Underfloor system for storing an energy storage device in a vehicle and vehicle with the underfloor system

Abstract

The technology disclosed herein relates to an underbody system (10) for storing an energy storage device (50) in a vehicle (100), comprising an underbody support structure (90), an upper roof sheet structure (20) with a flat roof section (21) for attaching the roof sheet structure (20) to the underbody support structure (90) and a roof projection section (22), a lower floor sheet structure (30), and an elastic roof padding element (23) positioned on the roof projection section (22) and spaced apart from the roof section (21), and / or an elastic floor padding element (33) positioned on the floor sheet structure (30), wherein a storage volume (60) for storing the energy storage device (50) on the roof padding element (23) and / or on the floor sheet structure (30) is located between the roof sheet structure (20) and the floor sheet structure (30). The floor cushioning material (33) is formed. The disclosed technology further relates to a vehicle (100) with an underbody system (10).

Description

[0001] The technology disclosed herein relates to an underfloor system for storing an energy storage device in a vehicle and to a vehicle with such an underfloor system.

[0002] Fuel cell systems for mobile applications such as motor vehicles are known from the prior art. Motor vehicles with a fuel cell system typically include at least one energy storage device, for example, a high-pressure fuel tank, which supplies the fuel cell system for power generation. Many different concepts exist for the storage and / or mounting of these high-pressure tanks, which differ considerably in terms of mounting method and location. Examples include magnetic mounting concepts, underbody mounting concepts, trunk mounting concepts, engine compartment mounting concepts, and rear compartment mounting concepts. Known high-pressure tanks are often mounted using tension straps or so-called neck-mount systems. Such systems can be complex to install and / or assemble.When high-pressure tanks are mounted in the vehicle's underbody, floor panel stiffeners are typically used to counteract loads from occupants, vibrations during driving, and noise transmission into the vehicle's interior. For mounting concepts for high-voltage storage systems or traction batteries, floor panel stiffeners are typically implemented using so-called surface pads. These pads, positioned over a high-voltage storage system cover, apply mechanical stress to the floor panel above it when the system is installed. For acoustic optimization, floor panels are often constructed using a sandwich design, incorporating an acoustically effective coating between two layers of metal.

[0003] The object of the present invention is to create an improved storage system for energy storage devices such as high-pressure tanks and / or high-voltage storage devices in a vehicle.

[0004] The aforementioned problem is solved by the patent claims. In particular, the aforementioned problem is solved by the underbody system according to claim 1 and the vehicle according to the dependent claim. Further advantages of the technology will become apparent from the dependent claims, the description, and the figures. Features described in connection with the underbody system also apply in connection with the vehicle, and vice versa, so that the disclosure regarding the individual aspects always refers to and / or can refer to each other.

[0005] According to a first aspect of the present technology, an underbody system for housing an energy storage device in a vehicle is proposed. The underbody system comprises an underbody support structure, an upper roof sheet structure including a flat roof section for attaching the roof sheet structure to the underbody support structure and a roof overhang section, and a lower floor sheet structure. The underbody system also includes an elastic roof pad positioned at the roof overhang section and spaced apart from the roof section, and / or an elastic floor pad positioned at the bottom sheet structure. A storage volume for housing the energy storage device is formed between the roof sheet structure and the floor sheet structure.

[0006] Within the framework of the present technology, it was recognized that the previously conventional and separately designed floor panel can be dispensed with if it is designed as the flat roof section of the roof sheet structure. That is, according to the proposed technology, a floor section, including the desired stiffness, for example in a footwell area, can be achieved by the roof section of the roof sheet structure. The underbody support structure can be understood as a structure in which individual beams extend parallel to each other, perpendicular to each other, and / or overlap. These beams can include, for example, seat crossbeams. The roof section can be understood as an upper wall section and / or an upper wall structure of the roof sheet structure, which, when the underbody system is used in the vehicle, is designed above the roof overhang section when viewed in the direction of gravity.The underbody support structure can be configured to stabilize the underbody of a passenger compartment of the vehicle.

[0007] The term "flat roof section" can be understood to mean that the roof section extends predominantly, completely, or almost completely straight and / or along a straight plane, particularly a flat surface. In this way, the roof section, especially when several roof sections are arranged side by side, can be used as a replacement for the floor pads typically used until now. Consequently, the Z-dimension chain in future vehicle architectures can be reduced when using the proposed underbody system. The additional closure of the underbody can be achieved via the energy storage system integrated within the underbody system.

[0008] The term "energy storage" can refer to a high-voltage storage system and / or a fuel storage system. A high-voltage storage system can include a battery storage system, a drive battery, and / or a traction battery for the vehicle. A fuel storage system can refer specifically to fuel tanks and / or high-pressure storage systems for gaseous fuels such as hydrogen and natural gas. The underbody system is generally considered without any stored and / or installed energy storage system, but it may also include one.

[0009] The proposed underfloor system can be configured to house at least one energy storage device. The underfloor system can further be configured to house multiple energy storage devices, and in particular, multiple high-pressure tanks and / or high-voltage storage devices positioned side by side in a row. The underfloor system is preferably configured to house the at least one energy storage device in an underfloor area beneath a passenger compartment of the vehicle.

[0010] By positioning the roof padding element at a distance from the roof overhang, acoustic decoupling of the energy storage system from the vehicle interior is also possible. In particular, this acoustic decoupling can be achieved simply, saving space and material.

[0011] The roof sheet metal structure can have a first curvature section in a transition area between the roof section and the roof overhang section, in which the roof sheet metal structure exhibits a curvature of more than 80°, in particular a curvature of 90°. The roof overhang section can then extend orthogonally to the roof section and subsequently be curved in a second curvature section of the roof overhang section in a range between 10° and 90°, or in a range between 20° and 70°, or in a range between 40° and 50°, for example by approximately 45°, towards the roof section or an underside of the roof section. The term "roof overhang section" can be understood to refer to at least one roof overhang section.

[0012] This means that the roof sheet structure can have one or more roof overhang sections. The roof section can have a top and a bottom, with the top of the roof section configured to attach the roof sheet structure to the underbody support structure and / or to directly contact a bottom of the underbody support structure, and with the roof overhang section extending away from the bottom of the roof section.

[0013] The base sheet metal structure is preferably provided separately from the roof sheet metal structure and / or spaced apart from the roof sheet metal structure. The storage volume can be designed such that at least one cylindrical energy storage device, and in particular several cylindrical energy storage devices positioned side by side, can be stored within it.

[0014] The elastic roof padding can contain or be made of a foam that effectively absorbs shocks and vibrations within the vehicle and / or in the area of ​​the vehicle's underbody. Foams are lightweight, flexible, and easily molded into various shapes and sizes. Furthermore, foams can provide the desired temperature insulation for the energy storage system. The padding materials proposed within the scope of this technology can contain or be made of EPDM foam.

[0015] According to a further embodiment of the present technology, the roof sheet metal structure can be monolithic and / or manufactured in one piece. This allows for a particularly stable and compact underbody system. Furthermore, a monolithic roof sheet metal structure can be manufactured quickly and easily. The roof sheet metal structure can therefore be designed as a curved, one-piece sheet metal profile. In an area where an edge of the roof overhang section contacts the underside of the flat roof section, the roof overhang section can be connected to the roof section, for example, by a material bond. In other words, the roof overhang section can be designed as an outer part of an original roof sheet metal structure, which is bent towards the underside of the roof section and connected in an edge area or...The contact section, where the edge area contacts the underside of the roof section, is attached to the underside, particularly by a material bond. This allows the desired stability to be achieved in the roof sheet metal structure in a simple and space-saving manner. By attaching the edge area of ​​the roof overhang section to the underside of the roof section, both the roof section and the roof overhang section can be easily stabilized.

[0016] Furthermore, with an underbody system based on the present technology, it is possible for the roof sheet structure to be attached to a flat counter-attachment section of the underbody support structure via a flat roof mounting section. Thus, the roof sheet structure can be attached to the underbody support structure at various points, for example, by bolting, welding, and / or bonding. This allows for a relatively small Z-dimension chain and / or a relatively low overall height of the underbody system to be achieved easily.

[0017] Furthermore, in an underbody system according to the present technology, the roof sheet structure may have a C-shaped and / or a U-shaped cross-section. Such a shape provides a sufficiently large contact and fastening surface for attaching the roof sheet structure to the underbody support structure and for forming part of the underbody, while simultaneously creating an advantageous form for housing the energy storage unit. The C-shape and / or the U-shape are to be understood as each having a straight roof section and two projecting sections. The projecting sections may each have an undercut. The roof sheet structure is preferably designed to be symmetrical or substantially symmetrical.

[0018] An underfloor system according to the present technology can have several adjacent roof sheet structures and several adjacent floor sheet structures for supporting several parallel energy storage devices, wherein the floor sheet structures each have a floor section and a floor projection section, wherein the floor projection section has a first floor support section and a second floor support section, and wherein the floor cushioning means has two spaced-apart floor cushioning means.wherein a first floor cushioning element is positioned at the first floor support section to cushion a first energy storage unit in a first storage volume, and a second floor cushioning element is positioned at the second floor support section to cushion a second energy storage unit in a second storage volume, and wherein the floor projection section extends longitudinally between and parallel to the first energy storage unit and the second energy storage unit. In simplified terms, the roof sheet metal structures and the floor sheet metal structures can be arranged offset from one another, so that each energy storage unit in a storage volume is supported by a roof sheet metal structure and two adjacent floor sheet metal structures and / or the respective cushioning elements. Furthermore, each floor sheet metal structure supports two energy storage units. This offset positioning allows for high stability in the subfloor system with minimal material expenditure. Furthermore, it is possible tothat each floor sheet structure has at least two floor support sections on both end, outer and / or end faces of the floor sheet structure with reference to a longitudinal direction of the floor sheet structure. That is, each floor sheet structure can have several floor support sections with, for example, four or more spaced-apart floor cushioning elements.

[0019] Furthermore, in an underbody system based on the present technology, the floor projection section can have a saddle-shaped cross-section. This allows the desired bearing and stabilizing function to be implemented particularly easily and with minimal material usage. Additionally, the floor padding elements can be attached to the floor sheet structure with particular ease. The term "saddle-shaped cross-section" for the floor projection section can be understood to mean that at least a portion, and especially a central portion, of the floor projection section has a saddle-shaped and / or V-shaped cross-section. Two straight floor sections can adjoin the saddle-shaped and / or V-shaped cross-section; these are positioned parallel to the roof section and can be configured to fasten the floor sheet structure within the vehicle.The roof sides of the floor projection section can be designed with an angle to each other in a range between 50° and 120°, for example approximately 90°.

[0020] According to a further embodiment of the present technology, the roof overhang section of an underbody system may have a first roof support section and a second roof support section. The roof padding element comprises two spaced-apart roof padding elements. A first roof padding element for padding an energy storage device within the storage volume is positioned on the first roof support section, and a second roof padding element for padding the same energy storage device within the same storage volume is positioned on the second roof support section. The at least two support points allow the energy storage device to be mounted particularly stably within the storage volume and reliably protected from vibrations in the vehicle. Furthermore, it is possible for each roof sheet structure to have two roof support sections on both end, outer, and / or front faces of the roof sheet structure, oriented along a longitudinal direction.This means that each roof sheet metal structure can have multiple roof support sections with four or more spaced-apart roof padding centers. The roof support sections can each be oriented obliquely to one another such that a projection of the roof support sections and / or a normal vector of the roof support sections intersect in their respective extensions, for example at an angle in a range between 50° and 120°, in particular approximately 90°.

[0021] Furthermore, in an underbody system according to the present technology, it is possible for the roof padding element to be attached to the roof overhang section by a form-fit and / or force-fit connection, and / or for the floor padding element to be attached to the floor overhang section by a form-fit and / or force-fit connection. The roof padding element and / or the floor padding element are specifically not bonded to the material. The form-fit and / or force-fit connection of the padding elements makes it possible not only to attach the padding elements quickly and easily to the desired position, but also to replace them relatively quickly and easily in case of damage and / or wear. A snap-fit, clip, and / or clamping mechanism can be used for the form-fit and / or force-fit attachment of the roof padding element and / or the floor padding element. On the end faces of the respective sheet metal structure or...The respective storage section can, for example, be designed with slot-shaped openings. The cushioning material can be inserted into these slot-shaped openings in such a way that the cushioning material protrudes into the storage volume on one side of the storage section, while a fastening element for securing the cushioning material by force and / or form-fit protrudes away from the storage volume on the other side of the storage section.Each roof padding element can project from a front side of the respective roof storage section, and each floor padding element can project from a front side of the respective floor storage section into and / or towards the storage volume, wherein a fastening element connected or connectable to the respective roof padding element is provided on the rear side of each roof storage section for attaching the roof padding element to the roof storage section, and / or a fastening element connected or connectable to the respective floor padding element is provided on the rear side of each floor storage section for attaching the floor padding element to the floor storage section. The fastening elements can each include a rotary mechanism for attaching the respective padding element to the storage section by turning and / or screwing the fastening element.The fastening mechanism allows for easy yet secure installation of the roof and floor cushions. Furthermore, the roof and floor cushions can generally be attached to the desired location without tools.

[0022] A subfloor system according to the present technology can further comprise a connecting element that establishes a mechanical connection between the roof sheet metal structure and the floor sheet metal structure, wherein the connecting element is attached to the underside of the roof section facing the storage volume. The connecting element allows the roof sheet metal structure and the floor sheet metal structure, including any energy storage element positioned within the storage volume, to be held together and attached to the subfloor support structure, without requiring any fastening structure projecting beyond the top of the roof section. In this way, the subfloor system can be designed to be particularly flat or have a particularly low overall height.The fact that the fastener creates a mechanical connection between the roof sheet metal structure and the floor sheet metal structure can be understood to mean that the fastener is configured to brace the roof sheet metal structure to the floor sheet metal structure. The fastener and / or a roof connection section of the fastener can be bonded to the underside. The fastener and / or the roof connection section can be welded and / or bonded to the underside, for example. The fastener can have a one-piece and / or monolithic main body that is bonded to the underside of the roof section and connected to the floor sheet metal structure directly or indirectly, i.e., via another fastener, by force-fit and / or form-fit, for example, by bolting.The main body can be attached to a base plate, to which the base plate structure is bonded, for example, by means of force-fit and / or form-fit. The main body can be designed in the form of sheet metal and / or plates, or essentially in the form of sheet metal and / or plates. The main body can be made of plastic and / or metal. Several main bodies, for example, more than four or more than ten, can extend from the roof plate structure towards the base plate structure between the energy storage units.

[0023] Another aspect of the present technology concerns a vehicle with an underbody system as described in detail above and at least one electric motor for propelling the vehicle. This gives the vehicle the same advantages as described in detail with regard to the underbody system. The underbody system can include an energy storage device, as described above, within its storage volume, which provides the energy used to generate electricity for the at least one electric motor. If a high-voltage battery is used as the energy storage device, it can directly provide the electricity for the at least one electric motor. If at least one fuel tank is used as the energy storage device, it can provide the fuel for the fuel cell or fuel cell stack, in which the electricity for the at least one electric motor is generated.The term "energy storage system" can also refer to a combination of a fuel tank as the fuel source for a fuel cell stack and a high-voltage battery as a buffer for the electricity generated by the fuel cell stack and for rapid energy release. The term "vehicle" can refer to a motor vehicle such as a motorized two-wheeler, a passenger car, or a truck. It can also refer to a road vehicle, an aircraft, a watercraft, a rail vehicle, a spacecraft, or a robot. Furthermore, the term "vehicle" can include a purely electric vehicle and a hybrid electric vehicle, which, in addition to at least one electric motor, has an internal combustion engine for propulsion.

[0024] Further measures improving the technology result from the following description of various embodiments of the technology, which are schematically illustrated in the figures. All features and / or advantages arising from the claims, the description, or the figures, including design details and spatial arrangements, can be significant both individually and in various combinations.

[0025] They each show schematically: Fig. 1 a subfloor system according to an embodiment of the present technology in a first sectional view, Fig. 2 the in Fig. 1 Subfloor system shown in a first perspective view, Fig. 3 a roof sheet metal structure of the in Fig. 1 underbody system shown, Fig. 4 a floor sheet metal structure of the in Fig. 1 underbody system shown, Fig. 5 that in Fig. 1. Subfloor system shown in a second sectional view, Fig. 6 the in Fig. 1. Subfloor system shown in a second perspective view, Fig. 7 that in Fig. 1 Underbody system shown in a disassembled state, Fig. 8 that in Fig. 1 Underbody system shown in an assembled state, and Fig. 9 a vehicle with the in the Fig. Underbody system shown in figures 1 to 8.

[0026] Elements with the same function and mode of operation are each provided with the same reference symbols in the figures.

[0027] Fig. Figure 1 shows a sectional view of part of an underbody system 10 for housing an energy storage device 50. The underbody system 10 has an underbody support structure 90, which is part of a body of a vehicle in Fig. The underbody system 10 can be understood as shown in Figure 9 of the vehicle 100. The underbody system 10 further comprises an upper roof sheet structure 20, or several such roof sheet structures 20, each with a flat roof section 21, via which the roof sheet structures 20 are each attached to the underbody support structure 90 (not shown in detail). More precisely, the roof sheet structure 20 is attached to a flat counter-attachment section 91 of the underbody support structure 90 by a flat roof attachment section 24 of the roof section 21. In other words, an upper surface of the roof sheet structure 20 is attached to a lower surface of the underbody support structure 90. The roof sheet structures 20 also each have a roof projection section 22. Elastic roof padding elements 23 are positioned on the roof projection section 22, spaced apart from the roof section 21. The roof cushioning elements 23 are designed to be spaced apart from each other.

[0028] The subfloor system 10 shown also has a lower floor sheet structure 30 or several such floor sheet structures 30, each with a floor section 31 and a floor projection section 32. Elastic floor padding elements 33 are positioned on the floor sheet structure 30 or on the floor projection section 32, spaced apart from the floor section 31. The floor padding elements 33 are spaced apart from each other.

[0029] The roof sheet metal structures 20 and the floor sheet metal structures 30 are each monolithic, designed as bent sheet metal pieces. The roof sheet metal structure 20 shown has a C-shaped or U-shaped cross-section. The floor projection section 32 has a gable roof-shaped cross-section.

[0030] A storage volume 60 is formed between the roof sheet metal structure 20 and the floor sheet metal structure 30, in which an energy storage unit 50 is positioned. In the example shown, the energy storage unit 50 has several fuel tanks positioned next to each other. Alternatively, one or more high-voltage batteries could also be positioned in the storage volume 60 as an energy source for the electric motors 110 of the vehicle 100. The fuel tanks are mounted in the storage volume 60 between the roof padding elements 23 and the floor padding elements 33.

[0031] As in Fig. As can be seen from Figure 1, each floor projection section 32 has a first floor support section 35 and a second floor support section 36, or several different floor support sections 35, 36, wherein several spaced-apart floor cushioning means 33 are located on the first floor support section 35 (see Figure 1). Fig. 7) are positioned to cushion a first fuel tank in a first storage volume 60 and several spaced-apart floor cushioning means 33 are located at the second floor storage section 36 (see Fig. 7) are positioned to cushion a second fuel tank in a second storage volume 60. Furthermore, each roof overhang section 22 has a first roof support section 25 and a second roof support section 26, or several different roof support sections 25, 26, wherein several spaced-apart roof cushioning elements 23 are attached to the first roof support section 25 and several further spaced-apart roof cushioning elements 23 are attached to the second roof support section 26 (see Fig. 7) The first roof cushioning elements 23 and the second roof cushioning elements 23 are positioned to cushion the same energy storage unit 50 in the same storage volume 60.

[0032] Furthermore, with regard to Fig. 1. It can be seen that the roof padding elements 23 are attached to the roof overhang section 22 in a force-fit and form-fit manner, and that the floor padding elements 33 are attached to the floor overhang section 32 in a force-fit and form-fit manner. More precisely, there are slot-shaped openings, or roof slot openings 27 and floor slot openings 37, on the end faces of the roof overhang sections 22 and the floor overhang sections 32 (see Figure 1). Fig. 3 and Fig. 4) designed. The roof padding elements 23 and the floor padding elements 33 are each inserted into the slot openings 27, 37 such that the respective padding element 23, 33 projects into the storage volume 60 on one side of the respective storage section and a fastening element 40 for fastening the respective padding element 23, 33 projects away from the storage volume 60 on another side of the storage section.Each roof padding element 23 can project from a front side of the respective roof storage section 25, 26, and each floor padding element 33 can project from a front side of the respective floor storage section 35, 36 into the storage volume 60 and / or in the direction of the storage volume 60, wherein a fastening element 40 connected to the respective roof padding element 23 is provided on the rear side of each respective roof storage section 25, 26 for fastening the roof padding element 23 to the roof storage section 25, 26, and a fastening element 40 connected to the respective floor padding element 33 is provided on each rear side of each respective floor storage section 35, 36 for fastening the floor padding element 33 to the floor storage section 35, 36. The fastening means 40 each have a screw mechanism for attaching the respective cushioning means 23, 33 to the bearing section by turning or screwing the fastening means 40.Furthermore, the roof padding elements 23 and the floor padding elements 33 can generally be attached to the desired location without tools. In central or middle areas of the sheet metal structures, the fasteners 40 can, for example, be positioned at the desired location via through-holes and then fastened. Fig. 2 shows a perspective view of the in Fig. 1 shown underbody system 10.

[0033] Fig. Figure 3 shows a cross-sectional view of a single roof sheet metal structure 20. In Fig. Figure 3 shows that in an area where an edge region of the roof overhang section 22 contacts the underside of the flat roof section 21, the roof overhang section 22 is bonded to the roof section 21. In other words, the roof overhang section 22 is designed as an outer part of an original roof sheet structure 20, which is bent towards the underside of the roof section 21 and bonded to the underside in an edge region or contact section where the edge region contacts the underside of the roof section 21. The depicted roof sheet structure 20 has a first roof support section 25 and a second roof support section 26, each of which has several roof slot openings 27, two of which are shown. In a central area of ​​the roof sheet structure 20 (in Fig. (3 not shown) the roof slot openings 27 can be designed in the form of through openings.

[0034] Fig. Figure 4 shows a cross-sectional view of a single floor sheet structure, 30 in. Fig. 4 The saddle roof shape of the floor projection section 32 can be recognized. The depicted floor sheet structure 30 has a first floor support section 35 and a second floor support section 36, each of which has several floor slot openings 37, of which in Fig. 4 Two floor slot openings 37 are shown. In a central area of ​​the floor sheet structure 30 (in Fig. (4 not shown) the floor slot openings 37 can be designed in the form of through openings.

[0035] In Fig. Figure 5 shows the subfloor system 10 in a further sectional view. As in Fig. As shown in Figure 5, the underfloor system 10 has a sheet-like connector 41 that provides a mechanical connection between the roof sheet structure 20 and the floor sheet structure 30, the connector 41 being attached to a roof underside 28 of the roof section 21 facing the storage volume 60. More precisely, the connector 41 is bonded to the roof underside 28 at one end section. At another end section, the connector 41 is screwed to a floor sheet 42. The floor sheet 42 is bonded to the floor sheet structure 30. Fig. Figure 6 shows the connecting element 41 in a perspective sectional view of the subfloor system 10.

[0036] Fig. Figure 7 shows the underbody system 10 in an overall view, in which roof sheet metal structures 20, connecting elements 41, the energy storage system 50 in the form of several fuel tanks, and floor sheet metal structures 30 are shown in a disassembled state or in an exploded view. As in Fig. As can be seen in Figure 7, the underbody system 10 has several roof sheet metal structures 20 extending parallel to each other in the longitudinal direction L and several floor sheet metal structures 30 extending parallel to each other in the longitudinal direction L for storing several fuel tanks arranged next to each other. With regard to Fig. 7 can also be seen that the floor projection sections 32 extend in a longitudinal direction L between and parallel to the fuel tanks. Fig. Figure 8 shows the underbody system 10 in an assembled state.

[0037] In Fig. 9 is a vehicle 100 with an underbody system 10 as described in detail above. The in Fig. The vehicle 100 shown in Figure 9 has two electric motors 110 for propelling the vehicle 100. Several fuel tanks of an energy storage system 50 are arranged in the underbody system 10, which supply fuel for a fuel cell system 120 of the vehicle 100. The underbody system 10 is attached to an underbody support structure 90 of the vehicle 100. The underbody system 10 can be considered a component of the fuel cell system 120.

[0038] The technology disclosed here allows for further design principles in addition to those illustrated. That is to say, the technology should not be considered limited to the embodiments explained with reference to the figures. Reference symbol list 10 Underbody system 20 Roof sheet metal structure 21 Roof section 22 Roof overhang section 23 Roof cushioning materials 24 Roof fastening section 25 first roof storage section 26 second roof storage section 27 Roof slot opening 28 Underside of roof 30 Floor sheet metal structure 31 Floor section 32 Ground Protrusion Section 33 Floor cushioning agents 35 first ground storage section 36 second floor storage section 37 Floor slot opening 40 Fasteners 41 Fasteners 42 Floor plate 50 energy storage units 60 storage volume 90 Subfloor support structure 91 Counter-fortification section 100 vehicles 110 electric motor 120 fuel cell systems L Longitudinal direction

Claims

[1] Underbody system (10) for supporting an energy storage device (50) in a vehicle (100), comprising: - an underbody support structure (90), - an upper roof sheet structure (20) comprising a flat roof section (21) for attaching the roof sheet structure (20) to the underbody support structure (90) and a roof projection section (22), - a lower floor sheet metal structure (30) and - an elastic roof cushioning means (23) positioned on the roof projection section (22) and spaced from the roof section (21) and / or an elastic floor cushioning means (33) positioned on the floor sheet structure (30), - wherein a storage volume (60) for storing the energy storage device (50) on the roof cushioning means (23) and / or on the floor cushioning means (33) is formed between the roof sheet metal structure (20) and the floor sheet metal structure (30). [2] Underbody system (10) according to claim 1, characterized bythat the roof sheet structure (20) is monolithic and / or integral. [3] Underbody system (10) according to one of the preceding claims, characterized by that the roof sheet structure (20) is fastened by a flat roof fastening section (24) of the roof section (21) to a flat counter-fastening section (91) of the underbody support structure (90). [4] Underbody system (10) according to one of the preceding claims, characterized by that the roof sheet structure (20) has a C-shaped and / or U-shaped cross-section. [5] Underbody system (10) according to one of the preceding claims, characterized by - a plurality of roof sheet metal structures (20) arranged side by side and a plurality of floor sheet metal structures (30) arranged side by side for supporting a plurality of energy storage devices (50) arranged parallel to one another, - wherein the base sheet metal structures (30) each have a base section (31) and a base projection section (32), - wherein the floor projection portion (32) has a first floor support portion (35) and a second floor support portion (36), - wherein the floor cushioning means (33) comprises two floor cushioning means (33) spaced apart from one another, - wherein a first floor cushioning means for cushioning a first energy storage device (50) in a first storage volume (60) is positioned on the first floor storage section (35), and a second floor cushioning means for cushioning a second energy storage device (50) in a second storage volume (60) is positioned on the second floor storage section (36), and - wherein the bottom projection portion (32) extends in a longitudinal direction (L) between and parallel to the first energy storage device (50) and the second energy storage device (50). [6] Underbody system (10) according to claim 5, characterized by that the floor projection section (32) has a gable roof-shaped cross-section. [7] Underbody system (10) according to one of the preceding claims, characterized by in that the roof projection section (22) has a first roof support section (25) and a second roof support section (26), wherein the roof cushioning means (23) has two spaced-apart roof cushioning means (23), a first roof cushioning means for cushioning an energy storage device (50) in the underbody system (10) is positioned on the first roof support section (25), and a second roof cushioning means (23) for cushioning the same energy storage device (50) in the underbody system (10) is positioned on the second roof support section (26). [8] Underbody system (10) according to one of the preceding claims, characterized bythat the roof cushioning means (23) is fastened to the roof projection section (22) in a form-fitting and / or non-positive manner and / or the floor cushioning means (33) is fastened to the floor projection section (32) in a form-fitting and / or non-positive manner. [9] Underbody system (10) according to one of the preceding claims, characterized by a connecting means (41) which establishes a mechanical connection between the roof sheet metal structure (20) and the floor sheet metal structure (30), wherein the connecting means (41) is fastened to a roof underside (28) of the roof section (21) facing the storage volume (60). [10] Vehicle (100) with an underbody system (10) according to one of the preceding claims and at least one electric motor (110) for driving the vehicle (100).

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