Motor vehicle having a high-voltage battery

Abstract

The invention relates to a motor vehicle having a high-voltage battery as a drive battery, wherein: the motor vehicle comprises at least one sill (1); the high-voltage battery comprises a battery housing; the battery housing comprises a solid cell carrier (2) as a base and a cover (3) above the cell carrier (2), which cover is connected to the cell carrier (2) in a gas-tight manner; the cell carrier (2) of the battery housing is fastened from below by means of screw connections (4) to the sill (1) of the motor vehicle; the solid cell carrier (2) forms a step (5) such that the step (5) runs along at least a partial region of the height of the sill (1), in a manner covering same, on the side of the sill (1) facing the vehicle interior; and the cover (3) is connected to the cell carrier (2) in a gas-tight manner at least at the height of the upper edge of the step (5).

Description

[0001] motor vehicle with a high-voltage battery

[0002] Field of invention

[0003] The present invention relates to a motor vehicle with a high-voltage battery as a traction battery and the method of attaching the high-voltage battery to the motor vehicle.

[0004] State of the art

[0005] It is known that high-voltage batteries are used in motor vehicles to provide electrical energy for a motor vehicle, particularly in electric or hybrid vehicles. A high-voltage battery typically has a battery casing in which the battery cells are arranged. The battery casing may include a solid cell support as a base, which directly or indirectly supports the cells, contributes to the rigidity of the vehicle body, and can be used to attach the high-voltage battery to the vehicle.

[0006] High-voltage batteries take up a relatively large volume in order to have the highest possible storage capacity and are therefore installed in a space-saving manner, for example in the area of ​​the vehicle floor.

[0007] In particular, it is known to arrange a high-voltage battery below the floor panel of a motor vehicle and to attach it to the side sills, i.e., longitudinal members of the motor vehicle. The traction batteries are mounted from below, using screws to the

[0008] 2024P00102 WO 29.01.2026 BZ sills are bolted on. The nuts of the bolts are usually located in the sill.

[0009] Such a motor vehicle with a high-voltage battery whose cell carrier can be mounted on the sills from below is, for example, from the

[0010] DE 102021109394A1 is known.

[0011] Due to tolerances, a sufficiently large gap must usually exist between the sill contour and the battery housing to allow for trouble-free battery installation. Different battery designs and cover placements can result in gaps of varying widths.

[0012] In the event of deformation due to external forces, such as a side impact, this gap can be compressed, causing the sill to become in contact with the battery housing. The forces then act directly on the battery housing. The components are subjected to significant localized deformation, and individual battery mounting screws may break.

[0013] Ideally, the battery housing should be able to safely dissipate the forces that occur without deforming too much and without the battery housing detaching from the vehicle.

[0014] Summary of the invention

[0015] It is an object of the invention to improve a motor vehicle with a high-voltage battery as a traction battery in this respect and in particular to provide a motor vehicle with a high-voltage battery in which forces occurring in a side impact are well dissipated, so

[0016] 2024P00102 WO 29.01.2026 BZ that the safety of the motor vehicle is increased in a side-impact collision.

[0017] The problem is solved by a motor vehicle with a high-voltage battery as a traction battery, wherein the motor vehicle comprises at least one sill, wherein the high-voltage battery comprises a battery housing, wherein the battery housing comprises a solid cell carrier as a base and a cover above the cell carrier which is gas-tightly connected to the cell carrier, wherein the cell carrier of the battery housing is fastened to the sill of the motor vehicle from below by means of screws, wherein the solid cell carrier has a step formed such that the step runs along the side of the sill facing the interior of the vehicle, covering at least a portion of the height of the sill, wherein the cover is gas-tightly connected to the cell carrier at least at the level of the upper edge of the step.

[0018] According to the invention, a solid cell carrier for a high-voltage battery, which is attached from below to a sill, preferably to both sills on the left and right of the vehicle, is itself designed, i.e., shaped, such that it has a step that runs along the sill. The step extends at least to the height of the sill. The attachment of the cover to the cell carrier is located, viewed from the sill, behind the leading edge of the step.

[0019] The step is integrated directly into the cell carrier and, in the event of a side impact, supports the sill earlier against the battery contour than in a design without a step. By incorporating a step into the cell carrier, the sill-battery housing assembly can bottom out sooner, thus relieving stress on components such as the battery mounting bolts. This arrangement can prevent premature breakage of...

[0020] 2024P00102 WO 29.01.2026 BZ Screws can be delayed or prevented in a crash. Furthermore, this can also save on fasteners, and the step can compensate for the missing screw connections in certain load cases.

[0021] The cover is gas-tightly connected to the cell support at least at the level of the upper edge of the step. Preferably, the cover is gas-tightly connected to the cell support at the upper edge of the step, preferably directly connected, apart from any sealing and / or fastening material preferably present between the cell support and the cover.

[0022] Preferably, at least one, preferably several, screw connections by means of which the cell carrier of the battery housing is attached to the sill of the motor vehicle from below are arranged next to the step.

[0023] The lid is preferably screwed gas-tight to the top edge of the cell carrier's step.

[0024] Preferably, the step extends along at least a portion of the sill's height in such a way that its upper edge is approximately at or higher than the upper edge of at least one, preferably several, screw connection by which the battery housing's cell carrier is fastened to the vehicle's sill from below. The screw connections of the battery housing's cell carrier to the sill preferably have a nut located at the top, preferably within the sill, which is preferably at least partially, almost completely, or completely covered laterally by the cell carrier's step.

[0025] 2024P00102 WO 29.01.2026 BZThe step can preferably extend to a height of about 5% to 60% of the height of the sill, preferably between 10% and 30% of the height of the sill.

[0026] Preferably, the cell carrier has a further step that extends upwards from the end of the first step and is formed on the side of the first step facing the vehicle interior. This further step preferably runs along the side of the cover facing the vehicle interior, and is therefore preferably located inside the battery housing. Starting from the mounting level of the cell carrier, the first step and the further step thus form a two-step staircase.

[0027] The cell carrier can be designed as an aluminum die-cast component.

[0028] The cover extends downwards at least laterally, in the area of ​​the two sills on the left and right of the vehicle, and preferably also at the front and rear of the vehicle, so that it forms the side walls of the battery housing. The cover then preferably forms a downward-opening tray. The side walls of the cover are preferably directly and gas-tightly connected to the cell carrier.

[0029] The sill is preferably an aluminum die-cast component. In another embodiment, the sill is a steel component and preferably constructed from steel profiles. In both variants, the cell carrier is preferably attached to the sill by means of screws, which can be mounted in the cell carrier via a sleeve, thus allowing for tolerance compensation in the XY plane of the vehicle. A nut is preferably arranged in the sill.

[0030] 2024P00102 WO 29.01.2026 BZ Preferably, the motor vehicle has sills on both the left and right sides in the Y-direction, extending in the X-direction of the motor vehicle, i.e., longitudinally. Preferably, a step of this kind, as described above, is formed in the cell carrier on both the left and right sides.

[0031] Brief description of the drawings

[0032] The invention is described below by way of example with reference to the drawings.

[0033] Fig. 1 is a sectional view of a motor vehicle not according to the invention with a high-voltage battery, in the area of ​​the attachment of a cell carrier of the high-voltage battery to a sill of the motor vehicle.

[0034] Fig. 2 is a sectional view of a motor vehicle according to the invention with a high-voltage battery, in the area of ​​the attachment of a cell carrier of the high-voltage battery to a sill of the motor vehicle.

[0035] Fig. 3 is a sectional view of another motor vehicle not according to the invention with a high-voltage battery, in the area of ​​the attachment of a cell carrier of the high-voltage battery to a sill of the motor vehicle.

[0036] Fig. 4 is a sectional view of another motor vehicle according to the invention with a high-voltage battery, in

[0037] 2024P00102 WO 29.01.2026 BZ Area of ​​the attachment of a cell carrier of the high-voltage battery to a sill of the motor vehicle.

[0038] Detailed description of the invention

[0039] Fig. 1 shows a motor vehicle not according to the invention with a high-voltage battery, in the area of ​​the attachment of a cell carrier 2 of the high-voltage battery to a sill 1 of the motor vehicle.

[0040] In this arrangement, the main load-bearing component of the battery consists of a one-piece die-cast aluminum component, the cell carrier 2.

[0041] The cover 3 is screwed directly onto the cell carrier 2 and closes off the battery housing at the top. There is a gap between the cover 3 and the sill 1. In this gap, the cover 3 is screwed to the cell carrier 2 by means of a screw 7 on the cover, at the level of the lower edge of the sill 1. If a lateral force is applied, the sill 1 is moved across the gap until it reaches the cover 3 and a raised section of the cell carrier 2 behind it, where it is then locked in place.

[0042] In the embodiment according to the invention shown in Fig. 2, the motor vehicle also includes a sill 1, which here is a die-cast component made of aluminum. The battery housing comprises a solid cell carrier 2 as the base and a cover 3 above the cell carrier 2, which is gas-tightly connected to the cell carrier 2. The cell carrier 2 of the battery housing is fastened to the sill 1 of the motor vehicle from below by means of screws 4.

[0043] On the massive cell carrier 2, a stage 5 is formed in one piece and thus shaped, so that the stage 5 is attached to the vehicle interior.

[0044] 2024P00102 WO 29.01.2026 BZ The cover 3 runs along the side of the sill 1, covering a portion of the height of the sill 1. The cover 3 is gas-tightly connected to the cell carrier 2 at the level of the upper edge of the step 5, namely by means of a screw connection 7 of the cover 3. A seal 8 is arranged between the cover 3 and the cell carrier 2 in the area of ​​the screw connection 7 of the cover.

[0045] In the event of a side impact, the sill 1 is not moved all the way to the cover 3 and does not bridge the gap between sill 1 and cover 3, but is blocked beforehand at step 5 of the cell carrier 2. The edge of step 5 facing sill 1 lies between sill 1 and the screw 7 of cover 3 on cell carrier 2, and thus in front of the gap to cover 3.

[0046] Stage 5 is integrated directly into cell carrier 2 and thus supports sill 1 earlier against the battery contour in the event of a side impact than in a design without a stage. This arrangement can delay or prevent premature bolt breakage in a crash. Furthermore, it allows for savings on fasteners, and Stage 5 can compensate for the missing bolted connections in certain load cases.

[0047] The lid 3 is gas-tightly connected to the upper edge of the step 5 of the cell carrier 2, preferably by screwing.

[0048] The cell carrier 2 has a further stage 6, which extends further upwards from the end of stage 5 and is formed on the side of stage 5 facing the interior of the vehicle, with the further stage 6 running along the side of the cover 3 facing the interior of the vehicle.

[0049] 2024P00102 WO 29.01.2026 BZ The cover 3 is pulled downwards laterally, so that it forms the side walls of the battery housing. The side walls of the cover 3 are directly and gas-tightly connected to the cell carrier 2.

[0050] Fig. 3 shows a variant of a motor vehicle not according to the invention, wherein the battery housing is screwed into a steel sill 1. The screw connection 4 of the battery to the sill 1 can have a weld nut located in the sill 1.

[0051] As shown in Fig. 4, a stage 5 according to the invention in a cell carrier 2 can also be formed in a fastening of a high-voltage battery to a steel sill 1.

[0052] A key feature of this invention is therefore an integrated lateral step 5, which preferably extends over the entire length of the cell carrier 2, which can be made from a one-piece aluminum die-cast component.

[0053] Stage 5 supports the sill 1 earlier against the battery contour in the event of a side impact than in a conventional design without a stage. This arrangement can delay or prevent premature bolt breakage due to excessive material deformation in the sill area during a crash.

[0054] As an alternative, the same cell carrier 2 can also be attached to a steel body, which may have a slightly different deformation behavior.

[0055] 2024P00102 WO January 29, 2026 BZ reference symbol list

[0056] Sill

[0057] Cell carrier

[0058] Lid

[0059] Screw connection (cell carrier on the sill) step

[0060] next level

[0061] 7 Screw connection (cover on cell carrier) 8 Seal

[0062] 2024P00102 WO 29.01.2026 BZ

Claims

Patent claims 1. Motor vehicle with a high-voltage battery as a traction battery, wherein the motor vehicle comprises at least a sill (1), wherein the high-voltage battery comprises a battery housing, wherein the battery housing comprises a solid cell carrier (2) as a base and a cover (3) above the cell carrier (2) which is gas-tightly connected to the cell carrier (2), wherein the cell carrier (2) of the battery housing is fastened to the sill (1) of the motor vehicle from below by means of screws (4), characterized in that the massive cell carrier (2) has formed a step (5) such that the step (5) runs along the side of the sill (1) facing the interior of the vehicle, covering at least a partial area of ​​the height of the sill (1), wherein the cover (3) is gas-tightly connected to the cell carrier (2) at least at the height of the upper edge of the step (5).

2. Motor vehicle according to claim 1 , characterized in that at least one, preferably several, screw connections (4), by means of which the cell carrier (2) of the battery housing is attached to the sill (1) of the motor vehicle from below, are arranged next to the step (5).

3. Motor vehicle according to at least one of the preceding claims, 2024P00102 WO 29.01.2026 BZd is characterized by the fact that the lid (3) is gas-tightly connected, preferably screwed, to the upper edge of the step (5) of the cell carrier (2).

4. Motor vehicle according to at least one of the preceding claims, characterized in that the step (5) extends along at least a partial area of ​​the height of the sill (1) in such a way that the upper edge of the step (5) is approximately at or higher than the upper edge of at least one screw connection (4), preferably several screw connections (4), by means of which the cell carrier (2) of the battery housing is attached to the sill (1) of the motor vehicle from below.

5. Motor vehicle according to at least one of the preceding claims, characterized in that the cell carrier (2) has a further step (6) which extends further upwards from the end of the step (5) and which is formed on the side of the step (5) facing the interior of the vehicle, wherein the further step (6) preferably runs along the side of the cover (3) facing the interior of the vehicle.

6. Motor vehicle according to at least one of the preceding claims, characterized in that the lid (3) is pulled downwards at least laterally, so that it forms the side walls of the battery housing, the side walls of the lid (3) being directly connected to the cell carrier (2) in a gas-tight manner. 2024P00102 WO 29.01.2026 BZ7. Motor vehicle according to at least one of the preceding claims, characterized by the fact that the sill (2) is an aluminium die-cast component or that the sill (2) is a steel component.

8. Motor vehicle after at least one of the previous claims, characterized in that the motor vehicle has such sills (1) on both the left and right sides of the motor vehicle in the Y direction and the cell carrier (2) has such a step (5) as described in at least one of the preceding claims on both the left and right sides adjacent to the sills (1). 2024P00102 WO 29.01.2026 BZ

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