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

[0001] The invention relates to an electrical energy storage device for a motor vehicle, in particular for a motor car, according to the preamble of claim 1. Furthermore, the invention relates to a motor vehicle, in particular a motor car, with at least one such electrical energy storage device.

[0002] German patent application DE 10 2010 043 899 A1 discloses a battery housing for accommodating at least one battery cell. Furthermore, German patent application DE 10 2016 110 330 A1 discloses a housing for a vehicle battery.

[0003] The object of the present invention is to create an electrical energy storage device for a motor vehicle and a motor vehicle with at least one such electrical energy storage device, so that a particularly advantageous design of the electrical energy storage device can be realized.

[0004] This problem is solved by an electrical energy storage device with the features of claim 1 and by a motor vehicle with the features of claim 10. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] A first aspect of the invention relates to an electrical energy storage device, also referred to simply as a storage device or energy storage device, for a motor vehicle, also referred to simply as a vehicle, the interior of which, also referred to as the passenger compartment, passenger space, or cabin, is formed, for example, by a body, also referred to as the superstructure, preferably designed as a self-supporting body. During a journey, persons such as the driver of the motor vehicle may be present in the interior of the motor vehicle. Preferably, the electrical energy storage device is a high-voltage component whose electrical voltage, in particular its operating or nominal voltage, is preferably greater than 50 volts, particularly greater than 60 volts, and most preferably several hundred volts. The electrical energy storage device is also referred to as a battery and is, in particular, a secondary battery.Especially when the electrical energy storage device is a high-voltage component, it is also referred to as a high-voltage battery (HV battery). Preferably, the motor vehicle is a hybrid vehicle or an electric vehicle, particularly a battery electric vehicle (BEV).

[0006] The electrical energy storage device comprises a storage housing, also referred to as a casing, which defines a receiving space, particularly directly. Specifically, the receiving space is defined by an inner circumferential surface of the storage housing, particularly directly. The storage housing comprises a lower housing section, also referred to simply as a lower part, by which the receiving space is partially and preferably directly defined. Thus, a first part of the receiving space is defined, particularly directly, by the lower housing section. For example, the lower housing section forms a first part of the inner circumferential surface, wherein the first part of the receiving space is defined, particularly directly, by the first part of the inner circumferential surface. The storage housing also comprises a housing cover, also referred to as a lid, by which the receiving space is partially and preferably directly defined.Thus, a second part of the receiving space is bounded, in particular directly, by the housing cover. For example, the housing cover forms a second part of the inner 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 lower housing part is also referred to as the first housing part or is a first housing part of the storage housing. The housing cover is also referred to as the second housing part or is a second housing part of the storage housing. The housing parts are designed separately from one another and are connected to each other at least indirectly, in particular directly.

[0007] The electrical energy storage device also comprises storage cells, which are simply referred to as cells and are designed separately from each other and separate from the storage housing. The storage cells are arranged in the receiving space and thus within the storage housing. Electrical energy, particularly electrochemically, is stored or stored by means of the storage cells. In particular, the storage cells are electrically interconnected. The electrical energy storage device can provide the electrical energy stored in the storage cells, particularly electrochemically, to power, for example, at least one electric motor of the motor vehicle. This allows the electric motor to be operated as a motor, enabling the motor vehicle to be driven, particularly purely, electrically.For example, the first of the memory cells form a first memory module, and the second of the memory cells form a second memory module, the memory modules being arranged in the receiving space and thus in the memory housing. In particular, the memory modules are electrically connected to each other.

[0008] In order to achieve a particularly advantageous design of the electrical energy storage device, the invention provides that the electrical energy storage device has at least one reinforcing element, formed separately from the housing part and separately from the storage cells, which is attached to the housing cover. Preferably, the housing cover is made of a metallic material. Alternatively or additionally, the lower housing part is also formed of a metallic material. Preferably, the lower housing part and preferably also the housing cover are formed separately from the vehicle body.In the fully manufactured state of the motor vehicle, which comprises the body and the electrical energy storage system, the storage housing, which is designed separately from the body, is arranged on the body, particularly on a floor of the body. For example, the storage housing and thus the housing parts of the storage housing are arranged below the floor in the vertical direction of the motor vehicle, in particular such that the storage housing and preferably also the storage cells are at least partially, in particular at least predominantly and thus at least more than halfway or completely, overlapped by the floor in the 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 more than half or completely, overlapped by the floor in the vehicle's vertical direction downwards, and in particular limited.

[0009] The reinforcing element has a reinforcing area by which at least or exactly a partial area of ​​the housing cover is reinforced. Thus, the housing cover is preferably locally reinforced by the reinforcing area, since preferably the partial area is the only part of the housing cover reinforced by the reinforcing area. In particular, it is provided that, in the installed position of the electrical energy storage device, which assumes its installation position in the fully manufactured state of the vehicle, the receiving space in the vehicle's vertical direction is at least partially, and in particular at least predominantly, and thus at least more than halfway or completely, limited upwards by the housing cover, in particular directly.Alternatively or additionally, it is provided, for example, that in the installed position of the electrical energy storage device, the receiving space in the vehicle's vertical direction is at least partially, in particular at least predominantly and thus at least more than halfway or even completely, limited downwards by the lower housing part, in particular directly. Most preferably, it is provided that, in the installed position of the electrical energy storage device, a portion of the receiving space, also referred to as a compartment, is limited upwards by the aforementioned partial area of ​​the housing cover. In particular, it is provided that, in the installed position of the electrical energy storage device, the lower housing part is arranged at least partially, in particular at least predominantly and thus at least more than halfway or even completely, below the housing cover, i.e., further down than the housing cover.In particular, it is provided that the reinforcing element, especially completely, is arranged on an inner side of the housing cover facing the receiving space and thus, in particular, facing the lower part of the housing.

[0010] Furthermore, the reinforcing element has a bulkhead section projecting from the housing cover towards the lower housing part, which is arranged between at least two of the storage cells, in particular between the aforementioned storage modules. Specifically, it is provided that, in the installed position of the electrical energy storage device, the bulkhead section projects downwards from the housing cover in the vehicle's vertical direction. For example, in the installed position of the electrical energy storage device, the bulkhead section is arranged along a direction perpendicular to the vehicle's vertical direction between the at least two storage cells, in particular the storage modules.

[0011] The bulkhead section is located between a first wall section of the housing cover and a second wall section of the housing base. For example, when the electrical energy storage device is installed in the vehicle's vertical orientation, these wall sections face each other, so that the bulkhead section is positioned between them. Specifically, when the electrical energy storage device is installed, the receiving space is partially overlapped by the first wall section upwards and partially by the second wall section downwards. When considering only the housing bases, the wall sections are spaced apart, creating a gap between them.In the installed position of the electrical energy storage device, the aforementioned distance between the wall sections extends, for example, in the vehicle's vertical direction. The bulkhead section, particularly in the vehicle's vertical installation position, projects downwards from the first wall section towards the second. Most preferably, the bulkhead section, particularly in the vehicle's vertical installation position, extends over more than half of the distance, and in particular the entire distance, so that, for example, at least more than half of the distance, and in particular the entire distance, is bridged by the bulkhead section. On the one hand, the bulkhead section allows for a particularly advantageous spatial separation of the at least two storage cells between which it is arranged.This can, for example, prevent a thermal event occurring in one of the two storage cells from undesirably spreading to the other of the at least two storage cells, or advantageously delay such a spread. This can, for example, prevent or advantageously delay unwanted thermal propagation. If, for instance, a thermal event occurs in one of the two storage cells, hot gas and particles might escape from that cell.The spatial separation of the two storage cells, achieved or achievable by means of the baffle, prevents the other storage cell from being excessively exposed to the gas and particles. This prevents the thermal event from transferring from one storage cell to the other, or advantageously delays such a transfer. Thus, the baffle prevents excessive thermal stress on the other, still intact storage cell caused by the thermal event affecting the first. Furthermore, the reinforcing element can be used to advantageously strengthen the housing cover. The reinforcing element therefore has at least a dual function: firstly, it is used to reinforce the housing cover.Secondly, the reinforcing element is used to spatially separate the at least two storage cells. Since the reinforcing element is attached, in particular directly, to the housing cover, the housing cover and the reinforcing element, which is connected, in particular directly, to the housing cover, form a single assembly, also referred to as the scope of supply (SU), which can, for example, be manufactured at least partially concurrently with the lower housing part. Furthermore, once the assembly has been manufactured, in particular completely, it can be easily and therefore quickly and cost-effectively connected to the lower housing part, in particular by connecting the housing cover, in particular directly or at least indirectly, to the lower housing part. This allows the electrical energy storage device to be manufactured quickly and cost-effectively.

[0012] To achieve a particularly advantageous design of the electrical energy storage device, one embodiment provides that the housing cover has a first through-opening formed in a specific section of the housing cover, thus completely penetrating this section and being, in particular, completely unobstructed along its first through-direction. For example, in the installed position of the electrical energy storage device, the first through-direction runs in the vertical direction of the vehicle. The first through-opening is completely surrounded by the section of the housing cover along its circumferential direction, which extends around the first through-direction, and is thereby, for example, directly bounded by this section of the housing cover.A second through-opening is preferably formed within the reinforcement area of ​​the reinforcement element. This through-opening is, in particular, completely continuous along its second through-direction. For example, in the installed position of the electrical energy storage device, the second through-direction runs in the vertical direction of the vehicle. The second through-opening is arranged in overlap with the first through-opening, so that the through-openings at least partially overlap each other. Thus, for example, the through-directions coincide. The second through-opening is completely surrounded by the reinforcement area along its circumferential direction, which extends around the second through-direction, and is, for example, directly bounded by the reinforcement area.The reinforcement area allows for advantageous strengthening of the sub-section, preventing excessive damage and / or deformation of the housing cover in the event of a thermal event affecting one of the memory cells. This enables a particularly advantageous design. The rationale behind this embodiment is that a thermal event affecting one of the memory cells can generate high internal pressure within the receiving chamber. Without countermeasures, this internal pressure can, for example, cause the housing cover—constructed from a sheet metal component—to tear out at the first through-hole. However, the reinforcement area prevents such excessive tearing of the housing cover at the first through-hole or in the area surrounding it.

[0013] For example, the reinforcing element is formed from a sheet metal part, so that, for instance, the reinforcing area is or will be designed as a reinforcing sheet. The reinforcing area creates a local increase in the wall thickness of the assembly, since, for example, the housing cover has a first wall thickness when considered alone, and the reinforcing area has a second wall thickness when considered alone. Since the reinforcing area adjoins the partial area of ​​the housing cover, particularly towards the receiving space, the aforementioned assembly has a total wall thickness in a first region of the assembly 37, which comprises the reinforcing area and the partial area of ​​the housing cover. This total wall thickness is the sum of the first wall thickness and the second wall thickness.In a second section of the assembly, directly adjacent to the first section, and free of the reinforcing element, where only the housing cover is located in relation to the reinforcing element and the housing cover, the second section has a lower total wall thickness than the first. This lower wall thickness is formed, for example, solely by the thickness of the first wall. This allows for local reinforcement of the housing cover, resulting in a particularly advantageous design for the energy storage device.

[0014] Another embodiment is characterized in that a connecting element provided on the lower part of the housing, by means of which the housing parts are connected to one another and / or the electrical energy storage device can be attached to or fastened to the body of the motor vehicle, passes through the through-openings. This allows for a particularly space-saving and lightweight, and therefore advantageous, design of the electrical energy storage device.

[0015] To achieve a particularly advantageous design of the electrical energy storage device, a further embodiment of the invention provides that the connecting element is designed as a screw element with an external thread as its first thread. For example, the connecting element is or functions as a tie rod, by means of which the housing parts can be particularly advantageously connected to one another and / or the electrical energy storage device can be particularly advantageously attached to the vehicle body.

[0016] In order to achieve a particularly advantageous design, it has proven especially beneficial if the external thread is directly screwed to an internal thread of a further connecting element located on an outer surface of the storage housing facing away from the receiving space, so that, for example, the housing parts are connected to each other by means of the further connecting element and / or the electrical energy storage device is attached or can be attached to the vehicle body by means of the further connecting element. In particular, the further connecting element is designed separately from the first connecting element.

[0017] In a further, particularly advantageous embodiment of the invention, the bulkhead area comprises two bulkheads spaced apart from each other, particularly along the aforementioned direction, which are arranged between the storage cells, particularly the storage modules, particularly along the aforementioned direction. This allows the storage cells to be spatially separated from each other with particular advantage, thus enabling a particularly high level of security.

[0018] In order to reinforce the partial area of ​​the housing cover particularly effectively and efficiently, a further embodiment of the invention provides that the reinforcement area lies directly and flatly against the partial area of ​​the housing cover.

[0019] Finally, it has proven particularly advantageous to attach the reinforcing element directly to the housing cover. This allows the housing cover and the reinforcing element to form a highly efficient unit, resulting in a particularly advantageous design for the electrical energy storage device and enabling its timely and cost-effective production.

[0020] Preferably, the reinforcing element is attached to the housing cover without bypassing the lower housing part. This means that the reinforcing element is not attached to the housing cover, or not solely via the lower housing part. It has proven particularly advantageous if the reinforcing element is attached to the housing cover completely without bypassing the lower housing part, so that, overall, the reinforcing element is not attached to the housing cover via the lower housing part. This allows the aforementioned assembly to be formed particularly efficiently, enabling the electrical energy storage device to be manufactured in a particularly time- and cost-effective manner.

[0021] A second aspect of the invention relates to a motor vehicle, also referred to simply as a vehicle, and preferably designed as a motor car, in particular as a passenger car, the interior of which, also referred to as the passenger cell, passenger compartment, or cabin, is formed by a body, also referred to as the superstructure, and preferably designed as a self-supporting body. The motor vehicle according to the second aspect of the invention has at least one electrical energy storage device according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0022] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and combinations of features mentioned above in the description, as well as those mentioned below in the figure description and / or shown in the figures alone, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention.

[0023] The drawing shows in: Fig. 1 A schematic perspective view of an electrical energy storage device for a motor vehicle; Fig. 2. Partially a schematic perspective view of a lower housing part of the electrical energy storage device; Fig. 3. A schematic and cutaway perspective view of the electrical energy storage device; Fig. 4 a schematic perspective view of a component of the electrical energy storage device, the component of which comprises a housing cover of the electrical energy storage device and a reinforcement element of the electrical energy storage device; Fig. 5. Partial schematic top view of the building unit; Fig. 6 a schematic perspective view of the reinforcement element; Fig. 7 a schematic top view of the electrical energy storage device; and Fig. 8. Partially a schematic sectional view of the electrical energy storage system along a [path / section] Fig. 7 AA designated cutting plane.

[0024] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.

[0025] Fig. Figure 1 shows a schematic perspective view of an electrical energy storage device 10 for a motor vehicle, also referred to simply as a vehicle. The electrical energy storage device 10 is a high-voltage component and is therefore also called a high-voltage battery (HV battery). The electrical energy storage device 10 has a storage housing 12, which is partially made of Fig. The storage housing 12 has at least or exactly two separately formed and at least indirectly, in particular directly, connected housing parts, namely a first housing part 15 and a second housing part 16. The housing part 15 is also referred to as the cover or housing cover. The housing part 16 is also referred to as the lower part or housing lower part.

[0026] The receiving space 14 is partially bounded by the housing part 15 and partially by the housing part 16, in particular directly. This means that a first part of the receiving space 14 is bounded, in particular directly, by the housing part 15 and a second part of the receiving space 14 is bounded, in particular directly, by the housing part 16. In the installed position of the electrical energy storage device 10, which assumes its installed position in the fully manufactured state of the motor vehicle containing the energy storage device 10, the receiving space 14 is bounded upwards in the vertical direction of the motor vehicle at least partially, in particular at least predominantly and thus at least more than halfway or completely, by the housing part 15, in particular directly.In the installed position of the electrical energy storage device 10, the receiving space 14 in the vehicle's vertical direction is at least partially, in particular at least predominantly and thus at least more than half or completely, limited downwards by the housing part 16, in particular directly.

[0027] The electrical energy storage device 10 also has storage cells, which are formed separately from the storage housing 12 and arranged in the receiving space 14 and thus within the storage housing 12. These cells are also simply referred to as cells and are individual cells. The latter means that the individual storage cells are formed separately from one another. In particular, the storage cells are electrically connected to each other. Electrical energy, especially electrochemical energy, is stored or stored by means of the storage cells. Fig. Figure 3 shows that, for example, the first of the memory cells forms a first memory module 18a, the second of the memory cells a second memory module 18b, the third of the memory cells a third memory module 18c, and the fourth of the memory cells a fourth memory module 18d. The memory modules 18a-d are arranged in the receiving space 14. In particular, the memory modules 18a-d are electrically connected to each other. The memory modules 18a-d are also simply referred to as modules.

[0028] In Fig. Figure 2 shows a section of the housing part 16 in a schematic and perspective top view. Fig. Figure 4 shows housing part 15 in a schematic and perspective bottom view. Fig. 4 It is evident that the electrical energy storage device 10 has at least one reinforcing element 20, which is formed separately from the housing parts 15 and 16 and which is attached, in particular directly, to the housing part 15. Fig. Figure 4 shows that the housing part 15 has an inner surface 22 facing the receiving space 14, which, in particular, points downwards when the electrical energy storage device 10 is installed in the vehicle's vertical direction. Specifically, when the electrical energy storage device 10 is installed in the vehicle's vertical direction, the receiving space 14 is bounded upwards, and in particular directly, by the inner surface 22. Furthermore, it is provided that the storage cells, for example, when the electrical energy storage device 10 is installed in the vehicle's vertical direction, are each at least partially, and in particular at least predominantly or completely, overlapped upwards by the inner surface 22. The reinforcing element 20 rests directly against the inner surface 22. In particular, the reinforcing element 20 is attached directly to the inner surface 22.The reinforcing element 20 reinforces at least or exclusively a partial area TB of the housing part 15, so that the housing part 15 is reinforced locally by the reinforcing element 20, in particular exclusively, in its partial area TB.

[0029] The reinforcement element 20 is particularly well made of Fig. 5, Fig. 6 and Fig. 8 recognizable. Particularly good from Fig. As can be seen in Figure 6, the reinforcing element 20 has a reinforcing area 24 by means of which at least, or in this case exclusively, the partial area TB of the housing part 15 is reinforced, so that the housing part 15 is locally reinforced by the reinforcing area 24, in particular exclusively. Furthermore, the reinforcing element 20 has a partition wall area 26 projecting from the housing part 15, in particular from the inner side 22, towards the housing part 16, which is arranged between at least two of the memory cells. In the embodiment shown in the figures, the partition wall area 26 is arranged between the memory modules 18c and 18d, whereby at least the respective partial areas of the memory modules 18c and 18d are spatially separated from each other.If, for example, a thermal event occurs in one of the storage modules 18c, d, the aforementioned spatial separation prevents the thermal event from spreading from one storage module 18c, d to the other, or from spreading excessively quickly. This prevents thermal propagation or excessively rapid spread of thermal propagation, thus ensuring a particularly high level of safety. In particular, the bulkhead area 26 prevents the other storage module 18c, d from being excessively exposed to the gas and particles released from one of the storage modules 18c, d during the thermal event. Furthermore, it prevents excessive thermal stress on the other storage module 18c, d resulting from the thermal event.

[0030] The housing part 15 has a first through-opening 28 formed in the sub-area TB, which is continuous along its first through-direction and thus, for example, completely penetrates the sub-area TB and therefore the housing part 15 along its first through-direction. In the installed position of the electrical energy storage device 10, the first through-direction coincides with the vertical direction of the vehicle. The first through-opening 28 is completely surrounded by the sub-area TB along its first circumferential direction and is in particular directly bounded by the sub-area TB, with the first circumferential direction of the first through-opening 28 running around the first through-direction of the first through-opening 28.

[0031] Out of Fig. Figure 6 shows that a second through-opening 30 is formed in the reinforcement area 24, which completely penetrates the reinforcement area 24 and thus the reinforcement element 20 along its second direction of rotation. The second through-opening 30 is completely surrounded by the reinforcement area 24 along its second circumferential direction and is, in particular, directly bounded by the reinforcement area 24. The second circumferential direction of the second through-opening 30 runs around the second through-opening direction of the second through-opening 30. In the installed position of the electrical energy storage device 10, the second through-opening direction of the second through-opening 30 runs in the upward direction of the vehicle. This is evident from Fig. 5 is that the passage openings 28 and 30 are arranged in at least partial mutual overlap, so that, for example, the passage directions coincide.

[0032] Out of Fig. Figure 2 shows that a connecting element 32 is provided on the housing part 16. It is also apparent that the housing part 16 has a second inner surface 34, which faces the first inner surface 22 of the housing part 15. In the installed position of the electrical energy storage device 10, the second inner surface 34 faces upwards in the vehicle's vertical direction. The second inner surface 34 faces the receiving space 14. In particular, in the installed position of the electrical energy storage device 10, the receiving space 14 is at least partially, and in particular at least predominantly, and thus at least more than halfway or completely, bounded downwards by the second inner surface 34. In the installed position of the electrical energy storage device 10, the connecting element 32 projects upwards from the inner surface 34 in the vehicle's vertical direction.In a first embodiment, for example, the housing parts 15 and 16 are connected to each other by means of the connecting element 32. In a second embodiment of the electrical energy storage device 10 of the motor vehicle, which is provided as an alternative or additional to the first embodiment, and whose interior space, also referred to as passenger cell, passenger compartment or cabin, is formed by a body, also referred to as a superstructure and preferably designed as a self-supporting body, the electrical energy storage device 10, which is designed separately from the body, is attached to the body by means of the connecting element 32.

[0033] The connecting element 32 penetrates the through-openings 28 and 30. In other words, the connecting element 32 passes through the through-openings 28 and 30. Preferably, the connecting element 32 is designed as a tie rod. In the 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, not visible in the figures, is provided which has a second thread corresponding to the first thread. Preferably, the thread facing the first thread is an internal thread. Preferably, the screw elements are screwed together, in particular directly, especially by the fact that the aforementioned threads are screwed together, that is, screwed into one another.By screwing the screw elements together, the housing parts 15 and 16 are connected to each other and / or the energy storage device 10 is attached to the vehicle body. Because the screw elements are screwed together, particularly directly, a screw connection is formed by means of which the housing parts 15 and 16 are connected to each other and / or the electrical energy storage device 10 is attached 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 connection.

[0034] For example, if a thermal event occurs at one of the memory cells, a high internal pressure can develop in the receiving chamber 14. By means of the reinforcement area 24, which reinforces the sub-area TB, it is possible to prevent the housing part 15 from tearing out under this high internal pressure. Preferably, the housing part 15 is formed from a sheet metal part. The local reinforcement of the housing part 15 achieved by means of the reinforcement element 20 allows the overall weight of the memory housing 12 to be advantageously kept low.

[0035] For example, the second screw element is arranged on an outer surface 34 of the storage housing 12 facing away from the receiving space 14 and towards the environment of the storage housing 12, in particular the energy storage 10 as a whole.

[0036] To achieve a particularly advantageous spatial separation of the storage modules 18c and 18d, the embodiment shown in the figures provides that the bulkhead section 26, in particular, has two spaced-apart bulkheads 36 and 38. Preferably, the bulkheads 38 and 36 are formed integrally, i.e., from a single piece. Furthermore, it is preferably provided that the reinforcement section 24 and the bulkhead section 26 are formed integrally, i.e., from a single piece. Preferably, the reinforcement element 20 is made of a metallic material, in particular a sheet metal part. To advantageously reinforce the subsection TB, it is preferably provided that the reinforcement section 24 abuts directly and over its entire surface against the subsection TB of the housing cover (housing part 15).It is most preferably provided that the reinforcing element 20 is attached directly to the housing cover, in particular such that the reinforcing element 20 is attached to the housing cover (housing part 15) completely bypassing the lower part of the housing (housing part 16). Fig. Figure 7 shows a schematic bottom view of the storage housing 12. Fig. Figure 8 shows a partial schematic sectional view of the energy storage device 10 along a section plane AA. It looks particularly good from Fig. Figure 8 shows the reinforcing element 20 with the bulkhead area 26. Preferably, the reinforcing element 20 is attached to the housing part 15, in particular directly, such that the reinforcing element 20 is welded to the housing part 15, in particular directly. In particular, the reinforcing element 20 is welded to the housing part 15 by forming several weld connections, in particular directly, wherein, for example, each weld connection is a spot weld. Thus, for example, the reinforcing element 20 is spot welded to the housing part 15, in particular directly, and thereby attached to the housing part 15. The weld connections are in Fig. 8 illustrated by double arrows.

[0037] By attaching the reinforcing element 20 to the housing part 15, particularly directly and preferably bypassing the housing part 16 entirely, the housing part 15 and the reinforcing element 20, which is connected separately from the housing part 15 and, in particular, directly via the housing part 15, form a unit 40, which is also referred to as the scope of delivery. The described weld connections and the bulkhead area 26 give the unit 40 an advantageously high stiffness against deformation, especially when, for example, a high internal pressure occurs in the receiving chamber 14 due to a thermal event. Reference symbol list 10 electrical energy storage devices 12 storage enclosures 14 Recording room 15 Housing part 16 Housing part 18a-d memory module 20 Reinforcing element 22 Inside 24 amplification area 26 Partition wall area 28 first passage opening 30 second passage opening 32 Connecting element 34 Inside 36 bulkhead 38 bulkhead 40 building units TB sub-area QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 10 2010 043 899 A1

[0002] DE 10 2016 110 330 A1

[0002]

Claims

[1] 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 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, characterized by 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 lower part of the housing, which is arranged between at least two of the memory cells. [2] Electrical energy storage device (10) according to claim 1, characterized by , that: - the housing cover has a first through-opening (28) formed in the sub-area (TB) of the housing cover, which is completely surrounded by the sub-area (TB) along its circumferential direction; and - in the reinforcement area (24) a second passage opening (30) is formed in overlap with the first passage opening (28), which is completely surrounded by the reinforcement area (24) along its circumferential direction. [3] Electrical energy storage device (10) according to claim 2, characterized by , that a connecting element (32) provided on the lower part of the housing, by means of which the housing parts (15, 16) are connected to each other and / or the electrical energy storage device (10) can be attached to a body of the motor vehicle, passes through the through openings (28, 30). [4] Electrical energy storage device (10) according to claim 3, characterized by, that the connecting element (32) is designed as a screw element which has a first thread. [5] Electrical energy storage device (10) according to claim 4, characterized by , that the first thread is directly screwed to a second thread of a further connecting element located on an outer side (35) of the storage housing (12) facing away from the receiving space (14). [6] Electrical energy storage device (10) according to any one of the preceding claims, characterized by , that the bulkhead area (26) has two spaced-apart bulkheads (36, 38) which are arranged between the storage cells. [7] Electrical energy storage device (10) according to any one of the preceding claims, characterized by , that the reinforcement area (24) and the bulkhead area (26) are formed as a single unit. [8] Electrical energy storage device (10) according to any one of the preceding claims, characterized by, that the reinforcement area (24) lies directly and over a flat area against the sub-area (TB) of the housing cover. [9] Electrical energy storage device (10) according to any one of the preceding claims, characterized by , that the reinforcing element (20) is attached directly to the housing cover. [10] Motor vehicle, with an electrical energy storage device (10) according to one of the preceding claims.

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