Electrical energy store for motor vehicle, in particular for motor vehicle, and motor vehicle

Abstract

The invention relates to an electrical energy store (1) for a motor vehicle, comprising a store housing (2) which delimits a receiving space (3), the invention relates to a storage housing (1) having a housing lower part (4) as a first housing part, which partially delimits a receiving space (3), and a housing upper part (6) as a second housing part, which partially delimits the receiving space (3), is formed separately from the housing lower part (4) and is at least indirectly connected to the housing lower part (4), the invention relates to an electrical energy store (1) for storing electrical energy, comprising a storage cell (8), which is designed separately from the storage housing (2) and is arranged in the receiving space (3) between the housing parts, for storing electrical energy, according to the invention, at least one connecting element (10) is provided, which is separate from the storage housing (2) and from the storage cells (8), is directly connected to the housing parts, is arranged between the storage cells (8) and is at least partially arranged in the receiving space (3), and by means of which the forces (F1, F2) can be transmitted between the housing parts.

Description

Field of the Invention

[0001] The present invention relates to an electrical energy storage device for a motor vehicle, in particular for an automobile, according to the preamble of claim 1. Furthermore, the present invention relates to a motor vehicle, in particular an automobile, which includes at least one such electrical energy storage device. Background Art

[0002] DE 102013207534 B4 discloses a battery housing which has a battery accommodated therein. The battery housing has four plate-shaped side members and two cover plates, which can be interconnected to form a box-shaped housing. A battery housing for a battery or a storage battery or for accommodating a battery or a storage battery is known from DE102012022346 B4. Furthermore, a battery system is disclosed in JP 5340676B2. A memory module for a device for powering a motor vehicle, which is constructed from a plurality of energy storage modules, is also known from EP 2569811 B1. Summary of the Invention

[0003] The object of the present invention is to provide an electrical energy storage device for a motor vehicle and a motor vehicle having at least one such electrical energy storage device, such that a particularly high stability of the electrical energy storage device can be achieved in a particularly simple manner.

[0004] According to the present invention, this object is solved by an electrical energy storage device having the features of claim 1 and by a motor vehicle having the features of claim 10. Advantageous embodiments of the present invention are the technical solutions of the dependent claims.

[0005] A first aspect of the present invention relates to an electrical energy storage device (also simply referred to as an energy storage device) for a motor vehicle (also simply referred to as a vehicle). This means that a motor vehicle, preferably constructed as an automobile, especially a car, has an electrical energy storage device in its fully manufactured state. The electrical energy storage device is preferably a battery, especially a secondary battery, and is therefore also referred to as a battery or secondary battery. Electrical energy can be stored electrochemically, in particular, by means of the electrical energy storage device. Preferably, the electrical energy storage device is a high-voltage component, the voltage of which, especially the operating voltage or rated voltage, is preferably greater than 50 volts, especially greater than 60 volts and particularly preferably several hundred volts. Preferably, the motor vehicle has at least one electric motor in its fully manufactured state, by means of which the motor vehicle can be driven, especially purely electrically. The electric motor can be supplied with electrical energy stored by means of the electrical energy storage device. By supplying the electric motor with electrical energy stored by means of the energy storage device, the electric motor can operate in engine mode and can therefore operate as an electric motor. By means of the electric motor, the motor vehicle can be driven, especially purely electrically. Particularly preferably, the electric motor is a high-voltage component, the voltage of which, especially the operating voltage or rated voltage, is preferably greater than 50 volts, especially greater than 60 volts and particularly preferably several hundred volts. Therefore, particularly preferably, the motor vehicle is constructed as an electric vehicle, especially a battery electric vehicle (BEV). It is also conceivable that the motor vehicle is constructed as a hybrid vehicle.

[0006] The electrical energy storage device has a storage housing (also referred to as a battery housing), which in particular directly delimits the accommodation space. The storage housing has a lower housing part that at least partly and preferably directly delimits the accommodation space. The lower housing part is also referred to as the first housing part or is the first housing part of the storage housing. The storage housing also has an upper housing part that at least partly and preferably directly delimits the accommodation space. The upper housing part is the second housing element and is also referred to as the second housing part of the storage housing. The upper housing part is constructed separately from the lower housing part and is connected to the lower housing part at least indirectly, in particular directly. In particular, it is stipulated that in the installation position of the energy storage device (where the energy storage device occupies its installation position in the fully manufactured state of the motor vehicle having the energy storage device), the respective housing parts are arranged successively along the vehicle height direction of the motor vehicle (also simply referred to as the vehicle), i.e., in particular, such that the upper housing part is arranged above the lower housing part along the vehicle height direction of the motor vehicle, i.e., above the lower housing part. In other words, it is preferably stipulated that in the installation position of the energy storage device, the upper housing part is connected upward to the lower housing part along the vehicle height direction of the motor vehicle. Conversely, in the installation position of the energy storage device, the lower housing part is connected downward to the upper housing part along the vehicle height direction. Therefore, in particular, it is stipulated that in the installation position of the energy storage device, the accommodation space is at least partly, in particular at least mostly and thus at least more than half or completely delimited by the upper housing part along the vehicle height direction of the motor vehicle, and in the installation position of the energy storage device, the accommodation space is at least partly, in particular at least mostly and thus at least more than half and completely delimited by the lower housing part along the vehicle height direction of the motor vehicle. For example, it is stipulated that in the installation position of the energy storage device, the accommodation space is not delimited downward by the upper housing part along the vehicle height direction, and for example, it is stipulated that in the installation position of the energy storage device, the accommodation space is not delimited upward by the lower housing part along the vehicle height direction. In particular, the motor vehicle in its fully manufactured state has an interior space (also referred to as a passenger compartment or passenger cabin), which is preferably formed by the vehicle body of the motor vehicle. The vehicle body is preferably constructed as a self-supporting body. Here, in particular, it is stipulated that in the installation position of the electrical energy storage device and thus in the fully manufactured state of the motor vehicle, the interior space is connected upward to the storage housing and thus to the accommodation space (also referred to as the accommodation area) along the vehicle height direction of the motor vehicle, so that in particular the accommodation space is at least partly, in particular at least mostly or completely delimited by the upper housing part along the vehicle height direction upward and thus towards the interior space. Here, in particular, it is stipulated that the accommodation cavity is not delimited upward by the lower housing part along the vehicle height direction and towards the interior space.

[0007] Preferably, the lower part of the housing is constructed separately from the vehicle body and is fixed to the vehicle body at least indirectly. In addition, it is preferably provided that the upper part of the housing is constructed separately from the vehicle body and is fixed to the vehicle body at least indirectly, in particular directly. For example, the upper part of the housing is connected to the seat crossmember of the vehicle body at least indirectly, in particular directly, and is thus fixed to the seat crossmember. Therefore, the memory housing can be constructed separately from the vehicle body and fixed to the vehicle body at least indirectly, in particular directly, for example in such a way that the memory housing is connected to the seat crossmember at least indirectly, in particular directly, i.e., fixed to the seat crossmember.

[0008] In addition, the electrical energy storage device has a plurality of memory cells that are constructed separately from the memory housing and thus separately from both the upper part of the housing and the lower part of the housing. These memory cells are also simply referred to as cells. Preferably, the memory cells are constructed separately from each other and are thus individual cells that are constructed separately from each other. Electrical energy can be stored or stored electrochemically in particular in the memory cells. These memory cells are arranged between the housing components in the accommodation space, and in other words, the accommodation space is arranged between the housing components in the vehicle height direction, in particular in the installation position of the electrical energy storage device, such that in particular the memory cells are arranged between the housing components in the vehicle height direction, in particular in the installation position of the electrical energy storage device. It is particularly preferred that the memory cells are completely arranged in the accommodation space, such that in particular these memory cells are completely arranged between the housing components in the vehicle height direction, in particular in the installation position of the electrical energy storage device.

[0009] Now, in order to achieve a particularly high stability of the electrical energy storage device in a particularly simple manner, that is, especially space-saving and cost-saving, according to the present invention, it is proposed that the electrical energy storage device includes at least one connection element that is separated from the memory housing and thus from the housing components and from the memory cells, and the connection element is at least partially, especially at least mostly and thus at least more than half, arranged in the accommodation space. Here, the connection element is arranged between the memory cells in the accommodation space. Particularly preferably, the connection element is arranged outside the memory cells. For example, the memory cells are arranged successively along a particularly straight line and thus along a straight extending arrangement direction. Preferably, it is stipulated that the connection element is arranged between the memory cells in the accommodation space along the arrangement direction. The connection element is directly connected to each housing component respectively, that is, directly connected to each housing component respectively. In other words, the connection element is directly connected not only to the lower housing component but also to the upper housing component, so that the connection element is directly connected not only to the lower housing component but also to the upper housing component. Thus, forces can be transmitted between the respective housing components through the connection element, especially bypassing the memory cells. The feature "forces can be transmitted between the respective housing components through the connection element" can be understood as that forces and / or torques, that is, loads, can be transmitted between the respective housing components through the connection element, especially bypassing the memory cells. This means that at least one load path can be formed through the connection element, and forces and thus loads can be transmitted between the respective housing components through this load path, and this load path bypasses the memory cells, that is, extends from one of the respective housing components through the connection element to another housing component and bypasses the memory cells here, that is, does not pass through the memory cells. Therefore, forces or loads can be transmitted between the respective housing components through the connection element, and the forces or loads do not pass through the memory cells. Thereby, the memory cells can be protected from overloading. For example, when a force or load acts on one of the respective housing components, the above-mentioned forces that can be transmitted between the respective housing components through the connection element can be generated. The force or load can be transmitted from the said one housing component to the connection element or through the connection element to another housing element, and the force or load does not pass through the memory cells. The connection element is or thus serves as an additional force connector, which is arranged between the cells, that is, in the at least one gap between the cells. The connection element is especially or serves as a support element, because through the connection element, the respective housing components support each other bypassing the memory cells. Particularly advantageous reinforcement and / or damping can be achieved between the cells by means of the connection element, and the connection element can transmit forces acting, for example, from the outside, that is, from the environment of the memory housing and / or from the inside, that is, for example, from the accommodation space, between the respective housing components. Forces can especially be introduced or conducted into the vehicle body and thus into the vehicle structure of the motor vehicle through the connection element, so that, for example, overloading and / or excessive deformation of the energy storage device can be avoided.

[0010] The background of the present invention is, in particular, to design and manufacture an electrical energy storage as a new or novel high-voltage storage system without making the sub-components of the cells into modules. In other words, it is preferably provided that the cells do not form separate modules or are not combined into separate modules. For example, the cell and the housing part form a sandwich structure (also referred to as a sandwich element), which, for example, has a housing part as a cover element or cover layer and a core layer arranged between the cover layers in the vehicle height direction, in particular at the installation position of the electrical energy storage, the core layer comprising at least the cells. Here, for example, the sandwich structure is a composite body, or the housing parts of the cells form a composite body, and in particular, the problem has been recognized that such a composite body only allows limited joining methods, which only enable limited force transmission between the housing parts, in particular. This can lead to the cells being overloaded in certain load cases, which may result in mechanical failure cases, and if appropriate countermeasures are not taken, these mechanical failure cases may in turn lead to power reduction or thermal events. According to the present invention, there is now provided a connecting element through which the force can be particularly advantageously transmitted between the housing parts, in particular bypassing the cells. By means of the connecting element, the composite body or the sandwich structure can be strengthened and / or reinforced in a space-saving, cost-saving and weight-saving manner, whereby a particularly high stability of the electrical energy storage can be achieved. Thereby, particularly high safety can be ensured.

[0011] Preferably, the connecting element is provided as a first connecting element and at least one second connecting element or a plurality of second connecting elements, wherein the descriptions of the first connecting element above and below can be transferred to the corresponding second connecting elements without any problems and vice versa. Thus, for example, the connecting element forms a connecting structure (also referred to as a support structure or serving as a support structure), which is separate from the cells and separately constructed from the housing parts and is directly connected to the housing parts respectively, and the force or load can be transmitted between the housing parts through the connecting structure, in particular bypassing the cells. It is conceivable here that the connecting elements of the connecting structure are integrally constructed with each other, that is, formed from a single piece, so that, for example, the connecting element is constructed as a monolith or formed from a monolith. A monolith is a one-piece and thus integrally manufactured body, which is not assembled from a plurality of separately constructed and interconnected parts, but the monolith is formed from a single piece and thus integrally manufactured. It is also conceivable that the connecting elements are separately constructed from each other.

[0012] In order to achieve a particularly high stability of the electrical energy storage device in a particularly space - and weight - saving manner, in one embodiment of the present invention, it is stipulated that the electrical energy storage device has a cell contact system that is arranged between one of the housing components, in particular between the upper housing component and the storage cells, is separated from the storage housing, from the storage cells, and from the connection elements, and the storage cells are electrically connected to each other through this cell contact system. For this purpose, for example, the cell contact connection system is electrically connected directly to the storage cells, that is, in electrical contact. Here, it is stipulated that the connection element is directly connected to the one housing component, in particular to the upper housing component, bypassing the cell contact system. In other words, the connection element is not connected to the one housing component directly through or only through the cell contact system, but the connection element bypasses the cell contact system, so that the connection element is directly connected to the one housing component, in particular to the upper housing component, bypassing the cell contact system, that is, directly connected to the one housing component. Therefore, force can be transmitted from the connection element to the one housing component, for example, without flowing to the one housing component through the cell contact system.

[0013] Preferably, the cell contact system is arranged between the storage cells and the upper housing component in the vehicle height direction in the installation position of the electrical energy storage device and is thus in particular arranged between the storage cells and the interior space.

[0014] The storage cells, for example, have a corresponding upper side that faces upward in the vehicle height direction in the installation position of the electrical energy storage device and thus faces the interior space. In addition, for example, the storage cells have a corresponding lower side that is particularly opposite to the corresponding upper side such that the lower side faces downward in the vehicle height direction in the installation position of the electrical energy storage device and thus is particularly opposite to the interior space. Therefore, for example, it is stipulated that the cell contact system is arranged between the corresponding upper side and the upper housing component, that is, on the corresponding upper side.

[0015] Another embodiment is characterized in that an electrical energy storage intermediate structure, which is separate from the memory cell, separate from the connecting element, and separately configured from the cell contact system, is provided between another housing component, in particular the lower housing component, and the memory cell. In particular, the intermediate structure is arranged in the installation position of the electrical energy storage between the memory cell and the lower housing component in the vehicle height direction of the motor vehicle and is thus in particular arranged between the lower housing component and the interior space. For example, the intermediate structure is arranged on the corresponding lower side. In particular, it is conceivable that the intermediate structure is arranged in the installation position of the electrical energy storage in the vehicle height direction between the corresponding lower side and the lower housing component. The intermediate structure can achieve at least one advantageous function, which for example includes intrusion prevention and / or degassing. For the purpose of achieving particularly high stability, it is provided that the connecting element is directly connected to the said another housing component, in particular the lower housing component, bypassing the intermediate structure, that is, directly connected to the said another housing component. This means that the connecting element is not connected to the said another housing component through or only through the intermediate structure, but the connecting element bypasses the intermediate structure and is directly connected to the said another housing component, in particular the lower housing component, bypassing the intermediate structure, that is, directly connected to the said another housing component, so that force or load can be transferred from the connecting element to the said another housing component bypassing the intermediate structure.

[0016] It has proven particularly advantageous that the intermediate structure is made of plastic. Thereby, for example, the particularly advantageous deformability and / or energy absorption capacity of the intermediate structure can be achieved in a particularly weight-saving manner, so that the memory cell can be advantageously protected from overload. If, for example, such a force action occurs on the energy storage that in particular an external force acts on the lower housing component from bottom to top in the vehicle height direction and thus acts on the memory housing, the lower housing component can deform elastically or plastically at least in some areas by this force and deform in the direction of the memory cell here. Here, for example, it can lead to plastic or elastic deformation of the intermediate structure, in particular in the direction of the memory cell. Here, the memory cell can be protected from overload by means of the intermediate structure. For example, when the motor vehicle is driving along a lane and passes an object on the road in such a way that the object collides with the lower housing component, such a force that acts on the memory housing from bottom to top in the vehicle height direction can be generated. In particular, the memory cell can be protected from overload by means of the intermediate structure here. Therefore, the intermediate structure can be used, for example, as an intrusion prevention device.

[0017] Another embodiment is characterized in that the intermediate structure has at least one gas channel, which can be flowed through by a gas flowing out of the at least one memory cell and especially a hot gas in the case of a thermal event occurring in the at least one memory cell in the memory module. The gas can be led away from the memory cell through the gas channel. For example, a thermal event can occur based on a short circuit of the at least one memory cell. In particular, a force load on the energy storage caused by an accident can lead to a thermal event, such as a short circuit caused by a force load caused by an accident. During a thermal event, the aforementioned and for example hot gas can be generated in the at least one memory cell. For example, the corresponding memory cell has at least one or exactly one predetermined fracture site, which is also referred to as a predetermined failure location. If, for example, a thermal event occurs at the corresponding memory cell such that the aforementioned, especially hot gas is generated in the corresponding memory cell, a pressure increase occurs in the corresponding memory cell. To prevent the corresponding memory cell from exploding uncontrollably, the memory cell, especially the corresponding cell housing of the corresponding memory cell, is made to fail purposefully and first at the corresponding predetermined fracture site, thereby forming an opening at the corresponding predetermined fracture site. The gas can flow out of the corresponding memory cell via the opening, and the gas can, for example, flow into the gas channel and be purposefully led away or removed from the memory cell by means of the gas channel. Thereby, for example, a thermal event that first occurs in one memory cell can be prevented from spreading to other memory cells, and thus heat propagation can be avoided. Leading away or removing the gas from the memory cell by means of the gas channel is also referred to as degassing or exhausting, so that the intermediate structure can particularly advantageously, especially particularly weight-, space- and / or cost-savingly, fulfill the degassing function. Thereby, particularly high stability and safety can be ensured.

[0018] In another particularly advantageous embodiment of the invention, the connecting element is made of at least one or exactly one fiber-reinforced plastic. The fiber-reinforced plastic can, for example, include carbon fiber-reinforced plastic (CFK) and / or glass fiber-reinforced plastic (GFK). Thereby, particularly high rigidity can be achieved in a particularly weight-saving manner. Alternatively or additionally, the connecting element is, for example, made of a metallic material, especially made of steel. Thereby, a particularly high stiffness of the memory housing or the electrical energy storage can be achieved in a particularly cost-saving manner overall.

[0019] In order to enable forces to be transmitted particularly advantageously between the housing components, in another design of the invention it is provided that the connecting element is integrally constructed. In other words, it is preferably provided that the connecting element is formed by a single piece. Thus, preferably, the connecting element is not composed of a plurality of separately constructed and interconnected components, but preferably the connecting element is constructed as a monolith or formed by a monolith, which is formed by a single piece and is thus manufactured integrally.

[0020] In order to be able to transmit forces particularly advantageously via the connecting element, in a further design of the present invention it is provided that the connecting element is configured in a toothed or wavy shape at least in one length region. In particular, it is provided that the connecting element is configured in a toothed or wavy shape at least in one length region when viewed in a plane that extends perpendicular to the vehicle height direction of the motor vehicle at the installation position of the electrical energy storage. Thereby, particularly high stability can be achieved.

[0021] Finally, it has proven particularly advantageous that the connecting element is directly connected to the corresponding housing part in a material-locking manner. Thereby, for example, the connecting element is directly adhesively bonded and / or welded to the corresponding housing part. Welding can be achieved, for example, by spot welding, laser beam welding, and electron beam welding. Alternatively or additionally, the connecting element is directly connected to the corresponding housing part in a force-locking and / or form-locking manner and thereby directly connected to the corresponding housing part, whereby forces can be transmitted particularly advantageously.

[0022] The second aspect of the present invention relates to a motor vehicle, also simply referred to as a vehicle and preferably configured as an automobile, in particular a sedan, which has at least one electrical energy storage according to the first aspect of the present invention. The advantages and advantageous designs of the first aspect of the present invention can be regarded as the advantages and advantageous designs of the second aspect of the present invention, and vice versa. Description of the Drawings

[0023] Other details of the present invention result from the following description of the preferred embodiments together with the drawings. The drawings are as follows:

[0024] Figure 1 Showing a schematic sectional side view of an electrical energy storage for a motor vehicle;

[0025] Figure 2 Partially showing another schematic sectional side view of the electrical energy storage in a first load case;

[0026] Figure 3 Partially showing another schematic sectional side view of the energy storage in a second load case;

[0027] Figure 4 Partially showing a schematic sectional top view of the electrical energy storage according to the first embodiment;

[0028] Figure 5 Partially showing a schematic sectional top view of the energy storage according to the second embodiment; and

[0029] Figure 6 Partially showing a schematic sectional top view of a third embodiment of the electrical energy storage. Detailed Description of the Invention

[0030] In the figures, identical or functionally identical elements are provided with the same reference signs.

[0031] Figure 1 A schematic cross-sectional side view shows an electrical energy storage device 1 (also simply referred to as an energy storage device or storage) for a motor vehicle (also simply referred to as a vehicle), which motor vehicle is preferably configured as an automobile, in particular a sedan. The electrical energy storage device 1 has a storage housing 2, which in particular directly delimits a receiving space 3 (also referred to as a receiving area). The storage housing 2 has a lower housing part 4, which is also referred to as the first housing part. The lower housing part 4 delimits the receiving space 3 in such a way that the receiving space 3 in the installed position of the electrical energy storage device 1 is at least partially, in particular at least mostly or completely, delimited by the lower housing part 4 in the vehicle height direction of the motor vehicle downwards. Figure 1 The installed position of the electrical energy storage device 1 is shown, which electrical energy storage device occupies its installed position in the fully manufactured state of the motor vehicle having the electrical energy storage device 1. Here, the vehicle height direction is indicated by a two-way arrow 5. In addition, the storage housing 2 has an upper housing part 6, which is also referred to as the second housing part. The upper housing part 6 delimits the receiving space 3 in such a way that the receiving space 3 is at least partially, in particular at least mostly and thus more than half or completely, delimited by the upper housing part 6 in the vehicle height direction of the motor vehicle upwards.

[0032] In addition, the motor vehicle also has a vehicle body, which is not visible in the figures and is preferably configured as a self-supporting body, and which forms the interior space (also referred to as the passenger compartment or passenger cabin) of the motor vehicle. Here, during the driving of the motor vehicle, persons, such as the driver of the motor vehicle, can stay in the interior space. In particular, at least one seat device, such as a single seat or a bench seat, which provides at least one seat or a plurality of seats, is provided in the interior space. Here, the corresponding persons can in particular sit on the seats and thus on the seat device during driving. The interior space is connected upwards in the vehicle height direction to the housing part and thus in the present case to the receiving space 3 in such a way that the upper housing part 6 is arranged between the receiving space 3 and the interior space in the vehicle height direction (two-way arrow 5). In addition, it can be Figure 1 seen that the upper housing part 6 is connected upwards in the vehicle height direction to the lower housing part 4, such that the respective housing parts are arranged successively, i.e., one above the other, in the vehicle height direction.

[0033] The respective housing parts are configured separately from one another and are connected to one another, for example, by corresponding joining flanges 7.

[0034] The electrical energy storage device 1 has a plurality of memory cells 8 that are separated from one another and are separately configured from the memory housing 2, in or by means of which electrical energy can be stored or is stored, in particular electrochemically. From Figure 1 It can be seen that the memory cells 8 (also simply referred to as cells) are in particular completely arranged in the accommodation space 3 and thus in the memory housing 2.

[0035] Now, in order to be able to achieve a particularly high stability of the energy storage device 1 in a particularly space - and weight - saving manner, the energy storage device 1 has a connection structure 9 (also referred to as a support structure or serving as a support structure) that is separate from the memory housing 2 and is separately configured from the memory cells 8, and the connection structure is directly connected to the respective housing components. The connection structure 9 is arranged in the accommodation space 3 at least in part such that the connection structure 9 is arranged between the memory cells 8. Thereby, forces, i.e., loads, can be transmitted between the respective housing components through the connection structure 9.

[0036] From Figure 1 It can be seen that the connection structure 9 can have a plurality of connection elements 10 that are separate from the memory housing 2 and are separately configured from the memory cells 8, and these connection elements are directly connected to the respective housing components. The respective connection elements 10 are arranged in the accommodation space 3 at least in part such that the respective connection elements 10 are arranged between the respective memory cells 8. Forces can be transmitted between the respective housing components through the respective connection elements 10.

[0037] In Figures 1 to 3 the embodiment shown, the upper housing part 6 has coupling elements 11, and the upper housing part 6 and thus the memory housing 2 are integrally connected to the vehicle body, in particular to a seat cross - member of the vehicle body, and are thus fixed to the vehicle body by means of these coupling elements. Here, for example, the aforementioned seat device is connected to at least one seat cross - member, i.e., fixed to one of the seat cross - members.

[0038] In Figures 1 to 3 the embodiment shown, a cell contact system 12 is arranged in the accommodation space 3 between the upper housing part 6 and the memory cells 8 in the vehicle height direction. The cell contact system is separately configured from the memory housing 2, from the connection structure 9, and from the memory cells 8. The memory cells 8 are electrically connected to one another by means of the cell contact system 12. For this purpose, for example, the cell contact system 12 is electrically connected to the memory cells 8. Here, the connection structure 9 is directly connected to the upper housing part 6 while bypassing the cell contact system 12.

[0039] Furthermore, in Figures 1 to 3In the embodiment shown, it is stipulated that an intermediate structure 13 is provided between the lower housing part 4 and the memory cell 8 in the vehicle height direction, which is separate from the memory housing 2, separate from the memory cell 8, separate from the connection structure 9, and separate from the cell contact connection system 12. The intermediate structure is currently configured as or serves as an absorption structure, i.e., an absorption element, especially an energy absorption element. Here, the connection structure 9 and thus each connection element 10 are directly connected to the lower housing part 4 while bypassing the intermediate structure 13. The intermediate structure 13 is preferably made of plastic. The plastic can be a foam material, i.e., plastic foam, so that preferably the intermediate structure 13 is configured as a foam element. It is also conceivable that the intermediate structure 13 is configured as a plastic injection molding. The intermediate structure 13 is especially configured as a solid. Alternatively or additionally, the intermediate structure can have at least one gas channel, which can be flowed through by the gas flowing out of the at least one memory cell during a thermal event in the at least one memory cell. The gas channel is, for example, completely circumferentially surrounded and directly defined by the intermediate structure 13 along its circumferential direction. The gas can be directed away from the memory cell 8 through the gas channel.

[0040] In Figure 2 a first load case is shown, in which an intrusion into the accommodation space 3 can occur. In the first load case, for example, an object 22 arranged in the environment 14 of the energy storage 1 collides with the lower housing part 4 such that a force F1 acts on the lower housing part 4 from bottom to top in the vehicle height direction. As a result, for example, at least one partial region of the lower housing part 4 undergoes plastic or elastic deformation and thus, for example, at least one partial region of the intermediate structure 13 undergoes elastic or plastic deformation. However, since the connection structure 9 is directly connected to the respective housing parts, the force F1 can be particularly advantageously transmitted from the lower housing part 4 to the upper housing part 6 through the connection structure 9, so that the intrusion and thus the corresponding deformation can be kept particularly small. Thus, the memory cell 8 can be protected from excessive loading.

[0041] In Figure 3 a second load case is shown, in which, for example, a flexure of the energy storage 1 shown by the dashed line in Figure 3 occurs, which is especially based on the self-weight of the energy storage 1. This flexure of the energy storage 1 caused by the self-weight is represented by a force F2 in Figure 3 , and the force, for example, is, represents, or includes the gravity generated by the self-weight of the energy storage 1. Since now the connection structure 9 is directly connected to the respective housing parts, the flexure can be kept particularly small.

[0042] Figure 4 A first embodiment of the energy storage 1 is shown locally in a schematic top view (especially observed in a section extending perpendicular to the vehicle height direction). ByFigure 4 It can be seen that the energy storage device 1 can have a cooling device 15 arranged in the accommodation space 3, and the cooling device can be flowed through by a preferably liquid coolant for cooling the memory cells 8. It can also be seen that the first memory cells 8 are arranged successively along the arrangement direction represented by the double-headed arrow 16 and thus form a first cell row Z1. The second memory cells 8 are arranged successively along the arrangement direction and thus form a second cell row Z2, and the second cell row follows the cell row Z1 along the following direction represented by the double-headed arrow 17. The following direction extends perpendicular to the arrangement direction, and the following direction and the arrangement direction extend in a common plane perpendicular to the vehicle height direction. Therefore, the vehicle height direction extends perpendicular to the arrangement direction and perpendicular to the following direction. It can be seen that the cell rows Z1 and Z2 are arranged offset from each other along the arrangement direction. The third memory cells 8 are arranged successively along the arrangement direction and form a third cell row Z3, and the third cell row is arranged beside the cell row Z2 and beside the cell row Z1 along the following direction, that is, follows the cell rows Z1 and Z2 along the following direction. The cell rows Z1 and Z3 are arranged at the same height along the arrangement direction. In addition, the fourth memory cells 8 are arranged successively along the arrangement direction and form a fourth cell row Z4, and the fourth cell row follows the cell rows Z1, Z2, and Z3 along the following direction. Here, the cell row Z4 is arranged offset from the cell rows Z1 and Z3 along the arrangement direction, and the cell rows Z2 and Z4 are arranged at the same height along the arrangement direction.

[0043] The cooling device 15 includes at least two cooling elements 18 and 19 that can be flowed through by the coolant, and the cooling elements especially extend along the arrangement direction. The cell rows Z1 and Z2 form a first pair of cell rows, and the cell rows Z3 and Z4 form a second pair of cell rows. The cooling element 19 is a cooling element shared by each of the pairs of cell rows, so that the cooling element 19 is arranged between the cell rows Z2 and Z3 along the following direction and thus between the pairs of cell rows. No cooling element that can be flowed through by the coolant is arranged between the cell rows Z1 and Z2 and between the cell rows Z3 and Z4.

[0044] By Figure 4 It can be seen that, for example, at least one first connecting element 10 denoted by V1 can be configured as a sleeve (also called a cell sleeve), and the sleeve surrounds one of the memory cells 8 along the circumferential direction of a memory cell 8. The circumferential direction of the memory cell 8 extends, for example, in the plane in which the above-mentioned arrangement direction and following direction extend.

[0045] Alternatively or additionally, for example, a second connecting element 10 denoted by V2 can be configured as a cell simulation member, and the memory cells 8 are arranged outside the connecting element V2. In Figure 4In the first embodiment shown in [description], the corresponding memory cells are configured cylindrically on the outer peripheral side and are thus configured as corresponding circular cells. For example, the cell mock-up has the same shape as the corresponding memory cell 8 on the outer peripheral side. For example, the connecting element V1 is configured as a hollow cylinder such that the connecting element V1 is configured cylindrically on both the inner and outer peripheral sides. Thereby, the one memory cell 8 can be arranged particularly space-savingly in the connecting element V1.

[0046] Figure 5 The second embodiment of the energy storage 1 is shown locally in a schematic top view (especially as viewed in the section). In Figure 4 the first embodiment shown in [description], only unilateral cooling of the corresponding cell rows Z1 - Z4 is provided when viewed along the follow-up direction, while in Figure 5 the second embodiment shown in [description], bilateral cooling is provided for at least the cell rows Z1 - Z3 when viewed along the arrangement direction. Here, the cooling device 15 includes cooling elements 18, 19, 20, and 21, and the corresponding cooling elements 19, 20, 21 are arranged between the corresponding cell rows Z1 - Z4 when viewed along the follow-up direction. In particular, it is conceivable that the corresponding cooling elements 18, 19, 20, 21 contact the corresponding memory cells 8 on the outer peripheral side, in any case as long as the corresponding memory cells 8 are not surrounded by the connecting element V1.

[0047] Finally, Figure 6 The third embodiment of the energy storage 1 is shown locally in a schematic sectional top view (especially as viewed in the section). It can be seen that at least one third connecting element 10 denoted by V3 in Figure 6 [description] can be configured in a zigzag or wavy shape in at least one length region L. For example, the connecting element V3 extends between the cooling elements 18 and 19 along the follow-up direction and, for example, extends from the cooling element 18 towards the cooling element 19 and vice versa. Alternatively or additionally, at least one fourth connecting element 10 denoted by V4 in Figure 6 [description] can be configured in a zigzag or wavy shape in at least one length region L, and the connecting element V4 extends along the arrangement direction (double-headed arrow 16).

[0048] The corresponding connecting element 10 is arranged, for example, partly and in particular in one of the housing parts in such a way that the corresponding connecting element 10 is arranged in a corresponding recess, for example configured as a through-hole, of the one housing part. In particular, it can be provided here that the corresponding connecting element 10 is directly connected to the one housing part in the corresponding recess and is thus directly connected to the other housing part. For example, in a method for manufacturing an electrical energy storage device 1, it is provided as follows: in a state in which the housing parts are separate from one another and spaced apart from one another, the connecting element 10 is arranged on one of the housing parts and in particular in the one housing part, for example the connecting element 10 is directly connected to the one housing part and is thus directly connected to the other housing part. In particular, it is provided that in this state the memory cell 8 is located outside the one housing part. After the connecting element 10 has been arranged on the one housing part, in particular in the one housing part, and directly connected to the one housing part, the memory cell 8 is arranged on the one housing part, in particular in the one housing part. Here, for example, the connecting element 10 that has already been arranged on the one housing part and is directly connected to the one housing part serves as a positioning aid by means of which the memory cell 8 is positioned, i.e. oriented, relative to the one housing part. Then, for example, the other housing part is connected to the one housing part, for example the other housing part is slipped onto the one housing part. Here, for example, the corresponding connecting element 10 is assigned to the corresponding, previously mentioned recess of the other housing part, which is for example configured as a through-hole, such that when the other housing part is connected to the one housing part, the connecting elements are arranged in the recesses of the other housing part. Here, for example, the connecting element 10 passes through the recess, which is in particular configured as a through-hole, of the other housing part in such a way that the connecting element 10 projects from the other housing part on the side facing away from the one housing part, in particular the upper side, of the other housing part. Then, in particular on the side of the other housing part, at least one corresponding partial region of the corresponding connecting element 10 is shaped, in particular bent. For example, the shaped, in particular bent, corresponding partial region of the corresponding connecting element 10 is directly connected to the other housing part, such that the corresponding connecting element 10 is directly connected to the other housing part. Then, for example, the corresponding recesses are sealed by means of a sealing element, for example made of plastic, in particular PVC. The direct connection of the corresponding connecting element 10 to the corresponding housing part can be effected, for example, in a material-locking manner and thus by means of an adhesive and / or by welding and in a positive-locking and / or form-fitting manner.

[0049] List of reference numerals

[0050] 1 Electrical energy storage device

[0051] 2 Memory housing

[0052] 3 Accommodating space

[0053] 4 Lower housing component

[0054] 5 Double-headed arrow

[0055] 6 Upper housing component

[0056] 7 Joining flange

[0057] 8 Memory unit

[0058] 9 Connection structure

[0059] 10 Connection element

[0060] 11 Coupling element

[0061] 12 Unit contact system

[0062] 13 Intermediate structure

[0063] 14 Environment

[0064] 15 Cooling device

[0065] 16 Double-headed arrow

[0066] 17 Double-headed arrow

[0067] 18 Cooling element

[0068] 19 Cooling element

[0069] 20 Cooling element

[0070] 21 Cooling element

[0071] 22 Object

[0072] F1 First force

[0073] F2 Second force

[0074] V1 First connection element

[0075] V2 Second connection element

[0076] V3 Third connection element

[0077] V4 Fourth connection element

[0078] Z1 First unit row

[0079] Z2 Second unit row

[0080] Z3 Third unit row

[0081] Z4 fourth monomer row

Claims

1. An electrical energy storage device (1) for a motor vehicle, comprising a storage device housing (2) which defines a storage space (3), the storage device housing having as a first housing part a housing lower part (4) which partially defines the storage space (3) and as a second housing part an housing upper part (6) which partially defines the storage space (3), is constructed separately from the housing lower part (4) and is at least indirectly connected to the housing lower part (4), and the electrical energy storage device comprises a storage cell (8) for storing electrical energy which is constructed separately from the storage device housing (2) and is arranged between the housing parts in the storage space (3), characterized in that At least one connecting element (10) which is separate from the storage housing (2) and constructed separately from the storage cells (8), is directly connected to each of the housing parts, is arranged between the storage cells (8) and is at least partially arranged in the receiving space (3), and forces (F1, F2) can be transmitted between the housing parts through the connecting element.

2. The electrical energy storage device (1) according to claim 1, characterized in that A cell contact system (12) is provided between one of the housing parts and the storage cell (8), which is separate from the storage housing (2), separate from the storage cell (8) and separate from the connecting element (10), and the storage cells (8) are electrically connected to one another via the cell contact system, wherein the connecting element (10) is directly connected to the one housing part while bypassing the cell contact system (12).

3. The electrical energy storage device (1) according to claim 2, characterized in that An intermediate structure (13) is provided between the other housing part and the storage cell (8), which is constructed separately from the storage housing (2), separately from the storage cell (8), separately from the connecting element (10) and separately from the cell contact system (12), wherein the connecting element (10) is directly connected to the other housing part while bypassing the intermediate structure (13).

4. The electrical energy storage device (1) according to claim 3, characterized in that The intermediate structure (13) is made of plastic.

5. The electrical energy storage device (1) according to claim 3, characterized in that The intermediate structure (13) has at least one gas channel through which gas flowing out of at least one of the storage cells (8) can flow when a thermal event occurs in at least one of the storage cells (8), and through which the gas can be conducted away from the storage cell (8).

6. The electrical energy storage device (1) according to claim 1, characterized in that The connecting element (10) is made of fiber-reinforced plastic and / or of metal material.

7. The electrical energy storage device (1) according to claim 1, characterized in that The connecting element (10) is designed in one piece.

8. The electrical energy storage device (1) according to claim 1, characterized in that The connecting element (10) is designed to be zigzag or wavy at least in a length region (L).

9. The electrical energy storage device (1) according to claim 1, characterized in that The connecting element (10) is directly connected to the corresponding housing part in a material-locking and / or force-locking and / or form-locking manner.

10. A motor vehicle comprising at least one electrical energy storage device (1) according to any one of the preceding claims.

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