Battery pack integrated with two rocker beams of a vehicle and vehicle

Abstract

The present application relates to a battery pack integrated with two rocker beams of a vehicle, comprising a cell assembly (30) and a frame portion (12) defining an accommodation space (15) for accommodating the cell assembly, characterized in that the frame portion (12) comprises the two rocker beams spaced apart from each other and two end beams (122) connecting the two rocker beams and spaced apart from each other to define the accommodation space (15). The present application also relates to a vehicle comprising the above battery pack.

Description

Technical Field

[0001] This application relates to a battery pack integrated with two door sill beams of a vehicle, particularly, but not limited to, a CTC (Cell to Chassis) battery pack, and also to a vehicle including such a battery pack. Background Technology

[0002] Traditional battery packs are supplied independently of the vehicle and are separate components. The battery pack includes a separate housing for housing the battery cells. The entire battery pack is secured to the vehicle body via mounting points located around and / or in the center of the housing. Traditional vehicle bodies are monocoque, with the battery pack fixed beneath the floor. Top and bottom covers are located above and below the battery cells, respectively, and these are attached to the housing to enclose the cells. However, in separately supplied battery packs, the top cover assembly is independent of the vehicle floor, and sufficient clearance must be allowed between the top cover and the floor to accommodate installation and tolerances. The entire battery pack extends downwards from the vehicle floor, resulting in a small ground clearance. Utility Model Content

[0003] The purpose of this application is to provide a novel battery pack that is integrated with the door sill beam of a vehicle.

[0004] In a first aspect, a battery pack integrated with two sill beams of a vehicle is provided, including a cell assembly and a frame portion defining an accommodating space for receiving the cell assembly, characterized in that: the frame portion includes the two sill beams spaced apart from each other and two end beams connecting the two sill beams and spaced apart from each other to define the accommodating space.

[0005] In one embodiment, the battery pack further includes a top cover assembly and a bottom plate assembly, respectively attached to opposite sides of the frame portion in the direction in which the cell assembly is mounted into the accommodating space to enclose the cell assembly within the accommodating space.

[0006] In one embodiment, the cover assembly includes a cover plate on the surface of the cover plate opposite to the cell assembly, to which a seat beam for mounting a vehicle seat is attached.

[0007] In one embodiment, the battery pack further includes a thermal management component that is attached to the cell assembly to enable heat exchange between the two.

[0008] In one embodiment, the thermal management component is fixed to a first side of the cell assembly facing the top cover assembly.

[0009] In one embodiment, the thermal management component is bonded to a first side of the cell assembly using structural adhesive. In another embodiment, the frame portion further includes a support portion extending from the frame portion into the accommodating space to support the cell assembly, wherein a second side of the cell assembly facing the base plate assembly and opposite to the first side is bonded to the support portion. In yet another embodiment, the battery pack further includes a buffer disposed between the top cover assembly and the thermal management component.

[0010] In one embodiment, the thermal management component is fixed to a second side of the cell assembly opposite to the first side, facing the base plate assembly.

[0011] In one embodiment, the thermal management assembly includes downward-facing openings for explosion-proof valves that allow exposure of the individual cells of the cell assembly. In one embodiment, the thermal management assembly is bonded to the top cover assembly using structural adhesive. In one embodiment, the thermal management assembly is bonded to a second side of the cell assembly using structural adhesive.

[0012] In one embodiment, the cell assembly includes a plurality of cell modules, and the frame portion further includes at least one intermediate crossbeam extending parallel to the end beam and / or at least one intermediate longitudinal beam extending parallel to the sill beam to divide the accommodating space into a plurality of subspaces accommodating one of the plurality of cell modules.

[0013] In one embodiment, each of the opposite ends of each of the at least one intermediate crossbeam is connected to the threshold beam or the intermediate longitudinal beam; each of the opposite ends of each of the at least one intermediate longitudinal beam is connected to the end beam or the intermediate crossbeam.

[0014] In one embodiment, the frame portion further includes extensions extending from at least one of the two end beams along the extension direction of the threshold beam.

[0015] In one embodiment, the battery pack is a CTC battery pack.

[0016] In a second aspect, a vehicle is provided, including the battery pack integrated with the two sill beams of the vehicle as described above, wherein the frame portion further includes extensions extending from at least one of the two end beams along the extension direction of the sill beams, wherein the battery pack further includes a cover assembly including a cover plate serving as a vehicle floor and a seat beam fixed to the cover plate for mounting a vehicle seat; and an electric drive component mounted to the extensions.

[0017] The battery pack according to this application generally includes cell assemblies and a frame portion defining an accommodating space for housing the cell assemblies. The frame portion is defined by two spaced-apart vehicle sill beams and two end beams connecting the two sill beams. The frame portion includes protrusions extending from the frame portion into the accommodating space for supporting the cell assemblies. The two side beams of the frame portion are formed by the vehicle's sill beams, integrating the battery pack into the vehicle's sill beams, eliminating the need for side beams on both sides of the traditional battery pack housing, reducing overall vehicle weight, and achieving higher integration. Compared to a separately supplied battery pack, this integration also reduces the dimension in the height direction, allowing for an increase in the height of the energy-providing cell assemblies or the arrangement of more cell units, increasing the vehicle's driving range. Since the frame portion includes the sill beams as part of the vehicle body, or in other words, the cell assemblies are integrated into the chassis, the assembly of the cell assemblies needs to be completed at the chassis level. Simultaneously, the frame portion may include extensions extending in opposite directions from the two end beams for securing and integrating vehicle components such as electric drive systems, further enhancing integration. The vehicle body can be a non-load-bearing body, with the chassis and body decoupled and developed separately and in parallel, which is more conducive to the standardization and platformization of vehicle components. Furthermore, the battery pack of this application includes a top cover assembly and a bottom plate assembly that enclose the battery cell components within an accommodating space on opposite upper and lower sides. A seat beam for mounting the vehicle seats is attached to the top cover assembly of the battery pack. The top cover assembly can also function as a vehicle floor, eliminating the need for an additional floor design above the battery pack. A seal is provided above the top cover in this area to ensure the sealing performance of the passenger compartment. This utility model solution has a higher degree of integration and eliminates the gap between the top cover and the floor, resulting in greater weight reduction. This saved dimension can be used to increase power capacity, improve the ergonomics of the passenger compartment, or raise the battery pack to increase ground clearance, and the bottom plate can be weakened. Attached Figure Description

[0018] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and do not limit the scope of the present invention. In the drawings:

[0019] Figure 1 This is an exploded perspective view of a CTC battery pack according to a first exemplary embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A 3D view of the cell carrier components of a CTC battery pack;

[0021] Figure 3 yes Figure 1 A 3D view of the top cover assembly of the CTC battery pack;

[0022] Figure 4This is an exploded perspective view of a CTC battery pack according to a second exemplary embodiment of the present invention. Detailed Implementation

[0023] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. However, those skilled in the art should understand that these exemplary embodiments are for illustrative purposes only and do not constitute any limitation on the present invention. Furthermore, features of the various embodiments of the present invention can be combined with each other unless otherwise specified. Additionally, for the sake of brevity, other components unrelated to the innovative aspects of the application are omitted from the drawings, but this does not mean that the CTC battery pack of the present invention cannot include other components.

[0024] This invention provides a CTC battery pack integrated with the sill beam of a vehicle. First, refer to... Figures 1 to 3 This invention describes a CTC battery pack 100 according to a first exemplary embodiment of the present invention. It is understood that the following description uses a CTC battery pack as an example, but the present invention is not limited thereto. Other battery packs with integrated sill beam structures are also within the scope of this invention.

[0025] The CTC battery pack 100 of the first exemplary embodiment generally includes a cell carrier assembly 10, a top cover assembly 20, a cell assembly 30, a base plate assembly 40, and a thermal management assembly 50.

[0026] The cell carrier assembly 10 may include a frame portion 12 defining a generally rectangular accommodating space 15 for accommodating or receiving the cell assembly 30. The frame portion 12 includes two end beams 122 and two side beams 124 connecting the two end beams 122. An advantage of this application is that the two side beams 124 of the frame portion 12 are two sill beams forming part of the vehicle chassis (not shown), therefore, the extension direction of the side beams 124 is defined as the longitudinal direction L, which is the same as the vehicle's longitudinal direction. Thus, the two end beams 122 of the frame portion 12 are spaced apart in the longitudinal direction L (and are therefore also referred to as front and rear beams), and the two side beams 124 are spaced apart in a width direction A (which is the same as the vehicle's width direction) perpendicular to the longitudinal direction L. The vertical direction T (understood with reference to the figures) is perpendicular to both the longitudinal direction L and the width direction A, and defines opposite first or upper and second or lower sides.

[0027] The battery cell assembly 30 may include one or more battery cell modules, each battery cell module may include one battery cell or multiple battery cells arranged side by side and electrically connected together. Each battery cell module may include the same or different numbers and / or specifications of battery cells. In the illustrated example, the battery cell assembly 30 includes six battery cell modules arranged in two rows and three columns, wherein the rows extend along the width direction A and the columns extend along the longitudinal direction L. Those skilled in the art should understand that this application does not limit any of the following details or aspects of the battery cell assembly 30: the number of battery cell modules included in the battery cell assembly 30, the number of rows and columns of battery cell modules arranged, the number of battery cell modules arranged in each row or each column, the number of battery cells included in each battery cell module, and the type of battery cells included in any battery cell module.

[0028] Corresponding to the arrangement of the cell modules in the cell assembly 30, the frame portion 12 may further include one or more intermediate crossbeams 126 extending in the width direction A and / or one or more intermediate longitudinal beams 128 extending in the longitudinal direction L, so as to divide the accommodating space 15 into multiple subspaces. The number and arrangement of the intermediate crossbeams 126 and intermediate longitudinal beams 128 can be rationally designed such that, in the plane defined by the longitudinal direction L and the width direction A, each subspace has a shape and size suitable for accommodating or receiving a corresponding cell module among the multiple cell modules. In the case where the cell assembly 30, as shown in the figure, includes six cell modules in two rows and three columns, the frame portion 12 includes one intermediate crossbeam 126 and two intermediate longitudinal beams 128 to define six subspaces corresponding to the six cell modules. It can be understood that each subspace is defined by a subframe portion formed by two sub-longitudinal beams extending in the longitudinal direction L and two sub-transverse beams extending in the width direction A. Each sub-longitudinal beam can be a section of an intermediate longitudinal beam and / or a threshold (edge) beam, or a section of an intermediate longitudinal beam and / or a threshold (edge). Each sub-transverse beam can be a section of an intermediate transverse beam and / or an end beam 122, or a section of an intermediate transverse beam and / or an end beam 122. The subframe portions of two adjacent subspaces in the width direction A share a sub-longitudinal beam, and the subframe portions of two adjacent subspaces in the longitudinal direction L share a sub-transverse beam.

[0029] In the vertical direction T, the accommodating spaces 15, specifically each subspace, are open towards the first side or the upper side, thus the cell assemblies 30, specifically each cell module, are configured to be installed in the corresponding subspace from the first side. For each subspace, the subframe portion defining the subspace includes a support portion extending from at least one of its two longitudinal beams and two transverse beams into the subspace to support the corresponding cell module from the second side (the lower side shown in the figure). For each subspace, the support portion may include one or two longitudinal protrusions extending from one or two longitudinal beams in the longitudinal direction L, and / or one or two transverse protrusions extending from one or two transverse beams.

[0030] As an example, in Figure 2 In the illustration, for subspace 15a, the supporting portion of its subframe includes a first protrusion 128b extending from sub-longitudinal beam 128a (a section of the first intermediate longitudinal beam 128 of the two intermediate longitudinal beams) into subspace 15a, and a second protrusion (not shown) extending from another sub-longitudinal beam (a section of one of the threshold beams 124) into subspace 15a. For subspace 15b, the supporting portion of its subframe includes a third protrusion 128d extending from sub-longitudinal beam 128c (a section of the second intermediate longitudinal beam 128 of the two intermediate longitudinal beams) into subspace 15b, and a fourth protrusion (not shown) extending from another sub-longitudinal beam (a section of the first intermediate longitudinal beam 128) into subspace 15b. It is conceivable that, as an addition or alternative, the supporting portion of the subframe of each subspace may also include a protrusion extending from the intermediate crossbeam and / or end beam 122 (or a section thereof) into the corresponding subspace.

[0031] Each cell module (lower surface) of the cell assembly 30 can be bonded to the support portion (protrusion) within its subspace using structural adhesive 11. However, this application is not limited to bonding and fixing each cell module to the support portion of the cell carrier assembly 10; any other possible fixing method may be used.

[0032] Furthermore, such as Figure 1 and 2 As shown, the intermediate crossbeam 126 connects two side beams 124, and each intermediate longitudinal beam 128 is divided into two segments by the intermediate crossbeam 126. This structure is understood to be preferable, contributing to improved rigidity and side-impact performance of the vehicle chassis. However, this is not mandatory; it is also conceivable that each intermediate longitudinal beam 128 can connect to two end beams 122, and the intermediate crossbeam 126 can be divided into multiple segments by each intermediate longitudinal beam 128. In summary, each of the opposite ends of each intermediate crossbeam 126 is connected to either a side beam 124 or an intermediate longitudinal beam 128, and each of the opposite ends of each intermediate longitudinal beam 128 is connected to either an end beam 122 or an intermediate crossbeam 126, forming a truss structure. The number and spacing of the intermediate crossbeams 126 and intermediate longitudinal beams 128 can be adaptably changed according to the number and size of the battery cell modules in the battery cell assembly 30.

[0033] As described above, the lower side of the cell assembly 30 is fixed, specifically bonded, to the cell support assembly 10 (specifically, a support portion formed by a protrusion extending from the frame), and a thermal management assembly 50 is disposed on the upper side of the cell assembly 30. The thermal management assembly 50, also known as a cold plate or cold plate assembly, is made of any thermally conductive material (e.g., copper). The thermal management assembly 50 has internal channels that allow cooling fluid to flow, facilitating heat exchange with the cell assembly 30 and removing heat generated during operation. The thermal management assembly 50 can also be fixed to the cell assembly 30 by adhesive bonding (e.g., using thermally conductive structural adhesive 13). Thus, in the first exemplary embodiment of this application, the opposite upper and lower sides of the cell assembly 30 are bonded to the thermal management assembly 50 and the support portion of the cell support assembly 10, respectively, forming a "sandwich"-like structure, significantly improving the overall rigidity of the battery pack.

[0034] As described above, the top cover assembly 20 and the bottom plate assembly 40 are respectively attached to the upper and lower sides of the frame portion 12, for example, but not limited to, by threaded connections known in the art.

[0035] Figure 3 An exploded view of the cover assembly 20 of the CTC battery pack 100 is shown. The cover assembly 20 includes a cover body 22 having an upper surface 222 and a lower surface (not shown) opposite in the vertical direction T. The cover assembly 20 includes seat beams 24 fixed to the upper surface 222 of the cover body 22 for securing, mounting, or attaching a vehicle seat (not shown). The seat beams 24 can have any suitable number, size, and arrangement, and are directly attached to the upper surface 222 of the cover body 22 in any manner known in the art. In the illustration, a plurality of seat beams 24 are spaced apart in the longitudinal direction L, and each seat beam 24 may extend across the entire cover body 22 in the width direction A. The lower surface of the cover body 22 is sealed at its outer periphery to the corresponding surface of the frame portion 12 of the cell carrier assembly 10 by a seal 28 to effectively prevent external contaminants from entering and contaminating the space where the cell assembly 30 is located. The cushioning element 26 is disposed between the inner region of the lower surface of the upper cover 22 and the thermal management assembly 50 to prevent damage to the thermal management assembly 50 and the battery cells of the battery cell assembly 30 during passenger compartment trampling. Preferably, the cushioning element 26 is made of any possible cushioning material and has dimensions that substantially cover the thermal management assembly 50. As a simple example, the upper cover 22 of the upper cover assembly 20 can be attached to the frame portion 12 by bolt connection.

[0036] According to this application, the upper cover 22 of the upper cover assembly 20 can itself serve as the floor of the vehicle body, so the vehicle body does not need to have an additional floor design above the CTC battery pack 100. Although not shown in the figure, it is conceivable that the upper surface 222 of the upper cover 22 of the upper cover assembly 20 is also provided with a seal to ensure the sealing performance of the passenger compartment. The CTC battery pack 100 of this application has a higher degree of integration and is lighter. In addition, the vertical dimension of the CTC battery pack 100 is smaller, increasing the ground clearance. This saved height dimension can be used to increase the height dimension of the cell assembly 30 or increase the number of cells arranged, so as to increase the power provided by the battery pack and improve the ergonomics of the passenger compartment.

[0037] The base plate assembly 40 can be constructed, but is not limited to, the flat plate member shown in the figure. It can be attached or fixed to the bottom of the frame portion 12 of the cell carrier assembly 10 by means such as bolts, covering and sealing the cell assembly 30 from below to prevent external contaminants from entering and contaminating the cell assembly 30. When each cell of each cell module in the cell assembly 30 includes a downward-facing explosion-proof valve on its bottom (or lower) side, the cell carrier assembly 10 and the base plate assembly 40, which are fixed together, can jointly define a thermal runaway venting channel between them. When a cell thermal runaway occurs and the explosion-proof valve opens, the flue gas is discharged from the CTC battery pack 100 through the thermal runaway venting channel. Similarly, the base plate assembly 40 can also be attached to the frame portion 12 by bolts.

[0038] As described in the first embodiment above, the frame portion 12 for mounting the cell assembly 30 includes the vehicle's sill beam as its side beam 124, or the CTC battery pack including the cell assembly 30 is integrated with the vehicle's sill beam, particularly forming the sill beam as part of the frame portion 12, which is particularly advantageous compared to a battery pack provided separately from the vehicle body, eliminating the need for a separate battery pack housing structure. The vehicle's sill beam is part of the vehicle chassis; in this sense, the CTC battery pack is directly attached to or mounted to the sill beam, which is part of the vehicle chassis, or in other words, the CTC battery pack is directly mounted to the vehicle chassis.

[0039] As shown in the figure, the cell-supporting assembly 10 includes extensions 14 and 16 extending longitudinally in the direction L from the two end beams 122 of the frame portion 12 toward opposite sides, for fixing and integrating vehicle components such as electric drive systems, allowing for higher integration of the vehicle chassis. Vehicles using this structure can have a non-load-bearing body, with the chassis and upper body decoupled and developed separately and in parallel, which is more conducive to the standardization and platformization of vehicle components. Because this integrated structure omits the battery pack housing, the cell assembly 30 is housed within the height space of the vehicle chassis, saving space or dimensions in the vertical direction T compared to a structure where a separately supplied CTC battery pack is fixed under the vehicle floor. The saved dimensions allow for the placement of more cells, increasing the total charge the battery pack can provide and increasing the vehicle's driving range. Furthermore, from another perspective, the vehicle's sill beams form part of the housing of the CTC battery pack 100, eliminating the need for two side beams in the housing, reducing overall vehicle weight, and achieving higher integration.

[0040] Figure 4 A CTC battery pack according to a second exemplary embodiment of the present invention is shown, wherein structural components identical to those in the CTC battery pack of the first exemplary embodiment are indicated by the same reference numerals. This second exemplary embodiment differs from the first exemplary embodiment in that, in the vertical direction T, the thermal management component 50 is sandwiched between the cell assembly 30 and the cell support assembly 10 (specifically, a support portion for supporting the cell assembly 30), located below the cell assembly 30. The cell assembly 30 is bonded to the thermal management component 50 by thermally conductive structural adhesive 23. In addition to heating and cooling the cell, the thermal management component 50 also serves as the main load-bearing structure of the cell assembly 30, transmitting force to the support portion of the cell support assembly 10.

[0041] Correspondingly, this second exemplary embodiment differs from the first exemplary embodiment in that: the upper cover assembly 20 is bonded to the corresponding upper surface of the cell assembly 30 by structural adhesive 21, rather than ( Figure 1 The thermal management component 50 is bonded together. The presence of structural adhesive 21 acts as a buffer, preventing damage to the battery cells of the battery cell assembly 30 during passenger compartment trampling. The thermal management component 50, battery cell assembly 30, and top cover assembly 20 together form a sandwich-like structure, greatly improving the overall rigidity of the package.

[0042] Since the thermal management assembly 50 is bonded to the lower surface of the cell assembly 30 (each cell of each cell module), if the cell includes a downward-facing explosion-proof valve, the thermal management assembly 50 may include an opening (not shown) that allows the explosion-proof valve of each cell to be exposed. Meanwhile, the cold plate forming the thermal management assembly 50 preferably has a large thickness to provide sufficient mechanical strength to withstand and transmit mechanical forces from the cell assembly 30.

[0043] Exemplary embodiments of the CTC battery pack of this application have been described in detail above with reference to the accompanying drawings. Those skilled in the art should understand that various additions, deletions, and modifications can be made to the details described above and shown in the drawings without departing from the spirit and scope of this application, all of which fall within the protection scope of this application.

Claims

1. A battery pack integrated with two door sill beams of a vehicle, comprising a cell assembly (30) and a frame portion (12), the frame portion (12) defining an accommodating space (15) for accommodating the cell assembly, characterized in that: The frame portion (12) includes the two sill beams spaced apart from each other and two end beams (122) connecting the two sill beams and spaced apart from each other to define the accommodating space (15).

2. The battery pack integrated with the two door sill beams of a vehicle according to claim 1, characterized in that, Also includes: In the direction in which the cell assembly (30) is installed into the accommodating space, the top cover assembly (20) and the bottom plate assembly (40) are respectively attached to opposite sides of the frame portion (12) to enclose the cell assembly (30) in the accommodating space (15).

3. The battery pack integrated with the two sill beams of a vehicle according to claim 2, characterized in that, The upper cover assembly (20) includes an upper cover plate (22) on the surface of the upper cover plate (22) opposite to the cell assembly (30) for attaching a seat beam (24) for mounting a vehicle seat.

4. The battery pack integrated with the two sill beams of a vehicle according to claim 2, characterized in that, It also includes a thermal management component (50) that is fixed to the cell assembly (30) to enable heat exchange between the two.

5. The battery pack integrated with the two sill beams of a vehicle according to claim 4, characterized in that, The thermal management component (50) is fixed to the first side of the cell assembly (30) facing the cover assembly (20).

6. The battery pack integrated with the two sill beams of a vehicle according to claim 5, characterized in that... At least one of the following: The thermal management component (50) is bonded to the first side of the cell assembly (30) with structural adhesive; The frame portion (12) also includes a support portion extending from the frame portion into the accommodating space (15) to support the cell assembly (30), wherein a second side of the cell assembly (30) facing the base plate assembly (40) opposite to the first side is adhered to the support portion. The battery pack also includes a buffer (46) disposed between the top cover assembly (20) and the thermal management assembly (50).

7. The battery pack integrated with the two sill beams of a vehicle according to claim 4, characterized in that, The thermal management component (50) is fixed to the side of the cell assembly facing the base plate assembly (40).

8. The battery pack integrated with the two sill beams of a vehicle according to claim 7, characterized in that... At least one of the following: The thermal management assembly (50) includes downward-facing openings of explosion-proof valves that allow exposure of each cell of the cell assembly (30); The thermal management component (50) is bonded to the top cover component (20) with structural adhesive. The thermal management component (50) is bonded to the cell assembly (30) with structural adhesive.

9. The battery pack integrated with the two sill beams of a vehicle according to any one of claims 1-8, characterized in that, The cell assembly (30) includes multiple cell modules, and the frame portion (12) further includes at least one intermediate crossbeam extending parallel to the end beam and / or at least one intermediate longitudinal beam extending parallel to the sill beam to divide the accommodating space (15) into multiple subspaces accommodating one of the multiple cell modules.

10. The battery pack integrated with the two door sill beams of a vehicle according to claim 9, characterized in that, Each of the opposite ends of each of the at least one intermediate crossbeam is connected to the threshold beam or the intermediate longitudinal beam; each of the opposite ends of each of the at least one intermediate longitudinal beam is connected to the end beam or the intermediate crossbeam.

11. The battery pack integrated with the two sill beams of a vehicle according to claim 10, characterized in that, The frame portion (12) also includes extensions (14, 16) extending from at least one of the two end beams along the extension direction of the threshold beam.

12. The battery pack integrated with the two sill beams of a vehicle according to any one of claims 1-8, characterized in that, The battery pack is a CTC battery pack.

13. A vehicle, characterized in that, include: The battery pack integrated with two sill beams of a vehicle according to any one of claims 1-12, wherein the frame portion (12) further includes extensions (14, 16) extending from at least one of the two end beams along the extension direction of the sill beams, wherein the battery pack further includes a cover assembly (20) comprising a cover plate (22) serving as a vehicle floor and a seat beam (24) fixed to the cover plate (22) for mounting a vehicle seat. and An electrically driven component installed in the extension.

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