Energy storage floor system for electrically drivable motor vehicle

Abstract

The invention relates to an energy storage floor system for an electrically drivable motor vehicle, comprising a storage housing (11) which is arranged below a vehicle floor (2) and which has an interface region (20), the front end (12) of which adjoins a vehicle front (3) of the motor vehicle. In order to provide an energy store-floor system having an energy store (10) which is particularly advantageously protected in the event of a frontal collision of a motor vehicle, a protective element (21) is provided on the front end (12) outside the storage housing (11) of the energy store (10) in order to avoid excessive intrusion caused by an accident.

Description

Technical Field

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

[0002] Such an energy storage floor system, which is already known, for example, from DE 102021 101 730 A1, comprises a storage housing of an energy storage arranged under the floor, which is arranged below the vehicle floor and has an interface region. Here, the storage housing has a bulge or a two-layer design of the individual battery cells or battery modules in the region of the central tunnel of the vehicle floor, which adjoins with its front end the vehicle front part of the motor vehicle, in the region of which, for example, the individual components of the vehicle front part are arranged.

[0003] However, such components have the problem that they can be pushed back by an accident, for example in the event of a head-on collision with an obstacle, such as a rigid barrier or an accident partner, a collision pole or also with an offset barrier, which can damage the front end of the storage housing, in particular in the region of the central tunnel. In the worst case, thermal events can occur as a result.

[0004] For this reason, in energy storage floor systems according to the prior art, structural elements are provided which act in the manner of tie rods and are fastened with their ends to the engine mount at the front of the vehicle or to the respectively laterally associated longitudinal beams. Summary of the invention

[0005] The object of the present invention is to provide an energy storage device floor system in which the energy storage device is protected in a particularly advantageous manner from excessive penetration in the event of an accident-induced backward movement of components.

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

[0007] An energy storage floor system according to the invention for a motor vehicle with an electric drive comprises a storage housing which is arranged below the vehicle floor and has an interface region and which adjoins the vehicle front part of the motor vehicle with a front end.

[0008] In order to realize an energy storage device-floor system with an energy storage device that is particularly advantageously protected in the event of a frontal impact of a motor vehicle, it is provided according to the invention that a protective element is provided on the storage housing of the energy storage device at the front end on the outside of the storage housing of the energy storage device, by means of which excessive intrusion of, for example, components of the front of the vehicle or the like into the storage housing of the energy storage device due to an accident can be prevented. Furthermore, by providing the protective element on the outside of the storage housing of the energy storage device, particularly advantageous preassembly is achieved, so that the protective element can be correspondingly preassembled on the storage housing before the storage housing is fastened / mounted on the motor vehicle body. Overall, a particularly advantageous preassembled assembly of the storage housing and the protective element is thus achieved.

[0009] In another embodiment of the invention, the front end of the storage housing of the energy storage device and the protective element protrude in the longitudinal direction of the vehicle relative to the vehicle floor in the direction of the front of the vehicle. Such a protrusion is necessary, for example, when the connection area of ​​the energy storage device is required for connecting various wires, cables or the like. Thus, the front end of the storage housing is protected in a particularly advantageous manner by the protective element, for example, against excessive damage due to a frontal collision and the associated intrusion into the storage housing.

[0010] Furthermore, it has been found to be advantageous if the protective element is arranged in the middle region of the storage housing of the energy storage device with respect to the vehicle transverse direction. It is in this central middle region of the storage housing that significant intrusions can occur, for example when the corresponding component or assembly is moved backwards due to an accident.

[0011] In this regard, it has proven to be advantageous if the energy accumulator has a projection in the region of the center tunnel of the vehicle floor that is covered by the protective element. As a result, the free structural space within the center tunnel can be optimally utilized by the energy accumulator, for example to construct a two-level energy accumulator, wherein the energy accumulator can be optimally protected by the protective element arranged in the center region of the energy accumulator relative to the vehicle transverse direction.

[0012] Another advantageous embodiment of the invention provides that the protective element is formed by an outer metal part (in particular a sheet metal molded part) and by an energy-absorbing plastic part arranged on the inner side of the metal part. A double shell design with a metal outer skin and a corresponding plastic (for example a hard foam material) on the inside makes it possible, on the one hand, to protect the reservoir housing or the energy storage device from penetrating parts and, on the other hand, to distribute loads in an optimal manner and thus reduce deformations.

[0013] The outer metal part and the energy-absorbing plastic part arranged inside the metal part are here in particular manufactured separately from one another and connected to one another via corresponding connecting elements. Alternatively, a joining connection is of course also conceivable. Likewise, alternatively, it is of course also conceivable to injection-mold the corresponding plastic part onto the outer metal part or to place the same on the metal outer part by molding.

[0014] Another advantageous embodiment of the invention provides that the protective element covers the interface region of the energy accumulator. It is precisely the interface region of the energy accumulator that has proven to be a particularly critical location that must be particularly reliably protected from damage caused by accident-induced force loading.

[0015] Another advantageous embodiment of the invention provides that the protective element is connected to the reservoir housing of the energy storage device in a force-locking and / or form-locking manner. A form-locking connection or a corresponding configuration of the protective element that is coordinated with the shape of the reservoir housing has the advantage that a large-scale support of the protective element on the reservoir housing can be achieved. This particularly advantageously avoids excessive penetration into the reservoir housing. A force-locking connection enables a correspondingly stable connection of the protective element to the reservoir housing.

[0016] Another advantageous embodiment of the invention provides that the storage housing is formed from an upper part and a lower part which are connected to one another in the region of the partition plane, wherein the protective element is arranged and fastened only on the lower part. This results in a particularly advantageous fastening of the protective element on the lower part, wherein the protective element covers the upper part, in particular in the region of the raised portion, and thus also ensures corresponding protection of the upper part in the covered region.

[0017] Finally, it has been found to be advantageous if the protective element is arranged at the front end of the accumulator housing of the energy accumulator in the region of a cutout of the corresponding energy absorption profile. In this case, the energy absorption profile can be used to further absorb the impact energy in the event of a frontal impact, wherein the protective element arranged in the region of the cutout ensures that the accumulator housing or the energy accumulator is accordingly protected from excessive penetration.

[0018] Other features of the invention are apparent from the claims, the drawings and the description of the drawings. The features and feature combinations mentioned above in the description of the drawings 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 given combination but also in other combinations or individually. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will now be described in more detail according to preferred embodiments and with reference to the accompanying drawings. In the drawings:

[0020] Figure 1A partial top view of an energy storage device-floor system according to the invention for an electrically driven motor vehicle is shown, the motor vehicle having a storage housing of an energy storage device arranged below a vehicle floor and a vehicle front part of the motor vehicle, to which the vehicle floor or the storage housing adjoins at a front end, wherein a protective element is arranged on the storage housing in the region of a central tunnel of the vehicle floor at a front end outside the storage housing of the energy storage device, by means of which protective element excessive intrusion into the storage housing caused by an accident can be avoided in the event of a frontal collision of the motor vehicle;

[0021] Figure 2 A partial perspective view from the oblique front of a storage housing of an energy storage device floor system according to the invention is shown, in which a protective element is arranged in a positive and non-positive manner in the central front region of the storage housing;

[0022] Figure 3 Shows that according to Figure 2 A perspective view of a protective element from the outside and obliquely from the rear, the protective element being formed by an outer metal component and an energy-absorbing plastic component arranged on the inner side thereof;

[0023] Figure 4 shows a corresponding partial top view of an energy storage device-floor system according to the invention before and after a frontal impact with a column;

[0024] Figure 5 Shown in a similar Figure 4 A partial perspective side view through the energy storage device-floor system according to the invention along a section extending in the vehicle height direction or in the vehicle longitudinal direction after the impact pillar shown in the lower part of FIG.

[0025] Figure 6 A corresponding partial top view of an energy storage device-floor system according to the invention is shown before or after a frontal collision of a motor vehicle with an obstacle with a small overlap width;

[0026] Figure 7 The protective element of the accumulator-floor system is shown in FIG. Figure 6 A perspective top view of a detail after a frontal collision with a small overlap width and loading with accident-induced forces. DETAILED DESCRIPTION

[0027] Figure 1A motor vehicle body 1 is shown in a partial top view of a passenger car, which comprises a vehicle floor 2 on the lower side of the passenger compartment, which merges into the vehicle front part 3 at its front end. In particular, the respective front ends of the side sills 4 can be seen from the vehicle floor 2, between which a front lower cross member 5 extends at the front end of the vehicle floor 2, and individual floor components 6 of the vehicle floor 2, such as floor panels, extend forward in the longitudinal direction of the vehicle up to the front lower cross member. A front end wall 7 extends in the region above the cross member 5, which defines the passenger compartment at the front or separates the passenger compartment from the vehicle front part 3.

[0028] Furthermore, a central tunnel 8 can be seen from the vehicle floor 2, which extends rearward in the longitudinal direction of the vehicle in a central region of the vehicle floor. The central tunnel 8 is usually used in vehicle variants with an internal combustion engine (ICE) to accommodate a cardan shaft for connecting the internal combustion engine arranged in the front region of the vehicle to a rear axle drive for a driven rear axle of the motor vehicle.

[0029] In the present case of a motor vehicle with pure electric drive (BEV) or, if necessary, also with hybrid drive (PHEV), the central tunnel serves to receive a raised portion 9 of an energy accumulator 10, which will be shown in greater detail below, whose storage housing 11 is arranged under the vehicle floor 2, i.e., under the corresponding floor part 6, and at least substantially between the corresponding side extensions 4 or behind the cross member 5.

[0030] In addition, by Figure 1 It can be seen that the front end 12 of the storage housing 11 of the energy storage device 10 or in particular the front end of the raised portion 9 protrudes in the longitudinal direction of the vehicle relative to the vehicle floor 2 or in the direction of the vehicle front part 3 relative to the crossbeam 5 closed forward at the vehicle floor 2, and is adjacent to the vehicle front part 3 with this front end 12.

[0031] From the vehicle front part 3, the main longitudinal beams 13 are first visible, which extend parallel to one another in the longitudinal direction of the vehicle at the level of the main longitudinal beam plane. These main longitudinal beams 13 are also referred to as engine longitudinal beams. The main longitudinal beams 13 in the region of the end wall 7 or the cross beam 5 are connected to the passenger compartment and the vehicle floor 2 at the rear, or with individual longitudinal beam parts, transition into the side sills 4 on the one hand and into corresponding beams in the region of the central tunnel 8 on the other hand. At the front end, a bumper cross beam 14 is supported on the main longitudinal beams 13 by means of corresponding energy-absorbing elements.

[0032] A front axle carrier 15 or a similar subframe is fixed to the underside of the main longitudinal beam 13, where the individual chassis components of the front axle are fixed on the one hand and individual assemblies, components or the like are loaded on the other hand. In the present embodiment, the electric refrigerant compressor 16 is loaded on the front axle carrier 15 by means of a retaining device 30 at a distance in front of the front end 12 of the bulge 9 or the front end of the storage housing 11, which is therefore arranged in the region of the center tunnel 8 or the bulge 9, coinciding with the front end 12 of the storage housing 11 with respect to the vehicle height direction and the vehicle transverse direction. The crossbeam 17 of the front axle carrier 15, which is fixed to the underside of the respective main longitudinal beam 13, also extends in the vicinity of the front end 12 of the storage housing 11 and in the region of the bulge 9.

[0033] Figure 2 The front end 12 of the accumulator housing 11 of the accumulator 10, which is arranged under the vehicle floor, is shown in a partial perspective view from the front obliquely from above. Here, the accumulator housing 11 comprises an upper part 18 and a lower part 19, which are separated from each other or connected to each other in the region of a dividing plane T extending horizontally in the vehicle transverse direction or in the vehicle longitudinal direction.

[0034] also by Figure 2 The projection 9 can be seen, with which the storage housing 11 of the energy storage device 10 projects into the central tunnel 8 of the vehicle floor 2 in the manner described. In the region of this projection 9, the energy storage device 10 is designed in two layers, that is to say, the battery cells or battery modules are arranged one above the other in two layers with respect to the vehicle height direction. The projection 9 extends to the front end 12 of the storage housing 11 and thus adjoins the vehicle front part 3 or an associated assembly, such as an electric refrigerant compressor 16, in the manner described.

[0035] Furthermore, at the front end of the projection 9, on the lower part 19 of the storage housing 11, an interface region 20 of the energy storage device 10 is provided, via which the energy storage device 10 is connected, for example, to electrical lines or media lines, for example coolant lines. Furthermore, corresponding power electronics components can be accommodated in the region of the interface region 20. In this case, the interface region 20 extends substantially at the level of the partition plane T.

[0036] The interface region 20 and the front end 12 of the storage housing 11 of the energy storage device 10 are both arranged in a concealed manner behind a protective element 21 for protection reasons which will be explained in more detail below. Figure 3 Shown in a separate perspective view from oblique rear.

[0037] In the present case, the protective element 21 is arranged in the region of the cutouts 29 of the respective energy-absorbing profile at the front end of the lower part 18 of the storage housing 11 of the energy storage device 10. The energy-absorbing profile 28 serves to further absorb the collision energy in the event of a frontal collision, wherein the protective element 21 arranged in the region of the cutout 29 ensures that the storage housing 11 or the energy storage device 10 is protected against excessive penetration.

[0038] In the present case, the protective element 21 is at least substantially constructed in two parts with an outer metal part 22, which in the present case is constructed as a sheet metal molded part (sheet metal molded part). Of course, other designs consisting of metal or, if necessary, plastic, in particular fiber-reinforced plastic, are also conceivable. On the inner side of the metal part 22, that is, on the side of the metal part 22 facing the storage housing 11 of the energy storage device 10, an energy-absorbing plastic part 23 is arranged, which is formed, for example, from a plastic hard foam. Of course, other designs of the components that absorb here are also conceivable.

[0039] The two components of the protective element or protective cover 21, namely the metal part 22 and the plastic part 23, are designed separately and are connected, for example, by means of Figure 2 The connecting elements 24 shown in the figure are connected to each other. Alternatively, it is also conceivable that the plastic component 23 is, for example, injection-molded on the metal component 22. In addition, it is worth mentioning that the plastic component 23 is coordinated with the inner shape of the metal component 22 in its outer shape.

[0040] In addition, especially by Figure 2 , it can be seen that the protective element 21 is at least substantially adapted in a form-fitting manner to the shape of the interface region 20 or to the shape of the bulge 9 of the storage housing 11. Form-fitting is to be understood here as being adapted to the storage housing 11 or the interface region 20 so that it is supported accordingly in the longitudinal direction of the vehicle to the rear or in the transverse direction of the vehicle and in the height direction of the vehicle (from top to bottom) on the storage housing 11. Furthermore, the protective element 21 is connected to the storage housing 11 in a force-fitting manner via corresponding screw connection elements 25 by means of angle elements 31. In particular, the outer angle elements 31 are also connected in a force-fitting and form-fitting manner to the lower part 19, so that a particularly advantageous retention of the protective element 21 is achieved when forces are applied due to an accident. In the present case, the protective element 21 is connected here only to the lower part 19 of the storage housing 11, wherein the protective element 21 extends substantially above the partition plane T between the upper part 18 and the lower part 19 of the storage housing 11.

[0041] Now, in the following, according to Figures 4 to 7 To illustrate the specific functions of the protection element 21:

[0042] Here, Figure 4 The corresponding detailed top view of the body of the motor vehicle is shown in the vehicle front part 3 and in the area of ​​the transition to the vehicle floor 2 , beneath which a storage housing 11 of an energy storage device 10 is arranged, wherein the storage housing is particularly visible in the area of ​​the center tunnel 8 with the elevation 9 . Figure 4 The upper diagram of the motor vehicle before the collision with the column 26 is shown here, according to Figure 4 , the column penetrates into the motor vehicle approximately in the center of the vehicle front part 3 after a central impact of the motor vehicle. Due to a frontal impact or a column impact, in this case (as shown by Figure 5 Along a section extending in the vehicle height direction or in the vehicle transverse direction in the region of the vehicle center (shown in a partial and perspective sectional view), an accident-induced backward displacement of the electric refrigerant compressor 16 occurs, for example, which thereby strikes the protective element 21 .

[0043] Combination Figure 4 The lower diagram and especially Figure 5 , it can be seen that the protective element 21 ensures that the protective element does not cause significant intrusion in the region of the end 12 protruding forward in the longitudinal direction of the vehicle relative to the cross member 5 or the vehicle floor 2 or in the region of the bulge 9 of the storage housing 11, which intrusion could, for example, cause thermal events or excessive damage to the interface region 20 of the accumulator 10. More precisely, in particular, the double shell structure of the protective element 21, which consists of a metal part 22 and a plastic part 23, ensures that on the one hand the component (in the present case, the refrigerant compressor 16) is protected from excessive intrusion and on the other hand the load is reduced and deformations are thus reduced. In this case, the protection against component intrusion or the load distribution function of the protective element 21 is additionally improved by the positive support and non-positive connection of the protective element 21.

[0044] Similar to Figure 4 , Figure 6 Again, two details of the motor vehicle are shown in plan views in the region of the vehicle front part 3 or in the region of the transition to the vehicle floor 2 before and after a frontal collision with an obstacle 27 with a small overlap (offset crash).

[0045] FIG. 2 shows a perspective top view of a detail of a motor vehicle in the region of the protective element 21 after a frontal collision. Figure 7It can be seen that even during such an accident, the protective element 25 ensures that the storage housing 11 of the accumulator 10 is prevented from excessive deformation in the region of the central trough 8 or the bulge 9, for example due to an accident-induced backward displacement of the refrigerant compressor 16 or of the cross member 17 of the front axle carrier 15, and furthermore distributes the loads introduced by the collision of these components or of the cross member and thereby reduces deformations. Figure 7 Also visible is a shorter adapter piece 32 for connecting the front axle carrier to the storage housing 11 of the energy storage device 10 .

[0046] Reference numerals list

[0047] 1 Motor vehicle body

[0048] 2 Vehicle Floor

[0049] 3 Front of vehicle

[0050] 4 Side extensions

[0051] 5 Beam

[0052] 6 Floor Parts

[0053] 7 end wall

[0054] 8 Middle bottom groove

[0055] 9. Bump

[0056] 10 Accumulator

[0057] 11 Memory housing

[0058] 12 ends

[0059] 13 Main longitudinal beam

[0060] 14 Beam

[0061] 15 Front axle bracket

[0062] 16 Refrigerant compressor

[0063] 17 Beam

[0064] 18 Upper part

[0065] 19 Lower part

[0066] 20 Interface area

[0067] 21 Protection components

[0068] 22 Metal parts

[0069] 23 Plastic parts

[0070] 24 Connecting elements

[0071] 25 Threaded connection elements

[0072] 26 columns

[0073] 27 Obstacles

[0074] 28 Energy absorbing element

[0075] 29 blank space

[0076] 30 Holding device

[0077] 31 Corner element

[0078] 32 Adapter

[0079] T Separation plane

Claims

1. An energy storage floor system for an electrically driven motor vehicle, comprising a storage housing (11) arranged below a vehicle floor (2) and having an interface region (20), the storage housing adjoining the front end (12) of the motor vehicle at a front part (3) of the motor vehicle, characterized in that: A protective element (21) is arranged at the front end (12) outside a storage housing (11) of the energy storage device (10) in order to prevent excessive penetration caused by accidents.

2. The accumulator-floor system according to claim 1, characterized in that The front end (12) of the storage housing (11) of the energy storage device (10) and the protective element (21) protrude forward in the longitudinal direction of the vehicle relative to the vehicle floor (2) in the direction of the vehicle front (3).

3. The accumulator-floor system according to claim 1 or 2, characterized in that: The protective element (21) is arranged in a central region of a storage housing (11) of the energy storage device (10) with respect to the transverse direction of the vehicle.

4. The accumulator-floor system according to claim 3, characterized in that The energy storage device (10) has a projection (9) in the region of a central tunnel (8) of the vehicle floor (2), which projection is covered by the protective element (21).

5. Energy storage device-floor system according to one of the preceding claims, characterized in that The protective element (21) is formed by an outer metal part (22), in particular a formed sheet metal part, and by an energy-absorbing plastic part (23) arranged on the inner side of the metal part.

6. The accumulator-floor system according to claim 5, characterized in that The outer metal component (22) and the energy-absorbing plastic component (23) arranged on the inner side of the metal component are manufactured separately and connected to each other via a connecting element (24).

7. Energy storage device-floor system according to one of the preceding claims, characterized in that An interface region (20) of the energy store (10) is covered by the protective element (21).

8. The energy accumulator floor system according to one of the preceding claims, characterized in that The protective element (21) is connected to the storage housing (11) of the energy storage device (10) in a non-positive and / or positive manner.

9. Energy storage device-floor system according to one of the preceding claims, characterized in that The storage housing (11) is formed by an upper part (18) and a lower part (19) which are connected to one another in the region of a separating plane (T), wherein the protective element (21) is connected only to the lower part (19).

10. The energy accumulator floor system according to one of the preceding claims, characterized in that The protective element (21) is arranged at a front end (12) of a storage housing (11) of the energy store (10) in the region of a recess (29) of a corresponding energy-absorbing profile.

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