High-pressure storage device for motor vehicles

Abstract

The present invention relates to a high-voltage storage device (1) for a motor vehicle, the high-voltage storage device having a plurality of battery cells (3); having a housing element (2) on which the battery cells (3) are held; having at least one longitudinal beam (4) on which the housing element (2) is held and the longitudinal beam has a safe distance (6) to the battery cells (3) along a distance direction (7), wherein the longitudinal beam (4) has at least one rated deformation area (9), by constructing the rated deformation area, the rated deformation of the longitudinal beam (4) when a force is applied to the longitudinal beam (4) along the distance direction (7) can be predetermined, thereby maintaining the safe distance (6).

Description

Technical Field

[0001] This invention relates to a high-pressure storage device for motor vehicles. Background Technology

[0002] DE 10 2016 110 787 A1 discloses a battery housing for a towing battery of a motor vehicle, the towing battery being integrated into the underbody structure of the motor vehicle. The battery housing includes at least one base plate and two side walls, with a plurality of receiving spaces between them, each containing at least one battery module. A plurality of deformable elements spaced apart from each other along the longitudinal direction of the motor vehicle are mounted on the inner side of the side walls, and lateral deformation chambers are formed in the regions of the deformable elements between the battery module and the side walls. Each deformable element can deform in a collision and absorb energy at that moment. This avoids the battery module itself directly abutting against the side walls of the battery housing.

[0003] In addition, DE 10 2014 001 289 B3 discloses a motor vehicle having multiple battery elements, which are housed in a first module and a second module for the respective multiple battery elements. In the first module, the battery elements are arranged together to deform in relation to force and are movably positioned relative to each other. In the second module, the arrangement of the battery elements is movable in relation to force, maintaining only their shape without damage. In the event of a side impact, the door sill can be pressed into the first module, whereby the first module deforms and moves together, converting kinetic energy. The force exerted is thus partially converted into deformation through the deformation of the vehicle's door sill and other body parts, and through the movement of the battery elements disposed in the first module. Summary of the Invention

[0004] The objective of this invention is to create a high-voltage storage device for motor vehicles, by virtue of which the battery cells of the high-voltage storage device can be particularly advantageously protected from damage in the event of an accident.

[0005] According to the present invention, the task is solved by a high-pressure storage device for motor vehicles according to the present invention.

[0006] This invention relates to a high-voltage storage device for a motor vehicle, the high-voltage storage device having multiple battery cells. The high-voltage storage device provides electrical energy to the electric drive system of the motor vehicle. The high-voltage storage device also includes a housing element on which the battery cells are held. Specifically, the battery cells can be laid on the housing element. The high-voltage storage device also includes at least one longitudinal beam on which the housing element is held. The longitudinal beam is particularly a longitudinal profile, by means of which the high-voltage storage device is stabilized in the longitudinal direction. Specifically, the longitudinal beam comprises multiple profiles extending parallel to each other in their longitudinal extension direction, the profiles being particularly capable of being hollow profiles having corresponding profile cross-sections. Specifically, the high-voltage storage device includes at least two longitudinal beams disposed on opposite outer sides of the housing element. The at least one longitudinal beam includes at least one predetermined safety distance to the battery cells in the distance direction. Here, the distance between the longitudinal beam and the battery cells of the high-voltage storage device can accurately have a safety distance or a distance greater than the safety distance in the distance direction. The safety distance is the so-called survival space of the battery cells. It can be predetermined by the dynamic distance of the high-voltage storage device.

[0007] To reliably maintain a safe distance, according to the present invention, the longitudinal beam has at least one rated deformation region. By constructing this rated deformation region, the rated deformation of the longitudinal beam when a force is applied to it along the distance direction can be predetermined, thereby maintaining the safe distance. This means that the longitudinal beam has a special geometry within the rated deformation region, which, through this special geometry, predetermines the deformation of the longitudinal beam when an external force is applied to it along the distance direction, thereby ensuring that at least substantially a safe distance between the battery cell and the longitudinal beam is maintained when a lateral force is applied to the longitudinal beam along the distance direction. In particular, the rated deformation region is constructed such that at least until a predetermined critical force is applied to the longitudinal beam along the distance direction, no damage to the safe distance occurs during longitudinal beam deformation. This results in a particularly low risk of damage to the battery cell of the high-voltage storage device in the event of an accident involving a vehicle with a high-voltage storage device, and consequently, a particularly low risk of injury to the occupants of the vehicle with the high-voltage storage device.

[0008] In another embodiment of the invention, it has proven advantageous that the longitudinal beam has at least one longitudinal groove and / or milled portion and / or hole in the rated deformation region, by means of which the rated deformation is predetermined. This means that the longitudinal beam is provided with the longitudinal groove and / or milled portion and / or hole after it has been manufactured, for example, by an extrusion method. Through the at least one longitudinal groove and / or milled portion and / or hole in the rated deformation region, the longitudinal beam has a material weakening portion in the rated deformation region. This material weakening portion allows for targeted pre-determining of the deformation of the longitudinal beam when a force is applied laterally to the longitudinal beam in the distance direction. By targeted pre-determining of the deformation, the maintenance of a safe distance between the battery cell and the at least one longitudinal beam can be at least substantially ensured when a force is applied to the longitudinal beam in the distance direction.

[0009] In another embodiment of the invention, it has proven advantageous that the longitudinal beam has at least one concave profile shape and / or convex profile shape along the distance direction in the rated deformation region, by means of which the rated deformation is predetermined. In other words, the longitudinal beam has at least one profile extending obliquely in the distance direction in the rated deformation region, the profile having a concave cross-section and / or a convex cross-section, by means of which the rated deformation is predetermined. The profile extends in its longitudinal direction, particularly perpendicular to the distance direction. Here, the profile extends in its longitudinal direction, particularly along the vehicle longitudinal direction of a motor vehicle with a high-pressure storage device. The profile is particularly manufactured by an extrusion method. Here, the profile has at least segmentally convex and / or concave cross-sections, wherein the longitudinal beam is selectively and locally weakened by the concave or convex cross-sections, wherein the convex or concave shape of the cross-sections can determine the deformation direction of the longitudinal beam in the rated deformation region.

[0010] In another embodiment of the invention, it has proven advantageous that the longitudinal beam has at least one profile extending obliquely in the distance direction, particularly perpendicular to the distance direction, in the rated deformation region. This profile has a cross-section that rises and / or falls in the distance direction, by means of which the rated deformation is predetermined. This means that the longitudinal beam has at least one profile extending in its longitudinal direction along the vehicle's longitudinal direction, particularly manufactured by an extrusion method, wherein the profile has a rising and / or falling cross-section along the distance direction, at least in the longitudinal region. Here, the cross-section rises or falls in the vehicle height direction. This means that the longitudinal beam has an oblique cross-section, at least in the longitudinal region, along the distance direction. Here, in particular, the upper and / or lower sides of the longitudinal beam are oblique in the distance direction and thus configured to rise or fall along the distance direction in the vehicle height direction. By orienting the longitudinal beams accordingly, the deformation motion of the longitudinal beams in the rated deformation zone when a force is applied to the longitudinal beams along the distance direction can be predetermined, thereby ensuring at least substantially that the safe distance between the battery cells of the high-voltage storage device and the at least one longitudinal beam is maintained when a force is applied.

[0011] In another embodiment of the invention, it has proven advantageous that the longitudinal beam has at least one profile extending obliquely in the distance direction within the rated deformation region, the profile having a trapezoidal cross-section by means of which the rated deformation is predetermined. This means that the longitudinal beam has said at least one profile oriented in its longitudinal extension direction, particularly perpendicular to the distance direction and / or along the vehicle's longitudinal direction. The trapezoidal cross-section of the profile should be understood to mean that at least two opposing sides of the cross-section extend obliquely and therefore not parallel to each other. Furthermore, the at least two opposing sides of the cross-section have different lengths along the periphery of the cross-section. The cross-section extends particularly along the vehicle height direction of the motor vehicle and along the vehicle's lateral direction and at least substantially perpendicular to the vehicle's longitudinal direction. By means of said at least one profile with a trapezoidal cross-section in the longitudinal beam, the deformation movement of the longitudinal beam when a force acts on the longitudinal beam in the distance direction from the outside and therefore from the side of the longitudinal beam opposite the high-pressure storage device can be predetermined with particular precision. In particular, the movement and / or bending and / or folding of the longitudinal beam in the rated deformation zone can be predetermined, and the maintenance of a safe distance between the battery cell and the longitudinal beam is ensured by the movement and / or bending and / or folding.

[0012] In another embodiment of the invention, it has proven advantageous that the longitudinal beam is an extruded profile and has at least one gap in the rated deformation region, by means of which the rated deformation is predetermined. The longitudinal beam thus has at least one gap in the distance direction, which is specifically vorhalted during the manufacture of the longitudinal beam. By selecting the geometry and / or location and / or orientation of the gap, the deformation of the longitudinal beam in the rated deformation region when forces are applied laterally to the longitudinal beam in the distance direction can be predetermined. By specifically predetermining the deformation movement of the longitudinal beam when forces are applied laterally to the longitudinal beam in the distance direction, at least substantially, maintenance between the battery cell and the longitudinal beam under force is ensured, thereby ensuring a particularly high battery cell life and a particularly low risk of injury to vehicle occupants when forces are applied laterally to the longitudinal beam.

[0013] Other features of the invention are derived from the accompanying drawings and the description thereof. The features and combinations thereof mentioned above in the specification, as well as the features and combinations thereof mentioned below in the description of the drawings and / or shown separately in the drawings, can be used not only in the corresponding combinations but also in other combinations or individually. Attached Figure Description

[0014] The invention will now be described in more detail with the aid of preferred embodiments and reference to the accompanying drawings. In the drawings:

[0015] Figure 1 A partial schematic cross-sectional view of a high-voltage storage device for a motor vehicle is shown, wherein the high-voltage storage device includes a housing element on which a plurality of battery cells are held, and further wherein the high-voltage storage device includes at least one longitudinal beam by means of which the at least one housing element is stabilized and by means of which the high-voltage storage device can be fastened to the body of the motor vehicle, wherein the at least one longitudinal beam is an extruded profile having at least one longitudinal groove and / or milled portion and / or hole in a rated deformation region, by means of which the longitudinal groove and / or milled portion and / or hole can predetermine the rated deformation of the longitudinal beam when a force is applied laterally to the longitudinal beam;

[0016] Figure 2 A partial schematic cross-sectional view of a high-pressure storage device with longitudinal beams is shown, the longitudinal beams extending in their longitudinal direction along the longitudinal direction of a motor vehicle and having concave and / or convex cross sections in the rated deformation region, the concave and / or convex cross sections predetermining the rated deformation of the longitudinal beams when forces are applied laterally to the longitudinal beams.

[0017] Figure 3A partial schematic cross-sectional view of a high-voltage storage device with a longitudinal beam is shown. The longitudinal beam has at least one profile extending in its longitudinal extension direction along the longitudinal direction of the vehicle. The profile has a cross section that rises in the lateral direction of the vehicle and a cross section that sinks in the lateral direction of the vehicle in the rated deformation region. The rated deformation of the longitudinal beam when a force is applied laterally to the longitudinal beam is predetermined by the cross section that rises in the lateral direction of the vehicle and the cross section that sinks in the lateral direction of the vehicle.

[0018] Figure 4 A partial schematic cross-sectional view of a high-voltage storage device with a longitudinal beam is shown. The longitudinal beam has at least one profile extending longitudinally along the vehicle's longitudinal direction. This profile has a trapezoidal cross-section in the rated deformation region, the trapezoidal cross-section presupposing the rated deformation of the longitudinal beam when a force is applied laterally to it.

[0019] Figure 5 A partial schematic cross-sectional view of a high-voltage storage device with longitudinal beams is shown. The longitudinal beams have notches in the rated deformation region. The notches are pre-defined in the manufacturing process of the longitudinal beams and are used to predetermine the rated deformation of the longitudinal beams when forces are applied laterally to the longitudinal beams. Detailed Implementation

[0020] In the accompanying drawings, elements with the same function are assigned the same reference numerals.

[0021] exist Figures 1 to 5 A high-voltage storage device 1 is shown in partial cross-section. The high-voltage storage device 1 includes at least one housing element 2, on which a plurality of battery cells 3 of the high-voltage storage device 1 are held. Currently, the housing element 2 includes at least one base plate on which the plurality of battery cells 3 are disposed. Electrical energy can be stored in the battery cells 3, and the electrical energy can be supplied from the battery cells 3 to the electric drive of a motor vehicle having the high-voltage storage device 1. The high-voltage storage device 1 also includes at least one, currently exactly two, longitudinal beams 4, which are arranged on the sides of the plurality of battery cells 3 facing each other in the vehicle's lateral direction y. Currently, the high-voltage storage device 1 can be fastened to the vehicle body 5 by the corresponding longitudinal beams 4.

[0022] To minimize the risk of damage to the battery cell 3 in the high-voltage storage device 1 when a force is applied laterally to the longitudinal beam 4, the battery cell 3 is provided with a safe distance 6 along the distance direction 7 to the corresponding adjacent longitudinal beam 4. Currently, the distance direction 7 extends along the lateral direction y of the vehicle. Specifically, it is stipulated that the safe distance 6 is maintained between the longitudinal beam 4 and the corresponding adjacent battery cell 3, both when the longitudinal beam 4 is unloaded and when the longitudinal beam 4 is subjected to a force laterally along the distance direction 7.

[0023] Currently, the corresponding longitudinal beam 4 is configured as an extruded profile, which comprises a plurality of profiles 8 that are abutting each other, parallel to each other in their longitudinal extension direction, and oriented along the vehicle's longitudinal direction x. The profiles 8 are specifically configured to be hollow and have angular cross-sections. These cross-sections should be understood in particular as sections of the corresponding profile 8 formed by means of planes extending through the vehicle's height direction z and the vehicle's lateral direction y, wherein the corresponding cross-sections in... Figures 1 to 5 As shown in the diagram. To ensure a safe distance 6 is maintained when a force is applied to the longitudinal beam 4 from the outside along the distance direction 7, the longitudinal beam 4 has at least one rated deformation region 9. The rated deformation of the longitudinal beam 4 under the action of a force can be predetermined by constructing this rated deformation region. The deformation movement or direction of the longitudinal beam 4 when a force is applied laterally to the longitudinal beam 4 from the outside along the distance direction 7 can be predetermined by the corresponding geometry of the at least one rated deformation region 9 of the longitudinal beam 4.

[0024] To predetermine the rated deformation of longitudinal beam 4, such as Figure 1 As shown, the longitudinal beam 4 has a milled portion 10 and / or a longitudinal groove 11 in the rated deformation region 9. Alternatively or additionally, the longitudinal beam 4 has at least one hole in the rated deformation region 9, by means of which the rated deformation of the longitudinal beam 4 can be predetermined.

[0025] In the longitudinal beam 4 Figure 2 In the construction shown, at least one of the profiles 8 of the longitudinal beam 4 has a concave or convex cross-section. The concave or convex cross-section of the corresponding profile 8 of the longitudinal beam 4 should be understood as at least one defining sidewall 12 of the profile 8 being configured as convex or concave, thereby allowing the rated deformation of the longitudinal beam 4 to be predetermined particularly simply and accurately. In the longitudinal beam 4... Figure 3 The structural configuration shown specifies that at least one of the profiles 8 of the longitudinal beam 4 has a cross-section that rises or falls along the distance direction 7. The rising or falling cross-section of the profile 8 should be understood as follows: a sidewall defining the profile 8, further interior along the vehicle lateral direction y, is positioned above or below an outer sidewall opposite the interior sidewall in the vehicle height direction z, wherein the sidewalls respectively define the profile 8 laterally. Therefore, the corresponding sidewalls defining the profile 8 upward or downward along the vehicle height direction z are configured to rise or fall along the distance direction 7.

[0026] In the longitudinal beam Figure 4 In the structural configuration shown, the longitudinal beam 4 has at least one profile 8 with a trapezoidal cross-section. For the trapezoidal cross-section, at least two sidewalls defining the profile 8 on opposite sides are oriented obliquely to each other. Furthermore, the sidewalls defining the profile 8 on at least two opposite sides are configured to have different widths along the perimeter of the profile 8's cross-section. In the longitudinal beam 4... Figure 4 In the structural form shown, the longitudinal beam 4 has multiple profiles 8, each profile having a corresponding trapezoidal cross section, wherein the trapezoidal cross sections of different profiles 8 are constructed differently from each other.

[0027] In the longitudinal beam 4 Figure 5 The construction shown specifies that the longitudinal beam 4 has a gap 13 in the rated deformation zone 9. The gap 13 in the longitudinal beam 4 should be understood as remaining during the extrusion of the longitudinal beam 4 when it is manufactured as an extruded profile. This means that there is no profile 8 in the region of the gap 13 in the longitudinal beam 4. Here, the gap 13 is provided in the rated deformation zone 9. The gap 13 allows for particularly simple prediction of the deformation direction of the longitudinal beam 4 when a force is applied laterally from the outside along the distance direction 7. Here, the gap 13 can be specifically chosen such that the stability of the longitudinal beam 4 along the vehicle height direction z and along the vehicle longitudinal direction x is particularly high.

[0028] Specifically, a longitudinal beam 4 can be provided, the longitudinal beam having multiple rated deformation zones 9, wherein, when the multiple rated deformation zones 9 are provided, it is connected with... Figures 1 to 5 The different rated deformation regions 9 described in relation to each other can be combined.

[0029] The described high-voltage storage device 1 is based on the concept that the kinetic energy to be generated in a side-impact test is typically converted into deformation energy in the structure of the body-in-white 5 and / or the high-voltage storage device 1. To ensure sufficient safety of the high-voltage storage device 1 in a motor vehicle, the so-called "survival space" on the side of the battery cell 3 should not be damaged. An auxiliary parameter used to determine the lateral survival space of the battery cell 3 is the so-called dynamic distance of the high-voltage storage device 1. The dynamic distance describes the remaining distance of the high-voltage storage device 1 between the opposing longitudinal beams 4 in the lateral direction y of the vehicle. This auxiliary parameter of the dynamic distance is used to ensure the safety requirements regarding the high-voltage storage device 1 and should not be lowered. A safety distance 6 is predetermined by the dynamic distance. The survival space is predetermined by the safety distance 6.

[0030] As a result of the deformation energy, the geometric connections of the block assemblies and / or individual components on the body-in-white 5 and / or the high-voltage storage device 1 can also lead to errors in the accident deformation zone and thus make it impossible to maintain a safe distance 6, in connection with the corresponding deformation scheme.

[0031] To control the deformation direction and to avoid or mitigate blockage in the accident deformation zone of the high-voltage storage device 1, different solutions exist for constructing a particularly large dynamic distance for the longitudinal beam 4 when deformation occurs. The longitudinal beam 4 is currently configured as a multi-cavity profile with multiple profiles 8. The longitudinal beam 4 can be screwed onto the body-in-white 5, thereby holding the high-voltage storage device 1 onto the body-in-white 5.

[0032] In the rated deformation zone 9, longitudinal grooves 11 and / or milled portions 10 and / or holes, intended to weaken the profile, can be provided at different locations on the cross-section of the longitudinal beam 4, thereby enabling active control over the deformation direction of the longitudinal beam 4. This targeted profile weakening can be specifically provided only locally in blocky areas, such as particularly in areas of twisting points. By means of the localized milled portions and / or holes and / or gaps 13 on the longitudinal beam 4 of the high-pressure storage device 1, the sills of the longitudinal beam 4 and the body-in-white 5 can be rotated clockwise around the vehicle's longitudinal direction x, thereby achieving a particularly large dynamic distance.

[0033] Alternatively or additionally, as described, concave or convex profile shapes of the corresponding profile 8 and / or combinations of multiple concave and / or convex profile shapes at different positions on the cross-section of the longitudinal beam 4 can be provided in the corresponding rated deformation zone 9, thereby enabling active control of the deformation direction of the longitudinal beam 4. The concave and / or convex profile shapes can be particularly locally provided in blocky areas, especially in the areas of the twisting points.

[0034] Alternatively or additionally, descending or ascending geometries of the longitudinal beam 4, or combinations of multiple descending or ascending geometries at different locations on the cross-section of the longitudinal beam 4, can be provided in at least one rated deformation region 9, thereby enabling active control of the deformation direction of the longitudinal beam 4. The ascending and descending geometries are particularly provided in localized, blocky areas, especially in areas of the twisting points of the longitudinal beam 4's cross-section.

[0035] Furthermore, alternatively or additionally, a trapezoidal geometry of the cross-section of the longitudinal beam 4 can be provided in the corresponding rated deformation zone 9. In particular, multiple trapezoidal geometries of the longitudinal beam 4, which are different from each other, can be provided at different locations on the cross-section of the longitudinal beam 4, thereby enabling active control of the deformation direction of the longitudinal beam 4. In particular, the trapezoidal geometry of the cross-section of the longitudinal beam 4 can be provided in localized, blocky areas, especially in the areas of the twisting points.

[0036] Alternatively or additionally, in the at least one rated deformation zone 9, the gaps 13 of the extruded profile, particularly multiple gaps 13 of the extruded profile, can also be provided at different locations on the cross-section of the longitudinal beam 4, thereby enabling active control of the deformation direction. In particular, the at least one gap 13 can be provided in a blocky area of ​​the cross-section of the longitudinal beam 4, especially in the area of ​​the twisting point.

[0037] Therefore, the longitudinal beam 4, which is equipped with the high-pressure storage device 1, and especially the cavity structure of the longitudinal beam 4, are specifically designed to achieve active control of the deformation direction of the longitudinal beam 4. Additionally, this can avoid or at least reduce the clumping of components in the accident deformation zone, thereby improving or optimizing the dynamic distance.

[0038] In summary, this invention provides a method for optimizing high-voltage memory profiles to improve dynamic range.

[0039] List of reference numerals

[0040] 1. High-voltage storage device

[0041] 2. Housing components

[0042] 3 Battery Units

[0043] 4 Longitudinal beams

[0044] 5. Body-in-white

[0045] 6. Safe distance

[0046] 7. Distance and Direction

[0047] 8 profiles

[0048] 9. Rated Deformation Area

[0049] 10 Milling Section

[0050] 11 Longitudinal Groove

[0051] 12 sidewalls

[0052] 13 Gap

Claims

1. A high-voltage storage device (1) for a motor vehicle, the high-voltage storage device having a plurality of battery cells (3); having a housing element (2) on which the battery cells (3) are held; having at least one longitudinal beam (4) on which the housing element (2) is held and the longitudinal beam has a safe distance (6) to the battery cells (3) in a distance direction (7), Its features are, The longitudinal beam (4) has at least one rated deformation region (9), which, when a force is applied to the longitudinal beam (4) along the distance direction (7), can be predetermined by constructing the rated deformation region, thereby maintaining the safety distance (6). The longitudinal beam (4) has at least one profile (8) extending obliquely in the distance direction (7) in the rated deformation region (9), which has a concave cross section that bends downward and / or a convex cross section that bends upward, by means of the concave cross section and / or the convex cross section, by means of the concave cross section and / or the convex cross section, to determine the rated deformation.

2. The high-voltage storage device (1) according to claim 1, Its features are, The longitudinal beam (4) has at least one longitudinal groove (11) and / or milled portion (10) and / or hole in the rated deformation region (9) to predetermine the rated deformation by means of the longitudinal groove and / or milled portion and / or hole.

3. The high-voltage storage device (1) according to claim 1 or 2, Its features are, The profile (8) has a cross section that rises along the distance direction (7) and / or a cross section that falls along the distance direction (7), by means of the cross section that rises along the distance direction and / or a cross section that falls along the distance direction to predetermine the rated deformation.

4. The high-voltage storage device (1) according to claim 1 or 2, Its features are, The profile (8) has a trapezoidal cross section, by means of which the rated deformation is predetermined.

5. The high-voltage storage device (1) according to claim 1 or 2, Its features are, The longitudinal beam (4) is an extruded profile and has at least one gap (13) in the rated deformation area (9) by means of the gap to predetermine the rated deformation.

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