Energy storage floor structure for electrically drivable motor vehicle

Abstract

The invention relates to an energy storage underbody structure for an electrically drivable motor vehicle, comprising an underbody structure (22) having respective longitudinal and transverse beams (34), and an electric energy storage device having a storage housing (20) arranged on an underside of the underbody structure (22), the storage housing is connected to the corresponding longitudinal or transverse member (34) of the base structure (22) at least in one length region along a fastening plane (FE) by means of mechanical connecting means (35), and the storage housing is sealed from the corresponding longitudinal or transverse member (34) of the base structure (22) at least in the length region along a sealing plane (DE) by means of a seal (38). In order to achieve an energy storage base structure in which the storage housing (20) is particularly advantageously protected against excessive deformation and battery cell intrusion, the fastening plane (FE) and the sealing plane (DE) are arranged at a distance from one another in respective length regions.

Description

Technical Field

[0001] The invention relates to an energy storage floor structure for an electrically driven motor vehicle according to the preamble of claim 1 . Background Art

[0002] Such an energy storage substructure according to the prior art is shown in FIG. 1 in a partial section along a section extending in the vehicle transverse direction or in the vehicle height direction. It can be seen here that an electric energy storage device 1 for an electric drive of a motor vehicle comprises a storage housing 2, which is essentially composed of an upper part 3 and a lower part 4, and the storage housing 2 is connected to a lateral longitudinal beam or side sill 8 via the upper part and the lower part in the outer longitudinal region by means of corresponding screw connections 7. The side sill 8 is composed of a plurality of sheet metal shell elements, such as an inner part 9, an outer part 10 and an angle part 11. In the interior of the side sill 8, a deformation element 12 can be seen, by which corresponding accident forces (which are described in the present case by dashed arrows F) can be absorbed and transmitted in the direction of the center of the vehicle in the event of a motor vehicle collision, in particular a pole collision. The flange connection 5 is mounted on the side sill 8 by means of the screw connection 7 via the inner angle part 11.

[0003] As can also be seen from FIG. 1 , the combination of the angle component 11 and the flange connection 5 of the storage housing 2 forms a fastening plane FE, which is depicted by the corresponding dot-dash line. Furthermore, a sealing element 13 is arranged on the inner side of the threaded connection 7 between the angle component 11 and the flange connection 5 of the storage housing 2, which surrounds the storage housing 2 on the circumference. Since the sealing element 13 is also located between the angle component 11 and the flange connection 5, the corresponding sealing plane DE now coincides with the sealing plane FE. Or in other words, the fastening plane FE and the sealing plane DE are located in a common plane.

[0004] As already explained above, if a side impact now occurs and a corresponding force F is input, the screw connections 7 tend to bunch up, so that they, together with the angle piece 12 and the flange connection 5, may be moved relatively far in the vehicle transverse direction toward the center of the vehicle, so that the safety width B of the energy storage device 1 may be impaired and significant deformation of the storage housing 2 and intrusion into the battery cells may occur. It is also disadvantageous here that the arrangement of the sealing element 13 arranged inside the screw connection 7 in the common fastening plane FE and sealing plane DE results in a large extension of the flange connection 5 and the angle piece 12 in the vehicle transverse direction (y direction), which again increases the risk of corresponding intrusion into the battery cells. Summary of the invention

[0005] It is therefore an object of the present invention to create an energy storage substructure which has a higher safety against corresponding damage to the storage housing or prevents intrusion into the battery cells.

[0006] This object is achieved according to the invention by an energy storage substructure having the features of claim 1. Advantageous developments of the invention are the subject matter of the dependent claims.

[0007] The energy storage substructure according to the invention for an electrically driven motor vehicle comprises, on the one hand, a substructure with corresponding longitudinal and transverse beams, and, on the other hand, an electrical energy storage device, which has a storage housing arranged on the underside of the substructure, to which the corresponding longitudinal and transverse beams of the substructure are connected at least in one length region along a fastening plane by mechanical connecting means and sealed at least in said length region along a sealing plane with respect to the corresponding longitudinal beams or transverse beams of the substructure by a seal. In order to realize an energy storage substructure in this way and in which the storage housing is particularly advantageously protected against excessive deformation and intrusion of battery cells, according to the invention, the fastening plane and the sealing plane are arranged spaced apart from each other in the corresponding length region. The core of the invention is therefore to separate the fastening plane from the sealing plane or to place the fastening plane outside the transverse load path along which forces act in the vehicle transverse direction in the event of accident-induced force loading due to a side impact, in particular a side pole impact. In particular, by separating the fastening plane from the sealing plane, the connection of the storage housing to the corresponding longitudinal beam or transverse beam of the floor structure can be dimensioned smaller and thus the width available, for example, in the event of a side impact of the motor vehicle can be increased. Thus, for example, a deformation zone is created in the connection region between the storage housing and the floor structure, which allows deformation without any intrusion into the storage device 1.

[0008] In a further embodiment of the invention, it has proven to be advantageous if the fastening plane and the sealing plane extend at least substantially parallel to one another in the longitudinal direction of the vehicle and in the transverse direction of the vehicle. Thus, in particular in the height direction of the vehicle, a corresponding separation of the fastening plane and the sealing plane can be achieved, which helps to reduce the risk of intrusion into the energy storage device according to the invention.

[0009] Furthermore, it has proven to be advantageous if the sealing plane is arranged above the fastening plane in the vehicle height direction. The fastening plane is thus offset downward so that corresponding mechanical connecting means, in particular screw connections, can be arranged at a greater distance from the corresponding battery cells of the energy storage device.

[0010] Furthermore, it has proven to be advantageous if the mechanical connection means is designed as a screw connection in the fastening plane. Such a screw connection enables a particularly reliable connection to the base structure in the fastening plane.

[0011] Furthermore, it has proven to be advantageous if the screw connections are arranged at least substantially coinciding with the main profile of the corresponding longitudinal beam or cross beam of the floor structure with respect to the vehicle height direction. This means that the corresponding screw connections are arranged, for example, offset outwardly so far in the vehicle transverse direction that they coincide with the corresponding longitudinal beam or side sill when viewed in the vehicle height direction or are located below the corresponding longitudinal beam or side sill. As a result, particularly advantageous widths or particularly advantageous spacings of the screw connections from the energy storage device can be achieved.

[0012] Furthermore, it has proven to be advantageous if the flange between the upper part and the lower part of the storage housing is located in the fastening plane of the storage housing on the base structure. Thus, a particularly stable connection to the corresponding side sill of the base structure is produced by means of corresponding mechanical connecting means via the flange connection of the upper part and the lower part of the storage housing.

[0013] Finally, it has proven to be advantageous if the upper part of the storage housing at least partially forms the vehicle floor of the vehicle body in the region of the passenger compartment, thereby achieving a particularly weight-effective floor assembly.

[0014] Further features of the invention are derived from the claims, the drawings and the description of the drawings. The features and feature combinations mentioned above in the description and the features and feature combinations mentioned below in the description of the drawings and / or shown individually in the drawings can be used not only in the respectively described combination but also in other combinations or individually. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will now be explained in more detail with the aid of preferred embodiments and with reference to the accompanying drawings. The accompanying drawings are as follows:

[0016] 1 shows a partial sectional view of an energy storage substructure according to the prior art along a section plane extending in the vehicle transverse direction or in the vehicle height direction, wherein a storage housing of an energy storage device for an electric drive of a motor vehicle is connected to a side sill of a substructure of a motor vehicle body in the region of a fastening plane by means of a screw connection and is sealed relative to the side sill along a sealing plane by means of a seal, the fastening plane and the sealing plane coinciding with each other;

[0017] Figure 2a partial sectional view along a section extending in the vehicle transverse direction or in the vehicle height direction of an energy storage substructure according to the invention, the energy storage substructure comprising a storage housing which is connected to a side sill of the substructure along a fastening plane by means of a screw connection and which is sealed relative to the side sill along a sealing plane by means of a seal, the fastening plane and the sealing plane being arranged spaced apart from one another in the vehicle height direction;

[0018] Figure 3 and Figure 2 Similarly, a partial and perspective sectional view of the energy storage substructure is shown along a section plane extending in the vehicle transverse direction or in the vehicle height direction. DETAILED DESCRIPTION

[0019] FIG. 1 shows a cross-sectional view of the energy storage substructure according to the prior art, which has been described above, and FIG. Figure 2 and Figure 3 The energy storage substructure is shown in a partial sectional view or in a partial perspective sectional view in a section extending along the respective vehicle transverse direction or in the vehicle transverse direction (y direction) or in the vehicle height direction (z direction). Figure 2 It can be seen that on a vehicle outer side or a vehicle longitudinal side, for example on the right vehicle outer side viewed in the forward driving direction, the storage housing 20 is connected to a side sill 21 of the bottom structure 22; Figure 3 On an opposite vehicle outer side or vehicle longitudinal side, for example on the left vehicle outer side in the present case, as viewed in the forward driving direction, a similar connection of storage housing 20 to side sill 21 of floor structure 22 is shown.

[0020] In the present case, the storage housing 20 is used to accommodate a plurality of storage cells or battery modules of an energy storage device 23 for an electric drive of a passenger car, which is arranged in the present case in a manner known per se under an underfloor structure 22. In this case, the storage housing 20 comprises an upper part 23 and a lower part 24, which are connected to one another on the circumferential side in the region of a flange connection 25 by corresponding flanges 26, 27. Thus, in the Figure 2 and Figure 3 In the embodiment of the present invention, the length region of the flange connection 25 of the storage housing 20 or the length region of the flanges 26, 27 of the storage housing extends on the respective vehicle outer side along the corresponding side sills 21. A similar connection is realized on the floor structure via corresponding, not visible, cross members, via which the respective side sills 21 are connected to one another, in the front and rear regions of the storage housing 20. The present floor structure is thus formed in a manner known per se from the respective longitudinal beams or side sills 21 and the associated cross members, which extend between the side sills 21.

[0021] The side sills 21 themselves are each visible as an assembly of corresponding elements, in particular an upper element 28, a plurality of lower inner shell elements 29, 30 and an outer shell element 31, by means of which a box-shaped profile with a cavity 32 is formed, within which an extruded profile is arranged as a deformation element 33. The deformation element 33 is arranged at the height of the vehicle floor in the vehicle height direction (z direction), but the vehicle floor is formed at least partially by the upper part 23 of the storage housing 20 in the present case. For this purpose, the storage housing 20 is arranged with its upper part 23 on the lower side of corresponding cross members 34, which are spaced apart from each other in the vehicle longitudinal direction (x direction) and extend in the vehicle transverse direction (y direction) between the side sills 21. In the present case, the upper part 23 of the storage housing 20 thus forms the main floor of the vehicle floor, which extends, for example, from the front end wall of the passenger compartment with the associated lower end wall cross member to the rear as far as a rear wall below the rear seat of the vehicle body of the motor vehicle. However, it is to be taken into account as being included within the scope of the invention that the energy storage floor structure can be designed in such a way that a separate vehicle floor can be provided which is not formed by the upper part of the storage housing.

[0022] However, in the present case, the deformation element 33 - as in Figure 2 and Figure 3 2—extends at the height of the corresponding longitudinal beam 34 of the floor structure, the corresponding longitudinal beam or the side sill 21 .

[0023] If otherwise Figure 2 and Figure 3 As can be seen, the storage housing 20 is connected to the housing element 30 of the side sill 21 via the flange connection 25 or via the flanges 26, 27 of the upper part 23 and the lower part 24 via mechanical connection means in the form of screw connections 35. These screw connections 35 in the present case include threaded sleeves 36 mounted on the housing element 30 and screws 37, which pass through the flange connection 25 of the storage housing 20. In this way, the storage housing 20 is thus connected over at least approximately the entire length region of the storage housing 20 or the corresponding side sill 21 along a fastening plane FE, which is produced at least substantially horizontally in the longitudinal direction of the vehicle (x direction) and in the transverse direction of the vehicle (y direction) in the contact region of the flange connection 25 on the housing element 30.

[0024] In addition, by Figure 2 and Figure 3It can be seen that the upper part 23 of the storage housing 20 is sealed relative to the leg 39 of the plate shell element 30 by the seal 38 at a spacing offset toward the inner side in the vehicle transverse direction (y direction). The plate shell element 30 extends here along a sealing plane DE over at least approximately the entire length area of ​​the storage housing 20 or the corresponding side sill 21, which extends in the longitudinal direction of the vehicle (x direction) and in the transverse direction of the vehicle (y direction), and the sealing plane extends at least essentially horizontally. The storage housing 20 is therefore sealed relative to the base structure 22 by means of the seal 38. In the present case, as described by Figure 2 and Figure 3 As can be seen, this is achieved with respect to the corresponding side sills 21 on the side. In the front area and in the rear area, the storage housing 20 is fastened and sealed similarly within the same fastening plane DE or sealing plane DE by means of corresponding screw connections 35 or by a surrounding seal 38, which is screwed with respect to the front and rear crossbeams, and the seal is then also arranged at a distance before or after the corresponding screw connection 35.

[0025] It can be seen that in the present case, the fastening plane FE and the sealing plane DE are arranged at a distance A from each other in the vehicle height direction (z direction) in the respectively corresponding length region, in the present case approximately over the corresponding length of the storage housing 20 and the associated side sill 21. Thus, in contrast to the previous prior art according to FIG. 1 , in which fastening and sealing are realized in one plane, in the present case a height distance is realized between the fastening plane FE and the sealing plane DE, so that in the present case the corresponding screw connection 35 is arranged at least substantially coincident with the corresponding main profile, which forms the cavity of the side sill 21, with respect to the vehicle height direction (z direction), i.e. in the viewing direction of the vehicle height direction (z direction) or, for example, in the viewing direction from top to bottom. Thus, in the present case, the screw connection 35 is arranged coincident with the deformation element 33, viewed in the vehicle height direction (z direction), below the deformation element. In contrast, the sealing plane DE is at the level of the lower end of the deformation element 33. Thus, by means of the height offset A of the fastening plane FE from the sealing plane DE, for example, the arrangement of the respective screw connection 35 can be realized closer to the vehicle exterior and coincident with the associated side sill 21, so that an increased lateral spacing S between the respective screw connection 35 and the respective battery cell of the energy storage device indicated by the dashed line 40 is produced. Since the respective screw connection 35 is therefore not located in the same plane as the seal 38, they can be arranged closer to the vehicle exterior or closer to the corresponding side sill 21. As a result, the fastening plane FE is shifted downward and outward along the side sill 21, so that in the event of a side impact caused by an accident, the fastening plane is no longer in the transverse load path indicated by the arrow F and is therefore at a greater distance from the respective battery cell of the energy storage device in the vehicle transverse direction (y direction). Thus, a deformation zone is realized in the region of the storage housing 20, which allows deformation without causing intrusion into the battery cell.

[0026] The distance between the fastening plane FE and the sealing plane DE is selected in this case such that the necessary contact pressure or corresponding pressing of the seal 38 against the leg 39 of the sheet metal shell element 30 is achieved by means of the screw connection 35 . Reference numerals list

[0027] 20 Storage Case

[0028] 21 side sill

[0029] 22 Bottom structure

[0030] 23 Upper parts

[0031] 24 lower parts

[0032] 25 Flange connection

[0033] 26 Flange

[0034] 27 Flange

[0035] 28 Plate and shell elements

[0036] 29 Plate and shell elements

[0037] 30 Plate and shell elements

[0038] 31 Plate and shell components

[0039] 32 Cavity

[0040] 33Deformation element

[0041] 34 beam

[0042] 35 threaded connection device

[0043] 36 thread sleeve

[0044] 37 screws

[0045] 38 Seals

[0046] 39 Legs

[0047] 40 lines / battery cell

[0048] F-Force

[0049] AHeight Spacing

[0050] S side spacing

Claims

1. An energy storage substructure for an electrically driven motor vehicle, comprising a substructure (22) having corresponding longitudinal beams and transverse beams (34), and comprising an electrical energy storage device having a storage housing (20) arranged on the underside of the substructure (22), the storage housing being connected to the corresponding longitudinal beam or transverse beam (34) of the substructure (22) at least in one length region along a fastening plane (FE) by means of a mechanical connecting means (35), and the storage housing being sealed relative to the corresponding longitudinal beam or transverse beam (34) of the substructure (22) at least in said length region along a sealing plane (DE) by means of a seal (38), characterized in that The fastening plane (FE) and the sealing plane (DE) are arranged at a distance from one another in the respective length region.

2. The energy storage bottom structure according to claim 1, characterized in that: The fastening plane (FE) and the sealing plane (DE) extend at least substantially parallel to one another in the longitudinal direction of the vehicle and in the transverse direction of the vehicle.

3. The energy storage bottom structure according to claim 1 or 2, characterized in that: The sealing plane (DE) is arranged above the fastening plane (FE) in the vehicle height direction.

4. The energy storage substructure according to any one of the preceding claims, characterized in that: The mechanical connection means (35) in the fastening plane (FE) is designed as a screw connection (35).

5. The energy storage substructure according to any one of the preceding claims, characterized in that: The screw connection (35) is arranged at least substantially coincidentally with a main profile of a corresponding longitudinal beam or transverse beam (34) of the floor structure (22) with respect to the vehicle height direction.

6. The energy storage substructure according to any one of the preceding claims, characterized in that: The threaded connection (35) is arranged at least substantially below the load path (F) of the substructure (22) with respect to the vehicle height direction.

7. The energy storage substructure according to any one of the preceding claims, characterized in that The flanges (26, 27) between the upper part (23) and the lower part (24) of the storage housing (20) are located in a fastening plane (FE) of the storage housing (20) on the base structure (22).

8. The energy storage substructure according to any one of the preceding claims, characterized in that The upper part (23) of the storage housing (20) forms the vehicle underbody of the vehicle body at least in sections in the region of the passenger compartment.

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