Electrical energy storage for a motor vehicle and motor vehicle

Abstract

The invention relates to an electrical energy storage device (10) for a motor vehicle, comprising a storage housing (12) whose receiving space (14) is partially bounded by a housing lower part as the first housing part (15) of the storage housing (12) and partially by a housing cover formed separately from the housing lower part and connected to the housing lower part as the second housing part (16) of the storage housing (12), and with storage cells arranged in the receiving space (14) for storing electrical energy, comprising at least one reinforcing element (20) formed separately from the housing parts (15, 16) and attached to the housing cover, which has a reinforcing area (24) reinforcing at least one partial area (TB) of the housing cover and a bulkhead area (26) projecting from the housing cover towards the housing lower part, which is arranged between at least two of the storage cells.

Description

The invention relates to an electrical energy store for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1.DE 10 2010 043 899 A1 discloses a battery housing for receiving at least one battery cell as known. Furthermore, DE 10 2016 110 330 A1 discloses a housing for a vehicle battery. DE 10 2022 201 088 A1 discloses an electric vehicle battery pack with longitudinal reinforcement. DE 10 2022 101 036 B3 discloses a cover unit for closing a battery housing of an electrically driven vehicle.It is the object of the present invention to provide an electrical energy store for a motor vehicle and a motor vehicle having at least one such electrical energy store, so that a particularly advantageous design of the electrical energy store can be realized.This object is achieved by an electrical energy store having the features of patent claim 1 and by a motor vehicle having the features of patent claim 10. Advantageous embodiments with expedient developments of the invention are specified in the other claims.A first aspect of the invention relates to an electrical energy store, also referred to simply as a store or energy store, for a motor vehicle, also referred to simply as a vehicle, the interior of which, also referred to as a passenger compartment, passenger compartment or cabin, is formed, for example, by a body, also referred to as a superstructure and preferably formed as a self-supporting body. During a trip of the motor vehicle, persons such as, for example, the driver or the driver of the motor vehicle can be present in the interior of the motor vehicle. The electrical energy store is preferably a high-voltage component, the electrical voltage of which, in particular an electrical operating voltage or rated voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and is very preferably several hundred volts. The electrical energy store is also referred to as a battery and is in particular a secondary battery. In particular when the electrical energy store is a high-voltage component, the electrical energy store is also referred to as a high-voltage battery (HV battery). The motor vehicle is preferably a hybrid vehicle or an electric vehicle, in particular a battery-electric vehicle (BEV).The electrical energy store has a storage housing, also referred to as a housing, which delimits a receiving space, in particular directly. In particular, the receiving space is bounded, in particular directly, by an inner circumferential lateral surface of the storage housing. The storage housing has a housing lower part, also referred to simply as a lower part, by means of which the receiving space is partially and preferably directly delimited. Thus, a first part of the receiving space is bounded, in particular directly, by the housing lower part. Thus, for example, the housing lower part forms a first part of the inner-circumferential-side lateral surface, wherein the first part of the receiving space is bounded, in particular directly, by the first part of the inner-circumferential-side lateral surface. The storage housing also has a housing cover, also referred to as a cover, by means of which the receiving space is partially and preferably directly delimited in the process. Thus, a second part of the receiving space is bounded, in particular directly, by the housing cover. Thus, for example, the housing cover forms a second part of the outer circumferential surface, wherein the second part of the receiving space is bounded, in particular directly, by the second part of the inner circumferential surface. The housing lower part is also referred to as a first housing part or is a first housing part of the storage housing. The housing cover is also referred to as a second housing part or is a second housing part of the storage housing. The housing parts are formed separately from one another and are connected to one another at least indirectly, in particular directly.The electrical energy store also has storage cells, which are also simply referred to as cells and which are formed separately from one another and separately from the storage housing. The storage cells are arranged in the receiving space and thus in the memory housing. By means of the storage cells, that is to say in the storage cells, electrical energy is to be stored or stored, in particular electrochemically. In particular, the memory cells are electrically connected to one another. The electrical energy store can provide the electrical energy stored in the storage cells, in particular electrochemically, in order to supply the electrical energy to at least one electric machine of the motor vehicle, for example, and the electrical machine can thereby be operated in a motor mode and thus as an electric motor, by means of which the motor vehicle can be driven electrically, in particular purely. For example, first of the memory cells form a first memory module, and for example, second of the memory cells form a second memory module, wherein the memory modules are arranged in the receiving space and thus in the memory housing. In particular, the memory modules are electrically connected to one another.In order to be able to realize a particularly advantageous construction of the electrical energy store, it is provided according to the invention that the electrical energy store has at least one reinforcing element which is formed separately from the housing part and separately from the storage cells and is fastened to the housing cover. The housing cover is preferably formed from a metallic material. Alternatively or additionally, the lower housing part is formed from a metallic material. Alternatively or additionally, the reinforcing element is formed from a metallic material. It is preferably provided that the housing lower part and preferably also the housing cover are formed separately from the body. In the fully manufactured state of the motor vehicle having the body and the electrical energy store, the storage housing, which is formed in particular separately from the body, is arranged on the body, in particular on a floor of the body. In this case, for example, the storage housing and thus the housing parts of the storage housing are arranged below the floor in the vehicle vertical direction of the motor vehicle, in particular in such a way that the storage housing and preferably also the storage cells are overlapped by the floor at least partially, in particular at least predominantly and thus at least to more than half or else completely, in the vehicle vertical direction of the motor vehicle. For example, the interior of the motor vehicle is at least partially, in particular at least predominantly and thus at least to a greater than half or even completely, overlapped, in particular bounded, by the floor in the vehicle vertical direction of the motor vehicle downwards.The reinforcing element has a reinforcing region by which at least or exactly a partial region of the housing cover is reinforced. Thus, the housing cover is preferably locally reinforced by the reinforcing region, since the partial region is preferably reinforced as a single partial region of the housing cover by the reinforcing region. In particular, it is provided that in the installation position of the electrical energy store, which assumes its installation position in the completely produced state of the motor vehicle, the receiving space is delimited, in particular directly, at least partially, in particular at least predominantly and thus at least to the extent of more than half or else completely, by the housing cover in the vehicle vertical direction of the motor vehicle upwards. Alternatively or additionally, it is provided, for example, that in the installed position of the electrical energy store, the receiving space is delimited, in particular directly, downward at least partially, in particular at least predominantly and thus at least to an extent of more than half or else completely, by the housing lower part. It is very preferably provided that, in the installation position of the electrical energy store, a part of the receiving space, also referred to as a space part, is delimited upwards in the vehicle vertical direction of the motor vehicle by the said partial region of the housing cover. In particular, it is provided that, in the installation position of the electrical energy store, the housing lower part is arranged at least partially, in particular at least predominantly and thus at least to the extent of more than half or else completely, below the housing cover, that is to say further below than the housing cover. In particular, it is provided that the reinforcing element is arranged, in particular completely, on an inner side of the housing cover facing the receiving space and thus in particular facing the housing lower part.Furthermore, the reinforcing element has a bulkhead wall region which projects from the housing cover toward the housing lower part and is arranged between at least two of the storage cells, in particular between the said storage modules. In particular, it is provided that in the installation position of the electrical energy store, the bulkhead wall region protrudes downward from the housing cover in the vehicle vertical direction of the motor vehicle. In this case, the bulkhead wall region is arranged, for example in the installation position of the electrical energy store, along a direction running perpendicular to the vehicle vertical direction of the motor vehicle between the at least two storage cells, in particular the storage modules.The bulkhead wall region is arranged between a first wall region of the housing cover and a second wall region of the housing lower part. The wall regions are situated opposite one another, for example, in the installation position of the electrical energy store in the vehicle vertical direction of the motor vehicle, with the result that the bulkhead wall region is arranged between the wall regions, for example, in the installation position of the electrical energy store in the vehicle vertical direction of the motor vehicle. In this case, it is provided in particular that, in the installation position of the electrical energy store, the receiving space is partially overlapped in the vehicle vertical direction toward the top by the first wall region and in the vehicle vertical direction toward the bottom by the second wall region. The wall regions are spaced apart from one another when the housing lower parts are viewed alone, such that a distance extends between the wall regions. In the installation position of the electrical energy store, for example, the said distance between the wall regions extends in the vehicle vertical direction. In this case, the bulkhead wall region, in particular in the installation position of the electrical energy store, protrudes downward in the vehicle vertical direction of the motor vehicle, from the first wall region toward the second wall region. It is very preferably provided that the bulkhead region, in particular in the installed position of the electrical energy store in the vehicle vertical direction of the motor vehicle, extends over more than half of the distance, in particular the entire distance, so that, for example, at least more than half of the distance, in particular the entire distance, is bridged by the bulkhead region. On the one hand, a particularly advantageous spatial separation of the at least two storage cells, between which the partition wall region is arranged, can be realized by the partition wall region. This makes it possible, for example, to prevent a thermal event occurring at one of the two storage cells from undesirably overlapping the other of the at least two storage cells, or such overlapping of a thermal event can be delayed in time in a particularly advantageous manner. As a result, for example, an undesired thermal propagation can be avoided or advantageously delayed in time. If, for example, a thermal event occurs at one of the two storage cells, then, for example, a hot gas and particles flow out of the one storage cell. The spatial separation of the two storage cells effected or effected by means of the bulkhead region can prevent the other of the two storage cells from being excessively charged with the gas and the particles, such that the thermal event does not transition from the one storage cell to the other storage cell, or such that such a transition of the thermal event from the one storage cell to or to the other storage cell can advantageously be delayed in time. Thus, by means of the bulkhead region, an excessive thermal load on the other, still intact storage cell due to the thermal event that occurred to the one storage cell can be avoided. On the other hand, the housing cover can be advantageously reinforced by means of the reinforcing element. The reinforcing element is thus assigned at least one dual function: On the one hand, the reinforcing element is used to reinforce the housing cover. On the other hand, the reinforcing element is used to separate the at least two storage cells spatially from one another. Since the reinforcing element is fastened directly to the housing cover, the housing cover and the reinforcing element connected directly to the housing cover form a structural unit, also referred to as delivery periphery (LU), which can be produced, for example, at least partially parallel to the housing lower part in terms of time. In addition, the structural unit can be connected to the lower housing part simply and thus in a time- and cost-effective manner after its, in particular complete, production, in particular in that the housing cover is connected to the lower housing part, in particular directly or at least indirectly. As a result, the electrical energy store can be produced in a time-efficient and cost-effective manner.The reinforcing element is fastened directly to the housing cover. As a result, the housing cover and the reinforcing element form the structural unit in a particularly advantageous manner, so that a particularly advantageous construction of the electrical energy store can be realized and the electrical energy store can be produced in a time-efficient and cost-effective manner.In order to be able to reinforce the partial region of the housing cover particularly effectively and efficiently, it is provided in the invention that the reinforcing region bears directly and flatly against the partial region of the housing cover.In order to be able to realize a particularly advantageous construction of the electrical energy store, it is provided in the invention that the housing cover has a first through-opening which is formed in the partial region of the housing cover and thus penetrates completely through the partial region of the housing cover and is continuous, in particular completely, along its first through-direction. For example, in the installation position of the electrical energy store, the first passage direction runs in the vehicle vertical direction of the motor vehicle. The first through-opening is surrounded in a completely encircling manner by the partial region of the housing cover along its circumferential direction running around the first through-direction and is in this case bounded, for example, directly by the partial region of the housing cover. In the reinforcing region of the reinforcing element, a second through opening is preferably formed, which is in particular completely continuous along its second through direction. In the installation position of the electrical energy store, for example, the second passage direction runs in the vehicle vertical direction of the motor vehicle. The second through-opening is arranged in an overlapping manner with the first through-opening, such that the through-openings overlap each other at least partially. Thus, for example, the directions of passage coincide. The second through-opening is surrounded in a completely encircling manner by the reinforcing region along its circumferential direction running around the second through-direction and is in this case bounded, for example, directly by the reinforcing region. The partial region can be advantageously reinforced by means of the reinforcing region, so that, for example, in the event of a thermal event of one of the storage cells, excessive damage and / or deformation of the housing cover can be avoided. A particularly advantageous construction can thereby be realized. The background of this embodiment is in particular that a high internal pressure can arise in the receiving space from a thermal event occurring at one of the storage cells. If no countermeasure is taken, the internal pressure can, for example, lead to the housing cover formed, for example, from a metal sheet and thus formed as a metal sheet component tearing out at the first through-opening, wherein, however, now by means of the reinforcing region such excessive tearing out of the housing cover at the first through-opening or the region of the first through-opening can be avoided.For example, the reinforcing element is formed from a sheet metal, such that, for example, the reinforcing region is or is formed as a reinforcing sheet metal. A local increase in the thickness of a wall thickness of the structural unit is realized by the reinforcing region, since, for example, the housing cover has a first wall thickness when the housing cover is viewed alone and the reinforcing region has a second wall thickness when the reinforcing element is viewed alone. Since the reinforcing region adjoins the partial region of the housing cover, in particular towards the receiving space, the aforementioned structural unit has a total wall thickness in a first region of the structural unit comprising the reinforcing region and the partial region of the housing cover, which total wall thickness results from the sum of the first wall thickness and the second wall thickness. In a second region of the structural unit, which region adjoins, for example, directly the first region of the structural unit and the second region of which is free of the reinforcing element, such that, in the second region of the structural unit, with respect to the reinforcing element and the housing cover, only the housing cover is arranged, it has a second total wall thickness which is smaller than the first total wall thickness and is formed, for example, with respect to the first wall thickness and the second wall thickness, exclusively by the first wall thickness. This allows a local reinforcement of the housing cover to be realized, so that a particularly advantageous construction of the energy store can be produced.A further embodiment is distinguished in that a connecting element provided on the housing lower part, by means of which connecting element the housing parts are connected to one another and / or the electrical energy store is fastenable or fastened to the body of the motor vehicle, passes through, and therefore penetrates, through openings. This allows a particularly space-saving and weight-saving and thus advantageous construction of the electrical energy store to be represented.In order to be able to realize a particularly advantageous construction of the electrical energy store, it is provided in a further embodiment of the invention that the connecting element is designed as a screw element which has an external thread as the first thread. For example, the connecting element is or functions as a tie rod, by means of which the housing parts can be connected to one another in a particularly advantageous manner and / or the electrical energy store can be connected to the vehicle body in a particularly advantageous manner.In order to realize a particularly advantageous construction, it has proven particularly advantageous if an internal thread of a further connecting element arranged on an outer side of the storage housing facing away from the receiving space is directly screwed to the external thread, so that, for example, the housing parts are connected to one another by means of the further connecting element and / or the electrical energy store is fastened or can be fastened to the vehicle body by means of the further connecting element. In particular, the further connecting element is formed separately from the first connecting element.In a further, particularly advantageous embodiment of the invention, it is provided that the partition wall region has two partition walls which are spaced apart from one another in particular along the aforementioned direction and are arranged between the storage cells, in particular the storage modules, in particular along the aforementioned direction. As a result, the storage cells can be separated from one another in a particularly advantageous manner in terms of space, so that a particularly high level of safety can be provided.It is preferably provided that the reinforcing element is fastened to the housing cover, bypassing the housing lower part. This means that the reinforcing element is not fastened to the housing cover or is not fastened to the housing cover only via the housing lower part. It has been found to be particularly advantageous if the reinforcing element is fastened to the housing cover with complete bypassing of the housing lower part, so that the reinforcing element, as considered overall, is not fastened to the housing cover with the aid of the housing lower part. As a result, the aforementioned structural unit can be formed particularly advantageously, so that the electrical energy store can be produced particularly time-saving and cost-effective.A second aspect of the invention relates to a motor vehicle which is also referred to simply as a vehicle and is preferably designed as a motor vehicle, in particular as a passenger car, and the interior of which, which is also referred to as a passenger compartment, passenger compartment or cabin, is formed by a body which is also referred to as a superstructure and is preferably designed as a self-supporting body. The motor vehicle according to the second aspect of the invention has at least one electrical energy store according to the first aspect of the invention. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.Further advantages, features and details of the invention will become apparent from the following description of a preferred exemplary embodiment and with reference to the drawing. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination but also in other combinations or alone without departing from the scope of the invention.The drawing shows in: FIG. 1 shows a schematic perspective view of an electrical energy store for a motor vehicle; FIG. 2 shows a schematic perspective view of a portion of a housing lower part of the electrical energy store; FIG. 3 shows a schematic and sectional perspective view of a portion of the electrical energy store; FIG. 4 shows a schematic perspective view of a structural unit of the electrical energy store, the structural unit of which comprises a housing cover of the electrical energy store and a reinforcing element of the electrical energy store; FIG. 5 shows a schematic top view of the structural unit in detail; FIG. 6 is a schematic perspective view of the reinforcing member; FIG. 7 shows a schematic plan view of the electrical energy store; and FIG. 8 shows a schematic sectional view of the electrical energy store in a section plane designated in FIG. 7A-A.In the figures, identical or functionally identical elements are provided with the same reference numerals.FIG. 1 shows a schematic perspective view of an electrical energy store 10 for a motor vehicle, also referred to simply as a vehicle. The electrical energy store 10 is a high-voltage component and is therefore also referred to as a high-voltage battery (HV battery). The electrical energy store 10 has a storage housing 12 which delimits a receiving space 14, in particular directly, which can be partially seen from FIGS. 2, 3 to 4. The storage housing 12 has at least or exactly two housing parts which are formed separately from one another and are connected to one another at least indirectly, in particular directly, namely a first housing part 15 and a second housing part 16. The housing part 16 is also referred to as a lower part or housing lower part.The receiving space 14 is partially delimited by the housing part 15 and partially by the housing part 16, in particular directly in each case. This means that a first part of the receiving space 14, in particular directly, is delimited by the housing part 15 and a second part of the receiving space 14, in particular directly, is delimited by the housing part 16. In the installation position of the electrical energy store 10, which assumes its installation position in the completely produced state of the motor vehicle having the energy store 10, the receiving space 14 is delimited, in particular directly, upwards in the vehicle vertical direction of the motor vehicle, at least partially, in particular at least predominantly and thus at least to a greater than half or else completely, by the housing part 15. In the installed position of the electrical energy store 10, the receiving space 14 is delimited at least partially, in particular at least predominantly and thus at least to an extent of more than half or else completely, downward in the vehicle vertical direction of the motor vehicle by the housing part 16, in particular directly.The electrical energy store 10 also has storage cells which are formed separately from the storage housing 12 and are arranged in the receiving space 14 and thus in the storage housing 12 and are also simply referred to as cells and are respective individual cells. The latter means that the respective storage cells are formed separately from one another. In particular, the memory cells are electrically connected to one another. Electrical energy, in particular electrochemically, can be stored or stored by means of the storage cells. It can be seen from FIG. 3 that, for example, first of the memory cells form a first memory module 18 a, second of the memory cells form a second memory module 18 b, third of the memory cells form a third memory module 18 c, and fourth of the memory cells form a fourth memory module 18 d. The memory modules 18 a- dare arranged in the accommodation space 14. In particular, the memory modules 18 a- dare electrically connected to one another. The memory modules 18 a- dare also referred to simply as modules.FIG. 2 shows a schematic and perspective top view of the part 16 of the housing. In FIG. 4, the housing part 15 is shown in a schematic and perspective bottom view. It can be seen from FIG. 4 that the electrical energy store 10 comprises at least one reinforcing element 20 which is formed separately from the housing parts 15 and 16 and which is fastened, in particular directly, to the housing part 15. It can be seen from FIG. 4 that the housing part 15 has an inner side 22 facing the receiving space 14, which inner side, in particular in the installed position of the electrical energy store 10, points downwards in the vehicle vertical direction of the motor vehicle. In particular, in the installation position of the electrical energy store 10, the receiving space 14 is delimited in the vehicle vertical direction upwards, in particular directly, by the inner side 22. Furthermore, it is provided that the storage cells, for example in the installed position of the electrical energy store 10, are each at least partially, in particular at least predominantly or completely, overlapped by the inner side 22 in the vehicle vertical direction of the motor vehicle upwards. The reinforcing element 20 bears directly against the inner side 22. In particular, the reinforcing element 20 is fastened directly to the inner side 22. At least or in the present case exclusively a partial region TB of the housing part 15 is reinforced by the reinforcing element 20, so that the housing part 15 is reinforced by the reinforcing element 20, in particular exclusively locally and specifically in its partial region TB.The reinforcing element 20 can be seen particularly well from FIGS. 5, 6 and 8. It can be seen particularly well from FIG. 6 that the reinforcing element 20 has a reinforcing region 24, by means of which at least or in the present case exclusively the subregion TB of the housing part 15 is reinforced, such that the housing part 15 is locally reinforced by the reinforcing region 24, in particular exclusively. Furthermore, the reinforcing element 20 has a bulkhead wall region 26 which projects from the housing part 15, in particular from the inner side 22, toward the housing part 16 and is arranged between at least two of the storage cells. In the exemplary embodiment shown in the figures, the bulkhead region 26 is arranged between the storage modules 18 cand 18 d, as a result of which at least respective partial regions of the storage modules 18 cand 18 dare spatially separated from one another. If, for example, a thermal event occurs at one of the storage modules 18 c, d, the aforementioned spatial separation can prevent the thermal event from overlapping from one of the storage modules 18 c, dto the other of the storage modules 18 c, dorring excessively quickly. As a result, a thermal propagation or an excessively rapid propagation of the thermal propagation can be avoided, so that a particularly high level of safety can be provided. In particular, the bulkhead region 26 can avoid that, if hot gas and particles emerge from the one of the storage modules 18 c, don the other of the storage modules 18 c, don the gas and particles being excessively strongly impinged. In addition, an excessive thermal stress of the other of the memory modules 18 c, dresulting from the thermal event can be avoided.The housing part 15 has a first through-opening 28 formed in the sub-region TB, which is continuous along its first through-direction and thus, for example, completely penetrates the sub-region TB and thus the housing part 15 along the first through-direction. In the installed position of the electrical energy store 10, the first direction of passage coincides with the vehicle vertical direction of the motor vehicle. The first through-opening 28 is surrounded in a completely encircling manner by the sub-region TB along its first circumferential direction and is in this case bounded in particular directly by the sub-region TB, wherein the first circumferential direction of the first through-opening 28 runs around the first through-direction of the first through-opening 28.It can be seen from FIG. 6 that a second through-opening 30 is formed in the reinforcing region 24, which second through-opening penetrates the reinforcing region 24 and thus the reinforcing element 20 completely along its second direction of rotation. The second through-opening 30 is completely surrounded by the reinforcing region 24 along its second circumferential direction and in this case is in particular directly bounded by the reinforcing region 24. The second circumferential direction of the second through-opening 30 extends around the second through-direction of the second through-opening 30. In the installed position of the electrical energy store 10, the second passage direction of the second passage opening 30 runs in the vehicle vertical direction of the motor vehicle. It can be seen from FIG. 5 that the through openings 28 and 30 are arranged in at least partial mutual overlap, so that for example the through directions coincide.It can be seen from FIG. 2 that a connecting element 32 is provided on the housing part 16. It can also be seen that the housing part 16 has a second inner side 34, which faces the first inner side 22 of the housing part 15. In the installed position of the electrical energy store 10, the second inner side 34 points upward in the vehicle vertical direction of the motor vehicle. The second inner side 34 faces the receiving space 14. In particular, in the installation position of the electrical energy store 10, the receiving space 14 is delimited at least partially, in particular at least predominantly and thus at least to more than half or else completely, by the second inner side 34 in the vehicle vertical direction of the motor vehicle downwards. In the installation position of the electrical energy store 10, the connecting element 32 protrudes upward from the inner side 34 in the vehicle vertical direction. In a first embodiment, for example, the housing parts 15 and 16 are connected to one another by means of the connecting element 32. In a second embodiment of the electrical energy store 10 of the motor vehicle, which is provided alternatively or additionally to the first embodiment and the interior of which, also referred to as passenger compartment, passenger compartment or cabin, is formed by a body, also referred to as a body and preferably formed as a self-supporting body, the electrical energy store 10 formed separately from the body is fastened to the body by means of the connecting element 32.The connecting element 32 penetrates the through-openings 28 and 30. in other words, the connecting element 32 penetrates the through-openings 28 and 30. In the exemplary embodiment shown in the figures, the connecting element 32 is designed as a screw element which has a first thread. Most preferably, the first thread is an external thread. For example, a second screw element, which is not recognizable in the figures and which has a second thread corresponding to the first thread, is provided. Preferably, this faces an internal thread. Preferably, the screw elements are screwed to one another, in particular directly, in particular in that the mentioned threads are screwed to one another, in particular directly, that is to say are screwed into one another. By screwing the screw elements together, the housing parts 15 and 16 are connected to one another and / or the energy store 10 is fastened to the vehicle body. Because the screw elements are screwed to one another, in particular directly, a screw connection is formed by means of which the housing parts 15 and 16 are connected to one another and / or the electrical energy store 10 is fastened to the vehicle body. Since the connecting element 32 is preferably designed as a tie rod, the screw connection is preferably designed as a tie rod screw connection.If, for example, a thermal event occurs at one of the storage cells, a high internal pressure can arise in the receiving space 14. By means of the reinforcing region 24, the reinforcing region 24 being used to reinforce the subregion TB, it is possible to prevent undesired tearing of the housing part 15 at the said high internal pressure. Preferably, the housing part 15 is formed from a sheet metal. Due to the local reinforcement of the housing part 15 brought about by means of the reinforcement element 20, the weight of the storage housing 12 can be advantageously kept low overall.For example, the second screw element is arranged on an outer side 34 of the storage housing 12 facing away from the receiving space 14 and facing a vicinity of the storage housing 12, in particular of the energy store 10 as a whole.In order to be able to realize a particularly advantageous spatial separation of the storage modules 18 cand 18 d, it is provided in the exemplary embodiment shown in the figures that the bulkhead region 26 has, in particular precisely, two bulkhead walls 36 and 38 spaced apart from one another. It is preferably provided that the partition walls 38 and 36 are formed integrally with one another, i.e. are formed from a single piece. Furthermore, it is preferably provided that the reinforcement region 24 and the bulkhead region 26 are formed integrally with one another, and are therefore formed from a single piece. The reinforcing element 20 is preferably formed from a metallic material, in particular from a metal sheet. In order to be able to advantageously reinforce the partial region TB, it is preferably provided that the reinforcement region 24 bears directly and flatly against the partial region TB of the housing cover (housing part 15). It is very preferably provided that the reinforcing element 20 is fastened directly to the housing cover, in particular in such a way that the reinforcing element 20 is fastened to the housing cover (housing part 15) with completely complete bypassing of the housing lower part (housing part 16). FIG. 7 shows a schematic bottom view of the storage housing 12; FIG. 8 shows a section in a schematic sectional view along a sectional plane A-A of the energy storage device 10; particularly clearly visible from FIG. 8 is the reinforcing element 20 with the bulkhead region 26. Preferably, the reinforcing element 20 is fastened, in particular directly fastened, to the housing part 15 in such a way that the reinforcing element 20 is welded, in particular directly, to the housing part 15. In particular, the reinforcing element 20 is welded to the housing part 15 forming a plurality of welded connections, in particular directly, wherein, for example, the respective welded connection is a respective welded point. Thus, for example, the reinforcing element 20 is welded, in particular directly, to the housing part 15 by spot welding and is thereby fastened to the housing part 15. The welded connections are illustrated in FIG. 8 by double arrows.Because the reinforcing element 20 is fastened to the housing part 15, in particular directly and preferably with complete bypassing of the housing part 16, the housing part 15 and the reinforcing element 20 connected separately from the housing part 15 and, in particular directly, via the housing part 15 form a structural unit 40, which is also referred to as the delivery periphery. Due to the described welded connections and due to the bulkhead region 26, the structural unit 40 acquires an advantageously high rigidity against deformation, in particular when a high internal pressure occurs in the receiving space 14 due to a thermal event, for example.

Claims

Electrical energy store (10) for a motor vehicle, having a storage housing (12), the receiving space (14) of which is delimited partly by a housing lower part as a first housing part (15) of the storage housing (12) and partly by a housing cover, which is formed separately from the housing lower part and is connected to the housing lower part, as a second housing part (16) of the storage housing (12), having storage cells arranged in the receiving space (14) for storing electrical energy, and having at least one reinforcing element (20), which is formed separately from the housing parts (15, 16) and is fastened directly to the housing cover and has a reinforcing region (24) reinforcing at least one partial region (TB) of the housing cover and a bulkhead wall region (26) projecting from the housing cover toward the housing lower part and is arranged between at least two of the storage cells, characterized in that, the reinforcing region (24) resting directly and flatly against the partial region (TB) of the housing cover, wherein: the housing cover has a first through opening (28) formed in the partial region (TB) of the housing cover, which is surrounded in a completely encircling manner by the partial region (TB) along its circumferential direction; and a second through opening (30) arranged in an overlapping manner with the first through opening (28) is formed in the reinforcing region (24), which is surrounded in a completely encircling manner by the reinforcing region (24) along its circumferential direction.Electrical energy store (10) according to Claim 1, characterized in that a connecting element (32) provided on the housing lower part, by means of which connecting element the housing parts (15, 16) are connected to one another and / or the electrical energy store (10) can be fastened to a body of the motor vehicle, passes through the passage openings (28, 30).Electrical energy store (10) according to Claim 2, characterized in that the connecting element (32) is designed as a screw element which has a first thread.Electrical energy store (10) according to Claim 3, characterized in that a second thread of a further connecting element arranged on an outer side (35) of the store housing (12) facing away from the receiving space (14) is directly screwed to the first thread.Electrical energy store (10) according to one of the preceding claims, characterized in that the partition wall region (26) has two partition walls (36, 38) which are spaced apart from one another and are arranged between the storage cells.Electrical energy store (10) according to one of the preceding claims, characterized in that the reinforcing region (24) and the bulkhead wall region (26) are formed integrally with one another.Motor vehicle, having an electrical energy store (10) according to one of the preceding claims.

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