Battery housing component, method for producing same, traction battery housing, traction battery for a motor vehicle, and motor vehicle comprising a traction battery

Abstract

The invention relates to a battery housing component (10, 20) for a traction battery housing (1) for receiving at least one battery component (4), wherein the battery housing component (10, 20) has a connecting device (11, 21) provided around the edge of the battery housing component for connecting to a second battery housing component (10, 20), the battery housing component (10, 20) has a first fluid seal (30) provided over the circumference of the battery housing component in the region of the connecting device (11, 21) and an electrically conductive seal (40) provided over the circumference in the region of the connecting device (11, 21), the first fluid seal (30) is in direct contact with the electrically conductive seal (40) over at least 50% of the vertical extent (43) of the electrically conductive seal (40), and the electrically conductive seal (40) is positioned on the inside with respect to the first fluid seal (30). The invention also relates to a method for producing a battery housing component (10), to a traction battery housing (1), to a traction battery, and to a motor vehicle.

Description

[0001] Applicant: KAUTEX TEXTRON GmbH & Co. KG

[0002] Battery housing component and method for its manufacture, traction battery housing, traction battery for a motor vehicle and motor vehicle with a traction battery

[0003] The invention relates to a battery housing component. The invention further relates to a method for manufacturing a battery housing component. The invention further relates to a traction battery housing. The invention further relates to a traction battery comprising the above traction battery housing. The invention further relates to a motor vehicle comprising the above traction battery.

[0004] Traction battery housings for electric vehicle traction batteries are known in the prior art. These housings consist of at least two connected metallic components, typically made of aluminum or steel. They offer effective protection against electromagnetic radiation both emanating from and affecting the battery, for example, from radiation sources within the vehicle. A disadvantage of these metallic housings is their high weight, which can impair the vehicle's efficiency and range. Further disadvantages include their long manufacturing time and high production costs.

[0005] EP 2 742 549 Bl describes a battery housing component for traction batteries of electric vehicles and a method for its manufacture. The battery housing component consists of a receiving body made of thermoplastic or thermoset plastic material and a flat element made of electrically conductive material. The flat element serves to shield the area surrounding the battery housing component and / or the traction battery from electromagnetic radiation. It can consist of a metal foil, nonwoven fabric, woven fabric, or conductive / polymeric foam material, or be a layer applied to the receiving body by means of sputtering, painting, vapor deposition, or electroplating.

[0006] This allows for a weight reduction compared to traction battery housings made of metallic materials, without compromising the shielding of the traction battery against electromagnetic radiation.

[0007] DE 10 2020 111 062 Al also describes a generic battery housing component with a base body and a shielding element, as well as a method for manufacturing such a battery housing component.

[0008] However, a challenge with known battery housing components lies in designing the connection point between two battery housing components forming a traction battery housing in such a way that the entire traction battery housing provides reliable shielding against electromagnetic radiation and simultaneously offers sufficient protection against condensation. Known solutions using a combination of a fluid seal and an EMC seal often require considerable installation space.

[0009] In particular, solutions have become established in the prior art that utilize a projection attached to the side of the EMC seal to fix the EMC seal to the battery housing component, for example by gluing. This results in a significantly increased space requirement.

[0010] However, in the course of the ever-increasing efficiency efforts of motor vehicle manufacturers, the reduction of installation space is a significant economic factor.

[0011] This leads to the underlying problem of the invention, namely that traction battery housings made from existing battery housing components require a large amount of installation space.

[0012] The invention is therefore based on the objective of providing a battery housing component that enables safe contacting of the contact surfaces of several battery housing components to be connected, as well as a reduction of the installation space of the resulting traction battery housing.

[0013] The problem underlying the invention is solved by a battery housing component having the features of claim 1 of the present invention. Advantageous embodiments are described in the dependent claims.

[0014] More precisely, the problem underlying the invention is solved by a battery housing component for a traction battery housing for receiving at least one battery component. The battery housing component has a circumferential connecting device for connection to a second battery housing component. The battery housing component further comprises a first fluid seal arranged circumferentially in the area of ​​the connecting device and an electrically conductive seal arranged circumferentially in the area of ​​the connecting device. The first fluid seal is in direct contact with the electrically conductive seal over at least 50% of the height of the electrically conductive seal, and the electrically conductive seal is positioned internally with respect to the first fluid seal.

[0015] The battery housing component according to the invention has the advantage that the need for a mounting lug, particularly one attached laterally, or any other type of fastening means for the electrically conductive seal is eliminated, resulting in a reduction of the installation space. In particular, this eliminates the free space between the fluid seal and the electrically conductive seal, which can also be referred to as an EMC seal, that is inevitably present in known solutions.

[0016] The battery housing component according to the invention also has the advantage that the direct contact between the fluid seal and the EMC seal supports the EMC seal during assembly, allowing it to have a slimmer shape, which also offers advantages in terms of installation space. The same applies to the fluid seal. Due to the direct contact with the EMC seal, it can be supported by it and therefore occupy a small contact area on the connection device.

[0017] The battery housing component according to the invention is designed as part of a traction battery housing for receiving at least one battery component. The battery components are preferably designed as battery cells. Furthermore, it is also possible that the battery components are designed as battery modules. The traction battery housing can be configured to receive the at least one battery component in a cavity of the traction battery housing created by the at least one battery housing component.

[0018] For the sake of clarity, the traction battery housing can also be referred to as the battery housing in this context. The battery housing component has a connecting element that circumferentially surrounds its edge, preferably in the form of a connecting flange. "Edge-side" here can mean that the connecting element is located in a region of the battery housing component that defines the contact area of ​​the battery housing component with another battery housing component. "Circularly surrounding" here can mean that the connecting element surrounds a receiving space formed by the battery housing in its assembled state. The connecting element can be configured to enable a connection with another battery housing component, particularly a detachable one. The connecting element can be a part of the housing body that does not form a boundary surface of the receiving space of the battery housing.

[0019] The battery housing component may be made of or contain metal. In particular, the connecting element of the battery housing component may be made of or contain metal.

[0020] The fluid seal serves to seal against ingress and / or escaping fluids, particularly escaping condensate. For this purpose, the first fluid seal consists of a material suitable for sealing against fluids. Preferably, the first fluid seal consists of polyurethane foam or silicone foam. In particular, the first fluid seal consists of a FIPFG (formed in-place foam gasket) made of polyurethane or silicone. A FIPFG is a seal that is applied directly to a component and foamed in place. This creates a flexible, permanent seal that conforms precisely to the contours of the component to protect against moisture, dust, or other influences. An electrically conductive seal can be a device that exhibits high electrical conductivity and deformability, preferably elastic deformability.The electrically conductive seal can be designed to physically bridge a gap existing in the assembled state of a traction battery housing comprising at least one first battery housing component according to the invention between a contact surface of the first battery housing component and a contact surface of a second battery housing component, and thus to establish an electrically conductive connection between the two contact surfaces.

[0021] The height of the electrically conductive seal is its extent in a direction perpendicular to the surface of the connection device. In particular, the height of the electrically conductive seal is its extent in a direction perpendicular to the surface of the connection device at a point of contact between the electrically conductive seal and the connection device.

[0022] The fact that the electrically conductive seal is in direct contact with the first fluid seal can mean that there is no other body or other matter between the electrically conductive seal and the first fluid seal.

[0023] The fact that the electrically conductive seal is positioned internally with respect to the first fluid seal can mean that, in the assembled state of the battery housing component, the electrically conductive seal is located closer to a receiving volume of a battery housing formed by the battery housing component and other components than the first fluid seal. The battery housing component may have a grounding device that is electrically connectable to the battery components and a terminal device that protrudes through the housing wall.

[0024] Preferably, the battery housing component is designed such that the first fluid seal is in direct contact with the electrically conductive seal over at least 60%, more preferably over at least 70%, more preferably over at least 80%, more preferably over at least 90% and more preferably over the entire height extent of the electrically conductive seal.

[0025] According to an advantageous embodiment, the battery housing component, in particular the connecting device, has a circumferential groove, wherein the electrically conductive seal is arranged in the groove.

[0026] This has the advantage that the electrically conductive seal can be arranged particularly precisely and therefore in a space-saving manner on the battery housing component.

[0027] A groove can be an elongated depression or recess, designed in particular to receive another element, preferably the electrically conductive seal. The groove can have a rectangular, round, oval, or triangular cross-section. The groove can have a height and a width, the height being greater or lesser than the width.

[0028] The groove can be one, and in particular the only, point where an electromagnetically insulating layer of the battery housing component is accessible and / or exposed from the outside. The fact that the electrically conductive seal is located in the groove can mean that the electrically conductive seal is at least partially surrounded by the groove.

[0029] According to an advantageous embodiment, the electrically conductive seal consists of a corrosion-resistant material and / or has corrosion protection.

[0030] This can have the advantage that the electrically conductive seal is not damaged by corrosion, thus extending the lifespan of the battery housing component. Furthermore, a corrosion-resistant, electrically conductive seal eliminates the need for a second, internal fluid seal to protect against condensation, which can offer advantages in terms of the installation space required for the battery housing component.

[0031] A corrosion-resistant material can be a material that, due to its chemical composition and structure, is able to withstand attack by corrosive media such as moisture, acids, bases or salts, and thus maintain its mechanical and physical properties over a longer period of time.

[0032] Corrosion protection can involve the application of coatings or other surface treatments to protect a surface from the corrosive influence of other media, thereby extending the service life of the surface and preserving its mechanical and physical properties.

[0033] According to an advantageous embodiment, the battery housing component has a second fluid seal arranged circumferentially in the area of ​​the connection device. The electrically conductive seal is positioned between the first and second fluid seals. This results in a particularly corrosion-resistant battery housing component. Furthermore, the electrically conductive seal can be designed without its own corrosion protection, leading to a more cost-effective battery housing component.

[0034] The fact that the electrically conductive seal is located between the first fluid seal and the second fluid seal may mean that the electrically conductive seal is positioned closer to the edge of the battery housing component than the second fluid seal, but further away from the edge than the first fluid seal.

[0035] The first fluid seal and the second fluid seal can be made of the same material. This allows for cost advantages in the battery housing component.

[0036] The first and second fluid seals can also be made of different materials. This allows for increased corrosion protection of the battery housing component, as the two fluid seals can be adapted to the prevailing conditions.

[0037] Preferably, the electrically conductive seal is in direct contact with the second fluid seal over at least 50% of its height. Preferably, the battery housing component is designed such that the second fluid seal is in direct contact with the electrically conductive seal over at least 60%, more preferably over at least 70%, more preferably over at least 80%, more preferably over at least 90%, and more preferably over its entire height. In a further embodiment, the electrically conductive seal has a trapezoidal cross-section tapering upwards, with the first fluid seal and / or the second fluid seal conforming to the chamfered outer surfaces of the electrically conductive seal.Preferably, the first fluid seal and / or the second fluid seal are arranged overlapping with the electrically conductive seal with respect to the base area of ​​the electrically conductive seal.

[0038] This has the advantage that the arrangement of one or two fluid seals and the electrically conductive seal can be designed to be particularly space-saving, which has advantages with regard to the installation space of the battery housing arrangement.

[0039] According to an advantageous embodiment, the battery housing component comprises a plastic. Preferably, the plastic is fiber-reinforced.

[0040] If the battery housing component is made of plastic, and especially fiber-reinforced plastic, this offers advantages in terms of weight. Cost advantages can also result. Furthermore, more complex shapes for the battery housing component can be achieved using plastics, which can lead to advantages in terms of the required installation space.

[0041] The battery housing component can comprise at least 50% plastic. The battery housing component can comprise at least 75% plastic. The battery housing component can comprise at least 85% plastic. The battery housing component can comprise at least 95% plastic. In one embodiment, the housing wall consists exclusively of a plastic or a combination of several plastics. The plastic is preferably a thermoplastic. More preferably, the plastic comprises polypropylene (PP), polyamides (PA), in particular polyamide 6, polystyrene (PS), polyethylene (PE), polybutylene terephthalate (PBT), or acrylonitrile butadiene styrene (ABS). Preferably, the plastic is fiber-reinforced. The fibers in the plastic matrix material are preferably glass fibers and / or carbon fibers and / or aramid fibers. The fiber material is preferably designed as long fibers and / or short fibers and / or continuous fiber material.

[0042] If the plastic is fiber-reinforced, it can be particularly tough and at the same time shock-resistant, resulting in advantages in terms of the longevity of the battery housing component.

[0043] As an alternative to a battery housing component made of plastic, it is also possible for the battery housing component to comprise one or more different metals. In particular, it is possible for the battery housing component to comprise more than 50%, preferably more than 70%, further preferably more than 90%, and further preferably 100% of one or a combination of several metals.

[0044] According to an advantageous embodiment, the battery housing component has an electromagnetically insulating layer. The electromagnetically insulating layer is in direct electrically conductive contact with the electrically conductive seal. Preferably, the battery housing component has a housing wall, and the electromagnetically insulating layer is at least partially surrounded by the housing wall.

[0045] If the battery housing component has an electromagnetically insulating layer, this can have advantages in terms of the electromagnetic shielding of the battery housing component, in particular through an electrically conductive contact between the electromagnetically insulating layer and the electrically conductive seal.

[0046] An electromagnetic insulating layer can be a component that prevents or significantly reduces the propagation of electromagnetic fields. In particular, an electromagnetic insulating layer can serve as electromagnetic shielding. An electromagnetic insulating layer can be a component that exhibits high electrical conductivity and / or high permeability. An electromagnetic insulating layer can consist of a metal, in particular copper, aluminum, steel, or a mu-metal. An electromagnetic insulating layer can consist of a conductive polymer, in particular poly-3,4-ethylenedioxythiophene (PEDOT), polyaniline (PAni), polyparaphenylene (PPP), polypyrrole (PPy), or doped polythiophene (PT).

[0047] If the electromagnetic insulating layer is made of a metal, it can be made particularly thin, which offers advantages in terms of the installation space required for the battery housing component. If the electromagnetic insulating layer is made of a conductive polymer, it can conform particularly well to the contours of the housing wall.

[0048] The electromagnetically insulating layer can have a thickness ranging from 0.1 mm to 3 mm, preferably from 0.5 mm to 2 mm, and more preferably from 0.2 mm to 0.5 mm. This allows the electromagnetically insulating layer to be designed in a particularly space-saving manner, which offers advantages with regard to the installation space of the battery housing component.

[0049] Preferably, the electromagnetically insulating layer consists of a corrosion-resistant material or has a corrosion protection coating. The housing wall can be a structural component of the battery housing component, which partially delimits a receiving space formed by the traction battery housing. The housing wall can at least partially delimit a receiving space for accommodating a plurality of battery components.

[0050] According to an advantageous embodiment, the electrically conductive seal is fixed to the first fluid seal and / or to the second fluid seal.

[0051] This allows the electrically conductive seal to be positioned in a particularly space-saving manner on the rest of the battery housing component, which offers advantages in terms of the battery housing component's installation space. Furthermore, this design offers the advantage that the electrically conductive seal and the first fluid seal and / or the second fluid seal provide improved mutual support, thus reducing the width of each seal and consequently reducing their contact area on the connection device.

[0052] The fact that the electrically conductive seal is fixed to the first fluid seal and / or the second fluid seal can mean that a relative movement between the electrically conductive seal and the first fluid seal and / or the second fluid seal is prevented.

[0053] According to an advantageous embodiment, the fixing is achieved by means of a positive-locking connection.

[0054] This can enable a particularly space-saving fixing, which offers advantages in terms of the installation space of the battery housing component. A positive-locking connection can be a connection in which the transmission of forces and moments occurs through the geometric shape of the connected parts, without the need for friction or additional connecting elements such as screws or adhesives.

[0055] According to an advantageous embodiment, the first fluid seal and / or the second fluid seal consists of a hardened casting medium.

[0056] This allows the first fluid seal and / or the second fluid seal to be arranged in a particularly space-saving manner on the electrically conductive seal, resulting in advantages regarding the installation space of the battery housing component. Furthermore, in the case of a positive-locking connection between the electrically conductive seal and the first and / or second fluid seal, this connection can be created particularly efficiently and in a space-saving manner.

[0057] A hardened casting medium can be a medium that is pourable at the time of application and is no longer pourable at the time the traction battery housing is finished.

[0058] The hardened casting medium may be pourable at the time of application and no longer pourable after a predetermined time has elapsed and / or after heating or cooling to a predetermined temperature.

[0059] Castable can describe the property of a material, in particular an alloy or a plastic, to possess sufficient viscosity to be poured into a mold. According to an advantageous embodiment, the cured casting medium is a polyurethane foam or a silicone foam. In particular, the cured casting medium is a polyurethane or silicone FIPFG (Finished Injectable Forming Mold).

[0060] This allows for a particularly efficient seal and thus excellent corrosion protection. In this way, the fluid seals can be made especially narrow, resulting in advantages regarding the installation space of the battery housing component.

[0061] The polyurethane foam, silicone foam and / or FIPFG are preferably closed-cell. This allows for a particularly efficient seal and thus an advantage in terms of the installation space required for the battery housing component.

[0062] The polyurethane foam, the silicone foam and / or the FIPFG are preferably thermally curing.

[0063] The polyurethane foam, the silicone foam and / or the FIPFG can preferably be applied in the desired shape using a nozzle.

[0064] The polyurethane foam, the silicone foam and / or the FIPFG are preferably porous inside and have a closed top layer on their surface.

[0065] According to an advantageous embodiment, the height extent of the electrically conductive seal is greater than the width extent of the electrically conductive seal.

[0066] This allows for the realization of a particularly space-saving electrically conductive seal, resulting in advantages regarding the installation space of the battery housing component. The width of the electrically conductive seal is defined as its extent in a direction parallel to the surface of the connecting element. Specifically, the width of the electrically conductive seal is defined as its extent in a direction parallel to the surface of the connecting element at a point of contact between the electrically conductive seal and the connecting element. In particular, the width is perpendicular to the height and length.

[0067] According to an advantageous embodiment, the electrically conductive seal has a rectangular, triangular or trapezoidal cross-section.

[0068] This allows the electrically conductive seal to be designed in a particularly space-saving manner, resulting in advantages regarding the installation space of the battery housing component.

[0069] The cross-section of the electrically conductive seal can be defined in a plane that is perpendicular to the longitudinal extent of the electrically conductive seal.

[0070] According to an advantageous embodiment, the electrically conductive seal comprises a spirally wound wire, a metal mesh, a conductive textile or a metal knit.

[0071] This allows the electrically conductive seal to be designed in a particularly space-saving manner, resulting in advantages regarding the installation space of the battery housing component. Furthermore, in a suitably designed battery housing component, the electrically conductive seal to the connection element, especially to an electromagnetically insulating layer, exhibits improved contact, thereby achieving enhanced protection against incoming and outgoing electromagnetic radiation.

[0072] A metal mesh can be a structure consisting of interwoven or woven metal wires.

[0073] A metal knit can be a structure produced using a circular knitting process with metal wires.

[0074] Conductive textiles can be textile materials that can conduct electricity. They can be produced by incorporating electrically conductive fibers (e.g., made of metals such as silver, copper, aluminum, steel, or stainless steel) or by coating textile fibers with conductive materials such as graphene, carbon nanotubes, or conductive polymers.

[0075] According to an advantageous embodiment, the electrically conductive seal has a cavity.

[0076] This allows the electrically conductive seal to adapt particularly well to the geometry of the rest of the battery housing component, resulting in advantages in terms of the installation space of the battery housing component.

[0077] Preferably, the cavity is tubular. This results in particularly good adaptability.

[0078] According to an advantageous embodiment, the electrically conductive seal has a support element. The support element is arranged at least partially within the cavity of the electrically conductive seal.

[0079] This increases the stability of the electrically conductive seal. Furthermore, it increases the permeability of the electrically conductive seal, thus providing enhanced electromagnetic shielding. This allows the electrically conductive seal to be smaller, potentially offering advantages in terms of the installation space required for the battery housing component.

[0080] The support element preferably consists of an elastomer, a foam and / or a braid.

[0081] The present invention also aims to provide a method for manufacturing a battery housing component which enables a particularly small installation space requirement for the battery housing component.

[0082] The problem underlying the present invention is solved by a method for manufacturing a previously described battery housing component, wherein the method comprises the following steps:

[0083] Arranging an electrically conductive seal in the area of ​​the connection device of the battery housing component, applying a casting medium to the connection device and next to the electrically conductive seal in such a way that the casting medium comes into direct contact with the electrically conductive seal over at least 50% of the height extent of the electrically conductive seal, curing of the casting medium.

[0084] In this way, the advantage is achieved that the fluid seal, which is formed from the solidified casting medium, lies particularly close to the electrically conductive seal, thereby reducing the width of the fluid seal and saving installation space.

[0085] The placement of an electrically conductive seal in the area of ​​the connection device of the battery housing component may also include the temporary fixing of the electrically conductive seal.

[0086] The application of a casting medium includes all necessary steps to provide the casting medium in such a way that the casting medium comes into direct contact with the electrically conductive seal over at least 50% of the height extent of the electrically conductive seal.

[0087] Preferably, the method is designed such that when applying the casting medium to the connecting device and next to the electrically conductive seal, the casting medium comes into direct contact with the electrically conductive seal over at least 60%, more preferably over at least 70%, more preferably over at least 80%, more preferably over at least 90% and more preferably over the entire height of the electrically conductive seal.

[0088] The process can, of course, include further steps. For example, the process can include steps for removing part of a housing wall in the area of ​​the connection device of the battery housing component, thereby exposing part of an electromagnetically insulating layer for contact. Furthermore, the process can include steps to aid curing, such as heating or rinsing with a fluid, particularly a gaseous one.

[0089] According to an advantageous embodiment of the method, the casting medium is applied using an application nozzle. During application, the application nozzle is positioned partially overlapping the electrically conductive seal with the surface of the connection device. This allows the fluid seal to be positioned even closer to the electrically conductive seal, thereby saving further installation space.

[0090] Referring to the surface of the connection device, this means that the application nozzle, viewed from above perpendicular to the surface, is arranged partially overlapping the electrically conductive seal. In particular, this can mean that the part of the application nozzle which has an outlet opening is arranged partially overlapping the electrically conductive seal.

[0091] The present invention also aims to provide a traction battery housing that is particularly compact.

[0092] The problem underlying the present invention is solved by a traction battery housing for a motor vehicle, comprising a battery housing component according to the invention as described above, and at least one second battery housing component. The first battery housing component and the at least second battery housing component together form a receiving volume for receiving at least one battery component.

[0093] This allows for a particularly compact traction battery housing.

[0094] The second battery housing component is preferably also a previously described battery housing component according to the invention.

[0095] Preferably, the traction battery housing is designed for a traction battery of an electrically powered motor vehicle. Preferably, the traction battery housing is mountable on the body of a motor vehicle.

[0096] The present invention also aims to provide a traction battery that is particularly compact.

[0097] This problem underlying the present invention is solved by a traction battery for a motor vehicle, comprising a traction battery housing as described above and at least one battery component arranged in a receiving volume of the traction battery housing.

[0098] This allows for the provision of a particularly compact traction battery.

[0099] The traction battery can be designed to be attached to a motor vehicle, in particular to the body of a motor vehicle.

[0100] The present invention also aims to provide a motor vehicle which has a particularly long range.

[0101] This problem underlying the present invention is solved by a motor vehicle comprising a traction battery as described above.

[0102] This allows for the use of a particularly space-saving traction battery, which in turn allows it to be designed larger, thus increasing the vehicle's range.

[0103] Further advantages, details, and features of the invention will become apparent from the exemplary embodiments described below. Specifically, the following will be shown:

[0104] Figure 1: a first battery housing component and a second battery housing component as known from the prior art;

[0105] Figure 2: a first battery housing component and a second battery housing component according to the invention in a first embodiment;

[0106] Figure 3: a first battery housing component according to the invention and a second battery housing component in a second embodiment;

[0107] Figure 4: a first battery housing component according to the invention and a second battery housing component in a third embodiment;

[0108] Figure 5: a traction battery housing with a first battery housing component and a second battery housing component according to the invention, wherein the fluid seal and the electrically conductive seal are shown only on one side for the sake of clarity;

[0109] Figure 6 ad: a cross-sectional view of electrically conductive seals in four different embodiments according to the invention; and

[0110] Figure 7ac: a method according to the invention for manufacturing a battery housing component.

[0111] In the following description, identical reference numerals denote identical components or identical features, so that a description given for a component in relation to one figure also applies to the other figures, thus avoiding repetitive descriptions. Furthermore, individual features described in connection with one embodiment can also be used separately in other embodiments.

[0112] Figure 1 shows a battery housing component 100 not according to the invention, as is known from the prior art.

[0113] The battery housing component 100 has a fluid seal 102 and an electrically conductive seal 103.

[0114] For technical reasons, the fluid seal 102 has an almost teardrop-shaped form.

[0115] The electrically conductive seal 103 is attached to the housing wall of the battery housing component 100 by means of an adhesive 104. Since the adhesive 104 would interrupt the electrically conductive connection between the electrically conductive seal 103 and an electromagnetically insulating layer of the housing wall (not shown here), the electrically conductive seal 103 has a laterally projecting protrusion by means of which the electrically conductive seal 103 is connected to the housing wall by means of the adhesive 104.

[0116] It is evident that, due to the trapezoidal shape of the fluid seal 102 and the laterally projecting mounting projection of the electrically conductive seal 103, the available installation space is used inefficiently.

[0117] Figure 2 shows a first embodiment of a first battery housing component 10 according to the invention, which is already connected here to a second battery housing component 20 to form a battery housing 1, which is only partially shown. The battery housing component 10 has a housing wall 14, which in the embodiment shown here surrounds an electromagnetically insulating layer 13. At the outer edge of the battery housing component 10, it has a circumferential connecting device 11 for connection to a second battery housing component 20. The connecting device 11 is designed here as a flange 11.

[0118] The battery housing component 10, in particular the housing wall 14 of the battery housing component 10, has a fiber-reinforced plastic or consists entirely of such a plastic.

[0119] The battery housing component 10 has a first fluid seal 30 arranged circumferentially in the area of ​​the connection device 11. The first fluid seal 30 consists of a cured casting medium 60. The cured casting medium is a polyurethane (PU) FIPFG.

[0120] The battery housing component 10 also has an electrically conductive seal 40 arranged circumferentially in the area of ​​the connecting element 11. The electrically conductive seal 40 is arranged in a circumferential groove 12 of the connecting element 11 of the battery housing component 10. The electrically conductive seal 40 is in electrically conductive contact with the electromagnetically insulating layer 13. The electrically conductive seal 40 can be made of a corrosion-resistant material and / or has a corrosion protection coating.

[0121] The first fluid seal 30 is in direct contact with the electrically conductive seal 40 over most of its height 43. This eliminates the gap between the fluid seal 102 and the electrically conductive seal 103 known from the prior art. The electrically conductive seal 40 is fixed to the first fluid seal 30 by means of a positive-locking connection. In another embodiment, the electrically conductive seal 40 is adhesively fixed to the first fluid seal 30.

[0122] The electrically conductive seal 40 is positioned internally with respect to the first fluid seal 30.

[0123] It can be seen that the height extent 43 of the electrically conductive seal 40 is greater than the width extent of the electrically conductive seal 40.

[0124] Figure 3 shows a second embodiment of a first battery housing component 10 according to the invention, which here is already connected to a second battery housing component 20 to form a battery housing 1 which is only partially shown.

[0125] In this second embodiment, the battery housing component 10 has a second fluid seal 50, which is arranged circumferentially in the area of ​​the connection device 11. The electrically conductive seal 40 is arranged between the first fluid seal 30 and the second fluid seal 50. The electrically conductive seal 40 is fixed to the first fluid seal 30 and to the second fluid seal 50 by means of a positive-locking connection.

[0126] In this second embodiment, the battery housing component 10 also lacks an electromagnetically insulating layer 13. Instead, the housing wall 14 is made of a metal. The same applies to the housing wall 24 of the second battery housing component 20.

[0127] Of course, it would also be possible that the battery housing component 10, as in the first embodiment, has a plastic and an electromagnetically insulating layer 13, which is exposed in the connection area with the electrically conductive seal 40.

[0128] Figure 4 shows a third embodiment of a first battery housing component 10 according to the invention, which here is already connected to a second battery housing component 20 to form a battery housing 1 which is only partially shown.

[0129] In this third embodiment, the electrically conductive seal 40 is trapezoidal and tapers upwards, so that the first fluid seal 30 and the second fluid seal 50 conform to the chamfered outer surfaces of the electrically conductive seal 40. This results in the first fluid seal 30 and the second fluid seal 50 overlapping the electrically conductive seal 40 with respect to its base. It would, of course, also be possible to omit the second fluid seal 50.

[0130] Figure 5 shows an embodiment of a traction battery housing 1 according to the invention, wherein the two fluid seals 30, 50 and the electrically conductive seal 40 are shown only on one side for the sake of clarity.

[0131] The traction battery housing 1 comprises a first battery housing component 10 according to the invention and a second battery housing component 20, which is not according to the invention. The second battery housing component 20 is also designed according to the invention in a further embodiment not shown here.

[0132] The first battery housing component 10 and the second battery housing component 20 together form a receiving volume 2 in which several battery components 3 are arranged. The battery components 3 can be designed as battery modules and / or as battery cells.

[0133] The first battery housing component 10 and the second battery housing component 20 are connected to each other in the area of ​​their respective connecting devices 11, 21. In the embodiment shown here, both the first battery housing component 10 and the second battery housing component 20 each have an electromagnetically insulating layer 13, 23 and also each have a groove 12, 22, so that the electrically conductive seal 40 is in electrical contact with both insulating layers 13, 23.

[0134] Figure 6 shows in image parts a) to d) four embodiments of an electrically conductive seal 40 according to the invention in cross-section .

[0135] In part a) of the image, the electrically conductive seal 40 has a circular cross-sectional shape. It thus surrounds a cavity 41 in a tubular shape, in which, however, no further element is yet arranged in this embodiment.

[0136] The electrically conductive seal here consists of a spirally wound wire, a metal mesh, a conductive textile or a metal knit.

[0137] In part b) of the image, another conductive seal 40 with a circular cross-sectional shape and a cavity 41 is shown. In this embodiment, however, a support element 42 is arranged in the cavity.

[0138] The support element 42 consists of an elastomer.

[0139] Figure c) shows another embodiment of an electrically conductive seal 40 according to the invention. In this embodiment, the electrically conductive seal 40 has a rectangular cross-section. Although not shown, a support element as shown in figure b) can also be arranged in the cavity of this seal 40.

[0140] Figure d) shows another embodiment of an electrically conductive seal 40 according to the invention. In this embodiment, the electrically conductive seal 40 has a trapezoidal cross-section. Although not shown, a support element as shown in figure b) can also be arranged in the cavity of this seal 40.

[0141] Figure 7 shows the different manufacturing stages of a battery housing component 10 according to the invention according to a manufacturing method according to the invention.

[0142] In part a) of the image, a portion of the battery housing component 10 is shown, consisting of the housing wall 14 with an electromagnetically insulating layer 13 surrounded by it and an electrically conductive seal 40 arranged on the housing wall 14. This corresponds to the manufacturing state after the first process step "arranging an electrically conductive seal 40 in the area of ​​the connection device 11 of the battery housing component 10".

[0143] Figure b) shows how a casting medium 60 is applied to the connecting device 11 and next to the electrically conductive seal 40 by means of an application nozzle 70 such that the casting medium 60 comes into direct contact with the electrically conductive seal 40 over at least 50% of its height 43. Figure c) shows the completed manufacturing state. In this state, the casting medium 60 has hardened and now forms the first fluid seal 30. Reference numeral list

[0144] 1 Traction battery housing

[0145] 2 Recording volume

[0146] 3 Battery component

[0147] 10, 20 Battery housing component

[0148] 11, 21 Connection device

[0149] 12, 22 Nut

[0150] 13, 23 electromagnetic insulating layer

[0151] 14, 24 Housing wall

[0152] 30 First fluid seal

[0153] 40 Electrically conductive seal

[0154] 41 Cavity

[0155] 42 Support element

[0156] 43 Height extension (of the electrically conductive seal) 50 Second fluid seal

[0157] 60 Casting medium

[0158] 70 Application nozzle

[0159] 100 First battery housing component (state of the art) 101 Second battery housing component (state of the art) 102 Fluid seal (state of the art)

[0160] 103 Electrically conductive seal (state of the art) 104 Adhesive (state of the art)

Claims

Patent claims 1. Battery housing component ( 10, 20) for a traction battery housing ( 1 ) for receiving at least one battery component (3) , wherein the battery housing component ( 10, 20) has a circumferential connecting device ( 11, 21 ) for connection with a second battery housing component ( 10, 20), wherein the battery housing component ( 10, 20) has a first fluid seal (30) arranged circumferentially in the area of ​​the connecting device ( 11, 21 ) and an electrically conductive seal (40) arranged circumferentially in the area of ​​the connecting device ( 11, 21 ), wherein the first fluid seal (30) is in direct contact with the electrically conductive seal (40) over at least 50% of a height extension (43) of the electrically conductive seal (40), and wherein the electrically conductive seal (40) is positioned internally with respect to the first fluid seal (30).

2. Battery housing component (10, 20) according to claim 1, characterized in that the battery housing component (10, 20), in particular the connecting device (11, 21), has a circumferential groove (12, 22), wherein the electrically conductive seal (40) is arranged in the groove (12, 22). Battery housing component (10, 20) according to one of claims 1 or 2, characterized in that the electrically conductive capable seal (40) consists of a corrosion-resistant material and / or has corrosion protection .

4. Battery housing component ( 10, 20) according to one of claims 1 to 3, characterized in that the battery housing component ( 10, 20) has a second fluid seal (50) which is arranged circumferentially in the area of ​​the connecting device ( 11, 21 ), wherein the electrically conductive seal (40) is arranged between the first fluid seal (30) and the second fluid seal (50 ).

5. Battery housing component ( 10, 20) according to one of claims 1 to 4, characterized in that the battery housing component ( 10, 20) comprises a plastic, preferably fiber-reinforced.

6. Battery housing component ( 10, 20) according to one of claims 1 to 5, characterized in that, that the battery housing component (10, 20) has an electromagnetically insulating layer (13, 23), wherein the electromagnetically insulating layer (13, 23) is in direct electrically conductive contact with the electrically conductive seal (40), wherein the battery housing component (10, 20) preferably has a housing wall (14, 24) and the electromagnetically insulating layer (13, 23) is at least partially surrounded by the housing wall (14, 24).

7. Battery housing component ( 10, 20) according to one of claims 1 to 6, characterized in that the electrically conductive seal (40) is fixed to the first fluid seal (30) and / or to the second fluid seal (50), preferably in a form-fitting manner.

8. Battery housing component ( 10, 20) according to one of claims 1 to 7, characterized in that the first fluid seal (30) and / or the second fluid seal (50) consists of a hardened casting medium ( 60 ).

9. Battery housing component ( 10, 20) according to claim 8, characterized in that the cured casting medium ( 60) is a polyurethane foam or a silicone foam, in particular a FIPFG made of polyurethane or silicone.

10. Battery housing component ( 10, 20) according to one of claims 1 to 9, characterized in that the height extent (43) of the electrically conductive seal (40) is greater than a width extent of the electrically conductive seal (40) .

11. Battery housing component ( 10, 20) according to one of claims 1 to 10, characterized in that the electrically conductive seal (40) has a rectangular, triangular or trapezoidal cross-section.

12. Battery housing component ( 10, 20) according to one of claims 1 to 11, characterized in that the electrically conductive seal (40) comprises a spirally wound wire, a metal mesh, a conductive textile or a metal knit.

13. Battery housing component ( 10, 20) according to one of claims 1 to 12, characterized in that the electrically conductive seal (40) has a cavity (41 ).

14. Battery housing component (10, 20) according to claim 13, characterized in that the electrically conductive seal (40) has a support element (42) and the The support element (42) is arranged at least partially in the cavity (41) of the electrically conductive seal (40).

15. Method for manufacturing a battery housing component ( 10, 20) according to one of claims 1 to 14, characterized in that the method comprises the following steps: Arranging an electrically conductive seal (40) in the area of ​​the connection device ( 11, 21 ) of the battery housing component ( 10, 20) , Applying a casting medium ( 60) to the connecting device ( 11, 21 ) and next to the electrically conductive seal (40) such that the casting medium ( 60) comes into direct contact with the electrically conductive seal (40) over at least 50% of the height extension (43) of the electrically conductive seal (40), Curing of the casting medium ( 60) .

16. Method according to claim 15, characterized in that the casting medium (32 ) is applied by means of an application nozzle (70), wherein the application nozzle (70) is arranged during application partially overlapping with the electrically conductive seal (40) with respect to the surface of the connecting device ( 11, 21 ).

17. Traction battery housing ( 1 ) for receiving a traction battery, comprising at least one first battery housing component ( 10, 20 ) according to one of claims 1 to 14 and at least one second battery housing component, wherein the first battery housing component ( 10, 20 ) and the at least second battery housing component together form a receiving volume (2 ) for receiving at least one battery component (4 ).

18. Traction battery for a motor vehicle, comprising a traction battery housing ( 1 ) according to claim 17 and at least one battery component ( 4 ) which is arranged in the receiving volume ( 2 ) of the traction battery housing ( 1 ).

19. Motor vehicle comprising a traction battery according to claim 18.

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