Housing arrangement for a high-voltage energy storage device and motor vehicle

Abstract

Housing arrangement (14) for a high-voltage energy storage device (12) of a motor vehicle (10), wherein the housing arrangement (14) comprises a housing (20) for receiving multiple storage modules (16), which has an outer surface (20a) which, in a state in which the multiple storage modules (16) are received in the housing (20), faces away from the multiple storage modules (16), characterized in that the housing arrangement (14) comprises an electrically insulating insulating element (24; 24a, 24b, 24c) which is arranged in at least a certain area (20c) of the outer surface (20a) of the housing (20), which, when the housing (20) is in its intended installation position in the motor vehicle (10), faces at least one vehicle electrical system component (22a, 22b) of a vehicle electrical system (22) encompassed by the motor vehicle (10) with a reduced voltage level compared to the high-voltage energy storage device (12), wherein the Insulation element (24;24a, 24b, 24c)- is designed as a felt material (24b) and / or as a hook and loop fastener or leather, and / or- is designed to provide a holder (24d) for a cable and / or a wire.;

Description

The invention relates to a housing arrangement for a high-voltage energy storage device of a motor vehicle, wherein the housing arrangement comprises a housing for receiving multiple storage modules, which has an outer surface that, in a state in which the multiple storage modules are received in the housing, faces away from the multiple storage modules. The invention also includes a motor vehicle with such a housing arrangement. A high-voltage energy storage device, such as a high-voltage battery, typically comprises several battery modules, each containing multiple individual battery cells. These individual battery modules, or more generally, the storage modules, are then typically arranged in a housing that can be directly or indirectly coupled to, or attached to, the vehicle's body. Furthermore, such a high-voltage battery may also include other components, such as a cooling system for cooling the individual battery cells. In this context, DE 10 2011 015 152 A1 describes an energy storage device with a plurality of storage cells and a temperature control device for maintaining the temperature of the storage cells. Since the cell casing walls are often made of metal and are subject to an electrical voltage, a cooling plate is separated from the cell casings by electrical insulation, such as a thermally conductive film or similar material, to prevent short circuits. Similarly, DE 10 2010 013 025 A1, which describes a battery with a cooling plate arranged in a battery casing, discloses that, if a voltage is applied to the cell casings of the individual battery cells, an electrically insulating thermally conductive film or potting compound can be arranged between the individual cells and the thermally conductive plate to prevent short circuits. Furthermore, DE 10 2010 055 598 A1 describes a single cell for a battery with two housing parts that are electrically separated from each other by an insulating housing frame, which consists at least partially of a thermoplastic material. An electrode foil stack arranged within the housing frame is also located between the two housing parts. The casing of the high-voltage energy storage device itself is typically electrically insulated from the high-voltage potentials and is grounded. This means the battery casing can be safely touched from the outside without fear of electric shock. However, since voltages in the high-voltage range can be life-threatening, there is still a desire to make such a high-voltage energy storage system as safe as possible. DE 10 2017 205 439 A1 describes a housing device comprising a housing formed from a metal sheet and at least one insulating element designed as a plate or formed plate, which is made partly or entirely of plastic, wherein the insulating element is arranged flat on a surface of an inner and / or an outer surface of the housing and covers the surface at least partially. DE 10 2011 083 663 A1 describes an energy storage device with a cell arranged in a dimensionally stable metallic housing, wherein a laminate is arranged at least partially on the outer side of the housing, comprising at least one electrically insulating layer and at least one protective layer, wherein the laminate is designed as a molded part arranged flat on and attached to the housing. The object of the present invention is therefore to provide a housing arrangement for a high-voltage energy storage device of a motor vehicle and a motor vehicle which allows for the safest possible design of such a high-voltage energy storage device. This problem is solved by a housing arrangement and a motor vehicle with the features according to the respective independent patent claims. Advantageous embodiments of the invention are the subject of the dependent patent claims, the description, and the figures. A housing arrangement according to the invention for a high-voltage energy storage device of a motor vehicle comprises a housing for receiving several storage modules, which has an outer surface that, in a state in which the several storage modules are received in the housing, faces away from the several storage modules. The housing arrangement includes an electrically insulating insulating element, which is arranged in at least a certain area of ​​the outer surface of the housing. When the housing is in its intended installation position in the motor vehicle, this area faces at least one vehicle electrical system component of a vehicle electrical system with a lower voltage level compared to the high-voltage energy storage device.Furthermore, it is provided that the insulating element according to a first aspect of the invention is designed as a felt material and / or as a Velcro fastener or leather, and / or according to a second aspect of the invention is designed to provide a holder for a cable and / or a wire. The invention is based on the understanding that, in the event of a fault, for example due to incorrect assembly or disassembly, or during maintenance work, it is possible for voltage fluctuations, such as short circuits, to occur between the high-voltage energy storage system (i.e., the high-voltage energy storage device) and the low-voltage or medium-voltage electrical system, if present. These fluctuations can lead to various fault patterns or damage to the system components. This risk is particularly high if, for example, a fault already exists in which the housing of the high-voltage energy storage device is in contact with a high-voltage potential or with a potential of the low- or medium-voltage electrical system.If, for example, during maintenance work on the low- or medium-voltage electrical system, the other of the two low- or medium-voltage potentials is accidentally connected to the housing of the high-voltage energy storage device, for instance via a metallic tool, this leads to a current flow, in particular a short circuit, which can cause serious damage. Although other safety features are usually incorporated in a motor vehicle, such as an insulation monitor that typically monitors the insulation between the electrical system potentials and the housings, such double insulation faults can sometimes be very difficult to detect or may be detected too late, meaning that damage may already have occurred.The invention advantageously provides an electrically insulating element on the outside of the housing for the high-voltage energy storage device. This element is arranged to face at least one component of the vehicle's electrical system with a lower voltage level than the high-voltage energy storage device, such as a 12-volt or 48-volt component. During maintenance or in the event of a fault, particularly during installation or removal, this insulating element advantageously prevents any contact between this at least one component and the housing of the high-voltage energy storage device, which is typically made of metal. This advantageously eliminates or at least reduces the risk of a short circuit between the high-voltage storage system and, for example, the low-voltage electrical system.As described in more detail below, such an insulating element can also be designed to be particularly simple and cost-effective, so that ultimately the safety associated with high-voltage energy storage systems can be increased in a particularly simple, cost-effective and efficient way. The high-voltage energy storage system can, for example, be a high-voltage battery as defined above, which may comprise several storage modules designed as battery modules. Each such battery module can, in turn, include several individual battery cells grouped together to form a cell pack. In addition to the high-voltage electrical system, the vehicle may also have, as mentioned earlier, a low-voltage electrical system (e.g., a 12-volt system) and / or a medium-voltage electrical system (e.g., a 48-volt system) as examples of electrical systems with a lower voltage level compared to the high-voltage energy storage system. A component of such an electrical system is then supplied with energy at the same voltage level, i.e., 12 volts or 48 volts.Such on-board network components can then, for example, represent further energy storage devices, such as a 12-volt battery and / or a 48-volt battery, various consumers, cables, lines or other current- and / or voltage-carrying components that are connected to at least one of the potentials provided by such a low- or medium-voltage on-board network. The voltage level of the high-voltage energy storage device is preferably more than 100 volts, such as 400 volts or 800 volts. In an advantageous embodiment of the invention, the insulating element is designed as a film and / or, according to the first aspect of the invention, as a felt material and / or as a hook-and-loop fastener. In this way, the insulating element can be adapted particularly easily and flexibly to the geometry of the housing or to the geometry of the area of ​​the outside of the housing, since in all these cases the insulating element can be provided as a bendable or flexible, non-rigid component. This allows the insulating element to be attached to any desired location on the housing particularly easily and cost-effectively. For example, the insulating element can have a self-adhesive film, particularly a plastic film, and thus be provided in the form of a sticker that can be easily applied to the outside at the desired position. Furthermore, such a film can be opaque, transparent, or semi-transparent. In the case of a transparent film, any content applied over it, such as labels, instructions, pictograms, other stickers, or similar items on the outside of the housing, advantageously remain visible. Such a film can also itself serve as a carrier for informational texts or similar content.The insulating element can therefore be designed, either transparent or opaque, to fulfill both the function of a sticker for content, such as labels, instructions, or pictograms, and the function of insulation, particularly electrical insulation. To serve as a carrier for such content, the film can be appropriately labeled, printed, or otherwise marked with symbols or text on one or both sides. Furthermore, the insulating element, especially if it is designed as a film, can have different layer thicknesses depending on the requirements, for example, the geometry of the housing, the required dielectric strength, the required transparency, and so on, particularly with thicknesses between 50 micrometers and one millimeter, such as 100 micrometers, 200 micrometers, 300 micrometers, or similar thicknesses. This film can also be made of different materials, or various materials are suitable for its production and supply, such as PU (polyurethane), PE (polyethylene), PET (polyethylene terephthalate), and PVC (polyvinyl chloride). The film can also be made of several such plastics simultaneously, for example, as a multilayer film.Furthermore, the film can have any geometry, particularly two-dimensional or three-dimensional, with a suitably chosen length and / or width, depending on its intended location on the outside of the housing. This allows for a particularly high degree of flexibility and adaptability by designing the insulating element as a film. The same applies to designing the insulating element as felt. In this case, too, the insulating element can, for example, be designed as self-adhesive felt, which enables particularly easy application to the outside of the housing.Here too, the insulating element can be provided with a suitably adapted layer thickness, in particular different layer thicknesses, depending on the requirements, for example, the geometry of the housing or other factors such as the required dielectric strength, etc. It can also be made of different materials and / or have different geometries, such as being two- and / or three-dimensional and / or having different lengths and / or widths. In particular, the insulating element can again have a thickness within the aforementioned range and be made of the aforementioned plastics or other materials. The same applies if the insulating element is designed as a hook-and-loop fastener.If the insulating element is designed as a Velcro fastener, it can, in addition to its function of electrical insulation, also easily take on the task of providing a cable holder or wire holder or similar. In a further advantageous embodiment of the invention, the insulating element is designed as a dimensionally stable plastic component, in particular as a foamed plastic component and / or as an injection-molded plastic component and / or as an additively manufactured plastic component. If the insulating element is designed as a dimensionally stable plastic component, it preferably already possesses essentially the geometry of the corresponding area of ​​the outside of the housing before being arranged on that area. By designing the insulating element as a dimensionally stable plastic component in this way, significantly thicker layers, particularly in the millimeter range, such as one millimeter, 1.5 millimeters, two millimeters, and so on, preferably in the range between one millimeter and five millimeters, can be achieved. This allows for higher dielectric strength.Various materials, which can be combined with each other, are also suitable for the formation of the insulating element, in particular the plastics mentioned above, such as PVC, especially E-PVC, that is polyvinyl chloride, which was produced by emulsion polymerization. Here too, the insulating element can be made transparent, semi-transparent, or opaque, depending on the requirements. Furthermore, even with a dimensionally stable insulating element, it can also serve as a cable or wire holder. However, the insulating element is not limited to the materials mentioned above; it can also be made of paper, elastomer, leather, bitumen, and so on, or generally of other electrically insulating materials. Even with such materials, it is possible to flexibly adapt the insulating element to the specific requirements, particularly with regard to thickness, geometry, transparency, and so forth. The housing arrangement can also include differently designed insulating elements, which, for example, can be arranged in different positions or in different areas of the outside of the housing. As already mentioned, the insulating element can also provide one or more additional functions if required. Therefore, it represents a further advantageous embodiment of the invention if the insulating element is designed to provide at least one function other than electrical insulation. Providing a dual or multiple function can advantageously further increase the efficiency of the insulating element. It is particularly advantageous if at least one function is at least one of the following: providing a holder for a cable and / or line, providing a spacer to keep the housing at a defined distance from a motor vehicle component, providing heat shielding, providing a carrier function for displaying informational texts and / or symbols, and providing abrasion protection. Providing a cable holder or wire holder is particularly advantageous because vehicles typically have various wires and / or cables running in the area of ​​the high-voltage energy storage system. These can be guided and / or secured in this way without requiring an additional component or a separately manufactured holder. Such a holder can be provided particularly easily if the insulating element is made of a dimensionally stable plastic, as already described, or, for example, if it is designed as a hook-and-loop fastener, allowing a simple loop to be created for guiding the cable or wire. Depending on its position, the insulating element can also function as a defined spacer to maintain the housing at a specific distance from one or more vehicle components, such as the cargo floor in the trunk. This eliminates the need for separate components, particularly spacers. Furthermore, depending on its design, the insulating element can also be used as thermal insulation.Plastics, in particular, generally offer good thermal insulation properties, especially compared to metals, so that, for example, by providing the insulating element, cooling power for cooling the high-voltage energy storage system can also be saved, since this high-voltage energy storage system can now be advantageously well thermally insulated from the environment via the provided insulating element. Furthermore, as described earlier, the insulating element, with suitable labeling, printing, or similar, can also serve as a carrier for informational texts, symbols, pictograms, or the like. This, in turn, allows for the inclusion of additional stickers or other components. The insulating element can also provide abrasion protection. This is particularly effective when the insulating element is made of felt, Velcro, leather, or a similar material. This advantageously allows the housing assembly, especially the insulating element, to be directly attached to other vehicle components without risk of mechanical damage, destruction, or scratching.This in turn saves installation space, as it provides significantly more compact arrangement options for the vehicle components. In a further advantageous embodiment of the invention, the housing has a cover which, when the housing is in its intended installation position in the motor vehicle, provides a top surface for the housing, with the specific area of ​​the outer surface in which the insulating element is arranged being provided by the cover. In other words, the insulating element is arranged on the cover of the housing. This allows for particularly efficient insulation of on-board electrical system components with a lower voltage level compared to the high-voltage energy storage device, since such other on-board electrical system components are typically located above the high-voltage energy storage device. In principle, the insulating element can be provided at any other location on the housing, either additionally or alternatively. Furthermore, the insulating element can cover or insulate a partial area, particularly only a partial area, or entire components or systems. Accordingly, it is an advantageous embodiment of the invention, for example, if only a portion of the outer surface of the housing has the insulating element, or if the insulating element is arranged only in a portion of the outer surface of the housing, so that a portion of the outer surface of the housing is not electrically insulated. This has the significant advantage that the insulating element, or possibly several separate insulating elements, can be positioned specifically in those areas that face components, i.e., components of the vehicle electrical system with a lower voltage level compared to the high-voltage energy storage device. This allows for a particularly efficient design, since the housing does not need to be completely covered with such an insulating element, i.e., not necessarily in areas where there is no risk of a short circuit anyway. Nevertheless, it is also possible, as provided for in a further embodiment of the invention, for the insulating element to cover essentially the entire outer surface of the housing. This design allows for a particularly high degree of flexibility, since even if the arrangement of components within a motor vehicle changes, for example in the next generation of the vehicle, no change or adjustment to the position of the insulating element in the housing of the high-voltage energy storage device is necessary, as the insulating element completely covers the housing and provides electrical insulation to the outside anyway. Since the insulating element, as described above, can be designed to be particularly simple and cost-effective, this embodiment of the invention allows the flexibility and application possibilities of the housing arrangement to be increased in a particularly efficient and cost-effective manner. A high-voltage energy storage device, such as a high-voltage battery, with a housing arrangement according to the invention or one of its embodiments, shall also be considered to belong to the invention. The high-voltage energy storage device can be configured as described above and, for example, comprise several battery modules, each with several individual battery cells. These storage modules, configured as battery modules, can then be arranged accordingly in the described housing. Furthermore, the invention also relates to a motor vehicle with a housing arrangement according to the invention or one of its embodiments. It is particularly advantageous if the motor vehicle has at least one on-board power supply component, in particular a 12-volt on-board power supply component and / or a 48-volt on-board power supply component, of an on-board power supply with a reduced voltage level compared to the high-voltage energy storage device, wherein the insulating element is arranged on the outside of the housing in such a way that the insulating element is located between the at least one on-board power supply component and the housing. As already described in connection with the housing arrangement according to the invention and its embodiments, this eliminates or at least reduces the risk of a short circuit between the high-voltage storage system and the low-voltage electrical system. Furthermore, the advantages mentioned in connection with the housing arrangement according to the invention and its embodiments apply equally to the motor vehicle according to the invention. The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle. Furthermore, the motor vehicle can be provided as an electric vehicle and / or a hybrid vehicle with an electric drive. The invention also includes combinations of the features of the described embodiments. The following are exemplary embodiments of the invention. Figure 1 shows a schematic representation of a motor vehicle with a high-voltage energy storage device and a housing arrangement according to one exemplary embodiment of the invention; Figure 2 shows a schematic representation of part of a housing cover of a housing arrangement with an insulating element arranged on the outside and designed as a film according to one exemplary embodiment of the invention; Figure 3 shows a schematic representation of a housing cover of a housing arrangement with an insulating element arranged on the outside and designed as felt according to another exemplary embodiment of the invention; and Figure 4 shows a schematic representation of part of a housing cover of a housing arrangement with an insulating element arranged on the outside and designed as a dimensionally stable plastic component according to another exemplary embodiment of the invention. The exemplary embodiments described below are preferred embodiments of the invention. In these exemplary embodiments, the described components each represent individual features of the invention, which can be considered independently of one another and each further develops the invention independently. Therefore, the disclosure is intended to include combinations of features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described. In the figures, identical reference symbols denote functionally equivalent elements. Fig. 1 shows a schematic representation of a motor vehicle 10 with a high-voltage energy storage device 12, which comprises a housing arrangement 14 according to an embodiment of the invention. The high-voltage energy storage device 12 is designed as a high-voltage battery 12 and has several storage modules designed as battery modules 16, of which, for the sake of clarity, only one is provided with a reference numeral. Each of these storage modules 16 in turn has several individual battery cells 18, of which again, for the sake of clarity, only one is provided with a reference numeral. These individual battery cells 18 can, for example, be designed as lithium-ion cells. Furthermore, the housing arrangement 14 comprises a housing 20 in which the storage modules 16 are received. This housing 20 in turn has an outer surface 20a, which faces away from the storage modules 16.Furthermore, the motor vehicle 10 also includes a low-voltage electrical system 22, for example, a 12-volt electrical system or a 48-volt electrical system. This low-voltage electrical system 22 in turn has several electrical system components 22a, 22b, such as a 12-volt battery and / or a 48-volt battery and / or various consumers, cables, and so on. In this example, these electrical system components 22a, 22b are arranged above the high-voltage energy storage device 12. In conventional motor vehicles with high-voltage energy storage systems, in the event of a fault, voltage fluctuations, particularly short circuits, can occur between such a high-voltage energy storage system and the low-voltage electrical system, leading to various fault patterns or damage to the system components. Such voltage fluctuations can advantageously be avoided by attaching or arranging an insulating element 24 (see Fig. 2, Fig. 3 to Fig. 4) either partially or completely on the outside of the housing 20 of the high-voltage energy storage system 12. In particular, this insulating element 24 is arranged in a region 20c of the outer surface 20a of the housing 20, which faces at least one of the electrical system components 22a, 22b of the low-voltage electrical system 22.This advantageously prevents a short circuit from occurring if a part of such a vehicle electrical system component 22a, 22b, in particular a contact of a potential of this low-voltage vehicle electrical system 22, comes into contact with the outside 20a of the housing 20 in this area 20c in which the insulating element 24 is arranged. Many advantageous possibilities are now available for the formation of this insulating element 24, which will be explained in more detail below. Figure 2 shows a schematic representation of part of a housing cover 20b of the housing 20 of the high-voltage energy storage device 12, with an insulating element 24 designed as a self-adhesive film 24a according to an embodiment of the invention. The insulating element 24 is thus designed as a sticker 24a, which can be easily affixed to the outer surface 20a of the housing 20, in this example on the housing cover 20b, or in this example is already affixed, thus sealing the housing 20 upwards, i.e., towards the low-voltage electrical system 22. The design as such a film 24a offers a particularly high degree of flexibility, especially with regard to its geometric design, transparency, thickness, and possible arrangement.Since such a film 24a, due to its thinness, particularly in the three-digit micrometer range, can be easily adapted to any geometry, especially 2D or 3D, and can be adhered or otherwise attached to the housing cover 20b or, more generally, to the outer surface 20a of the housing 20, such a film 24a provides a particularly simple, cost-effective, and advantageous way of providing an insulating element 24. The insulating element 24, which in this example is designed as a film 24a, can therefore be opaque or transparent. In the case of a transparent film 24a, any coverings, such as existing labels, remain visible.The insulating element can also be designed to function as a sticker for content such as labels, instructions, pictograms, and so on, in addition to its function as an electrically insulating element 24. Such labels can be provided by the film 24a in both opaque and transparent versions. Not only the cover 20b of the housing 20 can be covered with such a film 24a, but also the underside of the housing 20, and generally any part of the housing 20 or even the entire outer surface 20a of the housing. Fig. 3 shows a schematic representation of part of a housing cover 20b of a housing 20 of a high-voltage energy storage device 12 according to a further embodiment of the invention. In this example as well, an insulating element 24 is arranged on the outer surface 20a of this housing cover 20b. In this example, the insulating element 24 is designed as felt 24b. Such a felt material 24b can also be as thin as described, for example, for the foil 24a, or somewhat thicker. The thicker design of such a felt material 24b increases the dielectric strength. Nevertheless, even in a somewhat thicker design, for example, in the millimeter range, such a felt material 24b remains flexible and can thus be adapted to any desired geometry of the outer surface 20a of the housing 20 and is therefore just as versatile as described for the foil 24a.In addition, such a felt fabric can also serve as abrasion protection and, depending on the material chosen for the felt, can also provide heat shielding. Alternatively or additionally, the insulating element 24 can also be designed as a hook-and-loop fastener and then, for example, additionally fulfill the function of a cable holder. Such a hook-and-loop fastener also provides a particularly flexible design option for the insulating element, which can thus adapt flexibly to any geometry of the outer surface 20a of the housing 20 and can therefore be arranged at any desired position on the outer surface 20a of the housing 20. Fig. 4 shows a schematic representation of part of a housing cover 20b of the housing 20 with an insulating element 24 according to a further embodiment of the invention. In this example, the insulating element 24 is designed as a dimensionally stable plastic part 24c. Such a plastic part 24c can, for example, be made of foamed plastic, injection-molded plastic, or a plastic manufactured with an additive. In this case, to provide the insulating element 24, particularly before its arrangement on the housing 20, the geometry of this insulating element 24 is adapted to the geometry of the outer surface 20a of the area 20c in which the insulating element 24 is to be arranged. Nevertheless, such dimensionally stable plastic insulating elements 24c can be produced simply and cost-effectively by injection molding or other simple manufacturing processes and adapted to any desired geometry. In particular, this also makes it particularly easy to provide the insulating element 24 with a geometry that can be curved in two different spatial directions, such as at rounded corners of the housing 20.In the case of a design as foil or felt or similar, this is only possible by accepting a certain amount of folding or a multi-part design of the insulation element 24, which is nevertheless still easy to provide. A dimensionally stable plastic part 24c is particularly suitable as an insulating element 24 when even higher dielectric strengths are required, as this plastic part 24c allows for layer thicknesses in the millimeter range and more. At the same time, flexibility regarding material selection, especially the choice of plastic used for the plastic part 24c, as well as the choice of transparency, is again possible, just as described for the film 24a. Here too, the insulating element 24 can provide additional functions, such as serving as a carrier for informational texts, symbols, and so on. With a transparent design, informational texts arranged directly on the outside 20a of the housing 20 can still be seen through this insulating element 24.In this example, the insulating element 24 also advantageously provides an additional holder 24d, by means of which, for example, a cable and / or a conductor can be secured, clamped, or guided. This eliminates the need for additional holders for guiding or holding cables. In general, the insulating element 24 can perform additional functions besides its electrical insulating function, such as holding cables, providing abrasion protection, acting as a spacer, offering warning shielding, and serving as a carrier for informational text, symbols, or lettering. This eliminates the need for numerous additional components, such as cable holders, spacers, protective elements, shielding elements, stickers, and so on. Overall, the examples show how the invention can provide an external insulating element on a housing of an HV storage system, which, by its arrangement between the housing and components of a low-voltage electrical system, can avoid voltage influences, especially short circuits, between the HV storage system and the low-voltage electrical system in a particularly efficient and cost-effective manner.

Claims

Housing arrangement (14) for a high-voltage energy storage device (12) of a motor vehicle (10), wherein the housing arrangement (14) comprises a housing (20) for receiving multiple storage modules (16), which has an outer surface (20a) which, in a state in which the multiple storage modules (16) are received in the housing (20), faces away from the multiple storage modules (16), characterized in that the housing arrangement (14) comprises an electrically insulating insulating element (24; 24a, 24b, 24c) which is arranged in at least a certain area (20c) of the outer surface (20a) of the housing (20), which, when the housing (20) is in its intended installation position in the motor vehicle (10), faces at least one vehicle electrical system component (22a, 22b) of a vehicle electrical system (22) encompassed by the motor vehicle (10) with a reduced voltage level compared to the high-voltage energy storage device (12), wherein the Insulation element (24;24a, 24b, 24c)- is designed as a felt material (24b) and / or as a hook and loop fastener or leather, and / or- is designed to provide a holder (24d) for a cable and / or a wire.; Housing arrangement (14) according to claim 1 , characterized in that the insulating element (24; 24a, 24b, 24c) is designed to provide a holder (24d) for a cable and / or a conductor and is designed as a dimensionally stable plastic component (24c), in particular as a foamed plastic component (24c) and / or as an injection-molded plastic component (24c) and / or as an additively manufactured plastic component (24c). Housing arrangement (14) according to one of the preceding claims, characterized in that the insulating element (24; 24a, 24b, 24c) is additionally designed to provide at least one function other than electrical insulation. Housing arrangement (14) according to claim 3, characterized in that the at least one function is at least one of the following: - providing a spacer to keep the housing (20) at a defined distance to a motor vehicle component; - providing heat shielding; - providing a carrier function for carrying informational text and / or symbols; - providing abrasion protection. Housing arrangement (14) according to one of the preceding claims, characterized in that the housing (20) has a cover (20b) which, when the housing (20) is in its intended installation position in the motor vehicle (10), provides a top surface of the housing (20), wherein the specific area (20c) of the outside (20a) in which the insulating element (24; 24a, 24b, 24c) is arranged is provided by the cover (20b). Housing arrangement (14) according to one of the preceding claims, characterized in that only a part of the outside (20a) of the housing (20) has the insulating element (24; 24a, 24b, 24c). Housing arrangement (14) according to one of claims 1 to 5, characterized in that the insulating element (24; 24a, 24b, 24c) is arranged to cover substantially the entire outside (20a) of the housing (20). Motor vehicle (10) with a housing arrangement (14) according to one of the preceding claims. Motor vehicle (10) according to claim 8, characterized in that the motor vehicle (10) has at least one on-board power supply component (22a, 22b), in particular a 12V on-board power supply component (22a, 22b) and / or a 48V on-board power supply component (22a, 22b), of an on-board power supply (22) with a reduced voltage level compared to the high-voltage energy storage device (12), wherein the insulating element (24; 24a, 24b, 24c) is arranged on the outside (20a) of the housing (20) such that the insulating element (24; 24a, 24b, 24c) is located between the at least one on-board power supply component (22a, 22b) and the housing (20).

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