Hollow-chamber profile for fastening a battery module

Abstract

A hollow-chamber profile for fastening a battery module in a vehicle includes a first side wall and a second side wall which lies opposite the first side wall, where the first side wall and the second side wall are connected to one another via a bottom wall. Additionally, the hollow-chamber profile has a top wall which lies opposite the bottom wall, where the top wall is designed to interact with at least one fastening device for fastening the battery module. The hollow-chamber profile has at least one intermediate wall which extends between the side walls from the top wall in the direction of the bottom wall, where a wall thickness of the at least one intermediate wall is dimensioned in such a way that the fastening device can be introduced at least partially into the wall thickness of the at least one intermediate wall.

Claims

1. A hollow-chamber profile for fastening a battery module in a vehicle, comprising: a first side wall; a second side wall, wherein the second side wall is opposite from the first side wall; a bottom wall, wherein the first side wall and the second side wall are connected to each other via the bottom wall; a top wall, wherein the top wall is opposite from the bottom wall and wherein the top wall is configured to act in combination with a fastening device for fastening the battery module; and a first intermediate wall and a second intermediate wall, wherein the first intermediate wall and the second intermediate walls extend, between the first side wall and the second side wall, from the top wall toward the bottom wall, wherein the first intermediate wall and the second intermediate wall are spaced apart from each other to define a cavity, and wherein a fastening device is insertable at least partly into the cavity.

2. The hollow-chamber profile according to claim 1, wherein the fastening device is a screw or a bore.

3. The hollow-chamber profile according to claim 1, wherein the top wall has a first top-wall portion which is connected to the first side wall and to the first intermediate wall and wherein the top wall has a second top-wall portion which is connected to the second side wall and to the second intermediate wall.

4. The hollow-chamber profile according to claim 1 further comprising a stiffening-wall portion which extends from the first side wall to the first intermediate wall or from the second side wall to the second intermediate wall.

5. The hollow-chamber profile according to claim 4, wherein the first and second intermediate walls extend at least as far as the stiffening-wall portion and are connected to the stiffening wall portion.

6. The hollow-chamber profile according to claim 1, wherein a diameter (D) of the fastening device is greater than an inside width (B) of the cavity or the diameter (D) is greater than the inside width (B) of the cavity and respective wall thicknesses (W) of the first and second intermediate walls and wherein:
|(2W+B)−D|>0.5 mm.

7. The hollow-chamber profile according to claim 1, wherein the first and second intermediate walls have a height (H), wherein the fastening device has a diameter (D), and wherein H/D>2.

8. The hollow-chamber profile according to claim 1, wherein the hollow-chamber profile is an extruded press-drawn profile and/or an aluminum press-drawn profile.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic sectional view through a hollow-chamber profile according to a first exemplary embodiment of the present invention;

(2) FIG. 2 is a schematic sectional view through a hollow-chamber profile according to a second exemplary embodiment of the present invention; and

(3) FIG. 3 is a three-dimensional view of a hollow-chamber profile according to a third exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) In the following, parts that are the same are denoted by the same references.

(5) FIG. 1 shows a cross section through a hollow-chamber profile 1, in particular an extruded press-drawn profile 1, the hollow-chamber profile 1 having a first side wall 2 and a second side wall 4, which are connected to each other via a bottom wall 6. In addition, FIG. 1 shows that, provided opposite the bottom wall 6, there is a top wall 8, which likewise is connected to the side walls 2, 4.

(6) It can additionally be seen from FIG. 1 that the hollow-chamber profile 1 has an intermediate wall 12, which is connected to the top wall 8 and to a stiffening wall 16, which extends between the side wall 2 and the side wall 4. A substantially parallel alignment of the walls 2, 4, 12, or 6 and 16, in relation to each other is particularly advantageous.

(7) As an alternative or in addition to the stiffening wall 16 extending between the side walls 2, 4, there may also additionally be provided, between the intermediate wall 12 and the side walls 2 and 4, respectively, further stiffening-wall portions 16-1, 16-2, which may also extend obliquely, as is represented schematically.

(8) As is additionally shown by FIG. 1, the side walls 2, 4 and the bottom wall 6 realize a cavity 24, and the intermediate wall 12, the stiffening wall 16, the side walls 2, 4 and the top wall 8 form a respective cavity 26, 28, which cavities have the effect that the hollow-chamber profile 1 as a whole is realized as a very light component.

(9) As is further represented in FIG. 1, the wall thickness W of the intermediate wall 12 is dimensioned in such a manner that a fastening means 20 can be inserted into the intermediate wall 12 in order to fasten to the hollow-chamber profile 1 an element 22 that is to be fastened. The fastening means in this case may be a screw, which is screwed directly into the intermediate wall 12. It is also possible, however, that a thread or a bore is first realized in the intermediate wall 12, which thread or bore then, in turn, acts in combination with a screw or another type of fastening element. The intermediate wall 12 thus assumes the functions of the threaded bushing, such that it is possible to dispense with additional insertion of a bushing or nut.

(10) In order to provide a particularly good hold of the fastening means 20 in the intermediate wall 12, it is particularly preferred if a height H of the intermediate walls 12 is at least double, preferably three times, or a multiple of the diameter D of the fastening means 20. Owing to this height to diameter relationship, of H/D>2, it can be ensured that the fastening means is securely received in the intermediate wall 12 and that, even in the case of introduction of a large amount of force, pulling of the fastening means 20 out of the hollow-chamber profile 1, or damage to the profile, is reliably prevented.

(11) In addition, a diameter D of the fastening means 20 or of the bore may extend over the entire wall thickness W of the wall 12, so as to create a cavity that transitions into the cavities 26, 28 at the side of the intermediate wall 12. The diameter D of the fastening means 20 in this case may be selected, for example, so as to be up to 30% greater than the available wall thickness.

(12) Alternatively the fastening means 20, in particular the bore, or also the screw element, may be dimensioned in such a manner that the diameter D of the fastening means 20 is less than the wall thickness W of the intermediate wall 12. In particular, it is advantageous in this case if at least 15% of the original wall thickness W remains at the side of the fastening means 20 (wall thickness W.sub.2). An empirical minimum residual wall thickness is in the region of, for example, 0.5 mm. The anticipated forces can thereby still be absorbed, without the risk of pulling-out or breaking-out of the fastening means. Clearly, the wall thickness can be adapted to the anticipated load.

(13) FIG. 2 shows a further preferred exemplary embodiment, in which the hollow-chamber profile 1 has a first intermediate wall 12 and a second intermediate wall 14, which are connected to a first top-wall portion 8-1 and to a second top-wall portion 8-2, respectively. The first and the second intermediate wall 12, 14 in this case are opposite the side walls 2, 4 and each other. Again, particularly advantageous in this case is a substantially parallel alignment of the walls 2, 4, 12, 14 in relation to each other.

(14) In order to ensure the alignment, or the substantially parallel course of the intermediate walls 12, 14 in relation to the side walls 2, 4, and also in order that the intermediate walls 12, 14 do not buckle, even in the case of introduction of a large amount of force, the hollow-chamber profile 1 additionally has a first stiffening-wall portion 16-1 and a second-stiffening wall portion 16-2, which connect the first and the second intermediate wall 12, 14, respectively, to the associated first and second side wall 2, 4, respectively, and which are supported thereon. As represented in FIG. 2, the stiffening wall 16 may have two portions 16-1, 16-2, which connect the side walls 2, 4 to the respective intermediate walls 12, 14, but it is also possible to realize the stiffening wall 16, as shown in FIG. 1, as a continuous wall, which connects the two side walls 2, 4 to each other and to which the intermediate walls 12, 14 are joined. Likewise, it is possible for the stiffening-wall portions 16-1, 16-2 to run obliquely, or for further stiffening-wall portions to be provided, in particular supporting the intermediate walls 12, 14.

(15) As can be seen from FIG. 2, the two intermediate walls 12, 14 between them realize a slot 18, in to which, as represented in FIG. 2, the fastening means 20 can be inserted in order to fasten to the hollow-chamber profile 1 the element 22 to be fastened. This slot 18 may be open (in the case of two stiffening-wall portions) or closed off, in which case, for example, the stiffening wall 16 then forms a slot base.

(16) In the exemplary embodiment represented in FIG. 2, the fastening means 20 extends almost along the entire depth of the slot 18. It is also possible, however, that a longer fastening means is used, which extends into the cavity 24. In the case of an open slot 18, it can easily extend into the cavity 24. If, however, the slot 18 is closed off by the single-piece stiffening wall 16, openings, for example holes or bores, may be provided in the stiffening wall 16, or the slot base, which enable the fastening means 20 to pass through. Such an opening is represented, for example, in FIG. 3. However, the fastening means 20 may also be screwed directly into the stiffening wall 16, or into the slot base, or act in combination with it.

(17) In order to provide a particularly good hold of the fastening means 20 in the slot 18, in this exemplary embodiment, also, it is particularly preferred if the height H of the intermediate walls 12, 14 is at least twice, preferably three times, or a multiple of the diameter D of the fastening means 20. Owing to this height to diameter relationship, of H/D>2, it can be ensured that the fastening means is securely received in the slot and that, even in the case of introduction of a large amount of force, pulling of the fastening means 20 out of the hollow-chamber profile 1, or damage to the profile, is reliably prevented.

(18) As an alternative to the hollow-chamber profile represented in FIG. 2, in which only one slot 18 is provided for receiving the fastening means 20, the hollow-chamber profile 1 may also, as represented in FIG. 3, have a continuous top wall 8 and a continuous stiffening wall 16, such that the slot 18 is defined as a cavity closed off by the intermediate walls 12, 14, the stiffening wall 16 and the top wall 8. In order to fasten a fastening means to this hollow-chamber profile, the fastening means may be screwed directly through the top wall 8, for example by use of self-tapping screws, but it is also possible, as shown in FIG. 3, to retroactively make bores in the hollow-chamber profile 1, which extend as far as the stiffening wall 16 (blind-hole bore), or even through the stiffening wall 16.

(19) In addition, in a manner similar to the exemplary embodiment of FIG. 1, the diameter D of the bore may extend over the entire inside width B of the slot 18 and a thickness W of the walls 12, 14, such that a cavity 18 is created, which transitions into the cavities 26, 28 at the side of the intermediate walls 12, 14.

(20) Alternatively, the fastening means 20, in particular the bore, or also the screw element, may be dimensioned in such a manner that the diameter D of the fastening means 20 is greater than the inside width B of the slot 18, but is less than the sums of inside width of the slot and the wall thickness W of the intermediate wall. Thus, it is the case that B<D<(B+2W). As a result, the intermediate walls 12, 14 are not broken through, such that particularly good fixing of the fastening means 20 in the slot 18 is possible.

(21) In particular, it is advantageous in this case if only a slight portion of the wall thickness W of the side walls 12, 14 is overlapped by the fastening means, in particular the bore, or screw, such that, in the region of the fastening means, also, a sufficiently great wall thickness W.sub.2 of the intermediate walls 12, 14 remains. This is represented schematically in FIGS. 1 and 2, in which it can clearly be seen that the ratio between wall thickness W.sub.2, in the region of the fastening means, to wall thickness W, without fastening means, is such that sufficient wall material remains for good fastening, even in the case of introduction of a large amount of force. As a result, on the one hand, a particularly good and sufficient fastening of the fastening means in the slot can be provided. At the same time, however, there is sufficient material remaining at the side of the fastening means to prevent, for example, the intermediate wall 12, 14 from being broken through, and thus to prevent damage to the material. In this case, in particular, a minimum wall thickness, or projection of the fastening means, of approximately 0.5 mm is preferred. However, this may also be made thicker or thinner, according to the application and the anticipated introduction of force.

(22) Depending on the dimension of the profile and the design of the fastening means, an optimum can thus be set between available supporting fastening surface in the slot and the weight of the hollow-chamber profile, such that a cost and weight optimum of the fastening can be provided with minimal use of material.

(23) Overall, the design according to the invention of the press-drawn profile makes it possible to dispense with additional production steps, in particular producing and inserting threaded bushings, with the result that the costs for producing a fastening option for the battery module are significantly reduced. Furthermore, the extrusion profile according to the invention make it possible to achieve high component strength, with an equal or lesser weight, since there is no need for use of additional threaded bushings, and thus weakening of the material can be avoided. Furthermore, the component as a whole is greatly simplified. Thus, a lesser use of material and a lesser weight, and thus reduced costs, can be achieved by means of the press-drawn profile according to the invention.

(24) List of Reference Characters 1 hollow-chamber profile 2, 4 side wall 6 bottom wall 8 top wall 8-1, 8-2 top-wall portion 12, 14 intermediate wall 16 stiffening wall 16-1, 16-2 stiffening-wall portion 18 slot 20 fastening means 22 fastening element 24, 26, 28 cavity B inside width of the slot D diameter of the fastening means H height of the intermediate wall, or depth of the slot W intermediate-wall thickness W.sub.2 intermediate-wall thickness in the region of the fastening means

(25) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.