Accumulator housing assembly for a motor vehicle

Abstract

The invention relates to an accumulator housing assembly for a motor vehicle (1), comprising an accumulator housing (3) and an underbody protection device (5) fixed to the accumulator housing (3) at the bottom, the underbody protection device (5) comprising a sandwich structure (10) having an upper cover plate (11) on its upper side pointing toward the accumulator housing (3) and a lower cover plate (12) on its lower side, wherein a filling material (13) is arranged between the upper cover plate (11) and the lower cover plate (12), and the upper side of the sandwich structure (10) is formed by webs or ribs (14).

Description

Technical Field

[0001] The invention relates to an accumulator housing assembly for a motor vehicle, comprising an accumulator housing and an underbody protection device / underrun protection device fixed on the underside of the accumulator housing. The invention also relates to an underbody protection device for the accumulator housing assembly and a motor vehicle. Background Art

[0002] The underbody protection device is usually a one-piece or integrally constructed component, especially made of metal or plastic, wherein in electric vehicles or hybrid vehicles, these components are usually fixed to the energy storage housing of the underfloor battery. The underbody protection device is used to protect the energy storage device or high-voltage module accommodated in the energy storage housing, especially in the event of an accident or the like, from possible mechanical loads. Therefore, firstly, in the event of damage, the energy storage device of the motor vehicle is exposed to a high risk of fire, so the energy storage device should be protected from mechanical loads and potential damage. The underbody protection device is also used in motor vehicles to prevent other traffic participants, especially other motor vehicles or pedestrians, from drilling under the motor vehicle. The underbody protection device is therefore used to avoid potential serious injuries to other traffic participants and / or to avoid damage to the motor vehicle. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an improved solution for an underbody protection device, in particular with respect to the improvement of the mechanical properties.

[0004] In an accumulator housing assembly of the type described at the outset, this technical problem is solved in the following manner, namely, the bottom protection device comprises a sandwich structure, which has an upper cover plate on its upper side pointing toward the accumulator housing and a lower cover plate on its lower side, wherein a filling material is arranged between the upper cover plate and the lower cover plate, and the upper side of the sandwich structure is molded with webs or ribs or the outer contour is formed by webs or ribs.

[0005] The accumulator housing usually has a base plate or housing bottom, to which preferably four side walls of the accumulator housing are connected, which side walls are usually perpendicular to the base plate and can be fixed to the base plate by screws or other suitable fasteners. The accumulator housing is preferably closed at the top by a housing cover, which, like the base plate, is preferably screwed to the side walls. An accumulator or battery is accommodated inside the accumulator housing, which stores electrical energy for driving a motor vehicle, in particular in the form of an electric or hybrid vehicle.

[0006] The underbody protection device is designed in at least three layers, wherein a filler material is provided between an upper cover plate and a lower cover plate, which preferably each delimit the underbody protection device to the outside. The webs or ribs form a substantially reinforced elongated region of the underbody protection device, thereby ultimately increasing the flexural rigidity of the underbody protection device. This optimization of the topology of the underbody protection device or the energy storage housing assembly results in improved energy absorption in the event of sudden loads, in particular in the event of a collision or an accident.

[0007] Specifically, the webs or ribs can be realized by a corresponding geometry of the upper cover plate, wherein this shape and the geometry of the filling material can be matched to one another. Thus, the upper cover plate can have, at least in some places, for example, elongated or groove-shaped protrusions, which face the accumulator housing or, more precisely, the bottom plate of the accumulator housing and form webs or ribs. The lower cover plate is preferably designed to be flat in order to optimize the aerodynamic properties of the accumulator housing assembly or the associated motor vehicle, in particular to reduce the c W value.

[0008] The upper cover plate is particularly preferably, also aspect the tab or rib, set to an integral workpiece. In addition, the sandwich structure comprising the upper cover plate, the filling material and the lower cover plate can be set to a series component, that is to say, this component can be manufactured in a single step by a correspondingly shaped mould.

[0009] In the accumulator housing assembly according to the invention, it can be provided that the underbody protection device is fixed in the region of the webs or ribs to at least one reinforcement element and / or to at least one side wall of the accumulator housing, the at least one reinforcement element being arranged inside the accumulator housing and being provided to increase the mechanical stability of the accumulator housing. The topology of the accumulator housing and the topology of the underbody protection device can thus be matched to one another in such a way that the underbody protection device is better supported on the supporting structure of the accumulator housing.

[0010] Thus, in the event of a crash or generally in the event of a force loading of the underbody protection, the forces acting therein are transmitted as directly as possible and thus effectively by the underbody protection to the reinforcement element of the accumulator housing, which results in an optimized energy absorption of the accumulator housing assembly. This advantageous force transmission is also achieved in this case when the webs or ribs of the underbody protection are fastened to the side walls of the accumulator housing. Thus, the structure that is already present in any case is operatively connected to the underbody protection, so that an improvement in the mechanical properties of the accumulator housing assembly is achieved in a synergistic manner.

[0011] At least one reinforcement element can be a support element of the accumulator housing, which extends at least partially along the bottom plate of the accumulator housing, in particular between two opposite side walls of the accumulator housing. The support element, which can be, for example, a longitudinal support element and / or a transverse support element, serves to increase the strength of the accumulator housing and thus protect the accumulator accommodated in the housing from mechanical loads and possible damage caused thereby in the event of a collision or accident.

[0012] Preferably, the support element extends over the entire height of the accumulator housing, i.e. from the base plate to the housing cover, and is fixed to the base plate and the housing cover. Furthermore, the support element preferably extends completely between two opposite side walls of the accumulator housing and is optionally also fixed to the side walls. The support element can have a rectangular cross section with a solid or hollow profile. Furthermore, the support element can be made of metal, in particular steel or aluminum, alternatively also of plastic or other suitable materials. Preferably, a plurality of support elements are provided, which form a rectangular or cuboid receiving area for the accumulator to be received in the accumulator housing.

[0013] Each tab or each rib can be fixed to a different support of the accumulator housing. Preferably, when the support and the tab or rib are fixed to each other, the longitudinal axis of the tab or rib extends substantially parallel to the longitudinal axis of the support.

[0014] In the accumulator housing assembly according to the invention, it can be provided that a plurality of screws, sleeves and / or rivets penetrate the sandwich structure and the bottom plate of the accumulator housing and are fixed to the support. In this case, the support can have holes with corresponding threads, into which the screws engage in the fixed state. The bottom protection device can thus ultimately be fixed to the support only by means of screws, sleeves and / or rivets. In this case, the lower cover plate can have counterbores for accommodating the heads of the screws and / or rivets.

[0015] It is preferably proposed that at least one cooling device in thermal contact with at least one accumulator accommodated in the accumulator housing is provided between the underbody protection device and the accumulator housing, the at least one cooling device in particular comprising at least one cooling plate. Typically, the accumulator generates heat that must be discharged, in particular during charging operation or driving operation of the motor vehicle. For this purpose, the cooling device can be in thermal contact with a bottom plate of the accumulator housing, wherein the bottom plate is usually made of metal and therefore has good thermal conductivity, wherein the bottom plate in turn can be in thermal contact with the accumulator. In addition, by means of the underbody protection device of the accumulator housing assembly according to the invention, the cooling device (like the accumulator) is protected from damage in the event of a collision, in particular leakage of cooling fluid that could be harmful to the environment should be avoided.

[0016] The cooling device can be arranged spaced apart from the bottom protection device or the upper cover plate of the bottom protection device, wherein a heat-insulating air cushion is preferably constructed between these components. As a result, the cooling power provided by the cooling device is not unnecessarily output to the outside through the bottom protection device, especially when the external temperature is high. In order to fix the cooling plate to the accumulator housing, for example, a threaded connection or a similar connection can be provided. Here, as long as the sandwich structure between the webs or ribs has a constant height, the spacing between the cooling plate and the sandwich structure can also be constant. Alternatively, the sandwich structure can be bent in the area between every two webs or ribs, that is, it has a bridge-like structure in the cross-sectional view.

[0017] The cooling device, in particular at least one cooling plate, is preferably part of a cooling circuit or a cooling system in which a cooling fluid circulates. For this purpose, the cooling device can be connected to cooling lines that carry the cooling fluid, wherein the underbody protection device can have corresponding openings for the cooling lines to pass through. The cooling lines preferably extend parallel to the underbody protection device or the sandwich structure.

[0018] The sandwich structure can have at least two webs or ribs, wherein the cooling device is arranged between the two webs or ribs and extends over at least half, preferably two thirds, of the spacing between the webs or ribs. In this case, the free structural space that is actually present between the two webs or ribs is used particularly effectively. In addition, the cooling device or cooling plate should be in thermal contact with the largest possible surface of the energy storage housing in order to ensure the most effective possible heat conduction / heat flow between the energy storage and the cooling device. In the case where more than two webs or ribs are provided, it is preferred that a cooling device can be arranged between two adjacent webs or ribs.

[0019] Furthermore, it can be provided for the accumulator housing assembly according to the invention that the filling material is a heat-insulating material, in particular a filling foam. In this case, the filling material not only contributes to the improvement of the mechanical properties of the accumulator housing assembly, which has already been described, but also eliminates other specific measures for achieving thermal decoupling between the accumulator housing and the underbody protection device in a synergistic manner. For example, in this embodiment, a heat insulation or heat-insulating component arranged between these components and constructed as a separate component is no longer necessary. This is particularly advantageous when the outside temperature is relatively high, in which case the heat transfer from the outside via the underbody protection device to the accumulator housing should be kept as small as possible.

[0020] The filling material can be, for example, plastic, in particular polyethylene terephthalate (PET), polyurethane (PUR) or polymethacrylimide (PMI). The filling material can be a solidified component or provided as a plate-like element. The plate-like element can be provided with a local transition compression portion. The transition compression is formed by stamping the tool used to produce the filler material, thereby realizing, for example, a recess in the filler material for the screw head of a cooling plate or the like.

[0021] The upper cover plate and the lower cover plate can be made of plastic and / or fiber-reinforced. Compared with metal materials, for example, plastic has a lower density, which enables a lighter configuration of the accumulator housing assembly. By fiber reinforcement, the accumulator housing assembly can be further strengthened mechanically.

[0022] Plastics can be provided as materials for the upper and / or lower cover. In the case of using thermoplastics for this purpose, the processing methods can be, for example, injection molding methods, post-injection molding of thermoplastic semi-finished products (organic sheets, etc.) or long-fiber reinforced extrusion. The upper and / or lower cover can also be made of thermosetting plastics, wherein wet pressing, injection methods, pultrusion or SMC (Sheet Molding Compound) extrusion can be provided as production methods.

[0023] The fibers can be, for example, glass fibers, carbon fibers or natural fibers. The fibers can be provided as a textile semi-finished product, in particular a muslin, a woven fabric, a nonwoven fabric, or in the form of a sheet-like shaped plastic. The fibers can be continuous or discontinuous fibers. Furthermore, the cover plate can be reinforced by flat reinforcing elements, so-called patches. Furthermore, it is conceivable that at least some of the fibers are unidirectionally oriented.

[0024] In the accumulator housing assembly, it can be arranged that the filling material is arranged between the upper cover plate and the lower cover plate only in the area of ​​the sandwich structure adjacent to the accumulator housing, while in other positions, especially in the area protruding laterally from the accumulator housing, the upper cover plate and the lower cover plate are directly in contact with each other or the sandwich structure only includes the upper cover plate or the lower cover plate. The advantageous effect of the sandwich structure, especially the improved force transmission or heat insulation, is mainly required in the contact area between the bottom protection device and the battery housing. Outside this area, for economic reasons, especially to reduce weight and save material, the filling material can be omitted, wherein in this area, the upper cover plate is preferably in direct contact with the lower cover plate and fixed to each other there. Alternatively, it is also possible to arrange only the upper cover plate or the lower cover plate in the area protruding laterally from the accumulator housing (i.e. in the area representing the continuation of the sandwich plane), wherein the respective other cover plate abuts on the plane of the respective other cover plate at the end side.

[0025] The invention also relates to an underbody protection device for an accumulator housing assembly according to the above description, wherein, corresponding to the state in which the underbody protection device is fixed to the accumulator housing, the underbody protection device comprises a sandwich structure, which has an upper cover plate on its upper side facing the accumulator housing and a lower cover plate on its lower side, wherein a filling material is arranged between the upper cover plate and the lower cover plate and the upper side of the sandwich structure is formed by webs or ribs. All advantages and features relating to the accumulator housing assembly can be applied to the underbody protection device and vice versa.

[0026] In particular, it may be provided that the filling material is a thermal insulation material, in particular a filling foam.

[0027] The upper cover plate and / or the lower cover plate can be made of plastic and / or can be fiber-reinforced.

[0028] In the underbody protection device according to the invention, it can be provided that the filling material is arranged between the upper cover plate and the lower cover plate only in the region of the sandwich structure adjacent to the accumulator housing, and in other positions, in particular in the region protruding laterally from the accumulator housing, the upper cover plate and the lower cover plate are in direct contact with each other or the sandwich structure includes only the upper cover plate or only the lower cover plate.

[0029] The invention also relates to a motor vehicle comprising an accumulator housing assembly according to the above description. All advantages and features relating to the accumulator housing assembly and the underbody protection device can be applied to the underbody protection device and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further advantages and details of the present invention are apparent from the following exemplary embodiments and from the accompanying drawings, which schematically show:

[0031] Figure 1 is a side view of a motor vehicle according to the present invention,

[0032] Figure 2 is a cross-sectional view of an accumulator housing assembly according to the present invention, and

[0033] Figure 3 is an exploded view of the sandwich structure of the underbody protection device according to the present invention. DETAILED DESCRIPTION

[0034] exist Figure 1 The motor vehicle 1 shown in FIG. 1 has an energy storage housing assembly 2, which includes an energy storage housing 3, a plurality of energy storage devices 4 accommodated in the energy storage housing 3, and an underbody protection device 5 fixed to the energy storage housing 3 on the bottom side. The energy storage devices 4 accommodated in the energy storage housing 3 are connected to a drive device 22 of the motor vehicle 1, which is implemented as an electric motor, via electrical connections. Figure 1The coordinate system shown in defines the x-axis as the vehicle longitudinal axis, the y-axis as the vehicle lateral axis, and the z-axis as the vehicle vertical axis.

[0035] Figure 2 The accumulator housing assembly 2 is shown in a sectional view, wherein the section plane extends in the yz plane. The accumulator housing 3 comprises a housing bottom 6, on which four side walls 21 extend vertically upward, i.e. in the z direction. The accumulator housing 3 is closed by a housing cover 7, for which purpose the housing cover is screwed, for example, to the side walls 21 of the accumulator housing 3 and to a plurality of reinforcing elements 9 configured as supports 8. The supports 8 are, for example, longitudinal supports extending in the longitudinal direction of the vehicle, i.e. in the x direction, extending over the entire height of the accumulator housing 3, i.e. between the housing bottom 6 and the housing cover 7 of the accumulator housing 3 and between two opposite side walls 21. Here, the carrier 8 is screwed to the housing bottom 6, the underbody protection device 5 and to the housing cover 7, which will be discussed in detail later. The supports 8 form a cuboid-shaped receiving structure for the accumulator 4, which is inserted into the receiving compartment formed here during assembly and is also screwed to the supports 8. The support element 8 ultimately increases the mechanical strength of the energy storage housing 3 .

[0036] The underbody protection device 5 has a sandwich structure 10, which has an upper cover plate 11 and a lower cover plate 12. The upper cover plate 11 is arranged on the side of the underbody protection device 5 facing the accumulator housing 3 or the housing bottom 6, i.e. the upper side. A filling material 13 is arranged between the upper cover plate 11 and the lower cover plate 12, which filling material is exemplarily configured as a heat-insulating material, in particular a filling foam. In addition, the upper side of the sandwich structure 10 has a contour formed by webs or ribs 14. The webs or ribs 14 extend, exemplarily, in the longitudinal direction of the vehicle, i.e. in the x-direction, like the support element 8. Therefore, the sandwich structure 10 has a greater height in the region of the webs or ribs 14 with respect to the z-direction than in the remaining regions. Therefore, the groove-shaped geometry of the upper cover plate 11 realizes the webs or ribs 14 of the sandwich structure 10. The lower cover plate 12 is formed as a flat plate. In Figure 3 An exploded view of the sandwich structure 10 is shown in FIG.

[0037] The underbody protection device 5 serves to protect the energy storage device 4 accommodated in the energy storage device housing 3 from mechanical loads and damage that may result therefrom, in particular under load conditions, for example in an accident. The underbody protection device 5 also serves to prevent objects from getting under the motor vehicle 1 in the event of a collision between the motor vehicle 1 and an object, in particular another motor vehicle, a pedestrian or an animal, thereby preventing serious injuries. Since the underbody protection device 5 is not designed as a single piece or in one piece, in particular as a sheet metal, as in previous systems, but instead comprises a sandwich structure 10 with webs or ribs 14, the flexural strength of the underbody protection device 5 or the energy storage device assembly 2 is increased. The optimization of the topology of the underbody protection device 5 thus enables improved energy absorption in the event of sudden load conditions, in particular in the event of a collision or an accident.

[0038] Especially from Figure 2 As can be seen in FIG. 1 , the underbody protection device 5 is fixed in the region of the webs or ribs 14 to the reinforcing element 9 designed as a support element 8. In addition, the underbody protection device 5 is provided at its two Figure 2 The lateral webs or ribs 14 (not shown) are fixed to the side walls 21 of the energy storage housing 3. The longitudinal axis of the individual webs or ribs 14 extends parallel to the longitudinal axis of the respective corresponding support element 8 or side wall 21. This results in an improved support of the underbody protection device 5 on the wall structure or support element 8 of the energy storage housing 3. The mutually matched topological structures of the underbody protection device 5 and the energy storage housing 3 therefore result in that when forces are applied to the underbody protection device 5, especially in the event of a collision, the acting forces are transmitted as effectively as possible to the structure of the reinforcement element 9. As a result, the energy released in the collision is absorbed by the energy storage component 2 as optimally as possible.

[0039] The underbody protection device 5 is fastened to the support member 8 by means of a plurality of screws 15, for example. To this end, the screws 15 penetrate the sandwich structure 10 and are fastened to the support member 8. The support member 8, which can be designed as a solid profile or a hollow profile, has for this purpose a plurality of holes, each of which is provided with a thread, into which the corresponding screws 15 engage. In addition, the sandwich structure 10, i.e. the cover plates 11, 12 and the filling material 30 as well as the bottom plate 6 also have corresponding holes or holes for the screws 15. According to the same principle as the underbody protection device 5 is fastened to the support member 8, the underbody protection device 5 is fastened to the side wall 21 of the accumulator housing 3 by means of lateral tabs or ribs 14.

[0040] The lower cover plate 12 is configured as a flat plate in its central region, and has a plurality of screw connection locations 16 arranged along the connecting pieces or ribs 14 or the support member 8 to prevent the head of the screw member 15 from protruding. These screw connection locations can be arranged as cylindrical or conical countersunk holes, for example. Therefore, the bottom protection device 5 is completely fixed to the accumulator housing 3 by the screw members 15.

[0041] Furthermore, the motor vehicle 1 according to the invention has, by way of example, a cooling system or cooling circuit in which a cooling fluid circulates, wherein a cooling device 18 is provided which includes a plurality of cooling plates 17 and through which the cooling fluid flows. Usually, the energy storage devices 4 heat up, in particular during driving operation or charging operation of the motor vehicle 1, wherein the heat generated in this case is discharged via the cooling devices 18. The cooling plates 17 are in thermal contact with a base plate 6, in particular a metal base plate, which in turn is in thermal contact with the energy storage devices 4. The cooling device 18, which includes a plurality of cooling plates 17, is arranged here between every two webs or ribs 14 of the sandwich structure 10 and here extends over as large a range as possible of the distance between the two webs or ribs 14, in particular over more than two thirds of this distance. The cooling device 18 is connected to the cooling system via lines that convey the cooling fluid, wherein these lines (not shown) are preferably led out from the side or bottom of the sandwich structure 10, wherein the sandwich structure 10 can have corresponding openings or recesses for this purpose, through which these lines are led.

[0042] The cooling plate 17 can be fastened to the housing bottom 6 of the energy storage housing 3, for example, by means of further screws (not shown). Furthermore, the cooling plate 17 is arranged spaced apart from the sandwich structure 10, that is, a heat-insulating air layer or air cushion 19 remains between the cooling plate 17 and the sandwich structure 10. The distance between the cooling plate 17 and the sandwich structure 10 remains constant here, since the sandwich structure 10 has a constant height between the webs or ribs 14. However, it is also possible for the sandwich structure 10 to be curved, that is, bridge-shaped, in the region between every two webs or ribs 14.

[0043] The filling material 13 will be described in detail below. The filling material 13 is designed as a filling foam in the illustrated embodiment and is therefore designed as a heat insulating material. The filling material 13 can be composed of polyethylene terephthalate, polyurethane or polymethacrylimide. The filling material can be solidified or arranged as a plate-shaped part, wherein if necessary, a groove for the screw head of the filling material 13, such as the cooling plate 17, can be realized by means of local overcompression by a tool. Therefore, the filling material 13 is not only used to improve the mechanical stability of the accumulator housing assembly 2, but also used for the heat insulation of the accumulator 4 and the cooling plate 17 in addition to the air cushion 19. Therefore, it is disadvantageous that the cooling power provided by the cooling device 18 is lost to the outside via the bottom protection device 5, especially in the case of high external temperatures, which has been solved so far by, for example, a spacer with low thermal conductivity between the accumulator housing 3 and the bottom protection device 5, which is formed as a separate component. Therefore, such a component is no longer required in the present invention.

[0044] The upper cover plate 11 and the lower cover plate 12 are made of fiber-reinforced plastic. Fibers made of glass and / or carbon and / or natural fibers are used here by way of example, and are present in the form of semi-finished textile products, such as textile fabrics.

[0045] Depend on Figure 3 It can be seen that the filling material 13 is only arranged in the region of the sandwich structure 10 adjacent to the accumulator housing 3. In the region 20 of the sandwich structure 10 that protrudes laterally from the accumulator housing 3, the upper cover plate 11 is directly fixed to the lower cover plate 12. Therefore, in this region, in particular, the thermal insulation effect of the filling material 13 is no longer required, so that the sandwich structure 10 can have a correspondingly simplified structure in its lateral region 20.

Claims

1. An accumulator housing assembly for a motor vehicle (1), comprising an accumulator housing (3) and an underbody protection device (5) fixed to the accumulator housing (3) at the bottom, It is characterized in that The underbody protection device (5) comprises a sandwich structure (10), which has an upper cover plate (11) on its upper side facing the accumulator housing (3) and a lower cover plate (12) on its lower side, wherein a filling material (13) is arranged between the upper cover plate (11) and the lower cover plate (12), the upper side of the sandwich structure (10) is formed with a web or rib (14), the underbody protection device (5) is fixed to at least one reinforcement element (9) and / or to at least one side wall (21) of the accumulator housing in the region of the web or rib (14), the at least one reinforcement element being arranged inside the accumulator housing (3) and serving to increase the mechanical stability of the accumulator housing (3), the filling material (13) being arranged between the upper cover plate (11) and the lower cover plate (12), ) is arranged between an upper cover plate (11) and a lower cover plate (12) only in an area of ​​the sandwich structure (10) adjacent to the accumulator housing (3), while in other areas the upper cover plate (11) and the lower cover plate (12) are in direct contact with each other or the sandwich structure (10) still only includes the upper cover plate (11) or only includes the lower cover plate (12), wherein the at least one reinforcement element (9) is a support part (8) of the accumulator housing (3), which extends at least partially along a bottom plate (6) of the accumulator housing (3) between two opposite side walls (21) of the accumulator housing (3), and the longitudinal axis of each web or rib (14) extends parallel to the longitudinal axis of each corresponding support part (8) or side wall (21).

2. The accumulator housing assembly according to claim 1, characterized in that: In the area (20) protruding laterally from the accumulator housing (3), the upper cover plate (11) and the lower cover plate (12) are in direct contact with each other or the sandwich structure (10) comprises only the upper cover plate (11) or only the lower cover plate (12).

3. The accumulator housing assembly according to claim 1, characterized in that: A plurality of screws (15), sleeves and / or rivets are passed through the sandwich structure (10) and the bottom plate (6) of the accumulator housing (3) and fixed to the support element (8).

4. The accumulator housing assembly according to claim 1 or 2, characterized in that: At least one cooling device (18) is arranged between the bottom protection device (5) and the accumulator housing (3), the at least one cooling device being in thermal contact with at least one accumulator (4) accommodated in the accumulator housing (3), the at least one cooling device comprising at least one cooling plate (17).

5. The accumulator housing assembly according to claim 4, characterized in that: The sandwich structure (10) has at least two webs or ribs (14), wherein the cooling device (18) is arranged between the two webs or ribs (14) and extends over at least half of the distance between the webs or ribs (14).

6. The accumulator housing assembly according to claim 1 or 2, characterized in that: The filling material (13) is a heat insulating material.

7. The accumulator housing assembly according to claim 1 or 2, characterized in that: The upper cover plate (11) and / or the lower cover plate (12) are made of plastic and / or are fiber-reinforced.

8. The accumulator housing assembly according to claim 5, characterized in that: The cooling device (18) extends over two thirds of the distance between the webs or ribs (14).

9. The accumulator housing assembly according to claim 6, characterized in that: The filling material (13) is filling foam.

10. A bottom protection device for an accumulator housing assembly (2) according to any one of the preceding claims, characterized in that When the underbody protection device is fixed to the accumulator housing (3), the underbody protection device (5) comprises a sandwich structure (10), which has an upper cover plate (11) on its upper side facing the accumulator housing (3) and a lower cover plate (12) on its lower side, wherein a filling material (13) is arranged between the upper cover plate (11) and the lower cover plate (12), and the upper side of the sandwich structure (10) is formed by webs or ribs (14).

11. The bottom protection device according to claim 10, characterized in that: The filling material (13) is a heat insulating material.

12. The bottom protection device according to claim 10 or 11, characterized in that: The upper cover plate (11) and / or the lower cover plate (12) are made of plastic and / or are fiber-reinforced.

13. The bottom protection device according to claim 10 or 11, characterized in that: The filling material (13) is arranged between the upper cover plate (11) and the lower cover plate (12) only in the area of ​​the sandwich structure (10) adjacent to the accumulator housing (3), while in other areas, the upper cover plate (11) and the lower cover plate (12) are in direct contact with each other or the sandwich structure (10) only includes the upper cover plate (11) or only includes the lower cover plate (12).

14. The bottom protection device according to claim 11, characterized in that: The filling material (13) is filling foam.

15. The bottom protection device according to claim 13, characterized in that: In the area (20) protruding laterally from the accumulator housing (3), the upper cover plate (11) and the lower cover plate (12) are in direct contact with each other or the sandwich structure (10) comprises only the upper cover plate (11) or only the lower cover plate (12).

16. A motor vehicle comprising an accumulator housing assembly (2) according to any one of claims 1 to 9.

Images