Crash-resistant energy storage device and motor vehicle therewith as well as corresponding manufacturing process

Abstract

The invention relates to an energy storage device (2), a motor vehicle (1) equipped therewith, and a corresponding manufacturing method. The energy storage device (2) has a housing (3) and a plurality of battery cells (7) arranged therein. A fastening anchor (10) is fastened to a housing part (5) and projects into an interior space (6) of the housing (3). In the interior space (6), the battery cells (7) and the fastening anchor (10) are foamed around with a foam material (11), resulting in a secure connection between the cured foam material (11) and the fastening anchor (10).

Description

[0001] The present invention relates to an energy storage device, in particular a battery device, and a motor vehicle equipped therewith. The invention further relates to a method for manufacturing such an energy storage device.

[0002] Energy storage devices in the form of rechargeable batteries are used today in a wide variety of areas and applications. Under certain circumstances, such energy storage devices may be exposed to significant mechanical forces and stresses, for example, in the event of an accident involving a motor vehicle equipped with such an energy storage device. To avoid damage to or destruction of the energy storage device in such a case, or at least to minimize consequential damage, the energy storage device should be sufficiently robust, for example to prevent it from breaking or tearing open. At the same time, however, the energy storage device should be as cost-effective, dense, and compact as possible, and have the highest possible energy density. This can result in a conflict of objectives that, despite various existing solutions, still leaves room for further improvement.

[0003] As one approach, DE 10 2018 009 505 A1 describes a battery housing for motor vehicles manufactured using a casting process. It stipulates that the lateral walls and / or other predominantly vertical walls of the battery housing, facing the direction of travel, are primarily designed as a corrugated profile.

[0004] As a further approach, DE 10 2019 210 057 A1 describes a rechargeable battery that is said to be characterized by increased mechanical stability and simplified maintenance. To this end, the rechargeable battery comprises a housing for accommodating rechargeable battery cells, comprising a first and a second housing part filled with a liquid for controlling the temperature of the rechargeable battery cells. The housing parts are releasably attached to one another by means of a tie rod.

[0005] WO 2020 / 109714 A1 further describes a battery housing comprising a box, two lids for hermetically sealing the box, and a plurality of accumulators arranged in the battery housing. The box consists of a profile with two pairs of opposite sides and two open ends and is configured such that it can be assembled along one of these sides with a box of another battery housing. The battery housing has a raised electrically conductive section relative to each support surface to ensure electrical contact with the other box or battery housing.

[0006] The object of the present invention is to improve the mechanical properties of an energy storage device, for example with regard to crash safety, robustness against mechanical loads and operational strength.

[0007] This problem is solved by the subject matter of the main claim and the subsidiary claims or the independent claims. Further possible embodiments of the invention are disclosed in the subclaims, the description, and the figures. Features, advantages, and possible embodiments presented in the description for one of the subject matter of the independent claims are to be regarded at least analogously as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the subclaims.

[0008] The energy storage device according to the invention can be a battery or battery device, in particular a traction battery for a motor vehicle. The energy storage device can therefore, for example, be a so-called high-voltage storage device that is designed or configured for a nominal or output voltage of more than 45 V, in particular in the range of several hundred V. The energy storage device according to the invention has a housing and a plurality of battery cells arranged in an interior of this housing. These battery cells can, in particular, be rechargeable, i.e., secondary cells. For example, the battery cells can have a lithium-, cobalt-, iron-, or sodium-based cell chemistry, but are not limited thereto. In particular, the battery cells can be configured as cylindrical battery cells. However, other shapes or types of battery cells can also be used.

[0009] According to the invention, at least one fastening anchor is fastened to a housing part of the housing that delimits the interior of the housing on at least one side. The fastening anchor can also be referred to as a force anchor or holding anchor. In particular, the fastening anchor can function - at least also - as a tension anchor. Such a housing part can, for example, be a housing wall or an upper housing part or a housing cover or a lower housing part or a housing base. In particular, the housing part to which the fastening anchor is fastened can be or form an outer wall of the housing. According to the invention, the fastening anchor or a shaft of the fastening anchor projects from the housing part into the interior of the housing, i.e. into the area in which the battery cells are also arranged. Furthermore, according to the invention, the battery cells and the at least one fastening anchor are foamed or enclosed in a foam material in the interior of the housing.foamed in, so that a holding connection is created between the cured foam material and the fastening anchor. Thus, the housing part to which the fastening anchor is attached is then anchored, i.e. fastened or held, in the foam material via the fastening anchor. In particular, the interior of the housing, as long as it is not occupied by other parts or components of the energy storage device, such as a cell contact system or sensors or an electrical or electronic system of the energy storage device, can be at least substantially completely filled with the foam material. In particular, the battery cells and the fastening anchor can each be completely or on all sides surrounded or enclosed by the foam material, for example except for contacts or fixed connections to other parts or components.

[0010] The foam material can be electrically insulating or non-conductive. During production of the energy storage device, i.e. while it is being introduced into the housing or its interior, the foam material can be liquid or viscous, for example, and then harden, for example through drying and / or cross-linking. The foam material that has hardened in this way can improve the robustness of the energy storage device, for example compared to an otherwise identical energy storage device design without the foam material. For example, after it has hardened, the foam material can absorb or distribute compressive loads acting on the energy storage device from the outside and prevent or reduce relative movements of parts or components within the housing. Furthermore, the holding connection between the foam material and the fastening anchor can create a corresponding holding effect or holding force, which prevents the device from lifting off, detaching or breaking away.Tearing off the housing part to which the fixing anchor is attached can be prevented or at least inhibited or made more difficult by the rest of the energy storage device.

[0011] Such a lifting or detachment of the housing part can occur with conventional energy storage devices, for example in the event of a crash, in particular if a motor vehicle equipped with the energy storage device hits a pole. This can lead to potentially dangerous or reactive chemicals from the energy storage device or its battery cells entering the area surrounding the energy storage device or reacting, in particular exothermically, with air penetrating from the environment into the interior of the housing. Likewise, components or material could then be ejected from the interior of the energy storage device into its surroundings. This source of danger can be reduced or contained by the present invention. This can be achieved particularly simply, efficiently, cost-effectively and with little additional space required, while at the same time keeping the weight and material requirements of the energy storage device particularly low.For example, there is no need to provide an additional counterpart to the fastening anchor, i.e., no additional bracket or receptacle for the fastening anchor on another housing part. This can also simplify packaging, i.e., component arrangement within the energy storage device, since the fastening anchor, for example, does not necessarily have to completely penetrate the interior or the housing. The foam material can also compensate for manufacturing tolerances, such as size and / or positional deviations of the fastening anchor, automatically or due to its inherent properties. This enables particularly simple and cost-effective production of the energy storage device and, at the same time, particularly high consistency and reliability of the holding connection between the foam material and the fastening anchor.

[0012] The foam material can, in particular, be adhesive, resulting in an adhesive bond between the foam material and the fastening anchor. An inner side of the housing part facing the battery cells or the interior can also be in contact with the foam material and then be adhesively held by it or to it. However, compared to, for example, a substantially flat or planar design of the inner side of the housing part, the fastening anchor offers at least an additional contact area with the foam material, so that the fastening anchor results in a correspondingly greater holding force.

[0013] The fastening anchor can be attached to the housing part, for example, by means of a welded connection, i.e., one or more weld points, or by means of an adhesive connection, or by means of a screw connection, or by means of a rivet connection, or the like. This connection can be designed such that it is at least as stable and resilient to tensile and / or compressive forces acting on the housing part from the interior space as the holding connection of the fastening anchor to the foam material. This can prevent the housing part from tearing away from the fastening anchor under corresponding load, leaving the anchor in the foam material.

[0014] The fastening anchor can have a head or cover part that is attached to the housing and a shaft that projects from the head or cover part into the interior of the housing. The head or cover part can, for example, have a larger diameter than the shaft, but be shorter or flatter in the longitudinal direction of the shaft. This enables a particularly stable and space-saving attachment of the fastening anchor or the head or cover part to the housing part.

[0015] The fastening anchor or at least one of possibly several fastening anchors of the energy storage device can be arranged in particular in a central or edge-remote region of the housing part or the corresponding side of the housing. In other words, one or more battery cells can then be arranged between the fastening anchor and a housing wall or housing side, which extends, for example, substantially perpendicular to the main extension plane of the housing part to which the fastening anchor is fastened. By arranging the fastening anchor in this way, the robustness of the energy storage device can be further improved, in particular with respect to the lifting or detachment of the housing part from the rest of the energy storage device caused by external mechanical forces, for example compared to an arrangement of the fastening anchor on the edge or close to the edge.This is the case because along the edge of the housing part, for example, it can already be connected to one or more other housing parts and is therefore already held there.

[0016] Likewise, several corresponding fastening anchors can be attached to the housing part at various locations. Additionally or alternatively, one or more corresponding fastening anchors can be attached to one or more other housing parts or housing walls, each extending from there into the interior of the housing.

[0017] The at least one fastening anchor can protrude into the interior of the housing without reaching as far as a housing part or a housing wall that is opposite the housing part or housing wall to which the fastening anchor is fastened. If the fastening anchor is therefore fastened, for example, to an upper housing part or housing cover, it does not have to reach as far as an opposite housing base or housing bottom part. Rather, an end of the fastening anchor or the shaft of the fastening anchor facing away from the housing part to which the fastening anchor, in particular its head or cover part, is fastened can be spaced from the housing part opposite it. This distance can then be filled entirely or partially by the foam material.The mounting anchor can therefore hold the housing part to which it is attached to the foam material, or above it, to the rest of the energy storage device, without direct contact with another housing part or another housing side. The mounting anchor can therefore hold the housing part to the rest of the energy storage device without directly connecting two housing parts or two housing sides.

[0018] In one possible embodiment of the present invention, the battery cells are arranged in a predetermined regular pattern. This can be, for example, a grid or checkerboard pattern or, in particular when using cylindrical battery cells, a hexagonal close packing of the battery cells or the like. A place in the pattern where one of the battery cells would be arranged according to the rule of the pattern is instead taken up by the fastening anchor or the shaft of the fastening anchor. When using cylindrical battery cells, these can, for example, be arranged in a regular pattern with cylinder axes parallel to one another, wherein the shaft of the fastening anchor can then be arranged or extended parallel to these cylinder axes, i.e. parallel to the battery cells. The fastening anchor orThe shaft of the latter can, for example, have at least substantially the same size, i.e., the same length and / or the same diameter, as the battery cells. The embodiment of the present invention proposed here enables a particularly simple arrangement of the battery cells and a particularly simple, cost-effective, and compact production or design of the energy storage device.

[0019] The fastening anchor or at least a part of the fastening anchor protruding into the housing can have an envelope shape or envelope geometry or envelope that can at least substantially correspond to the shape and / or size of one of the battery cells of the energy storage device. In other words, the external shape and / or external size of the fastening anchor or at least the part of the fastening anchor protruding into the housing, i.e. a shaft of the fastening anchor mentioned elsewhere, can correspond to that of one of the battery cells, if indentations, depressions, cutouts and openings in the reference anchor are disregarded. This enables simple production of the energy storage device and the fastening anchor and allows a large contact area between the fastening anchor and the foam material to be achieved. The basic orThe shape and / or size of the fastening anchor relating to the envelope shape can also be used or given in the other embodiments of the present invention.

[0020] In a further possible embodiment of the present invention, the fastening anchor has a cover or head part, or the cover or head part mentioned elsewhere, which is fastened to the housing, and the shaft connected to it, which extends from there into the interior of the housing. Here, the shaft has different cross-sections or diameters in some areas along its longitudinal extent, so that a form-fitting or form-fitting holding connection with the cured foam material is produced. The shaft can, for example, have a corrugated profile on the outside or one or more projections and / or depressions or a rib structure or the like. This makes it possible, for example, to achieve a more uniform profile than a purely cylindrical shaft with a flat orWith a flat surface, not only can a larger contact area be realized between the foam material and the fastening anchor, which can, for example, enable a greater adhesive holding force. Rather, the design of the fastening anchor proposed here also allows for an additional type or component of holding force to be realized through its positive anchoring in the cured foam material. This allows the fastening anchor to be held or anchored in the foam material in a particularly stable and resilient manner, thus holding the corresponding housing part particularly stable and robust to the rest of the energy storage device.

[0021] The shaft, i.e. the part of the fastening anchor that projects into the housing, can here and / or in the other described embodiments of the present invention - have at least one recess or one opening. Such an opening can reach through the fastening anchor or its shaft as far as a hollow interior or inner region of the fastening anchor or shaft, i.e. at least one side wall of the fastening anchor or shaft. Likewise, such an opening can reach completely through the fastening anchor or its shaft, in particular in a direction that is at least substantially perpendicular to the direction in which the fastening anchor or the shaft projects from the housing part into the housing. Such a recess or such an opening canThe contact area of the fastening anchor is further increased, enabling a particularly robust, positive connection between the fastening anchor and the foam material. This allows the fastening anchor to be anchored and held particularly securely in the foam material.

[0022] In a further possible embodiment of the present invention, the fastening anchor, as described elsewhere, has the head part fastened to the housing and the shaft connected to it, which projects into the interior. Here, the shaft is hollow, i.e., designed as a hollow shaft, at least in an area, section, or end facing away from the housing part to which the fastening anchor is fastened. A corresponding cavity in the shaft is open in the direction away from the housing part to which the fastening anchor is fastened, i.e., towards the interior of the housing. Thus, during manufacture of the energy storage device, the foam material can also penetrate into this cavity, i.e., the interior of the shaft of the fastening anchor. This can result in a correspondingly larger contact area between the foam material and the fastening anchor. This, in turn, can lead to a further increased holding force for holding the fastening anchor.of the housing part to the rest of the energy storage device, thus further improving the robustness of the energy storage device. As described elsewhere, an inner surface of the shaft surrounding or delimiting the cavity or hollow area in the shaft can be structured or profiled, i.e., three-dimensionally shaped, to create a positive connection between the shaft and the foam material. The cavity or hollow area of the shaft can therefore have different sizes, diameters, or cross-sections in certain areas or places along the longitudinal extent of the shaft. This allows a further increase in holding force to be achieved.

[0023] In a further possible embodiment of the present invention, the fastening anchor, as described elsewhere, has the head part fastened to the housing and the shaft connected to it, which extends into the interior of the housing. The head part is welded to the shaft here. Such welding of the head part to the shaft can, on the one hand, enable a particularly stable and robust connection of the head part to the shaft. This eliminates this connection or a corresponding connection point or connection area as a weak point in the force chain or the force path from the housing part to the foam material. On the other hand, the two-part design of the fastening anchor here - as in the other corresponding embodiments - enables particularly simple production of the energy storage device.For example, the shaft can be foamed over separately from the head section and the housing section in the interior of the housing or inserted into the not yet cured foam material, without the housing section having to be arranged or mounted on the energy storage device. Once the shaft has been fixed in place by the foam material or anchored in it, the head section or an assembly comprising the housing section and the head section already attached to it can be mounted on the energy storage device. Likewise, the head section and the housing section can be mounted separately, for example. The head section can then be welded to the shaft. If this has not already been done, the head section can then also be attached to the housing part. In principle, the shaft can also be or be attached directly to the housing part, for example using the same or a separate weld.

[0024] In a further possible embodiment of the present invention, the fastening anchor, as described elsewhere, has the head part fastened to the housing and the shaft connected thereto, which extends into the interior. The head part here has, in particular in the center, a through-hole with an internal thread. Furthermore, the shaft is hollow here, at least in its part or region or section facing the head part, and is designed with an internal thread. The shaft is connected to the head part by means of a threaded rod which is screwed into or engages the internal threads of the head part and the shaft. At the through-hole, the head part can, for example, be shaped towards the interior and / or outwards or can have an extended shape or sleeve equipped with the internal thread.This allows for a correspondingly longer thread length to be achieved there, for example, compared to the material thickness of the head part in an area of the head part surrounding the through hole or spaced from it. This allows for a higher holding force and a larger tolerance for the screw-in depth of the threaded rod to be achieved during the production of the energy storage device. The proposed connection of the head part to the shaft using the threaded rod can enable particularly simple and low-cost production of the energy storage device. Furthermore, this connection can then be detachable, which can, for example, improve the repairability and / or disassembly of the energy storage device, for example for recycling purposes.

[0025] In a further possible embodiment of the present invention, the fastening anchor has a head part (or the one mentioned elsewhere) and a shaft (or the one mentioned elsewhere) connected to it, which extends from the head part into the interior of the housing. Here, the shaft is hollow at least in its part or region or section facing the head part. Furthermore, the head part has a bolt, for example a screw or punch bolt. This bolt projects into the hollow region of the shaft and is held there. The bolt can be firmly or permanently connected to the head part, for example by means of a welded connection, or can be formed as an integral part of the head part. The shaft can have an internal thread in its hollow region, into which the bolt, then designed with a corresponding external thread, can be screwed.Likewise, the bolt can, for example, be pressed into the shaft, glued or welded, or connected to the shaft in some other way by force and / or form and / or material engagement. Here, too, the head section can be attached to the housing part - firmly, permanently, or detachably. Likewise, the housing part can, for example, be arranged between the head section and the shaft, i.e., for example, clamped or restrained. In this case, the head section can, for example, rest on the outside of the housing part. The shaft can then, for example, abut against the inside of the housing part facing the interior. The bolt can then pierce or protrude through the housing part or a through hole provided therein. The embodiment of the present invention proposed here can enable particularly simple and cost-effective production of the energy storage device and / or contribute to minimizing its number of components, i.e., its complexity.

[0026] In a further possible embodiment of the present invention, the fastening anchor, in particular its shaft mentioned elsewhere, has a steel core or a steel insert that is surrounded, i.e., encased, in a plastic material. This plastic material can then form an outer surface of the fastening anchor, at least on the shaft. For example, during production of the fastening anchor separately from the actual energy storage device, the steel core can be or have been overmolded with the plastic material. The steel core proposed here can have a particularly high thermal capacity and thermal conductivity, for example compared to common plastic materials, and can thus dissipate heat from the energy storage device, for example in the event of a thermal failure of the energy storage device. In addition, the steel core can impart particularly high strength to the fastening anchor, for example against deformation or shear forces.This can ultimately further improve the robustness of the energy storage device as a whole. Furthermore, the steel core can enable particularly simple and stable fastening, for example, for attaching the fastening anchor to the housing part and / or for attaching the shaft and head part of the fastening anchor mentioned elsewhere to each other. The plastic material surrounding the steel core, for example, can enable better adhesion of the foam material to the fastening anchor compared to the steel core and / or can be adapted or selected to meet specific requirements in a specific case, without significantly affecting the stability of the fastening anchor.

[0027] The present invention also relates to a motor vehicle equipped with the energy storage device according to the invention. The energy storage device can be configured, in particular, as a traction battery of the motor vehicle according to the invention. The energy storage device can be arranged in the motor vehicle, for example, such that the fastening anchor or its shaft extends longitudinally in the vertical direction of the vehicle. The housing part to which the fastening anchor is attached can, for example, form an upper housing side of the energy storage device in the vertical direction of the vehicle.

[0028] The invention also relates to a method for manufacturing the energy storage device according to the invention. In the method, the housing is provided for accommodating a plurality of battery cells. A plurality of battery cells are arranged in the housing. The battery cells are encased in the foam material. Before or after the battery cells are encased in the foam, at least one fastening anchor is arranged next to or between the battery cells, i.e. in the interior of the housing, so that it is also encased in the foam material at least after the battery cells have been encased in the foam. If the fastening anchor is only arranged next to or between the battery cells after they have been encased in the foam, this can take place in particular before the foam material has hardened. In principle, however, the fastening anchor could also be inserted, for example screwed, into the already hardened foam material.The fastening anchor is fastened to the housing or to a housing part, in particular to an upper housing part of the housing, before or after its arrangement next to or between the battery cells. As a further part or step of the method, the foam material hardens, in particular after the fastening anchor has been arranged next to or between the battery cells, so that a holding, in particular adhesive and / or form-fitting, connection of the foam material via the fastening anchor to the housing or at least the housing part to which the fastening anchor is fastened is produced. To cure the foam material, a corresponding waiting time can be provided in the method according to the invention, for example, and / or the foam material can be heated, for example, or irradiated with UV light or the like.Further measures or processes or procedures mentioned in connection with the energy storage device according to the invention and / or in connection with the motor vehicle according to the invention can form further, possibly optional, process steps of the process according to the invention.

[0029] Further features of the invention may emerge from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures alone, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0030] The drawing shows: Fig. 1 a schematic representation of a motor vehicle with an energy storage device having a fastening anchor; Fig. 2 a schematic sectional perspective view of the fastening anchor in a first variant; Fig. 3 a schematic sectional perspective view of the fastening anchor in a second variant; Fig. 4 a schematic sectional perspective view of the fastening anchor in a third variant; Fig. 5 a schematic sectional perspective view of the fastening anchor in a fourth variant; Fig. 6 a schematic sectional perspective view of the fastening anchor in a fifth variant; and Fig. 7 a schematic sectional view of the fastening anchor in a sixth variant.

[0031] In the figures, identical and functionally equivalent elements are provided with the same reference numerals. For the sake of clarity, only a representative selection of identical or similar elements may be explicitly identified in the figures.

[0032] Fig. 1 shows a schematic representation of a motor vehicle 1 equipped with an energy storage device 2. The energy storage device 2 can, in particular, be a traction battery of the motor vehicle 1. The energy storage device 2 has a housing 3 with a lower housing part 4 and an upper housing part 5. These housing parts 4, 5 surround an interior 6 of the housing, in which several battery cells 7 are arranged. The battery cells 7 can be connected, for example, by means of a cell contact system 8 (shown schematically here) and connected to battery electronics 9 (likewise only indicated here).

[0033] In the present case, the energy storage device 2 also has at least one fastening anchor 10. This is attached to the upper housing part 5 and projects from there into the interior 6. Otherwise free areas of the interior 6 are filled with a foam material 11. The foam material 11 thus encloses both the battery cells 7 and at least partially the fastening anchor 10. Specifically, the fastening anchor 10 here has a head part 12 attached to the upper housing part 5 and a shaft 13 extending from there into the interior 6. At least the shaft 13 of the fastening anchor 10 is thus embedded in the foam material 11, i.e., anchored therein. By means of the fastening anchor 10, the upper housing part 5 is thus anchored in the foam material 11, i.e., held therein. In addition, the upper housing part 5 can be attached to the lower housing part 4 or connected thereto, for example at its edges.Here, however, the fastening anchor 10 is arranged in a central region of the upper housing part 5. This can be the case both—as can be seen here—in the direction or dimension of the plane of the drawing, in this case in the longitudinal direction of the motor vehicle 1, and perpendicular to the plane of the drawing, in this case in the transverse direction of the vehicle.

[0034] For further illustration, Fig. 2 shows a partially schematic, sectional perspective view of the fastening anchor 10 in a first variant. Here, the head part 12 is at least substantially flat, plate-shaped, or designed as a circular disk. The head part 12 has a through-hole 14 in which a screw sleeve 15 is formed. There, the head part 12 has an internal thread. The shaft 13 is designed as a hollow shaft and also has an internal thread, at least in some areas. The head part 12 and the shaft 13 are connected to one another by a threaded rod 17, which is screwed into this internal thread.

[0035] In this case, the threaded rod 17 is shorter than the shaft 13, leaving an open cavity 16 at its end facing away from the head portion 12. The foam material 11 can penetrate into this cavity 16. To generate additional holding force of the fastening anchor 10 in the foam material 11, the shaft 13 has a structure or profile on the outside with cross-sections or diameters that differ in some areas or places in order to create a positive connection with the foam material 11. The shaft 13 or the head portion 12 can be made entirely or partially, for example, from a metallic material such as steel or aluminum.

[0036] For further illustration, Fig. 3 shows a partially schematic, cutaway perspective view of the fastening anchor 10 in a second variant. Here, the head portion 12 has a bolt 18 instead of the through hole 14 and the screw sleeve 15. This bolt can, for example, be screwed into a corresponding internal thread of the shaft 13, which is also hollow in this case, similar to the threaded rod 17.

[0037] For further illustration, Fig. 4 shows a schematic, sectional perspective view of the fastening anchor 10 in a third variant. Here, the head portion 12 also has a bolt 18 that protrudes into the shaft 13, for example, screwed into it. However, the shaft 13 has a different shape or design here. In particular, the shaft 13 has a ribbed or compartmentalized structure on the outside, into which the foam material can also penetrate to create a positive connection.

[0038] The bolt 18 can, for example, be formed as an inherent part of the head part 12 or welded to the head part 12. A connection between the head part 12 and the shaft 13 can be established here, for example, by screwing the bolt 18 into the shaft 13 and / or, for example, by welding the head part 12 to the shaft 13. Here, too, the bolt 18 can be made of a metallic material, in particular steel. The shaft 13 can be made at least partially of a plastic material, such as PC+SAN-I-GF30 or the like. Such a plastic material can have good heat resistance with a melting point of several hundred °C. For example, this plastic material can form an outer coating of the shaft 13 or of a core material, in particular a metallic one, of the shaft 13.

[0039] For further illustration, Fig. 5 shows a schematic, sectional perspective view of the fastening anchor 10 in a fourth variant. Here, too, the shaft 13 has an outer rib or compartment structure for creating a positive connection with the foam material 11. However, the shaft 13 here has an inner metal core 20, for example made of steel. This is surrounded or encased by the sheath 19, in particular a plastic-based sheath. The metal core 20 has a blind hole, which here, for example, is open towards the head part 12 and in which an internal thread can be provided. The bolt 18 of the head part 12 engages in this blind hole. This makes it possible, for example, to create a particularly precise or stable connection, in particular a screw connection, of the head part 12 to the metal core 20, i.e., to the shaft 13.Because the blind hole is not open in the direction away from the head part 12, it can be avoided that the foam material 11 interferes with the connection between the head part 12 and the shaft 13. However, the shaft 13 could also be open in the direction away from the head part 12.

[0040] For further illustration, Fig. 6 shows a schematic, sectional perspective view of the fastening anchor 10 in a fifth variant. Here, the fastening anchor 10 is designed similarly to the fourth variant, but the shaft 13 has a different external shape.

[0041] For further illustration, Fig. 7 shows a schematic sectional view of the fastening anchor 10 in a sixth variant. Here, the shaft 13 of the fastening anchor 10 has openings 21 at various points along its longitudinal direction. These openings 21 penetrate the shaft 13 completely perpendicular to its longitudinal direction. Thus, the foam material 11 can penetrate these openings 21. The parts of the shaft 13, which appear disjoint here only due to the selected section plane, can of course be connected to one another in front of and / or behind the section or drawing plane. The shaft 13 can have one or more cavities 16, each of which can be open to one or more of the openings 21. Likewise, the parts of the shaft 13 located above and / or below the openings 21 in the longitudinal direction could, for example, be solid.The ends of each opening 21 can be arranged at the same position in the longitudinal direction, as shown here, or at different positions. Outside the openings 21, the shaft 13 can be straight or contoured, for example, as described in connection with the other variants of the fastening anchor 10. Likewise, the head portion 12 of the fastening anchor 10 can be designed here, for example, as described in connection with the other variants of the fastening anchor 10. Likewise, here too, the fastening anchor 10 can have, for example, the threaded rod 17 or the bolt 18 and / or the sheath 19 and / or the metal core 20.

[0042] The properties or features of the various variants of the fastening anchor 10 shown here as examples can also be combined in a different way and / or with further or different features or properties. For example, the fastening anchor 10 could be designed similarly to the fifth variant, but the shaft 13 could be Fig.6 could have an end opening to a cavity 16 according to the first or second variant. Likewise, the shaft 13 according to the first or second variant of the fastening anchor 10 could have an external rib or compartment structure according to the third or fourth variant. Likewise, the different described connection or fastening options of the head part 12 to the shaft 13 can be interchangeable between the different variants. Likewise, other shapes or variations of the fastening anchor 10 are possible. For example, the exact number of ribs or compartments or the areas of different diameters of the shaft 13 is not limited to the variants shown here as examples.

[0043] Overall, the described examples show how a fastening anchor 10 can be realized and used in a high-voltage storage device in order to create an additional load path, whereby a corresponding housing part can be prevented from detaching from the rest of the high-voltage storage device, in particular from a cell cluster of the battery cells 7. List of reference symbols 1 motor vehicle 2 energy storage units 3 housings 4 Lower housing part 5 Upper housing part 6 Interior 7 battery cells 8 Cell contact system 9 Battery electronics 10 fixing anchors 11 Foam material 12 headboard 13 shaft 14 through hole 15 screw sleeve 16 cavity 17 Threaded rod 18 bolts 19 Sheathing 20 metal core 21 breakthroughs QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 009 505 A1

[0003] DE 10 2019 210 057 A1

[0004] WO 2020 / 109 714 A1

[0005]

Claims

[1] Energy storage device (2) comprising a housing (3) and a plurality of battery cells (7) arranged in an interior space (6) of the housing (3), wherein a fastening anchor (10) is fastened to a housing part (5) which delimits the interior space (6) on one side and projects into the interior space (6) of the housing (3), and in the interior space (6) of the housing (3), the battery cells (7) and the fastening anchor (10) are foamed around with a foam material (11), so that a holding connection between the cured foam material (11) and the fastening anchor (10) is produced. [2] Energy storage device (2) according to claim 1, characterized by in that the battery cells (7) are arranged in a predetermined regular pattern, wherein a space in the pattern is occupied by the fastening anchor (10) instead of a battery cell (7), in particular with an envelope shape of a part of the fastening anchor (10) projecting into the housing (3) corresponding to the shape of one of the battery cells (7). [3] Energy storage device (2) according to one of the preceding claims, characterized by in that the fastening anchor (10) has a head part (12) fastened to the housing (3) and a shaft (13) connected thereto, which extends from the head part (12) into the interior (6) of the housing (3), wherein the shaft (13) has different diameters in certain regions along its longitudinal extent, in particular at least one opening to a hollow interior region (16) of the fastening anchor (10) and / or at least one opening passing through the shaft (13), so that a positive connection with the cured foam material (11) is thus produced. [4] Energy storage device (2) according to one of the preceding claims, characterized byin that the fastening anchor (10) has a head part (12) fastened to the housing (3) and a shaft (13) connected thereto, which extends from the head part (12) into the interior (6) of the housing (3), wherein the shaft (13) is hollow at least in a region facing away from the housing part (5) and is open in the direction facing away from the housing part (5). [5] Energy storage device (2) according to one of the preceding claims, characterized by that the fastening anchor (10) has a head part (12) fastened to the housing (3) and a shaft (13) connected thereto, which extends from the head part (12) into the interior (6) of the housing (3), wherein the head part (12) is welded to the shaft (13). [6] Energy storage device (2) according to one of the preceding claims, characterized byin that the fastening anchor (10) has a head part (12) fastened to the housing (3) and a shaft (13) connected to it, which extends from the head part (12) into the interior (6) of the housing (3), wherein the head part (12) has a through-hole (14) with an internal thread and the shaft (13) is hollow and designed with an internal thread at least in its region facing the head part (12), and the shaft (13) is connected to the head part (12) by means of a threaded rod (17) which is screwed into the internal threads of the head part (12) and the shaft (13). [7] Energy storage device (2) according to one of the preceding claims, characterized byin that the fastening anchor (10) has a head part (12) and a shaft (13) connected thereto, which extends from the head part (12) into the interior (6) of the housing (3), wherein the shaft (13) is hollow at least in its region facing the head part (12) and the head part (12) has a bolt (18) which projects into the hollow region of the shaft (13) and is held there on the latter. [8] Energy storage device (2) according to one of the preceding claims, characterized by that the fastening anchor (10) has a steel core (20) which is surrounded by a plastic material (19). [9] Motor vehicle (1), comprising an energy storage device (2) according to one of the preceding claims, in particular as a traction battery. [10] Method for manufacturing an energy storage device (2) according to one of claims 1 to 8, wherein - a housing (3) for accommodating a plurality of battery cells (7) is provided, - several battery cells (7) are arranged in the housing (3), - the battery cells (7) are covered with a foam material (11), - before or after the foaming of the battery cells (7), a fastening anchor (10) is arranged next to or between the battery cells (7) so that it is also foamed by the foam material (11) at least after the foaming, - the fastening anchor (10) is fastened to the housing (3) before or after its arrangement next to or between the battery cells (7), - the foam material (11), in particular after the fastening anchor (10) has been arranged next to or between the battery cells (7), hardens, so that a holding connection of the foam material (11) to the housing (3) via the fastening anchor (10) is achieved.

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