BATTERY HOUSING COMPONENT FOR A TRACTION BATTERY FOR COOLING AT LEAST ONE BATTERY COMPONENT

Description

[0001] The present invention relates to a battery housing component for a traction battery for cooling at least one battery component and to methods for manufacturing it. Furthermore, the present invention relates to a traction battery housing for receiving at least one battery component in a receiving volume of the traction battery housing, a traction battery for a motor vehicle, and a motor vehicle with a traction battery.

[0002] Traction batteries for motor vehicles contain battery components, such as battery cells and / or battery modules, housed within a battery casing. These components are used to store and release electrical energy. Heat is generated during both the charging and discharging of these battery components. Since the battery components have a thermal operating window within which charging and discharging function optimally, the heat generated by the battery components must be dissipated through the battery casing.

[0003] To dissipate the heat energy emitted by the battery components, it is known to provide cooling fluid channels in a battery housing shell for the purpose of conveying a cooling fluid, which are indirectly thermally coupled to the battery components. Such cooling channels are, for example, arranged in a cooling plate made of a metal, onto which the battery components are placed.

[0004] However, with battery housings made of plastic, the problem is that it is difficult to make the cooling fluid channels arranged within the battery casing completely fluid-tight. Especially under overpressure in the cooling fluid channels, these tend to leak, allowing the cooling fluid to come into contact with the battery components and potentially causing irreparable damage.

[0005] Furthermore, the known battery housings have a design and material composition that, under the influence of intense mechanical and / or thermal stresses, provides reduced protection against coolant leakage. The battery housing components known from the prior art are therefore prone to leakage under certain loads.

[0006] German patent DE 10 2019 205 422 A1 describes an underride guard with a receiving area for at least one battery module. The underride guard has a base consisting of a multi-layered plastic plate with at least two layers. The first side of the plastic plate, facing the receiving area, has a coolant channel which is covered by a plastic film, so that the plastic film and the coolant channel form a cooling channel.

[0007] US 2020 / 0153056 A1 describes an accumulator with at least one storage module for electrical energy and at least one cooling device for cooling or temperature control of the at least one storage module, wherein the cooling device has a single- or multi-layered film and is in contact with the at least one storage module with this film.

[0008] DE 10 2016 103 411 A1 describes a battery device for an electric vehicle with a plurality of battery modules and at least one receiving device for receiving the battery modules, wherein the receiving device comprises a multi-layered composite plate arranged below the battery modules, which is provided by several partially interconnected layer components, wherein the composite plate is designed for connecting the battery modules and includes a flow path for a cooling medium of a cooling device for the battery modules and provides a bottom protection wall to protect the battery modules when driving over obstacles.

[0009] JP 2021 501972 A1 describes a battery housing for a traction battery with a housing shell made at least partially of thermoplastic material, which has a receiving area for inserting a traction battery. The housing shell has a wall with a multi-layered sandwich structure. At least one first layer of the sandwich structure is spaced at least partially apart from a second layer of the sandwich structure, so that a wall cavity is formed between the first and second layers, the wall cavity being designed to store and / or distribute a cooling medium.

[0010] DE 10 2020 125 387 A1 describes a device for cooling or temperature control of a storage module of a rechargeable battery, wherein the device comprises a first multilayer film having two plastic layers and an electrically conductive layer arranged between the plastic layers, or a plastic layer, a reinforcing layer, and an electrically conductive layer arranged between the plastic layer and the reinforcing layer, and forming at least a partial coolant channel for a cooling fluid, wherein the electrically conductive layer is partially exposed. The present invention is based on the objective of providing a battery housing component for a traction battery for cooling a battery component, which offers improved protection against the leakage of a cooling fluid.

[0011] The problems underlying the present invention are solved by a battery housing component having the features of claims 1 or 7. Advantageous embodiments are described in the dependent claims.

[0012] More precisely, the problem underlying the present invention is solved by a battery housing component for a traction battery for cooling at least one battery component. The housing component comprises a base component made of a first plastic, a fiber-reinforced connecting component having an inner surface and an outer surface, and a multilayer film. The multilayer film has a connecting surface and a contact surface, the contact surface being designed for at least indirect contact with the at least one battery component. The fiber-reinforced connecting component is arranged in a sandwich-like manner between the base component and the multilayer film, with an inner surface of the base component being bonded to the inner surface of the connecting component.The bonding surface of the multilayer film is materially bonded to the outer surface of the fiber-reinforced connecting component by means of a bonding layer made of a fiberless thermoplastic polymer, forming at least one cooling fluid channel arranged between the multilayer film and the connecting component for the conveyance of a cooling fluid.

[0013] The battery housing component according to the invention has the advantage that the at least one cooling fluid channel is more robust, as it can withstand higher pressures within the cooling fluid channel. By providing the bonding layer arranged between the multilayer film and the connecting component made of a fiberless thermoplastic material, the material-bonded connection between the multilayer film and the fiber-reinforced connecting component is more stable, so that the cooling fluid channel can withstand higher pressures. The material-bonded connection between the multilayer film and the connecting component is a media-tight connection.Thus, the operational reliability of a traction battery in which the battery housing component according to the invention is installed is increased, since battery housing components installed in the traction battery, such as battery cells and / or battery modules, are better protected from contact with the cooling fluid transported in the at least one cooling fluid channel. Furthermore, the battery housing component according to the invention has a compact design due to the sandwich-like arrangement of the connecting element and is therefore advantageously space-saving.

[0014] The battery housing component is preferably designed as a battery housing shell. More preferably, the battery component is designed as underbody protection. It is also possible that the battery housing component is designed as a battery housing cover.

[0015] The first plastic component of the base part is preferably a thermoplastic. Preferably, the first plastic component comprises a polyolefin, in particular a polypropylene. More preferably, the first plastic component comprises a polyamide.

[0016] Preferably, the first plastic of the base component is a thermosetting plastic.

[0017] Preferably, the first plastic component of the base component is fiber-reinforced. The fiber material arranged in the first plastic preferably comprises glass fibers and / or carbon fibers and / or aramid fibers. The fiber material preferably comprises short fibers and / or long fibers.

[0018] The fiber-reinforced connecting component is preferably designed as a connecting plate. The fiber-reinforced connecting component preferably comprises a thermoplastic material. More preferably, the thermoplastic material comprises a polyolefin, in particular a polypropylene. More preferably, the thermoplastic material comprises a polyamide.

[0019] Preferably, the connecting component is made of a thermosetting plastic.

[0020] The fiber-reinforced connecting component preferably comprises glass fibers and / or carbon fibers and / or aramid fibers. The fiber material preferably comprises short fibers and / or long fibers and / or continuous fibers.

[0021] The material-bonded connection between the inner surface of the base component and the inner surface of the connecting component is preferably achieved by welding and / or bonding, particularly preferably by a hot plate welding process. More preferably, the material-bonded connection between the inner surface of the base component and the inner surface of the connecting component is achieved by overmolding (in injection molding) or overmolding (in compression molding).

[0022] The bonding layer, by means of which the multilayer film is materially bonded to the outer surface of the connecting component, preferably comprises a polyolefin, and more preferably a polypropylene.

[0023] The battery component is preferably a battery cell. More preferably, the battery component is a battery module.

[0024] At least one battery component is preferably brought into direct, i.e. immediate, contact with the multilayer film.

[0025] Preferably, the multilayer film has a contour that is at least partially adapted to the geometry of the battery components. The battery housing component with the correspondingly designed multilayer film is thus particularly compact and advantageously space-saving.

[0026] Furthermore, it is also possible that at least one battery component is brought into indirect contact with the multilayer film by means of a thermal paste. The thermal paste transfers the heat emitted by the battery component particularly efficiently, directly to the multilayer film and indirectly to the cooling fluid channel, thus providing particularly effective cooling of the battery component.

[0027] Since at least one cooling fluid channel is formed between the multilayer film and the connecting component, the connecting surface of the multilayer film is not fully bonded but is materially bonded to the outer surface of the fiber-reinforced connecting component in sections.

[0028] Preferably, the battery housing component has a cooling fluid inlet and a cooling fluid outlet, each of which leads into the cooling fluid channel.

[0029] Preferably, the battery housing component is designed such that the connecting component has an outer layer of the connecting component made of a fiberless thermoplastic material, which limits the outer surface of the connecting component, wherein the connecting layer is at least partially formed by the outer layer of the connecting component.

[0030] The specially designed battery housing component offers the advantage of an even more pressure-resistant fluid channel. Furthermore, this type of battery housing component is particularly easy to manufacture.

[0031] Preferably, the fiberless thermoplastic material comprises a polyolefin, in particular a polypropylene. More preferably, the fiberless thermoplastic material comprises a polyamide.

[0032] Of course, the outer layer of the connecting component can also consist of other thermoplastic materials or materials with similar material properties.

[0033] Particularly preferably, the outer layer of the connecting component and the connecting surface of the multilayer film have similar or identical material components and / or material properties, so that they can be joined together particularly advantageously in a materially bonded manner.

[0034] Preferably, the outer layer of the connecting component has a layer thickness of less than 1000 µm, preferably less than 800 µm, further preferably less than 600 µm, further preferably less than 400 µm, further preferably less than 300 µm, and particularly preferably less than 200 µm.

[0035] Preferably, the battery housing component is designed such that the connecting component has an inner layer of the connecting component made of a fiberless thermoplastic material and bounded by the inner surface of the connecting component, wherein the base component is materially bonded to the fiber-reinforced connecting component by means of the inner layer of the connecting component.

[0036] The battery housing component designed accordingly has the advantage of being particularly easy to manufacture. Furthermore, due to the fiber-free thermoplastic material, the battery housing component designed accordingly exhibits improved mechanical stability, in particular improved stiffness and strength, since the bond between the base component and the connecting component is not permeated with fibers that could weaken the connection.

[0037] Preferably, the fiberless thermoplastic material comprises a polyolefin, in particular a polypropylene. More preferably, the fiberless thermoplastic material comprises a polyamide.

[0038] Preferably, the fiber-free thermoplastic is a thermosetting plastic. Of course, the inner layer of the connecting component can also be made of other thermoplastic materials or materials with similar properties.

[0039] Particularly preferably, the inner layer of the connecting component and the connecting surface of the multilayer film have similar or identical material components and / or material properties, so that they can be joined together particularly advantageously in a materially bonded manner.

[0040] Preferably, the inner layer of the connecting component has a layer thickness of less than 1000 µm, preferably less than 800 µm, more preferably less than 600 µm, more preferably less than 400 µm, more preferably less than 300 µm, and particularly preferably less than 200 µm.

[0041] Preferably, the battery housing component is designed such that the connecting component has a central layer that is arranged between the connecting component inner layer and the connecting component outer layer, wherein the central layer comprises fiber material which is arranged in a plastic material matrix.

[0042] The appropriately designed battery housing component exhibits further improved mechanical stability. Furthermore, the appropriately designed battery housing component offers improved protection and improved mechanical stability under thermal stress. A central layer made of a fiber material, in particular a continuous fiber-reinforced fiber material, arranged in a polymer matrix, advantageously retains its mechanical stability to a substantial extent even when the polymer matrix (e.g., a thermoplastic polymer as described above) in which the fiber material is embedded softens or even liquefies due to heat input.

[0043] The fiber material preferably comprises glass fibers and / or aramid fibers and / or carbon fibers and / or other synthetic fibers.

[0044] Preferably, the central layer, the outer surface of the connecting component, and the inner surface of the connecting component form a cross-ply, with the central layer arranged in a sandwich-like manner between the outer surface and the inner surface of the connecting component. The cross-ply allows for particularly advantageous joining of this cross-ply with the multilayer film and the base component to form the battery housing component according to the invention. Furthermore, the sandwich-like arrangement of the central layer results in a compact design for the battery housing component according to the invention, thus advantageously saving space.

[0045] Preferably, the battery housing component is designed such that the fiber material has unidirectionally oriented fibers.

[0046] The appropriately designed battery housing component, in which unidirectional fibers are used as the fiber material of the central layer, exhibits a further improved mechanical stability, in particular improved stability against loads that act orthogonally to the direction of the fibers.

[0047] The unidirectional fibers of the central layer, in the context of the battery housing component according to the invention, are fibers that run or are oriented completely or predominantly in a single direction. The fibers are assumed to be ideally parallel and homogeneously distributed. The unidirectional fibers advantageously exhibit transversely isotropic material properties, resulting in the central layer having a comparatively low density and comparatively high strength in one load direction.

[0048] Preferably, the battery housing component is designed such that the fiber material has multidirectional fibers.

[0049] The correspondingly designed battery housing component exhibits further improved properties, in particular a comparatively high stiffness, tensile strength, and vibration resistance, combined with a comparatively low weight. Furthermore, the central layer with multidirectional fibers advantageously displays improved delamination and impact resistance.

[0050] The multidirectional fibers of the central layer, according to the invention, are fibers that are not predominantly unidirectionally oriented. The individual fibers or fiber groups do not run parallel, but are offset from each other at an angle. This offset angle can be, for example, 45°, 60°, or 90°.

[0051] Preferably, the multidirectional fibers of the fiber material of the central layer are arranged in a checkerboard pattern with an offset angle of 90° to each other.

[0052] Preferably, the multidirectional fibers also have further offset angles and / or a combination of several different offset angles to each other.

[0053] The problems underlying the present invention are further solved by a battery housing component having the features of claim 7. Advantageous embodiments are described in the dependent claims.

[0054] More precisely, the problem underlying the present invention is solved by a battery housing component for a traction battery for cooling at least one battery component, comprising a base component made of a first plastic and a multilayer film, wherein the multilayer film has a bonding surface and a contact surface, the contact surface being designed for at least indirect contact with the at least one battery component. The bonding surface of the multilayer film is metallurgically connected to an inner surface of the base component by forming at least one cooling fluid channel arranged between the multilayer film and the base component for conveying a cooling fluid by means of a bonding layer made of a fiberless thermoplastic.

[0055] The battery housing component according to the invention has the advantage that at least one cooling fluid channel exhibits increased stability, as it can withstand comparatively higher pressures within the cooling fluid channel. Thus, the operational reliability of a traction battery in which the battery housing component according to the invention is installed is increased.

[0056] The battery housing component installed in the traction battery, as well as, for example, battery cells and / or battery modules, are also better protected against a cooling fluid located in the cooling fluid channel.

[0057] The battery housing component is preferably designed as a battery housing shell. More preferably, the battery component is designed as underbody protection. It is also possible that the battery housing component is designed as a battery housing cover.

[0058] The first plastic component of the base part is preferably a thermoplastic. Preferably, the first plastic component comprises a polyolefin, in particular a polypropylene. More preferably, the first plastic component comprises a polyamide.

[0059] Preferably, the first plastic of the base component is a thermosetting plastic.

[0060] Preferably, the first plastic component of the base component is fiber-reinforced. The fiber material arranged in the first plastic preferably comprises glass fibers and / or carbon fibers and / or aramid fibers. The fiber material preferably comprises short fibers and / or long fibers.

[0061] The material-bonded connection between the inner surface of the base component and the inner surface of the connecting component is preferably achieved by welding and / or bonding, particularly preferably by a hot plate welding process. More preferably, the material-bonded connection between the inner surface of the base component and the inner surface of the connecting component is achieved by overmolding (in injection molding) or overmolding (in compression molding).

[0062] The bonding layer, by means of which the multilayer film is materially bonded to the inner surface of the base component, preferably comprises a polyolefin, and more preferably a polypropylene.

[0063] The battery component is preferably a battery cell. More preferably, the battery component is a battery module.

[0064] At least one battery component is preferably brought into direct, i.e. immediate, contact with the multilayer film.

[0065] Preferably, the multilayer film has a contour that is at least partially adapted to the geometry of the battery components. The battery housing component with the correspondingly shaped multilayer film is thus particularly compact.

[0066] Furthermore, it is also possible that at least one battery component is brought into indirect contact with the multilayer film by means of a thermal paste. The thermal paste transfers the heat emitted by the battery component particularly efficiently, directly to the multilayer film and indirectly to the cooling fluid channel, thus providing particularly effective cooling of the battery component.

[0067] Since at least one cooling fluid channel is formed between the multilayer film and the connecting component, the connecting surface of the multilayer film is not fully bonded but is materially bonded to the outer surface of the fiber-reinforced connecting component in sections.

[0068] Preferably, the battery housing component has a cooling fluid inlet and a cooling fluid outlet, each of which leads into the cooling fluid channel.

[0069] Preferably, the battery housing component is designed such that the multilayer film has an insulating layer and a structural layer connected to it, wherein the contact surface of the multilayer film limits the insulating layer.

[0070] The appropriately designed battery housing component features improved electrical insulation due to the insulating layer, thus providing particularly advantageous protection against electrical influences in a traction battery in which this component is installed. Such electrical influences can be caused, for example, by localized static charges on the battery housing component or by undesirable, age-related electrical defects in the battery component to which the battery housing component according to the invention is exposed. The insulating layer therefore makes the battery housing component particularly reliable in operation.

[0071] In light of the battery housing component according to the invention, the insulating layer is a layer made of a plastic. Preferably, the insulating layer comprises a thermoplastic material.

[0072] Preferably, the insulating layer has an adhesion layer by means of which the insulating layer can be particularly advantageously bonded to the structural layer.

[0073] The insulating layer has a thickness of less than 100 µm, preferably less than 50 µm, particularly preferably less than 20 µm.

[0074] In light of the battery housing component according to the invention, the structural layer is a layer made of a metallic material. Preferably, the structural layer comprises aluminum, steel, or copper.

[0075] The structural layer can also be referred to as a thermal conductivity layer. This is because the structural layer serves to improve heat transfer to a cooling fluid circulating in the cooling fluid channel.

[0076] Preferably, the structural layer has a layer thickness of less than 200 µm, preferably less than 100 µm, and particularly preferably less than 80 µm.

[0077] Preferably, the battery housing component is designed such that the multilayer film has a bonding layer, wherein the structural layer is arranged sandwich-like between the insulating layer and the bonding layer, and wherein the bonding layer is at least partially formed by the bonding layer.

[0078] The appropriately designed battery housing component offers the advantage that the multilayer film can be bonded particularly effectively to the inner surface of the base component or to the outer surface of the connecting component via the bonding layer. Furthermore, the appropriately designed battery housing component is particularly easy to manufacture.

[0079] The bonding layer preferably comprises a thermoplastic material. More preferably, the thermoplastic material of the bonding layer comprises a polyolefin, in particular a polypropylene. More preferably, the thermoplastic material comprises a polyamide.

[0080] The material-bonded connection between the joining layer and the inner surface of the base component is preferably realized by welding and / or bonding, particularly preferably by a hot plate welding process, wherein the joining layer is at least partially formed by the joining layer.

[0081] Preferably, the battery housing component is designed such that the base component has reinforcing ribs on an outer surface of the base component that faces away from an inner surface of the base component.

[0082] The appropriately designed battery housing component exhibits further improved stiffness and strength, while reducing the weight of the battery housing component.

[0083] Alternatively or in addition to the reinforcing ribs, reinforcing honeycomb structures can also be arranged on the outer surface of the base component.

[0084] Preferably, the reinforcing ribs or honeycomb structures are integrated into the base component. More preferably, the reinforcing ribs or honeycomb structures are formed monolithically with the base component. Alternatively, the reinforcing ribs or honeycomb structures are attached to the outside of the base component.

[0085] The reinforcing ribs or honeycomb structures are preferably fiber-reinforced, preferably with short fibers and / or long fibers and / or continuous fibers. Furthermore, the reinforcing ribs or honeycomb structures are preferably welded and / or bonded to the outer surface of the base component.

[0086] Preferably, the battery housing component is designed such that the battery housing component has a protective plate which is connected to the outer surface of the base component.

[0087] The specially designed battery housing component exhibits further improved rigidity. Furthermore, this type of battery housing component offers the advantage of enhanced protection against mechanical impacts, such as those caused by a collision. In the event of a mechanical impact, for example, from a vehicle dynamically striking a surface, the protective plate can deform into cavities within the base component, thereby converting the impact energy into mechanical deformation energy. The deformation of the protective plate into the cavities of the battery housing component / base component protects the base component from further deformation, effectively safeguarding vehicle components located above the protective plate.This gives the battery housing component increased protection against mechanical impact.

[0088] Furthermore, the appropriately designed battery housing component has the advantage, due to its layered structure, that it exhibits a reduced tendency to warp when exposed to heat.

[0089] The protective plate preferably consists of a plastic and / or a metallic material.

[0090] The protective plate can preferably be connected to the base component by means of a force-fit connection and / or a form-fit connection and / or a material-fit connection (for example by means of welding).

[0091] The protective plate can be connected to the base component by means of fasteners. These fasteners can be screws, rivets, or other types of fasteners. For example, the protective plate can have a cavity with an undercut or a through-hole. The material of the base component can extend into the cavity, thus forming a rivet. Furthermore, the material of the base component can extend through a through-hole, the wall of which is preferably chamfered, thus forming a rivet. The protective plate can also be bonded to the base component. Finally, the protective plate can be welded to the base component.

[0092] The battery housing component can have multiple protective plates. These protective plates are preferably arranged side by side. This allows for increased flexibility of the battery housing component.

[0093] Preferably, the battery housing component is designed such that the protective plate has at least one plastic layer and at least one protective layer that is bonded to the plastic layer.

[0094] The appropriately designed battery housing component, despite its low weight, offers a high level of protection against mechanical impacts, such as those caused by a dynamic impact of a motor vehicle hitting a surface.

[0095] The plastic layer can be made of thermoplastic material, preferably polypropylene or polyamide. Alternatively, the plastic layer can be made of thermosetting material.

[0096] The plastic layer can be designed, at least in sections, as a fiber-reinforced plastic layer. This can improve the flexural rigidity of the underbody protection.

[0097] The plastic layer can contain long fibers and / or continuous fibers. This can further improve the flexural rigidity of the underbody protection.

[0098] The fibers of the plastic layer can be formed as glass fibers and / or carbon fibers and / or aramid fibers.

[0099] The protective layer can, for example, be designed as an organosheet. Organosheets are fiber-matrix semi-finished products. These consist of a woven or laid fiber fabric embedded in a thermoplastic polymer matrix. This improves hot formability and thus reduces manufacturing times. Furthermore, the flexural stiffness of the battery housing component can be improved.

[0100] The protective layer can also be designed as a metal layer. For example, the metal layer can be a steel layer or steel plate.

[0101] The problem underlying the present invention is further solved by a traction battery housing for receiving at least one battery component in a receiving volume of the traction battery housing, wherein the traction battery housing comprises a battery housing component as described above.

[0102] Furthermore, the problem underlying the invention is solved by a traction battery for a motor vehicle, wherein the traction battery has a traction battery housing as described above and at least one battery component which is arranged in the receiving volume of the traction battery housing and is in at least indirect contact with the contact surface of the multilayer film.

[0103] Furthermore, the problem underlying the present invention is solved by a motor vehicle, in particular an electric motor vehicle with a traction battery described above.

[0104] Furthermore, the problem underlying the present invention is solved in each case by a method for manufacturing a battery housing component with the features of claim 15 or claim 16 or claim 17 of claim 18.

[0105] Preferably, the bonding layer does not completely cover the base component, but is arranged in the areas of the base component where the multilayer film is connected to the base component by means of the bonding layer.

[0106] Further advantages, details, and features of the invention will become apparent from the exemplary embodiments described below. Specifically, the following will be shown: Figure 1A: a perspective sectional view of a traction battery according to the invention, comprising a traction battery housing according to the invention with a battery housing component according to the invention; Figure 1B: a perspective sectional view of a partial section A of the Figure 1AFigure 1: a traction battery shown; Figure 2: a schematic cross-sectional view of a multilayer film of a battery housing component according to the invention; Figure 3: a schematic cross-sectional view of a fiber-reinforced connecting component of a battery housing component according to the invention; Figure 4: a schematic cross-sectional view of a battery housing component according to a first embodiment of the present invention; Figure 5: a schematic cross-sectional view of a battery housing component according to a second embodiment of the present invention; Figure 6: a schematic cross-sectional view of a battery housing component according to a third embodiment of the present invention; and Figure 7: a schematic cross-sectional view of a battery housing component according to a fourth embodiment of the present invention.

[0107] In the following description, identical reference numerals denote identical components or identical features, so that a description of a component given 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.

[0108] Figure 1AFigure 1 shows a traction battery 200, which has a traction battery housing 100 in which two battery components 11, each designed as a battery module 11, are accommodated in a receiving volume of the traction battery housing 100. The traction battery housing 100 is designed in a trough-like shape, so that the two battery components 11 are arranged in a bottom region of the traction battery housing 100, with the two battery components 11 being in contact with a battery housing component 10 of the traction battery housing 10 over a comparatively large area in this bottom region. This comparatively large area enables heat exchange between the battery components 11 and the battery housing component 10. In particular, heat is generated during a charging and / or discharging process of the battery components 11, which can thus be transferred to and dissipated by the battery housing component 10.

[0109] In the illustrated embodiment, the battery housing component 10 has several reinforcing ribs 70, which makes the battery housing component 10, or the traction battery housing 100, particularly stable. Furthermore, a partial section A is shown, which focuses on a contact area between the left of the two battery components 11 and the battery housing component 10.

[0110] Figure 1B shows the partial section A of the battery housing 10 with a multilayer film 40, wherein the multilayer film 40 is on one side via a Figures 2 , 4 to 7 The contact surface 42 shown connects to the battery component 11 and, on the other hand, via a connection in the Figures 2 , 4 to 7 The connection surface 41 shown is connected to a fiber-reinforced connecting component 30 designed as a connecting plate 30.

[0111] A cooling fluid channel 50 is formed between the multilayer film 40 and the fiber-reinforced connecting component 30 for the conduction of a cooling fluid. Thus, heat generated by the battery component 11 can be dissipated via the contact surface 42, which is formed between the battery component 11 and the multilayer film 40, by means of a cooling fluid flowing through the cooling fluid channel 50.

[0112] The connecting component 30 is sandwiched between the base component 20 and the multilayer film 40 and is bonded to the multilayer film 40 on one side and to a base component 20 on the other. The base component 20 also has reinforcing ribs 70 in the partial cutout A, which provide increased stability to the battery housing component 10. Furthermore, the battery component 11 is connected to the connecting component 30, and thus to the battery housing component 10, via a permanent connection, for example, a joining connection.

[0113] Figure 2Figure 40 shows a possible embodiment of the multilayer film 40, which can be connected to the connecting component 30 at its connecting surface 41 and contacted with the battery component 11 via its contacting surface 42. Between the connecting surface 41 and the contacting surface 42, the multilayer film 40 has an insulating layer 43, a structural layer 44, and a bonding layer 45. The contacting surface 42 delimits the insulating layer 43, which can, for example, be made of a thermoplastic material and have a thickness between 20 µm and 100 µm.

[0114] The bonding surface 41 delimits the bonding layer 45, wherein the multilayer film 40 is preferably connected to the base component 20 by means of the bonding surface 41 by means of welding and / or bonding. The bonding layer 45 can, for example, comprise a fiberless thermoplastic material and be partially formed by a layer embedded in the Figures 4 to 7The illustrated compound layer 60 is formed.

[0115] The structural layer 44, which is made of a metallic material, for example aluminum, is arranged between the insulating layer 43 and the joining layer 45. The structural layer 44 also functions as a heat-conducting layer and serves to improve heat transfer to a cooling fluid guided in the cooling fluid channel 50.

[0116] Figure 3 Figure 1 shows a fiber-reinforced connecting component 30 of a battery housing component 10 according to the invention, comprising a connecting component outer layer 33, a central layer 35, and a connecting component inner layer 34. The connecting component 30 is bonded to the base component 20 via an inner surface 31 of the connecting component inner layer 34 and to the multilayer film 40 via an outer surface 32 of the connecting component outer layer 33.

[0117] The central layer 35, the outer surface 32 of the connecting component, and the inner surface 31 of the connecting component form a cross-ply 30 or an organosheet 30, wherein the central layer 35 is arranged sandwich-like between the outer surface 32 and the inner surface 31 of the connecting component. The central layer 35 comprises a fiber material 36 with unidirectional or multidirectional fibers, which is arranged in a polymer matrix. Alternatively, the central layer 35 can also comprise a continuous fiber-reinforced tape, also called unidirectional tape or UD tape. Such fiber material 36 can, for example, comprise glass fibers and / or aramid fibers and / or carbon fibers and / or other synthetic fibers.

[0118] The outer layer 33 of the connecting component and the inner layer 34 of the connecting component can, for example, consist predominantly of polypropylene and can therefore be connected particularly easily to the multilayer film 40 or the base component 20.

[0119] Fig. 4 Figure 1 shows the battery housing component 10 for a traction battery 200 for cooling at least one battery component 11, wherein the battery housing component 10 comprises the base component 20, the fiber-reinforced connecting component 30, and the multilayer film 40. The battery component 11 is arranged on the contact surface 42 of the multilayer film 40, thus enabling heat transfer between the battery component 11 and the battery housing component 10.

[0120] Out of Figure 4It is evident that the fiber-reinforced connecting component 30 is arranged sandwich-like between the base component 20 and the multilayer film 40. The inner surface 21 of the base component is bonded to the inner surface 31 of the connecting component. The bonding surface 41 of the multilayer film 40 is bonded to the outer surface 32 of the fiber-reinforced connecting component 30, forming at least one cooling fluid channel 50 between the multilayer film 40 and the connecting component 30 for the conveyance of a cooling fluid via the bonding layer 60 made of a fiberless thermoplastic.

[0121] The heat emitted by the battery component 11 can be dissipated to a cooling fluid, for example water, by means of the multilayer film 40, with the cooling fluid flowing through the cooling fluid channel 50. This dissipation prevents heat build-up in the area of ​​the battery component 11, as the cooling of the battery component 11 is achieved by the cooling fluid arranged in the cooling fluid channel 50.

[0122] The cooling fluid channel 50 is arranged centrally between the multilayer film 40 and the connecting component 30, so that the connecting layer 60 is arranged particularly on the short sides of the cooling fluid channel 50.

[0123] In the embodiment shown, a cooling fluid channel 50 is depicted; of course, a plurality of cooling fluid channels 50 can also be arranged in the battery housing component 10 for cooling battery components.

[0124] At the in Figure 4In the illustrated embodiment, the connecting component 30 has the connecting component outer layer 33, which consists of a fiberless thermoplastic material and is bounded by the connecting component outer surface 32, wherein the connecting layer 60 is at least partially formed by the connecting component outer layer 33.

[0125] Furthermore, the connecting component 30 has the connecting component inner layer 34, which consists of a fiberless thermoplastic material and is bounded by the connecting component inner surface 31, wherein the base component 20 is materially bonded to the fiber-reinforced connecting component 30 by means of the connecting component inner layer 34. Furthermore, the fiber-reinforced connecting component 30 and / or the multilayer film 40 of the battery housing component 10 according to the first embodiment can also have features of the components described above. Figures 2 and 3 described multilayer film 40 and the connecting component 30.

[0126] Figure 5Figure 1 shows an embodiment of the battery housing component 10 according to a second embodiment, which is distinguished by a design of the fiber-reinforced connecting component 30. This connecting component now has the central layer 35, which is arranged sandwich-like between the outer layer 33 and the inner layer 34 of the connecting component. The central layer also comprises the fiber material 36, which in the illustrated embodiment has multidirectional fibers. The battery housing component 10 designed in this way is particularly stable due to the central layer 35, so that the battery housing component 10 is advantageously robust against loads and stresses. The remaining structure of the battery housing component 10 according to the second embodiment corresponds to that of the battery housing component 10 according to the first embodiment, so reference is made to the above descriptions to avoid repetition.

[0127] Figure 6 Figure 1 shows a third embodiment of the battery housing component 10, which now no longer has a fiber-reinforced connecting component 30, so that the cooling fluid channel 50 is arranged directly between the connecting surface 41 of the multilayer film 40 and the inner surface 21 of the base component by means of the connecting layer 60. In the embodiment shown in Figure 10, the following applies: Figure 6In the depicted battery housing component 10, the connecting surface 41 of the multilayer film 40 is bonded to the inner surface 21 of the base component 20 by means of a bonding layer 60 made of a fiberless thermoplastic, forming at least one cooling fluid channel 50 arranged between the multilayer film 40 and the base component 20 for the conduction of a cooling fluid. The remaining structure of the battery housing component 10 according to the third embodiment corresponds to that of the battery housing component 10 according to the first embodiment, so reference is made to the above descriptions to avoid repetition.

[0128] Figure 7 shows a battery housing component 10 according to a fourth embodiment. In the Figure 7In the illustrated battery housing component 10, the multilayer film 40 comprises the bonding layer 45, the structural layer 44, and the insulating layer 43 between the bonding surface 41 and the contact surface 42, with the structural layer 44 arranged in a sandwich-like configuration between the insulating layer 43 and the bonding layer 45. The contact surface 42 of the multilayer film 40 delimits the insulating layer 43, and the bonding surface 41 of the multilayer film 40 delimits the bonding layer 45. The bonding layer 60 is at least partially formed by the bonding layer 45. The bonding layer 45 thus enables the multilayer film 40 to be particularly advantageously joined to the inner surface 21 of the base component.

[0129] The battery housing component 10 according to the fourth embodiment is designed such that the base component 20 has reinforcing ribs 70 on its outer surface 22, thereby giving the correspondingly designed battery housing component 10 increased stiffness and strength. In the illustrated embodiment, the reinforcing ribs 70 are monolithic with the base component 20.

[0130] The battery housing component 10 according to the fourth embodiment further comprises a protective plate 80, which is connected to the outer surface 22 of the base component. The protective plate 80 can have a layer of thermoplastic material, be designed at least partially as a fiber-reinforced plastic layer, and may contain long fibers and / or continuous fibers. Furthermore, the protective plate 80 can be designed as a metal plate and / or an organosheet. The protective plate 80 can also be bonded or welded to the base component 20.

[0131] The remaining structure of the battery housing component 10 according to the fourth embodiment corresponds to that of the battery housing component 10 according to the first embodiment, so that reference is made to the above statements in order to avoid repetition.

[0132] The respective features of the battery housing components 10 according to the first to fourth embodiments can also be combined with one another. For example, the protective plate 80 can also be attached to the respective base component outer surfaces 22 of the battery housing components 10 according to the first to third embodiments. Reference symbol list

[0133] 10 Battery housing component 11 Battery component 20 Base component 21 Base component inner surface 22 Base component outer surface 30 Fiber-reinforced connecting component 31 Connecting component inner surface 32 Connecting component outer surface 33 Connecting component outer layer 34 Connecting component inner layer 35 Central layer 36 Fiber material 40 Multilayer film 41 Connecting surface 42 Contacting surface 43 Insulating layer 44 Structural layer 45 Joining layer 50 Cooling fluid channel 60 Connecting layer 70 Reinforcing ribs 80 Protective plate 100 Traction battery housing 200 Traction battery A Partial section of the battery housing

Claims

1. Battery housing component (10) for a traction battery (200) for cooling at least one battery component (11), the battery housing component (10) having the following features: - the battery housing component (10) has a base part (20) which comprises a first plastics material; - the battery housing component (10) has a fiber-reinforced bonding part (30) which has a bonding part inner surface (31) and a bonding part outer surface (32); - the battery housing component (10) has a multilayer film (40), the multilayer film (40) having a bonding surface (41) and a contacting surface (42), the contacting surface (42) being designed for at least indirectly contacting the at least one battery component (11); - the fiber-reinforced bonding part (30) is sandwiched between the base part (20) and the multilayer film (40); and - a base part inner surface (21) of the base part (20) is materially bonded to the bonding part inner surface (31); the battery housing component (10) being characterized in that - the bonding surface (41) of the multilayer film (40) is materially bonded, by means of a bonding layer (60) made of a fiberless thermoplastic plastics material, to the bonding part outer surface (32) of the fiber-reinforced bonding part (30), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the bonding part (30).

2. Battery housing component (10) according to claim 1, characterized by the following features: - the bonding part (30) has a bonding part outer layer (33) which consists of a fiberless thermoplastic plastics material and is delimited by the bonding part outer surface (32); and - the bonding layer (60) is at least partially formed by the bonding part outer layer (33).

3. Battery housing component (10) according to either of the preceding claims, characterized by the following features: - the bonding part (30) has a bonding part inner layer (34) which consists of a fiberless thermoplastic plastics material and is delimited by the bonding part inner surface (31); and - the base part (20) is materially bonded to the fiber-reinforced bonding part (30) by means of the bonding part inner layer (34).

4. Battery housing component (10) according to claim 3, characterized by the following features: - the bonding part (30) has a central layer (35) which is arranged between the bonding part inner layer (34) and the bonding part outer layer (33); and - the central layer (35) comprises a fiber material (36) which is arranged in a plastics material matrix.

5. Battery housing component (10) according to claim 4, characterized in that the fiber material (36) has unidirectionally running fibers.

6. Battery housing component (10) according to claim 4, characterized in that the fiber material (36) has multidirectionally running fibers.

7. Battery housing component (10) for a traction battery for cooling at least one battery component (11), the battery housing component (10) having the following features: - the battery housing component (10) has a base part (20) which comprises a first plastics material; - the battery housing component (10) has a multilayer film (40), the multilayer film (40) having a bonding surface (41) and a contacting surface (42), the contacting surface (42) being designed for at least indirectly contacting the at least one battery component (11); the battery housing component (10) being characterized in that - the bonding surface (41) of the multilayer film (40) is materially bonded, by means of a bonding layer (60) made of a fiberless thermoplastic plastics material, to a base part inner surface (21) of the base part (20), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the base part (20).

8. Battery housing component (10) according to any of the preceding claims, characterized by the following features: - the multilayer film (40) has an insulating layer (43) and a structural layer (44) bonded thereto; and - the contacting surface (42) of the multilayer film (40) delimits the insulating layer (43).

9. Battery housing component (10) according to claim 8, characterized by the following features: - the multilayer film (40) has a joining layer (45); - the structural layer (44) is sandwiched between the insulating layer (43) and the joining layer (45); and - the bonding layer (60) is at least partially formed by the joining layer (45).

10. Battery housing component (10) according to any of the preceding claims, characterized in that the base part (20) has reinforcing ribs (70) on a base part outer surface (22) which faces away from a base part inner surface (21).

11. Battery housing component (10) according to any of the preceding claims, characterized in that the battery housing component (10) has a protective plate (80) which is connected to the base part outer surface (22).

12. Traction battery housing (100) for receiving at least one battery component (11) in a receiving volume of the traction battery housing (100), having a battery housing component (10) according to any of the preceding claims.

13. Traction battery for a motor vehicle, having a traction battery housing (100) according to claim 12 and at least one battery component (10) which is arranged in the receiving volume of the traction battery housing (100) and is in at least indirect contact with the contacting surface (42) of the multilayer film (40).

14. Motor vehicle comprising a traction battery according to claim 13.

15. Method for manufacturing a battery housing component (10) comprising the features of claim 1, wherein the method has the following method steps: - providing an injection mold which is adjustable between an open position and a closed position and which has a cavity; - inserting a fiber-reinforced bonding part (30) into the cavity of the injection mold while the injection mold is in the open position; - closing the injection mold; - injecting a first plastics material into the cavity of the injection mold, with the result that the bonding part inner surface (31) comes into direct contact with the first plastics material and is materially bonded to the first plastics material; - opening the injection mold and removing the base part (20) and the fiber-reinforced bonding part (30) materially bonded thereto; - positioning the multilayer film (40) on the bonding part (30) such that the bonding surface (41) of the multilayer film (40) comes into contact with the bonding part outer surface (32) of the fiber-reinforced bonding part (30); and - materially bonding the bonding surface (41) of the multilayer film (40) to the bonding part outer surface (32), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the bonding part (30).

16. Method for manufacturing a battery housing component (10) comprising the features of claim 1, wherein the method has the following method steps: - providing an extrusion tool having a punch and having a die with a receiving device; - inserting a fiber-reinforced bonding part (30) into the receiving device of the die such that the bonding part inner surface (31) is freely accessible; - positioning at least one plasticized substance, consisting of the first plastics material, on the bonding part inner surface (31); - deforming the at least one plasticized substance by means of the punch, with the result that the at least one plasticized substance comes into contact with the entire bonding part inner surface (31) and the bonding part inner surface (31) is materially bonded to the first plastics material; - removing the base part (20) and the fiber-reinforced bonding part (30) materially bonded thereto; - positioning the multilayer film (40) on the bonding part (30) such that the bonding surface (41) of the multilayer film (40) comes into contact with the bonding part outer surface (32) of the fiber-reinforced bonding part (30); and - materially bonding the bonding surface (41) of the multilayer film (40) to the bonding part outer surface (32), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the bonding part (30).

17. Method for manufacturing a battery housing component (10) comprising the features of claim 7, wherein the method has the following method steps: - providing an injection mold which is adjustable between an open position and a closed position and which has a slide, with the result that in a first position of the slide a first cavity is formed in the injection mold when the injection mold is in its closed position, and in a second position of the slide a second cavity is formed in the injection mold when the injection mold is in its closed position; - moving the injection mold into its closed position and moving the slide into its first position; - injecting a fiberless thermoplastic plastics material into the first cavity, forming the bonding layer (60); - moving the slide to its second position; - injecting a first plastics material into the second cavity of the injection mold, with the result that the bonding layer (60) comes into direct contact with the first plastics material and is materially bonded to the first plastics material; - opening the injection mold and removing the base part (20) and the bonding layer (60) materially bonded thereto; - positioning the multilayer film (40) on the bonding layer (60) such that the bonding surface (41) of the multilayer film (40) comes into contact with the bonding layer (60) of the fiber-reinforced bonding part (30); and - materially bonding the bonding surface (41) of the multilayer film (40) to the bonding layer (60), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the base part (20).

18. Method for manufacturing a battery housing component (10) comprising the features of claim 7, wherein the method has the following method steps: - providing an injection mold which has a first injection mold half and a second injection mold half, - wherein the first injection mold half has a first recess and a second recess spaced apart from said first recess, - wherein the position of the first injection mold half relative to the second injection mold half is variable between a first position and a second position, - wherein in a closed position of the injection mold and the first position of the first injection mold half, the injection mold forms a first cavity, and - wherein in the closed position of the injection mold and the second position of the first injection mold half, the injection mold forms a second cavity; - moving the first injection mold half into its first position and closing the injection mold; - injecting a fiberless thermoplastic plastics material into the first cavity, forming the bonding layer (60); - opening the injection mold; - moving the first injection mold half into its first position and closing the injection mold; - injecting a first plastics material into the second cavity of the injection mold, with the result that the bonding layer (60) comes into direct contact with the first plastics material and is materially bonded to the first plastics material; - opening the injection mold and removing the base part (20) and the bonding layer (60) materially bonded thereto; - positioning the multilayer film (40) on the bonding layer (60) such that the bonding surface (41) of the multilayer film (40) comes into contact with the bonding layer (60) of the fiber-reinforced bonding part (30); and - materially bonding the bonding surface (41) of the multilayer film (40) to the bonding layer (60), forming at least one cooling fluid channel (50) for conveying a cooling fluid, said channel being arranged between the multilayer film (40) and the base part (20).