Energy storage floor device for a motor vehicle, particularly a passenger car, and motor vehicle

Abstract

The invention relates to an energy store floor arrangement (1) for a motor vehicle, comprising a floor structure (2) with longitudinal and transverse members (3, 4, 6) as support elements connected to one another, an electric energy store (9) arranged on the underside of the floor structure (2) and connected to the floor structure (2), the electric energy store comprising a store housing (10) with an upper housing (11), in which at least one intermediate space (8) between at least two support elements (3, 4, 6) is closed by stacking the upper housing below in the vehicle height direction (34), and prismatic battery cells (14) arranged in the store housing (10). First ones of the battery cells (14, Z1) are arranged in a first stacking direction (15) in a sequential manner so as to form a first cell module (16). Second ones of the prismatic battery cells (14, Z2) are arranged in a second stacking direction (17) in a sequential manner so as to form a second cell module (18). The cell modules (16, 18) are disposed adjacent to each other and joined together. The first battery cell and the second battery cell (Z1, Z2) are joined to the upper housing (11).

Description

[Technical field]

[0001] The present invention relates to an energy store floor arrangement for a motor vehicle, in particular a passenger car, according to the preamble of patent claim 1. Furthermore, the present invention relates to a motor vehicle, in particular a passenger car. [Background technology]

[0002] From Patent Document 1, it can be seen that an energy absorbing and dissipating side impact system for a vehicle is known, which includes a battery pack housing configured to hold a plurality of batteries. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] European Patent Application Publication No. 2468609 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide an energy store floor arrangement for a motor vehicle as well as a motor vehicle equipped with such an energy store floor arrangement, which in particular allows a space-saving assembly and a secure attachment of an electric energy store to the floor structure. [Means for solving the problem]

[0005] This problem is solved according to the invention by an energy store floor device with the features of patent claim 1 and by a motor vehicle with the features of patent claim 10. Advantageous embodiments of the invention are the subject matter of the dependent claims.

[0006] A first aspect of the invention relates to an energy store floor arrangement for motor vehicles, in particular passenger cars. The energy store floor arrangement comprises a floor structure with longitudinal members and transverse members as supporting members connected to one another. This means that the floor structure comprises at least two longitudinal members. The longitudinal members are, for example, side skirts. The longitudinal members are, for example, spaced apart from one another in the transverse direction of the vehicle and extend substantially elongated in the longitudinal direction of the vehicle. In other words, when the energy store floor arrangement, also simply called floor arrangement, is in the mounted state (assembled position), the longitudinal members are, for example, spaced apart from one another in the transverse direction of the vehicle, but the floor arrangement is in its mounted state (assembled position) in the completed state of the motor vehicle equipped with this floor arrangement. Here, each longitudinal member has a respective longitudinal extension direction that extends in the longitudinal direction of the vehicle, i.e. that extends parallel to the longitudinal direction of the vehicle. Furthermore, the floor structure comprises at least one transverse member or a plurality of transverse members. The transverse members have a second longitudinal extension direction which preferably extends perpendicularly to the respective first longitudinal extension direction of the respective longitudinal member. In particular, when the floor structure is in the installed state, the second longitudinal extension direction of the transverse members extends in the transverse direction of the vehicle, i.e. parallel to the transverse direction of the vehicle. In particular, the longitudinal members and the transverse members are connected to each other, for example, such that the transverse members are connected to the longitudinal members, in particular at their both ends, i.e. attached to the longitudinal members, so that, for example, the longitudinal members are connected to each other via the transverse members. In particular, if the floor structure comprises a plurality of, thus at least two, transverse members, it may be considered that the transverse members are spaced apart from one another in the longitudinal direction of the vehicle when the floor arrangement, and thus the floor structure, is in the mounted state. In particular, for example, the floor structure is a frame-type floor structure or a vehicle body structure. The floor structure is, for example, a part of the body of a motor vehicle, also called the body shell, which is preferably formed as a self-supporting vehicle body. This body defines the interior of the motor vehicle, also called the passenger compartment or cabin, in which passengers, such as the driver of the motor vehicle, can reside, in particular while the motor vehicle is traveling. It is therefore very preferably considered that the floor structure is part of the body shell. Here, it may be considered that the body (body shell) and thus the floor structure are manufactured during the manufacture of the body shell, in which case, for example, the body shell is manufactured in the process of manufacturing the energy store floor arrangement or the vehicle body. In particular, it may be considered that the respective longitudinal and / or transverse members are made of a metallic material, in particular made of steel or aluminum. The longitudinal and transverse members are also collectively called support members.

[0007] The energy store floor arrangement further comprises an electric energy store arranged under the floor structure and connected to the floor structure. The feature that the electric energy store is arranged under the floor structure may be understood in particular to mean that when the energy store floor arrangement is in the installed state, the electric energy store is arranged at least partially, in particular at least for the most part, i.e. at least more than half or even entirely, under the floor structure in the vehicle height direction, and thus in particular under the support elements. As will be explained in more detail below, the electric energy is stored or is stored by the electric energy store. The electric energy store comprises a store housing with an upper housing, at least one intermediate space between at least two support elements is closed by overlapping the upper housing downwards in the vehicle height direction. In other words, the support elements are arranged and connected to one another in such a way that an intermediate space, also called intermediate compartment, is formed between the at least two support elements. The at least two support members are, for example, longitudinal members, so that, for example, an intermediate space is arranged between the longitudinal members in the transverse direction of the vehicle, in particular arranged so that the intermediate space is bounded on both sides in the transverse direction of the vehicle by the longitudinal members, again directly in each case. It is also conceivable that the intermediate space is arranged in the longitudinal direction of the vehicle between transverse members spaced apart from one another in the longitudinal direction of the vehicle, again directly in each case, so that the intermediate space is bounded on both sides in the longitudinal direction of the vehicle by the transverse members spaced apart from one another in the longitudinal direction of the vehicle. The upper housing closes the intermediate space downwards in the vehicle height direction by overlapping or covering it, so that the upper housing serves as a floor plate of the floor, and the interior is delimited at least partially, in particular at least in the majority, thus at least half or more or entirely, downwards in the vehicle height direction by this floor or floor plate. Furthermore, for example, the upper housing is formed as a planar member, i.e., as a plate, in at least a portion of the region, and has a substantially two-dimensional extent in at least a portion of the region.In particular, it is provided here that no further floor plate, formed separately from the floor structure and from the upper housing and / or between the intermediate space and the upper housing in the vehicle height direction, is arranged between the support elements separating the intermediate space and the upper housing and / or between the intermediate space and the upper housing. In this energy store floor arrangement, the intermediate space is therefore (no longer) closed by a floor plate of the floor structure or the vehicle floor surface of the vehicle body, formed for example as a floor slat, in comparison with a conventional vehicle body, but by an upper housing of the store housing arranged below the floor structure. This allows the weight of the vehicle to be kept particularly light. For example, the upper housing is formed from a metal material, in particular steel or aluminum, so that for example this upper housing is used as a floor plate formed as a floor slat to close the intermediate space.

[0008] For example, the longitudinal members are arranged in the transverse direction of the vehicle at a first distance extending in the transverse direction of the vehicle from one another. It is also conceivable that the transverse members are arranged in the longitudinal direction of the vehicle at a second distance extending in the longitudinal direction of the vehicle from one another. Here, it is conceivable that the intermediate space extends in the transverse direction of the vehicle over at least half of the first distance, in particular over the entire first distance, or at least over half of the second distance, in particular over the entire second distance, in the longitudinal direction of the vehicle. Here, it is preferred that the intermediate space is overlapped at least to the great extent, and therefore at least half or even entirely, of the upper housing downwards in the height direction and is therefore closed. This allows a particularly weight-saving construction to be realized. It is also conceivable that the intermediate space extends in the transverse direction of the vehicle over at least half of the width of the body extending in the transverse direction of the vehicle.

[0009] The electrical energy store further comprises battery cells for storing electrical energy, in particular electrochemically. Battery cells, also simply called cells or single cells, are individual cells with or in which electrical energy, in particular electrochemically, is stored or stored. Here, the battery cells are arranged in a store housing. The store housing comprises a storage space, which is for example partially, and even directly, bounded by the upper housing. Here, the battery cells are arranged in the store housing, for example, in such a way that the battery cells are surrounded on all sides by the store housing and thus in the storage space. For example, the battery cells are electrically connected to one another, so that a particularly large amount of electrical energy can be stored in the electrical energy store.

[0010] Preferably, the electrical energy store is a high-voltage component, the voltage of which, in particular the operating voltage and / or the nominal voltage, is preferably higher than 50 volts, in particular higher than 60 volts, more preferably several hundred volts. This allows for particularly high powers to be realised, for example for driving a motor vehicle, in particular 100% electrically, configured as a hybrid or electric vehicle. Most preferably, the motor vehicle is configured as a battery electric vehicle (BEV).

[0011] In order to achieve an especially space- and weight-saving, yet especially robust, overall attachment of the energy store to the floor structure and thus an especially high stiffness of the energy store floor arrangement, the battery cells are provided according to the invention as prismatic battery cells with a prismatic outer periphery. A first of the prismatic battery cells is arranged in a first stacking direction so as to form a first cell module or a first cell row. When the floor arrangement is in the installed state, the first stacking direction extends, for example, parallel to the longitudinal direction of the vehicle or parallel to the transverse direction of the vehicle. A second of the prismatic battery cells is arranged in a second stacking direction extending parallel to the first stacking direction so as to form a second cell module or a second cell row. Thus, for example, the second stacking direction extends, when the floor arrangement is in the installed state, parallel to the longitudinal direction of the vehicle or parallel to the transverse direction of the vehicle. The cell modules, also called battery modules, are arranged next to one another in an arrangement direction that runs perpendicular to the stacking direction. The cell modules are furthermore joined, i.e. connected, to one another. As a result, the cell modules form one large cell module block, also simply called block or module block. Furthermore, it is provided according to the invention that the first battery cells and the second battery cells, and thus the cell module block, are joined, in particular directly, to the upper housing. As a result, the module block and the upper housing form a particularly rigid assembly, which, in particular when attached to the floor structure, contributes to a particularly high rigidity of the energy store floor arrangement. In addition, a separate floor plate, for example formed as a floor lamella for closing the intermediate space, is dispensed with or is not provided and can therefore be omitted, so that the number of parts, the required assembly space and the costs of the energy store floor arrangement can be kept particularly low. Furthermore, a storage capacity of the electric energy store can be realized, such that a particularly large amount of electric energy can be stored in the energy store.The invention makes it possible to splice prismatic battery cells into cell modules and to install the modules in the available assembly space without hanging them. As a result of the elimination of intermediate structures, the available assembly space can be advantageously used, in which the energy stores or cells are placed. This allows the external dimensions of the energy stores to be kept small, while still allowing a high storage capacity to be achieved.

[0012] In order to be able to achieve a particularly high rigidity of the above-mentioned assembly and thus of the floor device in a manner that is particularly weight- and assembly-space-saving as a whole, it is provided in one embodiment of the invention that the first battery cells and the second battery cells are in particular glued directly to the upper housing and thereby joined thereto, in other words the module block is in particular glued directly to the upper housing and thereby joined thereto.

[0013] Yet another embodiment is characterized in that each prismatic battery cell comprises a respective cell housing. In particular, each cell housing forms a respective outer shell of each battery cell, which shell can be visually and tactilely perceived by a person in the vicinity of the battery cell. Since each battery cell is prismatic, each cell housing has a prismatic outer circumferential surface. Each cell housing comprises a respective housing bottom. Each battery cell comprises a connection terminal, also called a terminal, arranged on an upper surface of the respective cell housing opposite the respective housing bottom, via which the electrical energy stored in each battery cell can be provided from the respective battery cell. The housing bottom is therefore arranged on a respective lower surface of the respective cell housing. In other words, the housing bottom and the respective connection terminal of each battery cell are arranged on mutually opposing surfaces of the respective cell housing, the respective surfaces being in a position facing each other in the direction of the respective cell housing. A first surface of the surfaces is the upper surface, on which or on which the connection terminal is arranged. The second face is then the lower face, on which or on which the housing bottom, also simply called bottom, is arranged. When the energy store floor device is in the mounted state, for example, the cell housing direction extends parallel to the vehicle height direction. Each cell housing may for example have a respective cell housing chamber, in which, in particular, a liquid electrolyte is placed. It may furthermore be considered that in the cell housing chamber at least two or exactly two electrodes of each battery cell are arranged, which electrodes are for example immersed in or in contact with the electrolyte. One of the first electrodes is for example electrically connected to a first one of the connection terminals, and the second electrode is for example electrically connected to a second connection terminal. It may furthermore be considered that electrical energy provided by an energy source can be charged into each battery cell via the connection terminals, and thus stored in each battery cell.It may be considered here in particular that the respective cell housing chamber is bounded at least partially, in the direction of the cell housing, on one side, at least almost or completely, in particular directly, by the respective housing bottom.

[0014] In order to be able to achieve a particularly high rigidity of the energy store floor arrangement in a particularly space-saving manner, in a further embodiment of the invention, the first battery cells and the second battery cells are connected to the upper housing via their respective housing bottoms, such that, with the energy store floor arrangement in the mounted state, the housing bottoms and thus the lower faces of the battery cells face upwards in the vehicle height direction, and the connection terminals and thus the upper faces of the battery cells face downwards in the vehicle height direction. A particularly high rigidity can be achieved, since the prismatic battery cells can be connected to the upper housing via the housing bottoms with a particularly wide surface and therefore particularly firmly.

[0015] In the method for producing an energy store floor arrangement, first an upper housing is provided. In particular, the upper housing is provided with a lower surface facing vertically upwards. Then, for example, the battery cells are joined, in particular directly, to the upper housing, in particular to the lower surface of the upper housing, in particular via their housing bottoms. In other words, for example, the housing bottoms are joined, in particular directly, to the upper housing, in particular to the lower surface of the upper housing. The upper housing and the battery cells joined thereto thus form the above-mentioned assembly, which, after joining the battery cells to the upper housing, is for example turned over and connected to the floor structure with the lower surface of the upper housing facing away from the support elements. Thus, when the energy store is in the installed state, the lower surface of the upper housing faces down in the vehicle height direction and therefore faces away from the support elements, while the energy store is in its installed state in the completed state of the motor vehicle configured with the energy store floor arrangement. In this way, the energy store floor arrangement can be particularly easily manufactured.

[0016] A further embodiment is characterized in that a first fastening device is provided for the first battery cells, the fastening device comprising at least two first pressure plates and at least one first fastening member connected to the at least first pressure plates, where at least more than one first battery cells, in particular all first battery cells, are arranged between the first pressure plates in the first stacking direction. The first pressure plates are fastened to one another in the first stacking direction by the first fastening member via the first battery cells arranged between the first pressure plates, whereby the first battery cells arranged between the first pressure plates are held in abutment against one another by being fastened to one another in the first stacking direction.

[0017] A second fastening device is provided for the second battery cells, which includes at least two second pressure plates and at least one second fastening member connected to at least the second pressure plates. The second battery cells, the number of which is more than one, in particular all the second battery cells, are arranged between the second pressure plates in the second stacking direction, and the second pressure plates are fastened to each other in the second stacking direction by the second fastening member via the second battery cells arranged between the second pressure plates. Thus, the second battery cells arranged between the second pressure plates are held in abutment against each other by being fastened to each other in the second stacking direction.

[0018] Preferably, each of the fastening elements is a tension element, also called a tie rod. For example, each of the fastening elements is connected to the corresponding pressure plate by a material and / or form connection. It is also conceivable that each of the fastening elements is glued and / or welded to the corresponding pressure plate. For example, the respective fastening elements are fastened or clamped in the respective restraining direction, so that a force (particularly a tensile force) acts in or via the respective fastening elements (particularly tension elements) in order to clamp the battery cells arranged between the respective pressure plates in the respective stacking direction by the respective fastening elements and thus by the respective fastening devices, and thus to hold them in abutment against each other. In particular, a force formed as a tensile force is transferred from one of the respective pressure plates to the other of the respective pressure plates or vice versa via the respective clamping elements, so that the pressure plates are pulled by a force also called clamping force towards or in the direction of the respective battery cells arranged between the respective pressure plates in the stacking direction and are thus fastened to the respective battery cells arranged between the respective pressure plates. The respective battery cells arranged between the respective pressure plates in the respective stacking direction are thereby pressed against one another in the respective restraining direction and are thus held in abutment against one another. Since the force also called clamping force which clamps the respective battery cells in the respective clamping elements also acts as a tensile force, the respective clamping elements are also called tie rods, in particular since they are exclusively loaded in tension, and the respective fastening devices are also called tie rod systems, for example. This allows a particularly strong retention of the respective battery cells to be achieved, so that a particularly high stiffness can be achieved.

[0019] Here, it has proven to be particularly advantageous if at least one of the first pressure plates is bonded to at least one of the second pressure plates, whereby the cell modules are joined to one another. In particular, it is conceivable that at least one first pressure plate is glued and / or welded to at least one second pressure plate. In this way, the cell modules are rigidly connected to one another via the pressure plates of the fastening devices, so that a high rigidity of the energy store floor arrangement as a whole can be achieved.

[0020] Yet another particularly advantageous embodiment is that the first fastening member is joined to the second fastening member, whereby the cell modules are joined to one another, in other words, the cell modules are preferably joined to one another, i.e. connected to one another, via fastening members, whereby a particularly high strength and rigidity of the cell module block can be achieved.

[0021] In order to achieve a particularly high rigidity in a particularly weight- and assembly-space-saving manner, in a further embodiment of the invention the first fastening member is glued and / or welded to the second fastening member and thus connected.

[0022] A second aspect of the invention relates to a motor vehicle, preferably configured as a passenger car, equipped with an energy store floor arrangement according to the first aspect of the invention, the advantages and advantageous features of the first aspect of the invention being to be regarded as advantages and advantageous features of the second aspect of the invention and vice versa.

[0023] Further details of the invention will become apparent from the following description of preferred embodiments and the drawings. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic front cross-sectional view of an energy store floor arrangement for a motor vehicle, in particular a passenger car; [Diagram 2]FIG. 2 is a schematic exploded perspective view of a cell module of an electric energy store of an energy store floor device; [Diagram 3] FIG. 2 is a schematic perspective view of the upper housing of the storage housing of the electrical energy storage device, as viewed from above. [Figure 4] FIG. 2 is a schematic perspective view of the upper housing as viewed from below. [Diagram 5] FIG. 2 is a schematic perspective view from below of an assembly including an upper housing and a number of cell modules of an electrical energy storage device joined to the upper housing. [Figure 6] FIG. 13 is yet another schematic perspective view from below of an assembly in which battery cells of a cell module are joined to a support structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] In the drawings, identical or functionally similar elements are numbered the same.

[0026] FIG. 1 shows an energy store floor arrangement 1, also called floor arrangement for short, for a motor vehicle, preferably configured as a passenger car, in a schematic front cross-sectional view. The energy store floor arrangement 1 comprises a floor structure 2, which comprises at least two longitudinal members 3, 4. FIG. 1 shows the energy store floor arrangement 1 in its installed state, in the completed state of the motor vehicle equipped with the energy store floor arrangement 1. The longitudinal members 3, 4 are here spaced apart from one another in the transverse direction of the vehicle, which is indicated by a double arrow 5. The floor structure 2 further comprises at least one transverse member 6, which is connected in particular at its two ends to the longitudinal members 3, 4. The longitudinal members 3, 4 are therefore connected to one another via the transverse member 6. It is also conceivable that the floor structure 2 comprises at least one further second transverse member, not shown. In this case, it is conceivable that the transverse members of the floor structure 2 are spaced apart from one another in the longitudinal direction of the vehicle, which is indicated in FIG. 1 by a double arrow 7 and runs perpendicular to the plane of the drawing. The above and below described configurations for the transverse member 6 also apply to the second transverse member and vice versa. The longitudinal members 3, 4 and the transverse member 6 are also referred to collectively as the support members of the floor structure 2. Considered by itself, i.e. by itself, it comprises an intermediate space 8 formed as a through-hole, which is arranged between the longitudinal members 3, 4 in the transverse direction of the vehicle and is bounded on both sides by the respective longitudinal members 3, 4 in relation to the transverse outer side of the vehicle. It is also conceivable that this intermediate space 8 is arranged between the transverse members in the longitudinal direction of the vehicle, which is arranged in such a way that the intermediate space 8 is bounded on both sides by the respective transverse members in the longitudinal direction of the vehicle. The intermediate space 8, also called compartment or intermediate compartment, has a width extending in the transverse direction of the vehicle and a length extending in the longitudinal direction of the vehicle, the width corresponding, for example, to a first distance extending in the transverse direction of the vehicle between the longitudinal members 3, 4.Its length corresponds, for example, to the second distance between the transverse members, extending in the longitudinal direction of the vehicle. Intermediate spaces 8 are therefore arranged between the longitudinal members 3, 4 and between the transverse members.

[0027] In particular, the floor structure 2 is part of the body of the motor vehicle, also called body shell, preferably formed as a self-supporting body (this body is also called skeleton), which defines the interior of the motor vehicle, also called passenger compartment or cabin, in which passengers, such as the driver of the motor vehicle, can stay, for example while the motor vehicle is moving.

[0028] The energy store floor arrangement 1 further comprises an electric energy store 9, for example in the form of a battery, in particular in the form of a high-voltage battery (HV battery). In conjunction with Figs. 3 and 4, it can be seen in particular that the energy store 9 comprises a store housing 10 with an upper housing 11 as a first housing part and a lower housing 12 as a second housing part. The housing parts of the store housing 10 are parts which are formed separately from one another and which are joined together. When the energy store 9 is in the mounted state, the upper housing 11 is arranged above the lower housing 12 in the vehicle height direction, so that the lower housing 12 is arranged below in the vehicle height direction and is therefore arranged below the upper housing 11. The energy store 9 is in its mounted state shown in Fig. 1 in the completed state of the motor vehicle equipped with the floor arrangement (energy store floor arrangement 1). By arranging the energy store 9 below the floor structure 2, it can be seen that the energy store 9 is arranged at least partially below the floor structure 2 in the vehicle height direction, in particular that the energy store 9 is arranged below the cross member 6 in the vehicle height direction. Furthermore, the energy storage body 9, which is formed separately from the floor structure 2, is connected to the floor structure 2 by being joined to the floor structure 2, and as a result, is held by the floor structure 2.

[0029] The intermediate space 8 between the support elements of the floor structure 2 is covered and closed by the upper housing 11, which is in particular fully overlapped below in the vehicle height direction, so that the upper housing 11 serves as a floor plate, for example formed as a floor slab. No additional floor elements are arranged between the support elements that delimit the intermediate space 8 and the upper housing 11 in the vehicle height direction, so that the number of parts and thus the weight, costs and installation space required for the floor device can be kept particularly low. The storage housing 10 comprises a receiving space 13, which is in particular directly bounded in part by the upper housing 11 and in part by the lower housing 12. In conjunction with FIG. 5, it can be seen that the energy storage 9 comprises battery cells 14, also simply referred to as cells. By means of the battery cells 14, electrical energy is stored or is stored, in particular electrochemically. The battery cells 14 are here in particular entirely arranged in the receiving space 13 and thus in the storage housing 10. From FIG. 2 it can be particularly seen that the battery cells 14 are prismatic and therefore prismatic battery cells.

[0030] In order to be able to achieve a particularly high stiffness of the energy store floor arrangement 1 in a particularly space-saving manner, a first one of the battery cells 14, indicated in Figures 2 and 5 with Z1, is arranged in a first stacking direction indicated by a double arrow 15, in a sequenced manner, i.e. one after the other, so as to form a first cell module 16. A second one of the battery cells 14, indicated in Figure 5 with Z2, is arranged in a second stacking direction indicated by a double arrow 17, which runs parallel to the first stacking direction, in a sequenced manner, thus one after the other, so as to form a second cell module 18. The above and the following explanations for the first cell(s) Z1 and for the first cell module 16 also apply without problem to the explanations for the second cell(s) Z2 and for the second cell module 18 and vice versa. From Fig. 5 it can be seen that the cell modules 16, 18 are arranged next to each other in an arrangement direction which extends perpendicular to the stacking direction and is represented in Fig. 5 by a double arrow 19. Moreover, the cell modules 16, 18 are joined to each other, i.e. connected to each other. The cell modules 16, 18 thereby form a particularly large and robust module block 20, also called a block or cell module block. The battery cells Z1, Z2 and thus the module block 20 are joined to the upper housing 11, in particular to the upper housing underside 21 of the upper housing 11. For example, the battery cells Z1, Z2 and thus the module block 20 are joined to the upper housing 11 by being glued to, i.e. glued on, the upper housing underside 21. From FIG. 1 it can be seen that the upper housing underside 21, when the energy storage body 9 is in the installed state, and therefore when the floor structure 2 and the energy storage body floor device 1 are in the installed state, faces downwards in the vehicle height direction as a whole, and in this case faces away from the support members (several), in particular the cross member 6.

[0031] Each battery cell 14, i.e. each first battery cell Z1 and each second battery cell Z2, has a cell housing 22, which can be seen particularly well in FIG. 2. Each cell housing 22 has a respective housing bottom 23 on its respective underside U. On an upper side O of each cell housing 22, which is opposite to the respective underside U, a connection terminal 24, 25 of the respective battery cell 14, also called terminal, is arranged. Via the connection terminal 24, 25, each battery cell 14 can provide the electric energy stored therein. The battery cells Z1, Z2 are glued via their housing bottoms 23 to the upper housing underside 21 and thus to the upper housing 11, so that when the energy store floor device 1 is in the mounted state, the respective underside U faces upwards in the vehicle height direction and, therefore, the respective upper side O, and thus the connection terminal 24, 25, faces downwards in the vehicle height direction. By joining the battery cells Z1, Z2 and thus the module block 20 to the upper housing 11, an assembly generally designated 26 is produced, which comprises the upper housing 11 and the module block 20 joined thereto. Due to the battery cells Z1, Z2 being joined via their respective housing bottoms 23 to the upper housing underside 21 and thus to the upper housing 11, and due to the cell modules 16, 18 being joined to each other, a particularly high rigidity of the assembly 26 can be achieved.

[0032] From Fig. 2 it can be seen that a spacer element 27 may be arranged between every two of the battery cells Z1 in the first stacking direction. The spacer element 27 may be a heat shield or a thermal barrier and may comprise, for example, a layered silicate. Furthermore, each spacer element 27 comprises spacer portions spaced apart from one another in the vehicle height direction, and intermediate regions may be provided in the vehicle height direction and between these spacer portions, in which air may be admitted, so that, for example, an air gap is present in the intermediate regions. Furthermore, it is conceivable that an electrical insulator is arranged in the intermediate regions. The spacer element 27 may comprise a substrate encapsulated in a paint or a film.

[0033] Furthermore, as can be seen from FIG. 2 by way of example of the battery cells Z1, a first fastening device 28 is provided for the first battery cells Z1. The first fastening device 28 comprises at least two first pressure plates 29, 30. The fastening device 28 comprises at least one further third pressure plate 31, which is arranged in the first stacking direction between the pressure plates 29, 30 formed as end plates and is therefore also called intermediate pressure plate. Furthermore, the fastening device 28 comprises a first fastening member 32, also called a first tie rod. The first battery cells Z1 are arranged in the first stacking direction between the pressure plates 29, 30, and the pressure plate 31 is arranged in the first stacking direction between the two first battery cells Z1. Thus, the first battery cells Z1, the number of which is more than one, are arranged in the first stacking direction between the pressure plates 29, 30. Since the fastening members 32 are connected to the pressure plates 29, 30, 31, the pressure plates 29, 30, the pressure plates 29, 31 and the pressure plates 30, 31 are fastened to each other in the first stacking direction by the fastening members 32 via the first battery cells Z1 arranged between the pressure plates 29, 30, 31. As a result, the first battery cells Z1 arranged between the pressure plates 29, 30, 31 are fastened to each other in the first stacking direction, and are thereby held in abutting contact with each other. The fastening members 32 are not disposed on either the upper surface O or the lower surface U, but instead, the fastening members 32 are disposed on a side surface S different from the upper surface O or the lower surface U of each battery cell Z1, and this side surface S faces in the lateral direction of the vehicle or outward in the longitudinal direction of the vehicle, and as a result, it may be considered that the side surface S faces in a direction extending in a plane stretched by the longitudinal direction of the vehicle and the lateral direction of the vehicle. In particular, it may be considered that the fastening member 32 is connected to the pressure plates 29, 30, 31 by being glued and / or welded thereto. Furthermore, it may be considered that the fastening member 32 is joined to the side surface S and thus to the battery cell(s) Z1 via the side surface S, in particular such that the fastening member 32 is glued and / or welded to the side surface S and thus to the battery cell(s) Z1.

[0034] The side surfaces S of the battery cells Z1 face the corresponding side surfaces S of the battery cells Z2, so that the fastening members of the fastening devices provided for the cell modules 16, 18 are arranged on the side surfaces facing each other. In other words, the fastening members of the fastening devices provided for the cell modules 16, 18 are arranged between the cell modules 16, 18 in the arrangement direction. In this case, it is preferable that the fastening members of the fastening devices provided for the cell modules 16, 18 are directly joined to each other, in particular glued and / or welded, so that the cell modules 16, 18 are joined to each other via the fastening members of the fastening devices and are therefore connected to each other. Alternatively or additionally, it is conceivable that the pressure plates of the fastening device 28 provided for the cell module 16 are connected, in particular glued and / or welded, to the pressure plates of the fastening device provided for the cell module 18, so that, for example, the cell modules 16, 18 are joined to one another via the pressure plates of the fastening devices provided for the cell modules 16, 18. This makes it possible to achieve a particularly high rigidity.

[0035] It may be considered that a coolant, preferably a liquid, may flow through the upper housing 11 shown in Figures 3 and 4. In other words, it may be considered that at least one cooling passage, particularly a liquid coolant, extends inside the upper housing 11, so that the battery cells 14 can be cooled through the upper housing 11 by the coolant flowing through the upper housing 11. At this time, it may be considered that heat from the battery cells 14 is transferred through the housing bottoms 23 to the upper housing 11 and further from there to the coolant flowing through the upper housing 11, thereby effectively and efficiently cooling the battery cells 14.

[0036] From FIG. 6 it can be seen that the energy store floor arrangement 1 may also comprise a support structure 33. The support structure 33 is formed separately from the battery cells 14 and the store housing 10 and comprises, for example, cutouts for the emergency vent valves of the battery cells 14. Preferably, the support structure 33 is in particular directly joined, in particular glued and / or welded, to the cell housings 22 of the battery cells 14. Furthermore, the support structure 33 is preferably in particular directly connected, for example glued and / or welded, to the lower housing 12, so that the battery cells 14, in particular the cell housings 22, can be connected to the lower housing 12 with the support structure 33 interposed therebetween. In this case, preferably no direct connection between the battery cells 14 and the lower housing 12 remains. By connecting the battery cells 14 to the lower housing 12 via the support structure 33, a particularly high rigidity can be achieved. In this regard, in particular, the support structure 33 may be considered to be part of the assembly 26 . [Explanation of symbols]

[0037] 1 Energy storage floor device 2-floor structure 3 Vertical members 4 Vertical members 5 Double Arrow 6 Horizontal member 7 Double Arrow 8 Intermediate Space 9 Energy storage 10 Reservoir housing 11 Upper housing 12 Lower housing 13 Storage Space 14 Battery Cells 15 Double Arrow 16 First Cell Module 17 Array Direction 18 Second Cell Module 19 Double Arrow 20 module blocks 21 Underside of upper housing 22 Cell housing 23 Housing bottom 24 Connection terminal 25 Connection terminal 26 Assembly 27 Spacer member 28 Fastening device 29 Pressing plate 30 Pressing plate 31 Pressing plate 32 Fastening member O Top surface S side U bottom surface Z1 First Battery Cell Z2 Second Battery Cell

Claims

1. An energy store floor device (1) for a motor vehicle, comprising: a floor structure (2) having longitudinal members and lateral members (3, 4, 6) connected to one another as support members; an electric energy store (9) arranged under the floor structure (2) and connected to the floor structure (2), the energy store (9) comprising a store housing (10) having an upper housing (11), at least one intermediate space (8) between at least two of the support members (3, 4, 6) being closed by stacking the upper housing downward in a vehicle height direction (34); and a battery cell (14) for storing electric energy arranged in the store housing (10). - first battery cells of the prismatic battery cells (14, Z1) are arranged in a first stacking direction (15) in a sequential order to form a first cell module (16); - second battery cells of the prismatic battery cells (14, Z2) are arranged in a second stacking direction (17) extending parallel to the first stacking direction (15) so as to be aligned in order to form a second cell module (18); the cell modules (16, 18) are arranged adjacent to each other in an arrangement direction (19) extending perpendicular to both of the stacking directions (15, 17) and are joined to each other; the first battery cell (Z1) and the second battery cell (Z2) are joined to the upper housing (11); An energy storage floor device characterized by:

2. 2. The energy store floor device (1) according to claim 1, The first battery cell (Z1) and the second battery cell (Z2) are bonded to the upper housing (11) and thereby joined to the upper housing (11).

3. 3. The energy store floor device (1) according to claim 1 or 2, Each of the battery cells (14, Z1, Z2) has a respective cell housing (22) having a respective housing bottom (23), and each of the cell housings (22) has a connection terminal (24, 25) arranged on an upper surface (O) opposite to the respective housing bottom (23), and the electrical energy stored in each of the battery cells (14, Z1, Z2) can be provided from each of the battery cells via the connection terminal.

4. 4. The energy store floor device (1) according to claim 3, The first battery cell (Z1) and the second battery cell (Z2) are joined to the upper housing (11) via their respective housing bottoms (23), such that when the energy storage floor device (1) is in an installed state, the housing bottoms (23) face upward in the vehicle height direction (34) and the connection terminals (24, 25) face downward in the vehicle height direction (34).

5. 3. The energy store floor device (1) according to claim 1 or 2, a first fastening device (28) is provided for a first of the battery cells (Z1), the fastening device comprising at least two first pressure plates (29, 30) and at least one first fastening member (32) connected to at least the first pressure plates (29, 30), wherein at least more than one first of the battery cells (Z1) are arranged between the first pressure plates (29, 30) in the first stacking direction (15), and the pressure plates are fastened to each other in the first stacking direction (15) via the first of the battery cells (Z1) arranged between the first pressure plates (29, 30) by the first fastening member (32), whereby the first of the battery cells (Z1) arranged between the first pressure plates (29, 30) are fastened to each other in the first stacking direction (15) and are held in abutting contact with each other; a second fastening device is provided for the second battery cell (Z2), the fastening device comprising at least two second pressure plates and at least one second fastening member connected to at least the second pressure plates, wherein at least more than one second battery cell (Z2) is arranged between the second pressure plates in the second stacking direction (17), and the pressure plates are fastened to each other in the second stacking direction (17) by the second fastening member via the second battery cell (Z2) arranged between the second pressure plates, thereby holding the second battery cells (Z2) arranged between the second pressure plates in abutting contact with each other by being fastened to each other in the second stacking direction (17); An energy storage floor device characterized by:

6. 6. The energy store floor device (1) according to claim 5, At least one of the first pressure plates (29, 30) is joined to at least one of the second pressure plates, thereby joining the cell modules (16, 18) to each other.

7. 7. The energy store floor device (1) according to claim 6, 10. An energy store floor device, characterized in that at least one of the first pressure plates (20, 30) is glued and / or welded to at least one of the second pressure plates.

8. 6. The energy store floor device (1) according to claim 5, The energy storage floor device is characterized in that the first fastening member (32) is connected to the second fastening member, thereby connecting the cell modules (16, 18) to each other.

9. 9. The energy store floor device (1) according to claim 8, The energy storage floor device is characterized in that the first fastening member (32) is welded and / or glued to the second fastening member.

10. 3. A motor vehicle equipped with an energy store floor device (1) according to claim 1 or 2.

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