Storage housing for an electrical energy storage system of a motor vehicle and arrangement

Abstract

The invention relates to a storage housing (2) for an electrical energy storage device (3) of a motor vehicle (5) with at least one mounting area (6) by which the storage housing (2) is to be held in an underbody area (4) of the motor vehicle (5), and with at least one outer wall (7) which is arranged on a bottom surface (9) of the storage housing (2) pointing downwards in the vehicle vertical direction (8), wherein the outer wall (7) extends at least on its outer surface (11) in at least two longitudinal regions (13, 14) which are at least indirectly adjoining each other in the vehicle vertical direction (8).

Description

[0001] The invention relates to a storage housing for an electrical energy storage device of a motor vehicle according to the preamble of claim 1. Furthermore, the invention relates to an arrangement of a storage housing for an electrical energy storage device in an underbody area of ​​a motor vehicle according to the preamble of claim 10.

[0002] DE 10 2016 212 273 A1 discloses an electrical energy storage device for a motor vehicle, with a storage housing in which several long battery modules are housed, each comprising several battery cells, wherein several crossbars are provided in the storage housing, each arranged between two adjacent long battery modules, wherein the long battery modules each have a module housing surrounding the battery cells.

[0003] The object of the invention is to create a storage housing for an electrical energy storage device of a motor vehicle and an arrangement of a storage housing for an electrical energy storage device in an underbody area of ​​a motor vehicle, so that the aerodynamic behavior of the motor vehicle can be particularly improved.

[0004] This problem is solved according to the invention by a storage housing for an electrical energy storage device of a motor vehicle with the features of claim 1 and by an arrangement of a storage housing for an electrical energy storage device in an underbody area of ​​a motor vehicle with the features of claim 10. Advantageous embodiments of the invention are the subject of the dependent claims and the description.

[0005] A first aspect of the invention relates to a storage housing for an electrical energy storage device of a motor vehicle, particularly an electrically powered one. The motor vehicle is, for example, a passenger car. Preferably, the motor vehicle, particularly in its fully manufactured state, comprises the storage housing and, in particular, the electrical energy storage device. Preferably, the electrical energy storage device, particularly in its fully manufactured state, comprises the storage housing.

[0006] The fact that the motor vehicle is electrically powered can be understood, in particular, to mean that the motor vehicle has at least one electric motor by means of which the motor vehicle can be powered, especially electrically, for example, purely electrically. In other words, the motor vehicle is designed as a battery-electric vehicle or as a hybrid vehicle.

[0007] An electrical energy storage device can be understood to be, in particular, a battery or an accumulator. For example, an electric machine can be supplied with electrical energy, especially energy stored or chemically bound in the electrical energy storage device, to power a motor vehicle. In other words, the electrical energy storage device is designed as an electrical traction storage device, specifically as a traction battery.

[0008] In order to achieve a particularly high electrical power output for electrical, and especially purely electric, propulsion of the motor vehicle, the electrical energy storage device can have an electrical voltage, in particular an electrical operating or nominal voltage, which is preferably greater than 50 volts, particularly above 60 volts, and preferably several hundred volts. Accordingly, the electrical energy storage device is, for example, designed as a high-voltage component, in particular as a high-voltage storage device.

[0009] Preferably, the storage housing, in particular the electrical energy storage device, has at least one receiving space in which at least one storage element, in particular an electrical one, can be arranged or is arranged. This means that the at least one storage element can be received or is received in the receiving space, that is, within the storage housing. The storage element is, for example, designed as a storage cell. For example, the receiving space is at least partially, in particular predominantly or completely, preferably directly, bounded by at least one housing wall of the storage housing. In other words, the receiving space is at least partially formed by the housing wall. This means that the receiving space is at least partially, in particular predominantly or completely, covered by the housing wall. Thus, the housing wall, for example, at least partially surrounds the receiving space.

[0010] The storage housing, in particular the housing wall, has at least one mounting area by which the storage housing, in particular the electrical energy storage device, is to be held or secured in an underbody area, in particular on the underbody, of the motor vehicle. In other words, the storage housing, in particular the electrical energy storage device, can be attached or is secured in the underbody area, in particular on the underbody, via the mounting area. The underbody area can be understood to be, in particular, the underfloor area of ​​the motor vehicle, which can also simply be referred to as the underfloor. Therefore, the electrical energy storage device can be understood to be, in particular, an electrical underfloor storage device, in particular an underfloor battery.

[0011] For example, the electrical energy storage device, in particular the storage housing, is to be held or supported on a floor element via the mounting area, particularly at least indirectly or directly. Preferably, the storage housing, in particular the electrical energy storage device, is arranged at least partially, in particular predominantly or completely, under the floor element in the vertical direction of the vehicle. The floor element is, for example, part of the vehicle body. For example, the floor element is designed as the main floor, in particular of the body. The body is preferably designed as a self-supporting body. Preferably, the body defines an interior space of the vehicle at least partially, in particular predominantly or completely. For example, the floor element defines the interior space, at least partially downwards in the vertical direction of the vehicle.The interior, which can be referred to in particular as the vehicle interior, can especially be understood to mean a passenger compartment or a passenger cell.

[0012] The storage housing, in particular the housing wall, has at least one outer wall. The outer wall, in particular an outer surface of the outer wall, is arranged on a bottom surface of the storage housing that points downwards in the vehicle's vertical direction, particularly when the storage housing or the electrical energy storage device is installed in the motor vehicle. In other words, the storage housing, in particular the housing element, has at least one outer wall, in particular an outer surface, that points downwards in the vehicle's vertical direction, particularly when the storage housing or the electrical energy storage device is installed in the motor vehicle.

[0013] The term "outer wall" can be understood to refer in particular to the outer surface of the storage housing, especially the housing element, that faces downwards in the upward direction of the vehicle. Thus, the underside of the storage housing is a side of the storage housing, especially the housing element, facing away from the interior. This means that the outer wall, especially the outer surface, is preferably facing away from the interior.

[0014] The storage housing, in particular the housing element, is, for example, at least partially, and especially predominantly or entirely, made of metal, which means that the storage housing can be described, for example, as a metal housing. Alternatively, the storage housing, in particular the housing element, is made, for example, of another material, in particular plastic.

[0015] Preferably, the outer wall, and in particular the outer surface, is designed to allow airflow around the vehicle, especially the storage housing or the electrical energy storage device, during travel. This means that the air can flow along the outer wall, and in particular the outer surface, i.e., it flows along the outer wall or surface while the vehicle is in motion. Thus, the outer surface is designed, for example, as an air guide surface. The term "air" can refer in particular to the airflow generated by the vehicle.

[0016] In order to significantly improve the aerodynamic behavior of the motor vehicle, and in particular to minimize its air resistance, the invention provides that the outer wall extends at least on its outer surface into at least two longitudinal sections that are at least indirectly, and in particular directly, adjoining each other in the longitudinal direction of the vehicle, particularly when the storage housing or the electrical energy storage device is installed in the vehicle. This means that the outer wall, and in particular the outer surface, has at least two longitudinal sections that are at least indirectly, and in particular directly, adjoining each other in the longitudinal direction of the vehicle, and which extend to different lengths in the vertical direction of the vehicle, particularly at least on the outer surface.Thus, the outer wall, and in particular its outer surface, extends further downwards in the first of the longitudinal sections in the vehicle's vertical direction than in the second, and / or the outer wall, and in particular its outer surface, extends further downwards in the second longitudinal section in the vehicle's vertical direction than in the first. In other words, the distance between the outer wall, and in particular its outer surface, and a surface, especially in the vehicle's vertical direction, varies across the longitudinal sections. This means that the distance, which can be described as ground clearance, is not constant in the longitudinal direction of the vehicle, but varies. Specifically, the storage housing, viewed from below in the vehicle's vertical direction, i.e., on the underside or outer wall, is not flat, but curved, inclined, or stepped.The surface is, for example, a roadway.

[0017] The invention is based in particular on the following findings and considerations: Designing battery-electric vehicles can be particularly challenging due to the preferred placement of the electrical energy storage system in the underfloor. A conventional electrical energy storage system, which typically comprises a conventional storage housing with a flat bottom, i.e., a flat outer wall, cannot allow for an optimized height design because the electrical energy storage system must be positioned above an underfloor clearance line, for example, as specified in the requirements document. In particular, this makes it impossible to achieve particularly low-profile vehicles with longer or extra-long wheelbases, for example, in medium or large vehicle classes (MKL or GKL), due to the necessary ramp angle.A minimum clearance under the vehicle, particularly for municipal vehicles, can be 212 mm, for example, for vehicle-specific dimensions. The lower edge of the electrical energy storage system, especially the storage housing, relative to the vehicle's height, can be 207 mm, for example. Ramp angles and, if necessary, the integration of required protective components and measures on the underside of the storage housing, especially the energy storage system, can be taken into account according to the underfloor specifications. Furthermore, depending on the specific vehicle, components and fairings, such as aerodynamically effective parts, can be integrated, taking into account the respective vehicle-specific ground clearance, as specified in the underfloor specifications.Aerodynamic underbody panels or component designs, which utilize derivative-specific ground clearance from areas of a front axle and a rear axle of the vehicle, are drawn under the electrical energy storage system in relation to the vehicle's vertical direction, can therefore, for example, locally extend downwards by up to 17 mm in the vehicle's vertical direction and increase the vehicle's cross-sectional area by only about 0.02 m. 2 cause, for example, an increase in a, in particular as c x or c w The specified drag coefficient can be 0.02 (2 pt), but with favorable design, an improvement in the drag coefficient of 0.06 to 0.1 (6-10 pt) can be achieved. Because of the achievable aerodynamic improvement (c x× A) By 4 to 8 Pt, such a derivative-specific design of an underbody according to aerodynamic specifications, utilizing the respective derivative-specific ground clearance, can generally be useful.

[0018] In particular, the invention is based on the understanding that the mechanical impact on the underbody from an obstacle, for example when driving down a curb and / or driving up a bollard, can vary along different lengths of the underbody. Thus, the mechanical impact can differ, in particular, along the lengths of the storage housing or the outer wall. Mechanical impact can be understood, in particular, as the application of force. Therefore, in lengths where the mechanical load is lower than in other lengths, the wall thickness of the outer wall can be reduced, and / or, in particular, the deformation zones of the storage housing, referred to as deformation paths, can be made thinner or smaller.This means that the outer wall, and especially the outer surface, of the storage housing can deviate from a flat shape. This allows for an increase in the distance to the ground in those lengths where the mechanical impact from the obstacle is low or particularly low, thus increasing ground clearance, especially locally. This has a positive effect on the aerodynamic behavior of the vehicle, particularly in the underbody area. Specifically, it allows for a locally increased flow cross-section limited by the outer wall and the ground. In particular, this can minimize the vehicle's air resistance.Overall, it is evident that the storage housing or the electrical energy storage device according to the invention can be designed with a correspondingly adapted base contour in the form of the outer wall, wherein the base contour is preferably optimized with regard to underride protection requirements. Thus, an electrical energy storage device, in particular a high-voltage storage device, with optimized underride protection can be created.

[0019] In a further embodiment, it is provided that the first longitudinal region of the outer wall, in particular the outer surface, connects, especially in the installation position of the storage housing or the electrical energy storage device in the motor vehicle, in the longitudinal direction of the motor vehicle having two axles, towards one of the vehicle axles, which is located closer to the first longitudinal region, particularly in the longitudinal direction, and in particular at least indirectly or directly. This means that the first longitudinal region is located in the longitudinal direction of the vehicle between one of the vehicle axles, for example, the first of the vehicle axles, and the second longitudinal region, whereby the first longitudinal region is located closer to one vehicle axle than to the other vehicle axle, for example, the second vehicle axle.One of the vehicle axles, for example the first axle, is preferably designed as a front axle, and the other axle, for example the second axle, is preferably designed as a rear axle. Alternatively, the second axle is designed as a front axle, for example, and the first axle as a rear axle. Preferably, the outer wall, in particular the outer surface, extends further downwards in the vertical direction of the vehicle than in the second longitudinal region, at least on the outer side of the outer wall, especially in the installation position of the storage housings or the electrical energy storage device in the motor vehicle. In other words, the distance between the outer wall, in particular the outer surface, and the ground is less in the first longitudinal region than in the second longitudinal region.This means that the ground clearance is lower in the first length range than in the second length range. The distance, or ground clearance, can therefore decrease towards the respective vehicle axle and increase away from the respective vehicle axle.

[0020] This embodiment is based in particular on the understanding that in longitudinal regions of the underbody or outer wall away from the vehicle axles, for example, midway between the vehicle axles, the mechanical impact from the obstacle, such as when approaching a bollard, is lower than in the outer regions of the storage housing relative to the vehicle's longitudinal direction, especially the outer wall. As a result of the lower mechanical stress, the distance between the outer wall, especially the outer surface, and the ground can be increased in regions away from the vehicle axles, for example, midway between the vehicle axles in the longitudinal direction, especially in the second longitudinal region, compared to the outer regions, especially compared to the first longitudinal region, which has a positive effect on the aerodynamic behavior of the vehicle.

[0021] In a further embodiment, it is provided that the highest extent of the outer wall, particularly the outer surface, which is related to the vehicle's vertical direction, is located at least substantially centrally between the front and rear axles of the vehicle, particularly when the storage housing or electrical energy storage device is installed in the vehicle. In other words, the distance between the highest extent of the outer wall and the front axle, and the distance between the highest extent of the outer wall and the rear axle, are at least substantially equal in length.This means that the distance between the outer wall, especially the outer surface, and the ground—that is, the ground clearance—is at its maximum in the longitudinal direction of the vehicle, centered between the front and rear axles. This means it is particularly greater than at the outer edges of the outer wall or surface relative to the vehicle's longitudinal direction. Therefore, ground clearance can be significantly increased in the center between the front and rear axles because, for example, when driving over bollards, less mechanical stress is exerted on the storage housing, especially the outer wall, in this area than at the edges. Consequently, the vehicle's aerodynamics can be significantly improved. The maximum extent of the outer wall can be understood to be, in particular, the maximum extent of the outer wall on the outside, which can be referred to as the underside.The highest extent is, for example, the point on the outer wall, in particular the outer surface, where the distance between the outer wall, in particular the outer surface, and the ground is greatest, i.e., at its maximum.

[0022] In a further embodiment, it is provided that the outer wall, in particular the outer surface, has a continuous, and in particular a steady, profile at least in the longitudinal regions, especially in the installation position of the storage housing or the electrical energy storage device in the motor vehicle, and between the longitudinal regions, at least in the longitudinal direction of the vehicle. This means that the outer wall, and in particular the outer surface, extends continuously, and in particular steadily, in the longitudinal direction of the vehicle, at least in the first longitudinal region, in a transition region between the first and the second longitudinal region, and in the second longitudinal region. In other words, the outer wall is free of discontinuities, breaks, or the like, at least in the longitudinal regions and between the longitudinal regions, at least in the longitudinal direction of the vehicle.This allows for the creation of a particularly well-aerodynamically efficient surface on the outer wall, which can significantly improve the aerodynamic behavior, especially the air resistance of the vehicle.

[0023] In a further embodiment, it is provided that the outer wall, in particular the outer surface, is curved at least in certain areas, especially in the longitudinal sections and / or between the longitudinal sections. In other words, the outer wall, in particular the outer surface, has at least a curved shape, for example, at least in the longitudinal sections and / or in the longitudinal direction of the vehicle between the longitudinal sections. For example, the longitudinal sections follow each other in a curved, and in particular continuously, manner in the longitudinal direction of the vehicle. The continuous course can therefore be curved. This allows the shape of the outer wall to be particularly well adapted to the mechanical stress on the storage housing when it is struck by the obstacle.This allows the maximum possible ground clearance to be created in different length ranges with regard to mechanical load, thereby significantly improving aerodynamic behavior.

[0024] It is particularly preferred that a vertex of the arc-shaped form, especially in the installation position of the storage housing or the electrical energy storage device in the motor vehicle, is located at least substantially centrally between the front and rear axles of the motor vehicle in the longitudinal direction. This means that the distance extending in the longitudinal direction of the vehicle between the vertex and the front axle is at least substantially the same as the distance extending in the longitudinal direction of the vehicle between the vertex and the rear axle. In other words, the highest extent of the outer wall, especially the outer surface, relative to the vehicle's vertical direction, is formed as the vertex of the arc-shaped form.In other words, the distance between the outer wall, especially the outer surface, and the ground is at its maximum at the apex of the arc shape, meaning it is greater than in the sections of the outer wall extending from the apex along the vehicle's longitudinal axis, such as the edges. This means that the ground clearance is at its maximum at the apex of the arc shape. As a result, the ground clearance can be particularly well adapted to the mechanical stress on the storage housing when it encounters an obstacle. This significantly improves the vehicle's aerodynamic performance.

[0025] In a further embodiment, it is provided that a deformation zone is attached, at least indirectly, and in particular directly, to the respective longitudinal sections of the outer wall, particularly in the installation position of the storage housing or the electrical energy storage device in the motor vehicle, extending upwards in the vehicle's vertical direction. This means that a first deformation zone is attached to the first longitudinal section extending upwards in the vehicle's vertical direction, and a second deformation zone, distinct from the first, is attached to the second longitudinal section extending upwards in the vehicle's vertical direction. In other words, a respective deformation zone of the storage housing, particularly of the electrical energy storage device, is arranged above the respective longitudinal section of the outer wall in the vehicle's vertical direction.Preferably, the deformation zones are designed to have different heights, particularly when the storage housing or electrical energy storage device is installed in the vehicle. This means that the first deformation zone has a first height extending upwards, and the second deformation zone has a second height extending upwards, with the first and second heights being different from each other. Thus, for example, one of the deformation zones extends further downwards in the vehicle's vertical direction than the other. This allows the different heights of the deformation zones to compensate for the varying lengths of the outer wall in the vehicle's vertical direction, i.e., the different distances to the ground.This is particularly advantageous because in those length ranges where the ground clearance is maximum or greater, the mechanical stress when the storage housing is struck by the obstacle is lower or minimal, thus allowing for a smaller deformation zone, i.e., a deformation zone with a lower height, in these length ranges. The deformation zones are preferably formed separately from the outer wall.

[0026] The respective deformation zone can be understood to be, in particular, a deformation element, which is designed, for example, as an energy absorption element. Preferably, the respective deformation zone is deformable, particularly under energy dissipation, upon mechanical stress, for example, in the event of an accident or upon impact with an obstacle, in particular to dissipate collision energy. The collision energy can be referred to, in particular, as accident energy.

[0027] It is particularly preferred that the height of the deformation zone extending vertically from the first longitudinal section, especially of the first deformation zone, is greater than the height of the deformation zone extending vertically from the second longitudinal section, especially of the second deformation zone. This means that the deformation zone in the longitudinal section where the distance between the outer wall, especially the outer surface, and the ground is greater than in the other longitudinal section has a lower height extending vertically from the vehicle than in the other deformation zone. This simultaneously ensures sufficient mechanical strength of the storage housing and significantly improves the aerodynamics of the vehicle.

[0028] In a further embodiment, it is provided that the maximum extent of the outer wall, in particular the outer surface, relative to the vehicle's vertical direction, and a minimum extent of the outer wall, in particular the outer surface, relative to the vehicle's vertical direction, are spaced apart from each other by at least 5 millimeters (for example, at least 6, 8, or 10 millimeters) and / or a maximum of 20 millimeters (for example, a maximum of 15 millimeters). In other words, the outer wall, in particular the outer surface, extends downwards by at least 5 millimeters (for example, 6, 8, or 10 millimeters) and / or a maximum of 20 millimeters (for example, 10 millimeters) in the area of ​​its minimum extent than in the area of ​​its maximum extent.Thus, the first length range extends, for example, at least 5 millimeters, in particular at least 6, 8, or 10 millimeters, and / or a maximum of 20 millimeters, in particular 15 millimeters, further downwards in the vehicle's vertical direction than the second length range. This allows for an ideal compromise between the mechanical strength of the storage housing and the improvement of the vehicle's aerodynamics. The lowest extent of the outer wall can be understood, in particular, as the lowest extent on the outer surface of the outer wall in the vehicle's vertical direction. The lowest extent is, for example, the point on the outer wall, in particular the outer surface, where the distance between the outer wall, in particular the outer surface, and the substrate is smallest, i.e., minimal.

[0029] A second aspect of the invention relates to an arrangement of a storage housing, particularly according to the first aspect of the invention, for an electrical energy storage device, or of an electrical energy storage device in an underbody area of ​​a motor vehicle. Furthermore, an arrangement of an electrical energy storage device with a storage housing, particularly according to the first aspect of the invention, in an underbody area of ​​a motor vehicle is disclosed. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0030] The storage housing has at least one mounting area by which it is held in the underbody area. Furthermore, the storage housing has at least one outer wall which is arranged on a bottom surface of the storage housing that points downwards in the upward direction of the vehicle.

[0031] In order to particularly improve the aerodynamic behavior of the motor vehicle, and in particular to keep the air resistance of the motor vehicle particularly low, it is provided according to the invention that the outer wall extends at least on its outer side in at least two longitudinal regions which are at least indirectly, and in particular directly, adjoining each other in the longitudinal direction of the vehicle to different extents in the vertical direction of the vehicle.

[0032] Another aspect relates to an electrical energy storage device comprising a storage housing according to the first aspect of the invention. Furthermore, a motor vehicle with such an electrical energy storage device is disclosed. Advantages and advantageous embodiments of the first and second aspects of the invention are to be regarded as advantages and advantageous embodiments of the further aspect, and vice versa.

[0033] Further features of the invention will become apparent from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown in the figures alone, are not only usable in the combinations specified, but also in other combinations or on their own.

[0034] The invention will now be explained in more detail using a preferred embodiment and with reference to the drawings. They show: Fig. 1 a schematic lateral partial sectional view of an arrangement according to the invention; and Fig. 2. A schematic side view of a motor vehicle to illustrate a ramp angle; and Fig. 3. A schematic bottom view of a storage housing to illustrate mechanical stress during a bollard drive; and Fig. 4 a schematic partial sectional view of a storage housing according to the invention in a further embodiment.

[0035] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.

[0036] Fig. Figure 1 shows a schematic partial sectional view of an arrangement 1 of a storage housing 2 for an electrical energy storage device 3 in an underbody area 4 of a motor vehicle 5. Thus, in Fig. Figure 1 shows a side view, in particular a partial sectional view, of the motor vehicle 5.

[0037] The storage housing 2 has at least one mounting area 6 by which the storage housing 2 is held in the underbody area 4 of the motor vehicle 5. Furthermore, the storage housing 2 has at least one outer wall 7, which is arranged on a lower surface 9 of the storage housing 2, in particular of the electrical energy storage device 3, which points downwards in the vehicle's vertical direction 8. In the exemplary embodiment, the outer wall 7 has an outer surface 10 that points downwards in the vehicle's vertical direction 8.

[0038] The outer wall 7 is, for example, at least partially, and in particular predominantly or entirely, made of plastic. The outer wall 7 can be designed as an underride guard, for example made of plastic, and in particular as an integrated high-voltage storage device. Alternatively, the outer wall 7 can also be made of another material.

[0039] In order to particularly improve the aerodynamic behavior of the motor vehicle 5, it is provided that the outer wall 7, in particular the outer surface 10, extends to different lengths in the vehicle's vertical direction 8 in at least two longitudinal regions 13, 14 that are at least indirectly, in particular directly, adjoining each other in the longitudinal direction 12 of the vehicle. This means that a first distance 17 is provided between the outer wall 7, in particular the outer surface 10, and a substrate 16 in a first longitudinal region 13, and a second distance 18, different from the first distance 17, is provided between the outer wall 7, in particular the outer surface 10, and the substrate 16 in the second longitudinal region 14.In the exemplary embodiment, the outer wall 7, in particular the outer surface 10, has a third length range 16, which is distinct from the length ranges 13 and 14. A third gap 19 is preferably provided between the outer wall 7, in particular the outer surface 10, and the substrate 16 in the third length range 15, which is, for example, different from the second gap 18. The respective gaps 17, 18, 19 preferably extend in the upward direction of the vehicle 8. The respective gaps 17, 18, 19 can be understood, in particular, as the respective ground clearance of the motor vehicle 5. Thus, the electrical energy storage device 3 is not, in particular, an electrical energy storage device 3 with a flat base.

[0040] In the exemplary embodiment, the second length section 14 is arranged in the longitudinal direction 12 of the vehicle between the first and the third length sections 13, 15. The first length section 13 adjoins the second length section 14 forward in the longitudinal direction 12, in particular at least indirectly or directly. Preferably, the third length section 15 adjoins the second length section 14 rearward in the longitudinal direction 12, at least indirectly, in particular directly. Furthermore, in the Fig. As can be seen in the embodiment shown in Figure 1, the motor vehicle 5 has two vehicle axles 20, 21, spaced apart from each other, particularly in the longitudinal direction 12 of the vehicle, wherein a first of the vehicle axles 20 is designed as the front axle 20a and the second vehicle axle 21 is designed as the rear axle 21a. Thus, the first longitudinal section 13 adjoins the second longitudinal section 14 in the direction of the vehicle axle 20, in particular the front axle 20a, which is located closer to the first longitudinal section 13 in the longitudinal direction 12. In the embodiment, the third longitudinal section 15 adjoins the second longitudinal section 14 in the direction of the vehicle axle 20, 21 which is located closer to the third longitudinal section 15 in the longitudinal direction 12.Thus, in the exemplary embodiment, the third length section 15 adjoins the second length section 14 in the direction of the rear axle 21a. The outer wall 7, in particular the outer surface 10, extends further downwards in the first length section 13 in the vehicle's vertical direction 8 than in the second length section 14, at least on the outer side 11. In particular, the outer wall 7, for example the outer surface 10, thus extends further downwards on the outer side 11 in the third length section 15 in the vehicle's vertical direction 8 than in the second length section 14. In other words, the first distance 17 and / or the third distance 19 is smaller than the second distance 18.

[0041] In this embodiment, the maximum extent 22 of the outer wall 7, in particular the outer surface 10, relating to the vehicle's vertical direction 8, is arranged, or is arranged, at least substantially centrally in the vehicle's longitudinal direction 12 between the front axle 20a and the rear axle 21a, that is, between the vehicle axles 20 and 21. This means that the greatest distance extending in the vehicle's vertical direction 8 between the outer wall 7, in particular the outer surface 10, and the ground 16 is arranged, at least substantially centrally in the vehicle's longitudinal direction 12, between the vehicle axles 20 and 21. The greatest distance is, for example, the second distance 18. Thus, the second longitudinal region 14 can have the maximum extent 22.The highest extension 22 can in particular be understood to be a partial area, in particular a point, of the outer wall 7, in particular of the outer surface 10, located furthest up in the vehicle direction 8.

[0042] Fig. Figure 2 shows a schematic side view of a motor vehicle to illustrate a ramp angle 23, which can be referred to in particular as a ramp angle arc. The ramp angle 23 is, for example, the smallest angle between a first straight line 26, which lies at a first contact point 24 on a front wheel 25 of the motor vehicle, and a second straight line 29, which lies at a second contact point 27 on a rear wheel 28 of the motor vehicle. Preferably, an intersection point of the straight lines 26, 29, which is referred to in particular as the intersection point, touches a vehicle underbody, for example the outer wall 7. This intersection point, which is referred to in particular as the contact point, can be arranged centrally between the vehicle axes 20, 21 in the longitudinal direction 12 of the vehicle. However, it does not necessarily have to be arranged exactly in the middle between the vehicle axes 20, 21. In conjunction with Fig. 1 and Fig. It is evident from Figure 2 that the outer wall 7 can be designed in the length ranges 13, 14, 15 according to the ramp angle 23, that is, it can be adapted to the ramp angle 23. Thus, a shape of the outer wall 7 can correspond to the ramp angle 23 or at least be adapted to and / or based on the ramp angle 23.

[0043] Fig. Figure 3 shows a schematic bottom view of an outer wall 7a of another storage housing 2a, which is, for example, a conventional storage housing 2a. The outer wall 7a of the other storage housing 2a is, for example, planar in the longitudinal direction 12 of the vehicle. Fig. Figure 3 illustrates an intrusion of the outer wall 7a, particularly in the vehicle's upward direction 8, which results from a mechanical impact on the outer wall 7a, for example, during a bollard approach. The intrusion differs in various sub-areas 30 to 34 of the outer wall 7a. In the first of the sub-areas 30, the intrusion exhibits, for example, a first value. In the second sub-areas 31, which extend rearward from the first sub-areas 30 in the vehicle's longitudinal direction 12, the intrusion exhibits, for example, a second value different from the first value. In a third sub-area 32, which extends rearward from the second sub-areas 31 in the vehicle's longitudinal direction, the intrusion exhibits, for example, a third value different from both the first and second values.In the fourth sub-areas, which adjoin the third sub-areas 32 in the longitudinal direction 12 towards the rear, the intrusion exhibits, for example, the second value. In the fifth sub-areas 34, which adjoin the fourth sub-areas 33 in the longitudinal direction 12 towards the rear, the intrusion exhibits, for example, the first value. The third sub-areas 32 are, for example, centrally located sub-areas 32 with respect to sub-areas 30 to 34, in particular with respect to the vehicle axles 20, 21. The first and fifth sub-areas 30, 34 are, for example, located at the edges in the longitudinal direction 12. The second sub-areas 31 are, for example, located between the first and third sub-areas 30, 32 in the longitudinal direction 12, and the fourth sub-areas 33 are, for example, located between the third and fifth sub-areas 32, 34 in the longitudinal direction.The respective sub-ranges 30 to 34 can be understood to represent, in particular, a respective length range of the outer wall 7a. The first value corresponds, for example, to approximately 30 mm, the second value to approximately 25 mm, and the third value to approximately 20 mm. As in . Fig. 3. It can thus be seen, when considering curb ramps at the front and rear axles 20a, 21a, that, in order to fulfill a requirement referred to in particular as "bollard traps", the electrical energy storage device 3 arranged in the underfloor between the vehicle axles 20, 21 can be installed in a manner that is in Fig. Figure 1 shows an approximately symmetrical load and / or deformation pattern with, for example, up to 10 mm less deformation path in the center of the electrical energy storage device 3, in particular the storage housing 2, relative to the vehicle's longitudinal direction 12, compared to its areas near the front and rear axles 20a and 21a. A conventional electrical energy storage device or a conventional storage housing with a flat base, positioned taking into account the ramp angle 23, can therefore exceed the requirements regarding bollard traps in the central area relative to the vehicle's longitudinal direction. This is particularly due to the fact that, as in Fig. To recognize that intrusion is less pronounced in the central area, i.e., in the third sub-areas 32, the shape of the outer wall 7, in particular the outer surface 10, can be designed such that in central areas related to the vehicle's longitudinal direction 12, the respective distance between the outer wall 7 and the ground 16 is greater than in peripheral areas related to the vehicle's longitudinal direction 12. A design of the outer wall 7, referred to in particular as the ground design, can therefore be optimized for the requirement of "bollard traps" and positioned taking into account the ramp angle 23, whereby a vehicle height measurement chain can be optimized in this respect.

[0044] It is particularly preferred that the outer wall 7, especially the outer surface 10, is at least partially arcuate, that is, that it has an arcuate shape 35 at least partially. Preferably, the arcuate shape 35 is formed at least partially, and in particular predominantly or completely, by the first and second longitudinal sections 13, 14, and in particular by the third longitudinal section 15. It is particularly preferred that a vertex 36 of the arcuate shape 35 is located, or is located, at least substantially centrally between the front axle 20a and the rear axle 21b in the longitudinal direction 12 of the vehicle.Furthermore, in one embodiment, it is provided that the outer wall 7, in particular the outer surface 10, has a continuous, in particular steady, course in the longitudinal direction 12 of the vehicle, at least in the first and second length ranges 13, 14 and between the length ranges 13, 14, 15, in particular at least in the length ranges 13, 14, 15 and between the length ranges 13, 14, 15.

[0045] Fig.Figure 4 shows the storage housing 2 in a schematic partial sectional view according to a further embodiment, in which a respective deformation zone 37, 38, 39 adjoins the respective longitudinal sections 13, 14, 15 of the outer wall 7 upwards in the vehicle vertical direction 8, at least indirectly, and in particular directly. This means that a first deformation zone 37 adjoins the first longitudinal section 13 of the outer wall 7 upwards in the vehicle vertical direction 8, and that a second deformation zone 38 adjoins the second longitudinal section 14 of the outer wall 7 upwards in the vehicle vertical direction 8. In the exemplary embodiment, a third deformation zone 39 adjoins the third longitudinal section 15 upwards in the vehicle vertical direction 8. In particular, the respective deformation zone 37, 38, 39 is assigned to the respective longitudinal section 13, 14, 15.The respective heights 40, 41 of the deformation zones 37, 38, extending in the vehicle's vertical direction 8, are different. This means that the first deformation zone 37 has a first height 40 extending in the vehicle's vertical direction 8, and the second deformation zone 38 has a second height 41 extending in the vehicle's vertical direction 8, which differs from the first height 40. In the exemplary embodiment, the third deformation zone 39 has a third height 42 extending in the vehicle's vertical direction 8, which differs from the second height 41.

[0046] It is particularly preferred that the first height 40 of the first deformation zone 37, which adjoins the first longitudinal zone 13 in the vehicle's vertical direction 8, is greater than the second height 41 of the second deformation zone 38, which adjoins the second longitudinal zone 14 in the vehicle's vertical direction 8. Furthermore, in the exemplary embodiment, it is provided that the third height 42 of the third deformation zone 39, which adjoins the third longitudinal zone 15 in the vehicle's vertical direction 8, is greater than the second height 41. This means that a deformation zone, or the deformation zones 37, 38, 39 of the storage housing 2, are smaller, i.e., thinner, in the center relative to the vehicle's longitudinal direction than in the edge regions relative to the vehicle's longitudinal direction 12.

[0047] For example, the respective deformation area 38, 39, 40 is arranged in the vehicle's vertical direction 8 between the outer wall 7 and, in particular, electrical storage elements of the electrical energy storage device 3.

[0048] For example, the deformation areas 37, 38, 39 are arranged in a receiving space 43 of the storage housing 2, in particular of the electrical energy storage device 3, designed to receive the storage elements, or the receiving space 43 adjoins the deformation areas 37, 38, 39 upwards in the vehicle vertical direction 8.

[0049] Thus, the arc-shaped form 35 can be represented via the deformation zones 37, 38, 39, so that the storage elements, which are designed in particular as storage cells, can be arranged flat with respect to the vehicle's vertical direction 8, i.e., at the same height. In particular, the deformation zones 37, 38, 39 adjoin each other at the same height in the vehicle's vertical direction 8. This means that the deformation zones 37, 38, 39 terminate, for example, at the same height, i.e., at their upper edge.

[0050] Alternatively, the storage elements can be arranged at different heights. Alternatively or additionally, the storage elements can be arranged unevenly distributed along the longitudinal direction 12 of the vehicle. For example, no storage elements can be arranged in a central region of the storage housing 2 relative to the longitudinal direction 12 of the vehicle, particularly in the second longitudinal region 14, where, instead, peripheral components of the electrical energy storage system 3 can be arranged. Thus, for example, storage elements can be arranged only in the first and third longitudinal regions 13, 15, with a continuous housing element, particularly in the form of the outer wall 7, of the storage housing 2 running between the first and third longitudinal regions 14, 15, particularly across the second longitudinal region 14, thereby significantly increasing the stability of the storage housing 2.Furthermore, it is possible that the storage elements are arranged at the same height with respect to the vehicle's vertical direction 8, and that in the lower edge areas with respect to the vehicle's longitudinal direction 12 and the vehicle's vertical direction 8, for example, no storage elements are arranged, but rather peripheral components of the electrical energy storage system 3.

[0051] In this embodiment, the highest extent 22 of the outer wall 7, in particular the outer surface 10, relative to the vehicle's vertical direction 8, and the lowest extent 44 of the outer wall 7, in particular the outer surface 10, relative to the vehicle's vertical direction 8, are spaced apart from each other by at least 5 mm and / or a maximum of 20 mm. Thus, the difference between the first and second distances 17, 18 and / or the third and second distances 19, 18 can be, for example, at least 5 mm and / or a maximum of 20 mm. For example, the first and / or the third length region 13, 15, in particular, each has the lowest extent 44.

[0052] In particular, if the motor vehicle 5 is designed as an electrically powered motor vehicle 5, the motor vehicle 5, especially referred to as an electrified vehicle, may have, for example, the following special features: • Air spring: Alternatively, with flat storage and / or saddle storage, a residual ground clearance of 35 mm plus a suspension travel up to maximum compression can be used for the design on front and rear axles 20a, 21a. • Steel spring: The risk of bottoming out on vehicles with flat and / or saddle-type batteries can be significantly more critical, especially compared to vehicles without high-voltage batteries. Therefore, a minimum ground clearance of 115 mm under the high-voltage battery may be required for the initial design, for example, except in sport variants. • In particular, a correlation with the ramp angle 24 may need to be considered, as this must also be met. Protective components for the high-voltage storage unit may be required. Such components and a sill cover, especially a full sill cover, may, for example, be positioned lower than the electrical energy storage unit 3 in the vehicle's vertical direction 8. • For vehicles with flat storage units and / or saddle storage units, a minimum frame angle under the electrical energy storage unit 3 of, for example, 10° degrees may be required for an initial design, except for sports variants. • Protective skids for steel storage tanks may, for example, be designed for a ramp angle of 9.75°. In the case of lowered installations, a 9.5° angle for the skids may be permissible if the tank floor can withstand repeated impacts without abrasion. List of reference symbols 1. Arrangement 2 storage enclosures 2a additional storage enclosure 3 Electrical energy storage 4 Underbody area 5 motor vehicles 6 Mounting area 7 Outer wall 7a Outer wall of the further storage housing 8 Vehicle lifting direction 9 Subpage 10 outdoor area 11 Outside 12 Vehicle longitudinal direction 13 first length range 14 second length range 15 third length range 16 Subsurface 17 first gap 18 second gap 19 third distance 20 first vehicle axle 20a Front axle 21 second vehicle axle 21a Rear axle 22 highest extent 23 Ramp angles 24 first point of contact 25 front wheel 26 first straight 27 second contact point 28" rear wheel 29 second straight 30 first sub-area 31 second sub-area 32 third sub-area 33 fourth sub-area 34 fifth sub-area 35 arc-shaped 36 Vertex 37 first deformation area 38 second deformation area 39 third deformation area 40 first height 41 second height 42 third height 43 Recording Room 44 lowest extent 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 2016 212 273 A1

[0002]

Claims

[1] Storage housing (2) for an electrical energy storage device (3) of a motor vehicle (5), with at least one fastening area (6) by means of which the storage housing (2) is to be held in an underbody area (4) of the motor vehicle (5), and with at least one outer wall (7) which is arranged on a bottom side (9) of the storage housing (2) pointing downwards in the vertical direction (8) of the vehicle, characterized by that the outer wall (7) extends at least on its outer side (11) in at least two longitudinal regions (13, 14) which adjoin one another at least indirectly in the vehicle longitudinal direction (12) to different lengths in the vehicle vertical direction (8). [2] Storage housing (2) according to claim 1, characterized byin that a first of the longitudinal regions (13) of the outer wall (7) adjoins the second longitudinal region (14) in the longitudinal direction (12) of the motor vehicle (5) having two vehicle axles (20, 21) in the direction of one of the vehicle axles (20, 21) to be arranged closer to the first longitudinal region (13), and the outer wall (7) extends further downwards in the vertical direction (8) of the vehicle, at least on its outer side (11), in the first longitudinal region (13) than in the second longitudinal region (14). [3] Storage housing (2) according to claim 1 or 2, characterized by that a highest extension (22) of the outer wall (7) in the vehicle longitudinal direction (12) related to the vehicle vertical direction (8) is to be arranged at least substantially centrally between a front axle (20a) and a rear axle (21a) of the motor vehicle (5). [4] Storage housing (2) according to one of the preceding claims, characterized bythat the outer wall (7) has a continuous course at least in the longitudinal regions (13, 14) and between the longitudinal regions (13, 14) in the vehicle longitudinal direction (12). [5] Storage housing (2) according to one of the preceding claims, characterized by that the outer wall (7) is curved at least in some areas. [6] Storage housing (2) according to claim 5, characterized by that an apex (36) of the arcuate shape (35) is to be arranged in the vehicle longitudinal direction (12) at least substantially centrally between a front axle (20a) and a rear axle (21a) of the motor vehicle. [7] Storage housing (2) according to one of the preceding claims, characterized bythat a respective deformation region (37, 38) adjoins the respective longitudinal region (13, 14) of the outer wall (7) at least indirectly upwards in the vehicle vertical direction (8), wherein a height (40, 41) of the deformation regions (37, 38) extending in the vehicle vertical direction (8) is different. [8] Storage housing (2) according to claim 7 with reference back to claim 2, characterized by that the height (40, 41) of the deformation region (37) adjoining the first longitudinal region (13) in the vehicle vertical direction (8) is greater than the height (41) of the deformation region (38) adjoining the second longitudinal region (14) in the vehicle vertical direction (8). [9] Storage housing (2) according to one of the preceding claims, characterized bythat a highest extension (22) of the outer wall (7) related to the vehicle vertical direction (8) and a lowest extension (44) of the outer wall (7) related to the vehicle vertical direction (8) are spaced apart from one another by at least 5 millimeters and / or a maximum of 20 millimeters in the vehicle vertical direction (8). [10] Arrangement (1) of a storage housing (2) for an electrical energy storage device (3) in an underbody area (4) of a motor vehicle (5), in which the storage housing (2) has at least one fastening area (6), via which the storage housing (2) is held in the underbody area (4), and at least one outer wall (7) which is arranged on a bottom side (9) of the storage housing (2) pointing downwards in the vehicle vertical direction (8), characterized bythat the outer wall (7) extends at least on its outer side (11) in at least two longitudinal regions (13, 14) which adjoin one another at least indirectly in the vehicle longitudinal direction (12) to different lengths in the vehicle vertical direction (8).

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