery cell arrangement, the further battery cell arrangement, and the temperature control element, which overlaps the two battery cell arrangements and regulates their temperature. The further temperature control element can, of course, also be part of the cell module.

[0035] The cell module and at least one other cell module, together with the stiffening plates, form the battery module. In addition to the battery module, the traction battery can have at least one further battery module, which is also arranged in the battery housing. In principle, any number of such battery modules can be present and accommodated by the battery housing. The traction battery, or battery module, has multiple cell modules and, accordingly, in addition to the cell module, has the further cell module, which is arranged adjacent to the cell module, particularly in the second direction already mentioned.

[0036] Naturally, the traction battery can have any number of cell modules, meaning that any number of additional cell modules can be present alongside the main cell module. To achieve a particularly effective improvement in the mechanical properties of the traction battery, both the main cell module and any additional cell modules are positioned between the two stiffening plates. Specifically, the two stiffening plates completely overlap both the main cell module and the additional cell module. This applies to all cell modules of the battery module or traction battery.

[0037] The stiffening plate completely overlaps and partially abuts both the temperature control element of the cell module and the temperature control element of the next cell module—more generally, the temperature control elements of all cell modules in the battery module. The recess(s) of the stiffening plate are arranged and designed to accommodate the curvature of the overlapping temperature control element(s). This preferably applies analogously to the other stiffening plate. This achieves the advantages already mentioned.

[0038] A further development of the invention provides that the cell module and subsequent cell modules are arranged directly adjacent to one another, in particular without a stiffening strut between them. The stiffening strut, for example in the form of a longitudinal strut or a transverse strut, has already been discussed. By using stiffening plates, the stiffening strut that would otherwise be present between the cell modules can be dispensed with. For example, it is provided that such a stiffening strut is only present between battery modules arranged adjacent to one another. Accordingly, the weight of the traction battery can be significantly reduced despite its excellent rigidity.

[0039] A further development of the invention provides that the stiffening plates are directly attached to one another, in particular by means of a fastening element arranged between the battery cells, for example, a bolt. The stiffening plates are thus not merely connected to one another via the battery cell arrangement, but are also directly attached to one another, thereby bypassing the battery cell arrangement. Preferably, the fastening element engages one of the stiffening plates on the battery cell arrangement and another of the stiffening plates on the battery cell arrangement, and is firmly connected to them, so that the stiffening plates are also rigidly held together by the fastening element. A bolt, preferably a threaded bolt, serves as the fastening element.The direct attachment of the stiffening plates to each other enables a particularly high stiffness of the resulting arrangement of stiffening plates and battery cell arrangement.

[0040] The invention further relates to a motor vehicle with a traction battery, in particular a traction battery as described in this description, wherein the traction battery comprises a battery housing and a battery cell arrangement located in the battery housing, which has several battery cells in contact with a flat temperature control element for heat transfer, wherein the temperature control element has at least one bulge on its side facing away from the battery cells to form at least one fluid channel in the temperature control element. It is provided that the battery cell arrangement is arranged between two stiffening plates to increase stiffness, wherein one of the stiffening plates completely overlaps the temperature control element, partially abuts the temperature control element, and has a recess to accommodate the bulge.

[0041] The advantages of such a design for the motor vehicle and the traction battery have already been mentioned. Both the motor vehicle and the traction battery can be further developed as described in this document, and reference is made to these details accordingly.

[0042] A further development of the invention provides that at least one of the stiffening plates is attached to the vehicle body by means of a fastening element, and the battery cell assembly is connected to the body exclusively via this one stiffening plate and the fastening element. Preferably, the stiffening plate is attached to the body, and the stiffening plates are additionally attached directly to one another. Ultimately, the battery cell assembly is arranged between the stiffening plates and connected to the body via them. No further mechanically load-bearing connection between the battery cell assembly and the body is provided. This reliably achieves the advantages described above, in particular the weight reduction.

[0043] The features and combinations of features described in the description, in particular those described in the following figure description and / or shown in the figures, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention, in particular the scope of the claims. Thus, embodiments that are not explicitly shown or explained in the description and / or the figures, but which emerge from or can be derived from the explained embodiments, particularly within the scope of the claims, are also to be considered as encompassed by the invention.

[0044] The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without limiting the invention. The only embodiment shown is... Fig. 1 A schematic sectional view of an area of ​​a motor vehicle which has a traction battery attached to the body of the motor vehicle.

[0045] The Fig.Figure 1 shows a schematic sectional view of a motor vehicle 1, of which a body 2 and a traction battery 3 are shown in particular. A crossmember 4 and a sill 5 supporting the crossmember 4 are shown of the body 2. The traction battery 3 is attached to the crossmember 4. The traction battery 1 has a battery housing 6, which consists of at least a first housing part 7 and a second housing part 8. The first housing part 7 serves as the base tray and the second housing part 8 as the housing cover. The two housing parts 7 and 8 are sealed against each other at a seam by means of a seal 9. Additionally, a reinforcement 10 in the form of a hollow profile is arranged on the battery housing 6 to improve crash resistance.

[0046] The battery housing 6 contains a battery cell arrangement 11, which, in the embodiment shown here, comprises several battery cells 12 arranged side by side in a first direction, some of which are characterized by way of example. The battery cell arrangement 11 is located between a temperature control element 13 and another temperature control element 14, which are in contact with the battery cells 2 on opposite sides and thus transfer heat. Preferably, the temperature control elements 13 and 14 are thermally connected to the battery cells 12 via a thermal conductor 15. The temperature control elements 13 and 14 each have one or more fluid channels 16 and 17, respectively, which are formed by means of a bulge 18 and 19 on a side facing away from the battery cells 12. The bulges 18 and 19 are only partially characterized by way of example.

[0047] To increase rigidity, the battery cell assembly 11 is arranged between two stiffening plates 20 and 21. Each of the stiffening plates 20 and 21, as well as the battery cell assembly 11, clamps one of the temperature control elements 13 and 14 between them. To ensure reliable temperature control of the battery cell assembly 11, the stiffening plates 20 and 21 have recesses 22 and 23, respectively (partially shown), which accommodate the protrusions 18 and 19, respectively. It can be seen that the stiffening plate 20 rests against a housing wall 24, which is part of the second housing part 8. The stiffening plate 21, on the other hand, is spaced apart from a housing wall 24 formed by the first housing part 7. In the illustrated embodiment, the stiffening plate 21 is supported on the housing wall by housing wall projections 26.

[0048] For example, the stiffening plates 20 and 21 are directly attached to one another, in particular by means of a fastening element 27, such as a bolt. The fastening element preferably also serves to attach the traction battery 3 to the body 2, in particular to the crossmember 4. For example, the fastening element 27 engages the stiffening plate 21 and presses it, and thus the battery cell arrangement 11, towards the stiffening plate 20, which in turn is pressed against the body 2. This ensures reliable attachment of the traction battery 3 to the body 2. Furthermore, extremely high rigidity of the traction battery 3 is guaranteed. A degassing opening 28 is also visible, which can be released by a predetermined breaking point formed by a material weakening in the stiffening plate 21. REFERENCE MARK LIST: 1 motor vehicle 2 Bodywork 3 traction batteries 4 crossbeams 5 sills 6 battery cases 7 1. Housing part 8 2. Housing part 9 Seal 10 Reinforcement 11 Battery cell arrangement 12 battery cells 13 Temperature control element 14 Temperature control element 15 Thermal conductors 16 Fluid channel 17 Fluid channel 18. Bulging 19. Bulging 20 stiffening plate 21 Stiffening plate 22 recess 23 recess 24 Housing wall 25 Housing wall 26 Housing wall projection 27 Fastening element 28 Degassing opening 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 20 2020 006 035 U1

[0002] EP 3 905 366 B1

[0003] WO 2024 / 115299 A1

[0004] EP 4 156 390 A1

[0004] EP 2 086 035 B1

[0004]

Claims

Traction battery (3) for a motor vehicle (1), comprising a battery housing (6) and a battery cell arrangement (11) arranged in the battery housing (6), which has several battery cells (12) that are in contact with a flat temperature control element (13) for heat transfer, wherein the temperature control element (13) has at least one bulge (18) on its side facing away from the battery cells (12) to form at least one fluid channel (16) in the temperature control element (13), characterized in that the battery cell arrangement (11) is arranged between two stiffening plates (20, 21) to increase stiffness, wherein one of the stiffening plates (20, 21) completely overlaps the temperature control element (13), partially abuts the temperature control element (13) and has a recess (2 20) that receives the bulge (18). Traction battery according to claim 1, characterized in that a first stiffening plate (20, 21) abuts a first housing wall (24) of the battery housing (6) and a second stiffening plate (20, 21) is at least partially spaced from a second housing wall (25) of the battery housing (6) and / or is supported on the second housing wall (5 and 20) via at least one housing wall projection (26) of the second housing wall (5 and 20). Traction battery according to one of the preceding claims, characterized in that the battery cells (12) are in contact with a further flat temperature control element (14) on a side facing away from the temperature control element (13) in a heat-transferring manner, the temperature control element having at least one further bulge (19) to form at least one further fluid channel, wherein one further stiffening plate (20, 21) is partially in contact with the further temperature control element (14) and has a further recess (23) to accommodate the further bulge (19). Traction battery according to one of the preceding claims, characterized in that in one of the stiffening plates (20, 21) on its side facing away from the battery cells (12) a material reduction is produced to form a predetermined breaking point defining a degassing opening. Traction battery according to one of the preceding claims, characterized in that a further battery cell arrangement is arranged next to the battery cell arrangement (11) and battery cells of the further battery cell arrangements are in contact with the temperature control element (13) and / or the further temperature control element (14) in a heat-transferring manner. Traction battery according to one of the preceding claims, characterized in that the battery cell arrangement (11), the further battery cell arrangement and the temperature control element (13) form a cell module and a further cell module is arranged adjacent to the cell module, wherein the cell module and the further cell module are arranged between the two stiffening plates (20, 21) and one stiffening plate (20) completely overlaps a temperature control element of the further cell module and partially abuts it. Traction battery according to one of the preceding claims, characterized in that the cell module and the further cell module are arranged directly adjacent to each other. Traction battery according to one of the preceding claims, characterized in that the stiffening plates (20, 21) are directly attached to one another. Motor vehicle (1) with a traction battery (3), in particular a traction battery (3) according to one or more of the preceding claims, wherein the traction battery (3) has a battery housing (6) and a battery cell arrangement (11) arranged in the battery housing (6), which has several battery cells (12) that are in contact with a planar temperature control element (13) for heat transfer, wherein the temperature control element (13) has at least one bulge (18) on its side facing away from the battery cells (12) to form at least one fluid channel in the temperature control element (13), characterized in that the battery cell arrangement (11) is arranged between two stiffening plates (20, 21) to increase stiffness, wherein one of the stiffening plates (20, 21) completely overlaps the temperature control element (13), partially abuts the temperature control element (13) and has a recess to receive the bulge (18). (22) shows. Motor vehicle according to claim 9, characterized in that at least one of the stiffening plates (20, 21) is attached to a body (2) of the motor vehicle (1) by means of a fastening element (27) and the battery cell arrangement (11) is connected to the body (2) exclusively via the one stiffening plate (20, 21) and the fastening element (27).

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